CN103267412A - Automatic control system for microwave drying machine - Google Patents

Abstract

The invention discloses an automatic control system of a microwave dryer. A thermal imaging camera is installed on the upper casing of the microwave dryer outlet. The thermal imaging camera is connected to a computer through an image acquisition card. The microwave generator is installed in the microwave drying On the top of the machine, the conveyor belt drive motor is connected to the conveyor belt through the transmission sprocket pair, and the microwave generator and the conveyor belt drive motor are respectively connected to the computer through the programmable controller. The present invention accurately senses the drying temperature of materials through a thermal imaging camera, an acquisition card and a computer, automatically adjusts the power of the microwave generator and the speed of the conveyor belt drive motor according to the set target drying temperature, and improves the automation and intelligence of the automatic control of the microwave dryer Level, can be widely used in the automatic control of microwave dryers.

Description

An Automatic Control System of Microwave Dryer

technical field

The invention belongs to the field of microwave drying, and in particular relates to a control system of a microwave drying device.

Background technique

Traditional drying methods, such as flame, hot air, steam, electric heating, etc., are all external heating and drying. After the surface of the material absorbs heat, the heat penetrates into the interior of the material through conduction, and the moisture inside the material diffuses outward to the surface and leaves the material, so that The material is dried. Microwave drying is completely different. It is a method of internal heating, and its heat conduction direction is the same as that of moisture diffusion. Compared with traditional drying methods, microwave drying has the advantages of high drying rate, energy saving, high production efficiency, uniform drying, and good product quality, so it has been paid more and more attention in various fields.

In the microwave drying process, it is very important to grasp the drying condition of the material in time and dynamically adjust the drying parameters to ensure the drying effect of the material. At present, there are two main types of sensing methods for the drying of materials in microwave drying equipment: one is the sight glass method, which opens an observation port on the microwave drying equipment, and then equips with auxiliary lighting sources and shielding measures, relying on manual naked eyes to observe the materials in the equipment. of dryness. This type of method is labor-intensive, and it is difficult to sense the dryness of the material in real time and accurately. At the same time, if the shielding measures are not in place, it is easy to affect the health of the workers. The second type of method is as described in patents (200720031024.9, 201020616615.4). The image of the material in the equipment during the drying process is obtained through the monitor, and the image of the material is displayed on the monitor in real time. Although this type of method can keep workers away from radiation sources and monitor the drying condition of materials in real time, the interpretation of material images on the display still depends on the subjective experience of workers, making the entire monitoring accuracy poor and inefficient; at the same time, this type of method cannot According to the monitoring results, the parameters of the microwave dryer are automatically adjusted in time.

Contents of the invention

The invention proposes an automatic control system of a microwave dryer, which is used for accurately sensing the drying state of materials and automatically adjusting the parameters of the microwave dryer to realize fully automatic control of microwave drying.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

An automatic control system for a microwave dryer, characterized in that: a thermal imaging camera 2 is installed on the housing 1 above the discharge port of the microwave dryer, and the thermal imaging camera 2 is connected to a computer 4 through an image acquisition card 3, and microwaves generate The device 5 is installed on the top of the microwave dryer, the conveyor belt drive motor 6 is connected to the conveyor belt 8 through the transmission sprocket pair 7, and the microwave generator 5 and the conveyor belt drive motor 6 are respectively connected to the computer 4 through the programmable controller 9; The height and angle of the imaging camera 2 can make the field of view of the thermal imaging camera 2 be located on the conveyor belt 8; The signal intensity of the pixel corresponds to the temperature of the material 10 at the pixel, and the higher the signal intensity of the pixel, the higher the temperature of the material at the pixel; the display 12 is connected to the computer 4; the programmable control Device 9 is connected with computer 4, microwave generator 5, conveyor belt drive motor 6 respectively, and computer 4 can control the power of microwave generator 5 and the rotating speed of conveyor belt drive motor 6 through programmable controller 9.

The beneficial effects of the present invention are: the microwave dryer accurately senses the drying temperature of the material through the thermal imaging camera, the acquisition card and the computer, and the system automatically adjusts the power of the microwave generator and the speed of the conveyor belt drive motor according to the set target drying temperature, thereby getting rid of the The existing microwave dryer relies on manual operation, which improves the automation and intelligence level of microwave drying.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of the present invention.

In the figure: 1 casing, 2 thermal imaging camera, 3 image acquisition card, 4 computer, 5 microwave generator, 6 conveyor belt drive motor, 7 drive sprocket pair, 8 conveyor belt phase, 9 programmable controller, 10 material , 11 thermal imaging images, 12 displays.

Detailed ways

The present invention will be described in detail below in conjunction with various embodiments shown in the drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present invention.

The technical scheme of the present invention is described in detail in conjunction with the accompanying drawings.

The automatic control system of the microwave dryer, the thermal imaging camera 2 is installed on the casing 1 above the discharge port of the microwave dryer, the thermal imaging camera 2 is connected with the computer 4 through the image acquisition card 3, and the microwave generator 5 is installed in the microwave drying machine. At the top of the machine, the conveyor belt drive motor 6 is connected to the conveyor belt phase 8 through the transmission sprocket pair 7, and the microwave generator 5 and the conveyor belt drive motor 6 are respectively connected to the computer phase 4 through the programmable controller 9.

The thermal imaging camera 2 can perform thermal imaging on the material 10 on the conveyor belt 8, the signal intensity of each pixel in the thermal imaging image 11 of the material 10 corresponds to the temperature of the material 10 at the pixel point one by one, and the signal of the pixel point The higher the intensity, the higher the temperature of the material at the pixel point; adjust the height and angle of the thermal imaging camera 2 so that the field of view of the thermal imaging camera 2 is located on the conveyor belt 8 .

The image acquisition card 3 sends the thermal imaging image 11 of the material 10 captured by the thermal imaging camera 2 to the display 12 of the computer 4 .

The computer 4 quickly calculates the drying temperature of the material 10 according to the thermal imaging image 11 of the material.

When the microwave dryer is working normally, the thermal imaging camera 2 acquires the thermal imaging image 11 of the material 10 on the conveyor belt 8 at the outlet in real time, and the image acquisition card 3 sends the thermal imaging image 11 to the computer 4, and the computer 4 then according to the material 10 The thermal imaging image 11 calculates the drying temperature of the material. The computer 4 automatically controls the power of the microwave generator 5 and the speed of the conveyor belt drive motor 6 through the programmable controller 9 according to the drying temperature of the material, thereby realizing automatic control of the material drying process.

Claims (1)

1. An automatic control system for a microwave dryer, including a housing (1), a thermal imaging camera (2), an image acquisition card (3), a computer (4), a microwave generator (5), and a conveyor belt drive motor ( 6), transmission sprocket pair (7), conveyor belt phase (8), programmable controller (9), material (10), thermal imaging image (11), display (12); it is characterized in that: drying in microwave A thermal imaging camera (2) is installed on the casing (1) at the upper part of the discharge port of the machine. The thermal imaging camera (2) is connected to the computer (4) through the image acquisition card (3), and the microwave generator (5) is installed in the microwave On the top of the dryer, the conveyor belt drive motor (6) is connected to the conveyor belt (8) through the transmission sprocket pair (7), and the microwave generator (5) and the conveyor belt drive motor (6) are respectively controlled by the programmable controller (9 ) is connected with the computer phase (4); the height and angle of the thermal imaging camera (2) can make the field of view of the thermal imaging camera (2) be positioned on the conveyor belt (8); the thermal imaging camera (2) can be on the conveyor belt ( 8) The material (10) on the top is thermally imaged, and the signal intensity of each pixel in the thermal imaging image (11) of the material (10) corresponds to the temperature of the material (10) at the pixel; the display (12 ) is connected to the computer (4); the programmable controller (9) is connected with the computer (4), the microwave generator (5), the conveyor belt drive motor (6) respectively, and the computer can pass the programmable controller (9) ) to control the power of the microwave generator (5) and the rotating speed of the conveyor belt drive motor (6).

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