An injection mold for a molded case circuit breaker base

Abstract

This utility model belongs to the field of injection molds, specifically relating to an injection mold for a molded circuit breaker base. It includes a moving mold frame, a moving mold plate, a moving mold core, a stationary mold plate, a stationary mold core, a hot runner plate, and a stationary mold base plate. The stationary mold plate has multiple stationary mold positioning blocks arranged in a rectangular array, each with a positioning protrusion. The moving mold plate has multiple moving mold positioning blocks that cooperate with the stationary mold positioning blocks, each with a positioning groove. When the moving and stationary mold plates are closed, the positioning protrusion of each stationary mold positioning block engages with the positioning groove of each moving mold positioning block. The engagement of the multiple rectangularly arrayed stationary mold positioning blocks with the multiple moving mold positioning blocks of the moving mold plate ensures reliable mold opening and closing between the two molds. Under high pressure, the molten plastic is not squeezed into small gaps, and the injection-molded base does not produce flash, thus improving the injection molding quality of the base.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to an injection mold for a plastic case circuit breaker base. Background Technology

[0002] Molded case circuit breakers (MCCBs) are widely used in industry, agriculture, transportation, mining, civil construction, and national defense, playing a significant role in power transmission and distribution and motor protection. They are among the most widely used low-voltage electrical products. An MCCB is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and also capable of closing, carrying, and interrupting current under abnormal circuit conditions (including short-circuit conditions) within a specified time. During manufacturing, the base of the MCCB is produced using injection molding.

[0003] The existing injection molds for molded case circuit breaker bases have unreliable separation and assembly between the moving and stationary mold plates. During injection molding, the molten plastic is easily squeezed into small gaps under high pressure, forming flash at the edge of the base. The base needs secondary processing (manual trimming of flash), which increases production costs and the scrap rate of the injection molded base. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an injection mold for a molded case circuit breaker base, which can effectively enhance the reliability of mold opening and closing and improve the injection molding qualification rate of the base.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An injection mold for a molded case circuit breaker base includes a moving mold frame, a moving template disposed on the moving mold frame, a moving mold core disposed within the moving template, a stationary template disposed on the moving template, a stationary mold core disposed within the stationary template, a hot runner plate disposed on the stationary template, and a stationary mold base plate disposed on the hot runner plate. The stationary template has a plurality of stationary mold positioning blocks arranged in a rectangular array, each stationary mold positioning block having a positioning protrusion. The moving template has a plurality of moving mold positioning blocks that cooperate with the plurality of stationary mold positioning blocks, each moving mold positioning block having a positioning groove. When the moving template and the stationary template are closed, the positioning protrusion of each stationary mold positioning block engages in the positioning groove of each moving mold positioning block. A mold locking assembly is provided between the moving template and the stationary template, the mold locking assembly holding the moving template and the stationary template in a closed state.

[0006] In some embodiments, the mold-locking assembly includes a mold-locking platen rotatably disposed on a stationary mold platen and a mold-locking bolt disposed on a moving mold platen. One end of the mold-locking platen is provided with a locking hole, and when the moving mold platen and the stationary mold platen are closed, the locking hole engages with the mold-locking bolt.

[0007] In some embodiments, the static template is provided with a positioning bolt, and the other end of the locking template is provided with a positioning hole. The positioning bolt is inserted into the positioning hole, and forms a rotatable connection between the locking template and the positioning bolt.

[0008] In some embodiments, the hot runner plate is provided with a plurality of heating holes, and a plurality of heating rods are disposed in the plurality of heating holes.

[0009] In some embodiments, a heat insulation plate is provided between the hot runner plate and the stationary mold base plate.

[0010] In some embodiments, a sprue cup is provided on the stationary mold base plate, and a positioning ring is provided on the stationary mold base plate surrounding the sprue cup. Two base mold cavities are formed between the moving mold core and the stationary mold core. A flow channel is provided between the moving mold core and the stationary mold core. The flow channel is connected to the two base mold cavities. The lower end of the sprue cup passes through the stationary mold base plate, the hot runner plate, the stationary mold plate, and the stationary mold core in sequence and is connected to the flow channel.

[0011] In some embodiments, the moving mold frame is provided with an ejector pin assembly, which includes an ejector pin backing plate, an ejector pin plate, and multiple ejector pins linked to the ejector pin plate. The ejector pin backing plate is slidably disposed in the moving mold frame, and the ejector pin plate is linked to the ejector pin backing plate. The ejector pin plate drives the multiple ejector pins to pass through the moving mold plate and the moving mold core in sequence and to be inserted into the two base mold cavities respectively.

[0012] In some embodiments, a scrap ejector rod is linked to the ejector plate, and the ejector plate drives the scrap ejector rod to pass through the moving mold plate and the moving mold core in sequence and to be inserted into the flow channel.

[0013] In some embodiments, the ejector plate has four guide shafts arranged in a rectangular array, and the moving template is provided with four guide holes through which the four guide shafts can pass. The ejector plate drives the four guide shafts to slide back and forth within the four guide holes.

[0014] In some embodiments, an ejector plate is provided on the lower end surface of the ejector pin plate, the ejector plate is provided with a U-shaped slot, and the moving mold frame is provided with a through hole corresponding to the ejector plate for the ejector rod of the injection molding machine to pass through.

[0015] The beneficial effects of this utility model are as follows: The static template is engaged with the moving template by multiple static mold positioning blocks arranged in a rectangular array, ensuring that the static template and the moving template can reliably separate and close. No small gaps will be generated between the static template and the moving template, and the molten plastic will not be squeezed into the small gaps under high pressure. As a result, the injection-molded base will not produce flash, which is conducive to improving the injection molding quality of the base. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0019] Figure 3 This is an exploded view of an embodiment of the present utility model. Detailed Implementation

[0020] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0024] like Figure 1-3As shown, an injection mold for a molded case circuit breaker base includes a moving mold frame 1, a moving template 2 disposed on the moving mold frame 1, a moving mold core 3 disposed within the moving template 2, a stationary template 4 disposed on the moving template 2, a stationary mold core 5 disposed within the stationary template 4, a hot runner plate 6 disposed on the stationary template 4, and a stationary mold base plate 7 disposed on the hot runner plate 6. The stationary template 4 has a plurality of stationary mold positioning blocks 41 arranged in a rectangular array, each stationary mold positioning block 41 having a positioning protrusion 411. The moving template 2 has a plurality of moving mold positioning blocks 21 that cooperate with the plurality of stationary mold positioning blocks 41, each moving mold positioning block 21 having a positioning groove 211. When the moving template 2 and the stationary template 4 are closed, the positioning protrusion 411 of each stationary mold positioning block 41 engages in the positioning groove 211 of each moving mold positioning block 21. A mold locking assembly 8 is disposed between the moving template 2 and the stationary template 42, holding the moving template 2 and the stationary template 4 in a closed state.

[0025] like Figure 1 and 3 As shown, the mold clamping assembly 8 includes a clamping plate 81 rotatably mounted on the stationary platen 4 and a clamping bolt 82 mounted on the moving platen 2. One end of the clamping plate 81 has a locking hole 811. When the moving platen 2 and the stationary platen 4 are closed, the locking hole 811 engages with the clamping bolt 82. During mold closing, the mold clamping assembly can reliably lock the moving and stationary platens, thereby improving the mold closing reliability of the injection mold. A positioning bolt 83 is mounted on the stationary platen 4, and a positioning hole 812 is mounted on the other end of the clamping plate 81. The positioning bolt 83 passes through the positioning hole 812, forming a rotatable connection between the clamping plate 81 and the positioning bolt 83. The clamping plate is connected to the stationary platen via the positioning bolt, facilitating the assembly of the clamping plate and the stationary platen and improving assembly efficiency. The hot runner plate 6 has multiple heating holes, each containing a heating rod 61. The heating rods heat the hot runner plate, ensuring optimal flow of the molten plastic within it. A heat insulation plate 62 is provided between the hot runner plate 6 and the stationary mold base plate 7. The heat insulation plate can insulate against heat loss from the hot runner plate, thereby improving the injection quality of the injection mold. A sprue cup 71 is provided on the stationary mold base plate 7, and a positioning ring 72 is provided on the stationary mold base plate 7 surrounding the sprue cup 71. Two base mold cavities 100 are formed between the moving mold core 3 and the stationary mold core 5. A runner 101 is provided between the moving mold core 3 and the stationary mold core 5, and the runner 101 is connected to the two base mold cavities 100. The lower end of the sprue cup 71 passes through the stationary mold base plate 7, the hot runner plate 6, the stationary mold plate 4, and the stationary mold core 5 in sequence and is connected to the runner 101. The positioning ring engages with the injection molding machine, thereby enabling quick installation of the injection mold and the injection molding machine. The dual mold cavity structure design allows for the injection of two circuit breaker bases in one mold opening and closing, thereby improving the injection efficiency of the injection mold.

[0026] like Figure 2 ,3 As shown, an ejector assembly 9 is provided inside the moving mold base 1. The ejector assembly 9 includes an ejector plate 91, an ejector plate 92, and multiple ejector pins 93 linked to the ejector plate 92. The ejector plate 91 is slidably disposed within the moving mold base 1, and the ejector plate 92 is linked to the ejector plate 91. The ejector plate 92 drives the multiple ejector pins 93 to pass sequentially through the moving mold plate 2 and the moving mold core 3, and to be inserted into the two base mold cavities 100 respectively. During mold opening, the ejector assembly can eject the base, thereby achieving smooth and rapid demolding of the base. A scrap ejector rod 94 is linked to the ejector plate 92. The ejector plate 92 drives the scrap ejector rod 94 to pass sequentially through the moving mold plate 2 and the moving mold core 3, and to be inserted into the runner 101. During mold opening, the ejector plate drives the scrap ejector rod to eject the scrap material in the runner, achieving the purpose of automatic scrap removal. Four guide shafts 95 are arranged in a rectangular array on the ejector plate 92. The moving mold plate 2 has four guide holes 212 through which the four guide shafts 95 pass. The ejector plate 92 drives the four guide shafts 95 to slide back and forth within the four guide holes 212. The four guide shafts guide the ejector plate, ensuring reliable operation. An ejector plate 96 is provided on the lower end face of the ejector plate 91. The ejector plate 96 has a U-shaped slot 961. A through hole 11 is provided on the moving mold frame 1 corresponding to the ejector plate 96, through which the ejector rod of the injection molding machine passes. The ejector plate engages with the ejector rod of the injection molding machine via the ejector plate, facilitating the installation of the injection mold and the injection molding machine, thus improving installation efficiency.

[0027] The static mold platen engages with the moving mold platen through multiple static mold positioning blocks arranged in a rectangular array, ensuring that the static and moving mold plates can reliably separate and close. No small gaps will be generated between the static and moving mold plates, and the molten plastic will not be squeezed into the small gaps under high pressure. As a result, the injection-molded base will not produce flash, which helps to improve the injection molding quality of the base.

[0028] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. An injection mold for a molded case circuit breaker base, comprising a moving mold frame, a moving template disposed on the moving mold frame, a moving mold core disposed within the moving template, a stationary template disposed on the moving template, a stationary mold core disposed within the stationary template, a hot runner plate disposed on the stationary template, and a stationary mold base plate disposed on the hot runner plate, characterized in that: The static template has multiple static mold positioning blocks arranged in a rectangular array, each static mold positioning block having a positioning protrusion. The moving template has multiple moving mold positioning blocks that cooperate with the static mold positioning blocks, each moving mold positioning block having a positioning groove. When the moving template and the static template are closed, the positioning protrusion of each static mold positioning block engages in the positioning groove of each moving mold positioning block. A mold locking assembly is provided between the moving template and the static template, the mold locking assembly holding the moving template and the static template in the closed mold state.

2. The injection mold for the molded case circuit breaker base according to claim 1, characterized in that: The mold-locking assembly includes a mold-locking platen rotatably mounted on the stationary mold platen and a mold-locking bolt mounted on the moving mold platen. One end of the mold-locking platen is provided with a locking hole. When the moving mold platen and the stationary mold platen are closed, the locking hole engages with the mold-locking bolt.

3. The injection mold for the molded case circuit breaker base according to claim 2, characterized in that: The static template is provided with positioning bolts, and the other end of the locking template is provided with positioning holes. The positioning bolts are inserted into the positioning holes, forming a rotatable connection between the locking template and the positioning bolts.

4. The injection mold for the molded case circuit breaker base according to claim 1, characterized in that: The hot runner plate is provided with a plurality of heating holes, and a plurality of heating rods are provided in the plurality of heating holes.

5. The injection mold for the molded case circuit breaker base according to claim 4, characterized in that: A heat insulation plate is provided between the hot runner plate and the stationary mold base plate.

6. The injection mold for the molded case circuit breaker base according to claim 1, characterized in that: The stationary mold base plate is provided with a sprue cup, and the stationary mold base plate is provided with a positioning ring surrounding the sprue cup. Two base mold cavities are formed between the moving mold core and the stationary mold core. A flow channel is provided between the moving mold core and the stationary mold core. The flow channel is connected to the two base mold cavities. The lower end of the sprue cup passes through the stationary mold base plate, the hot runner plate, the stationary mold plate, and the stationary mold core in sequence and is connected to the flow channel.

7. The injection mold for the molded case circuit breaker base according to claim 6, characterized in that: The moving mold frame is provided with an ejector pin assembly, which includes an ejector pin back plate, an ejector pin plate, and multiple ejector pins linked to the ejector pin plate. The ejector pin back plate is slidably disposed in the moving mold frame, and the ejector pin plate is linked to the ejector pin back plate. The ejector pin plate drives the multiple ejector pins to pass through the moving mold plate and the moving mold core in sequence and to be inserted into the two base mold cavities respectively.

8. The injection mold for the base of a molded case circuit breaker according to claim 7, characterized in that: The ejector plate is linked to a scrap ejector rod, which is driven by the ejector plate to pass through the moving mold plate and the moving mold core in sequence and to be inserted into the flow channel.

9. The injection mold for the molded case circuit breaker base according to claim 7, characterized in that: The ejector plate has four guide shafts arranged in a rectangular array, and the moving template has four guide holes through which the four guide shafts can pass. The ejector plate drives the four guide shafts to slide back and forth within the four guide holes.

10. The injection mold for the base of a molded case circuit breaker according to claim 7, 8, or 9, characterized in that: The ejector plate is provided with an ejector plate on its lower end surface. The ejector plate is provided with a U-shaped slot. The moving mold frame is provided with a through hole corresponding to the ejector plate, through which the ejector rod of the injection molding machine can pass.

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