CN215787362U - Prevent that bellows from beating circumferential weld welding machine of rolling up - Google Patents

Abstract

The utility model discloses a circumferential weld welding machine for avoiding corrugated pipe coiling, which relates to the technical field of welding machines and comprises a frame, wherein a table top plate is fixedly welded at the top of the frame, a rotary mechanism is fixedly arranged on the upper surface of the table top plate, a welding chamber is fixedly arranged at the top of the rotary mechanism, a welding gun fine-tuning mechanism is fixedly arranged on the upper surface of the table top plate, the welding gun fine-tuning mechanism comprises a translation device, a positioning device is arranged on the front surface of the translation device, a pressing mechanism is fixedly arranged on the upper surface of the table top plate, in the utility model, a stepping motor is adopted to drive a welding gun to rotate, the corrugated pipe is fixed in the middle through an air cylinder clamp, relative to the welding machine, the corrugated pipe and a connecting joint are fixed, the welding gun welds a circle 360 degrees around a circumferential weld needing to be welded at a fixed distance, so that a required circumferential weld is obtained, and the phenomenon of coiling of a long-wave corrugated pipe is solved, therefore, the problem of difficult welding of the long corrugated pipe is solved, and the operating skill requirement of operators is reduced.

Description

Prevent that bellows from beating circumferential weld welding machine of rolling up

Technical Field

The utility model relates to the technical field of welding machines, in particular to a girth welding machine capable of avoiding corrugated pipe coiling.

Background

The circular seam welding machine is a universal automatic welding device capable of completing various circular and circular seam welding, and the gas corrugated pipe is connected with other pipelines or valves by using a joint which is required to be welded and connected at the connecting end part of the corrugated pipe.

Chinese patent publication No. CN102974914B discloses a bellows circumferential weld welding machine, which describes that "including a support, further including a welding gun moving mechanism connected to an upper portion of the support for driving a welding gun to move and a weldment rotating mechanism connected to a lower portion of the support for driving a weldment to rotate, the welding gun moving mechanism moves relative to the support to adjust a welding position, the weldment rotating mechanism drives the weldment to rotate continuously in a welding process so that a welding flux forms an annular weld on the weldment", the bellows circumferential weld welding machine can accurately control the welding position, improve welding quality, simplify welding operation, and has high degree of automation.

Chinese patent publication No. CN209477561U discloses a bellows circumferential weld welding machine, which "comprises a machine body, wherein a worktable is disposed on the upper surface of the machine body, a support plate is disposed on the upper surface of the worktable, a support frame is disposed on the upper surface of the support plate, a hydraulic cylinder is disposed on the upper surface of the support frame, a hydraulic telescopic rod is disposed on the outer wall of the hydraulic cylinder, a welding gun is disposed at one end of the hydraulic telescopic rod, an adjusting knob is disposed at one end of the welding gun, a handle is disposed at one side of the adjusting knob, a trigger is disposed on the outer wall of the handle, a welding nozzle is disposed at the other end of the welding gun, a servo motor is disposed at one side of the support frame, a fixing member is disposed at one side of the servo motor, a fixing plate is disposed inside the fixing member, a fixing groove is disposed inside the fixing plate, and the device plays a role of holding the bellows through a holding cylinder, thereby the problem that the corrugated pipe is misplaced in the process of girth welding is effectively avoided.

However, the adopted method is to clamp the pipe by using a welding positioner, the pipe is driven to rotate by a motor, a welding gun is fixed on a base, the welding joint is positioned at the welding joint by a cylinder, the connecting pipe is ignited to self-melt and connect the welding surface which is processed in advance by the corrugated pipe, and the welding surface is turned for a circle and then is extinguished, so that a circular seam is formed, the required connecting joint of the corrugated pipe is welded, but the length of a gas connecting pipeline is short, the transmission mode used by welding equipment is to use the pipe to rotate and weld, so that the short pipes have no problem, but for the long pipe, the resistance of the rotating pipe is very large, the welding quality is sometimes influenced, a certain torsion is added to the pipe, and the requirement on the operating skill of an operator is too high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a girth welding machine for avoiding corrugated pipe coiling.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an avoid bellows to beat circumferential weld welding machine of rolling up, includes the frame, the fixed welding in top of frame has the deck plate, the last fixed surface of deck plate installs rotation mechanism, rotation mechanism's top fixed mounting has the welding chamber, the last fixed surface of deck plate installs welder fine-tuning, welder fine-tuning includes the translation device, the front of translation device is provided with positioner, the last fixed surface of deck plate installs hold-down mechanism, the inside of frame is provided with the argon arc welding machine, the inside of frame is provided with pneumatic system, the inside fixed mounting of frame has electrical apparatus system, the inside fixed mounting of frame has mercury sliding ring, the top of mercury sliding ring is provided with a plurality of fluid sliding rings.

Preferably, rotation mechanism includes step motor, step motor's output fixedly connected with output shaft, step motor's the fixed cover of output shaft has connect the gear, gear engagement has slewing bearing, slewing bearing's outer lane passes through screw fixedly connected with gyration panel, slewing bearing's inner circle passes through screw and deck plate fixed connection, starts step motor, and step motor passes through the output shaft and drives gear revolve, and the gear drives gyration panel through slewing bearing and rotates.

Preferably, the translation device includes the translation seat, the last fixed surface of translation seat and gyration panel is connected, the outer wall of translation seat rotates and is connected with the lead screw, the outer wall threaded connection of lead screw has the removal seat, the top fixedly connected with of lead screw changes the handle, and manual rotation changes the handle, changes the handle and drives the lead screw rotation, and the lead screw can drive and remove the seat and reciprocate.

Preferably, the positioning device comprises a sliding table, a first air cylinder is fixedly mounted on the outer wall of one side of the sliding table, the output end of the first air cylinder is fixedly connected with the mounting seat, a sliding rail is fixedly mounted on the outer wall of the sliding table, the sliding rail is connected with the mounting seat in a sliding manner, the first air cylinder is started, and the first air cylinder drives the mounting seat to move.

Preferably, the argon arc welding machine includes welder, welder and mount pad fixed connection, during mount pad horizontal migration, can drive welder horizontal migration, fix a position welder to the welding seam department of bellows through first cylinder, remove the back outer wall fixed connection of seat and slip table, remove the seat and can drive the slip table and move from top to bottom to adjustment welder's height, thereby can finely tune the height of welder according to the position of welding seam.

Preferably, hold-down mechanism includes the support frame, the support frame is connected with the last fixed surface of deck plate, the top fixed mounting of support frame has the second cylinder, the output fixedly connected with cylinder anchor clamps of second cylinder, cylinder anchor clamps are located the welding chamber directly over, start cylinder anchor clamps, carry out the centre gripping to the bellows through cylinder anchor clamps to fix the bellows, start the second cylinder, the second cylinder drives cylinder anchor clamps downstream, and cylinder anchor clamps drive the bellows downstream, because the bellows has certain elasticity, thereby make the bellows exert pressure on the surface to the attach fitting, make bellows and attach fitting closely.

Preferably, the welding chamber comprises a base, the bottom of the base is fixedly connected with the rotary panel through screws, the base is positioned in the middle of the rotary panel, a cylinder is welded on the upper surface of the base, a first opening is formed in the side wall of one side of the cylinder, an observation window is fixedly installed on the other side of the cylinder, a positioning seat is rotatably connected inside the cylinder, a second opening is formed in the top of the cylinder, an air inlet pipe is fixedly connected to the input end of the bottom of the cylinder, the other end of the air inlet pipe is connected with a fluid slip ring, the other end of the fluid slip ring is connected with an air tank filled with inert gas, a connecting joint is placed into the cylinder through the second opening, the positioning seat is sleeved with the connecting joint, a corrugated pipe is inserted into the cylinder through the second opening, the corrugated pipe is sleeved with the positioning seat, and the port of the corrugated pipe is in contact with the connecting joint, the positioning seat is used for keeping the corrugated pipe and the connecting joint in concentricity and enabling the central axis of the corrugated pipe and the central axis of the connecting joint to be on the same straight line.

Preferably, the first opening and the welding gun are located on the same side and correspond to each other, and the argon arc welding machine, the welding gun and the mercury slip ring are electrically connected.

The utility model has the beneficial effects that:

1. according to the welding machine, the stepping motor is adopted to drive the welding gun to rotate, the corrugated pipe is fixed in the middle through the air cylinder clamp, the corrugated pipe and the connecting joint are fixed relative to the welding machine, the welding gun welds a circle of 360 degrees around a circumferential weld needing to be welded at a fixed distance, so that the required circumferential weld is obtained, the rolling phenomenon of the long-wave corrugated pipe is solved, the problem of difficulty in welding the long-wave corrugated pipe is solved, and the operating skill requirement of an operator is lowered.

2. According to the utility model, through the design of the welding chamber, a certain amount of inert gas is introduced into the welding chamber to form a closed welding chamber, so that a welding bead in the welding process is protected from being oxidized, and the risk of welding seam leakage is reduced.

3. In the utility model, the cylinder clamp is driven by the second cylinder to move downwards, the corrugated pipe is driven by the cylinder clamp to move downwards, and the corrugated pipe has certain elasticity, so that the corrugated pipe applies pressure on the surface of the connecting joint, the corrugated pipe is tightly attached to the connecting joint, the risk of welding seam leakage is further reduced,

4. according to the utility model, when the mounting seat moves horizontally, the mounting seat can drive the welding gun to move horizontally, the welding gun is positioned at the welding seam of the corrugated pipe through the first air cylinder, and meanwhile, the moving seat can drive the sliding table to move up and down, so that the height of the welding gun is adjusted, and the height of the welding gun can be finely adjusted according to the position of the welding seam.

Drawings

FIG. 1 is a front view of a girth welding machine of the present invention that avoids bellows curling.

FIG. 2 is a side view of a girth weld of the present invention to avoid the curling of the bellows.

FIG. 3 is a schematic structural diagram of a swing mechanism of a girth welding machine for preventing corrugated pipe from being curled according to the present invention.

FIG. 4 is a schematic structural diagram of a pivoting support of a girth welding machine for preventing corrugated pipe from being curled according to the present invention.

FIG. 5 is a schematic structural diagram of a welding gun fine adjustment mechanism of a circumferential weld machine for preventing corrugated pipe from being curled according to the present invention.

FIG. 6 is a schematic structural diagram of a translation device of a girth welding machine for preventing corrugated pipes from being curled according to the present invention.

FIG. 7 is a schematic structural diagram of a positioning device of a girth welding machine for preventing corrugated pipes from being curled according to the present invention.

FIG. 8 is a schematic view of the structure of the welding gun of a girth welding machine for avoiding the coiling of corrugated pipes according to the present invention.

FIG. 9 is a schematic structural diagram of a pressing mechanism of a girth welding machine for preventing corrugated pipes from being curled according to the present invention.

FIG. 10 is a schematic diagram of the welding chamber of a girth welding machine for avoiding the coiling of corrugated pipes according to the present invention.

Reference numbers in the figures: 1. a frame; 2. a table top plate; 3. a swing mechanism; 301. a stepping motor; 302. a gear; 303. a slewing bearing; 304. a rotating panel; 4. a welding gun fine adjustment mechanism; 401. a translation device; 40101. a translation seat; 40102. a lead screw; 40103. a movable seat; 40104. turning a handle; 402. a positioning device; 40201. a sliding table; 40202. a first cylinder; 40203. a slide rail; 40204. a mounting seat; 5. a hold-down mechanism; 501. a support frame; 502. a second cylinder; 503. a cylinder clamp; 6. an electrical system; 7. an argon arc welding machine; 701. a welding gun; 8. a welding chamber; 801. a base; 802. a cylinder; 803. a first opening; 804. an observation window; 805. positioning seats; 806. a second opening; 807. an air inlet pipe; 9. a pneumatic system; 10. a mercury slip ring; 11. a fluid slip ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example (b):

as shown in figures 1 to 10:

the utility model provides a avoid bellows to beat girth welding machine of rolling up, which comprises a frame 1, the fixed welding in top of frame 1 has deck plate 2, the last fixed surface of deck plate 2 installs rotation mechanism 3, the top fixed mounting of rotation mechanism 3 has welding chamber 8, the last fixed surface of deck plate 2 installs welder fine-tuning 4, welder fine-tuning 4 includes translation device 401, translation device 401's front is provided with positioner 402, the last fixed surface of deck plate 2 installs hold-down mechanism 5, the inside of frame 1 is provided with argon arc welding machine 7, the inside of frame 1 is provided with pneumatic system 9, the inside fixed mounting of frame 1 has electrical system 6, the inside fixed mounting of frame 1 has mercury sliding ring 10, the top of mercury sliding ring 10 is provided with a plurality of fluid sliding rings 11.

Referring to fig. 3-4, the swing mechanism 3 includes a stepping motor 301, an output end of the stepping motor 301 is fixedly connected with an output shaft, the output shaft of the stepping motor 301 is fixedly sleeved with a gear 302, the gear 302 is engaged with a swing support 303, an outer ring of the swing support 303 is fixedly connected with a swing panel 304 through a screw, an inner ring of the swing support 303 is fixedly connected with the deck panel 2 through a screw, the stepping motor 301 is started, the stepping motor 301 drives the gear 302 to rotate through the output shaft, and the gear 302 drives the swing panel 304 to rotate through the swing support 303.

Referring to fig. 5-6, the translation device 401 includes a translation base 40101, the translation base 40101 is fixedly connected to the upper surface of the rotation panel 304, the outer wall of the translation base 40101 is rotatably connected to a lead screw 40102, the outer wall of the lead screw 40102 is in threaded connection with a movable base 40103, the top end of the lead screw 40102 is fixedly connected to a rotating handle 40104, the rotating handle 40104 is manually rotated, the rotating handle 40104 drives the lead screw 40102 to rotate, and the lead screw 40102 can drive the movable base 40103 to move up and down.

Referring to fig. 7, the positioning device 402 includes a sliding table 40201, a first cylinder 40202 is fixedly installed on an outer wall of one side of the sliding table 40201, an output end of the first cylinder 40202 is fixedly connected to an installation seat 40204, a sliding rail 40203 is fixedly installed on an outer wall of the sliding table 40201, the sliding rail 40203 is slidably connected to the installation seat 40204, the first cylinder 40202 is started, and the first cylinder 40202 drives the installation seat 40204 to move.

Referring to fig. 5-7, the argon arc welding machine 7 includes a welding gun 701, the welding gun 701 is fixedly connected with a mounting seat 40204, when the mounting seat 40204 moves horizontally, the welding gun 701 can be driven to move horizontally, the welding gun 701 is positioned at a welding seam of the corrugated pipe through a first cylinder 40202, a movable seat 40103 is fixedly connected with the outer wall of the back of the sliding table 40201, and the movable seat 40103 can drive the sliding table 40201 to move up and down, so that the height of the welding gun 701 can be adjusted, and the height of the welding gun 701 can be finely adjusted according to the position of the welding seam.

Referring to fig. 9, the pressing mechanism 5 includes a supporting frame 501, the supporting frame 501 is fixedly connected to the upper surface of the deck plate 2, a second cylinder 502 is fixedly installed at the top of the supporting frame 501, an output end of the second cylinder 502 is fixedly connected to a cylinder clamp 503, the cylinder clamp 503 is located right above the welding chamber 8, the cylinder clamp 503 is started, the corrugated pipe is clamped by the cylinder clamp 503, so that the corrugated pipe is fixed, the second cylinder 502 is started, the second cylinder 502 drives the cylinder clamp 503 to move downwards, the cylinder clamp 503 drives the corrugated pipe to move downwards, and because the corrugated pipe has certain elasticity, the corrugated pipe applies pressure to the surface of the connection joint, so that the corrugated pipe is tightly attached to the connection joint.

Referring to fig. 10, the welding chamber 8 includes a base 801, the bottom of the base 801 is fixedly connected to the rotating panel 304 through screws, the base 801 is located in the middle of the rotating panel 304, a cylinder 802 is welded to the upper surface of the base 801, a first opening 803 is formed in a side wall of the cylinder 802, an observation window 804 is fixedly installed on the other side of the cylinder 802, a positioning seat 805 is rotatably connected to the inside of the cylinder 802, a second opening 806 is formed in the top of the cylinder 802, an air inlet pipe 807 is fixedly connected to an input end of the bottom of the cylinder 802, the other end of the air inlet pipe 807 is connected to a fluid slip ring 11, the other end of the fluid slip ring 11 is connected to an air tank into which inert gas is introduced, a connection joint is placed into the cylinder 802 through the second opening 806, the positioning seat 805 and the connection joint are sleeved with each other, a bellows is inserted into the cylinder 802 through the second opening 806, the bellows is sleeved with the positioning seat 805, a port of the bellows is in contact with the connection joint, the positioning seat 805 is used for keeping the corrugated pipe concentric with the connection joint, so that the central axes of the corrugated pipe and the connection joint are in a straight line.

Referring to fig. 1-10, the first opening 803 and the welding gun 701 are located on the same side and correspond to each other, and the argon arc welding machine 7, the welding gun 701 and the mercury slip ring 10 are electrically connected.

It should be understood that in the present invention, the pneumatic system 9 includes an air compressor, an air storage tank, an air purification device, and an output pipeline, the air compressor is a power source of the pneumatic system 9, the air storage tank is used for stabilizing and storing air, the air purification device filters impurities in the compressed air, the output pipeline is used for delivering gas, the output end of the output pipeline is connected with the air inlet ports of 602 and 603, the output pipeline is connected with the input end fluid slip ring 11, the output end of the fluid slip ring 11 is connected with the air inlet port of the first cylinder 40202 through the output pipeline, each output pipeline is provided with a control valve for controlling the direction of the compressed air, the electrical system 6 provides a working power supply for the stepping motor 301 and the argon arc welding machine 7, meanwhile, the electrical components appearing in the text are electrically connected with an external master controller and 220V mains supply, and the master controller can be a conventional known device controlled by a computer and the like.

The specific use mode and function of the embodiment are as follows:

when the corrugated pipe clamp is used, a connecting joint is firstly placed into a cylinder 802 through a second opening 806, a positioning seat 805 and the connecting joint are mutually sleeved, a corrugated pipe is inserted into the cylinder 802 through the second opening 806, the corrugated pipe and the positioning seat 805 are mutually sleeved, the port of the corrugated pipe is mutually contacted with the connecting joint, the positioning seat 805 is used for keeping the corrugated pipe and the connecting joint in concentricity, the corrugated pipe and the central axis of the connecting joint are on the same straight line, an air cylinder clamp 503 is started, the corrugated pipe is clamped through the air cylinder clamp 503 so as to be fixed, a second air cylinder 502 is started, the air cylinder clamp 503 is driven by the second air cylinder 502 to move downwards, the air cylinder clamp 503 drives the corrugated pipe to move downwards, and the corrugated pipe has certain elasticity, so that the corrugated pipe exerts pressure on the surface of the connecting joint, and the corrugated pipe is tightly attached to the connecting joint;

the method comprises the steps of introducing inert gas argon into a cylinder 802 through an air inlet pipe 807, protecting a weld bead in a welding process from being oxidized, starting a first cylinder 40202, driving an installation seat 40204 to move by the first cylinder 40202, driving a welding gun 701 to move by the installation seat 40204, inserting the welding gun 701 into the cylinder 802 through a first opening 803, positioning the welding gun 701 to a weld joint of a corrugated pipe through the first cylinder 40202, starting a stepping motor 301, driving a gear 302 to rotate by the stepping motor 301 through an output shaft, driving a rotary panel 304 to rotate by the gear 302 through a rotary support 303, driving the cylinder 802 and the welding gun 701 on the upper surface of the rotary panel 304 to rotate, fixing the corrugated pipe, a connecting joint and a positioning seat 805 relative to equipment, and rotating the welding gun 701 for one circle along the weld joint of the corrugated pipe at the moment to obtain a required circumferential weld, thereby solving the rolling phenomenon of the long-wave corrugated pipe.

The above structure and process are shown in FIGS. 1-10.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims (8)

1. The utility model provides a avoid bellows to beat girth welding machine of rolling up, includes frame (1), its characterized in that, the fixed welding in top of frame (1) has deck plate (2), the last fixed surface of deck plate (2) installs rotation mechanism (3), the top fixed mounting of rotation mechanism (3) has welding chamber (8), the last fixed surface of deck plate (2) installs welder fine-tuning (4), welder fine-tuning (4) include translation device (401), the front of translation device (401) is provided with positioner (402), the last fixed surface of deck plate (2) installs hold-down mechanism (5), the inside of frame (1) is provided with argon arc welding machine (7), the inside of frame (1) is provided with pneumatic system (9), the inside fixed mounting of frame (1) has electrical apparatus system (6), the inside fixed mounting of frame (1) has mercury sliding ring (10), the top of mercury sliding ring (10) is provided with a plurality of fluid sliding rings (11).

2. The girth welding machine for avoiding the coiling of the corrugated pipe as claimed in claim 1, wherein the rotating mechanism (3) comprises a stepping motor (301), an output shaft is fixedly connected to an output end of the stepping motor (301), a gear (302) is fixedly sleeved on the output shaft of the stepping motor (301), a rotating support (303) is meshed with the gear (302), a rotating panel (304) is fixedly connected to an outer ring of the rotating support (303) through a screw, and an inner ring of the rotating support (303) is fixedly connected to the table panel (2) through a screw.

3. The girth welding machine for avoiding corrugated pipe coiling according to claim 2, characterized in that the translation device (401) comprises a translation seat (40101), the translation seat (40101) is fixedly connected with the upper surface of the rotary panel (304), the outer wall of the translation seat (40101) is rotatably connected with a lead screw (40102), the outer wall of the lead screw (40102) is in threaded connection with a movable seat (40103), and the top end of the lead screw (40102) is fixedly connected with a rotating handle (40104).

4. The girth welding machine capable of avoiding corrugated pipe coiling according to claim 3, wherein the positioning device (402) comprises a sliding table (40201), a first air cylinder (40202) is fixedly installed on the outer wall of one side of the sliding table (40201), an installation seat (40204) is fixedly connected to the output end of the first air cylinder (40202), a sliding rail (40203) is fixedly installed on the outer wall of the sliding table (40201), and the sliding rail (40203) is in sliding connection with the installation seat (40204).

5. The circumferential weld welding machine for avoiding corrugated pipe coiling according to claim 4, characterized in that the argon arc welding machine (7) comprises a welding gun (701), the welding gun (701) is fixedly connected with a mounting seat (40204), and the moving seat (40103) is fixedly connected with the outer back wall of the sliding table (40201).

6. The girth welding machine for avoiding corrugated pipe coiling according to claim 1, wherein the pressing mechanism (5) comprises a support frame (501), the support frame (501) is fixedly connected with the upper surface of the table panel (2), a second air cylinder (502) is fixedly installed at the top of the support frame (501), an air cylinder clamp (503) is fixedly connected to the output end of the second air cylinder (502), and the air cylinder clamp (503) is positioned right above the welding chamber (8).

7. The girth welding machine for avoiding the coiling of the corrugated pipe as claimed in claim 2, wherein the welding chamber (8) comprises a base (801), the bottom of the base (801) is fixedly connected with the rotary panel (304) through screws, the base (801) is positioned in the middle of the rotary panel (304), a cylinder (802) is welded on the upper surface of the base (801), a first opening (803) is formed in one side wall of the cylinder (802), an observation window (804) is fixedly installed on the other side of the cylinder (802), a positioning seat (805) is rotatably connected inside the cylinder (802), a second opening (806) is formed in the top of the cylinder (802), an air inlet pipe (807) is fixedly connected to the bottom input end of the cylinder (802), and the other end of the air inlet pipe (807) is connected with the fluid slip ring (11).

8. A girth welding machine avoiding corrugated pipe curling according to claim 5 or 7, characterized in that said cylinder (802) and said welding gun (701) are located on the same side and correspond to each other, said welding gun (701) being electrically connected to said mercury slip ring (10).

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