Sealing cover plate for pipeline argon arc welding
By using the sealing cover plate for pipeline argon arc welding, the pipe mouth is blocked and inert gas is injected, which solves the problem of continuously injecting a large amount of argon gas during the argon arc welding process, and reduces argon gas consumption and welding costs. effect.
Patent Information
- Application Number
- CN202421131469.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-05-22
AI Technical Summary
During the argon arc welding process, a large amount of argon gas needs to be continuously penetrated into the ventilation duct to maintain the air pressure difference and prevent external air from entering, resulting in a high consumption of argon gas and high welding costs.
Provide a sealing cover for a pipeline arc welding, including multiple sealing covers, intake cover and blocking cover. By blocking each pipe port of the pipeline, and connecting with the gas supply pipeline A closed space ensure that the gas concentration meets the welding requirements.
The consumption of inert gas is reduced, the welding cost is reduced, the outside gas is prevented from entering the pipeline, and the welding quality is improved.
Smart Images
Figure CN222386099U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of metal pipeline welding, and in particular to a sealing cover plate for pipeline argon arc welding. Background Art
[0002] When installing a ventilation duct for discharging acidic and alkaline waste gas, it is necessary to connect the branch pipe to the main pipe. In the prior art, argon arc welding and other welding methods are generally used to weld the branch pipe to the main pipe, so that it is not easy to have a gap at the connection between the branch pipe and the main pipe, thereby reducing the risk of leakage of acidic and alkaline waste gas in the ventilation duct.
[0003] Since argon gas is needed to protect the welding area when using argon arc welding, the branch pipe and the pre-opened welding port on the main pipe are usually spliced together to form a ventilation duct, and then any port on the ventilation duct is selected as the inflation port, and argon gas is filled into the pipe from the inflation port; after the air in the pipe is basically exhausted and the argon gas concentration in the pipe reaches the welding requirements, welding operations can be carried out to avoid the weld at the splicing point being oxidized by the oxygen in the pipe, which affects the welding quality.
[0004] However, since outside air will enter the pipe from the open pipe opening on the ventilation duct, in order to ensure that the argon concentration in the pipe always meets the welding requirements during the welding process, workers need to continuously introduce a large amount of argon into the ventilation duct to form an air pressure difference inside and outside the ventilation duct to prevent outside air from entering the pipe, resulting in high argon consumption and high welding costs.
[0005] In view of this, it is necessary to provide a sealing cover plate for pipeline argon arc welding. Utility Model Content
[0006] In order to solve the problem of high welding cost due to the need to continuously introduce a large amount of argon gas into the ventilation duct during argon arc welding, the present application provides a sealing cover plate for pipeline argon arc welding.
[0007] The present application provides a sealing cover plate for pipeline argon arc welding, which adopts the following technical solution: comprising a plurality of sealing cover plates, wherein the sealing cover plates are detachably connected to the pipe opening and can seal the pipe opening;
[0008] The sealing cover plate comprises an air inlet cover and a blocking cover. The air inlet cover is provided with an air inlet, and the air inlet can be connected to a gas supply pipeline for providing inert gas.
[0009] By adopting the above technical scheme, before welding, workers can first assemble the pipes to be welded, and then seal the various pipe openings of the pipes with sealing covers to form a relatively closed space in the pipes, and then connect the air supply pipes to the air inlet on the air inlet cover, and inject inert gases such as argon into the pipes to be welded, so that the original air in the pipes can be discharged from the joints to be welded on the pipes, and after the inert gas concentration in the pipes meets the welding requirements, the joints to be welded on the pipes are welded. The design of the sealing covers makes it difficult for external gases to enter the pipes from the various pipe openings, so that workers do not need to continuously introduce a large amount of inert gas into the pipes to ensure that the concentration of the inert gas in the pipes meets the welding requirements, thereby reducing the consumption of inert gas and reducing welding costs.
[0010] Specifically, it also includes a sealing pad, the sealing pad includes an air intake pad and a blocking pad, the air intake pad is provided with an air vent corresponding to the air intake, and the air intake cover can abut the air intake pad between the air intake cover and the pipe opening;
[0011] The blocking cover can abut the blocking pad between the blocking cover and the pipe opening.
[0012] By adopting the above technical solution, the air intake pad can block the gap between the air intake cover and the pipe mouth, and the sealing pad can block the gap between the sealing cover and the pipe mouth, so that the outside air is not easy to enter the inside of the pipeline from the gap between the pipe mouth and the air intake cover and between the pipe mouth and the sealing cover, and the inert gas inside the pipeline is not easy to leave the inside of the pipeline from these gaps, thereby reducing the consumption of inert gas and reducing welding costs.
[0013] Furthermore, the sealing cover plate further comprises a snap-fit unit, the snap-fit unit comprising a fixed snap, a movable snap and a snap moving piece, the fixed snap and the movable snap are arranged opposite to each other, the snap moving piece is in transmission connection with the movable snap and can drive the movable snap to approach or move away from the fixed snap;
[0014] A connecting flange is provided at the pipe mouth of the pipe to be welded. When the movable buckle approaches the fixed buckle, the movable buckle and the fixed buckle can abut against the side of the connecting flange facing away from the sealing cover plate to connect the sealing cover plate to the pipe mouth.
[0015] By adopting the above technical solution, workers can first clamp the fixed buckle on the flange of the connecting flange, and then use the buckle moving part to drive the movable buckle close to the fixed buckle, so that the movable buckle is also clamped with the flange of the connecting flange, so that the sealing cover plate can be connected to the pipe mouth of the pipe to be welded; after welding, workers can first use the buckle moving part to drive the movable buckle away from the fixed buckle and separate it from the connecting flange, and then remove the sealing cover plate from the connecting flange.
[0016] Furthermore, the buckle moving part includes a rotating seat, a rotating rod, a rotating shaft and a connecting rod. The rotating seat is arranged on a side plate surface of the sealing cover plate facing away from the pipe opening. One end of the rotating rod is hinged to the rotating seat, and the other end of the rotating rod can rotate in a direction close to or away from the fixed buckle.
[0017] The rotating shaft is rotatably connected to the rod body of the rotating rod, one end of the connecting rod is connected to the rotating shaft, and the other end of the connecting rod is connected to the movable buckle and can rotate in a direction close to or away from the fixed buckle.
[0018] By adopting the above technical solution, workers can rotate the rotating rod to drive the rotating shaft, the connecting rod and the movable buckle to move toward the fixed buckle, so as to connect the sealing cover plate to the pipe mouth of the pipeline; or rotate the rotating rod to drive the rotating shaft, the connecting rod and the movable buckle to move away from the fixed buckle, so as to remove the sealing cover plate from the pipe mouth of the pipeline.
[0019] Furthermore, the buckle movable member includes an adjusting screw, a limiting clamp, a connecting rod and a sliding rod, and the sealing cover plate is provided with a fixing through hole adapted to the adjusting screw, and the adjusting screw can be screwed to the fixing through hole;
[0020] The limiting clamp is arranged on the plate surface of the sealing cover plate and a limiting sliding hole is formed between the two;
[0021] A collar is rotatably connected to the rod body of the adjusting screw, one end of the connecting rod is hinged to the collar, the other end of the sliding rod passes through the limiting sliding hole and is connected to the movable buckle, and the sliding rod can slide in a direction close to or away from the fixed buckle.
[0022] By adopting the above technical solution, when the adjusting screw is screwed out of the fixed through hole, the adjusting screw will move with the collar in the direction away from the sealing cover plate, so that the sliding rod and the movable buckle can be driven by the connecting rod to move in the direction close to the fixed buckle, so that the sealing cover plate can be connected to the pipe mouth of the pipeline; when the adjusting screw is screwed into the fixed through hole, the adjusting screw will move with the connecting rod and the connection between the adjusting screw in the direction close to the sealing cover plate, so that the sliding rod and the movable buckle can be driven by the connecting rod to move in the direction away from the fixed buckle, so that the sealing cover plate can be separated from the pipe mouth of the pipeline; the adjusting screw can cooperate with the internal thread in the fixed through hole to achieve self-locking, so that during the welding process, it is not easy for the sealing cover plate to be affected by external forces such as shaking and vibration, which may cause the connection between the sealing cover plate and the pipe mouth to loosen, resulting in external oxygen entering the pipeline from the gap between the sealing cover plate and the pipe mouth, and then oxidizing the weld.
[0023] Furthermore, a hand wheel is provided at one end of the adjusting screw away from the sealing cover plate.
[0024] By adopting the above technical solution, the design of the hand wheel enables workers to turn the adjusting screw without other tools, thereby making it convenient for workers to use the sealing cover.
[0025] Furthermore, a clearance groove is provided on the sealing cover plate, and the movable buckle can approach or move away from the fixed buckle along the clearance groove.
[0026] By adopting the above technical solution, the movable buckle can approach or move away from the fixed buckle along the clearance groove, so as to expand the adjustment range of the distance between the movable buckle and the fixed buckle, so that the sealing cover plate can also be connected to a connecting flange with a smaller radius than itself.
[0027] Specifically, the air inlet cover is provided with a gas sensor, a controller and a buzzer, the gas sensor can detect the concentration of the inert gas in the pipe to be welded, and the gas sensor is electrically connected to the controller and can feed back the detection result to the controller, and the controller is electrically connected to the buzzer and can control the switch of the buzzer according to the detection result.
[0028] By adopting the above technical solution, when workers are welding the pipeline, the gas sensor can detect the concentration of the inert gas in the welding pipeline and feed back the detection result to the controller. When the concentration of the inert gas in the pipeline to be welded reaches the welding requirement, the controller will turn off the buzzer. When the controller determines that the concentration of the inert gas in the pipeline to be welded is lower than the welding requirement, the controller will turn on the buzzer to prompt the worker to stop welding and introduce more inert gas into the pipeline, thereby ensuring that the inert gas in the pipeline always meets the welding requirements and reducing the risk of oxidation by oxygen at the welding point.
[0029] In summary, this application includes the following beneficial technical effects:
[0030] The utility model comprises a plurality of sealing cover plates, which are detachably connected to the pipe openings and can seal the pipe openings; the sealing cover plates comprise an air inlet cover and a sealing cover, the air inlet cover is provided with an air inlet, which can be connected to an air supply pipe for providing inert gas, so that workers can first assemble the pipes to be welded before welding, and then seal the various pipe openings of the pipes with the sealing cover plates, so as to form a relatively closed space in the pipes, and then connect the air supply pipes to the air inlet ports on the air inlet cover, and inject inert gas such as argon into the pipes to be welded, and the original air in the pipes will be discharged from the joints to be welded on the pipes, and after the inert gas concentration in the pipes meets the welding requirements, the joints to be welded on the pipes are welded, and the design of the sealing cover plates makes it difficult for external gas to enter the pipes from the various pipe openings of the pipes, so that workers do not need to continuously introduce a large amount of inert gas into the pipes, and the concentration of the inert gas in the pipes can be ensured to meet the welding requirements, thereby reducing the consumption of inert gas and reducing the welding cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 It is a three-dimensional diagram of a sealing cover plate for pipeline argon arc welding of the present application;
[0032] Figure 2 yes Figure 1 A schematic enlarged view of the area A, showing the snap-fit moving part;
[0033] Figure 3 is a three-dimensional diagram of another embodiment provided by the present application;
[0034] Figure 4 is along Figure 3 A schematic cross-sectional view taken along the center axis of the middle adjusting screw, in which only the air inlet cover and part of the pipe to be welded are shown.
[0035] Figure numerals: 1. Sealing cover plate; 11. Air inlet cover; 111. Connecting pipe; 112. Gas sensor; 113. Buzzer; 12. Sealing cover; 13. Snap-on unit; 131. Fixed snap; 132. Movable snap; 133. Clip moving part; 1331. Rotating seat; 1332. Rotating rod; 1333. Rotating shaft; 1334. Connecting rod; 1335. Adjusting screw; 1336. Limiting clamp; 1337. Connecting rod; 1338. Sliding rod; 1339. Handwheel; 2. Pipeline to be welded; 21. Connecting flange; 3. Sealing pad. DETAILED DESCRIPTION
[0036] Figure 1 This is a three-dimensional diagram of a sealing cover plate for pipeline argon arc welding of the present application. Figure 2yes Figure 1 Schematic enlargement of area A in FIG, showing the snap-fit moving parts. Figure 1 and Figure 2 A sealing cover plate for pipeline argon arc welding provided in the present application includes: multiple sealing cover plates 1, which are detachably connected to the pipe mouth and can seal the pipe mouth; the sealing cover plate 1 includes an air inlet cover 11 and a sealing cover 12, and the air inlet cover 11 is provided with an air inlet, and a connecting pipe 111 is provided at the air inlet, and the connecting pipe 111 can be connected to a gas supply pipe for providing inert gas. Since the present application adopts argon arc welding technology to weld the pipeline, the inert gas provided is limited to argon gas.
[0037] Through the above design, before welding, the worker can first assemble the pipe 2 to be welded to form a three-way pipe, and then use the sealing cover plate 1 to seal the various pipe openings of the pipe (actually using an air inlet cover 11 and two sealing covers 12) to form a relatively closed space in the pipe, so that the external gas is not easy to enter the pipe from the various pipe openings of the pipe; then the air supply pipe is connected to the connecting pipe 111 on the air inlet cover 11, and argon gas is injected into the pipe 2 to be welded, so that the original air in the pipe can be discharged from the joint to be welded on the pipe. After the argon concentration in the pipe meets the welding requirements, the joint to be welded on the pipe is welded. The design of the sealing cover plate 1 ensures that the workers do not need to continuously introduce a large amount of argon into the pipe to ensure that the concentration of argon in the pipe meets the welding requirements, thereby reducing the consumption of argon and reducing welding costs.
[0038] See also Figure 1 and Figure 2 A sealing cover plate for pipeline argon arc welding also includes a sealing pad 3, which can be a sealing pad 3 made of rubber. The sealing pad 3 includes an air intake pad and a sealing pad. An air vent corresponding to the air inlet is provided on the air intake pad. The air intake cover 11 can abut the air intake pad between the air intake cover 11 and the pipe mouth, and the sealing cover 12 can abut the sealing pad between the sealing cover 12 and the pipe mouth, so that the outside air is not easy to enter the inside of the pipeline from the gap between the pipe mouth and the air intake cover 11 and the pipe mouth and the sealing cover 12, and the argon gas inside the pipeline is not easy to leave the inside of the pipeline from these gaps, thereby reducing the consumption of argon gas and reducing the welding cost.
[0039] See also Figure 1 and Figure 2, the sealing cover plate 1 further includes a clamping unit 13. The clamping unit 13 includes a pair of fixed buckles 131, a pair of movable buckles 132 and a buckle moving member 133. Each fixed buckle 131 is disposed opposite to a corresponding movable buckle 132. The fixed buckle 131 has a U-shaped structure. One end of it is welded to the sealing cover plate 1, and the other end can be clamped with the connecting flange 21. The buckle moving member 133 is传动连接 with the movable buckle 132 and can drive the movable buckle 132 to approach or move away from the fixed buckle 131. A connecting flange 21 is provided at the pipe orifice of the pipe 2 to be welded. When the movable buckle 132 approaches the fixed buckle 131, both the movable buckle 132 and the fixed buckle 131 can abut against the side of the connecting flange 21 facing away from the sealing cover plate 1, so that the sealing cover plate 1 is connected to the pipe orifice.
[0040] With the above design, the worker can first clamp the two fixed buckles 131 on the flange of the connecting flange 21, and then use the buckle moving member 133 to drive each movable buckle 132 to approach a corresponding fixed buckle 131, so that each movable buckle 132 is also clamped with the flange of the connecting flange 21, thereby enabling the sealing cover plate 1 to be connected to the pipe orifice of the pipe 2 to be welded. After the welding is completed, the worker can first use the buckle moving member 133 to drive the movable buckle 132 to move away from the fixed buckle 131 and separate from the connecting flange 21, and then remove the sealing cover plate 1 from the connecting flange 21.
[0041] Specifically, the buckle moving member 133 can use a buckle, which includes a rotating seat 1331, a rotating rod 1332, a rotating shaft 1333 and a connecting rod 1334. The rotating seat 1331 is provided on the side surface of the sealing cover plate 1 facing away from the pipe orifice. One end of the rotating rod 1332 is in a relatively tight hinged relationship with the rotating seat 1331, that is, the worker needs to扳动 to make the rotating rod 1332 rotate, and the rotating rod 1332 cannot rotate by itself. The other end of the rotating rod 1332 can rotate in the direction of approaching or moving away from the fixed buckle 131. The rotating shaft 1333 is rotatably connected to the rod body of the rotating rod 1332. One end of the connecting rod 1334 is connected to the rotating shaft 1333, and the other end of the connecting rod 1334 is connected to the movable buckle 132 and can rotate in the direction of approaching or moving away from the fixed buckle 131, so that the worker can drive the rotating shaft 1333, the connecting rod 1334 and the movable buckle 132 to move in the direction of approaching the fixed buckle 131 by rotating the rotating rod 1332, thereby enabling the sealing cover plate 1 to be connected to the pipe orifice; or drive the rotating shaft 1333, the connecting rod 1334 and the movable buckle 132 to move in the direction of moving away from the fixed buckle 131 by rotating the rotating rod 1332, so as to be able to remove the sealing cover plate 1 from the pipe orifice.
[0042] Figure 3 is a perspective view of another embodiment provided by the present application. Figure 4is along Figure 3 A schematic cross-sectional view of the central axis of the adjusting screw, in which only the air inlet cover and part of the pipe to be welded are shown. Figure 3 and Figure 4 In another embodiment provided in the present application, the buckle moving member 133 includes an adjusting screw 1335, a pair of limiting clamps 1336, a pair of connecting rods 1337 and a pair of sliding rods 1338. A fixing through hole adapted to the adjusting screw 1335 is opened on the sealing cover plate 1. The adjusting screw 1335 can be screwed with the fixing through hole. A pair of limiting clamps 1336 are arranged at intervals around the adjusting screw 1335. Each limiting clamp 1336 is screwed on the plate surface of the sealing cover plate 1 and is fixed between the two. A limiting sliding hole adapted to the sliding rod 1338 is formed therein, and a ring is rotatably connected to the rod body of the adjusting screw 1335. One end of each connecting rod 1337 is hinged to the ring, and the other end of each connecting rod 1337 is hinged to one end of a corresponding sliding rod 1338. The other end of each sliding rod 1338 can pass through a corresponding limiting sliding hole and be connected to a corresponding movable buckle 132, so as to be able to drive the movable buckle 132 to approach or move away from the corresponding fixed buckle 131.
[0043] With the above design, in the process of screwing the adjusting screw 1335 outward from the fixed through hole, the adjusting screw 1335 will move together with the collar and the connection between each connecting rod 1337 and the collar in a direction away from the sealing cover plate 1, so that each connecting rod 1337 can drive the corresponding sliding rod 1338 and the movable buckle 132 to move together in a direction close to the fixed buckle 131, so that the sealing cover plate 1 can be connected to the pipe mouth of the pipeline; in the process of screwing the adjusting screw 1335 into the fixed through hole, the adjusting screw 1335 will move together with each connecting rod 1337 and the connection between the adjusting screw 1335 The connecting rod 1337 can move together with the sliding rod 1338 and the movable buckle 132 in a direction away from the fixed buckle 131, so that the sealing cover plate 1 can be separated from the pipe mouth of the pipeline; the adjusting screw 1335 can cooperate with the internal thread in the fixed through hole to achieve self-locking, so that during the welding process, it is not easy for the sealing cover plate 1 to be affected by external forces such as shaking and vibration, which may cause the connection between the sealing cover plate 1 and the pipe mouth to loosen, resulting in external oxygen entering the pipeline from the gap between the sealing cover plate 1 and the pipe mouth, and then oxidizing the weld.
[0044] Specifically, an air inlet hole can be opened on the adjusting screw 1335 of the air inlet cover 11, and the air inlet hole runs through the entire length direction of the adjusting screw 1335. The connecting pipe 111 is connected to the air inlet hole, so that workers can inject argon gas into the pipe 2 to be welded through the cooperation of the connecting pipe 111 and the air inlet hole, without opening an air inlet port on the air inlet cover 11.
[0045] Specifically, a handwheel 1339 can be provided on the end of the adjusting screw 1335 away from the sealing cover plate 1, so that workers can turn the adjusting screw 1335 without other tools, thereby facilitating the workers to use the sealing cover plate 1. A clearance groove can also be provided on the sealing cover plate 1, and the movable buckle 132 can approach or move away from the fixed buckle 131 along the clearance groove, so as to expand the adjustment range of the distance between the movable buckle 132 and the fixed buckle 131, so that the sealing cover plate 1 can also be connected to a connecting flange 21 having a smaller radius than itself.
[0046] See also Figure 3 and Figure 4 A gas sensor 112, a controller (not shown in the figure) and a buzzer 113 are arranged on the air inlet cover 11. The gas sensor 112 can detect the concentration of argon gas in the pipe 2 to be welded, and the gas sensor 112 is electrically connected to the controller and can feed back the detection result to the controller. The controller is electrically connected to the buzzer 113 and can control the switch of the buzzer 113 according to the detection result, so that when the worker welds the pipe, the gas sensor 112 can detect the concentration of argon gas in the welding pipe and feed back the detection result to the controller. When the argon concentration in the pipe 2 to be welded reaches the welding requirement, the controller will turn off the buzzer 113. When the controller determines that the argon concentration in the pipe 2 to be welded is lower than the welding requirement, the controller will turn on the buzzer 113 to prompt the worker to stop welding and introduce more argon gas into the pipe, so as to ensure that the argon gas in the pipe always meets the welding requirements and reduce the risk of oxidation by oxygen at the welding point.
[0047] The working principle of a sealing cover plate for pipeline argon arc welding in the present application is as follows:
[0048] Before welding, workers can first assemble the pipe 2 to be welded, and then seal the various pipe openings of the pipe with the sealing cover 1 to form a relatively closed space in the pipe, and then connect the air supply pipe to the air inlet on the air inlet cover 11, and inject argon into the pipe 2 to be welded, and the original air in the pipe will be discharged from the joint to be welded on the pipe. After the argon concentration in the pipe meets the welding requirements, the joint to be welded on the pipe is welded. The design of the sealing cover 1 eliminates the need for workers to continuously introduce a large amount of argon into the pipe, and can ensure that the argon concentration in the pipe meets the welding requirements, thereby reducing the consumption of argon and reducing welding costs.
[0049] It should be noted that the above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A sealing cover plate for pipeline argon arc welding, used for sealing the pipe opening of a pipeline (2) to be welded, characterized in that: It comprises a plurality of sealing cover plates (1), wherein the sealing cover plates (1) are detachably connected to the pipe opening and are capable of sealing the pipe opening; The sealing cover plate (1) comprises an air inlet cover (11) and a blocking cover (12); the air inlet cover (11) is provided with an air inlet, and the air inlet can be connected to a gas supply pipeline for providing inert gas.
2. A sealing cover plate for pipeline argon arc welding according to claim 1, characterized in that: It also comprises a sealing pad (3), the sealing pad (3) comprising an air intake pad and a blocking pad, the air intake pad being provided with an air vent corresponding to the air intake port, the air intake cover (11) being capable of abutting the air intake pad between the air intake cover (11) and the pipe port; The blocking cover (12) can abut the blocking pad between the blocking cover (12) and the pipe opening.
3. The sealing cover plate for pipeline argon arc welding according to claim 1, characterized in that: The sealing cover plate (1) further comprises a snap-fit unit (13), the snap-fit unit (13) comprising a fixed snap-fit (131), a movable snap-fit (132) and a snap-fit moving piece (133), the fixed snap-fit (131) and the movable snap-fit (132) being arranged opposite to each other, the snap-fit moving piece (133) being transmission-connected with the movable snap-fit (132) and capable of driving the movable snap-fit (132) to approach or move away from the fixed snap-fit (131); A connecting flange (21) is provided at the pipe mouth of the pipe (2) to be welded, and when the movable buckle (132) is close to the fixed buckle (131), the movable buckle (132) and the fixed buckle (131) can both abut against a side of the connecting flange (21) facing away from the sealing cover plate (1), so that the sealing cover plate (1) is connected to the pipe mouth.
4. The sealing cover plate for pipeline argon arc welding according to claim 3 is characterized in that: The buckle moving part (133) comprises a rotating seat (1331), a rotating rod (1332), a rotating shaft (1333) and a connecting rod (1334); the rotating seat (1331) is arranged on a side plate surface of the sealing cover plate (1) which faces away from the pipe opening; one end of the rotating rod (1332) is hinged to the rotating seat (1331); and the other end of the rotating rod (1332) can rotate in a direction close to or away from the fixed buckle (131); The rotating shaft (1333) is rotatably connected to the rod body of the rotating rod (1332), one end of the connecting rod (1334) is connected to the rotating shaft (1333), and the other end of the connecting rod (1334) is connected to the movable buckle (132) and can rotate in a direction close to or away from the fixed buckle (131).
5. The sealing cover plate for pipeline argon arc welding according to claim 3, characterized in that: The buckle movable member (133) comprises an adjusting screw (1335), a limiting clamp (1336), a connecting rod (1337) and a sliding rod (1338); a fixing through hole adapted to the adjusting screw (1335) is provided on the sealing cover plate (1); and the adjusting screw (1335) can be screwed to the fixing through hole; The limiting clamp (1336) is arranged on the plate surface of the sealing cover plate (1) and a limiting sliding hole is formed between the two; A collar is rotatably connected to the shaft of the adjusting screw (1335); one end of the connecting rod (1337) is hinged to the collar; the other end of the connecting rod (1337) is hinged to one end of the sliding rod (1338); the other end of the sliding rod (1338) passes through the limiting sliding hole and is connected to the movable buckle (132); and the sliding rod (1338) can slide in a direction approaching or away from the fixed buckle (131).
6. A sealing cover plate for pipeline argon arc welding according to claim 5, characterized in that: A hand wheel (1339) is provided at one end of the adjusting screw (1335) away from the sealing cover plate (1).
7. The sealing cover plate for pipeline argon arc welding according to claim 5, characterized in that: The sealing cover plate (1) is provided with a clearance groove, and the movable buckle (132) can move closer to or farther away from the fixed buckle (131) along the clearance groove.
8. The sealing cover plate for pipeline argon arc welding according to claim 1, characterized in that: The air inlet cover (11) is provided with a gas sensor (112), a controller and a buzzer (113); the gas sensor (112) is capable of detecting the concentration of the inert gas in the pipe (2) to be welded, and the gas sensor (112) is electrically connected to the controller and is capable of feeding back the detection result to the controller; the controller is electrically connected to the buzzer (113) and is capable of controlling the switch of the buzzer (113) according to the detection result.