A new type of pneumatic water gap shearing mechanism

Abstract

The utility model discloses a novel pneumatic water gap shearing mechanism relates to charger production technical field, and this mechanism includes base, air cylinder, tool rest, station and tool. Tool includes handle, and the tongue board is slidably arranged at the top end of handle, and the tongue board end is connected with the cutting edge, and both sides are connected with the baffle, and the top of handle is equipped with the damping telescopic link and the spring of setting its outside, both are with handle and baffle and abut, and the top end of handle is installed with the cover plate. The utility model discloses through the damping telescopic link and the buffer effect of spring, realizes flexible contact in shearing moment, effectively avoids the tearing of water gap because of rigid impact, guarantees the evenness of injection molding shell cutout, simultaneously, and the cutting edge and handle adopt split type design, can be replaced alone after wearing, and maintenance cost is reduced. The mechanism structure is reasonable, and is applicable to the water gap automatic shearing of precision injection molding products such as charger.

Description

Technical Field

[0001] This utility model relates to the field of charger manufacturing technology, and in particular to a novel pneumatic water cutter mechanism. Background Technology

[0002] In the production of injection-molded products such as chargers, removing the sprue (i.e., the sprue head) is a crucial subsequent process. Our previously filed patent, CN202422864136.9, entitled "A Mechanism with Automatic Air Shear for Sprue Heads," provides an automated shearing solution. However, the tool structure in this patent's technical solution has significant room for optimization.

[0003] Specifically, the cutting tool used in this existing technology has a rigid, integrated connection between the blade and the handle. In this structure, during the shearing of the sprue, the blade experiences a tremendous impact force due to the high speed of the cylinder drive. This impact force acts directly on the connection between the sprue and the injection molded shell, easily causing the material at the connection to be forcibly torn rather than cleanly cut. This results in defects such as cut damage to the injection molded shell and stress whitening, severely impacting product yield.

[0004] Furthermore, this design integrates the tool holder, handle, and blade into a single, inseparable unit. When the blade wears down or chipps due to prolonged use and loses its sharpness, it cannot be replaced individually; the entire tool must be scrapped and replaced. This not only increases production and maintenance costs but also results in unnecessary material waste. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes a novel pneumatic shear mechanism.

[0006] This utility model proposes a novel pneumatic sprue shearing mechanism, comprising a base, a cylinder mounted on the top of the base, a cutter holder slidably connected to the top of the base via a linear guide rail, a workstation mounted on the top of the base for placing an injection molded shell, and a cutter mounted on the top of the cutter holder for shearing the sprue nozzle inside the injection molded shell. The telescopic end of the cylinder is connected to the cutter holder. The cutter includes a handle mounted on the top of the cutter holder, a tongue plate slidably disposed at the top of the handle, a blade connected to the end of the tongue plate, and baffles connected to both sides. A damping telescopic rod is disposed at the top of the handle, and a spring is sleeved on the outside of the damping telescopic rod. The damping telescopic rod and the spring abut against the handle and the baffles. A cover plate is installed at the top of the handle.

[0007] Furthermore, a limiting groove is provided at the top of the tool holder, and a first threaded hole is provided inside the limiting groove. The bottom end of the tool handle is engaged inside the limiting groove and is provided with a second recessed hole. A second fastening bolt is inserted inside the second recessed hole and is threadedly connected to the first threaded hole.

[0008] Furthermore, the top of the knife handle is provided with a groove, and openings are provided on both sides of the groove. The tongue plate and the baffle move inside the groove and the openings. The damping telescopic rod and the spring are located inside the groove.

[0009] Furthermore, the cover plate has a first recessed hole inside, and a first fastening bolt is inserted inside the first recessed hole. The bottom end of the groove has a second threaded hole, and the first fastening bolt is threadedly connected to the second threaded hole to fix the cover plate to the top of the tool holder.

[0010] Furthermore, the tongue plate has an clearance hole inside, through which the first fastening bolt passes. The clearance hole is an elongated hole with a length greater than the horizontal travel length of the tongue plate.

[0011] Furthermore, the upper surfaces of the tongue plate and the baffle are flush with each other and lower than the height of the groove, so that they do not contact the lower surface of the cover plate when the tongue plate and the baffle move horizontally.

[0012] The beneficial effects of this utility model are as follows: by designing the blade and handle as a separate elastic connection structure, a buffer is provided at the moment of cutting, which effectively avoids the problem of sprue tearing caused by rigid impact and ensures the quality of the injection molded shell cut. At the same time, the separate design allows the blade to be replaced independently after wear, without scrapping the entire tool, which significantly reduces maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the disassembled structure of this utility model; Figure 2 This is a schematic diagram of the assembly structure of this utility model; Figure 3 This is a schematic diagram of the disassembled structure of the cutting tool in this utility model; Figure 4 This is a schematic diagram of the assembly structure of the cutting tool and the tool holder in this utility model; Figure 5 This is a schematic diagram of the structure of the cutting tool after the cover plate is removed in this utility model.

[0014] In the diagram: 1. Base; 2. Cylinder; 3. Linear guide rail; 4. Tool holder; 41. Limiting groove; 42. First threaded hole; 5. Workstation; 6. Tool; 61. Tool holder; 62. Groove; 63. Opening; 64. Tongue plate; 65. Blade; 66. Baffle; 67. Damping telescopic rod; 68. Spring; 69. Cover plate; 610. First countersunk hole; 611. Clearance hole; 612. First fastening bolt; 613. Second threaded hole; 614. Second countersunk hole; 615. Second fastening bolt; 7. Injection molded shell; 71. Sprue. Detailed Implementation

[0015] Reference Figure 1-5 The present invention proposes a novel pneumatic sprue shearing mechanism, including a base 1, a cylinder 2 installed at the top of the base 1 as a power source, a knife holder 4 slidably connected to the base 1 via a linear guide rail 3, a knife 6 for shearing the sprue 71 inside the injection molded shell 7 installed at the top of the knife holder 4, and a workstation 5 for placing the injection molded shell 7 on the base 1. The cutting tool 6 is specifically composed of a handle 61, a tongue plate 64, a cutting edge 65, a baffle 66, a damping telescopic rod 67, a spring 68, and a cover plate 69. The handle 61 serves as the main structure of the cutting tool 6. Its bottom end is fixedly connected to the limiting groove 41 at the top of the tool holder 4 by a second fastening bolt 615. The limiting groove 41 and the locking structure at the bottom of the handle 61 cooperate to ensure the accurate positioning and stability of the cutting tool 6. A groove 62 is provided at the top of the handle 61, and openings 63 are provided on both sides of the groove 62. The tongue plate 64 is slidably disposed in the groove 62, and the end of the tongue plate 64 is connected to the blade 65 for directly cutting the sprue 71 inside the injection molded shell 7. Baffles 66 are connected to both sides of the tongue plate 64. The baffles 66 and the tongue plate 64 move together inside the groove 62 and the openings 63. A damping telescopic rod 67 is also provided at the top of the handle 61. A spring 68 is sleeved on the outside of the damping telescopic rod 67. The damping telescopic rod 67 and the spring 68 are both located inside the groove 62 and abut against the handle 61 and the baffle 66 respectively. A cover plate 69 is mounted on the top of the handle 61 via a first fastening bolt 612. The cover plate 69 closes the upper end of the groove 62, allowing for the replacement of the blade 65. It also restricts the vertical displacement of the tongue plate 64 and the baffle 66, ensuring that they can only slide horizontally. The tongue plate 64 has an clearance hole 611 inside, through which the first fastening bolt 612 passes. The clearance hole 611 is designed as an elongated hole, with a length greater than the horizontal travel length of the tongue plate 64, ensuring that the tongue plate 64 will not interfere with the first fastening bolt 612 during sliding. The upper surfaces of the tongue plate 64 and the baffle 66 are designed to be flush with each other and lower than the height of the groove 62, ensuring that the top of the tongue plate 64 and the baffle 66 will not contact the lower surface of the cover plate 69 when they move horizontally, ensuring smooth and unobstructed movement.

[0016] Work process: When cylinder 2 drives the cutter holder 4 and cutter 6 forward, causing the cutting edge 65 to contact and shear the sprue 71 of the injection molded shell 7, the shearing force is transmitted through the cutting edge 65 to the tongue plate 64 and the baffle 66. At this instant, the damping telescopic rod 67 and the spring 68 work together to provide an initial buffer resistance. This buffering process occurs in the early part of the shearing stroke, allowing the cutting edge 65 to maintain sufficient shearing force while having a slight yielding and adaptive capability. This flexible start shearing method can effectively prevent the material of the sprue 71 from being damaged by the instantaneous rigid impact. Tearing or whitening stress marks are generated, thus ensuring the flatness and smoothness of the cut at the separation point between the sprue 71 and the injection shell 7 body, which significantly improves the molding quality and yield of the product. When the blade 65 needs to be replaced later, the first fastening bolt 612 can be unscrewed and the cover plate 69 can be removed. Then, the tongue plate 64, blade 65, baffle 66, damping telescopic rod 67, and spring 68 can be taken out from the inside of the groove 62. Replace the tongue plate 64, blade 65, and baffle 66 with new ones. The damping telescopic rod 67 and spring 68 can be reinstalled in the groove 62 without replacement.

[0017] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel pneumatic sprue shearing mechanism, comprising a base (1), a cylinder (2) mounted on the top of the base (1), a cutter holder (4) slidably connected to the top of the base (1) via a linear guide rail (3), a workstation (5) mounted on the top of the base (1) for placing an injection molded shell (7), and a cutter (6) mounted on the top of the cutter holder (4) for shearing the sprue (71) inside the injection molded shell (7), wherein the telescopic end of the cylinder (2) is connected to the cutter holder (4), characterized in that, The cutting tool (6) includes a handle (61) mounted on the top of the tool holder (4). A tongue plate (64) is slidably provided on the top of the handle (61). A cutting edge (65) is connected to the end of the tongue plate (64), and baffles (66) are connected to both sides. A damping telescopic rod (67) is provided on the top of the handle (61). A spring (68) is sleeved on the outside of the damping telescopic rod (67). The damping telescopic rod (67) and the spring (68) abut against the handle (61) and the baffles (66). A cover plate (69) is installed on the top of the handle (61).

2. The novel pneumatic water-cutting mechanism according to claim 1, characterized in that, The top of the tool holder (4) is provided with a limiting groove (41), and a first threaded hole (42) is provided inside the limiting groove (41). The bottom end of the tool holder (61) is engaged inside the limiting groove (41) and is provided with a second recessed hole (614). A second fastening bolt (615) is inserted inside the second recessed hole (614) and is threadedly connected to the first threaded hole (42).

3. The novel pneumatic water-cutting mechanism according to claim 1, characterized in that, The top of the handle (61) is provided with a groove (62), and openings (63) are provided on both sides of the groove (62). The tongue plate (64) and the baffle (66) are both movable inside the groove (62) and the openings (63). The damping telescopic rod (67) and the spring (68) are both located inside the groove (62).

4. The novel pneumatic water-cutting mechanism according to claim 3, characterized in that, The cover plate (69) has a first recessed hole (610) inside, and a first fastening bolt (612) is inserted inside the first recessed hole (610). The bottom end of the groove (62) has a second threaded hole (613). The first fastening bolt (612) is threadedly connected to the second threaded hole (613) to fix the cover plate (69) to the top of the handle (61).

5. The novel pneumatic water-cutting mechanism according to claim 4, characterized in that, The tongue plate (64) has an clearance hole (611) inside, and the first fastening bolt (612) passes through the clearance hole (611). The clearance hole (611) is set as an elongated hole and its length is greater than the stroke length of the tongue plate (64) in horizontal movement.

6. The novel pneumatic water-cutting mechanism according to claim 3, characterized in that, The upper surfaces of the tongue plate (64) and the baffle (66) are flush and lower than the height of the groove (62) so that they do not contact the lower surface of the cover plate (69) when the tongue plate (64) and the baffle (66) move horizontally.

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