Rapid demolding structure of injection mold

Abstract

The utility model discloses a quick demoulding structure of an injection mould, which comprises an injection mould main body, an upper mould base and a jacking lower mould base, the jacking lower die holder comprises a bottom plate, side plates symmetrically installed on the bottom plate, a top plate vertically connected with the tops of the side plates, an installation die plate installed on the surface of the top plate, a jacking plate attached to the bottom plate and an ejector pin assembly installed on the jacking plate. The demolding assembly comprises a stabilizing plate mounted on the surface of the mounting template and a cover plate combined and connected with the stabilizing plate; the mold is provided with a design for reducing the contact area of the forming mold and the product, during ejection demolding, the push-pull air cylinder pulls the demolding head to move, the pressure brought by the inner side wall of the stabilizing plate in the jacking process of the formed product A is reduced, meanwhile, the upwards-moving demolding plate also generates lifting acting force on the upper portion of the formed product A, rapid demolding of the formed product A is facilitated, and the product quality is improved. Demolding hindering caused by burrs and the like on the top of the formed product A is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and particularly relates to a rapid demoulding structure for an injection mold. Background Art

[0002] An injection mold is a plastic injection molding tool that injects heated molten plastic into a mold cavity and obtains a molded product after cooling and solidification. It is widely used in consumer goods, automobiles, electronics, medical care, packaging, and industrial equipment. Patent document No. 202022904418.9 discloses a mechanism for rapid demolding of injection molds. Injection molds are a conventional tool with a disclosed technical principle.

[0003] There are various ways to demold an injection mold, such as manual demolding, pneumatic demolding, hydraulic demolding, special demolding methods, and ejection demolding. Ejection demolding is a common automatic demolding method that uses a pneumatic or hydraulic device to push the plastic part out of the mold. It is suitable for small-sized and simple-structured plastic parts, such as plastic covers, plastic buttons, plastic fasteners, plastic containers, and plastic boxes. When ejecting the product, if the mold cavity surface is rough and has surface defects such as scratches, nicks, scars, and dents, the product will not be ejected smoothly. In addition, the ejected product fits tightly against the inner wall of the molding mold, and the contact area between the product and the molding mold is large. If the ejection operation is improper, the product will be subjected to the pressure of the molding mold, which will affect the ejection of the product.

[0004] When ejecting a product from a conventional injection mold, there is a problem that there is no design to reduce the contact area with the product, and the product cannot be ejected smoothly. Therefore, this application proposes a quick demoulding structure for an injection mold. Utility Model Content

[0005] The purpose of the utility model is to provide a rapid demoulding structure for an injection mold, so as to solve the problem in the above background technology that when the injection mold ejects the product, there is a design on the mold that does not reduce the contact area between the molding mold and the product.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: a rapid demoulding structure for an injection mold, comprising

[0007] The injection mold body includes an upper mold base and a lifting lower mold base. The lifting lower mold base includes a bottom plate, side plates symmetrically mounted on the bottom plate, a top plate vertically connected to the top of the side plates, a mounting template mounted on the surface of the top plate, a lifting plate fitted with the bottom plate, and an ejector pin assembly mounted on the lifting plate.

[0008] The demoulding assembly includes a stabilizing plate mounted on the surface of the mounting template, a cover plate assembled and connected to the stabilizing plate, a partition plate mounted on the inner surface of the stabilizing plate, and a demoulding plate slidably connected to the partition plate;

[0009] The moving assembly includes a connecting plate installed inside the stabilizing plate, a push-pull cylinder perpendicular to the connecting plate, and a stripping head connected to the other end of the push-pull cylinder;

[0010] The lifting transmission assembly comprises a fixed shaft installed between opposite surfaces of the stabilizing plate and staggeredly distributed, a first toothed rotating drum and a second toothed rotating drum sleeved on the outer sides of the corresponding fixed shaft.

[0011] Preferably, an active cavity is formed between the stabilizing plate and the cover plate, the connecting plate divides the active cavity into cavity a1 and cavity a2, and the push-pull cylinder and the demoulding head are located in cavity a1.

[0012] Preferably, the demoulding head includes a long strip block c1 and a trapezoidal block c2, the long strip block c1 is connected to one end of the push-pull air, the trapezoidal block c2 passes through the stabilizing plate, and the inner side wall of the stabilizing plate is flush with the surface of the trapezoidal block c2.

[0013] Preferably, a transmission rack meshingly connected to the first toothed rotating cylinder is provided on the surface of the long strip c1 of the stripping head, and the first toothed rotating cylinder is meshingly connected to the second toothed rotating cylinder.

[0014] Preferably, the stripping plate is a "U"-shaped structure, a partition bar b is provided at the center of the partition, and a fixed rack meshingly connected to the second toothed rotating drum is provided on the surface of the stripping plate.

[0015] Preferably, the ejector pin assembly includes a fixing column vertically connected to the lifting plate, a connecting piece installed outside the fixing column, an ejector pin with one end slidingly inserted into the connecting piece, and a locking stud penetrating the connecting piece.

[0016] Preferably, the top end of the fixing column located in the connecting piece is a cube structure, and an electromagnet that matches the inner wall of the connecting piece is provided on the opposite surface of the cube end of the fixing column.

[0017] Preferably, the connecting member includes a cylindrical end and a cubic end, the bottom end of the lifting pin is embedded in the cylindrical end, and the top end of the fixing column is embedded in the cubic end.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] In the utility model, the mold is designed to reduce the contact area between the molding mold and the product. During ejection and demoulding, the push-pull cylinder pulls the demoulding head to move, reducing the pressure exerted by the inner side wall of the stabilizing plate during the lifting process of the molded product A. At the same time, the upward-moving demoulding plate also generates a pulling force on the upper part of the molded product A, which is conducive to the rapid demoulding of the molded product A and avoids the occurrence of burrs on the top of the molded product A that hinder demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a structural diagram of the utility model;

[0021] Figure 2 This is a schematic cross-sectional view of the installation template of the present invention;

[0022] Figure 3 For the utility model Figure 2 A schematic diagram of the enlarged structure of the middle B part;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the stabilizing plate of the present invention;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the partition of the utility model;

[0025] Figure 6 This is a schematic diagram of the three-dimensional structure of the demoulding head of the present invention;

[0026] Figure 7 This is a schematic diagram of the main structure of the stabilizing plate of the present invention;

[0027] Figure 8 This is a schematic cross-sectional view of the connector of the present invention;

[0028] Figure 9 This is a schematic diagram of the three-dimensional structure of the connector of the present invention;

[0029] In the figure: 1. Upper mold base; 21. Bottom plate; 22. Lifting plate; 23. Side plate; 24. Top plate; 25. Mounting template; 31. Stabilizing plate; 32. Cover plate; 33. Partition plate; 34. Stripping template; 41. Connecting plate; 42. Push-pull cylinder; 43. Stripping head; 51. Fixed shaft; 52. First toothed rotating cylinder; 53. Second toothed rotating cylinder; 61. Fixed column; 62. Connecting piece; 63. Lifting pin; 64. Locking stud; 65. Electromagnet; 431. Drive rack. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figures 1 to 6The utility model provides a technical solution: a rapid demoulding structure for an injection mold, comprising an injection mold body, including an upper mold base 1, a lifting lower mold base, the lifting lower mold base comprising a bottom plate 21, side plates 23 symmetrically mounted on the bottom plate 21, a top plate 24 vertically connected to the top of the side plates 23, a mounting template 25 mounted on the surface of the top plate 24, a lifting plate 22 fitted with the bottom plate 21, and an ejector pin assembly mounted on the lifting plate 22. The above-mentioned adjacent components are combined by conventional methods (such as pins, bolts and strong glue bonding). The principle and method of demoulding the injection mold are conventional public technologies and will not be described in detail in this application.

[0033] The demoulding assembly includes a stabilizing plate 31 mounted on the surface of the mounting template 25, a cover plate 32 combined with the stabilizing plate 31, a partition plate 33 mounted on the inner surface of the stabilizing plate 31, and a demoulding plate 34 slidably connected to the partition plate 33. The stabilizing plate 31 is screwed together with the mounting template 25 and the cover plate 32 by bolts, and the partition plate 33 is screwed together with the stabilizing plate 31 by bolts. The demoulding plate 34 is limited by the partition plate 33 and fits tightly with the molded product A. When the demoulding plate 34 moves vertically upward, it generates a vertical upward pulling force on the molded product A, which facilitates demoulding of the molded product A. The size of the stabilizing plate 31 can be designed to match the actual product style and size.

[0034] The moving assembly includes a connecting plate 41 installed inside the stabilizing plate 31, a push-pull cylinder 42 perpendicular to the connecting plate 41, and a stripping head 43 connected to the other end of the push-pull cylinder 42. The connecting plate 41 is screwed together with the stabilizing plate 31 by bolts. When the push-pull cylinder 42 is in its initial extended state, the stripping head 43 is in contact with the molded product A. When the push-pull cylinder 42 is shortened, the stripping head 43 moves away from the molded product A, reducing the pressure on the molded product A during the lifting process.

[0035] The lifting transmission assembly includes a fixed shaft 51 installed in an offset distribution between the opposite surfaces of the stabilizing plate 31, a first toothed rotating drum 52 and a second toothed rotating drum 53 sleeved on the outer side of the corresponding fixed shaft 51, the fixed shaft 51 is connected to the stabilizing plate 31 through a bearing, the first toothed rotating drum 52 and the second toothed rotating drum 53 are meshed and connected, when the first toothed rotating drum 52 rotates counterclockwise along the F1 direction, the second toothed rotating drum 53 rotates clockwise along the F2 direction, and the second toothed rotating drum 53 lifts the stripping plate 34, which is conducive to the movement of the stripping plate 34.

[0036] In this embodiment, an active cavity is formed between the stabilizing plate 31 and the cover plate 32, and the connecting plate 41 divides the active cavity into cavity a1 and cavity a2. The push-pull cylinder 42 and the demoulding head 43 are located in cavity a1, which is convenient for the movement of the demoulding head 43. When the push-pull cylinder 42 is in the initial extended state, the demoulding head 43 fits with the molded product A. When the push-pull cylinder 42 is shortened, the demoulding head 43 leaves the molded product A, reducing the pressure on the molded product A during the lifting process.

[0037] In this embodiment, the demolding head 43 includes a long strip block c1 and a trapezoidal block c2. The long strip block c1 is connected to one end of the push-pull cylinder 42. The trapezoidal block c2 passes through the stabilizing plate 31, and the inner wall of the stabilizing plate 31 is flush with the surface of the trapezoidal block c2. A molding cavity D is formed between the stabilizing plate 31 and the mounting template 25. When the upper mold base 1 is matched with the stabilizing plate 31 and the film is sealed, the product in the molding cavity D is molded into a molded product A. The stabilizing plate 31, the trapezoidal block c2 and the inner wall of the mounting template 25 are in contact with the molded product A.

[0038] In this embodiment, the surface of the long strip c1 of the stripping head 43 is provided with a transmission rack 431 that is meshed with the first toothed rotating cylinder 52. The first toothed rotating cylinder 52 and the second toothed rotating cylinder 53 are meshed and connected. When the first toothed rotating cylinder 52 rotates counterclockwise along the F1 direction, the second toothed rotating cylinder 53 rotates clockwise along the F2 direction. The second toothed rotating cylinder 53 lifts the stripping plate 34, which is conducive to the movement of the stripping plate 34.

[0039] In this embodiment, the stripping plate 34 is a "U"-shaped structure, and a dividing strip b is provided at the center position of the partition 33. The stripping plate 34 is limited by the dividing strip b. The surface of the stripping plate 34 is provided with a fixed rack that is meshed with the second toothed rotating drum 53. When the second toothed rotating drum 53 rotates, the stripping plate 34 moves vertically.

[0040] Demolding steps for molded product A:

[0041] When the upper mold base 1 and the stabilizing plate 31 are aligned and the film is formed, the molding material is injected into the molding cavity D and molded into the molded product A after cooling. The stabilizing plate 31, the trapezoidal block c2 and the inner side wall of the mounting template 25 are in contact with the molded product A.

[0042] During demoulding, the push-pull cylinder 42 is in an extended initial state, and the demoulding head 43 is in contact with the molded product A. When the push-pull cylinder 42 is shortened, the demoulding head 43 leaves the molded product A, reducing the pressure on the molded product A during the lifting process.

[0043] The stripping head 43 moves and causes the first toothed rotating drum 52 in meshing connection to rotate;

[0044] When the first toothed drum 52 rotates counterclockwise along the F1 direction, the second toothed drum 53 rotates clockwise along the F2 direction, and the second toothed drum 53 lifts the stripper plate 34, which facilitates the movement of the stripper plate 34;

[0045] At the same time, the ejector assembly moves upward to vertically eject the molded product A inside the mounting template 25;

[0046] To sum up: the mold is designed to reduce the contact area between the molding mold and the product. During demoulding, the push-pull cylinder 42 pulls the demoulding head 43 to move, reducing the pressure exerted by the inner wall of the stabilizing plate 31 on the molded product A during the lifting process. At the same time, the upward-moving demoulding plate 34 also exerts a pulling force on the upper part of the molded product A, which is conducive to the rapid demoulding of the molded product A and avoids the appearance of burrs on the top of the molded product A that hinder demoulding.

[0047] Example 2

[0048] See also Figures 1 to 9 , which is the second embodiment of the present utility model. This embodiment is based on the previous embodiment. In order to facilitate the replacement of the ejector pin, the ejector pin assembly includes a fixing column 61 vertically connected to the lifting plate 22, a connecting piece 62 installed on the outside of the fixing column 61, a lifting pin 63 that slides into the connecting piece 62 at one end, and a locking stud 64 that passes through the connecting piece 62. The fixing column 61 is connected to the lifting plate 22 by bolts, and the locking stud 64 locks the lifting pin 63 with the fixing column 61 and the lifting pin 63. The top end of the fixing column 61 located in the connecting piece 62 is a cube structure, and the opposite surface of the cube end of the fixing column 61 is provided with a connecting screw. The electromagnet 65 is aligned with the inner wall of the part 62, and the electromagnet 65 is started and generates a magnetic attraction force. The electromagnet 65 magnetically attracts the connecting part 62, so that the connecting part 62 is firmly connected. The connecting part 62 includes a cylindrical end and a cube end. The bottom end of the lifting pin 63 is embedded in the cylindrical end, and the top end of the fixing column 61 is embedded in the cube end. When replacing the lifting pin 63, remove the locking screw 64, cut off the power to the electromagnet 65, and move the connecting part 62 and the lifting pin 63 downward. The ejector pin assembly is a split structure, and the style of the ejector pin 63 can be replaced to suit different products. The appropriate ejector pin 63 can be selected according to actual conditions.

[0049] In summary, when replacing the ejector pin 63 , the locking stud 64 is removed, the electromagnet 65 is powered off, and the connector 62 and the ejector pin 63 are moved downward. The ejector pin assembly is a split structure, and the style of the ejector pin 63 can be replaced.

[0050] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rapid demoulding structure for an injection mold, characterized in that: include The injection mold body comprises an upper mold base (1) and a lifting lower mold base, wherein the lifting lower mold base comprises a bottom plate (21), side plates (23) symmetrically mounted on the bottom plate (21), a top plate (24) vertically connected to the top of the side plates (23), a mounting template (25) mounted on the surface of the top plate (24), a lifting plate (22) fitted with the bottom plate (21), and an ejector pin assembly mounted on the lifting plate (22); A demoulding assembly comprises a stabilizing plate (31) mounted on the surface of a mounting template (25), a cover plate (32) assembled and connected to the stabilizing plate (31), a partition plate (33) mounted on the inner surface of the stabilizing plate (31), and a demoulding plate (34) slidably connected to the partition plate (33); The moving assembly includes a connecting plate (41) installed inside the stabilizing plate (31), a push-pull cylinder (42) perpendicular to the connecting plate (41), and a stripping head (43) connected to the other end of the push-pull cylinder (42); The lifting transmission assembly comprises a fixed shaft (51) installed between opposite surfaces of a stabilizing plate (31) and staggeredly distributed, a first toothed rotating drum (52) and a second toothed rotating drum (53) sleeved on the outer side of the corresponding fixed shaft (51).

2. The rapid demoulding structure for injection mold according to claim 1, characterized in that: An active cavity is formed between the stabilizing plate (31) and the cover plate (32), the connecting plate (41) divides the active cavity into cavity a1 and cavity a2, and the push-pull cylinder (42) and the demoulding head (43) are located in cavity a1.

3. The rapid demoulding structure for injection mold according to claim 1, characterized in that: The demoulding head (43) includes a long strip block c1 and a trapezoidal block c2. The long strip block c1 is connected to one end of the push-pull cylinder (42). The trapezoidal block c2 passes through the stabilizing plate (31), and the inner side wall of the stabilizing plate (31) is flush with the surface of the trapezoidal block c2.

4. The rapid demoulding structure for injection mold according to claim 3, characterized in that: The surface of the long strip c1 of the stripping head (43) is provided with a transmission rack (431) meshingly connected with the first toothed rotating cylinder (52), and the first toothed rotating cylinder (52) is meshingly connected with the second toothed rotating cylinder (53).

5. The rapid demoulding structure for injection mold according to claim 1, characterized in that: The stripping plate (34) is a "U"-shaped structure, a partition bar b is provided at the center of the partition (33), and a fixed rack is provided on the surface of the stripping plate (34) that is meshed with the second toothed rotating drum (53).

6. The rapid demoulding structure for injection mold according to claim 1, characterized in that: The ejector pin assembly comprises a fixing column (61) vertically connected to the ejection plate (22), a connecting piece (62) installed outside the fixing column (61), an ejector pin (63) with one end slidingly inserted into the connecting piece (62), and a locking stud (64) passing through the connecting piece (62).

7. The rapid demoulding structure for injection mold according to claim 6, characterized in that: The top end of the fixing column (61) located in the connecting piece (62) is a cube structure, and an electromagnet (65) that matches the inner wall of the connecting piece (62) is provided on the opposite surface of the cube end of the fixing column (61).

8. The rapid demoulding structure for injection mold according to claim 7, characterized in that: The connecting piece (62) comprises a cylindrical end and a cubic end, the bottom end of the lifting pin (63) is embedded in the cylindrical end, and the top end of the fixing column (61) is embedded in the cubic end.

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