Bracket-free prefabricated directly-buried thermal insulation pipe foaming mold

Abstract

The invention belongs to the technical field of foaming molds, particularly relates to a non-support prefabricated directly-buried thermal insulation pipe foaming mold, and aims to solve the problems that when polyurethane foam is filled, it cannot be ensured that a steel pipe is located at the center line position of an outer protective layer, so that flowing of the polyurethane foam in gaps is not facilitated, the polyurethane foam is not uniformly filled, the thermal insulation performance of a thermal insulation pipe is reduced, and the production cost is reduced. According to the scheme, the mold comprises a hollow lower mold; the hollow upper mold is connected to one side of the hollow lower mold through a hinge, and one side of the hollow upper mold is fixedly connected with a tool handle; according to the non-support prefabricated directly-buried thermal insulation pipe foaming mold, it is guaranteed that a steel pipe is located at the center line position of an outer protection layer when polyurethane foam is filled, flowing of the polyurethane foam in gaps is facilitated, the polyurethane foam is evenly filled, and the thermal insulation performance of a thermal insulation pipe is improved.

Description

Technical Field

[0001] The invention relates to the technical field of foaming moulds, in particular to a support-free prefabricated direct-buried thermal insulation pipe foaming mould. Background Art

[0002] The pre-buried insulation pipe foaming mold is a tool used in the production of prefabricated direct-buried insulation pipe. It is primarily used to inject polyurethane foam between the steel pipe and the outer sheath to form the insulation layer. This mold ensures that the polyurethane foam fills the gap between the steel pipe and the outer sheath, forming a closed-cell structure and achieving excellent insulation effect.

[0003] When filling the gap between the steel pipe and the outer sheath with polyurethane foam, the existing foaming mold places the steel pipe and the outer sheath above the foaming mold, which cannot ensure that the steel pipe is at the center line position of the outer sheath, which is not conducive to the flow of polyurethane foam in the gap, resulting in uneven filling of the polyurethane foam and reduced thermal insulation performance of the insulated pipe. Summary of the Invention

[0004] The invention discloses a support-free prefabricated direct-buried thermal insulation pipe foaming mold, which aims to solve the technical problem in the background technology that the polyurethane foam is unevenly filled and the thermal insulation performance of the thermal insulation pipe is reduced.

[0005] The present invention provides a prefabricated foaming mold for directly buried thermal insulation pipes without a support, comprising a hollow lower mold;

[0006] A hollow upper mold, wherein the hollow upper mold is connected to one side of the hollow lower mold through a hinge, and a tooling handle is fixedly connected to one side of the hollow upper mold;

[0007] A high-pressure injection tube is installed on the hollow upper mold, and arc spaces are opened inside the hollow upper mold and the hollow lower mold;

[0008] A foaming module is provided on the hollow lower mold and the hollow upper mold. The foaming module includes two tooling support plates. Two guide holes are provided on one side of the two tooling support plates. The interiors of the multiple guide holes are slidably connected with guide cylinders, and one end of the two guide cylinders located on the same side is fixedly connected to the same horizontal movable frame. A mounting circular opening is provided on one side of the two horizontal movable frames, and the interiors of the two mounting circular openings are fixedly connected with tooling cylinders. Through the foaming module, it is ensured that the steel pipe is at the center line position of the outer protective layer when the polyurethane foam is filled, which is beneficial for the polyurethane foam to flow in the gap, so that the polyurethane foam is filled evenly, thereby improving the thermal insulation performance of the insulation pipe.

[0009] In a preferred solution, one side of the two tooling cylinders is fixedly connected to a mounting plate, and the two mounting plates are fixedly connected to a limiting round rod at equal distances on the inner side of the tooling cylinder, one side of the limiting round rod is fixedly connected to the inner side of the tooling cylinder, and the outer sides of multiple limiting round rods located on the same side are slidably connected to the same adjusting slider, and the inner side of the two tooling cylinders is fixedly connected to an electric hydraulic cylinder, and the driving end of the electric hydraulic cylinder is fixedly connected to one side of the adjusting slider.

[0010] In a preferred solution, the two mounting plates are fixedly connected with tooling blocks at equal distances on the inner side facing the tooling cylinder, multiple tooling blocks are movably connected with rotating shafts on one side of the adjusting slider, the outsides of multiple rotating shafts are fixedly connected with adjusting rods, one side of the two tooling support plates is fixedly connected with two electric telescopic rods, the driving ends of the multiple electric telescopic rods are fixedly connected with a connecting plate, and one side of the connecting plate is fixedly connected to one side of the guide cylinder.

[0011] In a preferred solution, a circular hole is provided on both sides of the multiple adjusting rods, and the interiors of the two opposite circular holes are connected to a rotating shaft through a bearing, the exteriors of the two rotating shafts on the same side are movably connected to the same adjusting plate, the exteriors of the multiple adjusting plates are provided with the same working steel pipe, an outer protective tube is inserted into the exterior of the working steel pipe, the working steel pipe and the outer protective tube are located inside the circular arc space of the hollow lower mold and the hollow upper mold, an injection hole is provided on one side of the exterior of the outer protective tube, and one end of the high-pressure injection tube is located inside the injection hole.

[0012] In a preferred solution, the inner side of the hollow lower mold and the hollow upper mold is provided with perforations at equal distances, and the inner sides of the multiple perforations are slidably connected with lifting cylinders, the sides of the multiple lifting cylinders facing the arc space are fixedly connected with arc-shaped limit plates, the arc surfaces of the multiple arc-shaped limit plates are fixedly connected with telescopic springs at equal distances, and one side of the multiple telescopic springs located on the same arc-shaped limit plate is fixedly connected with the same arc-shaped impact plate, and the arc surface of the arc-shaped impact plate is against the outside of the outer protective tube.

[0013] In a preferred solution, one side of the multiple lifting cylinders is fixedly connected to a U-shaped mounting frame 2, and both sides of the multiple U-shaped mounting frames 2 are provided with a circular hole 2, the interiors of the two opposite circular holes 2 are connected to the same roller through a bearing, and one side of the multiple U-shaped mounting frames 2 is fixedly connected to a reset spring, one side of the multiple reset springs located on the upper side is fixedly connected to the inner side of the hollow upper mold, and one side of the multiple reset springs located on the lower side is fixedly connected to the inner side of the hollow lower mold.

[0014] In a preferred solution, a U-shaped mounting frame 1 is fixedly connected to one side of the inner portion of the hollow lower mold and the hollow upper mold at equal distances, and circular holes 3 are provided on both sides of the plurality of U-shaped mounting frames 1. Cams are connected to the inner portions of the two opposite circular holes 3 through bearings, and the protruding portion of the cam is against the outer portion of the roller.

[0015] In a preferred solution, one end of each of the cams is fixedly connected to a pulley, and the outsides of the multiple pulleys located at the same level are all connected to the same belt for transmission, and the inner side of the hollow lower mold and the hollow upper mold is fixedly connected to a drive motor, and the driving end of the drive motor is connected to one side of the cam through a coupling.

[0016] In a preferred solution, a limiting circular opening is provided on one side of the two horizontally movable frames, and the interiors of the multiple limiting circular openings are slidably connected to the limiting cylinders, one end of the two limiting cylinders located on the same side are fixedly connected to the same sealing plate, one side of the two sealing plates are fixedly connected to two extrusion springs, one side of the extrusion spring is fixedly connected to one side of the horizontally movable frame, and the extrusion spring surrounds the outside of the limiting cylinder.

[0017] In a preferred embodiment, ventilation holes are provided at equal distances on the inner sides of the arc spaces of the hollow lower mold and the hollow upper mold, and air inlet holes are provided on one side of the hollow lower mold and the hollow upper mold, and temperature delivery pipes are fixedly connected to the inside of the two air inlet holes.

[0018] From the above, it can be seen that the support-free prefabricated direct-buried insulation pipe foaming mold provided by the present invention has the beneficial effect of ensuring that the steel pipe is at the center line position of the outer protective layer when the polyurethane foam is filled, which is conducive to the flow of polyurethane foam in the gap, making the polyurethane foam filled evenly and improving the insulation performance of the insulation pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of a support-free prefabricated direct-buried thermal insulation pipe foaming mold proposed by the present invention;

[0020] Figure 2 This is a side structural schematic diagram of a support-free prefabricated direct-buried thermal insulation pipe foaming mold proposed by the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of a mold for a prefabricated direct-buried thermal insulation pipe foaming mold without a support proposed by the present invention;

[0022] Figure 4 This is a schematic diagram of the foaming module structure of a support-free prefabricated direct-buried thermal insulation pipe foaming mold proposed by the present invention;

[0023] Figure 5 for Figure 3 A schematic diagram of the enlarged structure of part A;

[0024] Figure 6 This is a schematic diagram of the tooling cylinder structure of a prefabricated direct-buried insulation pipe foaming mold without a support proposed by the present invention;

[0025] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of part B.

[0026] Figure: 1, hollow lower mold; 2, hollow upper mold; 3, tooling handle; 4, high-pressure injection tube; 5, temperature delivery tube; 6, vent; 7, foaming module; 701, tooling support plate; 702, guide cylinder; 703, horizontal moving frame; 704, electric telescopic rod; 705, connecting plate; 706, tooling cylinder; 707, limit rod; 708, electric hydraulic cylinder; 709, adjustment slider; 710, tooling block; 711, adjustment rod; 712, rotation Shaft; 713, rotating shaft; 714, adjusting plate; 715, mounting plate; 716, U-shaped mounting frame 1; 717, cam; 718, driving motor; 719, lifting cylinder; 720, reset spring; 721, U-shaped mounting frame 2; 722, roller; 723, arc-shaped limit plate; 724, telescopic spring; 725, arc-shaped impact plate; 726, belt; 8, outer protective tube; 9, working steel pipe; 10, limit cylinder; 11, extrusion spring; 12, blocking plate. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] The present invention discloses a bracket-free prefabricated direct-buried thermal insulation pipe foaming mold, which is mainly used in scenarios where polyurethane foam filling is uneven, thereby reducing the thermal insulation performance of the thermal insulation pipe.

[0029] Reference Figure 1-Figure 7 , a prefabricated direct-buried insulation pipe foaming mold without a support, comprising a hollow lower mold 1;

[0030] The hollow upper mold 2 is connected to one side of the hollow lower mold 1 through a hinge, and a tooling handle 3 is fixedly connected to one side of the hollow upper mold 2;

[0031] The high-pressure injection tube 4 is installed on the hollow upper mold 2. The hollow upper mold 2 and the hollow lower mold 1 both have arc spaces inside.

[0032] Foaming module 7, foaming module 7 is arranged on the hollow lower mold 1 and the hollow upper mold 2, the foaming module 7 includes two tooling support plates 701, and two guide holes are provided on one side of the two tooling support plates 701. The interior of the multiple guide holes is slidably connected with a guide cylinder 702, and one end of the two guide cylinders 702 located on the same side is fixedly connected to the same horizontal movable frame 703, and one side of the two horizontal movable frames 703 is provided with a mounting circular opening, and the interior of the two mounting circular openings is fixedly connected with a tooling cylinder 706. Through the foaming module 7, it is ensured that the steel pipe is at the center line position of the outer sheath when the polyurethane foam is filled, which is beneficial for the polyurethane foam to flow in the gap, so that the polyurethane foam is filled evenly, thereby improving the thermal insulation performance of the insulation pipe.

[0033] Reference Figures 1-6 , one side of the two tooling cylinders 706 is fixedly connected with a mounting plate 715, and the two mounting plates 715 are fixedly connected with a limiting round rod 707 at equal distances on the inner side of the tooling cylinder 706, one side of the limiting round rod 707 is fixedly connected to the inner side of the tooling cylinder 706, and the outer sides of multiple limiting round rods 707 located on the same side are all slidably connected with the same adjusting slider 709, and the inner side of the two tooling cylinders 706 is fixedly connected with an electric hydraulic cylinder 708, and the driving end of the electric hydraulic cylinder 708 is fixedly connected to one side of the adjusting slider 709.

[0034] Reference Figures 1-6 , the two mounting plates 715 are fixedly connected with tooling blocks 710 at equal distances on the inner side facing the tooling cylinder 706, and multiple tooling blocks 710 are movably connected to one side of the adjusting slider 709 with a rotating shaft 712, and the outside of multiple rotating shafts 712 are fixedly connected with an adjusting rod 711, and one side of the two tooling support plates 701 is fixedly connected to two electric telescopic rods 704, and the driving ends of the multiple electric telescopic rods 704 are fixedly connected to a connecting plate 705, and one side of the connecting plate 705 is fixedly connected to one side of the guide cylinder 702.

[0035] Reference Figures 1-6 , a circular hole is opened on both sides of the multiple adjusting rods 711, and the interiors of the two opposite circular holes are connected to the rotating shaft 713 through bearings, and the outsides of the two rotating shafts 713 on the same side are movably connected to the same adjusting plate 714, and the outsides of the multiple adjusting plates 714 are provided with the same working steel pipe 9, and the outside of the working steel pipe 9 is penetrated by the outer protective tube 8. The working steel pipe 9 and the outer protective tube 8 are located inside the arc space of the hollow lower mold 1 and the hollow upper mold 2. An injection hole is opened on one side of the outside of the outer protective tube 8, and one end of the high-pressure injection tube 4 is located inside the injection hole.

[0036] Reference Figures 1-6The inner side of the hollow lower mold 1 and the hollow upper mold 2 is provided with perforations at equal distances, and the inner sides of the multiple perforations are slidably connected with lifting cylinders 719, and the multiple lifting cylinders 719 are fixedly connected with arc-shaped limiting plates 723 on the side facing the arc space, and the arc surfaces of the multiple arc-shaped limiting plates 723 are fixedly connected with telescopic springs 724 at equal distances, and one side of the multiple telescopic springs 724 located on the same arc-shaped limiting plate 723 is fixedly connected with the same arc-shaped impact plate 725, and the arc surface of the arc-shaped impact plate 725 is against the outside of the outer protective tube 8.

[0037] Reference Figures 1-6 , one side of the multiple lifting cylinders 719 is fixedly connected to a U-shaped mounting frame 2 721, and both sides of the multiple U-shaped mounting frames 2 721 are provided with round holes 2, and the interiors of the two opposite round holes 2 are connected to the same roller 722 through bearings, and one side of the multiple U-shaped mounting frames 2 721 is fixedly connected to a return spring 720, and one side of the multiple return springs 720 located on the upper side is fixedly connected to the inner side of the hollow upper mold 2, and one side of the multiple return springs 720 located on the lower side is fixedly connected to the inner side of the hollow lower mold 1.

[0038] Reference Figures 1-6 A U-shaped mounting frame 716 is fixedly connected to one side of the inner portion of the hollow lower mold 1 and the hollow upper mold 2 at equal distances. Circular holes 3 are provided on both sides of the multiple U-shaped mounting frames 716. Cams 717 are connected to the interior of the two opposite circular holes 3 through bearings. The protruding portion of the cam 717 is against the outer portion of the roller 722.

[0039] Reference Figures 1-6 One end of each of the multiple cams 717 is fixedly connected to a pulley, and the outside of each of the multiple pulleys at the same level is connected to the same belt 726 for transmission. A driving motor 718 is fixedly connected to the inner side of the hollow lower mold 1 and the hollow upper mold 2, and the driving end of the driving motor 718 is connected to one side of the cam 717 through a coupling.

[0040] In a specific application scenario, the working steel pipe 9 with the outer protective tube 8 is first placed in the arc space on the hollow lower mold 1. At this time, the outer protective tube 8 is positioned by multiple arc-shaped impact plates 725 on the hollow lower mold 1, and then the electric telescopic rod 704 is started. The electric telescopic rod 704 on both sides drives the horizontal moving frame 703 on the guide cylinder 702 to move horizontally, so that the tooling cylinder 706 moves to the inside of the working steel pipe 9, and then the electric hydraulic cylinder 708 is started. The electric hydraulic cylinder 708 drives the adjusting slider 709 to slide outside the limiting circular rod 707, so that the adjusting rod 711 is opened to the outside of the tooling cylinder 706. At this time, the adjusting plate 714 on the adjusting rod 711 is against the inside of the working steel pipe 9, thereby positioning the working steel pipe 9, so that the working steel pipe 9 and the outer protective tube 8 are synchronized. Axis, and then buckle the hollow upper mold 2 on top of the hollow lower mold 1, inject polyurethane foam into the injection hole on the outer protective tube 8 through the high-pressure injection tube 4, and start the drive motor 718 at the same time. The drive motor 718 drives the belt 726 to rotate multiple cams 717, and the cam 717 drives the roller 722 to make the lifting cylinder 719 intermittently lift, so that the arc impact plate 725 on the arc limit plate 723 intermittently impacts the outer protective tube 8, so that the polyurethane foam vibrates and flows in the gap between the working steel pipe 9 and the outer protective tube 8, thereby reducing the generation of pores when the polyurethane foam flows. Through the foaming module 7, it is ensured that the steel pipe is at the center line position of the outer protective layer when the polyurethane foam is filled, which is beneficial to the flow of polyurethane foam in the gap, so that the polyurethane foam is filled evenly, and the thermal insulation performance of the insulation pipe is improved.

[0041] Reference Figure 4 , one side of the two horizontal moving frames 703 is provided with a limiting circular opening, and the interior of the multiple limiting circular openings are slidably connected to the limiting cylinder 10, one end of the two limiting cylinders 10 located on the same side is fixedly connected to the same blocking plate 12, and one side of the two blocking plates 12 is fixedly connected to two extrusion springs 11, one side of the extrusion spring 11 is fixedly connected to one side of the horizontal moving frame 703, and the extrusion spring 11 surrounds the outside of the limiting cylinder 10.

[0042] In a specific application scenario, when the horizontal moving frame 703 moves, the extrusion spring 11 uses its own elasticity to enable the sealing plate 12 to seal the opening between the working steel pipe 9 and the outer protective pipe 8, thereby preventing leakage of polyurethane foam during filling.

[0043] Reference Figure 1 and Figure 3 Ventilation holes 6 are opened at equal distances on the inner side of the arc space of the hollow lower mold 1 and the hollow upper mold 2, and air inlet holes are opened on one side of the hollow lower mold 1 and the hollow upper mold 2, and the inside of the two air inlet holes are fixedly connected to the temperature delivery pipe 5.

[0044] Working principle: First, place the working steel pipe 9 with the outer protective tube 8 in the arc space on the hollow lower mold 1. At this time, the outer protective tube 8 is positioned by multiple arc-shaped impact plates 725 on the hollow lower mold 1, and then start the electric telescopic rod 704. The electric telescopic rod 704 on both sides drives the horizontal moving frame 703 on the guide cylinder 702 to move horizontally, so that the tooling cylinder 706 moves to the inside of the working steel pipe 9, and then start the electric hydraulic cylinder 708. The electric hydraulic cylinder 708 drives the adjusting slider 709 to slide outside the limiting circular rod 707, so that the adjusting rod 711 opens to the outside of the tooling cylinder 706. At this time, the adjusting plate 714 on the adjusting rod 711 is against the inside of the working steel pipe 9, thereby positioning the working steel pipe 9, so that the working steel pipe 9 is coaxial with the outer protective tube 8. Then, the hollow upper mold 2 is buckled on top of the hollow lower mold 1, and polyurethane foam is injected into the injection hole on the outer protective tube 8 through the high-pressure injection tube 4. At the same time of injection, the drive motor 718 is started, and the belt 726 is driven by the drive motor 718 to rotate multiple cams 717. The roller 722 is driven by the cam 717 to intermittently lift the lifting cylinder 719, so that the arc impact plate 725 on the arc limit plate 723 intermittently impacts the outer protective tube 8, so that the polyurethane foam vibrates and flows in the gap between the working steel pipe 9 and the outer protective tube 8, thereby reducing the generation of air holes when the polyurethane foam flows. When the horizontal moving frame 703 moves, the extrusion spring 11 uses its own elasticity to make the sealing plate 12 seal the opening between the working steel pipe 9 and the outer protective tube 8 to avoid leakage of polyurethane foam during filling.

[0045] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A prefabricated direct-buried insulation pipe foaming mold without a support, characterized in that: It includes a hollow lower mold (1); A hollow upper mold (2), wherein the hollow upper mold (2) is connected to one side of the hollow lower mold (1) via a hinge, and a tool handle (3) is fixedly connected to one side of the hollow upper mold (2); A high-pressure injection tube (4), wherein the high-pressure injection tube (4) is installed on the hollow upper mold (2), and arc spaces are provided inside the hollow upper mold (2) and the hollow lower mold (1); A foaming module (7) is provided on a hollow lower mold (1) and a hollow upper mold (2), and the foaming module (7) includes two tooling support plates (701). Two guide holes are provided on one side of the two tooling support plates (701). The interiors of the multiple guide holes are slidably connected to guide cylinders (702), and one end of the two guide cylinders (702) located on the same side is fixedly connected to the same horizontal movable frame (703). One side of the two horizontal movable frames (703) is provided with a mounting circular opening, and the interiors of the two mounting circular openings are fixedly connected to tooling cylinders (706). The foaming module (7) ensures that the steel pipe is at the center line position of the outer sheath when the polyurethane foam is filled, which is beneficial for the polyurethane foam to flow in the gap, so that the polyurethane foam is filled evenly, thereby improving the thermal insulation performance of the insulation pipe.

2. The foaming mold for prefabricated direct-buried thermal insulation pipe without a support according to claim 1, characterized in that: One side of the two tooling cylinders (706) is fixedly connected to a mounting plate (715), and the two mounting plates (715) are fixedly connected to a limiting round rod (707) at equal distances on the inner side of the tooling cylinder (706), one side of the limiting round rod (707) is fixedly connected to the inner side of the tooling cylinder (706), and the outer sides of multiple limiting round rods (707) located on the same side are slidably connected to the same adjusting slider (709), and the inner side of the two tooling cylinders (706) is fixedly connected to an electric hydraulic cylinder (708), and the driving end of the electric hydraulic cylinder (708) is fixedly connected to one side of the adjusting slider (709).

3. The foaming mold for prefabricated direct-buried thermal insulation pipe without a support according to claim 2, characterized in that: The two mounting plates (715) are fixedly connected to tooling blocks (710) at equal distances on the inner side facing the tooling cylinder (706), and a plurality of tooling blocks (710) are movably connected to a rotating shaft (712) on one side of the adjusting slider (709), and an adjusting rod (711) is fixedly connected to the outside of the plurality of rotating shafts (712). Two electric telescopic rods (704) are fixedly connected to one side of the two tooling support plates (701), and the driving ends of the plurality of electric telescopic rods (704) are fixedly connected to a connecting plate (705), and one side of the connecting plate (705) is fixedly connected to one side of the guide cylinder (702).

4. The foaming mold for prefabricated direct-buried thermal insulation pipe without a support according to claim 3, characterized in that: A circular hole is provided on both sides of the plurality of adjusting rods (711), and the interiors of the two opposite circular holes are connected to a rotating shaft (713) through a bearing, and the exteriors of the two rotating shafts (713) located on the same side are movably connected to the same adjusting plate (714), and the exteriors of the plurality of adjusting plates (714) are provided with the same working steel pipe (9), and an outer protective pipe (8) is inserted into the exterior of the working steel pipe (9), and the working steel pipe (9) and the outer protective pipe (8) are located inside the circular arc space between the hollow lower mold (1) and the hollow upper mold (2), and an injection hole is provided on one side of the exterior of the outer protective pipe (8), and one end of the high-pressure injection pipe (4) is located inside the injection hole.

5. The foaming mold for prefabricated direct-buried thermal insulation pipe without a support according to claim 4, characterized in that: The inner side of the hollow lower mold (1) and the hollow upper mold (2) is provided with perforations at equal distances, and the inner sides of the plurality of perforations are all slidably connected to a lifting cylinder (719), and the sides of the plurality of lifting cylinders (719) facing the arc space are all fixedly connected to an arc-shaped limiting plate (723), and the arc-shaped surfaces of the plurality of arc-shaped limiting plates (723) are fixedly connected to telescopic springs (724) at equal distances, and one side of the plurality of telescopic springs (724) located on the same arc-shaped limiting plate (723) is all fixedly connected to the same arc-shaped impact plate (725), and the arc-shaped surface of the arc-shaped impact plate (725) abuts against the outside of the outer protective tube (8).

6. The foaming mold for prefabricated direct-buried thermal insulation pipe without a support according to claim 5, characterized in that: One side of the plurality of lifting cylinders (719) is fixedly connected to a U-shaped mounting frame (721), and two circular holes are provided on both sides of the plurality of U-shaped mounting frames (721), and the interiors of the two opposite circular holes are connected to the same roller (722) through bearings, and one side of the plurality of U-shaped mounting frames (721) is fixedly connected to a return spring (720), and one side of the plurality of return springs (720) located on the upper side is fixedly connected to the inner side of the hollow upper mold (2), and one side of the plurality of return springs (720) located on the lower side is fixedly connected to the inner side of the hollow lower mold (1).

7. The foaming mold for prefabricated direct-buried thermal insulation pipe without a support according to claim 6, characterized in that: A U-shaped mounting frame (716) is fixedly connected to one side of the inner portion of the hollow lower mold (1) and the hollow upper mold (2) at equal distances. Circular holes (3) are provided on both sides of the plurality of U-shaped mounting frames (716). Cams (717) are connected to the inside of two opposing circular holes (3) via bearings. The protruding portion of the cam (717) abuts against the outside of the roller (722).

8. The foaming mold for prefabricated direct-buried thermal insulation pipe without a support according to claim 7, characterized in that: One end of each of the plurality of cams (717) is fixedly connected to a pulley, and the outsides of the plurality of pulleys located at the same level are all transmission-connected to the same belt (726); a driving motor (718) is fixedly connected to one side of the interior of the hollow lower mold (1) and the hollow upper mold (2); and a driving end of the driving motor (718) is connected to one side of the cam (717) via a coupling.

9. The foaming mold for prefabricated direct-buried thermal insulation pipe without a support according to claim 8, characterized in that: A limiting circular opening is provided on one side of the two horizontally movable frames (703), and the interiors of the plurality of limiting circular openings are slidably connected to a limiting cylinder (10), one end of the two limiting cylinders (10) located on the same side is fixedly connected to the same blocking plate (12), one side of the two blocking plates (12) is fixedly connected to two extrusion springs (11), one side of the extrusion spring (11) is fixedly connected to one side of the horizontally movable frame (703), and the extrusion spring (11) surrounds the outside of the limiting cylinder (10).

10. The foaming mold for prefabricated direct-buried thermal insulation pipe without a support according to claim 9, characterized in that: Ventilation holes (6) are provided at equal distances on the inner sides of the arc spaces of the hollow lower mold (1) and the hollow upper mold (2), and air inlet holes are provided on one side of the hollow lower mold (1) and the hollow upper mold (2), and temperature delivery pipes (5) are fixedly connected to the interiors of the two air inlet holes.

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