Waste gas adsorption recovery device

Abstract

The present application relates to the technical field of waste gas treatment equipment and discloses a waste gas adsorption recovery device, comprising: a waste gas pipe having a horizontally arranged waste gas channel with an air inlet and an air outlet respectively provided at both ends; a fixed ring fixedly mounted on the waste gas pipe, the fixed ring being tangent to the inner bottom wall of the waste gas pipe, the fixed ring having an annular cavity therein, the outer wall of the fixed ring located in the waste gas channel being provided with an air inlet groove and an air outlet groove in sequence along the flow direction of the waste gas; push plates arranged in the annular cavity at intervals along the circumference of the fixed ring, the annular cavity being filled with activated carbon between two adjacent push plates, the push plates being provided with through holes for the passage of waste gas; an opening and closing member mounted on the push plates for opening or blocking the through holes; a control switch mounted outside the waste gas pipe, the control switch controlling the opening and closing members of the two push plates to block the through holes. The present application can balance the activated carbon adsorption load in each region, and the activated carbon utilization rate is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment equipment, and in particular to a waste gas adsorption recovery device. Background Art

[0002] During production processes in industries like chemical processing, coatings, and printing, waste gases such as volatile organic compounds (VOCs) are often generated. Direct discharge of these gases not only pollutes the environment but also wastes resources. Currently, activated carbon adsorption is widely used in waste gas recovery and treatment due to its high efficiency and cost-effectiveness.

[0003] Traditional activated carbon adsorption recovery systems typically utilize a fixed-bed structure: exhaust gas passes through an adsorption tank filled with activated carbon, where organic matter is adsorbed by the activated carbon before being discharged through the outlet. As the exhaust gas flows along a fixed path, the activated carbon near the inlet quickly becomes saturated due to exposure to high-concentration exhaust gas, forming an "adsorption dead zone." Meanwhile, the activated carbon near the outlet, due to the reduced concentration of organic matter in the exhaust gas, is underutilized, resulting in a gradual decrease in overall adsorption efficiency.

[0004] Existing technologies attempt to disturb the activated carbon layer through a stirring rod to improve distribution uniformity, but mechanical stirring will destroy the activated carbon structure and generate dust to block the air flow channel; at the same time, the contact time between the exhaust gas and the activated carbon is shortened during the stirring process, which in turn reduces the instantaneous adsorption efficiency. Summary of the Invention

[0005] In order to improve the above problems, the present application provides a waste gas adsorption recovery device.

[0006] This application provides an exhaust gas adsorption recovery device, which adopts the following technical solution:

[0007] A waste gas adsorption recovery device, comprising:

[0008] The exhaust gas pipe has a horizontal exhaust gas channel and an air inlet and an air outlet at both ends;

[0009] A fixing ring is fixedly mounted on the exhaust pipe, the fixing ring being tangent to the inner bottom wall of the exhaust pipe, the center of the fixing ring being located outside the exhaust pipe, the fixing ring having an annular cavity therein, and an outer wall of the fixing ring located within the exhaust passage being provided with an air inlet groove and an air outlet groove in sequence along the flow direction of the exhaust gas, the air inlet groove and the air outlet groove being located at the same height;

[0010] Push plates are arranged in the annular cavity at intervals along the circumference of the fixed ring, the annular cavity is filled with activated carbon between two adjacent push plates, the push plates are provided with through holes for passing exhaust gas, and the push plates can be driven to slide in the annular cavity by external force;

[0011] An opening and closing member, mounted on the push plate, for opening or closing the through hole;

[0012] A control switch is installed outside the exhaust pipe and is used to control whether the opening and closing parts are started. The control switch controls the opening and closing parts of the two push plates to block the through holes.

[0013] By adopting the above technical solution, the horizontally arranged exhaust gas pipe provides a stable exhaust gas transmission path. After the control switch closes the push plate through-holes near the air inlet and air outlet slots, the exhaust gas is forced to flow along the air inlet and air outlet slot arc section of the fixed ring, causing the exhaust gas to move along the arc direction when passing through the fixed ring, extending the contact path between the exhaust gas and the activated carbon, thereby increasing the adsorption time and improving the adsorption effect. The push plate slides and pushes the activated carbon in the annular cavity to move circumferentially, rotating new activated carbon to the air inlet and air outlet slot positions, reducing the occurrence of rapid saturation of the activated carbon at the air inlet due to high-concentration exhaust gas, balancing the adsorption load of the activated carbon in each area, and significantly improving the activated carbon utilization rate.

[0014] Optionally, the opening and closing member includes:

[0015] The inserting plate is provided with a receiving groove for sliding installation of the inserting plate, and the inserting plate is provided with a communicating hole;

[0016] A push rod, fixedly installed in the inserting plate;

[0017] A return spring is sleeved on the push rod, one end of the return spring abuts against the inner ring wall of the fixing ring, and the other end of the return spring is installed on the end of the push rod. When the return spring is in a natural elastic state, the connecting hole and the through hole are connected. When the return spring is compressed, the insert plate blocks the through hole.

[0018] By adopting the above technical solution, the spring pre-pressure ensures smooth airflow in the natural state, rigid sealing when compressed, and high sealing reliability. The use process is: control the switch to press the push rod → spring compression → plug-in plate displacement to seal the through hole; after the external force is removed, the spring resets to restore ventilation.

[0019] Optionally, an annular groove is formed on the inner ring wall of the fixing ring to allow the push rod and the return spring to extend out of the fixing ring.

[0020] By adopting the above technical solution, the annular groove on the inner ring wall of the fixed ring provides extension space for the push rod and the return spring, so that the opening and closing member can work normally.

[0021] Optionally, a driving mechanism for driving all the push plates to move synchronously is further included, and the driving mechanism includes:

[0022] A driving ring, wherein one end of the push rod extending outside the fixing ring is fixedly connected to the driving ring;

[0023] The driving member is in driving connection with the driving ring and is used for driving the driving ring to rotate intermittently.

[0024] By adopting this technical solution, the drive ring is connected to the push rod, and the driver drives the drive ring to rotate intermittently, thereby driving all push plates to move synchronously. This synchronized movement ensures uniform renewal of the activated carbon within the annular cavity, preventing untimely or excessive renewal of activated carbon in some areas. This further improves the uniformity and stability of activated carbon utilization, effectively and continuously reduces the occurrence of "adsorption dead zones," and ensures the long-term, stable and efficient operation of the exhaust gas adsorption recovery device.

[0025] Optionally, it also includes a receiving barrel coaxial with the fixed ring, which is fixedly embedded in the exhaust gas pipe, and the inner ring wall of the fixed ring outside the exhaust gas pipe is provided with a discharge trough, and the receiving barrel is provided with a feed trough, and the discharge trough is connected to the feed trough, and a sealing part for sealing the feed trough is provided in the receiving barrel, and the outer ring wall of the fixed ring outside the exhaust gas pipe is provided with a packing window.

[0026] By adopting the above technical solution, when the activated carbon in the annular cavity is saturated with adsorption, the push plate is pushed to make the saturated activated carbon fall into the receiving barrel through the discharge chute (using gravity or the thrust of the push plate). At the same time, new activated carbon can be directly added to the interval area of ​​the annular cavity through the packing window on the outer ring wall; the packing window is set on the outside of the exhaust gas pipe, and the activated carbon can be replaced without interrupting the exhaust gas treatment process; ensuring that the device can continue to treat exhaust gas during maintenance, reducing efficiency loss caused by downtime.

[0027] Optionally, the blocking member includes:

[0028] A sealing plate is rotatably mounted on the inner wall of the receiving barrel;

[0029] One end of the rotating rod is connected to the sealing plate, and the other end extends out of the material receiving barrel.

[0030] By adopting the above technical solution, the sealing member composed of the sealing plate and the rotating rod can drive the sealing plate to rotate by rotating the rotating rod, thereby realizing the opening and blocking of the feeding trough of the docking barrel.

[0031] Optionally, a material receiving frame is installed on the rotating rod, and an axial end of the material receiving barrel is provided with a through groove for allowing the material receiving frame to be drawn out.

[0032] By adopting the above technical solution, the material receiving frame and the material receiving barrel groove on the rotating rod are arranged so that after the activated carbon that has been saturated with adsorption is discharged from the discharge trough to the material receiving barrel, the activated carbon can be conveniently collected and cleaned by pulling out the material receiving frame, further improving the convenience of replacing and cleaning the activated carbon.

[0033] Optionally, the activated carbon between the push plates does not completely fill the annular cavity spacing area.

[0034] By adopting the above technical solution, the activated carbon can flow in the annular cavity interval area under the push of the push plate and realize a small range of turnover; since the fixed ring is set in an arc shape, the activated carbon will naturally accumulate on the lower push plate under the action of gravity, forming a dynamic and orderly distribution state. When the exhaust gas passes through each annular cavity interval area, it will inevitably pass through this part of the accumulated activated carbon, fully contact with the activated carbon, and after the adsorption process, it will enter the next annular cavity interval area through the through hole on the push plate. This not only ensures full contact between the exhaust gas and the activated carbon and increases the adsorption opportunity, but also further reduces the problem of local activated carbon quickly saturated to form an "adsorption dead zone" through the flow and turnover of the activated carbon, effectively improving the overall utilization rate of the activated carbon and the exhaust gas adsorption recovery effect.

[0035] In summary, this application has at least one of the following beneficial effects:

[0036] 1. The exhaust gas flows along an arc path, extending its contact time with the activated carbon. The opening and closing components work together with the control switch to control the airflow path, ensuring that the exhaust gas only passes through the effective adsorption area. The push plate pushes the activated carbon to move circumferentially, continuously refreshing the activated carbon at the air inlet and outlet slots.

[0037] 2. A packing window is provided on the outer wall of the fixed ring, and the coaxial receiving barrel cooperates with the discharge chute to form a "feed-discharge" closed-loop system, without the need to dismantle the device or interrupt the exhaust gas treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0039] Figure 2 This is a schematic diagram of the overall internal structure of the fixing ring embodied in an embodiment of the present application;

[0040] Figure 3 is a cross-sectional view of an embodiment of the present application showing a control switch pressing against a push rod;

[0041] Figure 4 This is a cross-sectional view showing the connection between the push plate and the retaining ring in the fixed ring according to an embodiment of the present application;

[0042] Figure 5 This is a structural diagram showing the coaxial installation of the receiving barrel and the fixing ring in an embodiment of the present application;

[0043] Figure 6 This is a cross-sectional view of the internal structure of the receiving barrel according to an embodiment of the present application;

[0044] Figure 7 This is a schematic diagram of an exploded view of a material receiving frame and a material receiving barrel according to an embodiment of the present application;

[0045] Figure 8 This is a schematic diagram of the cooperation between the positioning rod and the positioning block according to an embodiment of the present application.

[0046] Explanation of Reference Numerals: 100, exhaust pipe; 110, exhaust channel; 200, fixing ring; 210, air inlet groove; 220, air outlet groove; 230, annular groove; 240, discharge chute; 250, packing window; 300, push plate; 310, through hole; 320, receiving groove; 330, retaining ring; 400, opening and closing member; 410, insert plate; 411, communicating hole; 420, push rod; 430, return spring; 500, control switch; 600, driving mechanism; 610, driving ring; 611, tooth groove; 612, perforation; 620, stepping motor; 630, gear; 700, material receiving barrel; 710, material feeding chute; 720, blocking member; 721, sealing plate; 722, rotating rod; 723, supporting plate; 724, material receiving frame; 725, material blocking plate; 730, perforation; 740, positioning rod; 750, positioning block. DETAILED DESCRIPTION

[0047] The following is combined with Figure 1 -Attached Figure 8 This application is described in further detail.

[0048] The embodiment of the present application discloses a waste gas adsorption recovery device.

[0049] Reference Figure 1 and Figure 2 An exhaust gas adsorption recovery device includes a horizontally arranged exhaust gas pipe 100 in the shape of a rectangular parallelepiped. The exhaust gas pipe 100 has an air inlet and an air outlet at either end. An exhaust gas channel 110 is provided within the exhaust gas pipe 100 for the exhaust gas to flow in a straight line. A retaining ring 200 is fixedly mounted on the exhaust gas pipe 100. The exhaust gas pipe 100 defines a groove for the retaining ring 200 to fit into. The groove is wider than the width of the exhaust gas channel 110. The center of the retaining ring 200 is located outside the channel. The outer wall of the bottom of the retaining ring 200 and the inner bottom wall of the exhaust gas channel 110 are tangentially connected and fixedly connected.

[0050] Reference Figure 2The fixed ring 200 is provided with an annular cavity, and a push plate 300 is slidably mounted on the inner wall of the fixed ring 200. The push plates 300 are evenly spaced along the circumference of the fixed ring 200. The angle between the two push plates 300 in the embodiment of the present application is 30°. The annular cavity is divided into multiple areas by adjacent push plates 300, and each area is filled with activated carbon. Along the flow direction of the exhaust gas, the outer wall of the fixed ring 200 located in the exhaust gas channel 110 is sequentially provided with an air inlet groove 210 and an air outlet groove 220, and the two are at the same height, so that when the exhaust gas passes through the fixed ring 200, it cannot directly pass through the fixed ring 200, and needs to flow along the arc path of the fixed ring 200, significantly extending the contact distance between the exhaust gas and the activated carbon under the same displacement.

[0051] Reference Figure 2 and Figure 3 The portion of the push plate 300 that contacts the activated carbon has a through hole 310 for exhaust gas flow. It also includes an opening and closing member 400 that controls whether the through hole 310 of the push plate 300 is open. The opening and closing member 400 includes an insert plate 410 and a push rod 420 fixedly connected to the insert plate 410. The insert plate 410 has a connecting hole 411. The push plate 300 has a receiving groove 320. The vertical cross-section of the push plate 300 is U-shaped. The receiving groove 320 of the push plate 300 opens toward the inner wall of the fixed ring 200. The insert plate 410 is slidably mounted within the receiving groove 320 of the push plate 300. The push rod 420 extends outside the fixed ring 200. The inner wall of the fixed ring 200 has an annular groove 230 for the push rod 420 to slide along the circumference of the fixed ring 200. The push rod 420 is sheathed with a return spring 430, which is a compression spring. One end of the return spring 430 abuts against the outer wall of the fixing ring 200 , and the other end of the return spring 430 is fixedly mounted on the end of the push rod 420 .

[0052] Reference Figure 2 and Figure 3 A control switch 500 is installed outside the exhaust pipe 100 to control whether the opening and closing member 400 is activated. When the control switch 500 is not activated, the return spring 430 is in a natural state, the connecting hole 411 of the plug plate 410 is connected to the through hole 310 of the push plate 300, and the exhaust gas can pass freely. When the control switch 500 is activated, the push rod 420 is pressurized to compress the return spring 430, and the plug plate 410 moves to block the through hole 310. When the push plate 300 close to and above the outlet groove 220 and the push plate 300 close to and above the inlet groove 210 are both blocked by the through hole 310, under the action of a certain pressure drop, the exhaust gas is forced to pass only from the inlet groove 210 through the arc section of the annular cavity to the outlet groove 220.

[0053] Reference Figure 4Two adjacent push plates 300 are fixed together by a retaining ring 330. Two retaining rings 330 are provided, and the inner and outer ring walls of the retaining ring 330 are both bonded to the inner wall of the stationary ring 200. Sealing rings (not shown) are mounted on the outer and inner ring walls of the retaining ring 330. The retaining ring 330 is rotatably mounted on the inner wall of the stationary ring 200. Through holes 310 are distributed in the push plates 300 between the two retaining rings 330, so that the activated carbon is only stored between the two push plates 300 and the retaining rings 330. This prevents the portion of the push plates 300 near the annular groove 230 from coming into contact with the activated carbon, reducing the chance of the activated carbon coming into contact with the outside air.

[0054] Reference Figure 1 , and also includes a drive mechanism 600 for driving all push plates 300 to move synchronously. One end of each push rod 420 is plugged into the push plate 300. The drive member drives the drive ring 610 to rotate intermittently, so that the push plates 300 synchronously push the activated carbon to move circumferentially, refreshing the adsorbent material in the air inlet groove 210 and the air outlet groove 220 to avoid local saturation.

[0055] Specifically, refer to Figure 3 The inner ring wall of the driving ring 610 is provided with a tooth groove 611, and the driving part is a stepper motor 620. The output shaft of the stepper motor 620 is coaxially fixedly connected with a gear 630. The gear 630 is engaged with the tooth groove 611, and the gear 630 rotates intermittently, thereby driving the driving wheel to rotate synchronously.

[0056] Because the angle between adjacent push plates 300 in the embodiment of the present application is 30°, the stepper motor 620 drives the drive ring 610 to rotate 30° each time. Therefore, there are always two push rods 420 in a horizontal state, and the push plates 300 corresponding to the push rods 420 in the horizontal state are located above the air outlet groove 220 or the air inlet groove 210. The control switch 500 is a cylinder, and two cylinders are correspondingly provided. The drive ring 610 is provided with a through hole 612 for the cylinder piston rod to pass horizontally. The through hole 612 and the tooth groove 611 do not interfere with each other. The two cylinders each drive a horizontal push rod 420 to move horizontally, and the return spring 430 is compressed, so that the corresponding push plate 300 is in a state where the through hole 310 is blocked.

[0057] If the axial length of the fixing ring 200 is long, both ends of the push plate 300 are connected to push rods 420, and corresponding drive mechanisms 600 are provided. The stepper motors 620 of the two drive mechanisms 600 are opened and closed synchronously. In the embodiment of the present application, the two drive mechanisms 600 are operated synchronously.

[0058] Further, refer to Figure 5 and Figure 6The waste gas adsorption recovery device also includes a receiving barrel 700 coaxially arranged with the fixed ring 200. The receiving barrel 700 is located between the two driving rings 610. The receiving barrel 700 is coaxially fixed and embedded in the waste gas pipe 100. The outer wall of the receiving barrel 700 fits the inner wall of the fixed ring 200.

[0059] Reference Figure 6 The receiving barrel has a hollow inner wall structure. The receiving barrel 700 is located outside the exhaust pipe 100. A feed trough 710 is provided on the top of the receiving barrel 700. A sealing member 720 for blocking the feed trough 710 is provided inside the receiving barrel 700. A discharge trough 240 is provided on the top of the inner ring wall of the fixed ring 200, and the discharge trough 240 is connected to the feed trough 710. The receiving barrel 700 is usually in a state of blocking the feed trough 710, which does not affect the exhaust gas passing through the fixed ring 200. Only when the feed trough 710 is opened can the activated carbon leave the fixed ring 200 and enter the receiving barrel 700. Since the unloading action is carried out outside the exhaust pipe 100, it basically does not affect the process of the exhaust gas passing through the fixed ring 200 located in the exhaust pipe 100, and the exhaust gas can be treated normally.

[0060] Reference Figure 5 The outer wall of the retaining ring 200 is provided with a filling window 250. This filling window 250 includes a filling port and a filling window. The filling window is equipped with a rubber seal and is fastened to the retaining ring 200 via bolts (not shown). After the activated carbon between the two push plates 300 is discharged, the filling window 250 is reopened by rotating the drive ring 610 again, allowing new activated carbon to be added. This filling window 250 allows for the replenishment of new activated carbon without interrupting the process.

[0061] Reference Figure 6 The sealing member 720 includes a sealing plate 721 and a rotating rod 722. One end of the rotating rod 722 is fixedly connected to the sealing plate 721, and the other end of the rotating rod 722 is bent and extends out of the receiving barrel 700. The rotating rod 722 and the receiving barrel 700 are coaxial and the rotating rod 722 is rotatably mounted on the receiving barrel 700. A support plate 723 is also mounted on the rotating rod 722, and a receiving frame 724 is placed on the support plate 723. The sealing plate 721 controlled by the rotating rod 722 can block the feed chute 710. During unloading, the rotating rod 722 drives the sealing plate 721 to open, and the receiving port of the receiving frame 724 faces the feed chute 710. The saturated activated carbon falls into the receiving frame 724 and is drawn out from the slot 730 at the end of the receiving barrel 700 for cleaning. When replenishing the activated carbon, new activated carbon is added directly to the annular cavity through the filling window 250 outside the exhaust pipe 100 without stopping the machine.

[0062] Reference Figure 7A through slot 730 is formed at one axial end of the receiving barrel 700 for withdrawing the receiving frame 724. When the sealing plate 721 blocks the feed chute 710, the receiving frame 724 is ready to be withdrawn from the through slot 730. A retaining plate 725 is provided at the opening of the receiving frame 724. When the receiving frame 724 is withdrawn, the activated carbon can be stably located within the receiving frame 724.

[0063] Reference Figure 7 and Figure 8 Two positioning blocks 750 are provided at the other axial end of the receiving barrel 700. A positioning rod 740 is fixedly mounted on the rotating rod 722. The positioning blocks 750 define positioning slots for the positioning rods 740 to engage with. The positioning blocks 750 limit the rotational range of the rotating rod 722. When the positioning rod 740 engages the positioning slot of one positioning block 750, the sealing plate 721 seals the feed chute 710. When the positioning rod 740 engages the other positioning block 750, the activated carbon falls into the receiving frame 724.

[0064] Specifically, the activated carbon between the push plates 300 does not completely fill the annular cavity, remaining approximately 90%-95% full. Driven by the push plates 300, the activated carbon is allowed to flow and tumble, naturally depositing at low points thanks to the curved structure of the fixed ring 200, ensuring that exhaust gas evenly passes through the activated carbon layer. This structure not only optimizes and extends the exhaust gas adsorption path, but also eliminates the dead zone problem of traditional fixed beds through dynamic updates and online maintenance, significantly improving activated carbon utilization and treatment efficiency.

[0065] Exhaust gas flow must overcome resistance from the activated carbon bed and piping. The core driving force behind this flow is the mechanical energy of the fan. Install differential pressure sensors (near the inlet slot 210 and outlet slot 220 of the retaining ring 200) to detect a 15% to 20% increase in pressure drop before replacing the activated carbon. Therefore, if the pressure drop continues to increase regardless of how the retaining ring 200 is rotated, replace the activated carbon.

[0066] The implementation principle of the exhaust gas adsorption recovery device in the embodiment of the present application is as follows:

[0067] After entering the air inlet groove 210, the exhaust gas flows along the arc path of the annular cavity, which significantly extends the contact distance with the activated carbon compared to the traditional straight path, thereby improving the adsorption efficiency; the push plates 300 are distributed at intervals along the circumference of the fixed ring 200 and divide the annular cavity into areas filled with activated carbon. The push plates 300 are rotated synchronously and intermittently through the driving mechanism 600 (the stepping motor 620 drives the gear 630 to engage with the driving ring 610), pushing the activated carbon to move circumferentially and updating the adsorption material at the air inlet groove 210 and the air outlet groove 220. The receiving barrel 700 and the filling window 250 constitute an online replacement system. The push plate 300 rotates to make the saturated activated carbon fall from the discharge chute 240 into the receiving frame 724 in the receiving barrel 700, and new activated carbon is added through the filling window 250. The rotating rod 722 is used to control the sealing plate 721 to realize the opening and closing of the feed chute 710. The entire replacement process is carried out outside the exhaust pipe 100 without interrupting the treatment process; the activated carbon between the push plates 300 is filled with 90% Flow space is formed on the left and right sides, and the arc-shaped structure of the fixed ring 200 causes the activated carbon to accumulate at a low position due to gravity, thereby enhancing the gas-solid contact effect; the pressure drop between the air inlet groove 210 and the air outlet groove 220 is monitored by a pressure differential sensor, and a signal is issued when the pressure drop increases by 15% to 20% to remind personnel to manually replace the activated carbon.

[0068] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A waste gas adsorption recovery device, characterized in that: include: An exhaust gas pipe (100) has an exhaust gas channel (110) arranged horizontally, with an air inlet and an air outlet respectively arranged at both ends; A fixing ring (200) is fixedly mounted on the exhaust pipe (100), the fixing ring (200) is tangent to the inner bottom wall of the exhaust pipe (100), the center of the fixing ring (200) is located outside the exhaust pipe (100), an annular cavity is provided in the fixing ring (200), and an outer wall of the fixing ring (200) located in the exhaust passage (110) is provided with an air inlet groove (210) and an air outlet groove (220) in sequence along the flow direction of the exhaust gas, the air inlet groove (210) and the air outlet groove (220) being located at the same height; Push plates (300) are arranged in the annular cavity at intervals along the circumference of the fixed ring (200), the annular cavity is filled with activated carbon between two adjacent push plates (300), the push plates (300) are provided with through holes (310) for passing exhaust gas, and the push plates (300) can be driven to slide in the annular cavity by external force; An opening and closing member (400) is mounted on the push plate (300) and is used to open or close the through hole (310); The control switch (500) is installed outside the exhaust pipe (100) and is used to control whether the opening and closing member (400) is activated. The control switch (500) controls the opening and closing members (400) of the two push plates (300) to block the through hole (310).

2. The exhaust gas adsorption recovery device according to claim 1, characterized in that: The opening and closing member (400) comprises: The inserting plate (410) is provided with a receiving groove (320) for sliding installation of the inserting plate (410), and the inserting plate (410) is provided with a communicating hole (411); A push rod (420) is fixedly mounted in the inserting plate (410); A return spring (430) is sleeved on the push rod (420), one end of the return spring (430) abuts against the inner ring wall of the fixing ring (200), and the other end of the return spring (430) is installed on the end of the push rod (420). When the return spring (430) is in a natural elastic state, the connecting hole (411) and the through hole (310) are connected. When the return spring (430) is compressed, the inserting plate (410) blocks the through hole (310).

3. The exhaust gas adsorption recovery device according to claim 2, characterized in that: An annular groove (230) is provided on the inner ring wall of the fixing ring (200) for allowing the push rod (420) and the return spring (430) to extend out of the fixing ring (200).

4. The exhaust gas adsorption recovery device according to claim 3, characterized in that: It also includes a driving mechanism (600) for driving all the push plates (300) to move synchronously, and the driving mechanism (600) includes: A driving ring (610), and one end of the push rod (420) extending outside the fixing ring (200) is fixedly connected to the driving ring (610); A driving member is in driving connection with the driving ring (610) and is used to drive the driving ring (610) to rotate intermittently.

5. The exhaust gas adsorption recovery device according to claim 3, characterized in that: It also includes a receiving barrel (700) coaxial with the fixed ring (200), fixedly embedded in the exhaust pipe (100), the inner ring wall of the fixed ring (200) outside the exhaust pipe (100) is provided with a discharge groove (240), the receiving barrel (700) is provided with a feed groove (710), the discharge groove (240) and the feed groove (710) are connected, and a sealing member (720) for sealing the feed groove (710) is provided in the receiving barrel (700), and a filling window (250) is provided on the outer ring wall of the fixed ring (200) outside the exhaust pipe (100).

6. The exhaust gas adsorption recovery device according to claim 5, characterized in that: The blocking member (720) comprises: A sealing plate (721) is rotatably mounted on the inner wall of the receiving barrel (700); The rotating rod (722) has one end connected to the sealing plate (721) and the other end extending out of the material receiving barrel (700).

7. The waste gas adsorption recovery device according to claim 6, characterized in that: A material receiving frame (724) is mounted on the rotating rod (722), and a through slot (730) for withdrawing the material receiving frame (724) is provided at an axial end of the material receiving barrel (700).

8. The waste gas adsorption recovery device according to claim 1, characterized in that: The activated carbon between the push plates (300) does not completely fill the annular cavity spacing area.

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