A chain-type feeding and conveying device for a fully automatic welding machine for the ring seam of a grid pipe end

Abstract

The invention discloses a chain-type feeding and conveying device of a grid tube end annular seam fully automatic welding machine, comprising a chain conveying mechanism, a position adjusting mechanism, a tensioning adjusting mechanism, and a position detecting device for a tube to be welded. The input end of the chain conveying mechanism performs manual feeding, and the output end of the chain conveying mechanism is equipped with a fully automatic welding machine. The chain conveying mechanism comprises a machine base, a frame, a driven sprocket, a driving sprocket, a transmission chain, a sliding shaft, and a rotating shaft. Two frames are provided, and a sliding shaft is slidably installed in a sliding groove provided on the frame. A rotating shaft and a lead screw are rotatably installed in a cylindrical hole provided on the frame respectively, two driven sprockets are rotatably installed on both sides of the sliding shaft, two driving sprockets are connected and installed on both sides of the rotating shaft by a sliding flat key, a transmission chain is meshed and installed on the driven sprocket and the driving sprocket, two transmission chains are provided, and one end of the rotating shaft is connected to a motor through a belt drive. The invention has a simple structure, is convenient to use, reduces labor intensity, and improves conveying efficiency.

Description

Technical Field

[0001] The invention relates to a fully automatic welding machine for circumferential seams at ends of grid tubes, in particular to a chain-type feeding and conveying device. Background Art

[0002] At present, the automatic welding of the circumferential seam of the truss pipe end first requires manual spot welding of the pipe to be welded and the sealing plate before welding, and then the pipe to be welded is installed on the welding workbench for automatic welding. Therefore, the welding process requires manual continuous feeding of the pipe to be welded, which wastes human resources seriously. The main problems faced by the design of the fully automatic special welding machine for the circumferential seam of the truss pipe end are as follows: first, the design of the automatic upper and lower welding workbench device for the pipe to be welded, second, the automatic detection of the length of the pipe to be welded, and third, the design of the feeding and conveying device for the pipe to be welded. The design of the feeding and conveying device for the pipe to be welded is one of the key technologies to achieve fully automatic and efficient welding.

[0003] The Chinese patent "A loading and unloading device for a grid pipe end girth welder" (patent number: ZL201220179814.2) enables the pipe to be welded to automatically move up and down the welding workbench.

[0004] The Chinese patent "A device for detecting the position of the circular seam at the end of a grid pipe" (patent number: ZL201320169160.X) can realize the automatic detection of the weld. When two devices are used at the same time, the length of the welded pipe can be automatically detected. Summary of the invention

[0005] The purpose of the present invention is to solve the third problem mentioned above, that is, to solve the design problem of the feeding and conveying device for the pipe to be welded.

[0006] In order to solve the problem of feeding and conveying the pipe to be welded, the present invention provides a technical solution:

[0007] A chain-type feeding and conveying device of a grid tube end annular seam fully automatic welding machine comprises a chain conveying mechanism, a position adjustment mechanism, a tensioning adjustment mechanism, and a position detection device for a pipe to be welded. The input end of the chain conveying mechanism performs manual feeding, and the output end of the chain conveying mechanism is equipped with a fully automatic welding machine. The chain conveying mechanism comprises a machine base, a frame, a driven sprocket, a driving sprocket, a transmission chain, a sliding shaft, and a rotating shaft. The frame is provided with two, a slide groove is provided on the frame, a sliding shaft is slidably installed in the slide groove, a cylindrical hole is provided on the frame, a rotating shaft and a screw rod are rotatably installed in the cylindrical hole respectively, the two driven sprockets are rotatably installed on both sides of the sliding shaft, the two driving sprockets are connected and installed on both sides of the rotating shaft through a sliding flat key, one end of the rotating shaft is connected to a first motor through a belt drive, the first motor is fixedly installed on one side of the frame, and a transmission chain is meshed and installed on the driven sprocket and the driving sprocket, and two transmission chains are provided.

[0008] Preferably, there are three sliding shafts, which are respectively a first sliding shaft, a second sliding shaft and a third sliding shaft; there are two screw rods, which are respectively a first screw rod and a second screw rod; the first sliding shaft and the second sliding shaft are symmetrically arranged about the first screw rod, and the third sliding shaft and the rotating shaft are symmetrically arranged about the second screw rod; the first sliding shaft, the first screw rod, the second sliding shaft, the third sliding shaft, the second screw rod and the rotating shaft are at the same horizontal height.

[0009] Preferably, there are three slide grooves, which are respectively a stepped groove, a first rectangular groove, and a second rectangular groove; there are three cylindrical holes, which are respectively a first cylindrical hole, a second cylindrical hole, and a third cylindrical hole; the frame is provided with a stepped groove, a first cylindrical hole, a first rectangular groove, a second rectangular groove, a second cylindrical hole, and a third cylindrical hole from one end to the other, and the slide grooves and cylindrical holes are connected from front to back, and the stepped groove, the first cylindrical hole, the first rectangular groove, the second rectangular groove, the second cylindrical hole, and the third cylindrical hole are respectively matched with the first sliding shaft, the first screw rod, the second sliding shaft, the third sliding shaft, the second screw rod and the rotating shaft; a sealing plate is installed on the outer side of the first rectangular groove and the second rectangular groove, and two sealing plates are installed on the outer side of the stepped groove, and a rectangular hole is left between the two sealing plates.

[0010] Preferably, the cross-sections at both ends of the sliding shaft are rectangular, the diagonal length of the rectangle is smaller than the diameter of the sliding shaft, and the sides between the two rectangles at both ends of the sliding shaft are parallel or perpendicular to each other.

[0011] Preferably, the position adjustment mechanism includes two sub-position adjustment mechanisms, which include a screw, two adjustment seats, four connecting rods, and four retaining rings. The external threads on the front and rear outer rings of the screw have opposite rotation directions. The two adjustment seats are respectively installed on the front and rear outer rings of the screw through threaded connections. The two screws are connected by a synchronous belt transmission, and the synchronous belt is installed on the outside of the frame. The second motor for driving the two screws to rotate forward and reverse synchronously is installed on the outside of another frame relative to the synchronous belt.

[0012] Preferably, the adjustment seat has two arms, and each of the two arms is provided with a plurality of mounting screw holes compatible with the mounting bolts at equal intervals, and the two rows of the plurality of mounting screw holes equally spaced on the two arms are symmetrically arranged about the center of the adjustment seat; one end of the connecting rod is a circular ring, and the circular ring is rotatably connected to the annular groove formed by the hub and the retaining ring of the driven sprocket or the driving sprocket, and the rod-shaped part at the other end of the connecting rod is provided with a plurality of mounting grooves compatible with the mounting bolts at equal intervals, and the plurality of mounting grooves correspond one-to-one to the plurality of mounting screw holes.

[0013] Preferably, the inner diameter of the retaining ring is adapted to the outer diameter of the hub of the driven sprocket or the driving sprocket; the retaining ring is evenly provided with a plurality of first mounting screw holes adapted to the mounting bolts along the radial direction, and the hubs of the driven sprocket and the driving sprocket are evenly provided with a plurality of second mounting screw holes adapted to the mounting bolts along the radial direction, and the plurality of second mounting screw holes correspond one-to-one to the plurality of first mounting screw holes.

[0014] Preferably, a tensioning adjustment mechanism is installed in the stepped groove, and the tensioning adjustment mechanism includes a push rod, a block, a nut, a gear, a control block, an adjusting rod, a mounting frame, and a turning handle; an external thread is provided at one end of the push rod, and the cross-section of the other end of the push rod is rectangular, and the push rod is installed with a block and a threaded mounting nut in sequence starting from the end with the external thread, and the rectangular cross-section end of the push rod is slidably connected to the mounting control block; gear teeth are provided on the outer ring of the nut, and the gear teeth of the nut are meshed with the gear on the outside of the frame, the gear is fixedly mounted on the adjusting rod, and the adjusting rod is rotatably mounted on the mounting frame, and there are two mounting frames, and one end of the adjusting rod passes through one of the mounting frames and is fixedly assembled with the turning handle.

[0015] Preferably, the control block and the stopper are rectangular, and the rectangle is adapted to the wide groove of the stepped groove.

[0016] Preferably, the position detection device for the pipe to be welded includes two sub-position detection devices, and the sub-position detection devices include a travel switch and a switch mounting frame, the travel switch is fixedly mounted on the switch mounting frame, and the switch mounting frame is fixedly mounted on the adjustment seat.

[0017] The beneficial effects of the present invention are as follows: the present invention has a simple and reasonable structure and is easy to use. After placing a plurality of pipes to be welded on the chain-type feeding and conveying device at one time, the pipes to be welded can be fully automatically conveyed under the drive of the first motor. The meshing and conveying of the chain gear and the conveying chain have better stability and safety. The pipes to be welded are not easy to roll during the chain-type conveying process, and the tensioning adjustment mechanism is used to ensure the stable meshing of the chain gear and the conveying chain. The two travel switches at the output end of the chain-type feeding and conveying mechanism can detect the position state of the pipes to be welded, ensuring that the position of the pipes to be welded is correct before being placed on the fully automatic welding machine, ensuring safe and reliable conveying. The position adjustment mechanism enables the chain-type feeding and conveying device to achieve wide adaptability to pipes to be welded of different lengths, making the chain-type feeding and conveying device practical. Stronger. During maintenance, first loosen the mounting bolts of the adjusting seat and the connecting rod, and then drive the adjusting rod of the tensioning adjustment mechanism to rotate through the turning handle. The gear on the adjusting rod drives the nut to rotate, and the push rod moves under the action of the spiral transmission and under the control of the control block. The first sliding shaft realizes sliding movement in the step groove under the push of the push rod, and changes the distance between the rotating shaft and the first sliding shaft to achieve the tensioning of the transmission chain. After the tensioning is completed, tighten the mounting bolts between the adjusting seat and the connecting rod. Combined with the patented technology "A loading and unloading device for a grid pipe end girth welder" (patent number: ZL201220179814.2), it can realize the tasks of fully automatic transportation of the pipes to be welded and fully automatic upper and lower welding workbenches, which can effectively reduce the labor intensity of welding workers and improve welding work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the present invention after the conveyor chain and the step groove sealing plate are removed;

[0022] Figure 4 It is a schematic diagram of a rack of the present invention;

[0023] Figure 5 It is a schematic diagram of the sliding shaft of the present invention;

[0024] Figure 6 It is a schematic diagram of the rotating shaft of the present invention;

[0025] Figure 7 is a schematic diagram of a first screw rod of the present invention;

[0026] Figure 8 is a schematic diagram of a second screw rod of the present invention;

[0027] Fig. 9 It is a schematic diagram of the tension adjustment mechanism of the present invention;

[0028] Fig.10 It is a schematic diagram of a top rod of the present invention;

[0029] Fig.11 It is a schematic diagram of a nut of the present invention;

[0030] Fig.12 It is a schematic diagram of a stopper of the present invention;

[0031] Fig.13 It is a schematic diagram of a control block of the present invention;

[0032] Fig.14 It is a schematic diagram of the assembly relationship of some parts of the position adjustment mechanism of the present invention;

[0033] Fig.15 It is a schematic diagram of the first adjustment seat of the present invention;

[0034] Fig.16 It is a schematic diagram of a connecting rod of the present invention;

[0035] Fig.17 It is a schematic diagram of the driving sprocket of the present invention;

[0036] Fig.18 It is a schematic diagram of a driven sprocket of the present invention;

[0037] Fig.19 It is a schematic diagram of a retaining ring of the present invention;

[0038] In the figure: 1, chain conveying mechanism; 11, machine base; 12, frame; 121, stepped groove; 122, first cylindrical hole; 123, first rectangular groove; 124, second rectangular groove; 125, second cylindrical hole; 126, third cylindrical hole; 13, driven sprocket; 131, first driven sprocket; 132, second driven sprocket; 133, third driven sprocket; 134, second mounting screw hole; 14, driving sprocket; 141, second mounting screw hole; 142, sliding key keyway; 143, sliding key fixing screw hole; 15, conveying chain; 16, sliding shaft; 161, first sliding shaft; 162, second sliding shaft; 163, third sliding shaft; 17, rotating shaft; 171, keyway; 172, sliding key keyway; 18, sliding key fixing screw Bolt; 2. Position adjustment mechanism; 21. Screw rod; 211. First screw rod; 212. Second screw rod; 22. Adjustment seat; 221. First adjustment seat; 222. Second adjustment seat; 223. Mounting screw hole; 23. Connecting rod; 231. Mounting groove; 24. Retaining ring; 241. First mounting screw hole; 25. Mounting bolt; 26. Mounting bolt; 3. Tensioning adjustment mechanism; 31. Push rod; 32. Block; 33. Nut; 34. Gear; 35. Control block; 36. Adjustment rod; 37. Mounting bracket; 38. Turn handle; 4. Position detection device for the pipe to be welded; 41. Travel switch; 42. Switch mounting bracket; 5. First motor; 6. Second motor; 7. Closing plate; 71. First closing plate; 72. Second closing plate; 8. Synchronous belt. DETAILED DESCRIPTION

[0039] like Figure 1-19 As shown, this specific embodiment adopts the following technical scheme: a chain-type feeding and conveying device of a grid tube end circumferential seam fully automatic welding machine, comprising a chain conveying mechanism 1, a position adjustment mechanism 2, a tensioning adjustment mechanism 3, and a position detection device 4 for a pipe to be welded. The input end of the chain conveying mechanism 1 is manually fed, and the output end of the chain conveying mechanism 1 is equipped with a fully automatic welding machine. The chain conveying mechanism 1 comprises a machine base 11, a frame 12, a driven sprocket 13, a driving sprocket 14, a transmission chain 15, a sliding shaft 16, and a rotating shaft 17. The frame 12 is provided with two, and the frame 12 is provided with a There is a slide groove, in which a sliding shaft 16 is slidably installed, a cylindrical hole is opened on the frame 12, and a rotating shaft 17 and a screw rod 21 are rotatably installed in the cylindrical hole respectively, the two driven sprockets 13 are rotatably installed on both sides of the sliding shaft 16, and the two driving sprockets 14 are installed on both sides of the rotating shaft 17 through a sliding flat key connection, one end of the rotating shaft 17 is connected to the first motor 5 through a belt drive, and the first motor 5 is fixedly installed on one side of the frame 12, and a transmission chain 15 is meshed and installed on the driven sprocket 13 and the driving sprocket 14, and two transmission chains 15 are provided.

[0040] Among them, there are three sliding shafts 16, which are respectively a first sliding shaft 161, a second sliding shaft 162 and a third sliding shaft 163; there are two screw rods 21, which are respectively a first screw rod 211 and a second screw rod 212; the first sliding shaft 161 and the second sliding shaft 162 are symmetrically arranged about the first screw rod 211; the third sliding shaft 163 and the rotating shaft 17 are symmetrically arranged about the second screw rod 212; the first sliding shaft 161, the first screw rod 211, the second sliding shaft 162, the third sliding shaft 163, the second screw rod 212 and the rotating shaft 17 are at the same horizontal height; there are three slide grooves, which are respectively The stepped groove 121, the first rectangular groove 123, the second rectangular groove 124, the cylindrical holes have three, the three cylindrical holes are the first cylindrical hole 122, the second cylindrical hole 125, the third cylindrical hole 126, the frame 12 is sequentially provided with the stepped groove 121, the first cylindrical hole 122, the first rectangular groove 123, the second rectangular groove 124, the second cylindrical hole 125, the third cylindrical hole 126 from one end to the other, the slide groove and the cylindrical hole are all through, and the stepped groove 121, the first cylindrical hole 122, the first rectangular groove 123, the second rectangular groove 124, the second cylindrical hole 125, the third cylindrical hole 126 are respectively connected to the first sliding shaft 161, the first screw rod 211 , the second sliding shaft 162, the third sliding shaft 163, the second screw rod 212 and the rotating shaft 17 are adapted one by one; the cross-sections of the two ends of the sliding shaft 16 are rectangular, the diagonal length of the rectangle is smaller than the diameter of the sliding shaft, and the sides between the two rectangles are parallel or perpendicular to each other; a sealing plate is installed on the outer side of the first rectangular groove 123 and the second rectangular groove 124, and two sealing plates 7 are installed on the outer side of the stepped groove 121, and a rectangular hole is left between the two sealing plates 7; the position adjustment mechanism 2 includes two sub-position adjustment mechanisms, and the sub-position adjustment mechanism includes a screw rod 21, two adjustment seats 22, four connecting rods 23, and four retaining rings 24. The screw rod 2 The external threads on the front and rear outer rings are in opposite directions, the two adjustment seats 22 are respectively mounted on the front and rear outer rings of the screw rod 21 by threaded connection, the two screw rods 21 are connected by a synchronous belt 8, the synchronous belt 8 is mounted on the outside of the frame 12, and the second motor 6 for driving the two screw rods 21 to rotate forward and reverse synchronously is mounted on the outside of another frame 12 relative to the synchronous belt; the adjustment seat 22 has two arms, each of the two arms is provided with a plurality of mounting screw holes 223 that are compatible with the mounting bolts 25 at equal intervals, and the two rows of the plurality of mounting screw holes 223 at equal intervals on the two arms are symmetrically arranged about the center of the adjustment seat 22;One end of the connecting rod 23 is a circular ring, which is rotatably connected to the annular groove formed by the hub of the driven sprocket 13 or the driving sprocket 14 and the retaining ring 24. A plurality of mounting grooves 231 adapted to the mounting bolts 25 are evenly spaced on the rod-shaped portion at the other end of the connecting rod 23, and the plurality of mounting grooves 231 correspond to the plurality of mounting screw holes 223 one by one. The inner diameter of the retaining ring 24 is adapted to the outer diameter of the hub of the driven sprocket 13 or the driving sprocket 14, and the retaining ring 24 is evenly radially provided with a plurality of mounting grooves 231 adapted to the mounting bolts 25. 6, a plurality of second mounting screw holes 134 or second mounting screw holes 141 which are adapted to the mounting bolts 26 are uniformly opened in the radial direction on the hubs of the driven sprocket 13 and the driving sprocket 14, and the plurality of second mounting screw holes 134 or second mounting screw holes 141 correspond to the plurality of first mounting screw holes 241 one by one; a tension adjustment mechanism 3 is installed in the stepped groove 121, and the tension adjustment mechanism 3 includes a push rod 31, a stopper 32, a nut 33, a gear 34, a control block 35, an adjustment The section rod 36, the mounting frame 37, the rotating handle 38, the outer thread is provided at one end of the push rod 31, and the cross section of the other end of the push rod 31 is rectangular. The push rod 31 is installed with a stopper 32 in sequence from the end with the outer thread, and the nut 33 is threadedly connected to the installation. The rectangular cross-section end of the push rod is slidably connected to the installation control block 35; the outer ring of the nut 33 is provided with gear teeth, and the gear teeth of the nut 33 are meshed with the gear 34 on the outside of the frame. The gear 34 is fixedly installed on the adjusting rod 36, and the adjusting rod 36 is rotatably installed on the mounting frame. On the mounting frame 37, there are two mounting frames 37, one end of the adjusting rod 36 passes through one of the mounting frames 37 and is fixedly assembled with the turning handle 38; the control block 35 and the stopper 32 are rectangular, and the rectangle is adapted to the wide groove of the step groove 121; the position detection device 4 of the pipe to be welded includes two sub-position detection devices, and the sub-position detection device includes a travel switch 41 and a switch mounting frame 42, the travel switch 41 is fixedly mounted on the switch mounting frame 42, and the switch mounting frame 42 is fixedly mounted on the adjusting seat 222. ;

[0041] Specifically: A chain-type feeding and conveying device of a grid pipe end circumferential seam fully automatic welding machine. When in use, the first motor 5 drives the rotating shaft 17 to rotate, and the rotating shaft 17 drives the driving sprocket 14 to rotate through the sliding flat key, so that the transmission chain 15 meshed with it rotates on the driving sprocket 14 and the first driven sprocket 131, the second driven sprocket 132, and the third driven sprocket 133, and the pipes to be welded on the two transmission chains 15 are chain-fed and conveyed, and are conveyed by the transmission chains 15 to the position detection device of the pipes to be welded. If the position of the pipes to be welded is incorrect, If the position is correct, the conveying is stopped. If the position is correct, the conveying is continued to the output end of the chain feeding conveyor. The position adjustment mechanism enables the chain feeding conveyor to achieve wide adaptability to pipes of different lengths to be welded. During maintenance, first loosen the mounting bolts 25 of the adjustment seat 22 and the connecting rod 23, and then drive the adjusting rod 36 of the tensioning adjustment mechanism to rotate through the turning handle 38. The gear 34 on the adjusting rod 36 drives the nut 33 to rotate, and the push rod 31 realizes sliding motion under the action of the spiral transmission and under the control of the control block 35. A sliding shaft 161 realizes sliding movement in the stepped groove 121 to achieve tension adjustment of the conveying chain 15. After the tension adjustment is completed, the mounting bolt 25 between the adjusting seat 22 and the connecting rod 23 is tightened. The present invention has a simple and reasonable structure and is easy to use. After placing multiple pipes to be welded on the chain-type feeding and conveying device at one time, the full-automatic conveying of the whole welding process of the pipes to be welded can be realized. The stability and safety of the meshing transmission of the chain gear and the conveying chain are better. The pipes to be welded are not easy to roll during the chain-type conveying process, and the tension adjustment mechanism is used to ensure that the pipes to be welded are not easily rolled. The chain gear and the transmission chain are stably meshed. The two travel switches at the output end of the chain-type feeding and conveying mechanism can detect the position status of the pipe to be welded, ensuring that the position of the pipe to be welded is correct before being placed on the fully automatic welding machine, ensuring safe and reliable transportation. Combined with the patented technology "A loading and unloading device for a grid pipe end girth welder" (patent number: ZL201220179814.2), it can realize the tasks of fully automatic transportation of the pipe to be welded and fully automatic placement on the welding workbench, which can effectively reduce the labor intensity of welding workers and improve welding work efficiency.

[0042] The above shows and describes the basic principles and main features of the present invention as well as the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. A chain-type feeding and conveying device for a grid pipe end circumferential seam fully automatic welding machine, comprising a chain conveying mechanism, a position adjustment mechanism, a tensioning adjustment mechanism, and a position detection device for a pipe to be welded. Manual feeding is performed at the input end of the chain conveying mechanism, and a fully automatic welding machine is installed at the output end of the chain conveying mechanism. The chain conveying mechanism comprises a machine base, a frame, a driven sprocket, a driving sprocket, a transmission chain, a sliding shaft, and a rotating shaft, and is characterized in that: The frame is provided with two, a slide groove is opened on the frame, a sliding shaft is slidably installed in the slide groove, a cylindrical hole is opened on the frame, a rotating shaft and a screw rod are rotatably installed in the cylindrical holes respectively, the two driven sprockets are rotatably installed on both sides of the sliding shaft, the two driving sprockets are installed on both sides of the rotating shaft through a sliding flat key connection, one end of the rotating shaft is connected to the first motor through a belt drive, the first motor is fixedly installed on one side of the frame, and a transmission chain is meshed and installed on the driven sprocket and the driving sprocket, and two transmission chains are provided.

2. The chain-type feeding and conveying device of the grid pipe end circumferential seam fully automatic welding machine according to claim 1 is characterized in that: There are three sliding shafts, which are respectively the first sliding shaft, the second sliding shaft and the third sliding shaft; there are two screw rods, which are respectively the first screw rod and the second screw rod; the first sliding shaft and the second sliding shaft are symmetrically arranged about the first screw rod, and the third sliding shaft and the rotating shaft are symmetrically arranged about the second screw rod, and the first sliding shaft, the first screw rod, the second sliding shaft, the third sliding shaft, the second screw rod and the rotating shaft are at the same horizontal height.

3. The chain-type feeding and conveying device of the grid pipe end circumferential seam fully automatic welding machine according to claim 2 is characterized in that: There are three slide grooves, which are respectively a stepped groove, a first rectangular groove, and a second rectangular groove; there are three cylindrical holes, which are respectively a first cylindrical hole, a second cylindrical hole, and a third cylindrical hole; the frame is provided with a stepped groove, a first cylindrical hole, a first rectangular groove, a second rectangular groove, a second cylindrical hole, and a third cylindrical hole from one end to the other, and the slide grooves and cylindrical holes are connected front to back, and the stepped groove, the first cylindrical hole, the first rectangular groove, the second rectangular groove, the second cylindrical hole, and the third cylindrical hole are respectively matched with the first sliding shaft, the first screw rod, the second sliding shaft, the third sliding shaft, the second screw rod and the rotating shaft.

4. The chain-type feeding and conveying device of the grid pipe end circumferential seam fully automatic welding machine according to claim 1 is characterized in that: The cross sections at both ends of the sliding shaft are rectangular, the diagonal length of the rectangle is smaller than the diameter of the sliding shaft, and the sides between the two rectangles are parallel or perpendicular to each other.

5. The chain-type feeding and conveying device of the grid pipe end circumferential seam fully automatic welding machine according to claim 1 is characterized in that: The position adjustment mechanism includes two sub-position adjustment mechanisms, which include a screw, two adjustment seats, four connecting rods, and four retaining rings. The external threads on the front and rear outer rings of the screw have opposite rotation directions. The two adjustment seats are respectively installed on the front and rear outer rings of the screw through threaded connections. The two screws are connected by a synchronous belt transmission. The synchronous belt is installed on the outside of the frame. The second motor for driving the two screws to rotate forward and reverse synchronously is installed on the outside of another frame relative to the synchronous belt.

6. The chain-type feeding and conveying device of the grid pipe end circumferential seam fully automatic welding machine according to claim 5 is characterized in that: The adjustment seat has two arms, and each of the two arms is provided with a plurality of mounting screw holes compatible with the mounting bolts at equal intervals, and the two rows of the plurality of mounting screw holes equally spaced on the two arms are symmetrically arranged about the center of the adjustment seat; one end of the connecting rod is a circular ring, and the circular ring is rotatably connected to the annular groove formed by the hub and the retaining ring of the driven sprocket or the driving sprocket, and the rod-shaped part at the other end of the connecting rod is provided with a plurality of mounting grooves compatible with the mounting bolts at equal intervals, and the plurality of mounting grooves correspond one-to-one to the plurality of mounting screw holes.

7. The chain-type feeding and conveying device of the grid pipe end circumferential seam fully automatic welding machine according to claim 5 is characterized in that: The inner diameter of the retaining ring is adapted to the outer diameter of the hub of the driven sprocket or the driving sprocket; the retaining ring is evenly provided with a plurality of first mounting screw holes adapted to the mounting bolts along the radial direction, and the hubs of the driven sprocket and the driving sprocket are evenly provided with a plurality of second mounting screw holes adapted to the mounting bolts along the radial direction, and the plurality of second mounting screw holes correspond one to one to the plurality of first mounting screw holes.

8. The chain-type feeding and conveying device of the grid pipe end circumferential seam fully automatic welding machine according to claim 3 is characterized by: A tensioning adjustment mechanism is installed in the stepped groove, and the tensioning adjustment mechanism includes a push rod, a block, a nut, a gear, a control block, an adjusting rod, a mounting frame, and a turning handle; an external thread is provided at one end of the push rod, and the cross-section of the other end of the push rod is rectangular. The push rod is installed with a block and a threaded mounting nut in sequence starting from the end with the external thread, and the rectangular cross-section end of the push rod is slidably connected to the mounting control block; gear teeth are provided on the outer ring of the nut, and the gear teeth of the nut are meshed with the gear on the outside of the frame, the gear is fixedly installed on the adjusting rod, and the adjusting rod is rotatably installed on the mounting frame, and there are two mounting frames, and one end of the adjusting rod passes through one of the mounting frames and is fixedly assembled with the turning handle.

9. The chain-type feeding and conveying device of the grid pipe end circumferential seam fully automatic welding machine according to claim 8 is characterized in that: The control block and the stopper are rectangular, and the rectangle is adapted to the wide groove of the stepped groove.

10. The chain-type feeding and conveying device of the grid pipe end circumferential seam fully automatic welding machine according to claim 1 or 4, characterized in that: The position detection device for the pipe to be welded comprises two sub-position detection devices, and the sub-position detection devices comprise a travel switch and a switch mounting frame, wherein the travel switch is fixedly mounted on the switch mounting frame, and the switch mounting frame is fixedly mounted on the adjustment seat.

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