A multi-stage tank type exhaust gas purification and recovery device

Abstract

The present application relates to the field of environmental protection technology, particularly relates to a kind of multistage tank type waste gas purification recovery device, including purification tank, the side center of purification tank is rotatably installed with central shaft, the outer end of central shaft is connected with several groups of support pipe, the outer end of support pipe is connected with filter plate assembly, the two sides of purification tank are respectively provided with gas inlet pipe and gas outlet pipe, the end of gas inlet pipe and gas outlet pipe corresponding purification tank is connected and communicated with several manifold, the manifold on gas inlet pipe is equipped with electric valve to control access opening and closing, the nozzle in the manifold located in purification tank is connected with gas guide cylinder, sealing assembly is provided on purification tank, backflushing assembly is provided on purification tank.The present application is equipped with filter plate assembly, when waste gas purification operation is carried out, the type of waste gas can be guided to the corresponding filter plate assembly, so that different waste gas is subjected to adaptive purification treatment, to avoid the problem of poor purification effect caused by the incompatibility of filter filler and waste gas type.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection technology, and in particular to a multi-stage tank type waste gas purification and recovery device. BACKGROUND

[0002] In the process of waste gas treatment, filter filler is needed to capture particulate matter in waste gas and adsorb impurities such as sulfides in waste gas, so as to purify the waste gas.

[0003] The existing patent number CN106540496B proposes a waste gas purification device capable of making the exhaust gas discharged from a direct injection type gasoline engine uniformly flow into the end face of a plugged honeycomb structure, and efficiently removing particulate matter. The waste gas purification device has a honeycomb catalyst body, a plugged honeycomb structure, and a tank body that houses the honeycomb catalyst body and the plugged honeycomb structure inside, and the plugged honeycomb structure arranged at a position downstream of the honeycomb catalyst body is designed to have a pressure loss of at least one of the center area of the end face of the second inflow side end face and the second outflow side end face of the second honeycomb substrate larger than the pressure loss of the end face peripheral area around the center area.

[0004] The above-mentioned waste gas purification device purifies and filters the waste gas by uniformly distributing the filter material in the tank body. However, during actual use, when the waste gas purification equipment is used for a certain period of time, the filter filler in the equipment needs to be replaced. The above-mentioned equipment needs to be stopped during operation, which causes the problem that the waste gas is difficult to treat for a certain period of time. In addition, the filter filler in the equipment is used at a high intensity, which reduces the service life. When the use environment is complex and the types of waste gas to be treated are more, the above-mentioned equipment cannot be adjusted according to the types of waste gas under the premise of not stopping to replace the filter filler, which makes the filtering effect poor.

[0005] Therefore, a multi-stage tank type waste gas purification and recovery device is proposed. SUMMARY

[0006] In order to overcome the shortcomings of the prior art, the present application provides a multi-stage tank type waste gas purification and recovery device.

[0007] To solve the above technical problems, the present application provides the following technical solutions: a multi-stage tank type waste gas purification and recovery device, comprising a purification tank, a central shaft is rotatably installed at the center of the side surface of the purification tank, a plurality of groups of support pipes are connected to the outer end of the central shaft, a plurality of filter plate assemblies are connected to the outer end of the support pipes, a plurality of filter fillers for treating different waste gases are respectively arranged in the plurality of filter plate assemblies, a gas inlet pipe and a gas outlet pipe are respectively arranged on the two side surfaces of the purification tank, the gas inlet pipe is used for connecting a waste gas pipeline, the gas outlet pipe is used for connecting an air extraction pipeline, a plurality of manifolds are connected and communicated with one end of the purification tank corresponding to the gas inlet pipe and the gas outlet pipe, the manifolds penetrate the side surface of the purification tank, the manifolds on the gas inlet pipe are provided with electric valves for controlling the opening and closing of the passages, the number of the manifolds is half of the number of the groups of support pipes and is staggered with the filter plate assemblies, a gas guide cylinder is connected to the port of the manifold in the purification tank, the filter plate assembly at the corresponding position of the gas guide cylinder corresponds, a sealing assembly for controlling the filter plate assembly and the corresponding position of the gas guide cylinder is arranged on the purification tank, a back flushing assembly is arranged on the purification tank, and the back flushing assembly discharges a gas flow in the opposite direction of the waste gas inlet direction into the purification tank.

[0008] As a preferred technical solution of the present application, the filter plate assembly comprises a filter cylinder, the filter cylinder is connected to the support pipe, a connecting shaft is connected to the center of the filter cylinder, threads are formed on the connecting shaft, and side plates are threadedly connected to both ends of the connecting shaft, a plurality of filler plates are threadedly connected in the connecting shaft, and filter fillers are filled in the filler plates.

[0009] As a preferred technical solution of the present application, the sealing assembly comprises a ring setting cylinder, the ring setting cylinder is connected to the outer wall of the filter cylinder, a fluid groove is formed in the center of the ring setting cylinder, a convex fan groove is formed in the two side surfaces of the ring setting cylinder, a fluid hole is formed in the side surface of the fluid groove and communicated with the convex fan groove, a plug rod is sleeved in the convex fan groove, one end of the plug rod located outside the convex fan groove is connected with a sleeve, the sleeve is provided with a ring groove on one side corresponding to the ring setting cylinder and sleeved with the ring setting cylinder, a sealing ring is connected to the outer wall of the sleeve, the outer wall of the sleeve is matched with the inner wall of the gas guide cylinder, a circulating pipe is connected to both ends of the central shaft through flange bearings, a through hole communicated with the fluid groove is formed in the central shaft and the support pipe, a liquid injection cylinder is connected and communicated on the circulating pipe, a telescopic motor is mounted on the liquid injection cylinder, a piston is connected to the transmission shaft of the telescopic motor, the piston is sleeved in the liquid injection cylinder, fluid medium is filled in the central shaft, the support pipe, the fluid groove, the circulating pipe and the liquid injection cylinder, the number of each group of support pipes is two, the central shaft is blocked between the two support pipes of each group in the inside, a circulating pump is mounted on the circulating pipe, and a heat dissipation fin is mounted on one side of the circulating pipe at the air inlet end of the circulating pump.

[0010] As a preferred technical scheme of the present application, the back flushing assembly comprises a heat insulation cylinder, the heat insulation cylinder is sleeved on the circulating pipe and the heat dissipation fins are located inside, the fan is installed on the purification tank, the exhaust port of the fan is connected and communicated with the heat insulation cylinder, the air guide ring cylinder is connected in the purification tank, the back flushing pipe is connected and communicated on the air guide ring cylinder, the free end of the back flushing pipe penetrates the purification tank, the free end of the back flushing pipe is connected and communicated with the heat insulation cylinder, the back flushing disc is connected and communicated at the position corresponding to the standby position on the side surface of the air guide ring cylinder, the long hole is formed on the bottom surface of the purification tank, the collecting disc is connected in the long hole, the outer wall of one end of the center shaft located outside the purification tank is connected with the sleeve plate, the sleeve plate is connected with the wrench handle, the limiting ring in the shape of a sector is connected on the side surface of the purification tank, and the wrench handle is inserted into the limiting ring.

[0011] As a preferred technical scheme of the present application,

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] 1. By arranging the filter plate assembly, during the waste gas purification operation, the waste gas can be guided to the corresponding filter plate assembly according to the type of the waste gas, so that the waste gas is adaptively purified for different waste gas, avoiding the problem of poor purification effect caused by the inadaptation of the filter filler and the type of the waste gas, and avoiding the problem of low efficiency caused by the reloading of the filter filler. In addition, when the filter filler needs to be replaced, the equipment can be operated without stopping to operate the filter plate assembly in the standby position, thereby ensuring the stability of the waste gas cleaning system.

[0014] 2. By arranging the center shaft, the filter plate assemblies in the working position and the standby position can be switched during the filtration period, and the particles are blown away by the back flushing assembly periodically, so that the particles are settled in the purification tank. First, the recovery and treatment of the particles are facilitated, and the filter plate assembly is cleaned, thereby prolonging the service life of the waste gas purification and improving the service life of the filter plate assembly.

[0015] 3. By arranging the manifold, the waste gas can be concentrated and guided, so that the waste gas is in full contact with the filter plate assembly, avoiding the problem that the particles are not uniformly distributed due to insufficient contact between the filter filler and the waste gas, thereby preventing the local blockage of the filter plate assembly from affecting the filtration and purification effect.

[0016] 4. By arranging the sealing assembly, during the filtration and purification of the waste gas, the filter plate assembly can be sleeved on the air guide cylinder, thereby ensuring the sealing performance of the waste gas flow, and avoiding the problem that the treatment effect is reduced due to the waste gas overflow.

[0017] 5. By arranging the support pipe, the fluid medium will pass through the fluid groove when circulating, thereby guiding the heat in the fluid groove out, cooling the waste gas, and preventing the damage of high temperature to the filter plate assembly.

[0018] 6、Through the setting of the back-blowing assembly, the air flow is used to pass through the radiating fins and exchange heat with the fluid medium in the circulating pipe, the flowing air is used to increase the heat exchange efficiency, thereby improving the cooling efficiency of the fluid medium, the particles on the filter plate assembly are blown away, the particles are dried by the hot air, the particles are more easily stripped from the filter filler, meanwhile, the hot air keeps the purification tank in a dry state, and the particles are more easily settled rather than adhered in the purification tank. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a front side structure schematic diagram of the present application;

[0020] Figure 2 It is a rear side structure schematic diagram of the present application;

[0021] Figure 3 It is an internal structure schematic diagram of the purification tank of the present application;

[0022] Figure 4 It is a side structure schematic diagram of the ring setting cylinder of the present application;

[0023] Figure 5 It is a cross-sectional structure schematic diagram of the ring setting cylinder of the present application;

[0024] Figure 6 It is a top side part structure schematic diagram of the present application;

[0025] Figure 7 It is a structure schematic diagram of the plate moving handle of the present application.

[0026] Wherein: 10, purification tank; 11, center shaft; 12, support pipe; 13, air inlet pipe; 14, air outlet pipe; 15, manifold; 16, air guide cylinder; 17, electric valve; 18, filter cylinder; 19, connecting shaft; 20, filler plate; 21, side plate; 22, ring setting cylinder; 23, fluid groove; 24, convex fan groove; 25, insertion rod; 26, sleeve; 27, circulating pipe; 28, liquid injection cylinder; 29, telescopic motor; 30, piston; 31, circulating pump; 32, radiating fin; 33, fan; 34, heat insulation cylinder; 35, back-blowing pipe; 36, air guide ring cylinder; 37, back-blowing disc; 38, collection disc; 39, sleeve plate; 40, pulling handle; 41, limiting ring. DETAILED DESCRIPTION

[0027] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0028] Example: Figures 1-7 As shown, a multi-stage tank-type waste gas purification and recovery device includes a purification tank 10. A central shaft 11 is rotatably mounted on the side center of the purification tank 10. Several sets of support pipes 12 are connected to the outer end of the central shaft 11. The several sets of support pipes 12 are arranged in a ring. Filter plate assemblies are connected to the outer ends of the support pipes 12. Filter packing for treating different waste gases is respectively arranged in the filter plate assemblies. Inlet pipes 13 and outlet pipes 14 are respectively arranged on both sides of the purification tank 10. The inlet pipe 13 is used to connect to the waste gas pipeline, and the outlet pipe 14 is used to connect to the extraction pipeline. The waste gas pipeline is the pipeline for waste gas transmission, and the extraction pipeline is the pipeline connected to the extraction equipment. Both are existing known technologies and will not be described in detail here. The inlet pipe 13 and outlet pipe 14 correspond to one of the purification tank 10. Several manifolds 15 are connected and intersected at the end. The manifolds 15 pass through the side of the purification tank 10. An electric valve 17 is installed on the manifolds 15 on the air inlet pipe 13 to control the opening and closing of the passage. The number of manifolds 15 is half the number of support pipes 12 and they are staggered with the filter plate assembly. The port of the manifold 15 located in the purification tank 10 is connected to an air guide cylinder 16. The filter plate assembly at the corresponding position of the air guide cylinder 16 is corresponding. The position corresponding to the center of the two air guide cylinders 16 is the working position, and the position corresponding to one side of the air guide cylinder 16 is the standby position. The purification tank 10 is provided with a sealing assembly for controlling the fit between the filter plate assembly and the corresponding air guide cylinder 16. The purification tank 10 is provided with a backflush assembly, which discharges airflow into the purification tank 10 in the opposite direction to the exhaust gas inlet direction.

[0029] Specifically, the inlet pipe 13 and the outlet pipe 14 are connected to the exhaust pipe and the suction pipe respectively, according to the type of exhaust gas, the filter plate assembly for treating the exhaust gas is selected, then the electric valve 17 corresponding to the selected filter plate assembly is opened, after the suction equipment is started, the exhaust gas first passes through the inlet pipe 13, then passes through the corresponding manifold 15 according to the opened electric valve 17, and is filtered and purified by the filter plate assembly, then the purified exhaust gas is sucked out by the suction equipment through the outlet pipe 14, and is subjected to subsequent treatment or directly discharged, after a certain period of exhaust gas treatment or the filter plate assembly is blocked, the sealing assembly dismounts the filter plate assembly from the sleeve of the air guide cylinder 16, drives the central shaft 11 to rotate, the filter plate assembly rotates with the central shaft 11, the filter plate assembly in the working position enters the standby position, and the filter plate assembly in the standby position enters the working position, then the sealing assembly drives the filter plate assembly in the working position to sleeve the air guide cylinder 16, and continues the exhaust gas filtering and purification work, the back flushing assembly is started at a certain frequency, discharges the air flow in the opposite direction of the exhaust gas inlet direction in the purification tank 10, uses the air flow to blow the particulate matter filtered in the filter plate assembly away, and the particulate matter flows with the air flow and is deposited in the purification tank 10 when the back flushing assembly stops starting.

[0030] As shown in Figure 5 , the filter plate assembly comprises a filter cylinder 18, the filter cylinder 18 is connected to the support pipe 12, the filter cylinder 18 is connected with a connecting shaft 19 in the center, threads are formed on the connecting shaft 19, and side plates 21 are threadedly connected to both ends of the connecting shaft 19, a plurality of filler plates 20 are threadedly connected in the connecting shaft 19, the filler plates 20 are filled with filter filler, and it should be noted that the filter filler is fixed by a cover plate or a steel wire and the like on the side surface of the filler plate 20, which is a known technology and will not be described here.

[0031] Specifically, by arranging filler plates 20 with different numbers and different filter fillers in the filter cylinder 18, a corresponding filtering process is formulated for different types of exhaust gas, and multi-stage filtering is realized while the filtering effect is improved.

[0032] As shown in Figure 2 and Figure 6As shown, the sealing assembly comprises a ring cylinder 22 connected to the outer wall of the filter cylinder 18, a fluid groove 23 is formed in the center of the ring cylinder 22, two convex fan grooves 24 are formed on both sides of the ring cylinder 22, the convex fan groove 24 is a fan-shaped groove and the vertical section is in the shape of a convex, a fluid hole is formed in the side of the fluid groove 23 and is communicated with the convex fan groove 24, a convex-shaped insertion rod 25 is sleeved in the convex fan groove 24, the insertion rod 25 and the convex fan groove 24 are sealed, one end of the insertion rod 25 located outside the convex fan groove 24 is connected with a sleeve 26, the sleeve 26 is sleeved with the ring cylinder 22 and is provided with an annular groove on one side of the ring cylinder 22, the outer wall of the sleeve 26 is connected with a sealing ring, the outer wall of the sleeve 26 is matched with the inner wall of the air guide cylinder 16, the outer edge of the sleeve 26 is provided with a round corner, the both ends of the central shaft 11 are connected with a circulating pipe 27 in the shape of C through flange bearings, the central shaft 11 and the supporting pipe 12 are both provided with through holes communicated with the fluid groove 23, a liquid injection cylinder 28 is connected and communicated on the circulating pipe 27, a telescopic motor 29 is installed on the liquid injection cylinder 28, a piston 30 is connected with the transmission shaft of the telescopic motor 29, the piston 30 is sleeved in the liquid injection cylinder 28, the central shaft 11, the supporting pipe 12, the fluid groove 23, the circulating pipe 27 and the liquid injection cylinder 28 are all filled with fluid medium, it should be noted that the fluid medium is a fluid that can absorb heat, including water, in addition, a spring assembly (not shown in the figure) is arranged between the ring cylinder 22 and the sleeve 26 for resetting.

[0033] Specifically, the transmission shaft of the telescopic motor 29 is controlled to extend out, the piston 30 pushes out the fluid medium in the liquid injection cylinder 28, the fluid groove 23 is filled with the fluid medium through the fluid hole due to the increase of the fluid medium in the fluid groove 23, and the insertion rod 25 is pushed out, the sleeve 26 is pushed out, and the sleeve 26 is inserted into the air guide cylinder 16, thereby realizing the sealing between the ring cylinder 22 and the air guide cylinder 16, when it is necessary to switch the filter plate assembly, the transmission shaft of the telescopic motor 29 is controlled to retract, the ring cylinder 22 is retracted by the pulling of the spring and separated from the air guide cylinder 16.

[0034] As Figure 5 and Figure 6 shown, the number of each group of supporting pipes 12 is two, the central shaft 11 is blocked between the two supporting pipes 12 of each group, a circulating pump 31 is installed on the circulating pipe 27, and a heat sink 32 is installed on one side of the circulating pump 31.

[0035] Specifically, the circulating pipe 27 is started to make the fluid medium flow in the central shaft 11 and the circulating pipe 27, the flowing fluid medium enters through one supporting pipe 12 of each group and then flows out through the other supporting pipe 12, so that the heat in the fluid groove 23 is conducted out, and the fluid medium is cooled by heat exchange with the outside when passing through the heat sink 32.

[0036] AsFigure 2 and Figure 3 As shown, the backflush assembly includes a heat insulation cylinder 34, which is sleeved on the circulation pipe 27 and has heat sink 32 located inside. A fan 33 is installed on the purification tank 10. The exhaust port of the fan 33 is connected to and communicates with the heat insulation cylinder 34. An air guide ring cylinder 36 is connected inside the purification tank 10. A backflush pipe 35 is connected to and communicates with the air guide ring cylinder 36. The free end of the backflush pipe 35 passes through the purification tank 10 and is connected to and communicates with the heat insulation cylinder 34. A backflush disc 37 is connected to and communicates with the side of the air guide ring cylinder 36 at the position corresponding to the standby position.

[0037] Specifically, when the fan 33 starts, it draws in air and discharges it through the backflush pipe 35. When the air passes through the heat sink 32, it exchanges heat with the fluid medium. The flow of air increases the efficiency of heat exchange. Then, the hot air flows through the air guide ring 36 and the backflush disc 37 to the filter plate assembly in the standby position. While blowing away the particles on the filter plate assembly, the hot air dries the particles, making it easier for the particles to peel off from the filter media. At the same time, the hot air keeps the purification tank 10 dry, making it easier for the particles to settle rather than adhere to the purification tank 10.

[0038] like Figure 2 As shown, the bottom surface of the purification tank 10 has an elongated hole, and a collection tray 38 is connected inside the elongated hole.

[0039] Specifically, the particles that settle in the purification tank 10 are collected in the collection tray 38 for easy collection and recycling.

[0040] like Figure 7 As shown, a sleeve plate 39 is connected to the outer wall of one end of the central shaft 11 outside the purification tank 10. A lever handle 40 is connected to the sleeve plate 39. A fan-shaped limiting ring 41 is connected to the side of the purification tank 10. The lever handle 40 is inserted into the limiting ring 41. The inner wall of the limiting ring 41 is at a certain angle, specifically 360° divided by the number of filter plate assemblies.

[0041] Specifically, by actuating the handle 40, the central shaft 11 can be rotated, thereby switching the filter plate assembly between the working position and the standby position. The limiting ring 41 restricts the rotation angle of the central shaft 11 so that the rotation angle of the central shaft 11 can be adapted to the position switching of the filter plate assembly.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A multi-stage tank-type waste gas purification and recovery device, comprising a purification tank (10), characterized in that, A central shaft (11) is rotatably mounted on the side center of the purification tank (10). Several sets of support pipes (12) are connected to the outer end of the central shaft (11). Filter plate assemblies are connected to the outer ends of the support pipes (12). Filter packing for treating different waste gases is respectively installed in the filter plate assemblies. An air inlet pipe (13) and an air outlet pipe (14) are respectively installed on both sides of the purification tank (10). The air inlet pipe (13) is used to connect to the waste gas pipeline, and the air outlet pipe (14) is used to connect to the exhaust pipeline. Several manifolds (15) are connected to one end of the purification tank (10) corresponding to the air inlet pipe (13) and the air outlet pipe (14). The manifolds (15) pass through... On the side of the purification tank (10), an electric valve (17) is installed on the manifold (15) on the air inlet pipe (13) to control the opening and closing of the passage. The number of manifolds (15) is half the number of support pipes (12) and they are staggered with the filter plate assembly. The port of the manifold (15) inside the purification tank (10) is connected to the air guide cylinder (16). The filter plate assembly at the corresponding position of the air guide cylinder (16) is corresponding. A sealing assembly is provided on the purification tank (10) to control the filter plate assembly and the corresponding position of the air guide cylinder (16). A backflush assembly is provided on the purification tank (10). The backflush assembly discharges airflow in the opposite direction to the exhaust gas inlet into the purification tank (10). The filter plate assembly includes a filter cylinder (18), which is connected to a support tube (12). A connecting shaft (19) is connected to the center of the filter cylinder (18). The connecting shaft (19) is threaded and has side plates (21) threaded at both ends. Several packing plates (20) are threaded inside the connecting shaft (19), and the packing plates (20) are filled with filter packing. The sealing assembly includes an annular cylinder (22), which is connected to the outer wall of the filter cartridge (18). A fluid groove (23) is provided in the center of the annular cylinder (22). A convex fan groove (24) is provided on both sides of the annular cylinder (22). A fluid hole communicating with the convex fan groove (24) is provided on the side of the fluid groove (23). An insert rod (25) is sleeved inside the convex fan groove (24). A sleeve (26) is connected to one end of the insert rod (25) outside the convex fan groove (24). An annular groove is provided on one side of the sleeve (26) corresponding to the annular cylinder (22) and sleeved with the annular cylinder (22). A sealing ring is connected to the outer wall of the sleeve (26). 6) The outer wall of the air guide tube (16) is adapted to the inner wall of the air guide tube (16). The two ends of the central shaft (11) are connected to the circulation tube (27) through the flange bearing. The central shaft (11) and the support tube (12) are provided with through holes that communicate with the fluid tank (23). The circulation tube (27) is connected to and communicates with the injection tube (28). The injection tube (28) is equipped with a telescopic motor (29). The drive shaft of the telescopic motor (29) is connected to the piston (30). The piston (30) is sleeved inside the injection tube (28). The central shaft (11), the support tube (12), the fluid tank (23), the circulation tube (27) and the injection tube (28) are all filled with fluid medium. The number of support tubes (12) in each group is two. The interior of the central shaft (11) is sealed between the two support tubes (12) in each group. A circulation pump (31) is installed on the circulation tube (27). A heat sink (32) is installed on one side of the air inlet end of the circulation pump (31) on the circulation tube (27). The backflush assembly includes a heat insulation cylinder (34), which is sleeved on the circulation pipe (27) and has heat sinks (32) inside. A fan (33) is installed on the purification tank (10), and the exhaust port of the fan (33) is connected to and communicates with the heat insulation cylinder (34). An air guide ring cylinder (36) is connected inside the purification tank (10), and a backflush pipe (35) is connected to and communicates with the air guide ring cylinder (36). The free end of the backflush pipe (35) passes through the purification tank (10), and the free end of the backflush pipe (35) is connected to and communicates with the heat insulation cylinder (34). A backflush disc (37) is connected to and communicates with the side of the air guide ring cylinder (36) corresponding to the position of the standby position.

2. The multi-stage tank-type waste gas purification and recovery device according to claim 1, characterized in that, The bottom surface of the purification tank (10) is provided with an elongated hole, and a collection tray (38) is connected inside the elongated hole.

3. The multi-stage tank-type waste gas purification and recovery device according to claim 2, characterized in that, The outer wall of the central shaft (11) located outside the purification tank (10) is connected to a sleeve plate (39), and a lever handle (40) is connected to the sleeve plate (39). A fan-shaped limiting ring (41) is connected to the side of the purification tank (10), and the lever handle (40) is inserted into the limiting ring (41).

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