Pipeline welding alignment clamp

Abstract

The utility model discloses a pipeline welding alignment fixture which comprises a hoop body, a coaxiality measuring piece and two clamping assemblies, the two clamping assemblies are arranged at the two ends of the hoop body respectively, the coaxiality measuring piece is arranged on the hoop body, the butt joint position of two pipelines penetrates through the hoop body, and the coaxiality measuring piece is arranged on the hoop body. The two clamping assemblies are arranged on the hoop body, the two clamping assemblies correspond to the two pipelines in a one-to-one mode, the two clamping assemblies are used for clamping the corresponding pipelines respectively, and the coaxiality measuring piece is used for measuring the coaxiality when the two pipelines are in butt joint, so that after the two pipelines are in preliminary butt joint, the hoop body is connected to the butt joint position of the two pipelines in a hooping mode, and the coaxiality measuring piece is used for measuring the coaxiality when the two pipelines are in butt joint. The two clamping assemblies clamp the ends, close to each other, of the two pipelines respectively, the coaxiality of the two pipelines is measured through the coaxiality measuring piece, and if the coaxiality is not good, the coaxiality of the two pipelines continues to be adjusted through the two clamping assemblies till the measuring result of the coaxiality measuring piece meets the requirement.

Description

Technical Field

[0001] The utility model belongs to the field of pipe clamps, and particularly relates to a pipe welding alignment clamp. Background Art

[0002] Pipe welding alignment clamps are used to ensure the accuracy and stability of pipe docking during the pipe welding process. Such clamps usually have the functions of fixing and positioning pipes for precise welding operations. Using pipe welding alignment clamps can improve welding quality and efficiency and reduce the manual adjustment and correction time of workers. For existing pipe welding alignment clamps, it is usually necessary to adjust multiple positioning screws to press against the inner pipe to achieve the horizontal alignment of the butting interfaces of the two pipes, laying a foundation for subsequent welding operations. However, during this adjustment and alignment process, judging whether the two pipes are horizontal usually depends on manual operations, such as using a ruler to abut and detect the pipe surface. This method is not only cumbersome but also has certain errors. When the ruler is tilted and does not fully fit the surfaces of the two pipes, it indicates that the pipe alignment has not been successful. Even more, in some projects, the staff directly judges whether the pipes meet the welding standards by the naked eye. The accuracy and reliability of this method are even more questionable. Moreover, during the process of adjusting the positioning screws, it is necessary to manually use a ruler for detection frequently, which not only affects the convenience of pipe alignment but also reduces the practicality of the alignment clamp. Summary of the Utility Model

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a pipe welding alignment clamp with a simple structure that can conveniently align two butt-jointed pipes and perform coaxiality calibration.

[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows: A pipe welding alignment clamp includes a hoop body, a coaxiality measuring member, and two groups of clamping components. The two groups of clamping components are respectively arranged at both ends of the hoop body, the coaxiality measuring member is arranged on the hoop body, the butting part of two pipes passes through the inside of the hoop body, and the two groups of clamping components correspond to the two pipes one by one. The two groups of clamping components are respectively used to clamp the corresponding pipes, and the coaxiality measuring member is used to measure the coaxiality of the two pipes when butting.

[0005] The beneficial effect of the above technical solution is as follows: In this way, after the two pipes are initially butted, the hoop body can be buckled on the butting part of the two pipes, the two groups of clamping components clamp the mutually close ends of the two pipes respectively, and the coaxiality measuring member is used to measure the coaxiality of the two pipes. If the coaxiality is not good, continue to adjust the coaxiality of the two pipes through the two groups of clamping components until the measurement result of the coaxiality measuring member meets the requirements.

[0006] In the above technical solution, the clamping assembly includes a plurality of clamping bolts. At both ends of the hoop body, a plurality of radially distributed screw holes are arranged at equal intervals circumferentially, and the plurality of screw holes at the same end correspond one by one to the plurality of clamping bolts in the corresponding clamping assembly. The plurality of clamping bolts are distributed at equal intervals circumferentially at the corresponding end of the hoop body. Each clamping bolt is threadedly connected to the corresponding screw hole, and the threaded end of the clamping bolt faces the inside of the hoop body. The plurality of clamping bolts in the same group are used to circumferentially clamp the docking end of the corresponding pipeline.

[0007] The beneficial effect of the above technical solution is that its structure is simple. In this way, a plurality of clamping bolts can clamp a pipeline circumferentially, and by adjusting the feed amount of the plurality of clamping bolts relative to the hoop body, the axial position of the pipeline can be adjusted inside the hoop body.

[0008] In the above technical solution, each group of the clamping assemblies is provided with 3-5 clamping bolts, and a wear-resistant head is arranged at the threaded end of the clamping bolt.

[0009] The beneficial effect of the above technical solution is that 3-5 clamping bolts can meet the clamping requirements of the pipeline. In addition, a wear-resistant head is arranged at the threaded end of the clamping bolt, so that the durability of the clamping bolt is good.

[0010] In the above technical solution, the coaxiality measuring member includes two groups of distance measuring probe groups, and each group of the distance measuring probe groups is provided with at least two distance measuring probes. The two groups of distance measuring probe groups are respectively arranged at both ends of the hoop body, and the plurality of distance measuring probes in the same group are distributed at equal intervals circumferentially at the corresponding end of the hoop body and are distributed in the same circle, and the circle where they are located is coaxially distributed with the hoop body, and the detection part of each distance measuring probe faces the corresponding pipeline along the radial direction of the hoop body.

[0011] The beneficial effect of the above technical solution is that in this way, the coaxiality of the corresponding pipeline relative to the hoop body can be adjusted through the cooperation of the distance measuring probe group and the corresponding clamping assembly, so as to adjust the coaxiality of the relative distribution of the two pipelines.

[0012] In the above technical solution, each group of the distance measuring probe groups has two distance measuring probes, and the central angle corresponding to the two distance measuring probes in the same group on the hoop body is a right angle or an acute angle.

[0013] The beneficial effect of the above technical solution is that its structure is simple, and the coaxiality of the corresponding pipeline relative to the hoop body can be preliminarily adjusted through two distance measuring probes.

[0014] In the above technical solution, the coaxiality measuring member includes a calibration strip and two telescopic adjusting members. The telescopic length of the telescopic adjusting member is measurable. The two telescopic adjusting members are respectively installed at both ends of the hoop body and are distributed oppositely at both ends of the hoop body. The telescopic end of each telescopic adjusting member faces the inside of the hoop along the radial direction of the hoop body. The calibration strip is arranged inside the hoop body, and both ends thereof are swing-connected to the telescopic ends of the two telescopic adjusting members respectively.

[0015] The beneficial effect of the above technical solution is as follows: After the two pipe clamping components clamp the butt ends of the two pipes and initially adjust the coaxiality of the two pipes, the two telescopic adjusting members can be adjusted at this time until the calibration strip abuts against the outer walls of the butt ends of the two pipes. Then, by measuring the telescopic lengths of the two telescopic adjusting members, if the two telescopic lengths are the same or close, it can be considered that the coaxiality of the two pipes is good; otherwise, the coaxiality of the two pipes needs to be continuously adjusted through the two pipe clamping components.

[0016] In the above technical solution, the telescopic adjusting member includes a movable block, a lead screw, a mounting seat, a guide rod, a knob, and a straight scale. The mounting seat is installed at the corresponding end of the hoop body. A threaded hole and a guide sliding hole penetrating along the radial direction of the hoop body are provided on the mounting seat. The lead screw is engaged with the threaded hole and is threadedly connected to the mounting seat. The guide rod slides through the guide sliding hole. The movable block is installed at one end of the guide rod inside the hoop body. The movable block is rotationally connected to one end of the lead screw inside the hoop body. The knob is fixedly installed at the other end of the lead screw. The straight scale is installed beside the mounting seat and the movable block, and is fixedly connected to the mounting seat and is parallel to the guide rod. The straight scale is used to measure the distance between the movable block and the mounting seat.

[0017] The beneficial effect of the above technical solution is as follows: In this way, each elongation adjusting member is a manually driven lead screw member, and the straight scale provided on the elongation adjusting member can directly measure the distance between the movable block and the mounting seat, which is convenient to use.

[0018] In the above technical solution, the hoop body includes a locking member and two semi-circular hoop plates. The arc openings of the two hoop plates are aligned with each other, and one end of the two hoop plates is rotationally connected. The two hoop plates can be swung to be closed or unfolded, and when the two hoop plates are rotated to be closed, they are connected by the locking member.

[0019] The beneficial effect of the above technical solution is as follows: Its structure is simple, and the hoop body cooperates with the two pipe clamping components to have a good clamping effect on the pipe.

[0020] In the above technical solution, the locking member includes a telescopic member and an N-shaped turning plate. Connecting plates are arranged on the outer sides of the two hoop plates away from the ends where they are rotatably connected. When the two hoop plates are swung to be closed, the two connecting plates are attached to each other. The notch side of the turning plate is rotatably connected to both sides of one of the connecting plates. The telescopic member is vertically installed on the other turning plate, and its telescopic end faces away from the other hoop plate. A cylinder is vertically arranged on the inner bottom wall of the turning plate. When the two hoop plates are swung to be closed and the turning plate is swung so that the cylinder is aligned with the telescopic end of the telescopic member, the telescopic member extends until its telescopic end is inserted into the cylinder to lock the two hoop plates, or the telescopic member contracts to unlock the two hoop plates.

[0021] The beneficial effect of the above technical solution is that its structure is simple, and when the two hoop plates are swung to be closed, the telescopic member can be conveniently used in cooperation with the turning plate to lock or unlock.

[0022] In the above technical solution, the hoop plate includes two arc-shaped rods and multiple connecting rods. The arc-shaped rods are both semi-circular. The two arc-shaped rods are parallel to each other and spaced apart. Multiple connecting rods are horizontally arranged between the two arc-shaped rods and are spaced along the length direction of the arc-shaped rods. The two ends of each connecting rod are connected to the two arc-shaped rods. The two ends of the two arc-shaped rods form the two ends of the hoop plate.

[0023] The beneficial effect of the above technical solution is that in this way, the entire hoop plate is a hollow structure, so that it can be conveniently observed whether the clamping assembly clamps the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The front view of the pipeline welding alignment fixture of Embodiment 1 of the present utility model when clamping two pipelines;

[0025] Figure 2 The front view of the coaxiality measuring member in Embodiment 1 of the present utility model;

[0026] Figure 3 The structural schematic diagram of the calibration strip in Embodiment 1 of the present utility model;

[0027] Figure 4 For Figure 1 The enlarged schematic diagram at A in

[0028] Figure 5 The structural schematic diagram of the locking member in Embodiment 1 of the present utility model;

[0029] Figure 6 The structural schematic diagram of the two hoop plates when unfolded in Embodiment 1 of the present utility model;

[0030] Figure 7 The elevation view of the pipe welding alignment fixture described in Embodiment 2 of the present utility model;

[0031] Figure 8 The structural schematic diagram when the two hoop plates in Embodiment 2 of the present utility model are unfolded.

[0032] In the figure: 1 hoop body; 11 locking member; 111 telescopic member; 112 flipping plate; 113 cylinder; 114 connecting plate; 115 handle; 12 hoop plate; 121 arc bar; 122 connecting rod; 1221 screw hole; 2 coaxiality measuring member; 21 ranging probe group; 211 ranging probe; 22 calibration bar; 221 rotating shaft; 222 waist-shaped smooth hole; 23 telescopic adjusting member; 231 movable block; 232 screw rod; 233 mounting seat; 234 guide rod; 235 knob; 236 straight scale; 3 clamping assembly; 31 clamping bolt; 311 wear-resistant head; 4 pipe. Detailed implementation manners

[0033] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model. In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the accompanying drawings. The advantages and features of the present utility model will be clearer according to the following description and the claims. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the embodiments of the present utility model.

[0034] Embodiment 1

[0035] As Figure 1 shown, this embodiment provides a pipe welding alignment fixture, including a hoop body 1, a coaxiality measuring member 2 and two groups of clamping assemblies 3. The two groups of clamping assemblies 3 are respectively arranged at both ends of the hoop body 1. The coaxiality measuring member 2 is arranged on the hoop body 1. The butt joint of two pipes 4 passes through the inside of the hoop body 1, and the two groups of clamping assemblies 3 correspond to the two pipes 4 one by one. The two groups of clamping assemblies 3 are respectively used to clamp the corresponding pipes 4. The coaxiality measuring member 2 is used to measure the coaxiality when the two pipes 4 are butted. In this way, after the two pipes are initially butted, the hoop body can be buckled on the butt joint of the two pipes. The two groups of clamping assemblies clamp the mutually approaching ends of the two pipes respectively, and the coaxiality of the two pipes is measured by the coaxiality measuring member. If the coaxiality is not good, the coaxiality of the two pipes is continuously adjusted by the two groups of clamping assemblies until the measurement result of the coaxiality measuring member meets the requirements (in this embodiment, the butt joint of the two pipes is located between the two groups of clamping assemblies).

[0036] As Figure 1 、 Figure 4 andFigure 6 As shown, the clamping assembly 3 in the above technical scheme includes a plurality of clamping bolts 31, and a plurality of screw holes 1221 distributed radially are evenly arranged at both ends of the clamp body 1 along the circumferential direction, and the plurality of screw holes 1221 at the same end correspond one-to-one to the plurality of clamping bolts 31 in the corresponding clamping assembly 3, and the plurality of clamping bolts 31 are evenly distributed along the circumferential direction at the corresponding ends of the clamp body 1, and each of the clamping bolts 31 is threadedly connected to the corresponding screw hole 1221, and the threaded end of the clamping bolt 31 faces the inside of the clamp body 1, and the plurality of clamping bolts 31 in the same group are used to circumferentially clamp the butt ends of the corresponding pipes 4, and the structure is simple, so that a pipe can be clamped from the circumferential direction by using a plurality of clamping bolts, and the axial position of the pipe can be adjusted in the clamp body by adjusting the feed amount of the plurality of clamping bolts relative to the clamp body.

[0037] In the above technical solution, 3-5 clamping bolts 31 are arranged in each group of the clamping assembly 3, and the threaded end of the clamping bolt 31 is provided with a wear-resistant head 311. The use of 3-5 clamping bolts can meet the clamping requirements of the pipeline. In addition, a wear-resistant head is provided at the threaded end of the clamping bolt, which makes the durability of the clamping bolt good.

[0038] like Figure 1 and Figure 5 As shown, the clamp body 1 in the above technical solution includes a locking piece 11 and two semicircular hoop plates 12, the arc openings of the two hoop plates 12 are aligned with each other, and one end of the two hoop plates 12 is rotatably connected, the two hoop plates 12 can be swung to close or unfold, and the two hoop plates 12 are connected by the locking piece 11 when they are rotated to close, and the structure is simple, and the clamp body cooperates with the two sets of clamping components to achieve a good clamping effect on the pipeline.

[0039] In the above technical solution, the locking member 11 includes a telescopic member 111 and an n-shaped turning plate 112. Connecting plates 114 are arranged on the outer sides of the two hoop plates 12 away from the ends where they are rotationally connected. When the two hoop plates 12 are swung to be closed, the two connecting plates 114 are attached to each other. The notch side of the turning plate 112 is rotationally connected to both sides of one of the connecting plates 114. The telescopic member 111 is vertically installed on the other turning plate 112, and its telescopic end faces away from the other hoop plate 12. A cylinder 113 is vertically arranged on the inner bottom wall of the turning plate 112. When the two hoop plates 12 are swung to be closed and the turning plate 112 is swung so that the cylinder 113 is aligned with the telescopic end of the telescopic member 111, the telescopic member 111 extends so that its telescopic end is inserted into the cylinder 113 to lock the two hoop plates 12, or the telescopic member 111 contracts to unlock the two hoop plates 12. Its structure is simple, and when the two hoop plates are swung to be closed, the telescopic member can cooperate with the turning plate to lock or unlock conveniently. The telescopic member 111 can be a telescopic electric cylinder, a telescopic air cylinder or a hydraulic cylinder.

[0040] In this embodiment, an n-shaped handle 115 can also be arranged at the top of the turning plate, which makes it more convenient to turn the turning plate.

[0041] In the above technical solution, the hoop plate 12 includes two arc-shaped rods 121 and multiple connecting rods 122. The arc-shaped rods 121 are both semi-circular. The two arc-shaped rods 121 are parallel to each other and spaced apart. Multiple connecting rods 122 are horizontally arranged between the two arc-shaped rods 121 and are spaced apart along the length direction of the arc-shaped rods 121. The two ends of each connecting rod 122 are connected to the two arc-shaped rods 121. The two ends of the two arc-shaped rods 121 form the two ends of the hoop plate 12. In this way, the whole hoop plate is a hollow structure, which can conveniently observe whether the clamping assembly clamps the pipeline tightly (wherein, multiple screw holes 1221 are respectively arranged on multiple connecting rods, and two are arranged at intervals along the length direction of each connecting rod. The two connecting bolts installed on the same connecting rod belong to two groups of clamping assemblies respectively).

[0042] Such as Figure 2 and Figure 4As shown, in the above technical solution, the coaxiality measuring member 2 includes a calibration strip 22 and two telescopic adjusting members 23. The telescopic length of the telescopic adjusting member 23 is measurable. The two telescopic adjusting members 23 are respectively installed at both ends of the hoop body 1 and are distributed oppositely at both ends of the hoop body 1. The telescopic end of each telescopic adjusting member 23 faces the inside of the hoop body 1 along the radial direction of the hoop body 1. The calibration strip 22 is arranged inside the hoop body 1, and both ends thereof are swing-connected to the telescopic ends of the two telescopic adjusting members 23. In this way, after the two clamping assemblies clamp the butt ends of the two pipes and preliminarily adjust the coaxiality of the two pipes, the two telescopic adjusting members can be adjusted so that the calibration strip abuts against the outer walls of the butt ends of the two pipes. Then, by measuring the extension lengths of the two telescopic adjusting members, if the extension lengths of the two are the same or close, it can be considered that the coaxiality of the two pipes is good; otherwise, the coaxiality of the two pipes needs to be continuously adjusted by the two clamping assemblies. In this embodiment, the coaxiality measuring member is arranged on the two hoop bar rods corresponding to the same hoop plate.

[0043] In the above technical solution, the telescopic adjusting member 23 includes a movable block 231, a lead screw 232, a mounting seat 233, a guide rod 234, a knob 235 and a straight scale 236. The mounting seat 233 is installed at the corresponding end of the hoop body 1. A threaded hole 2331 and a guide sliding hole 2332 penetrating along the radial direction of the hoop body 1 are provided on the mounting seat 233. The lead screw 232 is engaged with the threaded hole 2331 and is threadedly connected to the mounting seat 233. The guide rod 234 slides through the guide sliding hole 2332. The movable block 231 is installed at one end of the guide rod 234 inside the hoop body 1. The movable block 231 is rotatably connected to one end of the lead screw 232 inside the hoop body 1. The knob 235 is fixedly installed at the other end of the lead screw 232. The straight scale 236 is installed beside the mounting seat 233 and the movable block 231, and is fixedly connected to the mounting seat 233 and is parallel to the guide rod 234. The straight scale 236 is used to measure the distance between the movable block 231 and the mounting seat 233. In this way, each elongation adjusting member is a manually operated lead screw driving member, and the straight scale provided on the elongation adjusting member can directly measure the distance between the movable block and the mounting seat, which is convenient to use.

[0044] As Figure 2 shown, in this embodiment, the movable block is an n-shaped block, the notch thereof faces the axis of the hoop body 1, and its inner groove penetrates along the axial direction of the hoop body 1, as Figure 3As shown in the figure, a rotating shaft 221 is vertically arranged at one end of the calibration strip (the rotating shaft 221 can be fixedly arranged on the calibration strip and rotatably connected to the corresponding movable block). At the other end of the calibration strip, there are waist-shaped smooth holes 222 distributed along its length direction. A rotating shaft 221 also penetrates and slides in the waist-shaped smooth holes 222 (both ends of the rotating shaft 221 can be fixedly connected to the corresponding movable blocks. The length of the waist-shaped smooth holes 222 can be 1 - 2 cm, which is only used to provide the calibration strip with a tilting movement margin relative to the axis of the hoop body. And the rotating shaft 221 abuts against the two long sides of the waist-shaped smooth holes 222, so as to prevent the calibration strip from shaking radially along the rotating shaft 221 relative to the hoop body). The two rotating shafts are respectively located in the grooves of the two movable blocks and are respectively connected to the inner groove walls of the corresponding movable blocks. In this embodiment, the calibration strip is a straight strip plate, and one side of its long side is used to abut against the two pipes for calibration alignment.

[0045] Figure 6 In the figure, the dotted line B represents the axis at the swinging position of the two hoop plates, and the dotted line C represents the middle dividing line of the two hoop plates (the multiple clamping bolts on both sides of the middle dividing line respectively belong to the same clamping assembly).

[0046] Embodiment 2

[0047] Same as Embodiment 1, the difference is that, as Figure 7 and Figure 8 shown in the figure, in this embodiment, the coaxiality measuring member 2 includes two groups of ranging probe groups 21, and at least two ranging probes 211 are provided in each group of ranging probe groups 21. The two groups of ranging probe groups 21 are respectively arranged at both ends of the hoop body 1, and the multiple ranging probes 211 in the same group are circumferentially spaced apart and distributed in the same circle at the corresponding end of the hoop body 1, and the circle where they are located is coaxially distributed with the hoop body 1. And the detection part of each ranging probe 211 faces the corresponding pipe 4 along the radial direction of the hoop body 1. In this way, the coaxiality of the corresponding pipe relative to the hoop body can be adjusted by the cooperation of the ranging probe group and the corresponding clamping assembly, so as to adjust the coaxiality of the relative distribution of the two pipes. In this embodiment, the ranging probe can be a laser ranging probe.

[0048] In the above technical solution, each group of ranging probe groups 21 has two ranging probes 211, and the central angle corresponding to the two ranging probes 211 in the same group on the hoop body 1 is a right angle or an acute angle (preferably a right angle. At this time, the two groups of ranging probe groups can be arranged on both sides of the same hoop plate). Its structure is simple, and the coaxiality of the corresponding pipe relative to the hoop body can be preliminarily adjusted by the two ranging probes.

[0049] Among them, Figure 7 the dotted line B in the figure represents the axis at the connection where the two hoop plates are rotated to.Figure 8 The dashed line B represents the axis at the swinging position of the two hoop plates, and the dashed line C represents the middle dividing line of the two hoop plates (a plurality of clamping bolts on both sides of the middle dividing line belong to the same clamping assembly respectively, and a plurality of ranging probes on both sides of the middle dividing line belong to the same ranging probe group 21).

[0050] Preferably, in this embodiment, the two groups of the ranging probe groups are respectively arranged on the sides of two arc-shaped rod members of the same hoop plate that are away from each other, and the two ranging probes in the same group are distributed at intervals along the length direction of the corresponding arc-shaped rod member.

[0051] The above is only the preferred embodiment of the present invention, and does not impose any form of limitation on the present invention; any ordinary technician in the industry can smoothly implement the present invention according to the illustrations in the specification and the above description; however, any equivalent changes, such as slight modifications, decorations, and evolutions made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above, are equivalent embodiments of the present invention; at the same time, any equivalent changes, such as modifications, decorations, and evolutions made to the above embodiments based on the substantial technology of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A pipeline welding alignment fixture, characterized in that: The invention comprises a clamp body (1), a coaxiality measuring piece (2) and two groups of clamping assemblies (3), wherein the two groups of clamping assemblies (3) are respectively arranged at two ends of the clamp body (1), the coaxiality measuring piece (2) is arranged on the clamp body (1), the butt joint of two pipes (4) passes through the clamp body (1), and the two groups of clamping assemblies (3) correspond to the two pipes (4) one by one, the two groups of clamping assemblies (3) are respectively used to clamp the corresponding pipes (4), and the coaxiality measuring piece (2) is used to measure the coaxiality of the two pipes (4) when they are butt jointed.

2. The pipeline welding alignment fixture according to claim 1 is characterized in that: The clamping assembly (3) comprises a plurality of clamping bolts (31), and a plurality of screw holes (1221) distributed radially are evenly arranged at circumferential intervals at both ends of the clamping body (1), and the plurality of screw holes (1221) at the same end correspond one-to-one to the plurality of clamping bolts (31) in the corresponding clamping assembly (3). The plurality of clamping bolts (31) are evenly distributed at circumferential intervals at the corresponding ends of the clamping body (1), and each clamping bolt (31) is threadedly connected to the corresponding screw hole (1221), and the threaded end of the clamping bolt (31) faces the inside of the clamping body (1). The plurality of clamping bolts (31) in the same group are used to circumferentially clamp the butt ends of the corresponding pipes (4).

3. The pipeline welding alignment fixture according to claim 2 is characterized in that: Each group of the clamping components (3) is provided with 3 to 5 clamping bolts (31), and the threaded ends of the clamping bolts (31) are provided with wear-resistant heads (311).

4. The pipeline welding alignment fixture according to claim 1 is characterized in that: The coaxiality measuring component (2) comprises two groups of distance measuring probe groups (21), and each group of the distance measuring probe groups (21) is provided with at least two distance measuring probes (211). The two groups of the distance measuring probe groups (21) are respectively arranged at two ends of the clamp body (1), and a plurality of the distance measuring probes (211) of the same group are distributed circumferentially and spaced apart at corresponding ends of the clamp body (1) and are distributed in the same circle, and the circle in which they are located is coaxially distributed with the clamp body (1), and the detection portion of each distance measuring probe (211) is directed toward the corresponding pipe (4) along the radial direction of the clamp body (1).

5. The pipeline welding alignment fixture according to claim 4 is characterized in that: Each group of the distance measuring probe groups (21) comprises two distance measuring probes (211), and the corresponding arc center angles of the two distance measuring probes (211) in the same group on the clamp body (1) are right angles or acute angles.

6. The pipeline welding alignment fixture according to claim 1, characterized in that: The coaxiality measuring member (2) comprises a calibration strip (22) and two telescopic adjustment members (23), the telescopic length of the telescopic adjustment members (23) being measurable, and the two telescopic adjustment members (23) being respectively mounted at two ends of the clamp body (1) and being relatively distributed at two ends of the clamp body (1), the telescopic end of each telescopic adjustment member (23) being directed toward the inside of the ring of the clamp body (1) along the radial direction of the clamp body (1), the calibration strip (22) being arranged in the ring of the clamp body (1), and the two ends of the calibration strip (22) being respectively rotatably connected to the telescopic ends of the two telescopic adjustment members (23).

7. The pipeline welding alignment fixture according to claim 6, characterized in that: The telescopic adjustment member (23) comprises a movable block (231), a screw rod (232), a mounting seat (233), a guide rod (234), a knob (235) and a ruler (236); the mounting seat (233) is mounted on the corresponding end of the clamp body (1); the mounting seat (233) is provided with a threaded hole (2331) and a guide sliding hole (2332) radially penetrating the clamp body (1); the screw rod (232) is threadedly connected to the threaded hole (2331) and the mounting seat (233); the guide rod (234) slides through the guide sliding hole (2332); the movable block (231) is provided with a screw rod (232) and a guide sliding hole (2332); (231) is installed on one end of the guide rod (234) located in the ring of the clamp body (1), the movable block (231) is rotatably connected to one end of the screw rod (232) located in the ring of the clamp body (1), the knob (235) is fixedly installed on the other end of the screw rod (232), the straight ruler (236) is installed beside the mounting seat (233) and the movable block (231), and is fixedly connected to the mounting seat (233), and the guide rods (234) are parallel to each other, and the straight ruler (236) is used to measure the distance from the movable block (231) to the mounting seat (233).

8. The pipeline welding alignment fixture according to claim 1, characterized in that: The hoop body (1) comprises a locking piece (11) and two semicircular hoop plates (12), the arc openings of the two hoop plates (12) are aligned with each other, and one end of the two hoop plates (12) is rotatably connected, the two hoop plates (12) can be swung to be closed or unfolded, and the two hoop plates (12) are connected by the locking piece (11) when they are rotated to be closed.

9. The pipeline welding alignment fixture according to claim 8, characterized in that: The locking member (11) comprises a telescopic member (111) and an n-shaped flip plate (112). A connecting plate (114) is provided on the outer side of the two hoop plates (12) away from the end where the two hoop plates (12) are connected. When the two hoop plates (12) are swung to close, the two connecting plates (114) fit each other, and the notch side of the flip plate (112) is connected to the two sides of one of the connecting plates (114). The telescopic member (111) is vertically mounted on the other flip plate (112), and its telescopic member (111) is arranged on the outer side of the two hoop plates (12). The end of the retractable plate (112) faces away from the other hoop plate (12), a cylinder (113) is vertically arranged on the inner bottom wall of the flip plate (112), the two hoop plates (12) are swung to close, and the retractable plate (112) is swung until the cylinder (113) is aligned with the telescopic end of the telescopic member (111), the telescopic member (111) is extended until its telescopic end is inserted into the cylinder (113) to lock the two hoop plates (12), or the telescopic member (111) is contracted to unlock the two hoop plates (12).

10. The pipeline welding alignment fixture according to claim 9, characterized in that: The hoop plate (12) comprises two arc bars (121) and a plurality of connecting bars (122); the arc bars (121) are semicircular; the two arc bars (121) are parallel to each other and are spaced apart; the plurality of connecting bars (122) are transversely arranged between the two arc bars (121) and are spaced apart along the length direction of the arc bars (121); and the two ends of each connecting bar (122) are connected to the two arc bars (121); the two ends of the two arc bars (121) constitute the two ends of the hoop plate (12).

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