Welding device for inner platform of large diameter steel pipe pile

Abstract

The present invention relates to the technical field of pipe pile welding, and specifically to a welding device for an inner platform of a large-diameter steel pipe pile, comprising a base plate and two connecting seats, wherein the upper ends of the two base plates are movably connected with arc-shaped clamping plates, and the upper ends of the base plates are fixedly connected with arc-shaped support blocks, and the outer sides of the two connecting seats are movably connected with positioning mechanisms, and the extension lengths of several adjustment mechanisms are adjusted according to the size of the tubular inner diameter; the inner platform is clamped and fixed by the two connecting seats, and the extension strength of the four positioning mechanisms is adjusted so that the connecting seat can carry the inner platform to move in the center of the pipe pile, and the pipe pile is placed on the upper end of the base plate and clamped by two groups of arc-shaped clamping plates, and connected with a traction mechanism so that the traction mechanism pulls the inner platform to a suitable welding position, and then the inner platform is welded in the pipe pile through the cooperation of the welding robot arm and the inner gear ring, which is convenient and efficient to use.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe pile welding, in particular to a welding device for an inner platform of a large-diameter steel pipe pile. Background Art

[0002] For example, the Chinese patent with the announcement number CN220767733U discloses an above-water welding operation platform on a steel pipe pile, including a suspension beam, at least two arc-shaped operation platforms are suspended below the suspension beam, the arc-shaped operation platforms are against the pipe pile, and the multiple arc-shaped operation platforms are locked and fixed to each other. An arc-shaped connecting plate is fixed on the inner side of the arc-shaped operation platform, and the arc-shaped connecting plates in the multiple arc-shaped operation platforms are fixedly connected by bolts. A rubber layer is provided on the inner side of the arc-shaped connecting plate, and the arc-shaped connecting plate is against the pipe pile.

[0003] However, the above scheme has the following shortcomings: in the above patent, multiple arc-shaped operating platforms are spliced ​​against each other and fixed on the steel pipe pile, which is convenient for operators to perform welding construction on the outside of the steel pipe pile. However, for the internal welding of the steel pipe pile, this operating platform cannot be built inside the steel pipe pile. At the same time, since the space inside the steel pipe pile is small and closed, it is not convenient for operators to perform welding operations inside the steel pipe pile, and it will also cause certain harm to the health of the operators. For this reason, we have introduced a welding device for the internal platform of large-diameter steel pipe piles. Summary of the invention

[0004] The object of the present invention is to provide a welding device for an inner platform of a large-diameter steel pipe pile to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A welding device for an inner platform of a large-diameter steel pipe pile comprises two bottom plates and two connecting seats, the upper ends of the two bottom plates are movably connected with arc-shaped clamping plates, the upper ends of the two bottom plates are fixedly connected with arc-shaped support blocks, the outer sides of the two connecting seats are movably connected with positioning mechanisms, and the extension lengths of several adjusting mechanisms are adjusted according to the size of the tubular inner diameter, so that the connecting seats are supported by the positioning mechanisms and move in the air along the inner center of the pipe pile, the outer sides of the connecting seats are movably connected with an inner gear ring, the outer sides of the inner gear ring are fixedly connected with a welding mechanical arm, and the opposite ends of the two connecting seats are fixedly connected with connecting rings;

[0007] The connecting ring is connected to the traction mechanism, and after the inner platform is clamped by the two connecting seats, the two connecting seats drive the inner platform to move along the inner side of the pipe pile to the welding position under the pulling of the traction mechanism, and the welding robot arm is driven by the inner gear ring to weld the inner platform to the inner side of the pipe pile. One end of the arc-shaped clamping plate on the left is fixedly connected to the first positioning plate, and one end of the arc-shaped clamping plate on the right is fixedly connected to the second positioning plate. A T-shaped positioning block is movably connected to the lower end of the first positioning plate, and a plurality of slots are opened in the upper end of the second positioning plate. The opposite ends of the two connecting seats are fixedly connected to positioning blocks, and a plurality of fixing screws are provided on the outer side of the connecting seat.

[0008] Preferably, the lower end of the arc-shaped clamp plate is slidably connected to a T-slot, the T-slot is opened in the upper end of the base plate, a positive and negative threaded screw is movably connected in the T-slot, the lower side of the arc-shaped clamp plate is screwed to the outer side of the positive and negative threaded screw, one end of the positive and negative threaded screw extends into the external environment and is fixedly connected to the output end of the first motor, and the first motor is fixedly connected to the base plate.

[0009] Preferably, the positioning mechanism includes a T-shaped support rod, the lower side of the T-shaped support rod is slidably connected in a sliding cavity, the sliding cavity is opened in a connecting seat, the T-shaped support rod is movably connected to a guide wheel at one end away from the connecting seat, a first spring is fixedly connected in the sliding cavity, and the other end of the first spring is fixedly connected to the T-shaped support rod.

[0010] Preferably, a connecting screw is threaded in one end of the T-shaped support rod, one end of the connecting screw passes through a slide groove and extends into the external environment, the slide groove is opened on the outer side of the connecting seat, the slide groove is communicated with the sliding cavity, the other end of the connecting screw extends into the square cavity and is movably connected to the square block, the square cavity is opened in the T-shaped support rod, the square block is slidably connected to the square cavity, the square block is fixedly connected to one end away from the connecting screw with two limiting teeth, the limiting teeth are meshed with gears, the gear is movably connected to the T-shaped support rod, the gear is meshed in the tooth groove at one end away from the T-shaped support rod, and the tooth groove is opened in the sliding cavity.

[0011] Preferably, the inner gear ring is slidably connected to the outer side of the connecting seat, the inner side of the inner gear ring is meshed with the connecting gear, the connecting gear is movably connected in the connecting seat, a servo motor is fixedly installed in the connecting seat, and the output end of the servo motor is fixedly connected to the connecting gear.

[0012] Preferably, the traction mechanism includes a traction rope, one end of the traction rope is movably connected to the connecting ring, one end of the traction rope away from the connecting seat is fixedly connected to the outside of the take-up wheel, the take-up wheel is movably connected to the bracket, the bracket is fixedly connected to the connecting plate, the connecting plate is fixedly connected to the upper end of the bottom plate, one end of the bracket is fixedly connected to the second motor, and the output end of the second motor is fixedly connected to the take-up wheel.

[0013] Preferably, the upper side of the T-shaped positioning block is slidably connected to the positioning cavity, the positioning cavity is opened in the lower end of the first positioning plate, a positioning spring is fixedly connected in the positioning cavity, the other end of the positioning spring is fixedly connected to the T-shaped positioning block, an electromagnet is provided on the upper side of the T-shaped positioning block, and the electromagnet is fixedly connected to the upper end of the positioning cavity.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the inner platform is clamped and fixed by two connecting seats, and the connecting seat can carry the inner platform to move in the center of the pipe pile by adjusting the extension strength of the four positioning mechanisms; the pipe pile is placed on the upper end of the base plate and clamped by two sets of arc-shaped clamping plates, the connecting seat clamping the inner platform is sent to the inside of the pipe pile, and after the traction mechanism pulls the inner platform to a suitable welding position through connection with the traction mechanism, the inner platform is welded in the pipe pile through the cooperation of the welding robot arm and the inner gear ring, which is convenient and efficient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the connecting seat of the present invention;

[0017] Figure 3 It is a cross-sectional structural schematic diagram of the connection relationship between the limit tooth and the gear of the present invention;

[0018] Figure 4 This is a cross-sectional structural schematic diagram of the connection relationship between the T-shaped positioning block and the positioning cavity of the present invention;

[0019] Figure 5 It is a cross-sectional structural schematic diagram of the connection relationship between the arc-shaped clamping plate and the bottom plate of the present invention;

[0020] Figure 6 It is a schematic diagram of the cross-sectional structure of the present invention in working state.

[0021] In the figure: 1, bottom plate; 2, connecting plate; 3, second motor; 4, take-up wheel; 5, positive and negative thread screw; 6, second positioning plate; 7, guide wheel; 8, welding robot arm; 9, inner platform; 10, T-shaped support rod; 11, slide groove; 12, first positioning plate; 13, traction rope; 14, arc clamping plate; 15, connecting seat; 16, inner gear ring; 17, connecting ring; 18, slot; 19, arc support block; 20, T shaped groove; 21, the first motor; 22, the pipe pile; 23, the positioning block; 24, the connecting gear; 25, the square cavity; 26, the fixing screw; 27, the gear; 28, the servo motor; 29, the sliding cavity; 30, the first spring; 31, the connecting screw; 32, the tooth groove; 33, the limiting tooth; 34, the square block; 35, the positioning cavity; 36, the positioning spring; 37, the T-shaped positioning block; 38, the electromagnet; 39, the bracket. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-6 , the present invention provides a technical solution: Embodiment 1:

[0024] like Figure 1 As shown, a welding device for the inner platform of a large-diameter steel pipe pile comprises two bottom plates 1 and two connecting seats 15. The upper ends of the two bottom plates 1 are movably connected with arc-shaped clamping plates 14. The clamping surfaces of the arc-shaped clamping plates 14 are provided with cushions. The surfaces of the two groups of pipe piles 22 are clamped by the arrangement of the cushions. The upper ends of the bottom plates 1 are fixedly connected with arc-shaped support blocks 19. The pipe piles 22 are positioned and supported by the arc-shaped support blocks 19. The outer sides of the two connecting seats 15 are movably connected with positioning mechanisms. The positioning mechanisms are adjusted according to the size of the inner diameter of the pipe. The extension length of several adjustment mechanisms is adjusted so that the connection seat 15 can be suspended and moved along the inner center of the pipe pile under the support of the positioning mechanism. The outer side of the connection seat 15 is movably connected with an inner gear ring 16, and the outer side of the inner gear ring 16 is fixedly connected with a welding robot arm 8. In actual use, the welding robot arm 8 should be a robot arm with more than three axes to ensure that the welding robot arm 8 can more flexibly weld and fix the connection between the pipe pile 22 and the inner platform 9. The opposite ends of the two connection seats 15 are fixedly connected with connection rings 17.

[0025] The connecting ring 17 is connected to the traction mechanism. After the inner platform is clamped by the two connecting seats 15, the two connecting seats 15 drive the inner platform to move along the inner side of the pipe pile to the welding position under the pulling of the traction mechanism. The welding robot arm 8 is driven to rotate by the inner gear ring 16 to weld the inner platform to the inner side of the pipe pile. One end of the left arc clamping plate 14 is fixedly connected to the first positioning plate 12, and one end of the right arc clamping plate 14 is fixedly connected to the second positioning plate 6. A T-shaped positioning block 37 is movably connected to the lower end of the first positioning plate 12, and a plurality of slots 18 are provided in the upper end of the second positioning plate 6. When the two arc-shaped clamping plates 14 move inward to clamp the pipe pile 22, after the two groups of arc-shaped clamping plates 14 clamp the pipe pile 22, the T-shaped positioning block 37 arranged at the lower end of the first positioning plate 12 will be clamped into the corresponding clamping groove 18, and the opposite ends of the two connecting seats 15 are fixedly connected with the positioning blocks 23, and the outer side of the connecting seat 15 is provided with a plurality of fixing screws 26. In the process of manufacturing the inner platform 9, a positioning hole is set at the axial position of the inner platform 9 for clamping the positioning block 23, and a plurality of internal threaded holes are set at both ends of the inner platform for screwing the fixing screws 26. Embodiment 2:

[0026] On the basis of Example 1, in order to enable the connecting seat 15 to drive the inner platform 9 to move along the center of the inner side of the pipe pile 22, it is ensured that the connecting seat 15 does not contact the inner side of the pipe pile 22. Figure 5 As shown, the lower end of the arc clamping plate 14 is slidably connected to the T-slot 20, and the T-slot 20 is opened in the upper end of the base plate 1. The positive and negative threaded screw 5 is movably connected in the T-slot 20. The lower side of the arc clamping plate 14 is screwed to the outer side of the positive and negative threaded screw 5. One end of the positive and negative threaded screw 5 extends into the external environment and is fixedly connected to the output end of the first motor 21. The first motor 21 is fixedly connected to the base plate 1, and the two first motors 21 are turned on respectively. After the first motor 21 is started, it drives the positive and negative threaded screw 5 connected to its output end to start rotating. Since the outer side of the positive and negative threaded screw 5 is provided with two mirror-image external thread grooves, and the two external thread grooves are respectively connected to the corresponding arc clamping plates 14, during the rotation of the positive and negative threaded screw 5, the two arc clamping plates 14 will synchronously move inward to clamp the pipe pile 22.

[0027] like Figure 2As shown, the positioning mechanism includes a T-shaped support rod 10, the lower side of the T-shaped support rod 10 is slidably connected to the sliding cavity 29, the sliding cavity 29 is opened in the connecting seat 15, and the end of the T-shaped support rod 10 away from the connecting seat 15 is movably connected to the guide wheel 7, and the guide wheel 7 can move along the inner side of the pipe pile 22 when the connecting seat 15 is pulled and moved, and the first spring 30 is fixedly connected in the sliding cavity 29, and the other end of the first spring 30 is fixedly connected to the T-shaped support rod 10. When the T-shaped support rod 10 is pressed, the first spring 30 will be compressed. When the pressing on the T-shaped support rod 10 is cancelled, the T-shaped support rod 10 returns to its original position under the elastic force of the first spring 30;

[0028] like Figure 2 As shown, a connecting screw 31 is threadedly connected to one end of the T-shaped support rod 10, and one end of the connecting screw 31 passes through the slide groove 11 and extends into the external environment. The slide groove 11 is arranged inside the outer side of the connecting seat 15, and the slide groove 11 is communicated with the sliding cavity 29. The other end of the connecting screw 31 extends into the square cavity 25 and is movably connected with the square block 34. The square cavity 25 is arranged in the T-shaped support rod 10, and the square block 34 is slidably connected in the square cavity 25. The square block 34 is fixedly connected to one end away from the connecting screw 31 with two limiting teeth 33. The limiting teeth 33 are meshed with the gear 27. The gear 27 is movably connected to the T-shaped support rod 10, and the gear 27 is meshed with the tooth groove 32 at one end away from the T-shaped support rod 10. The tooth groove 32 is provided in the sliding cavity 29, and the connecting screw 31 is rotated outward to drive the square block 34 connected thereto to move. When the square block 34 moves, the limiting tooth 33 cancels the meshing state with the gear 27. At this time, the T-shaped support rod 10 is in a movable state, and the extended part of the connecting screw 31 is pushed downward to drive the T-shaped support rod 10 to move downward. When the T-shaped support rod 10 moves, the gear 27 will move along the tooth groove 32. When the T-shaped support rod 10 moves to a suitable position, the connecting screw 31 is rotated inward to drive the square block 34 to move inward again, so that the limiting tooth 33 meshes with the gear 27 again, so that the T-shaped support rod 10 is limited.

[0029] like Figure 2As shown, the inner gear ring 16 is slidably connected to the outer side of the connecting seat 15, and the inner side of the inner gear ring 16 is meshed with the connecting gear 24, and the connecting gear 24 is movably connected to the connecting seat 15. A servo motor 28 is fixedly installed in the connecting seat 15, and the output end of the servo motor 28 is fixedly connected to the connecting gear 24. The servo motor 28 can be used in a corresponding size and model in actual use. By writing a corresponding program, the welding robot arm 8 and the servo motor 28 are controlled to perform corresponding work. The traction mechanism includes a traction rope 13, and the traction rope 13 One end is movably connected to the connecting ring 17, one end of the traction rope 13 away from the connecting seat 15 is fixedly connected to the outside of the take-up wheel 4, the take-up wheel 4 is movably connected to the bracket 39, the bracket 39 is fixedly connected to the connecting plate 2, the connecting plate 2 is fixedly connected to the upper end of the bottom plate 1, one end of the bracket 39 is fixedly connected to the second motor 3, the output end of the second motor 3 is fixedly connected to the take-up wheel 4, the second motor 3 is started to drive the take-up wheel 4 connected to its output end to rotate, and the traction rope 13 is pulled by the rotation of the take-up wheel 4, so that the connecting seat 15 drives the inner platform 9 to move to the welding area;

[0030] The upper side of the T-shaped positioning block 37 is slidably connected to the positioning cavity 35, and the positioning cavity 35 is opened in the lower end of the first positioning plate 12. A positioning spring 36 is fixedly connected in the positioning cavity 35, and the other end of the positioning spring 36 is fixedly connected to the T-shaped positioning block 37. An electromagnet 38 is provided on the upper side of the T-shaped positioning block 37, and the electromagnet 38 is fixedly connected to the upper end of the positioning cavity 35. The electromagnet 38 is turned on to adsorb the T-shaped positioning block 37, so that the T-shaped positioning block 37 is separated from the slot 18. After the two sets of arc clamps 14 are opened by turning on the first motor 21, the welded pipe pile 22 can be hoisted down.

[0031] Working principle: when in use, after hoisting the two connecting seats 15, the inner platform 9 is hoisted between the two connecting seats 15, and the connecting seat 15 and the inner platform 9 are connected together through a plurality of fixing screws 26. According to the inner diameter of the pipe pile 22, the extension lengths of the plurality of T-shaped support rods 10 are adjusted respectively. Specifically, the connecting screw 31 is rotated outward to drive the square block 34 connected thereto to move. When the square block 34 moves, the limit teeth 33 cancel the meshing state with the gear 27. At this time, the T-shaped support rod 10 is in an active state, and is pushed downward. The extended part of the connecting screw 31 can drive the T-shaped support rod 10 to move downward. When the T-shaped support rod 10 moves, the gear 27 will move along the tooth groove 32. When the T-shaped support rod 10 moves to a suitable position, the connecting screw 31 is rotated inward to drive the square block 34 to move inward again, so that the limiting teeth 33 are meshed with the gear 27 again, so that the T-shaped support rod 10 is limited. When the extended lengths of several T-shaped support rods 10 are adjusted, the two connecting seats 15 holding the inner platform 9 are sent into the pipe pile 22;

[0032] Hoist the pipe pile 22 to the upper end of the arc-shaped support block 19 at the upper end of the two bottom plates 1. After the hoisting is completed, turn on the two first motors 21 respectively. After the first motor 21 is started, it drives the positive and negative threaded screw 5 connected to its output end to start rotating. Since the outer side of the positive and negative threaded screw 5 is provided with two mirror-image external thread grooves, and the two external thread grooves are respectively connected to the corresponding arc-shaped clamping plates 14, during the rotation of the positive and negative threaded screw 5, the two arc-shaped clamping plates 14 will synchronously move inward to clamp the pipe pile 22. After the two groups of arc-shaped clamping plates 14 clamp the pipe pile 22, the T-shaped positioning block 37 provided at the lower end of the first positioning plate 12 will be clamped into the corresponding clamping groove 18, and the first motor 21 is turned off at this time;

[0033] The traction ropes 13 arranged on the outsides of the two take-up wheels 4 are tied together with the corresponding connecting rings 17 respectively. After the connection is completed, the second motor 3 on the moving side is started to drive the take-up wheel 4 connected to its output end to rotate, and the traction rope 13 is pulled by the rotation of the take-up wheel 4, so that the connecting seat 15 drives the inner platform 9 to move to the welding area. After moving to the welding area, the second motor 3 is turned off, so that the take-up wheel 4 cancels the winding of the traction rope 13. At this time, the pipe pile 22 and the inner platform 9 can be welded by the welding robot arm 8, and the connecting gear 24 is driven to rotate by the servo motor 28, and the connecting gear 24 rotates the inner gear ring 16 to rotate, and the rotation of the inner gear ring 16 drives the welding robot arm 8 to move, so as to realize the complete welding of the pipe pile 22 and the connecting seat 15;

[0034] After welding is completed, several fixing screws 26 are unscrewed to disengage the connection between the connecting seat 15 and the inner platform 9. The two second motors 3 are turned on to drive the take-up wheel 4 to reel in the traction rope 13, and the connecting seat 15 is pulled out of the pipe pile 22. The electromagnet 38 is turned on to adsorb the T-shaped positioning block 37, so that the T-shaped positioning block 37 is disengaged from the slot 18. After the two sets of arc-shaped clamping plates 14 are opened by turning on the first motor 21, the welded pipe pile 22 can be hoisted down.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for a large diameter steel pipe pile inner platform, comprising two bottom plates and two connecting seats, characterized in that: The upper ends of the two bottom plates are movably connected with arc-shaped clamping plates, the upper ends of the bottom plates are fixedly connected with arc-shaped support blocks, the outer sides of the two connecting seats are movably connected with positioning mechanisms, and the extension lengths of several adjusting mechanisms are adjusted according to the size of the tubular inner diameter, so that the connecting seat is supported by the positioning mechanism and moves in the air along the inner center of the pipe pile, the outer side of the connecting seat is movably connected with an inner gear ring, the outer side of the inner gear ring is fixedly connected with a welding mechanical arm, and the opposite ends of the two connecting seats are fixedly connected with connecting rings; The connecting ring is connected to the traction mechanism, and after the inner platform is clamped by the two connecting seats, the two connecting seats drive the inner platform to move along the inner side of the pipe pile to the welding position under the pulling of the traction mechanism, and the welding mechanical arm is driven to rotate by the inner gear ring to weld the inner platform to the inner side of the pipe pile. One end of the arc-shaped clamping plate on the left is fixedly connected to the first positioning plate, and one end of the arc-shaped clamping plate on the right is fixedly connected to the second positioning plate. A T-shaped positioning block is movably connected to the lower end of the first positioning plate, and a plurality of slots are provided in the upper end of the second positioning plate. The opposite ends of the two connecting seats are fixedly connected to the positioning blocks, and a plurality of fixing screws are provided on the outer side of the connecting seat; The positioning mechanism comprises a T-shaped support rod, the lower side of the T-shaped support rod is slidably connected in a sliding cavity, the sliding cavity is opened in the connecting seat, the end of the T-shaped support rod away from the connecting seat is movably connected to a guide wheel, the sliding cavity is fixedly connected to a first spring, and the other end of the first spring is fixedly connected to the T-shaped support rod; A connecting screw is threadedly connected to one end of the T-shaped support rod, one end of the connecting screw passes through a slide slot and extends into the external environment, the slide slot is arranged inside the outer side of the connecting seat, the slide slot is communicated with the sliding connection cavity, the other end of the connecting screw extends into the square cavity and is movably connected with the square block, the square cavity is arranged in the T-shaped support rod, the square block is slidably connected in the square cavity, the square block is fixedly connected to one end away from the connecting screw with two limiting teeth, the limiting teeth are meshed with a gear, the gear is movably connected in the T-shaped support rod, the gear is meshed in a tooth groove at one end away from the T-shaped support rod, and the tooth groove is arranged in the sliding connection cavity; The traction mechanism includes a traction rope, one end of which is movably connected to a connecting ring, one end of which is fixedly connected to the outside of a take-up wheel away from a connecting seat, and the take-up wheel is movably connected to a bracket, and the bracket is fixedly connected to a connecting plate, and the connecting plate is fixedly connected to an upper end of a bottom plate, and one end of the bracket is fixedly connected to a second motor, and an output end of the second motor is fixedly connected to the take-up wheel.

2. A welding device for the inner platform of a large diameter steel pipe pile according to claim 1, characterized in that: The lower end of the arc-shaped clamp plate is slidably connected to a T-shaped slot, and the T-shaped slot is opened in the upper end of the base plate. A positive and negative threaded screw is movably connected in the T-shaped slot. The lower side of the arc-shaped clamp plate is screwed to the outer side of the positive and negative threaded screw. One end of the positive and negative threaded screw extends into the external environment and is fixedly connected to the output end of the first motor. The first motor is fixedly connected to the base plate.

3. A welding device for the inner platform of a large diameter steel pipe pile according to claim 1, characterized in that: The inner gear ring is slidably connected to the outer side of the connecting seat, the inner side of the inner gear ring is meshed with the connecting gear, the connecting gear is movably connected in the connecting seat, a servo motor is fixedly installed in the connecting seat, and the output end of the servo motor is fixedly connected to the connecting gear.

4. A welding device for the inner platform of a large diameter steel pipe pile according to claim 1, characterized in that: The upper side of the T-shaped positioning block is slidably connected to the positioning cavity, the positioning cavity is opened in the lower end of the first positioning plate, a positioning spring is fixedly connected in the positioning cavity, the other end of the positioning spring is fixedly connected to the T-shaped positioning block, an electromagnet is provided on the upper side of the T-shaped positioning block, and the electromagnet is fixedly connected to the upper end of the positioning cavity.

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