Mold opening mechanism of injection mold for injection molding accessories

Abstract

The utility model discloses a mold opening mechanism of an injection mold for injection molding accessories, which belongs to the technical field of injection molds, and comprises a top plate, an ejector pin, a cavity, an air inlet nozzle, an air outlet, an inner channel, a reset spring and a telescopic pipe, the T-shaped end of the ejector pin is ejected out of the inner channel along with movement of the ejector plate, the T-shaped end of the ejector pin ejects a formed product on the mold core to be loosened, meanwhile, gas is gently conveyed into the cavity through the gas inlet nozzle, and then the gas sequentially passes through the gas outlet, the gas flow channel, the telescopic pipe and the inner channel till the gas flows out from the outlet end of the inner channel. Compared with the prior art, the mold opening difficulty of the formed product is reduced, so that the percent of pass of the formed product is improved, meanwhile, the mold opening speed of the formed product is increased, the production efficiency of the formed product is improved, and the production cost of the formed product is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a mold opening mechanism of an injection mold for injection molding accessories. Background Art

[0002] Injection molding refers to the process of injecting heated and melted materials into the mold cavity under high pressure, and then cooling and solidifying to obtain a molded product. After the product is formed, it needs to be opened to obtain a qualified molded product.

[0003] The existing method is to remove the product from the mold cavity through the ejection mechanism, but the covering force between the product and the mold core is large, which makes it difficult to open the mold. Especially for deep-cavity products, the product surface is prone to whitening, cracking or deformation, thereby increasing the breakage rate of product production and affecting the working efficiency and production cost of injection molding accessories. Utility Model Content

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is to provide a mold opening mechanism for an injection mold for injection molding accessories;

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a mold opening mechanism for an injection mold for an injection molding accessory, the mold opening mechanism comprising: a movable mold, a fixed mold, a mold cavity and a mold core, and also comprising an ejector plate and an ejector pin, wherein a cavity is provided inside the ejector plate, and an air inlet nozzle and an air outlet are arranged on the ejector plate, and one end of the ejector pin is connected to the inner wall of the cavity through the air outlet, an inner channel is provided inside the mold core, and the other end of the ejector pin is flush with the side surface of the mold core through the inner channel, wherein the end shape of the ejector pin is set to be T-shaped, and a return spring and a telescopic tube are arranged on the outer side of the ejector pin.

[0007] An optimal technical solution of the utility model is that a plurality of reinforcing ribs are arranged in the cavity, and a spacing is arranged between adjacent reinforcing ribs, and the reinforcing ribs are used to improve the structural strength of the top plate.

[0008] The preferred technical solution of the utility model is that the inner side of the T-shaped end of the ejector pin is arranged as an arc surface, and the outlet end of the corresponding inner channel of the core matches with the T-shaped end of the ejector pin.

[0009] An optimal technical solution of the utility model is that a connecting ring is provided on the side of the telescopic tube, and the connecting ring is threadedly connected to the top plate or the core.

[0010] The preferred technical solution of the utility model is that a push plate is arranged on the core, a movable plate is arranged between the push plate and the movable mold, and the movable plate can freely adapt to the distance between the push plate and the movable mold.

[0011] The preferred technical solution of the utility model is that the plurality of movable plates are evenly arranged around the push plate, and a limiting groove is provided on the movable plate, and a connecting rod is slidably connected in the limiting groove, and the end of the connecting rod passes through the limiting groove and is threadedly connected to the side of the push plate.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model provides a mold opening mechanism for an injection mold for an injection molding accessory, which comprises an ejector plate, an ejector pin, a cavity, an air inlet nozzle, an air outlet, an inner channel, a return spring and a telescopic tube; the T-shaped end of the ejector pin ejects out of the inner channel as the ejector plate moves, and the T-shaped end of the ejector pin pushes the molded product on the core to loosen, and at the same time, the gas is smoothly transported into the cavity through the air inlet nozzle, and then the gas passes through the air outlet, the air flow channel, the telescopic tube and the inner channel in sequence until it flows out from the outlet end of the inner channel, so that the gas flows between the molded product and the core. Compared with the prior art, the utility model reduces the mold opening difficulty of the molded product, thereby improving the qualified rate of the molded product, and is also conducive to improving the mold opening speed of the molded product, improving the production efficiency of the molded product, and reducing the production cost of the molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the relevant structure of the mold opening mechanism provided in the specific implementation mode of the utility model;

[0015] Figure 2 yes Figure 1 A partial enlarged view of the middle part;

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0017] 1. Moving mold; 11. Fixed mold; 12. Cavity; 13. Core; 2. Ejector plate; 21. Cavity; 22. Air inlet nozzle; 23. Air outlet; 24. Inner channel; 25. Return spring; 26. Telescopic tube; 27. Ejector pin; 3. Reinforcing rib; 4. Connecting ring; 5. Push plate; 6. Movable plate; 61. Limiting groove; 62. Connecting rod. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0019] A mold opening mechanism for an injection mold for an injection molding accessory, the mold opening mechanism comprising: a movable mold 1, a fixed mold 11, a cavity 12 and a core 13, and also comprising an ejector plate 2 and an ejector pin 27, wherein a cavity 21 is formed inside the ejector plate 2, and an air inlet nozzle 22 and an air outlet 23 are provided on the ejector plate 2, and one end of the ejector pin 27 is connected to the inner wall of the cavity 21 through the air outlet 23, an inner channel 24 is formed inside the core 13, and the other end of the ejector pin 27 is flush with the side surface of the core 13 through the inner channel 24, wherein the end shape of the ejector pin 27 is set to be T-shaped, and a return spring 25 and a telescopic tube 26 are provided on the outer side of the ejector pin 27;

[0020] like Figure 1-2 As shown, a cavity 12 is opened in the movable mold 1, and a core 13 is installed on the fixed mold 11. An ejection space is set between the core 13 and the fixed mold 11, and the ejector plate 2 is set in the ejection space. When the mold is opened, the existing ejector column will penetrate into the ejection space to make the ejector plate 2 move in the ejection space. The specific working principle is the same as the existing one, so it will not be described in detail here.

[0021] Among them, the telescopic tube 26 and the return spring 25 are located in the ejection space, and the diameters of the air outlet 23 on the ejector plate 2 and the inner channel 24 of the core 13 are larger than the diameter of the ejector pin 27, so that an air flow channel is formed between the ejector pin 27 and the inner wall of the ejector plate 2 or the inner channel 24, and a plurality of ejector pins 27 are arranged on the ejector plate 2, one end of the ejector pin 27 is fixedly connected to the fixed mold 11, and the shape of the other end is set to be T-shaped. When the mold is pressed, the T-shaped end of the ejector pin 27 is flush with the side of the core 13, and the end is tightly closed with the outlet end of the inner channel 24, so as to reduce the situation of indentation on the surface of the molded product;

[0022] When the molded product is cooled and the mold is opened, the ejector plate 2 moves to make the multiple ejector pins 27 move in the corresponding inner channels 24 respectively. First, the T-shaped end of the ejector pin 27 pushes out of the inner channel 24, so that the outlet end of the inner channel 24 is in an open state, and the T-shaped end of the ejector pin 27 pushes the molded product on the core 13 to loosen. At the same time, the external air pump transports the gas smoothly through the air inlet nozzle 22 to the cavity 21 through the air pipe, and then the gas flows into the air flow channel through the air outlet 23, and then flows into the air flow channel in the fixed mold 11 along the telescopic tube 26, and finally flows out through the outlet end of the inner channel 24, so that the gas flows between the molded product and the core 13;

[0023] Compared with the prior art, the utility model reduces the difficulty of mold opening for molded products, thereby improving the qualified rate of molded products. It is also beneficial to increase the mold opening speed of molded products, improve the production efficiency of molded products, and reduce the production cost of molded products.

[0024] As a possible implementation of this solution, preferably, Figure 1-2As shown, a plurality of reinforcing ribs 3 are arranged in the cavity 21, and a spacing is arranged between adjacent reinforcing ribs 3, and the reinforcing ribs 3 are used to improve the structural strength of the top plate 2;

[0025] Part of the reinforcing ribs 3 is arranged near the air outlet 23. By arranging the reinforcing ribs 3, the structural strength of the entire top plate 2 is improved, and the contact parts of the telescopic tube 26 and the return spring 25 with the top plate 2 are reduced due to damage and bending due to force when the ejector pin 27 pushes a large-scale molded product, thereby facilitating the normal operation of the top plate 2 and helping to extend the service life of the top plate 2.

[0026] As a possible implementation of this solution, preferably, Figure 1 As shown, the inner side of the end of the T-shaped ejector pin 27 is set as a curved surface, and the outlet end of the corresponding inner channel 24 of the core 13 is matched with the T-shaped end of the ejector pin 27;

[0027] The T-shaped end of the ejector pin 27 can be tightly fitted with the outlet end of the inner channel 24 to reduce air leakage or defects on the surface of the molded product; at the same time, the inner side of the T-shaped end of the ejector pin 27 and the outlet end of the inner channel 24 form an arc-shaped channel that bends toward the surroundings. The arc-shaped channel has a guiding effect on the gas, which is convenient for guiding the gas to diffuse toward the surroundings, so that the gas is evenly distributed between the molded product and the cavity 12, which is beneficial to speeding up the mold opening speed of the molded product. In addition, the arc-shaped portion of the arc-shaped channel can buffer the impact of gas flow and reduce the damage of the gas flow rate to the surface of the molded product.

[0028] As a possible implementation of this solution, preferably, Figure 2 As shown, a connecting ring 4 is provided on the side of the telescopic tube 26, and the connecting ring 4 is threadedly connected to the top plate 2 or the core 13;

[0029] The connecting ring 4 is fixedly connected to the end of the telescopic tube 26 and is located at both ends of the telescopic tube 26. By rotating the connecting ring 4, it is convenient to regularly replace the telescopic tube 26 to ensure the air tightness of the telescopic tube 26, thereby ensuring that the gas flows normally into the inner channel 24 of the core 13, which is conducive to the normal gas-assisted molding product mold opening.

[0030] As a possible implementation of this solution, preferably, Figure 1 As shown, a push plate 5 is provided on the core 13, and a movable plate 6 is provided between the push plate 5 and the movable mold 1, and the movable plate 6 can freely adapt to the distance between the push plate 5 and the movable mold 1;

[0031] Before the mold is opened, the push plate 5 fits tightly against the side of the core 13. During the molding process, part of the plastic material is squeezed onto the push plate 5. When the mold is opened, the edge of the molded product is located on the push plate 5. As the cavity 12 separates from the core 13, the movable mold 1 drives the push plate 5 away from the side of the core 13 through the movable plate 6, so that the push plate 5 drives other parts to separate from the core 13 through the edge of the molded product, thereby assisting the mold opening of the molded product and further improving the mold opening speed.

[0032] As a possible implementation of this solution, preferably, Figure 1 As shown, a plurality of movable plates 6 are evenly arranged around the push plate 5, and a limiting groove 61 is provided on the movable plate 6, and a connecting rod 62 is slidably connected in the limiting groove 61, and the end of the connecting rod 62 passes through the limiting groove 61 and is threadedly connected to the side surface of the push plate 5;

[0033] When the cavity 12 is separated from the core 13, the connecting rod 62 slides correspondingly in the limit groove 61, and the multiple movable plates 6 are evenly distributed to limit the moving direction of the push plate 5 and reduce the deviation of the push plate 5 during movement. At the same time, the connecting rod 62 is threadedly connected to the side of the push plate 5, which is conducive to the later installation and maintenance of the push plate 5.

[0034] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A mold opening mechanism for an injection mold for an injection molded part, the mold opening mechanism comprising: A movable mold (1), a fixed mold (11), a cavity (12) and a core (13), characterized in that it also includes a top plate (2) and an ejector pin (27), wherein a cavity (21) is provided inside the top plate (2), and an air inlet nozzle (22) and an air outlet (23) are provided on the top plate (2), and one end of the ejector pin (27) is connected to the inner wall of the cavity (21) through the air outlet (23), an inner channel (24) is provided inside the core (13), and the other end of the ejector pin (27) is flush with the side surface of the core (13) through the inner channel (24), wherein the end shape of the ejector pin (27) is set to be T-shaped, and a return spring (25) and a telescopic tube (26) are provided on the outer side of the ejector pin (27).

2. The mold opening mechanism for an injection mold for an injection molded part according to claim 1, characterized in that: A plurality of reinforcing ribs (3) are arranged in the cavity (21), and a spacing is arranged between adjacent reinforcing ribs (3). The reinforcing ribs (3) are used to improve the structural strength of the top plate (2).

3. The mold opening mechanism for an injection mold for an injection molded part according to claim 1, characterized in that: The inner side of the T-shaped end of the ejector pin (27) is arranged as a curved surface, and the outlet end of the corresponding inner channel (24) of the core (13) matches the T-shaped end of the ejector pin (27).

4. The mold opening mechanism for an injection mold for an injection molded part according to claim 1, characterized in that: A connecting ring (4) is provided on the side of the telescopic tube (26), and the connecting ring (4) is threadedly connected to the top plate (2) or the core (13).

5. The mold opening mechanism for an injection mold for an injection molded part according to claim 1, characterized in that: A push plate (5) is arranged on the core (13), and a movable plate (6) is arranged between the push plate (5) and the movable mold (1), and the movable plate (6) can freely adapt to the distance between the push plate (5) and the movable mold (1).

6. The mold opening mechanism for an injection mold for an injection molded part according to claim 5, characterized in that: A plurality of movable plates (6) are evenly arranged around the push plate (5), and a limiting groove (61) is provided on the movable plate (6), and a connecting rod (62) is slidably connected in the limiting groove (61), and the end of the connecting rod (62) passes through the limiting groove (61) and is threadedly connected to the side of the push plate (5).

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