An injection mold

Abstract

The present invention discloses an injection mold, comprising a rear mold and a slider. The slider moves to complete core pulling or mold closing. A product molding cavity is provided at the end of the slider in the sliding direction. The product molding cavity is provided with a product ejector pin that is used in conjunction with the product ejector pin and rises and falls with the product ejector pin. The slider is provided with a through hole for the upper portion of the safety ejector pin to pass through. When the product ejector pin is fully retracted, the safety ejector pin is synchronously and completely withdrawn from the through hole. The limiter assembly includes a telescopic pin that is telescopically arranged in the rear mold. The slider is provided with a limiter hole that plugs into and cooperates with the telescopic pin. The slider moves to pull the core, driving the limiter hole to move to a position relative to the telescopic pin. The telescopic pin extends and plugs into the limiter hole. This application can prevent damage to the safety ejector pin caused by the movement of the slider, thereby ensuring the long-term and stable use of the safety ejector pin.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic parts production, in particular to an injection mold. Background Art

[0002] like Figure 9 The following figure shows a common injection molded part, primarily used in electronic products. This type of component is relatively complex, leading to the design of an ejector pin beneath the rear mold slider during mold design. After the product is molded, the slider is first pulled out a certain distance to complete the core-pulling action. The ejector pin then ejects the molded product. After ejection, the ejector pin returns to its original position, and the rear mold slider returns to the closed state under the action of the pull rod and the clamping force of the front and rear molds.

[0003] However, during the production process, the product ejector pin may not be able to fully return to its original position. If the front and rear molds continue to close at this time, the slider and the ejector pin may collide, causing damage to the slider or the ejector pin, ultimately shortening the service life of the mold. To address this issue, in the prior art, a safety ejector pin is used to limit the slider. The safety ejector pin rises and falls synchronously with the product ejector pin. When the product ejector pin is not lowered into place, the safety ejector pin is also not lowered into place. The safety ejector pin cooperates with the slider. If the safety ejector pin is not lowered into place, the slider and the safety ejector pin are plugged in, and the slider cannot move. Therefore, the slider will not move and damage the product ejector pin when the product ejector pin is not lowered into place.

[0004] In order to make the safety thimble and the slider fit together, the size of the safety thimble will be appropriately smaller than the socket of the slider, so that the sliding distance of the slider can have a certain error, and both can ensure that the safety thimble can smoothly pass through the slider. This structure is prone to damage the upper part of the safety thimble during the sliding process of the slider. In severe cases, it will cause the connection between the safety thimble and the socket of the slider to fail, and there is also the problem of frequent replacement of the safety thimble. To avoid damage to the safety thimble, the gap between the safety thimble and the socket can be appropriately reduced, that is, the width of the safety thimble can be increased to increase the deformation resistance of the safety thimble. However, this method requires ensuring that the slider moves a certain distance each time, so that the socket can be just opposite the safety thimble. It is necessary to ensure that the sliding of the slider needs to be positioned. For this reason, it is necessary to have an injection mold that can ensure the limited sliding of the slider. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides an injection mold, which solves the problem in the prior art that the safety ejector pin is easily damaged or inconveniently matched with the safety ejector pin when the slide is matched with the safety ejector.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solution: an injection mold, comprising a rear mold, a slider arranged for sliding on the rear mold, the slider moving to complete core pulling or mold closing, a product molding cavity being provided at the end of the slider in the sliding direction, the product molding cavity being provided with a product ejector for use and vertically lifting, and a protective mechanism comprising a safety ejector and a limit assembly.

[0007] The safety ejector is parallel to the product ejector and rises and falls with the product ejector. The slider is provided with a through hole for the upper part of the safety ejector to pass through. When the product ejector is fully retracted, the safety ejector is also fully withdrawn from the through hole at the same time.

[0008] The limiting component includes a telescopic pin telescopically arranged in the rear mold, and a limiting hole is provided on the slider to be plugged into the telescopic pin. The slider moves by pulling out the core, driving the limiting hole to move to the relative position of the telescopic pin, and the telescopic pin extends and plugs into the limiting hole.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] In addition to the existing safety pins for protecting product ejectors, this application also incorporates a limiter assembly to limit the movement of the slider, ensuring that the safety pin can be smoothly inserted into the through-hole. The retractable pin can be a spring plunger as is conventionally used. The retractable pin can be used to position the slider's travel distance so that the safety pin can smoothly pass through the through-hole. In this case, appropriately increasing the size of the safety pin can increase its deformation resistance, thereby preventing damage to the safety pin from slider movement and ensuring long-term, stable use of the safety pin.

[0011] Furthermore, the telescopic pin is telescopically arranged in the mounting hole on the rear mold, and the upper part of the telescopic pin is in a wedge-shaped structure. The slider core moves, driving the telescopic pin to shrink in the mounting hole opened on the rear mold. The movement of the slider drives the limit hole to move, and the limit hole moves above the telescopic pin. The telescopic pin extends out of the mounting hole and is plugged into the limit hole.

[0012] Furthermore, the limiting assembly further includes a limiting member, which is used to limit the telescopic distance of the telescopic pin;

[0013] The limiter is used in conjunction with the safety ejector. When the safety ejector has not completely withdrawn from the through hole, the limiter limits the moving distance of the telescopic pin so that at least part of the telescopic pin is plugged into the limit hole, limiting the sliding distance between the slider and the rear mold.

[0014] Furthermore, the limiting member includes a limiting column, one horizontal end of which contacts the safety ejector pin and the other end is connected to the mounting hole. The safety ejector pin rises, forcing the limiting column to move, so that the limiting column part contacts the telescopic pin, which is used to limit the moving distance of the telescopic pin.

[0015] Furthermore, a guide bevel is provided at one end of the limit column that contacts the safety ejector pin. The safety ejector pin is a special-shaped rod structure with a small upper part and a large lower part. The contact side of the safety ejector pin and the limit column is provided with a transition bevel used in conjunction with the guide bevel. The safety ejector pin moves so that the end of the limit column contacts the upper part or the lower middle part of the safety ejector pin.

[0016] Furthermore, a return spring is provided at the bottom of the telescopic pin, and the return spring is fixed in the mounting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram showing the positional relationship between the slider, the rear mold, and the injection molded part in the mold closing state in the present invention;

[0018] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0019] Figure 3 This is a diagram showing the positional relationship between the slider, the rear mold, and the injection molded part in the core-pulling state of the present invention;

[0020] Figure 4 for Figure 3 Enlarged view of middle part B;

[0021] Figure 5 This is a schematic structural diagram of the slider in the present invention cooperating with the rear mold in the mold closing state;

[0022] Figure 6 for Figure 5 Enlarged view of middle C part;

[0023] Figure 7 It is a structural schematic diagram of the slider in the present invention cooperating with the rear mold in the core-pulling state;

[0024] Figure 8 for Figure 7 Enlarged view of the middle D part;

[0025] Figure 9 This is a schematic structural diagram of the injection molded part produced by the present invention.

[0026] In the figure: rear mold 100, product molding cavity 110, slide groove 120, mounting hole 130, connecting hole 140, injection molded part 200, slider 300, guide hole 310, through hole 320, insert 330, limit hole 340, main product ejector pin 420, by-product ejector pin 410, safety ejector pin 500, transition slope 510, telescopic pin 600, plug-in part 610, sliding part 620, return spring 630, limit column 800, action spring 810, guide slope 820. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] like Figure 1 、 3 As shown in Figures 5 and 7, the present application provides an injection mold for producing the injection molded part 200 shown in the figure. The overall structure of the mold is equivalent to that of existing molds, including a front mold, a rear mold 100, a mold core, and a cooling system. The present application mainly improves the structure of the rear mold 100 to prevent the product ejector from being damaged by the slider 300 due to mold closing when the mold is not fully retracted.

[0029] To this end, the injection mold in this application mainly includes a rear mold 100, on which a slider 300 is provided for sliding. The slider 300 slides in a slide groove 120 on the rear mold 100. The sliding mode of the slider 300 can be various, such as Figure 1 、 2 As shown in Figures 3, 4, 5, and 7, in the present application, an inclined guide post (not shown) is used in conjunction with an inclined guide hole 310 on the slider 300. During the movement of the rear mold 100, the guide hole 310, under the action of the guide post, can move the slider 300 along the slide groove 120. An insert 330 is provided at the end of the slider 300. The movement of the slider 300 drives the insert 330 to move to complete the core pulling or mold closing operation. The slider 300 slides in the horizontal direction. A product molding cavity 110 is provided at the end of the slider 300 in the sliding direction. The product molding cavity 110 is the cavity in the lower half. The product molded in the product molding cavity 110 needs to be demolded. For this purpose, a product ejector that is used in conjunction with the product and can be lifted vertically is provided in the product molding cavity 110. The number of product ejectors can be set according to the structural characteristics of the product to ensure that the product ejector can eject the product smoothly. In this embodiment, there are five product pins, one main product pin 420 and four subsidiary product pins 410. The four subsidiary product pins 410 are grouped in pairs and are located on both sides behind the main product pin 420. The main product pin 420 is used in conjunction with the slider 300. Therefore, the limiting mechanism provided in this application is actually used to protect the main product pin 420. This application mainly describes the positional relationship and coordination relationship between the main product pin 420 and other components.

[0030] In order to prevent the main product ejector pin 420 from being damaged during use, the present application also provides a protection mechanism, which includes a safety ejector pin 500 and a limit assembly. Figure 5 、 7As shown, safety pin 500 is equivalent to safety pin 500 in the prior art and primarily serves to limit the position of slider 300. When slider 300 is pulled out of the core, through-hole 320 formed in slider 300 is positioned above safety pin 500. Safety pin 500 is parallel to the product ejector pin and slides within rear mold 100, rising and falling synchronously with the product ejector pin. When the product ejector pin is fully retracted, safety pin 500 also fully exits through-hole 320. If the product ejector pin is not fully retracted, safety pin 500 also partially exits through-hole 320, thereby protecting the product ejector pin.

[0031] In order to make the safety ejector pin 500 have better anti-deformation ability, under the condition of a specific size of the through hole 320, the closer the size of the safety ejector pin 500 is to the through hole 320, the better the anti-deformation ability. At the same time, the smoothness of the insertion with the through hole 320 is worse. In order to ensure that the slider 300 and the safety ejector pin 500 can be smoothly inserted, the present application also provides a limit assembly, which includes a telescopic pin 600 telescopically arranged in the rear mold 100, and a limit hole 340 is provided on the slider 300 for inserting and cooperating with the telescopic pin 600. The slider 300 moves by pulling the core, driving the limit hole 340 to move to the relative position of the telescopic pin 600, and the telescopic pin 600 extends and inserts into the limit hole 340.

[0032] In addition to the existing safety pin 500 for protecting the product's ejector pin, this application also provides a limiter assembly to limit the movement of the slider 300, ensuring that the safety pin 500 can be smoothly inserted into the through-hole 320. The retractable pin 600 can be a spring plunger as known in the art. The retractable pin 600 can be used to determine the movement distance of the slider 300 so that the safety pin 500 can smoothly pass through the through-hole 320. In this case, appropriately increasing the size of the safety pin 500 can increase its deformation resistance, thereby preventing damage to the safety pin 500 caused by the movement of the slider 300, thereby ensuring the long-term and stable use of the safety pin 500.

[0033] In the present application, since the slider 300 reciprocates in the horizontal direction, the pin 600 will not be telescopically arranged in the mounting hole 130 on the rear mold 100 in other directions. Figure 5 、 6As shown in Figures 7 and 8, in this embodiment, the slider 300 slides horizontally on the rear mold 100, and the telescopic pin 600 is vertically arranged below the slider 300. The rear mold 100 is provided with a vertical mounting hole 130, and the telescopic pin 600 is at least partially located in the mounting hole 130. An elastic member, such as a spring, is provided between the telescopic pin 600 and the mounting hole 130 to enable the telescopic pin 600 to be retracted and extended under the action of an external force and the elastic member. In order to make the telescopic pin 600 and the limiting hole 340 plug and match, as shown in the figure, the upper part of the telescopic pin 600 is a wedge-shaped structure, and the limiting hole 340 is opened at the bottom of the slider 300. The limiting hole 340 is a wedge-shaped structure that matches the shape of the telescopic pin 600. The slider core moves, driving the telescopic pin 600 to shrink in the mounting hole 130 opened on the rear mold 100. The movement of the slider 300 drives the limiting hole 340 to move. The limiting hole 340 moves to above the telescopic pin 600. The telescopic pin 600 extends out of the mounting hole 130 and is plugged into the limiting hole 340 to achieve the positioning connection between the telescopic pin 600 and the slider 300.

[0034] In some cases, the size of the safety ejector pin 500 is smaller than the size of the through hole 320 (equivalent to the aperture), and the difference between the two is large. At this time, even with the positioning of the telescopic pin 600, the safety ejector pin 500 cannot be protected. The present application considers that when the safety ejector pin 500 is of a smaller size, the telescopic pin 600 can have a mobile protection effect on the safety ejector pin 500. To this end, the limit assembly of the present application also includes a limit member, which is used in conjunction with the safety ejector pin 500. When the safety ejector pin 500 has not completely exited the through hole 320, the limit member limits the moving distance of the telescopic pin 600, so that at least part of the telescopic pin 600 is plugged into the limiting hole 340, thereby limiting the sliding distance between the slider 300 and the rear mold 100. The present application utilizes a limiter to limit the telescopic distance of the telescopic pin 600, especially when the safety ejector 500 and the product ejector are not completely retracted. At this time, the limiter can prevent the telescopic pin 600 from completely retracting. The telescopic pin 600 is at least partially plugged into the limit hole 340, limiting the movement distance of the slider 300 along the rear mold 100. The impact force of the slider 300 on the safety ejector 500 is offset by the telescopic pin 600, thereby having a certain protective effect on the safety ejector 500.

[0035] In this application, in combination with the structure of the telescopic pin 600, in order to realize the limitation of the moving distance of the telescopic pin 600 by the limiter, the position relationship between the limiter and the telescopic pin 600 is as follows: Figure 5 、 6As shown in Figures 7 and 8, the mounting hole 130 is a stepped hole with a larger upper portion and a smaller lower portion. The telescopic pin 600 is located at the upper portion of the mounting hole 130. A return spring 630 is intercepted at the stepped position of the mounting hole 130. The lower end of the return spring 630 can be fixed to the stepped position of the mounting hole 130. The return spring 630 can also be directly placed at the stepped position of the mounting hole 130. Of course, the return spring 630 can also be fixed in other ways to limit its deformation direction. The upper portion of the return spring 630 contacts the bottom of the telescopic pin 600. When the telescopic pin 600 is subjected to external pressure, the telescopic pin 600 contracts to the upper portion of the mounting hole 130, and the return spring 630 is compressed. When the slider 300 moves to the limit hole 340 above the telescopic pin 600, the return spring 630 recovers its deformation, which can drive the upper portion of the telescopic pin 600 to plug into the limit hole 340. In this embodiment, the telescopic pin 600 includes an upper plug-in portion 610 and a lower sliding portion 620. The upper portion of the plug-in portion 610 is a wedge-shaped structure, and the sliding portion 620 is a rod-shaped structure. The sliding portion 620 passes through the return spring 630 and extends into the lower portion of the mounting hole 130. To limit the movement distance of the plug-in portion 610, the wedge-shaped structure of the plug-in portion 610 in this application is provided with a larger structure below the wedge-shaped structure, while the mounting hole 130 is provided with a closing structure at the top. The closing structure is adapted to the size of the wedge-shaped structure, so that under the action of the return spring 630, the wedge-shaped structure of the plug-in portion 610 extends out of the mounting hole 130, while the structure below the wedge-shaped structure of the plug-in portion 610 is located within the mounting hole 130.

[0036] In combination with the movement principle of the telescopic pin 600, when the slider 300 moves, the telescopic pin 600 can be extended and retracted in the mounting hole 130. When the safety ejector pin 500 is not fully retracted (equivalent to the product ejector pin not being fully retracted), the limiter needs to limit the movement of the telescopic pin 600 to protect the safety ejector pin 500. Based on the structure of the telescopic pin 600, the present application includes a limiter column 800. One horizontal end of the limiter column 800 contacts the safety ejector pin 500, and the other end is connected to the mounting hole 130. The safety ejector pin 500 rises, forcing the limiter column 800 to move, so that the limiter column 800 partially contacts the telescopic pin 600, which is used to limit the movement distance of the telescopic pin 600. Figure 5 、 6As shown in Figures 7 and 8, a connecting hole 140 is provided on the rear mold 100. One end of the connecting hole 140 is connected to the movable hole where the safety ejector pin 500 is located, and the other end of the connecting hole 140 is connected to the mounting hole 130. The limiting column 800 is horizontally slidably arranged in the connecting hole 140. The position of the connecting hole 140 must ensure that when the telescopic pin 600 is plugged into the limiting hole 340, the limiting column 800 extends into the mounting hole 130, and the limiting column 800 is exactly located at the plug-in portion 61 0, the telescopic pin 600 is limited by the limiting column 800, so that when the safety ejector 500 is not completely retracted, the telescopic pin 600 cannot be extended or retracted under the action of the movement of the slider 300. Conversely, if the telescopic pin 600 cannot be extended or retracted, the telescopic pin 600 and the limiting hole 340 are plugged into each other, so that the rear mold 100 and the slider 300 are locked, the safety ejector 500 is protected, and the safety ejector 500 is avoided from being damaged.

[0037] When the safety ejector 500 is in contact with the stop pin 500, a guide slope 820 is provided at one end of the stop pin 800 that contacts the safety ejector 500. The guide slope 820 is tilted downward. The safety ejector 500 has a special-shaped rod-shaped structure with a small upper portion and a large lower portion. A transition slope 510 is provided on the contact side of the safety ejector 500 and the stop pin 800 for use with the guide slope 820. The transition slope 510 connects the upper and lower portions of the safety ejector 500. When the safety ejector 500 moves upward, the stop pin 800 moves toward the mounting hole 130 under the action of the transition slope 510 until the end of the stop pin 800 contacts the larger position of the lower portion of the safety ejector 500. When the safety ejector 500 retracts, the stop pin 800 and the safety ejector 500 are abutted and contact the upper portion of the safety ejector 500 through the transition slope 510. It is only necessary to set the contact position between the limit column 800 and the upper part of the safety ejector pin 500 at the position where the top of the safety ejector pin 500 exits the through hole 320, so that the lifting and lowering of the safety ejector pin 500 can drive the movement of the limit column 800. Of course, in order to ensure that the limit column 800 has sufficient "pulling force" to resist the side wall of the safety ejector pin 500, such as Figure 5 、 7 As shown, the connecting hole 140 is a structure with one end larger than the other end, and the large end of the connection is adjacent to the safety ejector pin 500. The limiting column 800 is similar to a 7-shaped special-shaped structure with one end larger than the other end. The large end of the limiting column 800 cooperates with the safety ejector pin 500, and an action spring 810 is provided between the large end of the limiting column 800 and the small end of the connecting hole 140. The action spring 810 is a compression spring. The cooperation between the connecting hole 140 and the limiting column 800 of the specific structure can realize the limited sliding of the limiting column 800. At the same time, the action spring 810 can make the limiting column 800 and the side wall of the safety ejector pin 500 collide with each other, thereby achieving the setting purpose of this application.

[0038] Principles of this application:

[0039] After the injection molded part 200 is formed, the mold is opened, and the slider 300 slides on the rear mold 100 to realize the sliding core pulling operation. The sliding movement position is positioned by the telescopic pin 600. Then, the product ejector and the safety ejector 500 move synchronously, and the product ejector ejects the injection molded part 200 out of the product molding cavity 110 (such as Figure 3 As shown in the figure), the injection molded part 200 product is unloaded, and the mold needs to be closed after unloading. At this time, the product ejector and the safety ejector 500 are retracted synchronously. At this time, when the safety ejector 500 and the product ejector are not completely retracted, the cooperation between the safety ejector 500 and the limiting column 800 can enable the limiting column 800 to lock the telescopic pin 600, thereby achieving the locking of the rear mold 100 and the slider 300; at this time, if the safety ejector 500 and the product ejector are completely retracted, the limiting column 800 is reset under the action of the action spring 810, and the limiting pin is extended into the connecting hole 140. The telescopic pin 600 can be retracted and retracted under the action of sliding, completing the mold closing operation.

[0040] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An injection mold, comprising a rear mold (100), a slider (300) provided on the rear mold (100), the slider (300) moving to complete core pulling or mold closing, a product molding cavity (110) provided at the end of the slider (300) in the sliding direction, the product molding cavity (110) provided with a product ejector pin for use and vertically lifting, characterized in that: It also includes a protection mechanism, which includes a safety ejector pin (500) and a limit assembly. The safety ejector pin (500) is parallel to the product ejector pin and rises and falls with the product ejector pin. The slider (300) is provided with a through hole (320) for the upper part of the safety ejector pin (500) to pass through. When the product ejector pin is fully retracted, the safety ejector pin (500) is synchronously and fully withdrawn from the through hole (320). The limiting assembly includes a telescopic pin (600) telescopically arranged in the rear mold (100), a limiting hole (340) plugged and matched with the telescopic pin (600) is provided on the slider (300), the slider (300) moves by core pulling, driving the limiting hole (340) to move to a position relative to the telescopic pin (600), and the telescopic pin (600) extends and plugs into the limiting hole (340); The limiting assembly further comprises a limiting member, which is used to limit the telescopic distance of the telescopic pin (600); The limiting member is used in conjunction with the safety ejector pin (500). When the safety ejector pin (500) has not completely exited the through hole (320), the limiting member limits the moving distance of the telescopic pin (600), so that at least part of the telescopic pin (600) is plugged into the limiting hole (340), thereby limiting the sliding distance between the slider (300) and the rear mold (100); The limiting member comprises a limiting column (800), one horizontal end of the limiting column (800) contacts the safety ejector pin (500), and the other end is connected to the mounting hole (130). When the safety ejector pin (500) rises, the limiting column (800) is forced to move, so that a portion of the limiting column (800) contacts the telescopic pin (600), thereby limiting the moving distance of the telescopic pin (600).

2. The injection mold according to claim 1, characterized in that: The telescopic pin (600) is telescopically arranged in the mounting hole (130) on the rear mold (100). The upper part of the telescopic pin (600) is a wedge-shaped structure. The slider (300) moves by pulling the core, driving the telescopic pin (600) to shrink in the mounting hole (130) opened on the rear mold (100). The movement of the slider (300) drives the limiting hole (340) to move. The limiting hole (340) moves to the top of the telescopic pin (600), and the telescopic pin (600) extends out of the mounting hole (130) and is plugged into the limiting hole (340).

3. The injection mold according to claim 1 or 2, characterized in that: A guide slope (820) is provided at one end of the limiting column (800) that contacts the safety ejector pin (500). The safety ejector pin (500) is a special-shaped rod-shaped structure with a small upper portion and a large lower portion. A transition slope (510) used in conjunction with the guide slope (820) is provided on the contact side of the safety ejector pin (500) and the limiting column (800). When the safety ejector pin (500) moves, the end of the limiting column (800) contacts the upper portion or the middle and lower portion of the safety ejector pin (500).

4. The injection mold according to claim 3, characterized in that: A return spring (630) is provided at the bottom of the telescopic pin (600), and the return spring (630) is fixed in the mounting hole (130).

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