Multi-level composite core-pulling handle injection mold and composite core-pulling method thereof

Abstract

The application provides a multi-level composite core-pulling handle injection mold and a composite core-pulling method thereof. The mold comprises a supporting base, a lower mold mechanism and an upper mold mechanism, which jointly define two independent injection cavities; the lower mold mechanism comprises a lower inner mold assembly and two groups of composite avoidance core-pulling assemblies on the two sides of the lower inner mold assembly; the upper mold mechanism comprises an upper inner mold assembly and two groups of composite slope core-pulling assemblies on the two sides of the upper inner mold assembly; a double-station bottom core-pulling assembly is arranged in the middle of the supporting base; each group of composite avoidance core-pulling assemblies comprises a first outer pull slope core-pulling assembly and a second outer pull slope core-pulling assembly which are in an eight-shaped closed distribution, and an avoidance driving assembly which drives the first outer pull slope core-pulling assembly to avoid horizontally; the method comprises the following steps: synchronously performing lateral composite core-pulling; synchronously starting the first outer pull slope core-pulling assembly to perform multi-axis sequential core-pulling; synchronously avoiding horizontally; synchronously starting the second outer pull slope core-pulling assembly to perform core-pulling; and synchronously completing bottom composite core-pulling. The application relates to the technical field of handle injection.

Description

Technical Field

[0001] This invention relates to the field of handle injection molding technology, and more particularly to a multi-level composite core-pulling handle injection mold and its composite core-pulling method. Background Technology

[0002] In the field of injection mold technology, the core-pulling structure is a key functional unit for the smooth demolding of plastic parts with complex geometric features such as side recesses and undercuts. For complex components such as handles, existing technologies have developed various mechanisms, including angled ejector core-pulling, slider core-pulling, and hydraulic cylinder-driven core-pulling, to address demolding requirements in different directions. These technical solutions typically focus on core-pulling actions in a single or limited number of directions, achieving their function through independent drive components, and basically meeting the production requirements of conventional plastic parts.

[0003] However, when the structure of the plastic part is extremely complex, requiring the simultaneous molding of two workpieces in the same mold (dual-station), and each workpiece needs to undergo multi-directional and multi-level sequential core pulling—for example, the handle product involved in this solution, which simultaneously requires the sequential or synchronous completion of lateral compound angle core pulling, internal multi-axis linkage core pulling, and bottom compound core pulling in two independent cavities on the left and right sides—the existing technical solutions reveal significant limitations: the parallel arrangement of multiple independent and discrete drive and guide mechanisms not only results in an abnormally bulky overall mold structure and difficult spatial layout, but also makes it prone to motion interference during the core pulling process due to the lack of integrated coordination control and spatial avoidance mechanisms between the mechanisms; at the same time, the timing of the actions of multiple independent drive sources is difficult to synchronize precisely, which not only increases the complexity of the control system, but also seriously restricts the demolding accuracy and production efficiency, and brings the risk of accelerated component wear or product tearing.

[0004] Therefore, the inventors urgently need a multi-level composite core-pulling handle injection mold and its composite core-pulling method to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of the prior art, this invention provides a multi-level composite core-pulling handle injection mold and its composite core-pulling method. It aims to solve the problems of bulky overall structure, lack of coordination and avoidance mechanism between core-pulling components leading to motion interference, complex control, and low core-pulling accuracy and efficiency in existing dual-station multi-core-pulling action molds due to the use of multiple independent drive mechanisms.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a multi-layered composite core-pulling handle injection mold, including a supporting base, a lower mold mechanism disposed on the upper end of the supporting base, and an upper mold mechanism cooperating with the upper end of the lower mold mechanism. The upper mold mechanism and the lower mold mechanism together define two independent injection cavities symmetrically distributed to the left and right. The lower mold mechanism includes a lower inner mold assembly and two sets of composite clearance core-pulling assemblies respectively located on both sides of the lower inner mold assembly. Each set of composite clearance core-pulling assemblies corresponds to one injection cavity. The lower inner mold assembly includes two symmetrically arranged handle injection lower inner molds. The upper mold mechanism includes an upper inner mold assembly and two sets of composite clearance core-pulling assemblies respectively located on both sides of the lower inner mold assembly. Two sets of composite angled core-pulling assemblies are diagonally inserted from top to bottom on both sides of the upper inner mold assembly. Each set of composite angled core-pulling assemblies corresponds to one injection cavity. The supporting base includes a dual-station bottom core-pulling assembly located in the middle. Each set of composite avoidance core-pulling assemblies includes a first outward angled core-pulling module and a second outward angled core-pulling module arranged in a figure-eight closed distribution and symmetrically arranged with each other along the extraction direction, as well as an avoidance driving module driven by the first outward angled core-pulling module. After the first outward angled core-pulling module completes core-pulling, the avoidance driving module drives the first outward angled core-pulling module to move away from the second outward angled core-pulling module to avoid it.

[0007] Based on the above, a multi-level composite core-pulling handle injection mold and its composite core-pulling method aim to solve the problems of bulky overall structure, lack of coordination and avoidance mechanism between core-pulling components leading to motion interference, complex control, and low core-pulling accuracy and efficiency in existing dual-station multi-core-pulling action molds due to the use of multiple independent drive mechanisms; mainly reflected in:

[0008] 1. This invention integrates two complete core-pulling systems used for molding the left and right handle workpieces into two sets of composite avoidance core-pulling assemblies located on both sides of the lower inner mold assembly and two sets of composite slope core-pulling assemblies located on both sides of the upper inner mold assembly. The two stations share a single set of dual-station bottom core-pulling assemblies located in the middle. This transforms the traditional method of setting independent and decentralized driving mechanisms for each core-pulling action into a highly integrated and modular group layout, thereby significantly simplifying the mechanical structure of the mold and solving the problem of bloated overall structure caused by using multiple independent driving mechanisms.

[0009] 2. This invention establishes a mandatory sequential action and spatial avoidance mechanism for the two sets of core-pulling modules that are spatially distributed and at risk of interference. This structurally eliminates the occurrence of motion interference and solves the problem of motion interference caused by the lack of coordination and avoidance mechanism between the core-pulling components.

[0010] 3. This invention integrates multiple core-pulling actions that originally required independent and asynchronous control in a dual-station mold into several integrated action units that can be triggered synchronously and have a preset mechanical sequence through the architecture of two sets of composite avoidance core-pulling components, two sets of composite inclined core-pulling components, and dual-station bottom core-pulling components. This greatly simplifies the complexity of the external control system. At the same time, this rigid sequence and spatial avoidance design based on mechanical structure and the symmetrical synchronous action of dual-station components ensures the reliability and repeatability of the core-pulling action, thereby solving the problems of complex control, low core-pulling accuracy and efficiency.

[0011] Furthermore, the upper inner mold assembly includes two symmetrically arranged handle injection upper inner molds, and each of the composite angle core-pulling assemblies includes a composite angle core-pulling unit movably disposed within the handle injection upper inner mold. The composite angle core-pulling unit includes a first angled pull rod and a second angled pull rod respectively angledly disposed on both sides of the injection groove, a first connecting key slidably sleeved on the first angled pull rod and a second connecting key slidably sleeved on the second angled pull rod, a composite core-pulling block fixedly connected to both the first connecting key and the second connecting key, and a limiting core-pulling block that slides perpendicularly to the outer wall of the composite core-pulling block.

[0012] Based on the above, the beneficial effect of the upper inner mold of the handle injection molding is that it cooperates with the lower inner mold of the handle injection molding to jointly form a precise cavity for molding the handle plastic part; the beneficial effect of the first and second inclined pull rods is that they are respectively set at specific inclined angles on both sides of the injection groove, realizing the lateral features with specific spatial angles (such as back key mounting holes) on the directly molded plastic part, and performing core pulling and demolding along this preset angle; the beneficial effect of the first and second connecting keys is that they transmit the linear motion of the composite core pulling block to the first and second inclined pull rods respectively, and slide on the first and second inclined pull rods, realizing the conversion of horizontal linear motion into driving the first and second inclined pull rods. The inclined pull rods move in an oblique linear motion along their own axes; the beneficial effect of the composite core-pulling block is that it receives a linear driving force from an external drive mechanism in a single direction and distributes this force synchronously and equally to the first connecting key and the second connecting key, realizing the coordinated composite core-pulling motion of the two inclined pull rods driven synchronously by a single drive source; the beneficial effect of the limiting core-pulling block is that it locks the composite core-pulling block vertically during the mold closing and injection stages, preventing it from displacing under injection pressure, ensuring the stability of the cavity, and pulling it out before core pulling, thus releasing the constraint on the composite core-pulling block, making room for the horizontal linear motion of the composite core-pulling block, and realizing the sequential control of the core-pulling action.

[0013] Furthermore, the first outward pulling and tilting module includes a first four-axis linkage outward pulling mechanism and a first inclined hydraulic cylinder pushing mechanism disposed at the outer end of the first four-axis linkage outward pulling mechanism, and the second outward pulling and tilting module includes a second four-axis linkage outward pulling mechanism symmetrically disposed with the first four-axis linkage outward pulling mechanism and a second inclined hydraulic cylinder pushing mechanism disposed below the second four-axis linkage outward pulling mechanism.

[0014] Based on the above, the beneficial effect of the first four-axis linkage external pulling mechanism is that it transforms the linear motion from a single drive source into the sequential and coordinated linear pulling action of four core-pulling parts with different depths and orientations through its internal multi-layer sliding sleeve structure, realizing the axial sequential demolding of multiple orientations such as the center, interior, bottom, and top of a part of an injection molded part, including undercuts and side recesses; the beneficial effect of the first inclined cylinder pushing mechanism is that by providing precise and controllable inclined linear driving force to the first four-axis linkage external pulling mechanism, it triggers and maintains the entire first external pulling inclined pulling mold assembly to perform core-pulling actions in a predetermined sequence; the second four-axis linkage external pulling machine... The beneficial effect of the structure is that, with a structure symmetrical to the first four-axis linkage external pulling mechanism and the same working principle, it can perform axial sequential core pulling of multiple directional undercut structures in another adjacent and symmetrical area in the same injection molding cavity, realizing the demolding of complex internal cavities on a complete workpiece in coordination with the first four-axis linkage external pulling mechanism; the beneficial effect of the second inclined hydraulic cylinder pushing mechanism is that, by providing driving force to the second four-axis linkage external pulling mechanism, it can independently trigger the second external pulling inclined pulling module to perform core pulling action after the first external pulling inclined pulling module completes core pulling and avoids, ensuring that the actions of the two sets of core pulling modules distributed in the figure-eight pattern are sequential in time and free from interference in space.

[0015] Furthermore, the first four-axis linkage external pulling mechanism includes a guide limiting module, an external pulling drive module, and an inclined pulling core pulling module. The guide limiting module includes an external pulling limiting frame and several guide rods connected to the inner sides of both ends of the external pulling limiting frame. The external pulling drive module includes a first external pulling component, a second external pulling component, a third external pulling component, and a fourth external pulling component that are slidably sleeved on the guide rods from the outside to the inside. The inclined pulling core pulling module includes a middle core pulling component connected to the first external pulling component, an inner core pulling component connected to the second external pulling component, a bottom core pulling component connected to the third external pulling component, and a top inclined core pulling component connected to the fourth external pulling component.

[0016] Based on the above, the beneficial effects of the guide and limit module are that it provides a unified and stable installation foundation and motion guide reference for the external pull drive module and the inclined pull core pulling module; the beneficial effect of the external pull limit frame is that it fixes the guide rod; the beneficial effect of the guide rod is that it provides a linear motion track for all external pull components in the external pull drive module, ensuring that each external pull component moves linearly with high precision and low friction along a predetermined axis; the beneficial effect of the external pull drive module is that by sequentially sliding the first external pull component, the second external pull component, the third external pull component, and the fourth external pull component onto the guide rod from the outside to the inside, a stacked structure for mechanically sequentially transmitting power is formed, realizing the single input motion from the first inclined cylinder push mechanism according to a preset... The mechanical sequence is decomposed and transmitted to different core-pulling components in the inclined core-pulling module; the beneficial effect of the first outer pull component is that, as the outermost component in the outer pull drive module, it directly receives the driving power and moves along the guide rod; the beneficial effect of the second outer pull component is that it is slidably sleeved on the guide rod and located inside the first outer pull component. After the first outer pull component moves to the end of its stroke relative to the second outer pull component, it is pushed to begin moving together with the first outer pull component, realizing the triggering and transmission of the second-level action; the beneficial effect of the third outer pull component is that it is slidably sleeved on the guide rod and located inside the second outer pull component. After the second outer pull component moves to the end of its stroke relative to the third outer pull component, it is pushed to begin moving together with the first and second outer pull components. The components move together, triggering and transmitting the third-level action; the fourth pull component is slidably sleeved on the guide rod and serves as the innermost component of the pull drive module. After the third pull component moves to the end of its stroke relative to the fourth pull component, it is pushed to begin moving together with the first, second, and third pull components, triggering and outputting the final-level action; the inclined core-pulling module converts the sequential linear motion output by the pull drive module into direct action on different parts of the plastic part through the separately fixedly connected core-pulling components, transforming the coordinated linear power into direct demolding of the undercut structures in specific areas of the middle, interior, bottom, and top of the plastic part; the middle core-pulling module is beneficial because it works in conjunction with the first, second, and third pull components. The first pull-out component connects to the second pull-out component and moves synchronously with its linear movement, enabling the initial core-pulling and demolding of the undercut structure in the center area of ​​the plastic part. The internal core-pulling component connects to the second pull-out component and moves synchronously with its linear movement, enabling the core-pulling and demolding of the undercut structure in the inner area of ​​the plastic part after the center core-pulling is completed. The bottom core-pulling component connects to the third pull-out component and moves synchronously with its linear movement, enabling the core-pulling and demolding of the undercut structure in the bottom area of ​​the plastic part. The top inclined core-pulling component connects to the fourth pull-out component and moves synchronously with its linear movement, enabling the final core-pulling and demolding of the inclined undercut structure in the top area of ​​the plastic part.

[0017] Furthermore, the external pull drive module also includes a guide limiting component, which includes a first external pull guide limiting member fixedly connected to the first external pull member, a second external pull guide limiting member fixedly connected to the second external pull member, a third external pull guide limiting member fixedly connected to the third external pull member, and a fourth external pull guide limiting member fixedly connected to the fourth external pull member. The first external pull guide limiting member is provided with a first external pull guide rod. The second external pull guide limiting member, the third external pull guide limiting member, and the fourth external pull guide limiting member are sequentially slidably engaged on the first external pull guide rod. The fourth external pull guide limiting member has a secondary layered limiting inclined slide on one side away from the fourth external pull member along the core pulling direction. The secondary layered limiting inclined slide includes a first inclined limiting slide corresponding to the second external pull guide limiting member and a second inclined limiting slide corresponding to the third external pull guide limiting member.

[0018] Based on the above, the beneficial effect of the guide limiting component is that it establishes an independent and parallel auxiliary guiding and mold closing sequence limiting path on one side of the guide rod (22132) axis of the external pull drive module, realizing forced mechanical layered control of the reset sequence of each external pull component during the mold closing process, ensuring that it can be accurately reset to the injection position without interference; the beneficial effect of the first external pull guide limiting component is that it is fixedly connected to the first external pull component, transmitting the motion state of the first external pull component to the path of the guide limiting component, and providing an installation base for the first external pull guide rod, realizing To establish a reference for motion and guidance for the entire guide and limiting system; the beneficial effect of the second external pull guide limiting component is that it is fixedly connected to the second external pull component, transmitting the motion state of the second external pull component to the path of the guide limiting component, and interacting with the secondary layered limiting inclined slide on the fourth external pull guide limiting component during mold closing, realizing controlled hard limiting of the final position of the second external pull component during mold closing; the beneficial effect of the third external pull guide limiting component is that it is fixedly connected to the third external pull component, transmitting the motion state of the third external pull component to the path of the guide limiting component. In the process of mold closing, the fourth outer pull guide limiter interacts with the secondary layered limiting inclined slide on the fourth outer pull guide limiter, achieving controlled hard limiting of the final position of the third outer pull component during mold closing. The beneficial effect of the fourth outer pull guide limiter is that it is fixedly connected to the fourth outer pull component, transmitting the motion state of the fourth outer pull component to the path of the guide limiter, and serving as the first reset reference for the mold closing motion. Through the secondary layered limiting inclined slide on its side, it sequentially contacts the third and second outer pull guide limiters, realizing the use of the fourth outer pull component for mold closing motion. The first pull guide rod provides a common precision linear sliding track for the fourth, third, and second pull guide limiters, ensuring that these guide limiters can slide smoothly along the same axis. The second layered limiting inclined slide transforms the unidirectional linear mold closing movement of the fourth pull member into a forced mechanical limit on the two different reset endpoints of the third and second pull members, with a sequential order.

[0019] Furthermore, the avoidance drive module includes a slide rail base plate and an outward avoidance cylinder mounted below the slide rail base plate. The first outward pulling and tilting module is installed on the upper end of the slide rail base plate. The slide rail base plate is provided with an outward push guide port that is perpendicular to the core pulling direction of the first outward pulling and tilting module on the horizontal plane. The output end of the outward avoidance cylinder is connected to the first outward pulling and tilting module through the outward push guide port.

[0020] Based on the above, the beneficial effects of the avoidance drive module are as follows: after the first external pulling and tilting module completes its own core-pulling action, it drives the entire first external pulling and tilting module to move laterally, thereby providing the necessary core-pulling movement space for the second external pulling and tilting module; the beneficial effect of the slide rail base plate is that it can install the external push avoidance cylinder and provide a precise sliding track and support for the overall lateral avoidance movement of the first external pulling and tilting module; the beneficial effect of the external push avoidance cylinder is that after receiving the control signal, it outputs linear thrust, directly driving the entire first external pulling and tilting module to move laterally along the slide rail base plate; the beneficial effect of the external push guide is that it guides the displacement direction of the first external pulling and tilting module, ensuring that the driving force generated by the external push avoidance cylinder can push the entire first external pulling and tilting module to perform the lateral avoidance action without loss or off-center load.

[0021] Furthermore, the upper end of the lower inner mold of the handle injection molding cooperates with the lower end of the upper inner mold of the handle injection molding, and together they form the core cavity part for molding the handle grip in each injection cavity when the mold is closed. The core-pulling end of the composite avoidance core-pulling assembly extends into the injection cavity when the mold is closed.

[0022] Based on the above, the beneficial effect of the upper end of the lower inner mold of the handle injection molding cooperating with the lower end of the upper inner mold of the handle injection molding is that it constitutes the main part of the mold parting surface, realizing the formation of a closed matrix space for containing molten plastic when the mold is closed.

[0023] Furthermore, the dual-station bottom core-pulling assembly includes lifting and pushing core-pulling modules symmetrically arranged on both sides of the lower inner mold assembly, and two inclined core-pulling modules located at both ends between the two lifting and pushing core-pulling modules. The lifting and pushing core-pulling module includes a lifting core-pulling mounting frame, a lifting drive cylinder installed at the lower end of the lifting core-pulling mounting frame, a double-headed pusher component disposed on the lifting drive cylinder, inclined pusher slide rail sliders respectively disposed at both ends of the double-headed pusher component, and an edge protruding core-pulling rod slidably engaged with the inclined slide rail at the upper end of the inclined pusher slide rail slider. During core pulling, the lifting drive cylinder drives the inclined pusher slide rail slider to retract and reset, and the edge protruding core-pulling rod descends vertically along the inclined slide rail to complete the core pulling. The two ends of the double-headed pusher component correspond to one of the handle injection molding lower inner molds.

[0024] Based on the above, the beneficial effects of the dual-station bottom-pulling core-pulling assembly are: to simultaneously complete the composite core-pulling demolding of two independent workpieces with different directions and types of undercut features at the bottom using a single central component; the beneficial effect of the lifting and pushing core-pulling module is to simultaneously and vertically pull the protruding features at the bottom edges of the two handle plastic parts; the beneficial effect of the lifting core-pulling mounting bracket is to install and fix the lifting drive cylinder and provide guidance and installation foundation for the inclined push slide rail slider and the edge protruding core-pulling rod, thus providing a stable structural platform for the entire lifting and pushing operation; the beneficial effect of the lifting drive cylinder is to provide controllable linear driving force for the bottom core-pulling action; the beneficial effect of the double-headed push component is to simultaneously and equally transmit and distribute the power generated by a single lifting drive cylinder to the inclined push slide rail slider serving the two stations; the beneficial effect of the inclined push slide rail slider is to convert the horizontal movement transmitted from the double-headed push component into a mechanical conversion that drives the edge protruding core-pulling rod to perform vertical lifting and lowering movement through the cooperation of the inclined rail and the slider; the beneficial effect of the edge protruding core-pulling rod is to directly mold and finally pull out the specific edge undercut features at the bottom of the plastic part.

[0025] Furthermore, the inclined inner bottom core-pulling module includes an inclined base and an injection molding core-pulling rod fixed in the inclined base and extending obliquely into the inner mold of the handle injection molding. The two inclined inner bottom core-pulling modules correspond to one of the handle injection molding inner molds.

[0026] Based on the above, the beneficial effect of the inclined inner bottom core-pulling module is to form and pull the undercut features in the inner cavity of the plastic part; the beneficial effect of the inclined base is to ensure that the inclined core-pulling movement path of the core-pulling rod of the injection molded part is stable and reliable.

[0027] Furthermore, the present invention also discloses a composite core-pulling method for a multi-level composite core-pulling handle injection mold, comprising the following steps:

[0028] S1. Mold opening starts, and the two sets of composite angle core-pulling components located on the left and right sides of the mold move synchronously: the limiting core-pulling blocks in each set are first pulled out in the vertical direction to release the limiting of the composite core-pulling blocks; then the external drive mechanism pushes the composite core-pulling blocks to move linearly, and the linear motion is decomposed and converted into synchronous composite core-pulling motion that drives the first angled pull rod and the second angled pull rod to move along their respective angled trajectories through the first connecting key and the second connecting key, thereby simultaneously completing the core-pulling and demolding of the plastic parts with lateral composite angle features in the left and right injection cavities;

[0029] S2. The two sets of composite avoidance core-pulling components located on the left and right sides of the mold start core-pulling synchronously: the first inclined hydraulic cylinder push mechanism of each set drives the first four-axis linkage external pull mechanism to move in sequence according to a preset order, driving the middle core-pulling component, the internal core-pulling component, the bottom core-pulling component and the top inclined core-pulling component to complete the multi-directional sequential core-pulling action of the corresponding area of ​​the first external pull inclined core-pulling module on that side.

[0030] S3. After the first external pulling and tilting core-pulling module in both sets of composite avoidance core-pulling assemblies has completed core-pulling, the avoidance driving module of each set synchronously drives its first external pulling and tilting core-pulling module to move laterally away from the second external pulling and tilting core-pulling module in the same set, thereby completing spatial avoidance;

[0031] S4. Subsequently, the second external pull-angle pulling module in the two sets of composite avoidance core pulling components simultaneously starts core pulling: the second oblique hydraulic cylinder pushing mechanism of each set drives the second four-axis linkage external pull mechanism to act in a preset sequence, completing the multi-directional sequential core pulling action of the corresponding area of ​​the second external pull-angle pulling module on that side;

[0032] S5. The dual-station bottom core-pulling assembly is activated, simultaneously acting on the left and right injection cavities: its lifting drive cylinder drives the inclined push slide rail slider to retract and reset, causing the edge protruding core-pulling rod to descend vertically along the inclined slide rail to complete the core pulling; at the same time, the core-pulling rod of the injection molded part is drawn out obliquely; thus, the composite core pulling and demolding of the bottom of the left and right handle plastic parts is completed simultaneously.

[0033] Based on the above, the beneficial effect of step S1 is that the two sets of composite angled core-pulling components move synchronously, decomposing the single drive into two oblique movements through mechanical conversion, thereby synchronously completing the core-pulling and demolding of the two workpieces with lateral composite angle features; the beneficial effect of step S2 is that the two sets of composite avoidance core-pulling components start synchronously, driving multiple core-pulling parts to move sequentially through the mechanical sequential linkage of the first four-axis linkage external pulling mechanism, thereby synchronously completing the sequential demolding of the multi-directional undercuts inside the first area of ​​the two workpieces; the beneficial effect of step S3 is that after the first stage of core pulling at both stations is completed, the two workpieces are synchronously driven... The first set of external pulling and tilting mold groups moves laterally to avoid obstacles, thus clearing a space free from interference for the next stage of core pulling. The beneficial effect of step S4 is that after the avoidance action is completed, the two sets of second external pulling and tilting mold groups are started simultaneously. Through the action of the second four-axis linkage external pulling mechanism, the sequential core pulling and demolding of the remaining internal structure of the second area of ​​the two workpieces is completed simultaneously. The beneficial effect of step S5 is that the dual-station bottom core pulling assembly is started. Through a set of drives, both vertical and tilting core pulling actions are triggered simultaneously, thus completing the composite core pulling and demolding of all complex features at the bottom of the two workpieces simultaneously.

[0034] To make the above features of the present invention and the objectives to be achieved clearer, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0035] Figure 1 : This is a perspective view of the present invention;

[0036] Figure 2 : This is a schematic diagram of the internal structure of the present invention;

[0037] Figure 3 This is a schematic diagram illustrating the cooperation between the dual-station bottom-pulling core-pulling assembly and the composite avoidance core-pulling assembly of the present invention.

[0038] Figure 4 : This is a schematic diagram of the lifting and pushing core-pulling module of the present invention;

[0039] Figure 5 : This is a schematic diagram of the composite avoidance core-pulling assembly of the present invention;

[0040] Figure 6 : This is a schematic diagram of the inclined core-pulling module of the present invention;

[0041] Figure 7 : This is a schematic diagram of the second external pull-out oblique module of the present invention;

[0042] Figure 8 : This is a schematic diagram of the guide and limiting component of the present invention;

[0043] Figure 9 : This is a schematic diagram of the upper inner mold assembly of the present invention;

[0044] Figure 10 : This is a schematic diagram of the composite inclined core-pulling assembly of the present invention;

[0045] Figure 11 : This is a flowchart of the composite core-pulling method of the present invention.

[0046] Reference numerals: 1-Support base; 11-Dual-station bottom core-pulling assembly; 111-Lifting and pushing core-pulling module; 1111-Lifting core-pulling mounting bracket; 1112-Lifting drive cylinder; 1113-Double-head pushing component; 1114-Sloping pushing slide rail slider; 1115-Edge protruding core-pulling rod; 112-Sloping inner bottom core-pulling module; 1121-Sloping base; 1122-Injection molded part inner cavity forming core-pulling rod; 2-Lower mold mechanism; 21-Lower inner mold assembly; 211-Handle injection molding lower inner mold assembly. Module, 22-Composite avoidance core-pulling assembly, 221-First outward pull angled pull module, 2211-First four-axis linkage outward pull mechanism, 2212-First angled hydraulic cylinder pushing mechanism, 2213-Guide limiting module, 22131-Outward pull limiting frame, 22132-Guide rod, 2214-Outward pull drive module, 22141-First outward pull component, 22142-Second outward pull component, 22143-Third outward pull component, 22144-Fourth outward pull component, 22145-Guide limiting component. 22146 - First outward pull guide limiter, 221461 - First outward pull guide rod, 22147 - Second outward pull guide limiter, 22148 - Third outward pull guide limiter, 22149 - Fourth outward pull guide limiter, 221491 - Secondary layered limiting inclined slide, 2215 - Inclined pull-out core module, 22151 - Middle pull-out core module, 22152 - Internal pull-out core module, 22153 - Bottom pull-out core module, 22154 - Top inclined pull-out core module, 222 - Second outward pull-out inclined slide Module, 2221-Second four-axis linkage external pulling mechanism, 2222-Second oblique cylinder pushing mechanism, 223-Avoidance drive module, 2231-Slide rail base plate, 2232-Outward push avoidance cylinder, 3-Upper mold mechanism, 31-Upper inner mold assembly, 311-Handle injection upper inner mold, 32-Composite oblique core pulling assembly, 321-First oblique pull rod, 322-Second oblique pull rod, 323-First connecting key, 324-Second connecting key, 325-Composite core pulling block, 326-Limiting core pulling block. Detailed Implementation

[0047] See Figures 1-11 As shown,

[0048] This invention provides a multi-level composite core-pulling handle injection mold, including a support base 1, a lower mold mechanism 2 disposed on the upper end of the support base 1, and an upper mold mechanism 3 cooperating with the upper end of the lower mold mechanism 2. The upper mold mechanism 3 and the lower mold mechanism 2 together define two independent injection cavities symmetrically distributed to the left and right. The lower mold mechanism 2 includes a lower inner mold assembly 21 and two sets of composite clearance core-pulling assemblies 22 respectively located on both sides of the lower inner mold assembly 21. Each set of composite clearance core-pulling assemblies 22 corresponds to one injection cavity. The lower inner mold assembly 21 includes two symmetrically arranged handle injection lower inner molds 211. The upper mold mechanism 3 includes an upper inner mold assembly 31 and two sets of composite clearance core-pulling assemblies 22 respectively located on the upper end of the upper inner mold assembly 31. Two sets of composite angled core-pulling assemblies 32 are diagonally inserted from top to bottom on the side. Each set of composite angled core-pulling assemblies 32 corresponds to one injection molding cavity. The supporting base 1 includes a dual-station bottom core-pulling assembly 11 located in the middle. Each set of composite avoidance core-pulling assemblies 22 includes a first external pull angled core-pulling module 221 and a second external pull angled core-pulling module 222 arranged in a figure-eight closed distribution along the extraction direction and symmetrically arranged with each other, as well as an avoidance driving module 223 driven by the first external pull angled core-pulling module 221. After the first external pull angled core-pulling module 221 completes core-pulling, the avoidance driving module 223 drives the first external pull angled core-pulling module 221 to move away from the second external pull angled core-pulling module 222 to avoid it.

[0049] In this embodiment, the upper inner mold assembly 31 includes two symmetrically arranged handle injection upper inner molds 311. Each composite angle core-pulling assembly 32 includes a composite angle core-pulling unit movably disposed within the handle injection upper inner mold 311. The composite angle core-pulling unit includes a first angled pull rod 321 and a second angled pull rod 322 respectively angledly disposed on both sides of the injection groove, a first connecting key 323 slidably sleeved on the first angled pull rod 321 and a second connecting key 324 slidably sleeved on the second angled pull rod 322, a composite core-pulling block 325 fixedly connected to the first connecting key 323 and the second connecting key 324, and a limiting core-pulling block 326 that slides perpendicularly to the outer wall of the composite core-pulling block 325.

[0050] In this embodiment, the first external pull-out module 221 includes a first four-axis linkage external pull mechanism 2211 and a first inclined hydraulic cylinder pushing mechanism 2212 disposed at the outer end of the first four-axis linkage external pull mechanism 2211. The second external pull-out module 222 includes a second four-axis linkage external pull mechanism 2221 symmetrically disposed with the first four-axis linkage external pull mechanism 2211 and a second inclined hydraulic cylinder pushing mechanism 2222 disposed below the second four-axis linkage external pull mechanism 2221.

[0051] In this embodiment, the first four-axis linkage pull mechanism 2211 includes a guide limiting module 2213, a pull driving module 2214, and a diagonal pull core-pulling module 2215. The guide limiting module 2213 includes a pull limiting frame 22131 and a plurality of guide rods 22132 connected to the inner sides of both ends of the pull limiting frame 22131. The pull driving module 2214 includes a first pull component 22141, a second pull component 22141, and a third pull component 22142, which are sequentially slidably sleeved on the guide rods 22132 from the outside to the inside. The diagonal pull core-pulling module 2215 includes a middle core-pulling member 22151 connected to the first external pull member 22141, an inner core-pulling member 22152 connected to the second external pull member 22142, a bottom core-pulling member 22153 connected to the third external pull member 22143, and a top diagonal core-pulling member 22154 connected to the fourth external pull member 22144.

[0052] In this embodiment, the pull-out drive module 2214 further includes a guide limiting component 22145. The guide limiting component 22145 includes a first pull-out guide limiting member 22146 fixedly connected to the first pull-out component 22141, a second pull-out guide limiting member 22147 fixedly connected to the second pull-out component 22142, a third pull-out guide limiting member 22148 fixedly connected to the third pull-out component 22143, and a fourth pull-out guide limiting member 22149 fixedly connected to the fourth pull-out component 22144. A first pull-out guide rod 221461 is provided on the first pull-out guide limiting member 22146. The second external pull guide limiting member 22147, the third external pull guide limiting member 22148, and the fourth external pull guide limiting member 22149 are sequentially slidably fitted on the first external pull guide rod 221461. The fourth external pull guide limiting member 22149 has a secondary layered limiting inclined slide 221491 on one side away from the fourth external pull member 22144 along the core pulling direction. The secondary layered limiting inclined slide 221491 includes a first inclined limiting slide corresponding to the second external pull guide limiting member 22147 and a second inclined limiting slide corresponding to the third external pull guide limiting member 22148.

[0053] In this embodiment, the avoidance drive module 223 includes a slide rail base plate 2231 and an outward avoidance cylinder 2232 mounted below the slide rail base plate 2231. The first outward pull-angle module 221 is installed on the upper end of the slide rail base plate 2231. The slide rail base plate 2231 is provided with an outward push guide port that is perpendicular to the core pulling direction on the horizontal plane of the first outward pull-angle module 221. The output end of the outward avoidance cylinder 2232 is connected to the first outward pull-angle module 221 through the outward push guide port.

[0054] In this embodiment, the upper end of the lower inner mold 211 of the handle injection molding cooperates with the lower end of the upper inner mold 311 of the handle injection molding, and together they form the core cavity part for molding the handle grip in each injection cavity when the mold is closed. The core-pulling end of the composite avoidance core-pulling assembly 22 extends into the injection cavity when the mold is closed.

[0055] In this embodiment, the dual-station bottom-pulling core-pulling assembly 11 includes lifting and pushing core-pulling modules 111 symmetrically arranged on both sides of the lower inner mold assembly 21, and two oblique inner bottom-pulling core-pulling modules 112 located at both ends between the two lifting and pushing core-pulling modules 111. The lifting and pushing core-pulling module 111 includes a lifting core-pulling mounting frame 1111, a lifting drive cylinder 1112 installed at the lower end of the lifting core-pulling mounting frame 1111, and a double-headed pushing member 111 disposed on the lifting drive cylinder 1112. 3. The inclined push slide rail sliders 1114 and the edge protruding core-pulling rods 1115 that are slidably engaged with the upper inclined slide rail of the inclined push slide rail sliders 1114 are respectively set at both ends of the double-headed push component 1113. When pulling the core, the lifting drive cylinder 1112 drives the inclined push slide rail sliders 1114 to retract and reset, and the edge protruding core-pulling rods 1115 descend vertically along the inclined slide rail to complete the core pulling. The two ends of the double-headed push component 1113 correspond to one of the handle injection molding lower inner molds 211.

[0056] In this embodiment, the inclined inner bottom core-pulling module 112 includes an inclined base 1121 and an injection molded part cavity forming core-pulling rod 1122 fixed in the inclined base 1121 and extending obliquely into the inner mold 211 of the handle injection molding. The two inclined inner bottom core-pulling modules 112 correspond to one inner mold 211 of the handle injection molding.

[0057] This invention also provides a composite core-pulling method for a multi-level composite core-pulling handle injection mold, comprising the following steps:

[0058] S1. Mold opening starts, and the two sets of composite angle core-pulling components 32 located on the left and right sides of the mold move synchronously: the limiting core-pulling blocks 326 in each set are first pulled out in the vertical direction, releasing the limitation on the composite core-pulling block 325; then the external drive mechanism pushes the composite core-pulling block 325 to move linearly, and the linear motion is decomposed and converted into synchronous composite core-pulling motion that drives the first angled pull rod 321 and the second angled pull rod 322 to move along their respective angled trajectories through the first connecting key 323 and the second connecting key 324, thereby simultaneously completing the core-pulling and demolding of the plastic parts with lateral composite angle features in the left and right injection cavities;

[0059] S2. The two sets of composite avoidance core-pulling components 22 located on the left and right sides of the mold start core pulling simultaneously: the first inclined hydraulic cylinder pushing mechanism 2212 of each set drives the first four-axis linkage external pulling mechanism 2211 to move in sequence according to a preset order, thereby driving the middle core-pulling component 22151, the internal core-pulling component 22152, the bottom core-pulling component 22153 and the top inclined core-pulling component 22154 to complete the multi-directional sequential core pulling action of the corresponding area of ​​the first external pulling inclined core-pulling module 221 on that side;

[0060] S3. After the first external pulling and tilting module 221 in both sets of composite avoidance core-pulling assemblies 22 has completed core-pulling, the avoidance drive module 223 of each set synchronously drives its first external pulling and tilting module 221 to move laterally away from the second external pulling and tilting module 222 in the same set, thus completing spatial avoidance.

[0061] S4. Subsequently, the second external pull-angle pulling module 222 in the two sets of composite avoidance core pulling components 22 synchronously starts core pulling: the second oblique oil cylinder pushing mechanism 2222 of each set drives the second four-axis linkage external pull mechanism 2221 to act in a preset sequence, and completes the multi-directional sequential core pulling action of the corresponding area of ​​the second external pull-angle pulling module 222 on that side.

[0062] S5. The dual-station bottom core-pulling assembly 11 is activated, simultaneously acting on the left and right injection cavities: its lifting drive cylinder 1112 drives the inclined push slide rail slider 1114 to retract and reset, causing the edge protruding core-pulling rod 1115 to descend vertically along the inclined slide rail to complete the core pulling; at the same time, the core-pulling rod 1122 of the injection molded part is pulled out obliquely; thus, the composite core pulling and demolding of the bottom of the left and right handle plastic parts is completed simultaneously.

[0063] In summary, the specific embodiments of the present invention are as follows:

[0064] During the mold opening and core pulling process, firstly, the two sets of composite angled core pulling components 32 located on the left and right sides of the mold start working simultaneously. The limiting core pulling blocks 326 in each component first pull out from the side of the composite core pulling block 325 in the vertical direction, releasing the vertical lock on the composite core pulling block 325. Subsequently, the external linear drive mechanism pushes the composite core pulling block 325 to perform a horizontal linear movement. This linear movement is transmitted and converted through the first connecting key 323 and the second connecting key 324 fixedly connected to the composite core pulling block 325. Due to the sliding of the first connecting key 323... The first inclined pull rod 321 is sleeved on the second inclined pull rod 322, and the second connecting key 324 is slidably sleeved on the second inclined pull rod 322. The two inclined pull rods are obliquely set on both sides of the injection groove at a specific angle. Therefore, the horizontal linear motion of the composite core-pulling block 325 is decomposed and converted into synchronous and coordinated linear motion that drives the first inclined pull rod 321 and the second inclined pull rod 322 to move along their own preset oblique trajectories. This allows the core-pulling rods of both to be smoothly pulled out from the composite angle side hole of the plastic part, and the demolding of the lateral composite angle features of the plastic part in the left and right injection cavities is completed simultaneously.

[0065] Next, the two sets of composite avoidance core-pulling assemblies 22 located on the left and right sides of the mold simultaneously start their first stage of core-pulling action. The first inclined hydraulic cylinder push mechanism 2212 in each assembly starts to work, driving the first four-axis linkage external pull mechanism 2211 connected to it. Inside the first four-axis linkage external pull mechanism 2211, the power is first transmitted to the first external pull component 22141 of the external pull drive module 2214, causing it to move away from the mold core along the guide rod 22132 of the guide limit module 2213, and driving the middle core-pulling component 22151 fixedly connected to the first external pull component 22141 to pull the core first. When the first external pull component 22141 moves to the end of its stroke relative to the second external pull component, After the point, the power is sequentially transmitted to the second pull component 22142, causing it to move together with the first pull component and drive the internal core-pulling component 22152 to pull the core. Similarly, the third pull component 22143 and the fourth pull component 22144 are triggered in sequence, driving the bottom core-pulling component 22153 and the top inclined core-pulling component 22154 to complete the core-pulling action, respectively. During this process, the guide and limit component 22145 of the pull drive module 2214 coordinates the movement sequence, and its secondary layered limit inclined slide 221491 and other structures will ensure that each component can be accurately and sequentially reset during subsequent mold closing. Thus, the two sets of first pull inclined core-pulling modules 221 synchronously complete the multi-directional sequential core pulling of their respective areas.

[0066] After the first external pulling oblique pulling module 221 in both sets of composite avoidance core pulling assemblies 22 has completed all its core pulling actions, the avoidance drive modules 223 of each set are started synchronously. The external push avoidance cylinder 2232 outputs linear thrust through the external push guide on the slide rail base plate 2231, driving the first external pulling oblique pulling module 221 installed on the upper end of the slide rail base plate 2231 to move laterally on the horizontal plane perpendicular to its original core pulling direction, so that it moves away from the second external pulling oblique pulling module 222 in the same group, thereby making enough space for the subsequent core pulling action of the second external pulling oblique pulling module 222 and effectively avoiding motion interference.

[0067] After the space avoidance is completed, the second external pull angled pulling mold group 222 in the two sets of composite avoidance core pulling components 22 synchronously starts core pulling. The second angled oil cylinder push mechanism 2222 of each group starts to work, driving the second four-axis linkage external pull mechanism 2221 connected to it. The internal working principle of the second four-axis linkage external pull mechanism 2221 is the same as that of the first four-axis linkage external pull mechanism 2211. Its external pull drive module moves in sequence according to the preset mechanical sequence, driving the core pulling parts connected to each external pull component to complete the multi-directional sequential core pulling and demolding of another symmetrical area of ​​the plastic part.

[0068] Finally, the dual-station bottom-pull core-pulling assembly 11 is activated, simultaneously pulling the cores from the bottom of the left and right injection cavities. The lifting drive cylinder 1112 retracts, driving the double-headed pusher 1113 and the inclined pusher slide rail slider 1114 at both ends to move downwards to reset. The downward movement of the inclined pusher slide rail slider 1114 forces the edge protruding core-pulling rod 1115, which is slidably fitted on it, to move vertically downwards, thereby disengaging it from the undercut edge of the bottom of the plastic part. At the same time, the core-pulling rod 1122, which is fixed in the inclined puller base 1121, is pulled out in a straight line along its fixed inclined angle by a tool, disengaging from the undercut edge of the bottom of the plastic part. Through this series of synchronous and coordinated actions, the dual-station bottom-pull core-pulling assembly 11 simultaneously completes the composite core-pulling and demolding of all the complex features of the bottom of the left and right handle plastic parts. At this point, the entire handle plastic part is completely removed from the mold.

[0069] The above description is merely the optimal embodiment of the present invention and is not intended to limit the present invention. Any modifications or substitutions made by those skilled in the art without departing from the essence and scope of protection of the present invention should also be within the scope of protection of the present invention.

Claims

1. A multi-level composite core-pulling handle injection mold, characterized in that: The system includes a supporting base (1), a lower mold mechanism (2) disposed on the upper end of the supporting base (1), and an upper mold mechanism (3) cooperating with the upper end of the lower mold mechanism (2). The upper mold mechanism (3) and the lower mold mechanism (2) together define two independent injection cavities symmetrically distributed to the left and right. The lower mold mechanism (2) includes a lower inner mold assembly (21) and two sets of composite clearance core-pulling assemblies (22) located on both sides of the lower inner mold assembly (21). Each set of composite clearance core-pulling assemblies (22) corresponds to one injection cavity. The lower inner mold assembly (21) includes two symmetrically arranged handle injection lower inner molds (211). The upper mold mechanism (3) includes an upper inner mold assembly (31) and two sloping lower inner molds located on both sides of the upper end of the upper inner mold assembly (31). Two sets of composite angled core-pulling assemblies (32) are connected through each other. Each set of composite angled core-pulling assemblies (32) corresponds to one injection molding cavity. The supporting base (1) includes a double-station bottom core-pulling assembly (11) located in the middle. Each set of composite avoidance core-pulling assemblies (22) includes a first external pull angled core-pulling module (221) and a second external pull angled core-pulling module (222) arranged in a figure-eight closed distribution along the extraction direction and symmetrically arranged with each other, as well as an avoidance driving module (223) driven by the first external pull angled core-pulling module (221). After the first external pull angled core-pulling module (221) completes core-pulling, the avoidance driving module (223) drives the first external pull angled core-pulling module (221) to move away from the second external pull angled core-pulling module (222) to avoid it. The first external pull-out module (221) includes a first four-axis linkage external pull mechanism (2211) and a first inclined hydraulic cylinder pushing mechanism (2212) disposed at the outer end of the first four-axis linkage external pull mechanism (2211). The second external pull-out module (222) includes a second four-axis linkage external pull mechanism (2221) symmetrically disposed with the first four-axis linkage external pull mechanism (2211) and a second inclined hydraulic cylinder pushing mechanism (2222) disposed below the second four-axis linkage external pull mechanism (2221).

2. The multi-level composite core-pulling handle injection mold according to claim 1, characterized in that: The upper inner mold assembly (31) includes two symmetrically arranged handle injection upper inner molds (311). Each of the composite angle core-pulling assemblies (32) includes a composite angle core-pulling unit movably arranged in the handle injection upper inner mold (311). The composite angle core-pulling unit includes a first angled pull rod (321) and a second angled pull rod (322) respectively angledly arranged on both sides of the injection groove, a first connecting key (323) slidably sleeved on the first angled pull rod (321) and a second connecting key (324) slidably sleeved on the second angled pull rod (322), a composite core-pulling block (325) fixedly connected to the first connecting key (323) and the second connecting key (324), and a limiting core-pulling block (326) that is vertically slidably engaged with the outer wall of the composite core-pulling block (325).

3. The multi-level composite core-pulling handle injection mold according to claim 2, characterized in that: The first four-axis linkage external pulling mechanism (2211) includes a guide limiting module (2213), an external pulling drive module (2214), and an inclined pulling core pulling module (2215). The guide limiting module (2213) includes an external pulling limiting frame (22131) and a plurality of guide rods (22132) connected to the inner sides of both ends of the external pulling limiting frame (22131). The external pulling drive module (2214) includes a first external pulling component (22141) and a second external pulling component that are slidably sleeved on the guide rods (22132) from the outside to the inside. The oblique pull core module (2215) includes a middle core pull member (22151) connected to the first external pull member (22141), an inner core pull member (22152) connected to the second external pull member (22142), a bottom core pull member (22153) connected to the third external pull member (22143), and a top oblique core pull member (22154) connected to the fourth external pull member (22144).

4. The multi-level composite core-pulling handle injection mold according to claim 3, characterized in that: The external pull drive module (2214) further includes a guide limiting component (22145), which includes a first external pull guide limiting member (22146) fixedly connected to the first external pull component (22141), a second external pull guide limiting member (22147) fixedly connected to the second external pull component (22142), a third external pull guide limiting member (22148) fixedly connected to the third external pull component (22143), and a fourth external pull guide limiting member (22149) fixedly connected to the fourth external pull component (22144). A first external pull guide rod (221461) is provided on the first external pull guide limiting member (22146). The second pull guide limiter (22147), the third pull guide limiter (22148), and the fourth pull guide limiter (22149) are slidably fitted onto the first pull guide rod (221461) in sequence. The fourth pull guide limiter (22149) has a secondary layered limiting inclined slide (221491) on one side away from the fourth pull component (22144) along the core-pulling direction. The secondary layered limiting inclined slide (221491) includes a first inclined limiting slide that contacts the second pull guide limiter (22147) and a second inclined limiting slide that contacts the third pull guide limiter (22148).

5. The multi-level composite core-pulling handle injection mold according to claim 1, characterized in that: The avoidance drive module (223) includes a slide rail base plate (2231) and an outward avoidance cylinder (2232) mounted below the slide rail base plate (2231). The first outward pull-out module (221) is installed on the upper end of the slide rail base plate (2231). The slide rail base plate (2231) is provided with an outward push guide port that is perpendicular to the core pulling direction on the horizontal plane of the first outward pull-out module (221). The output end of the outward avoidance cylinder (2232) is connected to the first outward pull-out module (221) through the outward push guide port.

6. The multi-level composite core-pulling handle injection mold according to claim 2, characterized in that: The upper end of the lower inner mold (211) of the handle injection molding cooperates with the lower end of the upper inner mold (311) of the handle injection molding, and together they form the core cavity part of each injection cavity for molding the handle grip in the mold-closed state. The core-pulling end of the composite avoidance core-pulling assembly (22) extends into the injection cavity in the mold-closed state.

7. The multi-level composite core-pulling handle injection mold according to claim 3, characterized in that: The dual-station bottom-pulling core-pulling assembly (11) includes lifting and pushing core-pulling modules (111) symmetrically arranged on both sides of the lower inner mold assembly (21) and two inclined inner bottom-pulling core-pulling modules (112) located at both ends between the two lifting and pushing core-pulling modules (111). The lifting and pushing core-pulling module (111) includes a lifting core-pulling mounting frame (1111), a lifting drive cylinder (1112) installed at the lower end of the lifting core-pulling mounting frame (1111), and a double-headed pushing component (1113) disposed on the lifting drive cylinder (1112). The inclined push slide rail slider (1114) is respectively set at both ends of the double-headed push component (1113), and the edge protruding core-pulling rod (1115) is slidably engaged with the upper inclined slide rail of the inclined push slide rail slider (1114). When pulling the core, the lifting drive cylinder (1112) drives the inclined push slide rail slider (1114) to retract and reset, and the edge protruding core-pulling rod (1115) descends vertically along the inclined slide rail to complete the core pulling. The two ends of the double-headed push component (1113) correspond to one of the handle injection molding lower inner molds (211).

8. The multi-level composite core-pulling handle injection mold according to claim 7, characterized in that: The inclined inner bottom core-pulling module (112) includes an inclined base (1121) and an injection molded inner cavity core-pulling rod (1122) fixed in the inclined base (1121) and extending obliquely into the inner mold (211) of the handle injection molding. The two inclined inner bottom core-pulling modules (112) correspond to one of the inner molds (211) of the handle injection molding.

9. A composite core-pulling method for a handle injection mold based on the multi-level composite core-pulling method of claim 8, characterized in that, Includes the following steps: S1. Mold opening starts, and the two sets of composite angle core-pulling components (32) located on the left and right sides of the mold move synchronously: the limiting core-pulling block (326) in each set is first pulled out in the vertical direction to release the limitation on the composite core-pulling block (325); then the external drive mechanism pushes the composite core-pulling block (325) to move in a straight line. The straight line movement is decomposed and converted into synchronous composite core-pulling movement that drives the first angled pull rod (321) and the second angled pull rod (322) to move along their respective angled trajectories through the first connecting key (323) and the second connecting key (324), thereby simultaneously completing the core-pulling and demolding of the plastic parts with lateral composite angle features in the left and right injection cavities; S2. The two sets of composite avoidance core-pulling components (22) located on the left and right sides of the mold start core-pulling synchronously: the first inclined hydraulic cylinder push mechanism (2212) of each set drives the first four-axis linkage external pull mechanism (2211) to move in sequence according to a preset order, driving the middle core-pulling component (22151), the internal core-pulling component (22152), the bottom core-pulling component (22153) and the top inclined core-pulling component (22154) to complete the multi-directional sequential core-pulling action of the corresponding area of ​​the first external pull inclined core-pulling module (221) on that side; S3. After the first external pulling and tilting module (221) in both sets of composite avoidance core pulling components (22) has completed core pulling, the avoidance drive module (223) of each set synchronously drives its first external pulling and tilting module (221) to move laterally in a direction away from the second external pulling and tilting module (222) in the same set, so as to complete spatial avoidance; S4. Subsequently, the second external pull-angle pulling module (222) in the two sets of composite avoidance core pulling components (22) synchronously start core pulling: the second oblique oil cylinder push mechanism (2222) of each set drives the second four-axis linkage external pull mechanism (2221) to act in a preset sequence to complete the multi-directional sequential core pulling action of the corresponding area of ​​the second external pull-angle pulling module (222) on that side; S5. The dual-station bottom core-pulling assembly (11) is activated and acts on the left and right injection cavities simultaneously: its lifting drive cylinder (1112) drives the inclined push slide rail slider (1114) to retract and reset, so that the edge protruding core-pulling rod (1115) descends vertically along the inclined slide rail to complete the core pulling; at the same time, the core-pulling rod (1122) of the injection molded part is pulled out obliquely; thus, the composite core pulling and demolding of the bottom of the left and right handle plastic parts is completed simultaneously.

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