Automatic cutting device for injection mold

Abstract

This utility model discloses an automatic cutting device for injection molds, including a mold base and a mounting base. A sprue pipe is fixedly installed on the mold base, and an injection pipe is fixedly installed on the mounting base. The injection pipe and the sprue pipe are arranged correspondingly, and a connecting pipe is provided between the injection pipe and the sprue pipe. Three sets of annularly distributed guide rails are fixedly installed inside the mounting base. Adjusting frames are slidably installed in each of the three sets of guide rails. Blades are installed on each of the three sets of adjusting frames, and adjusting rods are fixedly installed on each of the three sets of adjusting frames. An adjusting disc is rotatably installed inside the mounting base. The adjusting disc has three sets of annularly distributed adjusting grooves. The three sets of blades achieve radial synchronous movement through the single adjusting disc and the three sets of annularly distributed arc-shaped adjusting grooves, ensuring that the annularly distributed gates are cut off under the same time sequence and equal force, completely eliminating product deformation, burrs on the cross-section, or residual material threads caused by action deviation.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an automatic cutting device for injection molds. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. In the field of injection molding, especially when producing plastic parts with a central gate or multiple annular gates, such as cup lids, gears, and certain electronic device housings, the gate (commonly known as a "sprue") is usually still connected to the plastic part body through small connection points after demolding. This requires processing the sprue head in subsequent processes. Traditionally, this process relies mainly on manual trimming or punching to remove these sprue heads in later stages. This method is not only inefficient and increases labor costs, but it also easily causes scratches and deformations to the surface of the plastic part during operation, resulting in poor product consistency and certain safety hazards.

[0003] Existing cutting devices mostly use independently driven single cutting units or simple lever structures, which cannot achieve precise synchronous cutting of multiple gates. When processing multiple gates distributed in a ring, the timing deviation of each cutting unit's action can easily lead to uneven force on the product, uneven cutting surface, or residual material strands. Moreover, the cutting blade, as a high-frequency wear part, needs to be replaced regularly. However, existing devices often rigidly fix the blade to the driving component or embed it deeply inside the mold. When replacing it, a large number of related components need to be disassembled, resulting in long downtime and high maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide an automatic cutting device for injection molds to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic cutting device for injection molds, comprising a mold base and a mounting base. A sprue pipe is fixedly installed on the mold base and is fixedly connected to the mounting base. An injection tube is fixedly installed on the mounting base, with the injection tube corresponding to the sprue pipe. A connecting pipe is provided between the injection tube and the sprue pipe, and the connecting pipe is slidably connected to the injection tube and movably engaged with the sprue pipe. Three sets of annularly distributed guide rails are fixedly installed inside the mounting base, and each of the three sets of guide rails is slidably mounted within the guide rails. The device is equipped with three sets of adjusting frames, each with a blade mounted on it. The blades are designed to fit snugly against the upper end of the sprue. Each set of adjusting frames has a fixed adjusting rod. An adjusting disc is rotatably mounted inside the mounting base. The adjusting disc has three sets of annularly distributed adjusting grooves, which correspond to the adjusting rods. The three sets of adjusting rods are slidably connected to the adjusting disc through their respective adjusting grooves. Two sets of sliding frames are slidably mounted inside the adjusting frames. Each set of sliding frames has a fixed insert rod, which is movably engaged with the corresponding blade.

[0006] As a further preferred embodiment of this technical solution, a gear ring is sleeved on the adjusting disc, a first rack is slidably installed in the mounting base, the first rack is meshed with a gear, a cylinder is fixedly installed in the mounting base, the first rack is fixedly connected to the output end of the cylinder piston rod, a circulating air pump is provided on the mounting base, the air outlet of the cylinder is connected to the air inlet of the circulating air pump through a purification pipeline, and the air outlet of the circulating air pump is connected to the air inlet of the cylinder through a high-pressure air pipe.

[0007] As a further preferred embodiment of this technical solution, a mounting rod is fixedly mounted on the mounting base, a first telescopic rod is slidably mounted inside the mounting rod, a second telescopic rod is slidably mounted inside the first telescopic rod, the end of the second telescopic rod away from the mounting rod is fixedly mounted to a connecting pipe, a threaded rod is rotatably mounted inside the mounting rod, the lower end of the threaded rod passes through the first telescopic rod and is threadedly connected to the first telescopic rod, and the lower end of the threaded pipe passes through the second telescopic rod and is threadedly connected to the second telescopic rod.

[0008] As a further preferred embodiment of this technical solution, the threaded rod is provided with two sets of symmetrically distributed keyways, and the threaded tube is provided with two sets of symmetrically distributed key blocks. The key blocks are correspondingly arranged with the keyways, and the threaded tube is slidably sleeved with the threaded rod through the key blocks and keyways.

[0009] As a further preferred embodiment of this technical solution, a first spring is sleeved on each of the two sets of insert rods. The two ends of the first spring are fixedly connected to the insert rod and the adjusting frame, respectively. A second rack is fixedly installed on each of the two sets of slides. A gear is provided between the two sets of second racks. The gear is rotatably connected to the adjusting frame through the handle. The two sets of slides are centrally symmetrical about the handle.

[0010] As a further preferred embodiment of this technical solution, the gears are respectively meshed with two sets of second racks, and a torsion spring is sleeved on the handle, with both ends of the torsion spring being fixedly connected to the gear and the adjustment frame, respectively.

[0011] As a further preferred embodiment of this technical solution, a slide rod corresponding to the slide is fixedly installed inside the adjusting frame. The slide is slidably connected to the corresponding slide rod. Two sets of symmetrically distributed second springs are sleeved on the slide rod. The two ends of the second springs are fixedly connected to the slide and the adjusting frame, respectively.

[0012] This utility model provides an automatic cutting device for injection molds, which has the following advantages:

[0013] (1) In this utility model, the three sets of blades achieve radial synchronous movement through a single adjusting disc and three sets of arc-shaped adjusting grooves distributed in a ring, ensuring that the ring-shaped gate is cut off under the same time sequence and equal force, completely eliminating the problems of product deformation, burrs on the cross-section or residual material strands caused by action deviation, improving the product qualification rate. Moreover, the integrated linkage mechanism, namely the adjusting disc driving three sets of adjusting rods and adjusting frame, replaces multiple independent driving units, reducing the space occupied by the cutting device. The sliding connection between the connecting pipe and the injection pipe and the sprue pipe, and the sealing pressure adjusted by the double-stage threaded rod and threaded pipe, avoids overflow caused by thermal expansion and contraction or mold closing vibration, extending the device life. Before the three sets of blades feed inward synchronously to achieve automatic cutting, the first telescopic rod and the second telescopic rod drive the connecting pipe to slide away from the sprue pipe to avoid the connecting pipe affecting the cutting work of the three sets of blades feeding inward synchronously.

[0014] (2) The blade of this utility model is modularly installed by inserting a rod and locking with a spring. When replacing, only the handle needs to be rotated to unlock it. There is no need to disassemble the adjustment frame or linkage components, which shortens the maintenance time and reduces downtime losses. At the same time, the cylinder drives the first rack and toothed ring mechanism in conjunction with the air circulation system, namely the purification pipeline and the circulating air pump, to reduce energy consumption and reduce dependence on external air sources, which is in line with the trend of green manufacturing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram showing the structural separation of the mold base and the mounting base of this utility model;

[0017] Figure 3 This is a schematic diagram showing the structural separation of the mounting base and the adjustment frame of this utility model;

[0018] Figure 4 For the present utility model Figure 3 Enlarged view of the structure at point A;

[0019] Figure 5 This is a schematic diagram of the internal structure of the mounting rod of this utility model;

[0020] Figure 6 For the present utility model Figure 5 Enlarged view of the structure at point -B;

[0021] Figure 7 This is a schematic diagram showing the structural separation of the adjustment frame and the blade of this utility model;

[0022] Figure 8 For the present utility model Figure 7 Enlarged view of the structure at point C;

[0023] In the diagram: 1. Mold base; 2. Mounting base; 3. Sprue pipe; 4. Injection pipe; 5. Connecting pipe; 6. Guide rail; 7. Adjusting frame; 8. Blade; 9. Adjusting rod; 10. Adjusting disc; 11. Gear ring; 12. First rack; 13. Cylinder; 14. Circulating air pump; 15. Adjusting groove; 16. Mounting rod; 17. First telescopic rod; 18. Second telescopic rod; 19. Threaded rod; 20. Keyway; 21. Threaded pipe; 22. Key block; 23. Slide; 24. Insert rod; 25. First spring; 26. Second rack; 27. Gear; 28. Handle; 29. ​​Torsion spring; 30. Slide rod; 31. Second spring. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] This utility model provides a technical solution: such as Figures 1-6As shown in this embodiment, an automatic cutting device for injection molds includes a mold base 1 and a mounting base 2. A sprue pipe 3 is fixedly installed on the mold base 1 and is fixedly connected to the mounting base 2. An injection pipe 4 is fixedly installed on the mounting base 2, corresponding to the sprue pipe 3. A connecting pipe 5 is provided between the injection pipe 4 and the sprue pipe 3, and the connecting pipe 5 is slidably connected to the injection pipe 4 and movably engaged with the sprue pipe 3. Three sets of annularly distributed guide rails 6 are fixedly installed inside the mounting base 2. Adjusting frames 7 are slidably installed in each of the three sets of guide rails 6. Blades 8 are installed on each of the three sets of adjusting frames 7, and the blades 8 can be fitted against the upper end of the sprue pipe 3. Adjusting rods 9 are fixedly installed on each of the three sets of adjusting frames 7. An adjusting disc 10 is rotatably installed inside the mounting base 2 for adjustment. The disc 10 has three sets of annularly distributed adjustment grooves 15, which are correspondingly arranged with the adjustment rods 9. The three sets of adjustment rods 9 are slidably connected to the adjustment disc 10 through the corresponding adjustment grooves 15. Two sets of slides 23 are slidably installed in the adjustment frame 7. Insert rods 24 are fixedly installed on both sets of slides 23. The two sets of insert rods 24 are respectively engaged with the corresponding blades 8. A toothed ring 11 is sleeved on the adjustment disc 10. A first rack 12 is slidably installed in the mounting base 2. The first rack 12 is meshed with a gear 27. A cylinder 13 is fixedly installed in the mounting base 2. The first rack 12 is fixedly connected to the output end of the piston rod of the cylinder 13. A circulating air pump 14 is provided on the mounting base 2. The air outlet of the cylinder 13 is connected to the air inlet of the circulating air pump 14 through a purification pipeline. The air outlet of cylinder 14 is connected to the air inlet of cylinder 13 via a high-pressure air pipe. A mounting rod 16 is fixedly mounted on mounting base 2. A first telescopic rod 17 is slidably mounted inside mounting rod 16, and a second telescopic rod 18 is slidably mounted inside the first telescopic rod 17. The end of the second telescopic rod 18 furthest from mounting rod 16 is fixedly mounted to connecting pipe 5. A threaded rod 19 is rotatably mounted inside mounting rod 16. The lower end of threaded rod 19 passes through the first telescopic rod 17 and is threadedly connected to it. The lower end of threaded pipe 21 passes through the second telescopic rod 18 and is threadedly connected to it. Two sets of symmetrically distributed keyways 20 are provided on threaded rod 19. Two sets of symmetrically distributed key blocks 22 are provided inside threaded pipe 21. The key blocks 22 are correspondingly arranged with the keyways 20. Threaded pipe 21 is connected to keyways 20 via keyways 20. Block 22 and keyway 20 are slidably fitted with threaded rod 19. After injection molding and before the plastic part is ejected, the motor in mounting rod 16 drives threaded rod 19 to rotate, which is converted into axial thrust through nested threaded tube 21. When threaded rod 19 rotates, first telescopic rod 17 slides upward in mounting rod 16. When threaded tube 21 rotates, second telescopic rod 18 slides in first telescopic rod 17, pushing connecting tube 5 to slide towards injection tube 4, so that connecting tube 5 is disengaged from sprue tube 3, forming a cutting gap. Cylinder 13 pushes first rack 12 to move linearly, meshing drive gear ring 11 to drive annular adjusting disc 10 to rotate. The three sets of arc-shaped adjusting grooves 15 on adjusting disc 10 synchronously push radial adjusting rod 9, so that the three sets of annularly distributed blades 8 are precisely gathered towards the center along the guide rail.The blade 8 closes at the upper end of the central sprue pipe 3, cutting off all the annularly distributed sprue heads in one go. Simultaneously, the dual-stage telescopic structure of the threaded rod 19 and threaded pipe 21 dynamically compensates for the thermal expansion of the injection molding process, maintaining constant pressure on the sealing surface and preventing material leakage. Meanwhile, the exhaust from the cylinder 13, after purification and filtration, is pressurized and recycled back to the air inlet by an air pump, achieving closed-loop utilization of compressed air and reducing energy consumption.

[0026] like Figure 7 and Figure 8 As shown, each of the two sets of insert rods 24 is fitted with a first spring 25. The two ends of the first spring 25 are fixedly connected to the insert rod 24 and the adjusting frame 7, respectively. Each of the two sets of slides 23 is fixedly mounted with a second rack 26. A gear 27 is provided between the two sets of second racks 26. The gear 27 is rotatably connected to the adjusting frame 7 through a handle 28. The two sets of slides 23 are centrally symmetrically distributed about the handle 28. The gear 27 meshes with the two sets of second racks 26, respectively. A torsion spring 29 is fitted on the handle 28. The two ends of the torsion spring 29 are fixedly connected to the gear 27 and the adjusting frame 7, respectively. A slide corresponding to the slide 23 is fixedly installed inside the adjusting frame 7. The rod 30 and the slide 23 are slidably connected to the corresponding slide rod 30. Two sets of symmetrically distributed second springs 31 are sleeved on the slide rod 30. The two ends of the second springs 31 are fixedly connected to the slide 23 and the adjusting frame 7, respectively. Rotating the handle 28 on the adjusting frame 7 drives the double-sided gear 27 to make the two sets of second racks 26 move in opposite directions. The second racks 26 drive the insert rod 24 to disengage from the tail slot of the blade 8, release the mechanical lock, pull out the old blade 8 laterally, insert the new blade 8 into the positioning surface, release the handle 28, and the first spring 25, the second spring 31 and the torsion spring 29 push the insert rod 24 to automatically engage with the locking slot of the blade 8, completing the tool-free replacement.

[0027] This utility model provides an automatic cutting device for injection molds. The specific working principle is as follows: After the injection mold opens and before the plastic part is ejected, the motor inside the mounting rod 16 drives the threaded rod 19 to rotate. This rotation is converted into axial thrust through the nested threaded tube 21. When the threaded rod 19 rotates, the first telescopic rod 17 slides upward within the mounting rod 16. When the threaded tube 21 rotates, the second telescopic rod 18 slides within the first telescopic rod 17, pushing the connecting tube 5 towards the injection tube 4, causing the connecting tube 5 to disengage from the sprue tube 3, forming a cutting gap. The cylinder 13 pushes the first rack 12 to move linearly, engaging the drive ring 11 to rotate the annular adjusting disc 10. The three sets of arc-shaped adjusting grooves 15 on the adjusting disc 10 simultaneously push the radial adjusting rod 9, causing the three annularly distributed blades 8 to precisely converge towards the center along the guide rail. The blade 8 closes at the upper end of the central sprue pipe 3, cutting off all the sprue heads distributed in the ring at once. At the same time, the dual-stage telescopic structure of the threaded rod 19 and threaded pipe 21 dynamically compensates for the thermal expansion of the injection molding, maintaining constant pressure on the sealing surface and preventing material leakage. The exhaust from the cylinder 13 is purified and filtered, and then pressurized and recovered to the air inlet by the air pump, realizing closed-loop utilization of compressed air and reducing energy consumption. The handle 28 on the rotating adjustment frame 7 drives the double-sided gear 27 to move the two sets of second racks 26 in opposite directions. The second racks 26 drive the insert rod 24 to disengage from the slot at the tail of the blade 8, releasing the mechanical lock. The old blade 8 is pulled out laterally, and the new blade 8 is inserted into the positioning surface. The handle 28 is released, and the first spring 25, the second spring 31, and the torsion spring 29 push the insert rod 24 to automatically engage with the locking slot of the blade 8, completing the tool-free replacement.

[0028] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic cutting-off device for injection molds, comprising a mold seat (1) and a mounting seat (2), characterized in that: A sprue pipe (3) is fixedly installed on the mold base (1). The sprue pipe (3) is fixedly connected to the mounting base (2). An injection molding pipe (4) is fixedly installed on the mounting base (2). The injection molding pipe (4) is correspondingly arranged with the sprue pipe (3). A connecting pipe (5) is provided between the injection molding pipe (4) and the sprue pipe (3). The connecting pipe (5) is slidably connected to the injection molding pipe (4). The connecting pipe (5) is movably snapped into the sprue pipe (3). Three sets of annularly distributed guide rails (6) are fixedly installed inside the mounting base (2). An adjusting frame (7) is slidably installed inside each of the three sets of guide rails (6). A blade (8) is installed on each of the three sets of adjusting frames (7). The blade (8) can be fitted to the upper end of the water inlet pipe (3). Each of the three sets of adjustment frames (7) is fixedly equipped with an adjustment rod (9). An adjustment plate (10) is rotatably installed in the mounting base (2). The adjustment plate (10) has three sets of annularly distributed adjustment grooves (15). The adjustment grooves (15) are correspondingly set with the adjustment rods (9). The three sets of adjustment rods (9) are slidably connected to the adjustment plate (10) through the corresponding adjustment grooves (15). Two sets of slides (23) are slidably installed in the adjustment frame (7). Each of the two sets of slides (23) is fixedly equipped with a plug rod (24). The two sets of plug rods (24) are respectively movably engaged with the corresponding blade (8).

2. An automatic cutting device for injection mold according to claim 1, characterized in that: A gear ring (11) is fitted onto the adjusting plate (10). A first rack (12) is slidably installed in the mounting base (2). The first rack (12) meshes with a gear (27). A cylinder (13) is fixedly installed in the mounting base (2). The first rack (12) is fixedly connected to the output end of the piston rod of the cylinder (13). A circulating air pump (14) is provided on the mounting base (2). The air outlet of the cylinder (13) is connected to the air inlet of the circulating air pump (14) through a purification pipeline. The air outlet of the circulating air pump (14) is connected to the air inlet of the cylinder (13) through a high-pressure air pipe.

3. An automatic cutting device for injection mold according to claim 1, characterized in that: An installation rod (16) is fixedly installed on the mounting base (2). A first telescopic rod (17) is slidably installed inside the installation rod (16). A second telescopic rod (18) is slidably installed inside the first telescopic rod (17). The end of the second telescopic rod (18) away from the installation rod (16) is fixedly installed with the connecting pipe (5). A threaded rod (19) is rotatably installed inside the installation rod (16). The lower end of the threaded rod (19) passes through the first telescopic rod (17) and is threadedly connected to the first telescopic rod (17). The mounting base (2) also includes a threaded pipe (21). The lower end of the threaded pipe (21) passes through the second telescopic rod (18) and is threadedly connected to the second telescopic rod (18).

4. An automatic cutting device for injection mold according to claim 3, characterized in that: The threaded rod (19) has two sets of symmetrically distributed keyways (20), and the threaded tube (21) has two sets of symmetrically distributed key blocks (22). The key blocks (22) are correspondingly arranged with the keyways (20), and the threaded tube (21) is slidably connected to the threaded rod (19) through the key blocks (22) and the keyways (20).

5. The automatic cut-off device for injection mold according to claim 1, characterized in that: Both sets of the insert rods (24) are fitted with a first spring (25). The two ends of the first spring (25) are fixedly connected to the insert rod (24) and the adjusting frame (7) respectively. Both sets of the slides (23) are fixedly installed with a second rack (26). A gear (27) is provided between the two sets of second racks (26). The gear (27) is rotatably connected to the adjusting frame (7) through the handle (28). The two sets of slides (23) are centrally symmetrical about the handle (28).

6. An automatic cutting device for injection molds according to claim 5, characterized in that: The gear (27) is meshed with two sets of second racks (26) respectively. A torsion spring (29) is sleeved on the handle (28). The two ends of the torsion spring (29) are fixedly connected to the gear (27) and the adjusting frame (7) respectively.

7. The automatic cutting device for injection molds according to claim 1, characterized in that: The adjusting frame (7) is fixedly installed with a slide rod (30) corresponding to the slide (23). The slide (23) and the corresponding slide rod (30) are slidably connected. Two sets of symmetrically distributed second springs (31) are sleeved on the slide rod (30). The two ends of the second springs (31) are fixedly connected to the slide (23) and the adjusting frame (7) respectively.

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