Hot runner heating device for mold injection molding

Abstract

The hot runner heating device for mold injection molding comprises a hot runner outer shell, a heating sleeve and a heat conduction cylinder, the hot runner outer shell is connected with a mold injection molding machine, the heat conduction cylinder is arranged on the outer side of the hot runner outer shell in a sleeving mode, and the space between the inner side wall of the heat conduction cylinder and the outer side wall of the hot runner outer shell is filled with a heat preservation material; the heat conduction cylinder is sleeved with the heating sleeve, a heat conduction bin is formed between the inner side wall of the heating sleeve and the outer side wall of the heat conduction cylinder, and a heat conduction fin assembly is installed in the heat conduction bin. The plastic in the hot runner of the mold injection molding machine is kept in a molten state, and the mold processing quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of mold injection molding, and in particular to a hot runner heating device for mold injection molding. Background Art

[0002] The hot runner is a method of heating to keep the plastic in the runner and gate molten. Since a heating rod and a heating ring are set near or in the center of the runner, the entire runner from the nozzle outlet of the injection molding machine to the gate is in a high temperature state, so that the plastic in the runner remains molten. After stopping the machine, it is generally not necessary to open the runner to remove the condensate. When restarting the machine, it is only necessary to heat the runner to the required temperature. Therefore, the hot runner process is sometimes called a hot manifold system, or runnerless molding;

[0003] However, the heating uniformity of the heating rod or heating ring used in the traditional runner heating device is poor, resulting in uneven heating at various positions of the runner, affecting the subsequent mold processing quality. Therefore, it is necessary to design a hot runner heating device for mold injection molding. Summary of the invention

[0004] The present application provides a hot runner heating device for mold injection molding to solve the problem of poor heating uniformity in the prior art, which affects the mold processing quality. It realizes rapid and uniform heating of the hot runner outer shell, and can achieve long-term heat preservation after heating, ensuring that the plastic in the hot runner of the mold injection molding machine remains in a molten state, thereby improving the mold processing quality.

[0005] The present application provides a hot runner heating device for mold injection molding, comprising a hot runner outer shell, a heating sleeve and a heat-conducting cylinder;

[0006] The hot runner outer shell is connected to a mold injection molding machine;

[0007] The heat-conducting tube is sleeved on the outside of the hot runner outer shell, and a heat-insulating material is filled between the inner wall of the heat-conducting tube and the outer wall of the hot runner outer shell;

[0008] The heating sleeve is sleeved on the outside of the heat-conducting tube, and a heat-conducting chamber is formed between the inner wall of the heating sleeve and the outer wall of the heat-conducting tube;

[0009] A heat-conducting fin assembly is installed in the heat-conducting chamber.

[0010] Preferably, a heating component is also installed on the inner side of the heating sleeve, and the heating component includes a first heating coil and a second heating coil. The lower end of the first heating coil is fixedly connected to the lower end of the second heating coil via a first connecting piece, and a second connecting piece is fixedly installed on the front side of the upper end of the second heating coil. The second heating coil is fixedly connected to the upper end of the first heating coil adjacent to the right side via the second connecting piece, and a fixing component is fixedly installed between the first heating coil and the second heating coil.

[0011] Preferably, the fixing assembly includes a connecting block and a hinge, the connecting block is sleeved on the first coil, a rubber sleeve is fixedly installed on the inner wall of the connecting block, the hinge is fixedly installed on the right side of the left connecting block, and the right side of the hinge is fixedly connected to the left side of the right connecting block through a telescopic rod.

[0012] Preferably, the thermal fin assembly includes an upper thermal fin, a lower thermal fin, a first thermal fin group and a second thermal fin group, the first thermal fin group and the second thermal fin group are installed between the upper thermal fin and the lower thermal fin, the first thermal fin group adopts a plurality of positive U-shaped fins, the second thermal fin group adopts a plurality of inverted U-shaped fins, the positive U-shaped fins and the inverted U-shaped fins are cross-spaced, the upper thermal fin is welded to the inner wall of the heating sleeve, and the lower thermal fin is welded to the outer wall of the thermal sleeve.

[0013] Preferably, the thermal insulation material components include, by weight, 40-60 parts of expandable polypropylene, 12-28 parts of ethylene-vinyl acetate copolymer, 5-15 parts of high-clay attapulgite, 2-8 parts of brucite nanofibers, 1-4 parts of lithium oxide aerosol, 2-8 parts of expanded vermiculite, 3-12 parts of glass microspheres, 2-4 parts of polypropylene fibers, and 1-4 parts of carbon fibers.

[0014] Preferably, the heating sleeve comprises an upper heating sleeve and a lower heating sleeve, the cross-sections of the upper heating sleeve and the lower heating sleeve are both semicircular structures, the upper heating sleeve and the lower heating sleeve are spliced ​​into one body, and the upper heating sleeve and the lower heating sleeve are fixed by a hoop assembly.

[0015] Preferably, the hoop ring assembly includes an upper hoop ring and a lower hoop ring, and the upper hoop ring and the lower hoop ring are both semicircular structures. A first flange is provided at both ends of the upper hoop ring, and a second flange is provided at both ends of the lower hoop ring. Bolt mounting holes are provided on the first flange and the second flange, and locking adjustment bolts are installed in the bolt mounting holes.

[0016] Preferably, a method for using a hot runner heating device for mold injection molding comprises the following steps:

[0017] A. First, install the upper heating tube and the lower heating tube on the outer wall of the heat-conducting tube, and lock and fix them with the hoop assembly;

[0018] B. Control the first heating coil and the second heating coil to heat. The heat generated by the heating is transferred to the heat-conducting tube through the heat-conducting fin assembly. During the heating process, the distance between the first coil and the second coil is adjusted by controlling the telescopic rod, and the overall length of the electromagnetic heating coil is adjusted, thereby adjusting the heating area;

[0019] C. The heat transfer tube transfers the heat evenly to the hot runner outer shell, and the hot runner outer shell transfers the heat to the molten plastic inside;

[0020] D. The insulation material insulates the molten plastic to keep it in a molten state.

[0021] Beneficial effects:

[0022] (1) The present invention has a novel structural design and can achieve rapid and uniform heating of the hot runner outer shell, and can achieve long-term heat preservation after heating, ensuring that the plastic in the hot runner of the mold injection molding machine remains in a molten state, thereby improving the mold processing quality.

[0023] (2) In the present invention, the heating assembly installed on the inner side of the heating sleeve can achieve the purpose of uniform heating. In addition, the distance between the first coil and the second coil can be adjusted by controlling the telescopic rod, thereby adjusting the overall length of the electromagnetic heating coil, thereby achieving the purpose of adjusting the heating area and further improving the heating uniformity.

[0024] (3) The heat-conducting fin assembly used in the present invention can evenly conduct the heat generated by the heating coil to the heat-conducting tube, and the U-shaped fins arranged at staggered intervals can increase the heat-conducting area and uniformity.

[0025] (4) In the present invention, the heat-insulating material filled between the inner wall of the heat-conducting tube and the outer wall of the hot runner shell has a long-term heat-insulating effect, further improving the melting time of the molten plastic.

[0026] (5) In the present invention, the upper heating tube and the lower heating tube are spliced ​​into one body, and the upper heating tube and the lower heating tube are fixed by a hoop assembly. This structure facilitates the disassembly and assembly and subsequent maintenance of the heating tube, thereby reducing the use cost.

[0027] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 It is a side view of the present invention;

[0031] Figure 3 This is a schematic diagram of the heating assembly structure of the present invention;

[0032] Figure 4 It is a schematic diagram of the structure of the heat-conducting fin assembly of the present invention;

[0033] Figure 5 It is a schematic diagram of the structure of the hoop assembly of the present invention;

[0034] Explanation of the accompanying drawings: hot runner outer shell 1, heating sleeve 2, heat-conducting tube 3, first heating coil 4, second heating coil 5, first connecting piece 6, second connecting piece 7, connecting block 8, rubber sleeve 9, hinge 10, telescopic rod 11, filling insulation material 12, heat-conducting bin 13, heat-conducting fin assembly 14, upper heat-conducting plate 15, lower heat-conducting plate 16, positive U-shaped fin 17, inverted U-shaped fin 18, upper heating tube 19, lower heating tube 20, upper hoop 21, lower hoop 22, first flange 23, second flange 24, locking adjustment bolt 25. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present application. For example, in the description of the present application, the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.

[0039] In addition, the expressions of indicated directions such as the X direction, the Y direction, and the Z direction used to illustrate the operation and construction of the components of the present embodiment are not absolute but relative, and although these indications are appropriate when the components are in the positions shown in the figures, when these positions change, these directions should be interpreted differently to correspond to the changes.

[0040] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0041] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt or other fixing member; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0043] Embodiment 1:

[0044] See also Figure 1-Figure 4 , the present application discloses a hot runner heating device for mold injection, comprising a hot runner outer shell 1, a heating sleeve 2 and a heat-conducting sleeve 3;

[0045] The hot runner outer shell 1 is connected to the mold injection molding machine;

[0046] The heat-conducting tube 3 is sleeved on the outside of the hot runner outer shell 1, and the space between the inner wall of the heat-conducting tube 3 and the outer wall of the hot runner outer shell 1 is filled with a heat-insulating material 12;

[0047] The heating sleeve 2 is sleeved on the outside of the heat-conducting tube 3, and a heat-conducting chamber 13 is formed between the inner wall of the heating sleeve 2 and the outer wall of the heat-conducting tube 3;

[0048] A heat conducting fin assembly 14 is installed in the heat conducting chamber 13 .

[0049] In the present invention, a heating component is also installed on the inner side of the heating sleeve 2, and the heating component includes a first heating coil 4 and a second heating coil 5. The lower end of the first heating coil 4 is fixedly connected to the lower end of the second heating coil 5 through a first connecting piece 6, and a second connecting piece 7 is fixedly installed on the front side of the upper end of the second heating coil 5. The second heating coil 5 is fixedly connected to the upper end of the first heating coil 4 adjacent to the right side through the second connecting piece 7, and a fixing component is fixedly installed between the first heating coil 4 and the second heating coil 5; the fixing component includes a connecting block 8 and a hinge 10, and the connecting block 8 is sleeved on the first coil 4, and a rubber sleeve 9 is fixedly installed on the inner wall of the connecting block 8, and the hinge 10 is fixedly installed on the right side of the left connecting block 8, and the right side of the hinge 10 is fixedly connected to the left side of the right connecting block 8 through a telescopic rod 11. In the present invention, the heating assembly installed on the inner side of the heating sleeve can achieve the purpose of uniform heating. In addition, the distance between the first coil and the second coil can be adjusted by controlling the telescopic rod, thereby adjusting the overall length of the electromagnetic heating coil, thereby achieving the purpose of adjusting the heating area and further improving the heating uniformity.

[0050] In the present invention, the heat-conducting fin assembly 14 includes an upper heat-conducting fin 15, a lower heat-conducting fin 16, a first heat-conducting fin group and a second heat-conducting fin group, wherein the first heat-conducting fin group and the second heat-conducting fin group are installed between the upper heat-conducting fin 15 and the lower heat-conducting fin 16, the first heat-conducting fin group adopts a plurality of positive U-shaped fins 17, and the second heat-conducting fin group adopts a plurality of inverted U-shaped fins 18, wherein the positive U-shaped fins 17 and the inverted U-shaped fins 18 are arranged crosswise and at intervals, the upper heat-conducting fin 15 is welded to the inner wall of the heating sleeve 2, and the lower heat-conducting fin 16 is welded to the outer wall of the heat-conducting tube 3. The heat-conducting fin assembly adopted in the present invention can evenly conduct the heat generated by the heating coil to the heat-conducting tube, and the U-shaped fins arranged at staggered intervals can increase the heat conduction area and uniformity.

[0051] In the present invention, the heat-insulating material components include 40-60 parts of expandable polypropylene, 12-28 parts of ethylene-vinyl acetate copolymer, 5-15 parts of high-clay attapulgite, 2-8 parts of brucite nanofibers, 1-4 parts of lithium oxide aerosol, 2-8 parts of expanded vermiculite, 3-12 parts of vitrified microspheres, 2-4 parts of polypropylene fibers, and 1-4 parts of carbon fibers by weight. In the present invention, the heat-insulating material filled between the inner wall of the heat-conducting cylinder and the outer wall of the hot runner outer shell has a long-term heat-insulating effect, further improving the melting time of the molten plastic.

[0052] Embodiment 2:

[0053] A hot runner heating device for mold injection, comprising a hot runner outer shell 1, a heating sleeve 2 and a heat conducting sleeve 3;

[0054] The hot runner outer shell 1 is connected to the mold injection molding machine;

[0055] The heat-conducting tube 3 is sleeved on the outside of the hot runner outer shell 1, and the space between the inner wall of the heat-conducting tube 3 and the outer wall of the hot runner outer shell 1 is filled with a heat-insulating material 12;

[0056] The heating sleeve 2 is sleeved on the outside of the heat-conducting tube 3, and a heat-conducting chamber 13 is formed between the inner wall of the heating sleeve 2 and the outer wall of the heat-conducting tube 3;

[0057] A heat conducting fin assembly 14 is installed in the heat conducting chamber 13 .

[0058] In the present invention, a heating component is also installed on the inner side of the heating sleeve 2, and the heating component includes a first heating coil 4 and a second heating coil 5. The lower end of the first heating coil 4 is fixedly connected to the lower end of the second heating coil 5 through a first connecting piece 6, and a second connecting piece 7 is fixedly installed on the front side of the upper end of the second heating coil 5. The second heating coil 5 is fixedly connected to the upper end of the first heating coil 4 adjacent to the right side through the second connecting piece 7, and a fixing component is fixedly installed between the first heating coil 4 and the second heating coil 5; the fixing component includes a connecting block 8 and a hinge 10, and the connecting block 8 is sleeved on the first coil 4, and a rubber sleeve 9 is fixedly installed on the inner wall of the connecting block 8, and the hinge 10 is fixedly installed on the right side of the left connecting block 8, and the right side of the hinge 10 is fixedly connected to the left side of the right connecting block 8 through a telescopic rod 11. In the present invention, the heating assembly installed on the inner side of the heating sleeve can achieve the purpose of uniform heating. In addition, the distance between the first coil and the second coil can be adjusted by controlling the telescopic rod, thereby adjusting the overall length of the electromagnetic heating coil, thereby achieving the purpose of adjusting the heating area and further improving the heating uniformity.

[0059] In the present invention, the heat-conducting fin assembly 14 includes an upper heat-conducting fin 15, a lower heat-conducting fin 16, a first heat-conducting fin group and a second heat-conducting fin group, wherein the first heat-conducting fin group and the second heat-conducting fin group are installed between the upper heat-conducting fin 15 and the lower heat-conducting fin 16, the first heat-conducting fin group adopts a plurality of positive U-shaped fins 17, and the second heat-conducting fin group adopts a plurality of inverted U-shaped fins 18, wherein the positive U-shaped fins 17 and the inverted U-shaped fins 18 are arranged crosswise and at intervals, the upper heat-conducting fin 15 is welded to the inner wall of the heating sleeve 2, and the lower heat-conducting fin 16 is welded to the outer wall of the heat-conducting tube 3. The heat-conducting fin assembly adopted in the present invention can evenly conduct the heat generated by the heating coil to the heat-conducting tube, and the U-shaped fins arranged at staggered intervals can increase the heat conduction area and uniformity.

[0060] In the present invention, the heat-insulating material components include 40-60 parts of expandable polypropylene, 12-28 parts of ethylene-vinyl acetate copolymer, 5-15 parts of high-clay attapulgite, 2-8 parts of brucite nanofibers, 1-4 parts of lithium oxide aerosol, 2-8 parts of expanded vermiculite, 3-12 parts of vitrified microspheres, 2-4 parts of polypropylene fibers, and 1-4 parts of carbon fibers by weight. In the present invention, the heat-insulating material filled between the inner wall of the heat-conducting cylinder and the outer wall of the hot runner shell has a long-term heat-insulating effect, further improving the melting time of the molten plastic.

[0061] like Figure 5 As shown, in this embodiment, the heating sleeve 2 includes an upper heating tube 19 and a lower heating tube 20, the cross-sections of the upper heating tube 19 and the lower heating tube 20 are both semicircular structures, the upper heating tube 19 and the lower heating tube 20 are spliced ​​into one body, and the upper heating tube 19 and the lower heating tube 20 are fixed by a hoop assembly; the hoop assembly includes an upper hoop 21 and a lower hoop 22, the upper hoop 21 and the lower hoop 22 are both semicircular structures, a first flange 23 is arranged at both ends of the upper hoop 21, and a second flange 24 is arranged at both ends of the lower hoop 22, and bolt mounting holes are provided on the first flange 23 and the second flange 24, and a locking adjustment bolt 25 is installed in the bolt mounting hole. In the present invention, the upper heating tube and the lower heating tube are spliced ​​into one body, and the upper heating tube and the lower heating tube are fixed by a hoop assembly. With this structure, the disassembly and assembly and later maintenance of the heating tube are convenient, and the use cost is reduced.

[0062] Working principle: A method for using a hot runner heating device for mold injection molding comprises the following steps:

[0063] A. First, install the upper heating tube and the lower heating tube on the outer wall of the heat-conducting tube, and lock and fix them with the hoop assembly;

[0064] B. Control the first heating coil and the second heating coil to heat. The heat generated by the heating is transferred to the heat-conducting tube through the heat-conducting fin assembly. During the heating process, the distance between the first coil and the second coil is adjusted by controlling the telescopic rod, and the overall length of the electromagnetic heating coil is adjusted, thereby adjusting the heating area;

[0065] C. The heat transfer tube transfers the heat evenly to the hot runner outer shell, and the hot runner outer shell transfers the heat to the molten plastic inside;

[0066] D. The insulation material insulates the molten plastic to keep it in a molten state.

[0067] In summary, the present invention has a novel structural design, can achieve rapid and uniform heating of the hot runner outer shell, and can achieve long-term heat preservation after heating, ensuring that the plastic in the hot runner of the mold injection molding machine remains in a molten state, thereby improving the mold processing quality.

[0068] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hot runner heating device for mold injection, characterized in that: It comprises a hot runner outer shell (1), a heating sleeve (2) and a heat-conducting sleeve (3); The hot runner outer shell (1) is connected to a mold injection molding machine; The heat-conducting tube (3) is sleeved on the outside of the hot runner outer shell (1), and a heat-insulating material (12) is filled between the inner wall of the heat-conducting tube (3) and the outer wall of the hot runner outer shell (1); The heating sleeve (2) is sleeved on the outside of the heat-conducting tube (3), and a heat-conducting chamber (13) is formed between the inner wall of the heating sleeve (2) and the outer wall of the heat-conducting tube (3); A heat-conducting fin assembly (14) is installed in the heat-conducting chamber (13).

2. A hot runner heating device for mold injection molding according to claim 1, characterized in that: A heating component is also installed inside the heating sleeve (2), and the heating component includes a first heating coil (4) and a second heating coil (5). The lower end of the first heating coil (4) is fixedly connected to the lower end of the second heating coil (5) via a first connecting piece (6), and a second connecting piece (7) is fixedly installed on the front side of the upper end of the second heating coil (5). The second heating coil (5) is fixedly connected to the upper end of the first heating coil (4) adjacent to the right side via the second connecting piece (7), and a fixing component is fixedly installed between the first heating coil (4) and the second heating coil (5).

3. A hot runner heating device for mold injection molding according to claim 2, characterized in that: The fixing assembly comprises a connecting block (8) and a hinge (10); the connecting block (8) is sleeved on the first coil (4); a rubber sleeve (9) is fixedly mounted on the inner wall of the connecting block (8); the hinge (10) is fixedly mounted on the right side of the left connecting block (8); the right side of the hinge (10) is fixedly connected to the left side of the right connecting block (8) via a telescopic rod (11).

4. A hot runner heating device for mold injection molding according to claim 1, characterized in that: The heat-conducting fin assembly (14) comprises an upper heat-conducting fin (15), a lower heat-conducting fin (16), a first heat-conducting fin group and a second heat-conducting fin group. The first heat-conducting fin group and the second heat-conducting fin group are installed between the upper heat-conducting fin (15) and the lower heat-conducting fin (16). The first heat-conducting fin group adopts a plurality of positive U-shaped fins (17), and the second heat-conducting fin group adopts a plurality of inverted U-shaped fins (18). The positive U-shaped fins (17) and the inverted U-shaped fins (18) are arranged in a cross-spaced manner. The upper heat-conducting fin (15) is welded to the inner wall of the heating sleeve (2), and the lower heat-conducting fin (16) is welded to the outer wall of the heat-conducting sleeve (3).

5. A hot runner heating device for mold injection molding according to claim 1, characterized in that: The thermal insulation material components include, by weight, 40-60 parts of expandable polypropylene, 12-28 parts of ethylene-vinyl acetate copolymer, 5-15 parts of high-clay attapulgite, 2-8 parts of brucite nanofibers, 1-4 parts of lithium oxide aerosol, 2-8 parts of expanded vermiculite, 3-12 parts of glass microspheres, 2-4 parts of polypropylene fibers, and 1-4 parts of carbon fibers.

6. A hot runner heating device for mold injection molding according to claim 1, characterized in that: The heating sleeve (2) comprises an upper heating sleeve (19) and a lower heating sleeve (20), the cross-sections of the upper heating sleeve (19) and the lower heating sleeve (20) are both semicircular structures, the upper heating sleeve (19) and the lower heating sleeve (20) are spliced ​​into one body, and the upper heating sleeve (19) and the lower heating sleeve (20) are fixed by a hoop assembly.

7. A hot runner heating device for mold injection molding according to claim 6, characterized in that: The hoop assembly comprises an upper hoop (21) and a lower hoop (22); the upper hoop (21) and the lower hoop (22) are both semicircular structures; first convex edges (23) are arranged at both ends of the upper hoop (21); second convex edges (24) are arranged at both ends of the lower hoop (22); bolt mounting holes are provided on the first convex edge (23) and the second convex edge (24); locking adjustment bolts (25) are installed in the bolt mounting holes.

8. A method for using the hot runner heating device for mold injection molding according to claim 1, characterized in that: The method of use includes the following steps: A. First, install the upper heating tube and the lower heating tube on the outer wall of the heat-conducting tube, and lock and fix them with the hoop assembly; B. Control the first heating coil and the second heating coil to heat. The heat generated by the heating is transferred to the heat-conducting tube through the heat-conducting fin assembly. During the heating process, the distance between the first coil and the second coil is adjusted by controlling the telescopic rod, and the overall length of the electromagnetic heating coil is adjusted, thereby adjusting the heating area; C. The heat transfer tube transfers the heat evenly to the hot runner outer shell, and the hot runner outer shell transfers the heat to the molten plastic inside; D. The insulation material insulates the molten plastic to keep it in a molten state.

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