CN219444017U - Cold-rolled steel tube butt welding machine - Google Patents

Abstract

The utility model relates to a cold steel pipe butt welding machine that pricks, including the workstation, the workstation is equipped with the welding machine, two sets of clamping assembly of workstation, clamping assembly includes the connecting piece, the rotating member, first clamping plate, the second clamping plate, motor one, gear one, rack one and rack two, connecting piece and workstation sliding connection, the workstation is equipped with drive arrangement, rotating member rotates with the connecting piece to be connected, rectangular chamber has been seted up to the rotating member, first clamping plate and second clamp all sliding connection in rectangular intracavity, first clamping plate is equipped with two support arms, the support arm rotates and is connected with the clamping claw, second clamping plate is unanimous with first clamping plate structure, motor one with rotate a fixed connection, gear one and motor one output shaft fixed connection, rack one is fixed in first clamping plate, rack two is fixed in the second clamping plate, rack one and rack two all with gear one meshing. The method has the effect of improving the stability of the cold-rolled steel pipe during welding.

Description

Cold-rolled steel tube butt welding machine

Technical Field

The application relates to the technical field of steel pipe butt welding, in particular to a cold-rolled steel pipe butt welding machine.

Background

The cold-rolled steel tube has the characteristic of high precision, is commonly used in some precise instruments and hydraulic equipment, and is usually standard in size, so that secondary processing such as cutting or welding is needed when the cold-rolled steel tube is used.

The related art can refer to Chinese patent publication No. CN217596155U to disclose a steel tube butt welding machine with automatic butt welding function, which comprises a frame, wherein a welding machine is arranged on the frame, a first rotating shaft and a second rotating shaft are rotatably arranged on the frame, and a first roller and a second roller are fixedly sleeved on the first rotating shaft and the second rotating shaft; the frame is provided with a butt joint assembly for driving two steel pipes to butt against each other, and the frame is provided with a rotating assembly for driving the first rotating shaft and the second rotating shaft to rotate in the same direction.

Aiming at the related technology, when the cross section of the cold-rolled steel pipe is regular polygon, the first roller and the second roller are not easy to stably drive the cold-rolled steel pipe to rotate, so that the cold-rolled steel pipe is easy to be unstable in butt welding.

Disclosure of Invention

In order to improve stability of cold rolled steel pipes during welding, the application provides a cold-rolled steel pipe butt welding machine.

The application provides a cold-rolled steel pipe butt welding machine, adopts following technical scheme:

the utility model provides a cold steel pipe butt welding machine that pricks, comprises a workbench, the workstation is equipped with two sets of clamping components that set up as central symmetry with the welding machine, clamping components includes the connecting piece, the rotating piece, first clamping plate, the second clamping plate, motor one, gear one, rack one and rack two, connecting piece and workstation sliding connection, the workstation is equipped with drive arrangement, the connecting piece is worn to establish by the rotating piece and rotate rather than to be connected, the rectangular chamber has been seted up to the rotating piece, first clamping plate sliding connection is in the rectangular intracavity, first clamping plate is equipped with two support arms along the direction of height, support arm keep away from first clamping plate one end rotation and is connected with the clamping jaw, second clamping plate is unanimous with first clamping plate structure, and also with sliding connection in the rectangular intracavity, motor one and rotating piece fixed connection, gear one and motor one output shaft fixed connection, rack one is fixed in first clamping plate, rack two is fixed in the second clamping plate, rack one and rack two crisscross setting, and rack two all mesh with gear one.

Through adopting above-mentioned technical scheme, place cold steel pipe between first clamping plate and second clamping plate, motor one-tenth forward rotation of driving gear, gear one-tenth of driving rack and rack two remove, and then make first clamping plate and second clamping plate be close to each other. The supporting arm promotes and presss from both sides tight claw and contradicts with cold rolled steel pipe, when the tight claw of clamp only has a contact point with cold bundle steel pipe, and the supporting arm continues to promote the tight claw removal, and then makes the tight claw of clamp continue to be close to and then its conflict to cold drawn steel pipe, and the tight claw of clamp is comparatively stable to the support location of cold drawn steel pipe this moment. After the two cold drawn steel pipes are clamped, the driving device pushes the two cold drawn steel pipes to be close to each other through the connecting piece, and the rotating piece drives the cold drawn steel pipes to rotate, so that welding is performed along the joint of the two cold drawn steel pipes, and the cold drawn steel pipes are stable during welding.

Optionally, among the two support arms, the support arm that is close to motor one is established to the support arm, and another support arm is established to the support arm down, and vertical groove has been seted up to first clamping plate, goes up support arm and support arm down and all wears to establish vertical groove and with first clamping plate sliding connection, and first clamping plate has set firmly motor two, and the fixedly connected with threaded rod one of motor two output shafts, threaded rod one wear to establish the support arm and rather than threaded connection, threaded rod one keep away from the one point fixedly connected with spiral rod two that the motor two is opposite, threaded rod two wear to establish support arm down and rather than threaded connection, and the second clamping plate sets up the same with first clamping plate.

Through adopting above-mentioned technical scheme, motor two drive threaded rod one and threaded rod two rotate, and then make last support arm and lower support arm synchronous movement, distance between support arm and the lower support arm on through motor two control for first clamping plate and second clamping plate can press from both sides the cold drawn steel tube of different diameters.

Optionally, connecting piece fixedly connected with motor three, motor three output shaft are fixed can be connected with gear two, and the one end fixedly connected with ring gear of rotating member departure welding machine, ring gear along circumference fixedly connected with tooth piece, tooth piece all meshes with gear two.

Through adopting above-mentioned technical scheme, motor three drives gear two and rotates, and gear two drives the ring gear through the meshing transmission with the tooth piece and rotates, and the ring gear drives the rotation piece and rotates for it is comparatively convenient when rotating the piece and driving cold drawn steel tube rotation.

Optionally, the drive arrangement is cylinder one, and cylinder one output and connecting piece fixed connection, connecting piece lower extreme fixedly connected with sliding block, the workstation have been seted up with the rectangular channel of sliding block adaptation, sliding block sliding connection in rectangular inslot, rectangular inslot wall has set firmly the guide arm, and the guide arm wears to establish the sliding block and rather than sliding connection.

Through adopting above-mentioned technical scheme, spacing groove and guide arm carry out spacingly to the sliding block jointly, make the connecting piece comparatively stable when the workstation removes, drive the connecting piece when an output of cylinder removes and remove for it is comparatively convenient when the connecting piece drives the steel pipe and removes.

Optionally, the both ends of rotating the piece are all fixedly connected with straight board, and straight board threaded connection has the screw thread post, and the screw thread post is kept away from the one end fixedly connected with backup pad of straight board.

By adopting the technical scheme, the support plate provides support for the cold drawn steel tube before the cold drawn steel tube is clamped, so that the cold drawn steel tube is stable in the clamping process. The threaded column is in threaded connection with the straight plate, and then the supporting plate can be replaced, and the method is further suitable for cold drawn steel tubes with different sizes.

Optionally, an anti-slip layer is arranged on the inner wall of the clamping claw.

Through adopting above-mentioned technical scheme, skid resistant course and cold drawn steel tube laminating, and then increase the frictional force between clamping jaw and the cold drawn steel tube, be favorable to improving the connection stability between clamping jaw and the cold drawn steel tube.

Optionally, the workstation = has seted up the spout, is equipped with in the spout and removes the frame, removes frame up end fixedly connected with polisher, workstation fixedly connected with cylinder two, cylinder two output and remove frame fixed connection.

Through adopting above-mentioned technical scheme, cylinder two promotes the removal frame and removes to cold drawn steel tube welded part for the polisher polishes the welding slag of cold drawn steel tube welded part.

Optionally, the junction of rotating piece and connecting piece is equipped with a plurality of balls, and the ball inlays and locates in the connecting piece to with rotating piece roll connection.

Through adopting above-mentioned technical scheme, the ball reduces the frictional force between rotating member and the connecting piece for the rotation of connecting piece and rotating member is smoother.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the cold-rolled steel tube is placed between the first clamping plate and the second clamping plate, the motor drives the first gear to rotate positively, and the first gear drives the first rack and the second rack to rotate simultaneously, so that the first clamping plate and the second clamping plate are close to each other. The supporting arm promotes and presss from both sides tight claw and contradicts with cold rolled steel pipe, when the tight claw of clamp only has a contact point with cold bundle steel pipe, and the supporting arm continues to promote the tight claw removal, and then makes the tight claw of clamp continue to be close to and then its conflict to cold drawn steel pipe, and the tight claw of clamp is comparatively stable to the support location of cold drawn steel pipe this moment. After the two cold drawn steel pipes are clamped, the driving device pushes the two cold drawn steel pipes to approach each other through the connecting piece, and the rotating piece drives the cold drawn steel pipes to rotate;

2. the motor II drives the threaded rod I and the threaded rod II to rotate, so that the upper supporting arm and the lower supporting arm move synchronously, and the distance between the upper supporting arm and the lower supporting arm is controlled by the motor II, so that the first clamping plate and the second clamping plate can clamp cold drawn steel pipes with different diameters;

3. the support plate provides support for the cold drawn steel tube before the cold drawn steel tube is clamped, so that the cold drawn steel tube is stable in the clamping process. The threaded column is in threaded connection with the straight plate, and then the supporting plate can be replaced, and the method is further suitable for cold drawn steel tubes with different sizes.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a cold-rolled steel pipe butt welding machine.

Fig. 2 is a schematic view intended to highlight the structure of the connecting member and the rotating member.

Fig. 3 is a schematic view intended to highlight the first clamping plate and the second clamping plate structure.

Reference numerals illustrate: 1. a work table; 11. welding machine; 12. rectangular grooves; 13. a chute; 131. a moving rack; 132. a grinding machine; 14. a second cylinder; 121. a guide rod; 2. a clamping assembly; 21. a connecting piece; 211. a third motor; 212. a second gear; 213. a sliding block; 22. a rotating member; 221. a rectangular cavity; 222. a toothed ring; 223. tooth blocks; 224. a straight plate; 225. a threaded column; 226. a support plate; 227. a ball; 23. a first clamping plate; 231. a support arm; 2311. an upper support arm; 2312. a lower support arm; 232. a second motor; 2321. a first threaded rod; 2322. a second threaded rod; 233. clamping claws; 234. an anti-slip layer; 24. a second clamping plate; 25. a first motor; 26. a first gear; 27. a first rack; 28. a second rack; 3. a driving device; 31. and a first cylinder.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a cold-rolled steel pipe butt welding machine.

Referring to fig. 1 and 2, a cold-rolled steel pipe butt welding machine comprises a workbench 1, wherein the workbench 1 is made of stainless steel and has certain strength and hardness, a welding machine 11 is installed on the workbench 1, and two sets of clamping assemblies 2 and driving devices 3 corresponding to the clamping assemblies 2 are symmetrically distributed on two sides of the welding machine 11.

Referring to fig. 2 and 3, the clamping assembly 2 includes a connecting member 21, a rotating member 22, a first clamping plate 23, a second clamping plate 24, a first motor 25, a first gear 26, a first rack 27 and a second rack 28, the connecting member 21 is made of stainless steel, a sliding block 213 is fixed at the lower end of the connecting member, a rectangular slot 12 is formed in the workbench 1 along the length direction, and the sliding block 213 is inserted into the rectangular slot 12 and is slidably connected with the workbench 1.

Referring to fig. 1 and 2, a guide rod 121 is disposed in the rectangular groove 12 along the length direction, both ends of the guide rod 121 are fixedly connected with the table 1, and the guide rod 121 is inserted through and slidably connected with the slider 213. The rectangular groove 12 and the guide rod 121 limit the sliding block 213 together, the driving device 3 is a first cylinder 31, the first cylinder 31 is fixedly connected to one end of the workbench 1, the output end of the first cylinder 31 is fixedly connected with the connecting piece 21, the connecting piece 21 is driven to move along the rectangular groove 12 and the guide rod 121 when the output end of the first cylinder 31 moves, and an operator can control the connecting piece 21 to move conveniently through the first cylinder 31.

Referring to fig. 1 and 2, the rotating member 22 penetrates through the connecting member 21 and is rotatably connected with the connecting member 21, the rotating member 22 is provided with a toothed ring 222, the toothed ring 222 is located at one end of the rotating member 22 away from the welding machine 11, and a plurality of uniformly distributed toothed blocks 223 are fixedly connected to the toothed ring 222 along the circumferential direction. The motor III 211 is installed to connecting piece 21 upper end, and motor III 211 output shaft is fixed with gear II 212, and motor III 211 can drive the gear III and rotate, and gear III and tooth piece 223 all mesh, and the tooth ring 222 is rotated through tooth piece 223 when the gear III rotates for the operating personnel can drive the rotation piece 22 through operating motor III 211 and rotate.

Referring to fig. 1 and 2, a plurality of balls 227 are disposed between the rotating member 22 and the connecting member 21, all the balls 227 are embedded in the connecting member 21, and the balls 227 are in rolling connection with the rotating member 22, and when the connecting member 21 supports the rotating member 22 to rotate, the balls 227 reduce friction between the connecting member 21 and the rotating member 22, so that the rotating of the connecting member 21 and the rotating member 22 is smoother.

Referring to fig. 2 and 3, the rotating member 22 is opened with a rectangular cavity 221 in a length direction, and the first clamping plate 23 is slidably coupled in the rectangular cavity 221. The first clamping plate 23 is provided with two supporting arms 231, the two supporting arms 231 are arranged along the height direction, the first clamping plate 23 is provided with a vertical groove along the height direction, and the two supporting arms 231 are both connected in the vertical groove in a sliding manner. The support arm 231 at the upper end portion is an upper support arm 2311, and the support arm 231 at the lower end portion is a lower support arm 2312.

Referring to fig. 2 and 3, a second motor 232 is mounted at the upper end of the first clamping plate 23, a first threaded rod 2321 is fixed on an output shaft of the second motor 232, the first threaded rod 2321 is driven to rotate when the output shaft of the second motor 232 rotates, a second threaded rod 2322 is fixed at one end, facing away from the second motor 232, of the first threaded rod 2321, and the spiral direction of the second threaded rod 2322 is opposite to that of the first threaded rod 2321. When the first threaded rod 2321 rotates, the second threaded rod 2322 is driven to synchronously rotate.

Referring to fig. 2 and 3, a threaded rod 2321 is threaded through the upper support arm 2311 and is threadedly coupled to the upper support arm 2311, such that rotation of the threaded rod 2321 moves the upper support arm 2311 along the vertical slot. The second threaded rod 2322 penetrates through the lower support arm 2312 and is in threaded connection with the lower support arm 2312, the second threaded rod 2322 drives the lower support arm 2312 to move when rotating, and the upper support arm 2311 and the lower support arm 2312 synchronously move and move in opposite directions.

Referring to fig. 2 and 3, the ends of the upper support arm 2311 and the lower support arm 2312 facing away from the first clamping plate 23 are both rotatably connected with the clamping claw 233, and the upper support arm 2311 and the lower support arm 2312 move to drive the clamping claw 233 to move synchronously. The second clamping plate 24 is identical in structure and opposite to the first clamping plate 23 and is also slidably coupled within the rectangular cavity 221.

Referring to fig. 2 and 3, a first motor 25 is fixedly connected with the rotating member 22, a first gear 26 is fixed on an output shaft of the first motor 25, and an operator manipulates the first motor 25 to rotate the first gear 26. The first rack 27 is fixedly connected with the upper end part of the first clamping plate 23, the second rack 28 is fixedly connected with the upper end part of the second clamping plate 24, and the first rack 27 and the second rack 28 are meshed with the first gear 26 and are staggered with each other.

Referring to fig. 2 and 3, when the operator manipulates the first motor 25 to rotate the first gear 26, the first gear 26 drives the first clamping plate 23 and the second clamping plate 24 to approach or separate from each other through the first rack 27 and the second rack 28. The two ends of the rotating piece 22 are both provided with the straight plates 224, when the rotating piece 22 rotates, the straight plates 224 are driven to rotate, and in an initial state, the straight plates 224 are close to the workbench 1 and parallel to the upper end face of the workbench 1.

Referring to fig. 2 and 3, the upper end of the straight plate 224 is screw-coupled with a screw column 225, and the upper end of the screw column 225 is fixed with a support plate 226, and an operator places the cold drawn steel tube between the first clamping plate 23 and the second clamping plate 24. And supports the cold-plate steel tube by means of two support plates 226, while the cold-drawn steel tube is in a position intermediate the first clamping plate 23 and the second clamping plate 24. The operator can replace the support plate 226 by removing the threaded post 225 so that the support plate 226 is suitable for use with cold drawn steel tubes of different sizes.

Referring to fig. 2 and 3, the operator manipulates the first motor 25 to drive the first clamping plate 23 and the second clamping plate 24 to approach each other, so that the two upper supporting arms 231 and the two lower supporting arms 2312 at both sides of the cold drawn steel tube simultaneously drive the associated clamping jaw 233 to approach the cold drawn steel tube. When one end of the clamping claw 233 abuts against the cold rolled steel pipe, the other end of the clamping claw 233 continues to approach the cold drawn steel pipe and abut against the cold drawn steel pipe under the action of the reaction force of the cold rolled steel pipe.

Referring to fig. 2 and 3, after the clamping claw 233 has two contact points with the cold drawn steel tube, the clamping and positioning of the cold drawn steel tube is stable, so as to clamp the cold drawn steel tube, and the same rotating member 22 is provided with two groups of the first clamping plate 23 and the second clamping plate 24, which is beneficial to improving the clamping stability of the cold drawn steel tube.

Referring to fig. 2 and 3, the inner wall of the clamping jaw 233 is provided with an anti-slip layer 234, the anti-slip layer 234 is made of rubber, and has a large friction coefficient, when the clamping jaw 233 is abutted against the cold drawn steel tube, the anti-slip layer 234 is attached to the cold drawn steel tube, and the rubber layer is beneficial to increasing the friction force between the clamping jaw 233 and the cold drawn steel tube, so that the clamping stability of the clamping jaw 233 and the cold drawn steel tube is improved. And the operator can control the distance between the upper supporting arm 2311 and the lower supporting arm 2312 through the second motor 232, so that cold drawn steel pipes with different sizes can be clamped.

Referring to fig. 1 and 2, after the clamping and positioning of the cold drawn steel pipes are completed by the two groups of clamping assemblies 2, an operator manipulates the first two cylinders 31 to push the connecting pieces 21 to be close to each other, so that the two cold drawn steel pipes are mutually abutted, the welding machine 11 is operated to weld the two cold drawn steel pipes, and the second manipulating motor 232 is operated to drive the rotating pieces 22 to stably rotate during welding, so that stability of the cold drawn steel pipes during welding is improved.

Referring to fig. 1 and 2, a grinding machine 132 is mounted on the workbench 1, a chute 13 is formed in the workbench 1, the chute 13 is opposite to the welding machine 11, a movable frame 131 is connected in a sliding manner in the chute 13, the movable frame 131 is attached to the inner wall of the chute 13, and the grinding machine 132 is mounted on the upper end face of the movable frame 131. The workbench 1 is fixedly provided with a second cylinder 14, and the output end of the second cylinder 14 is fixed with the movable frame 131. After welding, an operator controls the second cylinder 14 to control the movable frame 131 to move, and then drives the grinding machine 132 to approach the cold drawn steel tube, welding slag is left at the joint of the cold drawn steel tube after welding, and the operator controls the grinding machine 132 to grind the welding slag.

The implementation principle of the cold-rolled steel pipe butt welding machine 11 in the embodiment of the application is as follows: the operator places two cold-rolled steel pipes in the rectangular cavities 221 of the two rotating members 22, respectively, so that they are each located between the first clamping plate 23 and the second clamping plate 24 in the respective rotating member 22. The first operating motor 25 drives the first gear 26 to rotate, and the first gear 26 drives the first rack 27 and the second rack 28 to synchronously move, so that the first clamping plate 23 and the second clamping plate 24 are close to each other. The upper supporting arm 2311 and the lower supporting arm 2312 both push the clamping claw 233 to approach the cold-rolled steel pipe, one end of the clamping claw 233 abuts against the cold-rolled steel pipe, and then the cold-drawn steel pipe supports the clamping claw 233 to rotate, so that the other end of the clamping claw 233 continues to approach the cold-drawn steel pipe and abuts against the cold-drawn steel pipe, and after all the clamping claws 233 abut against the cold-drawn steel pipe, the clamping and positioning of the cold-drawn steel pipe are stable. After the clamping and positioning of the cold drawn steel pipes are completed, the first operating cylinder 31 pushes the two cold drawn steel pipes to be close to each other, the joint of the cold drawn steel pipes is welded through the welding machine 11, and the second motor 232 drives the rotating piece 22 to rotate during welding, so that the joint of the cold drawn steel pipes is sufficiently welded, and the cold rolled steel pipes of the pipes rotate stably during welding.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (8)

1. The utility model provides a cold bundle steel pipe butt welding machine, includes workstation (1), and workstation (1) are equipped with welding machine (11), its characterized in that: the workbench (1) is provided with two sets of clamping assemblies (2) which are symmetrically arranged by taking a welding machine (11) as a center, each clamping assembly (2) comprises a connecting piece (21), a rotating piece (22), a first clamping plate (23), a second clamping plate (24), a first motor (25), a first gear (26), a first rack (27) and a second rack (28), the connecting piece (21) is in sliding connection with the workbench (1), the workbench (1) is provided with a driving device (3), the rotating piece (22) penetrates through the connecting piece (21) and is in rotating connection with the connecting piece, the rotating piece (22) is provided with a rectangular cavity (221), the first clamping plate (23) is in sliding connection with the rectangular cavity (221), the first clamping plate (23) is provided with two supporting arms (231) along the height direction, one end of each supporting arm (231) far away from the first clamping plate is in rotating connection with a clamping claw (233), the second clamping plate (24) is consistent with the first clamping plate (23) in structure and is also in sliding connection with the rectangular cavity (221), the first motor (25) is fixedly connected with the rotating piece (22), the first gear (26) is fixedly connected with the first rack (27) and the first rack (24) is fixedly connected with the second rack (28), the first racks (27) and the second racks (28) are arranged in a staggered mode, and the first racks (27) and the second racks (28) are meshed with the first gear (26).

2. A cold-rolled steel pipe butt welding machine as claimed in claim 1 wherein: among the two support arms (231), support arm (231) that is close to motor one (25) are established to support arm (2311), another support arm (231) are established to support arm (2312) down, vertical groove has been seted up to first clamping plate (23), upward support arm (2311) all wear to establish vertical groove and with first clamping plate (23) sliding connection with support arm (2312) down, first clamping plate (23) set firmly motor two (232), fixedly connected with threaded rod one (2321) of motor two (232) output shaft, threaded rod one (2321) wear to establish support arm (2311) and with its threaded connection, one point fixedly connected with screw thread opposite threaded rod two (2322) of motor two (232) are kept away from to threaded rod one (2321), lower support arm (2312) and with its threaded connection are worn to establish to threaded rod two (2322), second clamping plate (24) set up the same with first clamping plate (23).

3. A cold-rolled steel pipe butt welding machine as claimed in claim 1 wherein: the connecting piece (21) fixedly connected with motor three (211), motor three (211) output shaft is fixed can be connected with gear two (212), and the one end fixedly connected with ring gear (222) that rotor (22) deviate from welding machine (11), ring gear (222) are along circumference fixedly connected with tooth piece (223), and tooth piece (223) all meshes with gear two (212).

4. A cold-rolled steel pipe butt welding machine as claimed in claim 1 wherein: the driving device (3) is a first cylinder (31), the output end of the first cylinder (31) is fixedly connected with the connecting piece (21), the lower end part of the connecting piece (21) is fixedly connected with a sliding block (213), a rectangular groove (12) matched with the sliding block (213) is formed in the workbench (1), the sliding block (213) is slidably connected in the rectangular groove (12), a guide rod (121) is fixedly arranged on the inner wall of the rectangular groove (12), and the guide rod (121) penetrates through the sliding block (213) and is slidably connected with the sliding block.

5. A cold-rolled steel pipe butt welding machine as claimed in claim 1 wherein: both ends of rotating piece (22) all fixedly connected with straight board (224), straight board (224) threaded connection have screw thread post (225), and one end fixedly connected with backup pad (226) that straight board (224) were kept away from to screw thread post (225).

6. A cold-rolled steel pipe butt welding machine as claimed in claim 1 wherein: an anti-slip layer (234) is arranged on the inner wall of the clamping claw (233).

7. A cold-rolled steel pipe butt welding machine as claimed in claim 1 wherein: the workbench (1) is provided with a sliding groove (13), a movable frame (131) is arranged in the sliding groove (13), a grinding machine (132) is fixedly connected to the upper end face of the movable frame (131), the workbench (1) is fixedly connected with a second air cylinder (14), and the output end of the second air cylinder (14) is fixedly connected with the movable frame (131).

8. A cold-rolled steel pipe butt welding machine as claimed in claim 1 wherein: the connecting part of the rotating piece (22) and the connecting piece (21) is provided with a plurality of balls (227), and the balls (227) are embedded in the connecting piece (21) and are in rolling connection with the rotating piece (22).