In-mold injection molding nut anti-falling needle and injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to an in-mold injection molding nut anti-falling needle and an injection mold. The anti-falling needle for the in-mold injection molding nut comprises a needle body, a needle sleeve and a steel ball, an elastic seam and a concave part are arranged at the top of the needle body; the needle body is sleeved with the needle sleeve; the steel ball is arranged in the concave part and protrudes out of the steel ball hole of the needle sleeve; the nut sleeves the top of the needle sleeve, and the inner wall of the nut extrudes the steel ball. The elastic seam is extruded and deformed to provide elastic force for the steel ball, so that the steel ball protrudes out of the steel ball hole of the needle sleeve. When the nut is sleeved on the top of the needle sleeve, the inner wall of the nut extrudes the steel ball, and the steel ball firmly positions the nut. The steel balls are good in abrasion resistance, and the service life of the anti-disengaging needle of the in-mold injection molding nut is prolonged. The anti-falling needle for the in-mold injection molding nut is simple in structure, the steel ball is placed in the concave part during assembly, then the needle body is sleeved with the needle sleeve, and then the steel ball is aligned with the steel ball hole, so that the anti-falling needle is simpler and more convenient to assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an anti-dropping needle for an in-mold injection-molded nut and an injection mold. Background Art

[0002] Most plastic products are made by injection molding. In order to facilitate installation, nuts are usually embedded in the injection molded parts. In order to smoothly and accurately inject the nut on the product, the nut is usually placed on the pin first, and then the injection molding is performed. In order to prevent the nut from falling off during injection molding, some anti-nut falling devices on the market use springs to press on the inner wall of the nut to prevent the nut from falling off. This design has the following problems: 1. The spring is usually thin, and when used for a long time, the raised part of the spring will wear faster, affecting the service life. 2. The spring needs to be assembled in a preset slot, which is difficult to assemble.

[0003] For example, Chinese patent application number: CN202223300707.3 discloses an anti-drop structure for embedded nuts used in injection molds. The spring piece presses against the inner side of the copper nut to position the nut and prevent the nut from loosening. However, the raised part of the spring piece will wear out quickly, affecting the service life; and the spring piece is difficult to assemble.

[0004] Another example is the Chinese patent application number: CN202321699073.5, a copper nut anti-dropping device in insert injection molding. Among them, a groove for accommodating an I-shaped spring is opened inside the mold insert pin, and one side of the I-shaped spring fits against the inner wall of the copper nut body. There is also the problem that the raised part of the shrapnel will wear faster, affecting the service life; and the shrapnel is difficult to assemble. Utility Model Content

[0005] In view of this, the utility model aims at the deficiencies of the prior art, and its main purpose is to provide an in-mold injection-molded nut anti-dropping pin, which not only has a simple structure and is easy to assemble, but also has a longer service life, thereby overcoming the shortcomings of the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The present application provides an in-mold injection-molded nut anti-dropping needle, comprising a needle body, a needle sleeve, and a steel ball; the top of the needle body is provided with an elastic seam and a recessed portion; the needle sleeve is sleeved on the needle body; the steel ball is arranged in the recessed portion, and the steel ball protrudes in the steel ball hole of the needle sleeve; the nut is sleeved on the top of the needle sleeve, and the inner wall of the nut squeezes the steel ball.

[0008] Preferably, the recessed portion is one of a step, a square groove, and an arc-shaped groove.

[0009] Preferably, the elastic seam vertically penetrates the top of the needle body.

[0010] Preferably, the elastic seam is a straight seam or a cross seam.

[0011] Preferably, a first hole is vertically arranged on the top of the needle body, and the first hole partially overlaps with the elastic seam.

[0012] Preferably, the top of the needle sleeve has an arc-shaped guide surface, and the nut can be sleeved on the needle sleeve along the guide surface.

[0013] Preferably, an enlarged limiting portion is provided at the bottom of the needle body, and the needle sleeve is stopped by the limiting portion.

[0014] Preferably, the outer wall of the needle body is provided with a first thread, and the inner wall of the needle sleeve is provided with a second thread; the first thread and the second thread are screwed together.

[0015] Preferably, the width of the elastic seam is between 0.3-0.5 mm.

[0016] The present application provides an injection mold, including an in-mold injection-molded nut anti-dropping pin, wherein the upper mold and the lower mold can be closed together, and the in-mold injection-molded nut anti-dropping pin is arranged in the lower mold and can pass through the cavity of the lower mold.

[0017] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that an elastic seam and a recessed portion are provided on the top of the needle body, and the needle sleeve is provided on the needle body; the steel ball is provided in the recessed portion, and the steel ball protrudes in the steel ball hole of the needle sleeve. The elastic seam is squeezed and deformed to provide elastic force to the steel ball, so that the steel ball protrudes in the steel ball hole of the needle sleeve. When the nut is sleeved on the top of the needle sleeve, the inner wall of the nut squeezes the steel ball, and the steel ball fixes the nut. The steel ball has good wear resistance, which is beneficial to improving the service life of the in-mold injection molded nut anti-dropping needle.

[0018] The in-mold injection-molded nut anti-dropping needle has a simple structure. During assembly, a steel ball is placed in the recessed portion, and then the needle sleeve is sleeved on the needle body, and then the steel ball is aligned with the steel ball hole, so that assembly is simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0020] Figure 2 It is an exploded schematic diagram of an embodiment of the utility model.

[0021] Figure 3 It is a top view schematic diagram of an embodiment of the utility model.

[0022] Figure 4 It is a cross-sectional schematic diagram of an embodiment of the utility model.

[0023] Figure 5 It is a cross-sectional schematic diagram of the use state of the embodiment of the utility model.

[0024] Description of the accompanying drawings:

[0025] 10. needle body; 11. elastic seam; 12. first part; 13. second part; 14. recessed part; 15. limiting part; 16. first hole; 20. needle sleeve; 21. steel ball; 22. steel ball hole; 23. nut; 24. guide surface. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0027] Please refer to Figures 1 to 5 As shown, it shows the specific structure of the preferred embodiment of the utility model, which is an in-mold injection-molded nut anti-dropping pin.

[0028] The elastic seam 11 is deformed to generate elastic force, so that the steel ball 21 protrudes in the steel ball hole 22. When the nut 23 is sleeved on the needle sleeve 20, the inner wall of the nut squeezes the steel ball 21 to fix the nut 23, making the overall structure simpler, the service life longer, and the assembly more convenient.

[0029] The present application provides an in-mold injection nut anti-drop needle, comprising a needle body 10, a needle sleeve 20, and a steel ball 21; the top of the needle body 10 is provided with an elastic seam 11 and a recessed portion 14; the needle sleeve 20 is sleeved on the needle body 10; the steel ball 21 is provided in the recessed portion 14, and the steel ball 21 protrudes in the steel ball hole 22 of the needle sleeve 20; the nut 23 is sleeved on the top of the needle sleeve 20, and the inner wall of the nut 23 squeezes the steel ball 21. The needle body 10, the needle sleeve 20, and the steel ball 21 are preferably made of stainless steel, which has good wear resistance. The needle body 10 is preferably elastic stainless steel. An elastic seam 11 with a width between 0.3-0.5 mm is cut at the top of the needle body 10, and elastic force is provided to the steel ball 21 through the deformation of the elastic seam 11. During assembly, the steel ball 21 is first placed in the recessed portion 14; then the needle sleeve 20 is sleeved on the needle body 10; then the steel ball 21 is aligned with the steel ball hole 22. Under the elastic force generated by the elastic seam 11, the steel ball 21 partially protrudes from the steel ball hole 22. Therefore, when the nut 23 is sleeved on the top of the needle sleeve 20, the inner wall of the nut 23 squeezes the steel ball 21, so that the steel ball 21 can lock the nut 23, which can effectively prevent the nut 23 from loosening during injection molding. This type of in-mold injection nut anti-dropping needle has a simple structure and is easy to assemble; the steel ball 21 is wear-resistant and has a longer service life.

[0030] Preferably, the recessed portion 14 is one of a step, a square groove, and an arc groove. The recessed portion 14 in this embodiment is a step, which is the simplest structure, and only requires cutting a step at the top of the needle body 10, which is faster to process.

[0031] Preferably, the elastic seam 11 vertically penetrates the top of the needle body 10. The elastic seam 11 is a straight seam or a cross seam. The number and shape of the elastic seams 11 can be set as needed. The elastic seam 11 in this embodiment is a vertical straight seam, that is, the elastic seam 11 divides the top of the needle body 10 into a first part 12 and a second part 13. Among them, the first part 12 is provided with the recessed part 14, and the second part 13 is not provided with the recessed part 14. Of course, the top of the needle body 10 can also be divided into multiple parts, each of which is provided with a recessed part 14.

[0032] Preferably, a first hole 16 is vertically provided at the top of the needle body 10, and the first hole 16 partially overlaps with the elastic slit 11. The first hole 16 is preferably circular or elliptical. The first hole 16 improves the structure of the top of the needle body 10, and the first hole 16 and the elastic slit 11 partially overlap. The inner side surface of the first part 12 is arc-shaped, and the first part has better elastic deformation ability, so that the steel ball 21 can obtain better elastic force. Preferably, the depth of the first hole 16 is greater than the vertical length of the recessed part 14, so that the steel ball 21 can obtain better elastic force.

[0033] Preferably, the top of the needle sleeve 20 has an arc-shaped guide surface 24, and the nut 23 can be sleeved on the needle sleeve 20 along the guide surface 24. This design is convenient for workers to easily sleeve the nut 23 on the needle sleeve 20.

[0034] Preferably, the bottom of the needle body 10 is provided with an enlarged limiting portion 15, and the needle sleeve 20 is stopped by the limiting portion 15. The limiting portion 15 is arranged on the ejector plate, and the ejector plate is arranged on the ejector plate, so that the assembly of the in-mold injection nut anti-dropping needle is very convenient.

[0035] Preferably, the outer wall of the needle body 10 is provided with a first thread, and the inner wall of the needle sleeve 20 is provided with a second thread; the first thread and the second thread are screwed together. The needle sleeve 20 and the needle body 10 are assembled together in a threaded manner, which is very convenient and efficient.

[0036] The present application provides an injection mold, including an in-mold injection-molded nut anti-dropping pin, wherein the upper mold and the lower mold can be closed together, and the in-mold injection-molded nut anti-dropping pin is arranged in the lower mold and can pass through the cavity of the lower mold.

[0037] In summary, the design focus of the utility model is that the elastic seam 11 cut at the top of the needle body 10 is squeezed and deformed to generate elastic force, so that the steel ball 21 protrudes in the steel ball hole 22. When the nut 23 is sleeved on the needle sleeve 20, the inner wall of the nut squeezes the steel ball 21, so that the nut 23 is fixed. The structure of the fixed nut 23 is simpler, the service life is longer, and the assembly is more convenient.

[0038] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An in-mold injection-molded nut anti-dropping needle, characterized in that: It comprises a needle body, a needle sleeve and a steel ball; the top of the needle body is provided with an elastic seam and a recessed portion; the needle sleeve is arranged on the needle body; the steel ball is arranged on the recessed portion and protrudes from the steel ball hole of the needle sleeve; a nut is arranged on the top of the needle sleeve, and the inner wall of the nut squeezes the steel ball.

2. The in-mold injection-molded nut anti-dropping needle according to claim 1, characterized in that: The recessed portion is one of a step, a square groove, and an arc-shaped groove.

3. The in-mold injection-molded nut anti-dropping needle according to claim 1, characterized in that: The elastic seam vertically penetrates the top of the needle body.

4. The in-mold injection-molded nut anti-dropping needle according to claim 1, characterized in that: The elastic seam is a straight seam or a cross seam.

5. The in-mold injection-molded nut anti-dropping needle according to any one of claims 1 to 4, characterized in that: A first hole is vertically arranged on the top of the needle body, and the first hole partially overlaps with the elastic seam.

6. The in-mold injection-molded nut anti-dropping needle according to claim 1, characterized in that: The top of the needle sleeve has an arc-shaped guide surface, and the nut can be sleeved on the needle sleeve along the guide surface.

7. The in-mold injection-molded nut anti-dropping needle according to claim 1, characterized in that: The bottom of the needle body is provided with an enlarged limiting portion, and the needle sleeve is stopped by the limiting portion.

8. The in-mold injection-molded nut anti-dropping needle according to claim 1 or 7, characterized in that: The outer wall of the needle body is provided with a first thread, and the inner wall of the needle sleeve is provided with a second thread; the first thread and the second thread are screwed together.

9. The in-mold injection-molded nut anti-dropping needle according to claim 1, characterized in that: The width of the elastic seam is between 0.3-0.5 mm.

10. An injection mold, characterized in that: It comprises an in-mold injection-molded nut anti-dropping needle as described in any one of claims 1 to 9, wherein the upper mold and the lower mold can be closed together, and the in-mold injection-molded nut anti-dropping needle is arranged in the lower mold and can pass through the cavity of the lower mold.

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