Demolding structure for injection molding of special-shaped polyhedral workpiece

Abstract

The demolding structure comprises an injection mold and the special-shaped polyhedral workpiece, and the injection mold comprises a plate A, a plate B, a plate C, a plate D, an ejector plate, an outer demolding mechanism and an inner demolding mechanism; the plate A, the plate B, the plate C, the plate D and the ejector plate are sequentially arranged from top to bottom, a cavity is formed between the plate B and the plate C, the special-shaped polyhedral workpiece is located in the cavity, and a sequential mold opening mechanism is arranged between the ejector plate and the plate C; the outer demolding mechanism is arranged on the outer side of the special-shaped polyhedral workpiece, the outer demolding mechanism comprises four outer shovel bases and four outer sliding blocks, the inner demolding mechanism is arranged on the inner side of the special-shaped polyhedral workpiece, and the inner demolding mechanism comprises an inner shovel base, two inner sliding blocks and two inner pitched roofs. The demolding structure for injection molding of the special-shaped polyhedral workpiece is reasonable in structure, the special-shaped polyhedral workpiece with the inner side and the outer side being all-round inverted buckles can be smoothly demolded, the quality of the workpiece and smooth production are guaranteed, and the demolding structure is suitable for application and popularization.

Description

Technical Field

[0001] The invention relates to a demoulding structure for injection molding of a special-shaped polyhedron workpiece. Background Art

[0002] Injection molding is a method of producing industrial products. A mold is a tool used to make molded objects. An injection mold is a tool for producing plastic products and also a tool for giving plastic products a complete structure and precise size.

[0003] When using injection molds to produce some special-shaped polyhedron workpieces, since the inside and outside of the workpieces are all undercut, if such workpieces are demoulded according to conventional structures, normal production will not be possible, resulting in damage to the mold and scrapping of the product, resulting in great economic losses. Therefore, it is necessary to design a mold structure that can smoothly demould such special-shaped polyhedron workpieces with full circumferential undercuts on both the inside and outside. Summary of the invention

[0004] The purpose of the present invention is to provide a demoulding structure for injection molding of a special-shaped polyhedron workpiece, which has a reasonable structure and can smoothly demould the special-shaped polyhedron workpiece with full-circle undercuts on both the inside and outside, so as to ensure the quality of the workpiece and the smooth progress of production, and is suitable for popularization and application.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is to design a demoulding structure for injection molding of a special-shaped polyhedron workpiece, comprising an injection mold and a special-shaped polyhedron workpiece, wherein the injection mold comprises an A plate, a B plate, a C plate, a D plate, an ejector plate, an external demoulding mechanism and an internal demoulding mechanism; The A plate, B plate, C plate, D plate and ejector plate are arranged in sequence from top to bottom, a cavity is formed between the B plate and the C plate, the special-shaped polyhedron workpiece is located in the cavity, and a sequential mold opening mechanism is provided between the ejector plate and the C plate; The external demoulding mechanism is arranged on the outside of the special-shaped polyhedron workpiece, and the external demoulding mechanism includes four external shovel bases and four external slide blocks, the four external shovel bases are respectively fixedly connected to the A plate, the four external slide blocks are respectively slidably connected to the B plate, the four external slide blocks are arranged opposite to each other in pairs, and the four external slide blocks are respectively slidably connected to the four external shovel bases in a one-to-one correspondence through oblique guide grooves, and each of the external slide blocks is provided with an external molding portion located in the mold cavity; The inner demolding mechanism is arranged on the inner side of the special-shaped polyhedron workpiece, and the inner demolding mechanism includes an inner shovel base, two inner sliding blocks and two inner inclined tops. The bottom of the inner shovel base is fixedly connected to the D plate, and the top of the inner shovel base extends into the cavity. The two inner sliding blocks are respectively slidably connected to the C plate. The two inner sliding blocks are relatively arranged on both sides of the inner shovel base, and the two inner sliding blocks are respectively slidably connected to the top of the inner shovel base through oblique guide grooves. The two inner inclined tops are relatively arranged on the other two sides of the inner shovel base. Each of the inner inclined tops includes an inclined top seat and an inclined top rod. The bottom end of the inclined top seat is fixedly connected to the ejection plate, the bottom end of the inclined top rod is slidably connected to the top end of the inclined top seat, and the top end of the inclined top rod extends into the cavity. Each of the inner sliding blocks and each of the inclined top rods is provided with an inner molding portion located in the cavity.

[0006] Preferably, among the four outer sliding blocks, the structures of the outer forming parts relatively arranged on two outer sliding blocks are the same.

[0007] Preferably, the inner forming parts of the two inner sliding blocks have the same structure, and the inner forming parts of the two inclined lift rods have the same structure.

[0008] Preferably, a wear-resistant block is provided on the sliding contact surface between the outer shovel base and the outer sliding block.

[0009] Preferably, the injection mold further comprises a bottom plate, and the bottom plate is arranged below the ejection plate.

[0010] The advantages and beneficial effects of the present invention are: providing a demoulding structure for injection molding of a special-shaped polyhedron workpiece, which has a reasonable structure and can smoothly demould the special-shaped polyhedron workpiece with full-circle undercuts on both the inside and outside, so as to ensure the quality of the workpiece and the smooth progress of production, and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the injection mold in the present invention when the A plate and the B plate are opened.

[0012] Figure 2 Schematic diagram of the injection mold when it is fully opened in the present invention.

[0013] Figure 3 It is a schematic diagram of the injection mold of the present invention when the first stage of ejection is completed.

[0014] Figure 4 It is a schematic diagram of the injection mold of the present invention when completing the second stage of ejection.

[0015] Figure 5 It is a schematic diagram of the internal and external demoulding mechanism of the present invention.

[0016] Figure 6 It is a schematic diagram of the inner demoulding mechanism in the present invention. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] The technical solution specifically implemented in the present invention is: like Figures 1 to 6 As shown, a demoulding structure for injection molding of a special-shaped polyhedron workpiece includes an injection mold and a special-shaped polyhedron workpiece 100, wherein the injection mold includes an A plate 1, a B plate 2, a C plate 3, a D plate 4, an ejector plate 5, an external demoulding mechanism and an internal demoulding mechanism; The A plate 1, B plate 2, C plate 3, D plate 4 and ejector plate 5 are arranged in sequence from top to bottom, a cavity is formed between the B plate 2 and the C plate 3, the irregular polyhedron workpiece 100 is located in the cavity, and a sequential mold opening mechanism is provided between the ejector plate 5 and the C plate 3; The external demoulding mechanism is arranged on the outside of the special-shaped polyhedron workpiece 100, and the external demoulding mechanism includes four external shovel bases 7 and four external slide blocks 8, the four external shovel bases 7 are respectively fixedly connected to the A plate 1, and the four external slide blocks 8 are respectively slidably connected to the B plate 2, the four external slide blocks 8 are arranged opposite to each other in pairs, and the four external slide blocks 8 are respectively slidably connected to the four external shovel bases 7 in a one-to-one correspondence through oblique guide grooves, and each of the external slide blocks 8 is provided with an external molding portion 9 located in the mold cavity, and the external molding portion 9 is used to mold the outer side wall of the special-shaped polyhedron workpiece 100 and the undercut thereon; The inner demoulding mechanism is arranged on the inner side of the special-shaped polyhedron workpiece 100, and the inner demoulding mechanism includes an inner shovel base 10, two inner sliders 11 and two inner inclined tops. The bottom of the inner shovel base 10 is fixedly connected to the D plate 4, and the top of the inner shovel base 10 extends into the cavity. The two inner sliders 11 are respectively slidably connected to the C plate 3. The two inner sliders 11 are relatively arranged on both sides of the inner shovel base 10, and the two inner sliders 11 are respectively slidably connected to the top of the inner shovel base 10 through the inclined guide groove. The inner inclined ejectors are relatively arranged on the other two sides of the inner shovel base 10, and each of the inner inclined ejectors includes an inclined ejector seat 12 and an inclined ejector rod 13. The bottom end of the inclined ejector seat 12 is fixedly connected to the ejection plate 5, and the bottom end of the inclined ejector rod 13 is slidably connected to the top end of the inclined ejector seat 12, and the top end of the inclined ejector rod 13 extends into the cavity. Each of the inner sliding blocks 11 and each of the inclined ejector rods 13 is provided with an inner forming portion 14 located in the cavity, and the inner forming portion 14 is used to form the inner side wall of the special-shaped polyhedron workpiece and the undercut thereon.

[0019] Furthermore, among the four outer sliding blocks 8 , the structures of the outer forming parts 9 relatively arranged on two outer sliding blocks 8 are the same.

[0020] Furthermore, the inner molded parts 14 of the two inner sliding blocks 11 have the same structure, and the inner molded parts 14 of the two inclined lift rods 13 have the same structure.

[0021] Furthermore, wear-resistant blocks are provided on the sliding contact surfaces between the outer shovel base 7 and the outer sliding block 8 .

[0022] Furthermore, the injection mold further includes a bottom plate 6 , and the bottom plate 6 is arranged below the ejection plate 5 .

[0023] A working method of a demoulding structure for injection molding of a special-shaped polyhedron workpiece according to the present invention comprises the following steps: Step 1, after the injection molding is completed, the A plate 1 and the B plate 2 are opened first, and the A plate 1 drives the four outer shovel bases 7 to move upward, and the outer slider 8 moves outward under the action of the corresponding outer shovel base 7, so that the outer molding part 9 of the outer slider 8 is separated from the undercut on the outer wall of the special-shaped polyhedron workpiece 100. When the A plate 1 and the B plate 2 are fully opened, the outer molding part 9 is completely separated from the undercut on the outer wall of the special-shaped polyhedron workpiece 100, and the action of the outer slider 8 is completed; Step 2, after the mold is fully opened, the ejector plate 5 starts the first stage of ejection, and the ejector plate 5 drives the two inner inclined ejectors to move upward. At the same time, the ejector plate 5 drives the C plate 3 to move upward through the sequential mold opening mechanism, and the D plate 4 does not move, so that the C plate 3 and the D plate 4 are opened. During the upward movement of the C plate 3, the special-shaped polyhedron workpiece 100 and the two inner sliders 11 move upward together. The inner slider 11 moves inward under the action of the inner shovel base 10, so that the inner molded portion 14 of the inner slider 11 is separated from the undercut on the inner wall of the special-shaped polyhedron workpiece 100. When the C plate 3 and the D plate 4 are fully opened, the inner molded portion 14 of the inner slider 11 is completely separated from the undercut on the inner wall of the special-shaped polyhedron workpiece 100, and the action of the inner slider 11 is completed; Step 3, the ejector plate 5 starts the second stage of ejection, and the ejector plate 5 drives the two inner inclined ejectors to continue to move upward, the C plate 3 and the D plate 4 do not move, and the inclined ejector rod 13 of the inner inclined ejector moves inward under the action of the inclined ejector seat 12, so that the inner forming part 14 of the inclined ejector rod 13 is separated from the undercut on the inner wall of the special-shaped polyhedron workpiece 100. When the ejector plate 5 moves upward to the set distance, the inner forming part 14 of the inclined ejector rod 13 is completely separated from the undercut on the inner wall of the special-shaped polyhedron workpiece 100, and the special-shaped polyhedron workpiece 100 is ejected from the mold at the same time, and the inner inclined ejection action is completed.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A demoulding structure for injection molding of a special-shaped polyhedron workpiece, comprising an injection mold and a special-shaped polyhedron workpiece, characterized in that: The injection mold comprises an A plate, a B plate, a C plate, a D plate, an ejector plate, an external demoulding mechanism and an internal demoulding mechanism; The A plate, B plate, C plate, D plate and ejector plate are arranged in sequence from top to bottom, a cavity is formed between the B plate and the C plate, the special-shaped polyhedron workpiece is located in the cavity, and a sequential mold opening mechanism is provided between the ejector plate and the C plate; The external demoulding mechanism is arranged on the outside of the special-shaped polyhedron workpiece, and the external demoulding mechanism includes four external shovel bases and four external slide blocks, the four external shovel bases are respectively fixedly connected to the A plate, the four external slide blocks are respectively slidably connected to the B plate, the four external slide blocks are arranged opposite to each other in pairs, and the four external slide blocks are respectively slidably connected to the four external shovel bases in a one-to-one correspondence through oblique guide grooves, and each of the external slide blocks is provided with an external molding portion located in the mold cavity; The inner demolding mechanism is arranged on the inner side of the special-shaped polyhedron workpiece, and the inner demolding mechanism includes an inner shovel base, two inner sliding blocks and two inner inclined tops. The bottom of the inner shovel base is fixedly connected to the D plate, and the top of the inner shovel base extends into the cavity. The two inner sliding blocks are respectively slidably connected to the C plate. The two inner sliding blocks are relatively arranged on both sides of the inner shovel base, and the two inner sliding blocks are respectively slidably connected to the top of the inner shovel base through oblique guide grooves. The two inner inclined tops are relatively arranged on the other two sides of the inner shovel base. Each of the inner inclined tops includes an inclined top seat and an inclined top rod. The bottom end of the inclined top seat is fixedly connected to the ejection plate, the bottom end of the inclined top rod is slidably connected to the top end of the inclined top seat, and the top end of the inclined top rod extends into the cavity. Each of the inner sliding blocks and each of the inclined top rods is provided with an inner molding portion located in the cavity.

2. The demoulding structure for injection molding of a special-shaped polyhedron workpiece according to claim 1, characterized in that: Among the four outer sliding blocks, the structures of the outer forming parts arranged relatively on two outer sliding blocks are the same.

3. The demoulding structure for injection molding of a special-shaped polyhedron workpiece according to claim 1, characterized in that: The inner forming parts of the two inner sliding blocks have the same structure, and the inner forming parts of the two inclined ejector rods have the same structure.

4. The demoulding structure for injection molding of a special-shaped polyhedron workpiece according to claim 1, characterized in that: Wear-resistant blocks are arranged on the sliding contact surfaces between the outer shovel base and the outer sliding block.

5. The demoulding structure for injection molding of a special-shaped polyhedron workpiece according to claim 1, characterized in that: The injection mold further comprises a bottom plate, and the bottom plate is arranged below the ejection plate.

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