CN209190089U - Annular welds pick - Google Patents

Abstract

The utility model discloses an annular welding machine. The welding torch is installed on one side of a walking trolley by means of a mechanical arm. The walking trolley is connected to the outer surface of a circular guide rail by means of a Y-shaped bracket. The walking trolley is used to limit the welding torch along the outer edge of the annular guide rail. Walking, the chain drive track and the ring guide rail are installed side by side, the drive trolley is clamped on the outside of the chain drive track, and the drive trolley is engaged with the chain drive track, and the drive trolley and the walking trolley are installed side by side and connected by two transmission shafts. The chain drive track is used to fix the driving trolley on the outside of the welding workpiece, and the drive track surrounded by the chain drive track is a circular track coaxial with the ring guide rail; by installing the welding gun on the ring guide rail and the chain drive track The outer side of the steel pipe to be welded can quickly realize the welding of the steel pipe, and each part adopts an assembled structure, which is easy to disassemble, and is especially suitable for field operations.

Description

Ring welding machine

technical field

The utility model relates to the technical field of welding equipment, in particular to a portable ring welding machine.

Background technique

Due to the rapid development of my country's economy this year, the contradiction between the supply and demand of energy between the east and the west has become increasingly prominent. been more and more fully applied. In recent years, the successive construction of a series of large-diameter pipelines such as the West-East Gas Pipeline, the Western Pipeline, the Lanzhou-Zhengjiang Long-distance Pipeline, and the Second West-East Gas Pipeline indicates that the fourth construction peak of my country's long-distance pipelines has arrived.

Long-distance pipelines generally have the characteristics of field work, unstable welding environment, non-fixed power supply and grid power supply, inaccurate pipeline positioning, and difficulty in observing the internal formation of the weld bead. At present, the existing field welding equipment is very large. The problem shown is that the welding efficiency is low, and many cases still need to be done manually. Most of the existing equipment cannot be moved or is a large vehicle like a pipelayer, which cannot adapt to the small and complex field operation conditions.

Therefore, how to provide a welding machine that is easy to operate and disassemble in the field is an urgent problem to be solved by those skilled in the art.

Utility model content

The technical problem to be solved by the utility model is to provide a ring welding machine, by installing the welding gun on the outside of the steel pipe to be welded by means of the ring guide rail and the chain drive rail, the welding of the steel pipe can be quickly realized, and each part adopts an assembly structure, which is easy to disassemble , especially for field operations.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a ring welding machine, including a ring guide rail, a walking trolley, a mechanical arm, a welding torch, a chain drive track, a driving trolley and a wire feeding tube, and the welding torch is The mechanical arm is installed on the side of the walking trolley, and the walking trolley is connected to the outer surface of the circular guide rail by means of a Y-shaped bracket. The walking trolley is used to restrict the welding torch from walking along the outer edge of the circular guide rail. The chain drive track and the circular guide rail are installed side by side. The driving trolley is clamped on the outside of the chain drive track, and the drive trolley is engaged with the chain drive track. The drive trolley and the walking trolley are installed side by side and connected by two transmission shafts. The chain drive track is used to fix the drive trolley on the The outer side of the welding workpiece and the drive track enclosed by the chain drive track are circular tracks coaxial with the ring guide track.

The chain drive track includes a number of unit chain links that are connected end to end by means of pin shafts. The unit chain links are T-shaped block structures, and the two ends of the unit chain are respectively provided with corresponding bumps and grooves. The unit chain at the rear end The protrusion of the joint is inserted into the groove of the unit chain link at the front end, and the pin shaft is horizontally passed through. The open end of the unit chain link at the front end of the chain drive track is provided with an inverted tooth-shaped insert rod, which is located at the end of the chain drive track. The open end of the unit chain link is provided with a tooth-shaped socket, and the insertion rod and the socket are used for insertion when the chain drive track is surrounded by a circular track.

The outer wall of the annular guide rail is provided with a guide groove and a limit groove annular structure, the annular guide rail is used to be set on the outside of the steel pipe to be welded, the inner diameter of the annular guide rail is equal to the outer diameter of the steel pipe to be welded, and an annular guide groove is arranged on the outside of the annular guide rail The section of the annular guide groove is a rectangle with an upper middle opening, and the outer surface of the annular guide rail is also provided with two limiting grooves, and the two limiting grooves are respectively located on both sides of the guiding groove.

The driving trolley includes a housing, a driving motor, a driving gear, a driven gear and a guide wheel group. The housing includes a side plate, an end plate and a top plate. Two side plates, two end plates and a top plate form a Closed structure, the length of the end plate is half of the length of the side plate, the driving motor is fixedly installed in the semi-closed structure, the driving gear is fixedly installed at the power output end of the driving motor, and the driven gear is also installed in the semi-closed structure, the driven gear and the driving gear The driven gear is used to mesh with the chain drive track. The guide wheel set is fixedly installed on the inner side of the two side plates. The guide wheel set includes four sets of guide wheels. Two sets of guide wheels are fixedly installed on the inner lower end of each side plate. The circumference of the wheel lies in the same horizontal plane.

The walking trolley includes a vehicle frame, traveling wheels, positioning blocks and two transmission shafts, the two transmission shafts are installed in parallel, and the two ends are respectively connected with the driving trolley and the bearing of the vehicle frame, the traveling wheels include two sets, and the two sets of traveling wheels are The rotating shaft is installed on the outside of the vehicle frame, and the two sets of running wheels are clamped in the limiting grooves on the outside of the circular track.

A sprocket is fixedly installed in the middle of the transmission shaft, and a chain is installed in engagement with the sprocket. When the chain is used for welding steel pipes, the driving trolley and the walking trolley are bound to the outside of the steel pipe to be welded.

A limit frame is clamped in the guide groove of the circular track, and the limit frame includes a transverse shaft, a U-shaped bracket, a claw and a limit wheel, and the inner side of the U-shaped bracket opening is symmetrically installed for connecting the claws in the middle of the frame. The lower end of the U-shaped support is installed with a horizontal shaft by means of a vertical connecting rod, and the two ends of the horizontal shaft are provided with spacer wheels.

The mechanical arm comprises a base, a first swing arm, a second swing arm, a joint pin and a joint arm, the base comprises a base plate, a rotary device and a hinge support, the hinge support is installed on the base plate by means of the rotary device, and the hinge The upper end of the support is connected to the first swing arm through a pin shaft, the end of the first swing arm is connected to the second swing arm through a swing mechanism, the end of the second swing arm is connected to the articulated arm through a joint pin, and the end of the articulated arm is fixedly connected to the welding torch.

The welding torch includes a wire feeding tube, a torch head, an adapter block, a fixed arm, a swing frame and a hydraulic cylinder. The swing frame is fixedly connected to the end of the joint arm. Installed under the adapter block, the upper surface of the swing frame is fixed with an L-shaped fixed arm. The upper surface of the adapter block is hinged to the tail end of the hydraulic cylinder, and the end of the piston rod of the hydraulic cylinder is hinged to the open end of the fixed arm. The cylinder is used to drive the gun head to swing around the axis of the pin shaft between the adapter block and the swing frame.

The gun head includes a shell, a fixed plate, a wire guide tube, a wire feeding mechanism, a telescopic motor, a lead screw nut, a telescopic sleeve and a welding head. The shell is a circular tubular structure, and its end is fixedly connected with an adapter block. The middle part of the casing is connected with the wire feeding tube through a conduit, and the fixing plate is vertically installed in the casing. The welding wire of the pipe and the conduit passes through the wire feeding mechanism, which is used to send the welding wire to the welding head. The telescopic mechanism includes two sets of telescopic motors, two sets of lead screws, and two sets of lead screw nuts installed symmetrically on the same side of the fixed plate. And two sets of telescopic sleeves, two sets of screw nuts are connected with the fixed plate, and the two sets of screw nuts are respectively threaded on the two sets of screw nuts, the end of the screw is threaded to the telescopic sleeve, and the welding head is fixedly installed at the end of the telescopic sleeve The power output end of the telescopic motor is connected to the end of the lead screw on the corresponding side through a gear transmission mechanism, and a connecting plate is arranged between the two telescopic sleeves, and the connecting plate is slidingly matched with the surface of the fixing plate.

The beneficial effect of adopting the above technical scheme is that: by using the circular guide rail as the guiding device of the walking trolley, and installing the welding torch on the walking trolley, the welding torch can move circularly around the track to be welded, and the walking trolley passes through the limit frame and the limit frame. The positioning wheel is clamped with the guide groove and the limit groove on the outer wall of the circular guide rail to make the walking trolley more stable and easy to weld; the utility model also uses a chain drive track that can be enclosed on the outer side of the steel pipe to be welded as a driving auxiliary device. The driving trolley is connected to the chain drive track through gear meshing, and the chain drive track can determine how many unit chain links to install according to the diameter of the steel pipe to be welded. The unit chain links adopt a T-shaped block structure. After the steel pipe is to be welded, the guide wheel group of the driving trolley is located between the steel pipe to be welded and the unit chain link to ensure the stability of the driving trolley; at the same time, the chain drive track, the driving trolley, the walking trolley, the mechanical arm and the The torches are all detachable structures, which can be quickly assembled and easily disassembled, especially suitable for field operations.

In the utility model, a telescopic mechanism is arranged in the gun head, and the telescopic mechanism drives the welding head to move along the axis of the catheter, thereby realizing the expansion and contraction of the welding head, which greatly improves the flexibility and is convenient to meet the precision requirements of the welding operation.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of the utility model mechanical arm;

Fig. 3 is a structural schematic diagram of a welding torch;

Fig. 4 is a schematic diagram of the internal structure of the gun head;

Figure 5 Schematic diagram of the ring guide rail structure;

Figure 6 is a partial enlarged view of Figure 5;

Fig. 7 is a schematic diagram of the structure of the driving trolley;

Fig. 8 is a schematic diagram of the internal structure of Fig. 7;

Fig. 9 is a schematic diagram of the structure of the walking trolley;

Fig. 10 is a schematic diagram of chain drive track structure;

Fig. 11 is a schematic structural view of the front-end unit chain link of the chain drive track;

Fig. 12 is a schematic diagram of the tail end structure of the chain drive track;

Fig. 13 is a structural schematic diagram of a spacer;

Among them: 1. Chain drive track; 1-1, unit chain link; 1-2, pin hole; 1-3, inserting rod; 1-4, jack; 2, chain; 3, driving trolley; 3-1 , shell; 3-2, guide wheel group; 3-3, driven gear; 3-4, driving gear; 3-5, drive motor; 4, wire feeding tube; 5, mechanical arm: 5-1, base Seat; 5-2, first swing arm; 5-3, second swing arm; 5-4, joint pin; 5-5, joint arm; 6, welding torch; 6-1, fixed arm; 6-2, Hydraulic cylinder; 6-3, swing frame; 6-4, gun head; 6-4-1, fixed plate; 6-4-2, guide wire tube; 6-4-3, wire feeding mechanism; 6-4- 4. Telescopic motor; 6-4-5, screw nut; 6-4-6, telescopic sleeve; 6-4-7, welding head; 7. Ring guide rail; 7-1, guide rail body; 7-2, Guide groove; 7-3, limit groove; 8, walking trolley; 8-1, sprocket wheel; 8-2, transmission shaft; 8-3, positioning block; 8-4, vehicle frame; 8-5, traveling wheel ; 9, limit frame; 9-1, claw; 9-2, U-shaped bracket; 9-3, limit wheel.

Detailed ways

Below in conjunction with the accompanying drawings in the utility model embodiment, the technical solution in the utility model embodiment is clearly and completely described, obviously, the described embodiment is only a part of the utility model embodiment, rather than all implementation example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the following description, a lot of specific details have been set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways that are different from those described here, and those skilled in the art can do so without violating the connotation of the utility model. Under the circumstances, similar promotion is done, so the utility model is not limited by the specific embodiments disclosed below.

As shown in Figure 1, the utility model discloses a circular welding machine, comprising a circular guide rail 7, a walking trolley 8, a mechanical arm 5, a welding torch 6, a chain drive track 1, a driving trolley 3 and a wire feeding tube 4, the The welding gun 6 is installed on one side of the walking trolley 8 by means of the mechanical arm 5, and the walking trolley 8 is connected to the outer surface of the annular guide rail 7 by means of a Y-shaped bracket. The walking trolley 8 is used to limit the welding torch 6 to walk along the outer edge of the annular guide rail 7. The chain drive track 1 and the circular guide rail 7 are installed side by side, the drive trolley 3 is clamped on the outside of the chain drive track 1, and the drive trolley 3 and the chain drive track 1 are engaged and installed, the drive trolley 3 and the walking trolley 8 are installed side by side, and pass Two transmission shafts 8-2 are connected, and the chain drive track 1 is used to fix the driving trolley 3 outside the welding workpiece, and the drive track surrounded by the chain drive track 1 is a circular track coaxial with the ring guide rail 7.

Referring to accompanying drawings 10-12, the chain drive track 1 includes several unit chain links 1-1 connected end to end by means of pin shafts. The unit chain links 1-1 are block structures with T-shaped end faces, and the two ends are respectively Correspondingly set the bumps and grooves, the bump of the unit chain link 1-1 at the rear end is inserted into the groove of the unit chain link 1-1 at the front end, and the pin shaft is horizontally passed through, and the front end of the chain drive track 1 The open end of the unit chain link 1-1 is provided with an inverted tooth-shaped insertion rod 1-3, and the open end of the unit chain link 1-1 at the end of the chain drive track 1 is provided with an inverted tooth-shaped jack 1-4, and the insertion rod 1-3 and jack 1-4 are used for plugging in when the chain drive track 1 surrounds a circular track.

Referring to accompanying drawing 2-3, described annular guide rail 7 is provided with guide groove 7-2 and limit groove 7-3 annular structure for outer wall, and annular guide rail 7 is used for being set on the outer side of the steel pipe to be welded, and the inner diameter of annular guide rail 7 is the same as that to be welded. The outer diameters of welded steel pipes are equal, and an annular guide groove 7-2 is arranged on the outside of the annular guide rail 7. The cross section of the annular guide groove 7-2 is a rectangle with an upper middle opening, and the outer surface of the annular guide rail 7 is also provided with two limit grooves 7- 3. The two limit grooves 7-3 are respectively located on both sides of the guide groove 7-2.

Referring to the accompanying drawings 7-8, the driving trolley 3 includes a housing 3-1, a driving motor 3-5, a driving gear 3-4, a driven gear 3-3 and a guide wheel group 3-2, and the housing 3 -1 includes side plates, end plates and top plates, two side plates, two end plates and a top plate form a semi-closed structure, the length of the end plates is half of the length of the side plates, and the driving motor 3-5 is fixedly installed in the semi-closed structure In the structure, the driving gear 3-4 is fixedly installed at the power output end of the driving motor 3-5, and the driven gear 3-3 is also installed in the semi-closed structure, the driven gear 3-3 meshes with the driving gear 3-4, and the driven gear 3-4 -3 is used to mesh with the chain drive track 1, and the guide wheel set 3-2 is fixedly installed on the inner side of the two side plates, and the guide wheel set 3-2 includes four sets of guide wheels, and two sets of guide wheels are fixedly installed on the inner lower end of each side plate , the circumference of the four sets of guide wheels is located in the same horizontal plane, the driven gear of the trolley meshes with the chain drive track during operation, and each unit chain link is equivalent to a tooth. When in use, the chain drive track is installed around the On the outer side of the steel pipes to be welded, they are connected end to end to form a circular track, and the inner surface of the steel pipes is closely attached to the outer wall of the steel pipes to be welded to prevent the radial and axial deviation of the driving trolley.

Referring to accompanying drawing 9, described traveling trolley 8 comprises vehicle frame 8-4, traveling wheel 8-5, positioning block 8-3 and two transmission shafts 8-2, and two transmission shafts 8-2 are installed in parallel, and both ends Connect with driving trolley 3 and vehicle frame 8-4 bearing respectively, road wheel 8-5 comprises two sets, two sets of road wheels 8-5 are installed on the outside of vehicle frame 8-4 by means of rotating shaft, two sets of road wheels 8-5 card Connected to the limit groove 7-3 on the outside of the circular track, the traveling trolley is in a passive state during operation. It is connected to drive the trolley through two transmission shafts, and the driven gear of the driving trolley meshes with the chain drive track. The two sets of traveling wheels are clamped in the limit groove of the circular guide rail, and the limit frame and the frame are flexibly connected to support and drive the welding torch. The sprocket on the root transmission shaft is equipped with a chain, the chain meshes with the two sprockets respectively, and the chain is located outside the transmission shaft. At the same time, the two ends of the chain are connected to form a continuous chain. The sprockets are all on the inside of the chain.

Referring to accompanying drawing 9, sprocket 8-1 is fixedly installed in the middle part of the transmission shaft 8-2, and chain 2 is installed in engagement with sprocket 8-1. On the outside of the welded steel pipe, the function of the chain is to compress the transmission shaft, and then compress the traveling trolley and the driving trolley to prevent the meshing failure between the driven gear of the driving trolley and the chain drive track.

Referring to accompanying drawings 5-6, the guide groove 7-2 of the circular track is clamped with a limit frame 9, and the limit frame 9 includes a transverse shaft, a U-shaped bracket, claws and a limit wheel, and the inner side of the open end of the U-shaped bracket Symmetrical installation is used to connect the claws in the middle of the frame 8-4. The flexible connection between the claws and the frame is adopted. The lower end of the U-shaped bracket is installed with a horizontal shaft by means of a vertical connecting rod. A reset spring is installed outside the vertical connecting rod to reset The lower end of the spring is connected with the vertical connecting rod, and the upper end is pressed against the lower end of the U-shaped bracket. The U-shaped bracket is set on the upper end of the vertical connecting rod. Limiting wheels are set at both ends of the horizontal axis, and the horizontal axis and the limiting wheel are located inside the guide groove 7-2. , the circumference of the horizontal axis is perpendicular to the side wall of the guide groove 7-2. The function of the circular guide rail is to enable the walking trolley to drive the welding torch to achieve circular motion on the outer wall of the pipe to be welded. The circular guide rail needs to be customized according to the outer diameter of the pipe to be welded. Diameter steel pipes use ring guide rails of different diameters. Guide grooves and limit grooves are respectively set on the outer wall of the ring guide rails, and the traveling trolley is clamped with the limit to ensure the stable operation of the walking trolley in the guide groove and improve the position accuracy of the welding torch.

Referring to accompanying drawing 2, described mechanical arm 5 comprises base 5-1, first swing arm 5-2, second swing arm 5-3, joint pin shaft 5-4 and joint arm 5-5, base 5- 1 includes a bottom plate, a slewing device and a hinge support, the hinge support is installed on the bottom plate by means of a slewing device, the upper end of the hinge support is connected to the first swing arm 5-2 through a pin shaft, and the end of the first swing arm 5-2 passes through a swing mechanism The second swing arm 5-3 is connected, the end of the second swing arm 5-3 is connected to the joint arm 5-5 through the joint pin shaft 5-4, and the end of the joint arm 5-5 is fixedly connected to the welding torch 6.

Referring to accompanying drawing 3, described welding torch 6 comprises wire feeding pipe 4, torch head 6-4, adapter block, fixed arm 6-1, swing frame 6-3 and hydraulic cylinder 6-2, and described swing frame 6-3 It is fixedly connected with the end of the joint arm 5-5, the middle part of the pendulum 6-3 is connected to the adapter block by means of a pin shaft, the gun head 6-4 is fixedly installed under the adapter block, and the upper surface of the pendulum 6-3 is fixedly installed in an L shape The fixed arm 6-1, the upper surface of the adapter block is hinged to the cylinder tail end of the hydraulic cylinder 6-2, the end of the piston rod of the hydraulic cylinder 6-2 is hinged to the open end of the fixed arm 6-1, and the hydraulic cylinder 6-2 It is used to drive the torch head 6-4 to swing around the axis of the pin shaft between the adapter block and the swing frame 6-3, effectively improving the freedom of movement of the welding torch and improving the adaptability of welding operations.

Referring to accompanying drawing 4, described gun head 6-4 comprises casing, fixed plate 6-4-1, guide wire tube 6-4-2, wire feeding mechanism 6-4-3, telescopic motor 6-4-4, wire Bar nut 6-4-5, telescopic sleeve 6-4-6 and welding head 6-4-7, the shell is a circular tubular structure, and its end is fixedly connected with the adapter block, the middle part of the shell is connected to the wire through the conduit Tube connection, the fixed plate 6-4-1 is vertically installed in the shell, and the fixed plate 6-4-1 is fixedly arranged with the guide wire tube 6-4-2, the wire feeding mechanism 6-4-3 and the telescopic Mechanism, the welding head 6-4-7 is installed at the end of the telescopic mechanism, and the welding wire passing through the wire feeding tube and the conduit passes into the wire feeding mechanism 6-4-3, and the wire feeding mechanism 6-4-3 is used to send the welding wire to the welding head 6-4-7, the telescopic mechanism comprises two sets of telescopic motors 6-4-4, two sets of leading screws, two sets of leading screw nuts 6-4-5 and two Set telescopic sleeve 6-4-6, two sets of lead screw nuts 6-4-5 are connected with fixed plate 6-4-1, two sets of lead screw nuts 6-4-5 are connected with two sets of lead screw nuts 6-4 -5 threaded installation, the end of the lead screw is threaded to the telescopic sleeve 6-4-6, the welding head 6-4-7 is fixedly installed at the end of the telescopic sleeve 6-4-6, and the power output end of the telescopic motor 6-4-4 passes through The gear transmission mechanism is connected to the end of the lead screw on the corresponding side, and a connecting plate is arranged between the two telescopic sleeves 6-4-6, and the connecting plate and the surface of the fixed plate 6-4-1 are slidably matched, and the wire feeding mechanism is fed to the existing 3D printer. The mechanism is similar, including two counter-rotating wheels with opposite directions. The counter-rotating wheels are driven by a motor, and the welding wire is held between the two counter-rotating wheels. The wire feeding speed is adjusted by controlling the speed of the motor.

In the specific application process, the utility model uses the circular guide rail as the guiding device of the walking trolley, and installs the welding torch on the walking trolley, so that the welding torch can move circularly around the track to be welded, and the walking trolley passes through the limit frame and the limit wheel It is clamped with the guide groove and the limit groove on the outer wall of the circular guide rail, making the walking trolley more stable and convenient for welding; the utility model also uses a chain drive track that can be enclosed on the outer side of the steel pipe to be welded as a driving auxiliary device to drive the trolley It is connected with the chain drive track through gear meshing, and the chain drive track can determine how many unit chain links to install according to the diameter of the steel pipe to be welded. The unit chain link adopts a block structure with a T-shaped end face. Behind the steel pipe, the guide wheel group of the driving trolley is located between the steel pipe to be welded and the unit chain link to ensure the stability of the driving trolley; at the same time, the chain drive track, the driving trolley, the walking trolley, the mechanical arm and the welding torch in the utility model The rooms are all detachable structures, which can be quickly assembled and easily disassembled, especially suitable for field operations.

Claims (10)

1. a kind of annular welds pick, it is characterised in that: including ring-shaped guide rail (7), walking dolly (8), mechanical arm (5), welding gun (6), chain type driving track (1), driving trolley (3) and wire-feeding pipe (4), the welding gun (6) are expert at by means of mechanical arm (5) installation Trolley (8) side is walked, walking dolly (8) is connected to ring-shaped guide rail (7) outer surface by means of Y shaped bracket, and walking dolly (8) is used for The outer rim that welding gun (6) are limited along ring-shaped guide rail (7) is walked, and chain type driving track (1) and ring-shaped guide rail (7) is installed side by side, Driving trolley (3) is installed on the outside of chain type driving track (1) and trolley (3) is driven to engage installation with chain type driving track (1), Driving trolley (3) is installed side by side with walking dolly (8) and is connect by two transmission shafts (8-2), and chain type drives track (1) to use It is and ring-shaped guide rail in trolley (3) will be driven to be fixed on the driving track that on the outside of welding workpiece and chain type driving track (1) surrounds (7) coaxial circular trace.

2. annular welds according to claim 1 pick, it is characterised in that: chain type driving track (1) includes several borrows Help the end to end unit chain link (1-1) of pin shaft, unit chain link (1-1) is the T-shaped block structure in end face, both ends difference It is correspondingly arranged convex block and groove, the unit chain link (1-1) that the convex block insertion positioned at the unit chain link (1-1) of rear end is located at front end is recessed In slot and level wears pin shaft, and pawl is arranged in the open end for being located at the unit chain link (1-1) of chain type driving track (1) front end Shape inserted link (1-3), the open end for being located at the unit chain link (1-1) of chain type driving track (1) least significant end are provided with pawl shape jack (1-4), inserted link (1-3) and jack (1-4) are used for the grafting when chain type driving track (1) surrounds circular orbit.

3. annular welds according to claim 2 pick, it is characterised in that: the ring-shaped guide rail (7) offers for outer wall and leads Slot (7-2) and limiting slot (7-3) ring structure, ring-shaped guide rail (7) is for being sleeved on the outside of steel pipe to be welded, ring-shaped guide rail (7) Internal diameter it is equal with the outer diameter of steel pipe to be welded, the guide groove (7-2) of setting annular, annular guide channel (7-2) on the outside of ring-shaped guide rail (7) Section present the rectangles of intermediate openings, ring-shaped guide rail (7) outer surface is additionally provided with twice limiting slot (7-3), twice limiting slot (7- 3) two sides of guide groove (7-2) are located at.

4. annular welds according to claim 3 pick, it is characterised in that: the driving trolley (3) include shell (3-1), Driving motor (3-5), driving gear (3-4), driven gear (3-3) and guide wheel group (3-2), the shell (3-1) includes side Plate, end plate and top plate, two blocks of side plates, two end plates and one piece of top plate surround semi-closed structure, and the length of end plate is side plate length Half, driving motor (3-5) is fixedly mounted in semi-closed structure, and master is fixedly mounted in driving motor (3-5) power output end Moving gear (3-4) is also installed driven gear (3-3) in semi-closed structure, and driven gear (3-3) is engaged with driving gear (3-4), Driven gear (3-3) is used for and chain type driving track (1) engagement, and guide wheel group (3-2) is fixedly mounted in two pieces of side plate interior sides, guiding Wheel group (3-2) includes four sets of directive wheels, and two sets of directive wheels, the contour position of four sets of directive wheels is fixedly mounted in every piece of side plate interior sides lower end In in same level.

5. annular welds according to claim 4 pick, it is characterised in that: the walking dolly (8) include vehicle frame (8-4), Traveling wheel (8-5), locating piece (8-3) He Lianggen transmission shaft (8-2), two transmission shafts (8-2) in parallel installation and both ends respectively with Driving trolley (3) is connected with vehicle frame (8-4) bearing, and traveling wheel (8-5) includes two sets, and two sets of traveling wheels (8-5) are by means of shaft It is mounted on the outside of vehicle frame (8-4), two sets of traveling wheels (8-5) are connected to the limiting slot (7-3) on the outside of circular orbit Nei.

6. annular welds according to claim 5 pick, it is characterised in that: chain is fixedly mounted in the middle part of the transmission shaft (8-2) It takes turns (8-1), installation chain (2) is engaged with sprocket wheel (8-1), trolley (3) and walking will be driven small when chain (2) is used for welded still pipe Vehicle (8) is bundled on the outside of steel pipe to be welded.

7. annular welds according to claim 6 pick, it is characterised in that: clamped in the guide groove (7-2) of the circular orbit Position-limited rack (9), position-limited rack (9) include horizontal axis, U-bracket, claw and position-limited wheel, are symmetrically installed use on the inside of U-bracket open end Horizontal axis, the setting limit of horizontal axis both ends are installed by means of vertical link in claw in the middle part of connecting vehicle frame (8-4), U-bracket lower end Wheel, horizontal axis and position-limited wheel are located on the inside of guide groove (7-2), and the contour of horizontal axis is vertical with guide groove (7-2) side wall.

8. annular welds according to claim 7 pick, it is characterised in that: the mechanical arm (5) includes pedestal (5-1), One swing arm (5-2), the second swing arm (5-3), joint pin shaft (5-4) and joint arm (5-5), pedestal (5-1) include bottom plate, revolution dress It sets and hinged-support, hinged-support is mounted on bottom plate by means of slewing equipment, hinged-support upper end connects the first swing arm (5- by pin shaft 2), the first swing arm end (5-2) connects the second swing arm (5-3) by swing mechanism, and the end the second swing arm (5-3) passes through articulating pin Axis (5-4) connecting joint arm (5-5), the end joint arm (5-5) are fixedly connected with welding gun (6).

9. annular welds according to claim 8 pick, it is characterised in that: the welding gun (6) includes wire-feeding pipe (4), pipette tips (6-4), transfer block, fixed arm (6-1), rocker (6-3) and hydraulic cylinder (6-2), the rocker (6-3) and the end joint arm (5-5) End is fixedly connected, and connects transfer block by means of pin shaft in the middle part of rocker (6-3), and pipette tips (6-4) are fixedly mounted below transfer block, pendulum The upper surface frame (6-3) is fixedly mounted L-shaped fixed arm (6-1), the cylinder body of the hinged hydraulic cylinder in transfer block upper surface (6-2) Tail end, the piston-rod end of hydraulic cylinder (6-2) and the open end fixed arm (6-1) are hinged, and hydraulic cylinder (6-2) is for driving pipette tips The axis oscillating of the pin shaft of (6-4) between transfer block and rocker (6-3).

10. annular welds according to claim 9 pick, it is characterised in that: the pipette tips (6-4) include shell, fixed plate (6-4-1), wire leading pipe (6-4-2), wire feeder (6-4-3), telescope motor (6-4-4), feed screw nut (6-4-5), telescopic (6-4-6) and plumb joint (6-4-7) are managed, the shell is round tube shape structure and its end is fixedly connected with transfer block, in shell Portion is connect by conduit with wire-feeding pipe, and fixed plate (6-4-1) is mounted vertically in shell, in fixed plate (6-4-1) from top to bottom Wire leading pipe (6-4-2), wire feeder (6-4-3) and telescoping mechanism, telescoping mechanism end erecting and welding head (6-4- is fixedly installed 7), the welding wire across wire-feeding pipe and conduit penetrates wire feeder (6-4-3), and wire feeder (6-4-3) is for sending welding wire to weldering Connector (6-4-7), telescoping mechanism are included in two sets of telescope motor (6-4- that fixed plate (6-4-1) the same face is left and right symmetrically arranged 4), two sets of lead screws, two sets of feed screw nuts (6-4-5) and two sets of telescopic sleeves (6-4-6), two sets of feed screw nuts (6-4-5) and solid Fixed board (6-4-1) connection, two sets of feed screw nuts (6-4-5) are installed respectively at two sets of feed screw nut (6-4-5) screw threads, lead screw end It is threadedly coupled telescopic sleeve (6-4-6), plumb joint (6-4-7) is fixedly mounted on the end telescopic sleeve (6-4-6), telescope motor (6-4-4) power output end connects the lead screw end of respective side by gear drive, between two telescopic sleeves (6-4-6) Gusset piece is set, and gusset piece is slidably matched with the surface fixed plate (6-4-1).