Insert pin for injection mold and injection mold

Abstract

The utility model relates to injection moulding technology field, specifically disclose a kind of insert pin and injection mould for injection mould, insert pin for injection mould includes insert pin body, one end of insert pin body is used to install in the movable mould or static mould of injection mould, the end face of the other end of insert pin body is protruding and provided with installation portion and the abutting surface of the ring of installation portion bottom outer periphery, installation portion is used to be inserted in insert, the end face of insert is abutted to abutting surface, multiple suction holes are spaced apart and are provided on the abutting surface along the circumference direction;The inside of insert pin body is equipped with main gas passage and multiple sub gas passages, the suction port of main gas passage is arranged in the side of insert pin body and is used to be connected with vacuumizing equipment;One end of sub gas passage is communicated with main gas passage, and the other end is communicated with corresponding suction hole, to be fixed by suction hole and insert suction. The insert pin for injection mould reduces the risk of insert falling off, and has high universality and simple structure.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to an insert for injection molds and an injection mold. Background Technology

[0002] In the field of injection molding, in order to make products have both the moldability of plastic and the functionality of materials such as metal and ceramic, inserts need to be embedded in the plastic matrix, which is the insert injection molding process.

[0003] In insert injection molding, cylindrical inserts rely solely on gravity and minimal friction for positioning along their axial direction. Even slight vibrations during mold closing or plastic impacts during injection can cause insert displacement or even detachment. Existing technologies utilize magnetic attraction to fix inserts, but prolonged exposure to high temperatures during injection weakens the magnetic force of the material, leading to insufficient fixing force over extended use and a continued risk of insert detachment. Furthermore, magnetic fixing only works for metal inserts and is completely ineffective for non-metallic inserts, limiting its applicability.

[0004] Therefore, there is an urgent need to propose an insert for injection molds and an injection mold to solve the above-mentioned technical problems. Utility Model Content

[0005] This invention provides an insert pin and an injection mold for injection molding, which greatly reduces the risk of insert detachment. It is applicable not only to metal inserts but also to inserts of other materials, making it highly versatile. In addition, it has a simple structure, is easy to process, and has a low cost.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Insert pins for injection molds include an insert pin body. One end of the insert pin body is used to install on the moving mold or stationary mold of the injection mold. The other end of the insert pin body has a mounting part and an abutment surface circumferentially arranged on the end face of the mounting part. The mounting part is used to be inserted into an insert. The end face of the insert abuts against the abutment surface. A plurality of suction holes are spaced apart circumferentially on the abutment surface.

[0008] The insert body has a main gas channel and multiple sub-gas channels inside. One end of the main gas channel is a suction port, which is located on the side of the insert body and is used to connect to a vacuum device. The other end of the main gas channel is close to the mounting part. The sub-gas channels are arranged one-to-one with the adsorption holes. One end of the sub-gas channel is connected to the main gas channel, and the other end is connected to the corresponding adsorption hole, so as to adsorb and fix the insert through the adsorption hole.

[0009] Optionally, the adsorption pore is an elongated arc-shaped pore.

[0010] Optionally, along the radial direction of the pin body, the width of the adsorption hole is A, and the width of the abutting surface is B, where A > (1 / 2)B.

[0011] Optionally, the plurality of adsorption holes are arranged at equal intervals along the circumference of the contact surface;

[0012] And / or, a guide slope is provided on the periphery of the end of the mounting part away from the insert body, the guide slope being used to guide the installation of the insert.

[0013] Optionally, the mounting portion has a groove on its periphery, and an elastic element is provided in the groove. At least a portion of the elastic element can elastically extend out of or retract from the groove. When the insert is installed in the mounting portion, the elastic element elastically abuts against the inner wall of the insert.

[0014] Optionally, the elastic element includes an elastic abutment portion and a fixing portion located at both ends of the elastic abutment portion. The elastic abutment portion can elastically extend or retract into the groove. The bottom of the groove has snap-fit ​​grooves at both ends along the length direction, and the fixing portion engages with the corresponding snap-fit ​​groove.

[0015] Optionally, the sub-gas channel includes a sub-axial channel and a sub-radial channel. The sub-radial channel extends from the side of the needle body along the radial direction of the needle body to communicate with the main gas channel. A first sealing element is provided at the first opening on the side of the needle body of the sub-radial channel, and the first sealing element seals and blocks the first opening. The sub-axial channel extends from the adsorption hole along the axial direction of the needle body to communicate with the sub-radial channel.

[0016] Optionally, the main gas channel includes a main axial channel and a main radial channel. The main radial channel extends from the intake port along the radial direction of the pin body to the middle position of the pin body. The main axial channel extends from the end face of the mounting part away from the pin body along the axial direction of the pin body to communicate with the main radial channel. A second sealing element is provided in the main axial channel inside the mounting part, and the second sealing element seals and blocks the end of the main axial channel near the mounting part.

[0017] Optionally, the main axial channel is provided with a positioning mating part at the second opening on the end face of the mounting part, the positioning mating part being configured to be inserted into the positioning pin at the end of the robotic arm, the robotic arm being used to install the insert.

[0018] An injection mold includes a moving mold, a stationary mold, and an injection mold insert as described in any of the above technical solutions, wherein one end of the insert body of the injection mold insert is mounted on the moving mold or the stationary mold.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention provides an insert for injection molds. In use, the insert is first fitted onto the mounting portion of the insert body until its end face abuts against the contact surface of the insert body. Then, a vacuum device is activated. The vacuum device creates negative pressure at multiple adsorption holes on the contact surface through the main gas channel and multiple sub-gas channels within the insert body, thereby adsorbing and fixing the insert. That is, this injection mold insert uses adsorption to fix the insert. Compared with existing magnetic fixing methods, its adsorption effect remains almost unchanged after long-term use, greatly reducing the risk of insert detachment. Furthermore, it is suitable not only for metal inserts but also for inserts of other materials, exhibiting high versatility. In addition, this injection mold insert has a simple structure, is easy to manufacture, and has a low cost.

[0021] This utility model also provides an injection mold, including a moving mold, a stationary mold, and the aforementioned injection mold insert. Because this injection mold uses the aforementioned injection mold insert, it reduces downtime for adjustments and product scrap caused by insert detachment, thereby improving production efficiency, reducing product dimensional deviations or functional defects caused by insert displacement, and improving production quality. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of an insert pin for an injection mold provided in an embodiment of this utility model;

[0023] Figure 2 An assembly drawing of inserts and pins for injection molds provided for embodiments of this utility model;

[0024] Figure 3 A side view of an insert pin for an injection mold provided in an embodiment of this utility model;

[0025] Figure 4 A front view of an insert pin for an injection mold provided in an embodiment of this utility model;

[0026] Figure 5 for Figure 4 Sectional view along line AA;

[0027] Figure 6 for Figure 4 Sectional view along line BB;

[0028] Figure 7 A cross-sectional view of another injection mold insert provided in an embodiment of this utility model;

[0029] Figure 8 A cross-sectional view of another injection mold insert provided for an embodiment of this utility model (elastic element not shown).

[0030] In the picture:

[0031] 10. Inserts;

[0032] 100. Insert pin body; 110. Abutment surface; 111. Adsorption hole; 120. Main gas channel; 121. Inlet; 122. Main axial channel; 123. Main radial channel; 124. Positioning mating part; 125. Second seal; 130. Sub-gas channel; 131. Sub-axial channel; 132. Sub-radial channel; 133. First opening;

[0033] 200. Mounting part; 210. Guide slope; 220. Groove; 221. Snap-fit ​​groove; 230. Elastic element; 231. Elastic abutment part; 232. Fixing part. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0038] In this utility model, "multiple" refers to two or more (including two).

[0039] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0040] Example 1

[0041] This embodiment provides an insert for injection molds, which uses adsorption to fix the insert, resulting in good adsorption effect and greatly reducing the risk of insert falling off. Furthermore, it is applicable not only to metal inserts but also to inserts of other materials, demonstrating high versatility. In addition, it has a simple structure, is easy to manufacture, and has low cost.

[0042] See Figures 1-5The injection mold insert includes an insert body 100. One end of the insert body 100 is used to install on the moving or stationary mold of the injection mold. The other end of the insert body 100 has a mounting portion 200 and an abutment surface 110 circumferentially arranged around the bottom of the mounting portion 200. The mounting portion 200 is used to insert into the insert 10. The end face of the insert 10 abuts against the abutment surface 110. A plurality of suction holes 111 are spaced apart circumferentially on the abutment surface 110. The insert body 100 has a main gas channel 120 and a plurality of sub-gas channels 130 inside. One end of the main gas channel 120 is a suction port 121, which is located on the side of the insert body 100 and is used to connect to a vacuum pump. The other end of the main gas channel 120 is close to the mounting portion 200. Sub-gas channels 130 are configured one-to-one with adsorption holes 111. One end of a sub-gas channel 130 is connected to a main gas channel 120, and the other end is connected to the corresponding adsorption hole 111, so that the insert 10 can be adsorbed and fixed through the adsorption hole 111. One main gas channel 120 is connected to multiple sub-gas channels 130. This "main trunk-branch" flow channel structure allows the negative pressure to be efficiently and evenly distributed to each adsorption hole 111, thereby forming a stable adsorption force on the contact surface 110.

[0043] Understandably, when using this insert, the insert 10 is first fitted onto the mounting portion 200 of the insert body 100 until the end face of the insert 10 abuts against the abutting surface 110 of the insert body 100 (e.g., Figure 2 (As shown), the vacuum equipment is then activated. The vacuum equipment creates negative pressure at multiple adsorption holes 111 on the contact surface 110 through the main gas channel 120 and multiple sub-gas channels 130 within the insert body 100. This negative pressure then adsorbs and fixes the insert 10. In other words, this injection mold insert uses adsorption to fix the insert 10. Compared to existing magnetic fixing methods, its adsorption effect remains almost unchanged after long-term use, greatly reducing the risk of the insert 10 falling off. Furthermore, this injection mold insert is suitable not only for metal inserts but also for inserts of other materials, exhibiting high versatility. Additionally, this injection mold insert has a simple structure, is easy to manufacture, and has a low cost. By setting multiple adsorption holes 111, adsorption forces can be applied to the insert 10 simultaneously from multiple locations, forming a uniformly distributed adsorption force field. This effectively resists vibrations during mold closing or impacts from the plastic during injection, ensuring the stability of the insert 10 during the injection molding process.

[0044] Optionally, in one possible embodiment, the cross-sectional area of ​​the main gas channel 120 is larger than the cross-sectional area of ​​each sub-gas channel 130. The larger cross-sectional area ensures that the vacuum negative pressure can be quickly and evenly distributed to each sub-gas channel 130, thereby ensuring that uniform and stable adsorption forces can be generated synchronously at all adsorption pores 111.

[0045] Optionally, see Figure 3 In one possible embodiment, the adsorption hole 111 is an elongated arc-shaped hole. Compared with circular holes or dot-like arrangements, the elongated arc-shaped hole increases the circumferential length of the adsorption hole 111 along the contact surface 110, forming a continuous linear adsorption band, effectively increasing the adsorption area, and achieving more uniform and stable adsorption of the insert 10.

[0046] Optionally, see [link to relevant documentation] Figure 3 In one possible embodiment, along the radial direction of the insert body 100, the width of the adsorption hole 111 is A, and the width of the abutment surface 110 is B, where A > (1 / 2)B. This configuration, on the one hand, allows the adsorption hole 111 to achieve a larger width within a limited radial space, significantly increasing the adsorption area of ​​the adsorption hole 111; on the other hand, the large adsorption hole 111 causes the adsorption force generated at this location to be closer to the inner and outer edges of the insert 10 end face, thereby ensuring the rigidity and stability of the adsorption fixation.

[0047] Further, see also Figure 3 Multiple adsorption holes 111 are evenly spaced along the circumference of the contact surface 110. With this arrangement, the adsorption force can be evenly distributed along the circumference of the contact surface 110, thereby achieving stable and omnidirectional adsorption of the insert 10 without eccentricity.

[0048] Optionally, see [link to relevant documentation] Figure 3 In one possible embodiment, the adsorption pores 111 are provided with 4. In other embodiments, the adsorption pores 111 may also be provided with 2, 6, 8 or more, depending on actual needs, and this application does not make specific limitations.

[0049] Optionally, see Figure 5 In one possible embodiment, the sub-gas channel 130 includes a sub-axial channel 131 and a sub-radial channel 132. The sub-radial channel 132 extends from the side of the needle body 100 along the radial direction of the needle body 100 to communicate with the main gas channel 120. A first seal (not shown) is provided at the first opening 133 on the side of the needle body 100 in the sub-radial channel 132, and the first seal seals and blocks the first opening 133. The sub-axial channel 131 extends from the adsorption hole 111 along the axial direction of the needle body 100 to communicate with the sub-radial channel 132. By correspondingly machining the sub-axial channel 131 at the adsorption hole 111 and machining the sub-radial channel 132 on the side of the needle body 100, the complex internal channel is divided into the easily machined sub-axial channel 131 and sub-radial channel 132, which then intersect and communicate, reducing the machining difficulty and cost of deep holes and irregular holes. By sealing the first opening 133 with the first sealing element, a complete and sealed negative pressure transmission path is formed, that is, one end of the sub-gas channel 130 is connected to the main gas channel 120, and the other end is connected to the adsorption hole 111.

[0050] Furthermore, an internal thread can be provided at the first opening 133, and a bolt can be provided as the first sealing element. The bolt seals the first opening 133 through the internal thread. The structure is simple, easy to assemble, and has good sealing performance.

[0051] Optionally, see Figure 6 In one possible embodiment, the main gas passage 120 includes a main axial passage 122 and a main radial passage 123. The main radial passage 123 extends from the intake port 121 along the radial direction of the pin body 100 to the middle position of the pin body 100. The main axial passage 122 extends from the end face of the mounting portion 200 away from the pin body 100 along the axial direction of the pin body 100 to communicate with the main radial passage 123. A second seal 125 is provided in the main axial passage 122 inside the mounting portion 200, and the second seal 125 seals and blocks the main axial passage 122 located at one end of the mounting portion 200. By correspondingly machining the main radial passage 123 at the intake port 121 and machining the main axial passage 122 on the end face of the mounting portion 200 away from the pin body 100, the complex internal passage is divided into the easily machined main axial passage 122 and the main radial passage 123, which then intersect and communicate, reducing the machining difficulty and cost of deep holes and irregular holes. The second sealing element 125 seals the mating surface between the mounting part 200 and the insert body 100, forming a complete and sealed negative pressure transmission path, that is, one end of the main gas channel 120 is connected to each sub-gas channel 130, and the other end is connected to the intake port 121.

[0052] Understandably, see Figure 5 and Figure 6 By dividing the gas channel into a main gas channel 120 and a sub-gas channel 130, and further dividing it into a main radial channel 123, a main axial channel 122, a sub-radial channel 132, and a sub-axial channel 131, a long and complex three-dimensional gas channel system is decomposed into multiple interconnected straight channels, greatly reducing the processing difficulty. Based on this design, the adsorption hole 111 can preferably be arranged at any position on the contact surface 110.

[0053] Understandably, in order to achieve precise installation, the insert 10 can be installed on the mounting part 200 by a robotic arm.

[0054] Optionally, see Figure 1 and Figure 2In one possible embodiment, a positioning mating part 124 is provided at the second opening on the end face of the mounting portion 200 of the main axial channel 122. The positioning mating part 124 is configured to engage with a positioning pin at the end of a robotic arm, which is used to install the insert 10. The engagement between the positioning mating part 124 and the robotic arm improves the installation accuracy of the insert 10 during automated assembly, thereby improving the processing efficiency of the injection mold. Furthermore, by placing the positioning mating part 124 at the opening on the end face of the mounting portion 200 of the main axial channel 122, the structure of the main axial channel 122 is fully utilized, reducing the processing difficulty of the positioning mating part 124 to a certain extent.

[0055] Further, see also Figure 6 In one possible embodiment, the positioning mating part 124 is a positioning hole with a diameter larger than that of the main axial channel 122, and the diameter of the portion of the positioning hole near the end face of the mounting part 200 is larger than the diameter of the portion away from the end face of the mounting part 200. This arrangement facilitates the insertion of the positioning pin at the end of the robotic arm.

[0056] Optionally, see Figure 1 and Figure 4 In one possible embodiment, a guide ramp 210 is provided on the periphery of the end of the mounting portion 200 away from the insert body 100. The guide ramp 210 is used to guide the installation of the insert 10. The guide ramp 210 can guide the insert 10 to slide into the correct installation position when installing the insert 10, reducing the assembly difficulty and dependence on operational precision, and improving the installation efficiency of the insert 10.

[0057] Example 2

[0058] This embodiment provides an insert pin for injection molds, which has a largely the same structure as that of Embodiment 1, with improvements only. Therefore, only the differences between the two are described here, and the structures identical to those in Embodiment 1 will not be repeated. In this embodiment, the same or corresponding technical features as in Embodiment 1 are referred to by the same reference numerals.

[0059] Based on the aforementioned reliable vacuum adsorption fixation, in order to further enhance the multi-dimensional fixation capability of the injection mold insert under complex working conditions, this embodiment optimizes the mounting part 200 by adding a mechanical snap-fit ​​fixing structure, which together with vacuum adsorption forms a composite fixation solution.

[0060] See Figure 7The mounting portion 200 of the injection mold insert provided in this embodiment has a groove 220 on its periphery. An elastic element 230 is provided within the groove 220. At least a portion of the elastic element 230 can elastically extend or retract from the groove 220. When the insert 10 is installed in the mounting portion 200, the elastic element 230 elastically abuts against the inner wall of the insert 10. By applying a continuous elastic pushing force to the inner wall of the insert 10 in the radial direction through the elastic element 230, the risk of the insert 10 slightly wobbling radially or moving axially during mold closing or injection molding is further reduced. Simultaneously, the combination of the elastic abutment of the elastic element 230 and vacuum adsorption provides multi-directional fixation of the insert 10 in both the axial and radial directions, improving the connection rigidity and stability between the insert 10 and the insert body 100, and significantly enhancing the injection mold's ability to resist multi-directional interference forces under complex working conditions.

[0061] Alternatively, two, four or more grooves 220 may be symmetrically arranged along the periphery of the mounting portion 200, depending on actual needs, and this application does not impose specific limitations.

[0062] Optionally, see [link to relevant documentation] Figure 7 In one possible embodiment, the elastic element 230 includes an elastic abutment portion 231 and fixing portions 232 located at both ends of the elastic abutment portion 231. The elastic abutment portion 231 can elastically extend or retract into the groove 220. The bottom of the groove 220 has snap-fit ​​grooves 221 at both ends along the length direction, and the fixing portions 232 engage with the corresponding snap-fit ​​grooves 221. The installation of the elastic element 230 in the groove 220 is completed through a simple snap-fit ​​action, simplifying the installation process. At the same time, it facilitates quick replacement when the elastic element 230 fails, improving the maintainability and service life of the equipment.

[0063] Example 3

[0064] This embodiment provides an injection mold, including a moving mold, a stationary mold, and an injection mold insert provided in Embodiment 1 or Embodiment 2. One end of the insert body 100 of the injection mold insert is installed on the moving mold or the stationary mold.

[0065] Because the injection mold uses the aforementioned injection mold insert, it reduces downtime for adjustments and product scrap caused by insert 10 falling off, improves production efficiency, reduces product size deviations or functional defects caused by insert 10 displacement, and improves production quality.

[0066] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pin for injection molds, characterized in that, The device includes a pin body (100), one end of which is used to be installed in the moving mold or stationary mold of the injection mold. The other end of the pin body (100) has a mounting part (200) and an abutment surface (110) circumferentially arranged around the bottom of the mounting part (200). The mounting part (200) is used to be inserted into the insert (10). The end face of the insert (10) abuts against the abutment surface (110). The abutment surface (110) has a plurality of suction holes (111) spaced apart circumferentially. The insert body (100) is provided with a main gas channel (120) and a plurality of sub-gas channels (130) inside. One end of the main gas channel (120) is a suction port (121), which is located on the side of the insert body (100) and is used to connect to a vacuum device. The other end of the main gas channel (120) is close to the mounting part (200). The sub-gas channels (130) are arranged one-to-one with the adsorption holes (111). One end of the sub-gas channel (130) is connected to the main gas channel (120), and the other end is connected to the corresponding adsorption hole (111) so as to adsorb and fix the insert (10) through the adsorption hole (111).

2. The insert for injection molds according to claim 1, characterized in that, The adsorption pore (111) is a long arc-shaped pore.

3. The insert for injection molds according to claim 2, characterized in that, Along the radial direction of the insert body (100), the width of the adsorption hole (111) is A, and the width of the abutting surface (110) is B, where A > (1 / 2)B.

4. The insert for injection molds according to claim 1, characterized in that, The plurality of adsorption holes (111) are equally spaced along the circumference of the contact surface (110); And / or, the mounting portion (200) has a guide slope (210) on the periphery of the end away from the insert body (100), the guide slope (210) being used to guide the installation of the insert (10).

5. The insert for injection molds according to any one of claims 1-4, characterized in that, The mounting portion (200) has a groove (220) on its periphery, and an elastic element (230) is provided in the groove (220). At least a portion of the elastic element (230) can elastically extend out of or retract from the groove (220). When the insert (10) is installed in the mounting portion (200), the elastic element (230) elastically abuts against the inner wall of the insert (10).

6. The insert for injection molds according to claim 5, characterized in that, The elastic element (230) includes an elastic abutment portion (231) and a fixing portion (232) located at both ends of the elastic abutment portion (231). The elastic abutment portion (231) can elastically extend or retract from the groove (220). The bottom of the groove (220) is provided with a snap-fit ​​groove (221) at both ends along the length direction. The fixing portion (232) engages with the corresponding snap-fit ​​groove (221).

7. The insert for injection molds according to any one of claims 1-4, characterized in that, The sub-gas channel (130) includes a sub-axial channel (131) and a sub-radial channel (132). The sub-radial channel (132) extends from the side of the needle body (100) along the radial direction of the needle body (100) to communicate with the main gas channel (120). The sub-radial channel (132) is provided with a first sealing element at the first opening (133) on the side of the needle body (100). The first sealing element seals and blocks the first opening (133). The sub-axial channel (131) extends from the adsorption hole (111) along the axial direction of the needle body (100) to communicate with the sub-radial channel (132).

8. The insert for injection molds according to any one of claims 1-4, characterized in that, The main gas passage (120) includes a main axial passage (122) and a main radial passage (123). The main radial passage (123) extends from the intake port (121) along the radial direction of the pin body (100) to the middle position of the pin body (100). The main axial passage (122) extends from the end face of the mounting part (200) away from the pin body (100) along the axial direction of the pin body (100) to communicate with the main radial passage (123). A second seal (125) is provided in the main axial passage (122) inside the mounting part (200). The second seal (125) seals and blocks one end of the main axial passage (122) near the mounting part (200).

9. The insert for injection molds according to claim 8, characterized in that, The main axial channel (122) is provided with a positioning mating part (124) at the second opening on the end face of the mounting part (200). The positioning mating part (124) is configured to be inserted into the positioning pin at the end of the robotic arm, which is used to install the insert (10).

10. An injection mold, characterized in that, The mold includes a moving mold, a stationary mold, and an injection mold insert according to any one of claims 1-9, wherein one end of the insert body (100) of the injection mold insert is mounted on the moving mold or the stationary mold.

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