A municipal heat pipe welding positioning device and method

Abstract

The present application relates to a kind of municipal heat pipeline welding positioning device and method, and it is related to the technical field of pipeline welding auxiliary equipment;Including positioning frame, positioning frame includes base and fixed seat, fixed seat includes two groups of L-shaped frame, two L-shaped frames are connected by support bar between them.Positioning frame is provided with: the clamping unit for the positioning and fixed pipe;Synchronous unit is convenient for the cooperative work of multiple positioning frames.The present application can solve the following problems existing in the process of the prior art to pipeline welding auxiliary: the cooperation piece of synchronous unit can be horizontally rotated, combined with the height adjustment of multistage telescopic rod, the horizontal included angle between multiple positioning frames can be flexibly changed, and the design direction of bent pipe is accurately reproduced, the problem that traditional device lacks bent pipe angle adjusting and fixing mechanism is solved.Through the synchronous adjustment of clamping jaw one, clamping jaw two and clamping jaw three in clamping unit, realize pipe automatic centering, guarantee the coaxiality of two pipes and the consistency of welding place spacing.

Description

Technical Field

[0001] This invention relates to the technical field of auxiliary equipment for pipeline welding, and in particular to a positioning device and method for welding municipal heating pipelines. Background Technology

[0002] As a core component of urban centralized heating systems, the quality of welded joints in municipal heating pipelines directly affects the sealing, pressure-bearing capacity, and long-term operational safety of the entire pipeline network. During pipeline installation and maintenance, it is often necessary to butt-weld two sections of pipeline on-site. This process requires precise axial alignment and a uniform weld gap between the two pipe ends to be welded. Any slight misalignment, eccentricity, or uneven gap can lead to stress concentration, poor weld formation, and even fatal defects such as incomplete penetration and slag inclusions, becoming potential hazards for pipeline leakage or rupture under thermal stress cycles and pressure loads.

[0003] However, while positioning devices are used in existing technologies, they suffer from two major problems due to the variety of pipe specifications and the complexity of construction scenarios. On the one hand, it is inconvenient for the pipe to cooperate and be clamped with the positioning mechanism. Thermal pipes are heavy and require heavy equipment for transportation, and existing positioning platforms are difficult to align. On the other hand, positioning bent pipes is difficult. Welding of straight and bent pipes is common and the interface accuracy requirements are high, but existing devices do not have dedicated positioning mechanisms for bent pipes, or they cannot support the bend, leading to offset, or multiple mechanisms lack a unified benchmark, making coordination difficult. Furthermore, they have poor versatility and require special tooling, limiting their application to complex scenarios.

[0004] For example, Chinese Patent Publication No. CN112338433A discloses a pipe welding positioning device. The provided pipe welding positioning device includes a support frame, a sliding sleeve, and a clamping mechanism. The support frame includes a frame and support legs for supporting the frame. The frame includes opposing crossbeams and opposing longitudinal beams, with both ends of the longitudinal beams fixed to the two crossbeams respectively. A sliding sleeve is slidably mounted on the longitudinal beam, and the sliding sleeve is connected to the clamping mechanism. The clamping mechanism is used to clamp the pipe. By adjusting the position of the sliding sleeve on the longitudinal beam, the position of the pipe is changed, thereby improving the accuracy of pipe docking and thus enhancing the quality of pipe welding.

[0005] However, the above-mentioned pipe welding positioning device still has some shortcomings in actual use:

[0006] 1. Existing technologies mainly rely on sliding sleeves and telescopic components to adjust the straight position of a single pipe, that is, to move along the longitudinal and transverse beams. However, they lack angle adjustment and fixing mechanisms for bends, and cannot provide a stable positioning reference for bent pipes.

[0007] 2. The existing clamping mechanism uses a locking device that requires manual operation to lock the two clamping arms. It lacks a self-centering function and cannot ensure that the pipeline is automatically centered during clamping. It relies entirely on the operator's experience to adjust the center position of the pipeline, making it difficult to guarantee accuracy.

[0008] Therefore, based on the above-mentioned viewpoints, it is of great significance to improve and perfect the existing thermal pipeline welding positioning device. It can not only clamp and fix the bent and straight pipelines simultaneously, but also center the pipeline to be welded during the clamping process, thus ensuring welding accuracy. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a welding positioning device and method for municipal heating pipelines.

[0010] On one hand, a municipal heating pipeline welding positioning device includes a positioning frame, the positioning frame including a base and a fixing seat, the fixing seat including two sets of U-shaped frames, the two U-shaped frames being connected by a support rod.

[0011] The positioning frame is equipped with:

[0012] A clamping unit for positioning and fixing pipelines.

[0013] A synchronization unit that facilitates the coordinated operation of multiple positioning frames.

[0014] The synchronization unit includes a multi-stage telescopic rod horizontally set at the bottom of the fixed base. The telescopic ends of the multi-stage telescopic rods are provided with a bearing plate. A mating block is rotatably installed on the bearing plate. A fixed block is placed at the end of the fixed base away from the mating block in the length direction. A positioning block is slidably installed inside the fixed block. A mating groove with the same shape as the mating block is opened on the positioning block.

[0015] Preferably, the clamping unit includes clamping claw one and clamping claw two that can slide along the height direction of the positioning frame, and two sets of clamping claw three that can slide along the width direction of the positioning frame.

[0016] Preferably, the clamping claw includes a clamping plate symmetrically arranged along the length direction of the fixed seat. The fixed seat has mounting grooves symmetrically opened along its length direction. A drive shaft is rotatably arranged in the mounting groove. A drive groove is rotatably opened in the drive shaft. A clamping rod is threadedly connected in the drive groove. The clamping plate is hinged to one end of the clamping rod located outside the drive groove.

[0017] Preferably, the second clamping claw includes a lifting rod slidably disposed on the top of the girder, the lifting rod passing through the girder and having the second clamping plate hinged to one end near the first clamping plate.

[0018] Preferably, a control component for controlling the lifting and lowering of the two clamping plates is installed between the tops of the two girder frames. The control component includes a drive gear, which is rotatably installed on the top of the girder frame and threadedly connected to the lifting rod on the outside of the lifting rod.

[0019] The lifting rod has a limiting groove extending along its axis on its side wall, and the top of the U-shaped frame has a through hole for the lifting rod to pass through. A limiting block is fixed in the through hole to guide the sliding of the limiting groove.

[0020] Preferably, the U-shaped frame is also provided with a synchronizing element for controlling the synchronous rotation of the two drive gears. The synchronizing element includes an extension rod fixedly connected between the tops of the two U-shaped frames, a synchronizing rod slidably provided along the axial direction of the extension rod, and a driven rack fixedly connected to both ends of the synchronizing rod, the driven rack meshing with the drive gear.

[0021] Two sets of drive screws are provided between the two support rods. Both ends of the drive screws are mounted on fixed seats on the support rods via bearings. One of the drive screws is equipped with a drive gear via a spline, and the synchronizing rod has a rack segment that meshes with the drive gear.

[0022] Preferably, the clamping claw three includes sliding shafts symmetrically arranged on the U-shaped frame along the width direction of the positioning frame, the two sliding shafts passing through the U-shaped frame, and a clamping plate three being hinged to one end of the corresponding shaft.

[0023] Preferably, the positioning frame is equipped with a control component that controls the relative movement of the two clamping plates. The control component includes a fixing rod symmetrically arranged along the base, and a receiving groove extending along the axis of the drive screw.

[0024] The fixed rod has a receiving groove, in which a synchronous screw is rotatably installed. The synchronous screw has a sliding seat that slides in the receiving groove and is symmetrically threaded on it. The drive screw has a sliding rod that is symmetrically threaded on it. The end of the sliding rod away from the drive screw is connected to the sliding seat by a snap-fit ​​design.

[0025] Preferably, the snap-fit ​​component includes an L-shaped snap-fit ​​block, and the movable base has a positioning groove that extends through the inside and outside. The snap-fit ​​block is slidably disposed in the positioning groove along its length direction via a telescopic rod. A T-shaped mating groove is provided on the side wall of the movable rod near the movable base, and the snap-fit ​​block is movably snapped into the mating groove.

[0026] On the other hand, a welding positioning method for municipal heating pipelines is as follows:

[0027] S1. Equipment preparation: Move the positioning frame to the pipe welding position using the casters with brakes and lock it.

[0028] S2. Preliminary Alignment: Place the welding ends of the two pipe sections to be welded at both ends of the base to preliminarily align the joints.

[0029] S3. Pipe fixing: Operate the clamping unit to make clamping claw one and clamping claw two clamp the pipe synchronously from the top and bottom, and clamping claw three clamp the pipe from the width direction, thereby forming a ring-shaped covering and fixing of the pipe.

[0030] S4. Coordinated Positioning and Welding: For straight pipelines, the multi-stage telescopic rods in the synchronization unit of multiple positioning frames are adjusted to ensure that all pipelines are in a straight line. For bent pipelines, the horizontal angle between adjacent positioning frames is adjusted by rotating the mating block and adjusting the multi-stage telescopic rods, so that the pipeline is positioned according to the preset direction, and then welding is performed.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] I. This invention allows the horizontal rotation of the mating block of the synchronization unit, combined with the height adjustment of the multi-stage telescopic rod, to flexibly change the horizontal angle between multiple positioning frames, accurately reproduce the design direction of the bend, and solve the problem of traditional devices lacking bend angle adjustment and fixing mechanisms.

[0033] The ring-shaped clamping claws one, two, and three form an all-around coverage, which can resist the forces and torques in all directions during pipe bending welding, avoid radial displacement or circumferential rotation of the pipe, and ensure the positioning accuracy at the bend.

[0034] Second, the present invention achieves synchronous adjustment of both sides of the clamping claw one in the clamping unit through the belt, synchronous lifting and lowering of the clamping claw two through the gear and rack transmission, and synchronous movement of both sides by the clamping claw three through the bidirectional threaded screw. It does not require the operator's experience, realizes automatic alignment of the pipeline, and ensures that the coaxiality of the two pipelines and the distance between the welds are consistent. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0037] Figure 2 This is a partial structural schematic diagram of the present invention.

[0038] Figure 3 This is a schematic diagram of the structure of the base of the present invention.

[0039] Figure 4 This is a schematic diagram of the structure of the fixing block of the present invention.

[0040] Figure 5 This is a schematic diagram of the structure of the clamping claw of the present invention.

[0041] Figure 6 This is a schematic diagram of the structure of the control component and the synchronization component of the present invention.

[0042] Figure 7 This is a schematic diagram of the position of the limiting block of the present invention.

[0043] Figure 8 This is a schematic diagram of the structure of the clamping claw two of the present invention.

[0044] Figure 9 This is a schematic diagram of the structure of the clamping claw three of the present invention.

[0045] Figure 10 This is the present invention. Figure 9 A schematic diagram of the structure at point A in the middle.

[0046] Figure 11 This is a structural schematic diagram of the fastener of the present invention.

[0047] In the diagram, 1. Positioning frame; 10. Base; 11. Fixed seat; 110. U-shaped frame; 111. Support rod; 2. Clamping unit; 3. Synchronization unit; 30. Multi-stage telescopic rod; 31. Bearing plate; 32. Mating block; 33. Fixed block; 34. Positioning block; 35. Docking groove; 20. Clamping claw one; 200. Clamping plate one; 201. Drive shaft; 202. Clamping rod one; 21. Clamping claw two; 210. Lifting rod; 211. Clamping plate two; 4. Control component one; 40. Drive gear. 41. Wheel; 5. Limiting groove; 6. Synchronizing component; 7. Extension rod; 8. Synchronizing rod; 9. Drive screw; 10. Driving gear; 11. Driven rack; 12. Clamping claw three; 13. Sliding shaft; 14. Clamping plate three; 15. Control component; 16. Fixing rod; 17. Synchronizing screw; 18. Moving seat; 19. Moving rod; 20. Snap-fit ​​component; 21. Snap-fit ​​block; 22. Positioning groove; 23. Mating groove; 44. Attaching component; 55. Limiting block; 66. Attaching component; 77. Extension block; 88. Attaching block; 99. Limiting block; 100. Attaching component; 11. Attaching block; 12. Attaching plate; 13. Attaching component; 14. Attaching component; 15. Attaching component; 16. Attaching component; 17. Attaching component; 18. Attaching component; 19. Attaching component; 10. Attaching component; 10. Attaching component; 11. Attaching block; 12. Attaching component; 13. Attaching component; 14. Attaching component; 15. Attaching component; 16. Attaching component; 17. Attaching component; 18. Attaching component; 19. Attaching component; 10. Attaching component; 10. Attaching component; 19. Attaching component; 10. Attaching component; 10. Attaching component; 11. Attaching component; 12 ... Detailed Implementation

[0048] The following combination Figures 1-11 The embodiments of the present invention will be described in detail below.

[0049] This application discloses a municipal heating pipeline welding positioning device and method. The invention is mainly applied in the process of pipeline welding auxiliary equipment. In terms of technical effect, it can avoid the problem of lacking angle adjustment and fixing mechanisms for bends in the pipeline welding process. Furthermore, the invention can also solve the problem in the prior art that rigid clamping of pipelines cannot guarantee that the pipeline can be automatically centered during clamping, and relies entirely on the operator's experience to adjust the center position of the pipeline, making it difficult to guarantee accuracy.

[0050] Example 1:

[0051] Reference Figure 1 and Figure 2As shown, specifically, a municipal heating pipeline welding positioning device includes a positioning frame 1, which includes a base 10 and a fixed seat 11. The bottom of the base 10 is provided with casters, which are omnidirectional wheels with a braking mechanism to facilitate the movement and fixation of the device. One end of the fixed seat 11 is hinged to the base 10. The fixed seat 11 includes two sets of U-shaped frames 110, which are connected by a support rod 111. A clamping unit 2 for positioning and fixing the pipeline is provided between the base 10 and the U-shaped frames 110.

[0052] First, place the base 10 at the welding position of the two pipes to be welded, and place the ends of the two pipes to be welded on the base 10 at the position of the clamping unit 2. Then, the pipe ends to be welded are clamped and fixed by the clamping unit 2.

[0053] The clamping unit 2 includes a clamping claw 20 and a clamping claw 21 that can slide along the height direction of the positioning frame 1, and two sets of clamping claws 22 that can slide along the width direction of the positioning frame 1.

[0054] The clamping claw 1 20 and clamping claw 21 are adjusted in height by vertical adjustment, and the two sets of clamping claw 3 22 are adjusted in width. The clamping claw 1 20 is set on the base 10, and the clamping claw 21 is set at the lower end of the top of the U-shaped frame 110 and is symmetrically arranged with the clamping claw 1 20. The clamping claw 1 20, clamping claw 21 and the two sets of clamping claw 3 22 are arranged in a ring to form a comprehensive covering and positioning of the pipeline.

[0055] In actual use, firstly, according to the diameter and position of the pipe to be welded, the positions of clamping claw 1 20 and clamping claw 21 in the height direction are adjusted synchronously to maintain an appropriate gap between clamping claw 1 20 and clamping claw 21 and the outer wall of the pipe. Then, the positions of the two sets of clamping claw 3 22 in the width direction are adjusted synchronously to form a complete annular covering structure. Synchronous adjustment can ensure that the pipe axis is located at the covering center formed by clamping claw 1 20, clamping claw 21 and the two sets of clamping claw 3 22 when finally clamped and positioned.

[0056] By simultaneously tightening each clamping claw of clamping unit 2, the pipe can be stably clamped, while ensuring the axial positioning of the pipe to be welded. This ring-shaped multi-point clamping method can effectively prevent the pipe from radial displacement or circumferential rotation during welding, and is particularly suitable for the precise positioning of pipes at bends.

[0057] The two pipes can be placed on the same positioning frame 1. When clamping the pipes, the two pipes will be clamped synchronously, which further ensures that the two pipes are on the same axis and that the spacing of each position where the two pipes need to be welded is consistent.

[0058] Reference Figure 3As shown, the base 10 is also equipped with a synchronization unit 3 to facilitate the coordinated operation of multiple positioning frames 1. The synchronization unit 3 enables the synchronous action of multiple positioning frames 1, and the clamping claws of the clamping unit 2 are tightened synchronously, thereby achieving stable clamping of the pipeline.

[0059] Reference Figure 2 and Figure 3 As shown, this is a schematic diagram of the structure of multiple positioning frames 1 working together: Specifically, the synchronization unit 3 includes a multi-stage telescopic rod 30 horizontally set at the bottom of the base 10. The telescopic end of the multi-stage telescopic rod 30 is provided with a bearing plate 31. The multi-stage telescopic rod 30 adopts a hydraulic drive method. Its cylinder base is fixedly connected to the bottom of the base 10 through a flange, and the telescopic end is fixedly connected to the bearing plate 31, so that the bearing plate 31 has a certain self-adjustment capability. The maximum extension length of the multi-stage telescopic rod 30 can reach three times the foundation length, which can adapt to the working conditions with different height differences.

[0060] A mating block 32 is rotatably mounted on the support plate 31, forming a rotatable connection with the support plate 31 via a slewing bearing, allowing the mating block 32 to be rotated and adjusted in the horizontal plane. A fixing block 33 is installed at the end of the base 10 away from the mating block 32 along its length. The fixing block 33 is welded and fixed to the end of the base 10. A positioning block 34 is slidably mounted inside the fixing block 33, and the positioning block 34 has a mating groove 35 that matches the shape of the mating block 32. A spring (not shown in the figure) is connected to a section of the positioning block 34 located inside the fixing block 33, providing it with a continuous preload. A handle is provided on the positioning block 34 through which the fixing block 33 passes. The handle can push the positioning block 34 up and down to achieve mechanical locking in the mating state.

[0061] The working logic of the synchronization unit 3 is as follows: When multiple positioning frames 1 need to work together, the mating block 32 of one positioning frame 1 is rotated to the required angle and then inserted into the docking groove 35 of the positioning block 34 of the adjacent positioning frame 1, and locked by the handle. By adjusting the length of the multi-stage telescopic rod 30 of each positioning frame 1, the relative position and horizontal angle of the adjacent positioning frames 1 in space can be precisely adjusted.

[0062] A stable working array can be quickly formed between multiple positioning frames 1. In the welding of long straight pipes, it can be ensured that each positioning frame 1 is kept on the same axis, and that the pipe will not be displaced or deformed during the welding process.

[0063] During pipe bending welding, the rotating design of the cooperating block 32 and the multi-stage telescopic rods 30 on the adjacent positioning frame 1 enable the device to adapt to the pipe connection requirements at different angles. By adjusting the distance in the length direction and the distance in the width direction after rotation, the horizontal angle between the positioning frames 1 can be changed. When handling pipe bending welding at complex angles, the operator can precisely control the spatial position of each positioning frame 1 to reproduce the design direction of the pipe and ensure welding accuracy.

[0064] Reference Figure 5 The diagram shows the structure of the clamping claw 20. Specifically, the clamping claw 20 includes a clamping plate 200 symmetrically arranged along the length of the base 10. The base 10 has mounting grooves symmetrically arranged along its length. A drive shaft 201 is rotatably arranged in the mounting groove. A drive groove is rotatably arranged in the drive shaft 201. A clamping rod 202 is threadedly connected in the drive groove. The clamping plate 200 is hinged to the end of the clamping rod 202 located outside the drive groove.

[0065] By rotating the drive shaft 201, the clamping rod 202 can move linearly within the drive groove, thereby driving the clamping plate 200 to achieve precise forward and backward adjustment in the height direction of the positioning frame 1. Furthermore, due to the sliding fit between the rectangular cavity structure of the mounting groove and the rectangular structure of the clamping rod 202, the movement of the clamping rod 202 along its axial direction can be effectively guaranteed.

[0066] The two drive shafts 201 are connected by a belt drive, which allows the clamping of the pipes on both sides to be carried out synchronously, ensuring that the adjustment of the two pipes can be carried out at the same time.

[0067] Reference Figure 6 and Figure 8 As shown, this is a schematic diagram of the structure of the second clamping claw 21. Specifically, the second clamping claw 21 includes a lifting rod 210 that is slidably disposed on the top of the U-shaped frame 110. The lifting rod 210 passes through the U-shaped frame 110 and is hinged to the second clamping plate 211 at one end near the first clamping plate 200.

[0068] The movement direction of clamping plate 211 is opposite to that of clamping plate 200. The movement of clamping plate 211 and clamping plate 200 is synchronized, ensuring that the midpoint between clamping plate 211 and clamping plate 200 coincides with the center of the pipe welding point, further ensuring that the two pipes can be synchronously adjusted and fixed in the height direction, and ensuring the accuracy of subsequent welding.

[0069] Reference Figure 6 , Figure 7 and Figure 8The diagram shows the structure for controlling the operation of the two clamping plates 211. Specifically, a control component 4 for controlling the lifting and lowering of the two clamping plates 211 is installed between the tops of the two girder frames 110. The control component 4 includes a drive gear 40, which is rotatably mounted on the top of the girder frame 110 via a bearing and is sleeved on the outside of the lifting rod 210 and threadedly connected to the lifting rod 210. The drive gear 40 has an internal thread in its inner hole, which forms a threaded engagement with the external thread on the outer surface of the lifting rod 210. A limiting groove 41 extending along its axis is provided on the side wall of the lifting rod 210. The top of the girder frame 110 has a through hole for the lifting rod 210 to pass through. A limiting block 8 is fixed in the through hole to guide the sliding of the limiting groove 41. When the drive gear 40 rotates, due to the cooperation between the limiting block 8 and the limiting groove 41, the lifting rod 210 cannot rotate and can only move in a straight line in the vertical direction, thereby realizing the precise lifting and lowering adjustment of the clamping plate 211.

[0070] Reference Figure 6 and Figure 8 As shown, this is a schematic diagram of the structure of the two lifting rods 210. Specifically, the U-shaped frame 110 is also provided with a synchronizing element 5 to control the synchronous rotation of the two drive gears 40. The synchronizing element 5 includes an extension rod 50 fixedly connected between the tops of the two U-shaped frames 110, and a synchronizing rod 51 slidably provided along the axial direction of the extension rod 50. Both ends of the synchronizing rod 51 are fixedly connected with a passive rack 54. The passive rack 54 meshes with the drive gear 40. Therefore, when the synchronizing rod 51 moves, it will drive the passive rack 54 to move synchronously. Then, the passive rack 54 achieves the synchronous lifting and lowering of the lifting rods 210 by meshing with the drive gear 40, and finally realizes the moving clamping of the clamping plate 211.

[0071] Two sets of drive screws 52 are provided between the two support rods 111. Both ends of the drive screws 52 are mounted on the fixed seats provided on the support rods 111 through bearings. One of the drive screws 52 is equipped with a drive gear 53 through a spline. The synchronizing rod 51 has a rack segment that meshes with the drive gear 53. When the drive screw 52 is turned to rotate, the drive gear 53 on it meshes with the rack segment of the synchronizing rod 51 to drive the movement of the synchronizing rod 51, thereby realizing the lifting control of the lifting rod 210.

[0072] Reference Figure 9 and Figure 10 As shown, the structural schematic diagram of clamping plate 3 221 is as follows: Specifically, clamping claw 3 22 includes sliding shafts 220 symmetrically arranged on the U-shaped frame 110 along the width direction of the positioning frame 1. The two sliding shafts 220 pass through the U-shaped frame 110, and the corresponding ends are hinged to clamping plate 3 221.

[0073] The two sliding shafts 220 are arranged opposite each other, and their axes are on the same horizontal line. When the two clamping plates 221 are close to each other, they can clamp the pipe in the width direction of the positioning frame 1.

[0074] Furthermore, the clamping claw 22, together with the aforementioned clamping claw 20 and clamping claw 21, constitutes a complete annular clamping system. Clamping claw 20 and clamping claw 21 are responsible for the longitudinal positioning of the pipeline, while clamping claw 22 is responsible for the lateral positioning of the pipeline. The three work together to form an all-round covering and support for the pipeline. Especially when welding bent pipes, this multi-directional clamping can effectively resist the forces and torques generated in various directions during the welding process, ensuring the stability of the pipeline position.

[0075] Reference Figure 9 and Figure 10 The diagram shows the structure for controlling the movement of clamping plate 3 221. Specifically, the positioning frame 1 is equipped with a control component 6 for controlling the relative movement of the two clamping plates 3 221. The control component 6 includes a fixed rod 60 symmetrically arranged along the base 10. The fixed rod 60 has a receiving groove, which extends along the axis of the drive screw 52. A synchronous screw 61 is rotatably installed in the receiving groove. The synchronous screw 61 is rotatably set in the receiving groove through a bearing. The two synchronous screws 61 are connected by a belt drive. One of the synchronous screws 61 is driven by a motor. A movable seat 62 that slides in the receiving groove is symmetrically installed on the synchronous screw 61 by threads. A movable rod 63 is symmetrically installed on the drive screw 52 by threads. The end of the movable rod 63 away from the drive screw 52 is connected to the movable seat 62 by a snap-fit ​​component 64.

[0076] The fixing rods 60 are arranged parallel to each other on both sides of the base 10. The internal receiving grooves have a rectangular cross-section, providing precise guidance for the moving seats 62. The synchronizing screw 61 adopts a bidirectional thread design, with a smooth shaft section in the middle and external threads with opposite directions machined at both ends, forming a threaded engagement with the two moving seats 62. When the synchronizing screw 61 rotates, the two moving seats 62 move towards or away from each other within the receiving grooves.

[0077] When it is necessary to adjust the distance between the two clamping plates 321, the synchronous screw 61 is rotated. Due to the bidirectional thread design of the synchronous screw 61, the two moving seats 62 move synchronously towards or away from each other in the receiving groove, and the clamping plates are driven by the moving rod 63 to achieve symmetrical movement. This symmetrical movement mechanism ensures that the pipeline is always in the center position and avoids pipeline offset caused by asymmetrical clamping.

[0078] Reference Figure 9 and Figure 10 The diagram shows the structure of the fixed movable seat 62 and the movable rod 63. Specifically, the snap-fit ​​component 64 includes an L-shaped snap-fit ​​block 640. The movable seat 62 has a positioning groove 641 that extends through the inside and outside. The snap-fit ​​block 640 is slidably disposed in the positioning groove 641 along its length direction via a telescopic rod. The movable rod 63 has a T-shaped mating groove 642 on one side wall near the movable seat 62. The snap-fit ​​block 640 is movably snapped into the mating groove 642.

[0079] The L-shaped snap-fit ​​block 640 consists of a horizontal snap-fit ​​part and a vertical guide part. The end of the horizontal snap-fit ​​part is provided with a guide slope to facilitate the insertion and docking with the mating groove 642.

[0080] When it is necessary to connect the locking block 640 and the movable seat 62, the mating groove 642 will gradually approach the locking block 640 during the descent of the movable rod 63. Under the action of the mating groove 642, the two locking blocks 640 will gradually approach each other and enter the vertical section of the T-shaped groove. After they are fully in, the locking block 640 will enter the horizontal section of the T-shaped groove under the action of the telescopic rod.

[0081] The telescopic rod includes a compression spring and a guide rod. The compression spring always provides an outward thrust to the locking block 640, ensuring that the locking block 640 and the mating groove 642 remain tightly engaged.

[0082] This invention achieves arrayed coordination of multiple positioning frames 1 through a synchronization unit 3. By adjusting the length of the multi-stage telescopic rod 30 and the rotation angle of the mating block 32, it flexibly adapts to the spatial positioning requirements of straight or curved pipe welding. The clamping unit 2 achieves automatic pipe centering through the coordinated action of three sets of clamping claws: clamping claw one 20 achieves synchronous vertical movement on both sides via belt drive; clamping claw two 21 achieves synchronous reverse vertical movement on both sides via gear rack and screw drive, together with clamping claw one 20, to determine the vertical center of the pipe; clamping claw three 22 is driven by a bidirectional threaded synchronous screw 61 to achieve synchronous horizontal movement on both sides towards or away from each other, determining the horizontal center of the pipe. The final intersection point of the three is the theoretical axis of the pipe, thus achieving automatic centering and stable enveloping clamping without repeated manual adjustments.

[0083] Example 2:

[0084] Based on Embodiment 1, in order to further improve the stability of the U-shaped frame 110, a fixing member 7 is also proposed, which is conducive to fixing the U-shaped frame 110, ensuring the stability of pipe clamping during welding and positioning, ensuring welding stability, and improving welding accuracy.

[0085] Reference Figure 11 The diagram shows the structure for fixing the U-shaped frame 110. Specifically, the other end of the fixing base 11 is fixed to the base 10 by a fastener 7. An extension block 70 is connected to the end of the two U-shaped frames 110 away from the hinge. A placement groove is provided on the base 10, and a connecting block 71 is slidably disposed in the placement groove through a spring. The end of the connecting block 71 near the extension block 70 is arc-shaped, and a snap-fit ​​groove is provided on the extension block 70 to engage with the connecting block 71.

[0086] When the U-shaped frame 110 needs to be fixed, the U-shaped frame 110 rotates as a whole, and the extension block 70 at the end away from the hinge gradually aligns with the placement slot entrance of the base 10. Then, the guide slope of the extension block 70 interacts with the guide arc surface of the docking block 71, pushing the docking block 71 to retract into the placement slot. When the extension block 70 is fully in place, the docking block 71 automatically pops out under the action of the return spring and inserts into the snap-fit ​​slot of the extension block 70. At the same time, the locking mechanism automatically takes effect, completing the reliable connection between the fixing seat 11 and the base 10.

[0087] During operation: First, move the device to the position of the pipe to be welded using the universal wheels with brakes at the bottom of the base 10, and lock the brake fixing device; if multiple devices need to work together, use the mating block 32 of the synchronization unit 3 to dock with the positioning block 34 to form a working array. For welding long straight pipes, ensure coaxiality, and for welding bent pipes, adjust the horizontal angle.

[0088] Step 2: According to the pipe placement requirements, the U-shaped bracket 110 can be opened or closed through the fastener 7. When closed, the extension block 70 pushes the docking block 71 to retract and automatically lock in place.

[0089] Step 3: Perform preliminary pipe positioning. Place the welding ends of the two pipes to be welded at both ends of the base 10 to ensure initial alignment at the joint. Then, perform clamping adjustment. In the height direction, rotate the drive shaft 201 of the clamping claw 20, which synchronously drives the clamping plates 200 on both sides to rise and fall via belt drive.

[0090] Step 4: Start the motor of clamping claw 21, which, through the transmission mechanism, causes the two clamping plates 211 to rise and fall synchronously, cooperating with clamping plate 200 to fit against the pipe from the top and bottom. In the width direction, start the motor of clamping claw 22, which, through the synchronous screw 61, drives the two clamping plates 221 to move synchronously towards each other, fitting against the pipe from the left and right, and finally forming a ring-shaped covering with the previous two.

[0091] Step 5: Welding is carried out. For long straight pipes, the multi-stage telescopic rod 30 of the synchronization unit 3 ensures that multiple devices are coaxial. For bent pipes, the direction is adjusted by rotating the mating block 32. The clamping unit 2 is tightened synchronously to prevent pipe displacement and ensure welding accuracy.

[0092] Step 6: After welding is completed, adjust each clamping unit 2 in the reverse direction to loosen the clamps, separate the multi-device collaborative array, and release the universal wheel brake to remove the device.

[0093] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0094] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects.

[0095] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A municipal heating pipeline welding positioning device, comprising a positioning frame, characterized in that: The positioning frame includes a base and a fixing seat. The fixing seat includes two sets of U-shaped frames, which are connected by a support rod. The positioning frame is equipped with: A clamping unit for positioning and fixing pipelines; A synchronization unit that facilitates the coordinated operation of multiple positioning frames; The synchronization unit includes a multi-stage telescopic rod horizontally set at the bottom of the fixed base. The telescopic end of the multi-stage telescopic rod is provided with a bearing plate. A mating block is rotatably installed on the bearing plate. A fixed block is placed at the end of the fixed base away from the mating block in the length direction. A positioning block is slidably installed inside the fixed block. A mating groove with the same shape as the mating block is opened on the positioning block. The clamping unit includes clamping jaw one and clamping jaw two that can slide along the height direction of the positioning frame, and two sets of clamping jaw three that can slide along the width direction of the positioning frame; The second clamping claw includes a lifting rod that is slidably disposed on the top of the girder. The lifting rod passes through the girder and is hinged to the second clamping plate at one end near the first clamping plate. A control component for controlling the lifting and lowering of the two clamping plates is installed between the tops of the two girder frames. The control component includes a drive gear, which is rotatably installed on the top of the girder frame and sleeved on the outside of the lifting rod and threadedly connected to the lifting rod. The lifting rod has a limiting groove extending along its axis on its side wall, and the top of the U-shaped frame has a through hole for the lifting rod to pass through, and a limiting block is fixed in the through hole to guide the sliding of the limiting groove. The frame is also equipped with a synchronizing element to control the synchronous rotation of the two drive gears; the synchronizing element includes an extension rod fixedly connected between the tops of the two frames, a synchronizing rod slidingly provided along the axial direction of the extension rod, and a driven rack fixedly connected to both ends of the synchronizing rod, the driven rack meshing with the drive gear; Two sets of drive screws are provided between the two support rods. Both ends of the drive screws are mounted on the fixed seats provided on the support rods via bearings. One of the drive screws is equipped with a drive gear via a spline, and the synchronizing rod has a rack segment that meshes with the drive gear. The clamping claw three includes sliding shafts symmetrically arranged on the U-shaped frame along the width direction of the positioning frame. The two sliding shafts pass through the U-shaped frame, and a clamping plate three is hinged to one end of the corresponding shaft. The positioning frame is equipped with control components that control the relative movement of the two clamping plates. The control components include fixed rods symmetrically arranged along the base, and receiving grooves extending along the axis of the drive screw; The fixed rod has a receiving groove, and a synchronous screw is rotatably installed in the receiving groove. The synchronous screw has a sliding seat that slides in the receiving groove and is symmetrically installed on the threaded part. The drive screw has a sliding rod that is symmetrically installed on the threaded part. The end of the sliding rod away from the drive screw is connected to the sliding seat through a snap-fit ​​design. The snap-fit ​​component includes an L-shaped snap-fit ​​block. The movable base has a positioning groove that extends through the inside and outside. The snap-fit ​​block is slidably installed in the positioning groove along its length via a telescopic rod. The side wall of the movable rod near the movable base has a T-shaped mating groove. The snap-fit ​​block is movably snapped into the mating groove.

2. The municipal heating pipeline welding positioning device according to claim 1, characterized in that: The clamping claw includes a clamping plate symmetrically arranged along the length of the fixed base. The fixed base has mounting grooves symmetrically opened along its length. A drive shaft is rotatably arranged in the mounting groove. A drive groove is rotatably opened in the drive shaft. A clamping rod is threadedly connected in the drive groove. The clamping plate is hinged to one end of the clamping rod located outside the drive groove.

3. A method for welding and positioning municipal heating pipelines, employing a municipal heating pipeline welding and positioning device as described in any one of claims 1-2, characterized in that: The welding positioning method is as follows: S1. Equipment preparation: Move the positioning frame to the pipe welding position using the casters with brakes and lock it. S2. Preliminary Alignment: Place the welding ends of the two pipe sections to be welded at both ends of the base to preliminarily align the joints. S3. Pipe fixing: Operate the clamping unit to make clamping claw one and clamping claw two clamp the pipe synchronously from the top and bottom, and clamping claw three clamp the pipe from the width direction, thereby forming a ring-shaped covering and fixing of the pipe. S4. Coordinated Positioning and Welding: For straight pipelines, the multi-stage telescopic rods in the synchronization unit of multiple positioning frames are adjusted to ensure that all pipelines are in the same straight line; for bent pipelines, the horizontal angle between adjacent positioning frames is adjusted by rotating the mating block and adjusting the multi-stage telescopic rods, so that the pipeline is positioned according to the preset direction, and then welding is performed.

Images