An injection mold

Abstract

The utility model relates to an injection mold, including front mould subassembly and back mould subassembly, and the front mould subassembly includes front mould base and pressing piece, and the pressing piece fixedly connected at the bottom of front mould base, back mould subassembly includes back mould base, first forming piece, second forming piece and differential mechanism, be equipped with forming cavity on back mould base, and first forming piece and second forming piece all are located at the outside of forming cavity, and with back mould base sliding connection, differential mechanism is installed on back mould base, and first forming piece and second forming piece all are linked with differential mechanism transmission drive, and the pressing piece is used to drive first forming piece to slide, and through differential mechanism can drive second forming piece and first forming piece along the same direction sliding, and the sliding speed of second forming piece is faster than the sliding speed of first forming piece, the utility model can effectively reduce the part needed in the injection mold, and save the space of injection mold.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to an injection mold. Background Technology

[0002] Injection molds are tools used for injection molding, a method of producing industrial plastic products. Injection molding is a process in which plastic (such as plastic granules or fibers) is heated to a molten state. The molten plastic is then injected into a mold using an injection molding machine. After cooling, the material solidifies into the desired shape and size. Simply put, this process involves melting solid material into a liquid, placing it in a fixed mold, and waiting for it to cool and solidify before removing it.

[0003] When existing injection molds are used to form the side structure (recesses or protrusions) of a product, a side core-pulling mechanism is usually required, such as the technical solution disclosed in Chinese patent document CN105082472A. However, when the depth of the recesses or protrusions on the side of the product is too large, the stroke of the side core-pulling mechanism is too long, resulting in an excessively large mold structure and increased mold production costs.

[0004] Therefore, it is necessary to provide a technical solution to address the above problems. Utility Model Content

[0005] This utility model provides an injection mold that aims to solve the problem that when the depth of the concave or convex part on the side of the existing product is too large, the stroke of the side core pulling mechanism must be long, resulting in an excessively large mold structure and increased mold production costs.

[0006] To achieve the above objectives, this utility model provides an injection mold, including a front mold assembly and a rear mold assembly, wherein:

[0007] The front mold assembly includes a front mold base and a pressure member, wherein the pressure member is fixedly connected to the bottom of the front mold base;

[0008] The rear mold assembly includes a rear mold base, a first molding component, a second molding component, and a differential transmission mechanism. The rear mold base is provided with a molding cavity. The first molding component and the second molding component are both located outside the molding cavity and are slidably connected to the rear mold base. The differential transmission mechanism is installed on the rear mold base, and the first molding component and the second molding component are both connected to the differential transmission mechanism in a driving manner.

[0009] The pressing element is used to drive the first molded part to slide. The differential transmission mechanism can drive the second molded part to slide in the same direction as the first molded part, and the sliding speed of the second molded part is faster than that of the first molded part.

[0010] In some embodiments, the differential transmission mechanism includes a first gear, which includes a first tooth portion and a second tooth portion that are fixedly connected and coaxially arranged. The pitch circle diameter of the second tooth portion is larger than that of the first tooth portion. A first rack is provided on the side end of the first molded part, and a second rack is provided on the side end of the second molded part. The first rack meshes with the first tooth portion, and the second rack meshes with the second tooth portion.

[0011] In some embodiments, the first tooth and the second tooth are integrally formed.

[0012] In some embodiments, the differential transmission mechanism includes a second gear that meshes with the second tooth portion, and a second rack that meshes with the second gear.

[0013] In some embodiments, the first molded part has an inclined surface on the side away from the molding cavity, and the pressure member abuts against the inclined surface; a spring is installed on the rear mold base to drive the first molded part to move away from the molding cavity.

[0014] In some embodiments, a wear-resistant block is fixedly connected to the first molded part, and the wear-resistant block is in contact with the pressing part.

[0015] In some embodiments, the first molded part has an oblique guide hole, and a guide rod is mounted on the front mold base, the guide rod passing through the guide hole.

[0016] In some embodiments, the injection mold further includes an ejection assembly for demolding the product.

[0017] The technical effect of the injection mold involved in this utility model is as follows:

[0018] This application utilizes a differential transmission mechanism to enable a first molding part that only needs short-distance movement to drive a second molding part that needs long-distance movement. In this way, there is no need to add a pressure member on the outside of the second molding part to drive its movement, which effectively reduces the space required for the mold at the second molding part and lowers the production cost of the mold. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an injection mold involved in this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the rear mold assembly in an injection mold according to the present invention;

[0021] Figure 3 This is a schematic diagram showing the cooperation between the first molding part, the second molding part, and the differential transmission mechanism in an injection mold according to this utility model;

[0022] Figure 4 This is a schematic diagram illustrating the fit between the pressure component and the first molding seat in an injection mold according to this utility model.

[0023] Figure 5 This is a schematic diagram of the differential transmission mechanism in an injection mold involved in this utility model.

[0024] Marked in the image:

[0025] 1. Front mold assembly; 2. Rear mold assembly; 3. Ejection assembly;

[0026] 11. Front mold base; 12. Pressing part; 13. Guide rod;

[0027] 21. Rear mold base; 22. First molding part; 221. First rack; 23. Second molding part; 231. Second rack; 24. Differential transmission mechanism; 241. First gear; 2411. First tooth; 2412. Second tooth; 242. Second gear; 25. Wear-resistant block. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component at the same time; when a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intervening component at the same time.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In the description of the embodiments of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of this utility model and simplifying the description, and does 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. Therefore, it should not be construed as a limitation of this utility model.

[0032] To more clearly illustrate the technical solution of this utility model, a preferred embodiment is provided below for reference. Figures 1-5 An injection mold includes a front mold assembly 1 and a rear mold assembly 2, wherein:

[0033] The front mold assembly 1 includes a front mold base 11 and a pressure member 12, with the pressure member 12 fixedly connected to the bottom of the front mold base 11;

[0034] The rear mold assembly 2 includes a rear mold base 21, a first molding part 22, a second molding part 23, and a differential transmission mechanism 24. The rear mold base 21 is provided with a molding cavity. The first molding part 22 and the second molding part 23 are both located outside the molding cavity and are slidably connected to the rear mold base 21. The differential transmission mechanism 24 is installed on the rear mold base 21, and the first molding part 22 and the second molding part 23 are both connected to the differential transmission mechanism 24 for transmission.

[0035] The pressing member 12 is used to drive the first molding member 22 to slide. Through the differential transmission mechanism 24, the second molding member 23 can be driven to slide in the same direction as the first molding member 22, and the sliding speed of the second molding member 23 is faster than that of the first molding member 22.

[0036] It should be noted that the first molding part 22 has a first side cavity, and the second molding part 23 has a second side cavity. The length of the first side cavity is less than the length of the second side cavity. Therefore, when the mold is opened, the sliding distance required for the second molding part 23 is greater than the moving distance of the first molding part 22. The working process of the injection mold involved in this embodiment is as follows: when the front mold assembly 1 and the rear mold assembly 2 move relative to each other to open the mold, the pressure member 12 drives the first molding part 22 to slide away from the molding cavity. When the first molding part 22 moves, the second molding part 23 will move simultaneously under the action of the differential transmission mechanism 24, and the moving speed is greater than the moving speed of the first molding part 22. Thus, when the first molding part 22 is demolded, the second molding part 23 will also be demolded. This design differs from the traditional side core-pulling mechanism of injection molds in that it can move two molded parts using a single pressure member 12. There is no need for another pressure member 12 on the outside of the second molded part 23, which effectively saves the space required for the mold at the second molded part 23 and thus reduces the production cost of the mold.

[0037] In some embodiments, the differential transmission mechanism 24 includes a first gear 241, which includes a first tooth portion 2411 and a second tooth portion 2412 fixedly connected and coaxially arranged. The pitch circle diameter of the second tooth portion 2412 is larger than that of the first tooth portion 2411. A first rack 221 is provided on the side end of the first molded part 22, and a second rack 231 is provided on the side end of the second molded part 23. The first rack 221 meshes with the first tooth portion 2411, and the second rack 231 meshes with the second tooth portion 2412. Preferably, the number of teeth in the first tooth portion 2411 is less than the number of teeth in the second tooth portion 2412, and the tooth pitch of the first tooth portion 2411 is the same as that of the second tooth portion 2412. In practical applications, when the first molded part 22 moves, the first rack 221 will drive the first tooth 2411 to rotate. At this time, the second tooth 2412 will rotate accordingly, and then drive the second molded part 23 to move through the second rack 231. Since the pitch circle diameter of the second tooth 2412 is larger than the pitch circle diameter of the first tooth 2411, a movement difference will be generated between the second molded part 23 and the first molded part 22.

[0038] In some embodiments, the first tooth 2411 and the second tooth 2412 are integrally formed, which simplifies the assembly process of the injection mold.

[0039] In some embodiments, the differential transmission mechanism 24 includes only the first gear 241. In this case, the first rack 221 and the second rack 231 are located on the same side. A rectangular frame structure needs to be provided on the second molded part 23 so that the first gear 241 is located within the rectangular frame structure, so that the first molded part 22 and the second molded part 23 located on both sides of the differential transmission mechanism 24 can slide in the same direction.

[0040] In some embodiments, the differential transmission mechanism 24 includes a second gear 242 that meshes with a second tooth 2412, and a second rack 231 that meshes with the second gear 242. Based on this design, the first rack 221 and the second rack 231 can be distributed on both sides of the first gear 241, and the second molded part 23 does not need to have a rectangular structure, reducing the manufacturing difficulty of the second molded part 23.

[0041] In some embodiments, the first molded part 22 has an inclined surface on the side away from the molding cavity, and the pressure member 12 abuts against the inclined surface; a spring is installed on the rear mold base 21 to drive the first molded part 22 to move away from the molding cavity. For details, please refer to the side core pulling mechanism disclosed in Chinese Patent Document No. CN105082472A, which will not be described in detail here.

[0042] In some embodiments, a wear-resistant block 25 is fixedly connected to the first molded part 22, and the wear-resistant block 25 is in contact with the pressure part 12. The addition of the wear-resistant block 25 can extend the service life of the pressure part 12 and the first molded part 22.

[0043] In some embodiments, an oblique guide hole is formed on the first molded part 22, and a guide rod 13 is mounted on the front mold base, passing through the guide hole. The addition of the guide rod 13 and the guide hole can improve the sliding stability of the first molded part 22.

[0044] In some embodiments, the injection mold also includes an ejection assembly 3 for demolding the product.

[0045] The above are merely preferred embodiments of the present utility model, and its structure is not limited to the shapes listed above. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An injection mold, comprising a front mold assembly and a rear mold assembly, characterized in that: The front mold assembly includes a front mold base and a pressure member, wherein the pressure member is fixedly connected to the bottom of the front mold base; The rear mold assembly includes a rear mold base, a first molding component, a second molding component, and a differential transmission mechanism. The rear mold base is provided with a molding cavity. The first molding component and the second molding component are both located outside the molding cavity and are slidably connected to the rear mold base. The differential transmission mechanism is installed on the rear mold base, and the first molding component and the second molding component are both connected to the differential transmission mechanism in a driving manner. The pressing element is used to drive the first molded part to slide. The differential transmission mechanism can drive the second molded part to slide in the same direction as the first molded part, and the sliding speed of the second molded part is faster than that of the first molded part.

2. An injection mold as claimed in claim 1, characterized in that: The differential transmission mechanism includes a first gear, which includes a first tooth portion and a second tooth portion that are fixedly connected and coaxially arranged. The pitch circle diameter of the second tooth portion is larger than that of the first tooth portion. A first rack is provided on the side end of the first molded part, and a second rack is provided on the side end of the second molded part. The first rack meshes with the first tooth portion, and the second rack meshes with the second tooth portion.

3. The injection mold as described in claim 2, characterized in that: The first tooth and the second tooth are integrally formed.

4. The injection mold as described in claim 2, characterized in that: The differential transmission mechanism includes a second gear, which meshes with the second tooth portion, and a second rack meshes with the second gear.

5. The injection mold of claim 1, wherein: The first molded part has an inclined surface on the side away from the molding cavity, and the pressure member abuts against the inclined surface; a spring is installed on the rear mold base to drive the first molded part to move away from the molding cavity.

6. The injection mold of claim 5, wherein: A wear-resistant block is fixedly connected to the first molded part, and the wear-resistant block is in contact with the pressing part.

7. The injection mold of claim 1, wherein: The first molded part has an oblique guide hole, and a guide rod is installed on the front mold base, the guide rod passing through the guide hole.

8. The injection mold as described in claim 1, characterized in that: The injection mold also includes an ejection assembly for demolding the product.

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