Durability detection device for plastic film

Abstract

A plastic film durability detection device disclosed by the present invention comprises a base, a supporting table is arranged at the position, close to the center, of the upper end of the base, a first motor is fixedly mounted on one side in the base, a stud is arranged on one side of the first motor, and a nut block is in threaded connection with the position, close to the center, of the surface of the stud. Supporting plates are fixedly connected to the two sides of the top of the nut block. According to the durability detection device for the plastic film, through the design of the outer shell, the inner shell, the rotating cylinder, a third motor, a first spring, a cam, a guide groove, a pulley, a fourth motor, a friction block, a friction layer, a second spring and a vibrator, different methods are adopted for simulation detection during durability detection of the plastic film; according to the first detection method, the wear condition of the film under continuous friction is simulated through continuous rotation of the rotating cylinder, and the method is suitable for evaluating the basic wear resistance of the film.

Description

Technical Field

[0001] The invention relates to the technical field of plastic film durability detection, in particular to a plastic film durability detection device. Background Art

[0002] During the production process, plastic films need to be tested by durability testing devices, mainly to ensure that they can meet the expected performance requirements in actual applications. These films are usually used in packaging, fixed protection, agriculture and other fields, and need to withstand various external forces and environmental factors. Therefore, their strength, especially wear resistance, is an important indicator for evaluating their quality and service life. The durability testing device can perform a variety of performance tests on plastic films, including tensile strength, elongation at break, tear strength, impact strength and wear resistance. Among them, the test of wear resistance is particularly important, because the film is often affected by external forces such as friction and scratches during use. If its wear resistance is insufficient, it will easily lead to damage, cracking and other problems, thereby affecting the packaging effect or protective performance.

[0003] The plastic film durability testing devices commonly used in the current market have obvious limitations in testing the wear resistance of plastic films. The main problem is that the testing method is generally relatively single, and the wear resistance of the film is often evaluated only through simple friction or scratch tests. However, this single testing method cannot fully reflect the various complex scenarios that the film may face in actual applications. These different application scenarios have different requirements for the wear resistance of the film, but the existing testing devices are often unable to accurately simulate these complex scenarios, thereby reducing the testing efficiency and failing to meet market demand. Therefore, we propose a durability testing device for plastic films. Summary of the invention

[0004] The purpose of the present invention is to provide a durability detection device for plastic film, so as to solve the problem that the durability detection device for plastic film currently commonly used in the market proposed in the above background technology has obvious limitations in the detection of the wear resistance of plastic film. The main problem is that the detection method is generally relatively single, and the wear resistance of the film is often evaluated only through simple friction or scratch tests. However, this single detection method cannot fully reflect the various complex scenarios that the film may face in actual applications. These different application scenarios have different requirements on the wear resistance of the film, but the existing detection devices are often unable to accurately simulate these complex scenarios, thereby reducing the detection efficiency and failing to meet market demand.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a durability detection device for a plastic film, comprising a base, a support platform is arranged at a center position on the upper end of the base, a first motor is fixedly installed on one side of the base, a stud is arranged on one side of the first motor, a nut block is threadedly connected to the center position of the surface of the stud, and support plates are fixedly connected to both sides of the top of the nut block, an outer shell is arranged at the upper end of the support platform, a second motor is fixedly installed at the center of the bottom of the support platform, an inner shell is arranged at the top position in the outer shell, a rotating cylinder is arranged on one side in the inner shell, a rotating rod is fixedly connected to the center of the top and bottom of the rotating cylinder, a third motor is fixedly installed on the top of one side in the inner shell, first springs are fixedly connected to the four corners of the top of the inner shell, the tops of the four first springs are fixedly connected to the inner top of the outer shell, and a A cam, a guide groove is provided on the outer wall of the cam, a pulley is fixedly installed at the center of the bottom of the inner shell body, the bottom of the pulley penetrates into the interior of the guide groove and contacts the inner wall of the guide groove, a fourth motor is fixedly installed at a center position of the bottom of the front surface of the outer shell body, a connecting frame is fixedly connected to one side of the outer wall of the outer shell body, a friction block is provided on one side of the connecting frame, a friction layer is bonded to one side of the friction block and the outer wall of the rotating cylinder by an adhesive, an installation groove is provided at the center of one side of the friction block, a vibrator is fixedly installed inside the installation groove, the front end and rear end of the top and bottom of the friction block are fixedly connected to the four corners of one side with a second spring, one end of the eight second springs are fixedly connected to the outer wall of the connecting frame, a vertical plate is fixedly installed on the other side of the top of the base, a detection plate is fixedly installed at the top position of one side of the vertical plate, and a bracket is fixedly connected to the upper and lower ends of one side of the detection plate respectively.

[0006] Preferably, the first motor is fixedly connected to the first output shaft through the output end on one side thereof, one side of the first output shaft is fixedly connected to one end of a stud, the other end of the stud is movably connected to a bearing fixedly installed in the center of the other side of the base, the center of the bottom of the nut block is fixedly connected to the first slider, the inner bottom of the base is provided with a first slide groove, the lower end of the first slider extends to the inside of the first slide groove and is slidably connected to the inner wall of the first slide groove, a transverse groove is provided on one side of the top of the base, the upper ends of the two support plates penetrate to the outside of the transverse groove and are fixedly connected to both sides of the bottom of the support platform.

[0007] Preferably, the second motor is fixedly connected to a second output shaft through the output end at the top thereof, the upper end of the second output shaft passes through the outside of the support platform and is fixedly connected to the center of the bottom of the outer shell, an annular rolling groove is provided on the top of the support platform, and steel balls are rollingly installed on the bottom of the outer shell, the number of steel balls is several, the number of annular rolling grooves is three, and the bottoms of the several steel balls respectively pass through the interior of the three annular rolling grooves and contact the inner walls of the annular rolling grooves.

[0008] Preferably, a second slider is fixedly connected to the top and bottom positions of one side of the inner shell body, and a second slide groove is opened on the inner wall of the outer shell body corresponding to one side of the two second sliders, and one side of the two second sliders extends to the interior of the two second slide grooves and is slidably connected to the inner wall of the second slide groove.

[0009] Preferably, the top and bottom of the two rotating rods are movably connected to bearings fixedly installed on one side of the top and bottom of the inner shell body respectively, and one side of the rotating cylinder passes through the outside of the inner shell body and the outer shell body in sequence. The third motor is fixedly connected to the third output shaft through the output end at its top, and the surface of the rotating rod arranged at the upper end and the top of the third output shaft are fixedly installed with transmission wheels, and the two transmission wheels are connected through belt drive. The fourth motor is fixedly connected to the fourth output shaft through the output end of its rear surface, and the rear end of the fourth output shaft passes through the interior of the outer shell and is fixedly connected to the top position of the center of the front surface of the cam.

[0010] Preferably, a limiting bolt is threadedly connected to the center of one side of the outer shell, a limiting groove is provided at the center of one side of the inner shell, and one end of the limiting bolt penetrates into the interior of the outer shell and is clamped with the inner wall of the limiting groove.

[0011] Preferably, one side of the two brackets is threadedly connected with a fixing bolt, and one end of the fixing bolt passes through the outside of the bracket and is fixedly connected with a clamping block.

[0012] A method for operating a durability testing device for a plastic film comprises the following steps:

[0013] Step one: the device is equipped with three detection methods. First, the first detection method is performed. The plastic film sample to be tested is placed on the detection plate. Then, the fixing bolts are adjusted so that the clamping block fixes the film on the detection plate. After the fixation is completed, the first motor is controlled to drive the stud to rotate. At this time, the nut block drives the top component of the stud through the support plate to approach the side of the detection plate as the stud rotates, until the rotating cylinder is attached to the surface of the film, and the friction layer of the outer wall of the rotating cylinder contacts the film. Next, the detection is performed, and the second motor is turned on to rotate. The rotating cylinder is rotated through the transmission between the two transmission wheels and the belt. The friction layer rotates on the film to perform wear resistance detection on the film. After the detection is completed, the first motor is turned off and the first motor is controlled to move the rotating cylinder to the right for a certain distance. Then the inspector evaluates the durability of the film by observing the degree of wear of the film.

[0014] Step two, then proceed to the second detection method. After removing the film, repeat the above fixing steps to re-fix the new film on the detection plate, and then start the second motor again to make the friction layer on the rotating cylinder contact with the film, and then adjust the limit bolt to disengage it from the limit groove, and then start the fourth motor to rotate the cam. During the rotation of the cam, the inner shell body is pushed up and down, and the pulley at the bottom of the inner shell body slides inside the guide groove on the cam as the cam rotates, ensuring smooth up and down movement of the inner shell body. Due to the presence of the first spring, the pulley will always roll inside the guide groove as the cam rotates. As the cam rotates, the friction layer on the rotating cylinder rubs up and down on the surface of the film. After the operation is completed, the rotating cylinder is controlled to move to the right again to a certain distance, and then the degree of wear on the surface of the film is observed to evaluate the film.

[0015] Step three, finally carry out the third detection method, repeat the above steps to fix the film on the detection plate, control the second motor to drive the outer shell to rotate, rotate the friction block to one side of the film, and then control the first motor again to move the friction block to the side of the film, so that the friction layer on the friction block contacts the film, and then start the vibrator to run, the friction block is connected to the second spring, and the vibrator is used to make the friction block vibrate. At this time, the friction layer rubs against the film through vibration. After the operation is completed, control the first motor to make the friction block leave the film, and finally observe the degree of wear of the film.

[0016] Step 4: Use the above three detection methods to simulate different types of friction on the film to detect and evaluate it.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The durability testing device for plastic film adopts different methods for simulation testing of the durability of plastic film through the design of the outer shell, inner shell, rotating cylinder, third motor, first spring, cam, guide groove, pulley, fourth motor, friction block, friction layer, second spring and vibrator. The first testing method simulates the wear of the film under continuous friction by the continuous rotation of the rotating cylinder, which is suitable for evaluating the basic wear resistance of the film. The second testing method drives the inner shell and the rotating cylinder to move up and down by the rotation of the cam, simulating the friction performance of the film when it is subjected to dynamic pressure changes, which helps to reveal the durability of the film in a complex stress environment. The third testing method uses a vibrator to drive the friction block to vibrate, thereby simulating the friction and wear of the film in a vibration environment, which is of great significance for evaluating the durability of the film in vibrating equipment or during transportation. These multiple testing methods can more comprehensively and accurately evaluate the durability of the film in different application scenarios, and provide strong technical support for the quality control of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 A is a partial enlarged schematic diagram;

[0021] Figure 3 For the present invention Figure 1 A partial enlarged schematic diagram of B in the middle;

[0022] Figure 4 This is a front view of the structure of the present invention;

[0023] Figure 5 It is a top view of the structure of the rotating drum of the present invention;

[0024] Figure 6 It is a structural stereogram of the nut block and the support platform of the present invention;

[0025] Figure 7 It is the left view of the structure of the friction block of the present invention.

[0026] In the figure: 1, base; 2, support platform; 3, first motor; 4, stud; 5, nut block; 6, first slide groove; 7, first slider; 8, support plate; 9, second motor; 10, outer shell; 11, steel ball; 12, inner shell; 13, second slide groove; 14, second slider; 15, rotating cylinder; 16, third motor; 17, transmission wheel; 18, belt; 19, first spring; 20, cam; 21, guide groove; 22, pulley; 23, rotating rod; 24, fourth motor; 25, connecting frame; 26, friction block; 27, friction layer; 28, second spring; 29, vibrator; 30, limit bolt; 31, limit groove; 32, vertical plate; 33, detection plate; 34, bracket; 35, fixing bolt. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-7The present invention provides a technical solution: a durability detection device for a plastic film, comprising a base 1, a support platform 2 is arranged at a center position on the upper end of the base 1, a first motor 3 is fixedly installed on one side of the base 1, a stud 4 is arranged on one side of the first motor 3, a nut block 5 is threadedly connected to the center position of the surface of the stud 4, and support plates 8 are fixedly connected to both sides of the top of the nut block 5, an outer shell 10 is arranged on the upper end of the support platform 2, a second motor 9 is fixedly installed at the center of the bottom of the support platform 2, an inner shell 12 is arranged at a top position in the outer shell 10, a rotating cylinder 15 is arranged on one side in the inner shell 12, a rotating rod 23 is fixedly connected to the center of the top and bottom of the rotating cylinder 15, a third motor 16 is fixedly installed on the top of one side in the inner shell 12, first springs 19 are fixedly connected to the four corners of the top of the inner shell 12, the tops of the four first springs 19 are fixedly connected to the inner top of the outer shell 10, a cam 20 is arranged at the center of the inner bottom of the outer shell 10, and the outer wall of the cam 20 is opened A guide groove 21 is provided, a pulley 22 is fixedly installed at the center of the bottom of the inner shell 12, the bottom of the pulley 22 penetrates into the inside of the guide groove 21 and contacts the inner wall of the guide groove 21, a fourth motor 24 is fixedly installed at the center position of the bottom of the front surface of the outer shell 10, a connecting frame 25 is fixedly connected to one side of the outer wall of the outer shell 10, a friction block 26 is arranged on one side of the connecting frame 25, one side of the friction block 26 and the outer wall of the rotating cylinder 15 are bonded with a friction layer 27 by an adhesive, a mounting groove is opened at the center of one side of the friction block 26, a vibrator 29 is fixedly installed inside the mounting groove, the front end and rear end of the top and bottom of the friction block 26 and the four corners of one side are fixedly connected with second springs 28, one end of the eight second springs 28 are fixedly connected to the outer wall of the connecting frame 25, a vertical plate 32 is fixedly installed on the other side of the top of the base 1, a detection plate 33 is fixedly installed at the top position of one side of the vertical plate 32, and a bracket 34 is fixedly connected to the upper end and the lower end of the detection plate 33 on one side of the vertical plate 32 respectively.

[0029] The first motor 3 is fixedly connected to the first output shaft through the output end on one side thereof, one side of the first output shaft is fixedly connected to one end of the stud 4, and the other end of the stud 4 is movably connected to the bearing fixedly installed in the center of the other side of the base 1. Starting the first motor 3 drives the stud 4 to rotate stably, and the first slider 7 is fixedly connected to the center of the bottom of the nut block 5. The inner bottom of the base 1 is provided with a first slide groove 6. The lower end of the first slide groove 7 extends to the inside of the first slide groove 6 and is slidably connected to the inner wall of the first slide groove 6, thereby ensuring the stability of the nut block 5 during horizontal movement. A transverse groove is provided on one side of the top of the base 1, and the upper ends of the two support plates 8 are both extended to the outside of the transverse groove and are fixedly connected to the two sides of the bottom of the support platform 2. The nut block 5 can drive the two support plates 8 to move along the transverse groove.

[0030] The second motor 9 is fixedly connected to the second output shaft through the output end at the top thereof, and the upper end of the second output shaft passes through the outside of the support platform 2 and is fixedly connected to the center of the bottom of the outer shell 10. An annular rolling groove is provided on the top of the support platform 2, and steel balls 11 are rollingly installed on the bottom of the outer shell 10. The number of steel balls 11 is several, and the number of annular rolling grooves is three. The bottoms of several steel balls 11 respectively pass through the interior of the three annular rolling grooves and contact with the inner walls of the annular rolling grooves, so that the second motor 9 is controlled to drive the outer shell 10 to rotate. The outer shell 10 can ensure its stability during rotation through the support of the steel balls 11.

[0031] A second slider 14 is fixedly connected to the top and bottom positions of one side of the inner shell 12, and a second slide groove 13 is opened on the inner wall of the outer shell 10 corresponding to one side of the two second sliders 14. One side of the two second sliders 14 extends to the inside of the two second slide grooves 13 and is slidably connected to the inner wall of the second slide groove 13, thereby ensuring the stability of the inner shell 12 when it reciprocates up and down.

[0032] The top and bottom of the two rotating rods 23 are movably connected to the bearings fixedly installed on one side of the top and bottom of the inner shell 12 respectively. One side of the rotating cylinder 15 passes through the outside of the inner shell 12 and the outer shell 10 in sequence. The third motor 16 is fixedly connected with the third output shaft through the output end at its top. The surface of the rotating rod 23 arranged at the upper end and the top of the third output shaft are fixedly installed with a transmission wheel 17. The two transmission wheels 17 are connected by a belt 18. When the third motor 16 is started, the two transmission wheels 17 are connected by the belt 18 to enable the rotating rod 23 to drive the rotating cylinder 15 to rotate. The fourth motor 24 is fixedly connected with the fourth output shaft through the output end of its rear surface. The rear end of the fourth output shaft passes through the interior of the outer shell 10 and is fixedly connected to the top position of the center of the front surface of the cam 20. The cam 20 can be driven to rotate by starting the fourth motor 24.

[0033] A limiting bolt 30 is threadedly connected to a center position on one side of the outer shell 10, and a limiting groove 31 is provided on a center position on one side of the inner shell 12. One end of the limiting bolt 30 passes through the interior of the outer shell 10 and is clamped with the inner wall of the limiting groove 31. By clamping the limiting bolt 30 with the limiting groove 31, it can be ensured that the rotating cylinder 15 will not shake up and down during the rotational friction detection.

[0034] One side of the two brackets 34 is threadedly connected with a fixing bolt 35 , one end of the fixing bolt 35 passes through the outside of the bracket 34 and is fixedly connected with a clamping block. The film to be tested can be fixed by adjusting the fixing bolt 35 .

[0035] A method for operating a durability testing device for a plastic film comprises the following steps:

[0036] Step 1. The device is equipped with three detection methods. First, the first detection method is performed. The plastic film sample to be tested is placed on the detection plate 33. Then, the fixing bolt 35 is adjusted so that the clamp fixes the film on the detection plate 33. After the fixing is completed, the first motor 3 is controlled to drive the stud 4 to rotate. At this time, the nut block 5 drives the top component of the stud 4 through the support plate 8 to approach the side of the detection plate 33 as the stud 4 rotates, until the rotating cylinder 15 is attached to the surface of the film, and the friction layer 27 on the outer wall of the rotating cylinder 15 is in contact with the film. Then, the detection is performed, and the second motor 9 is turned on to run. Through the transmission between the two transmission wheels 17 and the belt 18, the rotating cylinder 15 is rotated, and the friction layer 27 rotates on the film to perform wear resistance detection on the film. After the detection is completed, the first motor 3 is turned off and the first motor 3 is controlled to move the rotating cylinder 15 to the right for a certain distance. Then the detection personnel evaluate the durability of the film by observing the degree of wear of the film.

[0037] Step 2, then carry out the second detection method. After removing the film, repeat the above fixing steps to re-fix the new film on the detection plate 33, and then start the second motor 9 again to make the friction layer 27 on the rotating cylinder 15 contact with the film, and then adjust the limit bolt 30 to disengage it from the limit groove 31, and then start the fourth motor 24 to rotate the cam 20. During the rotation of the cam 20, the inner shell 12 is pushed to move up and down. The pulley 22 at the bottom of the inner shell 12 slides inside the guide groove 21 on the cam 20 as the cam 20 rotates, ensuring that the inner shell 12 moves up and down smoothly. Due to the presence of the first spring 19, the pulley 22 will always roll inside the guide groove 21 as the cam 20 rotates. As the cam 20 rotates, the friction layer 27 on the rotating cylinder 15 rubs up and down on the surface of the film. After the operation is completed, the rotating cylinder 15 is controlled to move to the right again to a certain distance, and then the degree of wear on the surface of the film is observed to evaluate the film.

[0038] Step three, finally perform the third detection method, repeat the above steps to fix the film on the detection plate 33, control the second motor 9 to drive the outer shell 10 to rotate, rotate the friction block 26 to one side of the film, and then control the first motor 3 again to move the friction block 26 to one side of the film, so that the friction layer 27 on the friction block 26 contacts the film, and then start the vibrator 29 to run. The friction block 26 is connected to the second spring 28, and the vibrator 29 makes the friction block 26 vibrate. At this time, the friction layer 27 rubs against the film through vibration. After the operation is completed, control the first motor 3 to make the friction block 26 leave the film, and finally observe the degree of wear of the film.

[0039] Step 4: Use the above three detection methods to simulate different types of friction on the film to detect and evaluate it.

[0040] In summary, the durability testing device for plastic film, through the design of the outer shell 10, the inner shell 12, the rotating cylinder 15, the third motor 16, the first spring 19, the cam 20, the guide groove 21, the pulley 22, the fourth motor 24, the friction block 26, the friction layer 27, the second spring 28 and the vibrator 29, adopts different methods to simulate the durability testing of the plastic film. The first testing method simulates the wear of the film under continuous friction by the continuous rotation of the rotating cylinder 15, which is suitable for evaluating the basic wear resistance of the film. The second testing method simulates the wear of the film under continuous friction by the continuous rotation of the cam. The rotation of 20 drives the inner shell 12 and the rotating cylinder 15 to move up and down, simulating the friction performance of the film when subjected to dynamic pressure changes, which helps to reveal the durability of the film in a complex stress environment. The third detection method uses a vibrator 29 to drive the friction block 26 to vibrate, thereby simulating the friction and wear of the film in a vibration environment, which is of great significance for evaluating the durability of the film in vibrating equipment or during transportation. This multiple detection method can more comprehensively and accurately evaluate the durability of the film in different application scenarios, providing strong technical support for the quality control of the film.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A durability testing device for a plastic film, comprising a base (1), characterized in that: A support platform (2) is provided at a center position on the upper end of the base (1); a first motor (3) is fixedly installed on one side of the base (1); a stud (4) is provided on one side of the first motor (3); a nut block (5) is threadedly connected at a center position on the surface of the stud (4); support plates (8) are fixedly connected on both sides of the top of the nut block (5); an outer shell (10) is provided at the upper end of the support platform (2); a second motor (9) is fixedly installed at the center of the bottom of the support platform (2); an inner shell (12) is provided at a top position inside the outer shell (10) A rotating cylinder (15) is provided on one side of the inner shell (12), and a rotating rod (23) is fixedly connected to the center of the top and bottom of the rotating cylinder (15). A third motor (16) is fixedly installed on the top of one side of the inner shell (12). First springs (19) are fixedly connected to the four corners of the top of the inner shell (12), and the tops of the four first springs (19) are fixedly connected to the inner top of the outer shell (10). A cam (20) is provided at the center of the inner bottom of the outer shell (10), and a guide groove (21) is provided on the outer wall of the cam (20). A pulley (22) is fixedly installed at the center of the bottom of the shell (12), the bottom of the pulley (22) penetrates into the interior of the guide groove (21) and contacts the inner wall of the guide groove (21), a fourth motor (24) is fixedly installed at a central position of the bottom of the front surface of the outer shell (10), a connecting frame (25) is fixedly connected to one side of the outer wall of the outer shell (10), a friction block (26) is provided on one side of the connecting frame (25), one side of the friction block (26) and the outer wall of the rotating cylinder (15) are both bonded with a friction layer (27) by an adhesive, and one side of the friction block (26) A mounting groove is provided at the center, a vibrator (29) is fixedly installed inside the mounting groove, the front end and rear end of the top and bottom of the friction block (26) and the four corners of one side are fixedly connected with second springs (28), one end of each of the eight second springs (28) is fixedly connected to the outer wall of the connecting frame (25), a vertical plate (32) is fixedly installed on the other side of the top of the base (1), a detection plate (33) is fixedly installed on one side of the vertical plate (32) near the top, and a bracket (34) is fixedly connected to the upper end and the lower end of the detection plate (33) on one side of the vertical plate (32) respectively.

2. A plastic film durability testing device according to claim 1, characterized in that: The first motor (3) is fixedly connected to a first output shaft through an output end on one side thereof, one side of the first output shaft is fixedly connected to one end of a stud (4), the other end of the stud (4) is movably connected to a bearing fixedly installed at the center of the other side of the base (1), the center of the bottom of the nut block (5) is fixedly connected to a first slider (7), the inner bottom of the base (1) is provided with a first slide groove (6), the lower end of the first slider (7) extends to the inside of the first slide groove (6) and is slidably connected to the inner wall of the first slide groove (6), a transverse groove is provided at one side of the top of the base (1), the upper ends of the two support plates (8) are both extended to the outside of the transverse groove and are fixedly connected to the two sides of the bottom of the support platform (2).

3. The durability testing device for plastic film according to claim 1, characterized in that: The second motor (9) is fixedly connected to a second output shaft through an output end at the top thereof, the upper end of the second output shaft penetrates to the outside of the support platform (2) and is fixedly connected to the center of the bottom of the outer shell (10), the top of the support platform (2) is provided with an annular rolling groove, the bottom of the outer shell (10) is rollingly mounted with steel balls (11), the number of the steel balls (11) is several, the number of the annular rolling grooves is three, the bottoms of the several steel balls (11) respectively penetrate into the interior of the three annular rolling grooves and contact the inner walls of the annular rolling grooves.

4. The durability testing device for plastic film according to claim 1, characterized in that: A second sliding block (14) is fixedly connected to one side of the inner shell (12) at a top position and a bottom position, and a second sliding groove (13) is opened on the inner wall of the outer shell (10) at one side corresponding to the two second sliding blocks (14), and one side of the two second sliding blocks (14) extends into the interior of the two second sliding grooves (13) and is slidably connected to the inner wall of the second sliding groove (13).

5. The durability testing device for plastic film according to claim 1, characterized in that: The top and bottom of the two rotating rods (23) are movably connected to bearings fixedly installed on one side of the top and bottom of the inner shell (12), respectively. One side of the rotating cylinder (15) passes through the outside of the inner shell (12) and the outer shell (10) in sequence. The third motor (16) is fixedly connected to a third output shaft through its top output end. A transmission wheel (17) is fixedly installed on the surface of the rotating rod (23) arranged at the upper end and the top of the third output shaft. The two transmission wheels (17) are connected by belts (18). The fourth motor (24) is fixedly connected to a fourth output shaft through its rear surface output end. The rear end of the fourth output shaft passes through the interior of the outer shell (10) and is fixedly connected to a top position near the center of the front surface of the cam (20).

6. The durability testing device for plastic film according to claim 1, characterized in that: A limiting bolt (30) is threadedly connected to a center position of one side of the outer shell (10), and a limiting groove (31) is provided at a center position of one side of the inner shell (12). One end of the limiting bolt (30) penetrates into the interior of the outer shell (10) and is clamped with the inner wall of the limiting groove (31).

7. The durability testing device for plastic film according to claim 1, characterized in that: One side of the two brackets (34) is threadedly connected with a fixing bolt (35), and one end of the fixing bolt (35) penetrates the outside of the bracket (34) and is fixedly connected with a clamping block.

8. The operation method of the durability testing device for plastic film according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: The device is equipped with three detection methods. First, the first detection method is performed. The plastic film sample to be tested is placed on the detection plate (33). Then, the fixing bolt (35) is adjusted so that the clamping block fixes the film on the detection plate (33). After the fixing is completed, the first motor (3) is controlled to drive the stud (4) to rotate. At this time, the nut block (5) drives the top component of the stud (4) to approach the detection plate (33) through the support plate (8) as the stud (4) rotates, until the rotating cylinder (15) is attached to the surface of the film. The friction layer (27) on the outer wall of the rotating cylinder (15) is brought into contact with the film. Then, the test is performed. The second motor (9) is turned on and the rotating cylinder (15) is rotated through the transmission between the two transmission wheels (17) and the belt (18). The friction layer (27) rotates on the film to perform a wear test on the film. After the test is completed, the first motor (3) is turned off and the first motor (3) is controlled to move the rotating cylinder (15) to the right for a certain distance. Then, the tester evaluates the durability of the film by observing the degree of wear of the film. Step 2, then proceed to the second detection method, after removing the film, repeat the above fixing steps to re-fix the new film on the detection plate (33), then start the second motor (9) again to make the friction layer (27) on the rotating cylinder (15) contact with the film, then adjust the limit bolt (30) to make it disengage from the limit groove (31), and then start the fourth motor (24) to rotate the cam (20). During the rotation process, the cam (20) pushes the inner shell (12) to move up and down, and the pulley (22) at the bottom of the inner shell (12) moves along with the cam The rotation of the wheel (20) slides inside the guide groove (21) on the cam (20), ensuring the smooth up and down movement of the inner shell (12). Due to the presence of the first spring (19), the pulley (22) will always roll inside the guide groove (21) as the cam (20) rotates. As the cam (20) rotates, the friction layer (27) on the rotating cylinder (15) rubs up and down on the surface of the film. After the operation is completed, the rotating cylinder (15) is controlled to move to the right again to a certain distance, and then the wear degree of the film surface is observed to evaluate the film. Step three, finally, the third detection method is performed. After repeating the above steps to fix the film on the detection plate (33), the second motor (9) is controlled to drive the outer shell (10) to rotate, and the friction block (26) is rotated to one side of the film. Then, the first motor (3) is controlled again to move the friction block (26) to one side of the film, so that the friction layer (27) on the friction block (26) contacts the film. Then, the vibrator (29) is started to operate. The friction block (26) is connected to the second spring (28), and the vibrator (29) is used to make the friction block (26) vibrate. At this time, the friction layer (27) rubs against the film through vibration. After the operation is completed, the first motor (3) is controlled to make the friction block (26) leave the film, and finally the wear degree of the film is observed. Step 4: Use the above three detection methods to simulate different types of friction on the film to detect and evaluate it.

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