A container shell injection mold
Patent Information
- Application Number
- CN202611420433.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-14
- Publication Date
- 2026-10-16
AI Technical Summary
[0003]现有传统容器外壳注塑模具在生产带有侧壁外凸倒扣的塑件时，普遍采用外置液压抽芯油缸配合独立滑块铲基机构完成倒扣脱模，该结构需在模具侧向预留较大安装空间，致使模架整体尺寸增大、结构臃肿；同时脱模工序采用分步执行模式：需先启动液压油缸完成侧向抽芯、避让塑件倒扣，待抽芯动作完全结束后，方可启动注塑机顶出机构进行顶出脱模；两道动作时序相互独立，存在明显的油缸动作等待时间，延长单模成型周期，降低单位时间产品产出效率；且容器外壳属于深腔薄壁类塑件，型芯与塑件贴合包裹面积大，塑料冷却收缩后对型芯产生较强抱紧包紧力，仅依靠一级同步顶出结构，顶出力与顶出行程有限，难以克服较大脱模阻力，容易出现塑件粘模、脱模不完全、取件困难等问题，生产稳定性与产品成型质量较差
[0018] The push plate drives the inclined slide block and guide rod to move upwards synchronously, and the inverted core pulling and initial ejection are completed simultaneously, eliminating the need for a separate core pulling waiting process and shortening the molding cycle. The additional lifting force is generated by the triangular inclined surface extrusion of the horizontal and vertical inclined blocks, and the secondary lifting is achieved within a single ejection stroke of the same push plate, eliminating the need for double push plates and secondary ejection cylinders. This overcomes the large-area clamping force of the core and improves the smoothness of demolding.
Smart Images
Figure CN122914458A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of injection mold technology, specifically to an injection mold for a container shell. Background Technology
[0002] Container shells specifically refer to the external shell components of various containers, including small household appliance shells and energy storage battery shells. Container shell injection molds are specialized metal forming tools used in injection molding processes to produce protective shells for various hollow and shell-type containers. By relying on an injection molding machine to inject molten plastic under high pressure into the mold cavity, and after cooling, a complete and dimensionally accurate container shell plastic part is obtained. It is the core process equipment for mass production of plastic container shells.
[0003] Traditional container shell injection molds commonly employ external hydraulic core-pulling cylinders in conjunction with independent sliding block shovel mechanisms to demold the undercuts when producing plastic parts with protruding sidewalls. This structure requires a large installation space on the side of the mold, resulting in an increased overall mold frame size and a bulky structure. Furthermore, the demolding process is executed in stages: the hydraulic cylinder must first be activated to pull the core laterally and avoid the undercuts; only after the core-pulling action is complete can the injection molding machine's ejection mechanism be activated for ejection. These two actions are independent of each other, resulting in significant cylinder waiting time, extending the single-mold molding cycle and reducing product output efficiency per unit time. Moreover, container shells are deep-cavity, thin-walled plastic parts with a large area of contact between the core and the part. After the plastic cools and shrinks, it exerts a strong clamping force on the core. Relying solely on a single-stage synchronous ejection structure results in limited ejection force and stroke, making it difficult to overcome significant demolding resistance. This easily leads to problems such as part sticking to the mold, incomplete demolding, and difficulty in removing the part, resulting in poor production stability and product molding quality. Summary of the Invention
[0004] The purpose of this invention is to provide an injection mold for container shells to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a container shell injection mold, comprising a mold foot, an ejector plate, and a core fixing plate. The ejector plate is connected to the inner wall of the mold foot, and a core fixing plate is connected to one side of the outer wall of the mold foot. A cavity fixing plate is connected to one side of the outer wall of the core fixing plate, and a cavity fixing plate is connected to the side of the cavity fixing plate away from the core fixing plate. A left-lobed female mold core is installed on one side of the inner wall of the cavity fixing plate, and a right-lobed female mold core is installed on the other side of the inner wall. Positioning strips are connected to both sides of the outer walls of the left-lobed and right-lobed female mold cores, and a sprue panel is inserted into the center of each top. The core fixing plate... A core body is installed inside the plate. A slanted top slider is slidably connected to one side of the core body, and a guide rod is slidably connected to the other side. A shell mold is sleeved on the outer wall of the core body. An ejector is slidably connected to the top of the guide rod. A forming block is fixedly connected to the top of the slanted top slider. A guide slope is opened on one side of the middle of the slanted top slider, and a groove is opened on the other side. A guide slope is opened on the side of the core body near the slanted top slider. A horizontal inclined block is connected to the top of the groove. A vertical inclined block is connected to one side of the bottom of the ejector. A storage groove is opened on the top of the guide rod near the vertical inclined block.
[0006] Preferably, the push plate is used to drive the inclined push slider and the guide rod to move linearly, and the inclined push slider and the push plate are slidably connected. The guide slope can cooperate with the guide slope to drive the inclined push slider to move linearly and move closer to the guide rod at the same time.
[0007] The injection molding machine's ejector roller pushes the ejector plate forward, and the ejector plate simultaneously drives the inclined ejector slider and guide rod to move vertically upward in a straight line. During the upward movement of the inclined ejector slider, its own guiding inclined surface slides and squeezes against the internal guiding inclined surface of the core body. The component force of the inclined surface pushes the inclined ejector slider to move horizontally inward along the slide groove towards the guide rod. The molding block simultaneously shrinks inward, completely disengaging from the protruding undercut on the side wall of the plastic part, releasing the undercut clamping limit, and achieving undercut avoidance.
[0008] Preferably, the groove, in conjunction with the outer wall of the guide rod, is used to guide the inclined slide block to move smoothly. The ejector is located above the inclined slide block and, in conjunction with the guide rod, is used to initially lift the outer shell mold.
[0009] Within the same stroke, the guide rods rise synchronously, coordinating with the ejector components to move upwards in sync, completing the initial first-stage ejection of the container's outer plastic parts.
[0010] Preferably, both the horizontal and vertical inclined blocks are triangular, and the horizontal inclined block can move synchronously with the inclined top slider, working in conjunction with the vertical inclined block to drive the ejector to lift the outer shell mold a second time.
[0011] Preferably, the inclined top slider and the forming block are combined in a "7" shape, the guide rod is in an "I" shape, and the storage groove is used to accommodate the horizontal inclined block.
[0012] The push plate continues to feed upwards, and the inclined slide block moves horizontally inwards to its position. The horizontal inclined block fixed on it slides synchronously into the receiving groove at the top of the guide rod. The triangular horizontal inclined block and the inclined surface of the triangular vertical inclined block at the bottom of the ejector are pressed together. The interaction of the inclined surfaces generates an upward component force, which drives the ejector to be lifted a second time relative to the guide rod, realizing the second-stage ejection.
[0013] Preferably, the top of the core body is located inside the left and right female mold cores, and the left and right female mold cores are used to form the outer wall of the outer shell mold.
[0014] The injection molding machine drives the moving mold forward, and the fixed mold plate, cavity fixing plate, and core fixing plate fit together tightly to complete the mold closing; the left and right female mold cores, core body, ejector, and molding block surround each other to form a sealed and complete container shell molding cavity.
[0015] Preferably, the core body, in conjunction with the ejector and the top of the guide rod, is used to form the inner wall of the outer shell mold, and the sprue panel is connected to the injection molding machine nozzle to introduce molten plastic into the cavity.
[0016] The injection molding machine nozzle presses against the sprue panel, and the molten plastic is injected into the closed cavity through the central sprue of the sprue panel. The plastic part solidifies and forms a container shell with a side wall convex and inverted structure, which wraps around the outside of the core body.
[0017] As can be seen from the above, the container shell injection mold provided by the present invention has the following beneficial effects.
[0018] The push plate drives the inclined slide block and guide rod to move upwards synchronously, and the inverted core pulling and initial ejection are completed simultaneously, eliminating the need for a separate core pulling waiting process and shortening the molding cycle. The additional lifting force is generated by the triangular inclined surface extrusion of the horizontal and vertical inclined blocks, and the secondary lifting is achieved within a single ejection stroke of the same push plate, eliminating the need for double push plates and secondary ejection cylinders. This overcomes the large-area clamping force of the core and improves the smoothness of demolding.
[0019] The guide rod adopts an "I" shaped structure, which combines multiple functions such as guiding, bearing, and assembling ejector parts. It is multi-functional and reduces the number of individual guide columns and support columns. In addition, the guide rod is equipped with a storage groove, which can store the horizontal inclined block when the inclined top moves inward without movement interference.
[0020] When the push plate moves downward to reset, the inclined plane automatically drives the inclined push slider back to its original position, and the ejected part relies on its own weight to fall back and be positioned. The motion mechanism does not require an additional reset spring or limit cylinder, and the reset action is synchronized. There is no manual assistance in the reset operation, and it can be paired with a robotic arm to automatically pick up parts, improving production efficiency.
[0021] By adopting a combination structure of inclined top slider and forming block, the inclined top horizontal core pulling is achieved by relying on the guide slope of the core body. There is no need for additional external core pulling cylinder and slider mechanism, which simplifies the overall layout of the mold and reduces the mold processing cost and assembly difficulty. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the left and right lobe mold cores of the present invention; Figure 3 This is a three-dimensional structural diagram of the core body, the inclined top slider, and the guide rod of the present invention; Figure 4 This is a three-dimensional structural diagram of the gating panel, core body, and outer mold of the present invention; Figure 5 This is a three-dimensional structural diagram of the core body, guide rod, and ejector of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the core body and guide slope of the present invention; Figure 7 This is a schematic diagram of the front sectional view of the core body and the outer shell mold of the present invention; Figure 8 This is a three-dimensional structural diagram of the guide rod, ejector, and molding block of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the inclined top slider, guide inclined surface, and slide groove of the present invention; Figure 10 This is a schematic diagram of the main sectional view of the inclined top slider and the ejector of the present invention; Figure 11 This is a front view cross-sectional structural diagram of the ejector in the secondary ejection state of the present invention.
[0023] In the diagram: 1. Mold foot; 2. Ejector plate; 3. Core fixing plate; 4. Cavity fixing plate; 5. Fixed template; 6. Left-lobed female mold core; 7. Right-lobed female mold core; 8. Positioning pressure strip; 9. Sprue panel; 10. Core body; 11. Angled ejector slider; 12. Guide rod; 13. Outer shell mold; 14. Ejector; 15. Molding block; 16. Guide slope; 17. Slide groove; 18. Guide slope; 19. Horizontal inclined block; 20. Vertical inclined block; 21. Storage groove. Detailed Implementation
[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0025] Please see Figures 1-11 This invention provides a technical solution: a container shell injection mold, including a mold foot 1, a push plate 2, and a core fixing plate 3. The push plate 2 is connected to the inner wall of the mold foot 1, and the core fixing plate 3 is connected to one side of the outer wall of the mold foot 1. A cavity fixing plate 4 is connected to one side of the outer wall of the core fixing plate 3. A fixed template 5 is connected to the side of the cavity fixing plate 4 away from the core fixing plate 3. A left-lobed female mold core 6 is installed on one side of the inner wall of the cavity fixing plate 4, and a right-lobed female mold core 7 is installed on the other side of the inner wall. Positioning strips 8 are connected to both sides of the outer walls of the left-lobed female mold core 6 and the right-lobed female mold core 7. A gate panel 9 is inserted into the center of the top of each of them. A core body 10 is installed inside the core fixing plate 3. The core body 10 has a slidably connected inclined top slider 11 on one side and a guide rod 12 on the other side. The outer wall of the core body 10 is fitted with an outer shell mold 13. The top of the guide rod 12 is slidably connected to an ejector 14. The top of the inclined top slider 11 is fixedly connected to a forming block 15. The inclined top slider 11 has a guide slope 16 on one side and a groove 17 on the other side. The core body 10 has a guide slope 18 on the side near the inclined top slider 11. The top of the groove 17 is connected to a horizontal inclined block 19. The bottom of the ejector 14 is connected to a vertical inclined block 20. The top of the guide rod 12 is connected to a storage groove 21 on the side near the vertical inclined block 20.
[0026] The push plate 2 is used to drive the inclined slide block 11 and the guide rod 12 to move linearly, and the inclined slide block 11 and the push plate 2 are slidably connected. The guide slope 18 can cooperate with the guide slope 16 to drive the inclined slide block 11 to move linearly and move closer to the guide rod 12 at the same time. The slide groove 17 cooperates with the outer wall of the guide rod 12 to guide the inclined slide block 11 to move smoothly. The ejector 14 is located above the inclined slide block 11. The ejector 14 cooperates with the guide rod 12 to initially lift the outer shell mold 13. The horizontal inclined block 19 and the vertical inclined block 20 are both triangular, and the horizontal inclined block 19 can follow the inclined slide block 11. The synchronous movement, in conjunction with the vertical inclined block 20, drives the ejector 14 to lift the outer shell mold 13 a second time; the inclined ejector slider 11 and the forming block 15 are combined in a "7" shape, the guide rod 12 is in an "I" shape, and the receiving groove 21 is used to accommodate the horizontal inclined block 19; the top of the core body 10 is located inside the left and right female mold cores 6 and 7, and the left and right female mold cores 6 and 7 are used to form the outer wall of the outer shell mold 13; the core body 10, in conjunction with the ejector 14 and the top of the guide rod 12, is used to form the inner wall of the outer shell mold 13, and the gate panel 9 is connected to the injection molding machine nozzle to introduce molten plastic into the cavity.
[0027] In practice, when the mold is closed, the fixed template 5, cavity fixing plate 4, and core fixing plate 3 are completely fitted together. The left and right female mold cores 6 and 7, together with the core body 10, ejector 14, and molding block 15, form a complete closed cavity. The positioning strip 8 engages and presses the left and right female mold cores 6 and 7 on both sides to prevent misalignment during injection molding. The injection nozzle presses against the sprue panel 9, and the molten plastic is injected into the cavity through the central sprue of the sprue panel 9. After cooling, it forms a container shell plastic part with convex and inverted side walls. After the injection molding pressure holding and cooling are completed, the moving template of the injection molding machine drives the moving mold to retreat as a whole. The mold opens along the parting surface, and the formed container shell plastic part wraps around the outside of the core body 10.
[0028] The injection molding machine's ejector roller pushes the ejector plate 2 forward, and the ejector plate 2 simultaneously drives the inclined ejector slider 11 and the guide rod 12 to move vertically upward. When the inclined ejector slider 11 moves upward, the outer guide slope 16 of the inclined ejector slider 11 slides and presses against the inner guide slope 18 of the core body 10. The slope component force drives the inclined ejector slider 11 to slide horizontally along the slide groove 17 towards the guide rod 12. The molding block 15 follows the inclined ejector slider 11 and retracts inward in sync, completely detaching from the undercut of the container shell plastic part side wall, completing the avoidance action. At this stage, the guide rod 12 and the ejector part 14 rise synchronously, performing initial ejection of the outer shell mold 13.
[0029] As the ejector plate 2 continues to push upward, the inclined ejector slider 11 contacts the guide rod 12 and moves synchronously with the horizontal inclined block 19 until the horizontal inclined block 19 moves into the receiving groove 21. During this process, the horizontal inclined block 19 at the upper end of the inclined ejector slider 11 contacts the vertical inclined block 20 at the bottom end of the ejector 14. The two sets of triangular inclined surfaces squeeze each other to generate a vertically upward force, which causes the ejector 14 to continue to push the outer shell mold 13 upward, and perform secondary ejection and demolding of the outer shell mold 13.
[0030] After the part is removed, the injection molding machine ejector retracts, the ejector plate 2 returns to its vertical position and the guide rod 12 moves downwards simultaneously; at the same time, the guide slope 18 of the core body 10 presses against the guide slope 16, driving the inclined ejector slider 11 to return to its horizontal position and the molding block 15 returns to the cavity molding position; after the ejector part 14 loses the slope support, it falls back and fits against the positioning surface of the core fixing plate 3, all moving parts have completed their reset, and the mold can be closed again to enter the next injection molding cycle.
[0031] This solution uses the push plate 2 to drive the inclined slide block 11 and guide rod 12 to move upwards synchronously, so that the inverted core pulling and the initial ejection are completed simultaneously, eliminating the separate core pulling waiting process and shortening the molding cycle; it uses the triangular inclined surface extrusion of the horizontal inclined block 19 and the vertical inclined block 20 to generate additional lifting force, so as to achieve secondary lifting within a single ejection stroke of the same push plate 2, without the need to set up double top plates and secondary ejection cylinders; it overcomes the large-area clamping force of the core and improves the smoothness of demolding.
[0032] The guide rod 12 adopts an "I" shaped structure, which combines multiple functions such as guiding, bearing and assembling the ejector component 14. It is multi-functional and reduces the number of individual guide columns and support columns. In addition, the guide rod 12 is equipped with a storage groove 21, which can store the horizontal inclined block 19 when the inclined top moves inward without movement interference.
[0033] When the push plate 2 moves downward to reset, the inclined plane automatically drives the inclined push slider 11 to return to its original position, and the ejector part 14 falls back to its position by its own weight. The motion mechanism does not require an additional reset spring or limit cylinder, and the reset action is synchronized. There is no manual assistance in the reset operation, and it can be equipped with a robotic arm to automatically pick up parts, thereby improving production efficiency.
[0034] By adopting a combination structure of inclined top slider 11 and forming block 15, the inclined top horizontal core pulling is achieved by relying on the guide inclined surface 18 of the core body. No additional external core pulling cylinder or slider mechanism is required, which simplifies the overall layout of the mold and reduces the mold processing cost and assembly difficulty.
[0035] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.
Claims
1. A container shell injection mold, comprising a mold foot (1), an ejector plate (2), and a core fixing plate (3), wherein the ejector plate (2) is connected to the inner wall of the mold foot (1), and the core fixing plate (3) is connected to one side of the outer wall of the mold foot (1), characterized in that: A cavity fixing plate (4) is connected to one side of the outer wall of the core fixing plate (3). A fixed template (5) is connected to the side of the cavity fixing plate (4) away from the core fixing plate (3). A left-lobed female mold core (6) is installed on one side of the inner wall of the cavity fixing plate (4), and a right-lobed female mold core (7) is installed on the other side of the inner wall. Positioning strips (8) are connected to both sides of the outer walls of the left-lobed female mold core (6) and the right-lobed female mold core (7). A gate panel (9) is inserted into the top center of each. A core body (10) is installed inside the core fixing plate (3). An inclined top slider (11) is slidably connected to one side of the core body (10), and a guide rod (12) is slidably connected to the other side of the core body (10). The outer wall of the body (10) is fitted with a shell mold (13), the top of the guide rod (12) is slidably connected to an ejector (14), the top of the inclined slide block (11) is fixedly connected to a forming block (15), and a guide slope (16) is opened on one side of the middle of the inclined slide block (11), and a groove (17) is opened on the other side. A guide slope (18) is opened on the side of the core body (10) near the inclined slide block (11), a horizontal inclined block (19) is connected to the top of the groove (17), a vertical inclined block (20) is connected to the bottom of the ejector (14), and a storage groove (21) is opened on the side of the top of the guide rod (12) near the vertical inclined block (20).
2. The container shell injection mold according to claim 1, characterized in that: The push plate (2) is used to drive the inclined slide block (11) and the guide rod (12) to move linearly, and the inclined slide block (11) and the push plate (2) are in a sliding connection. The guide slope (18) can cooperate with the guide slope (16) to drive the inclined slide block (11) to move linearly and move close to the guide rod (12) at the same time.
3. The container shell injection mold according to claim 2, characterized in that: The groove (17) and the outer wall of the guide rod (12) are used to guide the inclined slide block (11) to move smoothly. The ejector (14) is located above the inclined slide block (11). The ejector (14) and the guide rod (12) are used to initially lift the outer shell mold (13).
4. The container shell injection mold according to claim 3, characterized in that: The horizontal inclined block (19) and the vertical inclined block (20) are both triangular, and the horizontal inclined block (19) can move synchronously with the inclined top slider (11), and work with the vertical inclined block (20) to drive the ejector (14) to lift the outer shell mold (13) a second time.
5. The container shell injection mold according to claim 4, characterized in that: The inclined top slider (11) and the forming block (15) are combined in a "7" shape, the guide rod (12) is in an "I" shape, and the storage groove (21) is used to accommodate the horizontal inclined block (19).
6. The container shell injection mold according to claim 5, characterized in that: The top of the core body (10) is located inside the left-side female mold core (6) and the right-side female mold core (7), and the left-side female mold core (6) and the right-side female mold core (7) are used to form the outer wall of the outer shell mold (13).
7. The container shell injection mold according to claim 6, characterized in that: The core body (10) is fitted with the ejector (14) and the top of the guide rod (12) to form the inner wall of the outer shell mold (13). The gate panel (9) is connected to the injection nozzle of the injection molding machine to introduce molten plastic into the cavity.