Tensioning device of pipeline aligning device

Abstract

A tensioning device of a pipeline aligning device comprises a hydraulic cylinder, the inner wall of a cylinder body can make contact with a piston of a piston rod in an attached mode, and a center hole of a front end cover of the hydraulic cylinder and a center hole of a rear end cover of the hydraulic cylinder can make contact with a rod body of the piston rod in an attached mode. The front end of the piston rod extends out of the front end cover; the center of the hinge seat is connected with the front end of the piston rod; two ends of the shield are respectively a small-diameter end and a large-diameter end, the small-diameter end is connected with the end face of the front end cover, the large-diameter end is connected with the distribution disc, and a straight tube section is arranged between the small-diameter end and the large-diameter end; one end of the distribution disc is connected with the large-diameter end of the protective cover, a plurality of radial through holes are formed in the circumferential direction of the distribution disc at intervals, and ejector rods are movably arranged in the radial through holes; the other end of the connecting rod is rotationally connected with the ejector rod; and the tensioning pressing block is fixed on the ejector rod. The device is simple and light in structure, easy to assemble and capable of effectively reducing product cost and improving production efficiency of products.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline construction technology, specifically relating to a tensioning device for a pipeline alignment tool. Background Technology

[0002] In pipeline construction, pipe alignment tools are used to align the ends of two pipes for welding. Pipe alignment tools contain a tensioning device that tightens and rounds the pipe ends, ensuring a proper connection. Currently, the tensioning device on pipe alignment tools has various structures, one of which is... Figure 1 As shown, the piston rod 3 is a hollow rod, sleeved on a guide sleeve 5. The guide sleeve 5 is connected to the positioning plate 6 to achieve relative positional fixation. The outer diameter surface of the piston rod 3 slides along the center hole of the cylinder bottom of the hydraulic cylinder 2. Thus, the guide sleeve 5 acts as the inner guide structure, and the center hole of the cylinder bottom acts as the outer guide structure. Together, they provide guidance for the movement of the piston rod 3. The movement of the piston rod 3 drives the connected pressure block to expand and contract radially along the distribution plate 4, tightening and aligning the pipe opening. In actual use, this tightening structure is relatively complex, with many parts, high precision requirements for part machining, and a cumbersome assembly process. It also requires high precision in the installation of the guide sleeve, resulting in high product cost and low production efficiency. In addition, the distribution plate is directly mounted on the hydraulic cylinder, making the cylinder diameter of the hydraulic cylinder and the outer diameter of the distribution plate not much different. Therefore, to achieve a small stroke distance for the pressure block, the diameters of the distribution plate and the hydraulic cylinder need to be larger, increasing the overall size and weight of the device. Utility Model Content

[0003] The purpose of this invention is to provide a tensioning device for a pipe alignment device. This device has a simple and lightweight structure, is easy to assemble, and does not require an internal guide structure, thus effectively reducing product costs and improving production efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a tensioning device for a pipe alignment device, including a hydraulic cylinder, wherein the inner wall of the hydraulic cylinder can be in close contact with the outer diameter surface of the piston on the piston rod, and the center hole of the front end cover and the center hole of the rear end cover of the hydraulic cylinder can be in close contact with the rod body of the piston rod.

[0005] A piston rod, wherein the piston is disposed in the middle of the rod body, and the front end of the piston rod extends out from the front end cover;

[0006] The hinge seat is disc-shaped, and its center is connected to the front end of the piston rod;

[0007] The protective cover has a small diameter end and a large diameter end at its two ends. The small diameter end is connected to the end face of the front cover, and the large diameter end is connected to the distribution plate. The section between the small diameter end and the large diameter end is a straight cylinder.

[0008] The distribution plate has a connecting end at one end, which is connected to the large-diameter end of the protective cover. Multiple radial through holes are arranged at intervals in the circumferential direction of the distribution plate, and a push rod is movably installed in the radial through holes.

[0009] The connecting rod has one end rotatably connected to the outer diameter surface of the hinge seat, and the other end rotatably connected to the bottom end of the top rod;

[0010] The tensioning block is fixed to the top of the top rod.

[0011] Multiple grooves are spaced circumferentially on the outer diameter surface of the hinge seat, and the end of the connecting rod is rotatably connected in the grooves.

[0012] The top rod has a chamfer on the side facing the distribution plate connection end.

[0013] At least one sealing ring is provided on the inner wall of the central hole of the front cover, the inner wall of the central hole of the rear cover, and the outer diameter surface of the piston.

[0014] The outer diameter surface of the tensioning block is arc-shaped and matches the inner wall shape of the pipe that needs to be aligned.

[0015] The tensioning block is provided with a radially extending countersunk hole, and the top end of the push rod is provided with a threaded hole. The bolt passes through the countersunk hole and connects with the threaded hole of the push rod.

[0016] The beneficial effects of this utility model are: the cylinder body, front end cover and rear end cover of the hydraulic cylinder provide guidance for the movement of the piston rod, which can eliminate the internal guide structure in the prior art, reduce the number of parts and simplify the assembly steps.

[0017] The protective cover used in this invention can provide reliable installation support for the distribution plate. Through the near-trumpet-shaped structure of the small-diameter end and the large-diameter end, the tensioning block is brought closer to the inner wall of the pipe, reducing the moving distance of the tensioning block. Consequently, the piston rod needs to move less, which helps to reduce the length of the hydraulic cylinder in the axial direction. Moreover, the front end cover of the hydraulic cylinder is connected to the small-diameter end of the protective cover, making the diameter of the hydraulic cylinder significantly smaller than the outer diameter of the protective cover and the distribution plate, which helps to reduce the weight of the entire device.

[0018] The outer diameter surface of the tensioning block used in this invention is arc-shaped, which can fit and contact the inner wall of the pipe. In this way, multiple tensioning blocks can simultaneously tighten the pipe, which can better play the role of tightening and rounding. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a pipe alignment tensioning device in the prior art;

[0021] Figure 2 This is a schematic diagram of the structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the tensioning block in this utility model;

[0023] The markings in the diagram are: 1. Piston, 2. Hydraulic cylinder, 3. Piston rod, 4. Distribution plate, 401. Limiting hole, 5. Guide sleeve, 6. Positioning plate, 7. Rear end cover, 8. Cylinder body, 9. Front end cover, 10. Protective cover, 101. Small diameter end, 102. Straight cylinder section, 103. Large diameter end, 11. Connecting rod, 12. Push rod, 121. Chamfer, 13. Tensioning block, 1301. Outer diameter surface, 1302. Inner diameter surface, 14. Hinge seat, 15. Sealing ring. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention in any way.

[0025] like Figure 2 As shown, a tensioning device for a pipe alignment tool includes a hydraulic cylinder, a protective cover 10, a hinge seat 14, a distribution plate 4, and multiple tensioning blocks 13.

[0026] The hydraulic cylinder includes a cylinder body 8, a front end cover 9, a rear end cover 7, and a piston rod 3. The front end cover 9 and the rear end cover 7 are connected to both ends of the cylinder body 8 to form the cavity of the hydraulic cylinder. A piston 1 is provided in the middle of the piston rod 3. The outer diameter surface of the piston 1 slides against the inner wall of the cylinder body 8. The piston rod 3 also passes through the central holes of the front end cover 9 and the rear end cover 7, respectively.

[0027] Furthermore, sealing rings 15 are provided on the outer diameter surface of the piston 1, the inner wall of the center hole of the front end cover 9, and the inner wall of the center hole of the rear end cover 7, and multiple sealing rings 15 are provided to ensure the sealing of the hydraulic cylinder cavity.

[0028] One end of the protective cover 10 is a small-diameter end 101, and the other end is a large-diameter end 103. The small-diameter end 101 is provided with a small annular flange extending towards the center, and the large-diameter end 103 is provided with a large annular flange extending away from the center. A straight cylindrical section 102 connects the small-diameter end 101 and the large-diameter end 103. The small-diameter end 101 of the protective cover 10 is fixed to the end face of the front cover 9 of the hydraulic cylinder by the small annular flange. An annular distribution plate 4 is fixedly provided on the end face of the large annular flange of the large-diameter end 103 of the protective cover 10. The distribution plate 4 is provided with multiple radially distributed through holes in the circumferential direction. A push rod 12 is slidably disposed in the radial through holes, and the end of the push rod 12 is connected to the tensioning block 13.

[0029] The hinge seat 14 is disc-shaped, with its center fixedly connected to the front end of the piston rod 3. Multiple grooves are spaced along the circumference of the outer diameter surface of the hinge seat 14. A connecting rod 11 is rotatably connected within each groove, with one end of the connecting rod 11 extending out of the groove and hinged to the top rod 12. The extension and retraction of the piston rod 3 causes the hinge seat 14 to move back and forth, which in turn causes the top rod 12 to retract and extend within the radial through-hole of the distribution plate 4 via the connecting rod 11, thereby achieving the tensioning of the tensioning block 13 on the inner wall of the pipe. When the top rod 12 extends, the tensioning block 13 can act on the inner wall of the pipe opening, tensioning and rounding the pipe opening to facilitate butt welding between pipes.

[0030] Furthermore, the end of the distribution plate 4 used to connect with the protective cover 10 is a connecting end. The end face width of the connecting end is relatively small, resulting in a larger central hole diameter, which is similar to the inner diameter of the straight cylindrical section 102 on the protective cover 10 and larger than the diameter of the hinge seat 14. Thus, as the hinge seat 14 moves with the piston rod 3, it can penetrate deeper into the distribution plate 4 through the larger central hole of the connecting end, allowing the push rod 12 to extend further and the tensioning block 13 to generate a greater tensioning force.

[0031] Furthermore, a chamfer is provided on the side of the push rod 12 facing the connection end of the distribution plate 4 to prevent the push rod 12 from scratching the distribution plate 4 when it retracts.

[0032] Furthermore, the structure of the tensioning block 13 is as follows: Figure 3 As shown, the outer diameter surface 1301 of the tensioning block 13 is an arc surface, and the diameter of the arc surface is the same as the inner diameter of the pipe. In this way, the outer diameter surface 1301 of the tensioning block 13 can fit well with the inner wall of the pipe, and the contact area is large. The simultaneous action of multiple tensioning blocks 13 can achieve a good tensioning and rounding effect on the pipe opening. The tensioning block 13 is provided with a radially extending countersunk hole, and the top end of the push rod 12 is provided with a threaded hole. The bolt passes through the countersunk hole and connects with the threaded hole of the push rod 12 to fix the tensioning block 13 to the push rod 12.

[0033] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the specific implementation of this utility model with reference to the above embodiments. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model are within the protection scope of the pending claims.

Claims

1. A tensioning device for a pipe alignment fitting, characterized in that: Including a hydraulic cylinder, the inner wall of the hydraulic cylinder can fit in contact with the outer diameter surface of the piston on the piston rod, and the center holes of the front end cap and the rear end cap of the hydraulic cylinder can fit in contact with the rod body of the piston rod. A piston rod, wherein the piston is disposed in the middle of the rod body, and the front end of the piston rod extends out from the front end cover; The hinge seat is disc-shaped, and its center is connected to the front end of the piston rod; The protective cover has a small diameter end and a large diameter end at its two ends. The small diameter end is connected to the end face of the front cover, and the large diameter end is connected to the distribution plate. The section between the small diameter end and the large diameter end is a straight cylinder. The distribution plate has a connecting end at one end, which is connected to the large-diameter end of the protective cover. Multiple radial through holes are arranged at intervals in the circumferential direction of the distribution plate, and a push rod is movably installed in the radial through holes. The connecting rod has one end rotatably connected to the outer diameter surface of the hinge seat, and the other end rotatably connected to the bottom end of the top rod; The tensioning block is fixed to the top of the top rod.

2. The tensioning device according to claim 1, characterized in that: Multiple grooves are spaced circumferentially on the outer diameter surface of the hinge seat, and the end of the connecting rod is rotatably connected in the grooves.

3. The tensioning device according to claim 1, characterized in that: The top rod has a chamfer on the side facing the distribution plate connection end.

4. The tensioning device according to claim 1, characterized in that: At least one sealing ring is provided on the inner wall of the central hole of the front cover, the inner wall of the central hole of the rear cover, and the outer diameter surface of the piston.

5. The tensioning device according to claim 1, characterized in that: The outer diameter surface of the tensioning block is arc-shaped and matches the inner wall shape of the pipe that needs to be aligned.

6. The tensioning device according to claim 1, characterized in that: The tensioning block is provided with a radially extending countersunk hole, and the top end of the push rod is provided with a threaded hole. The bolt passes through the countersunk hole and connects with the threaded hole of the push rod.

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