Fractional demolding device

Abstract

The utility model discloses a fractional demolding device. The fractional demolding device comprises a bottom plate, a top plate group arranged on the bottom plate and a fixed mold positioned above the top plate group, the top plate group is driven by a jacking mechanism penetrating through the bottom plate to move towards the fixed mold; the top plate group comprises a demolding group I and a demolding group II; an ejector sleeve pin abutting against the inner wall of the product is arranged in the first demolding set; an ejector sleeve abutting against the bottom of the product is arranged in the second demolding set, and the ejector sleeve is arranged on the periphery of the ejector sleeve needle in a sleeving mode. In the initial state, the first demolding set is attached to the bottom plate, and the top of the ejector sleeve needle and the top of the ejector sleeve are both located in the fixed mold and abut against a product. In a primary demolding state, the demolding group I is separated from the bottom plate, and the top of the ejector sleeve pin protrudes out of the fixed mold; in the demolding state again, the first demolding set is separated from the second demolding set, and the ejector sleeve moves upwards relative to the ejector sleeve needle and protrudes out of the fixed mold. The mold has the beneficial effects that the product is always stressed uniformly in the demolding process by adopting graded demolding, and meanwhile, the yield of the demolded product is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, and in particular relates to a multi-stage demolding device. Background Technology

[0002] In the field of injection molding, some injection molded products have complex structures, especially small-diameter, thin-walled, deep-cavity injection molded parts. If the mold structure disclosed in the existing patent CN218615126U, "A High-Temperature Resistant Bottle Cap Injection Mold for Easy Demolding," is used to directly eject the product in one step for undercut demolding, not only is it prone to mold collisions, but also, because other small-diameter, thin-walled, deep-cavity injection molded parts, including those in this application, have undercut structures inside, if one-step ejection demolding is used, the undercut and insert may be too tightly connected, leading to damage to the product or mold during forced demolding, affecting product quality and mold lifespan, which is detrimental to improving the product's market competitiveness and resulting in low production efficiency.

[0003] To address the aforementioned problems, designing a multi-stage demolding device is an important technical issue that those skilled in the art need to solve. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a multi-stage demolding device.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A multi-stage demolding device includes a base plate, a top plate assembly disposed on the base plate, and a fixed mold located above the top plate assembly. The top plate assembly is driven to move towards the fixed mold by a lifting mechanism penetrating the base plate. The top plate assembly includes a demolding group one and a demolding group two. A ejector pin that abuts against the inner wall of the product is disposed in demolding group one. An ejector sleeve that abuts against the bottom of the product is disposed in demolding group two, and the ejector sleeve is sleeved around the outer periphery of the ejector pin. In the initial state, demolding group one is in contact with the base plate, and the tops of the ejector pin and the ejector sleeve are both located within the fixed mold and abut against the product. In the first demolding state, demolding group one separates from the base plate, and the top of the ejector pin protrudes from the fixed mold. In the second demolding state, demolding group one separates from demolding group two, and the ejector sleeve moves upward relative to the ejector pin and protrudes from the fixed mold.

[0007] Preferably, the demolding assembly includes a first top plate, a second top plate, and a wedge block; the two sides of the first top plate and the second top plate are connected by a connecting block; the wedge block passes through the connecting block and is retractably mounted on the second top plate.

[0008] Preferably, the bottom plate is connected to two fixed blocks at both ends, and the inner wall of the fixed block is formed with a wedge-shaped structure that cooperates with the wedge-shaped block; in the initial state, the wedge-shaped block is located below the wedge-shaped structure; in the initial demolding state and the subsequent demolding state, the end face of the wedge-shaped block abuts against the inner end face of the fixed block.

[0009] Preferably, the bottom plate, the first top plate, and the second top plate are each provided with a set of through holes to facilitate the passage of the drive shaft of the lifting mechanism.

[0010] Preferably, the bottom of the ejector pin is fixed to the upper surface of the first top plate, and its top penetrates the second top plate; and the ejector pin is centrally located between a set of through holes.

[0011] Preferably, the second demolding assembly includes a third top plate and a fourth top plate; both ends of the two are fixedly connected by a movable block; the movable block is sleeved on the outer periphery of the fixed block and moves up and down relative to the fixed block; the inner wall of the movable block is provided with a protrusion that abuts against the lower surface of the wedge block, and drives the wedge block to move up and down synchronously; in the initial state, the protrusion is located below the wedge structure and abuts against the lower surface of the wedge block; in the first demolding state, the protrusion is located at the wedge structure and abuts against the lower surface of the wedge block; in the second demolding state, the protrusion is located above the wedge structure and disengages from the wedge block and the fixed block.

[0012] Preferably, the bottom of the ejector sleeve is fixed to the upper surface of the third top plate, and its top penetrates the fourth top plate; a fixed mold hole with a diameter equivalent to the outer diameter of the ejector sleeve body is formed in the fixed mold.

[0013] Preferably, in the initial state, there is a gap of 32±2mm between the top plate assembly and the fixed mold; in the first demolding state, there is a gap of 12±2mm between the top plate assembly and the bottom plate; and in the second demolding state, there is a gap of 22±2mm between the first demolding assembly and the second demolding assembly.

[0014] The advantages of this utility model's technical solution are mainly reflected in:

[0015] Separating the top plate assembly from the bottom plate achieves demolding of the main body of the product. Then, separating demolding assembly two from demolding assembly one achieves demolding of the product's inverted structure. Using multiple demolding steps ensures that the product is always subjected to uniform force during the demolding process, while also ensuring the yield rate of the product after demolding.

[0016] By having the ejector pin and ejector sleeve abut against the inside and bottom of the product respectively, and applying force to the two parts of the product during the lifting process, the product is ensured to be subjected to uniform force during the initial demolding process, and the integrity of the internal undercut structure is also ensured during the second demolding process, thereby ensuring the yield rate of the product after demolding.

[0017] The moving block drives the wedge block to move relative to the fixed block, and the wedge block gradually retracts during the displacement until it abuts against the inner end face of the fixed block, realizing the initial demolding action and completing the demolding of the main body of the product. After the initial demolding, the wedge block gradually separates from the fixed block during the second demolding process, realizing the second demolding action and completing the demolding of the undercut part of the product. According to the product's structural characteristics, the different parts of the product are demolded in stages to ensure that the product or mold is not damaged during demolding, thereby improving product quality and mold life. Attached Figure Description

[0018] Figure 1 : An initial perspective view of a preferred embodiment of the present invention;

[0019] Figure 2 : A front view of the initial state of a preferred embodiment of this utility model;

[0020] Figure 3 : Initial state cross-sectional view of the preferred embodiment of this utility model;

[0021] Figure 4 : Front view of the initial demolding state of the preferred embodiment of this utility model;

[0022] Figure 5 : Cross-sectional view of the preferred embodiment of this utility model in the initial demolding state;

[0023] Figure 6 : A front view of the preferred embodiment of this utility model in the state of demolding again;

[0024] Figure 7 : Cross-sectional view of the preferred embodiment of this utility model in the state of demolding again. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] This utility model discloses a multi-stage demolding device, such as... Figure 1 As shown, the system includes a base plate 1, a top plate assembly 2 disposed on the base plate 1, and a fixed mold 3 located above the top plate assembly 2. The top plate assembly 2 is driven to move towards the fixed mold 3 by a lifting mechanism that penetrates the base plate 1. Fixed blocks 11 are connected to both ends of the base plate 1, and the inner wall of each fixed block 11 forms a wedge-shaped structure 111. Furthermore, a set of through holes 102 are formed on the main body of the base plate 1 to facilitate the passage of the drive shaft of the lifting mechanism. The lifting mechanism can be a known linear module or servo motor, or other existing structures with linear movement capabilities; therefore, its specific structure will not be described here.

[0028] like Figure 3 , Figure 5 and Figure 7 As shown, the top plate assembly 2 includes a first demolding assembly 21 and a second demolding assembly 22. The first demolding assembly 21 contains an ejector pin 41 that abuts against the inner wall of the product. The second demolding assembly 22 contains an ejector sleeve 42 that abuts against the bottom of the product, and the ejector sleeve 42 is fitted around the outer periphery of the ejector pin 41. The fixed mold 3 has a fixed mold hole 30 with a diameter equivalent to the outer diameter of the ejector sleeve 42. By having the ejector pin and ejector sleeve abut against the inside and bottom of the product respectively, and applying force to the two parts of the product during the lifting process, the product is ensured to be subjected to uniform force during the initial demolding process, and the integrity of the internal undercut structure is maintained during the subsequent demolding process, thereby ensuring a high yield rate after demolding. Initial state, as... Figures 1 to 3 As shown, the demolding assembly 21 is fitted to the base plate 1, and the tops of the ejector pin 41 and the ejector sleeve 42 are both located within the fixed mold 3 and abut against the product; in this state, there is preferably a gap of 32±2mm between the top plate assembly 2 and the fixed mold 3, and this gap is more preferably 30mm. Initial demolding state, as... Figures 4 to 5As shown, the demolding assembly 21 separates from the base plate 1, and the top of the ejector pin 41 protrudes from the fixed mold 3; and in this state, there is preferably a gap of 12±2mm between the top plate assembly 2 and the base plate 1, more preferably 10mm. In the demolding state again, as... Figures 6 and 7 As shown, the first demolding assembly 21 is separated from the second demolding assembly 22, the ejector sleeve 42 moves upward relative to the ejector pin 41 and protrudes from the fixed mold 3; and in this state, there is preferably a gap of 22±2mm between the first demolding assembly 21 and the second demolding assembly 22, and the gap is more preferably 20mm.

[0029] Furthermore, such as Figure 3 or Figure 5 or Figure 7 As shown, the demolding assembly 21 includes a first top plate 211, a second top plate 212, and a wedge block 213. Both the first top plate 211 and the second top plate 212 have a set of through holes 102 for the drive shaft of the lifting mechanism to pass through. The two sides of the first top plate 211 and the second top plate 212 are connected by a connecting block 210; the wedge block 213 passes through the connecting block 210 and is retractably mounted on the second top plate 212. In the initial state, the wedge block 213 is located below the wedge structure 111. In the initial demolding state and the subsequent demolding state, the end face of the wedge block 213 abuts against the inner end face of the fixing block 11.

[0030] Furthermore, the bottom of the ejector pin 41 is fixed to the upper surface of the first top plate 211, and its top penetrates the second top plate 212; and the second top plate 212 has a perforation corresponding to the outer contour of the ejector pin 41 to ensure the stability of the ejector pin 41 during movement. The ejector pin 41 is centrally located between a set of through holes 102.

[0031] like Figures 1 to 7 As shown, the demolding assembly 22 includes a third top plate 221 and a fourth top plate 222; both ends are fixedly connected by a moving block 223. The bottom of the ejector sleeve 42 is fixed to the upper surface of the third top plate 221, and its top penetrates the fourth top plate 222. The moving block 223 is sleeved on the outer periphery of the fixed block 11 and moves up and down relative to the fixed block 11. Specifically, the inner wall of the moving block 223 is provided with a protrusion 2231 that abuts against the lower surface of the wedge block 213, and drives the wedge block 213 to move up and down synchronously. In the initial state, as Figure 3 As shown, the protrusion 2231 is located below the wedge-shaped structure 111 and abuts against the lower surface of the wedge-shaped block 213. In the initial demolding state, as... Figure 5As shown, the protrusion 2231 is located at the wedge-shaped structure 111 and abuts against the lower surface of the wedge-shaped block 213. In the demolding state again, as... Figure 7 As shown, the protrusion 2231 is located above the wedge structure 111 and is detached from the wedge block 213 and the fixing block 11.

[0032] The multi-stage demolding device disclosed in this utility model is activated after the product injection molding is completed. The specific demolding process is as follows:

[0033] S1, the lifting mechanism is activated, and its drive shaft acts on the lower surface of the third top plate 221, driving the first top plate 211, the second top plate 212, the third top plate 221, and the fourth top plate 222 in the top plate group 2 to move synchronously 12±2mm towards the fixed mold 3. During this process, the top of the ejector sleeve 41 applies a force to the inside of the product, gradually pushing the main body of the product to move above the fixed mold 3. At the same time, the protrusion 2231 on the moving block 223 drives the wedge block 213 to move upward, thereby driving the first top plate 211 and the second top plate 212 to move upward; and during the upward movement of the second top plate 212, the wedge block 213 is forced to move inward until the end face of the wedge block 213 abuts against the end face of the wedge structure 111 of the fixed block 11, completing the initial demolding, at which point the main body of the product is separated from the fixed mold.

[0034] In step S2, the lifting mechanism continues to operate, driving the third top plate 221 and the fourth top plate 222 to move 22±2mm towards the fixed mold 3 and contact the lower surface of the fixed mold 3. Simultaneously, the first top plate 211 and the second top plate 212 remain at the position at the end of step S1. During the upward movement of the third top plate 221 and the fourth top plate 222, the moving block 223 disengages from the wedge block 213 and the fixing block 11, completing the demolding process again. At this time, the undercut portion at the bottom of the product is demolded from the fixed mold, thus completing the demolding operation.

[0035] Therefore, by moving the wedge block relative to the fixed block, and the wedge block gradually retracting during the displacement until it abuts against the inner end face of the fixed block, the initial demolding action is achieved, completing the demolding of the main body of the product, and stopping at the position after the initial demolding; during the second demolding process, the moving block gradually separates from the wedge block and the fixed block, achieving the second demolding action, completing the demolding of the undercut part of the product. According to the product's structural characteristics, the demolding of different parts of the product is carried out in stages, ensuring that the product or mold will not be damaged during demolding, improving product quality and mold life.

[0036] 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 multi-stage demolding device, comprising a base plate (1), a top plate assembly (2) disposed on the base plate (1), and a fixed mold (3) located above the top plate assembly (2); the top plate assembly (2) is driven to move toward the fixed mold (3) by a lifting mechanism penetrating the base plate (1); characterized in that: The top plate assembly (2) includes a first demolding assembly (21) and a second demolding assembly (22); the first demolding assembly (21) is provided with a sleeve pin (41) that abuts against the inner wall of the product; the second demolding assembly (22) is provided with a sleeve (42) that abuts against the bottom of the product, and the sleeve (42) is sleeved on the outer periphery of the sleeve pin (41); in the initial state, the first demolding assembly (21) is in contact with the bottom plate (1), and the tops of the sleeve pin (41) and the sleeve (42) are both located in the fixed mold (3) and abut against the product; In the initial demolding state, the demolding assembly one (21) separates from the base plate (1), and the top of the ejector pin (41) protrudes from the fixed mold (3); in the second demolding state, the demolding assembly one (21) separates from the demolding assembly two (22), and the ejector pin (42) moves upward relative to the ejector pin (41) and protrudes from the fixed mold (3).

2. The multi-stage demolding device according to claim 1, characterized in that: The demolding assembly (21) includes a first top plate (211), a second top plate (212), and a wedge block (213); the two sides of the first top plate (211) and the second top plate (212) are connected by a connecting block (210); the wedge block (213) passes through the connecting block (210) and is telescopically mounted on the second top plate (212).

3. The multi-stage demolding device according to claim 2, characterized in that: The base plate (1) is connected to two fixed blocks (11) at both ends. The inner wall of the fixed block (11) forms a wedge structure (111) that cooperates with the wedge block (213). In the initial state, the wedge block (213) is located below the wedge structure (111). In the initial demolding state and the second demolding state, the end face of the wedge block (213) abuts against the inner end face of the fixed block (11).

4. The multi-stage demolding device according to claim 3, characterized in that: A set of through holes (102) are formed on the bottom plate (1), the first top plate (211) and the second top plate (212) to facilitate the passage of the drive shaft of the lifting mechanism.

5. The multi-stage demolding device according to claim 4, characterized in that: The bottom of the ejector pin (41) is fixed to the upper surface of the first top plate (211), and its top penetrates the second top plate (212); and the ejector pin (41) is centrally located between a set of through holes (102).

6. The multi-stage demolding device according to claim 5, characterized in that: The demolding assembly 2 (22) includes a third top plate (221) and a fourth top plate (222); both ends of the two are fixedly connected by a moving block (223); the moving block (223) is sleeved on the outer periphery of the fixed block (11) and moves up and down relative to the fixed block (11); the inner wall of the moving block (223) is provided with a protrusion (2231) that abuts against the lower surface of the wedge block (213) and drives the wedge block (213) to move up and down synchronously; initial state The protrusion (2231) is located below the wedge structure (111) and abuts against the lower surface of the wedge block (213); in the initial demolding state, the protrusion (2231) is located at the wedge structure (111) and abuts against the lower surface of the wedge block (213); in the subsequent demolding state, the protrusion (2231) is located above the wedge structure (111) and is detached from the wedge block (213) and the fixing block (11).

7. The multi-stage demolding device according to claim 6, characterized in that: The bottom of the sleeve (42) is fixed to the upper surface of the third top plate (221), and its top penetrates the fourth top plate (222); a mold hole (30) with an outer diameter equivalent to that of the main body of the sleeve (42) is formed in the fixed mold (3).

8. The multi-stage demolding device according to claim 7, characterized in that: In the initial state, there is a gap of 32±2mm between the top plate group (2) and the fixed mold (3); in the first demolding state, there is a gap of 12±2mm between the top plate group (2) and the bottom plate (1); in the second demolding state, there is a gap of 22±2mm between the demolding group one (21) and the demolding group two (22).

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