A connecting pin structure of a fixed upper die based on a fiber composite

Abstract

The utility model discloses a kind of connecting pin structure based on fiber composite material fixed upper die, including pin body;Elastic clamping part, the elastic clamping part is installed in the outer periphery of pin body and can be elastically opened or gathered relative to pin body;Threaded connector, located pin body bottom end, for with embedded metal nut thread connection;Dismounting head, located pin body top end, for after upper die forming is completed, connecting pin structure is rotated from composite material product.Integral with the dismounting of embedded metal piece;Pin body and the connecting part of reed clamping groove design is inverted buckle structure, can effectively avoid reed from pin body in use process drop;Connecting pin structure dismounting is convenient, easy to operate, manufacturing cost is low, work is reliable, connecting pin structure has universal use demand in fiber composite material product forming process embedded metal nut fixed upper die.

Description

Technical Field

[0001] This utility model specifically relates to a connecting pin structure for fixing an upper mold based on fiber composite material. Background Technology

[0002] Fiber-reinforced composite materials (such as carbon fiber and glass fiber) are widely used in aerospace, new energy vehicles, high-end consumer electronics, drones, and sporting goods due to their excellent properties such as high specific strength, high specific modulus, high designability, and fatigue resistance. However, composite materials are typically layered structures composed of fibers and a resin matrix. This makes them very fragile under concentrated loads. Therefore, when other components need to be installed on such composite structures, a robust and durable threaded metal connection point capable of withstanding high concentrated loads must be provided.

[0003] To address these issues, the most common approach is to pre-embed metal nuts during the composite material molding process. This allows the load to be borne by the metal nut and effectively distributed throughout the composite structure via a large contact area, preventing stress concentration. However, for some product structures, due to molding limitations, the pre-embedded metal nuts need to be pre-fixed to the upper mold during molding. Traditionally, this is achieved using strong magnets, but the high molding temperature and pressure pose a risk of demagnetization. Utility Model Content

[0004] The purpose of this invention is to provide a connecting pin structure for fixing an upper mold based on fiber composite material, 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 connecting pin structure for fixing an upper mold based on fiber composite material, comprising: Pin body; An elastic retaining member is installed on the outer periphery of the pin body and can elastically open or close relative to the pin body. The threaded connector, located at the bottom end of the pin body, is used for threaded connection with the pre-embedded metal nut; The disassembly head, located at the top of the pin body, is used to unscrew the connecting pin structure from the composite material product after the upper mold is formed.

[0006] Preferably, there are two elastic retaining members, which are springs. The two springs are made of steel and are arranged symmetrically so that they can be elastically retained on the hole wall after being inserted into the pin hole of the upper mold.

[0007] Preferably, the outer periphery of the pin body is provided with an inverted snap-fit ​​groove, and the elastic retaining member is engaged in the inverted snap-fit ​​groove to prevent the elastic retaining member from falling off along the axial direction of the pin body.

[0008] Preferably, the disassembly head is an external hexagonal head.

[0009] Preferably, the pin body, threaded connector, and disassembly head are integrally formed.

[0010] Preferably, it also includes a lower mold, wherein the cavity of the lower mold is filled with a composite material.

[0011] Preferably, the diameter of the pin hole in the upper mold is larger than the outer diameter of the pin body.

[0012] The technical effects and advantages of this utility model are as follows: This connecting pin structure for fixing the upper mold based on fiber composite material meets the requirements for fixing the upper mold with pre-embedded nuts in fiber composite material, and is suitable for continuous operation in industrial production without interruption; an inverted slot is designed to connect with the spring; a threaded connector is designed at the bottom of the pin body for connecting and fixing with the pre-embedded metal nut; an external hexagonal disassembly head is designed at the top of the pin body to facilitate the overall disassembly from the pre-embedded metal part after the composite material has been cured and molded; the slot at the connection part between the pin body and the spring is designed as an inverted structure, which can effectively prevent the spring from falling off the pin body during use; the connecting pin structure is easy to assemble and disassemble, simple to operate, low in manufacturing cost, and reliable in operation. The connecting pin structure has a common application requirement in fixing the upper mold with pre-embedded metal nuts in the molding process of fiber composite material products. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the inner pin hole of the upper mold of this utility model; Figure 3 This is a schematic diagram of the structure of the threaded connector of this utility model; Figure 4 This is a front view of the main body of the pin of this utility model; Figure 5 This is a schematic diagram of the structure of the pin body of this utility model inserted into the pin hole; Figure 6 This is a schematic diagram of the structure of the embedded metal nut of this utility model; Figure 7 This is a schematic diagram of the structure of the composite material of this utility model; Figure 8 This is a schematic diagram of the structure of the pre-embedded metal nut of this utility model located in the composite material.

[0014] In the diagram: 1. Pin body; 2. Spring; 3. Threaded connector; 4. Embedded metal nut; 5. Disassembly head; 6. Upper mold; 7. Inverted slot; 8. Lower mold; 9. Composite material. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, it includes: a pin body 1; an elastic retaining member, which is installed on the outer periphery of the pin body 1 and can elastically open or close relative to the pin body 1; a threaded connector 3, located at the bottom end of the pin body 1, for threaded connection with the pre-embedded metal nut 4; and a disassembly head 5, located at the top end of the pin body 1, for unscrewing the connecting pin structure from the composite material 9 product after the upper mold is formed, with the inverted slot 7 forming a connection with the spring 2; the bottom end of the pin body 1 is designed with a threaded connector 3 for connection and fixation with the pre-embedded metal nut 4; the top of the pin body 1 is designed with an external hexagonal disassembly head 5, which facilitates the overall disassembly of the composite material 9 from the pre-embedded metal part after the composite material 9 has been cured and formed; the slot at the connection part between the pin body 1 and the spring 2 is designed with an inverted structure, which can effectively prevent the spring 2 from falling off the pin body 1 during use; the connecting pin structure is easy to assemble and disassemble, simple to operate, low in manufacturing cost, and reliable in operation.

[0017] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 Figure 7 ,and Figure 8 As shown, two elastic retaining elements are provided, and the elastic retaining elements are spring plates 2. The two spring plates 2 are made of steel and are symmetrically arranged so as to elastically retain them on the hole wall after being inserted into the pin hole of the upper mold 6, preventing the connecting pin structure from falling off. The spring plates 2 are made of spring steel. The bolt connector and the pre-embedded metal nut 4 are tightly connected by threads. The outer periphery of the pin body 1 is provided with an inverted groove 7. The elastic retaining element is engaged in the inverted groove 7 to prevent the elastic retaining element from falling off along the axial direction of the pin body 1, which can effectively prevent the spring plate 2 from falling off the pin body 1 during use. The disassembly head 5 is an external hexagonal head, which facilitates the disassembly of the connecting mechanism and the pre-embedded metal parts after the composite material 9 has been cured. The pin body 1, the threaded connector 3 and the disassembly head 5 are integrally formed structures, and the whole is made of 45# stainless steel. It also includes a lower mold 8. The composite material 9 is placed in the cavity of the lower mold 8. The upper mold 6, together with the connecting pin structure and the connecting pre-embedded metal nut 4, forms the composite material 9 in the lower mold 8. The diameter of the pin hole in the upper mold 6 is larger than the outer diameter of the pin body 1.

[0018] In use, the bolt connector and the pre-embedded metal nut 4 are first tightly connected by threads. The two spring plates 2 are then inserted into the pin holes of the upper mold 6 to fix the pin body 1. The composite material 9 is then placed into the cavity of the lower mold 8. The upper mold 6, along with the connecting pin structure and the connecting pre-embedded metal nut 4, closes downward to form the composite material 9. After forming, the connecting pin structure and the fiber composite material 9 can be simultaneously demolded from the upper mold 6 due to the threaded connection between the bolt connector and the pre-embedded metal nut 4 on the pin. The connecting pin structure is then separated from the fiber composite material 9 through the external hexagonal disassembly head 5, completing the product forming.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model.

Claims

1. A connecting pin structure for fixing an upper mold based on fiber composite material, characterized in that, include: Pin body (1); An elastic retaining member is installed on the outer periphery of the pin body (1) and can elastically open or close relative to the pin body (1); The threaded connector (3) is located at the bottom of the pin body (1) and is used to connect with the pre-embedded metal nut (4) by thread. The disassembly head (5), located at the top of the pin body (1), is used to unscrew the connecting pin structure from the composite material (9) product after the upper mold is formed.

2. The connecting pin structure for fixing the upper mold based on fiber composite material according to claim 1, characterized in that: The elastic retaining element is provided as two, and the elastic retaining element is a spring (2). The two springs (2) are made of steel and are arranged symmetrically so as to be elastically retained on the hole wall after being inserted into the pin hole of the upper mold (6).

3. The connecting pin structure for fixing the upper mold based on fiber composite material according to claim 1, characterized in that: The outer periphery of the pin body (1) is provided with an inverted groove (7), and the elastic retainer is engaged in the inverted groove (7) to prevent the elastic retainer from falling off along the axial direction of the pin body (1).

4. The connecting pin structure for fixing the upper mold based on fiber composite material according to claim 1, characterized in that: The disassembly head (5) is an external hexagonal head.

5. The connecting pin structure for fixing the upper mold based on fiber composite material according to claim 1, characterized in that: The pin body (1), threaded connector (3) and disassembly head (5) are integrally formed.

6. The connecting pin structure for fixing the upper mold based on fiber composite material according to claim 1, characterized in that: It also includes a lower mold (8), the cavity of which is filled with a composite material (9).

7. The connecting pin structure for fixing the upper mold based on fiber composite material according to claim 2, characterized in that: The diameter of the pin hole in the upper mold (6) is larger than the outer diameter of the pin body (1).

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