Fully automatic punching mechanism for separating injection molded products from injection bars

Abstract

The application discloses a full-automatic punching mechanism for separating a mold injection product from an injection rod, relates to the technical field of water gate cutting, and locally optimizes the water gate cutting mode of the injection product, and is specifically used for the synchronous cutting process of multiple water gates, and specifically comprises the following steps: for multiple water gates at different height positions, an upper tool holder and a lower tool holder are adopted, an upper cutter is arranged in the upper tool holder, and a lower supporting cutter is arranged in the lower tool holder, wherein the lower supporting cutter is used for supporting the lower side position of the water gate, and the upper cutter is directly used as a water gate cutting structure; on this basis, the two upper cutters in the upper tool holder can be relatively moved, and specifically, the water gate position at the highest point is taken as a starting point, when the lower supporting cutter supports the water gate position, one of the upper cutters contacts the water gate position at the highest point, the other upper cutter can be moved in cooperation, and the two upper cutters contact the water gate simultaneously, so that the water gate cutting action is completed in a synchronous supporting mode.

Description

Technical Field

[0001] This invention relates to the field of sprue cutting technology, and more specifically to a fully automatic punching mechanism for separating injection molded products from injection molding rods. Background Technology

[0002] For injection molded products, they are mainly produced by injection molding through injection molds. The injection mold contains a sprue and a molding cavity. Molten plastic is injected into the molding cavity along the sprue. After the plastic cools and solidifies, it forms an injection molded product with a corresponding shape. The plastic in the sprue cools and solidifies simultaneously to form the injection rod and other gate structures. Therefore, gate cutting is also required. For relevant technical content in the automatic gate cutting machine for injection molding published in CN103407114A, please refer to the relevant technical content.

[0003] For injection molded products, an injection mold can produce one or more products in a single injection molding process. For a single product, it is often used to produce larger injection molded products, while for multiple products, it is often used to produce relatively smaller injection molded products. In order to ensure the injection quality, multiple gate structures are often added for a single product, while relatively small injection molded products are mostly single gates.

[0004] As can be seen above, a single product contains multiple sprue structures, and multiple injection-molded products obtained by one-piece molding also contain sprue structures. It should be noted that the height position of the sprue relative to the injection-molded product varies depending on the shape of the product. Therefore, for the current sprue cutting structure, the relative position of the cutting head needs to be adjusted according to the sprue position to ensure that the relative position of each cutting head corresponds to the corresponding sprue position. This requires mold fitters to have higher dimensional accuracy requirements for the installation position during assembly. Furthermore, during long-term operation, differences may occur between the relative height of the cutting head and the sprue. This could result in insufficient cutting head stroke, failing to completely cut off the sprue, or the sprue being "broken off," leading to problems such as burrs on the sprue position of the injection-molded product after sprue removal. Summary of the Invention

[0005] The purpose of this invention is to provide a fully automatic punching mechanism for separating injection molded products from injection rods, in order to solve the problem that in the process of cutting the gate of injection molded products, the relative height position of the gate structure is different, which puts higher demands on the mold fitter's assembly and may even cause insufficient cutting stroke.

[0006] The objective of this invention can be achieved through the following technical solution: a fully automatic punching mechanism for separating injection molded products from injection rods, comprising a base plate, a movable plate, a mounting plate, a fixed plate, and a vertical wall frame. The base plate, movable plate, mounting plate, and fixed plate are arranged sequentially from bottom to top. The vertical wall frame is mounted on the base plate, and the fixed plate is mounted on the vertical wall frame. A pneumatic push rod is mounted at the center point of the upper surface of the fixed plate. The transmission shaft of the pneumatic push rod extends downward, and the end of the transmission shaft of the pneumatic push rod is connected to the center point of the mounting plate.

[0007] An upper pressure seat is provided on the outer wall of the movable plate near the base plate, and a lower pressure seat is installed on the outer wall of the base plate near the movable plate. An upper knife seat is installed on the movable plate at the position corresponding to the upper pressure seat, and a lower knife seat is installed on the base plate at the position corresponding to the lower pressure seat. An upper cutting knife and a lower supporting knife are respectively provided in the upper knife seat and the lower knife seat, and the number of upper cutting knives and lower supporting knives in the upper knife seat and the lower knife seat is two.

[0008] The upper cutter holder has a gear cavity inside, in which a central rotating gear and two driving gears are rotatably mounted. The two driving gears mesh with the central rotating gear, but the two driving gears do not mesh with each other. The upper cutter has a gear groove on its inner wall near the driving gear, and the upper cutter is slidably connected in the vertical direction in the upper cutter holder. The gear groove meshes with the driving gear.

[0009] The upper tool holder is further configured such that an mounting sleeve is installed on the outer wall of the corresponding intermediate gear, a coiled spring is provided inside the mounting sleeve, a support rod is installed at the center point of the intermediate gear, the support rod passes through the upper tool holder, one end of the support rod is connected to one end of the coiled spring, and the other end of the coiled spring is installed on the inner wall of the mounting sleeve.

[0010] The upper pressure seat is further configured to be slidably connected in the vertical direction within the movable plate, and a guide rod is installed on the upper pressure seat. The guide rod is slidably connected in the vertical direction within the movable plate. A first spring is installed on the upper surface of the movable plate corresponding to the upper pressure seat, and the top end of the first spring is installed on the lower surface of the mounting plate.

[0011] A further configuration is provided: disc springs are installed at the four corners of the lower surface of the mounting plate, and the lower ends of the disc springs are installed at the four corners of the upper surface of the movable plate.

[0012] The lower support blade is further configured such that it is slidably connected in the vertical direction within the lower blade holder, and is located directly below the upper cutter.

[0013] A further configuration is provided: a second spring is installed at the center point of the lower surface of the lower cutter, and the second spring is installed in the lower cutter holder.

[0014] The following configuration is further provided: a central support block is provided at the center electrical position on the upper surface of the lower tool holder, and a cavity corresponding to the central support block is opened inside the lower tool holder. A stator electrical block is installed at the bottom of the inner wall of the cavity. A slide rod is installed at the center point of the lower surface of the central support block. The slide rod extends downward into the cavity, and a mover electrical block is installed at the end of the slide rod. The mover electrical block and the stator electrical block are electrically connected.

[0015] A third spring is further provided on the outer circumference of the slide rod at the top of the moving electric block and the inner wall of the cavity.

[0016] The present invention has the following beneficial effects:

[0017] 1. This invention mainly addresses the gate cutting action of injection molded products. More specifically, it addresses the process of cutting multiple gates at different heights. Specifically, it involves setting two movable upper cutters in the upper cutter holder. The two upper cutters move relative to the gate positions. Specifically, the highest gate position is used as the starting air cushion. When one of the gates contacts the highest gate position, the two upper cutters can move in two states: upward or downward. The purpose is to ensure that the two upper cutters contact the gate positions simultaneously and perform synchronous gate cutting actions, avoiding the situation where one gate is "broken" due to time differences in the gate cutting actions at different positions.

[0018] 2. A lower cutter holder is added to the base plate, and a lower support cutter corresponding to the upper cutter is added to the lower cutter holder. The purpose is to support the sprue position and further avoid the problem of the sprue being "broken". On this basis, the lower support cutter can move vertically through a second spring, and a central support block is added. The central support block corresponds to the injection rod in the injection molded product. The central support block moves with the sprue cutting action. The purpose of the central support block is to push the mover electrical block to contact the stator electrical block, as the judgment data for the completion of sprue cutting. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the fully automatic punching mechanism for separating molded products from injection rods proposed in this invention;

[0021] Figure 2This is an exploded view of the fully automatic punching mechanism for separating molded products from injection rods proposed in this invention;

[0022] Figure 3 This is a cross-sectional view of the movable plate component in the fully automatic punching mechanism for separating molded products from the injection rod proposed in this invention;

[0023] Figure 4 This is a schematic diagram of the upper blade holder component in the fully automatic punching mechanism for separating molded products from injection rods proposed in this invention;

[0024] Figure 5 This is a cross-sectional view of the upper blade holder component in the fully automatic punching mechanism for separating molded products from injection rods proposed in this invention;

[0025] Figure 6 This is a cross-sectional view of the lower cutter holder component in the fully automatic punching mechanism for separating molded products from injection rods proposed in this invention.

[0026] In the diagram: 1. Base plate; 2. Movable plate; 3. Vertical wall frame; 4. Pneumatic push rod; 5. Fixed plate; 6. Mounting plate; 7. Disc spring; 8. First spring; 9. Upper cutter holder; 10. Upper pressure seat; 11. Lower pressure seat; 12. Guide rod; 13. Mounting sleeve; 14. Upper cutter; 15. Gear groove; 16. Central gear; 17. Coil spring; 18. Gear cavity; 19. Drive gear; 20. Lower cutter holder; 21. Stator electrical block; 22. Second spring; 23. Lower support cutter; 24. Center support block; 25. Slide rod; 26. Third spring; 27. Mover electrical block. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] For gate cutting operations in injection molded products, there are multiple gate locations between the injection rod and the product, and each gate location has a different height relative to the product. Therefore, when assembling the gate cutting mold, not only is higher dimensional accuracy required for the mold fitter during assembly, but also, over long-term use, the relative height between the cutting head and the gate may differ. This could result in insufficient cutting head stroke, failing to completely remove the gate, or the gate being "broken off." To address this, the following technical solution is proposed:

[0030] Reference Figures 1-5 The fully automatic punching mechanism for separating the injection molded product from the injection rod in this embodiment includes a base plate 1, a movable plate 2, a mounting plate 6, a fixed plate 5, and a vertical wall frame 3. The base plate 1, movable plate 2, mounting plate 6, and fixed plate 5 are arranged sequentially from bottom to top. The vertical wall frame 3 is mounted on the base plate 1, and the fixed plate 5 is mounted on the vertical wall frame 3. A pneumatic push rod 4 is installed at the center point of the upper surface of the fixed plate 5. The transmission shaft of the pneumatic push rod 4 extends downward, and the end of the transmission shaft of the pneumatic push rod 4 is connected to the center point of the mounting plate 6.

[0031] An upper pressure seat 10 is provided on the outer wall of the movable plate 2 near the base plate 1, and a lower pressure seat 11 is installed on the outer wall of the base plate 1 near the movable plate 2. An upper knife seat 9 is installed on the movable plate 2 at the position corresponding to the upper pressure seat 10, and a lower knife seat 20 is installed on the base plate 1 at the position corresponding to the lower pressure seat 11. An upper cutting knife 14 and a lower supporting knife 23 are respectively provided in the upper knife seat 9 and the lower knife seat 20, and the number of upper cutting knives 14 and lower supporting knives 23 in the upper knife seat 9 and the lower knife seat 20 is two.

[0032] The upper cutter holder 9 has a gear cavity 18 inside, in which a central rotating gear 16 and two driving gears 19 are rotatably mounted. The two driving gears 19 mesh with the central rotating gear 16, but the two driving gears 19 do not mesh with each other. The upper cutter 14 has a gear groove 15 on the inner wall near the driving gear 19, and the upper cutter 14 is slidably connected in the vertical direction in the upper cutter holder 9. The gear groove 15 meshes with the driving gear 19. Disc springs 7 are installed at the four corners of the lower surface of the mounting plate 6, and the lower ends of the disc springs 7 are installed at the four corners of the upper surface of the movable plate 2.

[0033] An mounting sleeve 13 is installed on the outer wall of the upper tool holder 9 corresponding to the position of the intermediate gear 16. A coiled spring 17 is provided inside the mounting sleeve 13. A support rod is installed at the center point of the intermediate gear 16. The support rod passes through the upper tool holder 9, and one end of the support rod is connected to one end of the coiled spring 17. The other end of the coiled spring 17 is installed on the inner wall of the mounting sleeve 13.

[0034] The upper pressure seat 10 is slidably connected in the vertical direction in the movable plate 2, and a guide rod 12 is installed on the upper pressure seat 10. The guide rod 12 is slidably connected in the vertical direction in the movable plate 2. A first spring 8 is installed on the upper surface of the movable plate 2 corresponding to the upper pressure seat 10. The top end of the first spring 8 is installed on the lower surface of the mounting plate 6.

[0035] This embodiment mainly focuses on the gate cutting action and does not include the material feeding action. The gate cutting action includes the following steps:

[0036] Step 1: Place the injection molded product with the sprue to be cut on the lower pressure seat 11. When the pneumatic push rod 4 is activated, the mounting plate 6 is moved down first, and the movable plate 2 is moved down synchronously until the upper pressure seat 10 contacts the injection molded product first. During this process, under the action of the disc spring 7 and the first spring 8, the upper pressure seat 10 presses down on the injection molded product while moving up synchronously until the upper pressure seat 10 and the lower pressure seat 11 clamp and fix the injection molded product. The injection rod and the injection molded product are clamped by the upper pressure seat 10 and the lower pressure seat 11 simultaneously.

[0037] Step Two: In Step One, the downward movement distance of the movable plate 2 and the mounting plate 6 depends on the size of the injection molded product and is not limited here. It should be noted that the upper cutter holder 9 moves downward synchronously until one of the upper cutters 14 in the upper cutter holder 9 first contacts the highest point of the sprue between the injection molding rod and the injection molded product. When the movable plate 2 moves downward synchronously, one of the upper cutters 14 that contacts the highest point of the sprue will then... Figure 5 Explanation: When the upper cutter 14 located on the left side of the upper cutter holder 9 first contacts the highest point of the sprue, the upper cutter 14 does not perform the sprue cutting action, but moves upward. Then the drive gear 19 corresponding to the position of the upper cutter 14 rotates clockwise, which in turn drives the intermediate gear 16 to rotate counterclockwise. Then the other drive gear 19 rotates counterclockwise, driving the other upper cutter 14 downward, until both upper cutters 14 contact the sprue position at the same time.

[0038] Step 3: As shown in Step 2, when the two upper cutters 14 simultaneously contact the sprue position, the movable plate 2 continues to move down a certain distance, so that multiple upper cutters 14 can perform synchronous cutting actions on each sprue position. The purpose is to avoid the problem of poor sprue cutting quality caused by the upper cutter 14 failing to contact the sprue position or the upper cutter 14 overtraveling in a certain place.

[0039] Step 4: As shown in Steps 2 and 3, when the upper cutter 14 moves, the central gear 16 rotates, driving the coil spring 17 to wind. Thus, the coil spring 17 has elastic potential energy during the winding process. When the movable plate 2 resets, the elastic potential energy "stored" in the coil spring 17 drives the central gear 16 to reverse, thereby driving the two upper cutters 14 to reset. It should be noted that in the initial state, the initial positions of the two upper cutters 14 can be understood as being at the same height.

[0040] Example 2

[0041] This embodiment further optimizes and improves the water inlet cutting action in Embodiment 1:

[0042] Reference Figure 6In this embodiment, the lower support knife 23 is slidably connected in the vertical direction in the lower knife holder 20, and the lower support knife 23 is located directly below the upper cutter 14. A second spring 22 is installed at the center point of the lower surface of the lower support knife 23. The second spring 22 is installed in the lower knife holder 20. A center support block 24 is provided at the center electric position of the upper surface of the lower knife holder 20, and a cavity corresponding to the center support block 24 is opened inside the lower knife holder 20. A stator electrical block 21 is installed at the bottom end of the inner wall of the cavity. A slide rod 25 is installed at the center point of the lower surface of the center support block 24. The slide rod 25 extends downward into the cavity, and a mover electrical block 27 is installed at the end of the slide rod 25. The mover electrical block 27 and the stator electrical block 21 are electrically connected. A third spring 26 is provided at the position of the outer circumference of the slide rod 25 between the mover electrical block 27 and the top of the inner wall of the cavity.

[0043] Operating principle: As shown in Embodiment 1, while the upper pressure seat 10 and the lower pressure seat 11 clamp and fix the injection molded product, the lower support knife 23 first contacts the lower side of the sprue position, and the central support block 24 supports the injection rod. When the clamping and fixing action of the injection molded product is completed, the lower support knife 23 and the central support block 24 still have compressible potential energy through the second spring 22 and the third spring 25. The purpose of this is to cooperate with step three in Embodiment 1.

[0044] It should be noted that: based on the size of the injection molded product, the maximum downward movement distance of the movable plate 2 of the equipment is predetermined. Therefore, it can be understood that: when the injection molded product is clamped and fixed, the moving electric block 27 does not contact the stator electric block 21. Instead, when step three is completed, the moving electric block 27 contacts the stator electric block 21 as an electrical signal to determine the completion of the sprue cutting action.

[0045] It should be further explained that the movement of the lower support blade 23 is different from that of the upper cutter 14. The lower support blade 23 can be adjusted autonomously according to the position of the sprue. Specifically, it relies on the clamping and fixing action of the upper pressure seat 10 and the lower pressure seat 11 on the injection molded product. However, the lower support blade 23 and the central support block 24 mainly serve to support the injection rod. After the sprue cutting action is completed, the second spring 22 and the third spring 26 separate the injection rod from the injection molded product.

[0046] In summary, the gate cutting method for injection molded products is partially optimized. Specifically, for the synchronous cutting process of multiple gates, an upper and lower cutter holder structure is used. The upper cutter holder houses the upper cutting blade, and the lower cutter holder houses the lower support blade. The lower support blade supports the lower part of the gate, while the upper cutting blade serves as the direct structure for cutting the gate. Based on this, the two upper cutter holders can move relative to each other. Specifically, starting from the highest point of the gate, when the lower support blade is supporting the gate, if one upper cutting blade contacts the highest point, the other upper cutting blade can move in coordination until both upper cutting blades simultaneously contact the gate, thus completing the gate cutting action through synchronous support.

[0047] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A fully automatic punching mechanism for separating injection-molded products from injection molding rods, comprising a base plate (1), a movable plate (2), a mounting plate (6), a fixed plate (5), and a vertical support (3), characterized in that, The base plate (1), movable plate (2), mounting plate (6), and fixed plate (5) are arranged sequentially from bottom to top. The vertical wall frame (3) is installed on the base plate (1), and the fixed plate (5) is installed on the vertical wall frame (3). A pneumatic push rod (4) is installed at the center point of the upper surface of the fixed plate (5). The transmission shaft of the pneumatic push rod (4) extends downward, and the end of the transmission shaft of the pneumatic push rod (4) is connected to the center point of the mounting plate (6). The movable plate (2) is provided with an upper pressure seat (10) near the outer wall of the base plate (1), and the base plate (1) is provided with a lower pressure seat (11) near the outer wall of the movable plate (2). The movable plate (2) is provided with an upper knife seat (9) corresponding to the upper pressure seat (10), and the base plate (1) is provided with a lower knife seat (20) corresponding to the lower pressure seat (11). The upper knife seat (9) and the lower knife seat (20) are respectively provided with an upper cutting knife (14) and a lower supporting knife (23), and the number of upper cutting knife (14) and lower supporting knife (23) in the upper knife seat (9) and the lower knife seat (20) is two. The upper cutter holder (9) has a gear cavity (18) inside, in which a central gear (16) and two driving gears (19) are rotatably mounted. The two driving gears (19) mesh with the central gear (16), but do not mesh with each other. The upper cutter (14) has a gear groove (15) on the inner wall near the driving gear (19), and the upper cutter (14) is slidably connected in the vertical direction in the upper cutter holder (9). The gear groove (15) meshes with the driving gear (19).

2. The fully automatic punching mechanism for separating molded products from injection molding rods according to claim 1, characterized in that, An mounting sleeve (13) is installed on the outer wall of the upper tool holder (9) corresponding to the central gear (16). A coiled spring (17) is provided inside the mounting sleeve (13). A support rod is installed at the center point of the central gear (16). The support rod passes through the upper tool holder (9), and one end of the support rod is connected to one end of the coiled spring (17). The other end of the coiled spring (17) is installed on the inner wall of the mounting sleeve (13).

3. The fully automatic punching mechanism for separating molded products from injection molding rods according to claim 1, characterized in that, The upper pressure seat (10) is slidably connected in the vertical direction in the movable plate (2), and a guide rod (12) is installed on the upper pressure seat (10). The guide rod (12) is slidably connected in the vertical direction in the movable plate (2). A first spring (8) is installed on the upper surface of the movable plate (2) corresponding to the upper pressure seat (10). The top end of the first spring (8) is installed on the lower surface of the mounting plate (6).

4. The fully automatic punching mechanism for separating molded products from injection molding rods according to claim 3, characterized in that, Disc springs (7) are installed at the four corners of the lower surface of the mounting plate (6), and the lower ends of the disc springs (7) are installed at the four corners of the upper surface of the movable plate (2).

5. The fully automatic punching mechanism for separating molded products from injection molding rods according to claim 1, characterized in that, The lower support knife (23) is slidably connected in the vertical direction in the lower knife holder (20), and the lower support knife (23) is located directly below the upper cutter (14).

6. The fully automatic punching mechanism for separating molded products from injection molding rods according to claim 5, characterized in that, A second spring (22) is installed at the center point of the lower surface of the lower support knife (23), and the second spring (22) is installed in the lower knife holder (20).

7. The fully automatic punching mechanism for separating molded products from injection molding rods according to claim 6, characterized in that, A central support block (24) is provided at the center electrical position on the upper surface of the lower tool holder (20), and a cavity corresponding to the central support block (24) is opened inside the lower tool holder (20). A stator electrical block (21) is installed at the bottom of the inner wall of the cavity. A slide rod (25) is installed at the center point of the lower surface of the central support block (24). The slide rod (25) extends downward into the cavity, and a mover electrical block (27) is installed at the end of the slide rod (25). The mover electrical block (27) and the stator electrical block (21) are electrically connected.

8. The fully automatic punching mechanism for separating molded products from injection molding rods according to claim 7, characterized in that, The slide bar (25) is provided with a third spring (26) at the position of the outer circumference of the top of the cavity inner wall between the moving electric block (27) and the moving electric block (27).

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