A device for flattening the ends of heating plastic pipes

Abstract

This invention provides a flattening device for the ends of heating plastic pipes, applicable to the field of plastic pipe flattening processing equipment. The device includes: a support mechanism, divided into a main frame and a secondary frame; a pipe clamping mechanism for clamping and fixing the bent portion of the plastic pipe; a tail-end positioning mechanism for providing auxiliary support and positioning for the end of the plastic pipe furthest from the flattening end; an inner mold for extending into the flattening end and applying a compressive force to its inner wall; an outer mold, corresponding to the inner mold, for applying a compressive force to the outer wall of the flattening end; and a flattening drive mechanism, connected to both the inner and outer molds, for driving the inner and outer molds to achieve either mating compression or separation and resetting. This invention, through the corresponding mating of the outer and inner molds, applies a compressive force to the outer wall of the flattening end, ensuring that the flattening process meets design requirements, achieving high flattening accuracy, and facilitating convenient and efficient demolding from the narrow-mouth flattening end.

Description

Technical Field

[0001] This application relates to the technical field of plastic pipe flattening equipment, and in particular to a device for flattening the ends of heating plastic pipes. Background Technology

[0002] In heating system engineering, thermoplastic pipes such as PPR, PE-RT, and PB have gradually replaced traditional metal pipes as the mainstream material due to their good temperature resistance, creep resistance, and ease of installation.

[0003] These plastic pipes need to be reliably connected to core components such as heating manifolds and regional headers. The quality of the hot-melt or electrofusion welding between the pipe ends and the headers directly determines the sealing performance, heat transfer efficiency, and operational safety of the heating system.

[0004] In the assembly process of centralized heating pipe networks and large building heating systems, to improve space utilization and system integration, multiple plastic pipes need to be densely arranged along the side wall of the manifold (the center-to-center distance between adjacent pipes is usually only 1.2-1.5 times the outer diameter of the pipe) and welded simultaneously. Since plastic pipes are manufactured with a standard circular cross-section, when multiple pipes are arranged parallel and close together, a narrow gap of ≤5mm will form between the ends of adjacent pipes connecting to the manifold. Welding heating plastic pipes requires precise heating by inserting the heating end of a specialized welding torch (thermofusion welding torch or electrofusion welding machine) deep into the contact surface between the port and the manifold. The narrow gap prevents the welding tool from effectively penetrating, making it difficult to ensure uniform heating and easily leading to defects such as incomplete fusion and insufficient weld depth. In severe cases, this can cause leaks and heat loss during the heating season.

[0005] To solve the above assembly problems, the industry generally adopts a pretreatment process of flattening the welded ends of plastic pipes, thereby expanding the operating space between adjacent pipes by changing the cross-sectional shape of the port (reducing the lateral width while retaining the longitudinal structural strength).

[0006] The existing plastic pipe flattening equipment has several shortcomings. First, the positioning mechanism is poorly designed. Heating plastic pipes often have bends at certain angles due to on-site wiring requirements. General-purpose equipment lacks dedicated clamping and positioning components for the bends, which can easily lead to radial or axial displacement of the pipe during flattening, resulting in poor end forming accuracy. Second, the forming method is simplistic, achieving deformation only through unilateral extrusion of the outer wall without considering the thermoplastic characteristics of plastic pipes. This can easily lead to collapse and wrinkling of the inner wall at the end, and the cross-sectional shape of the flattened end cannot accurately match the gap requirements of densely arranged manifolds. Third, there is a lack of temperature control mechanisms. Plastic pipes have low rigidity at room temperature, and simple mechanical extrusion can easily cause springback deformation, affecting the fit of subsequent welding.

[0007] To address these issues, a device for flattening the ends of heating plastic pipes is proposed. Summary of the Invention

[0008] The purpose of this application is to address the problems of inaccurate positioning, poor forming quality, and low adaptability of existing general pipe flattening devices during plastic pipe processing. Compared with existing technologies, this application provides a heating plastic pipe end flattening device, comprising:

[0009] The support mechanism is divided into a main frame and a sub-frame, wherein the sub-frame is rotatably connected to the main frame about a direction parallel to the axis of the plastic tube;

[0010] The pipe clamping mechanism is located on one side of the main frame and is used to clamp and fix the bent part of the plastic pipe.

[0011] The tail end positioning mechanism, located on the sub-frame, is used to provide auxiliary support and positioning for the end of the plastic tube that is far from the flattened end.

[0012] The inner mold is used to extend into the flattened end and apply compressive force to its inner wall; it has a built-in heating unit.

[0013] The outer mold, which corresponds to the inner mold, is used to apply extrusion force to the outer wall of the flattened end and has a built-in heating unit.

[0014] The flattening drive mechanism is connected to the inner mold and the outer mold respectively, and is used to drive the inner mold and the outer mold to achieve mate compression or separation and reset.

[0015] Furthermore, the flattened end of the plastic tube formed by this device has a conical shell structure with an elliptical bottom and a circular top. The outer diameter of the circular top of the flattened end is equal to the outer diameter of the plastic tube. The maximum outer radius of the elliptical bottom of the flattened end is greater than the outer diameter of the plastic tube, and the minimum outer radius is smaller than the outer diameter of the plastic tube.

[0016] Furthermore, the inner mold includes an inner mold base fixedly installed on the main frame. The end of the inner mold base facing the flattened end is provided with two sets of symmetrically distributed flipping mold cores. One end of each set of flipping mold cores is fixedly connected to a flipping lever arm. The inner mold base is provided with a flipping limiting groove adapted to the flipping lever arm. The flipping lever arm is rotatably connected to the flipping limiting groove through a pin.

[0017] A sliding block is also provided between the two sets of flipping mold cores. A drive rod is fixedly connected to one end of the sliding block near the inner mold base. A sliding groove with an axial through-hole is opened in the middle of the inner mold base. The drive rod is slidably connected in the sliding groove.

[0018] Furthermore, the upper and lower sides of the sliding block are symmetrically provided with alignment protrusions, the distance between the two sets of alignment protrusions gradually increases in the direction away from the inner mold base, and the inner sides of the two sets of flipping mold cores are provided with alignment grooves that are adapted to the shape of the alignment protrusions.

[0019] The overall outer contour formed by the two sets of flipping mold cores and the sliding block after they are aligned matches the inner wall contour of the flattened end.

[0020] Furthermore, the outer mold includes two sets of mating modules arranged opposite each other. Each set of mating modules has a mold cavity on its opposite side. The overall inner contour formed by the mating of the two sets of mold cavities matches the outer wall contour of the flattened end.

[0021] Furthermore, the end of the sliding block away from the drive rod is also equipped with a clamping inner support. The clamping inner support includes an inner support bladder that is detachably connected to the end of the sliding block by a thread. An elastic sealing plug is fixedly connected to the end of the inner support bladder away from the sliding block. The interior of the inner support bladder is filled with magnetorheological fluid.

[0022] Furthermore, the main frame has a horizontal right-angle support structure, and the flattening drive mechanism and the pipe clamping mechanism are respectively installed on the two right-angle sides of the main frame. The pipe clamping mechanism includes a pipe clamping wheel and a clamping cylinder arranged opposite to each other. A fixed clamping block is fixedly connected to one side of the pipe clamping wheel, and a movable clamping block that cooperates with the fixed clamping block is fixedly connected to the output end of the clamping cylinder.

[0023] Both the fixed clamping block and the moving clamping block have built-in electromagnets to enhance clamping stability.

[0024] Furthermore, the flattening drive mechanism includes an axial telescopic cylinder and two sets of lateral telescopic cylinders. The output end of the axial telescopic cylinder is coaxially and fixedly connected to the drive rod. The output ends of the two sets of lateral telescopic cylinders are arranged opposite to each other and are respectively fixedly connected to two sets of mating modules.

[0025] Furthermore, the rotation axis of the sub-frame relative to the main frame is coaxial with the central axis of the tube clamping wheel;

[0026] The tail end positioning mechanism includes a positioning cylinder fixed on the sub-frame. The output end of the positioning cylinder is fixedly connected to an end plug, and an air supply nozzle is integrated on the end plug. The input end of the air supply nozzle is connected to a positive pressure air supply unit through a high-pressure pipeline.

[0027] Compared to existing technologies, the advantages of this application are:

[0028] After being flattened by this device, the maximum lateral width of the conical end is reduced, and the gap between adjacent tube ends can be expanded to meet the operational requirements of subsequent port connection. This invention uses an outer mold and an inner mold that are matched in an inner-outer correspondence to apply a squeezing force to the outer wall of the flattened end, ensuring that the flattening molding meets the design requirements, with high flattening accuracy and convenient and efficient demolding from the narrow-mouth flattened end. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this application;

[0030] Figure 2 This is a side view of the structure of this application;

[0031] Figure 3 This is a schematic diagram of the structure of the plastic pipe proposed in this application;

[0032] Figure 4 This is a perspective view of the flattened end structure proposed in this application;

[0033] Figure 5 This is a schematic diagram of the partially exploded structure of the inner and outer molds proposed in this application;

[0034] Figure 6 This is a schematic diagram of the exploded structure of the inner mold proposed in this application;

[0035] Figure 7 This is a partial cross-sectional structural diagram of this application;

[0036] Figure 8 This is a schematic diagram showing the comparison of the states of the flipping mold core and the sliding block when they are engaged and separated, as proposed in this application.

[0037] Figure 9 This is a schematic cross-sectional view of the rotating mold core and the sliding block as proposed in this application.

[0038] Figure 10 This is a schematic cross-sectional view of the flipping mold core and the sliding block as proposed in this application.

[0039] Explanation of the labels in the diagram:

[0040] 1. Supporting mechanism; 11. Main frame; 12. Sub-frame;

[0041] 2. Plastic tube; 21. Flattened end;

[0042] 3. Pipe clamping mechanism; 31. Pipe clamping wheel; 32. Fixed clamping block; 33. Moving clamping block; 34. Clamping cylinder;

[0043] 4. Tail-end positioning mechanism; 41. Positioning cylinder; 42. End plug; 43. Air supply nozzle;

[0044] 5. Flattening drive mechanism; 51. Axial telescopic cylinder; 52. Lateral telescopic cylinder;

[0045] 6. Inner mold; 61. Inner mold base; 611. Flipping limiting groove; 612. Slide groove; 62. Flipping mold core; 621. Flipping lever arm; 622. Alignment groove; 63. Sliding block; 631. Drive rod; 632. Alignment protrusion;

[0046] 7. Outer mold; 71. Mating module; 72. Mold cavity;

[0047] 8. Clamping internal support; 81. Internal support bladder; 82. Elastic sealing plug. Detailed Implementation

[0048] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0049] Example:

[0050] This invention provides a device for flattening the ends of heating plastic pipes. Please refer to [link / reference]. Figure 1 - Figure 10 It includes a support mechanism 1, a pipe clamping mechanism 3, a tail end positioning mechanism 4, an inner mold 6, an outer mold 7, and a flattening drive mechanism 5.

[0051] For details, please refer to the following first. Figure 1 The support mechanism 1 is divided into a main frame 11 and a sub-frame 12. The sub-frame 12 is rotatably connected to the main frame 11 in a direction parallel to the axis of the plastic tube 2. While providing stable support for the main frame 11, the sub-frame 12 can be adapted to the positioning requirements of plastic tubes 2 with different lengths and bending angles through rotation.

[0052] The pipe clamping mechanism 3 is located on one side of the main frame 11 and is used to clamp and fix the bent part of the plastic pipe 2 to prevent the pipe from shaking or shifting during the flattening process. The main frame 11 has a horizontal right-angle support structure. The pipe clamping mechanism 3 is installed on one right-angle side of the main frame 11 and includes a pipe clamping wheel 31 and a clamping cylinder 34 arranged opposite each other. A fixed clamping block 32 is fixedly connected to one side of the pipe clamping wheel 31, and a movable clamping block 33 that cooperates with the fixed clamping block 32 is fixedly connected to the output end of the clamping cylinder 34. Electromagnets are built into the fixed clamping block 32 and the movable clamping block 33.

[0053] The tail-end positioning mechanism 4 is mounted on the auxiliary frame 12 and is used to provide auxiliary support and positioning for the end of the plastic tube 2 that is away from the flattened end 21. The rotation axis of the auxiliary frame 12 relative to the main frame 11 is coaxial with the central axis of the tube clamping wheel 31 to ensure the stability of the axis after the plastic tube 2 is positioned. The tail-end positioning mechanism 4 includes a positioning cylinder 41 fixed on the auxiliary frame 12. The output end of the positioning cylinder 41 is fixedly connected to an end plug 42. An air supply nozzle 43 is integrated on the end plug 42. The input end of the air supply nozzle 43 is connected to a positive pressure air supply unit through a high-pressure pipeline. After the end plug 42 is inserted into the tail end of the plastic tube 2, the positive pressure air supply unit can introduce positive pressure gas into the plastic tube 2 through the air supply nozzle 43 to cooperate with the subsequent expansion support of the clamping inner support 8.

[0054] Please refer to this first. Figure 4 - Figure 6The inner mold 6 is used to extend into the flattening end 21 and apply a compressive force to its inner wall. It includes an inner mold base 61 fixedly installed on the main frame 11. The end of the inner mold base 61 facing the flattening end 21 is provided with two sets of symmetrically distributed flipping mold cores 62. One end of each set of flipping mold cores 62 is fixedly connected to a flipping lever arm 621. The inner mold base 61 is provided with a flipping limiting groove 611 adapted to the flipping lever arm 621. The flipping lever arm 621 is rotatably connected to the flipping limiting groove 611 by a pin. A sliding block 63 is also provided between the two sets of flipping mold cores 62. The end of the sliding block 63 near the inner mold base 61 is fixedly connected to a drive rod 631. The middle part of the inner mold base 61 is provided with a sliding groove 612 that runs through the axis. The drive rod 631 is slidably connected to the sliding groove 612.

[0055] The upper and lower sides of the slide block 63 are symmetrically provided with alignment protrusions 632. The distance between the two sets of alignment protrusions 632 gradually increases in the direction away from the inner mold base 61. The inner sides of the two sets of flipping mold cores 62 are provided with alignment grooves 622 that are adapted to the shape of the alignment protrusions 632. The overall outer contour formed by the two sets of flipping mold cores 62 and the slide block 63 after they are aligned matches the inner wall contour of the flattened end 21.

[0056] The end of the sliding block 63 away from the drive rod 631 is also equipped with a clamping inner support 8. The clamping inner support 8 includes an inner support bladder 81 that is detachably connected to the end of the sliding block 63 by a thread. An elastic sealing plug 82 is fixedly connected to the end of the inner support bladder 81 away from the sliding block 63. The inner support bladder 81 is filled with magnetorheological fluid. When the positive pressure air supply unit introduces positive pressure gas into the plastic tube 2 through the air supply nozzle 43, the air pressure is increased to the elastic sealing plug 82, causing the elastic sealing plug 82 to move inside the plastic tube 2 and squeeze the inner support bladder 81, so that the inner support bladder 81 completely fills the part of the plastic tube 2 that is clamped by the pipe clamping mechanism 3. At this time, in conjunction with the electromagnetic field generated by the energization of the electromagnets inside the fixed clamping block 32 and the moving clamping block 33, the magnetorheological fluid in the inner support bladder 81 is solidified, which can enhance the stability of the inner support. This is suitable for the clamping requirements of thin-walled plastic tubes 2, maintaining the stability of the clamped part and avoiding deformation.

[0057] Please refer to 5 first. The outer mold 7 and the inner mold 6 are in a corresponding fit to apply a squeezing force to the outer wall of the flattened end 21. It includes two sets of mating modules 71 arranged opposite each other. Each set of mating modules 71 has a mold cavity 72 on one side opposite to the other. The overall inner contour formed by the mating of the two sets of mold cavities 72 matches the outer contour of the flattened end 21.

[0058] The flattening drive mechanism 5 is connected to the inner mold 6 and the outer mold 7 respectively, and is used to drive the inner mold 6 and the outer mold 7 to achieve mating and extrusion or separation and reset. It is installed on another right-angle side of the main frame 11 and includes an axial telescopic cylinder 51 and two sets of lateral telescopic cylinders 52. The output end of the axial telescopic cylinder 51 is coaxially fixedly connected to the drive rod 631. The output ends of the two sets of lateral telescopic cylinders 52 are arranged opposite to each other and are fixedly connected to the two sets of mating modules 71 respectively.

[0059] The flattened end 21 of the plastic tube 2 formed by this device has a conical shell structure with an elliptical bottom and a circular top. The outer diameter of the circular top of the flattened end 21 is equal to the outer diameter of the plastic tube 2. The maximum outer radius of the elliptical bottom is greater than the outer diameter of the plastic tube 2, and the minimum outer radius is less than the outer diameter of the plastic tube 2. This structure can effectively expand the operating space between adjacent plastic tubes 2.

[0060] The core working logic of this boiler-specific plastic pipe flattening device is precise positioning, internal and external coordination, and controllable forming. Through the orderly linkage of various mechanisms, it achieves efficient and high-precision flattening of the ends of plastic pipes.

[0061] Specifically, the main frame 11 and the auxiliary frame 12 of the support mechanism 1 form a support system with the main frame fixed and the auxiliary frame adjustable. The auxiliary frame 12 rotates in a direction parallel to the axis of the plastic tube 2, and the position of the tail end positioning mechanism 4 can be adjusted according to the length of the plastic tube 2. Its rotation axis is coaxial with the axis of the tube clamping wheel 31 to ensure the axial deviation of the plastic tube 2 after clamping. At the same time, the rotation angle of the auxiliary frame 12 can be adjusted to meet the clamping requirements of plastic tubes 2 with different bending angles.

[0062] The pipe clamping mechanism 3 adopts mechanical clamping. The pipe clamping wheel 31 first provides initial support for the bent part, and the clamping cylinder 34 pushes the moving clamping block 33 and the fixed clamping block 32 to fit the pipe body, so as to avoid the pipe body from shifting in the axial and radial directions.

[0063] The positioning cylinder 41 of the tail end positioning mechanism 4 pushes the end plug 42 into the tail end of the tube, and positive pressure gas is introduced in conjunction with the positive pressure air supply unit. On the one hand, the roundness of the non-flattened area is maintained by the gas pressure, and on the other hand, it is supported by the expansion of the subsequent clamping inner support 8.

[0064] Please refer to this first. Figure 6 - Figure 10The inner mold 6 and the outer mold 7 form a synergistic mechanism of inner support and outer pressure. When the flattening action is performed, the lateral telescopic cylinder 52 pushes the two sets of mating modules 71 to make a preliminary pre-displacement that is relatively close. At this time, the bottom of the plastic tube 2 is pre-flattened and initially forms an elliptical outline, providing space for the inner mold 6 to enter. Then, the axial telescopic cylinder 51 of the flattening drive mechanism 5 first drives the drive rod 631 to move axially along the slide groove 612. The sliding block 63, with the alignment protrusion 632, extends into the pre-flattened end of the plastic tube 2. Since the spacing of the alignment protrusion 632 gradually increases, when the sliding block 63 enters the plastic tube 2 first, the two sets of flipping mold cores 62 flip in the direction of proximity to form the smallest cross-section. Subsequently, the magnetic flux inside the inner support bladder 81 is solidified by the magnetic field, forming a rigid inner support structure to prevent the inner wall from collapsing during molding. At this time, the sliding block 63 is displaced in the opposite direction under the traction of the drive rod 631. The alignment protrusion 632 squeezes the alignment groove 622, causing the two sets of flipping mold cores 62 to flip away from each other until they are completely attached to the inner wall of the flattened end 21. During this process, the flipping limit groove 611 restricts the rotation angle of the flipping lever arm 621 to ensure that the inner mold contour accurately matches the design requirements.

[0065] At the same time, the lateral telescopic cylinder 52 pushes the two sets of mating modules 71 to continue to move relative to each other. The mold cavity 72 is completely in contact with the outer wall of the plastic tube 2. The inner and outer molds apply extrusion pressure together, causing the tube material to undergo plastic deformation. At the same time, the heating units in the inner mold 6 and the outer mold 7 work simultaneously, causing the flattened end to soften. After cooling, it is finally formed into a conical structure with an elliptical bottom and a round top.

[0066] After flattening, each mechanism resets in reverse order of forming. The axial telescopic cylinder 51 retracts, causing the sliding block 63 to move away from the inner mold base 61, so that the two sets of flipping mold cores 62 flip in the direction of proximity, forming the minimum cross-section shape again and retracting. This allows the flipping mold core 62 and the sliding block 63 to detach from the formed flattened end 21, waiting for the next flattening action. At the same time, the lateral telescopic cylinder 52 drives the mating module 71 to separate, the positive pressure air supply unit stops supplying air, and the positioning cylinder 41 retracts the end plug 42. The electromagnet is de-energized, and the clamping cylinder 34 drives the moving clamp block 33 to reset, so that the formed plastic tube 2 can be taken out, completing a single processing cycle.

[0067] When existing circular cross-section plastic tubes are densely arranged and connected on a heat exchanger, the gap between adjacent tube ends is small, making it difficult for general tools to reach in and operate. After being flattened by this device, the maximum lateral width of the conical end is reduced, and the gap between adjacent tube ends can be expanded to meet the operational requirements of subsequent processes. This invention uses an outer mold 7 and an inner mold 6 that are matched in an inner-outer correspondence to apply a squeezing force to the outer wall of the flattened end 21, ensuring that the flattening molding meets the design requirements, with high flattening accuracy and convenient and efficient demolding from the narrow-mouth flattened end.

[0068] In response to the characteristic that plastic pipes often have bends, the pipe clamping mechanism 3 uses the pipe clamping wheel to support and the clamping block to clamp, which effectively controls the radial runout of the bend. The coaxial design of the auxiliary frame 12 and the pipe clamping wheel 31 ensures that the axis of the plastic pipe 2 is coaxial with the axis of the inner mold 6, avoiding eccentricity at the flattened end.

[0069] After the inner mold 6's flipping core 62 and the sliding block 63 are aligned, the concentricity with the inner wall of the flattened end 21 is high. With the rigid support of the magnetorheological fluid inner support, the deformation of the inner wall can be eliminated. The rotation of the auxiliary frame 12, combined with the extension and retraction stroke of the positioning cylinder 41, can adapt to the clamping requirements of pipes with different diameters, lengths and bending angles, and has strong adaptability.

[0070] The above description is only the best implementation method adopted in this application in combination with current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A heating plastic pipe port flattening device, characterized by, include: The support mechanism (1) is divided into a main frame (11) and a sub-frame (12). The sub-frame (12) is rotatably connected to the main frame (11) in a direction parallel to the axis of the plastic tube (2). The pipe clamping mechanism (3) is located on one side of the main frame (11) and is used to clamp and fix the bent part of the plastic pipe (2); The tail end positioning mechanism (4) is set on the sub-frame (12) and is used to provide auxiliary support and positioning for the end of the plastic tube (2) that is far from the flattened end (21); The inner mold (6) is used to extend into the flattened end (21) and apply a squeezing force to its inner wall, and has a built-in heating unit; The outer mold (7) is in a corresponding fit with the inner mold (6) and is used to apply extrusion force to the outer wall of the flattened end (21). It has a built-in heating unit. The flattening drive mechanism (5) is connected to the inner mold (6) and the outer mold (7) respectively, and is used to drive the inner mold (6) and the outer mold (7) to achieve the mating and extrusion or separation and reset. The inner mold (6) includes an inner mold base (61) fixedly installed on the main frame (11). The inner mold base (61) has two sets of symmetrically distributed flipping mold cores (62) at the end facing the flattened end (21). One end of each set of flipping mold cores (62) is fixedly connected to a flipping lever arm (621). The inner mold base (61) has a flipping limiting groove (611) adapted to the flipping lever arm (621). The flipping lever arm (621) is rotatably connected to the flipping limiting groove (611) by a pin. A sliding block (63) is also provided between the two sets of flipping mold cores (62). A drive rod (631) is fixedly connected to one end of the sliding block (63) near the inner mold base (61). A sliding groove (612) is provided in the middle of the inner mold base (61) and runs through it along the axial direction. The drive rod (631) is slidably connected to the sliding groove (612). The upper and lower sides of the row block (63) are symmetrically provided with alignment protrusions (632). The distance between the two sets of alignment protrusions (632) gradually increases in the direction away from the inner mold base (61). The inner sides of the two sets of flip mold cores (62) are provided with alignment grooves (622) that are adapted to the shape of the alignment protrusions (632). The overall outer contour formed by the two sets of flipping mold cores (62) and the sliding block (63) after they are engaged matches the inner wall contour of the flattened end (21); The outer mold (7) includes two sets of mating modules (71) arranged opposite to each other. Each set of mating modules (71) has a mold cavity (72) on one side opposite to the other. The overall inner contour formed by the mating of the two sets of mold cavities (72) matches the outer wall contour of the flattened end (21). The end of the sliding block (63) away from the drive rod (631) is also equipped with a clamping inner support (8). The clamping inner support (8) includes an inner support bladder (81) that is detachably connected to the end of the sliding block (63) by a thread. An elastic sealing plug (82) is fixedly connected to the end of the inner support bladder (81) away from the sliding block (63). The interior of the inner support bladder (81) is filled with magnetorheological fluid.

2. A device for flattening the end of a plastic pipe for heating according to claim 1, characterized in that The flattened end (21) of the plastic tube (2) formed by this device has a conical shell structure with an elliptical bottom and a circular top. The outer diameter of the circular top of the flattened end (21) is equal to the outer diameter of the plastic tube (2). The maximum outer radius of the elliptical bottom of the flattened end (21) is greater than the outer diameter of the plastic tube (2), and the minimum outer radius is less than the outer diameter of the plastic tube (2).

3. The heating plastic pipe end flattening device according to claim 1, characterized in that, The main frame (11) has a horizontal right-angle support structure. The flattening drive mechanism (5) and the pipe clamping mechanism (3) are respectively installed on the two right-angle sides of the main frame (11). The pipe clamping mechanism (3) includes a pipe clamping wheel (31) and a clamping cylinder (34) arranged opposite to each other. A fixed clamping block (32) is fixedly connected to one side of the pipe clamping wheel (31). A movable clamping block (33) that cooperates with the fixed clamping block (32) is fixedly connected to the output end of the clamping cylinder (34). Both the fixed clamping block (32) and the movable clamping block (33) have built-in electromagnets to enhance clamping stability.

4. The heating plastic pipe end flattening device according to claim 3, characterized in that, The flattening drive mechanism (5) includes an axial telescopic cylinder (51) and two sets of lateral telescopic cylinders (52). The output end of the axial telescopic cylinder (51) is coaxially and fixedly connected to the drive rod (631). The output ends of the two sets of lateral telescopic cylinders (52) are arranged opposite to each other and are respectively fixedly connected to two sets of mating modules (71).

5. A flattening device for the end of a heating plastic pipe according to claim 3, characterized in that, The rotation axis of the subframe (12) relative to the main frame (11) is coaxial with the central axis of the tube clamping wheel (31); The tail end positioning mechanism (4) includes a positioning cylinder (41) fixed on the sub-frame (12). The output end of the positioning cylinder (41) is fixedly connected to an end plug (42). An air supply nozzle (43) is integrated on the end plug (42). The input end of the air supply nozzle (43) is connected to a positive pressure air supply unit through a high-pressure pipeline.

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