Molds and injection molding equipment

Abstract

This invention relates to the field of mold demolding technology, and particularly to a mold and injection molding equipment. The mold includes a moving mold and a fixed mold. The moving mold has a moving core. The fixed mold includes a fixed core, a first ejector assembly, a second ejector assembly, a third ejector assembly, and a fixed plate. The fixed core and the moving core enclose a cavity, and the fixed core has a runner communicating with the cavity. Ejector rollers drive the first ejector plate, the second ejector plate, and the third ejector plate to move. When the first ejector plate moves a first ejection stroke relative to the cavity, the runner is disconnected from the product. When the first ejector plate, the second ejector plate, and the third ejector plate move synchronously a second ejection stroke relative to the cavity, the product is removed from the cavity. When the first ejector plate and the third ejector plate move a third ejection stroke relative to the cavity, the product is removed from the second ejector pin. The main objective of this invention is to provide a mold that avoids gate damage during demolding and reduces demolding difficulty.

Description

Technical Field

[0001] This invention relates to the field of mold release technology, and in particular to a mold and injection molding equipment. Background Technology

[0002] Injection molding is one of the most widely used molding technologies in the plastics processing industry. Its basic process is as follows: granular or powdered plastic raw materials are added to the barrel of an injection molding machine. The barrel's heating device melts and plasticizes the raw materials, forming a fluid injection medium. Then, the screw or plunger of the injection molding machine pushes the injection medium into a pre-closed mold cavity under high pressure. After the injection medium fully fills the cavity and cools and solidifies, the mold opening and closing mechanism drives the mold to separate, finally removing the molded workpiece from the mold. This technology is suitable for mass production of various complex-shaped plastic parts.

[0003] In related technologies, molds are usually equipped with flow channels that communicate with the cavity to guide the injection medium smoothly into the cavity. However, during the cooling stage after injection molding, the injection medium remaining in the flow channels will cool and solidify along with the injection medium in the cavity. This solidified flow medium will form a tight and fixed connection with the molded workpiece in the cavity. On the other hand, due to the different functional and appearance requirements of different application scenarios, the shape design of the workpiece is often complex and diverse. The special structure of some workpieces (such as protrusions, grooves, thin walls, etc.) will cause the channels in the mold cavity that are adapted to them to exert a large clamping force on the local structure of the workpiece, making it difficult to separate easily.

[0004] Based on the above two factors, when conventional injection molding equipment performs demolding operations, whether through mechanical or pneumatic ejection, the pulling effect of the runner medium and the clamping effect of the cavity channel can easily damage the structural stability of the workpiece, leading to deformation phenomena such as warping, cracking, and denting. At the same time, the instantaneous separation of the runner medium from the workpiece connection during demolding will also generate impact force, making the demolded workpiece prone to gate damage problems such as missing material, scratches, and breakage at the gate position (the connection between the runner and the cavity), which seriously affects the product quality and pass rate of the workpiece. Summary of the Invention

[0005] The main objective of this invention is to provide a mold that avoids gate damage during demolding and reduces demolding difficulty.

[0006] To achieve the above objectives, the mold is applied to an injection molding machine for injection molding products, the injection molding machine having an ejector roller, and the mold comprising:

[0007] The moving mold is provided with a moving mold core;

[0008] A fixed mold, comprising a fixed mold core, a first ejection assembly, a second ejection assembly, a third ejection assembly, and a fixed plate, wherein the fixed mold core and the moving mold core enclose a cavity, and the fixed mold core has a flow channel communicating with the cavity;

[0009] The first ejection assembly has a first ejection plate and a first ejector pin that are movable relative to the fixed mold core. The first ejection plate is located on the side of the fixed mold core facing away from the moving mold core, and the first ejector pin is disposed on the first ejection plate and aligned with the flow channel.

[0010] The second ejection assembly has a second ejection plate and a second ejector pin that are movable relative to the fixed mold core. The second ejection plate is located on the side of the first ejection plate facing away from the moving mold core, and the second ejector pin is disposed on the second ejection plate and aligned with a first part of the article.

[0011] The third ejection assembly has a third ejection plate and a third ejector pin that are movable relative to the fixed mold core. The third ejection plate is located between the first ejection plate and the second ejection plate, and the third ejector pin is disposed on the third ejection plate and aligned with the second part of the article.

[0012] The top roller is used to drive the first ejector plate, the second ejector plate, and the third ejector plate to move. When the first ejector plate moves a first ejection stroke relative to the cavity, the flow channel is disconnected from the product. When the first ejector plate, the second ejector plate, and the third ejector plate move synchronously a second ejection stroke relative to the cavity, the product is removed from the cavity. When the first ejector plate and the third ejector plate move a third ejection stroke relative to the cavity, the product is removed from the second ejector pin.

[0013] In one embodiment of the present invention, the mold is further provided with a connecting assembly, the connecting assembly including a limiting member and a mating member that can be connected and disconnected from each other, the limiting member being movably disposed on the third ejector plate, one end of the mating member being limitedly connected to the second ejector plate, and the other end of the mating member abutting against the side of the limiting member facing away from the second ejector plate;

[0014] When the first ejector plate, the second ejector plate, and the third ejector plate move synchronously with respect to the cavity during the second ejection stroke, the limiting member can move away from the mating member to disengage from it.

[0015] In one embodiment of the present invention, the connecting assembly further includes a fixing member, one end of which is fixedly connected to the moving mold core, and the other end of which is inserted into the third ejector plate and abuts against the limiting member;

[0016] When the first ejector plate, the second ejector plate, and the third ejector plate move synchronously with respect to the cavity during the second ejection stroke, the fixing member drives the mating member to move away from the limiting member.

[0017] In one embodiment of the present invention, the limiting member is provided with a movable hole, and the end of the fixing member abuts against the inner peripheral wall of the movable hole;

[0018] The inner peripheral wall of the movable hole has a first extrusion section, and the end of the fixing member has a second extrusion section adapted to the first extrusion section, the second extrusion section abutting against the first extrusion section.

[0019] In one embodiment of the present invention, the connecting assembly further includes a reset member, the reset member being connected to the third ejector plate and the limiting member; the reset member is configured to drive the limiting member to move toward the fixing member.

[0020] In one embodiment of the present invention, the third ejector plate is provided with a limiting groove and a limiting channel, the limiting groove being connected to the limiting channel;

[0021] One end of the fixing member, the limiting member, and the resetting member are disposed in the limiting groove, and a portion of the structure of the mating member is limited within the limiting channel.

[0022] In one embodiment of the present invention, the first ejector plate is provided with a top post on the side facing away from the moving mold core, the top post passes through the third ejector plate, the second ejector plate has a lifting channel, and the top post has a first stroke section exposed in the lifting channel;

[0023] The lifting channel is configured for the insertion of a top roller, which is capable of abutting against the first stroke section.

[0024] In one embodiment of the present invention, the second ejector pin includes a receiving platform and a covering section, the covering section being disposed on the surface of the receiving platform and extending toward the cavity;

[0025] The receiving platform is used to abut the end of the second part of the product, and the covering section is used to cover the outer peripheral surface of the second part of the product.

[0026] In one embodiment of the present invention, the mold is further provided with a fixed base plate and a guide rod. The fixed base plate is located on the side of the second ejector plate facing away from the third ejector plate. The guide rod is fixedly located on the fixed base plate and passes through the second ejector plate, the third ejector plate, and the first ejector plate in sequence.

[0027] The present invention also proposes an injection molding device, the injection molding device comprising an injection molding machine and a mold as described in any one of the above, the injection molding machine being provided with a movable top roller, the top roller being used to drive the first ejector plate, the second ejector plate and the third ejector plate to move.

[0028] In this technical solution, the first ejector plate moves independently during its first ejection stroke, causing the first ejector pin of the alignment runner to prematurely disconnect the runner from the product. This avoids the pulling effect when the runner medium and product simultaneously separate during conventional demolding, and eliminates the impact force of the instantaneous separation of the runner and product, thus fundamentally solving the gate bounce problem. Subsequently, the first, second, and third ejector plates move synchronously during their second ejection stroke, allowing the second and third ejector pins to act on different parts of the product, distributing the ejection force to multiple areas. This avoids localized force concentration caused by single ejection and effectively counteracts the clamping force generated by the cavity's special structures such as protrusions, grooves, and thin walls, preventing... To prevent workpiece warping, cracking, denting, and other deformations, the first and third ejector plates move during the third ejection stroke to detach the product from the second ejector pin, ensuring that the entire demolding process is controllable and further avoiding subsequent interference and deformation. Through staged ejection, the orderly separation of the runner disconnection and product demolding is achieved. By dispersing the ejection force through the coordinated action of multiple ejector pins, the problems of runner pulling and gate spring damage are completely solved, and the demolding difficulties caused by cavity clamping force are alleviated. This significantly improves the structural stability and appearance quality of the product, increases the product qualification rate, and adapts to the demolding requirements of complex-shaped products. It also reduces the demolding operation difficulty of injection molding equipment and enhances the practicality and adaptability of the mold. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the structure of an embodiment of the mold provided by the present invention;

[0031] Figure 2 A schematic diagram of the internal structure of an embodiment of the mold provided by the present invention;

[0032] Figure 3 This is a diagram showing the fit between the ejector pin and the product provided by the present invention.

[0033] Explanation of icon numbers:

[0034] 100. Top roller;

[0035] 200. Product; 201. First part; 202. Second part;

[0036] 10. Moving mold; 11. Moving mold core;

[0037] 20. Mold fixing;

[0038] 21. First ejector assembly; 211. First ejector plate; 212. First ejector pin; 213. Ejector post;

[0039] 22. Second ejector assembly; 221. Second ejector plate; 221a. Lifting channel; 222. Second ejector pin; 2221. Receiving platform; 2222. Covering section;

[0040] 23. Third ejector assembly; 231. Third ejector plate; 231a. Limiting groove; 231b. Limiting channel; 232. Third ejector pin;

[0041] 24. Mold core; 24a. Runner;

[0042] 25. Connecting component; 251. Limiting component; 252. Mating component; 253. Fixing component; 254. Resetting component;

[0043] 26. Fix the base plate;

[0044] 27. Guide rod.

[0045] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0048] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0049] The applicant discovered that during injection molding, when the surface of the part contains small, delicate protrusions, if the ejector pins are only positioned in the non-protruding areas, uneven force distribution during demolding may lead to quality problems. Because the cavity exerts a strong clamping force on the protruding areas, during the ejection stage, the main body of the part is pushed out of the mold by the ejection system, while the protruding areas remain strongly constrained by the cavity. This unbalanced demolding force can easily cause the protruding areas to experience excessive tensile or shear stress during dynamic demolding, leading to defects such as plastic deformation, microcracks, or even fracture in these areas, severely affecting the molding quality and structural integrity of the part.

[0050] The main objective of this invention is to provide a mold that avoids gate damage during demolding of the product 200, thereby reducing the difficulty of demolding.

[0051] To achieve the above objectives, the mold is applied to an injection molding machine, which is used to injection mold product 200. The injection molding machine has an ejector roller 100. Please refer to [link / reference]. Figure 1 The mold includes:

[0052] Moving mold 10, the moving mold 10 is provided with moving mold core 11;

[0053] The fixed mold 20 includes a fixed mold core 24, a first ejection assembly 21, a second ejection assembly 22, a third ejection assembly 23, and a fixed plate. The fixed mold core 24 and the moving mold core 11 enclose each other to form a cavity. The fixed mold core 24 has a flow channel 24a that communicates with the cavity.

[0054] The first ejection assembly 21 has a first ejection plate 211 and a first ejector pin 212 that are movable relative to the fixed mold core 24. The first ejection plate 211 is located on the side of the fixed mold core 24 facing away from the moving mold core 11. The first ejector pin 212 is disposed on the first ejection plate 211 and aligned with the runner 24a.

[0055] The second ejection assembly 22 has a second ejection plate 221 and a second ejector pin 222 that are movable relative to the fixed mold core 24. The second ejection plate 221 is located on the side of the first ejection plate 211 facing away from the moving mold core 11. The second ejector pin 222 is disposed on the second ejection plate 221 and is aligned with the first part 201 of the article 200.

[0056] The third ejection assembly 23 has a third ejection plate 231 and a third ejector pin 232 that are movable relative to the fixed mold core 24. The third ejection plate 231 is located between the first ejection plate 211 and the second ejection plate 221. The third ejector pin 232 is disposed on the third ejection plate 231 and is aligned with the second part 202 of the product 200.

[0057] The top roller 100 is used to drive the first ejector plate 211, the second ejector plate 221 and the third ejector plate 231 to move. When the first ejector plate 211 moves the first ejection stroke relative to the cavity, the flow channel 24a is disconnected from the product 200. When the first ejector plate 211, the second ejector plate 221 and the third ejector plate 231 move the second ejection stroke relative to the cavity, the product 200 is removed from the cavity. When the first ejector plate 211 and the third ejector plate 231 move the third ejection stroke relative to the cavity, the product 200 is removed from the second ejector pin 222.

[0058] The moving mold 10 is one of the core components of the mold that works with the fixed mold 20 to achieve injection molding and demolding. The opening and closing of the mold is achieved by controlling the movement of the moving mold 10. The moving mold core 11, as the core functional structure of the moving mold 10, precisely aligns with the fixed mold core 24 of the fixed mold 20 when the mold is closed, forming a cavity to accommodate the injection medium. After the injection medium cools and solidifies in the cavity, the product 200 is formed. At the same time, the moving mold 10 can move relative to the fixed mold 20 under the drive of the mold opening and closing mechanism of the injection molding equipment, realizing the opening and closing action of the mold. When the mold is closed, it ensures the cavity is sealed to complete the injection molding. When the mold is opened, it provides the necessary space for the subsequent ejection components to push the product 200 out of the mold. It is a basic component to ensure the smooth progress of the injection molding process.

[0059] The fixed mold 20 is the core fixed component in the mold that carries the cavity forming, the flow channel 24a guiding and multiple sets of ejection components. It includes the fixed mold core 24, the first ejection component 21, the second ejection component 22 and the third ejection component 23. The fixed mold core 24 and the moving mold core 11 cooperate to form a cavity, and the fixed mold core 24 has a flow channel 24a communicating with the cavity. The flow channel 24a is used to guide the molten injection medium to flow steadily into the cavity during the injection molding process. The first ejection assembly 21 includes a first ejection plate 211 and a first ejector pin 212 that can move relative to the fixed mold core 24. The first ejection plate 211 is located on the side of the fixed mold core 24 away from the moving mold core 11. The first ejector pin 212 is disposed on the first ejection plate 211 and aligned with the flow channel 24a. The core function of the first ejector pin 212 is to push the solidified medium in the flow channel 24a to separate from the product 200. The second ejection assembly 22 includes a second ejection plate 221 and a second ejector pin 222 that can move relative to the fixed mold core 24. The second ejection plate 221 is located on the side of the first ejection plate 211 away from the moving mold core 11. The second ejector pin 222 is disposed on the second ejection plate 221 and aligned with the first part of the product 200. Position 201 is used to apply ejection force from a specific part of the product 200. The first part 201 of the product 200 refers to a small, delicate protrusion feature in the product 200. The third ejection assembly 23 includes a third ejection plate 231 and a third ejector pin 232 that are movable relative to the fixed mold core 24. The third ejection plate 231 is located between the first ejection plate 211 and the second ejection plate 221. The third ejector pin 232 is located on the third ejection plate 231 and aligned with the second part 202 of the product 200, and works with the second ejection assembly 22 to disperse the ejection force. The second part 202 of the product 200 refers to a non-protruding part of the product 200, such as the end face, side face, etc. of the product 200. It is understood that the distance between the first ejection plate 211 and the fixed mold core 24 is at least greater than the sum of the distance of the first ejection stroke, the second ejection stroke and the third ejection stroke, so as to facilitate the implementation of three demolding actions.

[0060] The moving mold core 11, fixed mold core 24, first ejector plate 211, third ejector plate 231, and second ejector plate 221 are arranged sequentially from the cavity closest to the product 200 to the direction away from the cavity. The components are arranged linearly and orderly. The moving mold core 11, as a dynamic component directly involved in cavity formation, is at the forefront, while the adjacent fixed mold core 24 serves as a fixed component of the cavity. Together, they enclose the space (cavity) for the injection medium to fill and solidify. The flow channel 24a on the fixed mold core 24 can directly connect to the cavity, ensuring accurate delivery of the injection medium. The first ejector plate 211 is located immediately behind the fixed mold core 24. This arrangement allows the first ejector pin 212 on the first ejector plate 211 to align with the flow channel 24a of the fixed mold core 24 with the shortest possible stroke. This provides a structural basis for the subsequent rapid disconnection of the medium from the product 200 via the flow channel 24a, avoiding action delays or force transmission losses due to excessive stroke. The first ejector plate 211 is located behind... The third ejector plate 231 is located in the middle transition position. It will not interfere with the independent movement of the first ejector plate 211 (to complete the separation of the flow channel 24a), and it can form a stable linkage relationship with the first ejector plate 211 and the second ejector plate 221 during the synchronous ejection stage. This ensures that the third ejector pin 232 (aligning the second part 202 of the product 200) and the second ejector pin 222 (aligning the first part 201 of the product 200) cooperate precisely to achieve uniform distribution of ejection force. The outermost part is the second ejector plate 221, which is located at the end of the entire ejection assembly. It can serve as the basic support component of the ejection system. At the same time, it avoids interference with the individual movements of the first and third ejector plates 231 due to its forward position. This ensures that each ejection assembly can independently complete specific actions during the phased demolding process, and can also work together in the synchronous stage. The overall layout is compact and logically clear, providing spatial structural guarantee for the smooth execution of the phased demolding process.

[0061] The mold proposed in this invention has at least the following three actions during demolding: The first step after mold opening is the disconnection of the runner 24a from the product 200. The ejector roller 100 of the injection molding equipment only drives the first ejector plate 211 to move relative to the cavity for a first ejection stroke. At this time, the first ejector pin 212 connected to the first ejector plate 211 moves with it. Because the first ejector pin 212 is aligned with the runner 24a, it will push the solidified medium in the runner 24a, so that the runner 24a and the product 200 are separated at the gate position, avoiding the medium in the runner 24a pulling the product 200 during subsequent demolding; The second step is the product 200 leaving the cavity. The ejector roller 100 drives the first ejector plate 211, the second ejector plate 221 and the third ejector plate 231 to move synchronously relative to the cavity for a second ejection stroke. At this time, the first ejector pin 212 (which has completed the runner 24a) moves relative to the cavity for a second ejection stroke. The first ejector pin 222 (aligning with the first part 201 of the product 200) and the third ejector pin 232 (aligning with the second part 202 of the product 200) work together to distribute the ejection force to different parts of the product 200, effectively counteracting the clamping force generated by the special structure of the product 200 in the cavity, and pushing the product 200 completely out of the cavity; the third step is the step of the product 200 separating from the second ejector pin 222. The ejector roller 100 drives the first ejector plate 211 and the third ejector plate 231 to move relative to the cavity for a third ejection stroke. The first ejector pin 212 and the third ejector pin 232, which move with the first and third ejector plates 231, will drive the product 200 to continue to move, so that the product 200 separates from the stationary second ejector pin 222, completing the entire demolding process and avoiding interference between the product 200 and the second ejector pin 222 during subsequent part removal.

[0062] In this technical solution, the first ejector plate 211 moves independently during its first ejection stroke, causing the first ejector pin 212 of the alignment runner 24a to prematurely disconnect the runner 24a from the product 200. This avoids the pulling effect when the runner 24a media and the product 200 simultaneously separate during conventional demolding, and also eliminates the impact force of the instantaneous separation of the runner 24a and the product 200, thus solving the gate bounce problem at its root. Subsequently, the first, second, and third ejector plates 231 move synchronously during their second ejection strokes, allowing the second ejector pin 222 and the third ejector pin 232 to act together on different parts of the product 200, distributing the ejection force to multiple areas. This avoids localized force concentration caused by single ejection and effectively counteracts the effects of special structures such as protrusions, grooves, and thin walls in the cavity. The generated clamping force prevents the workpiece from warping, cracking, denting, and other deformations. Finally, the first and third ejector plates 231 move during the third ejection stroke to disengage the product 200 from the second ejector pin 222, ensuring that the demolding process is controllable throughout and further avoiding subsequent interference deformation. The staged ejection achieves the orderly separation of the runner 24a from the demolding of the product 200. The coordinated dispersion of ejection force by multiple ejector pins not only completely solves the problems of runner 24a pulling and gate spring damage, but also alleviates the demolding difficulties caused by the clamping force of the cavity. This significantly improves the structural stability and appearance quality of the product 200, increases the product qualification rate, and adapts to the demolding requirements of complex-shaped products 200, reduces the demolding operation difficulty of injection molding equipment, and enhances the practicality and adaptability of the mold.

[0063] In this technical solution, the first ejector plate 211 moves independently during its first ejection stroke, causing the first ejector pin 212 of the alignment runner 24a to prematurely disconnect the runner 24a from the product 200. This avoids the pulling effect when the runner 24a media and the product 200 simultaneously separate during conventional demolding, and also eliminates the impact force of the instantaneous separation of the runner 24a and the product 200, thus solving the gate bounce problem at its root. Subsequently, the first, second, and third ejector plates 231 move synchronously during their second ejection strokes, allowing the second ejector pin 222 and the third ejector pin 232 to act together on different parts of the product 200, distributing the ejection force to multiple areas. This avoids localized force concentration caused by single ejection and effectively counteracts the effects of special structures such as protrusions, grooves, and thin walls in the cavity. The generated clamping force prevents the workpiece from warping, cracking, denting, and other deformations. Finally, the first and third ejector plates 231 move during the third ejection stroke to disengage the product 200 from the second ejector pin 222, ensuring that the demolding process is controllable throughout and further avoiding subsequent interference deformation. The staged ejection achieves the orderly separation of the runner 24a from the demolding of the product 200. The coordinated dispersion of ejection force by multiple ejector pins not only completely solves the problems of runner 24a pulling and gate spring damage, but also alleviates the demolding difficulties caused by the clamping force of the cavity. This significantly improves the structural stability and appearance quality of the product 200, increases the product qualification rate, and adapts to the demolding requirements of complex-shaped products 200, reduces the demolding operation difficulty of injection molding equipment, and enhances the practicality and adaptability of the mold.

[0064] In one embodiment of the present invention, please refer to Figure 2 , Figure 2 The diagram shows the structure after the mold is opened. The mold is also provided with a connecting component 25. The connecting component 25 includes a limiting member 251 and a mating member 252 that can be connected and disconnected from each other. The limiting member 251 is movably disposed on the third ejector plate 231. One end of the mating member 252 is limitedly connected to the second ejector plate 221, and the other end of the mating member 252 abuts against the side of the limiting member 251 facing away from the second ejector plate 221.

[0065] When the first ejector plate 211, the second ejector plate 221 and the third ejector plate 231 move synchronously with the cavity during the second ejection stroke, the limiting member 251 can move away from the mating member 252 so as to disengage from the mating member 252.

[0066] In this embodiment, the connecting component 25 is designed to precisely control the relative movement of the third ejector plate 231 and the second ejector plate 221 at different demolding stages by utilizing the connectable / disconnectable characteristics of the limiting member 251 and the mating member 252, thereby further ensuring the stability and orderliness of the staged demolding process. Specifically, the limiting member 251 is movably disposed on the third ejector plate 231, one end of the mating member 252 is limitedly connected to the second ejector plate 221, and the other end of the mating member 252 abuts against the limiting member 251 facing away from it. On one side of the second ejector plate 221, during the first ejection phase of demolding, when the first ejector plate 211 moves independently during its first ejection stroke, the limiting member 251 and the mating member 252 form a stable abutment limiting relationship. This relationship prevents the third ejector plate 231 and the second ejector plate 221 from misaligning due to external forces or their own weight, ensuring that they maintain a preset relative position during the subsequent synchronous ejection phase. When demolding enters the second ejection phase, that is, when the first, second, and third ejector plates 231 move synchronously to push the product... When the product 200 is ejected from the cavity, as each ejector plate moves synchronously away from the cavity, the limiting member 251 gradually moves away from the mating member 252 along with the movement of the second ejector plate 221 and eventually detaches. This detachment design ensures that during the synchronous ejection stage, the second ejector plate 221 and the third ejector plate 231 can work together to exert force, and the ejection force is evenly transmitted to the first part 201 and the second part 202 of the product 200 through the second ejector pin 222 and the third ejector pin 232, effectively counteracting the cavity clamping force to prevent the product from being clamped. The deformation of ejector pin 200 clears the structural obstacles for the subsequent third ejection stage (the first and third ejector plates 231 move during the third ejection stroke, while the second ejector plate 221 remains stationary). This prevents the mating part 252 from continuously limiting the movement of the third ejector plate 231, thus ensuring that the product 200 can smoothly detach from the second ejector pin 222. Ultimately, through precise control of the movement relationship of the ejector plates, the demolding difficulty is further reduced, and the risk of deformation and gate damage to the product 200 during demolding is reduced.

[0067] The mating part 252 has a barb structure at the end that abuts against the limiting part 251. The side of the barb structure facing the limiting part 251 has an abutting plane that abuts against the limiting part 251. At the same time, the abutting plane abuts against the side of the limiting part 251 that is away from the second ejector plate 221. The limiting part 251 is above the second ejector plate 221. Thus, under the action of gravity, the mating part 252 and the limiting part 251 engage in a limiting engagement, that is, the second ejector plate 221 and the third ejector plate 231 are connected to the limiting part 251 through the mating part 252. When the mating part 252 and the limiting part 251 separate, the second ejector plate 221 and the third ejector plate 231 will also separate, that is, from the second step after mold opening to the third step.

[0068] "The limiting member 251 can move away from the mating member 252" means that the limiting member 251 can undergo a movement not limited to translation or rotation to gradually move away from the mating member 252. In one embodiment, the limiting member 251 can translate to gradually move away from the mating member 252. Specifically, the second ejector plate 221 is provided with a servo cylinder, and the piston rod of the servo cylinder is connected to the limiting member 251. At the same time, the stroke of the piston rod matches the second ejection stroke. That is, when the first to third ejector plates 231 start moving together and reach the second ejection stroke, the piston rod of the servo cylinder correspondingly completes the retraction action to disengage the limiting member 251 from the mating member 252. In another embodiment, the limiting member 251 can rotate to gradually move away from the mating member 252. Specifically, the limiting member 251 is rotatably mounted on the third ejector plate 231 via a pivot and can swing between the "limited position" and the "disengaged position". A rotary motor is installed on the second ejector plate 221. The output shaft of the rotary motor is connected to the limiting member 251 via a linkage mechanism or directly. When it is necessary for the limiting member 251 to disengage from the mating member 252, the rotary motor receives a control signal and drives the limiting member 251 to rotate around its axis, causing the portion with the abutment plane to deviate from its original alignment with the barb structure of the mating member 252, thereby achieving disengagement. The angular displacement and timing of this rotation are also precisely matched with the second ejection stroke, ensuring that the limiting member 251 can accurately and timely rotate to the disengagement position at the end of the synchronous ejection stage, creating conditions for the subsequent step-by-step movement of the ejector plate.

[0069] In one embodiment of the present invention, please refer to Figure 2 The connecting component 25 also includes a fixing member 253. One end of the fixing member 253 is fixedly connected to the moving mold core 11, and the other end of the fixing member 253 is inserted into the third ejector plate 231 and abuts against the limiting member 251. When the first ejector plate 211, the second ejector plate 221 and the third ejector plate 231 move synchronously relative to the cavity during the second ejection stroke, the fixing member 253 drives the mating member 252 to move away from the limiting member 251.

[0070] In this embodiment, the third ejector plate 231 has a receiving space for the fixing member 253 to move up and down. One end of the fixing member 253 is fixedly connected to the moving mold core 11, and the other end of the fixing member 253 is inserted into the receiving space, such as... Figure 2 As shown, when the mold opens, the moving mold core 11 can drive the fixed part 253 to move upward a certain distance. At this time, the end of the fixed part 253 away from the moving mold core 11 can smoothly exit the receiving space and abut against the limiting part 251. After the mold opens, the moving mold core 11 remains stationary relative to the fixed mold 20. At this time, the fixed part 253, which is fixedly connected to the moving mold core 11, will also be in a stationary state. When the first ejector plate 211, the second ejector plate 221, and the third ejector plate 231 move synchronously relative to the cavity during the second ejection stroke, the third ejector plate 231 moves relative to the fixed part 253. The limiting part 251 located on the third ejector plate 231 can move relative to the fixed part 253. Thus, the limiting part 251... The relative movement of the fixed part 253 provides the conditions for the fixed part 253 to drive the mating part 252 away from the limiting part 251. Specifically, the surface of the fixed part 253 in contact with the limiting part 251 is a convex arc surface. When the limiting part 251 moves relative to the fixed part 253, the convex arc surface of the fixed part 253 can apply a force to the limiting part 251. Under this force, the fixed part 253 forces the limiting part 251 away from the mating part 252. After the third ejector plate 231 moves through the second ejection stroke, the limiting part 251 disengages from the mating part 252. The entire process achieves the disengagement action through the precise cooperation of the mechanical structure, without the need for an additional power source, thus improving the stability and reliability of the demolding process.

[0071] In one embodiment of the present invention, please refer to Figure 2 The limiting member 251 is provided with a movable hole, and the end of the fixing member 253 abuts against the inner peripheral wall of the movable hole; wherein, the inner peripheral wall of the movable hole has a first extrusion section, and the end of the fixing member 253 has a second extrusion section adapted to the first extrusion section, and the second extrusion section abuts against the first extrusion section.

[0072] In this embodiment, both the first extrusion section and the second extrusion section are inclined straight surfaces. That is, along the direction from the third ejector plate 231 to the moving mold core 11, the cross-sectional dimension of the end of the fixing member 253 away from the moving mold core 11 gradually increases, and the diameter of the movable hole gradually increases. In this way, the second extrusion section located at the end of the fixing member 253 can completely fit with the first extrusion section of the movable hole, forming a large-area, gapless contact fit, avoiding local force concentration caused by point contact or line contact, and laying the foundation for the uniform transmission of subsequent forces; further... Step by step, considering the motion relationships in the demolding process—when entering the second ejection stroke, the first ejector plate 211, the second ejector plate 221, and the third ejector plate 231 move synchronously towards the cavity, while the fixed member 253 remains stationary due to its fixed connection with the moving mold core 11. At this time, the third ejector plate 231 will drive the limiting member 251 to make a linear motion relative to the fixed member 253, approaching the moving mold core 11. Since the first extrusion section and the second extrusion section are inclined and fitted together, the stationary second extrusion section will exert a force on the moving first extrusion section. A compressive force is generated along the normal direction of the inclined surface; this compressive force can be decomposed into two components: one along the ejection direction (consistent with the movement direction of the third ejection plate 231, without interfering with the ejection action), and the other perpendicular to the ejection direction (i.e., pointing away from the mating part 252). This perpendicular component becomes the driving force for the limiting member 251, pushing the limiting member 251 smoothly away from the mating part 252 along the preset movement path of the third ejection plate 231; and because the angle of the inclined surface is fixed, the moving speed of the limiting member 251 is the same as that of the third ejection plate 231. The ejection speed of 231 is proportional to a fixed ratio, which can precisely control the movement distance of the limiting part 251. This ensures that when the third ejection plate 231 completes the second ejection stroke, the limiting part 251 is completely disengaged from the mating part 252. This avoids premature disengagement, which would cause an imbalance in the force between the third ejection plate 231 and the second ejection plate 221 during synchronous ejection. It also prevents delayed disengagement, which would hinder subsequent movement. At the same time, the mating design of the large-area inclined surface can reduce component wear, extend the service life of the mold, and further ensure the reliability of the demolding process.

[0073] In one embodiment of the present invention, please refer to Figure 2 The connecting assembly 25 also includes a reset member 254, which is connected to the third ejector plate 231 and the limiting member 251; the reset member 254 is configured to drive the limiting member 251 to move toward the fixing member 253.

[0074] In this embodiment, the reset member 254 is not limited to a spring, a rubber plunger, or the like. One end of the reset member 254 is connected to the third ejector plate 231, and the other end is connected to the limiting member 251. The reset member 254 is placed in the direction toward the mating member 252. Thus, when the reset member 254 undergoes compression deformation, the reset member 254 can drive the limiting member 251 to move toward the mating member 252, thereby causing the limiting member 251 and the mating member 252 to enter an abutting state. During the mold closing and injection stages, the limiting member 251 remains in its original position and stably abuts against the mating member 252, ensuring the relative positions of the third ejector plate 231 and the second ejector plate 221 are locked, providing a structural basis for subsequent synchronous ejection. At this time, the reset member 254 is in its original length state or slightly compressed state. When entering the second ejection stroke, the third ejector plate 231 drives the limiting member 251 to move relative to the stationary fixing member 253. The second extrusion section of the fixing member 253 extrudes the first extrusion section of the limiting member 251 through an inclined straight surface, forcing the limiting member 251 to overcome the spring force and move away from the mating member 252. As the spring moves in the direction of the ejector plate 231, it is compressed and stores elastic potential energy until the third ejector plate 231 completes the second ejection stroke, at which point the limiting member 251 and the mating member 252 are completely disengaged. When the demolding process ends and the ejector plates are reset, the third ejector plate 231 drives the limiting member 251 to move in the opposite direction. The squeezing force of the fixing member 253 on the limiting member 251 gradually disappears, the spring releases the stored elastic potential energy, and drives the limiting member 251 to move back along the original path towards the mating member 252. Finally, the limiting member 251 and the mating member 252 re-abut each other, restoring the initial locked state and preparing for the next injection-demolding cycle.

[0075] In one embodiment of the present invention, please refer to Figure 2 The third ejector plate 231 is provided with a limiting groove 231a and a limiting channel 231b, with the limiting groove 231a connected to the limiting channel 231b; one end of the fixing member 253, the limiting member 251 and the resetting member 254 are provided in the limiting groove 231a, and part of the structure of the mating member 252 is limited in the limiting channel 231b.

[0076] In this embodiment, the extension direction of the limiting channel 231b is parallel to the opening and closing direction of the mold, that is, the mold opens and closes in the vertical direction, and the limiting channel 231b extends in the vertical direction; the extension direction of the limiting groove 231a is perpendicular to the extension direction of the limiting channel 231b. At the same time, the limiting groove 231a is an open groove shape, and the opening of the limiting groove 231a faces the limiting channel 231b, so that the limiting groove 231a connects to the limiting channel 231b, and at the same time facilitates the movement of the limiting member 251 to abut or disengage from the mating member 252. The limiting groove 231a serves as the main space for accommodating the core components. The end of the fixing member 253, the limiting member 251, and the resetting member 254 are integrated within it. The groove's contour matches the shape of each component, limiting the radial offset of the end of the fixing member 253, ensuring alignment between the fixing member 253 and the movable hole of the limiting member 251. It also constrains the movement trajectory of the limiting member 251, allowing it to only move in the direction of approaching / moving away from the mating member 252, preventing lateral misalignment from causing failure of the fit with the mating member 252 and the fixing member 253. Simultaneously, it provides a stable mounting for the resetting member 254. The mounting reference is provided; while the limiting channel 231b, which is connected to the limiting groove 231a, specifically constrains the mating part 252. Its channel cross section is adapted to part of the structure of the mating part 252, such as the end of the mating part 252 facing the limiting part 251, so that the mating part 252 can only move along the extension direction of the limiting channel 231b. This ensures that the mating part 252 can be accurately aligned and abut against the limiting part 251 in the limiting groove 231a in the initial state, and maintain a stable posture when moving with the second ejection plate 221 during the synchronous ejection stage, avoiding premature or delayed separation from the limiting part 251 due to shaking. In the demolding process, initially, the reset component 254 in the limiting groove 231a pushes the limiting component 251 to stably abut against the mating component 252 in the limiting channel 231b. The boundary restriction of the limiting groove 231a and the channel prevents the components from having misfit due to vibration or slight displacement. When entering the second ejection stroke, the limiting component 251 is squeezed by the fixing component 253 in the limiting groove 231a and moves away from the mating component 252. Its range of motion is strictly limited by the groove. At the same time, the mating component 252 moves synchronously with the second ejector plate 221 in the limiting channel 231b. The channel ensures that it is always on the movement trajectory of the limiting component 251 until it is disengaged. After demolding is completed, the reset component 254 drives the limiting component 251 to move back and reset in the limiting groove 231a. The mating component 252 also returns to its position in the limiting channel 231b, and the two are re-precisely connected.

[0077] Furthermore, in order to ensure that the limiting member 251 moves strictly towards / away from the mating member 252, a guide plate is also provided in the limiting groove 231a. The guide plate is fixed in the limiting groove 231a, and the guide plate fits against the groove wall of the limiting groove 231a near the first ejector plate 211. The guide plate abuts against the end face of the limiting member 251 facing the first ejector plate 211. In this way, the guide plate can restrict the movement direction of the limiting member 251 so that the limiting member 251 only moves towards / away from the mating member 252, so as to cooperate with the mating member 252 and the fixing member 253.

[0078] In one embodiment of the present invention, please refer to Figure 2 The first ejector plate 211 has an ejector post 213 on the side facing away from the moving mold core 11. The ejector post 213 passes through the third ejector plate 231. The second ejector plate 221 has a lifting channel 221a. The ejector post 213 has a first stroke section exposed in the lifting channel 221a. The lifting channel 221a is configured to allow the ejector roller 100 to be inserted. The ejector roller 100 can abut against the first stroke section.

[0079] In this embodiment, the design of the top column 213 of the first ejector plate 211, the through structure of the third ejector plate 231, the lifting channel 221a of the second ejector plate 221, and the matching design of the top roller 100 are, in essence, to build a precise power transmission path of "top roller 100 as a single driving source to multiple ejector plates moving in stages", providing a reliable mechanical transmission foundation for the orderly execution of the three stages of demolding. From a spatial layout perspective, the top column 213, which extends from the first ejector plate 211 away from the moving mold core 11, needs to pass through the third ejector plate 231 before its first stroke section is exposed in the lifting channel 221a of the second ejector plate 221. This "through-type" structure not only ensures the coaxiality of the top column 213 during movement and avoids deviation in the transmission of driving force due to offset, but also allows the top roller 100 to be directly inserted into the lifting channel 221a from the outside of the second ejector plate 221 without crossing other ejector plates to accurately abut the first stroke section of the top column 213, thus shortening the force transmission path and reducing power loss. In the first ejection stage, the first ejection plate 211 moves independently to disconnect the flow channel 24a. The top roller 100 is initially inserted into the lifting channel 221a and only contacts the first stroke section of the top column 213. At this time, the thrust of the top roller 100 is transmitted to the first ejection plate 211 only through the top column 213. Since the length of the first stroke section is exactly matched with the first ejection stroke, the top roller 100 pushes the top column 213 to move the first ejection plate 211 independently to disconnect the flow channel 24a from the product 200. The third ejection plate 231 is only for the top column 213 to pass through and is not subjected to the thrust of the top roller 100. The top roller 100 does not contact the third ejection plate 231 so that the first ejection plate 211 moves while the second ejection plate 221 and the third ejection plate 231 remain stationary, thus achieving "independent ejection". The second ejection stage begins, i.e., the first ejection plate 211 moves. The second ejector plate 221 and the third ejector plate 231 move synchronously to disengage from the cavity. The ejector roller 100 continues to penetrate deeper into the lifting channel 221a. When the first stroke section is fully pushed into the channel, the end of the ejector column 213 will contact the end face of the third ejector plate 231. At this time, the thrust of the ejector roller 100 is transmitted sequentially to the first ejector plate 211 and the third ejector plate 231 through the ejector column 213. At the same time, the third ejector plate 231 is engaged with the second ejector plate 221 through the limiting engagement (such as the limiting member 251). The contact of part 252 drives the second ejector plate 221 to move synchronously. All three move in the same direction with the thrust of the ejector roller 100, completing the second ejection stroke and causing the product 200 to leave the cavity. The lifting channel 221a, in addition to allowing the ejector roller 100 to be inserted, also serves as a stroke limiter and guide. Its length is adapted to the total stroke of the ejector column 213 to prevent the ejector roller 100 from being over-inserted and causing damage to the parts. At the same time, it constrains the movement direction of the ejector roller 100 and the ejector column 213 to ensure that the driving force is accurately transmitted along the ejection direction.This design achieves multi-stage ejector plate movement by using a single ejector roller 100 driven in conjunction with the stroke of the ejector column 213-channel, without the need for additional drive sources. This simplifies the mold drive structure, reduces costs, and ensures direct power transmission and controllable stroke. It effectively avoids demolding jams or product damage caused by asynchronous drives, further improving the stability and accuracy of the demolding process.

[0080] In one embodiment of the present invention, please refer to Figure 3 The second ejector pin 222 includes a receiving platform 2221 and a covering section 2222. The covering section 2222 is disposed on the surface of the receiving platform 2221 and extends toward the cavity. The receiving platform 2221 is used to abut the end of the second part 202 of the article 200, and the covering section 2222 is used to cover the outer peripheral surface of the second part 202 of the article 200.

[0081] In this embodiment, the core design of the combination of the receiving platform 2221 and the covering section 2222 of the second ejector pin 222 is to enhance the constraint and pushing stability of the second part 202 of the product 200 through a composite contact method of "end face support + outer periphery covering". The second part 202 of the product 200 is a slender column, thin-walled tube or part with protrusions, which is prone to deformation due to uneven force during demolding. Specifically, the receiving platform 2221, as the basic structure that contacts the end of the second part 202 of the product 200, has a planar design that increases the contact area with the product 200, and evenly transmits the ejection force to the end of the product 200, avoiding local stress concentration caused by traditional single ejector pin point contact, and preventing the end from being dented or damaged; while the covering section 2222, which extends from the surface of the receiving platform 2221 toward the cavity, forms a radial wrapping constraint on the product 200 by conforming to the contour design of the outer periphery of the second part 202 of the product 200. During the second ejection stroke, the receiving platform 2221 provides axial thrust to push the product 200 out of the cavity. At the same time, the covering section 2222 provides radial support for the product 200 through its outer periphery covering, ensuring that the product 200 maintains structural stability while overcoming the cavity clamping force. After the second ejection stroke ends, since at least part of the product 200 has been removed from the cavity, the clamping force of the cavity on the second part 202 of the product 200 drops sharply. Therefore, during the third ejection stroke, as the first and third ejection plates 231 move the product 200, the covering constraint of the covering section 2222 will gradually be released. Since the covering section 2222 and the outer periphery of the product 200 are fitted together rather than rigidly connected, additional frictional force can be avoided during removal, which could cause scratches on the surface of the product 200.

[0082] In one embodiment of the present invention, please refer to Figure 2The mold is also provided with a fixed base plate 26 and a guide rod 27. The fixed base plate 26 is located on the side of the second ejector plate 221 facing away from the third ejector plate 231. The guide rod 27 is fixedly located on the fixed base plate 26 and passes through the second ejector plate 221, the third ejector plate 231 and the first ejector plate 211 in sequence.

[0083] In this embodiment, the fixed base plate 26 is located on the side of the second ejector plate 221 facing away from the third ejector plate 231, serving as the support base of the mold and providing a stable mounting reference for the guide rod 27. It also bears the driving force applied by the ejector roller 100 and the reaction force when each ejector plate moves, preventing deformation of the rear structure due to excessive force and ensuring the overall rigidity of the ejection system. The guide rod 27, fixed to the fixed base plate 26, passes through the second ejector plate 221, the third ejector plate 231, and the first ejector plate 211 in sequence, forming a through-type axial guide path. The parts through which the guide rod 27 passes are fitted with a high-precision sliding fit, such as a clearance fit or the addition of a guide sleeve, to strictly limit the movement direction of each ejector plate, so that it can only move along the axial direction of the guide rod 27. This completely avoids the misalignment of the ejector pins caused by the tilting or offset of the ejector plates, such as the first ejector pin 212 deviating from the flow channel 24a, or the second ejector pin 222 / third ejector pin 232 deviating from the corresponding part of the product 200.

[0084] During the first ejection stage, the guide rod 27 constrains the first ejector plate 211 to move smoothly along the axial direction, ensuring that the first ejector pin 212 accurately acts on the flow channel 24a. During the second ejection stage, the guide rod 27 ensures synchronous translation along the same axis, avoiding relative tilting caused by uneven force, and making the pushing force of the second ejector pin 222 and the third ejector pin 232 on the product 200 evenly distributed. During the third ejection stage, the guide rod 27 continues to constrain the movement trajectory of the first ejector plate 211 and the third ejector plate 231, preventing them from interfering with the stationary second ejector plate 221.

[0085] The present invention also proposes an injection molding device, which includes an injection molding machine and a mold as described above. The injection molding machine is provided with a movable top roller 100, which is used to drive the first ejector plate 211, the second ejector plate 221, and the third ejector plate 231 to move. Specifically, the top roller 100 can be inserted into the mold in an upward direction and is aligned with the ejector pin 213 of the mold. When the injection molding machine drives the top roller 100 to move toward the ejector pin 213, the force exerted by the top roller 100 on the ejector pin 213 can cause the first ejector plate 211, the second ejector plate 221, and the third ejector plate 231 to undergo demolding movement, thereby realizing the demolding of the product 200. The specific structure of the mold is as described in the above embodiments. Since the injection molding device proposed in this invention adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0086] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A mold for use in an injection molding apparatus for injection molding an article (200), the injection molding apparatus having a top roll (100), characterized in that, The mold comprises: a movable mold (10) provided with a movable mold core (11); a fixed mold (20) comprising a fixed mold core (24), a first ejection assembly (21), a second ejection assembly (22), and a third ejection assembly (23), the fixed mold core (24) and the movable mold core (11) enclosing a cavity, the fixed mold core (24) having a flow channel (24a) communicating with the cavity; the first ejection assembly (21) having a first ejection plate (211) movable relative to the fixed mold core (24) and a first ejector pin (212), the first ejection plate (211) being located on the side of the fixed mold core (24) away from the movable mold core (11), the first ejector pin (212) being provided on the first ejection plate (211) and positioned opposite the flow channel (24a); the second ejection assembly (22) having a second ejection plate (221) movable relative to the fixed mold core (24) and a second ejector pin (222), the second ejection plate (221) being located on the side of the first ejection plate (211) away from the movable mold core (11), the second ejector pin (222) being provided on the second ejection plate (221) and positioned opposite a first part (201) of the product (200); the third ejection assembly (23) having a third ejection plate (231) movable relative to the fixed mold core (24) and a third ejector pin (232), the third ejection plate (231) being located between the first ejection plate (211) and the second ejection plate (221), the third ejector pin (232) being provided on the third ejection plate (231) and positioned opposite a second part (202) of the product (200); wherein the top roller (100) is used to drive the first ejection plate (211), the second ejection plate (221), and the third ejection plate (231) to move, when the first ejection plate (211) moves a first ejection stroke relative to the cavity, the flow channel (24a) is disconnected from the product (200); when the first ejection plate (211), the second ejection plate (221), and the third ejection plate (231) move a second ejection stroke relative to the cavity synchronously, the product (200) is separated from the cavity; when the first ejection plate (211) and the third ejection plate (231) move a third ejection stroke relative to the cavity, the product (200) is separated from the second ejector pin (222).

2. The mold of claim 1, wherein, The mold further comprises a connecting assembly (25) comprising a limiting piece (251) and a cooperating piece (252) that can be connected and disconnected to each other, the limiting piece (251) being movably provided on the third ejection plate (231), one end of the cooperating piece (252) being limitingly connected with the second ejection plate (221), and the other end of the cooperating piece (252) abutting against the side of the limiting piece (251) away from the second ejection plate (221). When the first ejection plate (211), the second ejection plate (221) and the third ejection plate (231) move synchronously relative to the cavity for a second ejection stroke, the limiting piece (251) can move away from the matching piece (252) to make the matching piece (252) and the limiting piece (251) disengage with each other.

3. The mold of claim 2, wherein, The connecting assembly (25) further comprises a fixing piece (253), one end of the fixing piece (253) is fixedly connected with the movable die core (11), and the other end of the fixing piece (253) is inserted into the third ejection plate (231) and abuts against the limiting piece (251); When the first ejection plate (211), the second ejection plate (221) and the third ejection plate (231) move synchronously relative to the cavity for a second ejection stroke, the fixing piece (253) drives the matching piece (252) to move away from the limiting piece (251).

4. The mold of claim 3, wherein The limiting piece (251) is provided with a movable hole, and the end of the fixing piece (253) abuts against the inner peripheral wall of the movable hole; The inner peripheral wall of the movable hole has a first extrusion section, and the end of the fixing piece (253) has a second extrusion section matched with the first extrusion section, and the second extrusion section abuts against the first extrusion section.

5. The mold of claim 3, wherein The connecting assembly (25) further comprises a reset piece (254), the reset piece (254) connects the third ejection plate (231) and the limiting piece (251); and the reset piece (254) is configured to drive the limiting piece (251) to move towards the fixing piece (253).

6. The mold of claim 5, wherein The third ejection plate (231) is provided with a limiting groove (231a) and a limiting channel (231b), and the limiting groove (231a) communicates with the limiting channel (231b); One end of the fixing piece (253), the limiting piece (251) and the reset piece (254) are arranged in the limiting groove (231a), and part of the structure of the matching piece (252) is limited in the limiting channel (231b).

7. The mold of any one of claims 1 to 6, wherein, The side of the first ejection plate (211) away from the movable die core (11) is provided with a jacking column (213), the jacking column (213) penetrates through the third ejection plate (231), the second ejection plate (221) has a jacking channel (221a), and the jacking column (213) has a first stroke section exposed in the jacking channel (221a); The jacking channel (221a) is configured to be inserted by a jacking roller (100), and the jacking roller (100) can abut against the first stroke section.

8. The mold of claim 1, wherein The second ejector pin (222) comprises a receiving platform (2221) and a cladding section (2222), the cladding section (2222) is arranged on the surface of the receiving platform (2221) and extends towards the cavity; The receiving platform (2221) is used for abutting against the end of the second part (202) of the product (200), and the cladding section (2222) is used for cladding the peripheral surface of the second part (202) of the product (200).

9. The mold of claim 1, wherein, The mold is further provided with a fixed bottom plate (26) and a guide rod (27), the fixed bottom plate (26) is arranged on the side of the second ejection plate (221) away from the third ejection plate (231), and the guide rod (27) is fixedly arranged on the fixed bottom plate (26) and sequentially penetrates the second ejection plate (221), the third ejection plate (231) and the first ejection plate (211).

10. An injection molding apparatus characterized by comprising: The injection molding equipment comprises an injection molding machine and the mold according to any one of claims 1 to 9, and the injection molding machine is provided with a movable top roller (100) for driving the first ejection plate (211), the second ejection plate (221) and the third ejection plate (231) to move.

Images