A device for testing the tensile strength of plastic film

Abstract

This utility model discloses a plastic film tensile strength testing device, belonging to the field of plastic film tensile strength testing, including a testing platform. This device uses a motor-driven ball screw rotation in conjunction with a sliding block to allow a clamping plate to move and stretch stably. A threaded rod drives a movable clamping plate to clamp the plastic film. A pressure sensor in the groove on the lower surface of the movable clamping plate monitors the clamping pressure in real time and transmits the data to a controller. This avoids film slippage and testing failure due to loose clamping, or premature film damage due to excessive clamping, significantly improving the accuracy of the clamping process before testing and laying the foundation for the reliability of subsequent tensile strength test data. It achieves uniform and stable stretching of the film, reducing the impact of stretching speed fluctuations on the test results compared to traditional manual or non-uniform stretching methods, thus improving the accuracy of the tensile strength test data.

Description

Technical Field

[0001] This utility model belongs to the field of plastic film tensile strength testing technology, and specifically relates to a plastic film tensile strength testing device. Background Technology

[0002] As is well known, plastic film for electronic products is used to protect the screens of electronic products. Therefore, plastic film for electronic products is widely used and requires tensile strength testing. As a result, a new type of tensile strength testing device for plastic film for electronic products is needed, which has been widely used in the field of electronic products.

[0003] Currently, some tensile strength testing devices on the market have uneven clamping force on the film in their fixtures, which can easily cause the film to break in non-test areas, affecting the accuracy of the test. The lack of real-time monitoring not only wastes samples but may also cause impact damage to the equipment, making it inconvenient to use and affecting the accuracy of tensile test results for plastic films. Utility Model Content

[0004] The purpose of this invention is to provide a plastic film tensile strength testing device to solve the problems mentioned in the background art. In some of the tensile strength testing devices on the market, the clamping force on the film is uneven, which can easily cause the film to break in non-test areas, affecting the accuracy of the test. The lack of real-time monitoring not only wastes the sample but may also cause impact damage to the equipment, making it inconvenient to use and affecting the accuracy of the tensile test results of the plastic film.

[0005] To achieve the above objectives, this utility model provides the following technical solution: including a testing station; A U-shaped bracket is installed on the upper surface of the testing table. A motor is installed on the left side of the bracket. A ball screw is rotatably installed inside the bracket. A slide is slidably installed on the ball screw through a ball screw nut bearing seat. The left end of the ball screw extends through the bracket and is fixedly connected to the output shaft of the motor. The first clamping plate and the second clamping plate are U-shaped. The first clamping plate is mounted on the lower surface of the slide via a drive assembly, and the second clamping plate is slidably mounted on the bracket via a sliding assembly. The first clamping plate and the second clamping plate are connected by two telescopic rods. Two threaded rods are threaded through and installed on the bottom ends of clamping plate one and clamping plate two, respectively. A movable clamping plate is rotatably installed on the top end of each threaded rod. A groove is formed on the lower surface of the movable clamping plate, and a pressure sensor is installed in the groove. The two pressure sensors are electrically connected to the controller.

[0006] The above scheme utilizes a motor-driven ball screw rotation in conjunction with a sliding block to allow the clamping plate to move and stretch stably. A threaded rod drives a movable clamping plate to tighten the plastic film. A pressure sensor within a groove on the lower surface of the movable clamping plate monitors the clamping pressure in real time and transmits the data to the controller. This prevents the film from slipping and failing due to excessively loose clamping, or from prematurely damaging the film due to excessively tight clamping. This significantly improves the accuracy of the clamping process before testing, laying the foundation for the reliability of subsequent tensile strength test data. It achieves uniform and stable stretching of the film, reducing the impact of stretching speed fluctuations on the test results compared to traditional manual or non-uniform stretching methods, thus improving the accuracy of the tensile strength test data.

[0007] In the above scheme, it should be noted that both the motor and the electric push rod are electrically connected to an external power source.

[0008] In a preferred embodiment, the drive assembly includes an electric push rod mounted on the lower surface of the slide block, a second clamping plate mounted on the end of the output shaft of the electric push rod, a sliding assembly including a wedge plate, a wedge groove formed on the right side of the inner wall of the bracket, the wedge plate being slidably mounted in the wedge groove, a first clamping plate mounted on the wedge plate, a fixed plate mounted on the output shaft of the electric push rod, two telescopic rods mounted on the fixed plate, and the telescopic shafts of the telescopic rods being fixedly connected to the wedge plate.

[0009] By adopting the above scheme, an electric push rod and a telescopic rod are set up. The electric push rod drives the clamping plate, and the telescopic rod is fixedly connected to the wedge plate. This makes it easy to adjust the clamping plate one and clamping plate two to the lowest position, which is convenient for the staff to fix the plastic film. During the stretching process, the synchronous and stable movement of the two can be maintained, avoiding uneven stress on the film caused by the displacement of a single clamping plate. This further ensures the standardization of the testing process and ensures that the test results can truly reflect the tensile strength performance of the film.

[0010] In a preferred embodiment, a U-shaped base plate is installed on the lower surface of the testing station, and a waste frame with an opening on the upper surface of the base plate is provided. A channel is opened on the upper surface of the testing station, and the waste frame is located directly below the channel.

[0011] By adopting the above solution, a waste collection box and a base plate are set up. The waste collection box is set up on the base plate under the testing table, and a channel is opened on the surface of the testing table. Plastic film waste generated during the testing process, such as broken fragments, can fall directly into the waste collection box through the channel, realizing the centralized collection of waste, avoiding waste from scattering on the testing table or the ground, reducing subsequent cleaning work, and maintaining the cleanliness of the testing environment.

[0012] In a preferred embodiment, the controller includes a control panel, which is mounted on the upper surface of the testing platform. The pressure sensor located on the left side is electrically connected to the control panel via a connecting wire one, and the pressure sensor located on the right side is electrically connected to the connecting wire one via a connecting wire two passing through the bracket. The motor is electrically connected to the control panel via a connecting wire three.

[0013] By adopting the above solution, the control panel is set up, and the connection between the control panel and the pressure sensor and motor is as follows: the left pressure sensor is directly connected to the control panel via connection cable one, and the right pressure sensor is connected to connection cable one through the bracket via connection cable two. This avoids the connection cables being exposed to the outside and susceptible to external interference or damage, ensuring stable transmission of pressure data and motor control signals, reducing detection errors or equipment failures caused by signal interruption or interference. The control panel is installed on the surface of the testing table, allowing operators to complete operations such as viewing pressure data and controlling motor start and stop from the same location without having to frequently move between different parts of the equipment, improving operational convenience. At the same time, it facilitates real-time monitoring of the testing process, enabling timely detection and handling of abnormalities.

[0014] In a preferred embodiment, an emergency stop button is installed on the left end of the front side of the bracket, and the emergency stop button is electrically connected to the motor via a connecting wire.

[0015] By adopting the above solution, an emergency stop button is installed on the left side of the front side of the bracket and electrically connected to the motor. In case of emergencies such as sudden membrane breakage, abnormal equipment operation (e.g., motor malfunction, clamping component failure), etc., during the testing process, the staff can quickly press the emergency stop button to immediately cut off the motor power, stop the equipment from running, avoid further damage to the equipment, and prevent injury to the staff from the broken membrane or malfunctioning parts, thus greatly improving the safety of equipment use.

[0016] In a preferred embodiment, two slide rods are installed inside the bracket, and a slide plate is installed on the upper surface of the slide block, the slide plate sliding through the two slide rods.

[0017] By adopting the above scheme, a sliding plate and a sliding rod are set up. The sliding rod guides and limits the movement of the sliding plate and the sliding block, preventing the sliding block from shifting left and right, shaking or jamming during the movement of the sliding block along the ball screw. This ensures that the sliding block drives the clamping component to move smoothly, thereby ensuring the uniformity and stability of the plastic film stretching process and improving the accuracy of the test data.

[0018] In a preferred embodiment, two limiting grooves are provided on opposite sides of the vertical portions of clamping plate one and clamping plate two. A limiting plate is slidably installed in the limiting groove, and one end of the limiting plate is fixedly connected to the movable clamping plate on the same side.

[0019] By adopting the above solution, the limiting plate and the limiting groove can enhance the connection stability between the movable clamping plate and the clamping plate, prevent the movable clamping plate from deforming due to force during clamping or stretching, extend the service life of the clamping components, and reduce the probability of equipment failure.

[0020] In a preferred embodiment, rubber pads are installed on the inner top surfaces of clamping plate one and clamping plate two, as well as the upper surface of the movable clamping plate, and anti-slip pads are installed at the bottom ends of the support legs at the four corners of the lower surface of the testing table.

[0021] By adopting the above scheme and setting rubber pads and anti-slip pads, the rubber pads can increase the friction between the rubber pads and the plastic film, improve the clamping firmness, and prevent the film from slipping during the stretching process. At the same time, the soft texture of the rubber pads can prevent the hard surface of the clamping components from scratching or indenting the film, and prevent the test results from being affected by premature film damage. It is especially suitable for testing plastic films with sensitive surfaces or thin thickness. Combined with the function of the anti-slip pads, the stability and firmness of the device are improved.

[0022] Compared with the prior art, the beneficial effects of this utility model are: This plastic film tensile strength testing device uses a motor-driven ball screw to rotate in conjunction with a slide block, allowing the clamping plate to move and stretch stably. A threaded rod drives a movable clamping plate to clamp the plastic film. A pressure sensor in the groove on the lower surface of the movable clamping plate monitors the clamping pressure in real time and transmits the data to the controller. This prevents the film from slipping and failing due to loose clamping, or from prematurely damaging the film due to excessive clamping, significantly improving the accuracy of the clamping process before testing. This lays the foundation for the reliability of subsequent tensile strength test data and achieves uniform and stable stretching of the film. Compared to traditional manual or non-uniform stretching methods, it reduces the impact of stretching speed fluctuations on the test results and improves the accuracy of the tensile strength test data. This plastic film tensile strength testing device is equipped with an electric push rod and a telescopic rod. The electric push rod is driven by the telescopic rod, which is fixedly connected to the wedge plate. This allows the clamping plate 1 and clamping plate 2 to be easily adjusted to their lowest positions, making it convenient for workers to fix the plastic film. During the stretching process, the synchronous and stable movement of the two clamping plates can be maintained, avoiding uneven stress on the film caused by the displacement of a single clamping plate. This further ensures the standardization of the testing process and ensures that the test results can accurately reflect the tensile strength performance of the film. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the main cross-sectional structure of the clamping plate of this utility model; Figure 3This is a schematic diagram of the main structure of the ball screw of this utility model.

[0024] In the diagram: 1. Testing table; 2. Support frame; 3. Ball screw; 4. Slide; 5. Motor; 6. Clamping plate one; 7. Threaded rod; 8. Movable clamping plate; 9. Pressure sensor; 10. Control panel; 11. Electric push rod; 12. Fixing plate; 13. Telescopic rod; 14. Wedge plate; 15. Limiting plate; 16. Rubber pad; 17. Slide plate; 18. Slide rod; 19. Base plate; 20. Scrap box; 21. Emergency stop button; 22. Anti-slip pad; 23. Clamping plate two. Detailed Implementation

[0025] Please see Figure 1-3 This utility model provides a device for testing the tensile strength of plastic film, including a testing platform 1; The U-shaped bracket 2 is installed on the upper surface of the testing table 1. The motor 5 is installed on the left side of the bracket 2. The ball screw 3 is rotatably installed inside the bracket 2. The slide 4 is slidably installed on the ball screw 3 through the ball screw nut bearing seat. The left end of the ball screw 3 extends through the bracket 2 and is fixedly connected to the output shaft of the motor 5. The U-shaped clamping plate 6 and clamping plate 23 are mounted on the lower surface of the slide block 4 via a drive assembly, and the clamping plate 23 is slidably mounted on the bracket 2 via a sliding assembly. The clamping plate 6 and clamping plate 23 are connected by two telescopic rods 13. Two threaded rods 7 are threaded through and installed on the bottom ends of clamping plate 6 and clamping plate 23, respectively. A movable clamping plate 8 is rotatably mounted on the top of the threaded rods 7. A groove is formed on the lower surface of the movable clamping plate 8, and a pressure sensor 9 is installed in the groove. The two pressure sensors 9 are electrically connected to the controller. The ball screw 3 is driven by the motor 5 to rotate, which, in conjunction with the action of the slide 4, allows clamping plate 6 to move and stretch stably. The movable clamping plate 8 is driven by the threaded rods 7 to clamp the plastic film. With the help of the pressure sensor 9 in the groove on the lower surface of the movable clamping plate 8, the clamping pressure can be monitored in real time and the data can be transmitted to the controller. This avoids the film slipping and failure due to loose clamping, or premature damage to the film due to excessive clamping. It greatly improves the accuracy of the clamping process before testing, lays the foundation for the reliability of subsequent tensile strength test data, and achieves uniform and stable stretching of the film. Compared with traditional manual or non-uniform stretching methods, it can reduce the impact of stretching speed fluctuations on the test results and improve the accuracy of tensile strength test data.

[0026] The drive assembly includes an electric push rod 11, which is used to fix the clamping plate 23. The electric push rod 11 is mounted on the lower surface of the slide block 4, and the clamping plate 23 is mounted on the end of the output shaft of the electric push rod 11. The sliding assembly includes a wedge plate 14, which is used to slide and support the clamping plate 6. A wedge groove is provided on the right side of the inner wall of the bracket 2, which allows the wedge plate 14 to slide. The wedge plate 14 is slidably mounted in the wedge groove, and the clamping plate 6 is mounted on the wedge plate 14. A fixing plate 12 is mounted on the output shaft of the electric push rod 11, which is used to fix and support the telescopic rod 13. Two telescopic rods 13 are installed on the fixed plate 12. The telescopic shaft of the telescopic rod 13 is fixedly connected to the wedge plate 14. By setting up an electric push rod 11 and a telescopic rod 13, the electric push rod 11 drives the telescopic rod 13 and the wedge plate 14 are fixedly connected, which makes it easy to adjust the clamping plate 1 6 and the clamping plate 23 to the lowest position. This makes it easier for the staff to fix the plastic film. During the stretching process, the synchronicity and stability of the movement of the two can be maintained, avoiding uneven force on the film caused by the displacement of a single clamping plate. This further ensures the standardization of the testing process and ensures that the test results can truly reflect the tensile strength performance of the film.

[0027] A U-shaped base plate 19 is installed on the lower surface of the testing station 1, which supports the waste frame 20. The upper surface of the base plate 19 is provided with a waste frame 20 with an opening on the upper surface. The waste frame 20 collects the film that fails the test or is accidentally broken during the test. A channel is opened on the upper surface of the testing station 1, and the waste frame 20 is located directly below the channel. By setting up the waste frame 20 and the base plate 19, the waste frame 20 is set on the base plate 19 below the testing station 1, and the channel is opened on the surface of the testing station 1. Plastic film waste generated during the test, such as broken fragments, can fall directly into the waste frame 20 through the channel, realizing the centralized collection of waste and preventing waste from scattering on the testing station 1 or the ground, reducing subsequent cleaning work and maintaining the cleanliness of the testing environment.

[0028] The controller includes a control panel 10, which is installed on the upper surface of the testing platform 1. A pressure sensor 9 on the left side is electrically connected to the control panel 10 via a connecting cable 1. A pressure sensor 9 on the right side is electrically connected to the connecting cable 1 via a connecting cable 2 that passes through the bracket 2. The motor 5 is electrically connected to the control panel 10 via a connecting cable 3. By configuring the control panel 10 and the connection methods between the control panel 10, the pressure sensors, and the motor 5, the left-side pressure sensor is directly connected to the control panel 10 via connecting cable 1, and the right-side pressure sensor is connected to the connecting cable 1 via connecting cable 2 that passes through the bracket 2. This avoids the connecting cables being exposed to external interference or damage, ensuring stable transmission of pressure data and motor 5 control signals, and reducing detection errors or equipment malfunctions caused by signal interruption or interference. Installing the control panel 10 on the surface of the testing platform 1 allows operators to view pressure data and control the start / stop of the motor 5 from the same location, eliminating the need for frequent movement between different parts of the equipment, improving operational convenience, and facilitating real-time monitoring of the testing process to promptly detect and handle abnormalities.

[0029] An emergency stop button 21 is installed on the left side of the front side of the bracket 2. The emergency stop button 21 is used to interrupt the motor 5. The emergency stop button 21 is electrically connected to the motor 5 through the connecting wire 4. By setting the emergency stop button 21 and installing it on the left side of the front side of the bracket 2 and electrically connecting it to the motor 5, when an emergency occurs during the testing process, such as the sudden breakage of the membrane, abnormal operation of the equipment (e.g., motor 5 running out of control, or clamping component failure), the operator can quickly press the emergency stop button 21 to immediately cut off the power to the motor 5, stop the equipment from running, avoid further damage to the equipment, and prevent injury to the operator from the broken membrane or out-of-control parts, thus greatly improving the safety of the equipment.

[0030] Two slide rods 18 are installed inside the bracket 2. The slide rods 18 are used to slide and support the slide plate 17. The slide plate 17 is installed on the upper surface of the slide block 4. The slide plate 17 is used to limit and support the slide block 4. The slide plate 17 slides through the two slide rods 18. By setting the slide plate 17 and slide rods 18, the slide rods 18 play a guiding and limiting role in the movement of the slide plate 17 and the slide block 4, avoiding the slide block 4 from shifting left and right, shaking or jamming during the movement along the ball screw 3. This ensures that the slide block 4 drives the clamping component to move smoothly, thereby ensuring the uniformity and stability of the plastic film stretching process and improving the accuracy of the test data.

[0031] Two limiting grooves are provided on the opposite sides of the vertical portions of clamping plate 16 and clamping plate 23. The limiting grooves accommodate the limiting plate 15, which is slidably installed in the limiting groove. One end of the limiting plate 15 is fixedly connected to the movable clamping plate 8 on the same side. By setting the limiting plate 15, the cooperation between the limiting plate 15 and the limiting groove can enhance the connection stability between the movable clamping plate 8 and the clamping plate, prevent the movable clamping plate 8 from deforming due to force during clamping or stretching, extend the service life of the clamping components, and reduce the probability of equipment failure.

[0032] Rubber pads 16 are installed on the inner top surfaces of clamping plate 1 6 and clamping plate 23, as well as the upper surface of movable clamping plate 8. Anti-slip pads 22 are installed at the bottom ends of the support legs at the four corners of the lower surface of the test table 1. By setting rubber pads 16 and anti-slip pads 22, rubber pads 16 can increase the friction between the rubber pad and the plastic film, improve the clamping firmness, and prevent the film from slipping during stretching. At the same time, the rubber pads 16 are soft and can prevent the hard surface of the clamping components from scratching or indenting the film, preventing the test results from being affected by premature film damage. They are especially suitable for testing plastic films with sensitive surfaces or thin thickness. Combined with the function of anti-slip pads 22, the stability and firmness of the device are improved.

[0033] During use, after connecting the power supply to the equipment, the operator starts the equipment through the control panel 10 on the surface of the testing platform 1. The system automatically detects the power-on status and signal connection of core components such as motor 5, pressure sensor 9, and electric push rod 11. At the same time, the operator observes whether the emergency stop button 21 is in the reset state and whether the anti-slip pad 22 is firmly attached to the ground to prevent the equipment from shifting during operation. Then, the electric push rod 11 is activated, which drives the clamping plate 23 to move downward. The clamping plate 6 moves downward with the clamping plate 23 under the action of the fixed plate 12, telescopic rod 13, and wedge plate 14. Then, the electric push rod 11 is turned off, and the two ends of the plastic film are placed in the clamping plate 6 and the clamping plate 23 respectively. Then, the threaded rod 7 is rotated, which drives the movable clamping plate 8 to move downward. The plastic film is clamped by moving upwards. At this time, the pressure sensor 9 senses the pressure of the movable clamping plate 8 on the plastic film. The pressure data is viewed through the control panel 10, and it is then determined whether to continue applying pressure. After the film is fixed, the electric push rod 11 is activated again to reset the clamping plate 6 and clamping plate 23. The plastic film then moves upwards, and the motor 5 is activated. The motor 5 drives the ball screw 3 to rotate, which in turn drives the slide 4 to move. The movement of the slide 4 drives the clamping plate 23 to move through the electric push rod 11. At this time, a tensile test is performed on the plastic film. During the tensile test, the pressure sensor 9 continuously monitors the force at both ends of the film and transmits the real-time force data to the control panel 10. At the same time, the control panel 10 can record parameters such as the motor speed and tensile time.

Claims

1. A device for testing the tensile strength of plastic film, characterized in that: Including the testing station (1); A U-shaped bracket (2) is installed on the upper surface of the testing table (1). A motor (5) is installed on the left side of the bracket (2). A ball screw (3) is rotatably installed inside the bracket (2). A slide (4) is slidably installed on the ball screw (3) through a ball screw nut bearing seat. The left end of the ball screw (3) extends through the bracket (2) and is fixedly connected to the output shaft of the motor (5); The first clamping plate (6) and the second clamping plate (23) are U-shaped. The first clamping plate (6) is mounted on the lower surface of the slide (4) by a drive assembly. The second clamping plate (23) is slidably mounted on the bracket (2) by a sliding assembly. The first clamping plate (6) and the second clamping plate (23) are connected by two telescopic rods (13). Two threaded rods (7) are threaded through and installed on the bottom ends of clamping plate one (6) and clamping plate two (23), respectively. A movable clamping plate (8) is rotatably installed on the top end of the threaded rod (7). A groove is provided on the lower surface of the movable clamping plate (8). A pressure sensor (9) is installed in the groove. The two pressure sensors (9) are electrically connected to the controller.

2. The plastic film tensile strength testing device according to claim 1, characterized in that: The drive assembly includes an electric push rod (11), which is mounted on the lower surface of the slide (4). The clamping plate (23) is mounted on the end of the output shaft of the electric push rod (11). The sliding assembly includes a wedge plate (14). A wedge groove is provided on the right side of the inner wall of the bracket (2). The wedge plate (14) is slidably mounted in the wedge groove. The clamping plate (6) is mounted on the wedge plate (14). A fixing plate (12) is mounted on the output shaft of the electric push rod (11). Two telescopic rods (13) are mounted on the fixing plate (12). The telescopic shaft of the telescopic rod (13) is fixedly connected to the wedge plate (14).

3. The plastic film tensile strength testing device according to claim 1, characterized in that: The lower surface of the testing station (1) is equipped with a U-shaped base plate (19), and the upper surface of the base plate (19) is provided with a waste frame (20) with an opening on the upper surface. The upper surface of the testing station (1) is provided with a channel, and the waste frame (20) is located directly below the channel.

4. The plastic film tensile strength testing device according to claim 1, characterized in that: The controller includes a control panel (10), which is installed on the upper surface of the testing platform (1). The pressure sensor (9) located on the left side is electrically connected to the control panel (10) via a connecting line one. The pressure sensor (9) located on the right side is electrically connected to the connecting line one via a connecting line two passing through the bracket (2). The motor (5) is electrically connected to the control panel (10) via a connecting line three.

5. The plastic film tensile strength testing device according to claim 1, characterized in that: An emergency stop button (21) is installed on the left side of the front side of the bracket (2). The emergency stop button (21) is electrically connected to the motor (5) through a connecting wire.

6. The plastic film tensile strength testing device according to claim 1, characterized in that: Two slide rods (18) are installed inside the bracket (2), and a slide plate (17) is installed on the upper surface of the slide block (4). The slide plate (17) slides through the two slide rods (18).

7. The plastic film tensile strength testing device according to claim 1, characterized in that: Two limiting grooves are provided on opposite sides of the vertical portions of clamping plate one (6) and clamping plate two (23). A limiting plate (15) is slidably installed in the limiting groove, and one end of the limiting plate (15) is fixedly connected to the movable clamping plate (8) on the same side.

8. The plastic film tensile strength testing device according to claim 1, characterized in that: Rubber pads (16) are installed on the inner top surface of clamping plate one (6) and clamping plate two (23) and the upper surface of movable clamping plate (8). Anti-slip pads (22) are installed at the bottom of the support legs at the four corners of the lower surface of the testing table (1).

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