Injection mold for a composite outer cover of an electrical box

Abstract

The utility model relates to a kind of injection mould of electric appliance box composite outer cover, including the dynamic mould and fixed mould mutually buckled.The injection mould provided by the utility model places the steel shell of stamping forming in the cavity of injection mould, and plastic lining is directly injection molded in the inner surface of steel shell, makes plastic lining and steel shell firmly connect together through coupling hole in forming process, forms electric appliance box composite outer cover.The injection mould provided by the utility model solves the fixing and positioning problem of steel shell in the cavity of injection mould by electromagnet and positioning column, and adopts glue sealing column structure, realizes the plugging of the reverse coupling hole on steel shell, and plays the role of preventing leakage and glue running.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold for a composite outer cover of an electrical box. Background Technology

[0002] The outer cover of the electrical box is the outer cover of the electrical box on electrical equipment, which protects the circuit boards, electrical components, cables and other components installed inside the electrical box.

[0003] The composite structure of the electrical box cover is made of a steel outer shell and a plastic inner liner. It combines the excellent structural strength, weather resistance, and fire resistance of the steel outer shell with the plastic inner liner to meet new industry electrical standards for insulation. The composite cover effectively solves the functional problems of traditional plastic and metal covers. However, due to the influence of workpiece structure, size, material molding performance, and the connection method between the cover and the inner liner, injection molding is quite difficult, requiring optimization and improvement of injection molds and processes. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an injection mold for a composite outer cover of an electrical box, addressing the above-mentioned shortcomings.

[0005] This utility model is achieved through the following technical solution:

[0006] An injection mold for a composite outer cover of an electrical box includes a movable mold and a fixed mold that interlock with each other; the movable mold includes a movable mold plate, a movable mold core, a movable mold ejector assembly, and a movable mold support assembly; the movable mold core is disposed within the movable mold plate and has a first cavity for accommodating the composite outer cover of the electrical box; the movable mold plate is fixed to the movable mold support assembly; the movable mold ejector assembly is disposed on the movable mold support assembly and slides through the movable mold plate and the movable mold core to eject the composite outer cover of the electrical box;

[0007] The fixed mold includes a fixed mold plate, a fixed mold core, a fixed mold support assembly, and a hot runner. The fixed mold core is disposed within the fixed mold plate and has a second cavity covering the composite outer cover of the electrical box. The fixed mold plate is fixed to the fixed mold support assembly. The hot runner passes through the fixed mold support assembly, the fixed mold plate, and the fixed mold core, connecting to the second cavity between the composite outer cover of the electrical box.

[0008] Furthermore, in the injection mold for the composite outer cover of the electrical box, the moving mold core includes one side and another side opposite to the first side. The first side is embedded with an outer shell cavity having the first cavity, and the other side is provided with a plurality of electromagnetic cavities. Electromagnets are installed in the electromagnetic cavities, and the other side is embedded in the moving mold plate.

[0009] Furthermore, in the injection mold for the composite outer cover of the electrical appliance box, the inner contour of the first cavity of the outer shell cavity matches the steel outer shell of the composite outer cover of the electrical appliance box.

[0010] Furthermore, in the injection mold for the composite outer cover of the electrical box, the periphery of the outer shell cavity is provided with a plurality of positioning posts corresponding to the mounting holes of the steel outer shell of the composite outer cover of the electrical box.

[0011] Furthermore, in the injection mold for the composite outer cover of the electrical box, the periphery of the outer shell cavity is provided with a plurality of sealing posts corresponding to the connection holes of the steel outer shell of the composite outer cover of the electrical box.

[0012] Furthermore, in the injection mold for the composite outer cover of the electrical box, the sealing post includes a convex guide hole formed in the moving mold core; the shape of the guide post matches the guide hole, is slightly movable and disposed in the guide hole, and has a portion extending out of the guide hole.

[0013] Furthermore, in the injection mold for the composite outer cover of the electrical box, the positioning post is provided with two opposing semi-annular ejector pin holes; the ejector pin of the moving mold ejector pin assembly is a cylindrical straight rod, the top of which is a semi-annular hollow tube structure corresponding to the semi-annular ejector pin hole, and the ejector pin slides through the semi-annular ejector pin hole to eject the composite outer cover of the electrical box.

[0014] Furthermore, in the injection mold for the composite outer cover of the electrical box, the fixed mold core is provided with an inner liner cavity having the second cavity, and the inner liner cavity is provided with a plurality of glue inlet points and vent plugs; the hot runner is connected to the glue inlet points.

[0015] Furthermore, in the injection mold for the composite outer cover of the electrical box, a plurality of auxiliary push rods are provided around the inner lining cavity; each auxiliary push rod includes a rod core, a rod sleeve, and a spring, the rod sleeve being embedded in the fixed mold plate; the spring is sleeved on the lower part of the rod core and disposed inside the rod sleeve, one end of which abuts against the bottom of the inner sleeve, and the other end abuts against the protrusion of the rod core; the upper part of the rod core penetrates through the fixed mold core and the inner lining cavity, and under the action of the spring, the protrusion of the rod core abuts against the fixed mold core.

[0016] Furthermore, in the injection mold for the composite outer cover of the electrical box, the electromagnet includes an iron core and a heat insulation component, wherein the heat insulation component includes a ceramic fiber gasket layer covering the iron core and a titanium alloy heat insulation layer covering the ceramic fiber gasket layer.

[0017] The advantages and effects of this utility model are:

[0018] The injection mold provided by this utility model places a stamped steel outer shell into the cavity of the injection mold, and directly injection molds a plastic liner onto the inner surface of the steel outer shell. During the molding process, the plastic liner and the steel outer shell are firmly connected together through connecting holes to form a composite outer cover for the electrical box. The injection mold provided by this utility model solves the problem of fixing and positioning the steel outer shell in the injection mold cavity through electromagnets and positioning posts, and adopts a sealing post structure to seal the undercut connecting holes on the steel outer shell, thereby preventing leakage and glue leakage. Attached Figure Description

[0019] Figure 1 This invention provides a schematic diagram of the overall structure of the injection mold.

[0020] Figure 2 This invention provides a schematic diagram of the moving mold structure of the injection mold.

[0021] Figure 3 This invention provides an exploded view of the moving mold structure of the injection mold.

[0022] Figure 4 This is a front view of the moving mold core of the injection mold provided by this utility model;

[0023] Figure 5 This diagram shows the back side of the moving mold core of the injection mold provided by this utility model;

[0024] Figure 6 This invention provides a schematic diagram of the structure of the electromagnet for an injection mold.

[0025] Figure 7 This invention provides a schematic diagram of the sealing column structure of the injection mold.

[0026] Figure 8 This diagram shows a cross-sectional view of the sealing column of the injection mold provided by this utility model;

[0027] Figure 9 This is a three-dimensional schematic diagram of the sealing column of the injection mold provided by this utility model;

[0028] Figure 10 This diagram shows the positioning pin and semi-annular ejector pin hole of the injection mold provided by this utility model;

[0029] Figure 11 A schematic diagram of the positioning pin and ejector pin of the injection mold provided by this utility model is shown;

[0030] Figure 12 A schematic diagram of the electromagnetic cavity and the outer shell cavity of the injection mold provided by this utility model is shown;

[0031] Figure 13 A schematic diagram of the ejector pin structure of the injection mold provided by this utility model is shown;

[0032] Figure 14 This invention provides a schematic diagram of the structure of the fixed mold of the injection mold.

[0033] Figure 15 This invention provides an exploded view of the structure of the fixed mold of the injection mold.

[0034] Figure 16 This is a front view of the fixed mold core of the injection mold provided by this utility model;

[0035] Figure 17 This is a cross-sectional view of the auxiliary ejector pin of the injection mold provided by this utility model in its unejected state.

[0036] Figure 18 This is a cross-sectional view showing the ejection state of the auxiliary ejector pin of the injection mold provided by this utility model;

[0037] Figure 19 A cross-sectional view showing the mating of the mounting holes and positioning pins of the steel housing;

[0038] Figure 20 A cross-sectional view showing the mating of the connection holes and sealing posts of the steel housing;

[0039] Figure 21 A partial cross-sectional view showing the electromagnet attracting a steel casing;

[0040] Figure 22 A schematic diagram of an example structure of the composite outer cover for an electrical box is shown;

[0041] Figure 23 An exploded view of an example of a composite outer cover for an electrical box is shown.

[0042] Explanation of reference numerals in the attached drawings: Moving mold 1, Moving mold plate 1a, Moving mold core 1b, Moving mold ejector assembly 1c, Moving mold support assembly 1d, Fixed mold 2, Fixed mold plate 2a, Fixed mold core 2b, Fixed mold support assembly 2c, Hot runner 2d, Outer shell cavity 3, Electromagnetic cavity 4, Electromagnet 5, Iron core 5a, Heat insulation assembly 5b, Ceramic fiber gasket layer 5b1, Titanium alloy heat insulation layer 5b2, Positioning post 6, Sealing post 7, Guide hole 7a, Post body 7b, Post shaft 7b1, Post top 7b2, Guide hole post 7c, Semi-annular ejector hole 8, Ejector 9, Inner liner cavity 10, Inlet point 11, Vent plug 12, Auxiliary ejector 13, Rod core 13a, Rod sleeve 13b, Spring 13c, Steel outer shell S1, Mounting hole, Connecting hole S12, Plastic inner liner S2. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be described in more detail below with reference to the accompanying drawings. The described embodiments are only some, not all, of the embodiments of this utility model. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. The embodiments of this utility model will be described in detail below with reference to the accompanying drawings:

[0044] In the description of this utility model, it should be understood that, unless otherwise stated, "a plurality of" means two or more; the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, as fixed connections, detachable connections, or integral connections; they can be direct connections or indirect connections through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0045] Figure 22 , 23 This diagram illustrates an example of a composite cover for an electrical box. The composite cover consists of a steel outer shell S1 and a plastic inner liner S2 fitted inside the steel outer shell S1. The steel outer shell S1 has several mounting holes and connecting holes S12 evenly distributed around its perimeter. The number and location of the mounting holes and connecting holes S12 are determined according to the dimensions of the composite cover. As shown in the diagram, there are four mounting holes, distributed at the four corners of the steel outer shell S1. There are eight connecting holes S12, evenly distributed along the four sides of the steel outer shell S1. The steel outer shell S1 is stamped from a color-coated steel sheet, and the plastic inner liner S2 is injection molded using the same mold.

[0046] like Figure 1 As shown, the injection mold includes a movable mold 1 and a fixed mold 2 that can be interlocked. Figure 2 , 3As shown, the moving mold 1 includes a moving mold plate 1a, a moving mold core 1b, a moving mold ejector assembly 1c, and a moving mold support assembly 1d. The moving mold core 1b is disposed within the moving mold plate 1a and has a first cavity for accommodating the composite outer cover of the electrical box. The moving mold plate 1a is fixed to the moving mold support assembly 1d, and the moving mold support assembly 1d is fixed to the injection molding equipment. The moving mold ejector assembly 1c is disposed on the moving mold support assembly 1d, and the ejector rod of the moving mold ejector assembly 1c slides through the moving mold plate 1a and the moving mold core 1b to eject the composite outer cover of the electrical box.

[0047] like Figure 4 , 5 As shown, the moving mold core 1b includes one side and another side opposite to the first side. One side is embedded with a shell cavity 3 having a first cavity, and the other side is provided with a plurality of electromagnetic cavities 4. Corresponding electromagnets 5 are installed in the electromagnetic cavities 4, and the other side is embedded in the moving mold plate 1a, sealing the electromagnets 5 in the electromagnetic cavities 4.

[0048] like Figure 6 As shown, the electromagnet 5 can be a cylindrical suction cup type high-temperature resistant electromagnet, which includes an iron core 5a and a heat insulation component 5b. The iron core 5a is the core component of the electromagnet; after being energized, it generates magnetic force to fix the steel shell, ensuring that the steel shell is firmly attracted and fixed in the cavity of the injection mold during the injection molding process. The heat insulation component 5b is a protective component for the electromagnet, which includes a ceramic fiber gasket layer 5b1 covering the iron core 5a and a titanium alloy heat insulation layer 5b2 covering the ceramic fiber gasket layer 5b1. Since high temperature will cause performance loss of the electromagnet, and the injection mold will have a high temperature during operation, the electromagnet needs to be protected by the heat insulation component. The diameter of the electromagnet 5 is no more than 20mm. The number of electromagnets 5 and the number of electromagnetic cavities 4 are determined according to the size of the steel shell and are distributed in a multi-point matrix. In this embodiment, small-diameter electromagnets are selected for the injection mold and distributed in a multi-point manner, such as a 2x3 matrix. This is to ensure sufficient magnetic force while allowing ample space for cooling water channels on the injection mold. The electromagnets 5 are controlled by a linkage mechanism: 1-2 seconds before the injection mold closes, the electromagnets 5 firmly attract the steel outer shell S1 into the first cavity; 1-2 seconds after the injection mold opens, the power and magnetism are deactivated, the electromagnets 5 release their attraction to the steel outer shell S1, and the injection-molded composite cover of the electrical box can be removed from the first cavity.

[0049] The first cavity contour of the outer shell cavity 3 matches the steel outer shell S1 of the composite outer cover of the electrical box, and is used to place the steel outer shell S1 during injection molding. The outer shell cavity 3 is provided with several positioning posts 6 corresponding to the mounting holes of the steel outer shell S1 of the composite outer cover of the electrical box, and several sealing posts 7 corresponding to the connecting holes S12. For example... Figure 19As shown, the positioning post 6 is cylindrical, and its position and size match the mounting hole S11 of the steel outer shell S1. It is used to position the steel outer shell in the outer shell cavity 3. When the steel outer shell S1 is placed in the outer shell cavity 3, the mounting hole S11 of the steel outer shell S1 needs to be fitted onto the positioning post 6.

[0050] like Figure 20 As shown, the number and position of the sealing posts 7 match the connecting holes S12 of the steel housing S1, and are used to seal the connecting holes to prevent leakage during injection molding. The sealing posts 7 have a movable fine-adjustment function. Specifically, as shown... Figure 7 , 8 As shown in Figure 9, the sealing pillar 7 includes a guide hole 7a, a pillar 7b, and a guide post 7c. The guide hole 7a is a convex hole formed in the moving mold core 1b. The shape of the pillar 7b matches that of the guide hole 7a, is disposed within the convex portion of the guide hole 7a, and has a portion extending out of the guide hole 7a. The guide post 7c seals the guide hole 7a except for the convex portion, and guides the pillar 7b from the length direction ( Figure 8 The longitudinal part of the guide hole 7a is sealed within the guide hole 7a. The column 7b includes a column body 7b1 and a column top 7b2. The column body 7b1 is a convex column with a shoulder at the bottom, and the column top 7b2 is a frustum extending above the guide hole 7a. The inner diameter of the convex part of the guide hole 7a is slightly larger than the outer diameter of the column 7b, allowing the column 7b to be finely adjusted radially within the guide hole 7a. The outer diameter of the guide post 7c is interfering with the inner diameter of the guide hole 7a excluding the convex part, fixing the column 7b along its length within the guide hole 7a. The bottom surface of the column 7b and the top surface of the guide post 7c are mirror surfaces, allowing them to contact and slide against each other. The steel outer shell S1 is produced using a stamping process. Due to manufacturing precision and warping deformation, there may be a positional deviation between the connecting hole S12 and the sealing post 7 of the steel outer shell S1, making it difficult for the sealing post 7 to be smoothly inserted into the connecting hole S12. During the process of placing the steel outer shell S1 into the outer shell cavity 3, the top 7b2 of the sealing column 7 first enters the connecting hole S12. Under the guidance of the truncated cone structure of the top 7b2, the column 7b moves and adjusts within the bottom hole 7a, so that the top of the top 7b2 is in complete contact with the connecting hole, thus achieving the sealing function.

[0051] like Figure 10 , 11 As shown, the positioning post 6 has two opposing semi-annular top rod holes 8 around its periphery. Figure 13As shown, the ejector rod 9 of the moving mold ejector assembly 1c is a cylindrical straight rod with a semi-annular hollow tube structure at its top corresponding to the semi-annular ejector rod hole 8. The ejector rod 9 slides through the semi-annular ejector rod hole 8. After injection molding, the moving mold ejector assembly 1c drives the ejector rod 9 to eject the composite cover of the electrical box from the outer shell cavity 3. The ejector rod 9 is positioned outside the positioning post 6 for ejection. Due to excessive injection pressure, the indentation marks are distributed around the mounting hole S11. When using the composite cover of the electrical box, it needs to be fastened to the electrical box with bolts. Therefore, by setting the outer diameter of the ejector rod to be smaller than the outer diameter of the screw cap, the resulting indentation marks will be covered by the screw cap, thus indirectly solving the problem of the indentation marks affecting the product appearance.

[0052] like Figure 14 , 15 As shown, the fixed mold 2 includes a fixed mold plate 2a, a fixed mold core 2b, a fixed mold support assembly 2c, and a hot runner 2d. The fixed mold core 2b is disposed within the fixed mold plate 2a and has a second cavity covering the composite outer cover of the electrical box. The fixed mold plate 2a is fixed to the fixed mold support assembly 2c, which is fixed to the injection molding equipment. The hot runner 2d passes through the fixed mold support assembly 2c, the fixed mold plate 2a, and the fixed mold core 2b, connecting the second cavity to the steel outer shell of the composite outer cover of the electrical box, and is used to transport molten raw materials to the second cavity.

[0053] like Figure 16 As shown, the fixed mold core 2b is provided with an inner cavity 10 having a second cavity. The inner cavity 10 contains a large amount of text and circuit diagrams that need to be injected. Several injection points 11 and vent plugs 12 are evenly arranged in the inner cavity 10. The hot runner 2d is connected to the injection points 11. The molten material in the injection molding machine enters the hot runner through the nozzle and finally enters and fills the inner cavity 10 through the injection points 11 to complete the injection. The vent plugs 12 are the venting system of this injection mold, used to expel air in the cavity during the injection process and improve defects such as cavitation and weld lines. In this embodiment, because the plastic inner liner is relatively thin and has a large area, problems such as short shots and cavitation are prone to occur during the injection process. Therefore, the injection mold uses a hot runner 2d to increase the fluidity of the molten polycarbonate material; it sets 6 injection points 11 to reduce the flow distance of the material in the cavity; and it sets 2 vent plugs 12 to expel air in the cavity and avoid defects such as cavitation and weld lines caused by multiple injection points.

[0054] Several auxiliary ejector pins 13 are provided around the inner cavity 10 to eject the composite outer cover of the electrical box from the inner cavity 10 during mold opening. Because the inner cavity 10 contains a large amount of text and circuit diagrams, the plastic inner liner S2 easily sticks to the fixed mold 2. The auxiliary ejector pins 13 are used to detach the plastic inner liner S2 from the inner cavity 10 before mold opening, preventing the workpiece from sticking to the fixed mold. Figure 17 , 18As shown, the auxiliary push rod 13 includes a rod core 13a, a rod sleeve 13b, and a spring 13c. The rod sleeve 13b is embedded in the fixed mold plate 2a. The spring 13c is sleeved on the lower part of the rod core 13a and disposed inside the rod sleeve 13b. One end of the spring 13c abuts against the bottom of the inner part of the rod sleeve 13b, and the other end abuts against the protrusion of the rod core 13a. The upper part of the rod core 13a movably passes through the fixed mold core 2b and the inner liner cavity 10. Under the action of the spring 13c, the protrusion of the rod core 13a abuts against the fixed mold core 2b. When the injection mold is in the closed state, it is squeezed by the moving mold, the top surface of the rod core 13a is flush with the surface of the inner liner cavity 10, and the spring 13c is in a compressed state; when the injection mold is opened, the moving mold moves away from the fixed mold and no longer exerts pressure on the rod core 12a. Under the action of the spring 13c, the rod core 13a is pushed outward, thereby causing the plastic inner liner S2 to detach from the inner liner cavity 10.

[0055] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of implementation of this utility model. Any equivalent changes and modifications made within the protection scope of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. An injection mold for a composite outer cover of an electrical appliance box, comprising a movable mold (1) and a fixed mold (2) that interlock with each other; characterized in that, The moving mold (1) includes a moving mold plate (1a), a moving mold core (1b), a moving mold ejector assembly (1c), and a moving mold support assembly (1d). The moving mold core (1b) is disposed within the moving mold plate (1a) and has a first cavity for accommodating the composite outer cover of the electrical box. The moving mold plate (1a) is fixed to the moving mold support assembly (1d). The moving mold ejector assembly (1c) is disposed on the moving mold support assembly (1d) and slides through the moving mold plate (1a) and the moving mold core (1b) to eject the composite outer cover of the electrical box. The fixed mold (2) includes a fixed mold plate (2a), a fixed mold core (2b), a fixed mold support assembly (2c), and a hot runner (2d). The fixed mold core (2b) is disposed inside the fixed mold plate (2a) and has a second cavity covering the composite outer cover of the electrical box. The fixed mold plate (2a) is fixed to the fixed mold support assembly (2c). The hot runner (2d) passes through the fixed mold support assembly (2c), the fixed mold plate (2a), and the fixed mold core (2b) and communicates between the second cavity and the composite outer cover of the electrical box.

2. The injection mold for a composite outer cover of an electrical box according to claim 1, characterized in that, The moving mold core (1b) includes one side and another side opposite to the first side. The first side is embedded with a shell cavity (3) containing the first cavity. The other side is provided with a plurality of electromagnetic cavities (4). Electromagnets (5) are installed in the electromagnetic cavities (4). The other side is embedded in the moving mold plate (1a).

3. The injection mold for a composite outer cover of an electrical box according to claim 2, characterized in that, The inner contour of the first cavity of the outer shell cavity (3) matches the steel outer shell of the composite outer cover of the electrical box.

4. The injection mold for a composite outer cover of an electrical box according to claim 2, characterized in that, The outer shell cavity (3) is provided with a number of positioning posts (6) around its periphery, which correspond to the mounting holes of the steel outer shell of the composite cover of the electrical box.

5. The injection mold for a composite outer cover of an electrical box according to claim 2, characterized in that, The outer shell cavity (3) is provided with a number of sealing posts (7) around the periphery, which correspond to the connection holes of the steel outer shell of the composite cover of the electrical box.

6. The injection mold for a composite outer cover of an electrical box according to claim 5, characterized in that, The sealing post (7) includes a convex guide hole (7a) opened in the moving mold core (1b); the shape of the guide hole post (7c) matches the guide hole (7a), is slightly translated and disposed in the guide hole (7a), and has a portion extending out of the guide hole (7a).

7. The injection mold for a composite outer cover of an electrical box according to claim 4, characterized in that, The positioning post (6) is provided with two opposing semi-annular push rod holes (8) around its periphery; the push rod (9) of the moving mold push rod assembly (1c) is a cylindrical straight rod with its top end being a semi-annular hollow tube structure corresponding to the semi-annular push rod hole (8). The push rod (9) slides through the semi-annular push rod hole (8) to push out the electrical box composite outer cover.

8. The injection mold for a composite outer cover of an electrical box according to claim 1, characterized in that, The fixed mold core (2b) is provided with an inner liner cavity (10) having the second cavity, and the inner liner cavity (10) is provided with a plurality of glue inlet points (11) and vent plugs (12); the hot runner (2d) is connected to the glue inlet points (11).

9. The injection mold for a composite outer cover of an electrical box according to claim 8, characterized in that, The inner lining cavity (10) is provided with a plurality of auxiliary push rods (13) around its periphery; the auxiliary push rod (13) includes a rod core (13a), a rod sleeve (13b) and a spring (13c), the rod sleeve (13b) is embedded in the fixed mold plate (2a); the spring (13c) is sleeved on the lower part of the rod core (13a) and is disposed in the rod sleeve (13b), one end of which abuts against the bottom of the rod sleeve (13b) and the other end abuts against the protrusion of the rod core (13a); the upper part of the rod core (13a) penetrates the fixed mold core (2b) and the inner lining cavity (10), and under the action of the spring (13c), the protrusion of the rod core (13a) abuts against the fixed mold core (2b).

10. The injection mold for a composite outer cover of an electrical box according to claim 2, characterized in that, The electromagnet (5) includes an iron core (5a) and a heat insulation component (5b). The heat insulation component (5b) includes a ceramic fiber pad layer (5b1) covering the iron core (5a) and a titanium alloy heat insulation layer (5b2) covering the ceramic fiber pad layer (5b1).

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