A VOCs exhaust gas treatment device for a printing plant

Abstract

This application provides a VOCs exhaust gas treatment device for a printing workshop, relating to the field of exhaust gas treatment technology. It includes: a mounting housing, a partition, an inlet pipe, an inlet switching valve, a heating element, a controller, and two filters. The partition divides the interior of the mounting housing into a working chamber and a backup chamber. Both the working chamber and the backup chamber have inlet and outlet ports on their inner walls. One end of the inlet pipe is connected to an exhaust gas source, and the other end has two inlet branch pipes, one connected to the inlet port of the working chamber and the other to the inlet port of the backup chamber. The inlet switching valve is located between the inlet branch pipe and the inlet pipe and is electrically connected to the controller. The two filters are respectively connected to the two inlet ports and are capable of filtering gas. The heating element is electrically connected to the controller. When the inlet pipe is connected to the working chamber, the heating element heats the filter in the backup chamber; when the inlet pipe is connected to the backup chamber, the heating element heats the filter in the working chamber. This application can achieve continuous purification of exhaust gas.

Description

Technical Field

[0001] This application relates to the field of waste gas treatment technology, and in particular to a VOCs waste gas treatment device for a printing workshop. Background Technology

[0002] VOCs waste gas treatment in printing workshops is a crucial aspect of environmental pollution control. The adsorption method is typically used to treat VOCs waste gas, employing porous adsorption materials to capture organic pollutants in the waste gas. Once the adsorption is saturated, the adsorbent is regenerated or replaced.

[0003] Existing adsorption treatment devices generally consist of an adsorption tank and an adsorption medium such as activated carbon filled within it. When waste gas passes through the adsorption layer, pollutants are trapped, and the purified gas is discharged. However, when the adsorbent becomes saturated, the system must be shut down for replacement or desorption and regeneration using steam or hot air. This is not only cumbersome and generates secondary pollution, but the device also cannot operate continuously, affecting production efficiency.

[0004] Therefore, there is a need to provide a VOCs waste gas treatment device for printing workshops. Utility Model Content

[0005] To address the problem that existing adsorption treatment devices cannot operate continuously, this application provides a VOCs waste gas treatment device for printing workshops.

[0006] This application provides a VOCs exhaust gas treatment device for a printing workshop, which adopts the following technical solution: including a mounting shell, a partition, an air inlet pipe, an air inlet switching valve, a heating element, a controller, and two filters. The partition is located inside the mounting shell and divides the interior of the mounting shell into a working chamber and a spare chamber. Both the working chamber and the spare room have air inlets and outlets on their inner walls. One end of the air inlet pipe is connected to the exhaust gas source, and the other end of the air inlet pipe has two air inlet branch pipes. One of the two air inlet branch pipes is connected to the air inlet of the working chamber, and the other of the two air inlet branch pipes is connected to the air inlet of the spare room. The intake switching valve is located between the intake branch pipe and the intake pipe and is electrically connected to the controller. The two filters are respectively connected to the air inlets of the working chamber and the spare chamber, and are capable of filtering the gas entering the mounting housing through the air inlets; The heating element is electrically connected to the controller. When the intake switching valve disconnects the connection between the spare chamber and the intake pipe and connects the working chamber to the intake pipe, the controller can control the heating element to heat the filter element in the spare chamber so that the filter element releases the gas it has collected. When the intake switching valve disconnects the connection between the working chamber and the intake pipe and connects the spare chamber to the intake pipe, the controller can control the heating element to heat the filter element in the working chamber.

[0007] By adopting the above technical solution, the housing is divided into a working chamber and a backup chamber by a partition. The air inlet pipe is connected to the air inlet ports of both chambers via air inlet branch pipes, and the connection is controlled by an air inlet switching valve. Two filters filter the gas entering the working chamber and the backup chamber respectively. When the working chamber is working, the filter in the backup chamber can be heated by a heating element to release the collected gas for regeneration; when the backup chamber is working, the filter in the working chamber is heated for regeneration. Compared with existing adsorption treatment devices, there is no need to stop the machine to replace or desorb and regenerate the adsorbent, enabling continuous operation of the device, avoiding cumbersome operation, preventing secondary pollution, and improving production efficiency.

[0008] Specifically, the filter element includes a filter cylinder and a filter plate made of porous material. The filter cylinder has a connecting lug at its opening, and the opening of the filter cylinder can be bolted through the connecting lug to the inner wall of the mounting housing and screwed onto the air inlet, thus forming a purification space inside the filter cylinder that is isolated from the inside of the mounting housing. Each filter cylinder has a mounting hole on its body that leads to the inside of the cylinder, and the filter plate is disposed in the mounting hole and can seal the mounting hole.

[0009] By adopting the above technical solution, the filter cartridge is bolted to the inner wall of the mounting housing, which facilitates the installation and disassembly of the filter element and makes it easy to replace or maintain the filter element; the inside of the filter cartridge forms a purification space isolated from the inside of the mounting housing, which can prevent unfiltered exhaust gas from leaking into the mounting housing; the filter plate is set in the mounting hole of the filter cartridge and the mounting hole is sealed, which can effectively filter the gas entering the mounting housing through the air inlet.

[0010] Furthermore, each of the filter plates has a catalytic layer on the side away from the filter cylinder. When the filter plate is heated by the heating element, the catalytic layer can catalytically decompose the gas released by the filter plate.

[0011] By adopting the above technical solution, a catalytic layer is provided on the filter plate. When the filter plate is heated by the heating element, the catalytic layer can catalytically decompose the gas released by the filter plate, reduce pollutants in the exhaust gas, and improve the exhaust gas treatment effect.

[0012] Furthermore, the heating element includes two microwave generators, each corresponding to a filter cartridge. Each microwave generator is located on a corresponding filter cartridge and is capable of heating the filter plate on that filter cartridge.

[0013] By adopting the above technical solution, the microwave generator and the filter cartridge are installed one-to-one on the filter cartridge, which can accurately heat the filter plate on the filter cartridge, so that the filter plate releases the gas it has collected, which facilitates the regeneration of the filter plate and ensures the continuous filtration effect of the filter plate. Moreover, the microwave heating method has the characteristics of fast heating speed and high efficiency, which can improve the operating efficiency of the entire waste gas treatment device.

[0014] Furthermore, the partition is provided with an insulation layer inside, which can reduce heat transfer between the working chamber and the spare chamber.

[0015] By adopting the above technical solution, an insulation layer is set inside the partition, which can reduce heat transfer between the working chamber and the spare chamber, prevent the heat of one chamber from affecting the working environment of the other chamber and the working status of the filter element, and ensure the stability of the device operation and the filtration effect.

[0016] Furthermore, it also includes an exhaust pipe and an exhaust switching valve. One end of the exhaust pipe is connected to the outside, and the other end of the exhaust pipe is provided with two exhaust branch pipes. One of the two exhaust branch pipes is connected to the exhaust port of the working chamber, and the other of the two exhaust branch pipes is connected to the exhaust port of the spare chamber. The exhaust switching valve is located between the exhaust branch pipe and the exhaust pipe. The controller is electrically connected to the exhaust switching valve. When the intake switching valve disconnects the connection between the spare chamber and the intake pipe, the controller can control the exhaust switching valve to disconnect the connection between the spare chamber and the exhaust pipe and connect the working chamber to the exhaust pipe. When the intake switching valve disconnects the connection between the working chamber and the intake pipe, the controller can control the exhaust switching valve to disconnect the connection between the working chamber and the exhaust pipe and connect the spare chamber to the exhaust pipe.

[0017] By adopting the above technical solution, an outlet pipe and an outlet switching valve are set up, and the controller is electrically connected to the outlet switching valve. When the inlet switching valve controls the connection status between the working chamber or the standby chamber and the inlet pipe, the controller can synchronously control the outlet switching valve to connect the corresponding working chamber or the standby chamber to the outlet pipe. This ensures that during the waste gas treatment process, the working chamber or standby chamber that is treating waste gas can discharge the purified gas to the outside, while the gas in the working chamber or standby chamber that releases waste gas due to heat will be continuously catalyzed by the catalyst layer in that chamber. This enables the waste gas treatment device to operate continuously and stably, avoiding the impact on production efficiency due to shutdown for replacement or regeneration of the adsorbent when it is saturated.

[0018] Furthermore, it also includes an exchange assembly, which includes a first connecting pipe, a second connecting pipe, a first control valve, a second control valve, a first one-way valve, and a second one-way valve. One end of the first connecting pipe passes through a through hole in the filter plate and leads to the filter cartridge inside the working chamber. The other end of the first connecting pipe passes through a through hole in the partition plate and connects to the spare chamber. One end of the second connecting pipe passes through a through hole in the filter plate and leads to the filter cartridge inside the spare chamber. The other end of the second connecting pipe passes through a through hole in the partition plate and connects to the working chamber. The first control valve is located in the first connecting pipe and can control the opening and closing of the first connecting pipe. The first one-way valve is located in the first connecting pipe and can restrict gas from passing through the first connecting pipe into the spare chamber. The second control valve is located in the second connecting pipe and can control the opening and closing of the second connecting pipe. The second one-way valve is located in the second connecting pipe and can restrict gas from passing through the second connecting pipe into the working chamber. Both the first control valve and the second control valve are electrically connected to the controller. When the heating element heats the filter element in the spare chamber, the controller can control the first control valve to open and the second control valve to close.

[0019] By adopting the above technical solution, when the heating element heats the filter element in the standby chamber, the gas released by the filter element, after catalytic decomposition, can enter the working chamber through the first connecting pipe of the exchange component, so that the filter element in the working chamber can collect the undecomposed gas released by the filter element; when the heating element heats the filter element in the working chamber, the gas released by the filter element, after catalytic decomposition, can enter the standby chamber through the second connecting pipe of the exchange component, so that the filter element in the standby chamber can collect the undecomposed gas released by the filter element, thereby realizing the gas recycling treatment and improving the efficiency and effect of waste gas treatment.

[0020] Specifically, both the workshop and the spare room have manholes on their inner walls that lead to the outside, and each manhole is sealed with a cover plate.

[0021] By adopting the above technical solution, manholes leading to the outside are opened on the inner walls of the working room and the spare room and covered with plates, which facilitates the staff to enter the working room and the spare room to perform operations such as inspection, maintenance and replacement of internal equipment, thereby improving the maintainability of the device.

[0022] In summary, this application includes the following beneficial technical effects: The device includes a housing, a partition, an air inlet pipe, an air inlet switching valve, a heating element, a controller, and two filters. The partition is located inside the housing and divides the interior into a working chamber and a backup chamber. Both the working chamber and the backup chamber have air inlets and outlets on their inner walls. One end of the air inlet pipe is connected to an exhaust gas source, and the other end has two branch air inlets. One branch air inlet connects to the air inlet of the working chamber, and the other connects to the air inlet of the backup chamber. The air inlet switching valve is located between the branch air inlet and the main air inlet and is electrically connected to the controller. The two filters are connected to the air inlets of the working chamber and the backup chamber, respectively, and are capable of filtering gases from the exhaust gas. The gas enters the mounting housing through the air inlet. The heating element is electrically connected to the controller. When the air inlet switching valve disconnects the connection between the standby chamber and the air inlet pipe and connects the working chamber to the air inlet pipe, the controller can control the heating element to heat the filter in the standby chamber, so that the filter releases the gas it has collected. When the air inlet switching valve disconnects the connection between the working chamber and the air inlet pipe and connects the standby chamber to the air inlet pipe, the controller can control the heating element to heat the filter in the working chamber. Compared with existing adsorption treatment devices, there is no need to stop the machine to replace or regenerate the adsorbent, which can realize the continuous operation of the device, avoid the problem of cumbersome operation, and will not produce secondary pollution, thus improving production efficiency. Attached Figure Description

[0023] Figure 1 This is a perspective view of a VOCs waste gas treatment device for a printing workshop according to this application; Figure 2 This is a rear view of a VOCs waste gas treatment device for a printing workshop according to this application; Figure 3 It is along Figure 2 A schematic cross-sectional view taken along the AA direction.

[0024] Reference numerals: 1. Mounting housing; 11. Working chamber; 12. Spare chamber; 13. Cover plate; 2. Partition plate; 21. Insulation layer; 3. Inlet pipe; 31. Inlet branch pipe; 4. Inlet switching valve; 5. Heating element; 6. Filter element; 61. Filter cartridge; 611. Connecting lug; 62. Filter plate; 621. Catalytic layer; 7. Outlet pipe; 71. Outlet branch pipe; 8. Outlet switching valve; 9. Exchange assembly; 91. First connecting pipe; 92. Second connecting pipe; 93. First control valve; 94. Second control valve; 95. First check valve; 96. Second check valve. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-3 Further explanation: See Figure 1 , Figure 2 and Figure 3The VOCs exhaust gas treatment device for a printing workshop provided in this application includes: a mounting housing 1, a partition 2, an inlet pipe 3, an inlet switching valve 4, an outlet pipe 7, an outlet switching valve 8, a heating element 5, a controller (not shown in the figure), an exchange component 9, and two filter elements 6. The partition 2 is disposed inside the mounting housing 1 and divides the interior of the mounting housing 1 into a working chamber 11 and a spare chamber 12. Manholes leading to the outside are opened on the inner walls of both the working chamber 11 and the spare chamber 12, and each manhole is screwed and sealed with a cover plate 13. Inlet and outlet ports leading to the outside are opened on the inner walls of both the working chamber 11 and the spare chamber 12. One end of the inlet pipe 3 is connected to the exhaust gas... The air inlet pipe 3 is connected to the power source. At the other end of the air inlet pipe 3, there are two air inlet branch pipes 31. One of the two air inlet branch pipes 31 is connected to the air inlet of the working chamber 11, and the other of the two air inlet branch pipes 31 is connected to the air inlet of the spare chamber 12. The air inlet switching valve 4 is located between the air inlet branch pipe 31 and the air inlet pipe 3 and is electrically connected to the controller. One end of the air outlet pipe 7 is connected to the outside. At the other end of the air outlet pipe 7, there are two air outlet branch pipes 71. One of the two air outlet branch pipes 71 is connected to the air outlet of the working chamber 11, and the other of the two air outlet branch pipes 71 is connected to the air outlet of the spare chamber 12. The air outlet switching valve 8 is located between the air outlet branch pipe 71 and the air outlet pipe 7.

[0026] See Figure 2 and Figure 3 Two filter elements 6 are respectively connected to the air inlets of the working chamber 11 and the spare chamber 12. The filter element 6 includes a filter cylinder 61 and a filter plate 62 made of porous material, such as zeolite or activated carbon, which can adsorb volatile organic compounds (VOCs). The filter cartridge 61 contains harmful gases such as VOCs (volatile organic compounds). A connecting lug 611 is provided at the opening of the filter cartridge 61. The opening of the filter cartridge 61 can be bolted through the connecting lug 611 to the inner wall of the mounting housing 1 and screwed onto the air inlet, creating a purified space inside the filter cartridge 61 isolated from the interior of the mounting housing 1. Each filter cartridge 61 has a mounting hole leading to the inside of the cartridge. A filter plate 62 is placed in the mounting hole and can seal it. A catalyst layer 621 is provided on the side of each filter plate 62 away from the inside of the filter cartridge 61. This catalyst layer 621 can be a nano-catalyst material (such as MnO2, CuO, or other transition metal oxides). When the filter plate 62 is heated by the heating element 5, the catalyst layer 621 can catalyze the decomposition of the gases released by the filter plate 62. The heating element 5 includes two microwave generators, each corresponding to a filter cartridge 61. Each microwave generator is located on the end of the corresponding filter cartridge 61 away from the opening and can heat the filter plate 62 on that filter cartridge 61.

[0027] See Figure 2 and Figure 3The partition 2 has an internal heat insulation layer 21, which can be made of heat insulation material, so that the heat insulation layer 21 can reduce heat transfer between the working chamber 11 and the spare chamber 12. The heat exchange assembly 9 includes a first connecting pipe 91, a second connecting pipe 92, a first control valve 93, a second control valve 94, a first check valve 95, and a second check valve 96. One end of the first connecting pipe 91 passes through a through hole in the filter plate 62 and leads to the filter cylinder 61 in the working chamber 11. The other end of the first connecting pipe 91 passes through a through hole in the partition 2 and communicates with the spare chamber 12. One end of the second connecting pipe 92 passes through the filter plate 62. The through hole on the partition 2 leads to the filter cartridge 61 inside the spare chamber 12. The other end of the second connecting pipe 92 passes through the through hole on the partition 2 and connects to the working chamber 11. The first control valve 93 is located inside the first connecting pipe 91 and can control the opening and closing of the first connecting pipe 91. The first one-way valve 95 is located inside the first connecting pipe 91 and can restrict gas from passing through the first connecting pipe 91 into the spare chamber 12. The second control valve 94 is located inside the second connecting pipe 92 and can control the opening and closing of the second connecting pipe 92. The second one-way valve 96 is located inside the second connecting pipe 92 and can restrict gas from passing through the second connecting pipe 92 into the working chamber 11.

[0028] Specifically, the first control valve 93 and the second control valve 94 can be flip valves controlled by a motor. The motor of the flip valve is located in the receiving cavity opened in the partition 2. The output shaft of the motor passes through the through hole opened in the inner wall of the receiving cavity and is connected to the flip valve.

[0029] See Figure 2 and Figure 3 The exhaust switching valve 8, intake switching valve 4, first control valve 93, second control valve 94, and two microwave generators are all electrically connected to the controller. When using the working chamber 11 to filter gas, the controller can control the intake switching valve 4 to disconnect the connection between the spare chamber 12 and the intake pipe 3 and connect the working chamber 11 to the intake pipe 3, while the exhaust switching valve 8 disconnects the connection between the spare chamber 12 and the exhaust pipe 7 and connects the working chamber 11 to the exhaust pipe 7. The controller also controls the microwave generator in the spare chamber 12 to heat the filter plate 62 in the spare chamber 12. Finally, the controller opens the first control valve 93 and closes the second control valve 94 to allow the exhaust gas source to be supplied. The exhaust gas first passes through the inlet pipe 3 into the filter cartridge 61 inside the working chamber 11, then passes through the holes on the filter plate 62 to the outside of the filter cartridge 61, and finally is discharged to the outside through the outlet pipe 7. The filter plate 62 in the spare chamber 12 will release the previously collected harmful gases after being heated. These harmful gases will first be catalyzed and decomposed by the catalyst layer 621 on the filter plate 62, then pass through the first connecting pipe 91 into the filter cartridge 61 inside the working chamber 11, then pass through the holes on the filter plate 62 to the outside of the filter cartridge 61 and be absorbed by the gas that has not been catalyzed and decomposed by the catalyst layer 621, and finally be discharged to the outside through the outlet pipe 7. When using the backup chamber 12 to filter gas, the controller can control the inlet switching valve 4 to disconnect the connection between the working chamber 11 and the inlet pipe 3 and connect the backup chamber 12 to the inlet pipe 3, while the outlet switching valve 8 disconnects the connection between the working chamber 11 and the outlet pipe 7 and connects the backup chamber 12 to the outlet pipe 7. It also controls the microwave generator in the working chamber 11 to heat the filter plate 62 within the working chamber 11. Finally, it opens the second control valve 94 and closes the first control valve 93, allowing the exhaust gas from the exhaust gas source to first pass through the inlet pipe 3 and enter the filter cartridge 6 in the backup chamber 12. In step 1, the gas passes through the holes on the filter plate 62 to the outside of the filter cylinder 61, and is finally discharged to the outside through the exhaust pipe 7. When the filter plate 62 in the working chamber 11 is heated, it releases the previously collected harmful gases. These harmful gases are first catalyzed and decomposed by the catalyst layer 621 on the filter plate 62, and then pass through the second connecting pipe 92 into the filter cylinder 61 in the spare chamber 12. They then pass through the holes on the filter plate 62 to the outside of the filter cylinder 61 and are absorbed by the gas that has not been catalyzed and decomposed by the catalyst layer 621. Finally, they are discharged to the outside through the exhaust pipe 7.

[0030] The working principle of the VOCs waste gas treatment device for a printing workshop according to this application is as follows: The housing 1 is divided into a working chamber 11 and a backup chamber 12 by a partition 2. An air inlet pipe 3 connects to the air inlets of both chambers via air inlet branch pipes 31, and the connection is controlled by an air inlet switching valve 4. Two filters 6 filter the gases entering the working chamber 11 and the backup chamber 12, respectively. When the working chamber 11 is operating, the filter 6 in the backup chamber 12 can be heated by a heating element 5 to release the collected gas for regeneration; when the backup chamber 12 is operating, the filter 6 in the working chamber 11 is heated for regeneration. Compared to existing adsorption treatment devices, this method eliminates the need for downtime for adsorbent replacement or desorption regeneration, enabling continuous operation, avoiding cumbersome operation, preventing secondary pollution, and improving production efficiency.

[0031] It should be noted that the above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A VOCs waste gas treatment device for a printing workshop, characterized in that: It includes a mounting housing (1), a partition (2), an air inlet pipe (3), an air inlet switching valve (4), a heating element (5), a controller, and two filters (6). The partition (2) is located inside the mounting housing (1) and divides the interior of the mounting housing (1) into a working chamber (11) and a spare chamber (12). Both the inner walls of the working chamber (11) and the spare chamber (12) are provided with air inlets and outlets leading to the outside. One end of the air inlet pipe (3) is connected to the exhaust gas source, and the other end of the air inlet pipe (3) is provided with two air inlet branches (31). One of the two air inlet branches (31) is connected to the air inlet of the working chamber (11), and the other of the two air inlet branches (31) is connected to the air inlet of the spare chamber (12). The intake switching valve (4) is located between the intake branch pipe (31) and the intake pipe (3) and is electrically connected to the controller; The two filters (6) are respectively connected to the air inlets of the working chamber (11) and the spare chamber (12), and are able to filter the gas entering the mounting housing (1) from the air inlets; The heating element (5) is electrically connected to the controller. When the intake switching valve (4) disconnects the connection between the spare chamber (12) and the intake pipe (3) and connects the working chamber (11) to the intake pipe (3), the controller can control the heating element (5) to heat the filter element (6) in the spare chamber (12) so that the filter element (6) releases the gas it has collected. When the intake switching valve (4) disconnects the connection between the working chamber (11) and the intake pipe (3) and connects the spare chamber (12) to the intake pipe (3), the controller can control the heating element (5) to heat the filter element (6) in the working chamber (11). The filter element (6) includes a filter cylinder (61) and a filter plate (62) made of porous material. The filter cylinder (61) has a connecting lug (611) at its opening. The opening of the filter cylinder (61) can be bolted through the connecting lug (611) to the inner wall of the mounting housing (1) and screwed onto the air inlet. This creates a purification space inside the filter cylinder (61) that is isolated from the inside of the mounting housing (1). Each filter cylinder (61) has an installation hole on its body that leads to the inside of the cylinder. The filter plate (62) is located in the installation hole and can seal the installation hole. A catalytic layer (621) is provided on the side of each filter plate (62) away from the filter cylinder (61). When the filter plate (62) is heated by the heating element (5), the catalytic layer (621) can catalytically decompose the gas released by the filter plate (62). The heating element (5) includes two microwave generators, each corresponding to a filter cylinder (61). Each microwave generator is located on the corresponding filter cylinder (61) and can heat the filter plate (62) on the filter cylinder (61).

2. The VOCs waste gas treatment device for a printing workshop according to claim 1, characterized in that: The partition (2) is provided with a heat insulation layer (21) inside, which can reduce heat transfer between the working chamber (11) and the spare chamber (12).

3. The VOCs waste gas treatment device for a printing workshop according to claim 1, characterized in that: It also includes an exhaust pipe (7) and an exhaust switching valve (8). One end of the exhaust pipe (7) is connected to the outside, and the other end of the exhaust pipe (7) is provided with two exhaust branches (71). One of the two exhaust branches (71) is connected to the exhaust port of the working chamber (11), and the other of the two exhaust branches (71) is connected to the exhaust port of the spare chamber (12). The exhaust switching valve (8) is located between the exhaust branch pipe (71) and the exhaust pipe (7). The controller is electrically connected to the exhaust switching valve (8). When the intake switching valve (4) disconnects the connection between the spare chamber (12) and the intake pipe (3), the controller can control the exhaust switching valve (8) to disconnect the connection between the spare chamber (12) and the exhaust pipe (7) and connect the working chamber (11) to the exhaust pipe (7). When the intake switching valve (4) disconnects the connection between the working chamber (11) and the intake pipe (3), the controller can control the exhaust switching valve (8) to disconnect the connection between the working chamber (11) and the exhaust pipe (7) and connect the spare chamber (12) to the exhaust pipe (7).

4. The VOCs waste gas treatment device for a printing workshop according to claim 3, characterized in that: It also includes an exchange assembly (9), which includes a first connecting pipe (91), a second connecting pipe (92), a first control valve (93), a second control valve (94), a first check valve (95), and a second check valve (96). One end of the first connecting pipe (91) passes through a through hole in the filter plate (62) and leads to the filter cylinder (61) inside the working chamber (11). The other end of the first connecting pipe (91) passes through a through hole in the partition plate (2) and connects to the spare chamber (12). One end of the second connecting pipe (92) passes through a through hole in the filter plate (62) and leads to the filter cylinder (61) inside the spare chamber (12). The other end of the connecting pipe (92) passes through the through hole opened on the partition plate (2) and communicates with the working chamber (11). The first control valve (93) is located in the first connecting pipe (91) and can control the opening and closing of the first connecting pipe (91). The first one-way valve (95) is located in the first connecting pipe (91) and can restrict gas from passing through the first connecting pipe (91) into the spare chamber (12). The second control valve (94) is located in the second connecting pipe (92) and can control the opening and closing of the second connecting pipe (92). The second one-way valve (96) is located in the second connecting pipe (92) and can restrict gas from passing through the second connecting pipe (92) into the working chamber (11). Both the first control valve (93) and the second control valve (94) are electrically connected to the controller. When the heating element (5) heats the filter element (6) in the spare chamber (12), the controller can control the first control valve (93) to open and the second control valve (94) to close.

5. A VOCs waste gas treatment device for a printing workshop according to claim 1, characterized in that: Both the inner walls of the workshop (11) and the spare room (12) are provided with manholes leading to the outside, and each manhole is sealed with a cover plate (13).

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