Plastic part structure capable of preventing cracking during secondary injection molding

Abstract

The utility model relates to the technical field of injection molding parts, in particular to a plastic part structure capable of preventing cracking during secondary injection molding, which comprises a primary injection molding part and a secondary injection molding part, the primary injection molding part is provided with a plurality of terminals, and two sides of the primary injection molding part are respectively provided with a fixing groove; the secondary injection molding part is provided with a containing groove used for containing the primary injection molding part, fixing parts are arranged on the inner walls of the two sides of the containing groove respectively, and the fixing parts are arranged in the fixing grooves. The fixing part is cylindrical, and the shape of the fixing groove is matched with the shape of the fixing part. The fixing groove is formed in the primary injection molding part, so that the secondary injection molding part is provided with the fixing part inserted into the fixing groove when the secondary injection molding part is formed, the strength of the corresponding position is effectively improved through the fixing part, and the cracking phenomenon can be prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding technology field especially is a kind of plastic part structure for preventing crack when secondary injection molding. BACKGROUND

[0002] Secondary injection is a kind of commonly used injection molding process, its purpose is to let injection molding form more complex, more colorful appearance. And part of the plastic parts with terminal secondary injection, usually, after once injection molding part is fixed terminal, once injection molding part is placed into mould and secondary injection is carried out, and the fusion of the two is realized by using secondary injection part to cover part of the position of once injection molding part. But this structure, usually, it will cause the crack of the connection position (mainly both sides) of once injection molding part and secondary injection part, thereby affecting the yield and quality of product.

[0003] TECHNICAL PROBLEM

[0004] In order to solve the above technical problem, the utility model provides a kind of plastic part structure for preventing crack when secondary injection molding, can effectively prevent crack phenomenon occurs.

[0005] In order to solve the above technical problem, the utility model adopts the following technical scheme:

[0006] The utility model provides a kind of plastic part structure for preventing crack when secondary injection molding, including once injection molding part and secondary injection part, once injection molding part is equipped with multiple terminals, and the both sides of once injection molding part are provided with fixed groove respectively;Secondary injection part has the accommodation groove for accommodating once injection molding part, and the both sides inner wall of accommodation groove is provided with fixed part respectively, and fixed part is equipped in fixed groove;

[0007] The fixed part is cylindrical, and the shape of fixed groove is adapted to the shape of fixed part.

[0008] Further, the connecting portion is provided between the fixed part and the inner side wall of the accommodation groove, and the connecting groove is provided at one end of the two fixed grooves which are opposite to each other, and the connecting portion is equipped in the connecting groove.

[0009] More further, the ratio of the thickness of the connecting portion to the diameter of the fixed part is 1:2-2:3.

[0010] Further, the once injection molding part is provided with multiple first end holes side by side, the secondary injection part is provided with multiple second end holes side by side, the multiple terminals are fixedly installed one by one with the multiple first end holes, and the multiple terminals are fixedly installed one by one with the multiple second end holes.

[0011] More further, the positioning member is provided between the adjacent first end holes, and the positioning member is in T-shaped structure;The positioning groove is provided between the adjacent second end holes, and the positioning groove is in T-shaped groove, and the positioning member is equipped in the positioning groove.

[0012] Furthermore, both the first end hole and the second end hole are blind holes, and the first end hole and the second end hole are respectively located on different end faces of the primary injection molded part and the secondary injection molded part.

[0013] Furthermore, limit blocks are provided on both sides of the second end hole to prevent the terminal from dislodging from the second end hole.

[0014] The beneficial effects of this utility model are as follows: By setting a fixing groove in the primary injection molded part, the secondary injection molded part has a fixing part that can be inserted into the fixing groove when molding the secondary injection molded part. The fixing part effectively increases the strength of the corresponding position, which helps to prevent cracking. Attached Figure Description

[0015] Fig. 1 This is a schematic diagram of the present invention.

[0016] Fig. 2 This is a schematic diagram from another perspective of the present invention.

[0017] Fig. 3 This is an exploded view of the present invention.

[0018] Fig. 4 This is a schematic diagram of a one-time injection molded part according to the present invention.

[0019] Reference numerals: 1—primary injection molded part, 2—secondary injection molded part, 3—terminal, 11—fixing groove, 12—connecting groove, 13—first end hole, 14—positioning part, 20—receiving groove, 21—fixing part, 22—connecting part, 23—second end hole, 24—positioning groove, 25—limiting block, 31—abutting part. Detailed Implementation

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0021] like Figs. 1 to 4 As shown, the present invention provides a plastic part structure for preventing cracking during secondary injection molding, including a primary injection molded part 1 and a secondary injection molded part 2. The primary injection molded part 1 is equipped with multiple terminals 3, and fixing grooves 11 are respectively provided on both sides of the primary injection molded part 1. The secondary injection molded part 2 has a receiving groove 20 for accommodating the primary injection molded part 1, and fixing parts 21 are respectively provided on the inner walls of both sides of the receiving groove 20, and the fixing parts 21 are installed in the fixing groove 11.

[0022] It is verified that the strength of the container groove 20 is improved best when the fixing part 21 is cylindrical and the shape of the fixing groove 11 is adapted to the shape of the fixing part 21. In the embodiment, the terminal 3 is placed in the first mold, the first injection molding part 1 is formed by injection molding, then the first injection molding part is placed in the second mold together with the terminal 3, and the second injection molding part 2 is formed by injection molding, thereby the utility model is prepared.

[0023] The second injection molding part 2 has a large width of the container groove 20 for accommodating the first injection molding part 1, and thus the strength is small, and cracks are easily caused on both sides due to temperature change, stress change and other factors during the forming process. Therefore, the fixing groove 11 is provided when the first injection molding part 1 is formed, so that the fixing part inserted into the fixing groove 11 is formed during the second injection molding. On the one hand, the strength of both sides of the container groove 20 is improved by the fixing part, and on the other hand, the first injection molding part 1 and the second injection molding part 2 are more closely connected by the assembly and fixation of the fixing part and the fixing groove 11, so that the first injection molding part 1 and the second injection molding part 2 become an integral whole, and the strength of the second injection molding part 2 at the container groove 20 is further improved by the first injection molding part 1, so as to avoid the cracking phenomenon.

[0024] In the embodiment, the connecting part 22 is arranged between the fixing part 21 and the inner side wall of the container groove 20, and the connecting groove 12 is arranged at one end of each of the two fixing grooves 11 opposite to each other, and the connecting part 22 is arranged in the connecting groove 12.

[0025] In actual production, the ratio of the thickness of the connecting part 22 to the diameter of the fixing part 21 is 1:2-2:3. The connecting part 22 plays a role of connecting the container groove 20 and the fixing part 21, and also plays a role of behavior effect. By using the above structure, it can be effectively ensured that the second injection molding part 2 does not move relatively between the first injection molding part 1 when the second injection molding part 2 is formed by the second injection molding, thereby ensuring the firm connection of the two.

[0026] In the embodiment, the first injection molding part 1 is provided with a plurality of first end holes 13 arranged side by side, the second injection molding part 2 is provided with a plurality of second end holes 23 arranged side by side, a plurality of terminals 3 are fixedly installed one by one corresponding to the plurality of first end holes 13, and a plurality of terminals 3 are fixedly installed one by one corresponding to the plurality of second end holes 23. By cooperating the first end hole 13 with the second end hole 23, the second positioning of the terminal 3 is realized, and it is ensured that the terminal 3 does not deviate.

[0027] Specifically, the positioning part 14 is arranged between the adjacent first end holes 13, and the positioning part 14 is a T-shaped structure; the positioning groove 24 is arranged between the adjacent second end holes 23, and the positioning groove 24 is a T-shaped groove, and the positioning part 14 is arranged in the positioning groove 24.

[0028] By cooperation of the positioning member 14 and the positioning groove 24, the secondary injection molding part 2 can be prevented from being cracked at the positions of the first end hole 13 and the second end hole 23 of the primary injection molding part 1. Since the T-shaped structure has good limiting effect, cooperation of the fixed groove 11 and the fixed member structure can avoid cracking of the accommodating groove 20 at different positions in all directions, and further ensure the yield of the secondary injection molding part 2.

[0029] Specifically, the first end hole 13 and the second end hole 23 are blind holes, and the first end hole 13 and the second end hole 23 are arranged at different end faces of the primary injection molding part 1 and the secondary injection molding part 2, respectively. The blind hole structure is used for limiting assembly and fixing of the terminal 3, which is beneficial to avoid dislocation and loosening of the terminal 3 after multiple plugging and unplugging.

[0030] Specifically, the second end hole 23 is provided with a limiting block 25 on each side, and the limiting block 25 is used for preventing the terminal 3 from being separated from the second end hole 23. That is, the internal width of the second end hole 23 is actually greater than the width of the terminal 3, so that the terminal 3 has a certain deformation compensation in the second end hole 23. The terminal 3 has a resisting part 31 corresponding to the limiting block 25, that is, the terminal 3 is prevented from being separated from the second end hole 23 by the resisting part 31 resisting the limiting block 25 in the second end hole 23.

[0031] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application is disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical scheme of the present application, and any equivalent embodiment with equivalent changes is equivalent to the above embodiment. Any simple modification, equivalent change and modification of the above embodiment within the scope of the technical scheme of the present application are all within the scope of the technical scheme of the present application.

Claims

1. A plastic part structure for preventing cracking during secondary injection molding, comprising a primary injection molded part and a secondary injection molded part, wherein the primary injection molded part is equipped with multiple terminals, characterized in that: The two sides of the one-time injection molding part are respectively provided with fixing grooves; the secondary injection molding part has a containing groove for containing the one-time injection molding part, the two inner walls of the containing groove are respectively provided with fixing parts, and the fixing parts are arranged in the fixing grooves; The fixing part is cylindrical, and the shape of the fixing groove is adapted to the shape of the fixing part.

2. The plastic part configuration for preventing cracking during overmolding of claim 1, wherein: A connecting part is arranged between the fixing part and the inner wall of the containing groove, and the two fixing grooves are respectively provided with connecting grooves at the ends opposite to each other, and the connecting part is arranged in the connecting groove.

3. The plastic part configuration for preventing cracking during overmolding of claim 2, wherein: The ratio of the thickness of the connecting part to the diameter of the fixing part is 1:2-2:

3.

4. The plastic part configuration for preventing cracking during overmolding of claim 1, wherein: The one-time injection molding part is provided with a plurality of first end holes arranged side by side, the secondary injection molding part is provided with a plurality of second end holes arranged side by side, a plurality of terminals are fixedly installed one by one with the plurality of first end holes, and a plurality of terminals are fixedly installed one by one with the plurality of second end holes.

5. The plastic part configuration for preventing cracking during overmolding of claim 4, wherein: Positioning parts are arranged between adjacent first end holes, and the positioning parts are T-shaped structures; positioning grooves are arranged between adjacent second end holes, the positioning grooves are T-shaped grooves, and the positioning parts are arranged in the positioning grooves.

6. The plastic part configuration for preventing cracking during overmolding of claim 4, wherein: The first end hole and the second end hole are blind holes, and the first end hole and the second end hole are respectively arranged on different end faces of the one-time injection molding part and the secondary injection molding part.

7. The plastic part configuration for preventing cracking during overmolding of claim 4, wherein: The two sides of the second end hole are respectively provided with limiting blocks, and the limiting blocks are used for preventing the terminals from being separated from the second end hole.

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