Injection product demolding device
By designing a core-pulling and demolding mechanism, combined with a dovetail groove guide angled ejector, the demolding problem of the internal undercut structure of injection molded products was solved, achieving a high-quality demolding effect and reducing mold maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-04-07
AI Technical Summary
Existing technologies struggle to effectively demold the undercut structures inside injection molded products, especially when there is insufficient internal space, which can easily lead to product breakage and high mold repair costs.
Design a demolding device for injection molded products, including a core-pulling mechanism and a demolding mechanism. The core-pulling mechanism drives the insert to move. The outer demolding component and the inner demolding component work together to achieve complete demolding of the injection molded product. The dovetail groove guides the inclined ejector for inner demolding to prevent the insert from retracting during the injection molding process.
It enables complete demolding of injection molded products, improves demolding quality, prevents inserts from returning and affecting product molding, and reduces mold maintenance costs.
Smart Images
Figure CN224089581U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to injection mold technical field, especially, relate to a injection product demolding device. BACKGROUND
[0002] Injection product refers to the injection molding machine that is fused by heating plastic, then injects into the cavity of the mold, cools down, solidifies after the melt, demolding, injection molding machine injection molding product.
[0003] The general injection product does not have the reverse buckle structure inside, can directly adopt the round top needle, the top block or the push plate and can be ejected.When the injection product has the reverse buckle structure such as Figure 1 As shown, it is designed to be inclined to move and to realize multiple ejection demolding. In some injection products, the buckle position is distributed in the product interior, and the product interior space is not enough to arrange the ordinary inclined demolding mechanism. At the same time, the traditional inclined demolding mechanism also has the interference of the blasting tear line, and the product cannot be ejected at one time. If the injection product has more internal rib positions, if the ordinary internal extraction mechanism is used, the strength will be greatly discounted due to the limited internal space, and the product is easy to break, and the maintenance cost of the mold is high.
[0004] The existing patent CN215283200U, "a secondary ejection structure for demolding the product with internal reverse buckle in the mold" discloses a technical solution to solve the above problems. However, as shown in Figure 1 The structure of the injection product also forms an inclined cavity, so the technical solution cannot realize the demolding of the injection product as shown in Figure 1 Therefore, designing an injection product demolding device is an important technical problem for the present technical personnel in the field. INVENTION CONTENTS
[0005] The purpose of the utility model is to solve the above problems in the prior art, and provide an injection product demolding device.
[0006] The purpose of the utility model is realized by the following technical scheme:
[0007] The injection molding product demolding device comprises at least a core-pulling mechanism and a demolding mechanism; the core-pulling mechanism comprises at least a core-pulling cylinder and an insert arranged at the output end of the core-pulling cylinder; the demolding mechanism comprises an outer demolding assembly arranged on a fixed block and an inner demolding assembly penetrating through the fixed block; wherein the outer demolding assembly is located at the periphery of the injection molding product, the inner demolding assembly comprises at least a guide block and an inclined ejector located inside the injection molding product, and the inclined ejector penetrates through the fixed block; in the initial state, the inner wall of the outer demolding assembly abuts against the inner demolding assembly, and the insert is located between the outer demolding assembly and the inner demolding assembly; in the core-pulling state, the positions of the outer demolding assembly and the inner demolding assembly remain unchanged, the core-pulling mechanism drives the insert to move towards the position of the core-pulling cylinder until the insert is completely separated from the injection molding product; in the outer demolding state, the outer demolding assembly moves on the fixed block in the direction away from the inner demolding assembly; in the inner demolding state, the guide block drives the inclined ejector and the injection molding product to move upwards, at the same time, the inclined ejector moves towards the center of the injection molding product until the bottom surface of the injection molding product is higher than the outer demolding assembly, and a gap for demolding is formed between the injection molding product and the inclined ejector.
[0008] Preferably, the core-pulling mechanism further comprises a limiting block and a positioning block arranged at the periphery of the output end of the core-pulling cylinder; the positioning block penetrates through the limiting block and limits the moving direction of the core-pulling cylinder by the limiting block.
[0009] Preferably, the core-pulling mechanism further comprises a retreat-stopping assembly, the retreat-stopping assembly comprises a retreat-stopping cylinder arranged perpendicularly to the core-pulling cylinder and a retreat-stopping block arranged at the output end of the retreat-stopping cylinder; in the initial state, the retreat-stopping block abuts against the bottom of the positioning block and prevents the retreat-stopping block and the insert from moving towards the core-pulling cylinder; in the core-pulling state, the retreat-stopping block is driven by the retreat-stopping cylinder and moves away from the core-pulling cylinder so that the retreat-stopping block and the insert move towards the core-pulling cylinder.
[0010] Preferably, the outer demolding assembly comprises a sliding block and an outer mold core fixedly connected with the sliding block; an inclined guide column is arranged on the sliding block, the guide column drives the sliding block and the outer mold core to move to the outer demolding state; the inner contour of the outer mold core is consistent with the outer contour of the injection molding product.
[0011] Preferably, the inner demolding assembly further comprises an inner core penetrating through the fixed block and an inclined ejector positioning block fixed on the guide block; the outer wall of the inclined ejector and the periphery of the inner core fit together to form a complete circumferential surface, and the inner core is fixed on a base; a group of notches corresponding to the inclined ejector are formed in the inclined ejector positioning block, and the distance from the notches to the inner core is greater than the width of the bottom of the inclined ejector.
[0012] Preferably, the outer wall of the inner core is formed with dovetail grooves matching the inclined ejector pins; the dovetail grooves guide the inclined ejector pins during the inner demolding process, so that the group of inclined ejector pins simultaneously move towards the inner core; the top of the inner core is formed with a concave-convex structure matching the inner wall of the injection molded product.
[0013] Preferably, the outer wall of each inclined ejector pin is formed with a positioning groove clamped with the inner wall of the injection molded product, and the positioning groove is close to the top end of the inclined ejector pin; each inclined ejector pin is independently arranged.
[0014] The advantages of the technical scheme of the utility model mainly embody in:
[0015] The core pulling mechanism is used to demold the inclined cavity of the injection molded product, and then the demolding mechanism is used to demold the injection molded product, so as to ensure the complete and good demolding of the injection molded product and improve the demolding quality.
[0016] The core pulling mechanism is locked and limited by the retreat stopping assembly, so that the insert is effectively prevented from retreating under stress during the product injection molding process, and the product molding is affected.
[0017] The dovetail grooves guide the inclined ejector pins, so that the group of inclined ejector pins simultaneously move towards the inner core, so that the injection molded product is smoothly demolded. DRAWINGS
[0018] Figure 1 The product structure diagram in the background art of the utility model;
[0019] Figure 2 The three-dimensional structure diagram of the preferred embodiment of the utility model;
[0020] Figure 3 The initial state first direction sectional view of the preferred embodiment of the utility model;
[0021] Figure 4 The initial state second direction sectional view of the preferred embodiment of the utility model;
[0022] Figure 5 The core pulling state first direction sectional view of the preferred embodiment of the utility model;
[0023] Figure 6 The core pulling state second direction sectional view of the preferred embodiment of the utility model;
[0024] Figure 7 The outer demolding state first direction sectional view of the preferred embodiment of the utility model;
[0025] Figure 8 The outer demolding state second direction sectional view of the preferred embodiment of the utility model;
[0026] Figure 9 : A cross-sectional view of the preferred embodiment of this utility model in the first direction under the inner demolding state;
[0027] Figure 10 : Second cross-sectional view of the inner demolding state in the preferred embodiment of this utility model. Detailed Implementation
[0028] The purpose, advantages, and features of this utility model will be illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this utility model, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model.
[0029] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.
[0030] like Figures 2 to 10 As shown, this utility model discloses a demolding device for injection molded products, comprising at least a core-pulling mechanism 1 and a demolding mechanism 2. The core-pulling mechanism 1 includes at least a core-pulling cylinder 11 and an insert 12 disposed at the output end of the core-pulling cylinder 11. The demolding mechanism 2 includes at least an outer demolding assembly 21 disposed on a fixed block 200 and an inner demolding assembly 22 penetrating the fixed block 200. The core-pulling mechanism enables demolding of the inclined cavity on the injection molded product, and the demolding mechanism further demolds the injection molded product, ensuring complete and efficient demolding and improving demolding quality.
[0031] Combination Figure 2 , Figure 3 , Figure 5 , Figure 7 or Figure 9As shown, the core-pulling mechanism 1 further includes a limiting block 10 and a positioning block 111 disposed on the outer periphery of the output end of the core-pulling cylinder 11. The positioning block 111 passes through the limiting block 10 and restricts the movement direction of the core-pulling cylinder 11 by the limiting block 10; that is, the position of the limiting block 10 remains unchanged. The limiting block 10 can reduce the shaking of the positioning block 111 during use, thereby improving the integrity of the core-pulling structure and the smoothness of the inner wall of the cavity, and improving the core-pulling quality.
[0032] Furthermore, such as Figure 3 The core-pulling mechanism 1 further includes a backstop assembly, which includes a backstop cylinder 13 perpendicularly disposed to the core-pulling cylinder 11 and a backstop block 131 disposed at the output end of the backstop cylinder 13. In the initial state, the backstop block 131 abuts against the bottom of the positioning block 111, preventing the backstop block 131 and the insert 12 from moving towards the core-pulling cylinder 11. In the core-pulling state, the backstop block 131 is driven by the backstop cylinder 13 and moves away from the core-pulling cylinder 11, allowing the backstop block 131 and the insert 12 to move towards the core-pulling cylinder 11. The backstop assembly locks and limits the core-pulling mechanism, effectively preventing the insert from retracting under force during product injection molding, thus affecting product molding.
[0033] Combination Figure 2 and Figure 3 As shown, the outer demolding assembly 21 is located on the outer periphery of the injection-molded product. The outer demolding assembly 21 includes a slider 211 and an outer mold core 212 fixedly connected to the slider 211. A guide post is inclinedly disposed on the slider 211. An external force drives the guide post upward, and simultaneously, the guide post drives the slider 211 and the outer mold core 212 to move to the outer demolding state; that is, the outer mold core 212 disengages from the injection-molded product, completing the outer demolding operation of the injection-molded product. Furthermore, the inner contour of the outer mold core 212 is consistent with the outer contour of the injection-molded product.
[0034] like Figure 4 , Figure 6 , Figure 8 and Figure 10 As shown, the internal demolding assembly 22 includes at least a guide block 221 and an inclined ejector 222 located inside the injection-molded product, with the inclined ejector 222 penetrating the fixing block 200. There is one set of inclined ejectors 222, and their specific number can be adjusted according to usage requirements, without being specifically limited here. Each inclined ejector 222 is independently configured, meaning that each inclined ejector 222 can be replaced or reduced independently.
[0035] The internal demolding assembly 22 further includes an inner core 223 penetrating the fixing block 200 and an inclined ejector positioning block 224 fixed to the guide block 221. Before the internal demolding state, the outer wall of the inclined ejector 222 and the outer periphery of the inner core 223 form a complete circumferential surface and are tightly fitted to the inner wall of the injection molded product. The inner core 223 is fixed to the base 225; a set of notches corresponding one-to-one with the inclined ejector 222 are formed in the inclined ejector positioning block 224, and the distance from the notch to the inner core 223 is greater than the bottom width of the inclined ejector 222.
[0036] Furthermore, the inner core 223 is generally conical in shape, narrower at the top and wider at the bottom, with a dovetail groove on its outer wall that matches the inclined ejector 222. Of course, in other embodiments, the inner core 223 can also be columnar or other shapes, which can be adjusted according to the internal structure of the injection molded product and are not limited here. During the internal demolding process, the dovetail groove guides the inclined ejector 222, causing a group of inclined ejectors 222 to move simultaneously towards the inner core 223; the top of the inner core 223 has a concave-convex structure that matches the inner wall of the injection molded product.
[0037] like Figure 10 As shown, each of the inclined ejector members 222 has a positioning groove 220 formed on its outer wall to engage with the inner wall of the injection molded product, and the positioning groove 220 is located near the top of the inclined ejector member 222. The positioning groove 220's fit against the inner wall of the injection molded product ensures complete molding of the product and improves injection molding quality.
[0038] In the initial state, the inner wall of the outer demolding component 21 abuts against the inner demolding component 22, and respectively against the inner and outer walls of the injection molded product; and the insert 12 is located between the outer demolding component 21 and the inner demolding component 22. At this time, the bottom of the inclined ejector 222 abuts against the inner wall of the inclined ejector positioning block 224, the top of the inclined ejector 222 penetrates the fixing block 200, and together with the outer wall of the inner core 223, forms a smooth circumferential surface. The bottom end of the positioning block 111 abuts against the top surface of the anti-reverse block 131.
[0039] In the core-pulling state, the positions of the outer demolding component 21 and the inner demolding component 22 remain unchanged. The core-pulling mechanism 1 is activated, causing the insert 12 to move towards the position of the core-pulling cylinder 11 within the range defined by the limiting block 10, until the insert 12 is completely detached from the injection-molded product. Before activating the core-pulling mechanism 1, the anti-reverse component must be activated. This is achieved by activating the anti-reverse cylinder 13 and moving the anti-reverse block 131 away from the output end of the core-pulling cylinder 11, until the distal end of the anti-reverse block 131 is misaligned with the bottom of the positioning block 111, providing retraction space for the insert 12 and the positioning block 111.
[0040] In the external demolding state, after the core-pulling state, the external demolding component 21 moves away from the internal demolding component 22 on the fixed block 200; specifically, the slider 211 moves away from the outer periphery of the injection molded product under the drive of the guide column, and at the same time drives the outer mold core 212 to move synchronously until the inner wall of the outer mold core 212 is completely separated from the injection molded product.
[0041] In the internal demolding state, after the external demolding state, the guide block 221 drives the inclined ejector 222, the inclined ejector positioning block 224 and the injection molded product to move upward. At the same time, the inclined ejector 222 moves towards the center of the injection molded product under the action of the dovetail groove structure until the bottom surface of the injection molded product is higher than the external demolding assembly 21, and a gap is formed between the injection molded product and the inclined ejector 222 to facilitate demolding.
[0042] This utility model has many other embodiments. All technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this utility model.
Claims
1. A demolding device for injection molded products, characterized in that: The system includes at least a core-pulling mechanism (1) and a demolding mechanism (2); the core-pulling mechanism (1) includes at least a core-pulling cylinder (11) and an insert (12) disposed at the output end of the core-pulling cylinder (11); the demolding mechanism (2) includes an outer demolding assembly (21) disposed on a fixed block (200) and an inner demolding assembly (22) penetrating the fixed block (200); wherein, the outer demolding assembly (21) is located on the outer periphery of the injection molded product, and the inner demolding assembly (22) includes at least a guide block (221) and an inclined ejector (222) located inside the injection molded product, and the inclined ejector (222) penetrates the fixed block (200); in the initial state, the inner wall of the outer demolding assembly (21) abuts against the inner demolding assembly (22), and the insert (12) is located between the outer demolding assembly (21) and the inner demolding assembly (22). Between the inner demolding components (22); in the core-pulling state, the positions of the outer demolding component (21) and the inner demolding component (22) remain unchanged, and the core-pulling mechanism (1) drives the insert (12) to move toward the position of the core-pulling cylinder (11) until the insert (12) is completely detached from the injection molded product; in the outer demolding state, the outer demolding component (21) moves away from the inner demolding component (22) on the fixed block (200); in the inner demolding state, the guide block (221) drives the inclined ejector (222) and the injection molded product to move upward, and at the same time the inclined ejector (222) moves toward the center of the injection molded product until the bottom surface of the injection molded product is higher than the outer demolding component (21), and a gap is formed between the injection molded product and the inclined ejector (222) to facilitate demolding.
2. The demolding device for injection molded products according to claim 1, characterized in that: The core-pulling mechanism (1) further includes a limiting block (10) and a positioning block (111) disposed on the outer periphery of the output end of the core-pulling cylinder (11); the positioning block (111) passes through the limiting block (10) and the limiting block (10) restricts the movement direction of the core-pulling cylinder (11).
3. The demolding device for injection molded products according to claim 2, characterized in that: The core-pulling mechanism (1) further includes a backstop assembly, which includes a backstop cylinder (13) perpendicularly arranged to the core-pulling cylinder (11) and a backstop block (131) disposed at the output end of the backstop cylinder (13). In the initial state, the backstop block (131) abuts against the bottom of the positioning block (111) and prevents the backstop block (131) and the insert (12) from moving toward the core-pulling cylinder (11). In the core-pulling state, the backstop block (131) is driven by the backstop cylinder (13) and moves away from the core-pulling cylinder (11) so that the backstop block (131) and the insert (12) move toward the core-pulling cylinder (11).
4. The demolding device for injection molded products according to claim 3, characterized in that: The external demolding assembly (21) includes a slider (211) and an external mold core (212) fixedly connected to the slider (211); a guide post is inclinedly provided on the slider (211), and the guide post drives the slider (211) and the external mold core (212) to move to the external demolding state; the inner contour of the external mold core (212) is consistent with the outer contour of the injection molded product.
5. The demolding device for injection molded products according to claim 4, characterized in that: The inner demolding assembly (22) further includes an inner core (223) penetrating the fixing block (200) and an inclined top positioning block (224) fixed on the guide block (221); the outer wall of the inclined top (222) and the outer periphery of the inner core (223) form a complete circumferential surface, and the inner core (223) is fixed on the base (225); a set of notches corresponding one-to-one with the inclined top (222) are formed in the inclined top positioning block (224), and the distance from the notch to the inner core (223) is greater than the bottom width of the inclined top (222).
6. The demolding device for injection molded products according to claim 5, characterized in that: The outer wall of the inner core (223) has a dovetail groove that matches the inclined ejector (222); during the inner demolding process, the dovetail groove guides the inclined ejector (222), so that a group of the inclined ejectors (222) move towards the inner core (223) at the same time; the top of the inner core (223) has a concave-convex structure that matches the inner wall of the injection molded product.
7. The demolding device for injection molded products according to claim 6, characterized in that: Each of the inclined ejector (222) has a positioning groove (220) formed on its outer wall to engage with the inner wall of the injection molded product, and the positioning groove (220) is close to the top of the inclined ejector (222); each of the inclined ejector (222) is set independently.