Forming device for low-melting-point alloy organic phase-change heat-conducting composite material

Abstract

The utility model provides a forming device for a low-melting-point alloy organic phase-change heat-conducting composite material, which is characterized in that a low-melting-point alloy sheet and an organic phase-change heat-conducting material sheet are stacked and wound into a cylindrical low-melting-point alloy organic phase-change heat-conducting composite material roll, and then the cylindrical low-melting-point alloy organic phase-change heat-conducting composite material roll is put into an extrusion system capable of melting and extruding; the low-melting-point alloy organic phase-change heat-conducting composite material with a certain thickness is prepared through cutting, the composite material has a heat conductivity coefficient and high heat resistance, and molten low-melting-point alloy liquid is uniformly distributed and does not overflow to cause short circuit. The low-melting-point alloy organic phase-change heat-conducting composite material is formed in the forming device at one time, the forming thickness is adjustable, and compared with a traditional process that a low-melting-point alloy sheet is firstly mounted and pasted, and then glue is coated or foam is pasted on the periphery for protection to prevent overflow, the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-melting-point alloy organic phase-change thermal conductive composite materials, in particular to a molding device of low-melting-point alloy organic phase-change thermal conductive composite materials. Background Art

[0002] As electronic products such as 5G base stations, high-speed CPUs, GPUs, and high-power charging pile chips develop towards high power, miniaturization, and high integration, the heat flow per unit area increases, and the heat must be quickly and promptly extracted, otherwise it will reduce the operating speed of electronic products, and even overheat and burn core electronic components. This places higher demands on heat dissipation interface materials, such as high thermal conductivity, low thermal resistance, and greater safety and reliability. Phase change thermal conductive materials are solid when they are below the phase change temperature, absorb heat and turn into liquid at the phase change temperature, and have a heat transfer interface thickness as thin as thermal conductive paste. Because the phase change absorbs heat, the thermal resistance is lower than that of thermal conductive paste. Low melting point alloys are also solid when they are below the phase change temperature, and they also absorb heat at the melting temperature, increasing the heat dissipation efficiency. The difference is that in addition to lattice vibration and phonon heat transfer, low melting point alloys also have electron movement to help heat transfer, so they have a higher thermal conductivity coefficient, which is more than twice that of conventional organic phase change thermal conductive materials. After low-melting-point metals are molten, their cohesive force and surface tension are large. It is difficult to apply them evenly with brushes, cotton swabs, or scrapers. After being applied, low-melting-point liquid alloys tend to aggregate into balls. When printed with a steel mesh, a large amount of liquid metal adheres to the steel mesh, causing waste. There are also cases where low-melting-point alloys are processed into sheets and then mounted. After low-melting-point alloys are melted, there is a risk of overflowing under the extrusion of thermal expansion and contraction of electronic devices, causing short circuits of electronic components. The existing process is to mount low-melting-point alloy sheets or apply glue or foam protection around the low-melting-point alloy after applying molten low-melting-point alloy sheets to prevent low-melting-point alloy liquid from overflowing, and the construction efficiency is low. Utility Model Content

[0003] In view of the shortcomings of the prior art, in order to solve the problems of uneven coating and easy overflow of low-melting-point alloys, as well as the low construction efficiency of low-melting-point alloys in the existing process, the utility model provides a molding device for low-melting-point alloy organic phase change thermal conductive composite materials. The technical solution of the utility model is as follows:

[0004] A molding device for a low-melting-point alloy organic phase-change thermal conductive composite material comprises an extrusion system, an air pipe and a compressed air controller. The extrusion system comprises an air pipe two-way joint, a sealing cover, a rubber sealing ring, an extrusion cylinder, a push plug, a compressible silicone rubber layer, a low-melting-point alloy organic phase-change thermal conductive composite material roll, a heating and melting cylinder, a heating controller, a square support block, a square shell support block, a cutter and a height adjustment rod.

[0005] The sealing cover is located at the top of the extrusion system. There is a two-way air pipe joint at the center of the top of the sealing cover. The inner wall of the sealing cover has internal threads. The extrusion cylinder is a stainless steel cylinder with a height of 50-150mm, a wall thickness of 2mm, and an inner diameter of 20-50mm. The outer wall of the upper end of the extrusion cylinder has external threads. The internal threads of the inner wall of the sealing cover and the internal threads of the outer wall of the upper end of the extrusion cylinder cooperate with each other. There is a rubber sealing ring between the top of the sealing cover and the top of the extrusion cylinder. The inner diameter of the rubber sealing ring is 2mm smaller than the inner diameter of the extrusion cylinder. The outer diameter of the rubber sealing ring is equal to the outer diameter of the extrusion cylinder. The sealing cover is tightened clockwise at the upper end of the extrusion cylinder. The rubber sealing ring is compressed to prevent compressed air from leaking into the gap between the extrusion cylinder and the sealing cover. A 0.5mm thick compressible silicone rubber layer is adhered to the inner wall of the extrusion cylinder, and its height is equal to the height of the extrusion cylinder. In addition, there is a push plug in the extrusion cylinder, located below the rubber sealing ring. The push plug is made of plastic material, and its diameter is 0.2mm smaller than the inner diameter of the extrusion cylinder. The thickness of the push plug is 10mm.

[0006] The low-melting-point alloy organic phase-change thermal conductive composite material roll is formed by stacking and winding a 0.05-0.5mm thick low-melting-point alloy sheet and an organic phase-change thermal conductive material sheet, with a layer of low-melting-point alloy sheet sandwiched between two layers of organic phase-change thermal conductive material sheets, and the outer layer is ensured to be an organic phase-change thermal conductive material sheet during winding; the organic phase-change thermal conductive material sheet is viscous within a range from room temperature to 150°C, and the molten low-melting-point alloy liquid can be adhered to the organic phase-change thermal conductive material and will not migrate; the low-melting-point alloy sheet is formed by melting and rolling a mixture of one or more metals selected from gallium, indium, tin, bismuth and zinc, and the melting point of the low-melting-point alloy is lower than 150°C; the organic phase-change thermal conductive material sheet is formed by melting a phase-change polymer material and one or more selected from alumina powder, zinc oxide powder, aluminum powder, copper powder and nickel powder. The mixture is rolled into a thin sheet of 0.05-0.5 mm; the diameter of the low-melting point alloy organic phase change thermal conductive composite material roll is smaller than the inner diameter of the extrusion cylinder, the difference between the diameter of the low-melting point alloy organic phase change thermal conductive composite material roll and the inner diameter of the extrusion cylinder is smaller than the thickness of the compressible silicone rubber layer of 0.5 mm, and the length of the low-melting point alloy organic phase change thermal conductive composite material after winding is smaller than the sum of the lengths of the extrusion cylinder and the heating and melting cylinder; the low-melting point alloy organic phase change thermal conductive composite material roll is located below the advancing piston, the difference between the diameter of the low-melting point alloy organic phase change thermal conductive composite material roll and the inner diameter of the extrusion cylinder is smaller than the thickness of the compressible silicone rubber layer of 0.5 mm, and under the extrusion effect of the compressible silicone rubber layer on the inner wall of the extrusion cylinder, the advancing plug and the low-melting point alloy organic phase change thermal conductive composite material roll will not fall under the action of gravity or a small pressure.

[0007] The heating and melting cylinder is located at the lower end of the extrusion cylinder, the inner diameter of the heating and melting cylinder is equal to the inner diameter of the extrusion cylinder, the height of the heating and melting cylinder is 50-150mm, and the outer diameter of the heating and melting cylinder is 50-80mm. A 0.5mm thick compressible silicone rubber layer is adhered to the inner wall of the heating and melting cylinder, the height of which is equal to the height of the heating and melting cylinder, the difference between the diameter of the low melting point alloy organic phase change thermal conductive composite material roll and the inner diameter of the extrusion cylinder is less than 0.5mm of the thickness of the compressible silicone rubber layer, and under the extrusion of the compressible silicone rubber layer, the plug and the low melting point alloy organic phase change thermal conductive composite material roll will not fall under the action of gravity or a small pressure.

[0008] The structure of the heating and melting cylinder is composed of a compressible silicone rubber layer, a 2mm stainless steel layer, a resistance wire heating layer, a thermal insulation cotton layer and a stainless steel outer shell layer from the inside to the outside. The inner stainless steel layer of the heating and melting cylinder is connected to the lower end of the extruded cylinder by seamless welding; the heating controller is installed on the outer side of the heating and melting cylinder, connected to the resistance wire heating layer in the heating and melting cylinder, and controls the heating temperature. The heating controller can set the control heating range: room temperature to 200°C, and the temperature control accuracy is ±2°C.

[0009] The square support block and the square shell support block are cast from epoxy molding plastic, which wrap and fix the lower 25-35% of the heating and melting cylinder from all sides, and play a supporting role for the heating and melting cylinder and the extrusion cylinder above. The heating and melting cylinder is located at the center of the square support block. The length and width of the square support block are equal and 30-40mm larger than the outer diameter of the heating and melting cylinder; the bottom of the square support block is a square shell support block, and the square support block and the square shell support block are cast as a whole block of epoxy film plastic. The top center of the square shell support block is the extrusion port at the bottom of the heating and melting cylinder. The square shell support block is 10-20mm high and the shell wall thickness is 5m m, the length and width of the square shell-shaped support block are equal, which are consistent with the length and width of the square support block; there are a pair of parallel rectangular grooves on both sides of the top of the square shell-shaped support block, the two rectangular grooves are on the same horizontal plane, parallel to the bottom outlet of the heating and melting cylinder, the rectangular groove opening faces the extrusion outlet at the bottom of the heating and melting cylinder, the vertical distance from the bottom outlet of the heating and melting cylinder to the bottom edge of the rectangular groove is 2mm, the width of the rectangular groove is 5mm, the height is 5mm, the thickness of the bottom edge of the rectangular groove is 5mm, and the length of the rectangular groove is 10mm smaller than the length of the square shell-shaped support block; the square shell-shaped support block is loaded with a cutter through the rectangular groove.

[0010] The cutter comprises a stainless steel wire, two wire fixing shafts, two springs, two stainless steel pull rods, two metal annular gaskets and an ABS plastic handle; the diameter of the stainless steel wire is 0.5 mm, and the length is greater than the outer diameter of the bottom of the heating and melting tube. The length of the stainless steel wire is 20 mm less than the length of the square shell-shaped support block. The two ends of the stainless steel wire are respectively connected to a wire fixing shaft. The wire fixing shaft is made of cylindrical stainless steel with a diameter of 4 mm and a length of 5 mm. The two ends of the stainless steel wire are connected to the axis of the wire fixing shaft. When the stainless steel wire passes horizontally through the bottom outlet of the heating and melting tube, it is tangent to the bottom of the heating and melting tube; the wire fixing shaft is loaded in the rectangular groove of the square shell-shaped support block, and the two stainless steel pull rods are each sleeved with A spring and a metal ring gasket are passed through the circular hole of the square shell support block, and the center of the circular hole is located 2mm above the bottom edge of the rectangular groove; one end of the two stainless steel pull rods is vertically connected to the steel wire fixing shaft, and the other end is respectively connected to the two ends of the ABS plastic handle outside the square shell support block, and the outer diameter of the stainless steel pull rod is less than the inner diameter of the circular hole of the bottom shell of the square support block and less than the inner diameter of the metal ring gasket; the length of the spring is the same as the length of the rectangular groove, and the outer diameter is less than the outer diameter of the metal ring gasket, and the outer diameter of the metal ring gasket is ≤5mm; the rectangular frame composed of the stainless steel wire, the steel wire fixing shaft, the stainless steel pull rod and the ABS plastic handle is parallel to the bottom of the heating and melting cylinder, and the rectangular groove and the circular hole of the bottom shell are on the same plane. The height adjustment rod is located at the four corners of the square support block and the square shell support block. The height adjustment rod is a precision screw. The distance between the bottom of the heating and melting cylinder and the surface of the radiator is adjusted by rotating the precision screw. The height adjustment rod can adjust the height range of 0-10mm.

[0011] The air pipe is connected to the compressed air controller and the air pipe two-way joint of the extrusion system; the compressed air controller contains a pressure regulating knob and a timer, which can adjust the pressure and continuous pressurization time of the compressed air.

[0012] The operation of the low melting point alloy organic phase change thermal conductive composite material molding device is as follows: use an air pipe to connect the compressed air controller and the air pipe two-way joint of the extrusion system, roll the low melting point alloy organic phase change thermal conductive composite material into the extrusion cylinder, then put the push plug and the rubber sealing ring, tighten the sealing cover clockwise, turn on the compressed air, set the pressure and pressurization time through the compressed air controller, rotate the height adjustment rod to adjust the extrusion height of the low melting point alloy organic phase change thermal conductive composite material, set the heating and melting temperature through the heating controller on the heating and melting cylinder, the heating temperature is generally 3-10℃ higher than the highest phase change temperature, start heating, and the low melting point alloy organic phase change thermal conductive composite material is The lower end of the organic phase change thermal conductive composite material is melted in the heating and melting cylinder. Driven by the compressed air pressure, the molten low melting point alloy organic phase change thermal conductive composite material is extruded from the bottom of the heating and melting cylinder. When the molten low melting point alloy organic phase change thermal conductive composite material contacts the surface of the heat dissipation substrate, the ABS plastic handle is pulled, the spring is compressed, and the stainless steel wire is pulled by the stainless steel pull rod through the steel wire fixed shaft to the extrusion port position at the bottom of the heating and melting cylinder, close to the extrusion port at the bottom of the heating and melting cylinder, and the low melting point alloy organic phase change thermal conductive composite material is cut. When the ABS plastic handle is released, the compressed spring is released and the stainless steel wire returns to its original position.

[0013] Advantages: The advantages of the utility model are that the molded low-melting-point alloy organic phase-change thermal conductive composite material has high thermal conductivity and low thermal resistance, the low-melting-point alloy liquid after melting is evenly distributed, the periphery of the low-melting-point alloy organic phase-change thermal conductive composite material is a sticky organic phase-change thermal conductive material to prevent the molten low-melting-point alloy from overflowing and causing a short circuit, and the low-melting-point alloy organic phase-change thermal conductive composite material is molded at one time in the molding device of the utility model, which improves efficiency compared with the traditional process of first installing a low-melting-point alloy sheet and then applying glue or foam around it to prevent overflow. In addition, the molding thickness of the low-melting-point alloy organic phase-change thermal conductive composite material in the utility model is adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall structure of the molding device of low melting point alloy organic phase change thermal conductive composite material

[0015] Figure 2 It is a square shell support block structure

[0016] Figure 3 It is the lower end structure of the heating and melting cylinder

[0017] Figure 4 It is a low melting point alloy organic phase change thermal conductive composite material

[0018] 1. Air pipe two-way joint; 2. Sealing cover; 3. Rubber sealing ring; 4. Push plug; 5. Extrusion cylinder; 6. Low melting point alloy organic phase change thermal conductive composite material roll; 7. Compressible silicone rubber layer; 8. Heating and melting cylinder; 9. Molten low melting point alloy organic phase change thermal conductive composite material; 10. Square support block; 11. Cutter; 12. Height adjustment rod; 13. Square shell support block; 14. Rectangular groove bottom; 15. Heating controller; 16. Air pipe; 17. Organic phase change thermal conductive material sheet; 18. Low melting point alloy sheet; 19. Steel wire fixed shaft; 20. Spring; 21. Rectangular groove; 22. Metal ring gasket; 23. Stainless steel pull rod; 24. ABS plastic handle; 25. Heating and melting cylinder bottom; 26. Stainless steel wire; 27. Compressed air controller; 28. Heat dissipation substrate DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0020] Embodiment 1:

[0021] Combined with Figure 1A molding device for a low melting point alloy organic phase change thermal conductive composite material includes an extrusion system, an air pipe 16 and a compressed air controller 27. The extrusion system is composed of an air pipe two-way joint 1, a sealing cover 2, a rubber sealing ring 3, an extrusion cylinder 5, a push plug 4, a compressible silicone rubber layer 7, a heating and melting cylinder 8, a heating controller 15, a square support block 10, a square shell support block 13, a cutter 11 and a height adjustment rod 12. The trachea two-way joint 1 is located in the middle position of the top of the sealing cover 2, the extrusion cylinder 5 is 100mm high, the inner diameter is 35mm, and the wall thickness is 2mm. The inner diameter of the rubber sealing ring 3 is 33mm and the outer diameter is 35mm. The inner wall of the sealing cover 2 has an internal thread, and the outer wall of the upper end of the extrusion cylinder 5 has an external thread. The internal thread of the inner wall of the sealing cover 2 and the internal thread of the outer wall of the upper end of the extrusion cylinder 5 match each other; a 0.5mm thick compressible silicone rubber layer 7 is adhered to the inner wall of the extrusion cylinder 5, with a height of 100mm. There is also a push-on plug 4 in the extrusion cylinder 5, which is made of polypropylene, has a diameter of 34.8mm and a thickness of 10mm. 42 parts by mass of tin and 58 parts by mass of bismuth are heated and melted to obtain a tin-bismuth alloy liquid with a melting point of 139°C, which is cooled to 50-60°C and rolled into a 0.2mm tin-bismuth alloy sheet; 10 parts of phase change polymer material, 20 parts of zinc oxide powder, and 70 parts of aluminum oxide powder are melted and mixed evenly, and the phase change temperature range is 125-140°C. The organic phase change thermal conductive material sheet is rolled to obtain a 0.2mm thick organic phase change thermal conductive material sheet. The organic phase change thermal conductive material has high viscosity at 139-140°C. A 0.2mm tin-bismuth alloy sheet is sandwiched between two layers of 0.2mm thick organic phase change thermal conductive material sheets. The 0.2mm thick tin-bismuth alloy sheet and the organic phase change thermal conductive material sheet are stacked and wound into a low melting point alloy organic phase change thermal conductive composite material roll 6 with a diameter of 34.8mm. The heating and melting cylinder 8 is located at the lower end of the extrusion cylinder 5, with an inner diameter of 35mm and a height of 100mm. The outer diameter of the heating and melting cylinder is 60mm. The structure of the heating and melting cylinder 8 is a 2mm stainless steel layer, a resistance wire heating layer, a heat preservation cotton layer and a stainless steel outer shell layer from the inside to the outside. The inner stainless steel layer of the heating and melting cylinder 8 and the stainless steel extrusion cylinder 5 are seamlessly welded together. The heating controller 15 is located on one side of the outside of the heating and melting cylinder 8, connected to the resistance wire heating layer in the heating and melting cylinder 8, and controls the heating temperature. The heating controller 15 can set the control heating range: room temperature to 200°C, and the temperature control accuracy is ±2°C.The square support block 10 and the square shell support block 13 are cast from epoxy molding plastic, which wraps and fixes the lower 25-35% of the heating and melting cylinder body from all sides, and supports the heating and melting cylinder 8 and the extrusion cylinder above. The heating and melting cylinder 8 is located at the center of the square support block 10, and the length and width of the square support block 10 are both 90mm; the bottom of the square support block 10 is the square shell support block 13, and the top center of the square shell support block 13 is the extrusion port 25 of the bottom of the heating and melting cylinder. The square shell support block 13 is 10-20mm high, the shell wall thickness is 5mm, and the square shell support block The length and width of 13 are equal, both of which are 90mm; there are a pair of parallel rectangular grooves 21 on both sides of the top of the square shell-shaped support block 13, the two rectangular grooves 21 are on the same horizontal plane, parallel to the bottom 25 of the heating and melting tube, the opening of the rectangular groove 21 faces the extrusion outlet at the bottom of the heating and melting tube 8, the width of the rectangular groove 21 is 5mm, the height is 5mm, the length of the rectangular groove 21 is 80mm, and the vertical distance between the bottom edge 14 of the rectangular groove and the bottom 25 of the heating and melting tube is 2mm; the square shell-shaped support block 13 is loaded with a cutter 11 through the rectangular groove 21. The cutter 11 comprises a stainless steel wire 26, two steel wire fixing shafts 19, two springs 20, two stainless steel pull rods 23, two metal annular gaskets 22 and an ABS plastic handle 24; the stainless steel wire 26 has a diameter of 0.5 mm and a length of 70 mm, and both ends of the stainless steel wire 26 are connected to a steel wire fixing shaft 19, and the steel wire fixing shaft 19 is loaded in a rectangular groove 21 of a square shell-shaped support block, and the steel wire fixing shaft 19 is made of cylindrical stainless steel, with a diameter of 4 mm and a length of 5 mm, and both ends of the stainless steel wire 26 are connected to the axis of the steel wire fixing shaft 19; the two stainless steel pull rods 23 have a diameter of 2 mm, and each is covered with a spring 20 and a metal annular gasket 2 2 and then pass through the circular hole of the square shell-shaped support block 14. The center position of the circular hole of the square shell-shaped support block 14 is 2mm upward from the bottom edge 14 of the rectangular groove. One end of the two stainless steel pull rods 23 is vertically connected to the steel wire fixing shaft 19, and the other end is respectively connected to the two ends of the ABS plastic handle outside the square shell-shaped support block. The inner diameter of the circular hole of the bottom shell of the square support block 10 is 2.4mm, the inner diameter of the metal ring gasket 22 is 3mm, the outer diameter is 5mm, the outer diameter of the spring 20 is 4mm, and the spliced ​​length of the spring 20 is the same as the length of the rectangular groove 21; the rectangular frame composed of the stainless steel wire 26, the steel wire fixing shaft 19, the stainless steel pull rod 23 and the ABS plastic handle 24 is parallel to the bottom 25 of the heating and melting cylinder. The height adjustment rod 12 is located at the four corners of the square support block 10 and the square shell support block 13. The height adjustment rod is a precision screw. The height adjustment is achieved by rotating the precision screw to adjust the distance between the bottom of the heating and melting cylinder and the surface of the radiator; the height adjustment rod 12 can adjust the distance between the bottom of the heating and melting cylinder 8 and the surface of the heat dissipation substrate to 0-10mm.The air pipe 16 connects the compressed air controller 27 and the air pipe two-way connector 1 of the extrusion system. The compressed air controller 27 contains a pressure regulating knob and a timer, which can adjust the pressure of the compressed air and the continuous pressurization time. Put the tin-bismuth alloy organic phase change thermal conductive composite material roll 6 with a diameter of 34.8mm and a height of 190mm into the extrusion barrel 5, then put the push plug 4 and the rubber sealing ring 3, tighten the sealing cover 2 clockwise, set the pressure to 30Psi through the compressed air controller 27, and the pressurization time for 10 seconds. Rotate the height adjustment rod 12 to adjust the extrusion height of the tin-bismuth alloy organic phase change thermal conductive composite material to 0.5mm, set the heating and melting temperature to 145℃ through the heating controller 15 on the heating and melting barrel 8 to start heating, and the lower end of the tin-bismuth alloy organic phase change thermal conductive composite material 6 is melted in the heating and melting barrel 8. Under the push of the compressed air pressure, the molten tin-bismuth alloy organic phase change thermal conductive composite material 9 is extruded from the bottom of the heating and melting barrel 8. When When it contacts the surface of the heat dissipation substrate, the ABS plastic handle 24 is pulled, the spring 20 is compressed, and the stainless steel wire 26 is pulled by the stainless steel pull rod 23 through the wire fixing shaft 19 to move to the bottom extrusion port of the heating and melting tube 8, close to the bottom extrusion port of the heating and melting tube 8, and cuts the molten tin-bismuth alloy organic phase change thermal conductive composite material 9. The height of the molten tin-bismuth alloy organic phase change thermal conductive composite material 9 is 0.5 mm. When the ABS plastic 24 handle is released, the compressed spring 20 is released, and the stainless steel wire 26 returns to its original position. The obtained molten tin-bismuth alloy organic phase change thermal conductive composite material 9 has uniformly distributed tin-bismuth alloy in a circle and is isolated by the organic phase change thermal conductive material. After cooling and melting, it will not overflow and pollute other electronic components.

Claims

1. A molding device for a low melting point alloy organic phase change thermal conductive composite material, characterized in that: It includes an extrusion system, an air pipe and a compressed air controller; the extrusion system includes a sealing cover, a rubber sealing ring, an extrusion barrel, a push plug, a compressible silicone rubber layer, a low melting point alloy organic phase change thermal conductive composite material roll, a heating melting barrel, a heating controller, a square support block, a square shell support block, a cutter and a height adjustment rod, and an air pipe two-way joint; the sealing cover is located at the top of the extrusion system, and there is an air pipe two-way joint at the center of the top of the sealing cover, and the inner wall of the sealing cover has an internal thread; the extrusion barrel is a stainless steel cylinder with a height of 50-150mm, a wall thickness of 2mm, and an inner diameter of 20-50mm. The outer wall of the upper end of the extrusion cylinder is provided with an external thread, and the internal thread of the inner wall of the sealing cover and the internal thread of the outer wall of the upper end of the extrusion cylinder cooperate with each other; the rubber sealing ring is located between the inner top of the sealing cover and the top of the extrusion cylinder, the inner diameter of the rubber sealing ring is 2mm smaller than the inner diameter of the extrusion cylinder, and the outer diameter of the rubber sealing ring is equal to the outer diameter of the extrusion cylinder; the compressible silicone rubber layer is adhered to the inner wall of the extrusion cylinder, with a thickness of 0.5mm, and the height of the compressible silicone rubber layer is equal to the height of the extrusion cylinder; the push-on plug is made of plastic material, located in the extrusion cylinder, below the rubber sealing ring, the diameter of the push-on plug is 0.2mm smaller than the inner diameter of the extrusion cylinder, and the push-on plug is The thickness is 10mm; the low-melting-point alloy organic phase-change thermal conductive composite material roll is formed by stacking and winding a 0.05-0.5mm thick low-melting-point alloy sheet and an organic phase-change thermal conductive material sheet, a low-melting-point alloy sheet is sandwiched between two layers of organic phase-change thermal conductive material sheets, and the outer layer is ensured to be an organic phase-change thermal conductive material sheet during winding, the organic phase-change thermal conductive material sheet is viscous within room temperature to 150°C, the molten low-melting-point alloy liquid can be adhered to the organic phase-change thermal conductive material and will not migrate, and the melting point of the low-melting-point alloy is lower than 150°C; the low-melting-point alloy organic phase-change thermal conductive composite material roll is straight The diameter of the low-melting-point alloy organic phase-change thermal conductive composite material is smaller than the inner diameter of the extrusion cylinder, the difference between the diameter of the low-melting-point alloy organic phase-change thermal conductive composite material roll and the inner diameter of the extrusion cylinder is smaller than the thickness of the compressible silicone rubber layer of 0.5mm, the length of the low-melting-point alloy organic phase-change thermal conductive composite material after winding is smaller than the sum of the lengths of the extrusion cylinder and the heating and melting cylinder, the low-melting-point alloy organic phase-change thermal conductive composite material roll is located below the advancing piston; the heating and melting cylinder is located at the lower end of the extrusion cylinder, the inner diameter of the heating and melting cylinder is equal to the inner diameter of the extrusion cylinder, the height of the heating and melting cylinder is 50-150mm, the outer diameter of the heating and melting cylinder is 50-80mm, and the inner wall of the heating and melting cylinder is adhered with 0.A 5mm thick compressible silicone rubber layer, the height of which is equal to the height of the heating and melting cylinder. The structure of the heating and melting cylinder is, from the inside to the outside, a compressible silicone rubber layer, a 2mm stainless steel layer, a resistance wire heating layer, a thermal insulation cotton layer and a stainless steel outer shell layer. The inner stainless steel layer of the heating and melting cylinder is connected to the lower end of the extrusion cylinder by seamless welding; the heating controller is installed on one side of the outside of the heating and melting cylinder, connected to the resistance wire heating layer in the heating and melting cylinder, the square support block and the square shell support block are cast from epoxy molding compound, and the lower 25-35% of the heating and melting cylinder body is wrapped and fixed from all sides, supporting the heating and melting cylinder and the extrusion cylinder above, and the heating and melting cylinder is located at the center of the square support block. The length and width of the square support block are equal and are 30-40mm larger than the outer diameter of the heating and melting cylinder; the square shell support block is located at the bottom of the square support block, and the top center of the square shell support block is the bottom of the heating and melting cylinder. The square shell support block is 10-20mm high and 5mm thick. The length and width of the square shell support block are equal and consistent with the length and width of the square support block. There are a pair of parallel rectangular grooves on both sides of the top of the square shell support block. The two rectangular grooves are on the same horizontal plane and parallel to the bottom outlet of the heating and melting cylinder. The opening of the rectangular groove faces the extrusion outlet at the bottom of the heating and melting cylinder. The vertical distance from the bottom outlet of the heating and melting cylinder to the bottom edge of the rectangular groove is 2mm. The width of the rectangular groove is 5mm, the height is 5mm, the thickness of the bottom edge of the rectangular groove is 5mm, and the length of the rectangular groove is 10mm shorter than the length of the square shell support block. The cutter is installed in the rectangular groove of the square shell support block. The cutter comprises a stainless steel wire, two steel wire fixing shafts, two springs, two stainless steel pull rods, two metal annular gaskets and an ABS plastic handle. The diameter of the stainless steel wire is 0.5mm, the length is greater than the outer diameter of the bottom of the heating and melting cylinder, the length of the stainless steel wire is 20mm less than the length of the square shell support block, and the two ends of the stainless steel wire are respectively connected to a wire fixing shaft. The wire fixing shaft is made of cylindrical stainless steel, with a diameter of 4mm and a length of 5mm. The two ends of the stainless steel wire are connected to the axis of the wire fixing shaft. When the stainless steel wire passes horizontally through the bottom outlet of the heating and melting cylinder, it is tangent to the bottom of the heating and melting cylinder. The wire fixing shaft is loaded in the rectangular groove of the square shell support block. The two stainless steel pull rods are each covered with a spring and a metal ring gasket and then pass through the circular hole in the shell wall of the square shell support block. The center of the circular hole is located 2mm above the bottom edge of the rectangular groove. One end of the two stainless steel pull rods is respectively connected to the wire fixing shaft vertically, and the other end is respectively connected to the two ends of the ABS plastic handle outside the square shell support block. The outer diameter of the stainless steel pull rod is < square support block The inner diameter of the circular hole of the bottom shell is less than the inner diameter of the metal ring gasket. The length of the spring is the same as the length of the rectangular groove, and the outer diameter is less than the outer diameter of the metal ring gasket. The outer diameter of the metal ring gasket is ≤5mm. The rectangular frame composed of the stainless steel wire, the steel wire fixed shaft, the stainless steel pull rod and the ABS plastic handle is parallel to the bottom of the heating and melting cylinder. The rectangular groove and the circular hole of the bottom shell are on the same plane. The height adjustment rod is located at the four corners of the square support block and the square shell support block. The height adjustment rod is a precision screw. The distance between the bottom of the heating and melting cylinder and the surface of the radiator is adjusted by rotating the precision screw. The height adjustment rod can adjust the height range of 0-10mm. The air pipe is connected to the compressed air controller and the air pipe two-way joint of the extrusion system. The compressed air controller contains a pressure adjustment knob and a timer, which can adjust the pressure and continuous pressurization time of the compressed air. .

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