A heating device for injection molding machine

Abstract

The utility model discloses a heating device for an injection molding machine, which relates to the technical field of injection molding machines and comprises a heating body, an upper buckling component, a lower buckling component and a heating component, wherein the upper buckling component is detachably connected to the top of the heating body, and the lower buckling component is detachably connected to the bottom of the heating component; the heating component comprises a plurality of electric heating tubes, the tops of the electric heating tubes are provided with joints, and the electric heating tubes are detachably connected to the upper buckling component through the joints; a heating cavity which is arranged to cooperate with the electric heating tube is arranged on the heating body, and when the upper buckling component is buckled with the heating body, the bottom of the electric heating tube can be inserted into the heating cavity and cooperate with the gap of the heating cavity, thereby solving the problem that the heating coil of the current one-piece structure is difficult to replace and takes a long time to replace when the heating tube needs to be replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a heating device used for injection molding machines. Background Art

[0002] Injection molding machine is a kind of equipment widely used in the plastic processing industry. It is mainly used to inject molten plastic into the mold, so that it can be quickly solidified and formed into various plastic products. Injection molding machine is usually composed of injection device, mold clamping device, hydraulic system, control system and other parts. The whole injection molding process includes heating and melting plastic particles, injecting them into the mold, cooling and molding, opening the mold and discharging them. Injection molding machine has the advantages of high production efficiency, low production cost and high product precision. It is widely used in electronic products, auto parts, daily necessities, toys and other fields.

[0003] In the prior art, plastics are generally heated by a heating coil in an injection molding machine. However, most current heating coils are integrated structures, that is, multiple heating tubes are integrated into one structure. Since the integrated heating coil structure is not easy to disassemble, when the heating tube needs to be replaced, there are problems such as high difficulty and long replacement time.

[0004] In the utility model with application number: CN201220437921.0 and publication number: CN202805579U, an energy-saving heating ring for an injection molding machine is disclosed, which includes two sub-rings of semicircular rings, and the two side ends of the sub-rings respectively form a first joint surface and a second joint surface. The first joint surface and the second joint surface are respectively joined to each other, and the inner arc side walls of the sub-rings are joined to each other to form a clamping area for clamping the gun barrel. A plurality of heating tubes are arranged on the inner side of the inner arc side walls of the sub-rings near the inner side. When the heating tubes need to be replaced, there are still problems of high replacement difficulty and long replacement time. Utility Model Content

[0005] Based on this, in order to solve the above problems, the utility model proposes a heating device for an injection molding machine, which solves the problem that the heating coil of the current one-piece structure is difficult to replace and takes a long time to replace when the heating tube needs to be replaced.

[0006] The technical solution of the utility model is:

[0007] A heating device for an injection molding machine, comprising a heating body, an upper buckle assembly, a lower buckle assembly and a heating assembly, wherein the upper buckle assembly is detachably connected to the top of the heating body, and the lower buckle assembly is detachably connected to the bottom of the heating assembly;

[0008] The heating component includes a plurality of electric heating tubes, and a joint portion is provided on the top of the electric heating tubes, and the electric heating tubes are detachably connected to the upper buckle assembly through the joint portion;

[0009] A heating cavity is provided on the heating body and is matched with the electric heating tube. When the upper buckle assembly is buckled with the heating body, the bottom of the electric heating tube can be inserted into the heating cavity and matched with the gap of the heating cavity.

[0010] Preferably, the heating body includes a thermal insulation layer, a flame retardant layer, an installation layer, a heat insulation layer and a protective layer arranged in sequence from the inside to the outside, the heating cavity is arranged on the installation layer, and the heating cavity is connected to the flame retardant layer, and the heating cavity passes through the installation layer from top to bottom.

[0011] Preferably, the upper snap-fit ​​assembly includes an upper snap-fit ​​disk, an upper protective ring plate and an upper thermal insulation ring plate. An installation cavity is provided at the bottom of the upper snap-fit ​​disk. The upper protective ring plate and the upper thermal insulation ring plate are arranged in the installation cavity, and the upper thermal insulation ring plate is located between the upper protective ring plate and the upper snap-fit ​​disk. When the upper snap-fit ​​disk is snapped with the heating body, the upper protective ring plate contacts the top of the installation layer.

[0012] Preferably, an upper through opening is provided in the middle of the upper buckle disk, the upper protective ring plate and the upper insulation ring plate, which is coordinated with the thermal insulation layer and the flame retardant layer. The top of the thermal insulation layer and the flame retardant layer extends into the upper through opening, and the flame retardant layer is slidably coordinated with the upper buckle disk, the upper protective ring plate and the upper insulation ring plate.

[0013] Preferably, a first fixing ring is provided at the upper end of the protective layer, and the first fixing ring is detachably connected to the upper buckling plate by bolts.

[0014] Preferably, the lower buckling assembly includes a lower buckling disk, a lower protective ring plate and a lower thermal insulation ring plate, the lower thermal insulation ring plate is arranged on the lower buckling disk, and the lower protective ring plate is arranged on the lower thermal insulation ring plate.

[0015] Preferably, there is a accommodating cavity between the flame retardant layer and the thermal insulation layer of the heating body, and the accommodating cavity is arranged at the bottom of the mounting layer. When the lower snap-fitting plate is snapped with the heating body, the lower thermal insulation ring plate and the lower protective ring plate can be inserted into the accommodating cavity, and the lower protective ring plate contacts the bottom of the mounting layer, and the lower snap-fitting plate contacts the bottom of the thermal insulation layer.

[0016] Preferably, a lower through opening is provided in the middle of the lower buckle plate, the lower protective ring plate and the lower insulation ring plate, which is coordinated with the thermal insulation layer and the flame retardant layer. The top of the thermal insulation layer and the flame retardant layer extends into the lower through opening, and the flame retardant layer is slidably coordinated with the lower buckle plate, the lower protective ring plate and the lower insulation ring plate.

[0017] Preferably, a second fixing ring is provided at the lower end of the protective layer, and the second fixing ring is detachably connected to the lower buckle plate by bolts.

[0018] Preferably, the upper end of the joint part passes through the upper protective ring plate, the upper thermal insulation ring plate and the upper buckle plate, and is slidably matched with the upper protective ring plate, the upper thermal insulation ring plate and the upper buckle plate. The lower end of the joint part is provided with a third fixing ring that is matched with the upper protective ring plate. The third fixing ring is detachably connected to the upper protective ring plate by bolts.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The utility model realizes a split structure of the heating coil by arranging the heating coil as a heating body, an upper buckle assembly, a lower buckle assembly and a heating assembly; the upper buckle assembly is detachably connected to the top of the heating body, thereby realizing the detachability of the upper buckle assembly; the lower buckle assembly is detachably connected to the bottom of the heating assembly, thereby realizing the detachability of the lower buckle assembly; the heating assembly is arranged as a plurality of electric heating tubes, and a joint is arranged on the top of the electric heating tube, and the electric heating tube is detachably connected to the upper buckle assembly through the joint, thereby realizing the detachability of the electric heating tube and the upper buckle assembly; a heating cavity is arranged on the heating body, so that the electric heating tube can be inserted into the heating cavity and matched with the gap of the heating cavity, thereby realizing the detachability of the electric heating tube.

[0021] During use, when the electric heating tube needs to be replaced, the upper buckle assembly is removed from the heating body, the electric heating tube is taken out of the heating cavity through the upper buckle assembly, and then the electric heating tube to be replaced is removed from the upper buckle assembly, replaced with a new electric heating tube, and then the electric heating tube is inserted into the corresponding heating cavity, and the upper buckle assembly is buckled with the heating body to complete the replacement of the electric heating tube.

[0022] The invention solves the problem that the heating coil of the current integrated structure is difficult to replace and takes a long time to replace when the heating tube needs to be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the explosion structure of a heating device for an injection molding machine described in an embodiment of the utility model;

[0024] Figure 2 It is a structural schematic diagram of a heating device for an injection molding machine described in an embodiment of the utility model;

[0025] Figure 3 The structure diagram of the upper buckle assembly and the heating assembly described in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0026] Figure 4 The structure diagram of the upper buckle assembly and the heating assembly described in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0027] Figure 5 It is a structural schematic diagram of the heating body described in the embodiment of the utility model;

[0028] Figure 6 It is a structural schematic diagram of the lower buckle assembly described in the embodiment of the utility model;

[0029] Figure 7It is a schematic cross-sectional structure diagram of a heating device for an injection molding machine described in an embodiment of the utility model;

[0030] Figure 8 It is described in the embodiment of the utility model Figure 7 A schematic diagram of the local enlarged structure at point A in the middle;

[0031] Description of reference numerals:

[0032] 10-heating body, 100-heating cavity, 101-insulation layer, 102-flame retardant layer, 103-installation layer, 104-insulation layer, 105-protective layer, 106-first fixing ring, 107-accommodating cavity, 108-second fixing ring, 20-upper buckling assembly, 200-upper buckling disk, 201-upper protection ring plate, 202-upper insulation ring plate, 203-installation cavity, 204-upper through port, 30-lower buckling assembly, 300-lower buckling disk, 301-lower protection ring plate, 302-lower insulation ring plate, 303-lower through port, 40-heating assembly, 400-electric heating tube, 401-joint part, 402-third fixing ring. DETAILED DESCRIPTION

[0033] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0034] Example:

[0035] like Figure 1 , Figure 2 , Figure 4 , Figure 7 As shown, in order to solve the above problems, this embodiment discloses a heating device for an injection molding machine, including a heating body 10, an upper buckle assembly 20, a lower buckle assembly 30 and a heating assembly 40, wherein the upper buckle assembly 20 is detachably connected to the top of the heating body 10, and the lower buckle assembly 30 is detachably connected to the bottom of the heating assembly 40;

[0036] The heating component 40 includes a plurality of electric heating tubes 400 , and a joint portion 401 is provided on the top of the electric heating tube 400 . The electric heating tube 400 is detachably connected to the upper buckle component 20 through the joint portion 401 .

[0037] The heating body 10 is provided with a heating cavity 100 which is arranged in cooperation with the electric heating tube 400 . When the upper buckle assembly 20 is buckled with the heating body 10 , the bottom of the electric heating tube 400 can be inserted into the heating cavity 100 and fit with the gap of the heating cavity 100 .

[0038] The utility model realizes a split structure of the heating coil by arranging the heating coil as a heating body 10, an upper buckle assembly 20, a lower buckle assembly 30 and a heating assembly 40; the upper buckle assembly 20 is detachably connected to the top of the heating body 10, thereby realizing the detachability of the upper buckle assembly 20; the lower buckle assembly 30 is detachably connected to the bottom of the heating assembly 40, thereby realizing the detachability of the lower buckle assembly 30; the heating assembly 40 is arranged as a plurality of electric heating tubes 400, and a joint part 401 is arranged on the top of the electric heating tube 400, and the electric heating tube 400 is detachably connected to the upper buckle assembly 20 through the joint part 401, thereby realizing the detachability of the electric heating tube 400 and the upper buckle assembly 20; a heating cavity 100 is arranged on the heating body 10, so that the electric heating tube 400 can be inserted into the heating cavity 100 and fit with the gap of the heating cavity 100, thereby realizing the detachability of the electric heating tube 400.

[0039] During use, when the electric heating tube 400 needs to be replaced, the upper snap-fit ​​assembly 20 is removed from the heating body 10, and the electric heating tube 400 is taken out of the heating cavity 100 through the upper snap-fit ​​assembly 20, and then the electric heating tube 400 that needs to be replaced is removed from the upper snap-fit ​​assembly 20, and replaced with a new electric heating tube 400, and then the electric heating tube 400 is inserted into the corresponding heating cavity 100, and the upper snap-fit ​​assembly 20 is snapped with the heating body 10 to complete the replacement of the electric heating tube 400.

[0040] The invention solves the problem that the heating coil of the current integrated structure is difficult to replace and takes a long time to replace when the heating tube needs to be replaced.

[0041] The electric heating tube 400 can be an electric heating tube in the prior art that can realize the function of the utility model. The structure of the electric heating tube 400 should at least include a tube body and a heating wire arranged in the tube body.

[0042] like Figure 5 As shown, in order to make the heating body 10 have more excellent thermal insulation performance, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment is that the heating body 10 includes a thermal insulation layer 101, a flame retardant layer 102, a mounting layer 103, a heat insulation layer 104 and a protective layer 105 arranged in sequence from the inside to the outside, and the heating cavity 100 is arranged on the mounting layer 103, and the heating cavity 100 is connected with the flame retardant layer 102, and the heating cavity 100 passes through the mounting layer 103 from top to bottom.

[0043] The thermal insulation layer 101 is a tubular structure for thermal insulation, the flame retardant layer 102 is for flame retardancy, the installation layer 103 is for heat conduction and installation of the electric heating tube 400 , the thermal insulation layer 104 is for reducing heat transfer to the protective layer 105 , and the protective layer 105 is for protecting the heating body 10 .

[0044] The insulation layer 101 may be made of insulation materials in the prior art, such as glass fiber wool.

[0045] The flame retardant layer 102 may be made of flame retardant materials in the prior art, such as rock wool board and stainless steel.

[0046] The mounting layer 103 may be made of heat-conducting materials in the prior art, such as stainless steel.

[0047] The heat insulation layer 104 may be made of heat insulation materials in the prior art, such as glass fiber wool and rock wool board.

[0048] The protective layer 105 may be made of insulating materials in the prior art, such as high temperature resistant rubber.

[0049] like Figure 3 , Figure 4 As shown, in order to reduce the heat loss from the upper buckling component 20 and facilitate the disassembly and assembly between the upper buckling component 20 and the heating body 10, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment is that the upper buckling component 20 includes an upper buckling disk 200, an upper protective ring plate 201 and an upper thermal insulation ring plate 202. The upper buckling disk 200 has an installation cavity 203 at the bottom. The upper protective ring plate 201 and the upper thermal insulation ring plate 202 are arranged in the installation cavity 203, and the upper thermal insulation ring plate 202 is located between the upper protective ring plate 201 and the upper buckling disk 200. When the upper buckling disk 200 is buckled with the heating body 10, the upper protective ring plate 201 is in contact with the top of the installation layer 103.

[0050] Preferably, an upper through opening 204 is provided in the middle of the upper buckling disk 200, the upper protective ring plate 201 and the upper thermal insulation ring plate 202, which is coordinated with the thermal insulation layer 101 and the flame retardant layer 102, the top of the thermal insulation layer 101 and the flame retardant layer 102 extends into the upper through opening 204, and the flame retardant layer 102 is slidably coordinated with the upper buckling disk 200, the upper protective ring plate 201 and the upper thermal insulation ring plate 202.

[0051] When in use, the upper protective ring plate 201 is used for flame retardancy and can be made of stainless steel. The upper thermal insulation ring plate 202 is used for heat insulation and can be made of rock wool board. The tops of the thermal insulation layer 101 and the flame retardant layer 102 extend into the upper through opening 204 and cooperate with the upper buckle disk 200, the upper protective ring plate 201 and the upper thermal insulation ring plate 202, which can effectively reduce heat loss from the upper buckle assembly 20.

[0052] Preferably, a first fixing ring 106 is provided at the upper end of the protective layer 105 , and the first fixing ring 106 is detachably connected to the upper buckling plate 200 via bolts.

[0053] When in use, the upper buckling plate 200 and the first fixing ring 106 can be quickly disassembled and assembled by means of bolts through the detachable connection, thereby facilitating the disassembly and assembly of the upper buckling assembly 20 .

[0054] like Figure 6 As shown, in order to reduce the loss of heat from the lower buckling component 30 and facilitate the disassembly and assembly between the lower buckling component 30 and the heat generating body 10, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment is that the lower buckling component 30 includes a lower buckling disk 300, a lower protective ring plate 301 and a lower thermal insulation ring plate 302, the lower thermal insulation ring plate 302 is arranged on the lower buckling disk 300, and the lower protective ring plate 301 is arranged on the lower thermal insulation ring plate 302.

[0055] like Figure 7 , Figure 8 As shown, preferably, there is a accommodating cavity 107 between the flame retardant layer 102 and the thermal insulation layer 104 of the heating body 10, and the accommodating cavity 107 is arranged at the bottom of the mounting layer 103. When the lower snap-fitting disk 300 is snapped with the heating body 10, the lower thermal insulation ring plate 302 and the lower protective ring plate 301 can be inserted into the accommodating cavity 107, the lower protective ring plate 301 contacts the bottom of the mounting layer 103, and the lower snap-fitting disk 300 contacts the bottom of the thermal insulation layer 104.

[0056] Preferably, a lower opening 303 is provided in the middle of the lower buckle plate 300, the lower protective ring plate 301 and the lower thermal insulation ring plate 302, which is coordinated with the thermal insulation layer 101 and the flame retardant layer 102, the top of the thermal insulation layer 101 and the flame retardant layer 102 extends into the lower opening 303, and the flame retardant layer 102 is slidably matched with the lower buckle plate 300, the lower protective ring plate 301 and the lower thermal insulation ring plate 302.

[0057] When in use, the lower protective ring plate 301 is used for flame retardancy and can be made of stainless steel. The lower thermal insulation ring plate 302 is used for heat insulation and heat preservation and can be made of rock wool board. The bottom of the thermal insulation layer 101 and the flame retardant layer 102 extend into the lower through opening 303 and cooperate with the lower buckle disk 300, the lower protective ring plate 301 and the lower thermal insulation ring plate 302. At the same time, the lower thermal insulation ring plate 302 and the lower protective ring plate 301 are inserted into the accommodating cavity 107, the lower protective ring plate 301 contacts the bottom of the mounting layer 103, and the lower buckle disk 300 contacts the bottom of the thermal insulation layer 104, which can effectively reduce the heat loss from the lower buckle assembly 30.

[0058] like Figure 5 As shown, preferably, a second fixing ring 108 is provided at the lower end of the protective layer 105, and the second fixing ring 108 is detachably connected to the lower buckle plate 300 by bolts.

[0059] When in use, the lower buckling plate 300 and the second fixing ring 108 can be quickly disassembled and assembled by means of bolts through the detachable connection, thereby facilitating the disassembly and assembly of the lower buckling assembly 30 .

[0060] like Figure 4 As shown, in order to facilitate the disassembly and assembly between the electric heating tube 400 and the upper buckling assembly 20, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment lies in that the upper end of the joint part 401 passes through the upper protective ring plate 201, the upper thermal insulation ring plate 202 and the upper buckling disk 200, and is slidably matched with the upper protective ring plate 201, the upper thermal insulation ring plate 202 and the upper buckling disk 200, and the lower end of the joint part 401 is provided with a third fixing ring 402 which is arranged in cooperation with the upper protective ring plate 201, and the third fixing ring 402 is detachably connected to the upper protective ring plate 201 by bolts.

[0061] When in use, insert the upper end of the joint part 401 into the upper protective ring plate 201, the upper thermal insulation ring plate 202 and the upper buckling disk 200, so that it extends out of the upper buckling disk 200, and then detachably connect the third fixing ring 402 and the upper protective ring plate 201 by bolts, so that the joint part 401 can be fixed and the electric heating tube 400 can be installed. When replacement is needed, it is only necessary to remove the bolts, and the electric heating tube 400 and the joint part 401 can be pulled out from the protective ring plate, the upper thermal insulation ring plate 202 and the upper buckling disk 200 to complete the replacement of the electric heating tube 400.

[0062] Working principle of this utility model:

[0063] The utility model realizes a split structure of the heating coil by arranging the heating coil as a heating body 10, an upper buckle assembly 20, a lower buckle assembly 30 and a heating assembly 40; the upper buckle assembly 20 is detachably connected to the top of the heating body 10, thereby realizing the detachability of the upper buckle assembly 20; the lower buckle assembly 30 is detachably connected to the bottom of the heating assembly 40, thereby realizing the detachability of the lower buckle assembly 30; the heating assembly 40 is arranged as a plurality of electric heating tubes 400, and a joint part 401 is arranged on the top of the electric heating tube 400, and the electric heating tube 400 is detachably connected to the upper buckle assembly 20 through the joint part 401, thereby realizing the detachability of the electric heating tube 400 and the upper buckle assembly 20; a heating cavity 100 is arranged on the heating body 10, so that the electric heating tube 400 can be inserted into the heating cavity 100 and fit with the gap of the heating cavity 100, thereby realizing the detachability of the electric heating tube 400. During use, when the electric heating tube 400 needs to be replaced, the upper snap-fit ​​assembly 20 is removed from the heating body 10, and the electric heating tube 400 is taken out of the heating cavity 100 through the upper snap-fit ​​assembly 20, and then the electric heating tube 400 that needs to be replaced is removed from the upper snap-fit ​​assembly 20, and replaced with a new electric heating tube 400, and then the electric heating tube 400 is inserted into the corresponding heating cavity 100, and the upper snap-fit ​​assembly 20 is snapped with the heating body 10 to complete the replacement of the electric heating tube 400.

[0064] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A heating device for an injection molding machine, characterized in that: It comprises a heating body (10), an upper buckle assembly (20), a lower buckle assembly (30) and a heating assembly (40), wherein the upper buckle assembly (20) is detachably connected to the top of the heating body (10), and the lower buckle assembly (30) is detachably connected to the bottom of the heating assembly (40); The heating component (40) comprises a plurality of electric heating tubes (400), and a joint portion (401) is provided on the top of the electric heating tubes (400). The electric heating tubes (400) are detachably connected to the upper buckle component (20) via the joint portion (401); A heating cavity (100) is provided on the heating body (10) and is arranged in cooperation with the electric heating tube (400); when the upper buckle assembly (20) is buckled with the heating body (10), the bottom of the electric heating tube (400) can be inserted into the heating cavity (100) and is gap-matched with the heating cavity (100).

2. A heating device for an injection molding machine according to claim 1, characterized in that: The heating body (10) comprises a heat preservation layer (101), a flame retardant layer (102), a mounting layer (103), a heat insulating layer (104) and a protective layer (105) which are arranged in sequence from the inside to the outside; the heating chamber (100) is arranged on the mounting layer (103), the heating chamber (100) is connected to the flame retardant layer (102), and the heating chamber (100) passes through the mounting layer (103) from top to bottom.

3. A heating device for an injection molding machine according to claim 2, characterized in that: The upper buckling assembly (20) comprises an upper buckling disk (200), an upper protective ring plate (201) and an upper heat-insulating ring plate (202); a mounting cavity (203) is provided at the bottom of the upper buckling disk (200); the upper protective ring plate (201) and the upper heat-insulating ring plate (202) are arranged in the mounting cavity (203); and the upper heat-insulating ring plate (202) is located between the upper protective ring plate (201) and the upper buckling disk (200); when the upper buckling disk (200) is buckled with the heating body (10), the upper protective ring plate (201) contacts the top of the mounting layer (103).

4. A heating device for an injection molding machine according to claim 3, characterized in that: An upper through opening (204) is provided in the middle of the upper buckle plate (200), the upper protective ring plate (201) and the upper heat-insulating ring plate (202) and is arranged in cooperation with the heat-insulating layer (101) and the flame-retardant layer (102); the tops of the heat-insulating layer (101) and the flame-retardant layer (102) extend into the upper through opening (204), and the flame-retardant layer (102) is slidably matched with the upper buckle plate (200), the upper protective ring plate (201) and the upper heat-insulating ring plate (202).

5. A heating device for an injection molding machine according to claim 4, characterized in that: A first fixing ring (106) is provided at the upper end of the protective layer (105), and the first fixing ring (106) is detachably connected to the upper buckling plate (200) via bolts.

6. A heating device for an injection molding machine according to claim 2 or 5, characterized in that: The lower buckling assembly (30) comprises a lower buckling plate (300), a lower protective ring plate (301) and a lower thermal insulation ring plate (302); the lower thermal insulation ring plate (302) is arranged on the lower buckling plate (300), and the lower protective ring plate (301) is arranged on the lower thermal insulation ring plate (302).

7. A heating device for an injection molding machine according to claim 6, characterized in that: A receiving cavity (107) is provided between the flame retardant layer (102) and the heat insulation layer (104) of the heating body (10); the receiving cavity (107) is arranged at the bottom of the mounting layer (103); when the lower snap-fitting plate (300) is snap-fitted with the heating body (10), the lower heat insulation ring plate (302) and the lower protective ring plate (301) can be inserted into the receiving cavity (107); the lower protective ring plate (301) contacts the bottom of the mounting layer (103); and the lower snap-fitting plate (300) contacts the bottom of the heat insulation layer (104).

8. A heating device for an injection molding machine according to claim 7, characterized in that: A lower opening (303) is provided in the middle of the lower buckle plate (300), the lower protective ring plate (301) and the lower heat-insulating ring plate (302) and is arranged in cooperation with the heat-insulating layer (101) and the flame-retardant layer (102); the tops of the heat-insulating layer (101) and the flame-retardant layer (102) extend into the lower opening (303), and the flame-retardant layer (102) is slidably matched with the lower buckle plate (300), the lower protective ring plate (301) and the lower heat-insulating ring plate (302).

9. A heating device for an injection molding machine according to claim 8, characterized in that: A second fixing ring (108) is provided at the lower end of the protective layer (105), and the second fixing ring (108) is detachably connected to the lower buckle plate (300) via bolts.

10. A heating device for an injection molding machine according to claim 5, characterized in that: The upper end of the joint part (401) passes through the upper protective ring plate (201), the upper heat insulation ring plate (202) and the upper buckle plate (200), and is slidably matched with the upper protective ring plate (201), the upper heat insulation ring plate (202) and the upper buckle plate (200); the lower end of the joint part (401) is provided with a third fixing ring (402) matched with the upper protective ring plate (201); the third fixing ring (402) and the upper protective ring plate (201) are detachably connected by bolts.

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