A mould structure for injection-moulding a plastic product with a reverse thread on the inner periphery

Abstract

The utility model discloses a kind of mould simplified structure suitable for injection molding glue product internal periphery circle reverse buckling, it is related to plastic product mould simplified structure technical field, including plastic part structure and link block, the bottom middle of plastic part structure is vertically connected with link block, and the bottom of link block is provided with sleeve member, and the inside lower end of sleeve member is vertically installed with bowie needle.The mould simplified structure suitable for injection molding glue product internal periphery circle reverse buckling is provided with link block, sleeve member and bowie needle, by utilizing the mutual cooperation of each structure thereof, after plastic part structure forming, it is convenient to be taken out from mould interior, simultaneously, the device structural member is installed in mould interior, by the design of each structural member, the structure of mould is effectively simplified, and it has the advantages of convenient to use, structure is reliable, production cost is low, processing cycle is short, maintenance is simple, etc., to realize effective practicability.

Description

Technical Field

[0001] This utility model relates to the field of simplified structure technology for plastic product molds, specifically a simplified mold structure suitable for undercutting the internal perimeter of injection molded products. Background Technology

[0002] An undercut structure on the internal perimeter of an injection molded product refers to a design in the injection mold where the product's internal perimeter has raised or recessed sections. These sections prevent the product from detaching during mold opening. Undercut structures are typically used for injection molded parts with complex structures to ensure that the product can be stably ejected after cooling and solidification, preventing deformation or damage due to uneven stress during demolding.

[0003] For plastic packaging products, and to address the complex internal ring-shaped undercut mold structure, which requires an internal slider due to the ring-shaped undercut in the middle of the product, the mold has a long processing cycle and high cost, increasing mold costs and making maintenance difficult. Utility Model Content

[0004] The purpose of this invention is to provide a simplified mold structure suitable for undercutting the inner perimeter of injection molded products, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a simplified mold structure suitable for undercutting the inner perimeter of injection molded products, comprising a plastic part structure and a connecting block, wherein the connecting block is vertically connected to the bottom center of the plastic part structure, and a sleeve component is provided at the bottom of the connecting block, and a spring ejector pin is vertically installed at the lower end of the sleeve component; the connecting block comprises an upper body, a lower body, and an undercut groove, wherein the lower body is connected to the bottom of the upper body, and an undercut groove is provided on the surface of the upper body near the vertical central axis of the plastic part structure.

[0006] Furthermore, the plastic part structure includes a plastic part body, a connecting post, and an inverted structure. The connecting post is vertically connected to the bottom center of the plastic part body, and the inverted structure is connected to the bottom of the connecting post.

[0007] Furthermore, the inverted structure adopts a ring structure as a whole, and the inverted structure, the plastic body, and the connecting pile are integrated into a single injection-molded structure.

[0008] Furthermore, the upper body and the lower body are integrally structured, and the upper body and the lower body as a whole adopt a quarter-inverted cone prism structure.

[0009] Furthermore, the undercut groove is vertically opened on the upper side of the upper body, and the inner surface structure of the undercut groove fits the lower body and the side surface of the undercut groove. The connecting blocks are arranged in a ring array structure with the sleeve component as the center and are distributed in four groups. The bottom of the connecting block is connected to the top of the slingshot pin.

[0010] Furthermore, the sleeve component includes a sleeve body, an annular seat, an upper cavity, a lower cavity, and a limiting component. The bottom end of the sleeve body is provided with an annular seat, and the upper end of the sleeve body is provided with an upper cavity. The lower end of the sleeve body is provided with a lower cavity, and the inner wall surface of the upper cavity is provided with a limiting component.

[0011] Furthermore, the sleeve body and the ring seat are integrally formed, and the upper cavity and the lower cavity are interconnected in the vertical direction.

[0012] Furthermore, the inner wall surface structure of the upper cavity matches the outer wall surface structure of the four sets of connecting blocks, and the surface structure of the limiting member matches the side structure of the connection between the four sets of connecting blocks. The slingshot pin penetrates vertically through the middle of the lower cavity.

[0013] This utility model provides a simplified mold structure suitable for undercutting the internal perimeter of injection molded products, which has the following beneficial effects:

[0014] 1. This utility model, by setting four sets of connecting blocks, allows the four sets of connecting blocks to be housed inside the sleeve component during the injection molding process of the plastic part. While the entire plastic part is being injected, the connecting post and undercut structure at the bottom center of the main body of the plastic part are formed within the four sets of undercut grooves, achieving a limiting and fixing function to ensure the structural stability of the plastic part during the molding process. Furthermore, the simplified structural design of the connecting blocks, sleeve component, and ejector pin reduces the space occupied inside the mold, shortens the mold processing cycle, reduces processing costs, lowers mold usage costs, and reduces mold maintenance difficulty, thus ensuring the practicality of the device structure.

[0015] 2. This utility model, by providing an upper cavity inside the sleeve body and setting a limiting component on the inner wall of the upper cavity, allows the four sets of connecting blocks to be tightly housed inside the upper end of the sleeve component during the injection molding process of the plastic part, while also ensuring sufficient structural sealing. In addition, the spring-loaded ejector pin penetrates vertically into the lower cavity, facilitating the quick ejection of the connecting blocks from inside the sleeve component. This structural design provides sufficient flexibility and good convenience between the structures, and the entire device structure has the advantages of simple and reliable structure, short processing cycle, long service life, and low cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main body of a simplified mold structure suitable for undercutting the inner perimeter of injection molded products according to the present invention.

[0017] Figure 2 This is a schematic diagram of the body disassembly structure of a simplified mold structure suitable for the internal perimeter undercut of injection molded products according to this utility model;

[0018] Figure 3 This is a three-dimensional structural diagram of a plastic part with a simplified mold structure for an internal perimeter undercut of injection molded products, according to the present invention.

[0019] Figure 4 This is a three-dimensional structural diagram of a connecting block for a simplified mold structure with an undercut around the inside of an injection molded product, according to the present invention.

[0020] Figure 5 This is a three-dimensional structural diagram of a sleeve component of a simplified mold structure suitable for undercutting the inner perimeter of injection molded products, according to the present invention.

[0021] In the diagram: 1. Plastic part structure; 101. Plastic part body; 102. Connecting post; 103. Inverted structure; 2. Connecting block; 201. Upper body; 202. Lower body; 203. Inverted groove; 3. Sleeve component; 301. Sleeve body; 302. Ring seat; 303. Upper cavity; 304. Lower cavity; 305. Limiting component; 4. Slingshot pin. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] like Figures 1 to 5As shown, a simplified mold structure suitable for undercutting the inner perimeter of injection molded products includes a plastic part structure 1 and a connecting block 2. The connecting block 2 is vertically connected to the bottom center of the plastic part structure 1, and a sleeve component 3 is provided at the bottom of the connecting block 2. A spring ejector pin 4 is vertically installed at the lower end of the sleeve component 3. The connecting block 2 includes an upper body 201, a lower body 202, and an undercut groove 203. The lower body 202 is connected to the bottom of the upper body 201, and the undercut groove 203 is opened on the surface of the upper body 201 near the vertical central axis of the plastic part structure 1. The upper body 201 and the lower body 202 are integrally formed, and the upper body 201 and the lower body 202 are made of four parts. One of the inverted conical column structures is designed with an inverted groove 203 vertically opened on the upper side of the upper body 201. The inner surface of the inverted groove 203 fits into the side surface of the lower body 202 and the inverted groove 203. The connecting block 2 is arranged in a ring array with the sleeve component 3 as the center and is distributed in four groups. The bottom of the connecting block 2 is connected to the top of the spring pin 4. When the entire plastic part structure 1 is being injected, the connecting post 102 and the inverted structure 103 in the middle of the bottom of the plastic part body 101 will be formed inside the combination of the four groups of inverted grooves 203. The structure is used to achieve the function of limiting and fixing, so as to ensure the structural stability of the plastic part structure 1 during the molding process.

[0024] like Figures 1 to 5 As shown, the plastic part structure 1 includes a plastic part body 101, a connecting post 102, and an undercut structure 103. The connecting post 102 is vertically connected to the bottom center of the plastic part body 101, and the undercut structure 103 is connected to the bottom of the connecting post 102. The undercut structure 103 adopts a ring structure as a whole, and the undercut structure 103, the plastic part body 101, and the connecting post 102 are integrally injection molded. The sleeve component 3 includes a sleeve body 301, a ring seat 302, an upper cavity 303, a lower cavity 304, and a limiting component 305. The bottom end of the sleeve body 301 is provided with a ring seat 302, and the upper end of the sleeve body 301 is provided with an upper cavity 303. The lower end of the sleeve body 301 is provided with a lower cavity 304. The inner wall surface of the upper cavity 303... A limiting component 305 is provided. The sleeve body 301 and the ring seat 302 are integrally structured. The upper cavity 303 and the lower cavity 304 are vertically interconnected. The inner wall surface structure of the upper cavity 303 matches the outer wall surface structure of the four sets of connecting blocks 2. The surface structure of the limiting component 305 matches the side structure of the connection between the four sets of connecting blocks 2. The spring pin 4 penetrates vertically through the middle of the lower cavity 304. By providing an upper cavity 303 inside the sleeve body 301 and providing a limiting component 305 on the inner wall of the upper cavity 303, the four sets of connecting blocks 2 can be tightly housed inside the upper end of the sleeve component 3 during the injection molding process of the plastic part structure 1, while ensuring sufficient structural sealing.

[0025] In summary, as Figures 1 to 5 As shown, this simplified mold structure, suitable for the internal circumferential undercut of injection molded products, is used in the following steps: First, the plastic part body 101 is injected into the mold after the mold is closed. After the upper body 201, which has a lower end body 202 and an undercut groove 203 in the middle of the bottom, is formed, the bottommost spring-loaded ejector pin 4 will be ejected vertically. Its upper end will move vertically through the lower cavity 304 inside the sleeve body 301, thereby pushing the four sets of connecting blocks 2 embedded in the upper cavity 303 vertically upward and pushing the plastic part structure 1 on top of the connecting blocks 2 upward. At this time, the connecting block 2 connected to the top of the spring-loaded ejector pin 4 will detach from the sleeve component 3 and spring open, so that the connecting post 102 and the undercut structure 103 at the bottom of the middle of the plastic part structure 1 are demolded. Then the spring-loaded ejector pin 4 will reset, thus completing one round of demolding.

[0026] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A simplified mold structure suitable for undercutting the inner perimeter of injection molded products, comprising a plastic part structure (1) and a connecting block (2), characterized in that: The bottom of the plastic part structure (1) is vertically connected to a connecting block (2), and the bottom of the connecting block (2) is provided with a sleeve component (3). The lower end of the sleeve component (3) is vertically installed with a spring pin (4). The connecting block (2) includes an upper body (201), a lower body (202) and a buckle groove (203). The bottom of the upper body (201) is connected to the lower body (202), and the upper body (201) has a buckle groove (203) on one side surface near the vertical central axis of the plastic part structure (1).

2. The simplified mold structure for undercutting the inner perimeter of injection molded products according to claim 1, characterized in that, The plastic part structure (1) includes a plastic part body (101), a connecting post (102) and an inverted structure (103). The connecting post (102) is vertically connected to the bottom middle of the plastic part body (101), and the inverted structure (103) is connected to the bottom of the connecting post (102).

3. The simplified mold structure for undercutting the inner perimeter of injection molded products according to claim 2, characterized in that, The inverted structure (103) adopts a ring structure as a whole, and the inverted structure (103), the plastic body (101), and the connecting pile (102) are integrated into an injection molded structure.

4. The simplified mold structure for undercutting the inner perimeter of injection molded products according to claim 1, characterized in that, The upper body (201) and the lower body (202) are integrated into one structure, and the upper body (201) and the lower body (202) are both designed as a quarter-inverted cone prism.

5. A simplified mold structure for undercutting the inner perimeter of injection molded products according to claim 1, characterized in that, The undercut groove (203) is vertically opened on the upper side of the upper body (201), and the inner surface structure of the undercut groove (203) fits the side surface of the lower body (202) and the undercut groove (203). The connecting block (2) is arranged in a ring array structure with the sleeve component (3) as the center and is distributed in four groups. The bottom of the connecting block (2) is connected to the top of the slingshot pin (4).

6. A simplified mold structure for undercutting the inner perimeter of injection molded products according to claim 1, characterized in that, The sleeve component (3) includes a sleeve body (301), an annular seat (302), an upper cavity (303), a lower cavity (304), and a limiting component (305). The bottom end of the sleeve body (301) is provided with an annular seat (302), and the upper end of the sleeve body (301) is provided with an upper cavity (303). The lower end of the sleeve body (301) is provided with a lower cavity (304), and the inner wall surface of the upper cavity (303) is provided with a limiting component (305).

7. A simplified mold structure for undercutting the inner perimeter of injection molded products according to claim 6, characterized in that, The sleeve body (301) and the ring seat (302) are integrally structured, and the upper cavity (303) and the lower cavity (304) are interconnected in the vertical direction.

8. A simplified mold structure for undercutting the inner perimeter of injection molded products according to claim 6, characterized in that, The inner wall surface structure of the upper cavity (303) matches the outer wall surface structure of the four sets of connecting blocks (2), and the surface structure of the limiting member (305) matches the side structure of the connection between the four sets of connecting blocks (2). The slingshot pin (4) penetrates vertically through the middle of the interior of the lower cavity (304).

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