Automatic welding device for large-diameter metal pipeline

Abstract

The utility model relates to the technical field of pipeline welding, in particular to an automatic welding device for large-diameter metal pipelines, which comprises two large-diameter metal pipelines with butted ends, sliding rails are arranged on the outer surfaces of the two large-diameter metal pipelines, and a movable welding mechanism is arranged on the sliding rails. The movable welding mechanism comprises a sliding mechanism, a locking mechanism and an automatic welding mechanism; the automatic welding mechanism comprises a welding gun movable arm and an electric welding machine, the welding gun movable arm is rotationally connected to the front end of the upper surface of the bearing connecting plate, a welding gun is installed at the front end of the welding gun movable arm, and the electric welding machine is fixed to the rear end of the upper surface of the bearing connecting plate. A welding gun switch, a sliding power motor switch, a lifting motor switch and a hydraulic rod switch are installed on the top of the electric welding machine, and a controller is installed in the electric welding machine. The problems that the working space and conditions are limited, the construction efficiency is low, the welding quality is not stable and potential safety hazards exist due to the fact that operation is mainly conducted through manual welding in an existing external root welding technology are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline welding technical field, concretely is a kind of large-diameter metal pipeline automatic welding device. BACKGROUND

[0002] Long-distance pipeline welding technology is the key technology to ensure pipeline construction quality, improve construction efficiency, control construction cost and guarantee the safety and reliability of pipeline operation. Especially in the connection process of large-diameter metal pipeline, the welding quality directly affects the service life and economic benefit of the whole pipeline system. The traditional large-diameter pipeline welding technology mainly includes two ways of inner welding machine root welding and outer root welding. The inner welding machine welding is widely recognized for its high efficiency and high quality welding effect, but its application is limited by thin welding layer and poor climbing ability. Therefore, in practical application, the outer root welding technology is more commonly used. This welding method not only makes the weld more easily observed, but also provides thicker welding layer and can adapt to various complex terrain conditions, thereby improving the overall construction efficiency.

[0003] However, the existing outer root welding technology still relies on manual welding in actual construction site. The pipeline needs to be elevated during the welding process so that workers can perform circular welding around the pipeline. However, the limited working space and harsh working environment seriously affect the operation of workers, resulting in uneven welding quality, such as uneven weld, incomplete penetration, surface cracks and internal cracks. Especially for large-diameter pipeline operation, in addition, manual welding also has certain safety hazards, which can threaten the health of workers.

[0004] Therefore, it is necessary to invent a large-diameter metal pipeline automatic welding device to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model provides a large-diameter metal pipeline automatic welding device to solve the problem that the existing outer root welding technology mainly relies on manual welding, which leads to limited working space and conditions, low construction efficiency, unstable welding quality and safety hazards.

[0006] The utility model is implemented by adopting the following technical solutions:

[0007] A large-diameter metal pipeline automatic welding device, comprising two large-diameter metal pipelines butt-jointed at the ends, a sliding rail is arranged on the outer surface of the two large-diameter metal pipelines, a movable welding mechanism is arranged on the sliding rail, the movable welding mechanism comprises a sliding mechanism, a locking mechanism and an automatic welding mechanism;

[0008] The sliding mechanism comprises a bearing connecting plate, the upper surface of the bearing connecting plate is fixed with two profiled connecting pieces which are symmetrically distributed left and right, the end of each profiled connecting piece is fixed with an H-shaped connecting piece I, the two ends of each H-shaped connecting piece I are each provided with a power pulley through a wheel shaft I, and the outer end of the wheel shaft I of each power pulley is fixed with a single-groove belt pulley, the upper surface of each profiled connecting piece is fixed with a sliding power motor in the middle, the output shaft of each sliding power motor is fixed with a double-groove belt pulley, and each double-groove belt pulley is connected with the two single-groove belt pulleys on the same H-shaped connecting piece I through a belt drive.

[0009] The locking mechanism comprises an inverted C-shaped connecting plate, the inverted C-shaped connecting plate is connected with the bearing connecting plate through a gear and rack transmission, the outer side of the two ends of the inverted C-shaped connecting plate is each fixed with an H-shaped fixed connecting piece II, the two ends of each H-shaped connecting piece II are each provided with an auxiliary pulley through a wheel shaft II, the two H-shaped connecting pieces II and the two H-shaped connecting pieces I are one-to-one corresponding in position, and the two auxiliary pulleys on each H-shaped connecting piece II are matched with the two power pulleys on the corresponding H-shaped connecting piece I to form a pair of wheel slide combinations.

[0010] The automatic welding mechanism comprises a welding gun movable arm and a welding machine, the welding gun movable arm is rotationally connected to the upper surface of the front end of the bearing connecting plate, the front end of the welding gun movable arm is provided with a welding gun, the welding machine is fixed to the upper surface of the rear end of the bearing connecting plate, the top of the welding machine is provided with a welding gun switch and a sliding power motor switch, the inside of the welding machine is provided with a controller, and the controller is electrically connected with the welding gun, the welding gun switch, the sliding power motor and the sliding power motor switch.

[0011] Further, the sliding rail comprises two oppositely arranged annular rail units, each annular rail unit comprises a guide rail ring and a fixed ring, a plurality of arc-shaped support rods are connected between each guide rail ring and the corresponding fixed ring, two pairs of wheel slide combinations are rollingly assembled on the outer surfaces of the two guide rail rings one by one, and the two fixed rings are one by one correspondingly sleeved on the outer surfaces of the butt joints of the two large-diameter metal pipes.

[0012] Further, each fixed ring comprises two arc-shaped fixed ring plates, the two ends of each arc-shaped fixed ring plate are fixed with a hole ear plate, and the two arc-shaped fixed ring plates of each fixed ring are fixed in a head-to-tail manner through bolts and nuts matched with the hole ear plates; each guide rail ring comprises two arc-shaped rings, the two arc-shaped rings of each guide rail ring are one by one corresponding to the two arc-shaped fixed ring plates in the same annular rail unit, and the two arc-shaped rings of each guide rail ring are head-to-tail connected.

[0013] Further, the guide rail ring is parallel to the fixed ring, and the inner diameter of the guide rail ring is greater than the inner diameter of the fixed ring.

[0014] Further, the upper surface of the inverted C-shaped connecting plate is provided with two rectangular through holes, and each end inner side surface of the inverted C-shaped connecting plate is fixed with an elevating motor, the output shaft of each elevating motor is fixed with a power gear, the lower surface of the bearing connecting plate is fixed with an H-shaped double-side toothed sliding rod, the two upper end of the H-shaped double-side toothed sliding rod are correspondingly inserted into the two rectangular through holes of the inverted C-shaped connecting plate, and the two power gears are correspondingly engaged with the two sides of the H-shaped double-side toothed sliding rod; the top of the electric welding machine is installed with an elevating motor switch, and the controller is electrically connected with the elevating motor and the elevating motor switch.

[0015] Further, the upper surface of the bearing connecting plate is fixed with an L-shaped support arm at the front end, the middle part of the welding gun movable arm is hingedly connected to the upper end of the L-shaped support arm, the welding gun mounting sleeve is fixed to the front end of the welding gun movable arm, the welding gun is mounted in the welding gun mounting sleeve, the rear end of the welding gun movable arm is provided with a hydraulic rod, the rear end of the welding gun movable arm is hingedly connected with the movable end of the hydraulic rod, and the fixed end of the hydraulic rod is hingedly connected with the lower end of the L-shaped support arm; the top of the electric welding machine is installed with a hydraulic rod switch, and the controller is electrically connected with the hydraulic rod and the hydraulic rod switch.

[0016] The utility model discloses compact structure design can operate in the limited space, and through the automation, the problem that the artificial welding is limited by space and complex field environment is solved, and the heavy welding work of manpower is replaced by the automatic design, reduces the physical burden of worker, also avoids the security risk that the worker is exposed to high temperature and harmful gas environment for a long time and thus produces, besides, the controller can control sliding power motor, elevating motor and hydraulic rod accurately, guarantees the stability of the device and the accuracy of welding gun position in the welding process through the accurate control system and stable mechanical structure, and then ensures the consistency and high quality of welding, avoids the quality problem of traditional artificial welding. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole structure schematic diagram of the utility model.

[0018] Figure 2 It is the structure schematic diagram of the sliding rail in the utility model.

[0019] Figure 3 It is the structure schematic diagram of the sliding mechanism in the utility model.

[0020] Figure 4 It is the combined structure schematic diagram of the sliding mechanism and locking mechanism in the utility model.

[0021] Figure 5 It is the structure schematic diagram of the welding gun movable arm in the utility model.

[0022] In the diagram: 1. Large-diameter metal pipe; 2. Load-bearing connecting plate; 3. Special-shaped connector; 4. H-shaped connector I; 5. Power pulley; 6. Single-groove belt drive pulley; 7. Sliding power motor; 8. Double-groove belt drive pulley; 9. Belt; 10. Inverted C-shaped connecting plate; 11. H-shaped fixed connector II; 12. Auxiliary pulley; 13. Welding torch movable arm; 14. Welding machine; 15. Welding torch; 16. Welding torch switch; 17. Sliding power motor switch; 18. Guide rail ring; 19. Fixed ring; 20. Lifting motor; 21. Power gear; 22. H-shaped double-sided toothed sliding rod; 23. Lifting motor switch; 24. L-shaped support arm; 25. Welding torch mounting sleeve; 26. Hydraulic rod; 27. Hydraulic rod switch; 28. Arc-shaped support rod. Detailed Implementation

[0023] An automatic welding device for large-diameter metal pipes, as shown in the attached document. Figure 1 ~Appendix Figure 5 As shown, it includes two large-diameter metal pipes 1 with their ends joined together. The outer surfaces of the two large-diameter metal pipes 1 are provided with sliding rails. A movable welding mechanism is provided on the sliding rails. The movable welding mechanism includes a sliding mechanism, a locking mechanism and an automatic welding mechanism.

[0024] The sliding mechanism includes a bearing connecting plate 2. Two irregularly shaped connecting parts 3 are fixed on the upper surface of the bearing connecting plate 2, which are symmetrically distributed on the left and right. Each irregularly shaped connecting part 3 has an H-shaped connecting part I4 fixed at its end. Each H-shaped connecting part I4 has a power pulley 5 installed at both ends through a wheel axle I. Each power pulley 5 has a single groove belt drive pulley 6 fixed at the outer end of the wheel axle I. A sliding power motor 7 is fixed in the middle of the upper surface of each irregularly shaped connecting part 3. A double groove belt drive pulley 8 is fixed on the output shaft of each sliding power motor 7. Each double groove belt drive pulley 8 is connected to the two single groove belt drive pulleys 6 located on the same H-shaped connecting part I4 through a belt 9.

[0025] The locking mechanism includes an inverted C-shaped connecting plate 10, which is connected to the bearing connecting plate 2 via a gear and rack transmission. An H-shaped fixing connector II 11 is fixed on each of the outer sides of the two ends of the inverted C-shaped connecting plate 10. Each of the two ends of each H-shaped connector II 11 is equipped with an auxiliary pulley 12 via a wheel axle II. The positions of the two H-shaped connectors II 11 correspond one-to-one with the two H-shaped connectors I 4. The two auxiliary pulleys 12 on each H-shaped connector II 11 cooperate with the two power pulleys 5 on the corresponding H-shaped connector I 4 to form a pair of pulley combinations.

[0026] The automatic welding mechanism comprises a welding gun movable arm 13 and an electric welding machine 14, the welding gun movable arm 13 is rotationally connected to the front end of the upper surface of the bearing connecting plate 2, a welding gun 15 is installed at the front end of the welding gun movable arm 13, the electric welding machine 14 is fixed to the rear end of the upper surface of the bearing connecting plate 2, a welding gun switch 16 and a sliding power motor switch 17 are installed at the top of the electric welding machine 14, a controller is installed in the electric welding machine 14, and the controller is electrically connected with the welding gun 15, the welding gun switch 16, the sliding power motor 7 and the sliding power motor switch 17 respectively.

[0027] The utility model discloses compact structure design can operate in the limited space, and through the automation has solved the problem of being limited by space and complex field environment when manual welding, and the design of automation has replaced the heavy welding work of manpower, has alleviated the physical burden of worker, also avoided the security risk produced when worker exposes in high temperature and harmful gas environment for a long time, the sliding rail provides a solid and flexible base for the movable welding mechanism, ensures that the movable welding mechanism can move smoothly on the outer surface of the large diameter metal pipeline 1, the bearing connecting plate 2 is used to install the sliding mechanism, locking mechanism and automatic welding mechanism, and is the core support of the whole movable welding mechanism, the structure design of the sliding mechanism that bearing connecting plate 2, special-shaped connecting piece 3, H-shaped connecting piece I 4, power pulley 5, wheel shaft I, single groove belt pulley 6, sliding power motor 7, double groove belt pulley 8 and belt 9 constitute, drive belt transmission system through sliding power motor 7, drive power pulley 5 rotation, thereby realize the smooth movement of sliding mechanism along the sliding rail, the locking mechanism is connected with the sliding mechanism through gear and rack transmission, can adjust the tightness of sliding rail, ensure that the movable welding mechanism can be stably assembled on the sliding rail, and ensure the stability and safety in the welding process, the welding gun movable arm 13, electric welding machine 14, welding gun 15 and controller are the core part of automatic welding mechanism, are responsible for actual welding operation, realize the automation of welding process, greatly reduce the time of manual operation, not only improve the work efficiency, and ensure the consistency and high quality of welding, avoid the quality problem of traditional manual welding.

[0028] The sliding rail comprises two oppositely arranged annular track units, each annular track unit comprises a guide rail ring 18 and a fixed ring 19, a plurality of arc-shaped support rods 28 are connected between each guide rail ring 18 and the corresponding fixed ring 19, two pairs of wheel slide groups are correspondingly and rollingly assembled on the outer surfaces of the two guide rail rings 18, and the two fixed rings 19 are correspondingly sleeved on the outer surfaces of the butt joints of the two large-diameter metal pipelines 1.

[0029] The guide rail ring 18 is used for guiding the movement of the power pulley 5 and the auxiliary pulley 12, the fixed ring 19 is used for fixing the sliding rail, and the arc-shaped support rod 28 is used for supporting the guide rail ring 18 and ensuring the overall stability of the sliding rail.

[0030] Each fixed ring 19 comprises two arc-shaped fixed ring plates, and each arc-shaped fixed ring plate is fixed with a hole ear plate at both ends. The two arc-shaped fixed ring plates of each fixed ring 19 are fixed by means of bolts and nuts penetrating through the hole ear plates. Each guide rail ring 18 comprises two arc-shaped rings, and the two arc-shaped rings of each guide rail ring 18 correspond to the two arc-shaped fixed ring plates of the same ring-shaped rail unit, and the two arc-shaped rings of each guide rail ring 18 are butted at the ends.

[0031] The guide rail ring 18 is parallel to the fixed ring 19, and the inner diameter of the guide rail ring 18 is greater than the inner diameter of the fixed ring 19.

[0032] The structure design of the fixed ring 19 and the guide rail ring 18 is convenient for installation and disassembly.

[0033] The upper surface of the inverted C-shaped connecting plate 10 is provided with two rectangular through holes, and the inner side of the two ends of the inverted C-shaped connecting plate 10 is fixed with a lifting motor 20. The output shaft of each lifting motor 20 is fixed with a power gear 21. The lower surface of the bearing connecting plate 2 is fixed with an H-shaped double-sided toothed sliding rod 22. The two upper ends of the H-shaped double-sided toothed sliding rod 22 are correspondingly inserted into the two rectangular through holes of the inverted C-shaped connecting plate 10, and the two power gears 21 are correspondingly meshed on both sides of the H-shaped double-sided toothed sliding rod 22. The top of the electric welding machine 14 is provided with a lifting motor switch 23, and the controller is electrically connected with the lifting motor 20 and the lifting motor switch 23.

[0034] The lifting motor 20, the power gear 21 and the H-shaped double-sided toothed sliding rod 22 constitute a gear rack transmission structure, which can adjust the distance between the locking mechanism and the sliding mechanism, so as to ensure that the two pairs of roller skate combinations can be safely and stably assembled on the outer surfaces of the two guide rail rings 18.

[0035] The upper surface of the bearing connecting plate 2 is fixed with an L-shaped support arm 24 at the front end. The middle part of the welding gun movable arm 13 is hinged to the upper end of the L-shaped support arm 24. The front end of the welding gun movable arm 13 is fixed with a welding gun mounting sleeve 25. The welding gun 15 is mounted in the welding gun mounting sleeve 25. The rear end of the welding gun movable arm 13 is provided with a hydraulic rod 26, and the rear end of the welding gun movable arm 13 is hinged to the movable end of the hydraulic rod 26. The fixed end of the hydraulic rod 26 is hinged to the lower end of the L-shaped support arm 24. The top of the electric welding machine 14 is provided with a hydraulic rod switch 27, and the controller is electrically connected with the hydraulic rod 26 and the hydraulic rod switch 27.

[0036] The L-shaped supporting arm 24 cooperates with the hydraulic rod 26 to adjust the angle and position of the welding gun movable arm 13, so that the welding gun 15 can accurately aim at the welding seam for welding and adapt to different welding requirements.

[0037] The utility model discloses in using is realized with following steps:

[0038] Step one: the two big diameter metal pipeline 1 of to be welded are carried out pipeline bevel rust removal, and after acceptance, are carried out group pair through the pipe hoist, and after group pair is completed, the center line straightness of pipeline after acceptance inspection group pair is checked, and after two opposite setting annular track units are set on the outer surface of the butt joint of two big diameter metal pipeline 1 to be welded, ensure that the two arc rings of each guide rail ring 18 are butt-jointed.

[0039] Step two: the movable welding mechanism is installed on the sliding rail formed by two annular track units, the spacing of two guide rail rings 18 is adjusted, each guide rail ring 18 is located between a corresponding pair of wheel slide combinations, and then the two arc-shaped fixed ring plates of each fixed ring 19 are butt-jointed and fixed through the bolts with hole ear plates and nuts.

[0040] Step three: the lifting motor switch 23 is controlled to start the lifting motor 20, so that the lifting motor 20 drives the power gear 21 to rotate, since the power gear 21 is engaged with the H-shaped double-sided toothed sliding rod 22, the power gear 21 rotates to drive the inverted C-shaped connecting plate 10 to move towards the bearing connecting plate 2, so that each pair of wheel slide combinations is stably rolled and assembled on the outer surface of the corresponding guide rail ring 18 and locks the guide rail ring 18, to ensure stable installation and prevent falling, and then the lifting motor switch 23 is controlled to stop the lifting motor 20.

[0041] Step four: the hydraulic rod switch 27 is controlled to start the hydraulic rod 26 and extend, so that the hydraulic rod 26 drives the welding gun movable arm 13 to rotate to an appropriate angle, that is, the front end of the welding gun 15 is aligned with the welding seam to be welded and is moderately spaced from the welding seam, and then the hydraulic rod switch 27 is controlled to stop the hydraulic rod 26.

[0042] Step five: the sliding power motor switch 17 is controlled to start the sliding power motor 7, so that the sliding power motor 7 drives the double-groove belt pulley 8 to rotate, the double-groove belt pulley 8 rotates while driving the single-groove belt pulley 6 to rotate in the same direction through the belt 9, and then drives the power pulley 5 to rotate, at this time, the power pulley 5 rotates and drives the auxiliary pulley 12 to move along the guide rail ring 18.

[0043] Step six: after observing the movable welding mechanism normally circumferentially moving around the large-diameter metal pipeline 1 on the sliding rail, the welding gun 15 is started by the welding gun switch 16 to align the welding gun 15 with the weld for welding operation, when the welding reaches the predetermined length, the welding gun 15 is stopped by the welding gun switch 16, and the sliding power motor 7 is stopped by the sliding power motor switch 17, the movable welding mechanism and the sliding rail are removed, and the welding part is cleaned and inspected, thereby completing the use of the device, overcoming the problems of the existing outer root welding technology, which is mainly manually welded, resulting in limited working space and conditions, low construction efficiency, unstable welding quality, and safety hazards.

[0044] In the implementation process, when the pipe diameter of the large-diameter metal pipeline 1 is greater than 300 mm, the inner aligning device is used to assemble the pipe opening; when the pipe diameter of the large-diameter metal pipeline 1 is less than or equal to 300 mm, the outer aligning device is used for assembly.

[0045] In the description of the present application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0046] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for automatic welding of large diameter metal pipes, comprising two large diameter metal pipes (1) butted at the ends, characterized in that: The outer surface of the two large-diameter metal pipes (1) is provided with a sliding track, and the sliding track is provided with a movable welding mechanism, which comprises a sliding mechanism, a locking mechanism and an automatic welding mechanism; The sliding mechanism comprises a bearing connecting plate (2), the upper surface of the bearing connecting plate (2) is fixed with two profiled connecting pieces (3) which are symmetrically distributed left and right, the end of each profiled connecting piece (3) is fixed with an H-shaped connecting piece I (4), the two ends of each H-shaped connecting piece I (4) are each provided with a power pulley (5) through a wheel shaft I, and the outer end of the wheel shaft I of each power pulley (5) is fixed with a single-groove belt pulley (6), the upper surface of each profiled connecting piece (3) is fixed with a sliding power motor (7) in the middle, the output shaft of each sliding power motor (7) is fixed with a double-groove belt pulley (8), and each double-groove belt pulley (8) is in transmission connection with two single-groove belt pulleys (6) on the same H-shaped connecting piece I (4) through a belt (9); The locking mechanism comprises an inverted C-shaped connecting plate (10), the bearing connecting plate (2) and the inverted C-shaped connecting plate (10) are in transmission connection through a gear and rack, the outer side of the two ends of the inverted C-shaped connecting plate (10) is each fixed with an H-shaped fixed connecting piece II (11), the two ends of each H-shaped connecting piece II (11) are each provided with an auxiliary pulley (12) through a wheel shaft II, the two H-shaped connecting pieces II (11) and the two H-shaped connecting pieces I (4) are in one-to-one correspondence in position, and the two auxiliary pulleys (12) on each H-shaped connecting piece II (11) form a pair of wheel sliding combination in cooperation with the two power pulleys (5) on the corresponding H-shaped connecting piece I (4); The automatic welding mechanism comprises a welding gun movable arm (13) and an electric welding machine (14), the welding gun movable arm (13) is rotationally connected to the upper surface of the front end of the bearing connecting plate (2), a welding gun (15) is installed at the front end of the welding gun movable arm (13), the electric welding machine (14) is fixed to the upper surface of the rear end of the bearing connecting plate (2), a welding gun switch (16) and a sliding power motor switch (17) are installed on the top of the electric welding machine (14), a controller is installed in the electric welding machine (14), and the controller is in electrical connection with the welding gun (15), the welding gun switch (16), the sliding power motor (7) and the sliding power motor switch (17).

2. The apparatus according to claim 1, wherein: The sliding track comprises two oppositely arranged annular track units, each annular track unit comprises a guide rail ring (18) and a fixed ring (19), a plurality of arc-shaped supporting rods (28) are connected between each guide rail ring (18) and the corresponding fixed ring (19), two pairs of wheel sliding combinations are rollingly assembled on the outer surfaces of the two guide rail rings (18), and the two fixed rings (19) are one-to-one correspondingly sleeved on the outer surfaces of the butt joints of the two large-diameter metal pipes (1).

3. A device for automatic welding of large diameter metal pipes according to claim 2, characterized in that: Each fixed ring (19) comprises two arc-shaped fixed ring plates, both ends of each arc-shaped fixed ring plate are fixed with a hole ear plate, two arc-shaped fixed ring plates of each fixed ring (19) are fixed by bolts and nuts through the hole ear plates.

4. The apparatus of claim 2, wherein: The guide rail ring (18) is parallel to the fixed ring (19), and the inner diameter of the guide rail ring (18) is greater than the inner diameter of the fixed ring (19).

5. The apparatus of claim 1, wherein: The upper surface of the inverted C-shaped connecting plate (10) is provided with two rectangular through holes, and the inner side of the two ends of the inverted C-shaped connecting plate (10) is fixed with a lifting motor (20), the output shaft of each lifting motor (20) is fixed with a power gear (21), the lower surface of the bearing connecting plate (2) is fixed with an H-shaped double-sided toothed sliding rod (22), the two upper ends of the H-shaped double-sided toothed sliding rod (22) are correspondingly inserted into the two rectangular through holes of the inverted C-shaped connecting plate (10), and the two power gears (21) are correspondingly meshed on both sides of the H-shaped double-sided toothed sliding rod (22); the top of the electric welding machine (14) is provided with a lifting motor switch (23), and the controller is electrically connected with the lifting motor (20) and the lifting motor switch (23).

6. The apparatus of claim 1, wherein: The upper surface of the bearing connecting plate (2) is fixed with an L-shaped support arm (24) at the front end, the middle part of the welding gun movable arm (13) is hinged to the upper end of the L-shaped support arm (24), the front end of the welding gun movable arm (13) is fixed with a welding gun mounting sleeve (25), the welding gun (15) is mounted in the welding gun mounting sleeve (25), the rear end of the welding gun movable arm (13) is provided with a hydraulic rod (26), and the rear end of the welding gun movable arm (13) is hinged to the movable end of the hydraulic rod (26), the fixed end of the hydraulic rod (26) is hinged to the lower end of the L-shaped support arm (24); the top of the electric welding machine (14) is provided with a hydraulic rod switch (27), and the controller is electrically connected with the hydraulic rod (26) and the hydraulic rod switch (27).

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