A hot air secondary circulation device for a coating machine

Abstract

This utility model relates to the field of secondary circulation devices and discloses a hot air secondary circulation device for a coating machine. It includes a filter housing, a circulation bend at the top of the filter housing, a fresh air connection pipe fixedly installed at the middle end of the circulation bend, and a bent outlet pipe fixedly installed at the bottom of the filter housing. The bent end of the circulation bend is used to connect to the outlet end of the hot air equipment, and the fresh air connection pipe is used to connect to the hot air generating equipment. This achieves efficient recovery and utilization of waste heat, effectively solving the problem of heat energy waste caused by the direct emission of drying exhaust gas in traditional processes. The device recovers the drying exhaust gas carrying a large amount of waste heat to the filter housing, purifies it, mixes it with fresh air, and recirculates it to the drying area. This fully utilizes the residual heat in the exhaust gas, reduces the energy consumption required for the hot air generating equipment to generate fresh air, significantly reduces energy costs in the production process, and aligns with the development trend of energy conservation and consumption reduction in the manufacturing industry.

Description

Technical Field

[0001] This utility model relates to the field of secondary circulation devices, specifically a hot air secondary circulation device for a coating machine. Background Technology

[0002] In the coating production process, the drying stage of the coating machine is a key step to ensure coating quality and production efficiency. Its core principle is to use a hot air generator to output high-temperature hot air to quickly dry and cure the coating on the surface of the substrate. Currently, most conventional coating machine drying systems in the industry adopt a "one-time hot air supply" mode: the hot air generator continuously generates new hot air, which is delivered to the drying area through a pipeline to complete the coating drying. After the coating is dried, the exhaust gas carrying coating volatiles, dust impurities, and some residual heat is directly discharged to the outside through an exhaust pipe.

[0003] This traditional process has the following significant technical defects:

[0004] Serious energy waste: The exhaust gas after drying still retains a high temperature (usually 60%-80% of the initial hot air temperature). This part of the waste heat is not recovered and utilized, and direct emission leads to a large amount of heat loss. At the same time, it is necessary to continuously consume energy to generate new hot air, resulting in high energy costs.

[0005] Environmental pressure is prominent: the exhaust gas contains toxic and harmful substances volatilized from the coating (such as solvent vapor) and dust impurities generated during the production process. Direct emission will pollute the surrounding environment and does not meet the strict requirements of current environmental regulations on industrial waste gas emissions. Some enterprises need to configure additional exhaust gas treatment equipment, which further increases the equipment investment and operating costs. To address this, we have proposed a hot air secondary circulation device for coating machines. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a hot air secondary circulation device for a coating machine, which solves the aforementioned problems.

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a hot air secondary circulation device for a coating machine, comprising a filter box, a circulation bend pipe provided at the top of the filter box, a fresh air connection pipe fixedly installed at the middle end of the circulation bend pipe, and a bent outlet pipe fixedly installed at the bottom of the filter box. The bent end of the circulation bend pipe is used to connect to the outlet end of the hot air equipment, and the fresh air connection pipe is used to connect to the hot air generating equipment.

[0008] Preferably, the filter housing includes a filter housing and a detachable filter assembly disposed inside the filter housing. An opening is provided on one side of the filter housing, and a pull-out cover is provided at the opening of the filter housing.

[0009] Preferably, an inner wall groove is provided on the upper and lower inner walls of the filter box opening, and a strip-shaped protrusion is integrally formed on the cover plate at the position corresponding to the inner wall groove, and the strip-shaped protrusion is slidably engaged with the inner wall groove.

[0010] Preferably, a handle is fixedly installed on the cover plate, and the cover plate can be opened by pulling the handle.

[0011] Preferably, the filtration assembly includes an activated carbon adsorption plate, a filter screen, and two mounting frames. The activated carbon adsorption plate and the filter screen are respectively installed inside the mounting frames at corresponding positions, and the filter screen is located below the activated carbon adsorption plate.

[0012] Preferably, the inner wall of the filter box is provided with an inner wall groove, and the mounting frame is integrally formed with a strip-shaped protrusion at the position corresponding to the inner wall groove, and the inner wall groove and the strip-shaped protrusion are engaged together.

[0013] Compared with the prior art, this utility model provides a hot air secondary circulation device for a coating machine, which has the following beneficial effects:

[0014] This system achieves efficient recovery and utilization of waste heat, effectively solving the problem of heat energy waste caused by the direct emission of drying exhaust gas in traditional processes. The device recovers the drying exhaust gas carrying a large amount of waste heat to the filter box, where it is purified and then mixed with fresh air before being recirculated to the drying area. This fully utilizes the residual heat in the exhaust gas, reduces the energy consumption required for the hot air generating equipment to produce fresh air, and significantly reduces energy costs in the production process, aligning with the development trend of energy conservation and emission reduction in the manufacturing industry.

[0015] It boasts excellent exhaust gas purification performance, effectively alleviating the environmental pressure of traditional processes. Through the dual treatment of filter screen and activated carbon adsorption plate, it can efficiently remove particulate matter such as dust and impurities from exhaust gas, and adsorb toxic and harmful substances generated by coating volatilization. This avoids the direct emission of pollutants and damage to the environment, eliminating the need for additional dedicated exhaust gas treatment equipment, reducing the investment and operating costs of environmental protection equipment, and meeting the current stringent environmental regulations.

[0016] This improves the utilization rate of hot air resources and overall production efficiency. The hot air undergoes a secondary circulation and reuse, reducing the demand for fresh air and lowering resource consumption during fresh air generation. Furthermore, the mixing of circulating hot air and fresh air makes it easier to maintain stable air volume and temperature, avoiding temperature fluctuations in the drying area caused by frequent hot air replenishment in traditional processes. This ensures uniform coating curing, helps improve product surface quality and yield, and reduces production scrap rates.

[0017] The device is highly easy to maintain, effectively reducing equipment maintenance costs and downtime. The filter components are designed to be detachable through a snap-fit ​​structure between the mounting frame and the filter housing. The cover uses a pull-out opening and closing mechanism, coupled with a handle, making the replacement of the filter screen and activated carbon adsorption plate simple and efficient. No complicated tools or professional skills are required, reducing equipment maintenance difficulty and downtime for repairs, and ensuring production continuity. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0020] Figure 3 This is a side view of the present invention;

[0021] Figure 4 for Figure 3 Schematic diagram of the BB section;

[0022] Figure 5 for Figure 4 A magnified view of part C in the diagram.

[0023] In the diagram: 1. Filter box; 2. Circulation bend; 3. Fresh air connection pipe; 4. Outlet pipe; 5. Cover plate; 6. Handle; 7. Inner wall groove one; 8. Strip protrusion one; 9. Activated carbon adsorption plate; 10. Filter screen; 11. Mounting frame; 12. Inner wall groove two; 13. Strip protrusion two. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5A hot air secondary circulation device for a coating machine includes a filter box. A circulation bend 2 is provided on the top of the filter box. A fresh air connection pipe 3 is fixedly installed on the middle end of the circulation bend 2. A bent outlet pipe 4 is fixedly installed on the bottom of the filter box. The bent end of the circulation bend 2 is used to connect to the outlet end of the hot air equipment. The fresh air connection pipe 3 is used to connect to the hot air generating equipment. The bent end of the outlet pipe 4 is used to connect to the outlet end of the drying equipment of the coating machine. The residual hot air generated in the drying equipment enters the filter box through the outlet pipe 4, and then the exhaust gas is filtered. Then it enters the interior of the circulation bend 2. The fresh air entering the interior of the fresh air connection pipe 3 mixes with the filtered exhaust gas and then recirculates into the drying area of ​​the coating machine to achieve secondary circulation.

[0026] Furthermore, the filter housing includes a filter housing 1 and a detachable filter assembly disposed inside the filter housing 1. An opening is provided on one side of the filter housing 1, and a pull-out cover 5 is provided at the opening of the filter housing 1.

[0027] Furthermore, the filter box 1 has an inner wall groove 7 on the upper and lower inner walls at the opening, and the cover plate 5 has an integrally formed strip protrusion 8 at the position corresponding to the inner wall groove 7. The strip protrusion 8 is slidably engaged with the inner wall groove 7.

[0028] Furthermore, a handle 6 is fixedly installed on the cover plate 5, which can be used to open the cover plate 5 by pulling the handle 6.

[0029] Furthermore, the filter assembly includes an activated carbon adsorption plate 9, a filter screen 10, and two mounting frames 11. The activated carbon adsorption plate 9 and the filter screen 10 are respectively installed inside the mounting frames 11 at corresponding positions. The filter screen 10 is located below the activated carbon adsorption plate 9. When the exhaust gas enters the filter box 1 through the outlet pipe 4, the filter screen 10 first filters the exhaust gas. After the filtration is completed, the filter screen 10 adsorbs the toxic substances in the exhaust gas.

[0030] Furthermore, an inner wall groove 12 is provided on the inner wall of the filter box 1. A strip-shaped protrusion 13 is integrally formed on the mounting frame 11 at the position corresponding to the inner wall groove 12. The inner wall groove 12 and the strip-shaped protrusion 13 are engaged together. In the case of long-term use, the cover plate 5 is slid horizontally to open the filter box 1, and then the activated carbon adsorption plate 9 or filter screen 10 that needs to be replaced can be pulled out and replaced with a new one.

[0031] Working principle: The bent end of the outlet pipe 4 is used to connect to the outlet end of the drying equipment of the coating machine. The residual hot air generated in the drying equipment enters the filter box through the outlet pipe 4, and then the exhaust gas is filtered. Then it enters the interior of the circulation bend pipe 2. Then the fresh air entering the fresh air connection pipe 3 mixes with the filtered exhaust gas and then recirculates into the drying area of ​​the coating machine to achieve secondary circulation.

[0032] Structural Description:

[0033] Filter box 1

[0034] It is the core filter component of the hot air secondary circulation device of the coating machine, and is equipped with a detachable filter assembly. An opening is provided on one side for installing a pull-out cover 5. Inner wall grooves 7 are also provided on the upper and lower inner walls of the opening to provide a fitting structure for the cover 5. Its main function is to receive the residual hot air from the drying process delivered by the outlet pipe 4, and then filter and adsorb toxic substances through the internal filter assembly to provide clean air for the hot air secondary circulation.

[0035] Circulation bend 2

[0036] It is fixedly installed on the top of the filter box 1, and the bent end is used to connect to the outlet end of the hot air equipment. The interior can hold the exhaust gas after being treated by the filter box 1, and at the same time provide a mixing space for the fresh air introduced by the fresh air connection pipe 3. Finally, the mixed gas is delivered to the drying area of ​​the coating machine to realize the secondary circulation of hot air.

[0037] Fresh air connection pipe 3

[0038] It is fixedly installed at the middle end of the circulation bend 2 and is used to connect to the hot air generating equipment. Its core function is to introduce fresh hot air into the circulation bend 2 and mix it thoroughly with the filtered exhaust gas to ensure that the volume and temperature of the secondary circulating hot air meet the drying requirements.

[0039] Export pipe 4

[0040] It is bent and fixedly installed at the bottom of the filter box 1, with the bent end used to connect to the outlet end of the coating machine's drying equipment. Its main function is to transport the residual hot air generated by the drying equipment into the filter box 1, providing the initial gas source for the secondary hot air circulation.

[0041] Cover plate 5

[0042] It has a pull-out structure and is installed at the opening of the filter box 1. A strip-shaped protrusion 8 is integrally formed at the position of the groove 7 on the inner wall of the filter box 1, and a handle 6 is fixedly installed on the surface. It achieves sliding engagement with the groove 7 on the inner wall to ensure the airtightness of the filter box 1. The pull-out operation can open the filter box 1 for easy replacement of the internal filter components.

[0043] Handle 6

[0044] It is fixedly installed on the cover plate 5, providing a force point for the pull-out operation of the cover plate 5. The cover plate 5 can be easily opened or closed by pulling the handle 6, simplifying the opening and closing process of the filter box 1 and facilitating the subsequent maintenance and replacement of the filter components.

[0045] Inner wall groove 17

[0046] The upper and lower inner walls of the filter housing 1 are fitted with mounting structures that mate with the cover plate 5. These structures slide and engage with the strip-shaped protrusions 8 on the cover plate 5, ensuring both the stability of the cover plate 5 after installation and the sealing performance of the filter housing 1, while also not affecting the pull-out operation of the cover plate 5.

[0047] Strip-shaped protrusion - 8

[0048] The integral molding at the position corresponding to the inner wall groove 7 of the cover plate 5 is the key structure for connecting the cover plate 5 and the filter box 1. Through the sliding engagement with the inner wall groove 7, the cover plate 5 can be stably installed at the opening of the filter box 1, while realizing the pull-out and opening function of the cover plate 5.

[0049] Activated carbon adsorption plate 9

[0050] It is installed inside the mounting frame 11 at the corresponding position, above the filter screen 10. In the exhaust gas treatment process, it undertakes the initial filtration of the filter screen 10, and its main function is to adsorb toxic substances in the exhaust gas, further purify the gas, and prevent toxic substances from affecting product quality or the environment with the secondary circulating hot air.

[0051] Filter 10

[0052] Installed inside the mounting frame 11 at the corresponding position, below the activated carbon adsorption plate 9. It is the first process component in the exhaust gas treatment. When the exhaust gas enters the filter box 1 through the outlet pipe 4, it first filters the exhaust gas to remove impurities, dust and other particulate matter, providing pretreatment for the subsequent adsorption of toxic substances by the activated carbon adsorption plate 9.

[0053] Installation box 11

[0054] Two sections are provided, one for installing the activated carbon adsorption plate 9 and the other for installing the filter screen 10. The inner side provides installation space for the adsorption plate and the filter screen. A strip-shaped protrusion 13 is integrally formed at the position corresponding to the groove 12 on the inner wall of the filter box 1. It is fixedly installed by cooperating with the groove 12 on the inner wall, and at the same time facilitates the subsequent disassembly and replacement of the internal adsorption plate or filter screen.

[0055] Inner wall groove 2 12

[0056] It is a mounting structure for mounting frame 11, which is formed on the inner wall of filter box 1. By engaging with the strip protrusion 13 on the mounting frame 11, the mounting frame 11 and the activated carbon adsorption plate 9 and filter screen 10 inside are stably fixed inside the filter box 1, ensuring the stability of the components during the filtration process.

[0057] Strip-shaped protrusions 213

[0058] The integrally molded mounting frame 11, corresponding to the inner wall groove 12, is the core structure connecting the mounting frame 11 and the filter box 1. Through its snap-fit ​​engagement with the inner wall groove 12, the mounting frame 11 can be quickly assembled and disassembled, facilitating the replacement and maintenance of the activated carbon adsorption plate 9 or the filter screen 10 after prolonged use.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coating machine hot air secondary circulation device, characterized by, The filter box includes a filter housing, a circulation bend (2) is provided on the top of the filter housing, a fresh air connection pipe (3) is fixedly installed on the middle end of the circulation bend (2), a bent outlet pipe (4) is fixedly installed on the bottom of the filter housing (1), the bent end of the circulation bend (2) is used to connect to the outlet end of the hot air equipment, and the fresh air connection pipe (3) is used to connect to the hot air generating equipment.

2. The hot air secondary circulation device of a coating machine according to claim 1, characterized in that: The filter box includes a filter box (1) and a detachable filter assembly disposed inside the filter box (1). An opening is provided on one side of the filter box (1), and a pull-out cover (5) is provided at the opening of the filter box (1).

3. The hot air secondary circulation device of a coating machine according to claim 2, characterized in that: The filter box (1) has an inner wall groove (7) on the upper and lower inner walls at the opening. The cover plate (5) has a strip protrusion (8) integrally formed at the position corresponding to the inner wall groove (7). The strip protrusion (8) is slidably engaged with the inner wall groove (7).

4. The hot air secondary circulation device of a coating machine according to claim 2, characterized in that: A handle (6) is fixedly installed on the cover plate (5).

5. The hot air secondary circulation device for a coating machine according to claim 2, characterized in that: The filter assembly includes an activated carbon adsorption plate (9), a filter screen (10), and two mounting frames (11). The activated carbon adsorption plate (9) and the filter screen (10) are respectively installed inside the mounting frames (11) at corresponding positions. The filter screen (10) is located below the activated carbon adsorption plate (9).

6. The hot air secondary circulation device of a coating machine according to claim 5, characterized in that: The filter box (1) has an inner wall groove (12) on its inner wall. The mounting frame (11) has a strip protrusion (13) integrally formed at the position corresponding to the inner wall groove (12). The inner wall groove (12) and the strip protrusion (13) are engaged together.

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