Waste gas treatment device for steel structure welding

Abstract

The invention discloses a waste gas treatment device for steel structure welding, and belongs to the technical field of waste gas treatment devices.The waste gas treatment device comprises a machine body placed on the outer side of welding equipment, and a draught fan, a purifier and a primary filter barrel are installed on the inner side of the machine body from top to bottom one by one; the collecting tank is arranged at the lower part of the inner side of the machine body and is used for collecting dust; the rotating disc is elastically and rotationally installed on the inner side of the primary filter barrel, a driving assembly is connected between the rotating disc and the connecting pipe, rotation of the rotating disc is achieved through the wind action in the connecting pipe, filtering assemblies are evenly arranged on the rotating disc, and the lower ends of the filtering assemblies are fixedly connected with a base; and a dredging assembly is fixedly arranged below the base. The waste gas treatment device for steel structure welding can be driven by wind power to achieve multi-mode automatic unblocking, can assist in unblocking falling materials, and effectively improves the waste gas purification and treatment effect.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment devices, and in particular to a waste gas treatment device for steel structure welding. Background Art

[0002] During the steel structure welding process, a large amount of toxic and harmful fumes will be generated. In order to avoid air pollution and physical harm to workers, waste gas treatment devices are needed to treat the welding fumes.

[0003] Prior art 1 (application number: 202021424619.2, Chinese patent with application date of 2020-07-20) discloses an exhaust gas treatment device for steel structure welding, which relates to the technical field of exhaust gas treatment devices. Aiming at the problem that the existing welding exhaust gas treatment devices do not specifically treat harmful substances in the exhaust gas, the following scheme is proposed, which includes a working box, a water tank is fixedly connected to the working box, a first ventilation pipe is fixedly connected to the upper side of the water tank, and a multi-layer filter box fixedly connected to the working box at the other end of the first ventilation pipe, and a plurality of small filter boxes are slidably connected to the multi-layer filter box. The utility model has a simple structure and is easy to use. The exhaust gas generated during the welding process is comprehensively purified through the cooperation between the primary filter box, the multi-layer filter box, the small filter box and the water tank, so that the treated exhaust gas will not pollute the working environment, thereby protecting the health of the staff;

[0004] Prior art 2 (application number: 201010177243.4, Chinese patent application date: 2010-05-18) discloses a welding waste gas treatment device, which includes an air inlet pipe, an air outlet pipe, and a waste gas treatment chamber, a primary filter chamber, and a waste gas adsorption chamber connected in sequence between the air inlet pipe and the air outlet pipe. The present invention uses a multi-stage purification device to purify the welding waste gas, which can effectively remove welding fume waste gas and degrade welding fume tar smell and various toxic and harmful gases. It uses a combination of physical and chemical methods to treat welding waste gas or industrial waste gas, which is more sufficient and efficient. It has the advantages of being simple, economical, and affordable in actual use and operation.

[0005] Prior art 3 (application number: 202310039926.0, Chinese patent with application date of 2023-01-13) discloses a welding waste gas treatment device, which belongs to the technical field of waste gas treatment devices, and includes a welding table, a supporting block, a positioning block, a dust hood, a collection tank, a filter, an exhaust fan and a first connecting pipe. The supporting block is arranged on the welding table. The positioning block is fixedly arranged on the supporting block. The lower end of the dust hood is an open end and is fixedly connected to the welding table. The collection tank is fixedly connected to the welding table, and an air vent is provided on the collection tank. The filter is located in the collection tank and is fixedly connected to the collection tank, and the filter covers the air vent. The exhaust fan is fixedly arranged on the collection tank, and the air inlet of the exhaust fan is connected to the air vent. One end of the first connecting pipe is fixedly arranged on the top wall of the dust hood and is connected to the dust hood, and the other end is fixedly connected to the collection tank and is connected to the collection tank. The welding waste gas treatment device provided by it can avoid the problem that smoke during welding will endanger the health of operators.

[0006] During use, the existing waste gas treatment device for steel structure welding has a fixed structure of the filter component and lacks a certain automatic cleaning structure, which makes it easy to get clogged after a long time and affects the air permeability, thereby reducing the purification and filtration efficiency and having certain usage defects. Summary of the invention

[0007] The purpose of the present invention is to provide a waste gas treatment device for steel structure welding to solve the problem raised by the above background technology that the structure of the filter component of the waste gas treatment device for steel structure welding on the market is fixed during use, and lacks a certain automatic cleaning structure, which makes it easy to get clogged after a long time and affects the air permeability, thereby reducing the purification and filtration efficiency.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an exhaust gas treatment device for steel structure welding, comprising a body placed outside the welding equipment, a fan, a purifier and a primary filter barrel are installed one by one on the inner side of the body from top to bottom, and the air inlet of the fan is connected to the air outlet of the purifier, and a connecting pipe is connected between the upper ends of the purifier and the primary filter barrel, the air outlet of the fan is connected to an exhaust pipe, the lower outer side of the primary filter barrel is connected to a corrugated air inlet pipe, and the upper end cover of the corrugated air inlet pipe is arranged above the welding work area, and the lower end of the primary filter barrel is provided with a discharge port, and the discharge port is controlled by a valve;

[0009] It also includes: a collecting tank, which is arranged at the lower inner part of the machine body and is used to collect dust;

[0010] The rotating disk is elastically rotatably mounted on the inner side of the primary filter barrel, a driving assembly is connected between the rotating disk and the connecting pipe, and the rotation of the rotating disk is realized by the wind force in the connecting pipe, and the filtering assemblies are evenly arranged on the rotating disk, and the lower end of the filtering assembly is fixedly connected to a base, and a dredging assembly is fixedly arranged below the base;

[0011] The limiting rod is fixedly arranged on the inner wall of the lower end of the primary filter barrel to guide the base. A cleaning component is installed on the upper surface of the base to achieve knocking cleaning.

[0012] Preferably, the filter assembly includes a fixed cylinder evenly installed on the rotating disk, and the lower end of the fixed cylinder is fixedly connected with a filter cloth, and the filter cloth is arranged in an annular structure, and the lower end of the filter cloth is fixedly connected to the base.

[0013] By adopting the above technical solution, the welding waste gas sucked into the corrugated air intake pipe can be initially filtered through the filter cloth, and the filter cloth with an annular structure can increase the filtering area to improve the filtering efficiency.

[0014] Preferably, the driving assembly includes an impeller rotatably mounted on the inner side of a connecting pipe, and the inner diameter of the connecting pipe is smaller than the inner diameter of the corrugated air inlet pipe, and the impeller rotates under the action of wind force, and an incomplete gear is fixedly connected to the lower end of the impeller, and the incomplete gear is located below the connecting pipe.

[0015] By adopting the above technical solution, when the fan is started, the high-speed airflow passing through the connecting pipe will drive the impeller to rotate, so that the impeller drives the incomplete gear to rotate synchronously.

[0016] Preferably, the drive assembly also includes a shaft rod rotatably mounted on the inner wall of the primary filter barrel, and the upper and lower ends of the shaft rod are respectively fixedly connected with transmission gears, and the transmission gear located at the top is meshingly connected with the incomplete gear, and at the same time, a gear ring is fixedly connected to the upper surface of the rotating disk, and the gear ring is meshingly connected with the transmission gear located below.

[0017] By adopting the above technical solution, when the incomplete gear rotates, it will mesh with the transmission gear located above, thereby driving the transmission gear and the gear ring located below to mesh. At this time, the rotating disk can be driven to rotate. When the incomplete gear and the transmission gear are meshed, the rotating disk will automatically rotate and reset.

[0018] Preferably, the base is penetrated by a limiting rod, and the limiting rod and the filter cloth are coaxially arranged, and the base cooperates with the base to twist the filter cloth during the rotation of the rotating disk, and the base is raised and lowered and adjusted with the limiting rod during the twisting process of the filter cloth.

[0019] By adopting the above technical solution, when the rotating disk rotates back and forth, it will cooperate with the base to twist the filter cloth, so that the filtered material attached to the outside of the filter cloth is shaken off to avoid clogging of the filter cloth. At the same time, the lifting and lowering movement of the base can prevent the filter cloth from being torn due to excessive force.

[0020] Preferably, a first guide rod is fixedly mounted on the lower end of the rotating disk, and a spring is arranged on the outer side of the first guide rod, and the spring is connected between the rotating disk and the base.

[0021] By adopting the above technical solution, after the rotating disk rotates and resets, the base will move down and reset under the elastic force of the spring, thereby tightening the filter cloth to ensure the air permeability and filtering effect.

[0022] Preferably, the dredging component is a dredging rod, and the dredging rod is vertically fixedly installed at the center position of the lower end of the base, and the positions of the dredging rod and the discharge port are arranged correspondingly up and down.

[0023] By adopting the above technical solution, when the base drives the dredging rod to reciprocate and lift, the lower end of the dredging rod can reciprocate toward the discharge port, thereby clearing the filtered matter in the discharge port and avoiding blockage.

[0024] Preferably, the discharge port and the collecting tank are arranged correspondingly up and down, and the collecting tank and the body form a pull-out structure.

[0025] By adopting the above technical solution, the collection tank can collect the filtered particulate impurities, which is convenient for subsequent centralized processing and recycling, thereby improving the convenience of operation.

[0026] Preferably, the cleaning assembly includes a movable rod elastically rotatably mounted on the upper surface of the base, and the movable rod is arranged at an equal angle with respect to the limiting rod, and a magnetic sheet is fixedly mounted on the outer side of one end of the movable rod close to the limiting rod, and a magnetic ring is fixedly mounted on the upper end of the limiting rod, and the magnetic poles of the opposite surfaces of the magnetic ring and the magnetic sheet are the same.

[0027] By adopting the above technical solution, when the base moves upward, the upper end of the movable rod can be driven close to the magnetic ring, so that the movable rod can rotate elastically under the magnetic force of both the magnetic ring and the magnetic sheet.

[0028] Preferably, a knocking piece is fixedly provided on one side of the upper end of the movable rod close to the filter cloth, and the knocking piece knocks the inner wall of the filter cloth during the elastic rotation of the movable rod.

[0029] By adopting the above technical solution, when the movable rod is elastically rotated, it can knock the inner wall of the filter cloth through the knocking piece, so that the filtered impurities on the outer side of the filter cloth are further shaken off, thereby improving the clearing effect.

[0030] Compared with the prior art, the beneficial effects of the present invention are: the exhaust gas treatment device for steel structure welding can realize multi-mode automatic clearing through wind drive, and can assist in clearing the falling materials, effectively improving the exhaust gas purification and treatment effect;

[0031] 1. A rotating disk, filter cloth, impeller and incomplete gear are provided. As the connecting pipe is evacuated, the impeller inside it rotates under the action of wind force, thereby driving the incomplete gear to rotate, so that the incomplete gear drives the gear ring and the rotating disk to rotate synchronously through the transmission gear, and then the rotating disk cooperates with the base to twist the filter cloth, so that the filtered matter attached to the surface of the filter cloth falls off, realizing automatic clearing;

[0032] 2. A base, a magnetic ring, a movable rod and a magnetic sheet are provided. As the base moves upward, it drives the upper end of the movable rod to gradually approach the magnetic ring, so that the movable rod rotates elastically under the magnetic force of the magnetic ring and the magnetic sheet, and then the movable rod knocks the inner wall of the filter cloth through the knocking piece, thereby achieving further clearing operation and ensuring the efficient and long-term filtering effect of the filter cloth;

[0033] 3. A base and a dredging rod are provided. The twisting of the filter cloth will drive the base to elastically rise along the first guide rod and the limit rod. When the rotating disk rotates and resets, the base will elastically move downward under the action of the spring force, thereby making the dredging rod provided on the lower surface of the base synchronously rise and fall, thereby dredging the filtered material accumulated at the discharge port to avoid blockage and obstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0035] Figure 2 It is a bottom view structural schematic diagram of the present invention;

[0036] Figure 3 It is a schematic diagram of the cross-sectional structure of the machine body of the present invention;

[0037] Figure 4 This is a schematic diagram of the cross-sectional structure of the primary filter barrel of the present invention;

[0038] Figure 5 This is a schematic diagram of the filter cloth installation structure of the present invention;

[0039] Figure 6 This is a schematic diagram of the connection structure between the filter cloth and the base of the present invention;

[0040] Figure 7 It is a schematic diagram of the cross-sectional structure of the filter cloth of the present invention;

[0041] Figure 8 For the present invention Figure 7 Enlarged structural diagram at A in the middle.

[0042] In the figure: 1. body; 2. fan; 3. purifier; 4. primary filter barrel; 5. connecting pipe; 6. corrugated air inlet pipe; 7. exhaust pipe; 8. discharge port; 9. collecting tank; 10. rotating disk; 11. fixed cylinder; 12. filter cloth; 13. impeller; 14. incomplete gear; 15. shaft; 16. transmission gear; 17. gear ring; 18. base; 19. spring; 20. first guide rod; 21. dredging rod; 22. limiting rod; 23. magnetic ring; 24. movable rod; 25. magnetic sheet; 26. knocking piece. DETAILED DESCRIPTION

[0043] Example 1: Please refer to Figure 1-Figure 5 and Figure 7-Figure 8 As shown, the existing steel structure welding waste gas treatment device is inconvenient to automatically clean and collect the filtered impurities during use, which causes the filter components to be easily blocked and affects the treatment efficiency. In order to solve this technical problem, this embodiment discloses the following technical content;

[0044] A waste gas treatment device for steel structure welding, comprising a body 1 placed outside the welding equipment, a fan 2, a purifier 3 and a primary filter barrel 4 are installed one by one on the inner side of the body 1 from top to bottom, and the air inlet of the fan 2 is connected to the air outlet of the purifier 3, and a connecting pipe 5 is connected between the upper ends of the purifier 3 and the primary filter barrel 4, the air outlet of the fan 2 is connected to an exhaust pipe 7, the lower outer side of the primary filter barrel 4 is connected to a corrugated air inlet pipe 6, and the upper end cover of the corrugated air inlet pipe 6 is arranged above the welding work area, and the lower end of the primary filter barrel 4 is provided with a discharge port 8, and the discharge port 8 is controlled by a valve;

[0045] It also includes: a collecting tank 9, which is arranged at the inner lower part of the body 1 and is used to collect dust; a rotating disk 10, which is elastically rotatably installed on the inner side of the primary filter barrel 4, a driving component is connected between the rotating disk 10 and the connecting pipe 5, and the rotation of the rotating disk 10 is achieved by the wind force in the connecting pipe 5, and the rotating disk 10 is evenly arranged with filter components, and the lower end of the filter component is fixedly connected with a base 18, and a dredging component is fixedly arranged below the base 18;

[0046] The limiting rod 22 is fixedly arranged on the inner wall of the lower end of the primary filter barrel 4 to guide the base 18. A cleaning component is installed on the upper surface of the base 18 to achieve knocking cleaning.

[0047] The filter assembly includes a fixed cylinder 11 evenly installed on the rotating disk 10, and the lower end of the fixed cylinder 11 is fixedly connected with a filter cloth 12, and the filter cloth 12 is arranged in an annular structure, and the lower end of the filter cloth 12 is fixedly connected to the base 18.

[0048] The driving assembly includes an impeller 13 rotatably mounted on the inner side of the connecting pipe 5 , and the inner diameter of the connecting pipe 5 is smaller than the inner diameter of the corrugated air inlet pipe 6 , and the impeller 13 rotates under the action of wind force, and at the same time, an incomplete gear 14 is fixedly connected to the lower end of the impeller 13 , and the incomplete gear 14 is located below the connecting pipe 5 .

[0049] The driving assembly also includes a shaft 15 rotatably mounted on the inner wall of the primary filter barrel 4, and the upper and lower ends of the shaft 15 are respectively fixedly connected with transmission gears 16, and the transmission gear 16 located at the top is meshingly connected with the incomplete gear 14, and at the same time, a gear ring 17 is fixedly connected to the upper surface of the rotating disk 10, and the gear ring 17 is meshingly connected with the transmission gear 16 located at the bottom.

[0050] The base 18 is penetrated by the limiting rod 22 , and the limiting rod 22 and the filter cloth 12 are coaxially arranged. The base 18 cooperates with the base 18 to twist the filter cloth 12 during the rotation of the rotating disk 10 . At the same time, the base 18 is raised and lowered with the limiting rod 22 during the twisting process of the filter cloth 12 .

[0051] A first guide rod 20 is fixedly mounted on the lower end of the rotating disk 10, and a spring 19 is arranged on the outer side of the first guide rod 20, and the spring 19 is connected between the rotating disk 10 and the base 18. The dust cleaning assembly includes a movable rod 24 elastically rotatably mounted on the upper surface of the base 18, and the movable rod 24 is arranged at an equal angle with respect to the limit rod 22, and a magnetic sheet 25 is fixedly arranged on the outer side of one end of the movable rod 24 close to the limit rod 22, and a magnetic ring 23 is fixedly mounted on the upper end of the limit rod 22, and the magnetic poles of the opposite surfaces of the magnetic ring 23 and the magnetic sheet 25 are the same.

[0052] A knocking piece 26 is fixedly provided on one side of the upper end of the movable rod 24 close to the filter cloth 12 , and the knocking piece 26 knocks the inner wall of the filter cloth 12 during the elastic rotation of the movable rod 24 .

[0053] By adopting the above technical solution, when it is necessary to treat the welding exhaust gas, the corrugated air inlet pipe 6 is moved and adjusted so that the upper end cover of the corrugated air inlet pipe 6 is set above the welding area, and the fan 2 is started so that the fan 2 extracts the exhaust gas generated by welding through the corrugated air inlet pipe 6. At this time, the exhaust gas will enter the primary filter barrel 4 and be filtered by the filter cloth 12. The filtered exhaust gas will enter the purifier 3 through the connecting pipe 5 and be discharged through the exhaust pipe 7 after purification. During this process, the impeller 13 will rotate under the action of wind force, thereby driving the incomplete gear 14 to rotate, so that the incomplete gear 14 and the transmission gear 16 at the upper end of the shaft rod 15 are meshed, thereby driving the shaft rod 15 to rotate, and the transmission gear 16 at the lower end of the shaft rod 15 will mesh with the gear ring 17. , thereby driving the rotating disk 10 to rotate reciprocatingly. At this time, the rotating disk 10 will drive the upper end of the filter cloth 12 to move through the fixed cylinder 11, so that the rotating disk 10 can cooperate with the base 18 to twist the filter cloth 12, and then the filtered impurities attached to the outside of the filter cloth 12 can be loosened and dropped, thereby realizing automatic blockage clearing. As the filter cloth 12 twists, it will pull the base 18 connected to the lower end to elastically move upward along the limit rod 22. At this time, the base 18 will gradually approach the top of the limit rod 22, so that the upper end of the movable rod 24 is close to the limit rod 22, so that the magnetic sheet 25 is close to the magnetic ring 23. At this time, the movable rod 24 will elastically rotate under the action of the magnetic force, so that the knocking piece 26 on the outside of the movable rod 24 can knock the inner wall of the filter cloth 12, thereby further improving the blockage clearing effect.

[0054] Embodiment 2: The technical content disclosed in this embodiment is a further improvement based on the above embodiment 1. The existing exhaust gas treatment device is not convenient for conveniently discharging and collecting the filtered impurities. In order to further solve this technical problem, this embodiment discloses the following technical content, such as Figure 3-Figure 4 and Figure 6 As shown;

[0055] The dredging component is a dredging rod 21, and the dredging rod 21 is vertically fixedly installed at the lower end center position of the base 18, and the positions of the dredging rod 21 and the discharge port 8 are correspondingly arranged up and down.

[0056] The discharge port 8 and the collecting tank 9 are arranged correspondingly up and down, and the collecting tank 9 and the body 1 form a pull-out structure.

[0057] By adopting the above technical solution, as the rotating disk 10 rotates, it drives the base 18 to be raised and lowered through the filter cloth 12. At this time, the dredging rod 21 at the lower end of the base 18 will move up and down synchronously, so that the dredging rod 21 can push the filtered material in the discharge port 8 to achieve automatic dredging, thereby avoiding blockage in the discharge port 8 during the discharge process. The collecting tank 9 can collect the discharged filtered material, and subsequently, by pulling out the collecting tank 9, centralized treatment of impurities can be achieved.

[0058] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A waste gas treatment device for steel structure welding, comprising a body (1) placed outside a welding device, a fan (2), a purifier (3) and a primary filter barrel (4) being installed one by one on the inner side of the body (1) from top to bottom, and the air inlet of the fan (2) is connected to the air outlet of the purifier (3), and a connecting pipe (5) is connected between the upper ends of the purifier (3) and the primary filter barrel (4), the air outlet of the fan (2) is connected to an exhaust pipe (7), the lower outer side of the primary filter barrel (4) is connected to a corrugated air inlet pipe (6), and the upper end of the corrugated air inlet pipe (6) is arranged above a welding work area, and the lower end of the primary filter barrel (4) is provided with a discharge port (8), and the discharge port (8) is controlled by a valve; It is characterized in that Also includes: A collecting trough (9) is arranged at the lower inner part of the machine body (1) and is used to collect dust; A rotating disk (10) is elastically rotatably mounted on the inner side of the primary filter barrel (4); a driving assembly is connected between the rotating disk (10) and the connecting pipe (5); the rotation of the rotating disk (10) is achieved by the wind force in the connecting pipe (5); filter assemblies are evenly arranged on the rotating disk (10); a base (18) is fixedly connected to the lower end of the filter assembly; and a dredging assembly is fixedly arranged below the base (18); The limiting rod (22) is fixedly arranged on the inner wall of the lower end of the primary filter barrel (4) to guide the base (18); a cleaning component is installed on the upper surface of the base (18) to achieve knocking cleaning.

2. A steel structure welding exhaust gas treatment device according to claim 1, Features: The filter assembly comprises a fixed cylinder (11) uniformly penetrated and installed on a rotating disk (10), and a filter cloth (12) is fixedly connected to the lower end of the fixed cylinder (11), and the filter cloth (12) is arranged in an annular structure, and the lower end of the filter cloth (12) is fixedly connected to a base (18).

3. A waste gas treatment device for steel structure welding according to claim 1, Features: The driving assembly comprises an impeller (13) rotatably mounted on the inner side of a connecting pipe (5), wherein the inner diameter of the connecting pipe (5) is smaller than the inner diameter of the corrugated air inlet pipe (6), and the impeller (13) rotates under the action of wind force, and an incomplete gear (14) is fixedly connected to the lower end of the impeller (13), and the incomplete gear (14) is located below the connecting pipe (5).

4. A steel structure welding exhaust gas treatment device according to claim 3, Features: The driving assembly also includes a shaft (15) rotatably mounted on the inner wall of the primary filter barrel (4), and the upper and lower ends of the shaft (15) are respectively fixedly connected to transmission gears (16), and the transmission gear (16) located at the top is meshingly connected to the incomplete gear (14), and the upper surface of the rotating disk (10) is fixedly connected to a gear ring (17), and the gear ring (17) is meshingly connected to the transmission gear (16) located at the bottom.

5. A waste gas treatment device for steel structure welding according to claim 4, Features: The base (18) is penetrated by a limiting rod (22), and the limiting rod (22) and the filter cloth (12) are coaxially arranged. The base (18) cooperates with the base to twist the filter cloth (12) during the rotation of the rotating disk (10), and the base (18) and the limiting rod (22) are raised and lowered and adjusted during the twisting of the filter cloth (12).

6. A steel structure welding exhaust gas treatment device according to claim 1, Features: A first guide rod (20) is fixedly mounted on the lower end of the rotating disk (10), and a spring (19) is arranged on the outer side of the first guide rod (20), and the spring (19) is connected between the rotating disk (10) and the base (18).

7. A steel structure welding exhaust gas treatment device according to claim 1, Features: The dredging component is a dredging rod (21), and the dredging rod (21) is vertically fixedly installed at the center position of the lower end of the base (18), and the positions of the dredging rod (21) and the discharge port (8) are arranged correspondingly up and down.

8. A waste gas treatment device for steel structure welding according to claim 7, Features: The discharge port (8) and the collecting tank (9) are arranged correspondingly up and down, and the collecting tank (9) and the machine body (1) form a pull-out structure.

9. The exhaust gas treatment device for steel structure welding according to claim 1, Features: The dust cleaning component comprises a movable rod (24) elastically rotatably mounted on the upper surface of the base (18), and the movable rod (24) is arranged at an equal angle with respect to the limiting rod (22), and a magnetic sheet (25) is fixedly arranged on the outer side of one end of the movable rod (24) close to the limiting rod (22), and a magnetic ring (23) is fixedly mounted on the upper end of the limiting rod (22), and the magnetic poles of the opposite surfaces of the magnetic ring (23) and the magnetic sheet (25) are the same.

10. A steel structure welding exhaust gas treatment device according to claim 9, Features: A knocking piece (26) is fixedly provided on one side of the upper end of the movable rod (24) close to the filter cloth (12), and the knocking piece (26) knocks the inner wall of the filter cloth (12) during the elastic rotation of the movable rod (24).

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