VOCs pretreatment device

Abstract

The invention discloses a VOCs pretreatment device, and relates to the technical field of waste gas catalytic purification, the VOCs pretreatment device comprises a ventilation pipe, the bottom of the ventilation pipe is fixedly connected with a replacement box, one side, close to the replacement box, of the ventilation pipe is provided with two communication grooves, the ventilation pipe is communicated with the replacement box through the communication grooves, and the replacement box is rotatably connected with a box door; two magnetic guide rails are slidably connected into the replacement box in the vertical direction, a mounting frame is slidably clamped into the magnetic guide rails, the mounting frame can just penetrate through the communication groove of the ventilation pipe vertically, and a catalyst layer used for pretreating VOCs in waste gas is arranged on the mounting frame. The catalyst layer can be replaced under the non-stop condition by pushing and pulling the magnetic pull frame up and down, and waste gas treatment and maintenance and regeneration treatment of the catalyst layer do not interfere with each other through the sealing and blocking effect of the telescopic baffle, so that the equipment can work continuously, and the treatment efficiency of VOCs is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas catalytic purification, and particularly 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 flow 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, prompting 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, the catalyst usually needs to be maintained and regenerated regularly, 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 the equipment to be shut down, 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 mentioned in the above background art, the present invention provides a VOCs pretreatment device.

[0005] A VOCs pretreatment device includes a ventilation pipe. A replacement box is fixedly connected to the bottom of the ventilation pipe. Two communication slots are opened on one side of the ventilation pipe close to the replacement box. Through the communication slots, the ventilation pipe is in communication with the replacement box. A box door is rotatably connected to the replacement box. Two magnetic guide rails are slidably connected in the replacement box in the vertical direction. An installation frame is slidably clamped in the magnetic guide rails. The communication slots of the ventilation pipe just enable the installation frame to pass through vertically. A catalyst layer for pretreating VOCs in the waste gas is arranged on the installation frame. Two telescopic baffles for blocking the communication slots are fixedly connected to the ventilation pipe. A wedge surface is arranged on the telescopic part of the telescopic baffle. The telescopic baffle is in pressing 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 vertical 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 ventilation pipe. The locking frames are used to lock one side of the installation frame. A wedge surface is arranged on the locking frame. The locking frame is in pressing fit with the installation frame on the other side through the wedge surface. A first spring is fixedly connected between the locking frame and the ventilation pipe.

[0006] As a further preferred solution, it further includes a one-way turbine pipe. The one-way turbine pipe is communicated between the ventilation 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 unidirectionally, and the one-way turbine tube restricts the gas in the replacement box to enter the ventilation pipe only unidirectionally.

[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 and the clamping block are interlocked. 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. The clamping frame and the pushing frame are connected through the delaying component.

[0009] As a further preferred solution, the delaying component includes a tension spring. The clamping frame and the pushing frame are slidably connected. 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. 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. 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. 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. 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 grooves. The fixing block is used to limit the catalyst layer on this side.

[0015] The present invention has the following advantages: By pushing and pulling the magnetic pulling frame up and down, the present invention can realize the replacement of 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.

[0016] 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.

[0017] 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 accidental opening of the box door. 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 inhalation of waste gas containing VOCs in the replacement box by the staff and improving the safety of staff operation.

[0018] 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.

[0019] 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

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2 is a three-dimensional structural schematic diagram of components such as the ventilation pipe, replacement box and mounting bracket of the present invention.

[0022] Figure 3 is a three-dimensional structural schematic diagram of components such as the mounting bracket, telescopic baffle and locking bracket of the present invention.

[0023] Figure 4 is a three-dimensional structural schematic diagram of components such as the mounting bracket, locking bracket and first spring of the present invention.

[0024] Figure 5 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.

[0025] Figure 6 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.

[0026] Figure 7 is a three-dimensional structural schematic diagram of components such as the one-way pipe, clamping block and clamping frame of the present invention.

[0027] Figure 8 is a three-dimensional structural schematic diagram of components such as the push frame, pulling spring and clamping rod of the present invention.

[0028] 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.

[0029] 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.

[0030] Figure 11 This is a three-dimensional structural schematic diagram of components such as the mounting frame, catalyst layer, and fixing block of the present invention.

[0031] Names and serial numbers of components in the figure: 1 - Vent pipe, 2 - Replacement box, 3 - Box door, 4 - Mounting frame, 5 - Catalyst layer, 6 - Magnetic guide rail, 7 - Telescopic baffle, 8 - Magnetic pull frame, 9 - Lock frame, 10 - First spring, 11 - Unidirectional turbine pipe, 12 - Unidirectional 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. Detailed implementation manners

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0033] 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 an upstream device for gas feeding, and the right end of the vent pipe 1 is connected to a downstream device 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, magnetic guide rails 6 are slidably connected along the up and down direction. An installation frame 4 is slidably clamped in the magnetic guide rails 6 along 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 forward, facilitating the removal of the catalyst layer 5 in the replacement box 2 for maintenance and regeneration treatment. Two left and right telescopic baffles 7 for blocking the communication slots are fixedly connected inside 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. Two left and right magnetic pulling frames 8 are slidably connected along 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 to 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, locking frames 9 are slidably connected along the left and right direction. One side of the locking frame 9 is used for locking the installation frame 4 on the same side. The other side of the locking frame 9 is provided with a wedge surface. The locking 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 locking frame 9 and the vent pipe 1.

[0034] Directly introduce the waste gas containing VOCs from the upstream device into the vent pipe 1. Inside the vent pipe 1, the waste gas passes through the catalyst layer 5. The catalyst layer 5 uses 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 device.

[0035] During the above pretreatment process, the catalyst layer 5 can be replaced without stopping 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 in 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 locking frame 9 above, the installation frame 4 squeezes the right locking 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 locking frame 9.

[0036] 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 tension bracket 8 automatically move downward. At the same time, the magnetic tension bracket 8 on this side drives the adjacent magnetic guide rail 6 to slide downward through magnetic attraction, thereby assisting in driving the mounting bracket 4 thereon to move downward. In this way, the right catalyst layer 5 in the ventilation 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, thereby quickly locking the left mounting bracket 4. In this way, the left catalyst layer 5 is locked in the ventilation 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 sealing and blocking. During the blocking period, the waste gas containing VOCs in the ventilation 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.

[0037] Repeat alternately every once in a while like this, so that the present invention can realize the replacement of the catalyst layer 5 without stopping the machine by pushing and pulling the magnetic tension bracket 8 up and down, and through the sealing 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.

[0038] In addition, in the present invention, when one side mounting bracket 4 goes up, the other side mounting bracket 4 is unlocked, and when the other side mounting bracket 4 comes down, the one side mounting bracket 4 is locked. The operation is simple and convenient, and it is ensured that there is always a catalyst layer 5 fixed and locked in the ventilation pipe 1, taking into account the high efficiency of the catalyst layer 5 replacement and the effectiveness of the waste gas treatment.

[0039] Embodiment 2: On the basis of Embodiment 1, combined with the attached Figure 6 , it further includes a one-way turbine pipe 11. The one-way turbine pipe 11 is connected between the ventilation 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 ventilation 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.

[0040] 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 recycled into the ventilation pipe 1 through the one-way turbine pipe 11. At the same time, the external air enters through the one-way pipe 12, thereby ensuring the fluidity of the air flow.

[0041] Combined 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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 to reset under the action of gravity. The push frame 15 pulls the latch frame 14 to move to the right to 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.

[0046] Combined with the attached Figure 10 It further includes fixed rods 19 symmetrically distributed along the left and right of the replacement box 2. The fixed rods 19 are fixedly connected to the bottom of the replacement box 2. The fixed rods 19 are slidably connected with guide frames 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 formed on the upper side of the guide frame 20. Push rods 21 symmetrically distributed along the left and right 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 with the inclined grooves of the adjacent guide frames 20. The catalyst layer 5 is rotatably connected with 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 fixed 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.

[0047] 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 therein and 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 any 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 fixed 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.

[0048] When the mounting frame 4 moves upward to disengage from the adjacent guide frame 20, under the reset action of the second spring 22, the guide frame 20 slides upward along the fixed 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 back to reset.

[0049] Combined with the attached Figure 6and appendices 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 left catalyst layer 5.

[0050] 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 and ensure the effectiveness of the left catalyst layer 5 in treating VOCs.

[0051] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that these embodiments can be changed without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A VOCs pretreatment device, comprising a vent pipe (1), characterized in that: A replacement box (2) is fixedly connected to the bottom of the ventilation pipe (1). Two connecting grooves are formed on one side of the ventilation pipe (1) close to the replacement box (2). The ventilation pipe (1) and the replacement box (2) are connected to each other through the connecting grooves. The replacement box (2) is rotatably connected to a box door (3). Two magnetic guide rails (6) are slidably connected to the replacement box (2) in an up-and-down direction. A mounting frame (4) is slidably connected to the magnetic guide rails (6). The connecting groove of the ventilation pipe (1) just allows the mounting frame (4) to pass through in an up-and-down direction. A catalyst layer (5) for pre-treating VOCs in exhaust gas is arranged on the mounting frame (4). The ventilation pipe (1) is fixedly connected to two telescopic baffles for blocking the connecting grooves. (7), the telescopic portion of the telescopic baffle (7) is provided with a wedge-shaped surface, and the telescopic baffle (7) is pressed and matched with the mounting frame (4) on the same side through the wedge-shaped surface. The outer edge of the replacement box (2) is slidably connected to a magnetic pull frame (8) corresponding to the magnetic guide rail (6) in the up-down direction, and the magnetic pull frame (8) is magnetically matched with the corresponding magnetic guide rail (6). Two locking frames (9) are slidably connected to the top of the ventilation pipe (1), and the locking frames (9) are used to lock the mounting frame (4) on one side. The locking frames (9) are provided with a wedge-shaped surface, and the locking frames (9) are pressed and matched with the mounting frame (4) on the other side through the wedge-shaped surface. A first spring (10) is fixedly connected between the locking frame (9) and the ventilation pipe (1).

2. A VOCs pretreatment device according to claim 1, characterized in that: It also includes a one-way turbine pipe (11), which is connected between the ventilation pipe (1) and the replacement box (2), and a one-way pipe (12) is connected to a side of the replacement box (2) away from the one-way turbine pipe (11).

3. A VOCs pretreatment device according to claim 2, characterized in that: The one-way pipe (12) restricts external air from entering the replacement box (2) in one direction only, and the one-way turbine pipe (11) restricts the gas in the replacement box (2) from entering the ventilation pipe (1) in one direction only.

4. A VOCs pretreatment device according to claim 3, characterized in that: The invention also comprises a clamping block (13), the clamping block (13) is fixedly connected to the box door (3), a clamping frame (14) is slidably connected in the one-way tube (12), the clamping frame (14) and the clamping block (13) are interlocked, a one-way valve of the one-way tube (12) is fixedly connected to a push frame (15), a delay component for delaying the clamping of the clamping frame (14) to the clamping block (13) is arranged in the one-way tube (12), and the clamping frame (14) and the push frame (15) are connected via the delay component.

5. A VOCs pretreatment device according to claim 4, characterized in that: The delay assembly includes a tension spring (16), the card frame (14) and the push frame (15) are slidably connected, the tension spring (16) is fixed between the card frame (14) and the push frame (15), a card rod (17) for locking the card frame (14) is slidably connected in the one-way tube (12) along the up-down direction, and an unlocking block (18) for releasing the card rod (17) from locking the card frame (14) is fixed to the push frame (15).

6. A VOCs pretreatment device according to claim 5, characterized in that: The card frame (14), the card rod (17) and the unlocking block (18) are all provided with wedge-shaped surfaces; the wedge-shaped surface of the card frame (14) is pressed and fitted with the card block (13); the wedge-shaped surface of the card rod (17) is pressed and fitted with the card frame (14); and the wedge-shaped surface of the unlocking block (18) is pressed and fitted with the card rod (17).

7. A VOCs pretreatment device according to claim 6, characterized in that: The invention also comprises fixed rods (19) symmetrically distributed along the replacement box (2), the fixed rods (19) being fixedly connected to the replacement box (2), the fixed rods (19) being slidably connected to a guide frame (20), a side of the guide frame (20) away from the fixed rods (19) being provided with an oblique groove, the replacement box (2) being fixedly connected to push rods (21) symmetrically distributed along the replacement box (2), the push rods (21) being slidably connected to the adjacent guide frame (20) oblique groove, the catalyst layer (5) being rotatably connected to the adjacent mounting frame (4), the push rods (21) being used to push the adjacent catalyst layer (5) to swing toward one side, and a second spring (22) being fixedly connected between the fixed rods (19) and the adjacent guide frame (20).

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

9. A VOCs pretreatment device according to claim 8, characterized in that: The mounting frame (4) and the catalyst layer (5) are both fixedly connected with relative magnetic blocks (23), and the relative magnetic blocks (23) are magnetically engaged.

10. A VOCs pretreatment device according to claim 9, characterized in that: It also comprises at least one fixing block (24), the fixing block (24) being fixedly connected to one side of the ventilation pipe (1) close to one of the connecting grooves, and the fixing block (24) being used to limit the position of the catalyst layer (5) on that side.

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