Plastic sheet trimming circular knife device

Abstract

The utility model discloses a plastic sheet trimming circular knife device which comprises a machine frame, an upper knife shaft, a lower knife shaft, a circular knife, a knife shaft driving device, a knife positioning device, a knife rapid replacing device and a trimming precision adjusting device, the upper knife shaft and the lower knife shaft are arranged on the machine frame in parallel, the circular knife is installed on the upper knife shaft and the lower knife shaft, and the knife shaft driving device is arranged on the machine frame. The cutter shaft driving device is connected with the upper cutter shaft and the lower cutter shaft, the cutter positioning device and the cutter rapid replacing device are installed at the two ends of the upper cutter shaft and the lower cutter shaft, the trimming precision adjusting device is connected with the circular cutter, the motor drives the upper cutter shaft and the lower cutter shaft to rotate through the speed reducer and the transmission mechanism, and the driving belt wheel is installed on an output shaft of the motor. The driven belt wheel is installed on the upper cutter shaft and the lower cutter shaft, the driving belt is connected with the driving belt wheel and the driven belt wheel, and after the motor is started, the driving belt wheel drives the driven belt wheel to rotate through the driving belt, so that the upper cutter shaft and the lower cutter shaft are driven to rotate synchronously, and the edge cutting action of the circular cutter is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic production equipment, and in particular to a circular knife device for cutting edges of plastic sheets. Background Technology

[0002] With the rapid development of plastic processing technology, plastic sheet trimming equipment has gradually become one of the important pieces of equipment in the plastics industry due to its high efficiency and reliability in the production process. However, existing plastic sheet trimming equipment still has certain shortcomings in terms of trimming accuracy, stability, and maintenance costs, which affect production efficiency and product quality.

[0003] A search revealed a sheet slitting machine with publication number CN104275714B, published on February 8, 2017. This patent discloses a sheet slitting machine, including a frame and a strip feeding mechanism, a slitting device, and a strip winding mechanism mounted on it. The slitting device includes a cutter shaft support, upper and lower cutter shafts, a cutter shaft power device for driving the upper and lower cutter shafts, and several sets of shearing modules arranged at certain intervals between the upper and lower cutter shafts. Each shearing module consists of an upper cutter on the upper cutter shaft and a lower cutter on the lower cutter shaft. The upper and lower cutters are staggered with a horizontal spacing of 0-2mm, and the distance between the upper and lower cutter shafts is less than the sum of the radii of the upper and lower cutters. While this technical solution can achieve precise edge cutting of materials such as metal strips and plastic films, its complex multi-set shearing module design leads to high maintenance costs and inconvenient cutter replacement, affecting the flexibility of equipment use.

[0004] A search revealed a molding die with a laser cutting device, publication number CN105128319B, published on October 10, 2017. This patent discloses a molding die with a laser cutting device, including an upper die and a lower die. The lower surface of the upper die has a ring-shaped laser blade and a ring-shaped protrusion around its periphery, with the protrusion located outside the laser blade. The upper surface of the lower die has a corresponding ring-shaped anvil and a ring-shaped groove around its periphery. During molding and lifting control, the ring-shaped laser blade does not cut the plastic sheet but merely presses it tightly to form a seal, solving the sealing problem in vacuum forming. The ring-shaped groove and protrusion form an auxiliary seal, improving the stability of vacuum forming. The ring-shaped laser blade is directly mounted on the upper die, simplifying the structure and avoiding problems such as easy bending and incomplete cutting caused by a thin ring-shaped laser blade, resulting in neater and more stable cutting. However, while the ring-shaped laser blade improves cutting stability, in practical applications, its maintenance cost is high, and it is susceptible to thermal stress during long-term use, leading to decreased cutting accuracy and affecting product quality.

[0005] The above problems indicate that existing plastic sheet trimming equipment still has certain shortcomings in terms of trimming accuracy, maintenance costs, and equipment stability. Utility Model Content

[0006] The purpose of this invention is to provide a circular knife device for cutting edges of plastic sheets, so as to overcome the shortcomings of the existing technology.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A circular blade device for edge trimming plastic sheets solves the problems of low trimming accuracy, high maintenance costs, and poor equipment stability in existing plastic sheet edge trimming equipment. This utility model aims to provide a novel circular blade device for edge trimming plastic sheets that is simple in structure, low in maintenance costs, and offers high trimming accuracy and good stability, thereby meeting the demand for efficient and high-precision edge trimming equipment in the plastics processing industry.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problems is:

[0010] A circular blade device for trimming edges of plastic sheets includes a frame, an upper blade shaft, a lower blade shaft, a circular blade, a blade shaft drive device, a blade positioning device, a blade quick-change device, and a trimming accuracy adjustment device. The upper and lower blade shafts are arranged parallel to each other on the frame, and the circular blade is mounted on the upper and lower blade shafts. The blade shaft drive device is connected to the upper and lower blade shafts. The blade positioning device and the blade quick-change device are installed at both ends of the upper and lower blade shafts, and the trimming accuracy adjustment device is connected to the circular blade.

[0011] The aforementioned cutter shaft drive device includes a motor, a reducer, and a transmission mechanism. The motor is mounted outside the frame and connected to the transmission mechanism via the reducer. The transmission mechanism includes a drive pulley, a driven pulley, and a transmission belt. The drive pulley is mounted on the motor output shaft, and the driven pulley is mounted on the upper and lower cutter shafts. The transmission belt connects the drive pulley and the driven pulley. The motor drives the upper and lower cutter shafts to rotate via the transmission mechanism.

[0012] The tool positioning device includes a positioning pin, a positioning pin sleeve, and a positioning spring. The positioning pin is fixed on the frame, the positioning pin sleeve is installed on the shaft ends of the upper and lower tool shafts, and the positioning spring is installed between the positioning pin and the positioning pin sleeve. When the circular cutter is installed on the upper and lower tool shafts, the positioning pin is inserted into the positioning pin sleeve. Through the elastic action of the positioning spring, the axial positioning accuracy of the circular cutter during the cutting process is ensured.

[0013] The aforementioned quick-change tool device includes a quick-change fixture, a fixture drive mechanism, and a fixture positioning pin. The quick-change fixture is installed on the shaft ends of the upper and lower tool shafts. The fixture drive mechanism includes a cylinder and a connecting rod. The cylinder is installed on the frame and connected to the quick-change fixture via the connecting rod. The fixture positioning pin is installed on the quick-change fixture. When it is necessary to change the circular tool, the cylinder drives the quick-change fixture to move via the connecting rod, and the fixture positioning pin retracts from the shaft ends of the upper and lower tool shafts, completing the quick change of the circular tool.

[0014] The edge-cutting accuracy adjustment device includes an adjusting screw, an adjusting nut, and an adjusting spring. The adjusting screw is mounted on the machine frame, the adjusting nut is mounted on the blade holder of the circular blade, and the adjusting spring is installed between the adjusting screw and the adjusting nut. By rotating the adjusting screw, the position of the adjusting nut is adjusted, thereby adjusting the edge-cutting position of the circular blade to ensure edge-cutting accuracy.

[0015] Preferably, the circular cutter adopts a double-edged structure, with the two cutting edges of each circular cutter symmetrically arranged at a certain angle. Two horizontal circular cutters are mounted on the ends of the upper and lower cutter shafts, and the distance between the cutting edges of the two circular cutters is adjustable to adapt to the edge cutting requirements of plastic sheets of different thicknesses. The double-edged structure design makes the cutting force generated during the edge cutting process more uniform, improving the stability of the edge cutting.

[0016] Preferably, the cutter shaft drive device further includes an overload protection device, which includes a torque limiter and a torque sensor. The torque limiter is installed between the reducer and the transmission mechanism, and the torque sensor is installed on the torque limiter. When an overload occurs during the cutter shaft drive process, the torque sensor detects the overload signal and sends it to the main control system. The main control system controls the start and stop of the motor to achieve overload protection and prevent the cutter shaft from being damaged due to overload.

[0017] Preferably, the edge trimming accuracy adjustment device further includes a position feedback device, which includes a position sensor and a signal processing module. The position sensor is installed on the adjusting screw, and the signal processing module is connected to the main control system. The position sensor monitors the position of the adjusting screw in real time and transmits the data to the signal processing module. The signal processing module adjusts the position of the adjusting screw according to the position data through the main control system to ensure edge trimming accuracy.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This utility model provides a novel circular blade device for cutting edges of plastic sheets, which aims to optimize cutting accuracy, reduce maintenance costs, and improve the stability and reliability of the equipment, thereby meeting the demand of the plastic processing industry for efficient and high-precision cutting equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0021] Figure 2 This is a schematic diagram of the cutter shaft drive device of this utility model;

[0022] Figure 3 This is a schematic diagram of the tool positioning device of this utility model;

[0023] Figure 4 This is a schematic diagram of the quick-change tool device of this utility model;

[0024] Figure 5 This is a schematic diagram of the edge trimming accuracy adjustment device of this utility model;

[0025] Figure 6 This is a schematic diagram of the overload protection device of this utility model.

[0026] The attached figures are labeled as follows:

[0027] 1. Frame; 2. Upper cutter shaft; 3. Lower cutter shaft; 4. Circular cutter; 5. Motor; 6. Reducer; 7. Drive pulley; 8. Driven pulley; 9. Transmission belt; 10. Positioning pin; 11. Positioning pin sleeve; 12. Positioning spring; 13. Quick-change fixture; 14. Cylinder; 15. Connecting rod; 16. Fixture positioning pin; 17. Adjusting screw; 18. Adjusting nut; 19. Adjusting spring; 20. Position sensor; 21. Torque limiter; 22. Torque sensor; 23. Signal processing module; 24. Double-edged circular cutter; 25. Main control system. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. When the number of elements is referred to as "multiple," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings:

[0032] Please see Figure 1 This utility model provides a circular blade device for edge trimming of plastic sheets, including a frame 1, an upper blade shaft 2, a lower blade shaft 3, circular blades 4, a blade shaft drive device, a blade positioning device, a blade quick-change device, and an edge trimming accuracy adjustment device. The frame 1 serves as the supporting structure for the entire device, ensuring stable installation of all components. The upper blade shaft 2 and the lower blade shaft 3 are mounted on the frame 1 via bearings and are arranged in parallel to ensure the stability and accuracy of the edge trimming process. Each upper blade shaft 2 and lower blade shaft 3 has two symmetrically arranged circular blades 24 mounted on its shaft end to accommodate the edge trimming requirements of plastic sheets of different thicknesses.

[0033] Please see Figure 2 The cutter shaft drive device includes a motor 5, a reducer 6, and a transmission mechanism. The motor 5 is mounted outside the frame 1 and connected to the transmission mechanism via the reducer 6. The transmission mechanism includes a drive pulley 7, a driven pulley 8, and a transmission belt 9. The drive pulley 7 is mounted on the output shaft of the motor 5, the driven pulley 8 is mounted on the upper cutter shaft 2 and the lower cutter shaft 3, and the transmission belt 9 connects the drive pulley 7 and the driven pulley 8. After the motor 5 starts, the drive pulley 7 drives the driven pulley 8 to rotate via the transmission belt 9, thereby driving the upper cutter shaft 2 and the lower cutter shaft 3 to rotate synchronously, realizing the cutting action of the circular cutter 24. The cutter shaft drive device also includes an overload protection device, which includes a torque limiter 21 and a torque sensor 22. The torque limiter 21 is installed between the reducer 6 and the transmission mechanism, and the torque sensor 22 is installed on the torque limiter 21. When an overload occurs during the drive of the cutter shaft 2 / 3, the torque sensor 22 detects the overload signal and sends it to the main control system 25. The main control system 25 controls the start and stop of the motor 5 to achieve overload protection, prevent the cutter shaft 2 / 3 from being damaged due to overload, and improve the reliability and service life of the equipment.

[0034] Please see Figure 3The tool positioning device includes a positioning pin 10, a positioning pin sleeve 11, and a positioning spring 12. The positioning pin 10 is fixed to the frame 1, the positioning pin sleeve 11 is installed on the shaft ends of the upper tool shaft 2 and the lower tool shaft 3, and the positioning spring 12 is installed between the positioning pin 10 and the positioning pin sleeve 11. When the circular cutter 24 is installed on the upper tool shaft 2 and the lower tool shaft 3, the positioning pin 10 is inserted into the positioning pin sleeve 11. The positioning pin sleeve 11, through the elastic action of the positioning spring 12, ensures the axial positioning accuracy of the circular cutter 24 during the cutting process, preventing the circular cutter 24 from undergoing axial displacement during high-speed rotation, which would affect the cutting accuracy.

[0035] Please see Figure 4 The quick-change tool device includes a quick-change fixture 13, a fixture drive mechanism, and a fixture positioning pin 16. The quick-change fixture 13 is mounted on the shaft ends of the upper tool shaft 2 and the lower tool shaft 3. The fixture drive mechanism includes a cylinder 14 and a connecting rod 15. The cylinder 14 is mounted on the frame 1 and connected to the quick-change fixture 13 via the connecting rod 15. The fixture positioning pin 16 is mounted on the quick-change fixture 13. When it is necessary to replace the circular tool 24, the cylinder 14 drives the quick-change fixture 13 to move via the connecting rod 15. The fixture positioning pin 16 retracts from the shaft ends of the upper tool shaft 2 and the lower tool shaft 3, and the quick-change fixture 13 releases the circular tool 24, completing the quick replacement of the circular tool 24. This simplifies the tool replacement process, reduces maintenance costs, and improves the flexibility of the equipment.

[0036] Please see Figure 5 The edge-cutting accuracy adjustment device includes an adjusting screw 17, an adjusting nut 18, and an adjusting spring 19. The adjusting screw 17 is mounted on the frame 1, the adjusting nut 18 is mounted on the blade holder of the circular blade 24, and the adjusting spring 19 is installed between the adjusting screw 17 and the adjusting nut 18. By rotating the adjusting screw 17, the position of the adjusting nut 18 is adjusted, thereby adjusting the edge-cutting position of the circular blade 24 to ensure edge-cutting accuracy. The edge-cutting accuracy adjustment device also includes a position feedback device, which includes a position sensor 20 and a signal processing module 23. The position sensor 20 is mounted on the adjusting screw 17, and the signal processing module 23 is connected to the main control system 25. The position sensor 20 monitors the position of the adjusting screw 17 in real time and transmits the data to the signal processing module 23. Based on the position data, the signal processing module 23 adjusts the position of the adjusting screw 17 through the main control system 25 to ensure edge-cutting accuracy and improve the consistency and stability of edge cutting.

[0037] Please see Figure 6The overload protection device includes a torque limiter 21 and a torque sensor 22. The torque limiter 21 is installed between the reducer 6 and the transmission mechanism, and the torque sensor 22 is installed on the torque limiter 21. When an overload occurs during the drive of the cutter shaft 2 / 3, the torque sensor 22 detects the overload signal and sends it to the main control system 25. The main control system 25 controls the start and stop of the motor 5 to achieve overload protection, preventing damage to the cutter shaft 2 / 3 due to overload and improving the reliability and service life of the equipment.

[0038] The working principle is as follows:

[0039] Cutter shaft drive device: Motor 5 drives the upper cutter shaft 2 and lower cutter shaft 3 to rotate through reducer 6 and transmission mechanism. After motor 5 starts, the driving pulley 7 drives the driven pulley 8 to rotate through transmission belt 9, thereby driving the upper cutter shaft 2 and lower cutter shaft 3 to rotate synchronously, realizing the cutting action of circular cutter 24. Torque sensor 22 monitors the torque change during transmission in real time. When the torque exceeds the preset threshold, torque sensor 22 sends a signal to main control system 25, and main control system 25 controls motor 5 to stop to prevent overload damage.

[0040] Tool positioning device: When the circular cutter 24 is installed on the upper tool shaft 2 and the lower tool shaft 3, the positioning pin 10 is inserted into the positioning pin sleeve 11. The positioning pin sleeve 11, through the elastic action of the positioning spring 12, ensures the axial positioning accuracy of the circular cutter 24 during the cutting process and prevents the circular cutter 24 from axial displacement during high-speed rotation, which would affect the cutting accuracy.

[0041] Quick-change tool device: When the circular cutter 24 needs to be replaced, the cylinder 14 drives the quick-change fixture 13 to move via the connecting rod 15. The fixture positioning pin 16 retracts from the shaft ends of the upper tool shaft 2 and the lower tool shaft 3, and the quick-change fixture 13 releases the circular cutter 24, completing the quick replacement of the circular cutter 24. This process simplifies the tool replacement steps, reduces maintenance costs, and improves the flexibility of equipment use.

[0042] Edge trimming accuracy adjustment device: By rotating the adjusting screw 17, the position of the adjusting nut 18 is adjusted, thereby adjusting the edge trimming position of the circular cutter 24 to ensure edge trimming accuracy. The position sensor 20 monitors the position of the adjusting screw 17 in real time and transmits the data to the signal processing module 23. Based on the position data, the signal processing module 23 adjusts the position of the adjusting screw 17 through the main control system 25 to ensure edge trimming accuracy and improve the consistency and stability of edge trimming.

[0043] Overload protection device: When an overload occurs during the drive of the cutter shaft, the torque sensor 22 detects the overload signal and sends it to the main control system 25. The main control system 25 controls the start and stop of the motor 5 to achieve overload protection, prevent the cutter shaft 2 / 3 from being damaged due to overload, and improve the reliability and service life of the equipment.

[0044] Specific application scenarios:

[0045] In a plastic products processing plant, the need arises to trim plastic sheets of varying thicknesses. Traditional trimming equipment suffers from low precision, high maintenance costs, and poor stability. To improve production efficiency and product quality, the plant introduced this novel plastic sheet trimming circular blade device. During operation, technicians can adjust the trimming position of the circular blade 24 by adjusting the adjusting screw 17, ensuring trimming accuracy for different thicknesses of plastic sheets. When a worn circular blade 24 needs replacement, technicians simply operate the cylinder 14, which, via the connecting rod 15, drives the quick-change clamp 13 to release the circular blade 24, facilitating rapid replacement. Furthermore, the overload protection device detects an overload signal and promptly shuts down the machine, preventing damage and ensuring production safety. The plant's technicians monitor the equipment's operating status in real-time via the main control system 25, ensuring the stability and precision of the trimming process, ultimately improving production efficiency and product quality.

[0046] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A circular blade device for cutting edges of plastic sheets, characterized in that: The device includes a frame on which an upper cutter shaft and a lower cutter shaft are arranged in parallel. Circular cutters are mounted on the upper and lower cutter shafts. A cutter shaft drive device is connected to the upper and lower cutter shafts. A cutter positioning device and a quick-change cutter device are installed at both ends of the upper and lower cutter shafts. A cutting edge precision adjustment device is connected to the circular cutter.

2. The plastic sheet edge-cutting circular knife device according to claim 1, characterized in that: The aforementioned cutter shaft drive device includes a motor, a reducer, and a transmission mechanism. The motor is mounted outside the machine frame and is connected to the transmission mechanism through the reducer. The transmission mechanism includes a driving pulley, a driven pulley, and a transmission belt. The driving pulley is mounted on the output shaft of the motor, the driven pulley is mounted on the upper and lower cutter shafts, and the transmission belt connects the driving pulley and the driven pulley.

3. The plastic sheet edge-cutting circular knife device according to claim 1, characterized in that: The tool positioning device includes a positioning pin, a positioning pin sleeve, and a positioning spring. The positioning pin is fixed on the machine frame, the positioning pin sleeve is installed on the shaft ends of the upper and lower tool shafts, and the positioning spring is installed between the positioning pin and the positioning pin sleeve. When the circular tool is installed on the upper and lower tool shafts, the positioning pin is inserted into the positioning pin sleeve.

4. The plastic sheet edge-cutting circular knife device according to claim 1, characterized in that: The aforementioned quick tool change device includes a quick-change fixture, a fixture drive mechanism, and a fixture positioning pin. The quick-change fixture is installed on the shaft ends of the upper and lower tool shafts. The fixture drive mechanism includes a cylinder and a connecting rod. The cylinder is installed on the frame and connected to the quick-change fixture via the connecting rod. The fixture positioning pin is installed on the quick-change fixture.

5. The plastic sheet edge-cutting circular knife device according to claim 1, characterized in that: The cutting edge precision adjustment device includes an adjusting screw, an adjusting nut, and an adjusting spring. The adjusting screw is mounted on the machine frame, the adjusting nut is mounted on the blade holder of the circular blade, and the adjusting spring is installed between the adjusting screw and the adjusting nut. By rotating the adjusting screw, the position of the adjusting nut is adjusted, thereby adjusting the cutting edge position of the circular blade.

6. The plastic sheet edge-cutting circular knife device according to claim 1, characterized in that: The circular cutter adopts a double-edged structure, with the two cutting edges of each circular cutter arranged symmetrically at a certain angle. Two horizontal circular cutters are installed at the ends of the upper and lower cutting shafts, and the distance between the cutting edges of the two circular cutters is adjustable.

7. The plastic sheet edge-cutting circular knife device according to claim 2, characterized in that: The aforementioned cutter shaft drive device also includes an overload protection device, which includes a torque limiter and a torque sensor. The torque limiter is installed between the reducer and the transmission mechanism, and the torque sensor is installed on the torque limiter. When an overload occurs during the cutter shaft drive process, the torque sensor detects the overload signal and sends it to the main control system. The main control system controls the start and stop of the motor to achieve overload protection.

8. The plastic sheet edge-cutting circular knife device according to claim 5, characterized in that: The edge trimming accuracy adjustment device also includes a position feedback device, which includes a position sensor and a signal processing module. The position sensor is mounted on the adjusting screw, and the signal processing module is connected to the main control system. The position sensor monitors the position of the adjusting screw in real time and transmits the data to the signal processing module. The signal processing module adjusts the position of the adjusting screw according to the position data through the main control system.

9. The plastic sheet edge-cutting circular knife device according to claim 1, characterized in that: The upper and lower cutter shafts are mounted on the frame via bearings, and the circular cutter is mounted on the upper and lower cutter shafts via a quick-change fixture. The transmission mechanism of the cutter shaft drive device is connected to the upper and lower cutter shafts via a driven pulley.

10. The plastic sheet edge-cutting circular knife device according to claim 5, characterized in that: The adjusting screw is connected to the adjusting nut via an adjusting spring. The adjusting nut is mounted on the tool holder of the circular cutter. The position sensor is mounted on the adjusting screw. The torque limiter is mounted between the reducer and the transmission mechanism. The torque sensor is mounted on the torque limiter. The position sensor and the torque sensor are connected to the main control system.

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