Plastic embedded nut structure and shell

Abstract

The utility model provides a plastic embedded nut structure and a shell, and relates to the technical field of plastic embedded nuts, the plastic embedded nut structure comprises a plastic pillar and a double-step nut, the double-step nut is provided with an outer step and an inner step, the plastic pillar comprises a bottom hole and a step hole, a transition area of the step hole and the bottom hole is provided with a chamfer part, and the chamfer part is provided with a groove. The diameter of the stepped hole is larger than that of the outer step, the diameter of the bottom hole is smaller than that of the inner step, and the sum of the lengths of the stepped hole and the chamfering part is equal to the length of the outer step. By designing the structure and the size of the plastic support column and matching with the double-step nut, the pull-out force or torsion performance of the nut can be improved, especially for the nut below M3, the problems of glue overflow and insufficient torsion can be rapidly solved, the strength of key parts of plastic parts is improved, the number of times of metal shape correction is reduced, the forming trial frequency is reduced, and the forming yield is improved; and the occurrence of post-processing procedures is reduced.

Description

Technical Field

[0001] This utility model relates to the field of plastic embedded nut technology, and in particular to the structure and shell of plastic embedded nuts. Background Technology

[0002] Plastic embedded nuts, also known as thermo-pressed nuts or thermo-melted nuts, are a very effective and quick technology for reinforcing the internal threads of plastic parts. After embedding, plastic nuts can significantly increase the tensile and torsional strength and reusability of the threads of plastic parts, and simplify the mold structure. They are widely used in the structural design of plastic products.

[0003] Currently, the design of embedded nuts and plastic support components is generally quite simple. However, due to the different coefficients of thermal expansion between metal and plastic, the thin wall thickness and low strength of the plastic support components, and the tendency for stress concentration during injection molding, the arbitrarily designed simple structures inevitably lead to various quality problems, such as insufficient pull-out force or torque of the nut, support component cracking, nut being pulled out, and excess glue on the nut's top surface. Figure 3 This application addresses common defects in the development of laptops and medical devices, such as plastic overflowing onto the surface in the left image and plastic BOSS cracking in the right image. Utility Model Content

[0004] The purpose of this utility model is to provide a plastic embedded nut structure and shell, reduce the scrap rate of metal mold accessories, reduce post-processing in plastic parts production, and improve production efficiency and product yield.

[0005] To solve the above problems, this utility model provides a plastic embedded nut structure, including a plastic support column and a double-step nut. The double-step nut is provided with an outer step and an inner step. The plastic support column includes a bottom hole and a step hole. A chamfer is provided in the transition area between the step hole and the bottom hole. The diameter of the step hole is larger than the diameter of the outer step, and the diameter of the bottom hole is smaller than the diameter of the inner step. The sum of the lengths of the step hole and the chamfer is equal to the length of the outer step.

[0006] Furthermore, the double-step nut employs stepped knurled threads.

[0007] Furthermore, large floral patterns are processed on the outer steps, while small floral patterns are processed on the inner steps.

[0008] According to one embodiment of the present invention, the length of the chamfered portion is 0.3~0.5mm.

[0009] According to one embodiment of the present invention, the plastic support column is connected to the reinforcing rib.

[0010] According to one embodiment of the present invention, the reinforcing ribs are provided in several groups, generally 3 to 6 groups, and are evenly distributed on the outer circumference of the plastic support column.

[0011] According to one embodiment of the present invention, the diameter of the outer step is greater than the diameter of the inner step.

[0012] According to one embodiment of the present invention, the diameter of the outer step is 0.1~0.15mm larger than the diameter of the inner step.

[0013] According to one embodiment of the present invention, the diameter of the stepped hole is 0.1~0.2mm larger than the diameter of the outer step.

[0014] According to one embodiment of the present invention, the diameter of the bottom hole is 0.4~0.5mm smaller than the diameter of the inner step.

[0015] A housing that can be used in products such as laptops and medical devices, wherein the housing is provided with the aforementioned plastic embedded nut structure.

[0016] The beneficial effects of this utility model are that by designing the structure and size of the plastic support column and using a double-step nut, the pull-out force or torque performance of the nut can be improved. In particular, for nuts below M3, the problems of overflow and insufficient torque can be quickly solved, and the strength of key parts of the plastic part can be increased, the number of mold corrections can be reduced, the frequency of molding trials can be reduced, the molding yield can be improved, and the occurrence of post-processing steps can be reduced. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of a plastic support structure;

[0019] Figure 2 This is a schematic diagram of a double-stepped nut.

[0020] Figure 3 This is an illustration of common inappropriate content. Detailed Implementation

[0021] The following description is only intended to disclose the present invention so that those skilled in the art can implement it. The embodiments in the following description are merely examples, and those skilled in the art will conceive of other obvious modifications. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0022] Plastic embedded nut structure, such as Figure 1 , Figure 2The system includes a plastic support column 5 and a double-step nut 8. The double-step nut 8 has stepped knurled threads and is provided with an outer step 6 and an inner step 7. The plastic support column 5 includes a bottom hole 1 and a stepped hole 3. A chamfered portion 4 is provided in the transition area between the stepped hole 3 and the bottom hole 1. The diameter of the stepped hole 3 is larger than the diameter of the outer step 6, and the diameter of the bottom hole 1 is smaller than the diameter of the inner step 7. The sum of the lengths of the stepped hole 3 and the chamfered portion 4 is equal to the length of the outer step 6. The plastic support column 5 is connected to a reinforcing rib 2. Four sets of reinforcing ribs 2 are evenly distributed on the outer circumference of the plastic support column 5.

[0023] Specifically, the diameter of the stepped hole 3 is d, and the axial length of the stepped hole 3 is f; the diameter of the bottom hole 1 is b, the diameter of the outer step 6 is D, the axial length of the outer step 6 is F, the diameter of the inner step 7 is B, and the axial length of the chamfered part 4 is 0.3~0.5mm.

[0024] The diameter D of the outer step 6 is greater than the diameter B of the inner step 7, and the difference between the two is 0.1~0.15mm.

[0025] The diameter d of the stepped hole 3 is d = D + 0.2 mm. Furthermore, it can be adjusted according to the actual product structure. For example, if the torque value is insufficient, it can be adjusted downward according to the tolerance value.

[0026] 0.3~0.5+f=F (axial length of outer step 6).

[0027] The diameter of the bottom hole 1, b = B - 0.4~0.5mm, depends on the choice of resin for the plastic part. Generally, PC+ABS resin has a stronger interlocking force, so it can be slightly smaller. The b value is enlarged accordingly. The b value is related to the torque and pull-out force, etc. The specific value can be determined by molding and verification.

[0028] A housing that can be used in products such as laptops and medical devices, wherein the housing is provided with the aforementioned plastic embedded nut structure. It should be noted that this housing is not limited to an external housing.

[0029] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. A plastic embedded nut structure, characterized in that: The device includes a plastic support column (5) and a double-step nut (8). The double-step nut (8) is provided with an outer step (6) and an inner step (7). The plastic support column (5) includes a bottom hole (1) and a step hole (3). A chamfer (4) is provided in the transition area between the step hole (3) and the bottom hole (1). The diameter of the step hole (3) is larger than the diameter of the outer step (6). The diameter of the bottom hole (1) is smaller than the diameter of the inner step (7). The sum of the lengths of the step hole (3) and the chamfer (4) is equal to the length of the outer step (6).

2. The plastic embedded nut structure according to claim 1, characterized in that: The length of the chamfered portion (4) is 0.3~0.5mm.

3. The plastic embedded nut structure according to claim 1 or 2, characterized in that: The plastic support column (5) is connected to the reinforcing rib (2).

4. The plastic embedded nut structure according to claim 3, characterized in that: Several sets of reinforcing ribs (2) are evenly distributed around the outer circumference of the plastic support column (5).

5. The plastic embedded nut structure according to claim 2, characterized in that: The diameter of the outer step (6) is greater than the diameter of the inner step (7).

6. The plastic embedded nut structure according to claim 5, characterized in that: The diameter of the outer step (6) is 0.1~0.15 mm larger than the diameter of the inner step (7).

7. The plastic embedded nut structure according to claim 6, characterized in that: The diameter of the stepped hole (3) is 0.1~0.2 mm larger than the diameter of the outer step (6).

8. The plastic embedded nut structure according to claim 7, characterized in that: The diameter of the bottom hole (1) is 0.4~0.5 mm smaller than the diameter of the inner step (7).

9. A casing, characterized in that: The outer casing is provided with the plastic embedded nut structure as described in any one of claims 1-8.

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