Pressure injection mold for circuit breaker base

Abstract

The utility model relates to a pressure injection mold for a circuit breaker base, and relates to the technical field of circuit breaker machining, the pressure injection mold comprises an upper mold and a lower mold, an upper mold core is embedded in the bottom side of the upper mold, a lower mold core is embedded in the upper surface of the lower mold, and the upper mold core and the lower mold core abut against each other to form a pressure injection cavity; a runner communicated with the pressure injection cavity is formed in the upper mold, and a material pushing assembly and a material folding assembly are arranged in the lower mold; a plurality of positioning insertion rods are fixedly arranged on the upper surface of the lower mold, positioning insertion grooves corresponding to the positioning insertion rods are formed in the bottom side of the upper mold, and limiting sleeves allowing the positioning insertion rods to be inserted in are fixedly arranged in the positioning insertion grooves; according to the injection molding device, when the upper mold and the lower mold are assembled, the positioning insertion rods on the lower mold are inserted into the limiting sleeves corresponding to the bottom side of the upper mold, so that the possibility of deflection or dislocation caused by the external environment (vibration) when the upper mold and the lower mold are assembled is reduced, and the injection molding quality of the circuit breaker shell is improved.

Description

Technical Field

[0001] This application relates to the technical field of circuit breaker manufacturing, and in particular to an injection molding die for a circuit breaker base. Background Technology

[0002] In the manufacturing process of circuit breaker plastic housings, injection molding is a commonly used method. Injection molding is a molding method that evolved from compression molding. It involves melting the raw material and injecting it into a mold cavity, where the material continues to be heated and pressed to solidify and form the desired shape.

[0003] Among related technologies, invention patent CN115503185A discloses an injection molding die and process for circuit breaker bases, including a moving mold, a fixed mold, two lower mold cores embedded in the moving mold, two upper mold cores embedded in the fixed mold, a pusher assembly for ejecting the circuit breaker base, and a deflector assembly on the moving mold. The lower mold cores correspond to different upper mold cores. This precise fit achieves efficient molding of the circuit breaker base and efficient waste disposal. During mold closing, the upper and lower mold cores work closely together to form a closed cavity. Molten material is precisely injected through the main flow channel and branch flow channels. After molding, the cleverly designed deflector and pusher assembly separates and removes the product from the waste material.

[0004] However, this precision system faces challenges in complex and variable application environments, especially when the mold is frequently subjected to vibration. Even minute misalignments or displacements between the moving and stationary molds can severely affect the cavity's sealing, leading to leakage of molten material under high pressure. This not only reduces injection efficiency but may also affect the final product quality and consistency, indicating room for improvement. Utility Model Content

[0005] The purpose of this application is to provide an injection mold for circuit breaker bases, which solves the problem in the above-mentioned related technologies that a slight offset or misalignment may occur when the moving mold and the fixed mold are closed, which may further cause the molten material to leak under high pressure.

[0006] The injection molding die for a circuit breaker base provided in this application adopts the following technical solution:

[0007] An injection molding die for a circuit breaker base includes an upper die and a lower die. An upper die core is embedded in the bottom side of the upper die, and a lower die core is embedded in the upper surface of the lower die. The upper die core and the lower die core abut against each other to form an injection cavity. A flow channel communicating with the injection cavity is opened on the upper die. A pushing assembly and a bending assembly are provided inside the lower die. A plurality of positioning rods are fixed on the upper surface of the lower die, and a positioning slot corresponding to the positioning rods is opened on the bottom side of the upper die. A limiting sleeve for the insertion of the positioning rods is fixed inside the positioning slot.

[0008] By adopting the above technical solution, when the upper mold and the lower mold are closed, several positioning rods on the lower mold are inserted into the corresponding limiting sleeves on the bottom side of the upper mold, thereby reducing the possibility of skewing or misalignment of the upper mold and the lower mold when they are closed due to external environment (vibration), and improving the quality of circuit breaker housing injection molding.

[0009] Optionally, the positioning rod has several annular grooves evenly distributed around its own axis on its outer periphery.

[0010] By adopting the above technical solution, due to the presence of the annular grooves, friction and pressure are no longer concentrated on the single smooth surface of the positioning rod, but are distributed on the edges of multiple annular grooves. This dispersion effect helps reduce wear between the positioning rod and the limiting sleeve, extending their service life.

[0011] Optionally, the cross-sectional shape of the annular groove is semi-circular.

[0012] By adopting the above technical solution, it is not only convenient to open the annular groove, but also convenient to disperse the stress on the outer circumference of the positioning rod, thereby improving the structural strength of the positioning rod.

[0013] Optionally, a limiting ring is fixed on the outer periphery of the end of the limiting sleeve away from the lower mold, and a limiting ring groove for the limiting ring to be inserted is provided on the inner wall of the positioning slot.

[0014] By adopting the above technical solution, before assembling the upper mold, the limiting ring is pre-placed into the limiting ring groove, and then the upper mold is assembled. In this way, the installation and fixation of the limiting sleeve can be achieved by snap-fit ​​placement, which improves the corresponding installation efficiency and facilitates subsequent disassembly and replacement.

[0015] Optionally, a positioning retaining ring is fixed on the outer periphery of the end of the positioning rod away from the upper mold, and an installation groove for inserting one end of the positioning rod is formed on the upper surface of the lower mold, and a positioning ring groove for inserting the positioning retaining ring is formed on the side wall of the installation groove.

[0016] By adopting the above technical solution, the positioning ring is inserted into the positioning ring groove before the lower mold is assembled, and then the lower mold is assembled. The positioning rod can be installed and fixed by snap-fit ​​placement, which improves the installation efficiency and facilitates subsequent disassembly and replacement.

[0017] Optionally, the upper mold is fixed with a plurality of guide blocks on its bottom side, the lower mold is provided with a placement groove, the lower mold is fixed with a support block on the bottom side of the placement groove, and the support block is provided with a guide slot for the guide blocks to be inserted.

[0018] By adopting the above technical solution, when the upper mold and the lower mold are closed, several guide blocks are inserted into the guide slots on the corresponding support blocks, thereby further reducing the possibility of the upper mold and the lower mold being misaligned or displaced when they are closed due to external environmental factors (vibration).

[0019] Optionally, several guide blocks are offset on the bottom side of the upper mold.

[0020] By adopting the above technical solution, when the guide block is inserted into the guide slot, the misaligned installation of the guide block further improves the contact stability between the upper and lower molds in the mold closing state.

[0021] Optionally, the end edge of the positioning rod away from the lower mold is a guide arc surface, and the inner edge of the opening of the limiting sleeve facing the lower mold is a guide arc surface.

[0022] By adopting the above technical solution, it is easy to insert the positioning rod into the corresponding limiting sleeve along the guide arc surface and the guide arc surface.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. When the upper and lower molds are closed, several positioning pins on the lower mold are inserted into the corresponding limiting sleeves on the bottom side of the upper mold. This reduces the possibility of misalignment or displacement of the upper and lower molds when they are closed due to external environmental factors (vibration), thereby improving the quality of the circuit breaker housing injection molding. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0027] Figure 2 This is a cross-sectional structural diagram illustrating the installation and assembly of the upper and lower models in an embodiment of this application;

[0028] Figure 3 This is a partial cross-sectional view of an embodiment of the present application illustrating the installation and cooperation of the positioning rod and the limiting sleeve;

[0029] Figure 4 This is an exploded structural diagram illustrating the installation distribution of the limiting sleeve and the positioning rod in an embodiment of this application;

[0030] Figure 5This is a partial cross-sectional view of the installation and fitting of the positioning plug in an embodiment of this application;

[0031] Figure 6 yes Figure 5 An enlarged schematic diagram of part A in the middle;

[0032] Figure 7 This is a schematic diagram illustrating the installation distribution of the guide block and support block in an embodiment of this application;

[0033] Figure 8 This is a partial cross-sectional structural diagram illustrating the installation and cooperation of the guide block and the support block in an embodiment of this application.

[0034] In the diagram, 1. Upper mold; 11. Positioning slot; 111. Limiting ring groove; 12. Limiting sleeve; 121. Limiting retaining ring; 122. Guide arc surface; 13. Guide block; 2. Lower mold; 21. Positioning rod; 211. Positioning retaining ring; 212. Guide arc surface; 213. Annular groove; 22. Installation groove; 221. Positioning ring groove; 23. Placement groove; 24. Support block; 241. Guide slot; 3. Upper mold core; 4. Lower mold core; 5. Pushing assembly; 6. Folding assembly. Detailed Implementation

[0035] The present application will be further described in detail below with reference to all the accompanying drawings.

[0036] Example:

[0037] Reference Figure 1 and Figure 2 An injection molding die for a circuit breaker base includes an upper die 1 and a lower die 2. An upper die core 3 is embedded on the bottom side of the upper die 1, and a lower die core 4 is embedded on the upper surface of the lower die 2. The upper die core 3 and the lower die core 4 abut against each other to form an injection cavity. A flow channel (not shown in the figure) communicating with the injection cavity is opened on the upper die 1. A pusher assembly 5 and a deflector assembly 6 are provided in the lower die 2. The pusher assembly 5 and the deflector assembly 6 and other related technologies have been clearly described in the relevant technology and will not be repeated here.

[0038] Reference Figure 3 and Figure 4 Positioning rods 21 are fixed at the four corners of the upper surface of the lower mold 2. The bottom side of the upper mold 1 is provided with positioning slots 11 corresponding to the positioning rods 21. A limiting sleeve 12 for the positioning rods 21 to be inserted is fixed inside the positioning slot 11. Through the cooperation of the positioning rods 21 and the limiting sleeves 12, when the mold is closed, the positioning rods 21 are inserted into the corresponding limiting sleeves 12, reducing the possibility of the upper mold 1 and the lower mold 2 being misaligned or misaligned when the external environment (vibration) is closed.

[0039] Reference Figure 4 and Figure 5A limiting ring 121 is integrally formed on the outer periphery of the end of the limiting sleeve 12 away from the lower mold 2. A limiting ring groove 111 for inserting the limiting ring 121 is provided on the inner wall of the positioning slot 11. A positioning ring 211 is integrally formed on the outer periphery of the end of the positioning rod 21 away from the upper mold 1. An installation groove 22 for inserting one end of the positioning rod 21 is provided on the upper surface of the lower mold 2. A positioning ring groove 221 for inserting the positioning ring 211 is provided on the side wall of the installation groove 22.

[0040] Since both the upper mold 1 and the lower mold 2 are composed of multiple plate-shaped structures and related injection structures, when installing the limiting sleeve 12 and the positioning rod 21, the limiting ring 121 can be pre-placed into the limiting ring groove 111 and the positioning ring 211 can be inserted into the positioning ring groove 221 before the upper mold 1 and the lower mold 2 are assembled.

[0041] Reference Figure 4 The end edge of the positioning rod 21 away from the lower mold 2 is a guide arc surface 212, and the inner edge of the opening of the limiting sleeve 12 facing the lower mold 2 is a guide arc surface 122. This arrangement facilitates the insertion of the positioning rod 21 into the corresponding limiting sleeve 12 along the guide arc surface 212 and the guide arc surface 122.

[0042] Reference Figure 5 and Figure 6 The positioning rod 21 has several annular grooves 213 evenly distributed around its axis on its outer periphery, and the cross-sectional shape of the annular grooves 213 is semi-circular. The design of the annular grooves 213 effectively helps to disperse friction and pressure. Due to the presence of the annular grooves 213, friction and pressure are no longer concentrated on a single smooth surface of the positioning rod 21, but are distributed on the edges of the multiple annular grooves 213. This dispersion helps to reduce wear between the positioning rod 21 and the limiting sleeve 12, extending their service life.

[0043] Reference Figure 7 and Figure 8 Four staggered guide blocks 13 are fixed to the bottom side of the upper mold 1 by screws. The cross-sectional dimensions of the guide blocks 13 decrease along the direction closer to the lower mold 2. At the same time, a placement groove 23 corresponding to the guide blocks 13 is opened on the lower mold 2. A support block 24 is fixed to the bottom side of the placement groove 23 of the lower mold 2 by screws. A guide slot 241 for the guide blocks 13 to be inserted is opened on the support block 24. When the mold is closed, the guide blocks 13 are inserted into the guide slot 241 on the support block 24.

[0044] In other embodiments, the guide block 13 and the support block 24 can be made of magnetic material, and they attract each other when they are inserted.

[0045] The implementation principle of this application embodiment is as follows:

[0046] When the upper mold 1 and the lower mold 2 are closed, the positioning rod 21 is inserted into the corresponding limiting sleeve 12, and the four misaligned guide blocks 13 are inserted into the guide slots 241 on the support block 24, thereby reducing the possibility of the upper mold 1 and the lower mold 2 being tilted or misaligned when they are closed due to external environment (vibration).

[0047] Unless otherwise defined, the terms or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar words used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "one," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An injection molding die for a circuit breaker base, comprising an upper die (1) and a lower die (2), wherein an upper die core (3) is embedded on the bottom side of the upper die (1), and a lower die core (4) is embedded on the upper surface of the lower die (2), wherein the upper die core (3) and the lower die core (4) abut against each other to form an injection cavity; the upper die (1) is provided with a flow channel communicating with the injection cavity, and the lower die (2) is provided with a pusher assembly (5) and a folding assembly (6); Its features are, The upper surface of the lower mold (2) is fixed with a plurality of positioning rods (21), and the bottom side of the upper mold (1) is provided with positioning slots (11) corresponding to the positioning rods (21). The interior of the positioning slots (11) is fixed with limiting sleeves (12) for the positioning rods (21) to be inserted. The upper mold (1) has a plurality of guide blocks (13) fixedly mounted on its bottom side. The lower mold (2) has a placement groove (23) on its top side. The lower mold (2) has a support block (24) fixedly mounted on the bottom side of the placement groove (23). The support block (24) has a guide slot (241) for the guide blocks (13) to be inserted into its top side. The plurality of guide blocks (13) are staggered on the bottom side of the upper mold (1). The cross-sectional dimensions of the guide blocks (13) decrease along the direction closer to the lower mold (2).

2. The injection molding die for a circuit breaker base according to claim 1, characterized in that, The positioning rod (21) has several annular grooves (213) evenly distributed around its own axis on its outer periphery.

3. The injection molding die for a circuit breaker base according to claim 2, characterized in that, The cross-sectional shape of the annular groove (213) is semi-circular.

4. The injection molding die for a circuit breaker base according to claim 1, characterized in that, A limiting ring (121) is fixed on the outer periphery of the end of the limiting sleeve (12) away from the lower mold (2), and a limiting ring groove (111) is opened on the inner wall of the positioning slot (11) for the limiting ring (121) to be inserted.

5. The injection molding die for a circuit breaker base according to claim 1, characterized in that, A positioning ring (211) is fixed on the outer periphery of the end of the positioning rod (21) away from the upper mold (1). An installation groove (22) for inserting one end of the positioning rod (21) is provided on the upper surface of the lower mold (2). A positioning ring groove (221) for inserting the positioning ring (211) is provided on the side wall of the installation groove (22).

6. The injection molding die for a circuit breaker base according to claim 1, characterized in that, The end edge of the positioning rod (21) away from the lower mold (2) is a guide arc surface (212), and the inner edge of the opening of the limiting sleeve (12) facing the lower mold (2) is a guide arc surface (122).

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