Pre-pumping mechanism for preventing vacuum adsorption mold sticking

Abstract

The utility model belongs to the technical field of injection molds, and particularly relates to a pre-pumping mechanism for preventing vacuum adsorption mold sticking, which comprises a fixed mold seat plate, the lower side of the fixed mold seat plate is vertically connected with a fixed mold plate in a sliding manner, an elastic reset piece is arranged between the fixed mold seat plate and the fixed mold plate, and a fixed mold insert is arranged in the fixed mold plate; a mold cavity is formed in the fixed mold insert, a sprue bush and a plastic part which are located on the upper side of the fixed mold insert are fixedly connected to the fixed mold seat plate, a screw mounting groove is formed in the fixed mold seat plate, an equal-height screw vertically slides in the screw mounting groove, the lower end of the equal-height screw is fixedly connected with the fixed mold plate, and the elastic reset part is a return spring. A spring mounting groove is formed in the upper side of the fixed mold plate, and the return spring is mounted in the spring mounting groove. According to the utility model, the top of the plastic part can be communicated with the outside, the mold sticking phenomenon of the plastic part caused by vacuum adsorption is reduced, the mold sticking risk of the plastic part is reduced, and the product percent of pass is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and particularly relates to a pre-extraction mechanism for preventing vacuum adsorption and mold sticking. Background Art

[0002] With the development of injection mold technology and the maturity of processing technology, higher requirements are placed on the structure and size of plastic parts; deep cavity, low demoulding angle and high requirements on the surface of plastic parts all pose higher challenges to the mold;

[0003] At the current technical level, in order to solve the demoulding problem of deep-cavity plastic parts, most of them adopt the method of adding undercuts to the rear mold to increase the pulling force of the rear mold on the product. This method can easily damage or even crack the product, which is not allowed for some optical parts. At the same time, after adding undercuts to the rear mold, it is necessary to add a process of removing the undercuts. Some products cannot even be added due to structural reasons, so vacuum adsorption is needed to increase the pulling force on the product.

[0004] Vacuum adsorption occurs because the outer surface of the product is entirely within the mold cavity and cannot communicate with the external atmospheric pressure, generating negative pressure, which causes the product to be adsorbed on the rear mold (i.e., the fixed mold insert). Under the influence of negative pressure, plastic parts are prone to mold sticking due to vacuum adsorption, increasing the risk of mold sticking and reducing the product qualification rate. Utility Model Content

[0005] The purpose of the utility model is to provide a pre-extraction mechanism for preventing mold sticking due to vacuum adsorption, which can ensure that the top of the plastic part is connected to the outside world, reduce the mold sticking phenomenon caused by vacuum adsorption of the plastic part, reduce the risk of mold sticking of the plastic part, and greatly improve the product qualification rate.

[0006] The technical solutions adopted in this utility are as follows:

[0007] A pre-extraction mechanism for preventing mold sticking due to vacuum adsorption comprises a fixed mold base plate, the lower side of which is vertically slidably connected to a fixed mold plate, an elastic reset part is installed between the fixed mold base plate and the fixed mold plate, a fixed mold insert is installed inside the fixed mold plate, a mold cavity is opened inside the fixed mold insert, and a gate sleeve and a plastic part located on the upper side of the fixed mold insert are fixedly connected to the fixed mold base plate.

[0008] Furthermore, a screw installation groove is provided inside the fixed mold base plate, and a height-conforming screw is vertically slid inside the screw installation groove, and the lower end of the height-conforming screw is fixedly connected to the fixed mold plate.

[0009] Furthermore, the elastic return member is a return spring, a spring installation groove is provided on the upper side of the fixed template, and the return spring is installed inside the spring installation groove.

[0010] Furthermore, a mounting cavity is provided inside the fixed mold plate, the fixed mold insert is inserted into the mounting cavity, and the fixed mold insert is fixedly connected to the fixed mold plate by a hexagon socket screw.

[0011] The technical effects achieved by this utility model are:

[0012] The utility model discloses a pre-extraction mechanism for preventing mold sticking due to vacuum adsorption, which can ensure that the top of the plastic part is connected to the outside world by arranging a return spring between the fixed mold base plate and the fixed mold plate, thereby reducing the mold sticking phenomenon of the plastic part caused by vacuum adsorption, reducing the mold sticking risk of the plastic part, and greatly improving the product qualification rate. The mechanism has been widely used in such products. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model in the mold closing state;

[0014] Figure 2 This is a practical Figure 1 A partial enlarged view of the middle A;

[0015] Figure 3 It is a structural schematic diagram of the present invention in the mold opening state.

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

[0017] 1. Fixed mold base plate; 2. Return spring; 3. Fixed mold plate; 4. Fixed mold insert; 5. Hexagon socket screw 1; 6. Contour screw; 7. Hexagon socket screw 2; 8. Hexagon socket screw 3; 9. Gate sleeve; 10. Plastic part; 11. Fixed mold insert; 12. Screw mounting slot. DETAILED DESCRIPTION

[0018] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with the embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0019] like Figure 1-3 As shown, a pre-extraction mechanism for preventing mold sticking due to vacuum adsorption comprises a fixed mold base plate 1, which can be fixed on an injection molding machine. The lower side of the fixed mold base plate 1 is vertically slidably connected with a fixed mold plate 3, so that there is a certain movable space between the fixed mold base plate 1 and the fixed mold plate 3, and an elastic reset component is installed between the fixed mold base plate 1 and the fixed mold plate 3. When the mold is used, the elastic reset component makes the fixed mold base plate 1 and the fixed mold plate 3 move away from each other first, thereby ensuring that the top of the plastic part 10 is connected to the outside world and reducing the mold sticking caused by vacuum adsorption.

[0020] Among them, Figure 1-2As shown, a screw installation groove 12 is opened inside the fixed mold base plate 1, and an equal height screw 6 is vertically slid inside the screw installation groove 12. The lower end of the equal height screw 6 is fixedly connected to the fixed mold plate 3, and the vertical movement distance of the equal height screw 6 is T1. Through the setting of the equal height screw 6, a movable space with a height of T1 can be generated between the fixed mold base plate 1 and the return spring 2.

[0021] And, if Figure 1 As shown, the elastic return member can be a combination of two magnets or a return spring 2. In the present technical solution, the return spring 2 is preferred, and a spring mounting groove can be opened on the upper side of the fixed mold plate 3. The return spring 2 is installed inside the spring mounting groove, thereby reducing the influence of the return spring 2 on the fixed mold base plate 1 and the fixed mold plate 3 when the mold is closed.

[0022] like Figure 1-3 As shown, a fixed mold insert 4 is installed inside the fixed mold plate 3, and a mold cavity is opened inside the fixed mold insert 4. A gate sleeve 9 and a plastic part 10 located on the upper side of the fixed mold insert 4 are fixedly connected to the fixed mold base plate 1. When the fixed mold insert 4 and the fixed mold insert 11 are molded, the injection molding machine injects plastic into the mold cavity through the gate sleeve 9. When the ejection temperature is reached, the mold is opened and the plastic part 10 can be processed and formed. After the mold is opened, the fixed mold plate 3 together with the fixed mold insert 4 can be separated from the fixed mold base plate 1 by a gap of T1 under the action of the return spring 2.

[0023] For details, please refer to Figure 1 and Figure 3 As shown, a mounting cavity is provided inside the fixed mold plate 3, and the fixed mold insert 4 is inserted into the mounting cavity. The fixed mold insert 4 is fixedly connected to the fixed mold plate 3 by a hexagon socket screw 5 to ensure stability.

[0024] Similarly, if Figure 1 and Figure 3 As shown, the gate sleeve 9 is fixedly connected to the fixed mold base plate 1 by the hexagon socket screw 3 8, and the fixed mold insert 11 is fixedly connected to the fixed mold base plate 1 by the hexagon socket screw 2 7, which can have good stability.

[0025] The working principle of the utility model is as follows: the fixed mold base plate 1 is driven downward by the injection molding machine to allow the fixed mold insert 11 and the fixed mold block 4 to enter the mold closing state, and then the plastic is injected into the mold cavity through the gate sleeve 9. When the ejection temperature is reached, the mold is opened and the plastic part 10 can be processed and formed. After the mold is opened, the fixed mold plate 3 together with the fixed mold insert 4 can be separated from the fixed mold base plate 1 by a gap of T1 under the action of the return spring 2. Since the fixed mold base plate 1 and the fixed mold plate 3 are separated first due to the return spring 2, it is ensured that the top of the plastic part 10 is connected to the outside world, and the sticking mold phenomenon caused by vacuum adsorption is reduced.

[0026] In summary, the technical solution can ensure that the top of the plastic part 10 is connected to the outside world by setting a return spring 2 between the fixed mold base plate 1 and the fixed mold plate 3, thereby reducing the mold sticking phenomenon of the plastic part 10 caused by vacuum adsorption, reducing the mold sticking risk of the plastic part 10, and greatly improving the product qualification rate. This mechanism has been widely used in such products.

[0027] The above is only a preferred embodiment of the present invention. It should be noted that, for ordinary technicians in the field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A pre-extraction mechanism for preventing mold sticking due to vacuum adsorption, comprising a fixed mold base plate (1), characterized in that: The lower side of the fixed mold base plate (1) is vertically slidably connected to a fixed mold plate (3); an elastic reset member is installed between the fixed mold base plate (1) and the fixed mold plate (3); a fixed mold insert (4) is installed inside the fixed mold plate (3); a mold cavity is provided inside the fixed mold insert (4); and a gate sleeve (9) and a plastic part (10) located on the upper side of the fixed mold insert (4) are fixedly connected to the fixed mold base plate (1).

2. The vacuum suction mechanism for preventing mold sticking according to claim 1, characterized in that: The interior of the fixed mold base plate (1) is provided with a screw installation groove (12), and a height-conforming screw (6) is vertically slidable inside the screw installation groove (12), and the lower end of the height-conforming screw (6) is fixedly connected to the fixed mold plate (3).

3. The pre-extraction mechanism for preventing mold sticking by vacuum adsorption according to claim 1, characterized in that: The elastic return element is a return spring (2).

4. The pre-extraction mechanism for preventing mold sticking by vacuum adsorption according to claim 3 is characterized in that: A spring installation groove is provided on the upper side of the fixed template (3), and the return spring (2) is installed inside the spring installation groove.

5. The pre-extraction mechanism for preventing mold sticking due to vacuum adsorption according to claim 1, characterized in that: The fixed mold plate (3) has an installation cavity formed inside, the fixed mold insert (4) is inserted into the installation cavity, and the fixed mold insert (4) is fixedly connected to the fixed mold plate (3) by means of a hexagon socket screw (5).

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