Injection molding part capable of preventing preassembled nut from falling off

Abstract

The utility model discloses a preassembled nut anti-drop injection molding part, which comprises a preassembled nut, the preassembled nut enters a hole groove with an adaptive size arranged on the injection molding part through stamping, a plurality of latches are integrally formed on the periphery of the preassembled nut, the latches are distributed at intervals along the axial direction of the preassembled nut, an annular notch is formed between every two adjacent latches, and the preassembled nut is inserted into the hole groove. The annular notch is sleeved with a plurality of annular blocking layers, and the outer diameter of the outermost blocking layer is equal to the outer diameter of the annular notch. According to the injection molding part capable of preventing the preassembled nut from falling off, the clamping teeth which are arranged at intervals are integrally formed on the periphery of the preassembled nut, the annular notches are formed among the clamping teeth, the hollow flexible wrapping sleeve is sleeved at the annular notches firstly, and then the thin elastic cushion is nested at the annular notches, so that the wrapping sleeve on the inner side can be restrained to be in a relatively regular state, and the preassembled nut can be prevented from falling off. And the annular gap is completely filled outwards and is in contact with the inner wall of the hole groove, so that the contact friction force is further increased, and the problem that the preassembled nut falls off after swinging and shaking is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding part technical field, concretely is a kind of injection molding part of preassembled nut anti-falling. BACKGROUND

[0002] The process of in-mold injection nut is to place the nut directly in the mold and then injection molding, in order to improve the connection strength with other components, usually embedded metal nut and fixed on plastic part, realize the connection with other components, the stability and fixing effect of nut are good, and the production process is simple, and has been widely applied.

[0003] The nut is generally assembled in advance in the factory by stamping / pressing, that is, it is pressed into the hole slot of the injection molding part with adaptive size. However, when it is hot, the temperature in the factory is high or in the closed high-temperature transport box during transportation, the injection molding part will expand due to heat, and the nut will fall off during vibration, resulting in defective products.

[0004] In order to solve the above problems, the present case is born. CONTENT OF THE UTILITY MODEL

[0005] (I) Technical problem solved

[0006] In view of the deficiencies of the prior art, the utility model provides an injection molding part with preassembled nut anti-falling, which solves the problems raised in the background technology.

[0007] (II) Technical scheme

[0008] In order to achieve the above purpose, the utility model is realized by the following technical scheme: an injection molding part with preassembled nut anti-falling, comprising a preassembled nut, which is punched into the hole slot with adaptive size in the injection molding part, the outer periphery of the preassembled nut is integrally formed with a clamping tooth, the clamping tooth is spaced apart along its axial direction, and a plurality of annular gaps are formed between the two adjacent clamping teeth, a plurality of annular blocking layers are sleeved at the annular gaps, and the outer diameter of the outermost blocking layer is equal to the outer diameter of the annular gap.

[0009] Preferably, the blocking layer comprises a flexible wrapping sleeve on the inside and an elastic pad nested twice on the outside.

[0010] Preferably, the wrapping sleeve is hollow inside, and filled with particles.

[0011] Preferably, the filled particles are made of a material that is less heat-stable than the injection molding part, and can be any one of polyvinyl chloride or polypropylene.

[0012] (III) Beneficial effects

[0013] After adopting the above technical solution, this utility model has the following advantages compared with the prior art: The injection molded part for preventing the pre-installed nut from falling off has multiple spaced teeth integrally formed on the outer circumference of the pre-installed nut, and an annular gap is formed between the teeth. A hollow flexible wrapping sleeve is first fitted at the annular gap, and then a thin elastic pad is nested inside. This can firstly restrain the inner wrapping sleeve to a relatively regular state, and secondly completely fill the annular gap outward and contact the inner wall of the hole groove, further increasing the contact friction to avoid the problem of the pre-installed nut falling off after swinging or shaking.

[0014] Secondly, the sleeve contains filler particles made of a material with poorer thermal stability than injection molded parts. This ensures that the volume of the filler particles expanding after heating is always greater than the expansion size of the inner wall of the slot, thereby enabling the pre-installed nut to be firmly pressed against the inner wall of the slot. Attached Figure Description

[0015] Figure 1 This is a conventional schematic diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the pre-installed nut of this utility model;

[0018] Figure 4 This is a schematic diagram of the improved pre-installed nut of this utility model.

[0019] In the diagram: 1. Injection molded part; 2. Pre-installed nut; 21. Clamping tooth; 22. Annular notch; 23. Elastic pad; 24. Wrapping sleeve; 25. Filler particles; 3. Hole and groove. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 As shown: A pre-installed nut anti-loosening injection molded part 1 has a hole groove 3 for the pre-installed nut 2 to be inserted, and the pre-installed nut 2 is punched into the hole groove 3 of the appropriate size.

[0022] like Figures 2-3 As shown, the pre-installed nut 2 has integrally formed retaining teeth 21 on its outer circumference. Multiple retaining teeth 21 are spaced apart along its axial direction. The arrangement of retaining teeth 21 allows the pre-installed nut 2 to be more tightly embedded in the groove 3, further preventing loosening. At the same time, it can prevent the pre-installed nut 2 from rotating when used. Compared with traditional hexagonal nuts, it is more conducive to the pre-installed nut 2 being fastened to the groove 3 after the injection molded part 1 expands due to heat.

[0023] Considering the irregularity of the plastic expansion, the hole 3 still has a small probability of expanding and causing the pre-installed nut 2 to fall off, so as shown in Figure 4 The annular gap 22 is formed between the two adjacent teeth 21, and a hollow flexible wrapping sleeve 24 (made of conventional materials, such as sponge, etc.) is first sleeved at the annular gap 22.

[0024] The wrapping sleeve 24 is internally provided with filling particles 25 (filling particles 25 fill the inside), and it should be noted that the filling particles 25 are made of a material that is less heat stable (i.e., greater heat deformation) than the injection molding part 1, such as polyvinyl chloride, polypropylene, etc. (automotive parts generally use materials such as "PA66+GF30", modified plastics, etc., which have relatively good heat stability). After heating, the volume of the internal filling particles 25 expands to be greater than the size of the hole 3 inner wall expansion, thereby enabling the pre-installed nut 2 to be firmly seated in the hole 3 inner wall.

[0025] Further, a thin elastic pad 23 (such as silicone material) is nested on the outer layer of the wrapping sleeve 24, which can constrain the wrapping sleeve 24 on the inside to a relatively regular state, and can completely fill the annular gap and contact the hole 3 inner wall, further increasing the contact friction to avoid the problem of the pre-installed nut 2 falling off after shaking and shaking.

[0026] The above description is based on the example, through the above description, relevant personnel can make various changes and modifications without deviating from the scope of the present invention. The scope of the new technology used in this invention is not limited to the content of the specification, and the scope of protection must be determined according to the scope of the claims.

Claims

1. A pre-installed nut-prevented injection molded part, comprising a pre-installed nut, which is punched into a groove of appropriate size opened in the injection molded part, characterized in that: The pre-installed nut has integrally formed teeth on its outer circumference, and multiple teeth are spaced apart along its axial direction. An annular notch is formed between two adjacent teeth, and multiple annular blocking layers are fitted at the annular notch. The outer diameter of the outermost blocking layer is the same as the outer diameter of the annular notch.

2. The injection molded part with pre-installed nuts to prevent detachment according to claim 1, characterized in that: The blocking layer includes an inner flexible wrapping sleeve and an outer secondary nested elastic pad.

3. The injection molded part with pre-installed nuts to prevent detachment according to claim 2, characterized in that: The wrapping sleeve is hollow inside and contains filling particles, which fill the hollow interior.

4. The injection molded part with pre-installed nut to prevent detachment according to claim 3, characterized in that: The filler particles are made of a material with poorer thermal stability than injection molded parts, and can be either polyvinyl chloride or polypropylene.

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