PE pipe hot melting support tooling

Abstract

This invention discloses a PE pipe hot-melt support fixture, which includes a support base, a receiving frame, a lifting mechanism, and a swing mechanism located between the lifting mechanism and the receiving frame. The receiving frame is equipped with guide wheels along the pipe axis. The swing mechanism adopts a parallelogram forced synchronization mechanism composed of a swing disk, a pneumatic swing arm, a first connecting rod, and a synchronizing arm and a second connecting rod. Combined with the sliding connection between the bottom slider of the receiving frame and the eccentric arc-shaped groove on the swing disk, and the double conical guide wheels, a dynamic self-balancing support system is formed. This invention can automatically adapt to the bending and off-center load of the pipe, achieving stable support, self-centering, and attitude compensation during pipe movement and docking, thus improving work efficiency, docking accuracy, and operational safety.

Description

Technical Field

[0001] This invention relates to the field of auxiliary devices for pipe processing, and specifically to a PE pipe hot-melt support fixture. Background Technology

[0002] In fields such as shipbuilding and petrochemicals, polyethylene (PE) pipes often have diameters exceeding DN300 and wall thicknesses reaching 50mm. During the hot-melt butt welding construction of polyethylene pipes, there is a lack of efficient and safe solutions for the precise axial positioning and movement of the pipes on the hot-melt machine.

[0003] Specifically, the standard hot melt process requires precise, short-stroke axial movement of the pipe on the frame to complete cleaning after end milling, placement of the heating plate, and final connection. However, many existing hot melt machines, especially some newer models or those used for large-diameter pipes, lack axial movement auxiliary mechanisms in their design. This directly leads to the reliance on external lifting equipment to suspend the pipe and move it on the frame during construction. Frequent coordination and waiting for lifting severely disrupt the continuous process flow, resulting in low work efficiency; furthermore, the inherent starting and stopping inertia of the lifting equipment makes it difficult to fine-tune the pipe, easily leading to quality defects such as poor connection and uneven heating. Summary of the Invention

[0004] The purpose of this invention is to fill the gap in the prior art and provide a support fixture for PE pipes.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows.

[0006] A PE pipe hot-melt support fixture includes a support base and a receiving frame, and a lifting mechanism located between the two. The receiving frame is provided with a guide wheel, and the rotation direction of the guide wheel is arranged along the axial direction of the PE pipe. A swing mechanism is provided between the lifting mechanism and the receiving frame.

[0007] As a preferred technical solution, the swing direction of the swing mechanism is set along the circumference of the PE pipe, so that the receiving frame can swing around a virtual axis parallel to the axis of the PE pipe; the swing path of the swing mechanism causes the receiving frame to swing around the circumference of the PE pipe, and the swing center of the swing mechanism is set off-center from the axis of the PE pipe.

[0008] As a preferred technical solution, the swing mechanism includes a horizontally arranged swing disk and two symmetrically arranged pneumatic swing arms; the swing disk is floating above the lifting mechanism, the upper end of the pneumatic swing arm is hinged to the bottom of the swing disk through a first hinge shaft, and its lower end is hinged to the side of the lifting mechanism through a second hinge shaft, thereby forming a suspension system with the swing disk and the supporting structure above it.

[0009] As a preferred technical solution, the left and right sides of the receiving frame are respectively connected to the corresponding pneumatic swing arms through the inclined first connecting rods; the upper end of the first connecting rod is hinged to the side of the receiving frame, and the lower end is hinged to the middle or near the upper part of the corresponding pneumatic swing arm. When the receiving frame tilts due to the action of the PE pipe, the tilting posture is transmitted to the pneumatic swing arm through the first connecting rod, forcing the two pneumatic swing arms to produce asymmetrical extension and contraction.

[0010] As a preferred technical solution, the swing disk is provided with a sliding groove, and a slider that cooperates with the sliding groove is fixed at the corresponding position at the bottom of the receiving frame. The sliding groove has an arc-shaped structure, and the center of the arc-shaped structure is eccentrically downward relative to the axis of the PE pipe. The slider cooperates with the sliding groove to form a stroke limit.

[0011] As a preferred technical solution, the guide wheel is constructed as a cylindrical structure that matches the outer wall contour of the PE pipe. The cylindrical structure gradually narrows from both ends to the middle section, forming a double-cone or waist-drum shaped rotating working surface.

[0012] As a preferred technical solution, a plane bearing or sliding pad is provided between the swing disk and the receiving frame, and the receiving frame is slidably connected on the swing disk.

[0013] As a preferred technical solution, the pneumatic swing arm includes a gas spring or damping cylinder with adjustable damping and / or self-resetting function.

[0014] As a preferred technical solution, the lifting mechanism is a scissor lift platform or a screw jack.

[0015] As a preferred technical solution, two synchronous arms are provided between the swing disk and the two pneumatic swing arms, which are respectively fixed to the shafts of the two pneumatic swing arms, and a second connecting rod spanning both sides; the two ends of the second connecting rod are respectively hinged to the upper ends of the synchronous arms on both sides; when one pneumatic swing arm extends or retracts due to the tilt of the support frame, the synchronous arm drives the second connecting rod to drive the other pneumatic swing arm to extend or retract symmetrically in the opposite direction.

[0016] This invention also provides a method for hot-melt butt welding of PE pipes, comprising the following steps: S1. Move the two PE pipe hot melt support fixtures to both sides of the hot melt machine; S2. Push the two PE pipes to be welded so that they slide axially on the guide wheels of their respective fixtures until the weldable ends of the two PE pipes extend into the clamping range of the hot melt machine. S3. The hot melt machine clamps the pipe body near the end of the two pipe sections respectively, and starts the milling cutter of the hot melt machine to mill the end face of the two pipe sections to be welded to obtain the welding surface. S4. After milling is completed, the hot melt machine fixture remains in the clamping state and the welding surface is processed into a slope, and the slope angle of the slope continuously decreases from the center line to both sides. S5. Place the heating plate between the end faces of the two pipe sections and apply pressure for heating. After heating is complete, remove the heating plate and release the clamp; align the two welding surfaces; during movement, the gradient bevel formed at the end of one PE pipe contacts the end face of the other PE pipe; S6. Maintain docking pressure and enter the pressure holding and cooling stage. After cooling is complete, release the hot melt machine clamps.

[0017] The advantages and beneficial effects of this invention are as follows: the tilt angle of the swing plate and the posture of the pipeline are adjusted by means of the pneumatic swing arm and the first linkage mechanism; by means of the cooperation between the bottom slider of the support frame and the eccentric arc groove on the swing plate, the support point can be automatically adjusted along a specific trajectory according to the degree of pipe curvature, thus realizing adaptive compensation for the degree of pipe alignment.

[0018] When the pipeline is placed on the support frame, the fixture absorbs the impact through the extension and retraction damping of the pneumatic swing arm and adjusts the support posture through the aforementioned linkage mechanism, ensuring that the pipeline is always in a natural and stable suspended support state. In actual operation, the operator only needs to adjust the support height through the lifting mechanism to manually and easily push the pipeline to move precisely along the axial direction, completing the cleaning displacement after milling and the final docking, without the need for a crane, which helps to improve the quality of hot melt welding. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the supporting fixture shown in this invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the swing mechanism of the present invention.

[0021] Figure 3 This is a schematic diagram of the guide wheel of the present invention.

[0022] Figure label: 1-Support base, 2-Receiving frame, 3-Lifting mechanism, 4-Guide wheel, 5-Swing mechanism, 6-Swing disc, 7-Pneumatic swing arm, 8-First connecting rod, 9-Slide groove, 10-Plane bearing or sliding pad, 11-Synchronous arm, 12-Second connecting rod. Detailed Implementation

[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0024] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly or implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] This invention provides a PE pipe hot-melt support fixture, which is particularly suitable for hot-melt butt welding of large-diameter, thick-walled polyethylene pipes in fields such as shipbuilding and petrochemicals.

[0027] like Figure 1 As shown, the support fixture mainly includes a support base 1, a receiving frame 2, a lifting mechanism 3, and a swing mechanism 5 disposed between the lifting mechanism 3 and the receiving frame 2. The receiving frame 2 is equipped with guide wheels 4, the rotation direction of which is along the axial direction of the PE pipe. The support base 1 typically adopts a robust rectangular steel welded frame.

[0028] The lifting mechanism 3 is located between the support base 1 and the swing mechanism 5. It is used to adjust the height of the receiving frame 2 to accommodate PE pipes of different diameters. The lifting mechanism 3 can be a manual scissor lift platform, a trapezoidal screw jack, or an electric push rod lifting column, etc. The operator can smoothly adjust the vertical position of the receiving frame 2 using a hand crank or control button.

[0029] The rotation axis of the guide wheel 4 is perpendicular to the radial direction of the pipe, so that the pipe can be pushed and pulled along its own axis on the receiving frame 2, so as to control the docking displacement required for the pipe to complete the hot melt process.

[0030] The swing mechanism 5 is positioned between the top of the lifting mechanism 3 and the bottom of the support frame 2. When large-diameter PE pipes are hoisted to the fixture or due to their own deflection, their actual axis is often not an ideal horizontal straight line and may have slight bending or tilting. If the support fixture is a rigid structure, it will force the pipe to deform, generating additional stress and affecting the subsequent docking accuracy. The swing mechanism 5 provides an adaptively adjustable multi-degree-of-freedom flexible support for the support frame 2 and the pipe it supports. When there is an attitude deviation in the pipe, the swing mechanism 5 allows the support frame 2 to tilt and deflect in a coordinated manner within a certain range, thereby adapting to the actual shape of the pipe and ensuring that the pipe is in a relatively natural and stress-free position under support.

[0031] In some preferred embodiments, the swing mechanism 5 employs a composite design integrating pneumatic damping and mechanical linkage. For example... Figure 2 As shown, the swing mechanism 5 includes a horizontally arranged swing disk 6 and two symmetrically arranged pneumatic swing arms 7. The swing disk 6 is suspended above the lifting mechanism 3 by the pneumatic swing arms 7.

[0032] Specifically, the upper end of each pneumatic swing arm 7 is hinged to the bottom of the swing disk 6 via a first hinge shaft, and its lower end is rigidly connected to the top or side of the lifting mechanism 3 via a second hinge shaft. The pneumatic swing arm 7 is preferably a gas spring or industrial damping cylinder with adjustable damping and self-resetting functions. It is filled with an inert gas (such as nitrogen) at a set pressure, providing stable support to bear the weight of the pipeline in a static state, and providing smooth damping and buffering through the extension and retraction of the piston rod in a dynamic state, absorbing the impact during pipeline placement or adjustment.

[0033] To achieve precise synchronization between the posture of the receiving frame 2 and the tilt of the swing disk 6, the left and right sides of the receiving frame 2 are each connected to the corresponding pneumatic swing arm 7 via an inclined first connecting rod 8. The upper end of the first connecting rod 8 is hinged to the side of the receiving frame 2 via a third hinge shaft, and the lower end is hinged to the middle or near the upper part of the corresponding pneumatic swing arm 7 via a fourth hinge shaft. In this way, the first connecting rod 8, the body of the pneumatic swing arm 7, and the virtual connection between the receiving frame 2 and the swing disk 6 together constitute a spatial four-bar linkage system.

[0034] When the resultant force acting on the support frame 2 deviates from the center due to uneven weight distribution or initial bending of the pipeline, the support frame 2 will generate a tilting moment. Assuming the pipeline causes the right side of the support frame 2 to tend to sink, the upper hinge point of the right first link 8 will subsequently displace downwards and slightly inwards. Since the first link 8 is a rigid component, this displacement will translate into an inward thrust on the hinge point of the right pneumatic swing arm 7. This thrust constitutes a moment, forcing the piston rod of the right pneumatic swing arm 7 to compress against the internal air cushion pressure. Simultaneously, the left side of the support frame 2 rises relatively, and the left first link 8 generates an outward pulling force on the rod of the left pneumatic swing arm 7, forcing the piston rod of the left pneumatic swing arm 7 to stretch.

[0035] The asymmetrical movement of the pair of pneumatic swing arms 7, one extending and the other retracting, is converted into the tilting motion of the swing disk 6 around its geometric center via the first hinge shaft—that is, the right side descends and the left side rises. The core of this process lies in the fact that the tilting posture of the support frame 2, through the rigid connection of the first link 8, is reflected as the extension and retraction of the pneumatic swing arms 7, which in turn drives the swing disk 6 to tilt in tandem. The tilting of the swing disk 6 means that the support plane of the entire suspension system changes, thereby automatically adjusting the support angle for the pipeline and compensating for the initial attitude deviation of the pipeline.

[0036] To further enhance the symmetry and synchronization of the movements of the two pneumatic swing arms 7 and prevent possible motion lag, in a further embodiment, the swing mechanism 5 also integrates a parallelogram-shaped forced synchronization mechanism. For example... Figure 2 As shown, the synchronization mechanism includes two synchronization arms 11 fixedly connected to the bodies of two pneumatic swing arms 7, and a second connecting rod 12 spanning both sides. The two ends of the second connecting rod 12 are connected to the upper ends of the synchronization arms 11 on both sides via hinge shafts. When one pneumatic swing arm 7 begins to compress due to the aforementioned mechanism, its synchronization arm 11 rotates accordingly. Through the rigid connection of the second connecting rod 12, this rotation is forcibly transmitted to the synchronization arm 11 on the other side, thereby driving the other pneumatic swing arm 7 to perform an equal but opposite movement. This makes the tilting motion of the swing disk 6 more precise and stable, eliminating the potential for support instability caused by unilateral response lag.

[0037] In one embodiment, the connection between the receiving frame 2 and the swing disk 6 is configured as an eccentric connection structure.

[0038] like Figure 3 As shown, a specific arc-shaped groove 9 is machined on the upper surface of the oscillating disk 6. This groove 9 is not centered on the center of the oscillating disk 6, but rather designed so that its center is eccentrically downwards relative to the ideal axis of the supported PE pipe. In other words, the center of curvature of the arc-shaped groove 9 is located directly below the pipe axis. Correspondingly, a slider that precisely matches the groove 9 is fixedly installed at the bottom of the receiving bracket 2.

[0039] When the supported PE pipe exhibits downward deflection, the middle of the pipe will sag. Traditional supports would forcibly hold the pipe in place, but in this invention, as the pipe sags, the force acting on the guide wheels 4 on both sides pushes the support frame 2 along the trajectory of the arc-shaped groove 9 towards the inside (i.e., downward) of the pipe bend. Because the center of the groove 9 is eccentrically downward, this sliding process simultaneously fine-tunes the position of each support point on the support frame 2 relative to the pipe's bending shape, allowing the distribution of the supporting force to better balance the internal bending moment generated by the pipe's bending, thus achieving adaptive adjustment of the support point position to the pipe's deflection.

[0040] To make the sliding smoother, low-friction elements, such as flat bearings or sliding pads 10, can be installed between the swing disk 6 and the support frame 2. Even under heavy loads, the support frame 2 can smoothly slide a small amount on the swing disk 6.

[0041] Thus, the support fixture of the present invention realizes a two-level adaptive mechanism: the macroscopic tilt angle of the support frame 2 and the pipeline is self-adjusted by the pneumatic swing arm 7 and the first connecting rod 8 to cope with the axial tilt; the microscopic position of the support point of the support frame 2 is self-adjusted by the eccentric arc-shaped slide groove 9 to cope with the bending of the pipeline.

[0042] As the component that directly supports the pipeline, the support frame 2 needs to balance strength and function in its structure. In some embodiments, the main body of the support frame 2 consists of a pair of parallel high-strength arc-shaped load-bearing arms, which are welded together by multiple reinforcing beams to form a robust frame structure. The inner arc surface of the arc-shaped load-bearing arms can be lined with wear-resistant engineering plastic plates, and the curvature is suitable for commonly used pipe diameters.

[0043] Guide wheels 4 are mounted in groups on the inner side of each arc-shaped load-bearing arm via wheel frames, with each group including at least two guide wheels 4 arranged along the pipe axis. For example... Figure 3 As shown, the guide wheel 4 itself is constructed as a cylindrical structure. This cylinder gradually tapers from both ends towards the middle, forming a double-cone or drum-shaped rotating working surface. Its maximum outer diameter is located in the middle section, slightly larger than the target pipe diameter, while it gradually tapers towards both ends to form a gentle guide slope.

[0044] When the pipe experiences a slight radial offset during placement or movement, its wall will come into contact with the inclined surface of the guide wheel 4. In subsequent movements, the inclined surface will naturally guide the pipe back to the optimal support position in the middle of the wheel.

[0045] The double-cone structure provides a gentle axial restraint on the pipe, preventing it from detaching from the fixture during rapid movement or accidental collisions, thus enhancing operational safety. The guide wheel 4 can be made of high-strength nylon, polyurethane, or rubber-coated steel, ensuring load-bearing capacity while preventing scratches on the PE pipe surface.

[0046] Combination Figure 2 The operating procedure for this support fixture, as shown in the diagram, is as follows: Push the fixture near the hot melt machine, brake the casters, and lower the helical feet for stable support. Operate the lifting mechanism 3 to adjust the receiving frame 2 to a position slightly lower than the center height of the pipe to be welded. Axially transfer the large-diameter PE pipe to the arc-shaped bracket and guide wheel 4 of the receiving frame 2. At this time, the pneumatic swing arm 7 of the swing mechanism 5 will absorb the impact and, through the aforementioned adaptive mechanism, automatically adjust the posture of the swing plate 6 and the receiving frame 2, allowing the pipe to sit smoothly and be in a naturally supported state.

[0047] Operate the hot melt machine so that its clamps hold one end of the pipe. By fine-tuning the lifting mechanism 3 and using the sliding of the guide wheel 4, adjust the pipe to be precisely aligned with the axis of the hot melt machine, and then clamp the pipe.

[0048] When performing the axial movement required for the hot melt process, the operator is completely free from the overhead crane. For example, after end milling, the pipe needs to be moved axially backward about 20 cm for cleaning. The operator simply applies a smooth push to the other end of the pipe, and the pipe rolls backward easily and smoothly on guide wheel 4. Thanks to the dynamic balance support of the swing mechanism, the movement is smooth and without jamming. After cleaning, it is pushed back to the heating plate position for heating.

[0049] After heating is complete, remove the heating plate and manually push the pipe again to move it smoothly and precisely to the docking position along the guide wheel 4 to complete the welding.

[0050] The PE pipe hot-melt support fixture provided by this invention constructs a balanced support system through a swing mechanism, eccentric sliding connection, and a dedicated guide wheel design. This eliminates reliance on overhead cranes and waiting time, enabling rapid and continuous manual operation of the pipe's axial movement, significantly improving the efficiency of the welding process. It effectively compensates for pipe deflection and placement errors, ensuring the parallelism and concentricity of the mating ends, thereby improving welding quality.

[0051] Based on the aforementioned support fixture, this invention also provides a method for hot-melting PE pipes. In practice, two such support fixtures are required. First, the two fixtures are moved to opposite sides of the hot-melt machine and secured in place using the braking device and adjustable feet at the bottom of the support base 1. Then, the lifting mechanisms 3 of both fixtures are operated to adjust their respective receiving frames 2 to a position slightly below the theoretical centerline of the pipe to be welded, preparing for pipe loading.

[0052] Using the workshop's lifting equipment, the first and second PE pipe sections to be welded were respectively hoisted onto the two pre-positioned support fixtures. When the pipes rested on the arc-shaped bracket and guide wheels 4 of the receiving frame 2, The impact force of the falling pipeline is effectively absorbed by the damping medium (such as nitrogen) inside the pneumatic swing arm 7, avoiding rigid collisions. If the pipeline initially tilts due to its hoisting posture or its own inherent characteristics, the eccentric load generated by its weight will cause the support frame 2 to tilt. This tendency is immediately transmitted to the corresponding pneumatic swing arm 7 via the first link 8, forcing the two pneumatic swing arms 7 to produce an asymmetrical movement of contraction and extension. This movement is then forcibly synchronized by the parallelogram synchronization mechanism, transforming into a precise coordinated tilt of the swing disk 6 around its suspension center. The entire support plane (swing disk 6 and support frame 2) can follow the tilt of the pipeline, automatically completing macroscopic posture leveling within seconds, causing the pipeline axis to quickly approach horizontality.

[0053] When the middle of the pipe sags, the force exerted by the pipe wall on the guide wheels 4 on both sides is no longer perpendicular. Its horizontal component will push the slider at the bottom of the support frame 2, causing it to slide along the preset eccentric arc-shaped groove 9 on the swing disk 6. Since the center of the groove 9 is located directly below the ideal axis of the pipe, this sliding will automatically adjust the support point of the support frame 2 to a better position to better balance the internal torque generated by the pipe bending.

[0054] After the pipes are in place, the operator can make slight manual adjustments or fine-tuning via the lifting mechanism 3, using the axial rolling of the guide wheels 4 to initially align the weldable end faces of the two pipe sections with the center area of ​​the hot melt machine. The hot melt machine is then started, and its clamps are used to firmly hold the pipe bodies near their ends. Subsequently, the integrated milling cutter is activated to mill the weldable end faces of the two pipe sections to obtain a highly flat, clean, and perpendicular welding plane.

[0055] After standard milling, maintain the clamping state of the hot melt machine fixture and do not release the pipe. At this time, use a dedicated radial gradient beveling device to perform secondary machining on the outer edge of the milled end face of at least one pipe section. Completely different from the constant-angle beveling formed by traditional turning or grinding, the beveling profile designed in this invention has a continuously decreasing beveling angle from its centerline to both sides. For example, the initial beveling angle at the beveling centerline may be α, and as it extends to both sides, the beveling angle gradually decreases to β, where β < α, forming a smooth curved transition surface.

[0056] Applying radial pressure, the forming device extrudes a gradually decreasing bevel on the outer wall of the pipe end. In existing technologies, the primary purpose of beveling is to remove burrs and facilitate guidance; the bevel angle is typically constant. During final butt welding, if there is a radial alignment error of micrometers to millimeters between the two pipe sections, the contact between the bevel's inclined surface and the outer edge of the other pipe section's end face will generate a large, concentrated lateral impact force. This impact force can easily cause misalignment or distortion of the incompletely molten polymer material, forming defects, and generating internal stress during subsequent cooling, affecting the long-term strength and pressure resistance of the weld.

[0057] The gradual buffer bevel used in this invention has a continuously decreasing bevel angle design, which means that at the moment of contact, the initial contact point is located in the area with the smallest bevel angle, and the contact force is gentle. As the contact goes deeper, the contact point moves to the area with a slightly larger bevel angle, but the increase in contact force is continuous and controllable throughout the process.

[0058] After the beveling is completed, release the clamps on the pipe section that will be moved for docking. The operator manually and smoothly pushes the pipe section backward along the axial direction, moving it 20-30cm along the guide wheels 4 of the support fixture for a predetermined cleaning distance.

[0059] Place the heating plate and perform the standard heating procedure. After heating is complete, remove the heating plate and loosen the clamp on the other pipe section. The operator simultaneously and smoothly moves the two pipe sections towards each other manually. In the instant before final bonding, the gradually decreasing bevel at the end of the first pipe section first contacts the outer edge of the flat end face of the second pipe section. Thanks to the continuously decreasing bevel angle design, the initial contact is extremely gentle. At this moment, the dynamic self-balancing system of the supporting fixture will transfer any radial force generated by manual pushing or a slight misalignment due to residual system tendencies to the receiving frame 2 through the pipe. This force will be immediately absorbed and compensated by the adaptive tilting function of the swing mechanism 5, thus preventing the radial force from being directly and completely transmitted and damaging the end face that is about to be fused together.

[0060] Maintain the docking pressure and enter the pressure holding and cooling stage; after cooling is complete, release the hot melt machine clamps. Operate the lifting mechanisms 3 of the two supporting fixtures to lower the height, so that the welded pipe is separated from the fixtures. Remove the fixtures to complete one welded joint.

[0061] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A PE pipe hot-melt support fixture, characterized in that, It includes a support base (1), a receiving frame (2), a lifting mechanism (3) located between the two, and a swing mechanism (5) set between the lifting mechanism (3) and the receiving frame (2); the receiving frame (2) is provided with a guide wheel (4), and the rotation direction of the guide wheel (4) is set along the axial direction of the PE pipe.

2. The PE pipe hot-melt support fixture according to claim 1, characterized in that, The swing direction of the swing mechanism (5) is set along the circumference of the PE pipe, and the swing center of the swing mechanism (5) is set eccentrically to the axis of the PE pipe.

3. The PE pipe hot-melt support fixture according to claim 1 or 2, characterized in that, The swing mechanism (5) includes a horizontally arranged swing disk (6) and two symmetrically arranged pneumatic swing arms (7); the swing disk (6) is floating above the lifting mechanism (3), the upper end of the pneumatic swing arm (7) is hinged to the bottom of the swing disk (6) through a first hinge shaft, and its lower end is hinged to the side of the lifting mechanism (3) through a second hinge shaft.

4. The PE pipe hot-melt support fixture according to claim 3, characterized in that, The left and right sides of the receiving frame (2) are respectively connected to the corresponding pneumatic swing arm (7) by the inclined first connecting rod (8); the upper end of the first connecting rod (8) is hinged to the side of the receiving frame (2), and the lower end is hinged to the rod body of the corresponding pneumatic swing arm (7).

5. The PE pipe hot-melt support fixture according to claim 3, characterized in that, The swing disk (6) is provided with a sliding groove (9), and a slider that cooperates with the sliding groove (9) is fixed at the corresponding position at the bottom of the receiving frame (2). The sliding groove (9) has an arc-shaped structure, and the center of the arc-shaped structure is set eccentrically downward relative to the axis of the PE pipe.

6. The PE pipe hot-melt support fixture according to claim 5, characterized in that, A flat bearing or sliding pad (10) is provided between the swing disk (6) and the receiving frame (2).

7. The PE pipe hot-melt support fixture according to claim 3, characterized in that, The pneumatic swing arm (7) is a gas spring or damping cylinder with adjustable damping and / or self-resetting function.

8. The PE pipe hot-melt support fixture according to claim 3, characterized in that, A synchronization mechanism is provided between the swing disk (6) and the two pneumatic swing arms (7). The synchronization mechanism includes two synchronization arms (11) that are fixedly connected to the rods of the two pneumatic swing arms (7) respectively, and a second connecting rod (12) that spans both sides. The two ends of the second connecting rod (12) are respectively hinged to the upper ends of the synchronization arms (11) on both sides.

9. The PE pipe hot-melt support fixture according to claim 1, characterized in that, The guide wheel (4) is constructed as a cylindrical structure, which gradually narrows from both ends to the middle section, forming a double-cone or waist-drum shaped rotating working surface.

10. The PE pipe hot-melt support fixture according to claim 1, characterized in that, The lifting mechanism (3) is a scissor lift platform or a screw jack.

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