Steel structure welding device

Abstract

The application relates to a steel structure welding device in the fields of the application and welding apparatuses, which comprises a welding handle, a clamping mechanism for clamping an electrode is arranged in the welding handle, a filter cylinder is fixedly connected to the welding handle, the filter cylinder is a double-layer shell structure, comprises an inner cylinder and an outer cylinder, and notches for ventilation are arranged on the shells at the front end and the rear end of the filter cylinder, a filter fan is rotationally connected between the inner cylinder and the outer cylinder of the filter cylinder, the outer side of the filter fan is uniformly processed with teeth, a driving gear meshing with the teeth on the filter fan is rotationally connected to the outer cylinder of the filter cylinder, and a filter device is arranged between the inner cylinder and the outer cylinder at the rear side of the filter fan, so that the generated waste gas in the welding process can be directly filtered at the position of the welding point, and the health of the on-site workers is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of welding apparatus, in particular to a steel structure welding device. BACKGROUND

[0002] In the process of building, a large amount of steel structure is often needed, and a large amount of steel structure needs to be cut and welded according to the specific use environment. In the process of welding, spot welding tools are often used in large quantities.

[0003] Spot welding is a metal welding method, also known as resistance welding. Its principle is to apply pressure to the workpiece by electrodes and pass electricity, use the heat generated by the contact resistance to locally melt, and form a welding spot after cooling. Spot welding has many advantages;

[0004] First, spot welding is fast, usually able to produce a reaction in a very short time, which can significantly improve the efficiency of welding;

[0005] Second, the current, pressure and heating time and other parameters in the spot welding process can be accurately controlled, so the quality of the welding is stable and reliable, and can meet the needs of various industrial applications;

[0006] Third, the operation of spot welding equipment is relatively simple, and the skill requirement of the operator is not high, easy to train and master;

[0007] The spot welding equipment includes a welding power supply, welding tongs, welding cables, clamps and welding rods. The welding power supply mainly provides a power source. In use, the welding tongs are connected to the positive electrode of the welding power supply through the welding cable, and the clamps are connected to the negative electrode of the power supply through the welding cable. The welding tongs hold the welding rod, and the clamps are connected to the workpiece. The operator holds the welding tongs to weld the workpiece. However, in this process, the welding rod will produce certain toxic waste gas, such as carbon monoxide, nitrogen oxides and ozone, etc. The existing welding equipment often does not have related processing devices, which may harm the human body, such as the personnel on the construction site are often dense, which may cause the user and other workers on the construction site to inhale more harmful gases, thereby affecting the health. SUMMARY

[0008] The present application provides a steel structure welding device, which can filter the waste gas generated in the welding process at the position of the welding spot by modifying the structure of the welding tongs, so as to not affect the health of the on-site workers.

[0009] The present application provides a steel structure welding device, comprising:

[0010] A welding handle is provided with a clamping mechanism for clamping a welding rod;

[0011] A filter cartridge is fixedly installed on the welding handle, and the filter cartridge is a double-layer shell structure including an inner cylinder and an outer cylinder, and a slot for ventilation is formed on the shell of the front end and the rear end of the filter cartridge;

[0012] A filter fan is rotationally connected between the inner cylinder and the outer cylinder of the filter cartridge, the outer side of the filter fan is uniformly provided with teeth, and a drive gear rotationally connected with the teeth of the filter fan is arranged in the outer cylinder of the filter cartridge.

[0013] A filter device is arranged between the inner cylinder and the outer cylinder of the filter cartridge, and the filter device is located at the rear side of the filter fan.

[0014] Preferably, a particle blocking plate is arranged between the inner cylinder and the outer cylinder of the filter cartridge at a position in front of the filter fan, and a large number of fine holes are formed on the particle blocking plate.

[0015] Preferably, the particle blocking plate is slidably connected with the filter cartridge in the front-rear direction, a first spring is fixedly connected between the outer side of the particle blocking plate and the outer cylinder of the filter cartridge, a cleaning rod is fixedly connected to the front end of the filter fan, and a brush is arranged on the cleaning rod.

[0016] Preferably, the particle blocking plate is slidably connected with the filter cartridge in the front-rear direction, a cleaning mechanism is arranged between the particle blocking plate and the filter fan, a plurality of cleaning mechanisms are uniformly distributed along the circumferential direction of the particle blocking plate, the cleaning mechanism includes a first sliding contact plate and a folding plate, the first sliding contact plate is rotationally connected with the outer side of the particle blocking plate, each cleaning structure includes a pair of folding plates, the two folding plates in the pair of folding plates are respectively hinged to the first sliding contact plate and the front end of the filter fan, and the two folding plates are hinged at the middle position, the folding plate close to the particle blocking plate is provided with a brush facing one end of the central axis of the filter cylinder, and a return spring is further arranged between the first sliding contact plate and the filter fan.

[0017] Preferably, the filter device includes a plurality of filter tanks, each filter tank is divided into a plurality of arc-shaped regions, an adsorbing material for adsorbing smoke is arranged in each arc-shaped region, an air inlet end and an air outlet end are formed on both ends of each arc-shaped region, a filter layer for adsorbing and treating smoke generated in the welding process is arranged in the arc-shaped region, the arc-shaped regions in adjacent filter tanks correspond to each other, the air inlet end and the air outlet end of adjacent filter layers are connected, and the air inlet end and the air outlet end of each arc-shaped region are located at the positions of the other two arc-shaped regions close to the arc-shaped region.

[0018] Preferably, the plurality of filter tanks are filled with filter layers containing different adsorbing materials.

[0019] Preferably, the filter layer comprises different layers, each containing a different adsorbent.

[0020] Preferably, the filtration device includes a filter canister, the front and back of which are hollowed out. A medium for adsorbing flue gas is placed in the filter canister. An agitator is slidably disposed in the filter canister. Several slender flexible rods are distributed on the agitator. The agitator passes through the front end of the filter canister and is fixedly connected to a second sliding contact plate. A spring is provided between the second sliding contact plate and the filter canister. The first sliding contact plate passes through the filter fan through a rod and is fixedly connected to a third sliding contact plate corresponding to the second sliding contact plate.

[0021] Preferably, a frustoconical air inlet shroud is fixedly installed at the front end of the filter cartridge.

[0022] Preferably, the clamping mechanism includes a first clamping plate and a second clamping plate. The first clamping plate is fixedly mounted on the welding handle, and the second clamping plate is slidably connected to the welding handle relative to the first clamping plate. The first and second clamping plates extend toward the middle position of the filter cartridge. A spring for clamping the first and second clamping plates is fixedly installed in the welding handle. The welding handle is also provided with a pressing rod for fixedly connecting with the second clamping plate.

[0023] Beneficial effects:

[0024] 1. This invention uses a drive gear that meshes with the teeth of a filter fan to drive the fan's rotation. During rotation, the filter fan draws air and waste gas generated during welding into the space between the inner and outer cylinders of the filter cartridge. The waste gas is then filtered by the filtration device. Because the filter cartridge is very close to the welding point, the welding fumes generated during the process can be effectively absorbed by the filter fan. After being filtered by the filtration device, which contains highly absorbent substances such as activated carbon and molecular sieves, the absorbed waste gas can effectively adsorb and remove carbon monoxide, nitrogen oxides, and ozone. The gas discharged from the back of the filter cartridge will no longer pose a hazard to on-site personnel.

[0025] 2. This invention works by accumulating a sufficient number of fine particles on the particle baffle plate. This affects the efficiency of the exhaust gas generated during welding entering the inner and outer cylinders of the filter cartridge. At this point, the filter fan, unable to absorb enough gas, will generate suction on the particle baffle plate, causing it to move towards the filter fan. When the brush on the cleaning rod comes into contact with the particle baffle plate, the brush can insert into the fine holes in the particle baffle plate to clean the fine particles. After cleaning the fine particles, the ventilation of the particle baffle plate will be enhanced, thus enabling the particle baffle plate to work continuously.

[0026] 3. In this invention, when the first sliding contact plate drives the third sliding contact plate to approach and contact the second sliding contact plate, the second sliding contact plate will drive the stirring plate to move back and forth in the filter tank. The flexible rod on the stirring plate will repeatedly agitate the adsorption medium in the filter tank. Because the utilization rate of the adsorption medium is different at different positions, the utilization rate of the adsorption medium near the filter fan is relatively high, while the utilization rate of the adsorption medium far from the filter fan is relatively low. By repeatedly agitating the adsorption medium in the filter tank through the flexible rod on the stirring plate, the adsorption state of each part of the adsorption medium can always be kept in a uniform state, thereby extending the service life of the filter tank. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of the present invention;

[0029] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point B in the middle;

[0030] Figure 4 This is a cross-sectional view of Embodiment 2 of the present invention;

[0031] Figure 5 for Figure 4 A magnified view of the structure at point A in the middle;

[0032] Figure 6 This is a schematic diagram of the structure of a filtration device according to the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the second type of filtration device in this invention;

[0034] Figure 8 This is a schematic diagram of the structure of the third type of filtration device in this invention;

[0035] Figure 9This is a schematic diagram of the clamping mechanism in the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Welded handle; 2. Clamping mechanism; 21. First clamping plate; 22. Second clamping plate; 23. Pressing rod; 3. Filter cylinder; 31. Inner cylinder; 32. Outer cylinder; 33. Drive gear; 4. Filter fan; 41. Cleaning rod; 42. Third sliding contact plate; 5. Filtering device; 51. Filter canister; 511. Stirring rod; 512. Second sliding contact plate; 6. Particle blocking plate; 61. First spring; 7. Cleaning mechanism; 71. First sliding contact plate; 72. Folding plate; 73. Return spring; 8. Air inlet hood. Detailed Implementation

[0038] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0039] like Figures 1 to 9 As shown, the present invention provides a steel structure welding device, comprising:

[0040] Welding grip 1, wherein the welding grip 1 is provided with a clamping mechanism 2 for clamping welding rod;

[0041] The filter cylinder 3 is fixedly installed on the welded handle 1. The filter cylinder 3 has a double-layer shell structure, including an inner cylinder 31 and an outer cylinder 32. The front and rear ends of the filter cylinder 3 are provided with slots for ventilation.

[0042] The filter fan 4 is rotatably connected between the inner cylinder 31 and the outer cylinder 32 of the filter cylinder 3. The outer side of the filter fan 4 is uniformly machined with teeth. A drive gear 33 that meshes with the teeth on the filter fan 4 is rotatably connected in the outer cylinder 32 of the filter cylinder 3.

[0043] The filter device 5 is located between the inner cylinder 31 and the outer cylinder 32 of the filter cylinder 3, and is located behind the filter fan 4.

[0044] During the welding of steel structures on construction sites using this invention, workers hold the welding rod using the clamping mechanism 2 and weld the workpiece by hand using the welding handle 1. During this process, the built-in motor drives the rotation of the drive gear 33, which meshes with the teeth on the filter fan 4, thereby driving the filter fan 4 to rotate. As the filter fan 4 rotates, it draws air and the exhaust gas generated during the welding process into the space between the inner cylinder 31 and the outer cylinder 32 of the filter cylinder 3. The exhaust gas is then filtered by the filter device 5. Because the filter cylinder 3 is very close to the welding point, the welding fumes and exhaust gas generated during the process can be effectively absorbed by the filter fan 4. After being filtered by the filter device 5, which contains substances with strong adsorption properties, such as activated carbon and molecular sieves, the absorbed exhaust gas can effectively adsorb and remove carbon monoxide, nitrogen oxides, and ozone. The gas discharged from the back of the filter cylinder 3 will no longer pose a hazard to the workers at the site.

[0045] like Figure 2 and Figure 4 As shown, a particle baffle 6 is provided between the inner cylinder 31 and the outer cylinder 32 of the filter cylinder 3 at the front end of the filter fan 4, and the particle baffle 6 is processed with dense fine holes.

[0046] It should be noted that during the welding process of steel workpieces using welding rods, solid particles are also generated, such as fine particles formed by the rapid cooling and solidification of molten metal splashed into the air, or the slag formed on the outside of the welding rod during the welding process. These substances can easily clog the filter device 5 after entering it, thereby affecting the absorption efficiency of the filter device 5 for harmful gases generated during the welding process. The particle blocking plate 6 can effectively block these particles without affecting the air entering between the inner cylinder 31 and the outer cylinder 32 of the filter cylinder 3.

[0047] like Figure 2 and Figure 3 As shown, the particle blocking plate 6 is slidably connected to the filter cylinder 3 in the front-back direction. A first spring 61 is fixedly connected between the outer side of the particle blocking plate 6 and the outer cylinder 32 of the filter cylinder 3. A cleaning rod 41 is fixedly connected to the front end of the filter fan 4, and a brush is installed on the cleaning rod 41.

[0048] It should be noted that during the process of the particle baffle 6 blocking fine particles, after a long period of accumulation, the fine particles will accumulate to a sufficient number. This will affect the efficiency of the exhaust gas generated during the welding process entering the inner cylinder 31 and outer cylinder 32 of the filter cylinder 3. At this time, the filter fan 4 will generate suction on the particle baffle 6 because it cannot absorb enough gas, causing the particle baffle 6 to move towards the filter fan 4. When the brush on the cleaning rod comes into contact with the particle baffle 6, the brush can be inserted into the fine holes in the particle baffle 6 to clean the fine particles. After the fine particles are cleaned, the air permeability of the particle baffle 6 will become stronger, and the filter fan 4 will no longer generate suction on the particle baffle 6. At this time, under the rebound action of the first spring 61, the particle baffle 6 will return to its initial position.

[0049] like Figure 4 and Figure 5 As shown, the particle blocking plate 6 is slidably connected to the filter cylinder 3 along the front-to-back direction. A cleaning mechanism 7 is provided between the particle blocking plate 6 and the filter fan 4. Multiple cleaning mechanisms 7 are evenly distributed along the circumference of the particle blocking plate 6. Each cleaning mechanism 7 includes a first sliding contact plate 71 and a folding plate 72. The first sliding contact plate 71 is rotatably connected to the outer side of the particle blocking plate 6. Each cleaning mechanism includes a pair of folding plates 72. Two of the folding plates 72 are respectively hinged to the first sliding contact plate 71 and the front end of the filter fan 4, and the two folding plates 72 are hinged at the middle position. A brush is provided at the end of the folding plate 72 near the particle blocking plate 6 facing the central axis of the filter cylinder 3. A return spring 73 is also provided between the first sliding contact plate 71 and the filter fan 4.

[0050] It should be noted that when fine particles accumulate on the particle baffle 6, the particle baffle 6 becomes airtight. At this time, the filter fan 4 cannot draw in enough air and will generate suction on the particle baffle 6. The particle baffle 6 will then move closer to the filter fan 4. At this point, the folding plate 72 will fold, and the end of the folding plate 72 with the brush will face the particle baffle 6. The filter fan 4 will then drive the folding plate 72 to rotate, and the brush on the folding plate 72 will clean the particle baffle 6. After cleaning, the air permeability of the particle baffle 6 will increase, and the filter fan 4 will no longer be able to generate suction on the particle baffle 6. At this time, under the rebound action of the return spring 73, the particle baffle 6 will return to its initial position. The advantage of this is that when the particle baffle 6 is normally blocking impurities, the cleaning mechanism 7 will not affect the airflow direction of the duct.

[0051] like Figure 6As shown, the filtration device 5 includes multiple layers of filter canisters 51. Each filter canister 51 is divided into several arc-shaped regions. Adsorbent material for adsorbing fumes is placed in the arc-shaped regions. Each arc-shaped region has an air inlet and an air outlet on both ends. Filter layers for adsorbing and treating fumes generated during welding are placed in the arc-shaped regions. The arc-shaped regions in adjacent filter canisters 51 correspond one-to-one, and the air inlet and air outlet of adjacent filter layers are connected. The air inlet and air outlet of the arc-shaped region in each filter canister 51 are located at the positions of the two adjacent arc-shaped regions.

[0052] It should be noted that the filter medium in the filter layer of filter tank 51 is a medium with strong adsorption properties, such as activated carbon and molecular sieves. In the process of adsorbing the exhaust gas generated during the welding process, the above-mentioned technical solution can filter the exhaust gas generated during the welding process multiple times, so that the exhaust gas is treated more thoroughly. At the same time, the exhaust gas can pass through the entire arc-shaped area when being filtered, so that the filtration is more thorough.

[0053] Multiple filter canisters 51 contain filter layers containing different adsorbents.

[0054] It should be noted that different adsorption media have different adsorption properties for various components in the waste gas, and their service life is also different. The content of each component in the waste gas generated by welding is also different. By placing filter layers of different adsorption substances in multiple filter canisters 51, when the filter layer in a certain filter canister 51 can no longer perform adsorption work well, it is only necessary to replace that filter canister 51.

[0055] like Figure 6 and Figure 7 As shown, the filter layer comprises different layers, each containing a different adsorbent.

[0056] It should be noted that even if the filter layer in one of the filter tanks 51 fails, the impact on the filtration effect will not be significant using the above method.

[0057] like Figure 4 , Figure 5 and Figure 8As shown, the filtration device includes a filter canister 51, which is hollowed out at both the front and back. A medium for adsorbing flue gas is placed in the filter canister 51. An agitator 511 is slidably disposed in the filter canister 51. Several slender flexible rods are distributed on the agitator 511. The agitator 511 passes through the front end of the filter canister 51 and is fixedly connected to a second sliding contact plate 512. A spring is provided between the second sliding contact plate 512 and the filter canister 51. The first sliding contact plate 71 passes through the filter fan 4 through a rod and is fixedly connected to a third sliding contact plate 42 corresponding to the second sliding contact plate 512.

[0058] It should be noted that when the first sliding contact plate 71 drives the third sliding contact plate 42 to approach and contact the second sliding contact plate 512, the second sliding contact plate 512 will drive the stirring plate to move back and forth in the filter tank 51. The flexible rod on the stirring plate will repeatedly agitate the adsorption medium in the filter tank 51. Because the utilization rate of the adsorption medium is different at different positions, the utilization rate of the adsorption medium near the filter fan 4 is relatively high, while the utilization rate of the adsorption medium far from the filter fan 4 is relatively low. By repeatedly agitating the adsorption medium in the filter tank 51 through the flexible rod on the stirring plate, the adsorption state of each part of the adsorption medium can always be kept in a uniform state, thereby extending the service life of the filter tank 51.

[0059] like Figure 2 and Figure 4 As shown, a frustum-shaped air intake shroud 8 is fixedly installed at the front end of the filter cartridge 3. The air intake shroud 8 is made of transparent material.

[0060] It should be noted that the air intake hood 8 can limit the range of movement of the exhaust gas generated during the welding process, which is more conducive to the filter fan 4 adsorbing the exhaust gas into the filter cartridge 3. The air intake hood 8 is made of transparent material so that the user can more clearly observe the welding status.

[0061] like Figure 1 and Figure 9 As shown, the clamping mechanism 2 includes a first clamping plate 21 and a second clamping plate 22. The first clamping plate 21 is fixedly mounted on the welding handle 1, and the second clamping plate 22 is slidably connected to the welding handle 1 relative to the first clamping plate 21. The first clamping plate 21 and the second clamping plate 22 extend toward the middle position of the filter cylinder 3. A spring for clamping the first clamping plate 21 and the second clamping plate 22 is fixedly installed in the welding handle 1. A pressing rod 23 for fixedly connecting with the second clamping plate 22 is also provided on the welding handle 1.

[0062] It should be noted that when changing the welding rod, pressing the pressing rod 23 will cause the second clamping plate 22 to slide, creating a gap at the ends of the first clamping plate 21 and the second clamping plate 22. Then, the welding rod is placed between the first clamping plate 21 and the second clamping plate 22. Under the tension of the spring, the first clamping plate 21 and the second clamping plate 22 can clamp the welding rod. At the same time, the first clamping plate 21 is connected to the power supply to provide power for the welding operation.

[0063] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A steel structure welding device, characterized in that, include: A welding grip (1) is provided with a clamping mechanism (2) for clamping welding rods; The filter cylinder (3) is fixedly installed on the welded handle (1). The filter cylinder (3) has a double-layer shell structure, including an inner cylinder (31) and an outer cylinder (32). The front and rear ends of the filter cylinder (3) are provided with slots for ventilation. The filter fan (4) is rotatably connected between the inner cylinder (31) and the outer cylinder (32) of the filter cylinder (3). The outer side of the filter fan (4) is uniformly machined with teeth. A drive gear (33) that meshes with the teeth on the filter fan (4) is rotatably connected in the outer cylinder (32) of the filter cylinder (3). The filter device (5) is located between the inner cylinder (31) and the outer cylinder (32) of the filter cylinder (3), and the filter device (5) is located behind the filter fan (4). A particle baffle plate (6) is provided between the inner cylinder (31) and the outer cylinder (32) of the filter cylinder (3) at the front end of the filter fan (4), and the particle baffle plate (6) is processed with dense fine holes. The particle blocking plate (6) is slidably connected to the filter cylinder (3) in the front-to-back direction. A cleaning mechanism (7) is provided between the particle blocking plate (6) and the filter fan (4). Multiple cleaning mechanisms (7) are evenly distributed along the circumference of the particle blocking plate (6). Each cleaning mechanism (7) includes a first sliding contact plate (71) and a folding plate (72). The first sliding contact plate (71) is rotatably connected to the outer side of the particle blocking plate (6). Each cleaning mechanism includes a pair of folding plates (72). Two of the folding plates (72) are respectively hinged to the front end of the first sliding contact plate (71) and the filter fan (4), and the two folding plates (72) are hinged at the middle position. A brush is provided at the end of the folding plate (72) near the particle blocking plate (6) facing the central axis of the filter cylinder (3). A return spring (73) is also provided between the first sliding contact plate (71) and the filter fan (4).

2. The steel structure welding device according to claim 1, characterized in that, The particle blocking plate (6) is slidably connected to the filter cylinder (3) in the front-back direction. A first spring (61) is fixedly connected between the outer side of the particle blocking plate (6) and the outer cylinder (32) of the filter cylinder (3). A cleaning rod (41) is fixedly connected to the front end of the filter fan (4). A brush is installed on the cleaning rod (41).

3. The steel structure welding device according to any one of claims 1 to 2, characterized in that, The filtration device (5) includes multiple layers of filter canisters (51). Each filter canister (51) is divided into several arc-shaped regions. Adsorbent material for adsorbing flue gas is placed in the arc-shaped regions. Each arc-shaped region has an air inlet and an air outlet on both ends. Filter layers for adsorbing and treating the flue gas generated during welding are placed in the arc-shaped regions. The arc-shaped regions in adjacent filter canisters (51) correspond one-to-one, and the air inlet and air outlet of adjacent filter layers are connected. The air inlet and air outlet of the arc-shaped region in each filter canister (51) are located at the positions of the two adjacent arc-shaped regions.

4. A steel structure welding device according to claim 3, characterized in that, Multiple filter canisters (51) are filled with filter layers containing different adsorbents.

5. A steel structure welding device according to claim 3, characterized in that, The filter layer comprises different layers, each containing a different adsorbent.

6. A steel structure welding device according to claim 1, characterized in that, The filtration device includes a filter canister (51), the front and back of which are hollowed out. A medium for adsorbing flue gas is placed in the filter canister (51). A stirring rod (511) is slidably arranged in the filter canister (51). Several slender flexible rods are distributed on the stirring rod (511). The stirring rod (511) passes through the front end of the filter canister (51) and is fixedly connected to a second sliding contact plate (512). A spring is provided between the second sliding contact plate (512) and the filter canister (51). The first sliding contact plate (71) passes through the filter fan (4) through a rod and is fixedly connected to a third sliding contact plate (42) corresponding to the second sliding contact plate (512).

7. A steel structure welding device according to claim 3, characterized in that, The front end of the filter cartridge (3) is fixedly equipped with a frustum-shaped air intake hood (8), which is made of transparent material.

8. A steel structure welding device according to claim 1, characterized in that, The clamping mechanism (2) includes a first clamping plate (21) and a second clamping plate (22). The first clamping plate (21) is fixedly installed on the welding handle (1). The second clamping plate (22) is slidably connected to the welding handle (1) relative to the first clamping plate (21). The first clamping plate (21) and the second clamping plate (22) extend toward the middle position of the filter cylinder (3). A spring for clamping the first clamping plate (21) and the second clamping plate (22) is fixedly installed in the welding handle (1). A pressing rod (23) for fixedly connecting with the second clamping plate (22) is also provided on the welding handle (1).

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