JPS5858589B2 - drying system - Google Patents

Description

[Detailed Description of the Invention] Summary of the Invention The present invention provides a system for drying objects coated with volatile paint, such as automobiles, by transferring them from a setting zone to a convection zone to prevent paint defects from occurring. This invention relates to a drying system that prevents noxious exhaust from being emitted in the radiant zone such as the dark red zone.In particular, the exhaust system uses a direct combustion system and a setting seam/convection zone is used to control the radiant zone. This invention relates to a drying system equipped with a circulation circuit.

<Prior Art> Conventionally, automobiles and other objects that have been painted undergo a drying process. In general, a drying system in which a painted automobile as an object to be dried passes through and is dried is shown in a schematic side view in Fig. 1. There was an embodiment as disclosed in Japanese Utility Model Publication No. 47-34951.

That is, the car (not shown) is set in setting zone 1 after painting.
After being cured at room temperature, volatile components are discharged from the system through a duct 3 by an exhaust fan 2, and the vehicle is transferred to a dark red zone 4, which serves as a radiation zone. Due to the heat radiation, we try to avoid painting defects such as soot adhesion due to direct hot air blowing as much as possible.

The heat panel 5 sucks outside air from outside the system through the filter 7 by the suction fan 6, is heated by the burner 8, circulates through the internal circulation circuit 9, heats the heat panel, and emits heat radiation. Only the amount of air used for combustion in the burner 8 is exhausted from the system again through the duct 11 by the exhaust fan 10.

However, in the dark red sea 74, the direct heat rays of radiation do not reach the paint sag and the lower skirt part, and therefore it is difficult to dry, so a bypass circuit 12 is provided from the circulation circuit 9 of the heat panel 5 to A large number of blowing nozzles 13 are installed at the lower part of the vehicle, and the hot air inside the heat panel 5 is blown from below to the skirt part of the automobile for forced blowing drying, and the hot air after being blown is appropriately discharged 14.

<Problems with the Prior Art> In this case, the hot air from the spray nozzle 13 was discharged to the outside of the yarn from the exhaust air 14 as it was together with the furnace gas containing HC generated during the drying process of the paint.

Therefore, heat energy is discharged together with the exhaust air, resulting in an extremely large loss as a system.

On the other hand, as pollution problems such as air pollution have increased in recent years, the amount of emissions from continuous drying of automobiles has become a drawback that cannot be ignored from that point of view.

Although it is possible to use an afterburner or a catalyst to deal with this problem, the disadvantages are that the equipment is expensive and the running costs are high.

Furthermore, there are also disadvantages such as difficulty in maintenance.

<Purpose of the Invention> The purpose of the present invention is to solve the problems of the drying system based on the above-mentioned conventional technology, and to solve the problem by directly burning the exhaust gas system in addition to the closed circuit circulation system to remove HC government gas from the system. It is an object of the present invention to provide an excellent drying system that is useful for drying applications in the manufacturing industry by preventing waste from being discharged and reducing the running cost of after-treatment equipment.

<Structure of the Invention> In order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned object and has the gist of the above-mentioned claims, is to solve the above-mentioned problems when an object to be dried coated with paint, such as an automobile, enters the radiation zone from the setting zone. The HC-3 gas-containing exhaust air generated in the setting zone and the subsequent convection zone is sent to the setting zone and the convection zone from a suction circuit branched to the setting zone and the convection zone, and then sent to the upper radiant exhaust air via a changeover switch. Direct combustion is carried out by sucking it into a heat panel circulation direct combustion burner with a duct, converting it into a non-polluting gas and discharging it outside the system.

In addition, in the radiation zone between the two zones, the drying gas is circulated in a closed circuit to prevent the generation of HC3-containing gas from the entire drying system, and the material to be dried is moved to the next convection zone. The measures taken were as follows.

<Operation of the Embodiment> Next, an embodiment of the present invention will be described below based on FIG. 2.

Components that are the same as those in FIG. 1 are given the same reference numerals.

Reference numeral 1 denotes a setting zone where objects to be dried such as automobiles coated with paint are transported and cured, and a duct 3 having an exhaust fan 2 is provided at the upper part.

Reference numeral 4 denotes a dark red zone as a radiation zone, and a row of heat panels 5, 5, which are appropriately partitioned by air curtains AJ, are arranged in the nosetting sea 71, and the heat panels 5 are equipped with a suction fan. The suction circuits 19 and 20 branched and connected via the 6° switching valve 21 face the duct 3 and the convection sea 718 (described later) to suck inside air, circulate hot air from the burner 8 to the internal circulation circuit 9, and suck the air. The amount is discharged out of the system through an exhaust duct 11 by a fan 10.

The pipe 14 of the spray circuit, which has a large number of upward spray nozzles 13 in the lower part of the tunnel-shaped furnace in the dark red zone 4, has a circulation fan 15, and a heater 16 is interposed in the middle, and the pipe 14 is connected to the upper part of the furnace. A closed circuit is formed by facing the suction port 17.

A convection zone 18 is connected to the dark red zone 4 via an air curtain B as appropriate.

<Operations of the Embodiment> In the above-described configuration, the object to be dried (not shown), such as a painted automobile, first comes to the setting seam 71 and is cured, and the volatile components dried at room temperature are discharged from the duct 3 by the exhaust fan 2. Exhausted from the system.

The object to be dried, which is slowly transported as a primary process, reaches the dark red zone 4.

In the dark red zone 4, the setting zone 1 is set by the operation of the suction fan 6. Alternatively, the air inside the convection zone 18 is sucked through the switching valve 21 from the suction circuits 19 and 20 facing each other.

The setting zone 1. Alternatively, harmful components such as HC among paint evaporation components generated in the convection seam 718 are incinerated by the direct combustion type vanina 8 to make them pollution-free, and the heat panel 5 is heated via the circulation circuit 9. ,
Only the amount of suction is exhausted from the duct 11 to the outside of the system without any pollution by the fan 10.

Similarly, the suction circuits 19 and 20 can be selectively opened and closed by the switching valve 21 depending on the type of object to be dried, the state of coating, and the drying situation.

Then, the heated heat panel 5 radiates and heats the middle and upper sides of the object to be dried to provide a drying effect.

Therefore, since the circulation circuit 14 is a closed circuit, neither HC nor gaseous gases are dissipated out of the system.

On the other hand, since the temperature inside the furnace in dark red zone 4 has been increased,
The hot air staying in the upper part of the furnace is sucked through the upper suction port 17 by the circulation fan 15, and when it is desired to further raise the temperature, the heater 16 is activated to heat the air and pass through the pipe 14.
A large number of spray nozzles 13 at the lower part of the circulation circuit also spray onto the lower part of the object to be dried, and the object is dried by preventing the paint from dripping and the shadow areas at the lower part, which are difficult to dry, and is sucked and circulated again from the suction port 17.

Therefore, the circulation circuit is connected to the suction port 17. Heater 16° Fan 15. Nozzle 13. Configures a closed circuit with the inside of the furnace.

Even if HC"B-containing gas is generated, the HC gas will not go out of the system, and as long as this occurs, there is no risk of Q such as air pollution.

Of course, it is also possible to interpose a catalyst device or the like as appropriate in the pipes of the circulation circuit 14.

Further, the heater 16 may be used as appropriate.

The object to be dried, which has been dried by the dark red sea 74, is transferred to the convection zone 18 through the air curtain B.

<Effects of the Invention> As described above, according to the present invention, in the radiation zone of the drying process moving from the setting zone to the convection zone, the heated airflow of the upper radiation heat panel is made into a circuit via a direct combustion mechanism, As a result, even when suction is carried out from outside the yarn, HC and the like are burned by the direct combustion mechanism, resulting in a non-polluting effect and being discharged outside the system without polluting the environment.

Further, a suction circuit is connected to the setting zone or the convection zone, and the evaporated HC and gaseous components in the setting zone and the convection zone are sucked and burned, thereby removing all HC and gaseous components from the exhaust gas. Not only is this possible, but the excellent effect is that the heat generated by combustion can be used effectively.

In addition, since the suction circuit is provided with a changeover switch, it is possible to switch to a selected song depending on the type of object to be dried, the state of coating, and the drying situation.

In addition, conventionally, the blown airflow was taken in from the circulation circuit of the heat panel, but it was taken inside the radiant zone in the furnace to create a closed circuit circulation, so even if HC3-containing gas was generated in the circulation circuit, it would not escape to the outside of the system. It has the advantage of being a pollution-free drying system.

Furthermore, there is a secondary benefit of energy saving as the amount of exhaust air is reduced by the amount of closed circuit circulation.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of a drying system based on the conventional technology;
The figure is an explanatory diagram of an embodiment of the drying system of the present invention. 1... Setting sea 7.18... Convection zone. 4...Radiation zone, 17...Suction port, 13...Blowing nozzle, 14...Forced blowing circuit, 5...Heat panel, 9...Hot air circuit, 11...Exhaust duct, 8・
... Burner, 19°20... Suction circuit, 21... Selector switch.

Claims (1)

[Claims] 1. The radiant zone, which performs the drying action while the object to be dried moves from the setting zone to the convection zone, has a suction port in the upper part of the radiant zone and a spray nozzle in the lower part, forming a closed circuit. In an upper radiant lower forced blow drying system in which a circuit is provided and an upper radiant heat panel heating hot air circuit is installed, a direct flame facing the heat panel heating hot air circuit having an exhaust duct for the upper radiant A suction circuit connected to the combustion burner is branch-connected to the setting zone and the convection zone via a changeover switch, so that the HC3-containing exhaust air generated in the setting zone and the convection zone can be sucked. A drying system characterized by: