An automatic plastic part gate-cutting device and process

Abstract

The present invention relates to the field of water-cutting, and in particular to a fully automatic water-cutting device and process for plastic parts, wherein the fully automatic water-cutting device for plastic parts comprises a chassis, a base is fixed to the bottom inner wall of the chassis, a rotating worktable is connected to the top of the base by rotation and embedding, a lower mold assembly for positioning plastic parts is fixed at an equal angle on the rotating worktable, the lower mold assembly comprises a lower mold body, and a clearance gap for avoiding the water outlet of the plastic parts is provided at the bottom of the lower mold body. The fully automatic water-cutting device for plastic parts integrates multiple processes such as positioning, clamping, water-cutting and placing of plastic parts, realizes a fully automated operation process, greatly improves production efficiency, and reduces the complexity and labor intensity of manual operation. Only a secondary telescopic rod combined with the rest of the pure mechanical structure is needed to complete the mold closing, water-cutting and rotation of the rotating worktable, and the failure rate of electrical equipment is greatly reduced, which is convenient for debugging.

Description

Technical Field

[0001] The present invention relates to the field of gate cutting, and particularly to a fully automatic gate cutting device and process for plastic parts. Background Art

[0002] The outer shells of smart wearable products are usually injection molded with plastics, but gates will be generated during the injection molding process, and the number of gates may be one or more. At present, the process of cutting these gates often requires manual assistance, resulting in low efficiency. During the punching process, steps such as mold clamping and punching require multiple electrical components to cooperate with each other, which not only makes the debugging process complicated but also increases the failure rate. Since the gates are usually arranged inside the plastic parts of the housing, and the edge of the housing protrudes inward, the cutting tool needs to be embedded inside the housing to complete the cutting. In order to achieve this purpose, the existing cutting tools need to be displaced by driving devices in multiple directions, which makes the equipment cost relatively high.

[0003] Therefore, it is necessary to provide a fully automatic gate cutting device and process for plastic parts to solve the above technical problems. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a fully automatic gate cutting device and process for plastic parts.

[0005] A fully automatic gate cutting device for plastic parts provided by the present invention includes a machine case. A base is fixedly arranged on the inner wall of the bottom of the machine case. A rotary worktable is rotationally and embeddedly connected to the top of the base. The rotary worktable is fixedly provided with a lower mold assembly for positioning plastic parts at equal angles. The lower mold assembly includes a lower mold body. A relief notch for avoiding the gates of the plastic parts is arranged at the bottom of the lower mold body. A secondary telescopic rod is installed on the inner wall of the top of the machine case. An upper mold assembly for cooperating with the lower mold assembly to fix the plastic parts is arranged on the side wall of the thick piston rod of the secondary telescopic rod. A U-shaped rod is fixedly arranged on the side wall of the thick piston rod of the secondary telescopic rod. A driving groove for cooperating with the end of the U-shaped rod is arranged on the side wall of the rotary worktable. When the U-shaped rod moves up and down reciprocally, the rotary worktable rotates intermittently. A first driving block is fixedly arranged at the end of the thin piston rod of the secondary telescopic rod. A through hole is arranged at the center of the rotary worktable. The center of the top of the base extends to the top end of the through hole. A cutting assembly for cutting the gates of the plastic parts is arranged at the center of the top of the base, and the first driving block cooperates with the cutting assembly.

[0006] Preferably, the driving grooves are arranged at equal angles on the upper vertical part of the side wall of the rotary worktable, at equal angles on the lower vertical part of the side wall of the rotary worktable, and the left inclined part and the right inclined part connecting the upper vertical part and the lower vertical part.

[0007] Preferably, the end of the U-shaped rod is cylindrical, the widths of the lower vertical part and the upper vertical part are equal, and the diameter of the end of the U-shaped rod is 0.1 mm less than the width of the upper vertical part.

[0008] Preferably, the lower die assembly further includes support legs fixed to the four corners of the bottom of the lower die body, and the support legs are fixedly connected to the rotary table. An avoidance space is provided between the lower die body and the rotary table. The upper die assembly includes an L-shaped rod fixed to the side wall of the thick piston rod of the secondary telescopic rod and an upper die body fixed to the end of the L-shaped rod.

[0009] Preferably, plastic part profiling grooves are provided on both the upper die body and the lower die body.

[0010] Preferably, the cutting assembly includes mounting plates symmetrically fixed to the top of the rotary table. Horizontal chutes are provided on the mounting plates. A second driving block is provided between the two mounting plates. Inclined surfaces that cooperate with each other are provided on both the second driving block and the first driving block. A square convex portion is provided on the side wall of the second driving block, and the square convex portion is slidably connected in the horizontal chute. A U-shaped frame is provided between the two mounting plates. Cylindrical blocks are provided on both side walls of the U-shaped frame. Guide grooves are provided on the side walls of the mounting plates, and the cylindrical blocks are arranged in the guide grooves. A vertical guide rail is provided on the second driving block, and the U-shaped frame is slidably connected to the vertical guide rail. A cutting knife for cutting the sprue of the plastic part is fixed to the U-shaped frame.

[0011] Preferably, the guide groove includes an ascending groove and a horizontal groove provided at the top end of the ascending groove, and the ascending groove is inclined.

[0012] Preferably, windows for loading and unloading are provided on both sides of the chassis.

[0013] Preferably, at least one cutting knife is provided.

[0014] A full-automatic sprue cutting process for plastic parts includes the following steps:

[0015] S1: Loading of plastic parts: The plastic parts to be cut with sprues are taken from the injection molding machine by the first manipulator and placed on the conveyor belt, and the plastic parts on the conveyor belt are placed into one of the lower die bodies by the second manipulator;

[0016] S2: Closing the die and fixing the plastic parts: The plastic parts are fixed by the extrusion cooperation between the lower die body and the upper die body;

[0017] S3: Cutting the sprue: The sprue of the plastic parts is cut off by the cutting assembly;

[0018] S4: Placing: The injection molded parts after cutting off the sprues are placed into the trays by the third manipulator;

[0019] The specific steps of step S3 include: driving the first driving block to extrude the second driving block through the thin piston rod of the secondary telescopic rod, the second driving block slides horizontally along the horizontal chute, the second driving block extrudes the U-shaped frame, so that the U-shaped frame moves along the guiding groove, first obliquely rises and then moves horizontally, and further enables the cutting knife to cut the water inlet and outlet.

[0020] Compared with the related technology, the present invention has the following beneficial effects:

[0021] High efficiency and automation: The equipment integrates multiple processes such as plastic part positioning, clamping, water inlet and outlet cutting, and placement, realizing a fully automated operation process, greatly improving production efficiency, and reducing the complexity and labor intensity of manual operation.

[0022] Reduced failure rate: Only one secondary telescopic rod combined with the rest of the pure mechanical structure can complete mold closing, water inlet and outlet cutting, and the rotation of the rotary table. The failure rate of electrical equipment is greatly reduced, which is convenient for debugging.

[0023] Intermittent rotation design: The ingenious cooperation between the U-shaped rod and the driving groove enables the rotary table to achieve intermittent rotation. This not only enables different lower die components to cooperate with the upper die component, but also optimizes the overall layout and movement trajectory of the equipment, improving space utilization.

[0024] Excellent cutting effect and low cost: The design of the cutting component fully considers the movement trajectory of the cutting knife and the characteristics of the plastic part. Through the oblique rise and horizontal movement of the U-shaped frame, the cutting knife can accurately cut the water inlet and outlet, while avoiding damage to other parts of the plastic part. The cutting effect is more excellent and the cost is low. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the internal structure of the chassis of the present invention;

[0026] Figure 2 It is a schematic diagram of the relative position of the secondary telescopic rod and the rotary table of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the rotary table of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the first driving block of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the lower die body of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the cutting component of the present invention;

[0031] Figure 7 It is a schematic diagram of the inner side structure of the mounting plate of the present invention;

[0032] Figure 8 Schematic diagram of the relative positions of the second driving block and the U-shaped frame of the present invention;

[0033] Figure 9 Schematic diagram of the overall structure of the present invention;

[0034] Figure 10 Schematic diagram of the structure of the U-shaped frame of the present invention.

[0035] Reference numerals in the figure: 1, chassis; 2, base; 3, rotary worktable; 4, lower die body; 5, secondary telescopic rod; 6, U-shaped rod; 7, first driving block; 8, support leg; 9, L-shaped rod; 10, upper die body; 11, mounting plate; 12, second driving block; 13, U-shaped frame; 14, cutting knife; 15, lower die assembly; 16, avoidance notch; 17, upper die assembly; 18, thick piston rod; 19, driving groove; 20, thin piston rod; 21, through hole; 22, cutting assembly; 23, upper vertical part; 24, lower vertical part; 25, left inclined part; 26, right inclined part; 27, horizontal sliding groove; 28, inclined surface; 29, square convex part; 30, cylindrical block; 31, guiding groove; 32, vertical guide rail; 33, rising groove; 34, horizontal groove; 35, window. Detailed implementation mode

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Please refer to Figures 1 to 10 , a fully automatic plastic part gate cutting device, including a chassis 1, and a base 2 is firmly fixed to the inner wall of the bottom of the chassis. On the top of the base 2, a rotary worktable 3 is installed through a rotational embedded connection. On this rotary worktable 3, a series of lower die assemblies 15 for positioning plastic parts are fixed at equal angles. Each lower die assembly 15 includes a lower die body 4, and a avoidance notch 16 is specially designed at the bottom of the lower die body 4 for avoiding the gate of the plastic part.

[0038] A secondary telescopic rod 5 is also installed on the inner wall of the top of the chassis 1. On the side wall of the thick piston rod 18 of this secondary telescopic rod, an upper die assembly 17 cooperating with the lower die assembly 15 is installed for fixing the plastic part. A U-shaped rod 6 is also fixed on the side wall of the thick piston rod 18, and a driving groove 19 cooperating with the end of the U-shaped rod 6 is provided on the side wall of the rotary worktable 3. In this way, when the U-shaped rod 6 moves up and down reciprocally, the rotary worktable 3 will rotate intermittently.

[0039] At the end of the thin piston rod 20 of the secondary telescopic rod 5, a first driving block 7 is fixed. At the center of the rotary table 3, a through hole 21 is provided, and the top center of the base 2 extends to the top end of this through hole 21. Here, a cutting assembly 22 for cutting the sprue of the plastic part is installed, and the first driving block 7 cooperates with this cutting assembly 22.

[0040] The driving grooves 19 are arranged at equal angles on the upper vertical part 23 on the side wall of the rotary table 3, at equal angles on the lower vertical part 24 on the side wall of the rotary table 3, and the left inclined part 25 and the right inclined part 26 connected between the upper vertical part 23 and the lower vertical part 24. And the lower vertical part 24 and the upper vertical part 23 are arranged at intervals.

[0041] During the working process of the equipment, when the thick piston rod 18 of the secondary telescopic rod 5 moves from top to bottom, the end of the U-shaped rod 6 will be located at the upper vertical part 23 and move down. At this time, the rotary table 3 will not rotate, and the upper die assembly 17 will move down. When the end of the U-shaped rod 6 moves to the left inclined part 25, it will contact the bottom of the left inclined part 25, so that the rotary table 3 rotates. Subsequently, when the end of the U-shaped rod 6 moves to the lower vertical part 24, the rotary table 3 will stop rotating again, and the upper die assembly 17 will continue to move down. When the end of the U-shaped rod 6 moves to the bottom end of the lower vertical part 24, the upper die assembly 17 will closely cooperate with the lower die assembly 15 to clamp the plastic part.

[0042] On the contrary, when the thick piston rod 18 of the secondary telescopic rod 5 moves from bottom to top, the end of the U-shaped rod 6 will move up along the lower vertical part 24. At this time, the rotary table 3 will not rotate either. But when the end of the U-shaped rod 6 moves to the right inclined part 26, the rotary table 3 will continue to rotate. When the end of the U-shaped rod 6 moves to the upper vertical part 23, the rotary table 3 will stop rotating again. Through this periodic up and down movement of the U-shaped rod 6, the rotary table 3 can achieve intermittent rotation, so that different lower die assemblies 15 can cooperate with the upper die assembly 17.

[0043] The end of the U-shaped rod 6 is cylindrical. The widths of the lower vertical part 24 and the upper vertical part 23 are equal. The diameter of the end of the U-shaped rod 6 is 0.1 mm smaller than the width of the upper vertical part 23. This enables the end of the U-shaped rod 6 to move smoothly in the driving groove 19.

[0044] The structure of the lower die assembly 15 is also very stable. It further includes support legs 8 fixed to the four corners at the bottom of the lower die body 4, and these support legs 8 are fixedly connected to the rotary worktable 3. Between the lower die body 4 and the rotary worktable 3, there is also an avoidance space for avoiding the cutting assembly 22. The upper die assembly 17 includes an L-shaped rod 9 fixed to the side wall of the thick piston rod 18 of the secondary telescopic rod 5, and an upper die body 10 fixed to the end of the L-shaped rod 9. Such a connection method makes the upper die assembly 17 very stable.

[0045] On both the upper die body 10 and the lower die body 4, there are plastic part profiling grooves, which can better clamp the plastic parts. When cutting the water inlet, the plastic parts can remain stationary, thus obtaining a better cutting effect.

[0046] The cutting assembly 22 includes mounting plates 11 symmetrically fixed to the top of the rotary worktable 3. The mounting plates 11 are provided with horizontal chutes 27. Between the two mounting plates 11, there is a second driving block 12. The second driving block 12 and the first driving block 7 are both provided with inclined surfaces 28 that cooperate with each other. The side wall of the second driving block 12 is provided with a square convex portion 29, and the square convex portion 29 is slidably connected in the horizontal chute 27. Between the two mounting plates 11, there is a U-shaped frame 13. Both side walls of the U-shaped frame 13 are provided with cylindrical blocks 30. The side wall of the mounting plate 11 is provided with a guiding groove 31, and the cylindrical blocks 30 are arranged in the guiding groove 31. The second driving block 12 is provided with a vertical guide rail 32, and the U-shaped frame 13 is slidably connected to the vertical guide rail 32. A cutting knife 14 for cutting the water inlet of the plastic part is fixed on the U-shaped frame 13.

[0047] The design of the guiding groove 31 is also very ingenious. It includes an ascending groove 33 and a horizontal groove 34 provided at the top end of the ascending groove 33. The ascending groove 33 is inclined. In this way, when the U-shaped frame 13 moves, it can first rise obliquely and then move horizontally, so that the cutting knife 14 can accurately cut the water inlet. The design of the U-shaped frame 13 rising obliquely is not only used to avoid the lower die body 4, but also to avoid the edge protruding parts of the plastic parts.

[0048] When the thin piston rod 20 of the secondary telescopic rod 5 extends, the thin piston rod 20 drives the first driving block 7 to squeeze the second driving block 12. The second driving block 12 slides horizontally along the horizontal chute 27. The second driving block 12 squeezes the U-shaped frame 13, causing the U-shaped frame 13 to move along the guiding groove 31. Due to the settings of the horizontal groove 34 and the ascending groove 33, the U-shaped frame 13 first rises obliquely and then moves horizontally, so that the cutting knife 14 cuts the water inlet. The purpose of the U-shaped frame 13 rising obliquely is not only to avoid the lower die body 4, but also to avoid the edge protruding parts of the plastic parts.

[0049] Windows 35 for loading and unloading are provided on both sides of the chassis 1, which is convenient for the robot to load and unload.

[0050] At least one cutting knife 14 is provided, which is set according to the actual number of gates, and the height of the cutting knife 14 is set according to the actual situation.

[0051] A full-automatic gate-cutting process for plastic parts includes the following steps:

[0052] S1: Feeding of plastic parts: The plastic parts to be gate-cut are taken from the injection molding machine by the first manipulator and placed on the conveyor belt, and the plastic parts on the conveyor belt are placed into one of the lower die bodies 4 by the second manipulator;

[0053] S2: Closing the mold and fixing the plastic parts: The plastic parts are fixed by the extrusion fit between the lower die body 4 and the upper die body 10;

[0054] S3: Gate-cutting: The gates of the plastic parts are cut off by the cutting assembly 22;

[0055] S4: Placing: The injection molded parts after gate-cutting are placed into the tray by the third manipulator;

[0056] The specific steps of step S3 include: driving the first driving block 7 to squeeze the second driving block 12 by the thin piston rod 20 of the secondary telescopic rod 5, the second driving block 12 slides horizontally along the horizontal chute 27, the second driving block 12 squeezes the U-shaped frame 13, so that the U-shaped frame 13 moves along the guide groove 31, first rises obliquely and then moves horizontally, thereby enabling the cutting knife 14 to cut the gate.

[0057] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A fully automatic watertight cutting device for plastic parts, characterized in that: The invention comprises a chassis, wherein a base (2) is fixed on the bottom inner wall of the chassis (1), and a rotating worktable (3) is connected to the top of the base (2) by rotation and embedding, and a lower mold assembly (15) for positioning a plastic part is fixed at an equal angle on the rotating worktable (3), and the lower mold assembly (15) comprises a lower mold body (4), and a relief notch (16) for avoiding a water outlet of the plastic part is provided at the bottom of the lower mold body (4), and a secondary telescopic rod (5) is installed on the top inner wall of the chassis (1), and an upper mold assembly (17) for cooperating with the lower mold assembly (15) to fix the plastic part is installed on the side wall of the thick piston rod (18) of the secondary telescopic rod (5), and the secondary telescopic rod (5) A U-shaped rod (6) is fixed to the side wall of the thick piston rod (18); a driving groove (19) is provided on the side wall of the rotating worktable (3) to cooperate with the end of the U-shaped rod (6); when the U-shaped rod (6) moves up and down, the rotating worktable (3) rotates intermittently; a first driving block (7) is fixed to the end of the thin piston rod (20) of the secondary telescopic rod (5); a through hole (21) is provided at the center of the rotating worktable (3); the top center of the base (2) extends to the top of the through hole (21); a cutting assembly (22) for cutting the water outlet of a plastic part is installed at the top center of the base (2), and the first driving block (7) cooperates with the cutting assembly (22).

2. The fully automatic watertight cutting equipment for plastic parts according to claim 1, characterized in that: The driving groove (19) is arranged at an equal angle on an upper vertical portion (23) of the side wall of the rotating worktable (3), and on a lower vertical portion (24) of the side wall of the rotating worktable (3), and on a left inclined portion (25) and a right inclined portion (26) connected between the upper vertical portion (23) and the lower vertical portion (24).

3. The fully automatic watertight cutting equipment for plastic parts according to claim 2, characterized in that: The end of the U-shaped rod (6) is cylindrical, the width of the lower vertical portion (24) and the upper vertical portion (23) are equal, and the diameter of the end of the U-shaped rod (6) is 0.1 mm smaller than the width of the upper vertical portion (23).

4. The fully automatic watertight cutting equipment for plastic parts according to claim 1, characterized in that: The lower mold assembly (15) further comprises support legs (8) fixed at the four corners of the bottom of the lower mold body (4), and the support legs (8) are fixedly connected to the rotating worktable (3), and an escape space is provided between the lower mold body (4) and the rotating worktable (3). The upper mold assembly (17) comprises an L-shaped rod (9) fixed to the side wall of the thick piston rod (18) of the secondary telescopic rod (5) and an upper mold body (10) at the end of the L-shaped rod (9) of the fixed seat.

5. The fully automatic watertight cutting device for plastic parts according to claim 4, characterized in that: The upper mold body (10) and the lower mold body (4) are both provided with plastic part profiling grooves.

6. The fully automatic watertight cutting equipment for plastic parts according to claim 1, characterized in that: The cutting assembly (22) comprises a mounting plate (11) symmetrically fixed on the top of the rotating worktable (3), a horizontal slide groove (27) is provided on the mounting plate (11), a second driving block (12) is provided between the two mounting plates (11), the second driving block (12) and the first driving block (7) are both provided with mutually matching inclined surfaces (28), the side wall of the second driving block (12) is provided with a square protrusion (29), and the square protrusion (29) is slidably connected to the horizontal slide groove (27) A U-shaped frame (13) is provided between the two mounting plates (11), and cylindrical blocks (30) are provided on both side walls of the U-shaped frame (13). A guide groove (31) is provided on the side wall of the mounting plate (11), and the cylindrical block (30) is arranged in the guide groove (31). A vertical guide rail (32) is provided on the second driving block (12), and the U-shaped frame (13) is slidably connected to the vertical guide rail (32). A cutting knife (14) for cutting a water outlet of a plastic part is fixed on the U-shaped frame (13).

7. The fully automatic watertight cutting equipment for plastic parts according to claim 6, characterized in that: The guide groove (31) comprises an ascending groove (33) and a horizontal groove (34) arranged at the top end of the ascending groove (33), and the ascending groove (33) is arranged obliquely.

8. The fully automatic watertight cutting equipment for plastic parts according to claim 1, characterized in that: Windows (35) for loading and unloading are provided on both sides of the machine case (1).

9. The fully automatic watertight cutting device for plastic parts according to claim 4, characterized in that: At least one cutting knife (14) is provided.

10. A water-cutting process using the fully automatic water-cutting equipment for plastic parts as claimed in claim 6, characterized in that: The steps include: S1: Plastic part loading: The plastic part to be cut into water outlet is taken from the injection molding machine by the first robot and placed on the conveyor belt. The plastic part on the conveyor belt is placed into one of the lower mold bodies (4) by the second robot; S2: clamping the mold to fix the plastic part: fixing the plastic part by extruding and fitting the lower mold body (4) and the upper mold body (10); S3: Cutting the water outlet: cutting the water outlet of the plastic part by using the cutting component (22); S4: Placement: The injection molded parts after the nozzle is cut off are placed in the tray by the third robot; The specific steps of step S3 include: driving the first driving block (7) to squeeze the second driving block (12) through the thin piston rod (20) of the secondary telescopic rod (5), the second driving block (12) slides horizontally along the horizontal slide groove (27), the second driving block (12) squeezes the U-shaped frame (13), so that the U-shaped frame (13) moves along the guide groove (31), first rises obliquely and then moves horizontally, thereby causing the cutting knife (14) to cut the water outlet.

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