Device for accurately controlling air supply and exhaust and temperature of drying oven of coating production line

Abstract

The utility model relates to the field of acoustics, in particular to a device for accurately controlling air supply and exhaust and temperature of a coating production line oven, which comprises a production line coating head and a fresh air supply pipeline after fresh air is mixed, the fresh air supply pipeline is connected with an air mixing box, and a fresh air door is arranged on the fresh air supply pipeline; the hot air pipeline is formed by the hot air system and is connected with the air mixing box through a hot air door; the air outlet end of the air mixing box is connected with an air inlet fan through a pipeline, the air inlet fan is connected with an air inlet of the drying oven through a pipeline, and a drying oven inlet air door is arranged on the pipeline of the air inlet fan and the drying oven. Compared with the prior art, the device has the advantages that any temperature and air volume requirements of the oven within design specifications can be simply, conveniently and quickly met, the oven is stable in temperature, exhaust air volume and waste gas solvent concentration, the temperature and air volume adjusting speed of the oven of a production line can be increased to the maximum extent, and the production efficiency and the quality of products are improved.

Description

Technical Field

[0001] The utility model relates to the field of coating production, in particular to a device for accurately controlling air supply and exhaust and temperature of an oven in a coating production line. Background Art

[0002] In the coating or gluing industry, production lines usually use thermal oil or hot air to heat the production line oven to meet the requirements of volatile organic solvents in the coating production line. Therefore, the control of oven temperature and air volume is a key factor in determining product quality.

[0003] At present, most of the ovens on the market use heat transfer oil or terminal electric heating to heat the production line ovens, and no hot air system is introduced to heat the production line. Although the initial investment is large, the method of using hot air to heat the coating production line has the advantages of safety, cleanliness and low cost, and is increasingly trusted and welcomed by the majority of coating manufacturers.

[0004] The core control difficulty of the hot air system lies in real-time and accurate control of the temperature and air intake and exhaust volume of each oven according to the temperature and capacity changes of each oven, so as to meet the changing product production requirements of customers. The higher the product, the higher the requirement for oven temperature control accuracy.

[0005] In the prior art, there are: the air mixing box uses a proportional valve and has no circulating air, and the air intake and exhaust pipelines have exhaust fans but no overall control valve. At the same time, the air volume of the oven also has an important impact on the entire RTO system. By reasonably adjusting the air intake, circulating air volume and exhaust air volume of the air mixing box in front of the oven, the total exhaust air volume and oven temperature of each oven can be effectively and quickly controlled. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a device for precise control of air supply, exhaust and temperature of an oven in a coating production line, so as to effectively and quickly control the total exhaust air volume and oven temperature of each oven section.

[0007] In order to achieve the above purpose, a device for precise control of air supply, exhaust and temperature of the coating production line oven is designed, including

[0008] A fresh air supply pipeline after the coating head of the production line mixes with the fresh air, the fresh air supply pipeline is connected to the air mixing box, and a fresh air damper is provided on the fresh air supply pipeline;

[0009] A hot air pipeline formed by the hot air system, wherein the hot air pipeline is connected to an air mixing box through a hot air damper;

[0010] The air outlet end of the air mixing box is connected to the air inlet fan through a pipeline, and the air inlet fan is connected to the air inlet of the oven through a pipeline. The pipelines of the air inlet fan and the oven are provided with an oven inlet damper;

[0011] The oven is also provided with a return air duct, one end of which is connected to the oven return air port, and the other end of which is connected to the duct between the air mixing box and the air inlet fan.

[0012] The fresh air damper adjusts the fresh air supply volume by adjusting the damper opening.

[0013] The hot air damper adjusts the hot air supply volume by adjusting the damper opening.

[0014] The oven inlet damper adjusts the air supply volume at the oven inlet by adjusting the damper opening.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The utility model adds fresh air dampers, hot air dampers and exhaust dampers, as well as circulating air ducts and control dampers. It can easily and quickly achieve any temperature and air volume requirements of the oven within the design specifications, and the oven temperature is stable, the exhaust air volume and the exhaust gas solvent concentration are stable, which can maximize the temperature and air volume adjustment speed of the production line oven, improve product production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 , schematic diagram of the structure of the device;

[0018] In the figure: 1.1 production line coating head; 1.2 coating head exhaust fan; 1.3 coating head fresh air; 2.1 hot air system; 2.2 hot air fan; 2.3 hot air damper; 2.4 hot air duct; 3.1 fresh air filter; 3.2 fresh air damper; 3.3 mixing box; 3.4 fresh air supply duct; 4.1 air inlet fan; 4.2 oven inlet damper; 4.3 oven; 4.4 hot air nozzle; 4.5 temperature detection; 4.6 circulating air damper; 4.7 oven air inlet; 4.8 return air duct; 4.9 oven return air; 5.1 exhaust damper; 5.2 exhaust fan; 5.3 RTO regenerative exhaust gas oxidation furnace. DETAILED DESCRIPTION

[0019] In order to make the purpose, principle and structure of the utility model clearer, it is further described below in conjunction with the drawings and specific embodiments.

[0020] The utility model provides a device for accurately controlling air supply, exhaust and temperature of an oven in a coating production line, comprising:

[0021] A fresh air supply pipeline 3.4 after the production line coating head 1.1 and the fresh air are mixed, the fresh air supply pipeline 3.4 is connected to the air mixing box 3.3, and a fresh air damper 3.2 is provided on the fresh air supply pipeline 3.4;

[0022] A hot air pipeline 2.4 formed by the hot air system, wherein the hot air pipeline 2.4 is connected to the air mixing box 3.3 via the hot air damper 2.3;

[0023] The air outlet end of the air mixing box 3.3 is connected to the air inlet fan 4.1 through a pipeline, and the air inlet fan 4.1 is connected to the oven air inlet 4.7 through a pipeline. The air inlet fan 4.1 and the oven pipeline are provided with an oven inlet damper 4.2;

[0024] The oven 4.3 is also provided with a return air pipeline 4.8, one end of which is connected to the oven return air port 4.9, and the other end of which is connected to the pipeline between the air mixing box 3.3 and the air inlet fan 4.1.

[0025] The fresh air damper 3.2 adjusts the fresh air supply volume by adjusting the damper opening. The hot air damper 2.3 adjusts the hot air supply volume by adjusting the damper opening. The oven inlet damper 4.2 adjusts the oven inlet air supply volume by adjusting the damper opening.

[0026] Specific control scheme:

[0027] 1. When the oven temperature 4.3 is too high and the exhaust volume is too large, a. reduce the opening of the hot air damper 2.3; b. reduce the frequency of the air inlet fan 4.1; c. reduce the opening of the oven inlet damper 4.2; d. reduce the frequency of the exhaust fan 5.2; e. reduce the opening of the exhaust damper 5.1.

[0028] 2. When the oven temperature 4.3 is too high and the exhaust volume is too small, a. increase the opening of the fresh air damper 2.3; b. increase the frequency of the coating head exhaust fan 1.2; c. increase the opening of the oven inlet damper 4.2; d. increase the frequency of the air inlet fan 4.1; e. increase the frequency of the exhaust fan 5.2; f. increase the opening of the exhaust damper 5.1.

[0029] 3. When the oven temperature 4.3 is too low and the exhaust volume is too large, a. increase the opening of the hot air damper 2.3; b. reduce the opening of the fresh air damper 2.3; c. increase the frequency of the hot air fan 2.2; d. reduce the frequency of the inlet fan 4.1; e. reduce the opening of the oven inlet damper 4.2; f. reduce the frequency of the exhaust fan 5.2; g. reduce the opening of the exhaust damper 5.1; h. increase the opening of the circulation damper 4.6.

[0030] 4. When the oven temperature 4.3 is too low and the exhaust volume is too small, a. Increase the opening of the hot air damper 2.3; b. Increase the frequency of the hot air fan 2.2; c. Increase the opening of the oven inlet damper 4.2; d. Increase the frequency of the air inlet fan 4.1; e. Increase the frequency of the exhaust fan 5.2; f. Increase the opening of the exhaust damper 5.1; g. Increase the opening of the circulation damper 4.6

[0031] It is worth mentioning that:

[0032] The air supply of the production line comes from three sources: one is the fresh air mixed with the coating head and the fresh air, the second is the high-temperature hot air provided by the hot air system, and the third is the circulating air of the oven. The technical solution of the present application can accurately control the air volume of each air intake pipeline by setting a control damper on each air intake pipeline. At the same time, the air intake volume of the high-temperature hot air can be adjusted or the air intake temperature of the high-temperature hot air can be increased according to the temperature requirements of the oven to meet the temperature requirements of the oven. The exhaust volume of the oven also determines the total air volume entering the RTO system. If the air volume is too large, it will exceed the processing capacity of the RTO system, resulting in the equipment being unable to operate normally. The exhaust volume of each oven section can be controlled by adjusting the fan frequency of the exhaust fan and the size of the exhaust damper. At the same time, the air volume of the circulating air can be appropriately adjusted in combination with the temperature requirements of the oven. Increasing the circulating air volume can increase and stabilize the oven temperature and reduce the exhaust volume

[0033] The above is only a specific implementation method of this utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the utility model, according to the technical solution and new concept of the utility model, shall be covered by the protection scope of the utility model.

Claims

1. A device for precise control of air supply, exhaust and temperature of a coating production line oven, characterized in that include A fresh air supply pipeline after the coating head of the production line mixes with the fresh air, the fresh air supply pipeline is connected to the air mixing box, and a fresh air damper is provided on the fresh air supply pipeline; A hot air pipeline formed by the hot air system, wherein the hot air pipeline is connected to an air mixing box through a hot air damper; The air outlet end of the air mixing box is connected to the air inlet fan through a pipeline, and the air inlet fan is connected to the air inlet of the oven through a pipeline. The pipelines of the air inlet fan and the oven are provided with an oven inlet damper; The oven is also provided with a return air duct, one end of which is connected to the oven return air port, and the other end of which is connected to the duct between the air mixing box and the air inlet fan.

2. A device for precise air supply, exhaust and temperature control of a coating production line oven as claimed in claim 1, characterized in that The fresh air damper adjusts the fresh air supply volume by adjusting the damper opening.

3. A device for precise air supply, exhaust and temperature control of a coating production line oven as claimed in claim 1, characterized in that The hot air damper adjusts the hot air supply volume by adjusting the damper opening.

4. A device for precise air supply, exhaust and temperature control of a coating production line oven as claimed in claim 1, characterized in that The oven inlet damper adjusts the air supply volume at the oven inlet by adjusting the damper opening.

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