Vertical activated carbon waste gas treatment device

Abstract

The invention discloses a vertical activated carbon waste gas treatment device which comprises a tower body, a cleaning mechanism is arranged in the tower body, a water tank is arranged at the bottom of the tower body, supporting legs are fixedly connected to the bottom of the water tank, and two precise control proportion mechanisms are arranged on one side of the top face of the water tank. The bottom of the water tank is provided with a wastewater filtering treatment mechanism, the cleaning mechanism comprises a hydraulic rod and a brush, the hydraulic rod is arranged in the tower body, and the brush is fixedly connected to the output end of the hydraulic rod and used for cleaning dust on the surface of the limiting net. The working efficiency and safety are improved, accurate preparation of an acid solution is facilitated, so that the surface of the limiting net is effectively and rapidly cleaned, follow-up waste gas adsorption of activated carbon B to the maximum extent is facilitated, residues of pollutants in waste water can be effectively reduced, meanwhile, activated carbon A is convenient to replace, the durability of the system is improved, and the long-term operation efficiency of the whole system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, in particular to a vertical activated carbon waste gas treatment device. Background Art

[0002] Vertical activated carbon waste gas treatment device is an environmental protection equipment that uses the principle of activated carbon adsorption to purify waste gas. It is mainly used to remove harmful gases, odors, volatile organic compounds and other pollutants in the air. Its working principle is to adsorb pollutants in the waste gas through the porous structure of activated carbon, thereby achieving the purpose of purifying the air. Compared with other waste gas treatment equipment, the vertical activated carbon waste gas treatment device has a more compact design and is often used in places with a small footprint or where the equipment is required to be installed vertically.

[0003] First, the exhaust gas is sent into the vertical activated carbon adsorption tower through a fan, and the activated carbon will absorb harmful substances in the exhaust gas. The surface of the activated carbon has a large number of microporous structures, which can absorb volatile organic compounds, odorous gases, solvents, etc. in the gas. After the exhaust gas is fully in contact with the activated carbon, the pollutants in it are adsorbed on the surface of the activated carbon. After the exhaust gas passes through the activated carbon adsorption tower, it is purified.

[0004] Deficiencies of existing technology: When cleaning activated carbon, first, turn off the exhaust gas treatment device, ensure that the device stops running, cut off the power supply and gas source, ensure that there is no risk of electrical or gas leakage during operation, prepare new activated carbon, gloves, protective glasses, vacuum cleaners, protective clothing, etc. Before removing the activated carbon, use a vacuum cleaner or brush to clean the dust and residue in the equipment, ensure that the operating area is clean, and then clean or remove the activated carbon. It is more cumbersome and the staff are prone to inhale a lot of dust during the long cleaning process, which causes harm to the health of the staff during the operation, and also reduces the operating efficiency and safety. Summary of the invention

[0005] The object of the present invention is to provide a vertical activated carbon waste gas treatment device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a vertical activated carbon waste gas treatment device, comprising a tower body, a cleaning mechanism is arranged inside the tower body, a water tank is arranged at the bottom of the tower body, a support leg is fixedly connected to the bottom of the water tank, two sets of precision control proportional mechanisms are arranged on one side of the top surface of the water tank, a wastewater filtering and processing mechanism is arranged at the bottom of the water tank, and the cleaning mechanism comprises: A hydraulic rod, wherein the hydraulic rod is arranged inside the tower body; A brush, which is fixedly connected to the output end of the hydraulic rod and is used to clean dust on the surface of the limiting net; A threaded joint, wherein the threaded joint is fixedly connected to the bottom of the threaded joint; A threaded sleeve, which is threadedly connected to the bottom of the threaded joint and is used for disassembling and cleaning the dust collected in the ash tray; An ash storage pan is welded to the bottom of the threaded sleeve.

[0007] As a further improvement of the present invention, the two precise control ratio mechanisms include: Two pressure sensors, the two pressure sensors are arranged on one side of the top surface of the water tank; Two water pipes, the two water pipes are connected through one side of the water tank; Two electrically controlled valves, the two electrically controlled valves being respectively arranged on one side of the two water pipes; Two mixing boxes, the two mixing boxes are respectively fixedly connected to the tops of the two water pipes, and one side of the bottom surface of the two mixing boxes is respectively attached to the top surfaces of the two pressure sensors; A control panel is fixedly connected to one end of the top surface of the water tank.

[0008] As a further improvement of the present invention, the wastewater filtering and treatment mechanism comprises: A discharge pipe, the discharge pipe is arranged at the bottom of the water tank, and the outer surface of the discharge pipe is fixedly connected to the inner side wall of the support leg; Two silicone sealing pads, the two silicone sealing pads are arranged at the top end of the discharge pipe; A grid plate, wherein the grid plate is arranged on the surface of the silicone sealing pad; Activated carbon A, wherein the activated carbon A is placed inside the grid plate; A limiting rod, wherein the limiting rod is welded to the outer surface of the grid plate; The limiting block is fixedly connected to the outer surface of the discharge pipe, and the bottom of the limiting rod is rotatably connected to the inside of the limiting rod.

[0009] As a further improvement of the present invention, the top of the hydraulic rod is fixedly connected to a receiving plate, both sides of the receiving plate are threadedly connected with bolts, and the bottom of the receiving plate is arranged on the top surface of the tower body.

[0010] As a further improvement of the present invention, the inner side wall of the tower body is fixedly connected to a limiting net, and activated carbon B is placed on the outer surface of the limiting net, and the outer surface of the activated carbon B is located on the inner wall of the tower body.

[0011] As a further improvement of the present invention, a limiting disc is arranged at the bottom of the limiting net, and both ends of the bottom surface of the limiting disc are threadedly connected with quick-release screws.

[0012] As a further improvement of the present invention, a support plate is fixedly connected to one side of the water tank, a water pump is fixedly connected to the top of the support plate, an output end of the water pump is arranged at one end of the water tank, a transport pipe is connected through one side of the water pump, and a sprinkler head is fixedly connected to one end of the transport pipe.

[0013] As a further improvement of the present invention, an observation window is fixedly connected to the outer surface of the water tank, and scale lines are arranged on the outer surface of the observation window.

[0014] As a further improvement of the present invention, the outer surface of the tower body is connected to a connecting pipe, and a flange is welded to the outer surface of the connecting pipe.

[0015] As a further improvement of the present invention, a handle is welded to one side of the grid plate, and an anti-slip sleeve is sleeved on the outer surface of the handle.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the ash storage tray is tightly clamped at the bottom of the brush by rotating the threaded sleeve through the threaded joint, and the hydraulic rod is driven to drive the brush to move up and down repeatedly on the inner wall of the limiting net, so that the dust adhered to the inner wall of the limiting net falls into the ash storage tray, and there is no need to manually clean the dust, which reduces the possibility of dust inhalation by the staff, and improves work efficiency and safety; 2. In the present invention, the acidic solution is poured into one of the mixing boxes, and the weight of the acidic solution is set by one of the pressure sensors. After detecting that the capacity of the acidic solution reaches a certain weight, the signal is transmitted to the control panel, and the control panel drives one of the electronically controlled valves to discharge the acidic solution into the water tank through the water pipe. Then, the water proportioned with the acidic solution is poured into another group of precision-controlled proportion mechanisms through the same operation to dilute the acidic solution in the water tank. The acidic solution is used to dissolve certain mineral deposits and alkaline substances in the dust, which is conducive to the precise preparation of the acidic solution, thereby effectively and quickly cleaning the surface of the limiting net, and facilitating the subsequent activation carbon B to maximize the adsorption of waste gas; 3. In the present invention, the wastewater generated when the brush uses the diluted acidic solution to clean the limiting net flows into the filtering and treating wastewater mechanism through the groove in the middle of the water tank. At this time, the activated carbon A will intercept the impurities in the wastewater, and then the wastewater is discharged through the discharge pipe, and then the grid plate is rotated under the action of the limiting rod and the limiting block so that the grid plate is located on one side of the two silicone sealing pads, so that the impurities on the activated carbon A can be removed and processed, and then the grid plate is rotated again so that the grid plate is located between the two silicone sealing pads again, so that the wastewater can be filtered again, which can effectively reduce the residual pollutants in the wastewater, and at the same time, it is convenient for the replacement of activated carbon A, improves the durability of the system, and improves the long-term operation efficiency of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is an overall schematic diagram of the present invention; Figure 2 It is a schematic diagram of the cleaning mechanism of the present invention; Figure 3 This is a schematic diagram of the structure of activated carbon and a limiting disc of the present invention; Figure 4 It is a structural schematic diagram of the precision control mechanism of the present invention; Figure 5 This is a schematic diagram of the structure of the wastewater filtering and treatment mechanism of the present invention; Figure 6 This is a schematic diagram of the water pump structure of the present invention; Figure 7 It is a schematic diagram of the tower structure of the present invention.

[0018] In the figure: 1. tower body; 2. cleaning mechanism; 201. hydraulic rod; 202. brush; 203. threaded joint; 204. threaded sleeve; 205. ash storage tray; 3. water tank; 4. precision control proportion mechanism; 401. pressure sensor; 402. water pipe; 403. electric control valve; 404. mixing box; 405. control panel; 5. wastewater filtering and treatment mechanism; 501. discharge pipe; 502. silicone sealing pad; 503. grid plate; 504. activated carbon A; 505. limit rod; 506. limit block; 6. receiving plate; 7. bolt; 8. limit net; 9. activated carbon B; 10. limit disc; 11. quick release screw; 12. support plate; 13. water pump; 14. sprinkler head; 15. observation window; 16. scale line; 17. connecting pipe; 18. flange; 19. handle. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example See also Figure 1-7The present invention provides the following technical solutions: a vertical activated carbon waste gas treatment device, comprising a tower body 1, a cleaning mechanism 2 is arranged inside the tower body 1, a water tank 3 is arranged at the bottom of the tower body 1, a support leg is fixedly connected to the bottom of the water tank 3, two sets of precision control proportional mechanisms 4 are arranged on one side of the top surface of the water tank 3, a wastewater filtering and processing mechanism 5 is arranged at the bottom of the water tank 3, the cleaning mechanism 2 comprises a hydraulic rod 201, the hydraulic rod 201 is arranged inside the tower body 1, a brush 202, the brush 202 is fixedly connected to the output end of the hydraulic rod 201 and is used to clean the dust on the surface of the limiting net 8, a threaded joint 203, the threaded joint 203 is fixedly connected to the bottom of the threaded joint 203, and a threaded sleeve 204, the threaded sleeve 204 is threadedly connected to the bottom of the threaded joint 203 The ash storage pan 205 is used for disassembling and cleaning the dust collected in the ash storage pan 205. The ash storage pan 205 is welded to the bottom of the threaded sleeve 204. The threaded joint 203 and the threaded sleeve 204 are used to fix the ash storage pan 205 to the bottom of the brush 202. The ash storage pan 205 can be fastened in a specified position by rotation to avoid loosening during operation. The ash storage pan 205 is used to collect and store dust dropped from the brush 202 during cleaning. The hydraulic rod 201 is driven to drive the brush 202 to move up and down repeatedly on the inner wall of the limiting net 8, so that the dust adhered to the inner wall of the limiting net 8 falls into the storage ash pan 205. There is no need to manually clean the dust, which reduces the possibility of dust inhalation by staff and improves work efficiency and safety.

[0021] The two precision control proportional mechanisms 4 include two pressure sensors 401, which are arranged on one side of the top surface of the water tank 3, two water pipes 402, which are connected to one side of the water tank 3, two electric control valves 403, which are respectively arranged on one side of the two water pipes 402, two mixing boxes 404, which are respectively fixedly connected to the top of the two water pipes 402, and one side of the bottom surface of the two mixing boxes 404 is respectively attached to the top surface of the two pressure sensors 401, and a control panel 405, which is fixedly connected to one end of the top surface of the water tank 3, and an acid solution weight is set on the control panel 405, and the acid solution is poured into the prepared mixing box 404. At this time, the volume of the acid solution is still uncertain. When the weight of the acid solution When this set value is reached, the pressure sensor 401 will send a signal to the control panel 405. After receiving the weight signal, the control panel 405 triggers subsequent operations and starts to control the discharge of the acid solution through the electric control valve 403. When the electric control valve 403 is opened, the acid solution flows into the water tank 3 through the connected water pipe 402. After the acid solution is discharged into the water tank 3, it needs to be diluted according to a certain proportion. The ratio of water to acid solution is 1:10, that is, 1 part of acid solution is matched with 10 parts of water, which is similar to the previous acid solution filling. The control panel 405 receives the feedback signal and accurately controls the electric control valve 403 according to the target water volume, so that water flows into the water tank 3 to dilute the acid solution, which is conducive to the precise allocation of the acid solution, thereby effectively and quickly cleaning the surface of the limiting net 8, and facilitating the subsequent activated carbon B9 to maximize the adsorption of waste gas.

[0022] The wastewater filtering and treating mechanism 5 comprises a discharge pipe 501, which is arranged at the bottom of the water tank 3, the outer surface of the discharge pipe 501 is fixedly connected to the inner side wall of the support leg, two silicone sealing pads 502, which are arranged at the top of the discharge pipe 501, a mesh plate 503, which is arranged on the surface of the silicone sealing pad 502, activated carbon A504, which is placed inside the mesh plate 503, a limiting rod 505, which is welded to the outer surface of the mesh plate 503, a limiting block 506, which is fixedly connected to the outer surface of the discharge pipe 501, and the bottom of the limiting rod 505 is rotatably connected to the inside of the limiting rod 505, and the brush 202 uses the diluted acidic solution to clean the wastewater generated when the limiting net 8 is cleaned. The wastewater flows into the wastewater filtering and treating mechanism 5 through the groove opened in the middle of the water tank 3. The position design should ensure that the wastewater can flow evenly into the filtering and treating wastewater mechanism 5 to avoid excessive concentration or uneven flow of the wastewater, which would reduce the filtering effect. The function of the activated carbon A504 is to absorb the soluble impurities and suspended solids in the wastewater through a large number of micropores on its surface. The position of the grid plate 503 is controlled by the rotating structure between the limit rod 505 and the limit block 506. When the grid plate 503 rotates, the contaminated part during the filtering process will be exposed to one side of the two silicone sealing pads 502. The activated carbon A504 that has been cleaned and decontaminated will be put into use again. When the grid plate 503 rotates between the two silicone sealing pads 502, the wastewater flows through the activated carbon A504 again for secondary filtration, which can effectively reduce the residual pollutants in the wastewater. At the same time, it is also convenient for the replacement of the activated carbon A504, improves the durability of the system, and improves the long-term operation efficiency of the entire system.

[0023] The top of the hydraulic rod 201 is fixedly connected to the receiving plate 6 , both sides of the receiving plate 6 are threadedly connected with bolts 7 , and the bottom of the receiving plate 6 is arranged on the top surface of the tower body 1 .

[0024] The inner wall of the tower body 1 is fixedly connected with a limiting net 8 , and the outer surface of the limiting net 8 is placed with activated carbon B9 , and the outer surface of the activated carbon B9 is located on the inner wall of the tower body 1 .

[0025] A limiting disc 10 is arranged at the bottom of the limiting net 8, and both ends of the bottom surface of the limiting disc 10 are threadedly connected with quick-release screws 11. The limiting disc 10 is rotated and tightly clamped in the bearing area at the bottom of the tower body 1 through the quick-release screws 11, so that the activated carbon B9 is fixed to the inner wall of the tower body 1.

[0026] A support plate 12 is fixedly connected to one side of the water tank 3, a water pump 13 is fixedly connected to the top of the support plate 12, an output end of the water pump 13 is arranged at one end of the water tank 3, a transport pipe is through-connected to one side of the water pump 13, a spray head 14 is fixedly connected to one end of the transport pipe, the water pump 13 is driven to extract the diluted acid solution in the water tank 3, transport it to the spray head 14, and spray it on the inner wall of the limiting net 8 and the surface of the brush 202 through the spray head 14, so that the brush 202 can more thoroughly clean the dust on the surface of the limiting net 8.

[0027] An observation window 15 is fixedly connected to the outer surface of the water tank 3. A scale line 16 is arranged on the outer surface of the observation window 15 to facilitate checking whether the capacity of the diluted acid solution is sufficient.

[0028] The outer surface of the tower body 1 is connected to a connecting pipe 17 , and a flange 18 is welded to the outer surface of the connecting pipe 17 , so as to facilitate the installation and fixing of the device on one side of the exhaust gas generating equipment.

[0029] A handle 19 is welded to one side of the grid plate 503, and an anti-skid cover is sleeved on the outer surface of the handle 19 to prevent the hand from slipping or static electricity.

[0030] Working principle: Activated carbon B9 is placed between the limiting net 8 and the tower body 1. The limiting disc 10 is rotated and tightened to the bearing area at the bottom of the tower body 1 by the quick-release screws 11, so that the activated carbon B9 is fixed to the inner wall of the tower body 1. The acid solution is poured into one of the groups of mixing boxes 404. The weight of the acid solution is set by one of the pressure sensors 401. After detecting that the capacity of the acid solution reaches a certain weight, the signal is transmitted to the control panel 405. The control panel 405 drives one of the groups of electric control valves 403, so that the acid solution is discharged into the water tank 3 through the water pipe 402. Then, through the same operation, water in a ratio of 1:10 with the acid solution is poured into another set of precision control proportion mechanism 4 to dilute the acid solution in the water tank 3. The acid solution is used to dissolve certain mineral deposits and alkaline substances in dust, which is conducive to the precise deployment of the acid solution, thereby effectively and quickly cleaning the surface of the limiting net 8, facilitating the subsequent activated carbon B9 to maximize the adsorption of exhaust gas, and then the threaded joint 203 rotates the threaded sleeve 204 to tighten the storage ash tray 205 at the bottom of the brush 202, driving the water pump 13 to extract the diluted acid solution in the water tank 3 and transport it to the spray head 14, and then The overspray head 14 sprays on the inner wall of the limiting net 8 and the surface of the brush 202, driving the hydraulic rod 201 to drive the brush 202 to move up and down repeatedly on the inner wall of the limiting net 8, so that the dust adhered to the inner wall of the limiting net 8 falls into the storage ash tray 205, without manual dust cleaning, reducing the possibility of dust inhalation by workers, improving work efficiency and safety, and the brush 202 uses the diluted acid solution to clean the wastewater generated when the limiting net 8 is cleaned. The wastewater flows into the filtering and treating wastewater mechanism 5 through the groove in the middle of the water tank 3. At this time, the activated carbon A504 will block the impurities in the wastewater. The waste water is then discharged through the discharge pipe 501, and then the grid plate 503 is rotated under the action of the limit rod 505 and the limit block 506, so that the grid plate 503 is located on one side of the two silicone sealing pads 502, so that the impurities on the activated carbon A504 can be removed and processed, and then the grid plate 503 is rotated again, so that the grid plate 503 is located between the two silicone sealing pads 502 again, so that the waste water can be filtered again, which can effectively reduce the residual pollutants in the waste water, and at the same time, it is also convenient for the replacement of activated carbon A504, improve the durability of the system, and improve the long-term operation efficiency of the entire system.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vertical activated carbon waste gas treatment device, comprising a tower body (1), characterized in that: A cleaning mechanism (2) is arranged inside the tower body (1), a water tank (3) is arranged at the bottom of the tower body (1), a support leg is fixedly connected to the bottom of the water tank (3), two groups of precision control proportional mechanisms (4) are arranged on one side of the top surface of the water tank (3), and a wastewater filtering and processing mechanism (5) is arranged at the bottom of the water tank (3), and the cleaning mechanism (2) comprises: A hydraulic rod (201), wherein the hydraulic rod (201) is arranged inside the tower body (1); A brush (202), the brush (202) being fixedly connected to the output end of the hydraulic rod (201) and used for cleaning dust on the surface of the limiting net (8); A threaded joint (203), wherein the threaded joint (203) is fixedly connected to the bottom of the threaded joint (203); A threaded sleeve (204), the threaded sleeve (204) being threadedly connected to the bottom of the threaded joint (203) and used for disassembling and cleaning the dust collected in the ash tray (205); An ash storage tray (205) is welded to the bottom of the threaded sleeve (204).

2. The vertical activated carbon waste gas treatment device according to claim 1 is characterized in that: The two precise proportional control mechanisms (4) include: Two pressure sensors (401), the two pressure sensors (401) being arranged on one side of the top surface of the water tank (3); Two water pipes (402), the two water pipes (402) being connected through one side of the water tank (3); Two electrically controlled valves (403), the two electrically controlled valves (403) being respectively arranged on one side of the two water pipes (402); Two mixing boxes (404), the two mixing boxes (404) are respectively fixedly connected to the tops of the two water pipes (402), and one side of the bottom surface of the two mixing boxes (404) is respectively attached to the top surfaces of the two pressure sensors (401); A control panel (405), wherein the control panel (405) is fixedly connected to one end of the top surface of the water tank (3).

3. The vertical activated carbon waste gas treatment device according to claim 1 is characterized in that: The wastewater filtering and treatment mechanism (5) comprises: A discharge pipe (501), the discharge pipe (501) being arranged at the bottom of the water tank (3), and the outer surface of the discharge pipe (501) being fixedly connected to the inner side wall of the support leg; Two silicone sealing pads (502), the two silicone sealing pads (502) being arranged at the top end of the discharge pipe (501); A mesh plate (503), wherein the mesh plate (503) is arranged on the surface of the silicone sealing pad (502); Activated carbon A (504), wherein the activated carbon A (504) is placed inside the grid plate (503); A limiting rod (505), wherein the limiting rod (505) is welded to the outer surface of the mesh plate (503); A limit block (506) is fixedly connected to the outer surface of the discharge pipe (501), and the bottom of the limit rod (505) is rotatably connected to the inside of the limit rod (505).

4. The vertical activated carbon waste gas treatment device according to claim 1 is characterized in that: The top of the hydraulic rod (201) is fixedly connected to a receiving plate (6), both sides of the receiving plate (6) are threadedly connected with bolts (7), and the bottom of the receiving plate (6) is arranged on the top surface of the tower body (1).

5. The vertical activated carbon waste gas treatment device according to claim 2 is characterized in that: The inner side wall of the tower body (1) is fixedly connected to a limiting net (8), and activated carbon B (9) is placed on the outer surface of the limiting net (8), and the outer surface of the activated carbon B (9) is located on the inner wall of the tower body (1).

6. The vertical activated carbon waste gas treatment device according to claim 5 is characterized in that: A limiting disc (10) is arranged at the bottom of the limiting net (8), and both ends of the bottom surface of the limiting disc (10) are threadedly connected with quick-release screws (11).

7. The vertical activated carbon waste gas treatment device according to claim 1 is characterized in that: A support plate (12) is fixedly connected to one side of the water tank (3), a water pump (13) is fixedly connected to the top of the support plate (12), an output end of the water pump (13) is arranged at one end of the water tank (3), a transport pipe is connected through one side of the water pump (13), and a spray head (14) is fixedly connected to one end of the transport pipe.

8. The vertical activated carbon waste gas treatment device according to claim 1 is characterized in that: An observation window (15) is fixedly connected to the outer surface of the water tank (3), and a scale line (16) is provided on the outer surface of the observation window (15).

9. The vertical activated carbon waste gas treatment device according to claim 1, characterized in that: The outer surface of the tower body (1) is in communication with a connecting pipe (17), and a flange (18) is welded to the outer surface of the connecting pipe (17).

10. The vertical activated carbon waste gas treatment device according to claim 3, characterized in that: A handle (19) is welded to one side of the mesh plate (503), and an anti-slip sleeve is sleeved on the outer surface of the handle (19).

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