HDPE pipeline clamping adjusting device and adjusting method

Abstract

The invention relates to the technical field of HDPE pipeline welding, in particular to an HDPE pipeline clamping adjusting device and an adjusting method.The HDPE pipeline clamping adjusting device comprises a welding strip, the welding strip is used for wrapping joints of adjacent HDPE pipelines, the outer wall of the welding strip is wrapped with a chain, the head end and the tail end of the chain are connected with a clamping component, and the clamping component is connected with the welding strip. And the clamping part is used for adjusting the tightness of the chain. According to the clamping and adjusting device for the HDPE pipeline, the chain is used for tightly holding the welding strip, and the chain and the welding strip form point contact to tightly hold the HDPE pipeline, so that the condition of stress concentration is greatly reduced, the surface integrity of the HDPE pipeline is better protected while the clamping force is kept, and the sealing performance of a welding part is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of HDPE pipeline welding, and in particular to a HDPE pipeline clamping and adjusting device and an adjusting method. Background Art

[0002] HDPE pipe (High Density Polyethylene) has been widely used in water supply and diversion systems, drainage systems and other fields because of its series of excellent properties, such as reliable connection, strong material impact resistance, outstanding crack resistance, aging resistance and corrosion resistance.

[0003] At present, most HDPE pipes are welded by hot melt welding. For example, the Chinese utility model patent with the publication number CN219312042U discloses an inner support and outer clamp device for HDPE pipe welding, which uses a clamp to fix the HDPE pipe. However, for large HDPE pipes (inner diameter ≥3000mm, single-section HDPE pipe deadweight ≥1t), since the welding area of ​​large HDPE pipes is large, if traditional clamps are used to fix the HDPE pipes, the clamps are huge in size, which is easily affected by the brittleness of the HDPE pipes themselves and easily causes stress concentration, resulting in rupture and damage of the HDPE pipes, affecting the welding efficiency. In addition, the large clamps are huge in size and cannot accurately fix the HDPE pipes, which easily leads to poor welding effects of large HDPE pipes and frequent leakage. Large clamps are not easy to move and install during on-site construction, and are not suitable for welding large HDPE pipes. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing HDPE pipe clamping tooling that is not suitable for large HDPE pipes, easily causes damage to the HDPE pipe or loose welding of the HDPE pipe, and is inconvenient for on-site construction, and to provide a HDPE pipe clamping adjustment device and an adjustment method.

[0005] In a first aspect, the present invention provides a HDPE pipe clamping and adjusting device, comprising a welding strip, wherein the welding strip is used to wrap around the joints of adjacent HDPE pipes, the outer wall of the welding strip wraps around a chain, the head end and the tail end of the chain are connected to a clamping component, and the clamping component is used to adjust the tightness of the chain.

[0006] When welding large HDPE pipes, if traditional clamps are used to fix the welding strips, the clamps will inevitably be huge in size. Large clamps hold the welding strips through surface contact. The stress near the tightening point of the clamps with surface contact is the largest when tightened, which easily forms uneven stress distribution on the surface of the pipe, resulting in stress concentration and even pipe rupture. The HDPE pipe clamping and adjusting device provided by the present invention uses a chain to hold the welding strips. The chain and the welding strips form point contact to hold the HDPE pipes, which greatly reduces the stress concentration. While maintaining the clamping force, the surface integrity of the HDPE pipes is better protected, and the service life of the HDPE pipes is improved. The multi-point contact mode of the chain can use the clamping parts to accurately adjust the chain tightness according to actual needs, so that the force on the welding strips on the outer wall of the pipe joints is more uniform. Compared with the structure fixed by the traditional clamp, the flexible point contact of the chain enables the welding strips to fit the pipe joints more closely, reducing the joint displacement problem caused by insufficient or uneven clamping, thereby effectively improving the sealing performance of the welding parts, effectively avoiding the phenomenon of running, bubbling, dripping, and leaking at the welding parts of the HDPE pipes, improving the reliability of welding, and ensuring the safe operation of the pipeline under high pressure conditions.

[0007] When welding large HDPE pipes, large clamps are huge and inconvenient for on-site construction and movement. The chain is smaller in size and lighter in weight, especially suitable for large HDPE pipes (inner diameter ≥ 3000mm) and other scenes with limited construction space, significantly reducing the difficulty of installation and transportation and improving construction efficiency.

[0008] Preferably, the clamping component includes two fixing claws, one of which is connected to the head end of the chain, and the other of which is connected to the tail end of the chain; the two fixing claws are arranged in a mirror image, and the fixing claws include a bottom plate and a vertical plate connected to the bottom plate, the bottom plates of the two fixing claws are arranged opposite to each other and connected by bolts, the vertical plate abuts against the welding strip, and at least two protrusions are arranged on the side of the vertical plate away from the welding strip, and the protrusions can be inserted into the gap of the chain.

[0009] The two fixed claws are connected by bolts, and the distance between the base plates can be flexibly adjusted by adjusting the bolts, thereby quickly adjusting the tightness of the chain, thereby improving the adjustment convenience of the HDPE pipe clamping adjustment device; when in use, the raised portion on the vertical plate is inserted into the gap of the chain, effectively preventing the chain from sliding or falling off during the clamping process, and significantly enhancing the stability of the clamping force.

[0010] Preferably, the fixing claw further includes a fixing bolt, the vertical plate is provided with at least one bolt hole, the position of the bolt hole corresponds to the gap of the chain, and the fixing bolt can be inserted into the bolt hole.

[0011] When in use, the fixing bolt can pass through the gap of the chain and be inserted into the bolt hole. The fixing bolt and the raised part form a double insurance, which further enhances the stability of the chain, effectively prevents the chain from being displaced, loosened or deviated during use, and ensures the reliability of the clamping parts.

[0012] Preferably, at least two thermal fuses are arranged on the surface of the welding strip in contact with the HDPE pipe, and the thermal fuses are wound in a multi-row overlapping manner along the length direction of the welding strip.

[0013] With this setting, at least two thermal fuses are wound in multiple rows on the welding strip in a serpentine shape, so that the thermal fuses are evenly distributed on the welding surface during welding, providing a larger welding area and a higher welding volume, greatly improving the strength of the welding interface, and ensuring that the welding area of ​​the large HDPE pipe is not easy to detach or rupture when subjected to high pressure or high load, thereby improving the overall welding quality. In addition, since the thermal fuses are designed with multiple rows of overlapping windings, higher welding temperature distribution and material fusion can be achieved in a shorter time, thereby significantly improving welding efficiency.

[0014] Preferably, at least two groups of thermal fuses are arranged on the surface where the welding strip contacts the HDPE pipe, one group of thermal fuses includes two thermal fuses, the spacing between two adjacent groups of thermal fuses is 10CM to 15CM, and the spacing between two adjacent thermal fuses in the same group of thermal fuses is 4CM to 6CM.

[0015] The intra-group spacing and inter-group spacing of the thermal fuses are optimized, and the optimized design of the spacing between two adjacent thermal fuses in the same group can effectively improve the welding strength of the local welding area, ensure that each group of thermal fuses forms a solid welding point during the welding process, so that the local area has sufficient strength to withstand higher internal pressure and external force; the reasonable spacing design between two adjacent groups of thermal fuses ensures that the welding strength of the welding strip is evenly distributed as a whole, thereby avoiding the phenomenon of uneven strength of the welding strip along the welding interface, and effectively improving the overall stability of the welding joint.

[0016] Preferably, the position of the chain corresponds to the position of the thermal fuse.

[0017] The design of the corresponding position of the chain and the thermal fuse enables the chain to apply direct pressure to the position of the thermal fuse when holding the welding strip, ensuring that the thermal fuse and the contact surface of the HDPE pipe fit closely. During the welding heating process, this close contact can transfer heat more efficiently, thereby promoting the rapid melting of the thermal fuse and penetrating into the surface of the HDPE pipe, achieving a more solid welding effect; at the same time, this design can fix the position of the thermal fuse during welding, preventing the thermal fuse from shifting due to uneven pressure from the chain or slight deformation of the pipe surface. This precise positioning ensures that the thermal fuse is evenly distributed at the welding interface, thereby avoiding welding defects or uneven strength problems caused by the offset of the thermal fuse position.

[0018] Preferably, the length of one section of the chain is 6CM to 8CM.

[0019] The length of a single section of the chain is optimized. By limiting the length of each section to 6CM to 8CM, the force-bearing area of ​​the chain is effectively divided into multiple small units. In this way, each small unit can exert a clamping force on the welding strip, forming a multi-point contact clamping mode. This design avoids the problem of pressure being concentrated on a single point or a single area, making the pressure exerted by the chain on the welding strip more uniform, thereby ensuring the sealing and stability of the welding strip during the welding process.

[0020] Preferably, it further comprises a plurality of wedge-shaped pieces, wherein the wedge-shaped pieces are located between the chain and the welding strip.

[0021] When the first ends of the chain are connected to the clamping parts, there may be gaps between the first and / or last ends of the chain and the welding strip. When in use, the wedge-shaped piece can be inserted into the gap between the chain and the welding strip. The wedge-shaped design of the wedge-shaped piece can effectively fill these gaps, so that the chain and the welding strip are in close contact. This can prevent the clamping device from loosening due to the existence of the gap and further improve the overall stability of the device.

[0022] In a second aspect, the present invention provides an adjustment method for adjusting the above-mentioned HDPE pipe clamping adjustment device, comprising the following steps:

[0023] S1: Install the welding tape and adjust the position of the welding tape so that the welding tape covers the joint area of ​​the adjacent HDPE pipe;

[0024] S2: Four chains are grouped in pairs around the outer wall of the welding strip, and the position of the chain on the welding strip is adjusted so that the distance between the chain and the edge of the welding strip is ≤3CM, and the distance between two adjacent groups of chains is 14CM~20CM; the head and tail of each chain are connected through the clamping parts, and the chain is gradually tightened to complete the chain pre-tightening;

[0025] S3: Continue to adjust the clamping parts and tighten the chains at intervals until all chains are tightly holding the welding strips, completing the chain clamping adjustment.

[0026] The adjustment method provided by the present invention first adjusts the position of the welding strip to ensure that the welding strip covers the key welding position, laying a foundation for the high efficiency and reliability of subsequent welding; by wrapping the welding strip with four chains in groups of two, and the chain distance from the edge of the welding strip is ≤3CM, it can ensure that the area at the edge of the welding strip is subjected to sufficient clamping force, and avoid the reduction of welding quality due to lack of clamping force in the edge area; setting a reasonable chain spacing can ensure that the surface of the welding strip is uniformly stressed, and avoid the chain being too dense to increase the difficulty of installation, thereby improving the stress effect and installation efficiency of the overall structure; by gradually tightening the chain to complete pre-tightening, it can effectively prevent the stress concentration problem caused by one-time tightening, and avoid deformation or damage of the local area of ​​the welding strip due to excessive force; the gradual pre-tightening method can also balance the stress distribution of various parts of the welding strip, and ensure the stability of the welding area; tightening the chain at intervals can well avoid the chain on one side of the welding strip being too tight, and maximize the fit between the welding strip and the pipe joint area without damaging the welding strip, providing a more stable foundation for subsequent welding operations.

[0027] The adjustment method provided by the present invention enables the chain to be reasonably distributed on the welding strip and uniformly applies the clamping force, so that the welding strip can fit the outer wall surface of the HDPE pipe more closely, ensuring that the welding strip is in full contact with the surface of the HDPE pipe, thereby improving the sealing and strength of the welding interface, and effectively avoiding welding leaks or loose welding during the welding process.

[0028] Preferably, if it is found in S3 that there is still a gap between the chain and the welding strip, a wedge is driven into the gap between the chain and the welding strip until the gap between the chain and the welding strip is eliminated.

[0029] Inserting a wedge into the gap between the chain and the welding strip can effectively eliminate the gap caused by the incomplete fit between the chain and the welding strip. The wedge-shaped structure of the wedge can gradually fill the gap, so that the chain and the welding strip form a closer contact, thereby ensuring that the force on the surface of the welding strip is uniform and avoiding the decline of welding quality caused by insufficient local pressure.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The HDPE pipe clamping and adjusting device provided by the present invention uses a chain to clamp the welding strip, and the chain and the welding strip form point contact to clamp the HDPE pipe, which greatly reduces the stress concentration, better protects the surface integrity of the HDPE pipe while maintaining the clamping force, and improves the service life of the HDPE pipe; the point contact mode of the chain can use the clamping component to accurately adjust the chain tightness according to actual needs, so that the force of the welding strip on the outer wall of the pipe joint is more uniform;

[0032] 2. Compared with the traditional clamp-fixed structure, the HDPE pipe clamping and adjusting device provided by the present invention has a flexible point contact of the chain, which enables the welding strip to fit the pipe joint more closely, reducing the joint displacement problem caused by insufficient or uneven clamping, thereby effectively improving the sealing performance of the welding part, effectively avoiding the phenomenon of running, bubbling, dripping and leakage at the welding part of the HDPE pipe, improving the reliability of welding, and ensuring the safe operation of the pipeline under high pressure conditions.

[0033] 3. The adjustment method provided by the present invention enables the chain to be reasonably distributed on the welding strip and evenly applies the clamping force. The welding strip can fit the outer wall surface of the HDPE pipe more closely, ensuring that the welding strip is in full contact with the surface of the HDPE pipe, thereby improving the sealing and strength of the welding interface and effectively avoiding welding leaks or loose welding during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A diagram showing the use status of the HDPE pipe clamping and adjusting device provided in Example 1;

[0035] Figure 2 This is the front view of the HDPE pipe clamping and adjusting device;

[0036] Figure 3 It is a schematic diagram of the structure of the clamping component;

[0037] Figure 4 It is a partial schematic diagram of the connection between the chain head end and tail end and the clamping component;

[0038] Figure 5 It is a schematic diagram of the welding strip;

[0039] Figure 6 It is a schematic diagram of the two-section chain structure;

[0040] Figure 7 This is a flow chart of the adjustment method provided in Example 2.

[0041] Markings in the figure:

[0042] 1-welding strip, 11-thermal fuse, 2-chain, 3-clamping component, 31-fixing claw, 311-base plate, 312-vertical plate, 313-protrusion, 314-bolt hole, 315-fixing bolt, 4-wedge piece, 100-HDPE pipe. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0044] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0045] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0046] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0047] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0048] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0049] Example 1

[0050] This embodiment provides a HDPE pipe clamping and adjusting device, which is used to fix the pipe joints of large HDPE pipes (inner diameter ≥3000mm, single HDPE pipe weight ≥1t) during electric fusion welding.

[0051] like Figure 1 , Figure 2 As shown, the HDPE pipe clamping and adjusting device provided in this embodiment includes a welding strip 1, and the welding strip 1 is used to wrap the joints of adjacent HDPE pipes 100, as shown in FIG. Figure 2 As shown, the welding strip 1 can be a rectangular strip welding strip, and the welding strip 1 can cover the joints of two adjacent sections of HDPE pipe 100. The length of the welding strip 1 can be just equal to the circumference of the joint of the HDPE pipe 100. It is foreseeable that the length of the welding strip 1 can also be shorter (the shorter part can be filled by welding later) or slightly longer (the longer part can be cut later) than the circumference of the joint of the HDPE pipe 100. The outer wall of the welding strip 1 wraps around the chain 2, and the head and tail ends of the chain 2 are connected to the clamping component 3 to Figure 1 For example, if the upper part of the clamping part 3 is connected to the head end of the chain 2, the lower part of the clamping part 3 is connected to the tail end of the chain 2; similarly, if the upper part of the clamping part 3 is connected to the tail end of the chain 2, the lower part of the clamping part 3 is connected to the head end of the chain 2. The clamping part 3 is used to adjust the tightness of the chain 2, that is, the clamping part 3 can adjust the chain 2 to hold the welding strip 1 tightly or loosen the welding strip 1.

[0052] Specifically, Figure 3 , Figure 4 In this embodiment, the clamping member 3 includes two fixing claws 31 , one fixing claw 31 is connected to the head end of the chain 2 , and the other fixing claw 31 is connected to the tail end of the chain 2 .

[0053] like Figure 3 As shown, the two fixing claws 31 are arranged in an upper and lower mirror image, and the fixing claws 31 include a bottom plate 311 and a vertical plate 312 connected to the bottom plate 311. Specifically, the bottom plate 311 and the vertical plate 312 can be arranged vertically in an L shape. The bottom plates 311 of the two fixing claws 31 are arranged opposite to each other and connected by bolts, such as Figure 3 , Figure 4 As shown, by adjusting the bolts connecting the two bottom plates 311, the distance between the two bottom plates 311 can be quickly adjusted, thereby adjusting the tightness of the chain 2. The vertical plate 312 is in contact with the welding strip 1. Further, as shown in FIG. Figure 4 As shown, the vertical plate 312 can also be configured to be arc-shaped on the side facing the welding strip 1, and the curvature of the arc-shaped vertical plate 312 can match the curvature of the HDPE pipe to further improve the fit between the clamping component 3 and the welding strip 1. Figure 3As shown, at least two protrusions 313 are provided on the side of the vertical plate 312 facing away from the welding strip 1. Figure 4 As shown, the protrusion 313 can be inserted into the gap of the chain 2. When in use, the bolts between the two bottom plates 311 are adjusted to drive the protrusion 313 to gradually tighten the head and tail ends of the chain 2, thereby achieving tightness adjustment of the chain 2.

[0054] The two fixed claws 31 are connected by bolts, and the distance between the base plates 311 can be flexibly adjusted by adjusting the bolts, thereby quickly adjusting the tightness of the chain 2, thereby improving the adjustment convenience of the clamping adjustment device of the HDPE pipe 100; when in use, the raised portion 313 on the vertical plate 312 is inserted into the gap of the chain 2, effectively preventing the chain 2 from sliding or falling off during the clamping process, and significantly enhancing the stability of the clamping force.

[0055] Further, such as Figure 3 , Figure 4 As shown, the fixing claw 31 also includes a fixing bolt 315, and the vertical plate 312 has at least one bolt hole 314. Figure 3 For example, the bolt hole 314 can be opened between the protrusion 313 and the bottom plate 311. The position of the bolt hole 314 corresponds to the gap of the chain 2, and the fixing bolt 315 can be inserted into the bolt hole 314 to Figure 4 For example, Figure 4 The fixed claw 31 in the middle and upper part is connected to the head end of the chain 2. Figure 4 The fixed claw 31 in the middle and lower part is connected to the tail end of the chain 2. Figure 4 The fixing bolt 315 of the fixing claw 31 in the middle upper part is inserted into the second gap of the chain 2 and fixed to the fixing claw 31 through the bolt hole 314, and the two protrusions 313 of the upper fixing claw 31 are respectively inserted into the third and fourth gaps of the chain 2; Figure 4 The fixing bolt 315 of the fixing claw 31 at the lower middle part is inserted into the second to last gap of the chain 2 and fixed to the fixing claw 31 through the bolt hole 314. The two protrusions 313 of the lower fixing claw 31 are respectively inserted into the third to last and fourth gaps of the chain 2.

[0056] The fixing bolt 315 can pass through the gap of the chain 2 and be inserted into the bolt hole 314. The fixing bolt 315 and the protrusion 313 form a double insurance, which further enhances the stability of the chain 2, effectively prevents the chain 2 from being displaced, loosened or deviated during use, and ensures the reliability of the clamping component 3.

[0057] Furthermore, the HDPE pipe clamping and adjusting device of this embodiment may also include a plurality of wedge-shaped pieces 4, and the wedge-shaped pieces 4 are located between the chain 2 and the welding strip 1. Specifically, Figure 4As shown, since the vertical plate 312 has a certain thickness, when the vertical plate 312 abuts against the welding strip 1, some gaps will inevitably be generated when the chain 2 extends from the welding strip 1 to the vertical plate 312. The wedge-shaped piece 4 can be inserted into the gap between the chain 2 and the welding strip 1. The wedge-shaped design of the wedge-shaped piece 4 (one end is thicker and the other end is thinner) can effectively fill these gaps, so that the chain 2 and the welding strip 1 are in close contact. This can avoid the loosening of the clamping device due to the existence of the gap and further improve the overall stability of the device. It can be foreseen that when there is a gap between the chain and the welding strip 1 at other positions, the wedge-shaped piece 4 can be driven into the gap until all the gaps disappear.

[0058] Furthermore, at least two thermal fuses 11 are arranged on the surface of the welding strip 1 in contact with the HDPE pipe 100, and the thermal fuses 11 are wound in a multi-row overlapping manner along the length direction of the welding strip 1, such as Figure 5 The figure shows the situation of setting four hot fuses 11. The hot fuses 11 are wound along the length direction of the welding strip 1 in a serpentine multi-row superposition manner. The hot fuses 11 can specifically use conductive copper wires, and the ends of the hot fuses 11 are connected to the electric fusion welding machine. At least two hot fuses 11 are wound on the welding strip 1 in a serpentine multi-row superposition manner, so that the hot fuses 11 are evenly distributed on the welding surface during welding, providing a larger welding area and a higher welding amount, greatly improving the strength of the welding interface, ensuring that the welding area of ​​the large HDPE pipe 100 is not easy to detach or break when subjected to high pressure or high load, improving the overall welding quality, and because the hot fuses 11 are designed with multi-row superposition winding, higher welding temperature distribution and material fusion can be achieved in a shorter time, thereby significantly improving welding efficiency.

[0059] Furthermore, at least two groups of thermal fuses 11 are provided on the surface where the welding strip 1 contacts the HDPE pipe 100, and one group of thermal fuses 11 includes two thermal fuses 11. Figure 5 For example, Figure 5 Two groups of left and right thermal fuses 11 are arranged on the same welding strip 1 , and one group of thermal fuses 11 includes two thermal fuses 11 .

[0060] The distance between two adjacent groups of thermal fuses 11 is 10CM to 15CM. Figure 5 D is 10CM to 15CM; the distance between two adjacent thermal fuses 11 in the same group of thermal fuses 11 is 4CM to 6CM, for example Figure 5In the figure, d is 4CM to 6CM. The spacing within and between the groups of thermal fuses 11 is optimized, and the optimized design of the spacing between two adjacent thermal fuses 11 in the same group of thermal fuses 11 can effectively improve the welding strength of the local welding area, ensure that each group of thermal fuses 11 forms a firm welding point during the welding process, so that the local area has sufficient strength to withstand high internal pressure and external force; the reasonable spacing design between two adjacent groups of thermal fuses 11 ensures that the welding strength of the welding strip 1 is evenly distributed as a whole, thereby avoiding the phenomenon of uneven strength of the welding strip 1 along the welding interface, and effectively improving the overall stability of the welding joint.

[0061] Furthermore, in this embodiment, the position of the chain 2 corresponds to the position of the thermal fuse 11. Figure 2 and Figure 5 For example, Figure 2 The positions of the two chains 2 on the left side can be Figure 5 The positions of the two thermal fuses 11 on the left side of the middle welding strip 1 correspond to each other. Figure 2 The positions of the two chains 2 on the right side can be Figure 5 The positions of the two thermal fuses 11 on the right side of the middle welding strip 1 correspond. The design of the corresponding positions of the chain 2 and the thermal fuse 11 enables the chain 2 to apply direct pressure to the position of the thermal fuse 11 when holding the welding strip 1, ensuring that the thermal fuse 11 and the contact surface of the HDPE pipe 100 are tightly fitted. During the welding heating process, this close contact can transfer heat more efficiently, thereby promoting the thermal fuse 11 to melt quickly and penetrate into the surface of the HDPE pipe 100, achieving a more solid welding effect; at the same time, this design can fix the position of the thermal fuse 11 during welding, preventing the thermal fuse 11 from shifting due to uneven pressure from the chain 2 or slight deformation of the pipe surface. This precise positioning ensures that the thermal fuse 11 is evenly distributed at the welding interface, thereby avoiding welding defects or uneven strength problems caused by the position offset of the thermal fuse 11.

[0062] Furthermore, the length of a chain 2 is 6CM~8CM. Figure 6 As an example, a schematic diagram of the structure of two chains is shown. Figure 6 The length of L is the length of one section of chain 2, that is, L can be 6CM~8CM. The length of a single section of chain 2 is optimized. By limiting the length of each section of chain 2 to 6CM~8CM, the force-bearing area of ​​chain 2 is effectively divided into multiple small units. In this way, each small unit can apply a clamping force to the welding strip 1, forming a multi-point contact clamping mode. This design avoids the problem of pressure concentration on a single point or a single area, making the pressure applied by chain 2 to welding strip 1 more uniform, thereby ensuring the sealing and stability of welding strip 1 during welding.

[0063] When welding a large HDPE pipe 100, if a traditional clamp is used to fix the welding strip 1, the clamp will inevitably be huge in size. The large clamp clamps hold the welding strip 1 through surface contact. The stress near the tightening point of the clamp in surface contact is the largest when tightened, which can easily form an uneven stress distribution on the pipe surface, leading to stress concentration and even pipe rupture. The HDPE pipe clamping and adjustment device provided in this embodiment uses a chain 2 to hold the welding strip 1. The chain 2 and the welding strip 1 form point contact to hold the HDPE pipe 100, which greatly reduces the stress concentration. While maintaining the clamping force, it better protects the surface integrity of the HDPE pipe 100 and improves the service life of the HDPE pipe 100.

[0064] The point contact mode of the chain 2 can use the clamping component 3 to accurately adjust the tightness of the chain 2 according to actual needs, so that the force of the welding strip 1 on the outer wall of the pipe joint is more uniform. Compared with the traditional clamp fixed structure, the flexible point contact of the chain 2 enables the welding strip 1 to fit the pipe joint more closely, reducing the joint displacement problem caused by insufficient or uneven clamping, thereby effectively improving the sealing performance of the welding part, effectively avoiding the phenomenon of running, bubbling, dripping and leaking at the welding part of the HDPE pipe 100, improving the reliability of welding, and ensuring the safe operation of the pipeline under high pressure conditions;

[0065] In summary, when welding a large HDPE pipe 100, the large clamp is huge and inconvenient for on-site construction and movement. The chain 2 is smaller in size and lighter in weight, and is particularly suitable for scenes with limited construction space such as large HDPE pipes 100 (inner diameter ≥ 3000mm), which significantly reduces the difficulty of installation and transportation and improves construction efficiency.

[0066] Example 2

[0067] This embodiment provides an adjustment method for adjusting the HDPE pipe clamping adjustment device provided in Embodiment 1, such as Figure 7 The following steps are shown:

[0068] S1: Use a crane to hoist the welding tape 1 and install it at the joint of the adjacent HDPE pipes 100. Manually adjust the position of the welding tape 1 so that the welding tape 1 covers the joint area of ​​the adjacent HDPE pipes 100; first adjust the position of the welding tape 1 to ensure that the welding tape 1 covers the key welding position, which lays the foundation for the efficiency and reliability of subsequent welding.

[0069] S2: Select four chains 2 and lift them with a crane so that they are Figure 1 , Figure 2 As shown, the outer wall of the welding strip 1 is wrapped in groups of two, such as Figure 2 As shown, adjust the position of chain 2 on the welding strip 1 so that the distance between chain 2 and the edge of welding strip 1 is ≤3CM, that is, Figure 2The length of L' is ≤3CM, and the distance between two adjacent groups of chains 2 is 14CM to 20CM; the ends of each chain 2 are connected by a clamping member 3. Specifically, it can be as follows Figure 4 As shown, the protrusion 313 can be inserted into the gap of the chain 2, and then the fixing bolt 315 is passed through the gap of the chain 2 and fixedly connected to the vertical plate 312. The bolts between the two bottom plates 311 are adjusted to gradually tighten the chain 2 to complete the pre-tightening of the chain 2; by wrapping the welding strip 1 in groups of two by two, and the chain 2 is ≤3CM away from the edge of the welding strip 1, it can ensure that the edge area of ​​the welding strip 1 is subjected to sufficient clamping force, and avoid the edge area from lacking clamping force. The reduction of welding quality caused by the lack of clamping force can be avoided. Setting a reasonable spacing between the chains 2 can ensure that the surface of the welding strip 1 is uniformly stressed, and avoid the chain 2 being too dense to increase the difficulty of installation, thereby improving the stress effect and installation efficiency of the overall structure. By gradually tightening the chain 2 to complete the pre-tightening, the stress concentration problem caused by one-time tightening can be effectively prevented, and the local area of ​​the welding strip 1 can be prevented from being deformed or damaged due to excessive force. The gradual pre-tightening method can also balance the force distribution of each part of the welding strip 1 to ensure the stability of the welding area.

[0070] S3: Continue to adjust the clamping part 3 and tighten the chain 2 at intervals. Figure 2 For example, you can first tighten the first chain 2 and the third chain 2 from left to right, and then tighten the second chain 2 and the fourth chain 2 from left to right, until all chains 2 are tightly holding the welding strip 1, and the clamping adjustment of the chain 2 is completed. If it is found that there is still a gap between the chain 2 and the welding strip 1, then drive a wedge 4 into the gap between the chain 2 and the welding strip 1 until the gap between the chain 2 and the welding strip 1 is eliminated. Tightening the chain 2 at intervals can effectively prevent the chain 2 on one side of the welding strip 1 from being too tight, and maximize the fit between the welding strip 1 and the pipe joint area without damaging the welding strip 1, providing a more stable foundation for subsequent welding operations.

[0071] The adjustment method provided in this embodiment enables the chain 2 to be reasonably distributed on the welding strip 1 and uniformly applies the clamping force, so that the welding strip 1 can fit the outer wall surface of the HDPE pipe 100 more closely, ensuring that the welding strip 1 is in full contact with the surface of the HDPE pipe 100, thereby improving the sealing and strength of the welding interface, and effectively avoiding welding leaks or loose welding during the welding process.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A HDPE pipe clamping and adjusting device, characterized in that: The invention comprises a welding strip (1), wherein the welding strip (1) is used to wrap around the joints of adjacent HDPE pipes (100), the outer wall of the welding strip (1) wraps around a chain (2), the head end and the tail end of the chain (2) are connected to a clamping component (3), and the clamping component (3) is used to adjust the tightness of the chain (2).

2. The HDPE pipe clamping and adjusting device according to claim 1, characterized in that: The clamping component (3) comprises two fixing claws (31), one of the fixing claws (31) is connected to the head end of the chain (2), and the other fixing claw (31) is connected to the tail end of the chain (2); the two fixing claws (31) are arranged in a mirror image, and the fixing claws (31) comprise a bottom plate (311) and a vertical plate (312) connected to the bottom plate (311); the bottom plates (311) of the two fixing claws (31) are arranged opposite to each other and connected by bolts, the vertical plate (312) abuts against the welding strip (1), and at least two protrusions (313) are arranged on a side of the vertical plate (312) away from the welding strip (1), and the protrusions (313) can be inserted into the gap of the chain (2).

3. The HDPE pipe clamping and adjusting device according to claim 2, characterized in that: The fixing claw (31) also includes a fixing bolt (315), the vertical plate (312) is provided with at least one bolt hole (314), the position of the bolt hole (314) corresponds to the gap of the chain (2), and the fixing bolt (315) can be inserted into the bolt hole (314).

4. The HDPE pipe clamping and adjusting device according to claim 1, characterized in that: At least two thermal fuses (11) are arranged on the surface of the welding strip (1) in contact with the HDPE pipe (100), and the thermal fuses (11) are wound in a multi-row overlapping manner along the length direction of the welding strip (1).

5. The HDPE pipe clamping and adjusting device according to claim 4, characterized in that: At least two groups of thermal fuses (11) are arranged on the surface where the welding strip (1) contacts the HDPE pipe (100), one group of thermal fuses (11) comprises two thermal fuses (11), the spacing between two adjacent groups of thermal fuses (11) is 10CM to 15CM, and the spacing between two adjacent thermal fuses (11) in the same group of thermal fuses (11) is 4CM to 6CM.

6. The HDPE pipe clamping and adjusting device according to claim 5, characterized in that: The position of the chain (2) corresponds to the position of the thermal fuse (11).

7. The HDPE pipe clamping and adjusting device according to claim 1, characterized in that: The length of one section of the chain (2) is 6CM to 8CM.

8. The HDPE pipe clamping and adjusting device according to claim 1, characterized in that: It also comprises a plurality of wedge-shaped pieces (4), wherein the wedge-shaped pieces (4) are located between the chain (2) and the welding strip (1).

9. A method of regulation, characterized in that: The HDPE pipe clamping and adjusting device for adjusting any one of claims 1 to 8 comprises the following steps: S1: installing the welding strip (1), and adjusting the position of the welding strip (1) so that the welding strip (1) covers the joint area of ​​the adjacent HDPE pipes (100); S2: four chains (2) are grouped in pairs around the outer wall of the welding strip (1), and the positions of the chains (2) on the welding strip (1) are adjusted so that the distance between the chains (2) and the edge of the welding strip (1) is ≤3 cm, and the distance between two adjacent groups of chains (2) is 14 cm to 20 cm; the head and tail of each chain (2) are connected by a clamping component (3), and the chains (2) are gradually tightened to complete the pre-tightening of the chains (2); S3: Continue to adjust the clamping component (3) and tighten the chain (2) at intervals until all the chains (2) are tightly holding the welding strip (1), thus completing the clamping adjustment of the chain (2).

10. A regulating method according to claim 9, characterized in that: If it is found in S3 that there is still a gap between the chain (2) and the welding strip (1), a wedge-shaped piece (4) is driven into the gap between the chain (2) and the welding strip (1) until the gap between the chain (2) and the welding strip (1) is eliminated.

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