HDPE pipe clamping and adjusting device and adjusting method

Abstract

The present application relates to the technical field of HDPE pipe welding, in particular to a HDPE pipe clamping and adjusting device and adjusting method, wherein the HDPE pipe clamping and adjusting device comprises a welding strip, the welding strip is used for wrapping the joint of adjacent HDPE pipes, the outer wall of the welding strip is wrapped around a chain, the head end and tail end of the chain are connected with a clamping part, and the clamping part is used for adjusting the tightness of the chain. The HDPE pipe clamping and adjusting device uses a chain to tightly hold the welding strip, the chain and the welding strip form point contact to tightly hold the HDPE pipe, the stress concentration is greatly reduced, the surface integrity of the HDPE pipe is better protected while the clamping force is maintained, and the sealing performance of the welding position is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of HDPE pipe welding, in particular to an HDPE pipe clamping and adjusting device and method. BACKGROUND

[0002] HDPE pipe (High Density Polyethylene) has been widely used in water supply and drainage systems and other fields due to its excellent performance, such as reliable connection, strong impact resistance, outstanding crack resistance, aging resistance, corrosion resistance, etc.

[0003] Currently, HDPE pipes are mostly welded by hot melting, for example, the Chinese utility model patent with publication number CN219312042U discloses an internal support and external hoop device for HDPE pipe welding, which uses a clamp to fix the HDPE pipe. However, for large HDPE pipes (inner diameter ≥ 3000mm, single HDPE pipe weight ≥ 1t), due to the large welding area of large HDPE pipes, if the traditional clamp is used to fix the HDPE pipe, the volume of the clamp is huge, and the brittleness of the HDPE pipe itself can easily cause stress concentration, leading to the breakage of the HDPE pipe, affecting the welding efficiency. Moreover, the large clamp is too bulky to accurately fix the HDPE pipe, which can easily result in poor welding effect of large HDPE pipes, and leakage often occurs. The large clamp is not convenient to move and install on site, and is not suitable for welding large HDPE pipes. SUMMARY

[0004] The present application aims to overcome the shortcomings of the existing HDPE pipe clamping tool, which is not suitable for large HDPE pipes, easily causes damage to the HDPE pipe or weak welding of the HDEP pipe, and is not convenient for on-site construction, and provides an HDPE pipe clamping and adjusting device and method.

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

[0006] When welding large HDPE pipes, if a traditional clamp is used to fix the welding strip, the clamp will inevitably be huge, and the large clamp tightly holds the welding strip through surface contact. The stress is the largest near the fastening point of the clamp in surface contact, and uneven stress distribution is easily formed on the surface of the pipe, which leads to stress concentration and even pipe rupture. The HDPE pipe clamping and adjusting device provided by the application uses a chain to tightly hold the welding strip, and the chain and the welding strip form point contact to tightly hold the HDPE pipe, which greatly reduces the stress concentration, better protects the surface integrity of the HDPE pipe while maintaining the clamping force, and prolongs the service life of the HDPE pipe. The multi-point contact mode of the chain can accurately adjust the tightness of the chain by using clamping components according to actual needs, so that the stress on the outer wall of the pipe joint is more uniform. Compared with the structure of the traditional clamp, the flexible point contact of the chain enables the welding strip to be more closely attached to the pipe joint, reduces the joint displacement problem caused by insufficient or uneven clamping, effectively improves the sealing performance of the welded part, effectively avoids the phenomenon of running, bleeding, dripping and leaking at the welded part of the HDPE pipe, improves the reliability of welding, and ensures the safe operation of the pipe under high pressure conditions.

[0007] In the welding of large HDPE pipes, the large clamp is huge, which is not convenient for on-site construction and movement. The chain is smaller and lighter in size, and is especially suitable for limited space scenes such as large HDPE pipes (inner diameter ≥ 3000 mm), which significantly reduces the difficulty of installation and transportation and improves the construction efficiency.

[0008] Preferably, the clamping component includes two fixed 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 fixed claws are mirror image arranged, the fixed claw includes a bottom plate and a vertical plate connected to the bottom plate, the bottom plates of the two fixed claws are oppositely arranged and connected by bolts, the vertical plate abuts against the welding strip, at least two protruding parts are arranged on the side of the vertical plate away from the welding strip, and the protruding parts can be inserted into the gap of the chain.

[0009] The two fixed claws are connected by bolts, the distance between the bottom plates can be flexibly adjusted by adjusting the bolts, the tightness of the chain is quickly adjusted, and the adjustment convenience of the HDPE pipe clamping and adjusting device is improved; when in use, the protruding parts on the vertical plate are inserted into the gap of the chain, which effectively prevents the chain from slipping or falling off during clamping, and significantly enhances the stability of the clamping force.

[0010] Preferably, the fixed claw further includes a fixing bolt, at least one bolt hole is formed in the vertical plate, 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] In use, the fixing bolt can be inserted into the bolt hole through the gap of the chain, and the fixing bolt and the protruding part form double insurance, further enhancing the stability of the chain, effectively preventing the chain from shifting, loosening or deviating during use, and ensuring the reliability of the clamping part.

[0012] Preferably, the surface of the welding strip in contact with the HDPE pipe is provided with at least two hot melting wires, which are wound in a multi-row stacked manner along the length direction of the welding strip.

[0013] With this arrangement, at least two hot melting wires are wound in a multi-row stacked manner like a snake on the welding strip, so that the hot melting wires are uniformly distributed on the welding surface during welding, providing a larger welding area and a higher fusion amount, greatly improving the strength of the welding interface, ensuring that the welding area of the large HDPE pipe does not easily separate or break when subjected to high pressure or high load, improving the overall welding quality, and because the hot melting wires are designed to be wound in a multi-row stacked manner, higher welding temperature distribution and material fusion can be achieved in a shorter time, thereby significantly improving welding efficiency.

[0014] Preferably, the surface of the welding strip in contact with the HDPE pipe is provided with at least two groups of hot melting wires, each group of hot melting wires including two hot melting wires, the distance between adjacent two groups of hot melting wires being 10-15 cm, and the distance between adjacent two hot melting wires in the same group of hot melting wires being 4-6 cm.

[0015] The group and inter-group distances of the hot melting wires are optimized, and the optimization design of the distance between adjacent two hot melting wires in the same group of hot melting wires can effectively improve the fusion strength of the local welding area, ensuring that each group of hot melting wires forms a firm welding point during welding, so that the local area has sufficient strength to withstand high internal pressure and external force; the reasonable distance between adjacent two groups of hot melting wires ensures that the welding strength of the welding strip is uniformly distributed as a whole, thereby avoiding uneven strength of the welding strip along the welding interface, and effectively improving the overall stability of the welded joint.

[0016] Preferably, the position of the chain corresponds to the position of the hot melting wire.

[0017] The design of the chain corresponding to the position of the hot melt wire enables the chain to apply direct pressure on the hot melt wire when it is clamped around the welding strip, ensuring that the hot melt wire is in close contact with the contact surface of the HDPE pipe. During the welding heating process, this close contact can more efficiently transfer heat, thereby promoting the rapid melting and penetration of the hot melt wire into the surface of the HDPE pipe, achieving a more secure welding effect; at the same time, this design can fix the position of the hot melt wire during welding, preventing the phenomenon of hot melt wire displacement due to uneven pressure exerted by the chain or slight deformation of the pipe surface. This precise positioning ensures uniform distribution of the hot melt wire on the welding interface, thereby avoiding welding defects or uneven strength problems caused by hot melt wire position deviation.

[0018] Preferably, the length of each link of the chain is 6-8 cm.

[0019] By limiting the length of each link of the chain to 6-8 cm, the stress area of the chain is effectively divided into multiple small units. In this way, each small unit can exert clamping force on the welding strip, forming a multi-point contact clamping mode. This design avoids the problem of pressure concentration in 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 welding.

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

[0021] When the first and last links of the chain are connected to the clamping components, gaps may be generated between the first and / or last ends of the chain and the welding strip. The wedge-shaped pieces can be inserted into the gaps between the chain and the welding strip during use. The wedge-shaped design of the wedge-shaped pieces can effectively fill these gaps, ensuring that the chain and the welding strip are in close contact. This can prevent the clamping device from loosening due to the presence of gaps, further improving the overall stability of the device.

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

[0023] S1: Install the welding strip and adjust the position of the welding strip to cover the joint area of the adjacent HDPE pipes;

[0024] S2: Two pairs of chains are wrapped around the outer wall of the welding strip, and the position of the chains on the welding strip is adjusted so that the distance between the chains and the edges of the welding strip is ≤3 cm, and the distance between the two adjacent groups of chains is 14-20 cm; the first and last links of each chain are connected through clamping components, and the chains are gradually tightened to complete the pre-tightening of the chains;

[0025] S3: Continue to adjust the clamping components and tighten the chains at intervals until all the chains are clamped around the welding strip, completing the clamping and adjusting of the chains.

[0026] The adjusting method provided by the present application first adjusts the position of the welding strip, ensures that the welding strip covers the key welding position, and lays a foundation for the efficiency and reliability of subsequent welding; by grouping the four chains in pairs to wrap the welding strip, the distance between the chains and the edge of the welding strip is ≤3CM, which can ensure that the edge area of the welding strip is subjected to sufficient pressing force, avoid the welding quality from being reduced due to the lack of pressing force in the edge area, and reasonably set the chain spacing to ensure that the welding strip surface is uniformly stressed and avoid the chain from being too dense to increase the installation difficulty, thereby improving the stress effect and installation efficiency of the overall structure; the stress concentration problem caused by one-time tightening can be effectively prevented by gradually tightening the chains, the local area of the welding strip is prevented from being deformed or damaged due to excessive stress, and the gradually pre-tightening mode can also balance the stress distribution of each part of the welding strip to ensure the stability of the welding area; the interval tightening chain can well avoid the welding strip on one side from being too tight, and the adhesion degree of the welding strip and the pipe joint area is maximized on the premise of not damaging the welding strip, thereby providing a more stable basis for subsequent welding operation.

[0027] The adjusting method provided by the present application enables the chains to be reasonably distributed on the welding strip and uniformly apply clamping force, the welding strip can be more closely attached to the outer wall surface of the HDPE pipe, and the welding strip and the surface of the HDPE pipe are ensured to be in full contact, thereby improving the sealing performance and strength of the welding joint and effectively avoiding the problems of incomplete welding or poor welding during the welding process.

[0028] Preferably, if a gap is found between the chain and the welding strip in S3, a wedge-shaped piece 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] Driving a wedge-shaped piece into the gap between the chain and the welding strip can effectively eliminate the gap caused by the incomplete attachment between the chain and the welding strip. The wedge-shaped structure of the wedge-shaped piece can gradually fill the gap, so that the chain and the welding strip form a more close contact, thereby ensuring that the welding strip surface is uniformly stressed and avoiding the welding quality from being reduced due to insufficient local pressure.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] 1. The HDPE pipe clamping adjusting device provided by the present application uses chains to tightly hold the welding strip, the chains and the welding strip form point contact to tightly hold the HDPE pipe, which greatly reduces the stress concentration, 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 chains can accurately adjust the tightness of the chains by using clamping components according to actual needs, so that the welding strip is more uniformly stressed on the outer wall of the pipe joint;

[0032] 2. The HDPE pipe clamping and adjusting device provided by the present application, compared with the structure of the traditional clamp fixing, the flexible point contact of the chain enables the welding strip to be more closely attached to the pipe joint, reduces the joint displacement problem caused by insufficient or uneven clamping, thereby effectively improving the sealing performance of the welding position, effectively avoiding the phenomenon of running, bleeding, dripping and leaking at the welding position of the HDPE pipe, improving the reliability of welding, and ensuring the safe operation of the pipe under high pressure conditions.

[0033] 3. The adjusting method provided by the present application enables the chain to be reasonably distributed on the welding strip and uniformly apply clamping force, so that the welding strip can be more closely attached to the outer wall surface of the HDPE pipe, ensuring that the welding strip and the surface of the HDPE pipe are in full contact, thereby improving the sealing performance and strength of the welding interface and effectively avoiding the occurrence of incomplete welding or unstable welding during the welding process. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The HDPE pipe clamping and adjusting device provided for Example 1 is in use state diagram;

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

[0036] Figure 3 The structure diagram of the clamping part;

[0037] Figure 4 The local diagram when the chain head and tail are connected with the clamping part;

[0038] Figure 5 The welding strip diagram;

[0039] Figure 6 The structure diagram of two chain links;

[0040] Figure 7 The flowchart of the adjusting method provided for Example 2.

[0041] Markings in the figure:

[0042] 1-welding strip, 11-hot melt wire, 2-chain, 3-clamping part, 31-fixing claw, 311-bottom plate, 312-stand plate, 313-protruding part, 314-bolt hole, 315-fixing bolt, 4-wedge-shaped piece, 100-HDPE pipe. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below in conjunction with specific embodiments. However, it should not be understood that the above-mentioned subject matter of the present application is limited to the following examples only, and any technology realized based on the content of the present application falls within the scope of the present application.

[0044] In the description of the embodiments of the present application, the terms of orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", and the like, are expressed based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product / device / apparatus of the present application is usually used. These terms of orientation or positional relationship are only for the convenience of describing the present application or simplifying the description in the embodiments, and for the convenience of the skilled person 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 positional relationship, and therefore cannot be understood as a limitation on the present application.

[0045] In addition, the terms "horizontal", "vertical", "suspended", "parallel", and the like, do not mean that the corresponding device / component / element must be absolutely horizontal or vertical or suspended or parallel, but can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to understand that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "suspended", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. 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 application.

[0046] In addition, the terms "first", "second", "third", and the like, are only used to distinguish the same or similar components for description, and should not be understood as emphasizing or implying the relative importance of a specific component.

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

[0048] In addition, in the description of the technical scheme of the present application, unless otherwise specified / limited / limited, the terms "arrangement", "installation", "connection", "connection", "provided with", "laid", "arrangement" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, such as welding, riveting, bolting, screwing, etc. The connection means commonly used in the art. Such connection can be mechanical connection, or electrical connection or communication connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements.

[0049] Embodiment 1

[0050] The embodiment provides a HDPE pipe clamping and adjusting device for fixing a pipe joint during electric fusion welding of a large HDPE pipe (an inner diameter is greater than or equal to 3000 mm, and a self weight of a single HDPE pipe is greater than or equal to 1 t).

[0051] As shown in Figure 1 , Figure 2 , the HDPE pipe clamping and adjusting device provided by the embodiment comprises a welding strip 1, and the welding strip 1 is used for wrapping a joint of adjacent HDPE pipes 100. Specifically, as shown in Figure 2 , the welding strip 1 can be a rectangular long strip-shaped welding strip, the welding strip 1 can cover the joint of the adjacent two HDPE pipes 100, and the length of the welding strip 1 can be just equal to the circumference of the joint of the HDPE pipes 100. It can be predicted that the length of the welding strip 1 can also be shorter (the short part can be filled by repair welding later) or slightly longer (the part that is too long can be cut later) than the circumference of the joint of the HDPE pipes 100. The outer wall of the welding strip 1 is wrapped around a chain 2, the leading end and the tail end of the chain 2 are connected with a clamping component 3, so that Figure 1 , for example, if the leading end of the chain 2 is connected with the upper part of the clamping component 3, the tail end of the chain 2 is connected with the lower part of the clamping component 3; similarly, if the tail end of the chain 2 is connected with the upper part of the clamping component 3, the leading end of the chain 2 is connected with the lower part of the clamping component 3. The clamping component 3 is used for adjusting the tightness of the chain 2, that is, the clamping component 3 can adjust the chain 2 to tightly hold or loosen the welding strip 1.

[0052] Specifically, as shown in Figure 3 , Figure 4 , the clamping component 3 comprises two fixed claws 31, one fixed claw 31 is connected with the leading end of the chain 2, and the other fixed claw 31 is connected with the tail end of the chain 2.

[0053] As shown in Figure 3 , the two fixed claws 31 are arranged in an upper-lower mirror image mode, and the fixed claw 31 comprises a bottom plate 311 and a vertical plate 312 connected with the bottom plate 311. Specifically, the bottom plate 311 and the vertical plate 312 can be vertically arranged in an L shape. The bottom plates 311 of the two fixed claws 31 are oppositely arranged and connected by bolts, and as shown in Figure 3 , Figure 4 , the distance between the two bottom plates 311 can be quickly adjusted by adjusting the bolts connecting the two bottom plates 311, so as to adjust the tightness of the chain 2. The vertical plate 312 abuts against the welding strip 1, and further, as shown in Figure 4 , the side of the vertical plate 312 facing the welding strip 1 can be arc-shaped, and the curvature of the arc-shaped vertical plate 312 can match the curvature of the HDPE pipe, so as to further improve the fit degree of the clamping component 3 and the welding strip 1. As shown in Figure 3 , the chain 2 is wrapped around the welding strip 1, and the leading end and the tail end of the chain 2 are connected with the clamping component 3.As shown, the back side of the vertical plate 312 away from the welding strip 1 is provided with at least two protruding parts 313, which can be inserted into the gap of the chain 2. Figure 4 As shown, the protruding parts 313 can be inserted into the gap of the chain 2, and in use, the protruding parts 313 are gradually pulled to tighten the head and tail ends of the chain 2 by adjusting the bolts between the two bottom plates 311, so as to realize the tension adjustment of the chain 2.

[0054] The two fixed claws 31 are connected by bolts, and the distance between the bottom plates 311 can be flexibly adjusted by adjusting the bolts, so as to quickly adjust the tension of the chain 2 and improve the adjustment convenience of the HDPE pipeline 100 clamping adjustment device; in use, the protruding parts 313 on the vertical plate 312 are inserted into the gap of the chain 2, which effectively prevents the chain 2 from slipping or falling off during clamping, and significantly enhances the stability of the clamping force.

[0055] Further, as shown in Figure 3 , Figure 4 The fixed claw 31 further comprises a fixed bolt 315, and the vertical plate 312 is provided with at least one bolt hole 314. Figure 3 For example, the bolt hole 314 can be arranged between the protruding part 313 and the bottom plate 311. The position of the bolt hole 314 corresponds to the gap of the chain 2, and the fixed bolt 315 can be inserted into the bolt hole 314. Figure 4 For example, Figure 4 The fixed claw 31 in the upper part is connected with the head end of the chain 2, Figure 4 The fixed claw 31 in the lower part is connected with the tail end of the chain 2, then Figure 4 The fixed bolt 315 of the fixed claw 31 in the upper part is inserted into the second gap of the chain 2 and fixed with the fixed claw 31 through the bolt hole 314, and the two protruding parts 313 of the upper fixed claw 31 are respectively inserted into the third and fourth gaps of the chain 2; Figure 4 The fixed bolt 315 of the fixed claw 31 in the lower part is inserted into the second last gap of the chain 2 and fixed with the fixed claw 31 through the bolt hole 314, and the two protruding parts 313 of the lower fixed claw 31 are respectively inserted into the third and fourth gaps of the chain 2.

[0056] The fixed bolt 315 can be inserted into the bolt hole 314 through the gap of the chain 2, and the fixed bolt 315 and the protruding part 313 form a double insurance, which further enhances the stability of the chain 2, effectively prevents the chain 2 from moving, loosening or deviating during use, and ensures the reliability of the clamping part 3.

[0057] Further, the HDPE pipeline clamping adjustment device of the embodiment can further comprise a plurality of wedge-shaped pieces 4, which are located between the chain 2 and the welding strip 1. Specifically, as shown in 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 (thicker at one end and thinner at the other end) of the wedge-shaped piece 4 can effectively fill the gaps, so that the chain 2 and the welding strip 1 are kept in close contact. In this way, the loosening of the clamping device caused by the existence of the gap can be avoided, and the overall stability of the device is further improved. It can be predicted that when gaps exist between the chain and the welding strip 1 at other positions, the wedge-shaped piece 4 can be inserted into the gap until all the gaps disappear.

[0058] Further, at least two hot wires 11 are arranged on the surface of the welding strip 1 in contact with the HDPE pipeline 100. The hot wires 11 are wound in a multi-row stacked manner along the length direction of the welding strip 1, as shown in Figure 5 Four hot wires 11 are arranged, and the hot wires 11 are wound in a multi-row stacked manner along the length direction of the welding strip 1 in a serpentine shape. The hot wires 11 can be made of conductive copper wire, and the ends of the hot wires 11 are connected to the electric fusion welding machine. The at least two hot wires 11 are wound in a multi-row stacked manner in a serpentine shape on the welding strip 1, so that the hot wires 11 are uniformly distributed on the welding surface during welding, providing a larger welding area and a higher fusion amount, greatly improving the strength of the welding interface, ensuring that the welding area of the large HDPE pipeline 100 does not easily separate or break under high pressure or high load, improving the overall welding quality, and since the hot wires 11 are designed to be wound in a multi-row stacked manner, a higher welding temperature distribution and material fusion can be achieved in a shorter time, thereby significantly improving the welding efficiency.

[0059] Further, at least two groups of hot wires 11 are arranged on the surface of the welding strip 1 in contact with the HDPE pipeline 100, and each group of hot wires 11 includes two hot wires 11. For example, Figure 5 As shown in Figure 5 Two groups of hot wires 11 are arranged on the same welding strip 1, and each group of hot wires 11 includes two hot wires 11.

[0060] The distance between the two adjacent groups of hot wires 11 is 10CM-15CM, for example Figure 5 In the example, D is 10CM-15CM; the distance between the two adjacent hot wires 11 in the same group of hot wires 11 is 4CM-6CM, for example Figure 5d is 4cm to 6cm. Optimizing the spacing within and between groups of thermal fuses 11 and optimizing the spacing between two adjacent thermal fuses 11 within the same group can effectively improve the weld strength of the local welding area, ensuring that each group of thermal fuses 11 forms a solid weld point during the welding process, giving the local area sufficient strength to withstand high internal pressure and external forces. The reasonable spacing design between two adjacent groups of thermal fuses 11 ensures that the welding strength of the welding ribbon 1 is evenly distributed overall, thereby avoiding uneven strength of the welding ribbon 1 along the welding interface and effectively improving the overall stability of the welded 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 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 on the position of the thermal fuse 11 when holding the welding strip 1, ensuring that the thermal fuse 11 fits tightly with the contact surface of the HDPE pipe 100. During the welding heating process, this close contact can transfer heat more efficiently, thereby promoting the thermal fuse 11 to quickly melt 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 the welding process, 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 in the diagram represents the length of one section of chain 2, which can be 6-8 cm. By optimizing the length of each section of chain 2 to 6-8 cm, the force-bearing area of ​​chain 2 is effectively divided into multiple smaller units. This allows each unit to exert a clamping force on the welding ribbon 1, creating a multi-point clamping pattern. This design avoids the problem of concentrated pressure at a single point or area, ensuring more uniform pressure from chain 2 on the welding ribbon 1 and ensuring a tight seal and stability during welding.

[0063] When welding a large HDPE pipe 100, using a traditional clamp to secure the welding strip 1 inevitably results in a large clamp. The large clamp clamps grip the welding strip 1 through surface contact, and the stress near the clamping point is greatest during tightening. This can easily create 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, however, uses a chain 2 to grip the welding strip 1. The chain 2 and the welding strip 1 form point contact to grip the HDPE pipe 100, significantly reducing stress concentration. While maintaining the clamping force, it better protects the surface integrity of the HDPE pipe 100, thereby increasing the service life of the HDPE pipe 100.

[0064] The point contact of chain 2 allows for precise adjustment of chain 2 tension using clamping components 3 as needed, ensuring a more even force distribution between the welding strip 1 and the outer wall of the pipe joint. Compared to traditional clamp-fixed structures, the flexible point contact of chain 2 allows the welding strip 1 to fit more closely to the pipe joint, reducing joint displacement caused by insufficient or uneven clamping. This effectively enhances the sealing performance of the weld, effectively preventing bubbling, dripping, and leaks in the welded areas of the HDPE pipe 100, improving welding reliability, and ensuring safe operation of the pipeline under high-pressure conditions.

[0065] In summary, when welding large HDPE pipes 100, large clamps are bulky and inconvenient to install and move on-site. Chain 2 is smaller and lighter, making it particularly suitable for applications with limited space, such as large HDPE pipes 100 (inner diameter ≥ 3000mm). It significantly reduces installation and transportation difficulties and improves construction efficiency.

[0066] Example 2

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

[0068] S1: Use a crane to hoist welding tape 1 and install it at the joint of adjacent HDPE pipes 100. Manually adjust the position of welding tape 1 so that it covers the joint area of ​​adjacent HDPE pipes 100. Adjusting the position of welding tape 1 first ensures that it covers the key welding area, laying the foundation for efficient and reliable subsequent welding.

[0069] S2: Select four chains 2 and lift them with a crane so that they are as follows: Figure 1 、 Figure 2 As shown, the outer wall of the welding strip 1 is wrapped in groups of two, as shown 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, Figure 4 As shown, the protrusion 313 can be inserted into the gap of the chain 2, and then the fixing bolt 315 can be 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 four chains 2 around the welding strip 1 in groups of 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 compression force, avoiding the edge area from lacking compression force and causing a decrease in welding quality. Setting a reasonable spacing between the chains 2 can not only ensure that the surface of the welding strip 1 is uniformly stressed, but also avoid the chains 2 being too dense and increasing the difficulty of installation, thereby improving the stress effect and installation efficiency of the overall structure. By gradually tightening the chain 2 to complete pre-tightening, it can effectively prevent the stress concentration problem caused by one-time tightening, and avoid deformation or damage of local areas of the welding strip 1 due to excessive force. The gradual pre-tightening method can also balance the force distribution of various parts of the welding strip 1, ensuring 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 and third chains 2 from left to right, and then tighten the second and fourth chains 2 from left to right, until all chains 2 are tightly holding the welding strip 1, completing the clamping adjustment of the chains 2. If a gap is found between the chain 2 and the welding strip 1, 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 chains 2 at intervals can effectively prevent excessive tension on one side of the welding strip 1. Without damaging the welding strip 1, it maximizes the fit between the welding strip 1 and the pipe joint area, 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. 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 scope of protection 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); The clamping component (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); the two fixing claws (31) are arranged in a mirror image, and the fixing claws (31) include 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 plates (312) are in contact with the welding strip (1), and at least two protrusions (313) are provided on a side of the vertical plate (312) facing away from the welding strip (1), and the protrusions (313) can be inserted into the gap of the chain (2).

2. The HDPE pipe clamping and adjusting device according to claim 1, characterized in that: The fixing claw (31) further includes a fixing bolt (315), and 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).

3. The HDPE pipe clamping and adjusting device according to claim 1, characterized in that: At least two thermal fuses (11) are provided 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).

4. The HDPE pipe clamping and adjusting device according to claim 3, characterized in that: At least two groups of thermal fuses (11) are provided 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.

5. The HDPE pipe clamping and adjusting device according to claim 4, characterized in that: The position of the chain (2) corresponds to the position of the thermal fuse (11).

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

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

8. A method of regulation, characterized in that: The HDPE pipe clamping and adjusting device for adjusting any one of claims 1 to 7 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 pipe (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 ≤ 3CM, and the distance between two adjacent groups of chains (2) is 14CM~20CM; the ends 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).

9. The adjustment method according to claim 8, 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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