Ejector sleeve pin mechanism and plastic part

Abstract

The utility model discloses an ejector sleeve pin mechanism and a plastic part, and mainly relates to the technical field of stud machining. Which comprises an ejector sleeve pin and an ejector sleeve, the ejector sleeve pin comprises a head part and an end part, and is characterized in that the end part of the ejector sleeve pin is provided with a fastener which is movably inserted with the ejector sleeve pin, the fastener is fixed at the root part of a screw column based on insert molding, and the peripheral side of the fastener is provided with a convex part. The utility model has the beneficial effects that the wall thickness of the nail column can be ensured to be uniform, so that the condition that the appearance surface of a plastic part shrinks is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of screw column processing, in particular to a screw threading needle mechanism and a plastic part. Background Art

[0002] Plastic parts are widely used and widely used accessory materials, and they often need to have the structure of a screw column. Their processing mainly relies on the molding of the sleeve pin assembly, and after the mold is opened, the sleeve is used to push out the glue wrapped on the sleeve pin. Due to the characteristics of the injection molding process, the accuracy and strength of the screw column structure are directly related to its shape requirements. In some products, some taller screw columns are common. Screw columns that are too tall often have problems such as insufficient strength and difficulty in ensuring accuracy. This is mainly because taller studs inevitably require longer screw column molding cavities and very long sleeve pins. The sleeve pin is impacted by the molten resin, causing it to deflect to one side (the closer to the root, the greater the deflection). The wall thickness of the screw column on the deflected side is thinner, and it cracks after the self-tapping screw is driven in. The thicker side may cause shrinkage marks and other defects on the back appearance of the screw column root.

[0003] Currently, for this kind of relatively high screw column in the market, most of them are produced by purchasing a bevel ejector. However, in some structural designs, there is not enough space for the bevel ejector in the mold, and the screw column must be ejected straight. Especially when the screw column is higher than 40mm, the wall thickness on one side of the screw column will cause eccentricity and shrinkage of the appearance. Utility Model Content

[0004] The purpose of the utility model is to provide a screw thread mechanism and a plastic part, which can ensure that the wall thickness of the nail column is uniform, thereby reducing the shrinkage of the appearance of the plastic part.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0006] A sleeve needle mechanism includes a sleeve needle and a sleeve, the sleeve needle includes a head and an end, the end of the sleeve needle is provided with a fastener movably connected thereto, the fastener is fixed to the root of the screw column based on insert molding, and the circumferential side of the fastener is provided with a protrusion.

[0007] The end of the sleeve needle is provided with an insertion column, the maximum width of the cross section of the insertion column is smaller than the diameter of the sleeve needle, and the fastener is provided with an accommodating groove or an accommodating hole adapted to the insertion column.

[0008] The fastener is provided with a receiving hole passing through the fastener, and the shape of the plug column corresponds to the cavity of the receiving hole.

[0009] The insertion post is a cylinder coaxial with the sleeve needle. The connection between the insertion post and the sleeve needle is provided with an external chamfer structure, and the top side edge of the accommodating groove or accommodating hole is provided with an internal chamfer structure that matches the chamfer structure.

[0010] There are multiple protrusions, which are distributed in a ring array relative to the fastener.

[0011] There are four raised portions distributed in a cross shape.

[0012] When the screw column root has a boss structure, the end face of the fastener close to the sleeve needle protrudes from the plastic plate and is not higher than the boss structure, and the end face of the fastener away from the sleeve needle is immersed in the plastic plate.

[0013] The top side end surface of the fastener is coplanar with the end surface of the boss structure, and the outer edge of the protrusion is coplanar and tangent to the peripheral side of the boss structure.

[0014] Another aspect of the present invention is a plastic part, comprising a plastic plate and a screw column. The plastic part is obtained by adopting the above-mentioned sleeve needle mechanism, and the root of the screw column is provided with a fastener that is insert-molded with the plastic plate.

[0015] A boss structure is provided at the root of the screw column, the end surface of the fastener away from the plastic plate is coplanar with the end surface of the boss structure, and the outer edge of the protrusion is coplanar with the peripheral surface of the boss structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The fastener is inserted into the end of the sleeve pin before production. It is then placed in the mold and injected with molten material. During the injection and curing process, the fastener secures the end of the sleeve pin, preventing it from deflecting. This ensures a uniform wall thickness after curing, improving processing quality and product durability. After injection molding, the fastener remains in the plastic part during mold removal, minimizing surface shrinkage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a disassembled schematic diagram of the cylinder needle mechanism of the utility model.

[0019] Figure 2 It is a schematic diagram of the internal structure of the plastic part obtained by processing the present invention.

[0020] Figure 3 It is a schematic diagram of the end of the sleeve needle and the fastener of the utility model.

[0021] Figure 4 It is a schematic diagram of the internal structure of the utility model during the processing.

[0022] Figure 5 This utility model Figure 4 Magnified view of part A.

[0023] Figure 6This is an example of various fasteners when the number and shape of the protrusions are different from those in Embodiments 1 and 2.

[0024] Figure 7 This is an application diagram of Example 3 of the present utility model.

[0025] Reference numerals shown in the accompanying drawings:

[0026] 1. Sleeve; 2. Sleeve needle; 3. Fastener; 4. Raised portion; 5. Accommodating space; 6. Inner chamfer structure; 7. Insert column; 8. Outer chamfer structure; 9. Screw column; 10. Plastic plate; 11. Boss structure. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and that these equivalent forms also fall within the scope defined in this application.

[0028] A sleeve needle mechanism comprises a sleeve needle 2 and a sleeve 1. The sleeve needle 2 comprises a head and an end, and adopts the relevant structures of the sleeve needle 2 and the sleeve 1 in the prior art.

[0029] To improve the positioning of the end of the sleeve needle 2, a fastener 3 is designed to be movably inserted and positioned with the end of the sleeve needle 2. The fastener 3 is a component that remains on the plastic part after the injection molding is completed and the mold is removed. It is formed by solidifying the molten masterbatch and then embedded in the connection between the screw column 9 and the plastic plate 10, forming a part of the injection molded part.

[0030] The fastener 3 is provided with an accommodating space 5 that cooperates with the end of the sleeve needle 2. The accommodating space 5 can be an accommodating hole structure or an accommodating groove structure, which is movably connected with the end of the sleeve needle 2 along the length direction of the sleeve needle 2, thereby positioning the needle body at the end of the sleeve needle to prevent the root from swinging, so that a screw column with uniform wall thickness can be obtained after the needle is withdrawn.

[0031] The circumferential side of the fastener 3 is provided with a raised portion 4. Figure 3 and Figure 6 As shown, when there are multiple protrusions 4 and they are distributed in a ring array relative to the fastener 3, a recessed structure is formed between adjacent protrusions 4, which is used to form a bite relationship with the protrusions 4 after filling with molten masterbatch, thereby improving the fixing effect. Moreover, based on the uniform distribution of the size and position of the recesses, the solidification process of the molten material is balanced, reducing deformation during cooling and solidification.

[0032] Example 1:

[0033] A sleeve needle mechanism includes a sleeve needle 2 and a sleeve 1. The sleeve needle 2 includes a head and an end. The end of the sleeve needle 2 is provided with a fastener 3 that is movably connected with it. The center of the fastener 3 is provided with a receiving hole for passing it through. The receiving hole is as follows Figure 3 An inner chamfer structure 6 is provided on the top side edge as shown, and the end of the sleeve needle 2 is provided with a plug post 7 which is coaxial with it and has a reduced diameter. The length of the plug post 7 corresponds to the length of the accommodating hole and can be inserted into the bottom end of the accommodating hole. The diameter of the plug post 7 is consistent with the inner diameter of the accommodating hole, and an outer chamfer structure 8 is provided at the connection between the plug post 7 and the sleeve needle 2. The outer chamfer structure 8 cooperates with the inner chamfer structure 6 to facilitate the insertion of the plug post 7 into the accommodating hole while quickly positioning the insertion length.

[0034] like Figure 3 As shown, the fastener 3 is provided with raised portions 4 on its circumference. There are four raised portions 4 distributed in a cross shape, and they are firmly bonded to the plastic plate 10 after curing.

[0035] In the specific production process, the fastener 3 is installed on the sleeve pin 2 before the mold is closed. After the mold is closed, the fastener 3 is fixed in the front mold cavity of the mold to prevent the sleeve pin 2 from swinging. After the injection molding is completed, the fastener 3 remains in the plastic part after the mold is removed, thus ensuring a uniform wall thickness of the screw column and reducing the shrinkage of the plastic part's appearance.

[0036] Example 2:

[0037] A sleeve needle mechanism, based on the embodiment 1, when the root of the screw column 9 has a boss structure 11 design, such as Figure 4-5 As shown, the end faces of the boss structure 11 on the top surface of the cross-shaped fastener 3 are coplanar, and the outer edge of the raised portion 4 is coplanar and tangential to the circumference of the boss structure 11. The bottom of the fastener 3 is immersed in the plastic part, so that the fastener 3 is tightly embedded in the plastic plate 10 and firmly connected to the boss structure 11. The boss structure 11 is also used to securely fix the screw column 9, improving the support strength at the base of the screw column 9. At the same time, it can evenly distribute and reduce the material used in the boss part, reducing or avoiding the problem of cooling sink marks.

[0038] Example 3:

[0039] like Figure 7 As shown, this example is a sleeve needle mechanism, including a sleeve needle 2 and a sleeve 1 that are connected together. The sleeve needle 2 includes a head and an end. The end of the sleeve needle 2 is provided with a fastener 3 that is movably connected thereto. The center of the fastener 3 is provided with a receiving groove with a sink structure. The notch of the receiving groove is provided with an inner chamfer structure 6 to facilitate the insertion of the sleeve needle 2. The difference between the sleeve needle 2 and Example 1 is that the end of the sleeve needle 2 does not adopt a variable diameter structure. The inner diameter of the receiving groove corresponds to the diameter of the sleeve needle 2. The position and depth of the end of the sleeve needle 2 can be quickly inserted and positioned through the sink.

[0040] The fastener 3 is provided with raised portions 4 on its circumferential side, and there are three raised portions 4 that are evenly distributed.

[0041] The heights of the protrusion 4 and the fastener 3 are equal, and the top surface of the fastener 3 is coplanar with the top surface of the plastic plate 10 , and the bottom of the fastener 3 is immersed in the plastic part.

Claims

1. A sleeve needle mechanism, comprising a sleeve needle and a sleeve, wherein the sleeve needle comprises a head and an end, and is characterized in that: The end of the sleeve needle is provided with a fastener movably connected thereto. The fastener is fixed to the root of the screw column based on insert molding, and a protrusion is provided on the peripheral side of the fastener.

2. The sleeve needle mechanism according to claim 1, characterized in that: The end of the sleeve needle is provided with an insertion column, the maximum width of the cross section of the insertion column is smaller than the diameter of the sleeve needle, and the fastener is provided with an accommodating groove or an accommodating hole adapted to the insertion column.

3. The sleeve needle mechanism according to claim 2, characterized in that: The fastener is provided with a receiving hole passing through the fastener, and the shape of the plug column corresponds to the cavity of the receiving hole.

4. The sleeve needle mechanism according to claim 2, characterized in that: The insertion post is a cylinder coaxial with the sleeve needle. The connection between the insertion post and the sleeve needle is provided with an external chamfer structure, and the top side edge of the accommodating groove or accommodating hole is provided with an internal chamfer structure that matches the chamfer structure.

5. The sleeve needle mechanism according to claim 1, characterized in that: There are multiple protrusions, which are distributed in a ring array relative to the fastener.

6. The sleeve needle mechanism according to claim 1, characterized in that: There are four raised portions distributed in a cross shape.

7. The sleeve needle mechanism according to claim 1, characterized in that: When the screw column root has a boss structure, the end face of the fastener close to the sleeve needle protrudes from the plastic plate and is not higher than the boss structure, and the end face of the fastener away from the sleeve needle is immersed in the plastic plate.

8. The sleeve needle mechanism according to claim 7, characterized in that: The top side end surface of the fastener is coplanar with the end surface of the boss structure, and the outer edge of the protrusion is coplanar and tangent to the peripheral side of the boss structure.

9. A plastic part, comprising a plastic plate and a screw column, characterized in that: The plastic part is obtained by adopting a screw needle mechanism according to any one of claims 1 to 8, and the root of the screw column is provided with a fastener that is insert-molded with the plastic plate.

10. The plastic part according to claim 9, characterized in that: A boss structure is provided at the root of the screw column, the end surface of the fastener away from the plastic plate is coplanar with the end surface of the boss structure, and the outer edge of the protrusion is coplanar with the peripheral surface of the boss structure.

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