Injection mold capable of preventing screw column of product from being pressed to be concave

Abstract

The utility model provides an injection mold for preventing a screw column of a product from being jacked to be concave, which comprises a rear mold core, a groove for placing the product is arranged at the top of the rear mold core, a plurality of groups of ejection components are arranged at the bottom of the rear mold core, each ejection component comprises an ejector sleeve inner needle, and the top of each ejector sleeve inner needle is arranged in one group of product screw columns at the bottom of the product in a penetrating manner; the outer side of the ejector sleeve inner needle is sleeved with a slidable ejector sleeve, the top end of the ejector sleeve is in contact with a product screw column, and the bottom of the ejector sleeve inner needle is arranged in the delay sleeve in a penetrating mode; through the arrangement of the ejector sleeve inner needle and the ejector sleeve sleeve, the ejector sleeve inner needle firstly ejects a product for a certain distance, so that the wrapping force of the product to the ejector sleeve inner needle is reduced, and then the ejector sleeve is ejected to a final state to complete ejection and demolding of the product, so that the end surface of a screw stud cannot be concaved by ejection; the injection mold solves the problem that the end face of a product stud is prone to being jacked and deformed by a traditional injection mold, the integrity of the product stud is ensured, and the quality and appearance of the product are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and more specifically, particularly relates to an injection mold for preventing the screw posts of a product from being sunken at the top. Background Technique

[0002] Injection molding is a molding process widely used in the manufacturing industry. It is a method of injecting a molten polymer material into a mold and cooling and solidifying it in the mold to obtain the required parts. As an efficient molding technology, injection molding is widely used in many fields such as household appliances, automobiles, and electronics.

[0003] In the entire production process of injection molding, the ejection and demolding step of the product is particularly crucial. Only when the product is successfully ejected from the mold and maintains good appearance quality can the subsequent assembly process proceed smoothly. However, for some products with relatively deep screw post structures, during the ejection action of the conventional ejection mechanism, it is easy to cause the end face of the screw post of the product to be sunken and deformed, which seriously affects the quality and appearance of the product. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides an injection mold for preventing the screw posts of a product from being sunken at the top, so as to solve the technical problem that in the prior art, when the traditional injection mold demolds a product with relatively deep screw posts, during the ejection process of the conventional ejection structure, it is easy to cause the end face of the screw post of the product to be sunken and deformed, thereby affecting the quality and appearance of the product.

[0005] The purpose and efficacy of an injection mold for preventing the screw posts of a product from being sunken at the top of the utility model are achieved by the following specific technical means:

[0006] An injection mold for preventing the screw posts of a product from being sunken at the top includes a rear mold core. A groove for placing the product is arranged at the top of the rear mold core. A plurality of sets of ejection components are arranged at the bottom of the rear mold core. Each ejection component includes an inner needle of a cylinder. The top of the inner needle of the cylinder penetrates through one of the screw posts at the bottom of the product. A slidable cylinder sleeve is sleeved outside the inner needle of the cylinder. The top end of the cylinder sleeve contacts the screw post of the product. The bottom of the inner needle of the cylinder penetrates through a delay sleeve.

[0007] In a preferred embodiment, a B plate is arranged at the bottom of the rear mold core. Two sets of square irons are arranged at the bottom of the B plate. The tops of the two sets of square irons are connected to the same bottom plate.

[0008] In a preferred embodiment, a plurality of sets of through holes are formed in the bottom plate. One of the through holes is fixedly connected to a first fixing block by a screw at the bottom. The bottom end of the delay sleeve penetrates through one of the through holes and contacts the top of the first fixing block.

[0009] In a preferred embodiment, a thimble bottom plate is disposed on the top of the bottom plate, and a thimble face plate is disposed on the top of the thimble bottom plate.

[0010] In a preferred embodiment, through holes corresponding to each other are formed in both the thimble bottom plate and the thimble face plate, and the bottom end of the inner thimble of the ejector sleeve passes through the two groups of through holes and is connected to the delay sleeve.

[0011] In a preferred embodiment, a square groove is formed at the bottom of the through hole on the thimble face plate, a second fixing block is clamped in the square groove, the bottom end of the ejector sleeve passes through the through hole and is connected to the second fixing block, and the bottom of the second fixing block contacts the thimble bottom plate.

[0012] In a preferred embodiment, a front mold core is disposed on the top of the rear mold core, a plate A is disposed on the top of the front mold core, and a face plate is disposed on the top of the plate A.

[0013] Compared with the prior art, the present utility model has the following beneficial effects:

[0014] 1. Through the arrangement of the inner thimble of the ejector sleeve and the ejector sleeve, when using the injection mold, during the ejection process of the thimble bottom plate and the thimble face plate, the inner thimble of the ejector sleeve first ejects a certain distance with the product, so that after the product is separated from the mold core by a certain distance, the inner thimble of the ejector sleeve stops moving due to the action of the delay sleeve, while the ejector sleeve continues to eject with the thimble plate to the final state to complete the ejection and demolding of the product; the clamping force of the product on the inner thimble of the ejector sleeve is reduced, and when the ejector sleeve ejects the product, the end face of the screw post will not be indented, solving the problem that the end face of the screw post of the product in the traditional injection mold is easily indented and deformed, ensuring the integrity of the screw post of the product, improving the quality and appearance of the product, and enhancing the competitiveness of the product in the market.

[0015] 2. Through the arrangement of the ejection assembly, when using the injection mold, on the basis of the traditional injection mold, only a small number of parts such as a delay sleeve and an ejector sleeve are added, the overall structure is relatively simple, no complex mechanical structure and high-precision processing technology are required, the manufacturing cost is low, and it has good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural view of an injection mold for preventing the indentation of the screw post of the product of the present utility model;

[0017] Figure 2 is an exploded view of an injection mold for preventing the indentation of the screw post of the product of the present utility model;

[0018] Figure 3 is a schematic structural view of the assembly of the product and the inner thimble of the ejector sleeve in an injection mold for preventing the indentation of the screw post of the product of the present utility model;

[0019] Figure 4 is Figure 3 The structural schematic diagram after splitting;

[0020] Figure 5 is the structural schematic diagram after the assembly of the bottom plate of the injection mold, the ejector pin bottom plate and the ejector pin panel for preventing the product screw post from being sunken in the present utility model;

[0021] Figure 6 is Figure 5 The structural schematic diagram after splitting;

[0022] Figure 7 is the present utility model Figure 1 The cross-sectional view of A - A in;

[0023] Figure 8 is the present utility model Figure 7 The enlarged schematic diagram of area a in.

[0024] In the figure, the corresponding relationship between the part names and the drawing reference numbers is:

[0025] 11, the rear mold core; 12, the product; 13, the product screw post; 14, the B plate; 15, the square iron; 16, the bottom plate; 17, the ejector pin bottom plate; 18, the ejector pin panel; 21, the inner needle of the ejector sleeve; 22, the ejector sleeve; 23, the delay sleeve; 24, the first fixing block; 25, the second fixing block; 31, the front mold core; 32, the A plate; 33, the panel. Specific embodiments

[0026] The following further describes in detail the embodiments of the present utility model in conjunction with the drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0027] Example:

[0028] As shown in the attached Figure 1 to the attached Figure 6 figures:

[0029] The utility model provides an injection mold for preventing the product screw post from being sunken, which includes a rear mold core 11. A groove for placing the product 12 is arranged at the top of the rear mold core 11. Multiple sets of ejector components are arranged at the bottom of the rear mold core 11. The ejector component includes a thimble inner pin 21 and a slidable thimble sleeve 22 sleeved outside the thimble inner pin 21. The top of the thimble inner pin 21 penetrates through one of the product screw posts 13 at the bottom of the product 12, and the top end of the thimble sleeve 22 is in direct contact with the product screw post 13. The bottom of the thimble inner pin 21 penetrates through a delay sleeve 23. During the ejection process, the thimble inner pin 21 will be ejected outward together with the product 12. However, due to the effect of the delay sleeve 23, the thimble inner pin 21 will immediately stop moving, while the thimble sleeve 22 continues to be ejected outward to the end position to complete the ejection and demolding of the product 12. This secondary ejection mechanism utilizes the clamping effect of the product screw post 13 on the thimble inner pin 21. During the first ejection, due to the clamping force of the product screw post 13, the thimble inner pin 21 will move together with the product 12, thus avoiding the deformation of the end face of the product screw post 13. When the product 12 is completely separated from the rear mold core 11, the thimble inner pin 21 stops moving under the action of the delay sleeve 23, while the thimble sleeve 22 continues to be ejected, and finally the ejection of the product 12 is completed, effectively preventing the deformation of the end face of the product screw post 13. Moreover, the structure is relatively simple, the manufacturing cost is relatively low, and it has good economy.

[0030] Please refer to as Figure 2 shown, a B plate 14 is arranged at the bottom of the rear mold core 11, and two sets of square irons 15 are arranged at the bottom of the B plate 14. The tops of these two sets of square irons 15 are connected to the same bottom plate 16, enhancing the stability of the mold.

[0031] Please refer to as Figure 5 and Figure 6 shown, multiple sets of through holes are opened on the bottom plate 16, providing reliable support for the installation and fixation of the delay sleeve 23. The bottom of one set of through holes is fixed with a first fixing block 24 by screws, and the bottom end of the delay sleeve 23 penetrates through this set of through holes and contacts the top of the first fixing block 24.

[0032] A thimble bottom plate 17 is arranged at the top of the bottom plate 16, and a thimble panel 18 is further arranged at the top of the thimble bottom plate 17. Corresponding through holes are opened on both the thimble bottom plate 17 and the thimble panel 18. The bottom end of the thimble inner pin 21 passes through two sets of corresponding through holes on the thimble bottom plate 17 and the thimble panel 18 and is connected to the delay sleeve 23, enabling the thimble inner pin 21 to slide inside the delay sleeve 23. In addition, a convex block is arranged at the bottom end of the thimble inner pin 21, and the convex block contacts the bottom end of the delay sleeve 23. The top of the thimble inner pin 21 cannot pass through the through hole on the thimble bottom plate 17, thus playing a limiting role and restricting the maximum ejection distance of the thimble inner pin 21.

[0033] During the ejection process of the ejector base plate 17 and the ejector panel 18, the inner thimble 21 of the thimble first ejects a certain distance together with the product 12, causing the clamping force of the product 12 on the inner thimble 21 to gradually decrease; when the product 12 is separated from the rear mold core 11 by a certain distance, the inner thimble 21 will stop under the limiting action of the delay sleeve 23, while the thimble sleeve 22 will continue to eject with the ejector base plate 17 and the ejector panel 18 to the final state, thus completing the ejection and demolding process of the product 12; during the process of the thimble sleeve 22 ejecting the product 12, the end face of the product screw post 13 will not be dented or deformed, solving the problem that the end face of the product screw post 13 is easily dented and deformed by traditional injection molds, ensuring the integrity of the product screw post 13, improving the overall quality and appearance of the product, and enhancing its competitiveness in the market.

[0034] Please refer to Figure 6 As shown in the figure, a square groove is opened at the bottom of the through hole on the ejector panel 18, and a second fixing block 25 is clamped in the square groove. The bottom end of the thimble sleeve 22 passes through this through hole and is connected to the second fixing block 25. At the same time, the bottom of the second fixing block 25 contacts the ejector base plate 17. By using the through hole and the square groove, the thimble sleeve 22 is connected to the ejector base plate 17 through the second fixing block 25, ensuring that the thimble sleeve 22 can drive the ejection along with the movement of the ejector base plate 17 and the ejector panel 18, and can also transfer and disperse the load acting on the thimble sleeve 22. As an intermediate link, the second fixing block 25 enables the thrust from the ejector base plate 17 to be smoothly transmitted to the thimble sleeve 22, avoiding the problem of local stress concentration.

[0035] Please refer to Figure 2 As shown in the figure, a front mold core 31 is provided at the top of the rear mold core 11, an A plate 32 is provided at the top of the front mold core 31, and a panel 33 is provided at the top of the A plate 32.

[0036] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The selection and description of embodiments are intended to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. An injection mold for preventing the screw posts of a product from being sunken, characterized in that: It includes a rear mold core (11). A groove for placing a product (12) is provided at the top of the rear mold core (11). A plurality of ejector assemblies are provided at the bottom of the rear mold core (11). The ejector assembly includes a thimble inner pin (21). The top of the thimble inner pin (21) is inserted into one of the product screw posts (13) at the bottom of the product (12). A slidable thimble sleeve (22) is sleeved outside the thimble inner pin (21). The top end of the thimble sleeve (22) contacts the product screw post (13). The bottom of the thimble inner pin (21) is inserted into a delay sleeve (23).

2. The injection mold for preventing the screw posts of a product from being dented as described in claim 1, wherein: A B plate (14) is provided at the bottom of the rear mold core (11). Two sets of square irons (15) are provided at the bottom of the B plate (14). The tops of the two sets of square irons (15) are connected to the same bottom plate (16).

3. The injection mold for preventing the screw post of the product from being dented as described in claim 2, wherein: A plurality of through holes are formed in the bottom plate (16). The bottom of one of the through holes is fixedly connected to a first fixing block (24) by screws. The bottom end of the delay sleeve (23) is inserted into one of the through holes and contacts the top of the first fixing block (24).

4. An injection mold for preventing the screw posts of a product from being sunken, as described in claim 2, wherein: A ejector pin bottom plate (17) is provided at the top of the bottom plate (16). An ejector pin panel (18) is provided at the top of the ejector pin bottom plate (17).

5. The injection mold for preventing the screw post of a product from being sunken as claimed in claim 4, wherein: Corresponding through holes are formed in both the ejector pin bottom plate (17) and the ejector pin panel (18). The bottom end of the thimble inner pin (21) passes through the two through holes and is connected to the delay sleeve (23).

6. An injection mold for preventing the screw posts of a product from being sunken, as described in claim 5, characterized in that: A square groove is formed at the bottom of the through hole on the ejector pin panel (18). A second fixing block (25) is clamped in the square groove. The bottom end of the thimble sleeve (22) passes through the through hole and is connected to the second fixing block (25). The bottom of the second fixing block (25) contacts the ejector pin bottom plate (17).

7. An injection mold for preventing the screw posts of a product from being sunken, as described in claim 1, characterized in that: A front mold core (31) is provided at the top of the rear mold core (11). An A plate (32) is provided at the top of the front mold core (31). A panel (33) is provided at the top of the A plate (32).

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