PE gas pipe correction clamp

Abstract

The utility model relates to gas pipe correction technical field especially, it relates to a kind of PE gas pipe correction clamp, solve the problem that the pipe wall is prone to local indentation, flattening or stress concentration, and new plastic deformation is easily caused in the clamping area of pipe body when only applying correction force from outside in prior art due to the certain flexibility and elasticity of PE material.A kind of PE gas pipe correction clamp, including frame, both sides of frame are fixedly connected with side plate, and the opposite side of two side plates is equipped with arc clamping plate, and the bottom of two arc clamping plates is slidably connected between the bottom of frame, both sides of frame are equipped with support rod, and the one end of two support rods is respectively through both sides of frame.The utility model effectively solves the problem that pipe wall is prone to flattening, indentation or uneven stress due to lack of inside support in existing correction clamp, realizes the simultaneous support and uniform stress of inside and outside of PE gas pipe.

Description

Technical Field

[0001] This utility model relates to the field of gas pipe straightening technology, and in particular to a PE gas pipe straightening clamp. Background Technology

[0002] PE gas pipe straightening is a crucial step in the construction and maintenance of polyethylene gas pipelines. It primarily addresses PE gas pipe sections that have become bent, deformed, or under uneven stress due to transportation, storage, or installation. By applying reverse forces or constraints, it restores the pipes to a straight state, ensuring that the pipe ends are flat and the axes are aligned during connection. This guarantees the quality and sealing of heat-fusion or electrofusion connections, preventing safety hazards such as leaks and pipe bursts caused by misalignment or excessive gaps. PE gas pipes play a vital role in urban gas transmission and distribution systems. As underground buried high-pressure or medium-pressure main or branch pipes, the reliability of their connections and overall straightness have a decisive impact on the operational safety, service life, and gas supply stability of the pipeline network.

[0003] Specifically, during emergency repairs, existing PE gas pipes may become misaligned at the center due to external forces or pipe deformation. Current technology typically uses tools like pry bars to forcibly align the pipe. However, using pry bars during emergency repairs is not only time-consuming and labor-intensive but also causes wear and damage to the PE gas pipes, affecting their normal use. Furthermore, when applying straightening force only from the outside, the pipe wall is prone to localized indentation, flattening, or stress concentration, especially when straightening larger diameter or thin-walled PE pipes. This unilateral force pattern easily leads to new plastic deformation in the clamping area, exacerbating out-of-roundness or local instability. Simultaneously, the lack of an internal support structure makes it impossible to effectively resist the inward buckling tendency of the pipe wall during straightening, resulting in uneven force transmission and difficulty in achieving uniform restoration of the entire pipe, affecting the final straightness and roundness accuracy. Therefore, to address the many shortcomings of existing technologies, we urgently need an innovative PE gas pipe straightening clamp to solve these problems. Utility Model Content

[0004] The purpose of this invention is to provide a PE gas pipe straightening clamp, which solves the problem that in the prior art, due to the flexibility and elasticity of PE material, when straightening force is applied only from the outside, the pipe wall is prone to local indentation, flattening or stress concentration. Especially when straightening larger diameter or thin-walled PE pipes, this unilateral force mode can easily cause new plastic deformation of the pipe body in the clamping area, which in turn aggravates the problem of out-of-roundness or local instability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A PE gas pipe straightening clamp includes a frame, with side plates fixedly connected to both sides of the frame. Each side plate has an arc-shaped clamp on its opposite side, and the bottoms of the two arc-shaped clamps are slidably connected to the bottom of the frame. Support rods are provided on both sides of the frame, with one end of each support rod penetrating through both sides of the frame. A top frame is fixedly connected to the top of the frame, and a drive motor is bolted to one side of the outer wall of the top frame. A bidirectional screw is rotatably connected to the inner side of the top frame, with one end of the bidirectional screw penetrating through the side wall of the top frame and connected to the output shaft of the drive motor. Nut seats are threaded to both ends of the bidirectional screw, and one side of each nut seat is fixedly connected to one end of each support rod. A cylinder is bolted to one side of each of the two side plates, and the output shaft of the cylinder is fixedly connected through the side plate to one side of the arc-shaped clamp.

[0006] Preferably, the bottom of each of the two arc-shaped clamps is fixedly connected to a sliding block, and the sliding block is slidably connected to the bottom of the frame through a sliding groove.

[0007] Preferably, the top of each of the two nut seats is fixedly connected to a slider, and the two sliders are slidably connected to the top of the top frame through a groove.

[0008] Preferably, a connecting rod is fixedly connected to one side of each of the two nut seats, and the extended ends of the two connecting rods are fixedly connected to one end of each of the two support rods.

[0009] Preferably, one end of the bidirectional screw is rotatably connected to the inner wall of the top frame via a rotating shaft, and the other end of the bidirectional screw passes through the side wall of the top frame via a bearing sleeve.

[0010] Preferably, slots are provided on both sides of the frame, and one end of each of the two support rods passes through the slots through the side wall of the frame.

[0011] This utility model has the following beneficial effects: By using cylinder-driven arc-shaped clamps on both sides of the frame to clamp and fix the outer wall of the PE gas pipe, and combining this with a drive motor to rotate a bidirectional screw, which in turn pushes a support rod through a nut seat to radially support the pipe from the inside, this structural design effectively solves the problem of existing straightening clamps lacking internal support, which can easily lead to pipe flattening, denting, or uneven force distribution. It achieves simultaneous support and uniform force distribution on both the inner and outer sides of the PE gas pipe, significantly improving structural stability and force balance during the straightening process. The arc-shaped clamps' contact with the outer wall of the pipe increases the force-bearing area, reduces the pressure per unit area, and avoids surface damage caused by rigid clamping. Simultaneously, its bottom slides against the frame, ensuring the linearity and synchronicity of the clamping action. Driven by the bidirectional screw and nut seat, the support rod achieves bidirectional synchronous feed, ensuring symmetrical application of the supporting force on both sides, preventing pipe displacement or new bending due to unilateral support, and improving straightening accuracy. The electric motor provides stable power output, and in conjunction with the threaded transmission mechanism, the feed speed and force of the support rod are adjustable, adapting to PE gas pipes of different diameters, wall thicknesses, and degrees of deformation, thus enhancing the versatility and adaptability of the clamp. The cylinder, as the external clamping power source, responds quickly and has controllable clamping force. Working in conjunction with the internal support structure, it forms a complete internal and external constraint system, effectively resisting the springback or buckling tendency of the PE pipe due to material elasticity during the straightening process, ensuring the roundness and straightness of the pipe body after straightening. The entire device has a compact structure and a high degree of automation, reducing the uncertainty and labor intensity of manual operation, improving the efficiency and consistency of the straightening operation, and avoiding quality problems such as misaligned joints and welding defects caused by poor straightening. This enhances the safety and sealing reliability of PE gas pipe connections, meeting the stringent requirements of modern gas pipeline engineering for construction quality, operational efficiency, and safety standards, and has good practical value and promising prospects for promotion. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a top view of the structure of this utility model; Figure 4 This is a schematic diagram of the support rod structure of this utility model; Figure 5 This is a schematic diagram of the top frame and its structure of the present invention.

[0014] In the diagram: 1. Frame; 2. Side plate; 3. Arc-shaped clamp; 4. Cylinder; 5. Support rod; 6. Slot; 7. Top frame; 8. Two-way screw; 9. Nut seat; 10. Slider; 11. Slide groove; 12. Drive motor; 13. Connecting rod; 14. Sliding block; 15. Sliding groove. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0016] Reference Figure 1-5 A PE gas pipe straightening clamp includes a frame 1, with side plates 2 fixedly connected to both sides of the frame 1. Each side plate 2 has an arc-shaped clamp 3 on its opposite side, and the bottoms of the two arc-shaped clamps 3 are slidably connected to the bottom of the frame 1. Support rods 5 are provided on both sides of the frame 1, with one end of each support rod 5 penetrating through both sides of the frame 1. A top frame 7 is fixedly connected to the top of the frame 1, and a drive motor 12 is bolted to one side of the outer wall of the top frame 7. A bidirectional screw 8 is rotatably connected to the inner side of the top frame 7, with one end of the bidirectional screw 8 penetrating through the side wall of the top frame 7 and connected to the output shaft of the drive motor 12. Nut seats 9 are threadedly connected to both ends of the bidirectional screw 8, and one side of each nut seat 9 is fixedly connected to one end of each support rod 5. A cylinder 4 is bolted to one side of each side plate 2, and the output shaft of the cylinder 4 is fixedly connected through the side plate 2 to one side of the arc-shaped clamp 3.

[0017] When straightening PE gas pipes that have bent or deformed due to transportation or installation is required, the operator first pushes the pipe section to be straightened horizontally into the inner area of ​​frame 1, aligning its axis roughly with the center of frame 1. Then, the cylinders 4 fixed to the side plates 2 are activated. The output shafts of cylinders 4 push the arc-shaped clamps 3 connected to them to move inward along the sliding structure at the bottom of frame 1. The two arc-shaped clamps 3 simultaneously approach and fit against the two sides of the outer wall of the PE gas pipe. Stable clamping is achieved through the matching contact between the arc-shaped surfaces and the outer surface of the pipe, providing external support and preventing the pipe from bending. Lateral displacement or rolling occurs during the correction process; after the outer clamping is completed, the drive motor 12, which is fixed to the outer wall of the top frame 7 by bolts, is started. The output shaft of the drive motor 12 drives the bidirectional screw 8, which runs through the side wall of the top frame 7, to rotate. The two ends of the bidirectional screw 8 are respectively connected to nut seats 9 by threaded engagement. As the screw rotates, the two nut seats 9 move synchronously in opposite directions, one to the left and the other to the right. Since one side of each of the two nut seats 9 is fixedly connected to the support rods 5 that run through both sides of the frame 1, the two support rods 5 are driven to move simultaneously from both sides of the frame 1. As the support rod 5 advances along the central axis, its end gradually extends into the inner cavity of the PE gas pipe and continues to apply radial support force after contacting the inner wall of the pipe, achieving uniform support inside the pipe. At this time, the PE gas pipe is constrained and supported on the outside by the arc-shaped clamp 3, and the inside is supported by the support rod 5 with a reverse support force. The inner and outer sides form a counter-force structure, effectively balancing the stress on the pipe wall during the correction process and avoiding local flattening, denting, or instability caused by unilateral force. As the support rod 5 continues to advance inward, the pipe gradually restores its original roundness under the synergistic effect of the inner and outer sides. The clamp ensures straightness, especially in areas with bending or elliptical deformation. It can precisely control the straightening force by adjusting the clamping force of cylinder 4 and the speed of drive motor 12, ensuring a smooth and controllable straightening process. After straightening, drive motor 12 reverses, causing support rod 5 to retract and exit the pipe. At the same time, cylinder 4 returns, causing arc-shaped clamp 3 to loosen. The operator can then remove the straightened PE gas pipe from frame 1 to prepare for the next pipe section. The entire process is seamless and requires no frequent manual intervention, making it suitable for continuous operations at construction sites or prefabrication sites.

[0018] Furthermore, each of the two arc-shaped clamping plates 3 is fixedly connected to a sliding block 14 at its bottom, and the sliding block 14 is slidably connected to the bottom of the frame 1 through a sliding groove 15. When the cylinder 4 drives the arc-shaped clamping plate 3 to move inward or outward, the sliding block 14 slides along the limited trajectory of the sliding groove 15. The sliding groove 15 guides and limits the sliding block 14, effectively preventing the arc-shaped clamping plate 3 from deflecting, jamming, or leaving the predetermined path during the movement, ensuring that the two arc-shaped clamping plates 3 move closer or further away synchronously and smoothly, improving the straightness and stability of the clamping action, and achieving the effect of enhancing the movement accuracy and operational reliability of the external clamping structure.

[0019] Furthermore, each of the two nut seats 9 is fixedly connected to a slider 10, and both sliders 10 are slidably connected to the top of the top frame 7 through a groove 11. When the bidirectional screw 8 rotates and drives the nut seat 9 to move along the thread direction, the slider 10 slides synchronously in the groove 11. The groove 11 provides lateral constraint for the slider 10, restricting its rotational freedom and preventing the nut seat 9 from rotating with the bidirectional screw 8 during the thread transmission process. This ensures that the nut seat 9 can only move linearly along the axial direction, thereby ensuring that the pushing action of the support rod 5 is smooth and accurate, avoiding force transmission failure or structural interference caused by the rotation of the nut seat 9, and achieving the effect of improving transmission stability and motion guidance accuracy.

[0020] Furthermore, each of the two nut seats 9 is fixedly connected to one side with a connecting rod 13, and the extended ends of the two connecting rods 13 are fixedly connected to one end of the two support rods 5 respectively. When the nut seat 9 is driven by the bidirectional screw 8 to generate axial displacement, the movement is effectively transmitted to the support rod 5 through the connecting rod 13, realizing the linkage control of the internal support action. The connecting rod 13, as an intermediate connecting part, enhances the maintainability and assembly flexibility of the structure, making it easy to replace the support rod 5 or nut seat 9 separately when damaged. At the same time, it avoids the stress concentration problem that may be caused by the direct rigid connection between the support rod 5 and the nut seat 9, thus achieving the effect of improving the reliability of the transmission connection and the maintainability of the structure.

[0021] Furthermore, one end of the bidirectional screw 8 is rotatably connected to the inner wall of the top frame 7 via a rotating shaft, and the other end of the bidirectional screw 8 passes through the side wall of the top frame 7 via a bearing sleeve, providing a two-end support structure for the bidirectional screw 8. This allows it to have higher coaxiality and rotational stability when rotated by the drive motor 12. The bearing sleeve effectively reduces the frictional resistance between the screw and the top frame 7, while bearing radial loads, preventing the screw from deflecting or vibrating due to the cantilever structure, extending the service life of the transmission components, ensuring the smoothness and accuracy of the threaded transmission, and achieving the effect of enhancing the screw support rigidity and running smoothness.

[0022] Furthermore, slots 6 are provided on both sides of the frame 1, and one end of each of the two support rods 5 passes through the side wall of the frame 1 via the slots 6, providing a guide channel and limiting boundary for the horizontal movement of the support rods 5. The size and shape of the slots 6 match the support rods 5, which can ensure that the support rods 5 slide smoothly and limit their vertical or horizontal displacement, preventing the support rods 5 from tilting or getting stuck due to lateral force during the top support process. At the same time, the structure of the slots 6 enhances the local structural strength of the frame 1, avoids stress concentration at the opening, and achieves the effect of improving the guiding accuracy and structural stability of the support rods 5. In summary: When emergency repairs are needed on bent or deformed PE gas pipes, the operator first pushes the pipe section to be repaired horizontally into the inner area of ​​frame 1, aligning its axis roughly with the center of frame 1. Then, the cylinders 4, bolted to the side plates 2 on both sides, are activated. The output shaft of cylinder 4 pushes the connected arc-shaped clamping plates 3 inward. Since the bottom of the arc-shaped clamping plates 3 is slidably connected to the sliding groove 15 at the bottom of frame 1 via sliding blocks 14, the sliding blocks 14 slide along a straight path within the sliding groove 15, effectively limiting the movement direction of the arc-shaped clamping plates 3 and preventing deflection or jamming. This ensures that the two arc-shaped clamping plates 3 synchronously and smoothly adhere to both sides of the outer wall of the PE gas pipe, achieving stable clamping and providing external support. Force is applied to prevent the tube from rolling or shifting. After the outer clamping is completed, the drive motor 12, which is bolted to the outer wall of the top frame 7, is started. Its output shaft drives the bidirectional screw 8, one end of which passes through the side wall of the top frame 7 via a bearing sleeve, and the other end of which is rotatably connected to the inner wall of the top frame 7 via a rotating shaft. This two-end support structure ensures that the bidirectional screw 8 maintains high coaxiality and smooth operation during rotation, reducing the risk of vibration and deflection. As the bidirectional screw 8 rotates, the nut seats 9, which are threadedly connected at both ends, move synchronously in opposite directions. The top of each nut seat 9 is slidably connected to the slide groove 11 on the top of the top frame 7 via a slider 10. The slider 10 is restricted in its rotational freedom during sliding within the slide groove 11, ensuring that the nut seat 9 can only move axially. Linear movement prevents transmission failure caused by rotation with the screw; the movement of the nut seat 9 is transmitted to the support rod 5 through the connecting rod 13 fixed on one side. The extension end of the connecting rod 13 is fixedly connected to one end of the support rod 5 to achieve stable power transmission. The other ends of the two support rods 5 pass through the side walls of the frame 1 through slots 6 opened on both sides of the frame 1, and move synchronously towards the central axis along the guide path of the slots 6 during the advancement process. The slots 6 not only provide a sliding channel for the support rods 5, but also restrict their vertical and horizontal displacement to prevent tilting or jamming due to lateral force during the support process; as the support rods 5 gradually extend into the inner cavity of the PE gas pipe and support the inner wall, the constraint of the outer arc-shaped clamp 3 and the reaction of the inner support rods 5 on the pipe body Under the upward support, an internal and external opposing force structure is formed, effectively balancing the stress distribution and avoiding local flattening, denting, or instability of the pipe wall due to unilateral force. Under the synergistic action of the controllable speed of the drive motor 12 and the adjustable clamping force of the cylinder 4, the straightening force is precisely controlled, ensuring that the pipe body smoothly restores its roundness and straightness during the force process. After the straightening is completed, the drive motor 12 reverses, the bidirectional screw 8 rotates in the opposite direction to drive the nut seat 9 to retract, and the support rod 5 is pulled out of the pipe along the slot 6 through the connecting rod 13. At the same time, the cylinder 4 returns, causing the arc-shaped clamp 3 to smoothly return to its original position with the cooperation of the sliding block 14 and the sliding groove 15, releasing the clamp. The operator can then take out the straightened PE gas pipe and prepare for the processing of the next workpiece.The arc-shaped clamping plate 3, driven by cylinder 4, clamps the outer wall of the pipe. Combined with the drive motor 12 rotating the bidirectional screw 8, and the support rod 5 being pushed from the inner side of the pipe via nut seat 9 and connecting rod 13, this structural design achieves simultaneous support for both the inner and outer sides of the PE gas pipe. This effectively solves the problems of pipe wall deformation and uneven correction caused by traditional clamps that only clamp from the outside. The cooperation between sliding block 14 and sliding groove 15 ensures the linearity and synchronization of the arc-shaped clamping plate 3's movement, improving the stability and reliability of the external clamping action. The bidirectional screw 8, with its two-end support structure, significantly enhances its rotational rigidity and operational smoothness, extending the life of the transmission components. The sliding cooperation between slider 10 and sliding groove 11 effectively prevents the nut seat 9 from rotating during transmission, ensuring axial stability. The device ensures accurate movement; the connecting rod 13, as an intermediate connector, not only achieves reliable power transmission but also improves the maintainability and assembly flexibility of the structure, facilitating component replacement; the slot 6 provides precise guidance and limitation for the support rod 5, preventing it from shifting or getting stuck during the jacking process, while also enhancing the structural strength of the side wall of the frame 1; the entire device, through internal and external synergy, ensures uniform stress on the PE gas pipe during the straightening process, avoiding local stress concentration, significantly improving the roundness, straightness, and structural integrity of the straightened pipe, enhancing the quality and safety of subsequent emergency repair operations, while also being highly automated, easy to operate, adaptable to the emergency repair needs of different pipe diameters, meeting the actual needs of gas pipeline construction for efficient, accurate, and reliable straightening equipment, and possessing good engineering application value.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A PE gas pipe correction clamp comprising a frame (1), characterized in that, The frame (1) is fixedly connected to two side plates (2) on both sides, and each side plate (2) has an arc-shaped clamp (3) on its opposite side. The bottom of each arc-shaped clamp (3) is slidably connected to the bottom of the frame (1). The frame (1) is provided with support rods (5) on both sides, and one end of each support rod (5) passes through both sides of the frame (1). The top of the frame (1) is fixedly connected to a top frame (7), and a drive motor (12) is fixedly connected to one side of the outer wall of the top frame (7) by bolts. The inner side is rotatably connected to a bidirectional screw (8), one end of which passes through the side wall of the top frame (7) and is connected to the output shaft of the drive motor (12). The two ends of the bidirectional screw (8) are connected to nut seats (9) by threaded engagement, and one side of each of the two nut seats (9) is fixedly connected to one end of each of the two support rods (5). One side of each of the two side plates (2) is fixedly connected to a cylinder (4) by bolts, and the output shaft of the cylinder (4) passes through the side plate (2) and is fixedly connected to one side of the arc-shaped clamp (3).

2. The PE gas pipe straightening clamp according to claim 1, characterized in that, The bottom of each of the two arc-shaped clamps (3) is fixedly connected to a sliding block (14), and the sliding block (14) is slidably connected to the bottom of the frame (1) through a sliding groove (15).

3. The PE gas pipe straightening clamp according to claim 1, characterized in that, The top of each of the two nut seats (9) is fixedly connected to a slider (10), and both sliders (10) are slidably connected to the top of the top frame (7) through a groove (11).

4. The PE gas pipe straightening clamp according to claim 1, characterized in that, Each of the two nut seats (9) is fixedly connected to one side of a connecting rod (13), and the extension ends of the two connecting rods (13) are fixedly connected to one end of the two support rods (5).

5. A PE gas pipe straightening clamp according to claim 1, characterized in that, One end of the bidirectional screw (8) is rotatably connected to the inner wall of the top frame (7) through a rotating shaft, and the other end of the bidirectional screw (8) passes through the side wall of the top frame (7) through a bearing sleeve.

6. A PE gas pipe straightening clamp according to claim 1, characterized in that, The frame (1) has slots (6) on both sides, and one end of each of the two support rods (5) passes through the side wall of the frame (1) through the slots (6).

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