A heating construction pipeline jacking device

Abstract

This invention relates to the field of pipeline jacking technology, and particularly to a pipeline jacking device for heating construction. The device includes a jacking cutterhead, a launching shaft at one end of the cutterhead, a propulsion cylinder inside the launching shaft, and a circular push plate fixedly connected to the output port of the propulsion cylinder. A heating pipeline is positioned on the side of the circular push plate facing the cutterhead, and a support mechanism is provided at the end of the circular push plate facing the heating pipeline. This mechanism counteracts the radial compression load of the soil on the outer wall of the pipeline, effectively preventing problems such as excessive local deformation, weld cracking, or interface leakage caused by external pressure. It provides core protection for the structural integrity of the heating pipeline. The synergistic effect of the cross-shaped frame, the movable push plate, and the rubber abutment in the support mechanism accurately distributes the force on the inner wall of the pipeline to four support points, preventing damage caused by local stress concentration and further reducing the risk of pipeline deformation and weld cracking. This lays the foundation for the long-term stable operation of the heating pipeline.

Description

Technical Field

[0001] This invention relates to the field of pipeline jacking technology, and in particular to a pipeline jacking device for heating construction. Background Technology

[0002] The pipeline jacking device for heating construction is the core equipment for trenchless construction of heating pipelines. It is used to lay pipelines without damaging the ground. Its core function is to provide continuous and stable thrust through a hydraulic system to jack the heating pipeline from the starting well into the ground until the receiving well is completed. With the help of equipment such as laser guides and total stations, the jacking direction of the pipeline is controlled to ensure that it is laid along the designed slope and route and to avoid deviation. Some devices are equipped with a pipe jacking head at the front end, which can break up loose soil or rocks. At the same time, soil and debris are discharged with the help of a screw conveyor and mud pump to ensure smooth jacking. The pipeline support device also fixes the position of the pipeline to prevent deformation or deviation during jacking. It is suitable for urban main roads, old residential areas, and railway crossings where excavation is inconvenient. During construction, it is necessary to monitor the jacking pressure and conduct underground soil surveys in advance to select a suitable jacking head.

[0003] Currently, existing pipeline jacking devices (such as CN115306415B) disclose a small-diameter pipeline jacking device and construction method, applied in the field of pipeline construction. It includes an excavator head and a hydraulic propulsion unit, with the hydraulic propulsion unit driving the excavator head forward within the soil layer. It also includes a fixed cylinder and a sliding cylinder, both of which are fitted onto the excavator head. The sliding cylinder is fixedly connected to the excavator head, while the fixed cylinder is slidably disposed on the excavator head, positioned on the side of the sliding cylinder facing the hydraulic propulsion unit. The sliding cylinder and the fixed cylinder are connected by a drive mechanism, which drives the sliding cylinder to move away from the hydraulic propulsion unit. A rock-breaking mechanism is provided on the side of the sliding cylinder facing away from the fixed cylinder. This application can improve the excavator head's ability to break rocks and advance through soil layers.

[0004] However, during the implementation of the above technical solution, at least the following technical problems were discovered:

[0005] Due to the lack of an effective pressure relief mechanism, pipeline jacking devices are prone to localized excessive deformation during underground pipeline laying, especially in areas with high soil density or complex geological conditions. The compressive force on the outer wall of the pipeline exceeds the structural tolerance limit, which can lead to problems such as weld cracking and joint leakage, seriously damaging the structural integrity of the heating pipeline, and even causing construction interruption or subsequent heating failure. Summary of the Invention

[0006] Technical problem to be solved: Due to the lack of an effective pressure relief mechanism, the pipeline jacking device is prone to local excessive deformation during the underground laying process. Especially in areas with high soil density or complex geological conditions, the compressive force on the outer wall of the pipeline exceeds the structural tolerance limit, which leads to problems such as weld cracking and joint leakage, seriously damaging the structural integrity of the heating pipeline, and even causing construction interruption or subsequent heating failure.

[0007] To address the shortcomings of existing technologies, this invention provides a heating construction pipeline jacking device, thereby solving the technical problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A heating construction pipeline jacking device includes a pipe jacking cutterhead, a starting well is provided at one end of the pipe jacking cutterhead, a propulsion cylinder is provided inside the starting well, a disc push plate is fixedly connected to the output port of the propulsion cylinder, and a heating pipeline is provided on the side of the disc push plate facing the pipe jacking cutterhead.

[0010] The end of the disc pusher facing the heating pipe is equipped with a support mechanism, which includes four movable pushers and four rubber abutments.

[0011] In one possible implementation, a cross-shaped frame is movably connected to the side of the disc pusher facing the heating pipe, and four rubber abutments are located at the four ends of the cross-shaped frame. The side of each rubber abutment facing the cross-shaped frame is fixedly connected to the movable pusher.

[0012] In one possible implementation, a rotating bevel gear is positioned at the center point inside the cross-shaped frame. Four meshing bevel gears are vertically engaged at the side end of the rotating bevel gear. A rotating shaft is fitted at the center point of the rotating bevel gear. The surface of the rotating shaft is fixedly connected to the rotating bevel gear, and both sides of the rotating shaft are rotatably connected to the inner wall of the cross-shaped frame.

[0013] In one possible implementation, the interior of the cross-shaped frame is provided with four threaded rods, all located at the four ends of the cross-shaped frame. Each threaded rod is rotatably connected to a support fixing plate on both sides, and the side surface of each support fixing plate is fixedly connected to the inner wall of the cross-shaped frame.

[0014] In one possible implementation, a rotating connecting post is fitted at the center point of each of the four support fixing plates near the rotating shaft. One end of each rotating connecting post is fixedly connected to the corresponding threaded rod, and the other end of each rotating connecting post is fixedly connected to the corresponding meshing bevel gear.

[0015] In one possible implementation, a movable block is threaded onto one end of each threaded rod, and the surface of each movable block abuts against the inner wall of the cross-shaped frame. Two parallel connecting plates are fixedly connected to the side of each of the four movable blocks facing away from the rotation axis. Each connecting plate passes through the support fixing plate and is fixedly connected to the corresponding movable push plate.

[0016] In one possible implementation, a rotating column is rotatably connected to the center point of the disc pusher, a U-shaped support plate is fixedly connected to the side of the disc pusher away from the cross-shaped frame, a servo motor is fixedly connected to the side of the U-shaped support plate away from the disc pusher, and the output port of the servo motor passes through the U-shaped support plate and is fixedly connected to the rotating column.

[0017] In one possible implementation, a cross-shaped locking block is fixedly connected to one end of the rotating cylinder facing the cross-shaped frame, and a cross-shaped groove is opened through the side surface of the rotating shaft, through which the rotating shaft engages with the cross-shaped locking block.

[0018] In one possible implementation, four limiting blocks are fixedly connected to the side of the disc pusher facing the heating pipe. The four limiting blocks are located at the four corners of the cross-shaped frame, and the cross-shaped frame is embedded in the four limiting blocks.

[0019] In one possible implementation, the two limit blocks on the right are hinged to hinged long plates, the ends of the two hinged long plates correspond to the two limit blocks on the left, and one end of the two hinged long plates is fixedly connected to a magnetic suction plate, the two magnetic suction plates correspond to the positions of the two limit blocks on the left.

[0020] Beneficial effects compared to existing technologies:

[0021] 1. In this solution, the support mechanism is tightly fitted to the inner wall of the pipe with four rubber abutments. The "internal reaction force" counteracts the radial compression load of the soil on the outer wall of the pipe, effectively preventing problems such as excessive local deformation, weld cracking, or interface leakage caused by external pressure. This provides core protection for the structural integrity of the heating pipe. The synergistic effect of the cross-shaped frame, the movable push plate, and the rubber abutments in the support mechanism can accurately distribute the force on the inner wall of the pipe to four support points, preventing damage to the pipe caused by local stress concentration, further reducing the risk of pipe deformation and weld cracking, and laying the foundation for the long-term stable operation of the heating pipe.

[0022] 2. In this solution, the support mechanism has flexible adjustment capabilities. By controlling the number of rotations of the rotating shaft, it can drive the rotating bevel gear, meshing bevel gear, and threaded rod to move the four moving blocks and the rubber abutment plate to different distances simultaneously. This allows it to adapt to heating pipes with different inner diameters. This adaptability design eliminates the need to customize support components for pipes of different specifications, reducing equipment investment costs. At the same time, it ensures the uniform distribution of support force during the construction of different pipes, avoids local overload, and improves the versatility and practicality of the device.

[0023] 3. In this solution, the four metal limiting blocks on the disc push plate can embed the cross-shaped frame into it, achieving initial stable contact between the support mechanism and the disc push plate. The hinged long plate of the right limiting block, together with the magnetic suction plate, can quickly attract the left limiting block to fix the cross-shaped frame a second time, effectively reducing the problem of loosening and displacement of the cross-shaped frame caused by vibration during support operation, and providing a reliable foundation for the precise force application of the support mechanism. Attached Figure Description

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the cross-shaped frame of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the rubber bearing plate of the present invention;

[0028] Figure 4 This is a schematic diagram of the U-shaped support plate of the present invention;

[0029] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A;

[0030] Figure 6 This is a schematic diagram of the structure of the magnetic accumulator plate of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the connecting long plate of the present invention;

[0032] Figure 8 This is a schematic diagram of the threaded rod of the present invention;

[0033] Figure 9 This is a schematic diagram of the meshing bevel gear of the present invention.

[0034] Legend: 11. Pipe jacking cutterhead; 12. Heating pipe; 13. Starting shaft; 14. Disc pusher plate; 15. Propulsion cylinder; 16. Cross-shaped frame; 17. Moving pusher plate; 18. Hinge plate; 19. Rubber stop plate; 20. Connecting plate; 21. Limiting block; 22. U-shaped support plate; 23. Servo motor; 24. Cross-shaped locking block; 25. Rotating column; 26. Magnetic suction plate; 27. Threaded rod; 28. Moving block; 29. ​​Rotating bevel gear; 30. Meshing bevel gear; 31. Support fixing plate; 32. Cross-shaped groove; 33. Rotating shaft; 34. Rotating connecting column. Detailed Implementation

[0035] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can also be implemented in various different forms, and therefore the present invention is not limited to the embodiments described below. In addition, for the purpose of more clearly describing the present invention, parts not connected to the invention will be omitted from the drawings.

[0036] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0037] Example:

[0038] Please refer to Figure 1 and Figure 9 As shown in the figure, this embodiment introduces the specific structure of a jacking device for heating construction pipelines, including a jacking cutterhead 11. The jacking cutterhead 11 is driven by a large gear system or hydraulic power system. Its main function is to break up the surrounding rock and soil into transportable fine particles to facilitate subsequent slag removal operations. After breaking up, the jacking device will cast a cement pipe sleeve. The sleeve is jacked along a preset axis, and at the same time, quick-setting grout is injected into the gap between the sleeve and the stratum. The grout quickly fills the pores and solidifies, fixing the position of the sleeve and preventing jacking deviation. The casing is moved to form a rigid support structure to resist ground pressure and prevent collapse. On the other hand, it isolates groundwater, silt and other impurities, protecting the subsequently installed working pipelines from corrosion or external damage. After the casing is pushed in, the heating pipe 12 is pushed in. One end of the jacking cutterhead 11 is equipped with a starting well 13, which is the "starting point" of the jacking operation. The starting well 13 is equipped with a propulsion cylinder 15. The output port of the propulsion cylinder 15 is oriented in the same direction as the jacking cutterhead 11, and the output port of the propulsion cylinder 15 is fixedly connected. A disc pusher plate 14 is provided, with a heating pipe 12 installed on the side of the disc pusher plate 14 facing the jacking cutterhead 11. Through the cooperation of the disc pusher plate 14 and the propulsion cylinder 15, the propulsion cylinder 15 pushes the disc pusher plate 14 with axial thrust generated by hydraulic drive. The propulsion cylinder 15 will gradually "push" the heating pipe 12 from the starting shaft 13 to the pre-set underground laying path. The heating pipe 12 is mostly prefabricated in sections and cannot be jacked in one go. The propulsion cylinder 15 needs to cooperate with "section-by-section docking and jacking". The construction process is as follows: when the first section of heating pipe 12 is pushed underground to a certain distance of one pipe section length, the piston rod of the propulsion cylinder 15 will retract, freeing up space in the launching shaft 13. The construction workers will then hoist the next section of heating pipe 12 into the launching shaft 13 and seal it with the end of the heating pipe 12 that has already been pushed underground. After the connection is completed, the propulsion cylinder 15 will extend again and push the two pipe sections forward as a whole. The cycle of "retraction-connection-push" will be repeated until all pipe sections are pushed into the underground pre-set path.

[0039] When the heating pipe 12 enters the predetermined underground path, the soil around the heating pipe 12 may transfer pressure to the outer wall of the heating pipe 12 through interparticle compression, forming "radial pressure". To reduce the radial pressure experienced by the heating pipe 12 when entering the predetermined path, a support mechanism is provided at the end of the disc pusher plate 14 facing the heating pipe 12. The support mechanism includes four movable push plates 17 and four rubber abutments 19. The support mechanism can offset the external compression load through "internal reaction force". The support mechanism fits tightly against the inner wall of the pipe to avoid excessive local deformation of the pipe and even prevent cracking of pipe welds and leakage at joints caused by compression. The disc pusher plate 14 A cross-shaped frame 16 is movably connected to the side facing the heating pipe 12. Four rubber abutments 19 are located at the four ends of the cross-shaped frame 16. The side of each rubber abutment 19 facing the cross-shaped frame 16 is fixedly connected to a movable push plate 17. When the rubber abutment 19 abuts against the inner wall of the heating pipe 12, the movable push plate 17 will cooperate with the cross-shaped frame 16 to form a stable support structure, which can accurately distribute the force on the inner wall of the heating pipe 12 and avoid local stress concentration. This not only further reduces the risk of deformation and weld cracking of the heating pipe 12, but also reduces the later maintenance cost, ensures the long-term stable operation of the heating pipe 12, and provides a reliable pipe foundation for winter heating.

[0040] Heating pipes 12 are mostly made of metal or plastic, with high surface hardness but weak local impact resistance. When the rubber abutment 19 is in contact with the inner wall of the pipe, it can buffer the pressure transmitted by the support mechanism through its own elasticity, avoiding physical damage such as scratches and indentations on the inner wall of the pipe caused by direct contact between metal or hard materials. At the same time, during the jacking operation, the impact force generated by soil compression and equipment vibration will be absorbed by the rubber, reducing the impact of vibration on weak parts such as pipe welds and joints, and further ensuring the integrity of the pipe structure.

[0041] To ensure stable support of the inner wall of the heating pipe 12 by the support mechanism, a rotating bevel gear 29 is positioned at the center point of the cross-shaped frame 16. Four meshing bevel gears 30 are vertically engaged at the side ends of the rotating bevel gear 29, each corresponding to one of the four sides of the cross-shaped frame 16. A rotating shaft 33 is fitted onto the center point of the rotating bevel gear 29, and its surface is fixedly connected to the rotating bevel gear 29. Both sides of the rotating shaft 33 are rotatably connected to the inner wall of the cross-shaped frame 16. The rotation of the rotating shaft 33 is controlled to... The rotating bevel gear 29 is driven to rotate, which in turn drives the four meshing bevel gears 30 to rotate. Four threaded rods 27 are installed inside the cross-shaped frame 16, located at the four ends of the frame. Each threaded rod 27 has a support plate 31 rotatably connected to both sides. The side surface of each support plate 31 is fixedly connected to the inner wall of the cross-shaped frame 16. The support plate 31 provides a stable support environment for the threaded rods 27, allowing all four threaded rods 27 to rotate within the cross-shaped frame 16. The internal rotation is achieved by rotating the gear. At the center point of each of the four support plates 31 near the rotating shaft 33, a rotating connecting post 34 for transmission is fitted. One end of each rotating connecting post 34 is fixedly connected to a corresponding threaded rod 27, and the other end is fixedly connected to a corresponding meshing bevel gear 30. When the meshing bevel gear 30 rotates, it drives the threaded rod 27 to rotate via the rotating connecting post 34. One end of each threaded rod 27 is threaded with a moving block 28, and the surface of each moving block 28 abuts against the inner wall of the cross-shaped frame 16. When the screw... When the rib 27 moves, the four moving blocks 28 will move away from each other. The side of the four moving blocks 28 facing away from the rotation axis 33 is fixedly connected to two parallel connecting plates 20. Each connecting plate 20 passes through the support fixing plate 31 and is fixedly connected to the corresponding moving push plate 17. When the moving block 28 moves, it will drive the corresponding moving push plate 17 and the rubber abutment 19 away from each other through the connecting plate 20, so that the rubber abutment 19 can gradually abut against the inner wall of the heating pipe 12, and further enable the support mechanism to stably abut against the inner wall of the heating pipe 12.

[0042] By controlling the number of rotations of the rotating shaft 33, the four rubber abutments 19 can move to different distances simultaneously, so that the support mechanism can be adapted to heating pipes 12 with different inner diameters, and the support force is evenly distributed to avoid local overload. At the same time, the components work together to ensure the stability of the support, effectively resist the radial pressure of the soil, further reduce the risk of pipe deformation and weld cracking, and build a solid defense for the long-term safe operation of the heating pipe 12.

[0043] After the support mechanism completes its support of the inner wall of the heating pipe 12, and after the disc pusher plate 14 pushes the heating pipe 12, in order to ensure that the support mechanism can continue to support the inner wall of the pipe, a rotating column 25 is rotatably connected at the center point of the disc pusher plate 14. A U-shaped support plate 22 for supporting the servo motor 23 is fixedly connected to the side of the disc pusher plate 14 facing away from the cross-shaped frame 16. The servo motor 23 is fixedly connected to the side of the U-shaped support plate 22 facing away from the disc pusher plate 14. The output port of the servo motor 23 passes through the U-shaped support plate 22 and is fixedly connected to the rotating column 25. A cross-shaped locking block 24 for driving the rotating shaft 33 to rotate is fixedly connected to the end of the rotating column 25 facing the cross-shaped frame 16. A cross-shaped groove 32 adapted to the cross-shaped locking block 24 is opened through the side surface of the rotating shaft 33. The rotating shaft 33 is engaged with the cross-shaped locking block 24 through the cross-shaped groove 32. When the servo motor 23 is started, it drives the rotating column 25 and the cross-shaped locking block 24 to rotate. The cross-shaped locking block 24 drives the rotating shaft 33 to rotate, so that the support mechanism can support the inner wall of the heating pipe 12. After the push is completed, the push cylinder 15 controls the disc push plate 14 to retract. When the disc push plate 14 retracts, it will bring out the rotating column 25 and the cross-shaped locking block 24, so that the cross-shaped locking block 24 will disengage from the inside of the rotating shaft 33. When the disc push plate 14 drives the cross-shaped locking block 24 to disengage, the support mechanism will not move with the movement of the disc push plate 14. At this time, the support mechanism can stably support the inner wall of the heating pipe 12. This separate design allows the disc push plate 14 to smoothly carry out subsequent jacking operations, while the support mechanism can remain in place to continuously resist the radial pressure of the soil, preventing the heating pipe 12 from deforming due to loss of support during the push gap.

[0044] To ensure that the support mechanism can stably fit with the disc push plate 14, four limiting blocks 21 are fixedly connected to the side of the disc push plate 14 facing the heating pipe 12. The four limiting blocks 21 are located at the four corners of the cross-shaped frame 16. The cross-shaped frame 16 is embedded in the four limiting blocks 21. This design ensures that the support mechanism and the disc push plate 14 always maintain a stable fit through the limiting effect of the limiting blocks 21 on the cross-shaped frame 16, providing a reliable foundation for the support mechanism to accurately exert force.

[0045] The limiting blocks 21 are made of metal. The two limiting blocks 21 on the right side are hinged with hinged long plates 18. The ends of the two hinged long plates 18 correspond to the two limiting blocks 21 on the left. One end of the two hinged long plates 18 is fixedly connected with a magnetic suction plate 26. The two magnetic suction plates 26 correspond to the positions of the two limiting blocks 21 on the left. When the cross-shaped frame 16 is embedded in the four limiting blocks 21, the two hinged long plates 18 are flipped to attract the two magnetic suction plates 26 to the two limiting blocks 21 on the left. This allows the cross-shaped frame 16 to be held more stably within the four limiting blocks 21. Through the attraction and cooperation between the magnetic suction plates 26 and the metal limiting blocks 21, the cross-shaped frame 16 can be quickly fixed again. This further enhances the connection stability between the support mechanism and the disc push plate 14 and reduces the problem of the cross-shaped frame 16 loosening and shifting due to vibration during support operations.

[0046] The magnetic plate 26 can quickly form an adsorption and fixation with the metal limiting block 21 without the need for complex fasteners. It can stably restrict the cross-shaped frame 16 within the limiting block 21 of the disc push plate 14, avoiding loosening and displacement of the support mechanism due to vibration during the initial push of the servo motor 23 and the push cylinder 15. When the disc push plate 14 completes the push and moves backward with the push cylinder 15, the pulling force of the disc push plate 14 will cause the magnetic plate 26 to be disengaged from the limiting block 21, and the adsorption state will be automatically canceled. This will not cause excessive pulling on the support mechanism left in the heating pipe 12, ensuring that the support mechanism can continuously and stably press against the inner wall of the pipe, ensuring that subsequent support operations are not affected, and taking into account both the reliability of installation and fixation and the convenience of disassembly and separation.

[0047] Working principle:

[0048] The support mechanism is embedded in the four limiting blocks 21, so that the cross-shaped locking block 24 is inserted into the cross-shaped groove 32. The servo motor 23 is started. The output end of the servo motor 23 drives the rotating column 25 and the cross-shaped locking block 24 at the end to rotate. The cross-shaped locking block 24 drives the rotating shaft 33 to rotate, which in turn drives the rotating bevel gear 29 to rotate. The rotation of the rotating bevel gear 29 will synchronously drive the four meshing bevel gears 30 to rotate. When the meshing bevel gears 30 rotate, they drive the threaded rod 27 to rotate synchronously through the rotating connecting column 34. When the threaded rod 27 rotates, the four moving blocks 28 move along the cross-shaped groove 32. The frames 16 are radially separated from each other. The moving block 28 is fixedly connected to the moving push plate 17 via the connecting long plate 20, thereby driving the rubber abutment 19 at the end of the moving push plate 17 to move away synchronously until the rubber abutment 19 is tightly attached to the inner wall of the heating pipe 12. By controlling the number of rotations of the rotating shaft 33 driven by the servo motor 23, the moving distance of the rubber abutment 19 can be precisely adjusted, so that the support mechanism can be adapted to heating pipes 12 with different inner diameters, and the support force is evenly distributed to avoid local stress concentration in the pipe, offset the radial pressure of the soil from the inside, and ensure the integrity of the pipe structure.

[0049] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A jacking device for heating construction pipelines, characterized in that, It includes a pipe jacking cutterhead (11), a starting well (13) is provided at one end of the pipe jacking cutterhead (11), a propulsion cylinder (15) is provided inside the starting well (13), a disc pusher plate (14) is fixedly connected to the output port of the propulsion cylinder (15), and a heating pipe (12) is provided between the disc pusher plate (14) and the pipe jacking cutterhead (11). The disc push plate (14) is provided with a support mechanism at one end facing the heating pipe (12). The support mechanism includes four movable push plates (17) and four rubber abutments (19). The disc push plate (14) facing the heating pipe (12) is movably connected to a cross-shaped frame (16), and four rubber abutments (19) are located at the four ends of the cross-shaped frame (16). The side of each rubber abutment (19) facing the cross-shaped frame (16) is fixedly connected to the movable push plate (17). A rotating bevel gear (29) is provided at the center point inside the cross-shaped frame (16). Four meshing bevel gears (30) are vertically meshed at the side end of the rotating bevel gear (29). A rotating shaft (33) is sleeved at the center point of the rotating bevel gear (29). The surface of the rotating shaft (33) is fixedly connected to the rotating bevel gear (29). Both sides of the rotating shaft (33) are rotatably connected to the inner wall of the cross-shaped frame (16). The cross-shaped frame (16) is provided with four threaded rods (27) inside. The four threaded rods (27) are located at the four ends of the cross-shaped frame (16). Each threaded rod (27) is rotatably connected to a support fixing plate (31) on both sides. The side surface of each support fixing plate (31) is fixedly connected to the inner wall of the cross-shaped frame (16). Rotary connecting columns (34) are fitted at the center points of the four support fixing plates (31) near the rotating shaft (33). One end of each rotary connecting column (34) is fixedly connected to the corresponding threaded rod (27), and the other end of each rotary connecting column (34) is fixedly connected to the corresponding meshing bevel gear (30). Each of the threaded rods (27) has a moving block (28) threaded onto one end. The surface of each moving block (28) abuts against the inner wall of the cross-shaped frame (16). The four moving blocks (28) are fixedly connected to two parallel connecting plates (20) on the side away from the rotation axis (33). Each connecting plate (20) passes through the support fixing plate (31) away from the rotation axis (33) and is fixedly connected to the corresponding moving push plate (17). The center point of the disc push plate (14) is rotatably connected to a rotating column (25). A U-shaped support plate (22) is fixedly connected to the side of the disc push plate (14) away from the cross-shaped frame (16). A servo motor (23) is fixedly connected to the side of the U-shaped support plate (22) away from the disc push plate (14). The output port of the servo motor (23) passes through the U-shaped support plate (22) and is fixedly connected to the rotating column (25). The rotating column (25) is fixedly connected to a cross-shaped locking block (24) at one end facing the cross-shaped frame (16). A cross-shaped groove (32) is opened through the side surface of the rotating shaft (33). The rotating shaft (33) is engaged with the cross-shaped locking block (24) through the cross-shaped groove (32). The disc push plate (14) facing the heating pipe (12) is fixedly connected with four limiting blocks (21). The four limiting blocks (21) are located at the four corners of the cross-shaped frame (16), and the cross-shaped frame (16) is embedded in the four limiting blocks (21). The two limiting blocks (21) on the right side are both hinged with hinged long plates (18). The ends of the two hinged long plates (18) correspond to the two limiting blocks (21) on the left. One end of the two hinged long plates (18) is fixedly connected with a magnetic suction plate (26). The two magnetic suction plates (26) correspond to the positions of the two limiting blocks (21) on the left. The magnetic suction plates are attracted to the limiting blocks on the left.

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