Structure for preventing shrinkage and position mark of screw column and sound box

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By designing the screw column structure of the beveled face and reinforcement ribs in the speaker, the shrinkage and position printing problems at the connection between the plastic parts and the studs are solved, the strength of the screw column is enhanced, the cost is increased, and the aesthetics and function of the speaker are realized. promote.

CN222363262UActive Publication Date: 2025-01-17SHENZHEN FENDA TECH CO LTD

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Patent Information

Application Number: CN202420937038.0
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-04-26
Publication Date: 2025-01-17
Estimated Expiration: 2034-04-26

AI Technical Summary

Technical Problem

In the speaker industry, the connection between plastic parts and studs is caused by thermal expansion and contraction, causing shrinkage and column printing, and thinning of studs will lead to insufficient strength, increase costs, and increase the main glue thickness of plastic parts. Interferes with internal devices.

Method used

Design a structure that prevents shrinkage and position printing of screw posts, including beveled surface, screw posts and reinforcement ribs. The glue thickness ratio at the connection between screw posts and beveled is 0.4:1. The base of screw posts is glue-extracted, and reinforcement ribs are The beveled surface connection enhances the strength of the screw post and anti-shrinkage effect.

Benefits of technology

Effectively prevent shrinkage and position printing, there is no need to thin the screw post glue thickness or increase the main glue thickness of the plastic parts, enhance the strength of the screw post, reduce costs, and maintain the beautiful appearance of the speaker.

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Abstract

The utility model discloses a structure for preventing shrinkage and position printing of a screw column and a sound box, the structure for preventing shrinkage and position printing of the screw column comprises a casing, the screw column and at least one reinforcing rib, and the casing is provided with an inclined surface part; one end of the bottom of the screw column is connected with the inclined surface part, and the other end of the bottom of the screw column and the inclined surface part are arranged at intervals; one end of the reinforcing rib is connected with the inclined surface part, the other end of the reinforcing rib is connected with the outer side wall of the screw column, and the ratio of the glue thickness of the joint of the screw column and the inclined surface part to the glue thickness of the inclined surface part is 0.4: 1. According to the utility model, the root part of the screw column is subjected to glue drawing treatment, and the ratio of the glue thickness at the joint of the screw column and the inclined surface part to the glue thickness of the inclined surface part is 0.4: 1, so that the plastic at the root part of the screw column is not concentrated any more and is fully cooled, a good effect on preventing shrinkage and position printing is achieved, the glue thickness of the screw column does not need to be thinned, and the main glue thickness of a plastic part does not need to be increased; and the reinforcing ribs not only can enhance the strength of the screw column, but also can further prevent the phenomena of shrinkage and position marks.

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Description

Technical Field

[0001] The utility model relates to the technical field of sound box structures, in particular to a structure for preventing shrinkage and position printing of screw columns and a sound box. Background Art

[0002] At present, since the plastic parts in the speaker industry need to be assembled with other devices, studs are fixed on the wall of the plastic parts. The studs are provided with threaded holes for installing screws when connecting with other devices. The studs need to withstand the greater stress generated by the screws. The studs and plastic parts are as follows: Figures 1 to 3 In the design shown, the main glue thickness D1 of the plastic part 10 is 2.13MM, and the glue thickness D2 of the stud 20 at the connection with the plastic part 10 is 2.19MM, and the ratio of the glue thickness of the two is close to 1:1.

[0003] However, when the product is injection molded, due to the principle of thermal expansion and contraction, the glue at the connection between the plastic part 10 and the stud 20 will be diverted to the stud 20, causing the product to shrink and produce stud marks. If the stud 10 is thinned, the strength of the stud 20 will be insufficient after the thread is punched, causing the stud to burst. Thickening the main glue at the connection of the plastic part 10 involves thickening the main glue of the entire plastic part 10, which greatly increases the cost and interferes with the internally installed devices. Utility Model Content

[0004] The utility model aims to provide a structure and a speaker for preventing shrinkage and position marks of screw columns, so as to solve the problem that the ratio of the main glue thickness D1 of the existing plastic part to the glue thickness D2 of the stud at the connection with the plastic part is close to 1:1. When the product is injection molded, the glue at the connection between the plastic part and the stud will be diverted to the stud, so that the product will shrink and the column position mark will occur. If the stud is thinned, it will lead to insufficient strength of the stud after the thread is punched, resulting in column explosion. Thickening the main glue thickness of the plastic part at the connection involves the need to thicken the main glue thickness of the entire plastic part, which greatly increases the cost and interferes with the technical problems of the components installed inside.

[0005] The utility model provides a structure for preventing shrinkage and marking the position of a screw column, comprising:

[0006] A casing, wherein the casing is provided with an inclined portion;

[0007] A screw column, wherein the screw column is vertically arranged, one end of the bottom of the screw column is connected to the inclined portion, and the other end is spaced apart from the inclined portion;

[0008] At least one reinforcing rib, one end of the reinforcing rib is connected to the inclined portion, and the other end is connected to the outer side wall of the screw column, and the ratio of the glue thickness at the connection between the screw column and the inclined portion to the glue thickness of the inclined portion is 0.4:1.

[0009] Furthermore, the glue thickness at the connection between the screw column and the bevel portion is 0.87±0.01 mm.

[0010] Furthermore, the glue thickness of the inclined portion is 2.15±0.01 mm.

[0011] Furthermore, the angle formed by the plane where the bottom of the screw column is located and the inclined portion is 41±1 degrees.

[0012] Furthermore, the ratio of the glue thickness of the screw column to the glue thickness of the inclined portion is 0.8:1.

[0013] Furthermore, the ratio of the inner diameter of the screw column to the outer diameter of the screw column is 0.4:1.

[0014] Furthermore, the ratio of the height of the screw column to the glue thickness of the inclined portion is 2.47:1.

[0015] Furthermore, the number of the reinforcing ribs is three, the three reinforcing ribs are arranged outside the screw column, and the minimum distance between two adjacent reinforcing ribs is 3.75±0.01mm.

[0016] Furthermore, the ratio of the glue thickness of the reinforcing rib to the glue thickness of the inclined portion is 0.35:1.

[0017] The utility model also provides a sound box, comprising the structure of anti-shrinkage and position printing of the screw column as described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The utility model has one end at the bottom of the screw column connected to the inclined portion and the other end spaced apart from the inclined portion. The root of the screw column is processed with glue removal. The ratio of the glue thickness at the connection between the screw column and the inclined portion to the glue thickness of the inclined portion is 0.4:1, so that the plastic at the root of the screw column is no longer so concentrated and is fully cooled, which has a good effect on preventing shrinkage and position marks. There is no need to thin the glue thickness of the screw column or increase the main glue thickness of the plastic part. One end of the reinforcing rib is connected to the inclined portion and the other end is connected to the outer wall of the screw column. The reinforcing rib can not only enhance the strength of the screw column, but also further prevent shrinkage and position marks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of a traditional product;

[0021] Figure 2 It is a cross-sectional view of a traditional product;

[0022] Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A;

[0023] Figure 4 A schematic diagram of the structure of the screw post anti-shrinkage and position printing structure provided in an embodiment of the utility model;

[0024] Figure 5 A cross-sectional view of the structure of the screw column anti-shrinkage and position printing provided in the embodiment of the utility model Figure 1 ;

[0025] Figure 6 for Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0026] Figure 7 A cross-sectional view of the structure of the screw column anti-shrinkage and position printing provided in the embodiment of the utility model Figure 2 ;

[0027] Figure 8 for Figure 7 A partial enlarged schematic diagram of point C in the middle.

[0028] In the figure:

[0029] 10. Plastic part; 20. Stud; 30. Casing; 31. Inclined portion; 32. Outer shell; 321. Through hole; 322. Sound outlet hole; 33. Baffle; 34. Arc portion; 40. Screw column; 41. Threaded hole; 42. Chamfer; 50. Reinforcing rib. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0031] See also Figures 4 to 8 As shown, an embodiment of the utility model discloses a structure for preventing shrinkage and imprinting of screw columns. The structure for preventing shrinkage and imprinting of screw columns includes a housing 30 and a screw column 40. The housing 30 is provided with an inclined portion 31. The screw column 40 is vertically arranged. The screw column 40 is fixed on the inclined portion 31 of the housing 30. The screw column 40 is the most common structural form in the structural design of plastic products, and is also the structure that encounters the most problems in molding.

[0032] The screw column 40 is prone to shrinkage and position marks on the surface of the plastic housing 30 during injection molding. Therefore, a commonly used method is to make a crater on the screw column 40. The crater is to extend the hole edge of the outer cylindrical surface of the screw column 40 upward. After sufficient cooling, the crater has a good effect on preventing shrinkage and position marks.

[0033] The present embodiment adopts another method to solve the shrinkage and position mark problems. The structure of the screw column to prevent shrinkage and position mark also includes at least one reinforcing rib 50. One end of the bottom of the screw column 40 is connected to the inclined portion 31, and the other end is spaced apart from the inclined portion 31. The other end of the screw column 40 and the inclined portion 31 are equivalent to a suspended setting. The root of the screw column 40 is treated with glue removal. One end of the reinforcing rib 50 is connected to the inclined portion 31, and the other end is connected to the outer wall of the screw column 40. The reinforcing rib 50 can increase the strength of the entire screw column 40. The ratio of the glue thickness D3 at the connection between the screw column 40 and the inclined portion 31 to the glue thickness D4 of the inclined portion 31 is 0.4:1, so that the plastic at the root of the screw column 40 is no longer so concentrated and is fully cooled, which has a good effect on preventing shrinkage.

[0034] It should be noted that the main reason for shrinkage is a surface defect phenomenon caused by the different thickness of the plastic glue in the mold and the asynchronous cooling of the glue. The screw column 40 is arranged on the casing 30. In order to avoid shrinkage during the injection molding process, the present embodiment adopts a ratio of the glue thickness D3 at the connection between the screw column 40 and the bevel portion 31 to the glue thickness D4 of the bevel portion 31 of 0.4:1. The contact area between the screw column 40 and the bevel portion 31 is small, which can effectively avoid excessive pulling of the glue of the bevel portion 31 during the molding process of the screw column 40, so that the thickness of the casing 30 at this position will not be too thinned, thereby preventing the casing 30 from shrinking and position printing. At the same time, the screw column 40 can also pull the glue in the reinforcing rib 50 during the molding process. The reinforcing rib 50 can not only enhance the strength of the screw column 40, but also prevent the casing 30 from shrinking and position printing. Therefore, as long as the contact area of the parts in contact with the casing 30 is controlled within a certain proportion range, the probability of shrinkage and position printing will be reduced.

[0035] In this embodiment, the glue thickness D3 at the connection between the screw column 40 and the bevel portion 31 is 0.87±0.01mm. The screw column 40 generally needs to withstand the greater stress generated by the screw. Therefore, the material thickness of the plastic housing 30 must be sufficient. Usually, the material thickness of the housing 30 is greater than or equal to 1.3mm. The glue thickness D4 of the bevel portion 31 is 2.15±0.01mm. The bevel portion 31 is a part of the structure of the housing 30. The thickness of the entire housing 30 can be 2.15±0.01mm.

[0036] In some embodiments, the angle β formed by the plane where the bottom of the screw column 40 is located and the inclined surface 31 is 41±1 degrees, so that the root of the screw column 40 can be processed by a debonding process.

[0037] The glue thickness D5 of the screw column 40 is 1.68±0.01mm, and the ratio of the glue thickness D5 of the screw column 40 to the glue thickness D4 of the inclined portion 31 is 0.8:1. The screw column 40 is penetrated by a threaded hole 41 for installing screws when connecting with other devices. The inner diameter D6 of the screw column 40 is 2.27±0.01mm, and the outer diameter D7 of the screw column 40 is 5.70±0.01mm. The ratio of the inner diameter D6 of the threaded hole 41 to the outer diameter D7 of the screw column 40 is 0.4:1, so that the screw column 40 retains sufficient thickness to avoid the screw column 40 from bursting during the installation of the screw. The device can be a PCB board, etc.

[0038] The height of the screw column 40 should be as short as possible. The height D8 of the screw column 40 is 5.30±0.01mm. The ratio of the height D8 of the screw column 40 to the glue thickness D4 of the inclined portion 31 is 2.47:1. The reinforcing rib 50 can increase the strength. The reinforcing rib 50 can be said to be an indispensable functional structure in plastic products. The reinforcing rib 50 can increase the strength and rigidity of the screw column 40 without increasing the wall thickness of the screw column 40. At the same time, the reinforcing rib 50 can also serve as an internal flow channel of the screw column 40, which helps the flow of glue during injection molding and facilitates the filling of the mold cavity.

[0039] In this embodiment, there are three reinforcing ribs 50, which are arranged outside the screw column 40, and the three reinforcing ribs 50 are arranged in parallel. The reinforcing ribs 50 on the screw column 40 can be made higher. The height difference D9 between the screw column 40 and the reinforcing ribs 50 is 0.48±0.01mm, and the reinforcing ribs 50 are 0.48mm shorter than the screw column 40. The reinforcing ribs 50 can adopt the sleeve ejection process.

[0040] In some embodiments, the bottom glue thickness D10 of the reinforcing rib 50 is 0.75±0.01mm, and the ratio of the glue thickness D10 of the reinforcing rib 50 to the glue thickness D4 of the inclined portion 31 is 0.35:1. The bottom glue thickness D10 of the reinforcing rib 50 generally should not exceed half of the glue thickness D4 of the inclined portion 31, that is, D10≤0.5xD4. Too thick reinforcing rib 50 will cause shrinkage of the appearance, water marks and other undesirable phenomena. For example, if the screw column 40 has a higher strength requirement, it is better to design more short and thin reinforcing ribs 50 than to design tall and thick reinforcing ribs 50.

[0041] The distance between two adjacent reinforcing ribs 50 is generally not less than the glue thickness D4 of the inclined portion 31. The minimum distance D11 between two adjacent reinforcing ribs 50 is 3.75±0.01 mm. The distance between the reinforcing ribs 50 should not be designed to be too small. If it is too small, thin steel will be produced on the mold. Too much thin steel will reduce the life of the mold.

[0042] A chamfer 42 is provided at the entrance of the inner diameter of the screw column 40. The size of the chamfer 42 is generally (1-1.5) x 45°, which is mainly used to reduce the initial stress when tightening the screw. The root of the screw column 40 can adopt a rounded transition to avoid stress concentration.

[0043] In this embodiment, the casing 30 includes an outer shell 32, a baffle 33, two arc-shaped portions 34 and the inclined portion 31. The outer shell 32 is provided with a through hole 321 and a sound outlet hole 322 for installing a speaker. Two side ends of the inclined portion 31 are respectively connected to the inner wall of the through hole 321 and the baffle 33, and the other two side ends of the inclined portion 31 are respectively connected to the two arc-shaped portions 34. The baffle 33, the inclined portion 31 and part of the side ends of the two arc-shaped portions 34 are all connected to the inner wall of the through hole 321 to form the casing 30. The screw column 40 is located inside the casing 30.

[0044] The utility model also discloses a sound box, comprising the structure of preventing shrinkage and position printing of screw posts as described above, and the product made after the mold is opened is very beautiful, and the appearance of the product has no shrinkage of the post position and no post position printing.

[0045] In summary, in the present invention, one end of the bottom of the screw column 40 is connected to the inclined portion 31, and the other end is spaced apart from the inclined portion 31. The root of the screw column 40 is processed by glue removal. The ratio of the glue thickness at the connection between the screw column 40 and the inclined portion 31 to the glue thickness of the inclined portion 31 is 0.4:1, so that the plastic at the root of the screw column 40 is no longer so concentrated and is fully cooled, which has a good effect on preventing shrinkage and position marks. There is no need to thin the glue thickness of the screw column 40, nor to increase the main glue thickness of the plastic part 10. One end of the reinforcing rib 50 is connected to the inclined portion 31, and the other end is connected to the outer wall of the screw column 40. The reinforcing rib 50 can not only enhance the strength of the screw column 40, but also further prevent shrinkage and position marks.

[0046] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A structure for preventing shrinkage and marking of screw posts, characterized in that: include: A casing, wherein the casing is provided with an inclined portion; A screw column, wherein the screw column is vertically arranged, one end of the bottom of the screw column is connected to the inclined portion, and the other end is spaced apart from the inclined portion; At least one reinforcing rib, one end of the reinforcing rib is connected to the inclined portion, and the other end is connected to the outer side wall of the screw column, and the ratio of the glue thickness at the connection between the screw column and the inclined portion to the glue thickness of the inclined portion is 0.4:

1.

2. The structure for preventing shrinkage and marking the screw column according to claim 1, characterized in that: The glue thickness at the connection between the screw column and the inclined portion is 0.87±0.01mm.

3. The structure for preventing shrinkage and marking the position of screw posts according to claim 1, characterized in that: The glue thickness of the inclined portion is 2.15±0.01 mm.

4. The structure for preventing shrinkage and marking the position of screw posts according to claim 1, characterized in that: The angle formed by the plane where the bottom of the screw column is located and the inclined portion is 41±1 degrees.

5. The structure for preventing shrinkage and marking the position of a screw column according to claim 1, characterized in that: The ratio of the glue thickness of the screw column to the glue thickness of the inclined portion is 0.8:

1.

6. The structure for preventing shrinkage and marking the position of a screw column according to claim 1, characterized in that: The ratio of the inner diameter of the screw column to the outer diameter of the screw column is 0.4:

1.

7. The structure for preventing shrinkage and marking the position of a screw column according to claim 1, characterized in that: The ratio of the height of the screw column to the glue thickness of the inclined portion is 2.47:

1.

8. The structure for preventing shrinkage and marking the position of a screw column according to claim 1, characterized in that: The number of the reinforcing ribs is three, and the three reinforcing ribs are arranged outside the screw column. The minimum distance between two adjacent reinforcing ribs is 3.75±0.01mm.

9. The structure for preventing shrinkage and marking the position of a screw column according to claim 1, characterized in that: The ratio of the glue thickness of the reinforcing rib to the glue thickness of the inclined portion is 0.35:

1.

10. A sound box, characterized in that: The invention comprises a structure for preventing shrinkage and printing the position of a screw column as described in any one of claims 1 to 9.