Automatic mold opening plastic toy injection molding mold and injection molding process

Abstract

The present invention discloses a mold for automatically opening a plastic toy injection molding mold and an injection molding process, comprising an upper mold and a lower mold, wherein one side of the upper mold is fixedly connected to an upper mold base, and one side of the lower mold is fixedly connected to a lower mold base, and one side of the lower mold base is provided with a pushing cylinder, and a movable plate is provided between the lower mold and the lower mold base, and one side of the movable plate is fixedly connected to the output end of the pushing cylinder, and the other side of the movable plate is provided with a plurality of push rods, and the push rods are movably inserted into the interior of the lower mold, and an expansion mechanism is provided inside the push rods. By providing the expansion mechanism, the present invention can increase the contact area between the push rods and the plastic toy, and at the same time, the expansion mechanism pushes the plastic toy out of the lower mold under the action of the pushing mechanism, thereby effectively demolding the plastic toy with a special shape, eliminating the need for workers to perform manual operations, and using machinery instead of manual labor to improve the production efficiency of the product.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molds, and in particular relates to an automatic mold-opening plastic toy injection mold and an injection molding process. Background Art

[0002] Plastic toys are a type of toy. Their main component is resin, and they are processed using the injection molding process. The advantages of the injection molding method are fast production speed and high efficiency. The shapes can be from simple to complex, and the sizes can be from large to small. Injection molding can form complex-shaped parts. It is suitable for mass production and molding processing fields such as complex-shaped products.

[0003] When demolding some larger or specially shaped plastic toys, the lower mold will take the plastic toy with it when it leaves the upper mold. Due to the high adhesion between the toy and the lower mold, ordinary push rods cannot push the toy out of the lower mold, requiring workers to manually demold the toy, thereby reducing product production efficiency.

[0004] Therefore, it is necessary to invent a kind of plastic toy injection molding mold and injection molding process of automatic mold opening to solve the above problems. Summary of the Invention

[0005] In view of the above problems, the present invention provides a plastic toy injection molding mold with automatic mold opening and an injection molding process to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a mold for plastic toy injection molding with automatic mold opening, comprising an upper mold and a lower mold, wherein one side of the upper mold is fixedly connected to an upper mold base, one side of the lower mold is fixedly connected to a lower mold base, one side of the lower mold base is provided with a pushing cylinder, a movable plate is provided between the lower mold and the lower mold base, one side of the movable plate is fixedly connected to the output end of the pushing cylinder, and the other side of the movable plate is provided with a plurality of push rods, the push rods are movably inserted into the interior of the lower mold, and an expansion mechanism is provided inside the push rods;

[0007] Limit rods are movably inserted on both sides of the movable plate, and both ends of the limit rods are fixedly connected to the lower mold and the lower mold base respectively. A first spring is sleeved on a surface of one section of the limit rod.

[0008] Furthermore, the expansion mechanism includes a working groove, a moving block is movably inserted inside the working groove, a number of connecting rods are arranged around the moving block, an expansion plate is provided at one end of the connecting rod, a contraction groove is provided on the surface of the push rod at the position of the expansion plate, an auxiliary spring plate is fixedly connected to the end of the expansion plate, and a pushing mechanism is provided between the moving block and the moving plate.

[0009] Furthermore, the pushing mechanism includes a second spring and a moving rod, the two ends of the second spring are fixedly connected to the moving block and the inner wall of the working groove respectively, one end of the moving rod is fixedly connected to the moving block, and the other end of the moving rod passes through the push rod and the moving plate and extends to the outside, and a toothed groove is provided on a surface of a bottom section of the moving rod, and a gear is meshed and connected at the bottom of the toothed groove, and the gear is rotatably inserted into the inside of the moving plate, and a toothed bar is meshed and connected at the bottom of the gear, and one end of the toothed bar passes through the moving plate and extends to the outside.

[0010] Furthermore, a section of the auxiliary spring piece is bent toward one side of the expansion plate, and an anti-friction soft layer is provided on the outer surface of the auxiliary spring piece.

[0011] Furthermore, the expansion plate is arranged in a ring relative to the center of the moving block, the inner side of the expansion plate is a plane and the outer side is an arcuate surface, and the arcuate surface of the expansion plate matches the surface of the push rod.

[0012] Furthermore, one end of the expansion plate is hinged to the connecting rod, and a torsion spring is provided at the hinge between the connecting rod and the expansion plate, and the torsion spring is in a torsion state.

[0013] Furthermore, the rotation range of the expansion plate is 0-80 degrees.

[0014] Furthermore, the distance between the toothed strip and the lower die base is 1.1 times the distance from the rear end of the expansion plate to the front end of the push rod.

[0015] The present invention also provides a process for opening a mold for a plastic toy injection molding mold using any one of the above-mentioned automatic mold opening methods, the process comprising the following steps:

[0016] Step 1: The injection mechanism injects the raw material into the molding cavity composed of the upper mold and the lower mold through the upper mold feed port. After the product in the molding cavity cools and forms, the external mechanism drives the lower mold base and the lower mold to move, and the product is separated from the upper mold.

[0017] Step 2: The cylinder is pushed to move the moving plate and several push rods. The push rods push part of the product. When the expansion plate leaves the lower die position, the torsion spring deflects and expands it. The toothed bar is blocked by the lower die base and shrinks, driving the gear to rotate. The moving rod then drives the moving block to move, and the connecting rod drives the expansion plate to gradually approach the product.

[0018] Step 3: The anti-friction soft layer on the surface of the auxiliary spring contacts the product and continues to push it. The auxiliary spring deforms and fits the surface of the product. Several auxiliary springs increase the pushing area with the push rod and push the product out of the lower mold.

[0019] Step 4: Push the cylinder to drive the moving plate back, the second spring pushes the moving block and the moving rod to reset, and the gear and the toothed bar are reset accordingly. Then the lower mold pushes the expansion plate to retract it into the shrinkage groove. After the upper mold and the lower mold are re-attached, the next injection molding work can begin.

[0020] The technical effects and advantages of the present invention are as follows:

[0021] 1. The present invention is equipped with an expansion mechanism to increase the contact area between the push rod and the plastic toy. At the same time, the expansion mechanism pushes the plastic toy out of the lower mold under the action of the pushing mechanism, thereby effectively demolding plastic toys with special shapes. There is no need for workers to perform manual operations, and machinery is used instead of labor, which saves costs and improves product production efficiency.

[0022] 2. The present invention is provided with a pushing mechanism, which uses the movement of the movable plate itself to drive the pushing mechanism to work, and makes the movable block move in the push rod. The expansion mechanism pushes the plastic toy at a speed greater than the moving speed of the push rod, providing power for the expansion mechanism. The pushing mechanism is a purely mechanical structure and does not require a power mechanism, thereby saving electricity resources.

[0023] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 shows a schematic diagram of the overall structure of an embodiment of the present invention;

[0026] Figure 2 shows a front cross-sectional view of an embodiment of the present invention;

[0027] Figure 3 A front cross-sectional view of a push rod according to an embodiment of the present invention is shown;

[0028] Figure 4 The embodiment of the present invention is shown Figure 3 A magnified view of part B;

[0029] Figure 5 It is a process flow chart of the present invention;

[0030] In the figure: 1. Upper mold; 2. Lower mold; 3. Upper mold base; 4. Lower mold base; 5. Push cylinder; 6. Moving plate; 7. Push rod; 8. Limit rod; 9. First spring; 10. Working groove; 11. Moving block; 12. Connecting rod; 13. Expansion plate; 14. Contraction groove; 15. Auxiliary spring; 16. Second spring; 17. Moving rod; 18. Toothed groove; 19. Gear; 20. Toothed bar; 21. Anti-friction soft layer. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments 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 shall fall within the scope of protection of the present invention.

[0032] The present invention provides a plastic toy injection molding mold with automatic mold opening, such as Figure 1-4 As shown, it includes an upper mold 1 and a lower mold 2, one side of the upper mold 1 is fixedly connected to an upper mold base 3, one side of the lower mold 2 is fixedly connected to a lower mold base 4, the lower mold base 4 is connected to an external mechanism, the upper mold 1 is fixedly connected to an external bracket, one side of the lower mold base 4 is provided with a pushing cylinder 5, a movable plate 6 is provided between the lower mold 2 and the lower mold base 4, one side of the movable plate 6 is fixedly connected to the output end of the pushing cylinder 5, and the other side of the movable plate 6 is provided with a plurality of push rods 7, the push rods 7 are movably inserted into the interior of the lower mold 2, and an expansion mechanism is provided inside the push rods 7;

[0033] Limit rods 8 are movably inserted on both sides of the movable plate 6. The two ends of the limit rods 8 are fixedly connected to the lower mold 2 and the lower mold base 4 respectively. A first spring 9 is sleeved on one surface of the limit rod 8.

[0034] When the plastic toy is injection molded, the external mechanism drives the lower mold base 4 so that the lower mold 2 fits tightly with the fixed upper mold 1. Then the injection mechanism injects the raw material into the molding cavity composed of the upper mold 1 and the lower mold 2 through the feed port of the upper mold 1. The external cooling mechanism injects cooling water into the cooling water channel of the upper mold 1 and the lower mold 2. After waiting for the product in the molding cavity to cool and form, the external mechanism drives the lower mold base 4 and the lower mold 2 to move. The plastic toy leaves and separates from the upper mold 1 along with the lower mold 2, pushing the cylinder 5 to work and drive the movable plate 6 and several push rods 7 to move. The several push rods 7 push part of the plastic toy, and at the same time, with the assistance of the expansion mechanism, push the plastic toy out of the lower mold 2. The two limit rods 8 limit the movable plate 6 to make it move more smoothly, and the first spring 9 makes the movable plate 6 more stable when moving.

[0035] like Figure 3-4 As shown, the expansion mechanism includes a working groove 10, a moving block 11 is movably inserted inside the working groove 10, and a number of connecting rods 12 are arranged around the moving block 11. An expansion plate 13 is provided at one end of the connecting rod 12. The expansion plate 13 is arranged in a ring relative to the center of the moving block 11. The inner side of the expansion plate 13 is a plane and the outer side is an arc-shaped surface. The arc-shaped surface of the expansion plate 13 matches the surface of the push rod 7. One end of the expansion plate 13 is hinged to the connecting rod 12, and a torsion spring is provided at the hinge between the connecting rod 12 and the expansion plate 13. The torsion spring is in a torsion state, the rotation range of the expansion plate 13 is 0-80 degrees, a contraction groove 14 is provided on the surface of the push rod 7 at the position of the expansion plate 13, and an auxiliary spring piece 15 is fixedly connected to the end of the expansion plate 13. The distance between the rack bar 20 and the lower die base 4 is 1.1 times the distance from the rear end of the expansion plate 13 to the front end of the push rod 7. A pushing mechanism is provided between the moving block 11 and the moving plate 6. A section of the auxiliary spring piece 15 is bent toward one side of the expansion plate 13, and an anti-friction soft layer 21 is provided on the outer surface of the auxiliary spring piece 15.

[0036] When the cylinder 5 is pushed to drive the movable plate 6 and several push rods 7 to move, the push rod 7 pushes part of the plastic toy. When the expansion plate 13 leaves the position of the lower mold 2, the lower mold 2 will no longer block the expansion plate 13. The torsion spring resets so that several expansion plates 13 are deflected and expanded at their hinged positions. Then the pushing mechanism drives the movable block 11 to move. The movable block 11 then drives the expansion plate 13 gradually approaching the plastic toy through the connecting rod 12. The anti-friction soft layer 21 on the surface of the auxiliary spring 15 first contacts the plastic toy. The surface of the anti-friction soft layer 21 is smooth and soft, thereby avoiding friction with the surface of the plastic toy to cause damage. At the same time, when the auxiliary spring 15 contacts the plastic toy, the auxiliary spring 15 will deform with the surface of the plastic toy and fit with it. Several auxiliary springs 15 increase the pushing area with the push rod 7 and push the product out of the lower mold 2.

[0037] The present invention is provided with an expansion mechanism, which can increase the contact area between the push rod 7 and the plastic toy. At the same time, the expansion mechanism pushes the plastic toy out of the lower mold 2 under the action of the pushing mechanism, thereby effectively demolding plastic toys with special shapes. There is no need for workers to perform manual operations, and machinery is used instead of manual labor, which saves costs and improves product production efficiency.

[0038] like Figure 2-4As shown, the pushing mechanism includes a second spring 16 and a moving rod 17, the two ends of the second spring 16 are fixedly connected to the moving block 11 and the inner wall of the working groove 10 respectively, one end of the moving rod 17 is fixedly connected to the moving block 11, and the other end of the moving rod 17 passes through the push rod 7 and the moving plate 6 to extend to the outside, and a toothed groove 18 is provided on the bottom surface of the moving rod 17, and a gear 19 is meshed and connected at the bottom of the toothed groove 18, and the gear 19 is rotatably inserted into the inside of the moving plate 6, and a toothed bar 20 is meshed and connected at the bottom of the gear 19, and one end of the toothed bar 20 passes through the moving plate 6 and extends to the outside.

[0039] When the movable plate 6 moves a certain distance, the expansion plate 13 has left the position of the lower mold 2 and expanded, and the toothed bar 20 contacts the surface of the lower mold base 4 and is blocked by it. The toothed bar 20 gradually shrinks back into the movable plate 6 and drives the gear 19 to rotate. The gear 19 rotates and moves the movable rod 17 through the toothed groove 18. The movement of the movable rod 17 can drive the movable block 11 to move and compress the second spring 16. When the movable block 11 moves, it drives the expansion plate 13 and the auxiliary spring 15 through the connecting rod 12 to push the plastic toy. At the same time, the speed of the expansion plate 13 and the auxiliary spring 15 is greater than the moving speed of the push rod 7, which facilitates pushing the plastic toy away from the lower mold 2.

[0040] The present invention is provided with a pushing mechanism, which uses the movement of the movable plate 6 itself to drive the pushing mechanism to work, and makes the movable block 11 move in the push rod 7. The expansion mechanism pushes the plastic toy at a speed greater than the movement speed of the push rod 7, providing power for the expansion mechanism. The pushing mechanism is a purely mechanical structure and does not require a power mechanism, thereby saving electricity resources.

[0041] Refer to the instruction manual Figure 5 The present invention also provides a process for opening a mold for a plastic toy injection molding mold using any one of the above-mentioned automatic mold opening methods, the process comprising the following steps:

[0042] Step 1: The injection mechanism injects the raw material into the molding cavity formed by the upper mold 1 and the lower mold 2 through the feed port of the upper mold 1. After the product in the molding cavity cools and forms, the external mechanism drives the lower mold base 4 and the lower mold 2 to move, and the product is separated from the upper mold 1.

[0043] Step 2: The cylinder 5 is pushed to work and drive the movable plate 6 and several push rods 7 to move. The push rods 7 push part of the product. When the expansion plate 13 leaves the position of the lower mold 2, the torsion spring deflects and expands it. The rack bar 20 is blocked by the lower mold base 4 and shrinks, driving the gear 19 to rotate. The moving rod 17 then drives the moving block 11 to move, and the connecting rod 12 drives the expansion plate 13 to gradually approach the product.

[0044] Step 3: The anti-friction soft layer 21 on the surface of the auxiliary spring piece 15 contacts the product and continues to push it. The auxiliary spring piece 15 deforms and fits the surface of the product. Several auxiliary spring pieces 15 increase the pushing area with the push rod 7 and push the product out of the lower mold 2.

[0045] Step 4: Push the cylinder 5 to drive the moving plate 6 to return, and the second spring 16 pushes the moving block 11 and the moving rod 17 to reset. The gear 19 and the rack bar 20 are then reset. Then the lower mold 2 pushes the expansion plate 13 to retract it into the shrinkage groove 14. After the upper mold 1 and the lower mold 2 are re-attached, the next injection molding work can begin.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plastic toy injection molding mold with automatic mold opening, comprising an upper mold (1) and a lower mold (2), characterized in that: One side of the upper mold (1) is fixedly connected to an upper mold base (3), one side of the lower mold (2) is fixedly connected to a lower mold base (4), one side of the lower mold base (4) is provided with a pushing cylinder (5), a movable plate (6) is provided between the lower mold (2) and the lower mold base (4), one side of the movable plate (6) is fixedly connected to the output end of the pushing cylinder (5), and the other side of the movable plate (6) is provided with a plurality of push rods (7), the push rods (7) are movably inserted into the interior of the lower mold (2), and an expansion mechanism is provided inside the push rods (7); Limit rods (8) are movably inserted on both sides of the movable plate (6), and the two ends of the limit rod (8) are fixedly connected to the lower mold (2) and the lower mold base (4) respectively. A first spring (9) is sleeved on a surface of one section of the limit rod (8); The expansion mechanism comprises a working groove (10), a moving block (11) is movably inserted in the working groove (10), a plurality of connecting rods (12) are arranged around the moving block (11), an expansion plate (13) is arranged at one end of the connecting rod (12), a contraction groove (14) is provided on the surface of the push rod (7) at the position of the expansion plate (13), an auxiliary spring piece (15) is fixedly connected to the end of the expansion plate (13), and a pushing mechanism is arranged between the moving block (11) and the moving plate (6).

2. The automatic mold opening plastic toy injection mold according to claim 1, characterized in that: The pushing mechanism includes a second spring (16) and a moving rod (17), the two ends of the second spring (16) are fixedly connected to the moving block (11) and the inner wall of the working groove (10), respectively. One end of the moving rod (17) is fixedly connected to the moving block (11), and the other end of the moving rod (17) passes through the push rod (7) and the moving plate (6) and extends to the outside. A toothed groove (18) is provided on a surface of a bottom section of the moving rod (17), and a gear (19) is meshed with the bottom of the toothed groove (18). The gear (19) is rotatably inserted into the inside of the moving plate (6), and the bottom of the gear (19) is meshed with a toothed bar (20), and one end of the toothed bar (20) passes through the moving plate (6) and extends to the outside.

3. The automatic mold opening plastic toy injection mold according to claim 2, characterized in that: A section of the auxiliary spring piece (15) is bent toward one side of the expansion plate (13), and an anti-friction soft layer (21) is provided on the outer surface of the auxiliary spring piece (15).

4. The automatic mold opening plastic toy injection mold according to claim 3, characterized in that: The expansion plate (13) is arranged in a ring relative to the center of the moving block (11), the inner side of the expansion plate (13) is a plane and the outer side is an arcuate surface, and the arcuate surface of the expansion plate (13) matches the surface of the push rod (7).

5. The automatic mold opening plastic toy injection mold according to claim 4, characterized in that: One end of the expansion plate (13) is hinged to the connecting rod (12), and a torsion spring is provided at the hinge between the connecting rod (12) and the expansion plate (13), and the torsion spring is in a torsion state.

6. The automatic mold opening plastic toy injection mold according to claim 5, characterized in that: The rotation range of the expansion plate (13) is 0-80 degrees.

7. The automatic mold opening plastic toy injection mold according to claim 6, characterized in that: The distance between the toothed bar (20) and the lower die base (4) is 1.1 times the distance from the rear end of the expansion plate (13) to the front end of the push rod (7).

8. A process for opening a mold using the automatic mold opening plastic toy injection mold according to claim 7, characterized in that: The process includes the following steps, Step 1: The injection molding mechanism injects the raw material into the molding cavity formed by the upper mold (1) and the lower mold (2) through the feed port of the upper mold (1). After the product in the molding cavity is cooled and formed, the external mechanism drives the lower mold base (4) and the lower mold (2) to move, and the product is separated from the upper mold (1). Step 2: The cylinder (5) is pushed to work and drive the movable plate (6) and several push rods (7) to move. The push rods (7) push part of the product. When the expansion plate (13) leaves the position of the lower mold (2), the torsion spring deflects and expands it. The toothed bar (20) is blocked by the lower mold base (4) and shrinks and drives the gear (19) to rotate. The movable rod (17) then drives the movable block (11) to move. The connecting rod (12) drives the expansion plate (13) to gradually approach the product. Step 3: The anti-friction soft layer (21) on the surface of the auxiliary spring piece (15) contacts the product and continues to push it, and the auxiliary spring piece (15) deforms and fits the surface of the product. Several auxiliary spring pieces (15) increase the pushing area with the push rod (7) and push the product out of the lower mold (2); Step 4: Push the cylinder (5) to drive the moving plate (6) back, and the second spring (16) pushes the moving block (11) and the moving rod (17) to reset, and the gear (19) and the rack bar (20) are reset accordingly. Then the lower mold (2) pushes the expansion plate (13) to retract it into the shrinkage groove (14). After the upper mold (1) and the lower mold (2) are re-attached, the next injection molding work can begin.

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