An injection mold

Abstract

The present application provides a kind of injection mold, belong to mold technical field.It solves the technical problem that product is damaged due to material handle breakage and fly out when existing injection mold demoulds.This injection mold includes fixed mould and movable mould, the gate and strip-shaped feed flow channel are between the fixed mould and movable mould, the material handle ejector rod that relatively movable mould reciprocates is inserted in movable mould, the position of the material handle ejector rod is opposite along axial direction with the feed flow channel, it is characterized in that, the end face edge of the material handle ejector rod towards one end of the fixed mould is provided with hooking material gap, the inner wall of the hooking material gap has limit surface, the limit surface is inclined along the length direction of material handle ejector rod and away from the side where the fixed mould is located, the hooking material gap penetrates the material handle ejector rod along the setting direction of the feed flow channel or the inner wall of the hooking material gap only towards the side where the gate is located along the setting direction of the feed flow channel.The present application can avoid material handle breakage when demoulding and further guarantee product quality.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to an injection mold. Background Art

[0002] The mold gate, also known as the feed port, refers to a section of the passage from the branch channel to the mold cavity. It is the smallest and shortest section in the casting system. After molding is completed, the gate is the first to solidify and seal. It has the function of preventing the feed from flowing back and preventing the cavity pressure from dropping too quickly, which may cause shrinkage and depression in the molded product. The handle is the part of the molten injection molding material left in the feed runner. When the injection molded product is demolded, the handle needs to be ejected from the mold at the same time to protect the injection molded product. The handle ejector is used to simultaneously lift the handle part when the injection molded product is ejected from the mold to prevent the handle from breaking and affecting the appearance of the injection molded product. During the injection molding and demolding process, it is often necessary to eject the handle at the gate and the injection molded product at the same time, and then perform the gate trimming operation to ensure the surface quality of the product.

[0003] The patent with authorization announcement number CN211440969U discloses a curved arc gate glue feeding system, including a runner arranged in the gate sleeve on the fixed mold core and a runner arranged in the movable mold core. The runner in the movable mold core includes an arc-shaped runner and a straight runner. The arc-shaped runner is arranged in the gate insert on the movable mold core, and a gate is provided on the gate insert. The curvature of the arc-shaped runner gradually increases from the glue feeding port to the straight runner, and a trapezoidal curved groove is provided on the straight runner.

[0004] While the above structure ensures the quality of injection molded parts, a mismatch between the ejection timing of the mold handle and the ejection timing of the molded part can still lead to breakage at the gate, causing the mold handle to fly out and affecting the surface quality of the molded part. To address this, those skilled in the art can easily consider: 1. Introducing a synchronization mechanism between the ejector pin of the injection molded part and the ejector pin of the mold handle to ensure precise and synchronized ejection; 2. Increasing the strength of the gate to reduce the probability of breakage. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned problems existing in the prior art and provides an injection mold. The technical problem to be solved by the present invention is: how to avoid the breakage of the material handle during demoulding and thus ensure the product quality.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An injection mold comprises a fixed mold and a movable mold, with a gate and a strip-shaped feed channel between the fixed mold and the movable mold, a material handle push rod that can reciprocate relative to the movable mold is inserted into the movable mold, and the material handle push rod is axially opposite to the position of the feed channel, and is characterized in that a hooking notch is provided at the edge of the end face of the material handle push rod facing one end of the fixed mold, and the inner wall of the hooking notch has a limiting surface, and the limiting surface is inclined toward the side away from the fixed mold along the length direction of the material handle push rod, and the hooking notch passes through the material handle push rod or the inner wall of the hooking notch along the setting direction of the feed channel and only faces the side where the gate is located.

[0008] The fixed mold and the movable mold can be closed to form the product in the cavity between the two. The molten injection plastic can pass through the feed runner and the gate and then enter the mold cavity. The size of the gate is smaller than that of the feed runner, which is conducive to reducing the difficulty of processing the product surface when processing the gate after the product is formed. The material handle ejector pin can eject the material handle formed in the feed runner when the mold is opened and demoulded; by providing a hook notch on the edge of the end face of the material handle ejector pin facing the fixed mold, and providing a limiting surface inclined along the length direction of the material handle ejector pin toward the side away from the fixed mold on the inner wall of the hook notch, since the area where the material handle ejector pin is located can be connected to the feed runner, the molten material in the feed runner can flow into the hook notch and the movable mold outside the material handle ejector pin during injection molding, and harden and mold during the demolding cooling stage. The material handle molded in the feed runner will be integrated with the part located in the hook notch, and the injection molding located in the hook notch The material will be limited in the axial direction by the material handle push rod under the constraint of the movable mold and the limiting surface of the inner wall of the material hook gap. That is, the material handle will be pulled by the material handle push rod in the initial stage of ejecting the material handle, so that the material handle cannot be separated from the material handle push rod, and the inclined limiting surface is conducive to making it easier to separate when a relative force is generated between the material handle push rod and the material handle along the ejection direction, thereby ensuring the subsequent ejection effect; and by setting the material hook gap to pass through the material handle push rod or the inner wall of the material hook gap along the setting direction of the feed runner and only toward the side where the gate is located along the setting direction of the feed runner, so that when the material handle push rod drives the injection molded material in the material hook gap to completely separate from the movable mold, the injection molded part can be taken out along the setting direction of the feed runner by clamping the ejected injection molded part. In this process, the movement stroke of the material handle body is effectively constrained by the material handle push rod, which effectively reduces the probability of the material handle breaking and flying out due to excessive offset during ejection, thereby ensuring product quality.

[0009] In the aforementioned injection mold, the fixed mold is provided with an injection nozzle whose port communicates with the feed channel. The movable mold has a positioning hole in communication with the feed channel. The ejector pin of the material handle is positioned and inserted into the positioning hole, and the positioning hole is aligned with the position of the injection nozzle along the orientation. This allows the injection nozzle to spray molten material directly between the inner wall of the positioning hole and the hooking notch, ensuring the saturation of the injection material filling the hooking notch and thereby improving the strength of the hooking.

[0010] In the aforementioned injection mold, the axial dimension of the hook notch along the material handle ejector pin is approximately the same as the radial dimension of the material handle ejector pin. This ensures that the injected plastic within the hook notch can generate sufficient tensile strength without taking up too much of the injected plastic. This also prevents the contact area between the injected plastic and the inner wall of the hook notch from being too large, making it difficult to remove the material.

[0011] In the above-mentioned injection mold, the inner wall of the feed runner has a guide surface extending toward the location of the gate and tilted toward the side where the fixed mold is located. The guide surface extends to the inner wall of the gate. The inner wall of the feed runner also has a buffer groove formed by being recessed toward the side where the fixed mold is located. The guide surface is opposite to the buffer groove in the mold closing direction of the movable mold. In this way, the guide surface can guide the molten material in the feed runner to flow to the gate, while the buffer groove increases the channel cross-section at the gate. In this way, most of the molten material flowing along the guide surface will first flow into the buffer groove on the other side, causing the kinetic energy of the molten material to be lost. When it flows into the gate again, the flow rate is greatly reduced, which is beneficial to reducing the spray marks at the gate after the injection molded part is formed, improving product quality, and at the same time helping to ensure the molding strength at the gate and reducing the risk of gate breakage during ejection of the injection molded part.

[0012] In the above injection mold, the inner wall of the buffer groove is processed with an arc transition, and the inner wall of the buffer groove is connected to the inner wall of the gate. This helps to ensure that the molten material flows smoothly into and out of the buffer groove, and avoids buffer failure caused by material stagnation.

[0013] In the aforementioned injection mold, the inner wall of the feed channel has a weakening protrusion that arches toward the side where the fixed mold is located. The weakening protrusion is located along the length of the feed channel between the buffer groove and the positioning hole. This weakening protrusion encroaches on the internal space of the feed channel, forming a weakening groove after the handle is formed. When the ejection timing of the handle is out of sync with that of the injection molded part, the handle can bend and adapt to the weakening groove, distributing the deformation at the gate, preventing the handle from breaking, and ensuring product quality. The weakening protrusion also causes the molten material to flow first toward the side near the fixed mold, then along the guide surface, and finally to the buffer groove. This fully consumes the kinetic energy of the molten material and reduces spray marks on the product surface at the gate.

[0014] In the aforementioned injection mold, the end of the ejector pin facing the fixed mold is located within the positioning hole, and the end surface of this end of the ejector pin is spaced from the port connecting the positioning hole to the feed channel. This provides a transition section, commensurate with the radial dimensions of the positioning hole, between the weaker portion within the hook notch and the main body of the ejector pin. This transition section deforms under load, thereby reducing the risk of fracture of the molded portion within the hook notch when subjected to stress.

[0015] In the above-mentioned injection mold, the movable mold further comprises an axial hole arranged parallel to the positioning hole, and an auxiliary ejector pin is inserted and positioned in the axial hole. The auxiliary ejector pin is located on the side of the material handle ejector pin away from the gate. The auxiliary ejector pin is axially opposite to the position of the feed runner. The end of the auxiliary ejector pin facing the fixed mold is opposite to the material handle ejector pin along the length of the feed runner and is offset from the position of the hook notch. In this way, the auxiliary ejector pin can move synchronously with the material handle ejector pin to eject the material handle, which is conducive to the smooth separation of the material handle from the feed runner. In addition, the size of the molten material formed in the axial hole is longer. In this way, when the auxiliary ejector pin is fully ejected, it can be ensured that the part formed in the hook notch is also completely separated from the positioning hole, which facilitates the determination of the demolding status.

[0016] In the above-mentioned injection mold, a sleeve is detachably connected to the movable mold, and the inner hole of the sleeve forms the positioning hole. The inner diameter of the sleeve at the end away from the fixed mold is larger than the outer diameter of the material handle ejector pin. The outer periphery of the end of the material handle ejector pin facing the fixed mold is transitionally matched with the inner wall of the sleeve. In this way, the powder generated by the material handle after separation is difficult to pour into the inner cavity of the sleeve, ensuring the accuracy of the mold. At the same time, the end of the sleeve away from the fixed mold can reduce the friction area between the material handle ejector pin and the sleeve, ensuring smooth ejection. In addition, the sleeve itself is detachable, and sleeves with different inner diameter specifications can be replaced, thereby adapting to different material handle ejector pins, which is conducive to improving the applicability of the mold.

[0017] In the above-mentioned injection mold, the material handle ejector includes a coaxially arranged movable rod and a sleeve, the material hooking notch is located at one end of the movable rod, the other end of the movable rod is inserted into the sleeve and can reciprocate axially relative to the sleeve, an annular limit stop edge is provided on the inner edge of the end of the sleeve facing the fixed mold, a compression spring sleeved on the outer periphery of the movable rod is provided between the outer periphery of the other end of the movable rod and the limit stop edge, and the outer periphery of the movable rod has an annular step surface that is limited and abutted against the end face of the sleeve. In this way, when the movable rod is pulled by the material handle, it can move toward the side where the fixed mold is located and drive the compression spring to compress, that is, when the ejection action of the material handle ejector does not match the injection mold ejector or the auxiliary ejector, it may cause the material handle to be pulled. At this time, the movable rod can be extended to a certain length to reduce the deformation of the material handle itself, thereby protecting the material handle from breaking and flying out.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] The ejector pin of the material handle of the injection mold can be extended into the feed runner during demolding. The molten material in the feed runner can flow into the movable mold between the hook notch and the outer periphery of the material handle ejector pin through the feed notch during injection molding, and be hardened and formed during the demolding cooling stage. The material handle molded in the feed runner will be integrally formed with the part located in the hook notch, and the injection plastic located in the hook notch will be limited axially by the constraints of the movable mold and the inner wall of the flared hook notch and the material handle ejector pin. That is, the material handle will be pulled by the material handle ejector pin in the initial stage of ejecting the material handle, so that the material handle cannot be separated from the material handle ejector pin. When the material handle ejector pin drives the injection plastic located in the hook notch to completely separate from the movable mold, the injection molded part can be taken out by clamping and ejecting the injection molded part and moving it toward the opening of the hook notch. In this process, the movement stroke of the material handle body is effectively constrained by the material handle ejector pin, which effectively reduces the probability of the material handle breaking and flying out due to excessive offset during ejection, thereby ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the partial cross-sectional structure of embodiment 1.

[0021] Figure 2 yes Figure 1 Enlarged view of part A in .

[0022] Figure 3 yes Figure 1 Enlarged view of part B in .

[0023] Figure 4 It is a schematic diagram of the partial three-dimensional structure of the material handle push rod in Example 1.

[0024] Figure 5 It is a schematic diagram of the partial cross-sectional structure of the second embodiment.

[0025] Figure 6 yes Figure 5 Enlarged view of part C in .

[0026] Figure 7 It is a schematic diagram of the partial three-dimensional structure of the material handle push rod in Example 3.

[0027] In the figure, 1, fixed mold;

[0028] 2. Moving mold; 21. Positioning hole; 22. Axis hole;

[0029] 3. Gate;

[0030] 4. Feed channel; 41. Guide surface; 42. Buffer groove; 43. Weakened protrusion;

[0031] 5. Material handle push rod; 51. Material hook notch; 52. Limiting surface; 53. Movable rod; 531. Annular step surface; 54. Sleeve; 541. Limiting edge; 55. Compression spring;

[0032] 6. Injection nozzle; 7. Auxiliary ejector; 8. Sleeve. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments. Example 1:

[0034] like Figure 1-4As shown, the injection mold includes a fixed mold 1 and a movable mold 2 separated into left and right parts, with a gate 3 and a strip-shaped feed channel 4 between the fixed mold 1 and the movable mold 2. The feed channel 4 is connected to the mold cavity through the gate 3. A material handle push rod 5 that can reciprocate relative to the movable mold 2 is inserted in the movable mold 2. The driving mechanism of the material handle push rod 5 is the existing technology. The material handle push rod 5 is axially opposite to the position of the feed channel 4. The material handle push rod 5 has a hooking notch 51 at the edge of the end face of the fixed mold 1. The inner wall of the hooking notch 51 has a limiting surface 52 inclined toward the side away from the fixed mold 1 along the length direction of the material handle push rod 5. The inner wall of the hooking notch 51 is only toward the side where the gate 3 is located along the setting direction of the feed channel 4; specifically, the hooking notch 51 is a notch that passes through from front to back, and the limiting surface 5 of the hooking notch 51 extends obliquely to the end face of the material handle push rod 5. The fixed mold 1 and the movable mold 2 can be closed to form the product in the cavity therebetween. The driving mechanism of the movable mold 2 can be the existing technology. The molten injection plastic can pass through the feed runner 4 and the gate 3 and then enter the cavity. The size of the gate 3 is smaller than that of the feed runner 4, which is conducive to reducing the difficulty of processing the product surface when processing the gate 3 after the product is formed. The material handle ejector 5 can eject the material handle formed in the feed runner 4 when the mold is opened and demolded; by providing a hooking notch 51 on the outer periphery of one end of the material handle ejector 5 facing the fixed mold 1, and providing a limiting surface 52 in the hooking notch 51, and making the inner wall of the hooking notch 51 only toward the side where the gate 3 is located along the setting direction of the feed runner 4, since the area where the material handle ejector 5 is located is connected to the feed runner 4, the molten material in the feed runner 4 can flow into the hooking notch during injection molding. The plastic material in the hook gap 51 is limited in the axial direction by the material handle push rod 5 under the constraint of the movable mold 2 and the limiting surface 52, that is, the material handle will be pulled by the material handle push rod 5 in the initial stage of ejecting the material handle, so that the material handle cannot be separated from the material handle push rod 5. When the material handle push rod 5 drives the injection plastic material in the hook gap 51 to completely separate from the movable mold 2, the injection molded part can be taken out by clamping and pulling it out along the direction set by the feed runner 4. In this process, the movement stroke of the material handle body is effectively constrained by the material handle push rod 5, which effectively reduces the probability of the material handle breaking and flying out due to excessive offset distance during ejection, thereby ensuring product quality. Specifically, the fixed mold 1 is equipped with an injection nozzle 6, whose port communicates with the feed channel 4. This injection nozzle 6 is an existing component. The movable mold 2 has a positioning hole 21 connected to the feed channel 4. The ejector pin 5 is positioned and inserted into the positioning hole 21. The positioning hole 21 is aligned with the position of the injection nozzle 6 along the installation direction. This allows the injection nozzle 6 to spray molten material directly into the space between the inner wall of the positioning hole 21 and the hooking notch 51, which helps ensure the saturation of the injection material filling the hooking notch 51 and thus improves the strength of the hook.The axial dimension of the material handle ejector pin 5 is slightly larger than the radial dimension of the material handle ejector pin 5. This ensures that the injection molding material within the material handle ejector pin 51 can generate sufficient tensile strength without consuming too much of the injection molding material. It also prevents the excessive contact area between the injection molding material and the inner wall of the material handle ejector pin 51, which could make material removal difficult. The end of the material handle ejector pin 5 facing the fixed mold 1 is located within the positioning hole 21, and the end face of this end of the material handle ejector pin 5 is spaced from the port of the positioning hole 21 that connects to the feed channel 4. This adds a transition section with a radial dimension equivalent to the positioning hole 21 between the weaker portion within the material handle ejector pin 51 and the material handle body. This transition section can participate in deformation when subjected to force, which helps reduce the risk of fracture of the molded portion within the material handle ejector pin 51 when subjected to force.

[0035] like Figure 1 、 Figure 3 As shown, the inner wall of the feed runner 4 has a guide surface 41 extending toward the location of the gate 3 and tilted toward the side where the fixed mold 1 is located. The guide surface 41 extends to the inner wall of the gate 3. The inner wall of the feed runner 4 also has a buffer groove 42 formed by being recessed toward the side where the fixed mold 1 is located. The guide surface 41 is opposite to the buffer groove 42 along the mold closing direction of the movable mold 2. In this way, the guide surface 41 can guide the molten material in the feed runner 4 to flow to the gate 3, while the buffer groove 42 increases the channel cross-section at the gate 3. In this way, most of the molten material flowing along the guide surface 41 will first flow into the buffer groove 42 on the other side, causing the kinetic energy of the molten material to be lost. When it then flows into the gate 3, the flow rate is greatly reduced, which is beneficial to reducing the spray marks at the gate 3 after the injection molding, improving product quality, and at the same time, it is beneficial to ensure the molding strength at the gate 3 and reduce the risk of the gate 3 breaking when the injection molding is ejected. The inner wall of the buffer groove 42 is treated with a circular arc transition, and the inner wall of the buffer groove 42 is joined to the inner wall of the gate 3. This ensures smooth flow of molten material into and out of the buffer groove 42, preventing material stagnation and buffer failure. The inner wall of the feed channel 4 has a weakening protrusion 43 that arches toward the side of the fixed mold 1. The weakening protrusion 43 is located along the length of the feed channel 4 between the buffer groove 42 and the positioning hole 21. This weakening protrusion 43 encroaches on the internal space of the feed channel 4, forming a weakening groove after the mold handle is formed. When the ejection timing of the mold handle is out of sync with the ejection of the injection molded part, the mold handle can bend and adapt to the weakening groove, distributing the deformation at the gate 3 and preventing the mold handle from breaking, which helps ensure product quality. At the same time, the weakening protrusion 43 allows the molten material to flow first toward the side near the fixed mold 1, then along the guide surface 41, and finally to the buffer groove 42. This effectively dissipates the kinetic energy of the molten material and reduces the spray marks on the product surface at the gate 3.

[0036] like Figure 1 、 Figure 2As shown, the movable mold 2 also has an axial hole 22 arranged parallel to the positioning hole 21. An auxiliary ejector pin 7 is positioned and inserted into the axial hole 22. The auxiliary ejector pin 7 is located on the side of the material handle ejector pin 5 away from the gate 3. The auxiliary ejector pin 7 is axially opposite to the position of the feed runner 4. The end of the auxiliary ejector pin 7 facing the fixed mold 1 is opposite to the material handle ejector pin 5 along the length of the feed runner 4 and is offset from the position of the hook notch 51. In this way, the auxiliary ejector pin 7 can move synchronously with the material handle ejector pin 5 to eject the material handle, which is conducive to the smooth separation of the material handle from the feed runner 4. In addition, the size of the molten material formed in the axial hole 22 is longer. In this way, when the auxiliary ejector pin 7 is fully ejected, it can be ensured that the part formed in the hook notch 51 is also completely separated from the positioning hole 21, which facilitates the determination of the demolding status. A sleeve 8 is detachably connected to the movable mold 2. The inner hole of the sleeve 8 forms a positioning hole 21. The inner diameter of the sleeve 8 at the end away from the fixed mold 1 is larger than the outer diameter of the material handle ejector pin 5. The outer periphery of the end of the material handle ejector pin 5 facing the fixed mold 1 is transitionally matched with the inner wall of the sleeve 8. In this way, the powder generated after the material handle is separated is difficult to pour into the inner cavity of the sleeve 8, ensuring the accuracy of the mold. At the same time, the end of the sleeve 8 away from the fixed mold 1 can reduce the friction area between the material handle ejector pin 5 and the sleeve 8, ensuring smooth ejection. In addition, the sleeve 8 itself is detachable, and sleeves 8 with different inner diameter specifications can be replaced, thereby adapting to different material handle ejector pins 5, which is conducive to improving the applicability of the mold. Example 2:

[0037] like Figure 4 、 Figure 5 、 Figure 6 As shown, this embodiment is basically the same as the first embodiment, except that: the material handle push rod 5 includes a coaxially arranged movable rod 53 and a sleeve 54, the hooking notch 51 is located at one end of the movable rod 53, and the other end of the movable rod 53 is inserted in the sleeve 54 and can reciprocate axially relative to the sleeve 54, and the inner edge of the end of the sleeve 54 facing the fixed mold 1 is provided with an annular limit stop 541, and the limit stop 541 is a retaining spring embedded in the sleeve 54, and a compression spring 55 sleeved on the outer periphery of the movable rod 53 is provided between the outer periphery of the other end of the movable rod 53 and the limit stop 541, and the outer periphery of the movable rod 53 has an annular step surface 531 that is limited and abutted against the end face of the sleeve 54. In this way, the movable rod 53 can move toward the side where the fixed mold 1 is located when it is pulled by the material handle and drive the compression spring 55 to be compressed. That is, when the ejection action of the material handle ejector rod 5 does not match the injection molded part ejector rod or the auxiliary ejector rod 7, it may cause the material handle to be pulled. At this time, the movable rod 53 can be extended to a certain length to reduce the deformation of the material handle itself, thereby protecting the material handle from breaking and flying out. Example 3:

[0038] like Figure 7 As shown, this embodiment is basically the same as the first embodiment, except that the hooking notch 51 passes through both sides of the material handle push rod 5 along the setting direction of the feed flow channel 4.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An injection mold, comprising a fixed mold (1) and a movable mold (2), wherein a gate (3) and a strip-shaped feed channel (4) are provided between the fixed mold (1) and the movable mold (2), and a material handle ejector rod (5) that can reciprocate relative to the movable mold (2) is inserted into the movable mold (2), and the material handle ejector rod (5) is axially opposite to the position of the feed channel (4), characterized in that: A hooking notch (51) is provided at the edge of the end face of the material handle push rod (5) facing the fixed mold (1). The inner wall of the hooking notch (51) has a limiting surface (52). The limiting surface (52) is inclined toward the side away from the fixed mold (1) along the length direction of the material handle push rod (5). The hooking notch (51) passes through the material handle push rod (5) or the inner wall of the hooking notch (51) along the setting direction of the feed flow channel (4). ) is set in a direction only toward the side where the gate (3) is located; the fixed mold (1) is provided with an injection nozzle (6) whose port is connected to the feed flow channel (4); the movable mold (2) has a positioning hole (21) connected to the feed flow channel (4); the material handle push rod (5) is positioned and inserted in the positioning hole (21); the positioning hole (21) is opposite to the position of the injection nozzle (6) along the setting direction, and the inner wall of the feed flow channel (4) has A guide surface (41) extends toward the position of the gate (3) and is inclined toward the side where the fixed mold (1) is located, the guide surface (41) extends to the inner wall of the gate (3), the inner wall of the feed channel (4) also has a buffer groove (42) formed by being recessed toward the side where the fixed mold (1) is located, the guide surface (41) is opposite to the position of the buffer groove (42) along the mold closing direction of the movable mold (2), the inner wall of the feed channel (4) has a weakened protrusion (43) formed by arching toward the side where the fixed mold (1) is located, the weakened protrusion (43) is located between the position of the buffer groove (42) and the position of the positioning hole (21) along the length direction of the feed channel (4), one end of the material handle push rod (5) facing the fixed mold (1) is located in the positioning hole (21), and the end face of the material handle push rod (5) is spaced from the port of the positioning hole (21) connected to the feed channel (4).

2. The injection mold according to claim 1, characterized in that The dimension of the hooking notch (51) along the axial direction of the material handle push rod (5) is close to the radial dimension of the material handle push rod (5).

3. The injection mold according to claim 1, characterized in that The inner wall of the buffer groove (42) is processed with an arc transition, and the inner wall of the buffer groove (42) is connected to the inner wall of the gate (3).

4. The injection mold according to claim 1, characterized in that The movable mold (2) further comprises an axial hole (22) arranged in parallel with the positioning hole (21), an auxiliary ejector rod (7) is positioned and inserted in the axial hole (22), the auxiliary ejector rod (7) is located on the side of the material handle ejector rod (5) away from the gate (3), the auxiliary ejector rod (7) is axially opposite to the position of the feed channel (4), and one end of the auxiliary ejector rod (7) facing the fixed mold (1) is opposite to the material handle ejector rod (5) along the length direction of the feed channel (4) and is offset from the position where the hooking notch (51) is located.

5. The injection mold according to claim 1, wherein: A sleeve (8) is detachably connected to the movable mold (2), and the inner hole of the sleeve (8) forms the positioning hole (21). The inner diameter of the sleeve (8) at one end away from the fixed mold (1) is larger than the outer diameter of the material handle push rod (5). The outer periphery of one end of the material handle push rod (5) toward the fixed mold (1) transitionally fits with the inner wall of the sleeve (8).

6. The injection mold according to claim 1, characterized in that The material handle push rod (5) includes a coaxially arranged movable rod (53) and a sleeve (54), the material hooking notch (51) is located at one end of the movable rod (53), the other end of the movable rod (53) is inserted into the sleeve (54) and can reciprocate axially relative to the sleeve (54), the inner edge of one end of the sleeve (54) facing the fixed mold (1) is provided with an annular limit stop edge (541), the outer periphery of the other end of the movable rod (53) and the limit stop edge (541) are provided with a compression spring (55) sleeved on the outer periphery of the movable rod (53), and the outer periphery of the movable rod (53) has an annular step surface (531) that is limited and abutted against the end face of the sleeve (54).

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