CN118719414A - A high-efficiency, energy-saving, clean paint spraying and baking room and intelligent ventilation method - Google Patents

Abstract

The present invention relates to the field of paint spraying and baking technology, specifically to a highly efficient and energy-saving clean paint spraying and baking room and an intelligent ventilation method, wherein the paint spraying and baking room comprises a paint spraying and baking room body and an air inlet system and an air outlet system arranged on the paint spraying and baking room body, wherein the paint spraying and baking room body is provided with an inlet and outlet for workpieces to enter and exit, wherein the air inlet system is arranged at the top of the paint spraying and baking room body and is used to achieve precise control of the clean quality, air volume and wind direction of the inlet air; wherein the air outlet system is arranged at the bottom of the paint spraying and baking room body and is used to achieve the clean quality and control of the outlet air. The present invention can achieve precise control of the inlet air flow and direction, greatly reduce the ineffective airflow in traditional extensive applications, reduce the ineffective wind resistance, significantly improve the particle interception efficiency, and at the same time greatly reverse the difficulty and installed scale of VOCs with low concentration and large air volume, greatly reduce the frequency of filter material replacement and labor intensity, and truly achieve high efficiency, energy saving and cleanliness.

Description

A high-efficiency, energy-saving, clean paint spraying and baking room and intelligent ventilation method

Technical Field

The invention relates to the technical field of paint spraying and baking, and in particular to a highly efficient, energy-saving, clean paint spraying and baking room and an intelligent ventilation method.

Background Art

The spraying and baking room, also called the spraying and baking room, is where the workpiece spraying and baking operations are completed. During the spraying and baking process, a large amount of excess paint mist particles and organic volatile gases will be generated. In order to ensure the continuous development of the process, it is usually necessary to introduce the atmosphere and mix with it to form an airflow, and then discharge it outdoors. If these airflows (including intake air and spraying exhaust gas) are not handled in time, it will not only affect the indoor clean environment and thus affect the spraying quality and even equipment safety, but also affect the health of operators in the spraying and baking room. If direct discharge is used, it often fails to meet the emission standards and causes air pollution.

According to relevant national environmental protection standards, all relevant spraying processes need to be restricted to a closed space (spraying and painting room). The key technology of advanced spraying and painting rooms is to fully discharge the above-mentioned spraying waste gas to the outside, and discharge it into the atmosphere after treatment to meet the standards. At the same time, it is necessary to take into account various indicators such as spraying product quality, occupational health, energy consumption, equipment efficiency, environmental protection standards, and comprehensive costs.

When the spraying exhaust gas is discharged outdoors, the total airflow and the flow rate on the working surface fluctuate greatly during a maintenance cycle due to the different degrees of blockage of the air intake and exhaust gas filtration. When the equipment has a low degree of filtration blockage, the airflow velocity is too high, which will affect the particle interception efficiency and the adsorption efficiency of organic waste gas; when the filtration blockage is high, the airflow velocity is too low, which will cause the particles to fail to leave the spraying surface quickly, affecting the spraying quality and environmental cleanliness. To ensure environmental protection and spraying quality, the only way is to increase the installed scale and shorten the maintenance cycle, which will increase investment and operating costs.

Comprehensively looking at the existing technologies, the exhaust gas from spraying is generally discharged outdoors by relying on traditional fans plus analog switches, which have a large inlet and outlet and have a lot of significant defects. The existing technical methods are single, simple to control, high energy consumption, low efficiency, difficult to guarantee the quality of spraying, high comprehensive investment, and high operating costs.

Comparison 1:

Taking the commonly used automobile repair spray paint room (7m long * 4m wide) as an example, according to the national "GB14444-2006 Spray Paint Room Safety Technical Regulations" and the transportation industry recommended standard "JT/T324-2022 Automobile Spray Paint Room", the horizontal plane of the work area controls the wind speed to 0.38-0.67m/s, and the middle value of 0.5m/s is taken for calculation. The indoor working clearance area is 21.8㎡, and the total ventilation volume is ^39240m3 /h. Under severe working conditions, the wind resistance of the top filter cotton is 500pa. Generally, the traditional configuration requires 2 double-inlet multi-wing built-in direct-connected centrifugal fans (single-unit performance parameters: 380V-7.5kw-5.6M-900r/min-815pa- ^20000m3 /h) as the air inlet fans, with a total operating power of 15kw, fully open and fully closed.

However, the current market situation is that in order to reduce investment costs, most products sacrifice air flow velocity and are calculated based on a controlled wind speed of 0.3m/s. At the same time, they are designed according to simple working conditions and are ultimately equipped with only one 7.5kw air inlet fan. Once the wind resistance of the top filter increases, the air flow velocity will drop significantly, and the paint mist in the paint spraying and baking room cannot be discharged in time, resulting in serious paint mist congestion. This deteriorates the indoor environmental quality, affects the smooth progress of the spraying work and product quality, and a large number of paint mist particles also adhere to the equipment and the surface of the air duct, increasing safety hazards and reducing equipment life.

Comparison 2:

The invention patent with application number 202211426954X discloses a new type of automatic accompanying delivery and emission environmentally friendly paint spraying room and its use method, including a paint spraying room, an air conditioning supply system, an infrared positioning control system, an air supply pipe, an exhaust pipe, an exhaust gas treatment system, an exhaust system and an electric control system. The air conditioning supply system can provide fresh air for the paint spraying room; the infrared positioning control system can monitor and locate the position signal of the worker's spraying operation in real time; the exhaust gas treatment system can purify the paint mist exhaust gas; the exhaust system can discharge the treated exhaust gas to high altitude; the electric control system can centrally control the air conditioning supply system, the infrared positioning control system, the exhaust gas treatment system and the exhaust system. It divides the paint spraying room into several independent partitions reasonably. When a worker is spraying in a certain partition, the air supply and exhaust systems of the partition where the worker is located are automatically turned on, and the air supply and exhaust systems of other partitions in the paint spraying room do not work, thereby reducing energy consumption.

However, through analyzing the above patent, it can be found that the patent has the following main defects:

1. Air supply system defects: Use one power source to ventilate each partition through the pipe valve. Take the commonly used automobile repair paint spraying room (7m long * 4m wide) as an example, refer to the requirements of relevant national standards and industry standards for wind speed. If there are 18 partitions, each partition is calculated at ^2400m3 /h. Normally, 18 pipes with a diameter of DN300mm or more are required. No matter how they are arranged, a huge confluence chamber is required. If 3 partitions need to be opened at the same time, the flow rate, flow rate and wind pressure of each partition are different. Spraying operations at the same time and at the same position will seriously affect the spraying process and spraying quality. Relevant air purification measures and wind uniformity measures are not mentioned.

According to the air duct design specification, except for straight pipes, pipes with a diameter of DN300mm or more cannot be made very short, and the pressure drop loss cannot be ignored. For a common automobile spray paint booth with a net height of 3.0m, the top confluence chamber and 18 pipes with a diameter of DN300mm or more must be at least 2m high, so the entire paint booth will be more than 5m high. Including the maintenance and repair space, a factory building with a net height of more than 6.5m is required to place such a paint booth, which will be limited in the installation of a large number of factories. Assuming an external air supply system, 18 pipes will be much longer, which is not economical in terms of safety, energy consumption loss, installation and maintenance convenience, and factory occupancy. This design faces similar defects regardless of the number of partitions. The fewer partitions there are, the larger the air volume required for each partition, the larger the corresponding pipe diameter, the larger the turning radius of the elbow, the longer the length, the larger the required air uniformity device, and the larger the entire volume. Moreover, this design is more difficult to meet the demand for more partitions. The more partitions there are, the more pipes there are. Although the pipe diameter is smaller, it is extremely difficult to arrange more pipes within the limited roof plane of the paint room.

2. Defects in the air outlet system: The air outlet system of this patent has no partitions and is considered to share one wind zone; no matter how the air outlet is designed and where it is placed, the corresponding position and distance between each air inlet partition and the air inlet partition will be unequal, and the corresponding dust reduction effect will be very different. Its dust reduction capacity is determined by the distance from the air outlet and whether it conforms to the direction of the gravity field, and it is even more difficult to achieve balanced air volume in all wind zones, not to mention balanced wind speed at each specific point. The defects in the air outlet system will offset the zoning effect of the air supply system, and ultimately lead to no fundamental difference between it and the traditional paint room. The cooperation of the two systems failed to achieve: controlling the direction of the airflow, controlling the plane wind speed balance, and reducing the air outlet speed to a level that is more conducive to filtering and dust removal.

3. Defects of infrared positioning control system: This patent uses infrared positioning to obtain signals from workers during spraying operations to decide to open the airflow of any partition. First, the airflow switching of each partition cannot be achieved in a short time. Affected by wind pressure and structural safety, both opening and closing must be performed slowly. Each rapid opening of a new air outlet may vibrate out the dust accumulated in the air duct. Secondly, if the airflow is not switched in time, it is difficult to ensure the continuity of spraying. The related airflow fluctuations will also affect the spraying quality. If the spraying operation is reciprocating across partitions, the wind zones will be frequently switched, which will make the operation impossible to carry out. Finally, the core of the entire ventilation system is to provide a uniform wind curtain that is sufficient to cover the working plane during the spraying operation, and to quickly carry away the rebounded excess paint mist particles at a suitable wind speed without contaminating the newly painted surface; the wind curtain should be centered on the paint mist particle rebound area rather than the worker's position, because when spraying, in order to prevent paint mist particles from splashing on the workers, the workers are actually the farthest from the paint mist particle rebound area; closely related to the paint mist particle rebound area and the quality of spraying effect is the position of the nozzle, and the position of the worker's spraying operation is not necessarily accurate; and the use of infrared to locate the position of the nozzle is also easily blocked by the human body and workpiece, so the positioning technology should also choose a more reliable method.

Summary of the invention

The purpose of the present invention is to provide an efficient, energy-saving, clean paint spraying and baking room and an intelligent ventilation method, which adopts an array-type air intake module to accurately divide and directionalize local air intake, so as to realize precise control of air intake flow rate and flow direction; greatly reduce the invalid airflow in traditional extensive applications, and the top air intake fan directly acts to reduce invalid wind resistance; the airflow constant speed and uniform speed design significantly improve the particle interception efficiency; adopt an array infrared heating component and an infrared array temperature sensor linkage control heating system, cooperate with an internal circulation convection system, and make full use of air convection and air infrared radiation heating technology to achieve precise temperature control, humidity control, flow rate control, and wind direction control, effectively improve the paint surface drying quality and drying efficiency while achieving safety and energy saving; at the same time, it greatly reverses the difficulty and installed scale of VOCs with low concentration and large air volume, greatly reduces the frequency of filter material replacement and labor intensity, and truly achieves high efficiency, energy saving and cleanliness.

To achieve the above object, the present invention provides the following technical solutions:

An efficient and energy-saving clean spray paint booth comprises a spray paint booth body and an air inlet system and an air outlet system arranged on the spray paint booth body, wherein the spray paint booth body is provided with an inlet and outlet for workpieces to enter and exit, the air inlet system is arranged at the top of the spray paint booth body and is used to achieve precise control of the air volume and wind direction of the air inlet; the air outlet system is arranged at the bottom of the spray paint booth body and is used to achieve air outlet control;

It also includes a drying system, which is used to heat and dry the paint surface of the workpiece;

It also includes a spraying waste gas treatment system arranged outside the spraying and painting booth body, and the spraying waste gas treatment system is used to treat the waste gas flowing out of the spraying and painting booth body;

It also includes a control system, which controls the air intake system, the air outlet system, the drying system, and the spraying waste gas treatment system respectively to achieve air intake and outlet switch control, air intake and outlet volume control, drying control, and waste gas treatment control.

Further, as a preferred technical solution, the air intake system includes an air intake cover and a plurality of air intake modules installed in the air intake cover and distributed in an array, the air intake cover is arranged on the top of the paint spraying and baking room body, the air intake cover is provided with a plurality of air inlets, and each of the air inlets is provided with a first filter device;

It also includes an outdoor atmosphere sensing device, which is arranged outside the air inlet cover.

Further, as a preferred technical solution, the air intake module includes an air intake fan, an air intake valve, an air uniformity device, a second filter device and a common indoor atmosphere sensing device, the air intake fan is arranged in the air intake channel of the air intake cover, the air intake valve is arranged in the air outlet channel of the air intake fan, and is used to realize the opening and closing of the air outlet of the air intake fan, the air uniformity device is arranged below the air intake valve, and is used to form a uniform wind speed, the second filter device is arranged below the air uniformity device, the second filter device includes a medium-efficiency filter body and a medium-efficiency filter body grid for fixing the medium-efficiency filter body below the air uniformity device, and the common indoor atmosphere sensing device is arranged in the paint spraying and baking room body;

The air inlet valve includes an air inlet valve plate, a first driving mechanism and a first valve plate position sensor. The air inlet valve plate is arranged at the air outlet of the air inlet fan. The displacement output end of the first driving mechanism is fixedly connected to the air inlet valve plate, and the air inlet valve plate realizes opening and closing of the air outlet of the air inlet fan under the action of the first driving mechanism. The first valve plate position sensor is used to detect the position state of the air inlet valve plate.

Furthermore, as a preferred technical solution, the air uniformity device includes an air splitter cone and a cross splitter frame, the cross splitter frame is arranged in the air outlet channel of the air inlet fan and below the air inlet valve, and the air splitter cone is arranged above the cross splitter frame.

Furthermore, as a preferred technical solution, the air outlet system includes an overhead working platform, a confluence chamber, an air outlet, and several air outlet modules. The overhead working platform is arranged at the bottom of the paint spraying and baking room body, and the confluence chamber is arranged below the overhead working platform. The confluence chamber is connected to the internal operating space of the paint spraying and baking room through each air outlet module, and the air outlet is used to introduce the exhaust gas in the confluence chamber into the spraying exhaust gas treatment system.

Furthermore, as an optimal technical solution, the air outlet module includes a bearing grille, a third filter device, a guide bucket and an air outlet valve. The bearing grille is arranged on an overhead working platform, the third filter device is arranged below the bearing grille, and the guide bucket is arranged below the third filter device. The air outlet valve includes an air outlet valve plate, a second driving mechanism and a second valve plate position sensor. The air outlet valve plate is arranged at the air outlet at the lower end of the guide bucket. The displacement output end of the second driving mechanism is fixedly connected to the air outlet valve plate and controls the air outlet valve plate to realize the opening and closing of the air outlet at the lower end of the guide bucket. The second valve plate position sensor is used to detect the position state of the air outlet valve plate.

Furthermore, as an optimal technical solution, the spray exhaust gas treatment system includes a fourth filter device, multiple groups of adsorption devices, multiple groups of adsorption fans, a desorption catalytic combustion device, a pre-treatment atmospheric sensing device and a main exhaust port, the fourth filter device is arranged in the air duct between the air outlet and the air inlet of the adsorption device, the adsorption device is connected to the desorption catalytic combustion device through a desorption pipe, the exhaust port of the desorption catalytic combustion device is connected to the main exhaust port, the adsorption fan is arranged in the air duct between the adsorption device and the main exhaust port, and the pre-treatment atmospheric sensing device is arranged in the air duct between the fourth filter device and the adsorption device.

Furthermore, as a preferred technical solution, the drying system includes a heating system and an internal circulation system for controlling air convection in the paint spraying and baking room, the heating system is arranged on the inner wall of the paint spraying and baking room body and can be positioned adjusted, and the internal circulation system is arranged on the inner side of the top of the paint spraying and baking room body.

Further, as a preferred technical solution, the heating system includes a plurality of heating plates, a movable heating plate support device and an infrared array temperature sensor, wherein the heating plate is composed of a plurality of infrared heating components distributed in an array and independently controllable, and the heating plate is movably hung on the inner wall of the paint spraying and baking room body through the movable heating plate support device, and heating and heating temperature control of different positions of the workpiece can be achieved by adjusting the position of the heating plate and controlling the on and off of different infrared heating components, and the infrared array temperature sensor is arranged on the heating plate to collect temperature data of the heated workpiece in real time;

The internal circulation convection system includes multiple groups of relatively arranged airflow injection devices, each group of airflow injection devices includes an internal circulation high-speed fan, an internal circulation air duct, an internal circulation air duct air inlet valve, a plurality of injection spherical air outlets and a temperature and humidity regulator. The internal circulation high-speed fan and the internal circulation air duct are both arranged on the top of the paint spraying and baking room body, the internal circulation air duct air inlet valve is arranged at the air outlet of the internal circulation high-speed fan, the injection spherical air outlet is arranged on the internal circulation air duct, the temperature and humidity regulator is arranged at the air inlet or air outlet of the internal circulation high-speed fan, and the air inlet of each group of the internal circulation high-speed fans is connected to the paint spraying and baking room body.

An efficient and energy-saving intelligent ventilation method for a clean spray paint booth comprises the following steps:

Step 1, work area setting: send the workpiece to be sprayed into the paint spraying and baking room, determine the specific position of the workpiece on the overhead work platform according to the current spraying task, set the corresponding air inlet module, and the system automatically matches the corresponding air outlet module;

Step 2, power-on self-test: according to the settings, gradually turn on the corresponding air inlet fan, adsorption fan and the corresponding air inlet valve and air outlet valve, and determine the real-time wind resistance level of the air inlet duct and air inlet filtration according to the pressure difference measured by the outdoor atmospheric sensing device and the shared indoor atmospheric sensing device. The system further determines the speed of each fan of the air inlet module under the standard working condition to obtain the corresponding flow rate; according to the pressure difference measured by the shared indoor atmospheric sensing device and the pre-treated atmospheric sensing device, determine the real-time wind resistance level of the air outlet duct, air outlet and exhaust gas treatment filtration. The system further determines the speed of the adsorption fan under the standard working condition to obtain the flow rate matching the air inlet, until the pressure difference reaches the system default optimal value, the power-on self-test is completed, and the system stores the running program after the self-test correction for use at the next power-on;

Step 3, start the operation: open the target program stored in the self-test, and the corresponding air intake fan and adsorption fan are started. External air enters through the air inlet on the air inlet hood, and is filtered by the first filter device to remove entanglements. Then, it is passed through the uniform air device and the second filter device to obtain a clean uniform airflow, which is sent to the indoor spraying work area; the clean uniform airflow moves downward to form a mixed airflow with the spraying exhaust gas, and the mixed airflow passes through the overhead working platform and is filtered by the third filter device to remove most of the particulate matter in the spraying exhaust gas. The remaining mixed air flows into the spraying exhaust gas treatment system through the air outlet; the mixed airflow entering the spraying exhaust gas treatment system first passes through the fourth filter device to remove most of the particulate matter in the spraying exhaust gas, and then is transported to the adsorption device to remove most of the VOCs gas in the spraying exhaust gas to form a qualified gas, and then is pressurized and exhausted to the main exhaust port by the adsorption fan, and finally discharged into the atmosphere through the chimney.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention changes the traditional extensive unified air intake into an array-type precisely divided directional local air intake, which subverts the existing extensive application. The external circulation inlet and outlet air used to carry away the residual particles and VOCs in the spraying process is precisely controlled in terms of flow and direction, which greatly reduces the ineffective wind flow in extensive applications, greatly reduces the ineffective wind resistance, and significantly improves the particle interception efficiency. At the same time, it greatly reverses the difficulty and installed scale of VOCs treatment with low concentration and large air volume, greatly reduces the frequency of filter material replacement and labor intensity, and greatly improves the cleanliness level of the paint spraying and paint baking room. It is a truly efficient and energy-saving innovation.

(2) The present invention fully utilizes air convection and air radiation heating technologies by designing a heating system and an internal circulation convection system, and utilizes a heating control system that links an array infrared heating component with an infrared array temperature sensor to achieve precise temperature control, humidity control, flow rate control, and wind direction control, thereby effectively improving the paint surface drying quality and drying efficiency while achieving safety and energy saving.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the overall structure of the present invention;

FIG2 is a schematic structural diagram of an air intake system of the present invention;

FIG3 is a schematic structural diagram of an air outlet system of the present invention;

FIG4 is a schematic structural diagram of a spraying waste gas treatment system according to the present invention;

FIG5 is a schematic structural diagram of a drying system of the present invention;

FIG6 is an air inlet and outlet path of the present invention;

Figure 7 shows the air inlet and outlet paths of the existing patented technical solution (202211426954X);

Figure 8 shows the air inlet and outlet paths of a traditional paint room.

The names corresponding to the marks in the accompanying drawings are: 1. Paint spraying and baking room body, 2. Air intake system, 3. Air outlet system, 4. Drying system, 5. Control system, 6. Spraying exhaust gas treatment system, 13. Inlet and outlet, 21. Air inlet hood, 22. Air inlet module, 23. Air inlet, 31. Overhead working platform, 32. Confluence chamber, 33. Air outlet, 34. Air outlet module, 41. Heating system, 42. Internal circulation system, 61. Fourth filter device, 62. Adsorption device, 63. Adsorption fan, 64. Desorption catalytic combustion device, 65. Total exhaust port, 212. Air intake primary filter cotton, 213. Air intake primary filter screen, 221. Air intake fan, 222. Air intake valve, 223. Wind uniformity device, 224. Second filter device, 34 1. Carrying grille, 342. Third filtering device, 343. Guide bucket, 344. Air outlet valve, 411. Heating plate, 412. Mobile heating plate supporting device, 413. Infrared array temperature sensor, 421. Internal circulation high-speed fan, 422. Internal circulation air duct, 423. Air inlet valve of internal circulation air duct, 424. Jet spherical air outlet, 425. Temperature and humidity regulator, 2221. Air inlet valve plate, 2222. First driving mechanism, 2223. First valve plate position sensor, 2231. Air distribution cone, 2232. Cross diversion rack, 2241. Medium efficiency filter body, 2242. Medium efficiency filter cotton mesh rack, 3441. Air outlet valve plate, 3442. Second driving mechanism, 3443. Second valve plate position sensor.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

As shown in FIG1 , a highly efficient and energy-saving clean paint spraying and baking room comprises a paint spraying and baking room body 1 and an air inlet system 2 and an air outlet system 3 arranged on the paint spraying and baking room body 1. The paint spraying and baking room body 1 is provided with an inlet and outlet 13 for workpieces to enter and exit. The air inlet system 2 is arranged at the top of the paint spraying and baking room body 1 and is used to achieve precise control of the air volume and wind direction of the air inlet; the air outlet system 3 is arranged at the bottom of the paint spraying and baking room body 1 and is used to achieve air outlet control;

This embodiment also includes a drying system 4, which is used to heat and dry the paint surface of the workpiece;

This embodiment further includes a spraying waste gas treatment system 6 disposed outside the spraying and painting booth body 1, and the spraying waste gas treatment system 6 is used to treat the waste gas flowing out of the spraying and painting booth body 1;

This embodiment also includes a control system 5, which controls the air intake system 2, the air outlet system 3, the drying system 4, and the spraying waste gas treatment system 6 respectively to achieve air intake and outlet switch control, air intake and outlet volume control, drying control, and waste gas treatment control. It should be noted that the control system includes necessary electrical components, control circuits (chips), and control programs. It is easy for those skilled in the art to select appropriate electrical components, control circuits (chips), and control programs based on their understanding of the structural composition and working principle of the present invention, so the specific structure and control principle of the control system will not be described in detail here.

As shown in Figure 2, the air intake system 2 of this embodiment includes an air intake hood 21 and a plurality of air intake modules 22 installed in the air intake hood 21 and distributed in an array. The air intake hood 21 is arranged on the top of the paint spraying and paint baking room body 1. The air intake hood 21 is provided with a plurality of air inlets 23. Each air inlet 23 is provided with a first filtering device. The first filtering device is preferably composed of an air intake primary filter cotton 212 and an air intake primary filter screen 213. The air intake primary filter screen 213 is installed at the air intake hood 23, and the air intake primary filter cotton 212 is installed on the air intake primary filter screen 213.

This embodiment also includes an outdoor atmospheric sensing device (not shown in the figure), which is arranged outside the air inlet cover 21. Preferably, the outdoor atmospheric sensing device of this embodiment includes an air pressure sensor, a temperature and humidity sensor, and a particle sensor/PM1.0-2.5-10, which are used to obtain the current atmospheric pressure, temperature and humidity, particle parameters, etc. It should be noted that the position of the outdoor atmospheric sensing device outside the air inlet cover 21 is not limited, as long as the current atmospheric pressure, temperature and humidity, particle parameters, etc. can be collected in real time.

As shown in FIG. 2 , the air inlet module 22 of the present embodiment includes an air inlet fan 221, an air inlet valve 222, an air uniforming device 223, a second filtering device 224, and a common indoor atmosphere sensing device (not shown in the figure). The air inlet fan 221 is arranged in the air inlet channel of the air inlet cover 21, and the air inlet valve 222 is arranged in the air outlet channel of the air inlet fan 221 to realize the opening and closing of the air outlet of the air inlet fan 221. The air uniforming device 223 is arranged below the air inlet valve 222 to form a uniform wind speed. The filter device 224 is arranged below the uniform wind device 223, the second filter device 224 includes a medium-efficiency filter body 2241 and a medium-efficiency filter body frame 2242 for fixing the medium-efficiency filter body 2241 below the uniform wind device 223, and the common indoor atmosphere sensing device is arranged in the spray paint room body 1, and the common indoor atmosphere sensing device includes an air pressure sensor, a temperature and humidity sensor, and a particle sensor/PM1.0-2.5-10, which is used to obtain the pressure, temperature and humidity, and particle parameters in the spray paint room. The medium-efficiency filter body 2241 of this embodiment preferably adopts a three-dimensional spray glue filter cotton, which is a common medium-efficiency filter structure. Its specific structure and working principle are very easy to obtain and know to those skilled in the art, so it will not be repeated here.

As shown in Figure 2, the air inlet valve 222 of this embodiment includes an air inlet valve plate 2221, a first driving mechanism 2222 and a first valve plate position sensor 2223. The air inlet valve plate 2221 is arranged at the air outlet of the air inlet fan 221. The displacement output end of the first driving mechanism 2222 is fixedly connected to the air inlet valve plate 2221, and the air inlet valve plate 2221 realizes the opening and closing of the air outlet of the air inlet fan 221 under the action of the first driving mechanism 2222. The first valve plate position sensor 2223 is used to detect the position state of the air inlet valve plate 2221.

The wind uniforming device 223 of this embodiment includes an air splitting cone 2231 and a cross splitting frame 2232 . The cross splitting frame 2232 is arranged in the air outlet channel of the air inlet fan 221 and below the air inlet valve 222 . The air splitting cone 2231 is arranged above the cross splitting frame 2232 .

In this embodiment, the air inlet hood 21 is placed on the top of the paint spraying and baking room body 1 to form a closed roof, and a number of air inlet modules are distributed in the air inlet hood 21 in an array. The air inlet hood 21 reserves a number of inspection doors and vents connected to the atmosphere with coarse filtration. The air inlet of each air inlet module 22 is connected to the vent of the air inlet hood 21, and the air outlet of each air inlet module 22 is connected to the paint spraying and baking room body 1, and all non-connected parts are sealed. The atmosphere passes through the coarse filtration of the primary air filter cotton 212 and the primary air filter screen 213 in the air inlet hood 21 to remove entanglements and large particles, enters the fan for pressurization to form a wind flow, and passes through the opened air inlet valve plate 2221. At this time, columnar wind is formed. After entering the uniform air device, the columnar wind passes downward through the wind splitter cone 2231, and is diverted from the center to the surroundings by the wind splitter cone 2231, and then is cut by the cross diverter frame 2232, and then turbulent wind is formed under the constraint of the uniform air device casing. Finally, it is blocked and filtered by the second filter device 224 to form a clean rectangular plane uniform speed wind that meets the filtration level, and then enters the working surface of the paint spraying and baking room.

As shown in Figure 3, the air outlet system 3 of this embodiment includes an overhead working platform 31, a confluence chamber 32, an air outlet 33, and a plurality of air outlet modules 34. The overhead working platform 31 is arranged at the bottom of the paint spraying and baking room body 1, and the confluence chamber 32 is arranged below the overhead working platform 31. The confluence chamber 32 is connected to the internal operating space of the paint spraying and baking room through each air outlet module 34. The air outlet 33 is used to introduce the exhaust gas in the confluence chamber 32 into the spraying exhaust gas treatment system 6.

Specifically, the air outlet module 34 of this embodiment includes a supporting grille 341, a third filter device 342, a guide bucket 343 and an air outlet valve 344. The supporting grille 341 is arranged on the overhead working platform 31, the third filter device 342 is arranged below the supporting grille 341, the guide bucket 343 is arranged below the third filter device 342, and the air outlet valve 344 includes an air outlet valve plate 3441, a second driving mechanism 3442 and a second valve plate position sensor 3443. The air outlet valve plate 3441 is arranged at the lower air outlet of the guide bucket 343, the displacement output end of the second driving mechanism 3442 is fixedly connected to the air outlet valve plate 3441 and controls the air outlet valve plate 3441 to realize the opening and closing of the air outlet at the lower end of the guide bucket 343, and the second valve plate position sensor 3443 is used to detect the position state of the air outlet valve plate 3441.

It should be noted that the first driving mechanism and the second driving mechanism of this embodiment can be implemented by using common cylinders, and of course they can also be driven by motors. In terms of reliability and stability, it is preferred to use cylinders as the first driving mechanism and the second driving mechanism.

The air outlet module of the present invention mainly ensures that the incoming air passes through the spraying working surface along the gravity field direction, becomes spraying waste gas and enters the preset air outlet module, uses the minimum flow rate to minimize the diffusion of spraying waste gas, and uses the third filter device 342 to efficiently intercept spraying particles, because the smaller and more uniform the flow rate, the higher the filtering and interception efficiency, and the less likely the filter material is to be penetrated. Because the uneven exhaust gas flow will cause some areas of the filter material to be penetrated early, while other areas cannot be used, which wastes materials and fails to achieve the interception effect. Therefore, the present invention can effectively improve the service life of the filter material and enhance the interception reliability.

As shown in FIG4 , the spraying waste gas treatment system 6 of this embodiment includes a fourth filter device 61, multiple groups of adsorption devices 62, multiple groups of adsorption fans 63, a desorption catalytic combustion device 64, a pre-treated atmospheric sensing device (not shown in the figure) and a total exhaust port 65. The fourth filter device 61 is arranged in the air duct between the air outlet 33 and the air inlet of the adsorption device 62. The adsorption device 62 is connected to the desorption catalytic combustion device 64 through a desorption pipeline. The exhaust port of the desorption catalytic combustion device 64 is connected to the total exhaust port 65. The adsorption fan 63 is arranged in the air duct between the adsorption device 62 and the total exhaust port 65. The pre-treated atmospheric sensing device is arranged in the air duct between the fourth filter device 61 and the adsorption device 62. The pre-treated atmospheric sensing device includes an air pressure sensor, a temperature and humidity sensor, and a particle sensor/PM1.0-2.5-10, which are used to obtain the pressure, temperature and humidity, and particle parameters of the airflow entering the adsorption device 62.

In this embodiment, during the spraying stage of the paint spraying and baking room, the workpiece is placed at a preset position on the working platform, and the air inlet module at the corresponding position is turned on. Clean air is blown vertically downward at a uniform speed from the top of the paint spraying and baking room, passing through the spraying working surface of the workpiece, and quickly taking away the overflowing paint mist particles. The airflow passes through the bearing grille on the overhead working platform below the workpiece, continues downward, and enters the corresponding air outlet module. The third filter device intercepts the spray particles, and the remaining spray exhaust gas enters the confluence chamber along the guide bucket; the confluent spray exhaust gas enters the spray exhaust gas treatment system connected to it through the air outlet, and after the fourth filter device of the spray exhaust gas treatment system is filtered again, it is adsorbed to obtain the standard treated gas, and finally it can be directly discharged through the main exhaust port. In addition, after the adsorption is saturated, the adsorption operation is stopped, and the adsorption equipment is discharged after desorption catalytic combustion, so that the adsorption equipment is regenerated and put back into adsorption use.

As shown in Figure 5, the drying system 4 of this embodiment includes a heating system 41 and an internal circulation system 42 for controlling air convection in the paint spraying and paint baking room. The heating system 41 is arranged on the inner wall of the paint spraying and paint baking room body 1 and can be positioned adjusted. The internal circulation system 42 is arranged on the inner side of the top of the paint spraying and paint baking room body 1.

Specifically, the heating system 41 of the present embodiment includes a plurality of heating plates 411, a mobile heating plate support device 412 and an infrared array temperature sensor 413. The heating plate 411 is composed of a plurality of infrared heating components 4111 distributed in an array and independently controllable. The heating plate 411 is movably hung on the inner wall of the spray paint and baking room body 1 through the mobile heating plate support device 412. By adjusting the position of the heating plate 411 and the on-off control of different infrared heating components, the heating and heating temperature control of different positions of the workpiece can be achieved. The infrared array temperature sensor 413 is arranged on the heating plate 411 to collect the temperature data of the heated workpiece in real time. In the present embodiment, the heating plate 411 preferably adopts a graphene heating plate. The graphene heating plate itself is an existing structure, and its specific structural composition and working principle are easy to obtain and know to those skilled in the art, so it will not be repeated here.

The internal circulation convection system 42 of the present embodiment includes a plurality of groups of relatively arranged airflow injection devices, each group of airflow injection devices includes an internal circulation high-speed fan 421, an internal circulation air duct 422, an internal circulation air duct air inlet valve 423, a plurality of injection spherical air outlets 424 and a temperature and humidity regulator 425. The internal circulation high-speed fan 421 and the internal circulation air duct 422 are both arranged on the top of the paint spraying and baking room body, the internal circulation air duct air inlet valve 423 is arranged at the air outlet of the internal circulation high-speed fan 421, the injection spherical air outlet 424 is arranged on the internal circulation air duct 422, and the temperature and humidity regulator 425 is arranged at the air inlet or air outlet of the internal circulation high-speed fan 421. The air inlet of each group of internal circulation high-speed fans 421 is connected to the paint spraying and baking room body 1, so that the inlet and outlet of the convection system are both indoors, avoiding increasing the burden of air filtration and temperature and humidity regulation.

In this embodiment, the spray paint room needs a matching drying process in the leveling and drying stages. The present invention makes full use of air convection and air radiation heating technology, and especially utilizes the heating control technology of the array infrared heating component and the infrared array temperature sensor linkage, so as to achieve accurate temperature control, humidity control, flow rate control, and wind direction control, effectively improving the paint surface drying quality and drying efficiency while achieving safety and energy saving. In the paint surface leveling stage, it is necessary to keep the paint surface moist, so that countless paint mist particles can flow under tension and merge into the coating film, making it smoother. Then it is necessary to stabilize this fluidity, so this time should not be too long. In the middle, it is necessary to moisturize and not dry intensely, and finally achieve the surface drying (or flash drying) effect to proceed to the next process. In this process stage, the convection system humidity control system needs to be started, and the direction of the spray spherical air outlet is manually adjusted appropriately, supplemented by wind speed control, so that the air humidity is controlled in an appropriate range; in order to prevent the indoor air from being affected by the climate throughout the year in the paint surface leveling stage, the temperature, humidity, and convection flow rate performance curves need to be matched in a moderate range through the control system, so that the paint surface is leveled to ensure quality and efficiency. When the room temperature is low and the humidity is high, the flow rate can be increased. When the room temperature is low and the humidity is not high, the flow rate can be appropriately reduced. When the room temperature is high and the humidity is high, the flow rate can be appropriately increased. When the room temperature is high and the humidity is not high, the humidity can be appropriately increased, and so on.

After the paint surface is dry, it can be further dried thoroughly, or other effect coatings can be added and the leveling and drying process can be circulated. To completely dry the paint surface after it is dry, it is necessary to turn on the radiation heating mode of the temperature control system and turn on the convection system at the same time. In order to control the drying quality, thorough drying is not achieved overnight, but a gradual process, with the temperature increasing from low to high and the total amount of heat radiation received increasing from small to large. Since the heated object is not a uniform plane, in order to prevent local overheating and excessive temperature difference from causing microscopic damage to the paint surface, an infrared array temperature sensor is used to monitor the temperature of thousands of points on the heated surface corresponding to each heating plate, and all the monitored points are divided into several temperature zones, each temperature zone corresponds to the infrared heating components distributed in an array on the heating plate and is controlled in a linkage manner. The infrared array temperature sensor is used to sense the changes in the temperature zones of the heated workpiece in real time to control the corresponding infrared heating components distributed in an array on the heating plate, and finally realize the arbitrary control of the temperature control system on the temperature zones of radiation heating. It can prevent the local temperature from being too high, and simulate the total amount of heat received through the curve changes of temperature and time, so as to deduce the degree of drying, prevent insufficient drying or over-drying, and improve energy efficiency while strictly controlling the film quality of the coating. The cooperation between the heating system and the internal circulation convection system further improves the drying efficiency while reducing the energy consumption level.

The drying principle of the present invention is as follows: the infrared heat radiation wave of the heating plate passes through the paint film to reach the surface of the workpiece substrate, and then reflects back. The energy is absorbed by the substances in the paint film, and the thermal shock of the solvent or water molecules is intensified, which accelerates the separation from the paint film (and also accelerates the overall cross-linking reaction of the paint film), allowing the solvent or water molecules to be precipitated to reach the surface of the paint film, and further evaporate from the paint film to the nearby air; at this time, the air humidity (or solvent vapor pressure) on the surface of the paint film and near the surface of the paint film is high, which will reduce the evaporation rate of water (or solvent). If assisted by high-speed air convection, these water (or solvent) will leave quickly to speed up the drying efficiency. If the air humidity of the internal circulation convection system is close to saturation, dehumidification is required to increase the overall water absorption capacity of the indoor air.

The internal circulation convection system can appropriately reduce the upper limit temperature of heating. Because these high-temperature gases are full of a large amount of organic volatile waste gas, in order to ensure safety, the concentration needs to be controlled at 1/4 of the lower limit of explosion. For this reason, it is necessary to regularly send these high-temperature and high-concentration waste gases to the waste gas treatment facilities at the back end for adsorption. However, the existing technology cannot handle these high-temperature gases at all. Not only can it not be adsorbed, but it also causes the originally adsorbed waste gas to be desorbed, resulting in serious emissions exceeding the standard. At the same time, the amount of normal temperature gas must be introduced according to the amount of high-temperature gas discharged. The higher the upper limit temperature of heating, the higher the heat loss. Therefore, it is better to use more convection technology to avoid the above unfavorable factors. And to achieve the same drying effect, this is something that pure radiation heating cannot do. Otherwise, only the external circulation can be turned on to reduce the saturation of the air, but this will lose a lot of heat (especially in low temperature periods). In addition, the application of lowering the upper limit temperature of heating and infrared array temperature sensors can completely eliminate fire hazards (in the past, fire accidents in which traditional baking lamps ignited spray masking materials often occurred).

The specific working process of the control system of this embodiment is as follows:

Control of the air intake system: Before starting to spray, the control system obtains the air pressure difference data measured by the outdoor atmospheric sensing device and the shared indoor atmospheric sensing device during the power-on self-test process, and controls the speed of the air intake fan according to the air pressure difference data to ensure that the air pressure in the paint spraying and baking room is relatively balanced. The control system can control the switch and speed of the air intake fan and the air intake valve to realize the control of the air intake switch and the air intake air volume.

Control of the air outlet system: The control system can control the air outlet valves of each air outlet module to achieve on-off control of different air outlets, thereby ensuring that the air inlet and outlet correspond to each other.

Control of the drying system: The control system controls the position of the heating plate to achieve radiation heating and drying of the paint surface at the corresponding position of the sprayed workpiece, and controls the heating temperature of each infrared heating component on the heating plate by acquiring the temperature data collected by the infrared array temperature sensor; while the paint surface of the workpiece is drying, the control system can start the internal circulation high-speed fan and control the wind speed of the internal circulation high-speed fan according to the drying requirements. In addition, the control system can control the temperature and humidity regulator to adjust the temperature and humidity in the paint spraying and baking room according to the temperature and humidity data measured by the shared indoor atmospheric sensing device, so as to control the air temperature and humidity in the paint spraying and baking room within an appropriate range.

Control of the spray exhaust gas treatment system: The control system obtains the pressure difference data measured by the indoor common atmospheric sensing device and the pre-treated atmospheric sensing device, and controls the on and off and speed of the adsorption fan according to the pressure difference data to ensure the relative balance of the air pressure in the paint spraying and baking room. The control system also controls the adsorption device and the desorption catalytic combustion device. When the adsorption device is saturated with adsorption, the control system sends a desorption control instruction to the adsorption device, and the adsorption device starts desorption and sends the desorbed gas to the desorption catalytic combustion device for treatment.

This embodiment provides an efficient and energy-saving intelligent ventilation method for a clean paint spraying and baking room, comprising the following steps:

An efficient and energy-saving intelligent ventilation method for a clean spray paint booth comprises the following steps:

Step 1, work area setting: send the workpiece to be sprayed into the paint spraying and baking room, determine the specific position of the workpiece on the overhead work platform 31 according to the current spraying task, set the corresponding air inlet module 22, and the system automatically matches the corresponding air outlet module 34;

Step 2, power-on self-test: according to the settings, gradually turn on the corresponding air inlet fan 221, adsorption fan 63 and the corresponding air inlet valve 222, air outlet valve 344, and determine the real-time wind resistance level of the air inlet duct and the air inlet filter according to the pressure difference measured by the outdoor atmospheric sensing device and the shared indoor atmospheric sensing device. The system further determines the speed of each fan of the air inlet module under the standard working condition to obtain the corresponding flow rate; according to the pressure difference measured by the shared indoor atmospheric sensing device and the pre-treated atmospheric sensing device, determine the real-time wind resistance level of the air outlet duct, the air outlet and the exhaust gas treatment filter, and the system further determines the speed of the adsorption fan under the standard working condition to obtain the flow rate matching the air inlet, until the pressure difference reaches the system default optimal value, the power-on self-test is completed, and the system stores the running program after the self-test correction to be used at the next power-on;

Step 3, start the machine and run: open the target program stored in the self-test, and the corresponding air intake fan 221 and adsorption fan 63 are started to work. External air enters through the air inlet 23 on the air inlet cover 21, and is filtered by the air intake primary filter cotton 212 and the air intake primary filter screen 213 to remove the entanglement, and then passes through the air uniformity device 223 and the second filter device 224 to obtain a clean uniform airflow, which is sent to the indoor spraying work area; the clean uniform airflow moves downward to form a mixed airflow with the spraying exhaust gas, and the mixed airflow passes through the overhead working platform 31, and is filtered by the third filter device 342 to remove most of the particulate matter in the spraying exhaust gas, and the remaining mixed air flows through the air outlet 33 into the spraying exhaust gas treatment system 6; the mixed airflow entering the spraying exhaust gas treatment system 6 first passes through the fourth filter device 61 to remove most of the particulate matter in the spraying exhaust gas, and then is transported to the adsorption device 62 to remove most of the VOCs gas in the spraying exhaust gas to form a qualified gas, and then is pressurized and exhausted to the main exhaust port 65 by the adsorption fan 63, and finally discharged into the atmosphere through the chimney.

It should be noted that the wind pressure and flow rate of the fan are closely related to the fan speed, and the degree of correlation is reflected in the performance curve. When writing the system operation program, it is necessary to refer to the performance curve. Of course, this is easy to implement for those skilled in the art, so the specific process will not be repeated.

In the above method, you can also set up multi-task power-on self-tests. For example, when a spraying task involves multiple spraying work surfaces, you may need to set up multiple air inlet modules and air outlet guide modules. Each set of settings requires power-on self-tests. A set of configured power-on self-test parameters can be used continuously when the pressure difference fluctuates slightly (for example, set to <50pa). Once the pressure difference is too large, the system will prompt you to re-self-test to match the corresponding fan operating parameters. If it involves a long-term continuous spraying operation at a fixed position, the system can automatically adjust the fan operating parameters to match the appropriate flow rate based on the detected pressure difference fluctuations.

In the above method, when spraying of one panel surface is completed and another panel surface needs to be sprayed, the operating system needs to switch to a pre-stored target program (or open several target programs at the same time, and determine to open the corresponding specific target program according to the automatic tracking position of the nozzle, and realize the switching between several target programs. The relevant automatic tracking technology is a prior art and will not be described in detail). At this time, the fans and valves of the previous group of programs gradually reduce the speed until they are closed, and the fans and valves of the latter group of programs gradually increase the speed until they reach the set speed; during the switching process, the system will realize the fastest switching in the shortest time according to the pressure difference fluctuation level.

It should be noted that, in order to obtain the ideal paint film thickness and visual effect during high-quality spraying, it is necessary to control the spray width, round-trip speed and distance of the nozzle within a unit time, so that the leveling of the coatings covered by two adjacent sprayings is not affected; and in order to enhance the uniformity and stability of the artificial sprayed paint film, the round-trip distance of the nozzle is suitable for the sprayer not to move, change hands or stretch his arms; at the same time, in order to avoid the difference in paint film reflection caused by the spraying technique, the lateral dimensions of the spraying surface should not be too large. For this reason, a large number of products are physically divided into large-scale spray products on a visual surface during design. Therefore, the surface covering of any large product will be designed to be composed of several small pieces suitable for spraying; and each small piece will be completed separately at one time during spraying to ensure the high consistency of color, visual effect, etc. within a single piece, and the relative consistency of color, visual effect, etc. between pieces. Therefore, the air inlet and outlet system and intelligent ventilation method of the present invention are so necessary for high-quality spraying.

The above method can also realize equipment maintenance reminder. The equipment can be turned on and self-checked regularly during idle time. The filter pressure difference of each air inlet module and the filter pressure difference of each exhaust gas treatment unit can be measured. According to the preset limit, an early warning reminder is set. When the preset extreme value is exceeded (the preset extreme value cannot be modified), the corresponding module (air inlet module and/or air outlet module) will be locked (only self-check can be turned on) and cannot be officially operated until it is repaired or replaced and the measured value of the power-on self-check meets the standard before it can be used. For example, if the filter pressure difference of the air inlet module is measured to be greater than the preset limit value, it means that the second filter device has reached the filter saturation state and needs to be replaced for normal use. Similarly, the filtration pressure difference involved in the spray exhaust gas treatment system is also based on the same principle. The filtration pressure difference comes from the pressure difference measured by the outdoor atmospheric sensing device, the shared indoor atmospheric sensing device, and the atmospheric sensing device after pretreatment. This truly achieves automatic reminders for equipment maintenance without the need for regular maintenance, especially for consumables such as filtering devices. Since each air inlet module or air outlet module is not always in the on state, the working time and degree of blockage of each corresponding filtering device are different, and it is impossible to use regular estimates to repair or replace the filtering device. The present invention solves this problem well by measuring the filtration pressure difference, allowing the filtering device to work to its limit state to the maximum extent without working in a saturated state, ensuring normal and stable filtration, and lower replacement and maintenance costs.

In addition, the present invention performs real-time detection of the air pressure at various positions through an outdoor atmospheric sensing device, a shared indoor atmospheric sensing device, and a pre-treated atmospheric sensing device, and controls the rotation speed of the air inlet fan and the adsorption fan to keep the inlet and outlet air volumes as constant as possible. In this way, the air pressure in the paint spraying and baking room can be kept relatively constant, thereby preventing the room structure, air duct, etc. from being deformed, damaged, or even leaking due to pressure imbalance to form unorganized emissions, thereby avoiding affecting the normal operation of the paint spraying and baking room and the service life of the paint spraying and baking room.

As shown in Figures 6-8, Figure 6 is the air inlet and outlet paths of the present invention, Figure 7 is the air inlet and outlet paths of the existing patent technology solution (202211426954X), and Figure 8 is the air inlet and outlet paths of a traditional paint room. By comparison, it can be found that in terms of air intake, the present invention obtains a more uniform air intake under the action of the air intake module and the uniform air device, and can achieve precise control of the flow rate and direction of the air intake; and in terms of air outlet, the present invention can use the air outlet module to leave the spraying work area in the optimal path, and can minimize the diffusion of spraying exhaust gas at a relatively smaller flow rate, prevent contamination of the workpiece or work area during the air outlet process, and the smaller and more uniform the air outlet flow rate, the less likely the filter material is to be penetrated, so that the filter device can obtain a higher filtering interception efficiency. Although the air inlet path of the existing patented technical solution (202211426954X) is controlled, the air outlet path is not controlled; the air inlet and outlet paths of the traditional paint room are not controlled; the airflow with uncontrolled paths is concentrated on the shortest route, so that the large working area that needs the airflow to pass through is not covered, and the spraying exhaust gas generated is not easily carried away, and the small part of the shortest route where the airflow is concentrated has a flow rate that is too high and cannot be intercepted by particulate matter.

The present invention can provide clean and stable airflow with constant speed and relatively constant pressure without damaging the room structure (causing spray exhaust gas to escape and drip), eliminate unorganized emissions, and ensure that each fan is not overloaded to increase service life, improve equipment stability, eliminate hidden dangers of environmental violations, and reduce equipment maintenance costs; ensure that the particle emission concentration is not congested indoors and does not exceed the standard outdoors at any time, thereby reducing the cost of particle pollution control; eliminate invalid flow (no useless work), reduce invalid wind resistance, make full use of filter materials to improve particle interception efficiency, and reduce material costs; significantly improve energy consumption utilization and reduce energy consumption costs.

Compared with the traditional paint spraying and baking room, the present invention has the following advantages:

Reference: General Motors repair paint spray booth is 7m long and 4m wide; Reference standard: The national "GB14444-2006 Paint Spray Booth Safety Technical Regulations" and the transportation industry recommended standard "JT/T324-2022 Automobile Spray Paint Booth" stipulate that the horizontal plane control wind speed in the working area is 0.38-0.67m/s, and the middle value 0.5m/s is taken for calculation; the indoor working clearance area is 21.8㎡, the total ventilation volume is ^39240m3 /h, and the top filter cotton wind resistance is 500pa under severe working conditions. Generally, the traditional configuration requires 2 double-inlet multi-wing built-in direct-connected centrifugal fans (single-machine performance parameters: 380V-7.5kw-5.6M--900r/min-815pa- ^20000m3 /h), with a total operating power of 15kw, fully open and fully closed.

According to the specific process characteristics of the target spraying object, the present invention divides the spraying operation surface of the common passenger car repair spray paint room (7m long * 4m wide) into 6*3=18 matrix-arranged air inlet zones, corresponding to 6*2+2=14 matrix-arranged air outlet zones, and any combination of 3 air inlet zones (ventilation area 2.8㎡) is designed to cover any car body spraying panel. For each panel to be sprayed, only one corresponding partition combination of air inlet system and linked air outlet system is opened. In this way, only 2.8*0.5*3600= ^5040m3 /h ventilation flow is required, and if calculated according to the maximum limit, only 2.8*0.67*3600= ^6754m3 /h is required. Still based on the calculation of 500pa wind resistance of the top filter cotton under severe working conditions, it is necessary to configure 3 corresponding EC fans (single machine performance parameters: 230V-500W-355-1020pa- ^3900m3 /h). The total installed power is 1.5kw during one operation, which can be controlled arbitrarily through the control system. The actual energy consumption is between 48-84% according to the degree of wind resistance, that is, 0.72-1.26kw.

Comparing the two, from the perspective of energy consumption, the air intake system of the present invention consumes 1.26/15=8.4% of the energy of traditional products, which is more than ten times, reaching an order of magnitude, and the control method is also changed from analog to fully digital. The reliability, intelligent management, noise level, safety level and cleanliness level of the entire air intake system are significantly improved.

The present invention adopts real-time data collection, power-on self-check application, accurate matching of inlet array fan switch, outlet array valve switch, inlet and outlet fan performance curve and digital online closed-loop control in the intelligent control system of ventilation system; controls the wind direction, quality, coverage, flow rate and uniformity of fresh air on the indoor working surface, and controls the wind direction, flow rate, uniformity, particle interception rate and particle concentration of the air outlet under the indoor working surface; protects the overall structure of the paint room, over-limit temperature protection, fan overload protection, filter material overload warning, over-limit protection of waste gas generation, treatment and emission; combines infrared radiation heating and high-speed wind convection, and is mainly based on temperature and humidity adjustment. High-efficiency energy-saving drying system, infrared array temperature sensor and infrared radiation heating array heating linkage control application, etc. All of the above technologies have not been involved in the reference.

Ventilation and exhaust gas treatment:

Reference: General Motors repair spray paint room is 7m long and 4m wide, with a maximum ventilation volume of ^39240m3 /h. Under severe working conditions, the ventilation volume is about ^30000m3 /h. The fluctuation of air volume is affected by the blockage of air inlet cotton, top filter cotton, paint mist filter cotton at the air outlet, medium-efficiency filter material for exhaust gas treatment, adsorbent, etc. in a maintenance cycle. The total amount of VOCs pollution per unit time of spray paint (solvent-based) is affected by the working area and process type (primer two coats + leveling + drying; mid-coat two coats + leveling + drying; color paint or metallic paint two coats + leveling + varnish two coats + leveling + drying), and the difference is huge. Based on many years of actual measurement experience, we usually take the total amount of VOCs of 360000mg of working paint used for a complete operation of an auto repair panel as an example. These VOCs are discharged in the form of exhaust gas after thorough drying, but they are not released only in one process flow. They are even hidden in the exhaust gas particles and intercepted by the filter material and slowly evaporated. These VOCs waste gases must pass through the paint room's back-end spray waste gas treatment system and can only be discharged into the atmosphere after being treated to meet the standards. So from the spraying process, as long as the paint room exhaust system is turned on, the amount of air entering must be exhausted, and the waste gas treatment system must also treat the same amount of air. However, due to the influence of the process, the concentration of VOCs waste gas is sometimes high, sometimes low, and sometimes intermittent, showing the characteristics of large air volume, low concentration and great fluctuations, which makes the waste gas treatment more technically difficult.

If the painting operation of a car repair panel is completed within 2 hours, excluding the interval, leveling, drying, waiting and other time, the actual time to open the paint room exhaust system is only more than 30 minutes. According to the severe working conditions, the total air volume is only ^15,000m3 , and the average concentration is 360,000mg/15,000m3 = 24mg/ ^m3 . However, about 40% of the exhaust gas is released after drying, which is discharged at 15% of the ventilation volume. At this time, the exhaust gas VOCs concentration will reach more than 6 times the average concentration, about 160mg/ ^{m3 ,} which is far beyond the emission requirements. If multiple panels are operated at one time, due to the accumulation and release effect of the exhaust gas paint mist particles, the peak concentration of exhaust gas VOCs will be pushed up to about 300mg/ ^m3 . According to environmental protection requirements, even if most of the paint is replaced with water-based paint, varnish is still required. The VOCs concentration of the exhaust gas from a single panel surface is about 100 mg/ ^m3 , and the peak concentration of VOCs in the exhaust gas accumulated on multiple panels will reach about 180 mg/ ^m3 .

The present invention controls the wind by partitioning, and only one partition combination is always opened at the same time during the spraying operation. The total ventilation flow rate designed each time is maintained within a range (through the fan linkage closed-loop control, the output power is reduced when the wind resistance of the ventilation system is small, and the output power is increased under severe working conditions). For example, in a general automobile repair spray paint room with the same operation task, only ^7000m3 /h effective flow rate is designed, and the corresponding average concentration is 102mg/ ^m3 . When drying, the ventilation volume is 30%, about 350mg/ ^m3 , and the peak concentration of VOCs in the waste gas accumulated on multiple plates will also reach about 630mg/ ^m3 . This concentration level is still within the treatment range of existing conventional technologies. Compared with VOCs waste gas with larger air volume and lower concentration (large air volume means large absolute water content in the air. Since water molecules have a competitive advantage in adsorption, for the same total amount of VOCs, the total amount of adsorbed water is large when the air volume is large, and the desorption energy consumption is higher, and the overall work efficiency is lower), the unit efficiency of the treatment is higher.

By comparing the above data, it can be found that the ventilation unit flow rate of the present invention is only 7000/30000=23% (about 1/4) of the traditional product to complete the same or even higher quality work requirements with the same large working space, the installed scale of VOCs waste gas treatment is only 1/4 of it, the air intake energy consumption level is only about 1/12, and the VOCs waste gas treatment emission energy consumption is about 1/3; the total energy consumption of the ventilation system (including adsorption and desorption) is only 30% of the traditional product, which truly achieves high efficiency and low energy consumption.

The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims (10)

1. A highly efficient and energy-saving clean paint spraying and baking room, characterized in that it comprises a paint spraying and baking room body (1) and an air inlet system (2) and an air outlet system (3) arranged on the paint spraying and baking room body (1), wherein the paint spraying and baking room body (1) is provided with an inlet and outlet (13) for workpieces to enter and exit, the air inlet system (2) is arranged at the top of the paint spraying and baking room body (1) and is used to achieve precise control of the air volume and wind direction of the air inlet; the air outlet system (3) is arranged at the bottom of the paint spraying and baking room body (1) and is used to achieve air outlet control; It also includes a drying system (4), which is used to heat and dry the paint surface of the workpiece; It also includes a spraying waste gas treatment system (6) arranged outside the spraying and painting booth body (1), wherein the spraying waste gas treatment system (6) is used to treat waste gas flowing out of the spraying and painting booth body (1); The system also includes a control system (5), which controls the air inlet system (2), the air outlet system (3), the drying system (4), and the spraying waste gas treatment system (6) respectively, so as to realize air inlet and outlet switch control, air inlet and outlet volume control, drying control, and waste gas treatment control. 2. According to claim 1, a high-efficiency, energy-saving and clean paint spraying and baking room, characterized in that: the air intake system (2) includes an air intake cover (21) and a plurality of air intake modules (22) installed in the air intake cover (21) and distributed in an array, the air intake cover (21) is arranged on the top of the paint spraying and baking room body (1), the air intake cover (21) is provided with a plurality of air inlets (23), and each of the air inlets (23) is provided with a first filtering device; It also comprises an outdoor atmosphere sensing device, wherein the outdoor atmosphere sensing device is arranged outside the air inlet cover (21). 3. A high-efficiency, energy-saving, clean paint spraying and baking room according to claim 2, characterized in that: the air inlet module (22) comprises an air inlet fan (221), an air inlet valve (222), an air uniformity device (223), a second filtering device (224) and a common indoor atmosphere sensing device, the air inlet fan (221) is arranged in the air inlet channel of the air inlet cover (21), and the air inlet valve (222) is arranged in the air outlet channel of the air inlet fan (221), so as to realize the air inlet fan (221) The air outlet is opened and closed, the uniform wind device (223) is arranged below the air inlet valve (222) for forming uniform wind, the second filter device (224) is arranged below the uniform wind device (223), the second filter device (224) comprises a medium-efficiency filter body (2241) and a medium-efficiency filter body frame (2242) for fixing the medium-efficiency filter body (2241) below the uniform wind device (223), and the common indoor atmosphere sensing device is arranged in the paint spraying and baking room body (1); The air inlet valve (222) comprises an air inlet valve plate (2221), a first driving mechanism (2222) and a first valve plate position sensor (2223); the air inlet valve plate (2221) is arranged at the air outlet of the air inlet fan (221); the displacement output end of the first driving mechanism (2222) is fixedly connected to the air inlet valve plate (2221); and the air inlet valve plate (2221) realizes opening and closing of the air outlet of the air inlet fan (221) under the action of the first driving mechanism (2222); and the first valve plate position sensor (2223) is used to detect the position state of the air inlet valve plate (2221). 4. According to claim 3, a high-efficiency, energy-saving, clean paint spraying and baking room is characterized in that: the air uniformity device (223) includes an air distribution cone (2231) and a cross diverter frame (2232), the cross diverter frame (2232) is arranged in the air outlet channel of the air inlet fan (221) and is located below the air inlet valve (222), and the air distribution cone (2231) is arranged above the cross diverter frame (2232). 5. According to claim 1, a high-efficiency, energy-saving and clean paint spraying and baking room is characterized in that: the air outlet system (3) includes an overhead working platform (31), a confluence chamber (32), an air outlet (33), and a plurality of air outlet modules (34); the overhead working platform (31) is arranged at the bottom of the paint spraying and baking room body (1); the confluence chamber (32) is arranged below the overhead working platform (31); the confluence chamber (32) is connected to the internal operating space of the paint spraying and baking room through each air outlet module (34); the air outlet (33) is used to introduce the exhaust gas in the confluence chamber (32) into the spraying exhaust gas treatment system (6). 6. A high-efficiency, energy-saving, clean paint spraying and baking room according to claim 5, characterized in that: the air outlet module (34) comprises a bearing grille (341), a third filter device (342), a guide hopper (343) and an air outlet valve (344), the bearing grille (341) is arranged on the overhead working platform (31), the third filter device (342) is arranged below the bearing grille (341), the guide hopper (343) is arranged below the third filter device (342), and the air outlet valve (344) is arranged below the third filter device (342). ) comprises an air outlet valve plate (3441), a second driving mechanism (3442) and a second valve plate position sensor (3443); the air outlet valve plate (3441) is arranged at the air outlet at the lower end of the guide bucket (343); the displacement output end of the second driving mechanism (3442) is fixedly connected to the air outlet valve plate (3441) and controls the air outlet valve plate (3441) to realize the opening and closing of the air outlet at the lower end of the guide bucket (343); the second valve plate position sensor (3443) is used to detect the position state of the air outlet valve plate (3441). 7. According to claim 1, a high-efficiency, energy-saving and clean paint spraying and baking room is characterized in that: the spraying waste gas treatment system (6) includes a fourth filter device (61), multiple groups of adsorption devices (62), multiple groups of adsorption fans (63), a desorption catalytic combustion device (64), a pre-treatment atmospheric sensing device and a main exhaust port (65), the fourth filter device (61) is arranged in the air duct between the air outlet (33) and the air inlet of the adsorption device (62), the adsorption device (62) and the desorption catalytic combustion device (64) are connected through a desorption pipeline, the exhaust port of the desorption catalytic combustion device (64) is connected to the main exhaust port (65), the adsorption fan (63) is arranged in the air duct between the adsorption device (62) and the main exhaust port (65), and the pre-treatment atmospheric sensing device is arranged in the air duct between the fourth filter device (61) and the adsorption device (62). 8. According to claim 1, a high-efficiency, energy-saving and clean paint spraying and baking room is characterized in that: the drying system (4) includes a heating system (41) and an internal circulation system (42) for controlling air convection in the paint spraying and baking room, the heating system (41) is arranged on the inner wall of the paint spraying and baking room body (1) and can be adjusted in position, and the internal circulation system (42) is arranged on the inner side of the top of the paint spraying and baking room body (1). 9. According to claim 1, a high-efficiency, energy-saving and clean paint spraying and baking room, characterized in that: the heating system (41) comprises a plurality of heating plates (411), a movable heating plate supporting device (412) and an infrared array temperature sensor (413), the heating plate (411) is composed of a plurality of infrared heating components (4111) distributed in an array and independently controllable, the heating plate (411) is movably hung on the inner wall of the paint spraying and baking room body (1) through the movable heating plate supporting device (412), and heating and heating temperature control of different positions of the workpiece can be achieved by adjusting the position of the heating plate (411) and controlling the on and off of different infrared heating components, and the infrared array temperature sensor (413) is arranged on the heating plate (411) to collect temperature data of the heated workpiece in real time; The internal circulation convection system (42) comprises a plurality of groups of relatively arranged airflow injection devices, each group of airflow injection devices comprises an internal circulation high-speed fan (421), an internal circulation air duct (422), an internal circulation air duct air inlet valve (423), a plurality of injection spherical air outlets (424) and a temperature and humidity regulator (425); the internal circulation high-speed fan (421) and the internal circulation air duct (422) are both arranged on the top of the paint spraying and baking room body; the internal circulation air duct air inlet valve (423) is arranged at the air outlet of the internal circulation high-speed fan (421); the injection spherical air outlet (424) is arranged on the internal circulation air duct (422); the temperature and humidity regulator (425) is arranged at the air inlet or the air outlet of the internal circulation high-speed fan (421); and the air inlet of each group of the internal circulation high-speed fans (421) is connected to the paint spraying and baking room body (1). 10. An efficient and energy-saving intelligent ventilation method for a clean paint spraying and baking room, characterized by comprising the following steps: Step 1, setting the working area: send the workpiece to be sprayed into the paint spraying and baking room, determine the specific position of the workpiece on the overhead working platform (31) according to the current spraying task, set the corresponding air inlet module (22), and the system automatically matches the corresponding air outlet module (34); Step 2, power-on self-test: according to the settings, the corresponding air inlet fan (221), adsorption fan (63) and the corresponding air inlet valve (222) and air outlet valve (344) are gradually turned on, and the real-time wind resistance level of the air inlet duct and the air inlet filter is determined according to the pressure difference measured by the outdoor atmospheric sensing device and the shared indoor atmospheric sensing device. The system further determines the speed of each fan of the air inlet module under the standard working condition to obtain the corresponding flow rate; according to the pressure difference measured by the shared indoor atmospheric sensing device and the pre-treated atmospheric sensing device, the real-time wind resistance level of the air outlet duct, the air outlet and the exhaust gas treatment filter is determined. The system further determines the speed of the adsorption fan under the standard working condition to obtain the flow rate matching the air inlet, until the pressure difference reaches the system default optimal value, the power-on self-test is completed, and the system stores the running program after the self-test correction to be used at the next power-on; Step 3, start the machine and run: open the target program stored in the self-test, and start the corresponding air intake fan (221) and adsorption fan (63). External air enters through the air inlet (23) on the air intake cover (21), and is filtered by the first filter device to remove entanglements. Then, clean uniform airflow is obtained through the air uniformity device (223) and the second filter device (224), and is sent to the indoor spraying work area; the clean uniform airflow moves downward to form a mixed airflow with the spraying exhaust gas, and the mixed airflow passes through the overhead working platform (31) and passes through the third filter. The filter device (342) filters and removes most of the particulate matter in the spraying waste gas, and the remaining mixed gas flows through the air outlet (33) into the spraying waste gas treatment system (6); the mixed gas entering the spraying waste gas treatment system (6) first passes through the fourth filter device (61) to remove most of the particulate matter in the spraying waste gas, and then is transported to the adsorption device (62) to remove most of the VOCs gas in the spraying waste gas to form a qualified gas, and then is pressurized and exhausted to the main exhaust port (65) through the adsorption fan (63), and finally discharged into the atmosphere through the chimney.