A VOCs pretreatment device

Abstract

The present invention discloses a VOCs pretreatment device, which relates to the technical field of waste gas catalytic purification. It includes a ventilation pipe, the bottom of the ventilation pipe is fixedly connected with a replacement box, and two communication grooves are opened on one side of the ventilation pipe close to the replacement box. Through the communication grooves, the ventilation pipe is interconnected with the replacement box. The replacement box is rotatably connected with a box door, and two magnetic guide rails are slidably connected in the replacement box along the up and down direction. An installation frame is slidably clamped in the magnetic guide rails, and the communication grooves of the ventilation pipe just enable the installation frame to pass through up and down. A catalyst layer for pretreating VOCs in the waste gas is arranged on the installation frame. In the present invention, by pushing and pulling the magnetic pull frame up and down, the replacement of the catalyst layer can be realized without stopping the machine, and through the telescopic baffle to play a role of closing and blocking, the waste gas treatment and the maintenance and regeneration treatment of the catalyst layer do not interfere with each other, so that the equipment can operate continuously, greatly improving the treatment efficiency of VOCs.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas catalytic purification, and particularly relates to a VOCs pretreatment device. Background Art

[0002] In the process of treating VOCs (volatile organic compounds), catalytic oxidation is a common pretreatment method. By arranging a catalyst layer inside the waste gas circulation pipeline, the active sites on the surface of the catalyst adsorb VOC molecules and promote their oxidation reaction with oxygen to convert VOCs into harmless carbon dioxide and water.

[0003] The catalyst does not directly "absorb" VOCs, but adsorbs VOC molecules through the active sites on its surface, promoting their oxidation reaction with oxygen. However, some by-products may be generated during the reaction, and these substances will cover the active sites on the surface of the catalyst, thereby reducing the catalytic efficiency. To ensure efficient treatment, it is usually necessary to regularly maintain and regenerate the catalyst, such as removing carbon deposits and other pollutants through cleaning or high-temperature sintering. However, during the actual operation of the equipment, replacing the catalyst layer may require shutdown, which will affect the continuous operation of VOCs pretreatment and result in low treatment efficiency. Summary of the Invention

[0004] In order to overcome the disadvantages proposed in the above background art, the present invention provides a VOCs pretreatment device.

[0005] A VOCs pretreatment device includes an air pipe. The bottom of the air pipe is fixedly connected with a replacement box. Two communication slots are opened on one side of the air pipe close to the replacement box. Through the communication slots, the air pipe is in communication with the replacement box. The replacement box is rotatably connected with a box door. Two magnetic guide rails are slidably connected in the replacement box in the up and down direction. An installation frame is slidably clamped in the magnetic guide rails. The communication slots of the air pipe just enable the installation frame to pass through up and down. A catalyst layer for pretreating VOCs in the waste gas is arranged on the installation frame. The air pipe is fixedly connected with two telescopic baffles for blocking the communication slots. The telescopic part of the telescopic baffle is provided with a wedge surface. The telescopic baffle is in extrusion fit with the installation frame on the same side through the wedge surface. A magnetic pulling frame corresponding to the magnetic guide rail is slidably connected outside the replacement box in the up and down direction. The magnetic pulling frame is magnetically attracted to the corresponding magnetic guide rail. Two locking frames are slidably connected to the inner top of the air pipe. The locking frames are used to lock the installation frame on one side. The locking frames are provided with wedge surfaces. The locking frames are in extrusion fit with the installation frame on the other side through the wedge surfaces. A first spring is fixedly connected between the locking frames and the air pipe.

[0006] As a further preferred solution, it further includes a one-way turbine pipe, which is communicated between the air pipe and the replacement box. A one-way pipe is communicated with the side of the replacement box away from the one-way turbine pipe.

[0007] As a further preferred solution, the one-way tube restricts the external air to enter the replacement box only in one direction, and the one-way turbine tube restricts the gas in the replacement box to enter the ventilation pipe only in one direction.

[0008] As a further preferred solution, it further includes a clamping block, the clamping block is fixedly connected to the box door, a clamping frame is slidably connected in the one-way tube, the clamping frame is interlocked with the clamping block, a pushing frame is fixedly connected to the one-way valve of the one-way tube, a delaying component for delaying the release of the clamping of the clamping block by the clamping frame is arranged in the one-way tube, and the clamping frame is connected to the pushing frame through the delaying component.

[0009] As a further preferred solution, the delaying component includes a tension spring, the clamping frame is slidably connected to the pushing frame, the tension spring is fixedly connected between the clamping frame and the pushing frame, a clamping rod for locking the clamping frame is slidably connected in the one-way tube in the up and down direction, and an unlocking block for releasing the locking of the clamping rod on the clamping frame is fixedly connected to the pushing frame.

[0010] As a further preferred solution, the clamping frame, the clamping rod and the unlocking block are all provided with wedge-shaped surfaces, the wedge-shaped surface of the clamping frame is in extrusion fit with the clamping block, the wedge-shaped surface of the clamping rod is in extrusion fit with the clamping frame, and the wedge-shaped surface of the unlocking block is in extrusion fit with the clamping rod.

[0011] As a further preferred solution, it further includes fixing rods symmetrically distributed along the replacement box, the fixing rods are fixedly connected to the replacement box, a guiding frame is slidably connected to the fixing rods, an inclined groove is opened on one side of the guiding frame away from the fixing rods, push rods symmetrically distributed along the replacement box are fixedly connected to the replacement box, the push rods are slidably connected to the inclined grooves of the adjacent guiding frames, the catalyst layer is rotatably connected to the adjacent mounting frame, the push rods are used to push the adjacent catalyst layer to swing towards one side, and a second spring is fixedly connected between the fixing rods and the adjacent guiding frames.

[0012] As a further preferred solution, the bottom of the magnetic guide rail contacts the adjacent guiding frame.

[0013] As a further preferred solution, opposite magnetic blocks are fixedly connected to both the mounting frame and the catalyst layer, and the opposite magnetic blocks are magnetically attracted to each other.

[0014] As a further preferred solution, it further includes at least one fixing block, the fixing block is fixedly connected to one side of the ventilation pipe close to one of the communication slots, and the fixing block is used to limit the catalyst layer on this side.

[0015] The present invention has the following advantages:

[0016] By pushing and pulling the magnetic pulling frame up and down, the present invention can replace the catalyst layer without stopping the machine, and through the telescopic baffle to play a role of closing and separating, the waste gas treatment and the maintenance and regeneration treatment of the catalyst layer do not interfere with each other, so that the equipment can operate continuously, greatly improving the treatment efficiency of VOCs.

[0017] The present invention unlocks the other mounting bracket from one side mounting bracket, and the other mounting bracket moves downward to lock the one side mounting bracket. The operation is simple and convenient, and it ensures that there is always a catalyst layer fixedly locked in the ventilation pipe, taking into account both the high efficiency of catalyst layer replacement and the effectiveness of waste gas treatment.

[0018] In the initial stage of the present invention, the box door is locked by the interlocking of the clamping frame and the clamping block, preventing the box door from being accidentally opened. After starting the turbine and after the gas in the replacement box is recovered into the ventilation pipe as fully as possible, it is automatically unlocked, and then the box door can be opened, avoiding the waste gas containing VOCs in the replacement box from being inhaled into the lungs of the staff and improving the safety of staff operation.

[0019] The present invention squeezes the adjacent guide frame to slide downward through the mounting bracket, so that the push rod pushes the catalyst layer in the replacement box to swing open to one side, so that the gas in the replacement box can quickly enter the one-way turbine pipe through the gap between the bottom of the catalyst layer and the mounting bracket, preventing the gas in the replacement box from being blocked by the catalyst layer and improving the recovery efficiency of the gas in the replacement box.

[0020] The present invention limits the right side of the left catalyst layer through the fixing block, preventing the waste gas from pushing the left catalyst layer to swing to the right and ensuring the effectiveness of the left catalyst layer in treating VOCs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0022] Figure 2 It is a three-dimensional structural schematic diagram of components such as the ventilation pipe, replacement box and mounting bracket of the present invention.

[0023] Figure 3 It is a three-dimensional structural schematic diagram of components such as the mounting bracket, telescopic baffle and locking bracket of the present invention.

[0024] Figure 4 It is a three-dimensional structural schematic diagram of components such as the mounting bracket, locking bracket and first spring of the present invention.

[0025] Figure 5 It is a three-dimensional structural schematic diagram of components such as the mounting bracket, magnetic guide rail and magnetic pulling bracket of the present invention.

[0026] Figure 6 It is a three-dimensional structural schematic diagram of components such as the catalyst layer, one-way turbine pipe and one-way pipe of the present invention.

[0027] Figure 7 It is a three-dimensional structural schematic diagram of components such as the one-way pipe, clamping block and clamping frame of the present invention.

[0028] Figure 8 It is a three-dimensional structural schematic diagram of components such as the push frame, pulling spring and clamping rod of the present invention.

[0029] Figure 9 This is a three-dimensional structural schematic diagram of components such as the card holder, card rod, and unlocking block of the present invention.

[0030] Figure 10 This is a three-dimensional structural schematic diagram of components such as the guide frame, push rod, and second spring of the present invention.

[0031] Figure 11 This is a three-dimensional structural schematic diagram of components such as the mounting rack, catalyst layer, and fixing block of the present invention.

[0032] Names and serial numbers of components in the figure: 1 - Vent pipe, 2 - Replacement box, 3 - Box door, 4 - Mounting rack, 5 - Catalyst layer, 6 - Magnetic guide rail, 7 - Telescopic baffle, 8 - Magnetic pull frame, 9 - Locking rack, 10 - First spring, 11 - One-way turbine pipe, 12 - One-way pipe, 13 - Card block, 14 - Card holder, 15 - Push frame, 16 - Pull spring, 17 - Card rod, 18 - Unlocking block, 19 - Fixed rod, 20 - Guide frame, 21 - Push rod, 22 - Second spring, 23 - Magnet, 24 - Fixing block. Specific embodiments

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Example 1: A VOCs pretreatment device, in combination with the attached Figure 1 to the attached Figure 5, including a vent pipe 1. The left end of the vent pipe 1 is connected to the upstream equipment for gas feeding, and the right end of the vent pipe 1 is connected to the downstream equipment for gas discharging. A replacement box 2 is fixedly connected to the bottom of the vent pipe 1. There are two left and right communication slots opened on one side of the vent pipe 1 close to the replacement box 2. Through the communication slots, the vent pipe 1 is interconnected with the replacement box 2. A box door 3 is rotatably connected to the front side of the replacement box 2. On both the left and right sides inside the replacement box 2, there are magnetic guide rails 6 slidably connected in the up and down direction. Inside the magnetic guide rails 6, there is an installation frame 4 slidably clamped in the front and back direction. The communication slots of the vent pipe 1 just enable the installation frame 4 to pass through up and down. A catalyst layer 5 is arranged on the installation frame 4. The catalyst layer 5 is used for catalytic oxidation pretreatment of VOCs in the waste gas. By opening the box door 3, the installation frame 4 can be pulled out forward, facilitating the removal of the catalyst layer 5 inside the replacement box 2 for maintenance and regeneration treatment. There are two left and right telescopic baffles 7 fixedly connected inside the vent pipe 1 for blocking the communication slots. The telescopic part of the telescopic baffle 7 is provided with a wedge surface. The telescopic baffle 7 is in extrusion fit with the installation frame 4 on the same side through the wedge surface. There are two left and right magnetic pulling frames 8 slidably connected in the up and down direction outside the replacement box 2. The magnetic pulling frames 8 correspond to the adjacent magnetic guide rails 6 on the same side. The magnetic pulling frames 8 are magnetically attracted and matched with the corresponding magnetic guide rails 6. On the left front side and the right rear side of the inner top of the vent pipe 1, there are two left and right lock frames 9 slidably connected in the left and right direction. One side of the lock frame 9 is used to lock the installation frame 4 on the same side. The other side of the lock frame 9 is provided with a wedge surface. The lock frame 9 is in extrusion fit with the installation frame 4 on the other side through the wedge surface. A first spring 10 is fixedly connected between the lock frame 9 and the vent pipe 1.

[0035] Directly introduce the waste gas containing VOCs from the upstream equipment into the vent pipe 1. Inside the vent pipe 1, the waste gas passes through the catalyst layer 5. The catalyst layer 5 utilizes the active sites on the catalyst surface to adsorb VOC molecules and promotes their oxidation reaction with oxygen, converting VOCs into harmless carbon dioxide and water, thereby achieving efficient decomposition pretreatment of VOCs in the waste gas. After the pretreated waste gas is discharged from the vent pipe 1, it enters the downstream equipment.

[0036] During the above pretreatment process, the catalyst layer 5 can be replaced without shutting down the machine. The specific operation is as follows: Initially, the catalyst layer 5 on the right side is locked inside the vent pipe 1. When the catalyst layer 5 inside the vent pipe 1 has worked for a period of time, push the left magnetic pulling frame 8 upward. The magnetic pulling frame 8 drives the adjacent magnetic guide rail 6 to slide upward through magnetic attraction, thereby driving the installation frame 4 thereon to move upward, and then pushing the catalyst layer 5 inside the replacement box 2 upward into the vent pipe 1. During the pushing process, the left installation frame 4 squeezes open the left telescopic baffle 7 upward. When the installation frame 4 moves upward to contact the wedge surface of the right lock frame 9 above, the installation frame 4 squeezes the right lock frame 9 to the right, and the right first spring 10 is compressed, so that the right installation frame 4 is no longer locked by the right lock frame 9.

[0037] At this time, under the action of gravity, the right mounting bracket 4, the catalyst layer 5, the magnetic guide rail 6 and the magnetic pulling bracket 8 automatically move downward. At the same time, the magnetic pulling bracket 8 on this side drives the adjacent magnetic guide rail 6 to slide downward through magnetic suction, thereby assisting in driving the mounting bracket 4 thereon to move downward. In this way, the right catalyst layer 5 in the air pipe 1 is pushed downward into the replacement box 2; during the pushing process, the right mounting bracket 4 first disengages from the wedge surface of the left locking bracket 9, and the left first spring 10 in the compressed state resets to drive the left locking bracket 9 to slide quickly to the right, so as to quickly lock the left mounting bracket 4, thus locking the left catalyst layer 5 in the air pipe 1. When the right mounting bracket 4 drives the right catalyst layer 5 to be completely pushed into the replacement box 2, the right telescopic baffle 7 in the compressed state resets, thus playing a role of closing and blocking. During the blocking period, the waste gas containing VOCs in the air pipe 1 continues to be catalytically oxidized and pretreated. The staff then opens the box door 3 to maintain and regenerate the catalyst layer 5 in the replacement box 2.

[0038] Repeat alternately every once in a while like this, so that the present invention can realize the replacement of the catalyst layer 5 without shutting down by pushing and pulling the magnetic pulling bracket 8 up and down, and through the closing and blocking function of the telescopic baffle 7, the waste gas treatment and the maintenance and regeneration treatment of the catalyst layer 5 do not interfere with each other, so that the equipment can operate continuously, greatly improving the treatment efficiency of VOCs.

[0039] In addition, the present invention unlocks the other mounting bracket 4 when one mounting bracket 4 goes up and locks the one mounting bracket 4 when the other mounting bracket 4 goes down. The operation is simple and convenient, and it is ensured that there is always a catalyst layer 5 fixed and locked in the air pipe 1, taking into account the high efficiency of the catalyst layer 5 replacement and the effectiveness of the waste gas treatment.

[0040] Embodiment 2: On the basis of Embodiment 1, in combination with the attached Figure 6 , it further includes a one-way turbine pipe 11. The one-way turbine pipe 11 is connected between the air pipe 1 and the left part of the replacement box 2. The turbine in the one-way turbine pipe 11 is used to drive the gas to flow to the left. The one-way valve in the one-way turbine pipe 11 restricts the gas in the replacement box 2 to enter the air pipe 1 only unidirectionally. The right side of the replacement box 2 is connected with a one-way pipe 12. The one-way valve in the one-way pipe 12 restricts the external air to enter the replacement box 2 only unidirectionally.

[0041] A small amount of waste gas containing VOCs may enter the replacement box 2. If the box door 3 is directly opened, it may be inhaled into the lungs of the staff, affecting the health of the staff. Therefore, before opening the box door 3, start the turbine, so that the gas in the replacement box 2 is recovered into the air pipe 1 through the one-way turbine pipe 11. At the same time, the external air enters through the one-way pipe 12, thus ensuring the fluidity of the air flow.

[0042] In combination with the attached Figure 7, also includes an L-shaped block 13, the block 13 is fixedly connected to the box door 3, a bracket 14 is slidably connected in the one-way tube 12, the bracket 14 and the block 13 are interlocked, a wedge surface is provided on the left front side of the bracket 14, the wedge surface of the bracket 14 is squeezed and matched with the block 13, a push rack 15 is fixedly connected to the left side of the one-way valve of the one-way tube 12, the push rack 15 is located in the one-way tube 12, a delay component for delaying the removal of the bracket 14 from blocking the block 13, and the bracket 14 and the push rack 15 are connected through the delay component.

[0043] Combined with Figure 8 and attached Figure 9 The delay component includes a tension spring 16, the card frame 14 is slidably connected with the push frame 15, the tension spring 16 is fixed between the card frame 14 and the push frame 15, and a card rod 17 is slidably connected in the one-way tube 12 along the up and down directions. The card rod 17 is used to lock the card frame 14, and a wedge-shaped surface is provided at the bottom of the card rod 17. The wedge-shaped surface of the card rod 17 is pressed and matched with the card frame 14. An unlocking block 18 is fixed to the push frame 15. The unlocking block 18 is used to release the locking position of the card rod 17 on the card frame 14. The left end of the unlocking block 18 is provided with a wedge-shaped surface, and the wedge-shaped surface of the unlocking block 18 is pressed and matched with the card rod 17.

[0044] In order to prevent the box door 3 from being opened accidentally, the box door 3 is initially locked by interlocking the bracket 14 and the block 13. The specific unlocking operation is as follows: when external air enters the replacement box 2 through the one-way tube 12, the one-way valve in the one-way tube 12 pushes the push bracket 15 to slide to the left. After a period of delay through the delay component, the push bracket 15 drives the bracket 14 to move to the left, thereby releasing the interlocking state between the bracket 14 and the block 13. At this time, the box door 3 can be safely opened.

[0045] The specific delay operation of the delay component is as follows: initially, the card rack 14 is clamped by the clamping rod 17, so that the push rack 15 cannot drive the card rack 14 to move synchronously to the left in the early stage, and can only slide to the left independently relative to the card rack 14, and the tension spring 16 is stretched. When the push rack 15 drives the unlocking block 18 to contact the clamping rod 17, the unlocking block 18 squeezes the clamping rod 17 upward and disengages from the card rack 14 through the wedge surface. After that, the push rack 15 can pull the card rack 14 to move synchronously to the left through the tension spring 16, thereby extending the time that the box door 3 can be opened, thereby extending the gas recovery time. In this way, the gas in the replacement box 2 can be fully recovered into the ventilation pipe 1 as much as possible, and then the box door 3 is opened, thereby improving the safety of the staff's operation.

[0046] When the turbine is closed to stop the external air from entering the replacement box 2, the one-way valve in the one-way pipe 12 drives the push frame 15 to slide to the right, causing the unlocking block 18 to disengage from the latch rod 17 to the right. The latch rod 17 slides downward and resets under the action of gravity. The push frame 15 pulls the latch frame 14 to move to the right and reset through the tension spring 16. During the process of the latch frame 14 moving to the right, it is in extrusion fit with the wedge surface of the latch rod 17, causing the latch rod 17 to re-lock the latch frame 14. When the box door 3 is closed, the box door 3 squeezes the wedge surface of the latch frame 14 through the latch block 13, causing the latch block 13 to re-lock the latch frame 14.

[0047] Combined with the attached Figure 10 It also includes fixing rods 19 symmetrically distributed along the left and right sides of the replacement box 2. The fixing rods 19 are fixedly connected to the bottom of the replacement box 2. The fixing rods 19 are slidably connected to a guide frame 20 in the up and down direction. The bottom of the magnetic guide rail 6 contacts the lower part of the adjacent guide frame 20. During the process of the magnetic guide rail 6 sliding downward, it pushes the guide frame 20 to slide downward. An inclined groove is opened on the upper side of the guide frame 20. Push rods 21 symmetrically distributed along the left and right sides of the replacement box 2 are fixedly connected to the upper front side of the replacement box 2. The push rods 21 are slidably connected to the inclined grooves of the adjacent guide frames 20. The catalyst layer 5 is rotatably connected to the adjacent mounting frame 4. The push rods 21 are used to push the adjacent catalyst layer 5 to swing inward. A second spring 22 is fixedly connected between the fixing rod 19 and the adjacent guide frame 20. Magnetic blocks 23 are fixedly connected to the front and rear parts of the lower side of the mounting frame 4 and the front and rear parts of the catalyst layer 5. The magnetic blocks 23 on the mounting frame 4 correspond to the magnetic blocks on the adjacent catalyst layer 5 one by one, and the opposite magnetic blocks 23 are magnetically attracted and matched.

[0048] During the process of recovering the gas in the replacement box 2 into the ventilation pipe 1, in order to prevent the gas in the replacement box 2 from being affected by the blocking effect of the catalyst layer 5 inside it and thus affecting the gas recovery efficiency in the replacement box 2, it is necessary to rotate and open the catalyst layer 5 in the replacement box 2. The specific operation is as follows: When the mounting frame 4 on either side moves downward to contact the adjacent guide frame 20, the mounting frame 4 squeezes the adjacent guide frame 20 to slide downward along the fixing rod 19, and the adjacent second spring 22 is compressed. The guide frame 20 squeezes the adjacent push rod 21 to slide into the replacement box 2 through the inclined groove, thereby pushing the catalyst layer 5 in the replacement box 2 to swing to one side, so that the gas in the replacement box 2 can quickly enter the one-way turbine pipe 11 through the gap between the bottom of the catalyst layer 5 and the mounting frame 4.

[0049] When the mounting frame 4 moves upward to disengage from the adjacent guide frame 20, under the action of the reset of the second spring 22, the guide frame 20 slides upward along the fixing rod 19 and squeezes the adjacent push rod 21 to slide out of the replacement box 2 through the inclined groove. At this time, under the magnetic attraction of the adjacent magnetic blocks 23 on the mounting frame 4 and the catalyst layer 5 and the action of the self-gravity of the catalyst layer 5, the catalyst layer 5 swings in the reverse direction and resets.

[0050] Combined with the attached Figure 6and appendix Figure 11 It further includes two fixing blocks 24 which are fixedly connected to one side of the inner bottom of the ventilation pipe 1 near the left communication groove. The fixing block 24 is located to the right of the left communication groove and is used to limit the catalyst layer 5 on the left side.

[0051] When the waste gas is introduced from the left side of the ventilation pipe 1, the waste gas may push the left catalyst layer 5 to the right. In the present invention, the right side of the left catalyst layer 5 is limited by the fixing block 24 to prevent the waste gas from pushing the left catalyst layer 5 to the right, ensuring the effectiveness of the left catalyst layer 5 in treating VOCs.

[0052] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes may be made therein without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A VOCs pretreatment device, comprising a ventilation pipe (1), characterized in that: The bottom of the vent pipe (1) is fixedly connected with a replacement box (2). Two communication grooves are opened on one side of the vent pipe (1) close to the replacement box (2). Through the communication grooves, the vent pipe (1) is in communication with the replacement box (2). The replacement box (2) is rotatably connected with a box door (3). Two magnetic guide rails (6) are slidably connected in the replacement box (2) in the up and down direction. An installation frame (4) is slidably clamped in the magnetic guide rail (6). The communication groove of the vent pipe (1) just enables the installation frame (4) to pass through up and down. A catalyst layer (5) for pre-treating VOCs in the waste gas is arranged on the installation frame (4). Two telescopic baffles (7) for blocking the communication groove are fixedly connected to the vent pipe (1). The telescopic part of the telescopic baffle (7) is provided with a wedge surface. The telescopic baffle (7) is in extrusion fit with the installation frame (4) on the same side through the wedge surface. A magnetic pull frame (8) corresponding to the magnetic guide rail (6) is slidably connected to the outside of the replacement box (2) in the up and down direction. The magnetic pull frame (8) is magnetically attracted to the corresponding magnetic guide rail (6). Two lock frames (9) are slidably connected to the inner top of the vent pipe (1). The lock frames (9) are used to lock one side of the installation frame (4). The lock frames (9) are provided with wedge surfaces. The lock frames (9) are in extrusion fit with the installation frame (4) on the other side through the wedge surfaces. A first spring (10) is fixedly connected between the lock frames (9) and the vent pipe (1).

2. The VOCs pretreatment device according to claim 1, wherein: It further includes a one-way turbine pipe (11). The one-way turbine pipe (11) is communicated between the vent pipe (1) and the replacement box (2). A one-way pipe (12) is communicated with one side of the replacement box (2) away from the one-way turbine pipe (11).

3. The VOCs pretreatment device according to claim 2, wherein: The one-way pipe (12) restricts the external air to enter the replacement box (2) only in one direction. The one-way turbine pipe (11) restricts the gas in the replacement box (2) to enter the vent pipe (1) only in one direction.

4. The VOCs pretreatment device according to claim 3, characterized in that: It further includes a block (13). The block (13) is fixedly connected with the box door (3). A clamping frame (14) is slidably connected in the one-way pipe (12). The clamping frame (14) is interlocked with the block (13). A push frame (15) is fixedly connected to the one-way valve of the one-way pipe (12). A delay component for delaying the release of the clamping of the block (13) by the clamping frame (14) is arranged in the one-way pipe (12). The clamping frame (14) and the push frame (15) are connected through the delay component.

5. The VOCs pretreatment device according to claim 4, characterized in that: The delay component includes a tension spring (16). The clamping frame (14) and the push frame (15) are slidably connected. The tension spring (16) is fixedly connected between the clamping frame (14) and the push frame (15). A clamping rod (17) for locking the clamping frame (14) is slidably connected in the one-way pipe (12) in the up and down direction. An unlocking block (18) for releasing the locking of the clamping frame (14) by the clamping rod (17) is fixedly connected to the push frame (15).

6. The VOCs pretreatment device according to claim 5, characterized in that: The clamping frame (14), the clamping rod (17) and the unlocking block (18) are all provided with wedge surfaces. The wedge surface of the clamping frame (14) is in extrusion fit with the block (13). The wedge surface of the clamping rod (17) is in extrusion fit with the clamping frame (14). The wedge surface of the unlocking block (18) is in extrusion fit with the clamping rod (17).

7. The VOCs pretreatment device according to claim 6, characterized in that: It further includes fixing rods (19) symmetrically distributed along the replacement box (2). The fixing rods (19) are fixedly connected to the replacement box (2). A guiding frame (20) is slidably connected to the fixing rods (19). An inclined groove is formed on one side of the guiding frame (20) away from the fixing rods (19). Push rods (21) symmetrically distributed along the replacement box (2) are fixedly connected to the replacement box (2). The push rods (21) are slidably connected to the inclined grooves of the adjacent guiding frames (20). The catalyst layer (5) is rotatably connected to the adjacent mounting frame (4). The push rods (21) are used to push the adjacent catalyst layer (5) to swing to one side. A second spring (22) is fixedly connected between the fixing rods (19) and the adjacent guiding frames (20).

8. The VOCs pretreatment device according to claim 7, characterized in that: The bottom of the magnetic guide rail (6) contacts the adjacent guiding frame (20).

9. The VOCs pretreatment device according to claim 8, characterized in that: Opposite magnetic blocks (23) are fixedly connected to both the mounting frame (4) and the catalyst layer (5), and the opposite magnetic blocks (23) are magnetically attracted and matched with each other.

10. The VOCs pretreatment device according to claim 9, characterized in that: It further includes at least one fixing block (24). The fixing block (24) is fixedly connected to one side of the air pipe (1) close to one of the communication grooves. The fixing block (24) is used to limit the catalyst layer (5) on this side.

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