Injection mold for forming circuit breaker base

Abstract

The utility model discloses an injection mold for forming a circuit breaker base, which comprises a fixed mold assembly and a movable mold assembly, a guide mechanism is arranged between the fixed mold assembly and the movable mold assembly, the mold is closed through the guide mechanism, a mold core and a mold cavity are arranged in the fixed mold assembly and the movable mold assembly, and the mold core and the mold cavity are arranged in the fixed mold assembly and the movable mold assembly. A plurality of exhaust holes are formed in the surface of the mold core, meanwhile, the same exhaust holes are also formed in the position, corresponding to the mold core, in the fixed mold assembly, and cooling systems are further arranged in the movable mold assembly and the fixed mold assembly and used for cooling after injection molding. According to the utility model, the exhaust effect after injection molding of the base is improved, and the surface of the mold is prevented from cracking.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field, especially a kind of injection mold for the molding circuit breaker base. BACKGROUND

[0002] As important protection elements in power system, the quality of the base of circuit breaker is directly related to the safety and stability of the entire power system. With the increasing demand for the performance of circuit breaker, injection molding technology has become one of the main processes for manufacturing high-quality circuit breaker base.

[0003] In the traditional injection molding process of circuit breaker base, the conventional mold design structure is usually used. During the injection molding process, air holes may be generated on the surface of the base due to incomplete exhaust, and even chicken claw crack phenomenon may occur, which seriously affects the quality and service life of the final product. To solve these problems, the common methods include adding exhaust grooves on the mold structure and improving the mold structure to improve bubble removal. Although these methods can alleviate the air hole and crack problems to some extent, there are still deficiencies in actual application. SUMMARY

[0004] The present application provides an injection mold for molding circuit breaker base, which improves the exhaust effect after injection molding of the base and avoids cracking on the surface of the mold.

[0005] The injection mold for molding circuit breaker base provided by the present application adopts the following technical solution:

[0006] An injection mold for molding circuit breaker base includes a fixed mold assembly and a movable mold assembly. A guide mechanism is provided between the fixed mold assembly and the movable mold assembly. The fixed mold assembly and the movable mold assembly are combined through the guide mechanism. A core and a cavity are provided in the fixed mold assembly and the movable mold assembly. A plurality of exhaust holes are formed on the surface of the core. At the same time, the same exhaust holes are also formed in the fixed mold assembly corresponding to the position of the core. A cooling system is further provided in the movable mold assembly and the fixed mold assembly for cooling after injection molding.

[0007] By adopting the above technical solution, the injection mold for molding circuit breaker base designed by the present application combines the fixed mold assembly and the movable mold assembly through the guide mechanism, and completes the injection molding of the base mold using the core and the cavity. During the molding process of the base, air may be trapped on the surface of the base, resulting in air holes in the product and further causing cracking of the product. Therefore, exhaust holes are formed on the surface of the core and in the fixed mold assembly to exhaust the gas. At the same time, a cooling system is also provided in the mold to improve the efficiency of the mold injection molding.

[0008] Preferably, the fixed mold assembly includes a fixed mold base and a positioning pin installed on the fixed mold base, the positioning pin is used for positioning the movable mold assembly when closing the mold, an injection port is provided on the top of the fixed mold base, and the exhaust hole on the movable mold assembly is provided inside the movable mold base.

[0009] By adopting the above technical solution, during use, the positioning pins are used to keep the fixed mold assembly and the movable mold assembly fixed after the mold is closed, thereby improving the stability of the mold injection molding. At the same time, the top injection port of the fixed mold base is used to inject material.

[0010] Preferably, the movable mold assembly includes a movable mold base and a positioning hole opened at the bottom of the movable mold base, and the positioning hole is used for inserting a positioning pin.

[0011] By adopting the above technical solution, when in use, the movable mold assembly is provided with a positioning hole that cooperates with the positioning pin for fixation.

[0012] Preferably, the movable mold base is further provided with an ejection mechanism, which includes an ejector plate and an ejector pin. The ejector plate is connected to the ejector rod of the injection molding machine, and the ejector pin is fixed to the ejector plate for ejecting the mold after injection molding.

[0013] By adopting the above technical solution, when in use, the ejector rod of the injection molding machine is connected to the ejector plate, thereby driving the ejector plate to move and move the ejector pins on the ejector plate, so that the mold after injection molding is ejected by the ejector pins.

[0014] Preferably, the guide mechanism includes a guide post and a guide sleeve, the guide post is arranged on the fixed mold assembly, and the guide sleeve is arranged on the movable mold assembly.

[0015] By adopting the above technical solution, when in use, the fixed mold assembly and the movable mold assembly can be quickly closed by utilizing the mutual connection between the guide pillar and the guide sleeve, thereby improving the working efficiency of the mold injection.

[0016] Preferably, there are multiple exhaust holes, corresponding to the areas on the surface of the base where chicken claw cracks are likely to appear, and the edges of the exhaust holes are provided with air-guiding slopes.

[0017] By adopting the above technical solution, when in use, the exhaust holes are set at the parts of the base surface where chicken claw cracks are likely to appear. At the same time, the air guide slope is set at the edge of the exhaust hole to improve the exhaust effect.

[0018] Preferably, a heat insulating layer is provided between the exhaust hole and the cooling system to avoid the cooling system affecting the exhaust of the exhaust hole.

[0019] By adopting the above technical solution, when in use, a heat insulating layer is provided between the exhaust hole and the cooling system to prevent the cooling of the cooling system from affecting the temperature of the exhaust hole, thereby affecting the exhaust effect.

[0020] Preferably, the cooling system comprises a plurality of cooling water channels arranged around the mold assembly and the movable mold assembly, and the cooling liquid in the cooling water channels flows in a direction intersecting the direction of the plastic flow.

[0021] By using the above technical scheme, in use, the cooling system is realized by the cooling water channels in the mold assembly and the movable mold assembly, the cooling water channels are filled with cooling water, thereby effectively reducing the heat of the mold after injection molding.

[0022] In summary, the present application has the following beneficial effects:

[0023] 1. The injection mold for forming a circuit breaker base is designed, a plurality of exhaust holes are arranged on the surface of the core and the cavity, the gas in the cavity can be effectively exhausted, the generation of bubbles or chicken claw defects during the forming process is prevented, and the surface quality of the circuit breaker base is improved.

[0024] 2. The injection mold for forming a circuit breaker base is designed, a cooling system is arranged in the movable mold assembly and the mold assembly, the cooling speed can be effectively accelerated, the forming cycle is shortened, the production efficiency is improved, and a heat insulation layer is arranged between the cooling system and the exhaust hole, the exhaust effect of the exhaust hole is not affected by the cooling system, and the finished product quality of the circuit breaker base is further improved.

[0025] 3. The injection mold for forming a circuit breaker base is designed, the movable mold assembly and the mold assembly are quickly clamped by the guide mechanism, and the working efficiency of the mold injection molding is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 It is a structure schematic view of the mold clamping of the embodiment;

[0027] Fig. 2 It is a structure schematic view of the mold clamping of the embodiment;

[0028] Fig. 3 It is a structure schematic view of the mold clamping of the embodiment;

[0029] Fig. 4 It is a sectional view of the mold of the embodiment;

[0030] The reference signs are explained as follows: 1, the mold assembly; 2, the movable mold assembly; 3, the guide mechanism; 31, the guide column; 32, the guide sleeve; 4, the core; 5, the cavity; 6, the exhaust hole; 7, the cooling system; 71, the cooling water channel; 8, the mold base; 9, the positioning pin; 10, the injection port; 11, the movable mold base; 12, the positioning hole; 13, the ejection mechanism; 131, the ejector plate; 132, the ejector pin. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings. Like components are denoted by like reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "bottom," and "top" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0032] The utility model discloses an injection mold for forming a circuit breaker base, such as Figs. 1 to 4 As shown, the mold assembly comprises a fixed mold assembly 1, a movable mold assembly 2, a guide mechanism 3, a core 4 and a cavity 5, exhaust holes 6, and a cooling system 7. The mold closing operation is achieved through the guide mechanism 3. Multiple exhaust holes 6 are provided on the surface of the core 4 and within the fixed mold assembly 1. The cooling system 7 is installed within the movable mold assembly 2 and the fixed mold assembly 1 to achieve efficient cooling. This structure effectively solves the problems of poor exhaust and insufficient cooling during the injection molding process, thereby significantly improving the molding quality of the base.

[0033] Specifically, the fixed mold assembly 1 includes a fixed mold base 8 and a positioning pin 9 installed thereon. The positioning pin 9 is used for the mold closing positioning of the movable mold assembly 2 to ensure the stability of the mold in the working state. An injection port 10 is set on the top of the fixed mold base 8 to deliver molten plastic into the cavity 5. The position, structural dimensions and material of the injection port 10 are optimized. The material of the fixed mold base 8 can be selected from high-strength aluminum alloy or steel material, and its thickness is adjusted according to the actual working conditions. The positioning pin 9 is generally made of high-strength stainless steel and has a cylindrical shape. When inserted into the positioning hole 12, it needs to be accurate to the micron level to ensure the mold closing accuracy. The exhaust hole 6 on the fixed mold base 8 is set inside the fixed mold base 8, and complements the exhaust hole 6 structure around the core 4 to form an effective exhaust network. The edge of the exhaust hole 6 is designed as an air guide slope to facilitate the effective discharge of gas and prevent the backflow of plastic.

[0034] The movable mold assembly 2 includes a movable mold base 11 and a positioning hole 12 provided at the bottom of the movable mold base 11. The positioning hole 12 matches the positioning pin 9 on the fixed mold assembly 1 to complete the mold closing process. The movable mold base 11 is also provided with an ejection mechanism 13. The ejection mechanism 13 includes an ejector plate 131 and an ejector pin 132. The ejector plate 131 is connected to the ejector rod of the injection molding machine to drive the ejector pin 132 to eject the molded circuit breaker base. The ejector plate 131 of the ejector mechanism 13 must be made of a material with a certain degree of elasticity, and the ejector pin 132 must be made of a high-strength, wear-resistant material such as cemented carbide to ensure that it is not easily worn out during long-term use. The connection between the ejector plate 131 and the ejector rod can be a threaded fit or a snap-on design to meet the requirements of efficient and stable ejection.

[0035] The guide mechanism 3 comprises a guide column 31 and a guide sleeve 32, the guide column 31 is arranged on the fixed die assembly 1, and the guide sleeve 32 is arranged on the movable die assembly 2. The guide column 31 is made of wear-resistant material, and the guide sleeve 32 is made of hard alloy with better wear resistance. The cooperation gap of the two needs to be controlled within a proper range, so as to ensure the clamping accuracy and service life. In order to improve the guiding accuracy, the surface of the guide column 31 can be ground, and a lubricating coating is added to the contact part.

[0036] The number of exhaust holes 6 is multiple, which is distributed on the position where the chicken claw crack is easy to appear on the base surface, especially the product edge and corner. In order to improve the functionality of the exhaust hole 6, the edge is provided with a small gas guide slope, which helps the gas to be quickly discharged along the slope, prevents the plastic from being retained to cause insufficient filling. A heat insulation layer is arranged between the exhaust hole 6 and the cooling system 7, so as to avoid the influence of the cooling system 7 on the normal work of the exhaust hole 6. The heat insulation layer can be made of high polymer heat insulation material or ceramic composite material, which prevents the temperature of the cooling liquid in the cooling channel from affecting the temperature distribution around the exhaust hole 6, and ensures the structural strength of the whole mold.

[0037] The cooling system 7 comprises a plurality of cooling water channels 71 arranged around the fixed die assembly 1 and the movable die assembly 2. The cross section of the cooling water channel 71 is usually circular or elliptical, and the cooling water flow direction is cross with the plastic inflow direction, so as to enhance the cooling effect and reduce the stress problem caused by temperature gradient. In a specific design, the inlet end and the outlet end of the cooling water channel 71 are respectively connected with an external circulating cooling device.

[0038] Working principle: the injection mold for forming the circuit breaker base of the utility model, through reasonable arrangement of multiple exhaust holes 6 and cooperation of the optimized design of the cooling system 7, the gas removal effect in the injection molding process is greatly improved, and the cooling efficiency is effectively improved. This not only solves the problems that the chicken claw crack is easy to appear on the base surface and the like, but also greatly shortens the production cycle and improves the production efficiency.

[0039] The above are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered in the protection scope of the present application.

Claims

1. An injection mold for forming a circuit breaker base, characterized by: The invention comprises a fixed mold assembly (1) and a movable mold assembly (2); a guide mechanism (3) is provided between the fixed mold assembly (1) and the movable mold assembly (2); the mold is closed by the guide mechanism (3); a core (4) and a cavity (5) are provided in the fixed mold assembly (1) and the movable mold assembly (2); a surface of the core (4) is provided with a plurality of exhaust holes (6); at the same time, the fixed mold assembly (1) is provided with similar exhaust holes (6) at positions corresponding to the core (4); a cooling system (7) is also provided in the movable mold assembly (2) and the fixed mold assembly (1) for cooling after injection molding.

2. The injection mold for forming a circuit breaker base according to claim 1, characterized in that: The fixed mold assembly (1) comprises a fixed mold base (8) and a positioning pin (9) mounted on the fixed mold base (8); the positioning pin (9) is used for positioning the movable mold assembly (2) during mold closing; an injection port (10) is provided on the top of the fixed mold base (8); and an exhaust hole (6) on the movable mold assembly (2) is provided inside the movable mold base (11).

3. The injection mold for forming a circuit breaker base according to claim 1, characterized in that: The movable mold assembly (2) comprises a movable mold base (11) and a positioning hole (12) provided at the bottom of the movable mold base (11); the positioning hole (12) is used for inserting a positioning pin (9).

4. The injection mold for forming a circuit breaker base according to claim 3, characterized in that: The movable mold base (11) is also provided with an ejection mechanism (13), the ejection mechanism (13) comprising an ejector plate (131) and an ejector pin (132), the ejector plate (131) being connected to an ejector rod of an injection molding machine, and the ejector pin (132) being fixed on the ejector plate (131) for ejecting the mold after injection molding.

5. The injection mold for forming a circuit breaker base according to claim 1, characterized in that: The guide mechanism (3) comprises a guide column (31) and a guide sleeve (32); the guide column (31) is arranged on the fixed mold assembly (1); and the guide sleeve (32) is arranged on the movable mold assembly (2).

6. The injection mold for forming a circuit breaker base according to claim 1, characterized in that: The number of the exhaust holes (6) is multiple, corresponding to the parts of the base surface where chicken claw cracks are likely to appear, and the edges of the exhaust holes (6) are provided with air guide slopes.

7. The injection mold for forming a circuit breaker base according to claim 1, characterized in that: A heat insulating layer is provided between the exhaust hole (6) and the cooling system (7), thereby preventing the cooling system (7) from affecting the exhaust of the exhaust hole (6).

8. The injection mold for forming a circuit breaker base according to claim 1, characterized in that: The cooling system (7) comprises a plurality of cooling water channels (71) arranged around the fixed mold assembly (1) and the movable mold assembly (2), wherein the flow direction of the coolant in the cooling water channels (71) is arranged to intersect with the inflow direction of the plastic.

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