A butt joint tool for pipe and tube welding

Abstract

The application provides a butt joint tool for pipe fitting and pipeline welding, and relates to the technical field of pipeline welding.The butt joint tool comprises a supporting mechanism, a mounting disc and a clamping and positioning mechanism.The supporting mechanism comprises a clamping pipe hoop and two supporting rods.The mounting disc comprises an outer disc arranged at the end of the supporting rod and an inner disc rotating on the outer disc.The clamping and positioning mechanism comprises a mounting rod, a positioning disc and a abutting assembly.The mounting rod is fixed on the inner disc.The positioning disc is detachably arranged on the mounting rod.The abutting assembly is arranged on the side of the positioning disc facing the pipeline.The abutting assembly comprises an abutting disc, a limiting screw rod and a plurality of abutting rods.The plurality of abutting rods are all bent rods and are distributed in the circumferential direction on the abutting disc.A flexible abutting block is arranged on the abutting rod.The limiting screw rod is fixed on the abutting disc and extends to the outside of the positioning disc at the end.The end of the limiting screw rod outside the positioning disc is threadedly connected with a limiting nut.The application can conveniently align the pipe fitting and the pipeline and keep the position of the pipe fitting, thereby reducing the operation difficulty in the welding process and ensuring the welding quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline welding, in particular to a butt joint tool for pipe fitting and pipeline welding. BACKGROUND

[0002] The pipeline is widely used in water supply and drainage, heat supply, coal gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering and various industrial devices; according to different application scenarios, the installation mode of the pipeline is also various, mainly including overhead installation, buried laying, suspension installation and the like. The pipe fitting is a general term of parts in a pipeline system, which plays a role of connection, control, direction change, flow distribution, sealing and support, and the welding of the pipe fitting and the pipeline is a key link in the installation of the pipeline system, and the quality directly affects the safety, sealing and service life of the pipeline. Common pipe fittings mainly include elbows, tees and pipe joints.

[0003] When the pipe fitting needs to be welded to the pipeline, the worker needs to align one end of the pipe fitting with the pipeline and abut tightly, and then weld. For the overhead installation or suspension installation mode, the worker has a large operation difficulty, and the position of the pipe fitting is easy to deviate, so it is difficult to ensure the installation quality. SUMMARY

[0004] The purpose of the present application is to provide a butt joint tool for pipe fitting and pipeline welding, which can conveniently align the pipe fitting and the pipeline and keep the position of the pipe fitting, thereby reducing the operation difficulty in the welding process and ensuring the welding quality.

[0005] The present application is implemented by the following technical scheme: a butt joint tool for pipe fitting and pipeline welding, comprising:

[0006] A supporting mechanism, the supporting mechanism comprises a clamping pipe hoop and two supporting rods, the clamping pipe hoop comprises an upper pipe hoop and a lower pipe hoop, and the two supporting rods are connected on both sides of the upper pipe hoop;

[0007] A mounting disc, the mounting disc comprises an outer disc and an inner disc, the outer disc is fixedly arranged at one end of the supporting rod away from the clamping pipe hoop and is coaxial with the clamping pipe hoop, and the inner disc is rotatably arranged in the outer disc;

[0008] A clamping and positioning mechanism, the clamping and positioning mechanism comprises a mounting rod, a positioning disc and an abutting assembly, the mounting rod is fixedly arranged on the inner disc, the positioning disc is detachably arranged on the mounting rod, and the abutting assembly is arranged on one side of the positioning disc facing the pipeline; when the positioning disc is mounted to the mounting rod, one end of the pipe fitting abuts on the positioning disc, and the other end is in a concentric state with the pipeline;

[0009] The abutting assembly comprises an abutting disc, a limiting screw rod and a plurality of abutting rods, the plurality of abutting rods are all bent rods and are distributed in the circumferential direction on the abutting disc, one end of the limiting screw rod is fixedly arranged on the abutting disc, the other end of the limiting screw rod penetrates through the positioning disc and extends out of the positioning disc, the end of the limiting screw rod outside the positioning disc is threadedly connected with a limiting nut, and the side of the abutting rod away from the limiting screw rod is provided with a flexible abutting block.

[0010] Further, the abutting rod comprises two mutually hinged support rods, one of the support rods is rotationally connected to the abutting disc, and the other support rod is rotationally connected to the positioning disc, and the flexible abutting block is fixedly arranged on one of the support rods.

[0011] Further, one side of the positioning disc is provided with a connecting block, the mounting rod is provided with a connecting seat, the connecting seat is provided with a slot for inserting the connecting block, the connecting block is threadedly connected with a positioning bolt, the connecting seat is provided with a through hole for the positioning bolt to penetrate through, and the through hole is in communication with the slot.

[0012] Further, the support rod comprises a connecting section, a first horizontal section, an arc-shaped section and a second horizontal section, both sides of the upper pipe clamp are provided with connecting ears, the connecting section is fixedly arranged on the connecting ears, the first horizontal section is arranged at the bottom of the connecting section and is in abutment with the pipeline support, the arc-shaped section is arranged at one end of the first horizontal section away from the connecting section and extends downwardly and obliquely, and the second horizontal section is arranged at one end of the arc-shaped section away from the first horizontal section.

[0013] Further, the second horizontal section comprises an outer rod body and an inner rod body, the inner rod body is slidingly arranged in the outer rod body, and a telescopic adjusting assembly for driving the inner rod bodies on both sides to simultaneously move towards or away from the outer rod body is arranged between the two support rods.

[0014] Further, the telescopic adjusting assembly comprises a first support and a second support, the two ends of the first support are respectively connected between the outer rod bodies on both sides, the two ends of the second support are respectively connected between the inner rod bodies on both sides, and a contraction member and an extension member are connected between the first support and the second support.

[0015] Further, the extension member comprises a hinged block, the hinged block is rotationally arranged at the middle part of the first support and can drive the second support to move away from the first support, the first support is further provided with a pressing piece for keeping the hinged block in a horizontal state, and the contraction member comprises a plurality of tension springs arranged on both sides of the hinged block, one end of the tension spring is fixedly connected to the first support, and the other end of the tension spring is connected to the second support.

[0016] Further, the center position of the inner disc is provided with a center positioning member, the center positioning member comprises a center column and a center seat, the center column is slidingly arranged on the inner disc, the center seat is rotationally arranged on one end of the center column towards the pipe clamp, and a threaded hole matched with the limiting screw rod is formed in the center seat.

[0017] Further, the center seat is a magnetic seat capable of being attracted to the inner disc.

[0018] Further, the mounting rod is provided with a rotation-stopping pin, and the outer disc is circumferentially distributed with a plurality of pin holes for inserting the rotation-stopping pin.

[0019] The technical scheme of the present application has at least the following advantages and beneficial effects:

[0020] 1. The pipe clamp and the pipe are connected by clamping, the pipe fitting such as the elbow or the tee is installed by the positioning disc and the abutting assembly, after installation, the positioning disc is connected to the mounting rod, so that one end of the pipe fitting abuts on the positioning disc, and the other end is in a concentric state with the pipe, and by changing the length of the supporting rod, the pipe fitting can be moved towards the pipe and abut on the end of the pipe, facilitating the welding process of the pipe fitting and the pipe.

[0021] 2. The limiting screw rod is moved outwardly from the abutting disc by tightening the limiting nut, the limiting screw rod can drive the abutting disc to move synchronously, and when the plurality of abutting rods are bent to a specified state, the flexible abutting block abuts on the inner wall of the pipe fitting to realize the positioning effect of the pipe fitting; the bending rod is bent to different states, so that it can be suitable for different pipe diameters within a certain range, and can also be used for abutting on the variable-diameter elbow or the variable-diameter tee. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of the use state of the present application;

[0023] Figure 2 It is a structure schematic view of the overall structure of the present application;

[0024] Figure 3 It is a structure schematic view of the supporting mechanism of the present application;

[0025] Figure 4 It is a structure schematic view of the second horizontal section and the telescopic adjusting assembly of the present application;

[0026] Figure 5 It is a structure schematic view of the telescopic adjusting assembly of the present application;

[0027] Figure 6 It is a connection structure schematic view of the positioning disc and the mounting rod of the present application;

[0028] Figure 7 It is a structure schematic view of the abutting assembly and the positioning disc of the present application;

[0029] Figure 8 This is a schematic diagram of the structure when the positioning disk of the present invention is installed on the central positioning component;

[0030] Reference numerals: 1-Support mechanism, 11-Clamping clamp, 111-Upper clamp, 112-Lower clamp, 113-Connecting lug, 12-Support rod, 121-Connecting section, 122-First horizontal section, 123-Arc-shaped section, 124-Second horizontal section, 1241-Outer rod, 1242-Inner rod, 13-Telescopic adjustment assembly, 131-First support, 132-Second support, 133-Retractable component, 1331-Tension spring, 134-Extending component, 1341-Hinge block, 1342-Pressure. 1343-Pulley, 2-Mounting plate, 21-Outer plate, 22-Inner plate, 3-Clamping and positioning mechanism, 31-Mounting rod, 311-Connecting seat, 312-Anti-rotation pin, 32-Positioning plate, 321-Connecting block, 322-Positioning bolt, 33-Clamping assembly, 331-Clamping plate, 332-Limit screw, 333-Clamping rod, 3331-Support rod, 334-Limit nut, 335-Flexible clamping block, 4-Center positioning component, 41-Center column, 42-Center seat, 421-Threaded hole. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] Example

[0034] The following is for reference Figures 1-7As shown, further illustrated in conjunction with the specific embodiments, the embodiment provides a butt joint tool for pipe and pipe welding, comprising a supporting mechanism 1, a mounting disc 2 and a clamping and positioning mechanism 3, the supporting mechanism 1 comprises a clamping pipe clamp 11 and two supporting rods 12, the clamping pipe clamp 11 comprises an upper pipe clamp 111 and a lower pipe clamp 112, and the two supporting rods 12 are connected to the two sides of the upper pipe clamp 111 respectively; the mounting disc 2 comprises an outer disc 21 and an inner disc 22, the outer disc 21 is fixed at the end of the supporting rod 12 away from the clamping pipe clamp 11 and is coaxial with the clamping pipe clamp 11, and the inner disc 22 is rotationally arranged in the outer disc 21; the clamping and positioning mechanism 3 comprises a mounting rod 31, a positioning disc 32 and a abutting assembly 33, the mounting rod 31 is fixedly arranged on the inner disc 22, the positioning disc 32 is detachably arranged on the mounting rod 31, and the abutting assembly 33 is arranged on the side of the positioning disc 32 facing the pipe. When installing the pipe fittings such as elbows or tees, the end of the elbow or tee away from the pipe is abutted on the positioning disc 32 on the ground, then the elbow is abutted by the abutting assembly 33 to realize the positioning function, and then the positioning disc 32 with the elbow or tee is installed on the mounting rod 31, so that the end of the elbow or tee to be welded is in a concentric state with the end of the pipe, facilitating the welding process.

[0035] Referring to Figure 2 , Figure 3 As shown, the supporting rod 12 comprises a connecting segment 121, a first horizontal segment 122, an arc segment 123 and a second horizontal segment 124, the two sides of the upper pipe clamp 111 are provided with connecting ears 113, the connecting segment 121 is welded on the connecting ears 113, the first horizontal segment 122 is arranged at the bottom of the connecting segment 121 and is in close contact with the pipe support, the arc segment 123 is arranged at the end of the first horizontal segment 122 away from the connecting segment 121 and extends downwardly and obliquely, and the second horizontal segment 124 is arranged at the end of the arc segment 123 away from the first horizontal segment 122. By making the first horizontal segment 122 in close contact with the pipe support, part of the weight is shared to the pipe support, so as to reduce the load of the clamping pipe clamp 11 and improve the reliability of the overall structure; since the pipe is lapped on the pipe support and the pipe fitting is aligned with the pipe at about the same height, the height of the second horizontal segment 124 is reduced by extending the arc segment 123 downwardly and connecting the second horizontal segment 124 to the bottom end of the arc segment 123, so as to avoid the second horizontal segment 124 from hindering the pipe fitting.

[0036] Referring to Figure 3 , Figure 4As shown, the second horizontal section 124 comprises an outer rod body 1241 and an inner rod body 1242, the inner rod body 1242 is slidingly arranged in the outer rod body 1241, and a telescopic adjusting assembly 13 is arranged between the two support rods 12 and used to drive the inner rod bodies 1242 on both sides to move towards or away from the outer rod body 1241 simultaneously. During the installation of the pipe fitting, the inner rod body 1242 is moved outwards relative to the outer rod body 1241 by the telescopic adjusting assembly 13 to reserve sufficient installation space; after the pipe fitting is installed to the clamping and positioning mechanism 3, the inner rod body 1242 is moved inwards relative to the outer rod body 1241 by the telescopic adjusting assembly 13 to move the installation disc 2 and the clamping and positioning mechanism 3 towards the pipe simultaneously, so that the end of the pipe fitting and the end of the pipe are in abutting state to facilitate welding.

[0037] With reference to Figure 5 As shown, the telescopic adjusting assembly 13 comprises a first support 131 and a second support 132, the two ends of the first support 131 are connected between the outer rod bodies 1241 on both sides respectively, the two ends of the second support 132 are connected between the inner rod bodies 1242 on both sides respectively, and a contraction piece 133 and an extension piece 134 are connected between the first support 131 and the second support 132. The extension piece 134 comprises a hinged block 1341, the hinged block 1341 is rotatably installed at the middle part of the first support 131 and can drive the second support 132 to move away from the first support 131, and a pressing piece 1342 is further arranged on the first support 131 and used to keep the hinged block 1341 in a horizontal state; the contraction piece 133 comprises a plurality of tension springs 1331 arranged on both sides of the hinged block 1341, one end of each tension spring 1331 is fixedly connected to the first support 131, and the other end is connected to the second support 132. By rotating the hinged block 1341 to a horizontal state and keeping the position of the hinged block 1341 by the pressing piece 1342, the end of the hinged block 1341 can keep the second support 132 away from the first support 131; by detaching the pressing piece 1342 from the hinged block 1341 and rotating the hinged block 1341 upwards, the second support 132 can be pulled towards the first support 131 under the elastic force of the plurality of tension springs 1331. A notch is formed in the middle part of the first support 131, the hinged block 1341 is rotatable in the notch, and the hinged block 1341 is in abutting connection with the bottom wall of the notch when the hinged block 1341 is rotated to a horizontal state; a sliding groove is formed in the first support 131 and located on one side of the notch, the pressing piece 1342 is slidingly connected in the sliding groove, a top part of the pressing piece 1342 is provided with a poking block 1343, a top part of the sliding groove is provided with a strip-shaped slot for the poking block 1343 to slide, and the poking block 1343 can be used to conveniently poke the pressing piece 1342, so as to conveniently press and release the hinged block 1341.

[0038] With reference to Figure 2 , Figure 6As shown, one side of the positioning disc 32 is provided with a connecting block 321, the mounting rod 31 is provided with a connecting seat 311, the connecting seat 311 is provided with a slot for inserting the connecting block 321, the connecting block 321 is threadedly connected with a positioning bolt 322, the connecting seat 311 is provided with a through hole for the positioning bolt 322 to pass through, and the through hole is communicated with the slot. When installing the pipe fitting to the clamping and positioning mechanism 3, the positioning disc 32 is removed from the mounting rod 31, the worker can more conveniently install the pipe fitting to the positioning disc 32 and abut against the abutting assembly 33 on the ground, then the connecting block 321 of the positioning disc 32 is inserted into the slot of the connecting seat 311, and the connecting block 321 is fixed by the positioning bolt 322; when the positioning disc 32 needs to be removed from the pipe fitting after welding, the positioning bolt 322 is loosened, the moving clamping and positioning mechanism 3 is driven by the telescopic adjusting assembly 13 to move in the direction away from the pipe, and then the abutting assembly 33 is loosened from the pipe fitting, so that the positioning disc 32 and the abutting piece can be removed.

[0039] Referring to Figure 2 , Figure 6 As shown, the mounting rod 31 is provided with a rotation-stopping pin 312, and the outer disc 21 is provided with a plurality of pin holes for inserting the rotation-stopping pin 312 in the circumferential direction. The pin hole is provided with at least four pin holes. When the pipe extends in different directions up, down, left and right, the relative position of the inner disc 22 and the outer disc 21 can be changed by inserting the rotation-stopping pin 312 into the pin holes in different positions, so as to adapt to the installation of the pipe fitting in different directions.

[0040] Referring to Figure 6 , Figure 7 As shown, the abutting assembly 33 comprises an abutting disc 331, a limiting screw 332 and a plurality of abutting rods 333. The abutting rods 333 are all bent rods and are distributed on the abutting disc 331 in the circumferential direction. One end of the limiting screw 332 is fixedly arranged on the abutting disc 331, and the other end extends out of the positioning disc 32. The end of the limiting screw 332 outside the positioning disc 32 is threadedly connected with a limiting nut 334, and the abutting rod 333 is provided with a flexible abutting block 335 on the side away from the limiting screw 332. The end of the elbow or tee pipe fitting away from the pipe is attached to the abutting disc 331, and then the limiting nut 334 is tightened to move the limiting screw 332 out of the abutting disc 331. The limiting screw 332 can drive the abutting disc 331 to move synchronously and bend the plurality of abutting rods 333 at the same time. When the abutting rod 333 is bent to the specified position, the flexible abutting block 335 can abut against the inner wall of the pipe fitting, thereby realizing the positioning effect of the pipe fitting. By changing the position of the limiting screw 332, the bent rod can be bent to different states, thereby being suitable for different pipe diameters within a certain range, and the abutting can also be performed on the variable-diameter elbow or variable-diameter tee.

[0041] Referring to Figure 7As shown, the clamping rod 333 includes two hinged support rods 3331, one of which is rotatably connected to the clamping plate 331, and the other is rotatably connected to the positioning plate 32. The flexible clamping block 335 is fixedly mounted on one of the support rods 3331. Both support rods 3331 are made of rigid material and will not bend. When the limiting screw 332 moves the clamping plate 331, the angle between the two support rods 3331 can change, thereby causing the position of the flexible clamping block 335 to change, so as to clamp against the inner wall of the pipe and achieve the positioning function of the pipe.

[0042] Reference Figure 2 , Figure 8 As shown, a center positioning component 4 is provided at the center of the inner disk 22. The center positioning component 4 includes a center column 41 and a center seat 42. The center column 41 is slidably mounted on the inner disk 22, and the center seat 42 is rotatably mounted at the end of the center column 41 facing the pipe clamp. The center seat 42 has a threaded hole 421 that mates with the limiting screw 332. For pipe fittings such as reducing joints and pipe plugs that are concentric with the pipeline, after the pipe fitting is installed on the mounting base and positioned by the clamping component 33, the limiting screw 332 of the clamping component 33 is connected to the center positioning component 4 to keep the pipe fitting and the pipeline in a concentric state. During installation, keeping the position of the mounting base unchanged, rotating the center seat 42 will cause the limiting screw 332 to be threaded into the threaded hole 421, thereby fixing the position of the clamping component 33. The center seat 42 is a magnetic seat that can be attracted to the inner plate 22. When the center positioning component 4 is not used, the center column 41 is pulled away from the pipe, so that the center seat 42 moves to abut against the inner plate 22 and is attracted to the inner plate 22, thus making it easy to store the center positioning component 4.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pipe and tube welding butt joint tool characterized by, The utility model relates to a kind of pipe fitting clamp and positioning device, including: Support mechanism (1), the support mechanism (1) includes clamping pipe collar (11) and two support rods (12), the clamping pipe collar (11) includes upper pipe collar (111) and lower pipe collar (112), two the support rod (12) is connected in the two sides of upper pipe collar (111) respectively; Mounting disc (2), the mounting disc (2) includes outer disc (21) and inner disc (22), the outer disc (21) is fixedly arranged at the end of support rod (12) away from clamping pipe collar (11) and is coaxial with clamping pipe collar (11), the inner disc (22) is rotationally arranged in outer disc (21); Clamping positioning mechanism (3), the clamping positioning mechanism (3) includes mounting rod (31), positioning disc (32) and abutting assembly (33), the mounting rod (31) is fixedly arranged on inner disc (22), the positioning disc (32) is detachably arranged on mounting rod (31), the abutting assembly (33) is arranged on the side of positioning disc (32) towards pipeline;When the positioning disc (32) is mounted to mounting rod (31), one end of pipe fitting is abutted on positioning disc (32), and the other end is in concentric state with pipeline; Wherein, the abutting assembly (33) includes abutting disc (331), limiting screw (332) and multiple abutting rods (333), multiple the abutting rod (333) is all bent rod and is distributed circumferentially on abutting disc (331), one end of the limiting screw (332) is fixedly arranged on abutting disc (331), the other end passes through positioning disc (32) and extends to the outside of positioning disc (32), the end of limiting screw (332) located outside positioning disc (32) is threadedly connected with limiting nut (334), the side of abutting rod (333) away from limiting screw (332) is provided with flexible abutting block (335).

2. The pipe welding butt-joint tool according to claim 1, wherein The abutting rod (333) includes two mutually hinged support rods (3331), one of the support rod (3331) is rotationally connected to abutting disc (331), the other support rod (3331) is rotationally connected to positioning disc (32), and the flexible abutting block (335) is fixedly arranged on one of the support rods (3331).

3. The pipe welding butt-joint tool according to claim 1, wherein One side of the positioning disc (32) is provided with a connecting block (321), the mounting rod (31) is provided with a connecting seat (311), the connecting seat (311) is provided with a slot for inserting the connecting block (321), the connecting block (321) is threadedly connected with a positioning bolt (322), the connecting seat (311) is provided with a through hole for the positioning bolt (322) to pass through, and the through hole is communicated with the slot.

4. The pipe welding butt-joint tool according to claim 1, wherein The support rod (12) comprises a connecting section (121), a first horizontal section (122), an arc-shaped section (123) and a second horizontal section (124), both sides of the upper pipe clamp (111) are provided with connecting ears (113), the connecting section (121) is fixedly arranged on the connecting ears (113), the first horizontal section (122) is arranged at the bottom of the connecting section (121) and is attached to the pipe support, the arc-shaped section (123) is arranged at one end of the first horizontal section (122) away from the connecting section (121) and extends downwardly and obliquely, and the second horizontal section (124) is arranged at one end of the arc-shaped section (123) away from the first horizontal section (122).

5. The pipe welding butt-joint tool according to claim 4, wherein The second horizontal section (124) comprises an outer rod body (1241) and an inner rod body (1242), the inner rod body (1242) is slidingly arranged in the outer rod body (1241), and a telescopic adjusting assembly (13) for driving the inner rod bodies (1242) on both sides to move towards or away from the outer rod body (1241) at the same time is arranged between the two support rods (12).

6. The pipe welding butt-joint tool according to claim 5, wherein The telescopic adjusting assembly (13) comprises a first support (131) and a second support (132), both ends of the first support (131) are connected between the outer rod bodies (1241) on both sides, both ends of the second support (132) are connected between the inner rod bodies (1242) on both sides, and a contraction piece (133) and an extension piece (134) are connected between the first support (131) and the second support (132).

7. The pipe welding butt-joint tool according to claim 6, wherein The extension piece (134) comprises a hinged block (1341) which is rotatably arranged at the middle of the first support (131) and can drive the second support (132) to move away from the first support (131), and a pressing piece (1342) for keeping the hinged block (1341) in a horizontal state is further arranged on the first support (131); the contraction piece (133) comprises a plurality of tension springs (1331) arranged on both sides of the hinged block (1341), one end of the tension spring (1331) is fixedly connected to the first support (131), and the other end is connected to the second support (132).

8. The pipe welding butt-joint tool according to claim 1, wherein A center positioning piece (4) is arranged at the center position of the inner disc (22), the center positioning piece (4) comprises a center column (41) and a center seat (42), the center column (41) is slidingly arranged on the inner disc (22), and the center seat (42) is rotatably arranged at one end of the center column (41) facing the pipe clamp, and a threaded hole (421) matched with the limiting screw rod (332) is formed in the center seat (42).

9. The pipe welding butt-joint tool according to claim 8, wherein The center seat (42) is a magnetic seat capable of being attracted to the inner disc (22).

10. The pipe welding butt-joint tool according to claim 1, wherein A rotation-stopping pin (312) is arranged on the mounting rod (31), and a plurality of pin holes for inserting the rotation-stopping pin (312) are distributed in the circumference of the outer disc (21).

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