Pipeline welding positioning device

Abstract

The present invention provides a pipeline welding positioning device, and relates to the technical field of pipeline welding auxiliary equipment. The pipeline welding positioning device provided by the present invention comprises: a support frame, a sliding sleeve and a clamping mechanism; the support frame comprises a frame and a support leg for supporting the frame, the frame comprises a relatively arranged cross beam and a relatively arranged longitudinal beam, and the two ends of the longitudinal beam are respectively fixed to the two cross beams; a sliding sleeve is slidably arranged on the longitudinal beam, and the sliding sleeve structure is connected to the clamping machine, the clamping mechanism is used to clamp the pipeline, and the position of the pipeline is changed by adjusting the position of the sliding sleeve on the longitudinal beam, thereby improving the accuracy of pipeline docking, and then improving the quality of pipeline welding.

Description

Technical Field

[0001] The invention relates to a pipeline welding positioning device and relates to the technical field of pipeline welding auxiliary equipment. Background Art

[0002] Oil and gas have become an important energy source. The oil and gas directly extracted by oil production equipment needs to be transported to a designated location as a usable energy source. Pipeline transportation of oil and gas is the most reliable mode of transportation. At present, multi-section pipeline splicing and welding is used as the transportation pipeline for oil and gas.

[0003] In the prior art, before welding and assembling multiple sections of pipelines, both ends of the pipelines to be welded need to be aligned manually. Manual operation makes it difficult to ensure the alignment of the pipeline joints, resulting in large misalignment of the pipeline joints after welding, making it difficult to ensure the welding quality of the transport pipeline. Summary of the invention

[0004] The present invention provides a pipeline welding positioning device to solve the above-mentioned defects in the prior art. By adopting the pipeline welding positioning device of the present application to adjust the position of the pipeline, the alignment accuracy of the pipeline to be welded is improved, and the welding quality of the pipeline is effectively improved.

[0005] The present invention provides a pipeline welding positioning device, comprising: a support frame, a sliding sleeve and a clamping mechanism;

[0006] The support frame includes a frame and support legs for supporting the frame, the frame includes oppositely arranged cross beams and oppositely arranged longitudinal beams, and the two ends of the longitudinal beams are respectively fixed to the two cross beams;

[0007] The sliding sleeve is slidably disposed on the longitudinal beam, the clamping mechanism is connected to the sliding sleeve, and the clamping mechanism is used to clamp the pipeline.

[0008] Optionally, a retractable part is further included, and the clamping mechanism is connected to the sliding sleeve via the retractable part.

[0009] Optionally, the retractable member is a hydraulic cylinder, a cylinder barrel of the hydraulic cylinder is fixed to the sliding sleeve, and a hydraulic rod of the hydraulic cylinder is fixed to the clamping mechanism.

[0010] Optionally, the sliding sleeve includes: a screw rod disposed on the longitudinal beam, and a sliding block threadably connected to the screw rod.

[0011] Optionally, a groove is provided on the longitudinal beam, and the screw is installed in the groove.

[0012] Optionally, the sliding block is sleeved on the longitudinal beam, and a portion of the sliding block in contact with the screw rod is provided with a thread for connecting with the screw rod.

[0013] Optionally, a bearing hole is provided on the crossbeam for the end of the screw to pass through, and a bearing for supporting the screw is installed in the bearing hole;

[0014] The screw rod is provided with a handle at least at one end.

[0015] Optionally, the clamping mechanism comprises: a locking member and two clamping arms arranged opposite to each other, the connecting ends of the two clamping arms are sleeved together, and the locking member is used to lock the connecting ends of the two clamping arms.

[0016] Optionally, the inner surface of the clamping end of the clamping arm is provided with a protrusion for increasing friction resistance.

[0017] Optionally, rollers are provided at the bottom of the supporting feet.

[0018] The pipeline welding positioning device provided by the present invention comprises: a support frame, a sliding sleeve and a clamping mechanism; the support frame comprises a frame and support legs for supporting the frame, the frame comprises oppositely arranged cross beams and oppositely arranged longitudinal beams, and the two ends of the longitudinal beams are respectively fixed to the two cross beams; a sliding sleeve is slidably arranged on the longitudinal beam, and the sliding sleeve structure is connected to the clamping machine, the clamping mechanism is used to clamp the pipeline, and the position of the pipeline is changed by adjusting the position of the sliding sleeve on the longitudinal beam, so that the accuracy of the radial direction when the pipeline is butted can be improved, thereby improving the quality of pipeline welding.

[0019] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the embodiments of the present invention will become more easily understood through the following detailed description with reference to the accompanying drawings, in which several embodiments of the present invention will be described by way of example and not limitation, wherein:

[0021] Figure 1 A schematic structural diagram of a pipeline welding positioning device provided in an embodiment;

[0022] Figure 2 A schematic diagram of a partial structure of a support frame provided in an embodiment;

[0023] Figure 3 A schematic diagram of the structure of a slider provided in an embodiment;

[0024] Figure 4 A schematic diagram of a screw structure provided in an embodiment;

[0025] Figure 5A schematic structural diagram of a clamping mechanism provided in an embodiment;

[0026] Figure 6 A schematic end view of another clamping mechanism provided in an embodiment;

[0027] Figure 7 A schematic structural diagram of another pipeline welding positioning device provided in an embodiment.

[0028] Reference numerals:

[0029] 100: support frame; 110: cross beam; 120: longitudinal beam;

[0030] 130: supporting leg; 121: groove; 111: bearing hole;

[0031] 200: sliding sleeve; 201: screw rod; 202: handle;

[0032] 203: slider; 204: bearing; 205: thread;

[0033] 300: clamping mechanism; 310: locking member; 320: clamping arm;

[0034] 321: connecting end; 322: clamping end; 500: retractable part;

[0035] 400: roller; 600: connecting rod. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] It should be understood that the following embodiments do not limit the execution order of the steps in the method protected by the present invention. The steps of the method of the present invention can be executed in any possible order and in a cyclic manner without being contradictory.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In addition, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] Example

[0041] Figure 1 A schematic diagram of the structure of a pipeline welding positioning device provided in this embodiment; Figure 2 A schematic diagram of a partial structure of a support frame provided in this embodiment; Figure 3 A schematic diagram of the structure of the slider provided in this embodiment; Figure 4 A schematic diagram of the screw structure provided in this embodiment; Figure 5 A schematic diagram of the structure of a clamping mechanism provided in this embodiment; Figure 6 This is a schematic end view of another clamping mechanism provided in this embodiment. Figure 7 A schematic structural diagram of another pipeline welding positioning device provided in this embodiment.

[0042] Please refer to Figure 1 The pipeline welding positioning device provided in this embodiment includes: a support frame 100, a sliding sleeve 200 and a clamping mechanism 300; the support frame 100 includes a frame and a support leg 130 for supporting the frame, the frame includes a relatively arranged cross beam 110 and a relatively arranged longitudinal beam 120, and the two ends of the longitudinal beam 120 are respectively fixed to the two cross beams 110; the sliding sleeve 200 is slidably provided on the longitudinal beam 120, and the clamping mechanism 300 is connected to the sliding sleeve 200. The clamping mechanism 300 is used to clamp the pipeline, that is, the sliding sleeve 200 slides on the longitudinal beam 120 to drive the clamping mechanism 300 to move, thereby adjusting the position of the pipeline and realizing the docking of two sections of the pipeline.

[0043] Specifically, in this embodiment, the framework can be used as follows Figure 1 The rectangular frame structure shown is a support structure composed of two cross beams 110 and two longitudinal beams 120. Of course, the frame can also adopt a polygonal structure, which can be set according to actual use. Here, this embodiment is only illustrated by a rectangular frame structure, and the form of the frame is not specifically limited.

[0044] Specifically, use Figure 1The strip steel plates shown are used as the cross beam 110 and the longitudinal beam 120. Of course, the cross beam 110 and the longitudinal beam 120 may also be in other shapes, such as cylindrical steel bars. Optionally, the frame may be an integrally formed structure, such as a molded integrally formed structure or a cast structure. Of course, the cross beam 110 and the longitudinal beam 120 may also be fixedly connected by fasteners to form a frame structure. In this embodiment, a rectangular structure formed by bending a strip steel plate is preferably used as the frame, which has a simple structure and saves costs.

[0045] Specifically, in this embodiment, Figure 1 As shown, rectangular steel bars are used as support legs 130, and four rectangular steel bars are arranged at the four corners of the rectangular frame by welding. Of course, in other examples, support legs 130 of any shape such as a table or a prism can be used. In addition, the position of the support legs 130 can also be specifically set according to actual usage. For example, the support legs 130 can be respectively set at any position along the length direction of the crossbeam 110 and the longitudinal beam 120. Similarly, the number of support legs 130 can also be set according to actual needs to ensure the stability of the support frame 100. In summary, this embodiment does not specifically limit the setting form of the support legs 130.

[0046] For example, in the specific manufacturing process, strip steel plates can be used as support legs 130, cross beams 110 and longitudinal beams 120, and an overall frame structure formed by splicing and welding multiple strip steel plates can be used as a support frame 100. The frame support frame 100 is convenient for operators to observe the position of the pipes to be connected, and is also convenient for welding operations on the aligned pipes.

[0047] Specifically, a sliding sleeve 200 is slidably disposed on the longitudinal beam 120. For example, in this embodiment, please refer to Figure 1 A sliding sleeve 200 is slidably provided on each of the two longitudinal beams 120 of the rectangular frame. The two sliding sleeves 200 are respectively connected to a clamping mechanism 300. The two clamping mechanisms 300 are used to clamp two sections of pipes to be aligned. By changing the relative positions of the two sliding sleeves 200, the relative positions of the two sections of pipes can be conveniently adjusted to achieve alignment of the pipes.

[0048] Specifically, Figure 1 As shown, the sliding sleeve 200 may include a screw rod 201 disposed on the longitudinal beam 120, and a slider 203 threadedly connected to the screw rod 201. For example, a support frame may be provided on the longitudinal beam 120 to support the screw rod 102 and the slider 203 sleeved on the screw rod 102. Of course, the screw rod 201 and the longitudinal beam 120 may also be matched in other forms, for example, referring to Figure 2In some examples, a groove 121 may be provided on the longitudinal beam 120 so that the screw rod 201 can be installed in the groove 121. At this time, the slider 203 may be provided in the groove 121 at the same time, or may be provided as Figure 1 and Figure 5 As shown, the slider 203 is sleeved on the longitudinal beam 120, and accordingly, the portion of the slider 203 that contacts the screw 201 is provided with a thread 205 for connecting with the screw 201, so as to realize the threaded transmission connection between the slider 203 and the screw 201. In other words, the screw 201 and the slider 203 sleeved on the longitudinal beam 120 are threadedly transmitted, and the slider 203 is slidable on the longitudinal beam 120 by rotating the screw 201 in the longitudinal beam groove 121.

[0049] For further information, please refer to Figure 2 The crossbeam 110 is provided with a bearing hole 111 for the end of the screw rod 201 to pass through, and a bearing for supporting the screw rod 201 is installed in the bearing hole 111 .

[0050] Specifically, two arc-shaped holes as bearing holes 111 are opened at the same end of two oppositely arranged cross beams 110 along the length direction of the longitudinal beam 120, and the center line of the two arc-shaped holes is parallel to the longitudinal beam 120. Bearings for supporting the screw 201 are respectively installed in the two arc-shaped holes, so that the screw 201 is rotatably fixed on the longitudinal beam 120.

[0051] For example, in this embodiment, please refer to Figure 2 , an arc-shaped groove is provided on the top surface of the longitudinal beam 120 as a groove 121, and the arc-shaped groove is used to accommodate the screw rod 201, and can also ensure the strength of the longitudinal beam 120 itself. Optionally, the arc of the arc-shaped groove can be greater than 90°, to ensure that the groove 121 provided on the longitudinal beam 120 is large enough to accommodate the screw rod 201. When the arc of the arc-shaped groove is larger, the accommodating space of the screw rod 201 is larger. Of course, under the condition of ensuring the strength of the longitudinal beam 120, the groove 121 can be set to any shape, for example, the groove 121 can be a rectangular groove.

[0052] During specific manufacturing, the groove 121 can also be opened on the side or bottom of the longitudinal beam 120, that is, the groove 121 can be set on any side wall of the longitudinal beam 120 to accommodate the screw 201. Here, this embodiment does not specifically limit the setting shape and position of the groove 121.

[0053] The slider 203 is slidably mounted on the longitudinal beam 120. A through hole is provided on the slider 203 that is adapted to the cross-sectional shape of the longitudinal beam 120. The longitudinal beam 120 passes through the through hole so that the slider 203 is sleeved on the longitudinal beam 120. The slider 203 is driven to slide on the longitudinal beam 120 by rotating the screw 201. For example, in this embodiment, Figure 3As shown, a rectangular parallelepiped structure with a square through hole is used as the slider 203, so as to fix the clamping mechanism 300 on the side wall of the rectangular block-shaped slider 203. Of course, in other examples, a spherical structure can also be used as the slider 203. Here, this embodiment does not specifically limit the form of the slider.

[0054] Furthermore, the screw rod 201 is provided with a handle 202 at least at one end, and the screw rod 201 can be driven to rotate by holding the handle 202. For example, in this embodiment, please refer to Figure 1 and Figure 4 A handle 202 is provided at one end of the screw 201, and bearings 204 are provided at both ends of the screw. The screw 201 is rotatably installed in the groove of the longitudinal beam 120 through the two bearings 204. The handle 202 is turned to drive the screw 201 to rotate, thereby driving the slider 203 threadedly connected to the screw 201 to slide on the longitudinal beam 120. For example, in some other embodiments, handles 202 can be provided at both ends of the screw 201. When one of the handles 202 is damaged, the handle 202 at the other end of the screw 201 can be used to drive the screw 201 to rotate, thereby extending the service life of the screw 201.

[0055] Of course, the driving method of the screw 201 can also adopt the existing electric driving method, for example, a linear motor is used as the sliding sleeve 200, the two ends of the linear motor and the two ends of the longitudinal beam 120 are fixed, the stator of the linear motor is used as the slider 203, and the rotor of the linear motor is used as the screw 201. When the linear motor is energized, its rotor rotates to drive its stator to move in a straight line, thereby realizing the sliding of the slider 203 on the longitudinal beam 120.

[0056] Specifically, the clamping mechanism 300 is connected to the sliding sleeve 200. The clamping mechanism 300 is used to clamp the pipe. The sliding of the slider 203 on the longitudinal beam 120 drives the clamping mechanism 300 to move. The movement of the clamping mechanism 300 drives the clamped pipe to move, that is, the position of the pipe is adjusted by moving the slider 203, thereby improving the accuracy of pipe docking.

[0057] For example, in some embodiments, the clamping mechanism 300 can adopt a robotic arm commonly used in the prior art, one end of the robotic arm is fixedly connected to the slider 203 of the sliding sleeve 200 mounted on the longitudinal beam 120, and the other end of the robotic arm (that is, the free end) is used to clamp the pipe. The slider 203 moves on the longitudinal beam 120 to cooperate with the robotic arm to achieve accurate positioning of the pipe, thereby completing the accurate docking of the two sections of the pipe.

[0058] For example, in this embodiment, Figure 1As shown, the slider 203 is fixed to the clamping mechanism 300 through the connecting rod 600, so as to achieve synchronous movement of the clamping mechanism 300 and the slider 203. For example, in some other examples, the clamping mechanism 300 and the slider 203 may be directly fixedly connected without providing the connecting rod 600. Here, this embodiment does not specifically limit the connection method between the clamping mechanism 300 and the slider 203.

[0059] For further information, please refer to Figure 5 or Figure 7 The slider 203 can be fixedly connected to the clamping mechanism 300 through the telescopic member 500. The displacement change of the clamping mechanism 300 in the length direction of the crossbeam 110 is adjusted by the telescopic effect of the telescopic member 500, so that the pipeline moves along the direction of the crossbeam 110, and the slider 203 moves along the length direction of the longitudinal beam 120, so that the two pipelines to be connected are gradually brought closer to each other for connection. As a result, the deflection of the pipeline connection surface is reduced, the connection accuracy of the pipe to be welded is improved, and the welding quality of the pipeline is improved.

[0060] For example, in some examples, a cylinder is used as the retractable member 500; in other examples, an electric telescopic rod is used as the retractable member 500, which is convenient to use. For another example, when the weight of the pipe to be docked is large, a hydraulic cylinder can also be used as the retractable member 500, such as Figure 7 As shown, the cylinder barrel of the hydraulic cylinder is fixed to the sliding sleeve 200, and the hydraulic rod of the hydraulic cylinder is fixed to the clamping mechanism 300. Under the transmission action of the hydraulic cylinder, the heavy pipes can be smoothly and accurately docked, thereby improving the docking accuracy of the pipes and further improving the welding quality of the pipes.

[0061] Specifically, in this embodiment, Figure 5 As shown, the clamping mechanism 300 may include: a locking member 310 and two clamping arms 320 arranged opposite to each other, the connecting ends 321 of the two clamping arms 320 are sleeved together, the locking member 310 is used to lock the connecting ends 321 of the two clamping arms 320, and the clamping ends 322 of the two clamping arms 320 are used to clamp the pipe. In other words, the clamping mechanism 300 can clamp pipes of different diameters by adjusting the spacing between the two clamping arms 320, thereby expanding the application range of the clamping mechanism 300.

[0062] For example, in this embodiment, please refer to Figure 5The upper part of the clamping arm 320 serves as the connecting end 321, and the lower part of the clamping arm 320 serves as the clamping end 322. A locking screw is used as a locking member 310. The connecting ends 321 of the two relatively arranged clamping arms 320 adopt a sleeve structure. Under the action of the locking screw, the positions of the connecting ends 321 of the two clamping arms 320 are fixed. Before clamping the pipeline, the clamping mechanism 300 first loosens the locking screw, places the pipeline to be clamped between the two clamping arms 320, adjusts the distance between the two clamping arms 320 to adapt to the diameter of the pipeline to be clamped, tightens the locking screw to realize the clamping effect of the two clamping arms 320 on the pipeline, and the pipeline realizes position adjustment under the movement of the clamping mechanism 300.

[0063] For example, in some other embodiments, pins can be used as locking members 310, and multiple pairs of positioning holes for inserting pins are opened at the contact parts of the connecting ends 321 of the two clamping arms 320. When the spacing between the two clamping arms 320 is changed, the positioning holes at different positions are aligned. After the pins are inserted into the aligned positioning holes, the positions of the two clamping arms 320 can be fixed.

[0064] For example, in some other embodiments, the connecting ends 321 of the two clamping arms 320 can adopt the existing snap-on connection, that is, a latching protrusion is provided on the connecting end 321 of one of the clamping arms 320, and a corresponding latching groove is provided on the connecting end 321 of the other clamping arm 320. The relative positions of the two clamping arms are locked by the cooperation of the latching protrusion and the latching groove, and the distance between the two clamping arms 320 is adjusted so that the clamping structure can adapt to pipes of different diameters.

[0065] Furthermore, the part where the clamping end 322 of the clamping arm 320 contacts the pipe (i.e., the inner surface of the clamping end 322) is provided with a groove adapted to the shape of the pipe, thereby increasing the contact area between the clamping arm 320 and the pipe and ensuring the stability of the pipe clamping. Figure 5 When the pipe is round, the part where the clamping end 322 contacts the pipe can be provided with an arc groove. If the pipe is square, the part where the clamping end 322 contacts the pipe can be provided with a groove. Figure 6 Square groove shown.

[0066] Specifically, the inner surface of the clamping end 322 of the clamping arm 320 may also be provided with a protrusion for increasing friction resistance. By providing an anti-slip protrusion on the inner surface of the clamping end 322, the clamped pipe can be prevented from slipping from the clamping mechanism 300, thereby improving the reliability of pipe clamping and ensuring the docking accuracy of the pipe.

[0067] For further information, please refer to Figure 7The bottom of the support leg 130 may also be provided with a roller 400 so that the operator can transfer the position of the pipeline welding positioning device. For example, in some examples, the roller may be made of rubber, which can reduce noise during use. Of course, in other examples, a roller made of wear-resistant material may also be used to extend the service life of the roller.

[0068] Specifically, in some embodiments, a brake pad may be provided on the roller. When the operator moves the pipe welding positioning device to a working position, the roller may be locked by controlling the brake pad to prevent the pipe welding positioning device from moving during the pipe docking process, thereby increasing the misalignment of the pipe docking.

[0069] The pipeline welding positioning device proposed by the present invention comprises: a support frame 100, a sliding sleeve 200 and a clamping mechanism 300; the support frame 100 comprises a frame and a support leg 130 for supporting the frame, the frame comprises a cross beam 110 and a longitudinal beam 120 arranged oppositely, and the two ends of the two longitudinal beams 120 are respectively fixed to the two cross beams 110 to form a rectangular frame structure; a sliding sleeve 200 is respectively arranged on the two longitudinal beams 120, and each sliding sleeve 200 is connected to a clamping mechanism 300, and the two clamping mechanisms 300 are used to clamp two sections of pipelines to be butted, and the two sections of pipelines to be butted are connected by adjusting the sliding sleeve 200. The relative positions of the two sliding sleeves 200 are adjusted to realize the movement of the pipeline in the length direction of the longitudinal beam 120. At the same time, the clamping mechanism 300 is fixedly connected to the slider 203 on the sliding sleeve 200 through the telescopic member 500. The clamped pipeline is moved along the length direction of the cross beam 110 by adjusting the telescopic effect of the telescopic member 500. In this way, the two sections of the pipeline are gradually brought closer to achieve accurate docking of the pipeline, which improves the accuracy of pipeline docking and further improves the quality of pipeline welding. By setting a handle 202 at the end of the screw rod 201, it is convenient for the operator to hold and rotate the screw rod 201 to drive the slider 203 to slide on the longitudinal beam 120. In addition, a roller 400 can be set at the bottom of the support leg 130 to facilitate the operator to transfer the position of the pipeline welding positioning device. A roller with a brake pad can also be used to lock the position of the pipeline welding positioning device to ensure smooth docking of the pipeline.

[0070] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A pipeline welding positioning device, characterized in that: include: Support frame, sliding sleeve, retractable member and clamping mechanism; The support frame includes a frame and support legs for supporting the frame, the frame includes oppositely arranged cross beams and oppositely arranged longitudinal beams, and the two ends of the longitudinal beams are respectively fixed to the two cross beams; a roller with a brake pad is arranged at the bottom of the support leg; The sliding sleeve is slidably disposed on the longitudinal beam, the clamping mechanism is connected to the sliding sleeve, and the clamping mechanism is used to clamp the pipeline, so as to achieve movement of the pipeline in the length direction of the longitudinal beam by adjusting the relative position of the sliding sleeve; The clamping mechanism is connected to the sliding sleeve via the retractable member, so that the clamped pipe can be moved along the length direction of the beam by adjusting the retractable effect of the retractable member; The sliding sleeve comprises: a screw rod arranged on the longitudinal beam, and a slider threadedly connected to the screw rod; the slider is sleeved on the longitudinal beam, and a portion of the slider contacting the screw rod is provided with a thread for connecting with the screw rod; The longitudinal beam is provided with a groove, and the screw is installed in the groove; the cross beam is provided with a bearing hole for the end of the screw to pass through, and a bearing for supporting the screw is installed in the bearing hole; the screw is provided with a handle at least at one end; The clamping mechanism comprises: a locking member and two clamping arms arranged opposite to each other, the connecting ends of the two clamping arms are sleeved together, and the locking member is used to lock the connecting ends of the two clamping arms.

2. The pipeline welding positioning device according to claim 1, characterized in that: The retractable component is a hydraulic cylinder, a cylinder barrel of the hydraulic cylinder is fixed to the sliding sleeve, and a hydraulic rod of the hydraulic cylinder is fixed to the clamping mechanism.

3. The pipeline welding positioning device according to claim 1, characterized in that: The inner surface of the clamping end of the clamping arm is provided with a protrusion for increasing friction resistance.

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