High-voltage high-power-density fine armored heating cable

Abstract

The invention relates to the technical field of heating cable processing, in particular to a high-voltage high-power-density fine armored heating cable which comprises an outer sleeve, sealant is arranged at the left end and the right end of the outer sleeve, an insulating layer is arranged in the outer sleeve, a heating wire is arranged in the outer sleeve, and a protection tube is arranged on the surface of the insulating layer. According to the invention, through the innovative structural design and material combination, the obvious comprehensive performance advantage is shown, and the pure nickel outer sleeve provides excellent mechanical protection and corrosion resistance, so that the composite pipe is suitable for chemical engineering, ocean and other severe environments; the high-purity magnesium oxide insulating layer ensures reliable insulation under a high-temperature condition, and meets the requirements of high-end fields such as aerospace and the like; the design of the spiral hastelloy heating wire realizes the characteristics of quick response and uniform heating, and is particularly suitable for precise temperature control occasions such as medical equipment, and the cable adopts an integrated cold-drawing forming process, so that a multi-layer structure is tightly combined, and the high power density is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of heating cable processing, in particular to a high-voltage and high-power-density fine armored heating cable. Background Art

[0002] Traditional heating cables have obvious limitations when dealing with high voltage, high power density and miniaturized application scenarios. Conventional structures mostly use a single design of a simple insulation layer wrapped around a straight heating wire. In high temperature environments, problems such as reduced insulation performance and uneven heat conduction are prone to occur. Existing armored cables generally have defects such as large outer diameter and insufficient flexibility, which make it difficult to meet the installation requirements of narrow spaces such as precision instruments and medical equipment. In terms of corrosion resistance, ordinary stainless steel outer sleeves are difficult to resist the erosion of acid and alkali media for a long time, which seriously affects the service life. The heating elements mostly use ordinary alloy materials, which have shortcomings such as slow response speed and low thermal efficiency and cannot meet the requirements of fast and precise temperature control. The insufficient thermal stability of the insulating material leads to performance degradation under high temperature conditions, posing a safety hazard. In addition, traditional manufacturing processes make it difficult to achieve precise molding of miniaturized structures, and product consistency and reliability are poor. These technical bottlenecks have seriously restricted the application of heating cables in high-end fields such as aerospace, marine engineering, and medical equipment. There is an urgent need to develop new high-performance micro-heating cable solutions. Summary of the Invention

[0003] To this end, the present invention provides a high-voltage and high-power density fine armored heating cable to solve the above-mentioned problems.

[0004] The present invention provides the following technical solution: a high-voltage, high-power density, fine armored heating cable, comprising an outer sleeve, sealant being provided at both left and right ends of the outer sleeve, an insulating layer being provided inside the outer sleeve, a heating wire being provided inside the outer sleeve, and a protective tube being provided on the surface of the insulating layer.

[0005] As a preferred solution of the present invention, the outer sleeve is a cylindrical N6 pure nickel tube, which is used to provide mechanical protection and corrosion resistance. The sealant is filled at both ends of the outer sleeve, and the sealant is used to ensure the sealing of the internal structure of the outer sleeve. The insulating layer is columnar magnesium oxide, and the insulating layer is filled in the outer sleeve. The insulating layer is used to provide high-temperature insulation performance. The heating wire is a spiral Hastelloy C276, and the heating wire is used for efficient heating. An insulating layer is provided inside the protective tube, and a heating wire is provided inside the insulating layer. The protective tube, insulating layer and heating wire are assembled as a whole and then cold-drawn into an integral part. After the protective tube, insulating layer and heating wire are assembled as a whole, the outer diameter is consistent and the structure is tight.

[0006] As a preferred solution of the present invention, the spiral structure design of the heating wire enables uniform heat distribution, and the surface area of ​​the heating wire is reduced by the spiral structure design to reduce energy loss.

[0007] As a preferred solution of the present invention, the thickness of the N6 pure nickel tube of the outer sleeve is 0.1-0.3 mm, the outer diameter of the outer sleeve is 1-3 mm, and the outer sleeve meets the requirements of high flexibility and easy installation.

[0008] As a preferred embodiment of the present invention, the purity of the columnar magnesium oxide of the insulating layer is above 99.5%, the filling density of the insulating layer is 3.0 to 3.5 g / cm³, and the insulating layer ensures insulation stability at high temperatures.

[0009] As a preferred solution of the present invention, the diameter of the heating wire is 0.05-0.1 mm, the spiral pitch of the heating wire is 0.2-0.5 mm, and the heating wire achieves high power density and rapid heating.

[0010] A method for preparing a high-voltage, high-power-density, fine armored heating cable, according to the high-voltage, high-power-density, fine armored heating cable, comprises the following steps: Step 1: Material preparation; Step 2: assembly; Step three, cold drawing; Step 4: Sealing.

[0011] As a preferred solution of the present invention, in steps one to four, more specifically: In step one, an N6 pure nickel tube is selected as the outer sleeve, Hastelloy C276 is selected as the heating wire material, and high-purity columnar magnesium oxide is selected as the insulating material; in step two, the spiral heating wire is placed in a protective tube, filled with a columnar magnesium oxide insulation layer, and the assembled structure is inserted into the N6 pure nickel tube; in step three, an integrated cold drawing is performed through a drawing die, and the outer diameter tolerance is controlled within ±0.05mm; in step four, high-temperature resistant sealant is filled at both ends of the outer sleeve, and a complete sealing structure is formed after curing. During the cold drawing process, the dimensional accuracy of the drawing die is ±0.01mm, and the cold drawing speed is 0.5-1.0m / min. The sealant is high-temperature resistant silicone rubber. The sealant is first melted using a hot melt machine, and the hot melt colloid is filled into both ends of the outer sleeve and then cured. The curing temperature is 150-200°C and the curing time is 30-60 minutes. The spiral structure of the heating wire is processed by a precision winding machine, and the winding accuracy is ±0.02mm.

[0012] As a preferred solution of the present invention, the hot melt machine includes a support frame, the number of the support frames is two, and the two support frames are symmetrically distributed on the left and right sides, the front and rear sides of the inner side of the support frame are fixedly connected to the first support plate, the inner wall of the first support plate is rotatably connected to the hot melt barrel, the front side of the hot melt barrel is fixedly connected to the front end cover, the top of the first support plate on the rear side is fixedly connected to the second support plate, the inner wall of the second support plate is rotatably connected to the rotating rod, the front end of the rotating rod is fixedly connected to the cylindrical cam, the surface of the rotating rod is fixedly connected to the driving gear, and the surface of the hot melt barrel is fixedly connected to the driven gear. The surface of the driven gear is meshed with the surface of the driving gear, the rear side of the first support plate on the front side is fixedly connected to the limit plate, the surface of the limit plate is slidably connected to the matching frame, the top of the matching frame is fixedly connected to the driven rod, the surface of the cylindrical cam is provided with a folding groove connected end to end, the inner wall of the folding groove is slidingly connected to the surface of the driven rod, the bottom of the matching frame is fixedly connected to a heating ring, the inner ring of the heating ring is slidably connected to the surface of the hot melt barrel, the rear side of the second support plate is fixedly connected to a rotating motor, and the output end of the rotating motor is fixedly connected to the rear end of the rotating rod through a coupling.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, through innovative structural design and material combination, significant comprehensive performance advantages are demonstrated. The pure nickel outer sleeve provides excellent mechanical protection and corrosion resistance, making it suitable for harsh environments such as chemical and marine environments; the high-purity magnesium oxide insulation layer ensures reliable insulation under high temperature conditions, meeting the needs of high-end fields such as aerospace; the spiral Hastelloy heating wire design achieves fast response and uniform heating characteristics, which is particularly suitable for precision temperature control occasions such as medical equipment. The cable adopts an integrated cold-drawn forming process to tightly combine the multi-layer structure, which not only ensures high power density, but also improves mechanical strength and heat conduction efficiency. Its fine and flexible characteristics facilitate complex wiring in a small space, and can be widely used in industrial robots, precision instruments and other scenarios. The overall design achieves a perfect balance of high reliability, long life and excellent thermal performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic structural diagram of the hot melt machine of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the local structure of the hot melt machine; Figure 4 This is a flow chart of the preparation method of the high-voltage and high-power density fine armored heating cable in the present invention.

[0015] In the figure: 1. Outer sleeve; 2. Sealant; 3. Insulation layer; 4. Heating wire; 5. Protective tube; 6. Support frame; 7. First support plate; 8. Front end cover; 9. Hot melt barrel; 10. Second support plate; 11. Rotating motor; 12. Rotating rod; 13. Driving gear; 14. Cylindrical cam; 15. Return groove; 16. Driven rod; 17. Matching frame; 18. Limiting plate; 19. Heating ring; 20. Driven gear. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] See also Figures 1-4 The technical solution provided by the present invention specifically includes the following embodiments: Embodiment: A high-voltage, high-power-density fine armored heating cable comprises an outer sleeve 1, sealant 2 is provided at both ends of the outer sleeve 1, an insulating layer 3 is provided inside the outer sleeve 1, a heating wire 4 is provided inside the outer sleeve 1, and a protective tube 5 is provided on the surface of the insulating layer 3; the outer sleeve 1 is a cylindrical N6 pure nickel tube, the outer sleeve 1 is used to provide mechanical protection and corrosion resistance, the sealant 2 is filled at both ends of the outer sleeve 1, the sealant 2 is used to ensure the sealing of the internal structure of the outer sleeve 1, the insulating layer 3 is columnar magnesium oxide, the insulating layer 3 is filled in the outer sleeve 1, the insulating layer 3 is used to provide high-temperature insulation performance, the heating wire 4 is a spiral Hastelloy C276, the heating wire 4 is used for efficient heating, the insulating layer 3 is provided inside the protective tube 5, the heating wire 4 is provided inside the insulating layer 3, the protective tube 5, the insulating layer 3 and the heating wire 4 are assembled as a whole and then subjected to one-piece cold drawing forming, the outer diameter of the protective tube 5, the insulating layer 3 and the heating wire 4 are consistent and the structure is tight after the overall assembly; The cable's fine armored structure gives it significant advantages in extreme environments. The pure nickel outer sleeve 1 is resistant to acid and alkali corrosion and is suitable for chemical or marine environments. The high-temperature stability of the magnesium oxide insulation layer 3 makes it potential in aerospace heating systems. The fast response characteristics of the spiral heating wire 4 meet the medical equipment's needs for instantaneous temperature control. In addition, the cable's flexibility supports complex path laying, such as internal cables of industrial robots or heating modules of precision instruments. The automated sealing process further ensures the reliability of mass production, and the cold drawing technology ensures product consistency. The cable has a balance between high power density and long life.

[0018] The spiral structure design of the heating wire 4 ensures uniform heat distribution. The spiral structure design reduces the surface area of ​​the heating wire 4 to reduce energy loss. The thickness of the N6 pure nickel tube of the outer sleeve 1 is 0.1-0.3mm, and the outer diameter of the outer sleeve 1 is 1-3mm. The outer sleeve 1 meets the requirements of high flexibility and easy installation. The purity of the columnar magnesium oxide of the insulating layer 3 is greater than 99.5%, and the filling density of the insulating layer 3 is 3.0-3.5g / cm³. The insulating layer 3 ensures insulation stability under high temperatures. The diameter of the heating wire 4 is 0.05-0.1mm, and the spiral pitch of the heating wire 4 is 0.2-0.5mm. The heating wire 4 achieves high power density and rapid heating. Through the coordinated design of the multi-layer composite structure, the cable has a balance between high power density and long life. The outer sleeve 1 adopts an ultra-thin N6 pure nickel tube, which has excellent mechanical strength and corrosion resistance. Its cylindrical structure provides a uniform protective space for internal components. The spiral Hastelloy heating wire 4 is formed into a compact spiral layout through precision winding. This design not only increases the effective heating length, but also optimizes the heat conduction efficiency by controlling the spiral pitch to avoid local overheating. The insulating layer 3 adopts high-purity columnar magnesium oxide. Its tight filling characteristics ensure the stability of the insulation performance at high temperatures. At the same time, it jointly constrains the spatial position of the heating wire with the protective tube to prevent structural deformation caused by vibration or bending. The protective tube 5, the insulating layer 3 and the heating wire 4 are integrated into a cold drawing process to form a tight structure without gaps, which significantly improves the mechanical strength and heat conduction uniformity of the cable.

[0019] A preparation method of a high-voltage and high-power density fine armored heating cable, comprising the following steps: step one, material preparation; step two, assembly; step three, cold drawing; step four, sealing; in steps one to four, more specifically: in step one, select N6 pure nickel tube as outer sleeve, select Hastelloy C276 as heating wire material, select high-purity columnar magnesium oxide as insulation material; in step two, place the spiral heating wire in a protective tube, fill it with a columnar magnesium oxide insulation layer, and insert the assembled structure into the N6 pure nickel tube; in step three, perform integrated cold drawing through a drawing die, Pull out, control the outer diameter tolerance within ± 0.05mm; in step 4, fill the two ends of the outer sleeve with high temperature resistant sealant, and form a complete sealing structure after curing. During the cold drawing process, the dimensional accuracy of the drawing die is ± 0.01mm, the cold drawing speed is 0.5-1.0m / min, and the sealant is a high temperature resistant silicone rubber. The sealant is first melted using a hot melt machine, and the hot melt colloid is filled into both ends of the outer sleeve before curing. The curing temperature is 150-200°C and the curing time is 30-60 minutes. The spiral structure of the heating wire is processed by a precision winding machine with a winding accuracy of ± 0.02mm. The cable preparation process revolves around two core elements: precision assembly and cold drawing. During the assembly stage, the spiral heating wire is precisely positioned in the protective tube and then filled with magnesium oxide insulating powder. Vibration compaction is used to ensure that the filling density reaches the ideal range. During the cold drawing process, the high-precision control of the drawing die enables the multi-layer structure to maintain uniform compression during plastic deformation, avoiding delamination or deformation defects. High-temperature resistant silicone rubber is used in the sealing link, and the ends are completely sealed through hot melt injection and curing processes, effectively isolating external moisture and corrosive media. It is worth noting that the spiral winding accuracy of the heating wire directly affects the power density distribution, and the reciprocating motion of the heating ring driven by the cylindrical cam ensures the uniform coating of the hot melt adhesive, further reflecting the coordinated optimization of process and equipment.

[0020] The hot melt machine includes a support frame 6, the number of the support frames 6 is two, and the two support frames 6 are symmetrically distributed on the left and right sides. The front and rear sides of the inner side of the support frame 6 are fixedly connected to the first support plate 7, the inner wall of the first support plate 7 is rotatably connected to the hot melt barrel 9, the front side of the hot melt barrel 9 is fixedly connected to the front end cover 8, the top of the first support plate 7 on the rear side is fixedly connected to the second support plate 10, the inner wall of the second support plate 10 is rotatably connected to the rotating rod 12, the front end of the rotating rod 12 is fixedly connected to the cylindrical cam 14, the surface of the rotating rod 12 is fixedly connected to the driving gear 13, the surface of the hot melt barrel 9 is fixedly connected to the driven gear 20, and the surface of the driven gear 20 is fixedly connected to the hot melt barrel 9. The surface of the driving gear 13 is meshed, and the rear side of the first support plate 7 on the front side is fixedly connected to the limit plate 18, and the surface of the limit plate 18 is slidably connected to the matching frame 17. The top of the matching frame 17 is fixedly connected to the driven rod 16. The surface of the cylindrical cam 14 is provided with a return groove 15 connected end to end. The inner wall of the return groove 15 is slidably connected to the surface of the driven rod 16. The bottom of the matching frame 17 is fixedly connected to a heating ring 19. The inner ring of the heating ring 19 is slidably connected to the surface of the hot melt barrel 9. The rear side of the second support plate 10 is fixedly connected to a rotating motor 11, and the output end of the rotating motor 11 is fixedly connected to the rear end of the rotating rod 12 through a coupling; The hot melt machine converts rotational motion into linear reciprocating motion to meet the uniform heating requirements of the hot melt adhesive. When the rotating motor 11 drives the cylindrical cam 14 to rotate, the trajectory of the return groove 15 forces the driven rod 16 to drive the matching frame 17 to slide up and down along the limit plate 18, so that the heating ring 19 fixed at the bottom of the matching frame 17 moves periodically along the surface of the hot melt barrel 9. At the same time, the driving gear 13 engages the driven gear 20 to make the hot melt barrel 9 rotate synchronously, ensuring that the heat of the heating ring 19 is evenly distributed to the barrel surface. This "rotation + reciprocating" composite motion mode avoids local overheating and improves the hot melting efficiency of the sealant. The structural symmetry of the equipment enhances the operational stability, and the closed curve characteristics of the cam groove realize the automatic return of the heating ring 19 without the need for additional control logic.

[0021] The present invention, the high voltage and high power density fine armored heating cable achieves a performance balance of mechanical strength, corrosion resistance, high temperature insulation and efficient heating through an innovative multi-layer composite structure design; its core lies in the use of ultra-thin pure nickel material as a cylindrical outer sleeve 1, which has both excellent protective performance and flexibility, and provides a uniform protective space for internal components; the spiral Hastelloy heating wire 4 is formed into a compact layout through precision winding, which not only increases the effective heating length, but also achieves uniform heat distribution and rapid response through the optimized spiral pitch design; the high-purity columnar magnesium oxide insulation layer 3 ensures insulation stability in a high temperature environment in a dense filling manner, and at the same time cooperates with the protective tube 5 to constrain the position of the heating wire 4, effectively resisting structural deformation caused by vibration or bending; the protective tube 5, the insulation layer 3 and the heating wire 4 are integrated into a cold drawing process to form a gapless and tight structure, which significantly improves the mechanical strength and heat conduction uniformity; this collaborative design enables the cable to exhibit excellent performance in extreme environments, the pure nickel outer sleeve 1 can resist acid and alkali corrosion, and is suitable for chemical or marine environments; the high temperature stability of the magnesium oxide insulation layer 3 expands its application potential in the aerospace field; and the spiral The rapid response characteristics of the heating wire 4 meet the stringent requirements of medical equipment for instantaneous temperature control; the cable preparation process revolves around two core technologies: precision assembly and cold drawing; during the assembly stage, the spiral heating wire 4 is precisely positioned and the insulating material 3 is vibrated and compacted to ensure structural tightness and functional integrity; the cold drawing process uses high-precision molds to control the uniform compression of the multi-layer structure to avoid delamination or deformation defects; the sealing link uses high-temperature resistant sealant 2, and the ends are completely sealed through hot melt injection and curing processes to effectively isolate the external environment from erosion; the preparation equipment adopts a unique motion conversion mechanism to convert rotational power into a composite motion mode of the heating ring 19, and ensures uniform heat distribution through synchronous rotation and reciprocating movement to avoid local overheating; this coordinated optimization of process and equipment not only ensures the consistency of product performance, but also realizes the mass production of complex structures; the cable's fine armored structure gives it significant advantages in confined space applications such as internal cables of industrial robots and heating modules of precision instruments; its high flexibility supports complex path laying, and the balanced characteristics of high power density and long life meet the stringent requirements of modern industry for high-efficiency and energy-saving equipment.

[0022] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A high voltage and high power density fine armored heating cable, characterized by: The outer sleeve (1) comprises an outer sleeve (1), wherein both left and right ends of the outer sleeve (1) are provided with sealant (2), an insulating layer (3) is provided inside the outer sleeve (1), a heating wire (4) is provided inside the outer sleeve (1), and a protective tube (5) is provided on the surface of the insulating layer (3).

2. The high voltage and high power density fine armored heating cable according to claim 1, characterized in that: The outer sleeve (1) is a cylindrical N6 pure nickel tube, and the outer sleeve (1) is used to provide mechanical protection and corrosion resistance. The sealant (2) is filled at both ends of the outer sleeve (1), and the sealant (2) is used to ensure the sealing of the internal structure of the outer sleeve (1). The insulating layer (3) is columnar magnesium oxide, and the insulating layer (3) is filled in the outer sleeve (1), and the insulating layer (3) is used to provide high-temperature insulation performance. The heating wire (4) is a spiral Hastelloy C276, and the heating wire (4) is used for efficient heating. The interior of the protective tube (5) is provided with an insulating layer (3), and the interior of the insulating layer (3) is provided with a heating wire (4). The protective tube (5), the insulating layer (3) and the heating wire (4) are assembled as a whole and then subjected to one-piece cold drawing. After the protective tube (5), the insulating layer (3) and the heating wire (4) are assembled as a whole, the outer diameters of the protective tube (5), the insulating layer (3) and the heating wire (4) are consistent and the structure is compact.

3. The high voltage and high power density fine armored heating cable according to claim 2, characterized in that: The spiral structure design of the heating wire (4) enables uniform heat distribution, and the heating wire (4) reduces the surface area through the spiral structure design to reduce energy loss.

4. The high voltage and high power density fine armored heating cable according to claim 2, characterized in that: The thickness of the N6 pure nickel tube of the outer sleeve (1) is 0.1 to 0.3 mm, the outer diameter of the outer sleeve (1) is 1 to 3 mm, and the outer sleeve (1) meets the requirements of high flexibility and easy installation.

5. The high voltage and high power density fine armored heating cable according to claim 2, characterized in that: The purity of the columnar magnesium oxide of the insulating layer (3) is above 99.5%, the filling density of the insulating layer (3) is 3.0-3.5 g / cm³, and the insulating layer (3) ensures insulation stability at high temperatures.

6. The high voltage and high power density fine armored heating cable according to claim 2, characterized in that: The diameter of the heating wire (4) is 0.05-0.1 mm, the spiral pitch of the heating wire (4) is 0.2-0.5 mm, and the heating wire (4) achieves high power density and rapid heating.

7. A method for preparing a high-voltage, high-power-density fine armored heating cable, according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Material preparation; Step 2: assembly; Step three, cold drawing; Step 4: Sealing.

8. The method for preparing a high-voltage and high-power-density fine armored heating cable according to claim 7, characterized in that: In steps one to four, the more specific ones are: In step one, an N6 pure nickel tube is selected as the outer sleeve, Hastelloy C276 is selected as the heating wire material, and high-purity columnar magnesium oxide is selected as the insulating material; in step two, the spiral heating wire is placed in a protective tube, filled with a columnar magnesium oxide insulation layer, and the assembled structure is inserted into the N6 pure nickel tube; in step three, an integrated cold drawing is performed through a drawing die, and the outer diameter tolerance is controlled within ±0.05mm; in step four, high-temperature resistant sealant is filled at both ends of the outer sleeve, and a complete sealing structure is formed after curing. During the cold drawing process, the dimensional accuracy of the drawing die is ±0.01mm, and the cold drawing speed is 0.5-1.0m / min. The sealant is high-temperature resistant silicone rubber. The sealant is first melted using a hot melt machine, and the hot melt colloid is filled into both ends of the outer sleeve and then cured. The curing temperature is 150-200°C and the curing time is 30-60 minutes. The spiral structure of the heating wire is processed by a precision winding machine, and the winding accuracy is ±0.02mm.

9. The method for preparing a high-voltage and high-power-density fine armored heating cable according to claim 8, characterized in that: The hot melt machine includes a support frame (6), the number of the support frames (6) is two, and the two support frames (6) are symmetrically distributed on the left and right sides. The front and rear sides of the inner side of the support frame (6) are fixedly connected to a first support plate (7), the inner wall of the first support plate (7) is rotatably connected to a hot melt barrel (9), the front side of the hot melt barrel (9) is fixedly connected to a front end cover (8), the top of the first support plate (7) on the rear side is fixedly connected to a second support plate (10), the inner wall of the second support plate (10) is rotatably connected to a rotating rod (12), the front end of the rotating rod (12) is fixedly connected to a cylindrical cam (14), the surface of the rotating rod (12) is fixedly connected to a driving gear (13), the surface of the hot melt barrel (9) is fixedly connected to a driven gear (20), and the surface of the driven gear (20) is fixedly connected to the driven gear (20). The surface of the first support plate (7) meshes with the surface of the driving gear (13); the rear side of the first support plate (7) on the front side is fixedly connected to a limit plate (18); the surface of the limit plate (18) is slidably connected to a matching frame (17); the top of the matching frame (17) is fixedly connected to a driven rod (16); the surface of the cylindrical cam (14) is provided with a return groove (15) connected end to end; the inner wall of the return groove (15) is slidably connected to the surface of the driven rod (16); the bottom of the matching frame (17) is fixedly connected to a heating ring (19); the inner ring of the heating ring (19) is slidably connected to the surface of the hot melt barrel (9); the rear side of the second support plate (10) is fixedly connected to a rotating motor (11); the output end of the rotating motor (11) is fixedly connected to the rear end of the rotating rod (12) through a coupling.

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