Nut positioning pin and injection molding device

Abstract

The embodiment of the utility model provides a nut positioning pin and an injection molding device. Wherein the nut positioning pin comprises a base part, a positioning part, an exit blocking part and a leading-in part which are connected in sequence; the side face, facing the leading-in part, of the base part is a resisting face, a nut positioning area is formed between the resisting face and the positioning part, the retreating blocking part is located on the side, facing the leading-in part, of the nut positioning area, and the outer contour size of the side, facing the leading-in part, of the retreating blocking part is larger than the outer contour size of the side, facing the leading-in part, of the retreating blocking part. And the size of the outer contour is larger than that of one side deviating from the leading-in part.

Description

Technical Field

[0001] This application relates to the field of injection molding technology, and in particular to a nut positioning pin and an injection molding device. Background Technology

[0002] For some plastic workpieces, threaded holes for bolt connection are typically formed in the workpiece by embedding nuts. For such workpieces, during injection molding, the nut is first placed into the mold, and then molten plastic material is injected into the mold cavity. Subsequently, after the molten plastic material cools and solidifies, the nut is embedded in the molded workpiece.

[0003] In related technologies, the mold is equipped with a nut positioning pin, and the end of the nut positioning pin is provided with an elastic element. The nut supply device places the nut at the end of the nut positioning pin, and the elastic element provides a retaining force to prevent the nut from separating from the nut positioning pin due to forces such as electrostatic attraction during the process of moving away from the nut positioning pin after the nut supply device has placed the nut on it.

[0004] Since the end of the nut positioning pin is located inside the mold, the elastic element will be subjected to high temperature during the injection molding process. This causes the elastic element to experience elastic decay due to long-term exposure to high temperature, which in turn affects its limiting effect on the nut. Utility Model Content

[0005] This application provides a nut positioning pin and an injection molding device to solve the problem of easy damage to nut positioning pins with elastic elements at the ends.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] In one aspect, embodiments of this application provide a nut positioning pin.

[0008] The nut positioning pin provided in this application embodiment is used to position a nut. The nut positioning pin includes a base, a positioning part, a withdrawal blocking part, and a guide part connected in sequence. The side of the base facing the guide part is a blocking surface. A nut positioning area is formed between the blocking surface and the positioning part. The withdrawal blocking part is located on the side of the nut positioning area facing the guide part. The outer contour dimension of the side of the withdrawal blocking part facing the guide part is greater than the outer contour dimension of the side of the withdrawal blocking part away from the guide part.

[0009] Optionally, the positioning part is connected to the nut with a clearance fit.

[0010] Optionally, the distance between the side of the positioning part away from the abutment surface and the abutment surface is a first distance, which is 0.3 to 0.4 times the length of the nut.

[0011] Optionally, the positioning part is provided with a guide part on the side facing the exit blocking part, and the outer diameter of the guide part is smaller than the outer diameter of the positioning part.

[0012] Optionally, the outer diameter of the guide portion is 0.95 to 0.995 times the outer diameter of the positioning portion.

[0013] Optionally, the distance between the side of the guide portion away from the abutment surface and the abutment surface is a second distance, which is 0.7 to 1 times the length of the nut.

[0014] Optionally, the guiding part is provided on the side of the guiding part facing the exit blocking part, and the guiding part is used to guide the nut that has passed through the inlet part to move toward the abutting surface.

[0015] Optionally, the guide portion is frustum-shaped, and the outer diameter of the side of the guide portion away from the positioning portion is smaller than the outer diameter of the side of the guide portion facing the positioning portion.

[0016] Optionally, the outer diameter of the inlet gradually decreases in the direction from the base toward the inlet; the outer diameter of the side of the inlet facing the base is 0.85 to 0.95 times the inner diameter of the nut.

[0017] Secondly, embodiments of this application provide an injection molding apparatus.

[0018] This application provides an injection molding apparatus including: a mold and any of the nut positioning pins provided in this application, wherein the nut positioning pin is inserted through the mold and the positioning part is housed within the mold cavity of the mold.

[0019] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0020] In the embodiments of this application, since the side of the positioning part away from the abutment surface is provided with a withdrawal blocking part, the blocking part can be used to stop the nut provided in the nut positioning area, so as to prevent the nut from exiting the nut positioning pin as the nut supply device moves.

[0021] Furthermore, the nut positioning pin provided in this application mainly includes a base, a positioning part, an exit blocking part, and an inlet part connected in sequence, and does not rely on deformable elements such as elastic elements to limit the nut. Therefore, there will be no problem that the limiting effect of the nut positioning pin will be affected by the elastic decay of the elastic element.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a nut positioning pin provided in an embodiment of this application;

[0025] Figure 2 for Figure 1 The cross-sectional view of the nut positioning pin shown in the figure;

[0026] Figure 3 This is a schematic diagram of a nut positioning pin and a nut provided for an embodiment of this application, showing the nut positioned opposite the inlet portion;

[0027] Figure 4 This is a schematic diagram of a nut positioning pin and a nut provided for an embodiment of this application, showing the nut located in the nut positioning area;

[0028] Figure 5 This is a schematic diagram of a nut positioning pin and a nut provided for an embodiment of this application, showing the nut located on the side of the exit blocking part facing the positioning part;

[0029] Figure 6 This is a schematic diagram of a mold, a nut positioning pin, and a nut provided for an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Injection molding equipment;

[0032] 100-Nut positioning pin;

[0033] 110-base;

[0034] 111-Resistant surface;

[0035] 120 - Positioning section;

[0036] 130 - Blocking section;

[0037] 140 - Introducing section;

[0038] 150 - Nut positioning area;

[0039] 160-Guiding section;

[0040] 170 - Guiding section;

[0041] 200-nut;

[0042] 300-Mold;

[0043] 310-First ontology;

[0044] 320 - Second Body. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] Furthermore, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application specification may have been selected by the applicant at his or her own discretion, and their detailed meanings are explained in the relevant sections of this description.

[0048] Furthermore, this application is required to be understood not only through the actual terms used, but also through the meaning implied by each term.

[0049] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0050] This application provides a nut positioning pin for positioning a nut. (See reference...) Figures 1 to 5 The nut positioning pin 100 provided in this application embodiment includes a base 110, a positioning part 120, an exit blocking part 130 and an inlet part 140 connected in sequence.

[0051] It should be noted that the sequential connection of the base 110, positioning part 120, exit blocking part 130, and inlet part 140 is not intended to limit the connection, but rather to allow for direct sequential connection of these components. For example, a transition structure may be provided between the positioning part 120 and the exit blocking part 130, allowing the positioning part 120 to be indirectly connected to the blocking part 130 via the transition structure. Alternatively, a transition structure may not be provided between the positioning part 120 and the exit blocking part 130, allowing for direct connection between the two components.

[0052] Therefore, in the embodiments of this application, the sequential connection of the base 110, positioning part 120, exit blocking part 130, and introduction part 140 can be understood as the base 110, positioning part 120, exit blocking part 130, and introduction part 140 being arranged and connected in sequence. For example, the base 110, positioning part 120, exit blocking part 130, and introduction part 140 are arranged and connected in sequence from left to right.

[0053] Furthermore, in the embodiments of this application, the side of the base 110 facing the guide portion 140 is a stop surface 111. A nut positioning area 150 is formed between the stop surface 111 and the positioning portion 120. Exemplarily, the nut 200, which passes through the nut positioning pin 100, can abut against the stop surface 111 and is sleeved outside the positioning portion 120, thereby positioning and engaging with the positioning portion 120 so that the nut 200 is positioned in the nut positioning area 150.

[0054] Furthermore, the exit blocking part 130 is located on the side of the nut positioning area 150 facing the inlet part 140. The outer contour dimension of the exit blocking part 130 on the side facing the inlet part 140 is larger than the outer contour dimension of the exit blocking part 130 on the side away from the inlet part 140.

[0055] by Figure 2 Taking the shown orientation as an example, the right side of the exit blocking part 130 faces the inlet part 140, and the left side of the exit blocking part 130 faces away from the inlet part 140; the outer contour dimension of the right side of the exit blocking part 130 is larger than the outer contour dimension of the left side of the exit blocking part 130. Therefore, combined with... Figures 3 to 5 After the nut supply device (not shown) places the nut 200 in the nut positioning area 150 of the nut positioning pin 100, as the nut supply device moves away from the nut positioning pin 100, even if the nut 200 moves to the right relative to the nut positioning pin 100 under the action of electrostatic adsorption force, the nut 200 is supported on the upper surface of the nut positioning pin 100 under the action of gravity. Therefore, when the nut 200 moves to the position where the blocking part 130 contacts the blocking part 130, the nut 200 will "collide" with the blocking part 130, and thus the nut 200 will be blocked to the left of the blocking part 130.

[0056] Combination Figure 6 During the mold closing process, as the second body 320 of the mold 300 moves to the left and closes with the first body 310, the second body 320 pushes the nut 200 to move to the left. This allows the nut 200 to move to the nut positioning area 150. This prevents the nut 200 from exiting the nut positioning pin 100 after being placed in position, as the nut supply device moves.

[0057] In this way, in the embodiments of this application, since the positioning part 120 is provided with an exit blocking part 130 on the side opposite to the abutment surface 111, the blocking part 130 can be used to stop the nut 200 provided in the nut positioning area 150, so as to prevent the nut 200 from exiting the nut positioning pin 100 as the nut supply device moves.

[0058] Furthermore, the nut positioning pin 100 provided in this application embodiment mainly includes a base 110, a positioning part 120, an exit blocking part 130, and an inlet part 140 connected in sequence, and does not rely on deformable elements such as elastic elements to limit the nut 200. Therefore, there will be no problem that the limiting effect of the nut positioning pin will be affected by the elastic decay of the elastic element.

[0059] In some embodiments, the positioning part 120 and the nut 200 are connected with a clearance fit. It is understood that a clearance fit refers to a fit with a clearance. Specifically, a clearance fit means that the tolerance zone of the hole is above the tolerance zone of the shaft, that is, the actual size of the hole is always greater than or equal to the actual size of the shaft. In other words, in the embodiments of this application, the lower limit of the inner diameter of the nut 200 is greater than or equal to the outer diameter of the positioning part 120.

[0060] In this way, the smoothness of the nut 200 being inserted into the positioning part 120 can be improved by the clearance fit between the positioning part 120 and the nut 200; and it can also prevent the positioning part 120 from being too large and being inserted and pulled relative to the nut 200 for a long time, which would cause serious wear, thereby improving the service life of the nut positioning pin 100.

[0061] For example, the outer diameter of the positioning part 120 is equal to 0.995 to 0.96 times the lower limit of the inner diameter of the nut 200. Taking the basic size of the inner diameter of the nut 200 as 1.2 mm, with upper and lower limits of +0.05 mm and -0.05 mm respectively, the lower limit of the inner diameter of the nut 200 is 1.15 mm. For example, the outer diameter of the positioning part 120 can be 0.01 to 0.03 mm smaller than the lower limit of the inner diameter of the nut 200. For example, the basic size of the outer diameter of the positioning part 120 is specifically 1.12 mm.

[0062] refer to Figure 2In some embodiments, the distance between the side of the positioning part 120 away from the abutment surface 111 and the abutment surface 111 is a first distance L1, which is 0.3 to 0.4 times the length of the nut 200.

[0063] In this way, by appropriately reducing the length of the positioning part 120, the length of the part of the nut positioning pin 100 that needs to be positioned and engaged with the nut 200 can be reduced, thereby improving the smoothness of the insertion of the nut 200 into the positioning part 120.

[0064] Taking the basic dimension of nut 200 as 3.0 mm, with upper and lower limits of +0.05 mm and -0.05 mm respectively, the first distance L1 can be 0.32 times the length of nut 200. That is, the first distance L1 can be 0.96 mm.

[0065] refer to Figures 1 to 4 In some embodiments, a guide portion 160 is provided on the side of the positioning portion 120 facing the exit blocking portion 130. The outer diameter of the guide portion 160 is smaller than the outer diameter of the positioning portion 120. In this way, by providing the guide portion 160 on the side of the positioning portion 120 facing the exit blocking portion 130, the nut 200 located in the nut positioning area 150 can be prevented from wobbling relative to the nut positioning pin 100.

[0066] In some embodiments, the outer diameter of the guide portion 160 is 0.95 to 0.995 times the outer diameter of the positioning portion 120. Taking the basic inner diameter of the nut 200 as 1.2 mm, with upper and lower limits of +0.05 mm and -0.05 mm respectively, the basic outer diameter of the positioning portion 120 is 1.12 mm, and the basic outer diameter of the guide portion 160 is 1.10 mm.

[0067] refer to Figure 2 In some embodiments, the distance between the side of the guide portion 160 away from the abutment surface 111 and the abutment surface 111 is a second distance L2, which is 0.7 to 1 times the length of the nut 200.

[0068] Taking the basic length of nut 200 as 3.0 mm, with upper and lower limits of +0.05 mm and -0.05 mm respectively, the second distance L2 can be 0.73 times the length of nut 200. That is, the second distance L2 can be 2.19 mm. When the first distance L1 is 0.96 mm, the length of guide part 160 is 1.23 mm.

[0069] refer to Figures 1 to 4In some embodiments, the guide portion 160 has a guide portion 170 on the side facing the exit blocking portion 130. The guide portion 170 is used to guide the nut 200, which passes through the inlet portion 140, to move towards the abutment surface 111. In this way, by providing the guide portion 170 on the side of the guide portion 160 facing the exit blocking portion 130, it is possible to prevent the nut 200 from getting stuck if it passes directly through the inlet portion 140 to the guide portion 160 and is misaligned.

[0070] refer to Figure 1 and Figure 2 In some embodiments, the guide portion 170 is frustum-shaped, and the outer diameter of the side of the guide portion 170 away from the positioning portion 120 is smaller than the outer diameter of the side of the guide portion 170 facing the positioning portion 120. It should be noted that a frustum is also called a truncated cone. The cross-section formed by the section passing through its central axis is an isosceles trapezoid. Thus, by making the outer diameter of the guide portion 170 on the side away from the positioning portion 120 smaller and the outer diameter on the side facing the positioning portion 120 larger, the guide nut 200 can be guided through the nut positioning area 150.

[0071] For example, the guide portion 170 has an angle of 10 to 15 degrees and a length of 0.75 to 0.85 times the total length of the nut.

[0072] Taking the basic length of nut 200 as 3.0 mm, with upper and lower limits of +0.05 mm and -0.05 mm respectively, and the basic inner diameter of nut 200 as 1.2 mm, with upper and lower limits of +0.05 mm and -0.05 mm respectively, the slope of guide portion 170 is 11 degrees, and the length of guide portion 170 is 2.44 mm. The outer diameter of the side of guide portion 170 opposite to positioning portion 120 is 0.83 mm.

[0073] refer to Figures 1 to 4 In some embodiments, the outer diameter of the inlet portion 140 gradually decreases in the direction from the base 110 toward the inlet portion 140. Figure 2 Taking the orientation shown as an example, the base 110 is located to the left of the guide portion 140, that is, the base 110 faces the guide portion 140 in a left-to-right direction. Furthermore, the outer diameter of the guide portion 140 gradually decreases in a left-to-right direction. In this way, the guide portion 140 can be made to have a structure that is thinner on the right and thicker on the left, thereby facilitating the guidance of the nut 200 to pass through the nut positioning pin 100 in a right-to-left direction.

[0074] For example, the outer diameter of the side of the inlet portion 140 facing the base 110 is 0.85 to 0.95 times the inner diameter of the nut 200. Taking the basic size of the inner diameter of the nut 200 as 1.2 mm, with upper and lower limits of +0.05 mm and -0.05 mm respectively, the outer diameter of the side of the inlet portion 140 facing the base 110 is 1.05 mm.

[0075] For example, the inlet portion 140 may be a semi-ellipsoidal structure. The length of the inlet portion 140 is 1 to 1.5 times the outer diameter of the side of the inlet portion 140 facing the base 110. For example, the outer diameter of the side of the inlet portion 140 facing the base 110 is 1.05 mm, and the length of the inlet portion 140 is 1.20 mm.

[0076] In some embodiments, the base 110, positioning part 120, guiding part 160, guiding part 170, exit blocking part 130, and introduction part 140 are directly connected in sequence. Of course, in other embodiments, transition parts may also be provided between each pair of the base 110, positioning part 120, guiding part 160, guiding part 170, exit blocking part 130, and introduction part 140.

[0077] For example, the nut positioning pin 100 can be made of a metal material with high hardness. It should be noted that those skilled in the art can flexibly select appropriate materials to make the nut positioning pin 100 in combination with actual needs when implementing the solutions provided in the embodiments of this application. Therefore, the embodiments of this application do not limit the material of the nut positioning pin 100.

[0078] It should also be noted that if the solution involving the use of elastic elements to prevent the nut from retracting, as described in related technologies, is adopted, when the inner diameter of the nut is small, the size of the part of the nut locating pin used to pass through the nut will also be small, resulting in a small elastic element and an even smaller cross-sectional dimension of the elastic arm. Thus, with such a small cross-sectional dimension of the elastic arm, the lifespan of the elastic element will inevitably be difficult to guarantee. Furthermore, due to the small size of the part of the nut locating pin used to pass through the nut, it will be difficult to install and fix the elastic element to this part of the nut locating pin.

[0079] The nut positioning pin 100 provided in this application mainly includes a base 110, a positioning part 120, a retraction blocking part 130, and an inlet part 140 connected in sequence, without relying on deformable elements such as elastic elements to limit the nut 200. Therefore, it avoids the problems existing in related technologies. Thus, the nut positioning pin 100 provided in this application has significant advantages over related technologies that use elastic elements to prevent the nut from retracting, especially for applications requiring the limiting of small-sized nuts (e.g., nuts with an inner diameter of less than 5 mm).

[0080] This application provides an injection molding apparatus. (See reference...) Figure 6 The injection molding apparatus 1 includes a mold 300 and any of the nut positioning pins 100 provided in the embodiments of this application. The nut positioning pin 100 passes through the mold 300, and the positioning part 120 is housed in the mold cavity of the mold 300.

[0081] For example, refer to Figures 1 to 6 The mold 300 includes a first body 310 and a second body 320. The first body 310 and the second body 320 are joined together to form a mold cavity. Thus, by injecting molten plastic into the mold cavity, a plastic part with a nut 200 embedded in it is formed after the plastic solidifies inside the mold cavity.

[0082] For example, the first body 310 is provided with a through hole. The base 110 of the nut positioning pin 100 passes through the through hole. Before inserting the nut 200, the second body 320 can be staggered with the first body 310 to prevent the second body 320 from blocking the path for inserting the nut 200 into the nut positioning area 150 of the nut positioning pin 100. Furthermore, after staggering the second body 320 with the first body 310, the nut 200 can be inserted into the nut positioning area 150 of the nut positioning pin 100 using a nut supply device.

[0083] In most cases, the nut 200 passes through the nut positioning area 150 of the nut positioning pin 100 and is positioned and engaged with the positioning part 120. During the withdrawal of the nut supply device, the nut 200 remains in the nut positioning area 150. In a few cases, during the withdrawal of the nut supply device, the nut 200 moves towards the withdrawal blocking part 130 along with the nut supply device. During the movement of the nut 200, the nut 200 rests on the upper surface of the nut positioning pin 100 under the action of gravity. Therefore, when the nut 200 moves to the position where it contacts the blocking part 130, the nut 200 will "bump" against the blocking part 130, thus blocking the nut 200 on the side of the blocking part 130 facing the positioning part 120.

[0084] Furthermore, during the mold closing process, when the second body 320 moves toward the direction of the first body 310, the second body 320 will push the nut 200 located on the side of the blocking part 130 facing the positioning part 120 to move toward the nut positioning area 150 until the nut 200 is positioned in the nut positioning area 150.

[0085] Furthermore, after the mold is closed, and with the nut 200 positioned in the nut positioning area 150, molten plastic can be injected into the mold cavity of the mold 300. Thus, after the plastic in the mold cavity solidifies, a plastic part with the nut 200 embedded is formed.

[0086] It should be noted that the structure and working principle of mold 300 can be found in relevant technologies, and will not be elaborated here. Furthermore, the nut supply device can be purchased directly from the corresponding equipment supplier; therefore, its structure and working principle will not be described here.

[0087] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0088] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the embodiments of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nut positioning pin for positioning a nut (200), characterized in that, The nut positioning needle comprises a base (110), a positioning portion (120), an exit blocking portion (130) and a leading-in portion (140) connected in sequence; The side of the base (110) towards the leading-in portion (140) is a blocking surface (111), a nut positioning area (150) is formed between the blocking surface (111) and the positioning portion (120), the exit blocking portion (130) is located on the side of the nut positioning area (150) towards the leading-in portion (140), and the outer contour size of the side of the exit blocking portion (130) towards the leading-in portion (140) is greater than the outer contour size of the side of the exit blocking portion (130) away from the leading-in portion (140).

2. The nut locator pin of claim 1, wherein, The positioning portion (120) is connected in clearance fit with the nut (200) passing through the outside of the positioning portion (120).

3. The nut locator pin of claim 1, wherein, The distance between the side of the positioning portion (120) away from the blocking surface (111) and the blocking surface (111) is a first distance, and the first distance is 0.3 to 0.4 times the length of the nut (200).

4. The nut locator pin of claim 1, wherein, The side of the positioning portion (120) towards the exit blocking portion (130) is provided with a guide portion (160), and the outer diameter of the guide portion (160) is smaller than the outer diameter of the positioning portion (120).

5. The nut locator pin of claim 4, wherein, The outer diameter of the guide portion (160) is 0.95 to 0.995 times the outer diameter of the positioning portion (120).

6. The nut locator pin of claim 4, wherein, The distance between the side of the guide portion (160) away from the blocking surface (111) and the blocking surface (111) is a second distance, and the second distance is 0.7 to 1 times the length of the nut (200).

7. The nut locator pin of claim 4, wherein, The side of the guide portion (160) towards the exit blocking portion (130) is provided with a guide portion (170), and the guide portion (170) is used for guiding the nut (200) passing through the leading-in portion (140) to move towards the blocking surface (111).

8. The nut locator pin of claim 7, wherein, The guide portion (170) is a circular truncated cone, and the outer diameter of the side of the guide portion (170) away from the positioning portion (120) is smaller than the outer diameter of the side of the guide portion (170) towards the positioning portion (120).

9. The nut locator pin of claim 1, wherein, In the direction from the base (110) towards the leading-in portion (140), the outer diameter of the leading-in portion (140) gradually decreases; and the outer diameter of the side of the leading-in portion (140) towards the base (110) is 0.85 to 0.95 times the inner diameter of the nut (200).

10. An injection molding apparatus characterized by comprising: It comprises: A mold (300) and the nut positioning needle according to any one of claims 1 to 9, the nut positioning needle is arranged in the mold (300), and the positioning portion (120) is arranged in the mold cavity of the mold (300).

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