Mold and injection molding equipment

Abstract

The invention relates to the technical field of mold demolding, in particular to a mold and injection molding device.The mold comprises a movable mold and a fixed mold, and the movable mold is provided with a movable mold core; the fixed mold comprises a fixed mold core, a first ejection assembly, a second ejection assembly, a third ejection assembly and a fixed plate, a cavity is defined by the fixed mold core and the movable mold core, and the fixed mold core is provided with a runner communicating with the cavity; wherein the ejection roller is used for driving the first ejection plate, the second ejection plate and the third ejection plate to move, and after the first ejection plate moves relative to the cavity by a first ejection stroke, the runner is disconnected with a product; after the first ejection plate, the second ejection plate and the third ejection plate synchronously move relative to the cavity for a second ejection stroke, the product is separated from the cavity; and after the first ejector plate and the third ejector plate move relative to the cavity for a third ejection stroke, the product is separated from the second ejector pin. The invention mainly aims at providing a mold, aiming at avoiding the problem that a pouring gate is bounced and damaged when a product is demolded, and reducing the demolding difficulty.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mold demolding, in particular to a mold and an injection molding equipment. BACKGROUND

[0002] Injection molding is one of the widely used molding technologies in the field of plastic processing. The basic process is as follows: granular or powdered plastic raw materials are added to the barrel of an injection molding machine, the raw materials are melted and plasticized by the heating device of the barrel to form a flowing injection medium, then the screw or plunger of the injection molding machine pushes the injection medium into the pre-closed mold cavity at high pressure, the injection medium fills the cavity and solidifies after cooling, the mold opening mechanism drives the mold to separate, and finally the molded workpiece is taken out of the mold. This technology is suitable for mass production of various complex-shaped plastic parts. In related technologies, the mold is usually provided with a flow channel communicating with the cavity for guiding the injection medium to smoothly enter the cavity. However, during the cooling stage after injection molding, the residual injection medium in the flow channel will cool and solidify into a solid state together with the injection medium in the cavity. This part of solid flow channel medium will form a close fixed connection with the molded workpiece in the cavity. On the other hand, due to the different functional and appearance requirements of workpieces in different application scenarios, the shape design of the workpiece is often complex and diverse. The special structure (such as protrusion, groove, thin wall, etc.) of part of the workpiece will cause the channel in the mold cavity that matches it to have a large holding force on the local structure of the workpiece, making it difficult to separate easily.

[0003] Based on the above two factors, when the conventional injection molding equipment performs demolding operation, whether it is through mechanical ejection or pneumatic ejection to apply demolding force, it is easy to damage the structural stability of the workpiece due to the pulling action of the flow channel medium and the holding action of the cavity channel, resulting in deformation phenomena such as warping, cracking, and depression of the workpiece. At the same time, the instantaneous separation of the flow channel medium and the workpiece connection part during the demolding process will also generate an impact force, making the workpiece obtained after demolding prone to gate pop injury problems such as material shortage, scratches, and damage at the gate position (connection position of the flow channel and the cavity), which seriously affects the product quality and qualification rate of the workpiece. SUMMARY

[0004] The main purpose of the present application is to provide a mold which aims to avoid the problem of gate pop injury of the product during demolding and reduce the difficulty of demolding.

[0005] To achieve the above purpose, the mold is applied to an injection molding equipment, the injection molding equipment is used for injection molding of products, and the injection molding equipment has a top roller. The mold comprises: a movable mold provided with a movable mold core; The fixed mold comprises a fixed mold core, a first ejection assembly, a second ejection assembly, a third ejection assembly and a fixed plate, the fixed mold core and the movable mold core enclose a cavity, the fixed mold core has a flow channel communicating with the cavity; The first ejection assembly has a first ejection plate and a first ejector pin, the first ejection plate is located on the side of the fixed mold core away from the movable mold core, and the first ejector pin is arranged on the first ejection plate and is positioned at the flow channel; The second ejection assembly has a second ejection plate and a second ejector pin, the second ejection plate is located on the side of the first ejection plate away from the movable mold core, and the second ejector pin is arranged on the second ejection plate and is positioned at the first part of the product; The third ejection assembly has a third ejection plate and a third ejector pin, the third ejection plate is located between the first ejection plate and the second ejection plate, and the third ejector pin is arranged on the third ejection plate and is positioned at the second part of the product; The top roller is used to drive the first ejection plate, the second ejection plate and the third ejection plate to move, when the first ejection plate moves a first ejection stroke relative to the cavity, the flow channel is disconnected from the product; when the first ejection plate, the second ejection plate and the third ejection plate move a second ejection stroke relative to the cavity synchronously, the product is separated from the cavity; when the first ejection plate and the third ejection plate move a third ejection stroke relative to the cavity, the product is separated from the second ejector pin.

[0006] In an embodiment of the present application, the mold further comprises a connecting assembly, the connecting assembly comprises a limiting piece and a matching piece which can be connected and disconnected with each other, the limiting piece is movably arranged on the third ejection plate, one end of the matching piece is connected with the second ejection plate, and the other end of the matching piece abuts against the side of the limiting piece away from the second ejection plate; When the first ejection plate, the second ejection plate and the third ejection plate move a second ejection stroke relative to the cavity synchronously, the limiting piece can move away from the matching piece to be disconnected with the matching piece.

[0007] In an embodiment of the present application, the connecting assembly further comprises a fixing piece, one end of the fixing piece is fixedly connected with the movable mold core, and the other end of the fixing piece is inserted into the third ejection plate and abuts against the limiting piece; When the first ejection plate, the second ejection plate and the third ejection plate move a second ejection stroke relative to the cavity synchronously, the fixing piece drives the matching piece to move away from the limiting piece.

[0008] In an embodiment of the present application, the limiting member is provided with a movable hole, and an end of the fixing member abuts against an 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 member has a second extrusion section adapted to the first extrusion section, and the second extrusion section abuts against the first extrusion section.

[0009] In an embodiment of the present application, the connecting assembly further comprises a reset member, which connects the third ejector plate and the limiting member; the reset member is configured to drive the limiting member to move towards the fixing member.

[0010] In an embodiment of the present application, the third ejector plate is provided with a limiting groove and a limiting channel, and the limiting groove communicates with the limiting channel. One end of the fixing member, the limiting member and the reset member are arranged in the limiting groove, and part of the structure of the fitting member is limited in the limiting channel.

[0011] In an embodiment of the present application, the first ejector plate is provided with a jacking post on a side opposite to the movable die core, the jacking post penetrates the third ejector plate, the second ejector plate has a jacking channel, and the jacking post has a first stroke section exposed in the jacking channel. The jacking channel is configured to allow a jacking roller to be inserted, and the jacking roller can abut against the first stroke section.

[0012] In an embodiment of the present application, the second ejector pin comprises a receiving platform and a cladding section, and the cladding section is arranged on a surface of the receiving platform and extends towards the cavity; The receiving platform is used to abut against an end of the second part of the product, and the cladding section is used to clad an outer peripheral surface of the second part of the product.

[0013] In an embodiment of the present application, the mold further comprises a fixed base plate and a guide rod, the fixed base plate is arranged on a side of the second ejector plate opposite to the third ejector plate, and the guide rod is fixedly arranged on the fixed base plate and penetrates the second ejector plate, the third ejector plate and the first ejector plate in sequence.

[0014] The present application further provides an injection molding equipment, which comprises an injection molding machine and the mold according to any one of the above-mentioned embodiments, and the injection molding machine is provided with a movable jacking roller, which is used to drive the first ejector plate, the second ejector plate and the third ejector plate to move.

[0015] In the technical solution, first, the first ejection stroke is used to separately move the first ejection plate, so that the first ejector driving channel of the alignment runner is disconnected from the product in advance, avoiding the pulling effect when the runner medium and the product are simultaneously separated in the conventional demolding, and eliminating the impact force when the runner and the product are instantaneously separated, thus fundamentally solving the sprue pop problem; then, the second ejection stroke is used to synchronously move the first, second and third ejection plates, so that the second ejector and the third ejector jointly act on different parts of the product, the ejection force is dispersed to multiple areas, the local stress concentration caused by single ejection is avoided, the holding force of the cavity due to protrusions, grooves, thin walls and other special structures is effectively resisted, and the deformation such as warping, cracking and depression of the workpiece is prevented; finally, the third ejection stroke is used to move the first and third ejection plates to separate the product from the second ejector, so that the demolding process is controllable, and subsequent interference deformation is further avoided; the orderly separation of the runner disconnection and the product demolding is realized by the staged ejection, the ejection force is dispersed by the multiple ejectors, the runner pulling and the sprue pop problem are solved, the demolding difficulty caused by the cavity holding force is relieved, the structure stability and the appearance quality of the product are significantly improved, the product qualification rate is improved, the demolding requirement of the complex-shaped product is met, the demolding operation difficulty of the injection molding equipment is reduced, and the practicability and adaptability of the mold are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The structural schematic diagram of an embodiment of the mold provided by the present application; Figure 2 The internal structural schematic diagram of an embodiment of the mold provided by the present application; Figure 3 The cooperation diagram between the ejector pin and the product provided by the present application.

[0018] Explanation of reference numerals: 100, top roller; 200, product; 201, first part; 202, second part; 10, moving die; 11, moving die core; 20, fixed die; 21, first ejection assembly; 211, first ejection plate; 212, first ejector pin; 213, ejector pin; 22. Second ejection assembly; 221. Second ejection plate; 221a. Lifting channel; 222. Second ejector pin; 2221. Supporting platform; 2222. Covering section; 23. Third ejection assembly; 231. Third ejection plate; 231a. Limiting groove; 231b. Limiting channel; 232. Third ejector pin; 24. Fixed die core; 24a. Runner; 25. Connecting assembly; 251. Limiting piece; 252. Cooperating piece; 253. Fixing piece; 254. Resetting piece; 26. Fixed base plate; 27. Guide rod.

[0019] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0021] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0022] In addition, the description of “first”, “second” and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the meaning of “and / or” appearing throughout the text includes three parallel schemes, taking “A and / or B” as an example, including A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0023] Applicants find that in the injection molding process, when the surface of the product contains small size and fine structure protruding features, if the ejector pin is only arranged in the non-protruding area of the part, it may cause quality problems due to uneven stress during demolding. Because the cavity has a strong holding force on the protruding part, during ejection, the main body of the part is pushed by the ejection system to separate from the mold, while the protruding part is still locally bound by the cavity. This unbalanced demolding force easily makes the protruding area bear excessive tensile or shear stress during dynamic demolding, and then causes plastic deformation, micro-cracks or even breakage of the part, which seriously affects the molding quality and structural integrity of the part.

[0024] The main purpose of the present application is to provide a mold which aims to avoid the problem of sprue pop injury of the product 200 during demolding, and reduce the difficulty of demolding.

[0025] To achieve the above purpose, the mold is applied to an injection molding equipment for injection molding a product 200, the injection molding equipment has an ejection roller 100, please refer to Figure 1 , 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, a third ejection assembly 23 and a fixed plate, the fixed mold core 24 and the movable mold core 11 form a cavity, and the fixed mold core 24 has a flow channel 24a communicating with the cavity; The first ejection assembly 21 has a first ejection plate 211 movable relative to the fixed mold core 24 and a first ejector pin 212, the first ejection plate 211 is located on the side of the fixed mold core 24 away from the movable mold core 11, and the first ejector pin 212 is arranged on the first ejection plate 211 and is aligned with the flow channel 24a; The second ejection assembly 22 has a second ejection plate 221 movable relative to the fixed mold core 24 and a second ejector pin 222, the second ejection plate 221 is located on the side of the first ejection plate 211 away from the movable mold core 11, and the second ejector pin 222 is arranged on the second ejection plate 221 and is aligned with the first part 201 of the product 200; The third ejection assembly 23 has a third ejection plate 231 movable relative to the fixed mold core 24 and a third ejector pin 232, the third ejection plate 231 is located between the first ejection plate 211 and the second ejection plate 221, and the third ejector pin 232 is arranged on the third ejection plate 231 and is aligned with the second part 202 of the product 200; 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 with 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, 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.

[0026] The movable mold 10 is one of the core components in the mold that cooperates with the fixed mold 20 to realize injection molding and demolding. The movable mold 10 is controlled to move to open and close the mold. The movable mold core 11 is the core functional structure of the movable mold 10. When the mold is closed, the movable mold core 11 precisely docks with the fixed mold core 24 of the fixed mold 20 and encloses to form a cavity for accommodating an injection medium. The injection medium is cooled and solidified in the cavity to form a product 200. At the same time, the movable mold 10 can be driven by the mold opening and closing mechanism of the injection equipment to move relative to the fixed mold 20 to realize the opening and closing actions of the mold. When the mold is closed, the cavity is sealed to complete the injection. When the mold is opened, it provides the necessary space for the subsequent ejection assembly to push the product 200 to demold, which is the basic component to ensure the smooth development of the injection molding process.

[0027] The fixed mold 20 is a core fixed component of the mold which bears the cavity forming, the flow channel 24a guiding and the multiple ejection assemblies, and it includes the fixed mold core 24, the first ejection assembly 21, the second ejection assembly 22 and the third ejection assembly 23. The fixed mold core 24 cooperates with the movable mold core 11 to form the cavity, and the flow channel 24a which communicates with the cavity is arranged on the fixed mold core 24, which is used to guide the molten injection medium to flow into the cavity stably during the injection molding process. The first ejection assembly 21 includes the first ejection plate 211 and the first ejector pin 212, and the first ejection plate 211 is located on the side of the fixed mold core 24 which is away from the movable mold core 11. The first ejector pin 212 is arranged on the first ejection plate 211 and is 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 the second ejection plate 221 and the second ejector pin 222, and the second ejection plate 221 is located on the side of the first ejection plate 211 which is away from the movable mold core 11. The second ejector pin 222 is arranged on the second ejection plate 221 and is aligned with the first part 201 of the product 200, which is used to apply the ejection force to the specific part of the product 200. The first part 201 of the product 200 refers to the small-sized and thin-structured protruding feature of the product 200. The third ejection assembly 23 includes the third ejection plate 231 and the third ejector pin 232, and 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 arranged on the third ejection plate 231 and is aligned with the second part 202 of the product 200, which cooperates with the second ejection assembly 22 to disperse the ejection force. The second part 202 of the product 200 refers to the non-protruding part of the product 200, such as the end face, the side face and the like of the product 200. It can be understood that the distance between the first ejection plate 211 and the fixed mold core 24 is at least greater than the total distance of the first ejection stroke, the second ejection stroke and the third ejection stroke, so as to facilitate the implementation of the three demolding actions.

[0028] The movable mold core 11, the fixed mold core 24, the first ejection plate 211, the third ejection plate 231 and the second ejection plate 221 are arranged in sequence, and from the direction close to the cavity in which the product 200 is formed to the direction away from the cavity, each component is linearly and orderly arranged, wherein the movable mold core 11 is located at the forefront as a dynamic component directly participating in the formation of the cavity, and the fixed mold core 24 immediately adjacent to the movable mold core 11 is a fixed component of the cavity, and the two components jointly form a space (cavity) for filling and solidifying the injection medium, and the flow channel 24a on the fixed mold core 24 can directly communicate with the cavity to ensure accurate delivery of the injection medium; the first ejection plate 211 is immediately adjacent to the rear of the fixed mold core 24, which can make the first ejector pin 212 on the first ejection plate 211 align with the flow channel 24a of the fixed mold core 24 with the shortest stroke, and provide a structural basis for the subsequent rapid pushing of the flow channel 24a medium and the product 200 to disconnect, avoiding the action delay or force transmission loss caused by too long stroke; the third ejection plate 231 is connected to the rear of the first ejection plate 211, and the third ejection plate 231 is located at an intermediate transition position, which will not interfere with the independent movement of the first ejection plate 211 (complete separation of the flow channel 24a), and can form a stable linkage relationship with the first ejection plate 211 and the second ejection plate 221 in the synchronous ejection stage, to ensure that the third ejector pin 232 (aligning with the second part 202 of the product 200) and the second ejector pin 222 (aligning with the first part 201 of the product 200) are accurately matched to realize uniform dispersion of the ejection force; the second ejection plate 221 is located at the end position of the entire ejection assembly, which can be used as the basic support component of the ejection system, and at the same time avoid interference with the independent action of the first and third ejection plates 231 due to the position in front, to ensure that each ejection assembly can independently complete a specific action in the staged demolding process, and can also cooperate with each other in the synchronous stage to generate force, and the overall layout is compact and the logic is clear, which provides spatial structural protection for the smooth execution of the staged demolding process.

[0029] The mold has at least the following three actions when demolding. The first step after opening the mold is to disconnect the flow channel 24a from the product 200. The top roller 100 of the injection molding equipment only drives the first ejection plate 211 to move a first ejection stroke relative to the cavity. At this time, the first ejector pin 212 connected with the first ejection plate 211 moves with it. Since the first ejector pin 212 is aligned with the flow channel 24a, it will push the solidified medium in the flow channel 24a, so that the flow channel 24a and the product 200 are separated at the gate position, avoiding that the medium in the flow channel 24a pulls the product 200 during subsequent demolding. The second step is to separate the product 200 from the cavity. The top roller 100 drives the first ejection plate 211, the second ejection plate 221 and the third ejection plate 231 to move a second ejection stroke relative to the cavity. At this time, the first ejector pin 212 (which has completed the separation of the flow channel 24a), the second ejector pin 222 (which is aligned with the first part 201 of the product 200) and the third ejector pin 232 (which is aligned with the second part 202 of the product 200) jointly act to disperse the ejection force to different parts of the product 200, effectively resisting the holding force generated by the cavity due to the special structure of the product 200, and pushing the product 200 to completely separate from the cavity. The third step is to separate the product 200 from the second ejector pin 222. The top roller 100 drives the first ejection plate 211 and the third ejection plate 231 to move a third ejection stroke relative to the cavity. The first ejector pin 212 and the third ejector pin 232 moving with the first and third ejection plates 231 will drive the product 200 to continue moving, so that the product 200 is separated 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 taking.

[0030] In the technical solution, first, the first ejection plate 211 moves alone a first ejection stroke, so that the first ejector pin 212 of the alignment runner 24a drives the runner 24a to be disconnected from the product 200 in advance, avoiding the pulling effect when the runner 24a medium and the product 200 are synchronously separated in the conventional demolding, and eliminating the impact force of the instantaneous separation of the runner 24a and the product 200, thus fundamentally solving the sprue pop problem; then, the first, second and third ejection plates 231 move synchronously a second ejection stroke, so that the second ejector pin 222 and the third ejector pin 232 jointly act on different parts of the product 200, dispersing the ejection force to multiple areas, avoiding the local force concentration caused by single ejection, effectively resisting the holding force of the cavity due to special structures such as protrusions, grooves and thin walls, and preventing the workpiece from being deformed such as warping, cracking and sinking; finally, the first and third ejection plates 231 move a third ejection stroke to make the product 200 separate from the second ejector pin 222, ensuring that the demolding process is controllable throughout, and further avoiding subsequent interference deformation; through the phased ejection, the runner 24a is disconnected and the product 200 is demolded in an orderly separation, and through the multiple ejector pins, the ejection force is dispersed, which not only completely solves the problems of the runner 24a pulling and the sprue pop, but also relieves the demolding difficulty caused by the holding force of the cavity, significantly improves the structural stability and appearance quality of the product 200, improves the product pass rate, adapts to the demolding requirements of the complex-shaped product 200, reduces the demolding operation difficulty of the injection molding equipment, and enhances the practicality and adaptability of the mold.

[0031] In the technical solution, first, the first ejection plate 211 moves alone a first ejection stroke, so that the first ejector pin 212 of the alignment runner 24a drives the runner 24a to be disconnected from the product 200 in advance, avoiding the pulling effect when the runner 24a medium and the product 200 are synchronously separated in the conventional demolding, and eliminating the impact force of the instantaneous separation of the runner 24a and the product 200, thus fundamentally solving the sprue pop problem; then, the first, second and third ejection plates 231 move synchronously a second ejection stroke, so that the second ejector pin 222 and the third ejector pin 232 jointly act on different parts of the product 200, dispersing the ejection force to multiple areas, avoiding the local force concentration caused by single ejection, effectively resisting the holding force of the cavity due to special structures such as protrusions, grooves and thin walls, and preventing the workpiece from being deformed such as warping, cracking and sinking; finally, the first and third ejection plates 231 move a third ejection stroke to make the product 200 separate from the second ejector pin 222, ensuring that the demolding process is controllable throughout, and further avoiding subsequent interference deformation; through the phased ejection, the runner 24a is disconnected and the product 200 is demolded in an orderly separation, and through the multiple ejector pins, the ejection force is dispersed, which not only completely solves the problems of the runner 24a pulling and the sprue pop, but also relieves the demolding difficulty caused by the holding force of the cavity, significantly improves the structural stability and appearance quality of the product 200, improves the product pass rate, adapts to the demolding requirements of the complex-shaped product 200, reduces the demolding operation difficulty of the injection molding equipment, and enhances the practicality and adaptability of the mold.

[0032] In an embodiment of the present application, referring to Figure 2 , Figure 2 As shown in the structural schematic diagram after the mold is opened, the mold is further provided with a connecting assembly 25, which comprises a limiting piece 251 and a matching piece 252 that can be connected and disconnected with each other. The limiting piece 251 is movably arranged on the third ejection plate 231. One end of the matching piece 252 is limitingly connected with the second ejection plate 221, and the other end of the matching piece 252 abuts against one 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 in the second ejection stroke relative to the cavity, the limiting piece 251 can move away from the matching piece 252 to make the matching piece 252 disconnected with the limiting piece 251.

[0033] In the present embodiment, the connecting assembly 25 is arranged to precisely control the relative movement relationship between the third ejection plate 231 and the second ejection plate 221 in different demolding stages by the connectable / disconnectable characteristics of the limiting piece 251 and the matching piece 252, so as to further ensure the stability and orderliness of the staged demolding process. Specifically, the limiting piece 251 is movably arranged on the third ejection plate 231, and one end of the matching piece 252 is limitingly connected with the second ejection plate 221, and the other end of the matching piece 252 abuts against one side of the limiting piece 251 away from the second ejection plate 221. In the first ejection movement stage of demolding, i.e., when the first ejection plate 211 moves alone in the first ejection stroke, the limiting piece 251 and the matching piece 252 form a stable abutting limiting relationship, which can avoid the dislocation of the third ejection plate 231 and the second ejection plate 221 due to external force or gravity, and ensure that the two maintain the preset relative position in the subsequent synchronous ejection stage. When the demolding enters the second ejection movement stage, i.e., the first, second and third ejection plates 231 move synchronously to push the product 200 out of the cavity, with the synchronous movement of the ejection plates in the direction away from the cavity, the limiting piece 251 will gradually move away from the matching piece 252 and finally be disconnected with the matching piece 252 along with the movement of the second ejection plate 221. This disconnection design ensures that the second ejection plate 221 and the third ejection plate 231 can cooperate to generate force in the synchronous ejection stage, and the second ejector pin 222 and the third ejector pin 232 can uniformly transmit the ejection force to the first part 201 and the second part 202 of the product 200, effectively resisting the cavity holding force to prevent the product 200 from deforming. In addition, the disconnection design removes the structural obstacle in the subsequent third ejection stage (the first and third ejection plates 231 move in the third ejection stroke, and the second ejection plate 221 is stationary), avoids the continuous limiting of the matching piece 252, and ensures that the third ejection plate 231 cannot move with the first ejection plate 211, so that the product 200 can be smoothly disconnected from the second ejector pin 222. Finally, through the precise control of the movement relationship of the ejection plates, the demolding difficulty is further reduced, and the risk of deformation and sprue pop of the product 200 in the demolding process is reduced.

[0034] The end of the fitting part 252 abutting against the limiting part 251 is provided with a barb structure, the side of the barb structure facing the limiting part 251 is provided with an abutting plane, the abutting plane abuts against the limiting part 251, and the abutting plane abuts against the side of the limiting part 251 away from the second ejection plate 221. The limiting part 251 is above the second ejection plate 221. Thus, under the action of gravity, the fitting part 252 and the limiting part 251 are limitedly matched, that is, the second ejection plate 221 and the third ejection plate 231 are connected through the fitting part 252 and the limiting part 251, the fitting part 252 and the limiting part 251 are separated, and the second ejection plate 221 and the third ejection plate 231 are also separated, that is, from the second step after the mold is opened to the third step.

[0035] The "limiting part 251 can move away from the fitting part 252" means that the limiting part 251 can be moved away from the fitting part 252 by one or more movements such as translation and rotation. In an embodiment, the limiting part 251 can be translated to gradually move away from the fitting part 252. Specifically, the second ejection plate 221 is provided with a servo cylinder, the piston rod of the servo cylinder is connected to the limiting part 251, and the movement stroke of the piston rod is matched with the second ejection stroke, that is, when the first ejection plate 211, the second ejection plate 221 and the third ejection plate 231 start to move together to the second ejection stroke, the piston rod of the servo cylinder is correspondingly retracted to separate the limiting part 251 from the fitting part 252. In another embodiment, the limiting part 251 can be rotated to gradually move away from the fitting part 252. Specifically, the limiting part 251 is rotatably installed on the third ejection plate 231 through a rotating shaft and can swing between a limiting position and a separation position. The second ejection plate 221 is provided with a rotating motor, and the output shaft of the rotating motor is connected to the limiting part 251 through a connecting rod mechanism or directly. When it is needed to separate the limiting part 251 from the fitting part 252, the rotating motor receives a control signal and drives the limiting part 251 to rotate around the rotating shaft, so that the part with the abutting plane deviates from the original position aligned with the barb structure of the fitting part 252, thereby separating the two. The angular displacement and timing of the rotating action are also precisely matched with the second ejection stroke, so that the limiting part 251 can be accurately and timely rotated to the separation position at the end of the synchronous ejection stage, thereby creating conditions for the step-by-step movement of the subsequent ejection plate.

[0036] In an embodiment of the present application, referring to Figure 2 The connecting assembly 25 further comprises a fixing part 253, one end of the fixing part 253 is fixedly connected to the movable die core 11, and the other end of the fixing part 253 is inserted into the third ejection plate 231 and abuts against the limiting part 251. When the first ejection plate 211, the second ejection plate 221 and the third ejection plate 231 move synchronously by the second ejection stroke relative to the cavity, the fixing part 253 drives the fitting part 252 to move away from the limiting part 251.

[0037] In the embodiment, the third ejection plate 231 has a containing space for the fixed part 253 to move up and down, one end of the fixed part 253 is fixedly connected with the movable die core 11, and the other end of the fixed part 253 is inserted into the containing space, as shown in the figure. Figure 2 When the mold is opened, the movable die core 11 can drive the fixed part 253 to move up by a certain distance, at this time, the end of the fixed part 253 away from the movable die core 11 can smoothly exit the containing space and abut against the limiting part 251, after the mold is opened, the movable die core 11 is stationary relative to the fixed die 20, at this time, the fixed part 253 fixedly connected with the movable die core 11 is also in a stationary state; when the first ejection plate 211, the second ejection plate 221 and the third ejection plate 231 move synchronously with the cavity by a second ejection stroke, the third ejection plate 231 moves relative to the fixed part 253, and the limiting part 251 located on the third ejection plate 231 can move relative to the fixed part 253, in this way, the movement of the limiting part 251 relative to the fixed part 253 provides the movement condition for the fixed part 253 to drive the cooperating part 252 to move 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 exert an acting force on the limiting part 251, under the action of the acting force, the fixed part 253 forces the limiting part 251 to move away from the cooperating part 252, after the third ejection plate 231 moves by the second ejection stroke, the limiting part 251 is separated from the cooperating part 252, and the whole process realizes the separation action through the precise cooperation of the mechanical structure, without the need for an additional power source, which improves the stability and reliability of the demolding process.

[0038] In an embodiment of the present application, please refer to Figure 2 The limiting part 251 is provided with a movable hole, and the end of the fixed part 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 fixed part 253 has a second extrusion section matched with the first extrusion section, and the second extrusion section abuts against the first extrusion section.

[0039] In the embodiment, the first extrusion section and the second extrusion section are both arranged in an inclined straight surface, that is, along the direction from the third ejection plate 231 to the movable die core 11, the cross-sectional dimension of the end of the fixed part 253 away from the movable die core 11 gradually increases, and the aperture of the movable hole gradually increases. In this way, the second extrusion section at the end of the fixed part 253 can be completely matched with the first extrusion section of the movable hole to form a large-area and gap-free contact fit, thereby avoiding local stress concentration caused by point contact or line contact and laying a foundation for uniform transmission of subsequent force. Further, in combination with the movement relationship in the demolding process, when the first ejection plate 211, the second ejection plate 221 and the third ejection plate 231 move synchronously in the direction toward the cavity in the second ejection stroke, the fixed part 253 is in a static state due to the fixed connection with the movable die core 11. At this time, the third ejection plate 231 will drive the limiting part 251 to move linearly relative to the fixed part 253 and close to the movable die core 11. Since the first extrusion section and the second extrusion section are inclinedly matched, the static second extrusion section will generate an extrusion force along the normal direction of the inclined surface on the moving first extrusion section. The extrusion force can be decomposed into two components: one along the ejection direction (consistent with the movement direction of the third ejection plate 231 and does not interfere with the ejection action), and the other perpendicular to the ejection direction (i.e., pointing away from the matched part 252). The perpendicular component becomes the driving force of the limiting part 251, which pushes the limiting part 251 to move stably away from the matched part 252 along the preset movement path of the third ejection plate 231. Since the angle of the inclined surface is fixed, the movement speed of the limiting part 251 and the ejection speed of the third ejection plate 231 have a fixed proportional relationship, which can accurately control the movement distance of the limiting part 251, so that the limiting part 251 is completely separated from the matched part 252 when the third ejection plate 231 completes the second ejection stroke. This avoids the imbalance of the stress on the third ejection plate 231 and the second ejection plate 221 caused by early separation during synchronous ejection, and prevents the hindering of subsequent movement caused by late separation. In addition, the large-area inclined surface design can also reduce the wear of the parts and prolong the service life of the mold, thereby further ensuring the reliability of the demolding process.

[0040] In an embodiment of the present application, referring to Figure 2 The connecting assembly 25 further includes a resetting part 254 connected to the third ejection plate 231 and the limiting part 251. The resetting part 254 is configured to drive the limiting part 251 to move toward the fixed part 253.

[0041] In the embodiment, the reset member 254 is not limited to one of spring, rubber plunger, etc. One end of the reset member 254 is connected to the third ejection plate 231, and the other end is connected to the limiting member 251. The reset member 254 is placed in a direction towards the matching member 252. Thus, when the reset member 254 is compressed, the reset member 254 can drive the limiting member 251 to move towards the matching member 252, so that the limiting member 251 and the matching member 252 enter the abutting state. In the mold closing and injection stage, the limiting member 251 is in the original position and keeps stable abutment with the matching member 252, ensuring the relative position of the third ejection plate 231 and the second ejection plate 221 is locked, providing a structural basis for subsequent synchronous ejection. At this time, the reset member 254 is in the original length state or slightly compressed state. When entering the second ejection stroke, the third ejection 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 the inclined straight surface, forcing the limiting member 251 to move away from the matching member 252 against the elastic force of the spring. At this time, the spring is compressed and stores elastic potential energy, until the third ejection plate 231 completes the second ejection stroke, and the limiting member 251 and the matching member 252 are completely separated. When the demolding process is completed and each ejection plate is reset, the third ejection plate 231 drives the limiting member 251 to move reversely. The extrusion force of the fixing member 253 on the limiting member 251 gradually disappears, the spring releases the stored elastic potential energy, drives the limiting member 251 to move back to the matching member 252 along the original path, and finally makes the limiting member 251 and the matching member 252 abut again, restoring the initial locking state and preparing for the next injection-molding and demolding cycle.

[0042] In an embodiment of the present application, referring to Figure 2 , 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 member 253, the limiting member 251 and the reset member 254 are arranged in the limiting groove 231a, and part of the structure of the matching member 252 is limited in the limiting channel 231b.

[0043] In the 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 along the vertical direction, and the limiting channel 231b extends along the vertical direction; the extension direction of the limiting groove 231a is perpendicular to the extension direction of the limiting channel 231b, and at the same time, the limiting groove 231a is in the shape of an open groove, and the opening of the limiting groove 231a faces the limiting channel 231b, so that the limiting groove 231a communicates with the limiting channel 231b, and the movement of the limiting piece 251 is facilitated to abut or disengage the cooperating piece 252. The limiting groove 231a serves as a main space for accommodating core components, and the end of the fixing piece 253, the limiting piece 251 and the reset piece 254 are integrated therein, and the groove profile is adapted to the shape of each component. On the one hand, it limits the radial deviation of the end of the fixing piece 253, ensures that the active hole of the fixing piece 253 and the limiting piece 251 are in alignment, and on the other hand, it restricts the movement track of the limiting piece 251, so that the limiting piece 251 can only translate along the direction of approaching / away from the cooperating piece 252, avoiding the disengagement of the cooperating piece 252 and the fixing piece 253 due to transverse misalignment, and at the same time, providing a stable installation reference for the reset piece 254; and the limiting channel 231b connected with the limiting groove 231a specially restricts the cooperating piece 252, and the channel section is adapted to part of the structure of the cooperating piece 252, such as the end of the cooperating piece 252 facing the limiting piece 251, so that the cooperating piece 252 can only move along the extension direction of the limiting channel 231b, ensuring that the cooperating piece 252 can be accurately aligned and abutted with the limiting piece 251 in the limiting groove 231a in the initial state, and maintaining a stable posture when moving with the second ejection plate 221 in the synchronous ejection stage, avoiding premature disengagement or delayed disengagement with the limiting piece 251 due to shaking. In the demolding process, in the initial state, the reset piece 254 in the limiting groove 231a pushes the limiting piece 251 to stably abut the cooperating piece 252 in the limiting channel 231b, and the boundary of the limiting groove 231a and the channel avoids the cooperation deviation of the components due to vibration or slight displacement; when entering the second ejection stroke, the limiting piece 251 is pressed by the fixing piece 253 in the limiting groove 231a to translate away from the cooperating piece 252, and its movement range is strictly limited by the groove body, and at the same time, the cooperating piece 252 moves synchronously with the second ejection plate 221 in the limiting channel 231b, and the channel ensures that it is always on the movement track of the limiting piece 251 until disengagement; after demolding, the reset piece 254 drives the limiting piece 251 to return to the original position in the limiting groove 231a, and the cooperating piece 252 also returns to the original position in the limiting channel 231b, and the two are accurately reconnected.

[0044] Further, in order to ensure that the limiting piece 251 strictly translates in the direction close to / far from the cooperating piece 252, a guide piece is further arranged in the limiting groove 231a. The guide piece is fixed in the limiting groove 231a, and the guide piece is attached to the groove wall close to the first ejection plate 211. The guide piece abuts against the end surface of the limiting piece 251 facing the first ejection plate 211. In this way, the guide piece can limit the movement direction of the limiting piece 251, so that the limiting piece 251 only translates in the direction close to / far from the cooperating piece 252, so as to cooperate with the cooperating piece 252 and the fixing piece 253.

[0045] In an embodiment of the present application, referring to Figure 2 , the side of the first ejection plate 211 away from the movable die core 11 is provided with a jacking post 213, the jacking post 213 penetrates the third ejection plate 231, the second ejection plate 221 has a jacking passage 221a, and the jacking post 213 has a first stroke section exposed in the jacking passage 221a. The jacking passage 221a is configured to insert the top roller 100, and the top roller 100 can abut against the first stroke section.

[0046] In the present embodiment, the top post 213 of the first ejection plate 211, the through structure of the third ejection plate 231, the lifting channel 221a of the second ejection plate 221 and the matching design of the top roller 100, the core is to build a precise power transmission path from "single driving source of the top roller 100 to multi-ejection plate stage movement", to provide a reliable mechanical transmission basis for the orderly execution of the three stages of demolding. From the spatial layout, the top post 213 of the first ejection plate 211 extending away from the movable mold core 11 needs to pass through the third ejection plate 231, and the first stroke segment at the end thereof is exposed in the lifting channel 221a of the second ejection plate 221. This "through structure" not only ensures the coaxiality of the movement of the top post 213, avoids the deviation of the driving force transmission caused by deviation, but also enables the top roller 100 to be directly inserted into the lifting channel 221a from the outside of the second ejection plate 221, so as to accurately abut against the first stroke segment of the top post 213 without crossing other ejection plates, thereby shortening the force transmission path and reducing power loss. In the first ejection stage, the top roller 100 is initially inserted into the lifting channel 221a and only abuts against the first stroke segment of the top post 213 when the first ejection plate 211 moves alone to disconnect the runner 24a. At this time, the pushing force of the top roller 100 is only transmitted to the first ejection plate 211 through the top post 213. Since the length of the first stroke segment is exactly matched with the first ejection stroke, the top roller 100 pushes the top post 213 to drive the first ejection plate 211 to move alone to the disconnected runner 24a and the product 200, while the third ejection plate 231 is only provided for the top post 213 to pass through and is not subjected to the pushing force of the top roller 100. The top roller 100 does not contact the third ejection plate 231 to move the first ejection plate 211, and the second ejection plate 221 and the third ejection plate 231 remain stationary, realizing "single ejection". In the second ejection stage, the first ejection plate 211, the second ejection plate 221 and the third ejection plate 231 move synchronously to separate from the cavity. The top roller 100 continues to penetrate into the lifting channel 221a. When the first stroke segment is completely pushed into the channel, the end of the top post 213 will contact the end face of the third ejection plate 231. At this time, the pushing force of the top roller 100 is transmitted to the first ejection plate 211 and the third ejection plate 231 in turn through the top post 213, and the third ejection plate 231 drives the second ejection plate 221 to move synchronously through the previous limiting cooperation (such as the abutment of the limiting piece 251 and the cooperating piece 252) between the third ejection plate 231 and the second ejection plate 221. The three move in the same direction along the pushing force of the top roller 100, complete the second ejection stroke and make the product 200 separate from the cavity. In addition to the insertion of the top roller 100, the lifting channel 221a also plays a role in stroke limiting and guiding. Its length is matched with the total stroke of the top post 213 to avoid damage to the parts caused by excessive insertion of the top roller 100, and to constrain the movement direction of the top roller 100 and the top post 213, ensuring accurate transmission of the driving force in the ejection direction.The design is driven by a single top roller 100 and cooperates with the stroke of the top column 213-channel, without the need for additional multiple driving sources to realize the phased movement of multiple ejection plates, simplifying the mold driving structure and reducing the cost. At the same time, the power transmission is direct and the stroke is controllable, effectively avoiding the demolding jam or product 200 damage caused by asynchronous driving, and further improving the stability and accuracy of the demolding process.

[0047] In an embodiment of the present application, please refer to Figure 3 The second ejector pin 222 includes 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; wherein the receiving platform 2221 is used to abut the end of the second part 202 of the product 200, and the cladding section 2222 is used to cladding the outer peripheral surface of the second part 202 of the product 200.

[0048] In this embodiment, the combination of the receiving platform 2221 and the cladding section 2222 of the second ejector pin 222 is the core, which is to enhance the constraint and pushing stability of the second part 202 of the product 200 through the composite contact mode of "end face support + outer peripheral cladding". The second part 202 of the product 200 is an elongated column, a thin-walled tube or a part with a protrusion, which is prone to deformation due to uneven stress during demolding. Specifically, the receiving platform 2221 is the basic structure that contacts the end of the second part 202 of the product 200, and its planar design can increase the contact area with the product 200, evenly transmit the ejection force to the end of the product 200, avoid local stress concentration caused by traditional single ejector pin point contact, and prevent the end from being concave or damaged. The cladding section 2222 extends from the surface of the receiving platform 2221 towards the cavity, which forms a radial wrapping constraint on the product 200 through the contour design of the outer peripheral surface of the second part 202 of the product 200. During the second ejection stroke, the receiving platform 2221 provides an axial pushing force to push the product 200 out of the cavity, and at the same time, the cladding section 2222 provides radial support for the product 200 through the outer peripheral cladding, ensuring that the product 200 remains stable in structure during overcoming the holding force of the cavity. When the second ejection stroke is completed, because at least part of the product 200 has been separated from the cavity, the holding force of the cavity on the second part 202 of the product 200 decreases sharply, so during the third ejection stroke, as the first and third ejection plates 231 move the product 200, the cladding constraint of the cladding section 2222 will gradually be released. Because the cladding section 2222 and the outer peripheral surface of the product 200 are adaptively fitted rather than rigidly connected, it can avoid scratching the surface of the product 200 caused by additional friction during separation.

[0049] In an embodiment of the present application, please refer to Figure 2The 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.

[0050] In the embodiment, the fixed bottom plate 26 is arranged on the side of the second ejection plate 221 away from the third ejection plate 231, and serves as a support base of the mold, provides a stable mounting reference for the guide rod 27, bears the driving force applied by the top roller 100 and the reaction force when each ejection plate moves, avoids deformation of the rear structure due to excessive force, and ensures the overall rigidity of the ejection system; and the guide rod 27 fixed on the fixed bottom plate 26 sequentially penetrates the second ejection plate 221, the third ejection plate 231 and the first ejection plate 211, forming a through axial guide path, the penetration parts of the guide rod 27 and each ejection plate are in high-precision sliding fit, such as gap fit or additional guide sleeve, which strictly limits the movement direction of each ejection plate, so that each ejection plate can only translate along the axial direction of the guide rod 27, and completely avoids the misalignment of the ejector pins caused by the inclination and deviation of the ejection plates, such as the deviation of the first ejector pin 212 from the flow channel 24a and the deviation of the second ejector pin 222 / third ejector pin 232 from the corresponding parts of the product 200.

[0051] In the first ejection stage, the guide rod 27 restricts the smooth movement of the first ejection plate 211 along the axial direction, ensuring that the first ejector pin 212 accurately acts on the flow channel 24a; in the second ejection stage, the guide rod 27 ensures synchronous translation along the same axis, avoiding relative inclination caused by uneven force, and uniformly distributing the thrust of the second ejector pin 222 and the third ejector pin 232 on the product 200; in the third ejection stage, the guide rod 27 continues to restrict the movement trajectories of the first ejection plate 211 and the third ejection plate 231, preventing interference with the stationary second ejection plate 221.

[0052] The present application also provides an injection molding equipment, which comprises an injection molding machine and the mold of any one of the above-mentioned embodiments, 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, specifically, the top roller 100 can be inserted into the mold in a downward direction and is in mutual alignment with the ejector pin 213 of the mold, when the injection molding machine drives the top roller 100 to move towards the ejector pin 213, the force of the top roller 100 on the ejector pin 213 can make the first ejection plate 211, the second ejection plate 221 and the third ejection plate 231 move, thereby realizing the demolding of the product 200, and the specific structure of the mold is referred to the above-mentioned embodiments, since the injection molding equipment provided by the present application adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0053] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural changes made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present application.

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.

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