A rotary-pendulum combined core back injection mold

Abstract

The application relates to the technical field of injection molds, and discloses a rotary-pendulum combined core-pulling injection mold, which comprises an upper mold, a lower mold and a mold core arranged on the lower mold, at least one side of the mold core is provided with a lateral sliding mechanism driven by the lifting action of the upper mold, a rotary-pendulum core-pulling mechanism is arranged on the lateral sliding mechanism and rotates around its own axis during movement when approaching or moving away from the mold core, a rotary transmission mechanism is arranged in the mold core and transmissionally cooperates with the rotary-pendulum core-pulling mechanism, a linkage ejection mechanism is arranged below the mold core, and a reset mechanism is arranged on the linkage ejection mechanism; the rotary-pendulum core-pulling mechanism is driven by the lateral sliding mechanism to move and pull out the core, and the rotary-pendulum core-pulling mechanism rotates around its own axis synchronously during the core-pulling process, so that the side part of a finished product is reduced in scratches and stuck, meanwhile, the rotary of the rotary-pendulum core-pulling mechanism drives the rotary transmission mechanism to move, the linkage ejection mechanism is used for ejecting the finished product after the core-pulling, mechanical linkage of rotary core-pulling and auxiliary ejection is realized, and the demolding stability of the finished product is improved.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, specifically to a rotary composite core-removing injection mold. Background Technology

[0002] When injection molds are used to mold plastic products with side holes, side rib grooves, irregular internal cavities, or partial undercut structures, lateral core-removing structures are usually required on both sides of the mold core. Existing core-removing molds mostly use the lifting and lowering of the upper mold to move the slide block, allowing the core-pulling rod to insert or withdraw from the side molding area of ​​the finished product in a straight line, thus completing the lateral core-pulling. However, for finished products with eccentric surfaces, curved surfaces, or partial undercut surfaces in the side molding area, simply relying on the core-pulling rod to withdraw in a straight line can easily cause the core-pulling rod to scrape, get stuck, or be partially pulled against the inner wall of the finished product, resulting in deformation of the side holes, scratches on the inner wall, and whitening of the edges. In severe cases, it can even cause the finished product to remain on the mold core, affecting the stability of continuous injection molding.

[0003] Meanwhile, in existing molds, the core removal and blanking actions are mostly independent of each other. After the core-pulling rod completes the core removal, the finished product still needs to be blanked using conventional ejector pins or ejector plates. When the finished product has cooling shrinkage clamping force on the mold core surface, or when the finished product's side hole is partially attached due to core pulling, ordinary ejection structures are prone to problems such as delayed ejection timing, uneven ejection force, product tilting, or local whitening.

[0004] Adding a separate cylinder, hydraulic cylinder, or electric mechanism to drive the auxiliary ejector structure would increase the complexity of the mold structure, the assembly space requirements, and the difficulty of synchronous control of the movements, which would be detrimental to the miniaturization and stable operation of the mold. Summary of the Invention

[0005] The purpose of this application is to provide a rotary composite core-removing injection mold to solve the problems of existing lateral core-removing molds, which easily cause scratches on the inner wall of the finished product, whitening of the side holes, and local deformation when the core-pulling rod retracts linearly when molding finished products with side holes, irregular internal cavities, or local undercut areas. At the same time, it solves the problems of the core-removing action and the material unloading action being independent of each other, resulting in unstable material unloading, uneven ejection force, and the space occupied by the additional material unloading drive structure.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] This application provides a rotary composite core-removing injection mold, including an upper mold, a lower mold, and a core disposed on the lower mold. At least one side of the core is provided with a lateral sliding mechanism driven by the lifting action of the upper mold to move closer to or away from the core. The side of the lateral sliding mechanism close to the core is provided with a rotary core-pulling mechanism that can move closer to or away from the core with the lateral sliding mechanism and rotate around its own axis during the process of moving closer to or away from the core. A rotary transmission mechanism that is driven and cooperates with the rotary core-pulling mechanism is provided inside the core. A linkage ejector mechanism for lifting the finished product is provided below the core. The rotary transmission mechanism is used to transmit the rotation of the rotary core-pulling mechanism as a pressing action on the linkage ejector mechanism when the rotary core-pulling mechanism moves away from the core and rotates around its own axis. A reset mechanism for resetting the linkage ejector mechanism is provided on the linkage ejector mechanism. With this structure, the swivel core-pulling mechanism can generate a rotational avoidance action around its own axis while completing the lateral core removal. It can also use this rotational action to drive the linkage ejector mechanism to lift the finished product, so that core pulling, rotational avoidance and auxiliary unloading form a continuous mechanical linkage, reducing the number of independent drive structures and improving the synchronization of mold actions.

[0008] Furthermore, the lateral sliding mechanism includes a slide block, which is slidably mounted on the lower mold and located on one side of the mold core. An inclined channel is formed on the slide block, and a guide post is fixedly mounted at the bottom of the upper mold, engaging with the inclined channel. When the guide post moves downward with the upper mold and inserts into the inclined channel, it pushes the slide block closer to the mold core. When the guide post moves upward with the upper mold, it engages with the inclined channel and moves the slide block away from the mold core. Through the cooperation of the guide post and the inclined channel, the lifting action of the upper mold can be directly converted into the lateral reciprocating movement of the slide block, eliminating the need for additional lateral drive components and making the mold closing and core insertion and mold opening / retraction actions more stable.

[0009] Furthermore, the rotary core-pulling mechanism includes a core-pulling rod, which is rotatably mounted on the side of the slide block near the mold core. A spiral arc-shaped groove is formed on the outer wall of the core-pulling rod. A vertical rod is fixedly mounted on the lower mold or mold core and located between the mold core and the slide block. A ball bearing is mounted at the top of the vertical rod, remaining fixed relative to the mold core and extending into the spiral arc-shaped groove. When the slide block moves, the core-pulling rod rotates around its own axis through the cooperation of the ball bearing and the spiral arc-shaped groove. Through the cooperation of the spiral arc-shaped groove and the ball bearing, the linear movement of the slide block is converted into the rotational motion of the core-pulling rod, allowing the core-pulling rod to rotate synchronously around its own axis as it approaches or moves away from the mold core, thereby reducing the hard friction between the core-pulling rod and the side molding area of ​​the finished product.

[0010] Furthermore, the end of the core-pulling rod closest to the mold core can be inserted into the mold core. This end forms the core-pulling molding area on the side of the finished product. The core-pulling rod can retract from the side of the finished product when the slide moves away from the mold core. By shaping the side area of ​​the finished product with the core-pulling rod and retracting it as the slide moves away from the mold core during mold opening, the core removal of side holes, side grooves, or irregularly shaped side areas of the finished product can be completed. At the same time, the rotation of the core-pulling rod reduces the risk of damage to the side of the finished product.

[0011] Furthermore, the rotary transmission mechanism includes a cam rotatably mounted inside the mold core. A circular groove is formed at the center of the cam for the core-pulling rod to pass through. Multiple limiting blocks are fixedly mounted on the outer wall of the core-pulling rod. A slot is formed on the inner wall of the circular groove to cooperate with the limiting blocks. The slot extends along the moving direction of the core-pulling rod, and the limiting blocks can slide within the slot along the moving direction of the core-pulling rod. When the core-pulling rod rotates, it can drive the cam to rotate through the cooperation of the limiting blocks and the slot. The limiting blocks and the slot form a sliding torque transmission structure, allowing the core-pulling rod to slide relative to the cam during horizontal movement. Simultaneously, when it rotates, it drives the cam to rotate synchronously, thus preventing the cam from obstructing the core-pulling rod's retraction and reliably transmitting the rotary driving force.

[0012] Furthermore, the outer periphery of the cam is sequentially provided with a clearance section, a transition section, and a pressing section along the rotation direction. The clearance section is used to be opposite to the linked ejector mechanism in the mold-closed state without applying pressing force to the linked ejector mechanism. The pressing section is used to press the linked ejector mechanism to move during the mold opening and core removal process. By forming a delayed pressing path through the clearance section, the transition section, and the pressing section, the linked ejector mechanism can be kept in the reset position during mold closing and injection molding. The linked ejector mechanism is only driven to move after the core-pulling rod has been removed to the predetermined position, thus preventing the finished product from being prematurely ejected before the core is completely removed.

[0013] Furthermore, the linkage ejection mechanism includes a movable groove located below the mold core, within which a lifting plate is movably mounted. Multiple lifting rods are fixedly mounted on the lifting plate, passing upwards through the mold core to lift the finished product. By having the lifting plate drive multiple lifting rods to move upwards synchronously, multi-point lifting support can be formed at the bottom of the finished product, reducing localized stress concentration caused by single-point ejection and improving the stability of the finished product during unloading.

[0014] Furthermore, the linkage ejection mechanism also includes an extrusion plate that engages with the outer periphery of the cam. A linkage rod is hinged to the bottom of the extrusion plate, and the middle of the linkage rod is rotatably mounted in the lower die or die core via a rotating shaft. A connecting rod is hinged to the end of the linkage rod away from the extrusion plate, and the end of the connecting rod away from the linkage rod is hinged to the bottom of the lifting plate. The extrusion plate, linkage rod, and connecting rod form a lever-type transmission path. When the cam rotates, it can transmit pressure to the linkage rod through the extrusion plate, and then convert it into the upward movement of the lifting plate through the connecting rod, so that the rotational motion can stably drive the lifting motion.

[0015] Furthermore, when the cam rotates to the point where it contacts the extrusion plate, the extrusion plate can move downwards and drive the linkage rod to rotate around the shaft. The end of the linkage rod away from the extrusion plate can push the lifting plate upwards through the connecting rod. Through this lever reverse transmission method, the downward pressure applied by the cam to the extrusion plate can be converted into the upward movement of the lifting plate, so that the core-pulling rod's core-removing rotation process directly triggers the finished product lifting action, achieving synchronous auxiliary unloading after core removal is completed.

[0016] Furthermore, the reset mechanism includes a reset spring, which is sleeved on the outside of the lifting rod. One end of the reset spring abuts against the top of the moving groove, and the other end abuts against the lifting plate. The reset spring is used to drive the lifting plate and lifting rod to reset after the cam releases its pressure on the linkage ejector mechanism. The reset spring allows the lifting plate and lifting rod to retract into the mold core during mold closing and reset, preventing the lifting rod from protruding and affecting the next injection molding, while ensuring the linkage ejector mechanism can operate repeatedly and stably.

[0017] The technical solution provided in this application has the following advantages compared with the prior art:

[0018] This application utilizes a lateral sliding mechanism to drive a gyratory core-pulling mechanism closer to or further away from the mold core. Furthermore, the ball bearings at the top of the vertical rod engage with the spiral arc groove on the outer wall of the core-pulling rod, enabling the gyratory core-pulling mechanism to rotate synchronously around its own axis during horizontal movement. Consequently, when exiting the side molding area of ​​the finished product, the gyratory core-pulling mechanism can rotate to avoid contact, rather than simply forcibly exiting along a straight line. This reduces scratching and jamming between the finished product's side holes, irregularly shaped cavities, or partially undercut areas and the gyratory core-pulling mechanism, lowering the probability of scratches on the inner wall of the finished product, whitening of side holes, and edge deformation, thus improving the stability of the core-pulling process.

[0019] This application utilizes a gyratory core-pulling mechanism to drive a rotary transmission mechanism inside the mold core, which in turn drives a linked ejector mechanism. This transforms the gyratory core-pulling mechanism's core-removal action into a finished product ejection action. This structure creates a synchronized mechanical linkage between core removal and ejection, enabling the finished product to be ejected promptly after the gyratory core-pulling mechanism exits the side of the finished product. This alleviates demolding difficulties caused by the finished product shrinking and sticking due to cooling, reducing problems such as ejection misalignment, localized whitening, and unstable ejection when using ordinary ejector pins alone. Furthermore, it eliminates the need for additional independent cylinders, hydraulic cylinders, or electric ejector mechanisms, resulting in a compact structure and good synchronization of actions. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the upper and lower molds in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the upper mold structure in an embodiment of this application;

[0023] Figure 3This is a schematic diagram of the lower mold structure in an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structure of the mold core and the lateral sliding mechanism in the embodiments of this application;

[0025] Figure 5 This is a schematic diagram of the mold core structure in the embodiments of this application;

[0026] Figure 6 This is a schematic diagram of the swing core-pulling mechanism in the embodiments of this application;

[0027] Figure 7 This is a schematic diagram of the cam structure in an embodiment of this application;

[0028] Figure 8 This is a schematic diagram of the cam lifting linkage material ejection mechanism in the embodiments of this application;

[0029] Figure 9 This is a schematic diagram of the cam avoidance linkage top material mechanism in the embodiments of this application.

[0030] Explanation of icon numbers:

[0031] 1. Upper mold; 11. Guide pillars;

[0032] 2. Lower mold;

[0033] 3. Mold core;

[0034] 4. Lateral sliding mechanism; 41. Slide block; 42. Inclined channel;

[0035] 5. Swinging core-pulling mechanism; 51. Core-pulling rod; 52. Spiral arc groove; 53. Vertical rod; 54. Ball bearing;

[0036] 6. Rotary transmission mechanism; 61. Cam; 611. Avoidance section; 612. Transition section; 613. Pressing section; 62. Circular groove; 63. Limiting block; 64. Slot;

[0037] 7. Linked feeding mechanism; 71. Moving trough; 72. Lifting plate; 73. Lifting rod; 74. Extrusion plate; 75. Linkage rod; 76. Rotating shaft; 77. Connecting rod;

[0038] 8. Reset mechanism; 81. Reset spring. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0040] The present application will be further described below with reference to embodiments.

[0041] Example 1:

[0042] Reference Figure 1 - Figure 9 This first embodiment of the present application provides a rotary composite core-removing injection mold. This injection mold is used for molding plastic products with side holes, side rib grooves, eccentric side grooves, irregularly shaped side cavities, or partially undercut areas. It is particularly suitable for injection molding scenarios where the sides of the finished product require core-pulling molding and are prone to side hole damage, sidewall whitening, localized sticking, or unstable material feeding during demolding. The rotary composite core-removing injection mold includes an upper mold 1, a lower mold 2, and a mold core 3 disposed at the center of the lower mold 2. The upper mold 1 can move up and down relative to the lower mold 2. After the upper mold 1 and lower mold 2 are closed, the mold core 3 forms a molding cavity for the injection-molded finished product between the upper mold 1 and the lower mold 2. The mold core 3 can be made of P20, 718H, S136 or H13 mold steel. The surface of the mold core 3 is polished, nitrided or hard chrome plated according to the finished product material and appearance requirements. Preferably, the surface roughness of the mold core 3 is Ra0.2μm to Ra0.8μm to reduce the clamping and adhesion of the injection molded product to the mold core 3 after cooling.

[0043] A lateral sliding mechanism 4 is provided on at least one side of the mold core 3 on the lower mold 2. In this embodiment, the lateral sliding mechanism 4 is configured as two sets and symmetrically arranged along the center line of the mold core 3. When the finished product has a lateral hole, lateral rib groove, eccentric side groove, irregular side cavity or partial undercut area on only one side, it can also be configured as a single-sided arrangement according to the side structure of the finished product. The lateral sliding mechanism 4 includes a slide block 41, which is slidably disposed on the lower mold 2. The slide block 41 can move horizontally in the direction of approaching or moving away from the mold core 3.

[0044] The lower mold 2 can have a groove for the slide block 41 to move. The bottom of the slide block 41 and the groove are in clearance fit or guide rail fit. Preferably, the clearance on one side between the slide block 41 and the groove is 0.02mm to 0.08mm to ensure that the slide block 41 can move stably and to avoid significant shaking of the slide block 41 during injection molding. The slide block 41 has an inclined channel 42, which is inclined along the lifting direction of the upper mold 1. A guide post 11 is fixedly provided at the bottom of the upper mold 1. The guide post 11 is correspondingly provided with the inclined channel 42 and can be inserted into the inclined channel 42 when the upper mold 1 moves down. The inclination angle of the inclined channel 42 is preferably 10° to 25°, more preferably 15° to 18°. This angle can stably convert the vertical movement of the upper mold 1 into the lateral movement of the slide block 41, and can also avoid excessive lateral impact force between the guide post 11 and the inclined channel 42.

[0045] The lateral travel of the slide block 41 is determined according to the core-pulling depth of the finished product side, preferably 8mm to 25mm. When the core-pulling depth of the finished product side is small, the travel of the slide block 41 can be 8mm to 12mm. When the finished product side is undercut or the side groove is deep, the travel of the slide block 41 can be 15mm to 25mm.

[0046] The inclined channel 42 has two opposing guide walls. One guide wall is used to receive the push of the guide post 11 when the upper mold 1 moves down, so that the slide 41 moves towards the mold core 3. The other guide wall is used to cooperate with the guide post 11 when the upper mold 1 moves up, so that the slide 41 moves away from the mold core 3 and resets.

[0047] To improve motion stability, the end of the guide post 11 can be set as a rounded end or a rolling end, and a chamfer is provided at the entrance of the inclined channel 42, with a chamfer angle of 30° to 60°, so that the guide post 11 can smoothly enter the inclined channel 42. In the mold closed state, the guide post 11 is fully inserted into the inclined channel 42, and the slide 41 moves to a position close to the mold core 3. In the mold open state, the guide post 11 gradually withdraws from the inclined channel 42, and the slide 41 moves away from the mold core 3 as the guide post 11 and the inclined channel 42 cooperate.

[0048] A rotary core-pulling mechanism 5 is provided on the side of the slide block 41 near the mold core 3. The rotary core-pulling mechanism 5 includes a core-pulling rod 51, which is rotatably mounted on the side of the slide block 41 near the mold core 3. Specifically, a mounting hole can be opened on the side of the slide block 41 near the mold core 3, and a wear-resistant sleeve, a copper sleeve, or a rolling bearing is installed in the mounting hole. The core-pulling rod 51 passes through the wear-resistant sleeve, copper sleeve, or rolling bearing and is connected to the slide block 41, so that the core-pulling rod 51 can rotate around its own axis and move closer to or further away from the mold core 3 along with the slide block 41. The axis of the core-pulling rod 51 is parallel or substantially parallel to the moving direction of the slide block 41, and the end of the core-pulling rod 51 near the mold core 3 can be inserted into the mold core 3 to form the core-pulling forming area on the side of the finished product.

[0049] The forming end of the core-pulling rod 51 can be configured as a cylindrical, flat tongue, eccentric boss, partially raised rib, or irregular structure with an arc transition, depending on the side structure of the finished product. When the side of the finished product is a regular round hole, the forming end of the core-pulling rod 51 can be cylindrical. When the side of the finished product is a non-circular groove or eccentric groove, the forming end of the core-pulling rod 51 can be flat tongue or eccentric boss. The outer diameter or width of the forming end of the core-pulling rod 51 is determined according to the size of the hole or groove on the side of the finished product. Preferably, a sliding fit clearance of 0.01mm to 0.05mm is reserved between the forming end of the core-pulling rod 51 and the corresponding core-pulling hole in the mold core 3 through which the core-pulling rod 51 passes, to ensure smooth movement and rotation of the core-pulling rod 51 relative to the mold core 3, while ensuring the forming size of the hole or groove on the side of the finished product.

[0050] The outer wall of the core-pulling rod 51 is provided with a spiral arc groove 52. The spiral arc groove 52 extends along the axial direction of the core-pulling rod 51 and forms a spiral path around the core-pulling rod 51. The groove width of the spiral arc groove 52 corresponds to the diameter of the ball 54. Preferably, the groove width of the spiral arc groove 52 is 0.05mm to 0.20mm larger than the diameter of the ball 54 to ensure that the ball 54 can roll or slide in the spiral arc groove 52, while avoiding excessive gaps that cause the rotation angle of the core-pulling rod 51 to be unstable.

[0051] The lead of the spiral arc groove 52 is determined according to the moving stroke of the slide 41 and the required rotation angle of the core-pulling rod 51. Preferably, when the slide 41 completes a moving stroke of 8mm to 25mm, the core-pulling rod 51 can rotate 20° to 70°, more preferably 35° to 50°. For irregular side holes or partial undercut structures, the rotation angle of the core-pulling rod 51 is preferably 45°, so that the forming end of the core-pulling rod 51 moves from the undercut obstruction position to the avoidance position during the core removal process, reducing hard scratches with the side wall of the finished product.

[0052] The vertical rod 53 is fixedly mounted on the lower mold 2 or the mold core 3, located between the mold core 3 and the slide block 41. The vertical rod 53 is arranged vertically, and a ball bearing 54 is provided at the top of the vertical rod 53. The ball bearing 54 extends into the spiral arc groove 52. The ball bearing 54 can be directly set in the ball socket at the top of the vertical rod 53, or it can be installed at the top of the vertical rod 53 through a small roller structure. The ball bearing 54 is preferably made of bearing steel, stainless steel, or hard alloy material, and its diameter can be 3mm to 8mm. When the slide block 41 approaches or moves away from the mold core 3, the core-pulling rod 51 moves horizontally with the slide block 41, while the vertical rod 53 and the ball bearing 54 remain fixed relative to the mold core 3. Therefore, the ball bearing 54 moves relative to the spiral arc groove 52, and the oblique guiding effect of the spiral arc groove 52 forces the core-pulling rod 51 to rotate around its own axis. Thus, the horizontal core-pulling action and the rotational avoidance action of the core-pulling rod 51 can be achieved synchronously through the movement of the same slide block 41, without the need for an additional rotary cylinder or rotary motor.

[0053] The mold core 3 is equipped with a rotary transmission mechanism 6, which includes a cam 61 rotatably mounted inside the mold core 3. A cam mounting cavity can be formed inside the mold core 3, and the cam 61 is located in the cam mounting cavity. The cam 61 can rotate around the axis of the core-pulling rod 51. A circular groove 62 is formed at the center of the cam 61, and the end of the core-pulling rod 51 near the mold core 3 passes through the circular groove 62. A plurality of limiting blocks 63 are fixedly provided on the outer wall of the core-pulling rod 51, and the multiple limiting blocks 63 are evenly spaced along the circumference of the core-pulling rod 51. The number of limiting blocks 63 is preferably 3 to 6, more preferably 4. The limiting blocks 63 can be integrally formed with the core-pulling rod 51, or they can be fixed to the outer wall of the core-pulling rod 51 by key connection, welding or screw fixing.

[0054] The inner wall of the circular groove 62 is provided with a slot 64 that matches the limiting block 63. The slot 64 extends along the moving direction of the core-pulling rod 51. The limiting block 63 can slide along the axial direction of the core-pulling rod 51 in the slot 64, and at the same time, it abuts against the side wall of the slot 64 when the core-pulling rod 51 rotates, thereby driving the cam 61 to rotate synchronously.

[0055] The limiting block 63 and the slot 64 form a sliding torque transmission structure. This structure functions as follows: when the core-pulling rod 51 moves horizontally, the limiting block 63 can slide axially within the slot 64, preventing the cam 61 from obstructing the core-pulling rod 51 from inserting into or exiting the mold core 3. When the core-pulling rod 51 rotates, the limiting block 63 can transmit torque to the cam 61 through the side wall of the slot 64, causing the cam 61 to rotate with the core-pulling rod 51. To ensure that the core-pulling rod 51 can always drive the cam 61 to rotate before completing the effective core-removal stroke, the axial length of the slot 64 should be greater than the horizontal travel required for the core-pulling rod 51 to drive the cam 61 to rotate. Preferably, the axial length of the slot 64 is 1.1 to 1.5 times the effective core-removal stroke of the core-pulling rod 51.

[0056] For example, when the effective retraction stroke of the core-pulling rod 51 is 12mm, the axial length of the slot 64 can be set to 14mm to 18mm. The radial fit clearance between the limiting block 63 and the slot 64 is preferably 0.03mm to 0.12mm, which can ensure reliable transmission and avoid jamming caused by injection dust or lubricating oil film.

[0057] The outer periphery of the cam 61 is provided with a clearance section 611, a transition section 612, and a pressing section 613 in sequence along the rotation direction. The clearance section 611 is a low-radius arc surface, the transition section 612 is a transition arc surface with a gradually increasing radius, and the pressing section 613 is a high-radius arc surface or a pressing protrusion.

[0058] In the mold-closed injection state, the clearance section 611 is opposite to the linkage ejector mechanism 7 and does not apply top pressure to the linkage ejector mechanism 7, keeping the ejector rod 73 in a retracted state and not affecting the molding of the finished product. In the initial stage of mold opening and core removal, the core-pulling rod 51 rotates in the opposite direction and drives the cam 61 to rotate. At this time, the cam 61 first passes through the clearance section 611 and the transition section 612, and the linkage ejector mechanism 7 does not immediately lift the finished product or is only in an un-ejected state. After the core-pulling rod 51 exits the critical interference area of ​​the undercut or side hole groove on the side of the finished product, the top pressure section 613 gradually rotates to the top of the linkage ejector mechanism 7 and applies top pressure, causing the linkage ejector mechanism 7 to move. The delay angle corresponding to the clearance section 611 is preferably 15° to 35°, more preferably 20° to 30°. This delay angle can ensure that the ejector rod 73 will not lift the finished product prematurely before the core-pulling rod 51 exits the side of the finished product, avoiding the finished product being pulled white or cracked.

[0059] A linkage ejector mechanism 7 is provided below the mold core 3. The linkage ejector mechanism 7 includes a movable groove 71 formed below the mold core 3, and a lifting plate 72 is movably disposed within the movable groove 71. The lifting plate 72 can be a rectangular plate, a long strip plate, or an irregularly shaped plate adapted to the bottom contour of the finished product. A guide gap is reserved between the lifting plate 72 and the side wall of the movable groove 71. Preferably, the guide gap on one side is 0.03mm to 0.10mm to ensure that the lifting plate 72 can rise and fall smoothly without significant tilting. Multiple lifting rods 73 are fixedly disposed on the lifting plate 72. The lifting rods 73 pass upward through the mold core 3 and are used to lift the finished product.

[0060] The upper end of the lifting rod 73 is preferably located at a stress support position corresponding to a non-visible surface of the finished product's bottom, below the reinforcing rib, or near the lateral core-pulling area, to avoid directly pressing on the finished product's visible surface. The upper end of the lifting rod 73 can be set as a flat end, an arc end, or a chamfered end, with a chamfer radius of 0.3mm to 1.0mm to reduce indentations on the bottom of the finished product during ejection.

[0061] The spacing between the multiple lifting rods 73 can be set according to the finished product size, preferably 15mm to 60mm, to form a uniform lifting support. The lifting stroke of the lifting rods 73 can be 3mm to 12mm, more preferably 5mm to 8mm. When this structure is only used as an auxiliary unloading mechanism, the lifting stroke of the lifting rods 73 can be 3mm to 5mm. When this structure is used together with a conventional ejection mechanism to complete the unloading, the lifting stroke of the lifting rods 73 can be 6mm to 10mm.

[0062] The linkage ejector mechanism 7 also includes an extrusion plate 74 that drives the outer periphery of the cam 61. In the assembled state, the pressure-bearing surface of the extrusion plate 74 is positioned opposite to the outer periphery of the cam 61 to bear the top pressure generated during the rotation of the cam 61. The extrusion plate 74 is movably disposed inside the mold core 3 and its movement along the pressure direction is restricted by a guide structure, so that when the cam 61 rotates to the top pressure section 613, it can push the extrusion plate 74 to move.

[0063] A linkage rod 75 is hinged below the extrusion plate 74. The middle part of the linkage rod 75 is rotatably mounted in the lower mold 2 or mold core 3 via a rotating shaft 76. A connecting rod 77 is hinged to the end of the linkage rod 75 away from the extrusion plate 74, and the end of the connecting rod 77 away from the linkage rod 75 is hinged to the bottom of the lifting plate 72. The position of the rotating shaft 76 is preferably close to the middle of the linkage rod 75, but it can also be offset according to the required lifting force and lifting stroke. To increase the lifting force, the distance from the end of the linkage rod 75 near the extrusion plate 74 to the rotating shaft 76 can be set to 0.6 to 0.9 times the distance from the end of the linkage rod 75 away from the extrusion plate 74 to the rotating shaft 76. To increase the lifting stroke, the distance from the end of the linkage rod 75 near the extrusion plate 74 to the rotating shaft 76 can also be set to 1.1 to 1.5 times the distance from the end of the linkage rod 75 away from the extrusion plate 74. In actual use, the appropriate ratio can be selected according to the weight of the finished product, the demolding resistance, and the mold space.

[0064] When the cam 61 rotates to the point where the top pressure section 613 contacts the extrusion plate 74, the top pressure section 613 presses down on the extrusion plate 74, causing the extrusion plate 74 to move downward and drive one end of the linkage rod 75 to move downward. Since the middle of the linkage rod 75 is rotatably set through the rotating shaft 76, the end of the linkage rod 75 away from the extrusion plate 74 will swing upward and push the lifting plate 72 upward through the connecting rod 77. The lifting plate 72 then drives multiple lifting rods 73 to move upward synchronously, thereby lifting the finished product from the mold core 3.

[0065] Therefore, the rotational motion of the cam 61 can be converted into the vertical lifting motion of the lifting rod 73 through the extrusion plate 74, linkage rod 75, rotating shaft 76, connecting rod 77 and lifting plate 72, realizing the mechanical linkage between the rotation of the core-pulling rod 51 to remove the core and the unloading of the finished product.

[0066] The linkage top-feeding mechanism 7 is equipped with a reset mechanism 8, which includes a reset spring 81. The reset spring 81 is sleeved on the outside of the lifting rod 73. One end of the reset spring 81 abuts against the top of the moving groove 71, and the other end of the reset spring 81 abuts against the lifting plate 72. The reset spring 81 is preferably a compression spring. The spring preload can be 0.5mm to 2mm, and the spring working compression can be 3mm to 10mm. The spring stiffness can be determined according to the weight of the lifting plate 72, the lifting rod 73, and the ejection resistance, and is preferably 5N / mm to 30N / mm.

[0067] When the mold is opened and the material is ejected, the lifting plate 72 moves upward and compresses the return spring 81. When the mold is closed and reset, after the pressing section 613 of the cam 61 leaves the extrusion plate 74, the return spring 81 releases its elastic force, pushing the lifting plate 72 and the lifting rod 73 downward to reset, so that the lifting rod 73 retracts into the mold core 3. In order to ensure that the retraction of the lifting rod 73 does not affect the next injection molding, the upper end of the lifting rod 73 should not be higher than the molding surface of the mold core 3 in the reset state. Preferably, the upper end of the lifting rod 73 is sunk 0.01mm to 0.05mm relative to the molding surface of the mold core 3.

[0068] The working process of this embodiment is as follows:

[0069] Before mold closing, slide 41 is located away from mold core 3, the forming end of core-pulling rod 51 is not fully inserted into the corresponding forming position of mold core 3, cam 61 is in the top-pressing state or intermediate state after mold opening, and lifting plate 72 and lifting rod 73 can maintain the retraction tendency under the action of return spring 81. When upper mold 1 begins to move down, guide post 11 enters the inclined channel 42 on slide 41. Guide post 11 applies lateral force along the side wall of inclined channel 42, causing slide 41 to move towards mold core 3. During the movement of slide 41, core-pulling rod 51 moves synchronously with slide 41 towards mold core 3. The end of core-pulling rod 51 close to mold core 3 is gradually inserted into the core-pulling forming position inside mold core 3.

[0070] Meanwhile, the ball bearing 54 at the top of the vertical rod 53 is located in the spiral arc groove 52 on the outer wall of the core-pulling rod 51. Since the vertical rod 53 is fixed relative to the mold core 3, the core-pulling rod 51 rotates around its own axis under the guidance of the ball bearing 54 and the spiral arc groove 52 when it moves horizontally. During the rotation of the core-pulling rod 51, the limiting block 63 transmits torque in the slot 64, causing the cam 61 to rotate synchronously. When the mold is closed, the cam 61 rotates to the position where the clearance section 611 faces the extrusion plate 74. The extrusion plate 74 is no longer subjected to top pressure, and the lifting plate 72 and the lifting rod 73 retract under the action of the return spring 81. The forming end of the core-pulling rod 51 is stably in the forming position, and then molten plastic is injected into the forming cavity and pressure is maintained and cooled.

[0071] After injection molding is completed, the upper mold 1 begins to move upward, the guide post 11 moves in the opposite direction along the inclined channel 42, and the slide 41 gradually moves away from the mold core 3 under the cooperation of the guide post 11 and the inclined channel 42. When the slide 41 moves away from the mold core 3, the core pull rod 51 moves outward from the side molding area of ​​the finished product along with the slide 41. At the same time, the core pull rod 51 continues to rotate in the opposite direction under the cooperation of the ball 54 and the spiral arc groove 52. The reverse rotation of the core pull rod 51 can make its molding end turn from the interference position of the partial undercut or irregular hole groove on the side of the finished product to the avoidance position, thereby reducing the risk of the core pull rod 51 directly pulling the side wall of the finished product.

[0072] In the initial stage of mold opening, the cam 61 rotates with the core-pulling rod 51, but the avoidance section 611 and the transition section 612 are opposite to the extrusion plate 74 one after the other, and the lifting rod 73 remains retracted or only in the un-ejected state, so that the core-pulling rod 51 can complete the key core-removal stroke first.

[0073] After the core-pulling rod 51 exits the main interference area on the side of the finished product, the pressing section 613 of the cam 61 gradually contacts the extrusion plate 74 and presses down the extrusion plate 74. The extrusion plate 74 moves down and drives the linkage rod 75 to rotate around the rotating shaft 76. The end of the linkage rod 75 away from the extrusion plate 74 swings upward and pushes the lifting plate 72 upward through the connecting rod 77. The lifting plate 72 drives multiple lifting rods 73 to extend upward. The lifting rods 73 lift the bottom of the finished product, thereby realizing the unloading of the finished product.

[0074] After the product is removed, the upper mold 1 moves down again for the next mold closing. The cam 61 rotates back to the avoidance state, and the reset spring 81 pushes the lifting plate 72 and the lifting rod 73 to reset, preparing for the next injection molding.

[0075] The working principle of this embodiment is as follows:

[0076] The lifting motion of the upper mold 1 is converted into the lateral movement of the slide block 41 through the guide post 11 and the inclined channel 42. The lateral movement of the slide block 41 is converted into the rotation of the core-pulling rod 51 through the ball bearing 54 and the spiral arc groove 52. The rotation of the core-pulling rod 51 is then transmitted to the cam 61 through the limit block 63 and the slot 64. The rotation of the cam 61 is converted into the upward movement of the lifting plate 72 through the extrusion plate 74, the linkage rod 75 and the connecting rod 77.

[0077] Thus, without adding independent cylinders, hydraulic cylinders or electric ejection mechanisms, the mold enables lateral core removal, rotation avoidance and auxiliary ejection to form a continuous linkage.

[0078] Example 2:

[0079] Reference Figure 8 - Figure 9This is the second embodiment of the present application. Based on Embodiment 1, this embodiment further describes the simultaneous double-sided core removal, delayed ejection, and lifting stability. In this embodiment, a lateral sliding mechanism 4 and a swivel core-pulling mechanism 5 are provided on both sides of the mold core 3. The two side slides 41 are located on the left and right sides of the mold core 3, respectively. An inclined channel 42 is provided on each side slide 41. Two guide pillars 11 are correspondingly provided at the bottom of the upper mold 1. The inclination directions of the two guide pillars 11 are opposite, so that when the upper mold 1 moves downward, the two guide pillars 11 can push the two side slides 41 synchronously towards the mold core 3. When the upper mold 1 moves upward, the two guide pillars 11 can drive the two side slides 41 synchronously away from the mold core 3. The travel of the two slides 41 is preferably consistent, with a travel error of no more than 0.2 mm, to ensure that the core-pulling rods 51 on both sides are inserted or withdrawn synchronously, avoiding unbalanced lateral forces on the finished product during mold closing and opening.

[0080] In this embodiment, the outer walls of both core-pulling rods 51 are provided with spiral arc-shaped grooves 52. The ball bearings 54 at the top of the two vertical rods 53 are respectively located in the corresponding spiral arc-shaped grooves 52. The spiral arc-shaped grooves 52 on both sides can rotate in opposite directions, so that the two core-pulling rods 51 rotate in opposite directions when moving towards the mold core 3. Alternatively, they can be set to rotate in the same direction according to the side structure of the finished product. When the finished product has symmetrical undercuts or symmetrical irregular side holes on both sides, it is preferable to set the two core-pulling rods 51 to rotate in opposite directions so that the rotational core-removal action on both sides of the finished product is balanced. The rotation angle of both core-pulling rods 51 during the mold closing and core insertion process is preferably 35° to 50°. When opening the mold and removing the core, they rotate in opposite directions by the same angle, thereby ensuring that the forming end of the core-pulling rod 51 can stably exit from the interference area on the side of the finished product.

[0081] In this embodiment, cams 61 can be respectively provided in the mold core 3 corresponding to the two core-pulling rods 51. The two cams 61 are respectively connected by the limiting block 63 on the corresponding core-pulling rod 51 and the slot 64 in the circular groove 62 of the corresponding cam 61. The two cams 61 can act on the same extrusion plate 74 together, or they can act on the two ends of the extrusion plate 74 respectively. When the two cams 61 act on the same extrusion plate 74 together, the extrusion plate 74 preferably extends along the width direction of the mold core 3, so that the top pressing section 613 of the two cams 61 can press down on the two ends of the extrusion plate 74 simultaneously or sequentially. In order to avoid the extrusion plate 74 tilting due to pressure on one side, the angle of the top pressing section 613 of the two cams 61 should be consistent. It is preferable that the two cams 61 enter the top pressing state simultaneously during the mold opening and core removal process. When the mold sticking is more serious on one side of the finished product, the cam 61 closer to the sticking side can also enter the top pressing state first, so that the lifting rod 73 on that side can perform slight pre-lifting first, and then the other side can lift synchronously, thereby adapting to different finished product structures.

[0082] To further improve the delayed feeding effect, in this embodiment, the angle of the avoidance section 611 on the outer periphery of the cam 61 can be set to 20° to 30°, the angle of the transition section 612 can be set to 10° to 20°, and the angle of the pressing section 613 can be set to 20° to 40°.

[0083] In the initial stage of mold opening, when the withdrawal distance of the core-pulling rod 51 is less than 40% of its effective core-removal stroke, the cam 61 remains opposite the extrusion plate 74 with the avoidance section 611 or the transition section 612, and the lifting rod 73 does not lift the finished product. When the withdrawal distance of the core-pulling rod 51 reaches 50% to 70% of its effective core-removal stroke, the pressing section 613 begins to contact the extrusion plate 74 and drives the lifting rod 73 to perform a small stroke pre-lift. The pre-lift stroke can be 0.5mm to 1.5mm, which is used to break the initial adhesion between the finished product and the mold core 3. When the withdrawal distance of the core-pulling rod 51 reaches 80% to 100% of its effective core-removal stroke, the pressing section 613 continues to press the extrusion plate 74, so that the lifting rod 73 completes an auxiliary ejection stroke of 3mm to 8mm, thereby helping the finished product to detach from the mold core 3.

[0084] In this embodiment, multiple lifting rods 73 are preferably arranged in the non-appearance area of ​​the bottom of the finished product and distributed near the side core-pulling area of ​​the finished product. For finished products with a length of 80mm to 180mm, the number of lifting rods 73 can be set to 4 to 8. One to two lifting rods 73 are set near the core-pulling areas on both sides, and two to four lifting rods 73 are set in the middle area.

[0085] The lifting rod 73 near the core-pulling area can provide timely lifting support to the local area of ​​the finished product after the core-pulling rod 51 is withdrawn, so as to prevent the finished product from sticking to the mold core 3 due to cooling shrinkage near the side hole. The diameter of the lifting rod 73 is preferably 3mm to 8mm. For thin-walled finished products, the diameter of the lifting rod 73 is preferably 3mm to 5mm and a larger end radius is adopted. For thick-walled finished products or finished products with reinforcing ribs, the diameter of the lifting rod 73 can be 5mm to 8mm to improve lifting stability.

[0086] In this embodiment, the linkage rod 75 and the connecting rod 77 can be set as two sets. The two sets of linkage rods 75 and connecting rods 77 are arranged at intervals along the length of the lifting plate 72 to synchronously push the two ends of the lifting plate 72 upward. The two sets of linkage rods 75 can share a single extrusion plate 74 or correspond to two extrusion plates 74 respectively. If a shared extrusion plate 74 is used, after the cam 61 presses down on the extrusion plate 74, the extrusion plate 74 simultaneously presses the two sets of linkage rods 75, so that the lifting plate 72 moves upward in parallel as a whole. If the two sets of linkage rods 75 correspond to two extrusion plates 74 respectively, the cams 61 on both sides press the corresponding extrusion plates 74 respectively, and transmit the lifting force to both sides of the lifting plate 72 through the corresponding linkage rods 75 and connecting rods 77, so that both sides of the lifting plate 72 obtain the lifting force synchronously. Regardless of which method is used, the tilt of the lifting plate 72 in the moving groove 71 should be controlled within 0.1mm to avoid uneven wear or jamming between the lifting rod 73 and the ejector hole on the mold core 3.

[0087] The working process of this embodiment is as follows:

[0088] When the upper mold 1 moves down to close, the guide pillars 11 on both sides are inserted into the inclined channels 42 on the corresponding slide blocks 41, and push the slide blocks 41 on both sides to move closer to the mold core 3. The core-pulling rods 51 on both sides are inserted into the side forming position of the mold core 3 along with the slide blocks 41. During the insertion process, the core-pulling rods 51 on both sides rotate synchronously through the cooperation of the spiral arc groove 52 and the ball 54, and drive the corresponding cam 61 to rotate to the avoidance state through the limit block 63 and the slot 64, so that the lifting rod 73 retracts into the mold core 3 under the action of the return spring 81.

[0089] Then, injection molding, pressure holding and cooling are carried out. When the mold is opened, the upper mold 1 moves upward, and the guide pillars 11 on both sides drive the sliding blocks 41 on both sides away from the mold core 3. The core pulling rods 51 on both sides simultaneously exit the side of the finished product and rotate in the opposite direction during the exit process to achieve rotation to avoid the core removal.

[0090] In the initial stage of mold opening, cam 61 is opposite to extrusion plate 74 through avoidance section 611 and transition section 612. The lifting rod 73 does not lift the finished product in advance. After the core pulling rods 51 on both sides exit the main interference area on the side of the finished product, the pressing section 613 of the two cams 61 gradually presses the extrusion plate 74. The extrusion plate 74 moves down and drives the linkage rod 75, connecting rod 77 and lifting plate 72 to move. Multiple lifting rods 73 lift the finished product at the same time to achieve smooth material feeding.

[0091] When the mold is closed and reset, the cam 61 gradually moves away from the extrusion plate 74, and the reset spring 81 resets the lifting plate 72 and the lifting rod 73, ensuring that the lifting rod 73 does not protrude from the molding surface of the mold core 3 during the next injection.

[0092] As can be seen from Embodiments 1 and 2, the rotary composite core-removing injection mold provided in this application, through the cooperation between the upper mold 1, lower mold 2, mold core 3, lateral sliding mechanism 4, rotary core-pulling mechanism 5, rotary transmission mechanism 6, linkage ejection mechanism 7 and reset mechanism 8, transforms the lifting action of the upper mold 1 into the lateral movement of the slide 41, the rotational core-removing of the core-pulling rod 51, the delayed pressing of the cam 61 and the auxiliary ejection action of the lifting rod 73. This structure can not only realize the core-pulling molding and rotational core-removing of the side area of ​​the finished product, but also promptly lift the finished product after the core-pulling rod 51 exits the key interference area, so that the core-removing action and the material unloading action form a clear mechanical linkage.

[0093] The significant advantages of this application are:

[0094] First, this application does not rely solely on the straight-line withdrawal of the core-pulling rod 51 from the side of the finished product. Instead, it utilizes the cooperation of the ball bearing 54 and the spiral arc groove 52 to enable the core-pulling rod 51 to rotate synchronously during the movement of the slide block 41. For finished products with side holes, irregular side grooves, or partially undercut areas, the core-pulling rod 51 can generate a rotational avoidance effect during withdrawal, reducing hard scraping and jamming between the core-pulling rod 51 and the inner wall of the finished product's side, and lowering the risk of whitening of the side holes, scratches on the inner wall, and local deformation of the finished product.

[0095] Secondly, this application further utilizes the rotational motion of the core-pulling rod 51 to drive the rotation of the cam 61, which in turn drives the lifting rod 73 to lift the finished product via the extrusion plate 74, linkage rod 75, connecting rod 77, and lifting plate 72. Thus, the core-pulling action of the core-pulling rod 51 is no longer solely used for lateral core pulling, but is reused as an auxiliary material feeding driving force, achieving both rotational core pulling and linked material ejection with a single motion, reducing the number of additional driving components and improving the compactness of the mold structure.

[0096] Third, this application forms a delayed ejection path through the avoidance section 611, transition section 612, and pressing section 613 on the outer periphery of the cam 61. This ensures that the lifting rod 73 will not prematurely lift the finished product before the core-pulling rod 51 has exited the side interference area of ​​the finished product. After the core-pulling rod 51 exits the critical area, the lifting rod 73 performs pre-lifting and ejection. This sequence of actions can prevent the finished product from being prematurely cracked or whitened, and can provide timely auxiliary unloading while the finished product is still cooling, clinging, or partially adhered.

[0097] Fourth, the limiting block 63 and the slot 64 of this application form a sliding torque transmission structure, which enables the core-pulling rod 51 to move axially relative to the cam 61 and drive the cam 61 to rotate when rotating, thereby avoiding the cam 61 from obstructing the core-pulling rod 51 from retracting the core, while ensuring that the rotation driving force can be reliably transmitted to the linkage ejector mechanism 7. The structure is highly feasible.

[0098] The working principle of this application is as follows:

[0099] When the upper mold 1 moves downward, the guide post 11 enters the inclined channel 42 on the slide block 41, converting the vertical mold closing action of the upper mold 1 into the lateral movement of the slide block 41 towards the mold core 3. When the slide block 41 moves, it drives the core-pulling rod 51 to insert into the corresponding molding position of the mold core 3. The ball 54 at the top of the vertical rod 53 cooperates with the spiral arc groove 52 on the outer wall of the core-pulling rod 51, so that the core-pulling rod 51 rotates synchronously during the insertion process. When the core-pulling rod 51 rotates, the limiting block 63 on the outer wall of the core-pulling rod 51 abuts against the slot 64 on the inner wall of the circular groove 62 of the cam 61, and drives the cam 61 to rotate to the avoidance state. The cam 61 does not press the extrusion plate 74. The lifting plate 72 and the lifting rod 73 retract into the mold core 3 under the action of the return spring 81, and then the injection molding is completed.

[0100] After injection molding, the upper mold 1 moves upward, and the guide post 11 drives the slide 41 away from the mold core 3 through the inclined channel 42. The core-pulling rod 51 exits from the side of the finished product along with the slide 41 and rotates in the opposite direction under the action of the ball bearing 54 and the spiral arc groove 52. The reverse rotation of the core-pulling rod 51 causes its molding end to turn from the undercut or irregular interference area on the side of the finished product to the avoidance direction, reducing the core-pulling resistance. The core-pulling rod 51 simultaneously drives the cam 61 to rotate in the opposite direction through the limiting block 63 and the slot 64. In the initial stage of mold opening, the cam 61 is opposite to the extrusion plate 74 with the avoidance section 611 or the transition section 612, so that the lifting rod 73 remains stationary. When the core-pulling rod 51 exits the critical interference area on the side of the finished product, the pressing section 613 of the cam 61 presses the extrusion plate 74. The extrusion plate 74 presses down one end of the linkage rod 75. The linkage rod 75 rotates around the rotating shaft 76 and pushes the lifting plate 72 upward through the connecting rod 77. The lifting plate 72 drives multiple lifting rods 73 to lift the finished product, thereby achieving auxiliary unloading.

[0101] When the mold closes again, cam 61 returns to the avoidance state, and return spring 81 pushes the lifting plate 72 and lifting rod 73 to retract into the mold core 3, and the mold returns to the injection preparation state.

[0102] In summary, the rotary composite core-removal injection mold provided in this application can simultaneously achieve lateral movement of the slide block 41, rotation of the core-pulling rod 51 for core removal, delayed pressing of the cam 61, and material feeding assisted by the lifting rod 73 through the lifting action of the upper mold 1. This solves the problem that the linear withdrawal of the core-pulling rod 51 in existing lateral core-removal molds easily causes side scratches, whitening, and deformation of the finished product. It also solves the problem that the independent core removal and material feeding actions lead to unstable material feeding and the need for an additional drive structure. The structural linkage of this application is clear, and the action sequence is well-defined, which can improve the reliability of core removal and material feeding while ensuring the stability of injection molding. It is suitable for the production of various injection-molded finished products with lateral irregular structures or partial undercut structures.

[0103] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this application.

Claims

1. A rotary composite core-removing injection mold, comprising an upper mold (1), a lower mold (2), and a core (3) disposed on the lower mold (2), characterized in that: At least one side of the mold core (3) is provided with a lateral sliding mechanism (4) that is driven by the lifting action of the upper mold (1) to approach or move away from the mold core (3). The side of the lateral sliding mechanism (4) that is close to the mold core (3) is provided with a swivel core pulling mechanism (5) that can approach or move away from the mold core (3) with the lateral sliding mechanism (4) and rotate around its own axis during the process of approaching or moving away from the mold core (3). The mold core (3) is provided with a rotary transmission mechanism (6) that is in transmission cooperation with the swivel core pulling mechanism (5). The mold core (3) is provided with a linkage ejector mechanism (7) for lifting the finished product. The rotary transmission mechanism (6) is used to transmit the rotation of the swivel core pulling mechanism (5) as a pressing action on the linkage ejector mechanism (7) when the swivel core pulling mechanism (5) moves away from the mold core (3) and rotates around its own axis. The linkage ejector mechanism (7) is provided with a reset mechanism (8) for resetting the linkage ejector mechanism (7).

2. The rotary composite core-removing injection mold according to claim 1, characterized in that: The lateral sliding mechanism (4) includes a slide block (41), which is slidably disposed on the lower mold (2) and located on one side of the mold core (3). An inclined channel (42) is provided on the slide block (41). A guide post (11) that cooperates with the inclined channel (42) is fixedly disposed at the bottom of the upper mold (1). When the guide post (11) moves down with the upper mold (1) and inserts into the inclined channel (42), it pushes the slide block (41) closer to the mold core (3). When the guide post (11) moves up with the upper mold (1), it cooperates with the inclined channel (42) and drives the slide block (41) away from the mold core (3).

3. The rotary composite core-removing injection mold according to claim 2, characterized in that: The rotary core-pulling mechanism (5) includes a core-pulling rod (51), which is rotatably mounted on the side of the slide block (41) near the mold core (3). The outer wall of the core-pulling rod (51) is provided with a spiral arc groove (52). The vertical rod (53) is fixedly mounted on the lower mold (2) or the mold core (3) and located between the mold core (3) and the slide block (41). The top of the vertical rod (53) is provided with a ball (54). The ball (54) is fixed relative to the mold core (3) and extends into the spiral arc groove (52). When the slide block (41) moves, it can drive the core-pulling rod (51) to rotate around its own axis through the cooperation of the ball (54) and the spiral arc groove (52).

4. The rotary composite core-removing injection mold according to claim 3, characterized in that: The end of the core-pulling rod (51) near the mold core (3) can be inserted into the mold core (3). The end of the core-pulling rod (51) near the mold core (3) is used to form the core-pulling forming area on the side of the finished product. The core-pulling rod (51) can be withdrawn from the side of the finished product when the slide (41) moves away from the mold core (3) and rotates around its own axis.

5. A rotary composite core-removing injection mold according to claim 3, characterized in that: The rotary transmission mechanism (6) includes a cam (61) rotatably disposed in the mold core (3). A circular groove (62) is provided at the center of the cam (61) for the core-pulling rod (51) to pass through. Multiple limiting blocks (63) are fixedly disposed on the outer wall of the core-pulling rod (51). A slot (64) that cooperates with the limiting block (63) is provided on the inner wall of the circular groove (62). The slot (64) extends along the moving direction of the core-pulling rod (51). The limiting block (63) can slide in the slot (64) along the moving direction of the core-pulling rod (51). When the core-pulling rod (51) rotates, it can drive the cam (61) to rotate through the cooperation of the limiting block (63) and the slot (64).

6. A rotary composite core-removing injection mold according to claim 5, characterized in that: The outer periphery of the cam (61) is provided with a clearance section (611), a transition section (612) and a top pressure section (613) in sequence along the rotation direction. The clearance section (611) is used to be opposite to the linkage ejector mechanism (7) in the mold closing state and not to apply top pressure to the linkage ejector mechanism (7). The top pressure section (613) is used to press the linkage ejector mechanism (7) to move during the mold opening and core removal process.

7. A rotary composite core-removing injection mold according to claim 5, characterized in that: The linkage ejection mechanism (7) includes a movable groove (71) opened below the mold core (3), a lifting plate (72) is movably arranged in the movable groove (71), and a plurality of lifting rods (73) are fixedly arranged on the lifting plate (72). The lifting rods (73) pass upward through the mold core (3) and are used to lift the finished product.

8. A rotary composite core-removing injection mold according to claim 7, characterized in that: The linkage ejector mechanism (7) also includes an extrusion plate (74) that is driven by the outer periphery of the cam (61). The bottom of the extrusion plate (74) is hinged with a linkage rod (75). The middle part of the linkage rod (75) is rotatably disposed in the lower mold (2) or the mold core (3) through a rotating shaft (76). The end of the linkage rod (75) away from the extrusion plate (74) is hinged with a connecting rod (77). The end of the connecting rod (77) away from the linkage rod (75) is hinged to the bottom of the lifting plate (72).

9. A rotary composite core-removing injection mold according to claim 8, characterized in that: When the cam (61) rotates to the point where the top pressing section (613) contacts the extrusion plate (74), the extrusion plate (74) can move downward and drive the linkage rod (75) to rotate around the rotating shaft (76). The end of the linkage rod (75) away from the extrusion plate (74) can push the lifting plate (72) upward through the connecting rod (77).

10. A rotary composite core-removing injection mold according to claim 1, characterized in that: The reset mechanism (8) includes a reset spring (81), which is sleeved on the outside of the lifting rod (73). One end of the reset spring (81) abuts against the top of the moving groove (71), and the other end of the reset spring (81) abuts against the lifting plate (72). The reset spring (81) is used to drive the lifting plate (72) and the lifting rod (73) to reset after the cam (61) releases the pressure on the linkage lifting mechanism (7).

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