A protective film tensile strength testing device and method

Abstract

This invention discloses a protective film tensile strength testing device and method, relating to the field of protective film strength testing technology. It includes a horizontal moving mechanism and a vertical moving mechanism. An outer mounting base is installed on one side of the vertical moving mechanism, and a laser cutter is installed inside the outer mounting base. In this invention, when the cylinder rod of the double-rod cylinder retracts, the hanging seat drives the laser cutter upwards. During this upward movement, the top rod pushes the ball bearings in the U-shaped groove to roll, and the ball bearings exert downward pressure on the lower pressure rod. The horizontal pressure rod at the end of the lower pressure rod then presses against the clamping cam. The rubber plate provides a certain amount of skew allowance when the buckle and the clamping post are engaged, ensuring the protective film is clamped tightly and preventing it from falling off during the tensile test. After the tensile test is completed, the buckle and the clamping post can be released by manually prying the clamping post to one side, allowing the broken protective film to be removed. The structure is simple and the operation is convenient.

Description

Technical Field

[0001] This invention specifically relates to the field of protective film strength testing technology, and more specifically to a protective film tensile strength testing device and method. Background Technology

[0002] Tensile strength testing devices (also known as "tensile testing machines") measure the maximum load and deformation at the time of fracture by applying axial tension to a protective film, thereby evaluating the tensile strength, elongation and other indicators of the material.

[0003] Chinese Patent Publication No. CN117571475A discloses a tensile testing device for protective film production. It includes a frame and an electric lead screw mounted on the frame. A movable plate is slidably connected to the top of the frame and threadedly connected to the electric lead screw. A placement plate for placing the protective film is fixedly connected to the rear top of the frame. Rotating screws are symmetrically rotatably connected to both the movable plate and the placement plate.

[0004] The protective film tensile testing equipment in the aforementioned patent requires manual determination of the length and width of the protective film during testing to ensure the accuracy of the test data. Furthermore, manual clamping is required when mounting the protective film, making it extremely inconvenient to use. Summary of the Invention

[0005] The purpose of this invention is to provide a protective film tensile strength testing device and method. After placing the protective film in a designated position, its dimensions can be further processed by laser cutting, thereby ensuring that the protective film produces more accurate values ​​during tensile testing. Furthermore, the clamping of the protective film requires no manual operation, greatly reducing labor intensity. This addresses the technical problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A protective film tensile strength testing device includes a lateral moving mechanism, on which a vertical moving mechanism is mounted; an outer mounting base is mounted on one side of the vertical moving mechanism, and two hanging seats are slidably connected on the side where the outer mounting base connects to the vertical moving mechanism, with a laser cutter mounted between the two hanging seats; the hanging seats are also fixedly connected to the cylinder rod of a double-rod cylinder, with the double-rod cylinder fixed inside the mounting base.

[0008] The laser cutter is provided with a stretching mechanism at its lower part; the stretching mechanism includes a base plate, and a first pressing member and a second pressing member are respectively fixed above both ends of the base plate; the first pressing member and the second pressing member are composed of the same structure and are arranged symmetrically.

[0009] The inner side of the first pressing member is fixed with a tension cylinder by a clamp, and the end of the cylinder rod of the tension cylinder is connected to a tension sensor; the other end of the tension sensor is fixedly connected to the second pressing member.

[0010] As a further technical solution of the present invention, the first pressing member includes a fixed base, on which two support frames are fixed; a pressing cam is movably connected to the support frame, and a buckle is provided on the bottom side of the pressing cam;

[0011] When the clamping cam clamps the protective film, the buckle engages and secures it with the clamping post.

[0012] As a further technical solution of the present invention, the two ends of the locking post are slidably connected in the inclined frame, and a clamping spring for clamping the locking post is also provided in the inclined frame; a rubber plate is also bonded to the upper surface of the fixing seat.

[0013] As a further technical solution of the present invention, a protective film adsorption frame is provided between the first pressing member and the second pressing member; the protective film adsorption frame is hollow inside and has several suction holes on the top.

[0014] Angle irons are fixed at the four corners of the bottom of the protective film adsorption frame and are slidably connected to a rectangular frame on the base plate; the bottom of the protective film adsorption frame is also provided with a drive frame for lifting and lowering control of the protective film adsorption frame.

[0015] As a further technical solution of the present invention, the drive frame is composed of two sets of crank connecting rod assemblies and is connected in cooperation with the drive cylinder; the drive cylinder is fixed to the bottom of the base plate.

[0016] As a further technical solution of the present invention, a driving assembly is provided above the stretching mechanism. The driving assembly includes an inverted U-shaped groove opened on the outside of the outer mounting base. A top frame is movably connected to one end of the two U-shaped grooves that are close to each other. A number of balls are evenly distributed in the U-shaped grooves. A pressure rod is slidably connected to one side of the two U-shaped grooves that are far apart from each other. The pressure rod is T-shaped and a spring is sleeved on the outside of the pressure rod. The spring is located in the U-shaped groove.

[0017] A horizontal pressure bar is also welded to the lower end of the aforementioned pressure bar.

[0018] As a further technical solution of the present invention, the stretching mechanism is fixed inside the sliding seat; the sliding seat is fitted onto the linear drive module; the linear drive module is fixed to the base by screws;

[0019] The base is also fixed with a bracket for fixing the lateral movement mechanism, and a PLC controller is also installed on one side of the bracket.

[0020] As a further technical solution of the present invention, the lateral moving mechanism includes a lateral slide rail fixed to the inner side of the upper end of the bracket, and a vertical moving mechanism is slidably connected to the lateral slide rail; a lateral driving cylinder is fixed to the outer side of the bracket, and a push rod is fixed to the end of the cylinder rod of the lateral driving cylinder; the push rod is fixed to the vertical moving mechanism.

[0021] As a further technical solution of the present invention, the vertical moving mechanism includes a transverse slide, on which a rotary motor is mounted; a synchronous pulley is fitted on the output shaft of the rotary motor, and a synchronous belt is fitted between the synchronous pulley and another synchronous pulley;

[0022] The timing belt has a clamping block riveted to one side, and the clamping block is fixed to the fixing plate by screws; the fixing plate is slidably connected to the longitudinal slide rail installed on the inner side of the transverse slide.

[0023] A proximity switch is also fixed to one side of the upper end of the fixed plate.

[0024] A method for using a protective film tensile strength testing device includes the following steps;

[0025] Step 1: Placement of the protective film. Place the sample with the protective film on the protective film adsorption frame. Use the negative pressure generated by the protective film adsorption frame to adsorb the protective film. Then use a laser cutter to cut the length and width of the protective film to ensure that the size of the sample meets the standard.

[0026] Step 2: Clamping of the protective film. After the protective film is cut, the drive assembly is activated, causing the first and second clamping members to press the protective film tightly. Then, the cylinder rod of the tension cylinder extends, and the first and second clamping members move away from each other along the slide rails that are set together at their bottoms. The pressure is continuously applied until the protective film breaks. At this time, the value generated by the tension sensor is the tensile strength of the protective film.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] In this invention, the cylinder rod of the double-rod cylinder retracts, causing the hanger to move the laser cutter upward. During the upward movement, the push rod pushes the ball bearings in the U-shaped groove to roll, and the ball bearings exert pressure on the lower pressure rod, so the horizontal pressure rod at the end of the lower pressure rod presses against the clamping cam.

[0029] The rubber plate in this invention provides a certain amount of skew allowance when the buckle and the post are engaged and fixed, which ensures the protective film is clamped tightly and prevents it from falling off during tensile testing.

[0030] This invention allows for easy removal of the broken protective film by simply manually prying the locking post to one side after the tensile test is completed. The structure is simple and the operation is convenient. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0032] Figure 2 In this invention Figure 1 Another perspective illustration.

[0033] Figure 3 In this invention Figure 2 A partial structural diagram.

[0034] Figure 4 In this invention Figure 3 Another perspective illustration.

[0035] Figure 5 In this invention Figure 3 The diagram on the right side shows the structure.

[0036] Figure 6 In this invention Figure 3 Another illustration of the display method.

[0037] Figure 7 In this invention Figure 6 The main view.

[0038] Figure 8 This is a schematic diagram of the tensioning mechanism in this invention.

[0039] Figure 9 In this invention Figure 1 Enlarged diagram of point A.

[0040] Figure 10 In this invention Figure 2 Enlarged diagram of point B.

[0041] Figure 11 In this invention Figure 4 Enlarged diagram of point C.

[0042] Figure 12 In this invention Figure 6 Enlarged diagram of point D.

[0043] In the diagram: 1-base, 2-bracket, 3-transverse slide rail, 4-transverse drive cylinder, 5-push rod, 6-transverse carriage, 7-longitudinal slide rail, 8-longitudinal slide block, 9-rotary motor, 10-synchronous pulley, 11-synchronous belt, 12-clamping block, 13-fixed plate, 14-outer mounting base, 15-proximity switch, 16-laser cutter, 17-drive assembly, 18-tensioning mechanism, 19-linear drive module, 20-sliding seat, 21-hanging seat, 22-double rod cylinder, 23-PLC controller;

[0044] 171-Top frame, 172-Top rod, 173-U-groove, 174-Ball bearing, 175-Spring, 176-Down pressure rod, 177-Horizontal pressure rod;

[0045] 181-Base plate, 182-Drive frame, 183-Drive cylinder, 184-Protective film adsorption frame, 185-First pressing component, 186-Second pressing component, 187-Tension cylinder, 188-Tension sensor;

[0046] 1851-Fixed seat, 1852-Support frame, 1853-Pressure cam, 1854-Inclined frame, 1855-Clip post, 1856-Pressure spring, 1857-Rubber plate, 1858-Snap fastener. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Please see Figures 1 to 12 In this embodiment of the invention, a protective film tensile strength testing device includes a lateral moving mechanism, on which a vertical moving mechanism is mounted; an outer mounting base 14 is mounted on one side of the vertical moving mechanism, and two hanging seats 21 are slidably connected to the side of the outer mounting base 14 connected to the vertical moving mechanism, and a laser cutter 16 is mounted between the two hanging seats 21; the hanging seats 21 are also fixedly connected to the cylinder rod of a double-rod cylinder 22, and the double-rod cylinder 22 is fixed inside the mounting base 14.

[0049] The laser cutter 16 is provided with a tensioning mechanism 18 below it; the tensioning mechanism 18 includes a base plate 181, and a first pressing member 185 and a second pressing member 186 are respectively fixed above both ends of the base plate 181; the first pressing member 185 and the second pressing member 186 are composed of the same structure and are arranged symmetrically.

[0050] The inner side of the first pressing member 185 is fixed with a tension cylinder 187 by a clamp, and the end of the cylinder rod of the tension cylinder 187 is connected to a tension sensor 188; the other end of the tension sensor 188 is fixedly connected to the second pressing member 186.

[0051] By adopting the above technical solution, after the protective film is cut, the drive component 17 is activated, causing the first pressing member 185 and the second pressing member 186 to press the protective film tightly. Then, the cylinder rod of the tension cylinder 187 extends, and the first pressing member 185 and the second pressing member 186 move away in opposite directions along the slide rail that is set at their bottoms. The pressure is continuously applied until the protective film breaks. At this time, the value generated by the tension sensor 188 is the tensile strength of the protective film.

[0052] The tensile sensor 188 uses a strain gauge tensile sensor (based on the resistance strain effect, converting tensile force into an electrical signal) or a piezoelectric sensor (suitable for high-frequency dynamic measurement). The range needs to cover 1.5-2 times the expected breaking force of the protective film (e.g., if the breaking force of the protective film is about 100N, a 200N range sensor can be selected). The tensile sensor 188 is connected to the PLC controller via a signal line. The PLC controller is also electrically connected to the display screen for reading data during tensile testing.

[0053] Please see the appendix Figure 9 and 12 In this embodiment, a protective film adsorption frame 184 is provided between the first pressing member 185 and the second pressing member 186; the protective film adsorption frame 184 is hollow inside and has several suction holes on the top.

[0054] Angle irons are fixed at the four corners of the bottom of the protective film adsorption frame 184 and are slidably connected to the rectangular frame opened on the base plate 181; the bottom of the protective film adsorption frame 184 is also provided with a drive frame 182 for lifting control of the protective film adsorption frame 184.

[0055] Standards for materials mechanics testing include common ASTM or ISO standards, and possibly domestic GB standards. The sample size for tensile tests is usually determined according to the standard, and different materials may have different requirements.

[0056] For example, in ASTM D882, the sample may be dumbbell-shaped, with specified width and length of the parallel section in the middle, or it may be a rectangular sample. For instance, the narrow section of a dumbbell-shaped sample may be 6mm wide, and the total length may vary depending on the standard, such as around 150mm, with a gauge length of 50mm or 100mm.

[0057] Therefore, when conducting tensile tests on protective films, it is necessary to select the length and width of the specimen according to the standards, such as: ASTM D882 (Tension properties of plastic films and sheets), ISO 527-3 (Tension properties of plastic films and sheets), and GB / T 1040.3 (Tension properties of plastic films).

[0058] By adopting the above technical solution, the prepared sample is placed on the protective film adsorption frame 184, and the protective film is adsorbed by the protective film adsorption frame 184 to ensure that the posture of the protective film does not change, thereby facilitating the laser cutter 16 to perform laser cutting on the protective film, thus ensuring that the size of the sample is qualified.

[0059] In this embodiment, the drive frame 182 is composed of two sets of crank connecting rod assemblies and is connected to the drive cylinder 183; the drive cylinder 183 is fixed to the bottom of the base plate 181.

[0060] By adopting the above technical solution, after the cutting is completed, the cylinder rod of the drive cylinder 183 retracts, causing the drive frame 182 to swing. The protective film adsorption frame 184 then slides down under its own weight. At this time, the two ends of the protective film are placed on the first pressing member 185 and the second pressing member 186 to clamp the protective film.

[0061] Subsequently, the protective film adsorption frame 184 will continue to descend into the rectangular frame inside the base plate 181, thereby avoiding the protective film adsorption frame 184 from affecting the tensile strength test of the protective film.

[0062] Please see the appendix Figure 12 In this embodiment, a drive assembly 17 is provided above the stretching mechanism 18. The drive assembly 17 includes an inverted U-shaped groove 173 opened on the outside of the outer mounting base 14. A top frame 171 is movably connected to one end of the two U-shaped grooves 173 that are close to each other. A plurality of balls 174 are evenly distributed in the U-shaped grooves 173. A pressing rod 176 is slidably connected to the side of the two U-shaped grooves 173 that are far apart from each other. The pressing rod 176 is T-shaped and a spring 175 is sleeved on the outside of the pressing rod 176. The spring 175 is located in the U-shaped groove 173.

[0063] The lower end of the pressure rod 176 is also welded with a horizontal pressure rod 177.

[0064] By adopting the above technical solution, after the protective film is cut, the cylinder rod of the double-rod cylinder 22 retracts, causing the hanging seat 21 to drive the laser cutter 16 to move upward. During the upward movement, the push rod 172 will push the ball 174 in the U-shaped groove 173 to roll, and the ball 174 will exert pressure on the lower pressure rod 176. The horizontal pressure rod 177 at the end of the lower pressure rod 176 will press against the clamping cam 1853.

[0065] At this time, the clamping cam 1853 flips over, and the buckle 1858 located below the clamping cam 1853 engages with the locking post 1855, thereby achieving the clamping and fixing of the protective film by the clamping cam 1853; so as to facilitate the subsequent tensile test of the protective film; the clamping of the protective film does not require manual operation, which greatly reduces the intensity of manual labor.

[0066] Please see the appendix Figure 12 In this embodiment, the first pressing member 185 includes a fixed base 1851, on which two support frames 1852 are fixed; a pressing cam 1853 is movably connected to the support frame 1852, and a buckle 1858 is provided on the bottom side of the pressing cam 1853.

[0067] When the pressing cam 1853 presses the protective film, the buckle 1858 and the locking post 1855 engage and fix it.

[0068] More specifically, the two ends of the locking post 1855 are slidably connected in the inclined frame 1854, and a clamping spring 1856 for clamping the locking post 1855 is also provided in the inclined frame 1854; a rubber plate 1857 is also bonded to the upper surface of the fixing seat 1851.

[0069] By adopting the above technical solution, the setting of the rubber plate 1857 allows for a certain amount of skew allowance when the buckle 1858 and the clip post 1855 are engaged and fixed, thus ensuring the clamping of the protective film and preventing it from falling off during the tensile test.

[0070] In this embodiment, the tensioning mechanism 18 is fixed inside the sliding seat 20; the sliding seat 20 is fitted onto the linear drive module 19; the linear drive module 19 is fixed to the base 1 by screws.

[0071] The base 1 is also fixed with a bracket 2 for fixing the lateral movement mechanism, and a PLC controller 23 is also installed on one side of the bracket 2.

[0072] More specifically, the lateral movement mechanism includes a lateral slide rail 3 fixed to the inner side of the upper end of the bracket 2, on which a vertical movement mechanism is slidably connected; a lateral drive cylinder 4 is fixed to the outer side of the bracket 2, and a push rod 5 is fixed to the end of the cylinder rod of the lateral drive cylinder 4; the push rod 5 is fixed to the vertical movement mechanism.

[0073] By adopting the above technical solution, the width direction of the protective film is the direction in which the linear drive module 19 drives the sliding seat 20 to move, and the direction in which the cylinder rod of the transverse drive cylinder 4 extends is the length direction of the protective film. When the cylinder rod of the transverse drive cylinder 4 retracts, it can drive the vertical moving mechanism to move along the transverse slide rail 3 through the push rod 5. In this way, the laser cutter 16 can cut the length and width of the protective film, thereby ensuring the length and width of the protective film sample.

[0074] In this embodiment, the vertical moving mechanism includes a horizontal slide 6, on which a rotary motor 9 is mounted; a synchronous pulley 10 is mounted on the output shaft of the rotary motor 9, and a synchronous belt 11 is mounted between the synchronous pulley 10 and another synchronous pulley.

[0075] A clamping block 12 is riveted to one side of the synchronous belt 11, and the clamping block 12 is fixed to the fixing plate 13 by screws; the fixing plate 13 is slidably connected to the longitudinal slide rail 7 installed inside the transverse slide 6; a proximity switch 15 is also fixed to one side of the upper end of the fixing plate 13.

[0076] By adopting the above technical solution, when the rotary motor 9 rotates, it can drive the clamping block 12 together with the vertical moving mechanism in cooperation with the synchronous pulley 10 and the synchronous belt 11. This can adjust the height of the vertical moving mechanism. First, it is to ensure that when the cylinder rod of the double-rod cylinder 22 extends, the laser cutter 16 can cut the protective film. When the cylinder rod of the double-rod cylinder 22 retracts, the horizontal pressure rod 177 can be accurately pressed on the clamping cam 1853, and the buckle 1858 and the locking post 1855 can be engaged.

[0077] Furthermore, after the tensile test is completed, the buckle 1858 and the buckle 1855 can be released by manually bending the buckle 1855 to one side, so that the broken protective film can be removed. The structure is simple and the operation is convenient.

[0078] In this embodiment, the proximity switch 15 is used to limit the retraction of the double-rod cylinder 22, preventing excessive retraction that would cause the horizontal pressure rod 177 to excessively press the protective film.

[0079] PLC controllers are used for the logic control of various drive components.

[0080] A method for using a protective film tensile strength testing device includes the following steps;

[0081] Step 1: Placement of the protective film. Place the prepared sample on the protective film adsorption frame 184. The protective film is adsorbed by the protective film adsorption frame 184 to ensure that the posture of the protective film does not change, so that the laser cutter 16 can perform laser cutting on the protective film, thereby ensuring that the size of the sample is qualified.

[0082] Step 2, cutting the protective film: When the rotary motor 9 rotates, it can drive the clamping block 12 together with the vertical moving mechanism in cooperation with the synchronous wheel 10 and the synchronous belt 11. This can adjust the height of the vertical moving mechanism. When the cylinder rod of the double-rod cylinder 22 extends, the laser cutter 16 can cut the protective film.

[0083] Step 3: Fixing the protective film. After cutting the protective film, the cylinder rod of the double-rod cylinder 22 retracts, causing the hanging base 21 to move the laser cutter 16 upward. During the upward movement, the push rod 172 pushes the ball 174 in the U-shaped groove 173 to roll. The ball 174 then exerts pressure on the lower pressure rod 176, causing the horizontal pressure rod 177 at the end of the lower pressure rod 176 to press against the clamping cam 1853. At this time, the clamping cam 1853 flips, and the buckle 1858 located below the clamping cam 1853 engages with the locking post 1855, thereby achieving the clamping and fixing of the protective film by the clamping cam 1853, so as to facilitate the subsequent tensile test of the protective film.

[0084] Step four, the tensile test of the protective film. The cylinder rod of the tension cylinder 187 extends, and the first pressing member 185 and the second pressing member 186 move away from each other along the slide rail that is set at their bottoms. The pressure is continuously applied until the protective film breaks. At this time, the value generated by the tension sensor 188 is the tensile strength of the protective film.

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0086] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A protective film tensile strength testing device, characterized in that: It includes a horizontal moving mechanism, on which a vertical moving mechanism is installed; an outer mounting base (14) is installed on one side of the vertical moving mechanism, and two hanging seats (21) are slidably connected on the side where the outer mounting base (14) connects to the vertical moving mechanism, and a laser cutter (16) is installed between the two hanging seats (21); the hanging seats (21) are also fixedly connected to the cylinder rod of a double-rod cylinder (22), and the double-rod cylinder (22) is fixed on the inner side of the mounting base (14); The laser cutter (16) is provided with a tensioning mechanism (18) below it; the tensioning mechanism (18) includes a base plate (181), and a first pressing member (185) and a second pressing member (186) are fixed above both ends of the base plate (181); the first pressing member (185) and the second pressing member (186) are composed of the same structure and are arranged symmetrically. The inner side of the first holding member (185) is fixed with a tension cylinder (187) by a clamp, and the end of the cylinder rod of the tension cylinder (187) is connected to a tension sensor (188); the other end of the tension sensor (188) is fixedly connected to the second holding member (186).

2. The protective film tensile strength testing device according to claim 1, characterized in that: The first pressing member (185) includes a fixed base (1851), on which two support frames (1852) are fixed; a pressing cam (1853) is movably connected to the support frame (1852), and a buckle (1858) is provided on the bottom side of the pressing cam (1853). When the pressing cam (1853) presses the protective film, the buckle (1858) and the locking post (1855) engage and fix it.

3. The protective film tensile strength testing device according to claim 2, characterized in that: The two ends of the locking post (1855) are slidably connected in the inclined frame (1854), and a clamping spring (1856) for clamping the locking post (1855) is also provided in the inclined frame (1854); a rubber plate (1857) is also bonded to the upper surface of the fixing seat (1851).

4. The protective film tensile strength testing device according to claim 1, characterized in that: A protective film adsorption frame (184) is provided between the first pressing member (185) and the second pressing member (186); the protective film adsorption frame (184) is hollow inside and has several suction holes on the top. Angle irons are fixed at the four corners of the bottom of the protective film adsorption frame (184) and are slidably connected to the rectangular frame opened on the base plate (181); the bottom of the protective film adsorption frame (184) is also provided with a drive frame (182) for lifting control of the protective film adsorption frame (184).

5. The protective film tensile strength testing device according to claim 4, characterized in that: The drive frame (182) consists of two sets of crank connecting rod assemblies and is connected to the drive cylinder (183); the drive cylinder (183) is fixed to the bottom of the base plate (181).

6. The protective film tensile strength testing device according to claim 4, characterized in that: The tensioning mechanism (18) is provided with a drive assembly (17) above it. The drive assembly (17) includes an inverted U-shaped groove (173) opened on the outside of the outer mounting base (14). A top frame (171) is movably connected to one end of the two U-shaped grooves (173) that are close to each other. A number of balls (174) are evenly distributed in the U-shaped grooves (173). A pressure rod (176) is slidably connected in the side of the two U-shaped grooves (173) that are far apart from each other. The pressure rod (176) is T-shaped and a spring (175) is sleeved on the outside of the pressure rod (176). The spring (175) is located in the U-shaped groove (173). The lower end of the aforementioned pressure bar (176) is also welded with a horizontal pressure bar (177).

7. The protective film tensile strength testing device according to claim 1, characterized in that: The tensioning mechanism (18) is fixed inside the sliding seat (20); the sliding seat (20) is fitted into the linear drive module (19); the linear drive module (19) is fixed to the base (1) by screws; The base (1) is also fixed with a bracket (2) for fixing the lateral movement mechanism, and a PLC controller (23) is also installed on one side of the bracket (2).

8. The protective film tensile strength testing device according to claim 7, characterized in that: The lateral movement mechanism includes a lateral slide rail (3) fixed on the inner side of the upper end of the bracket (2), and a vertical movement mechanism is slidably connected on the lateral slide rail (3); a lateral drive cylinder (4) is fixed on the outer side of the bracket (2), and a push rod (5) is fixed at the end of the cylinder rod of the lateral drive cylinder (4); the push rod (5) is fixed to the vertical movement mechanism.

9. The protective film tensile strength testing device according to claim 7, characterized in that: The vertical moving mechanism includes a transverse slide (6), on which a rotary motor (9) is mounted; a synchronous pulley (10) is mounted on the output shaft of the rotary motor (9), and a synchronous belt (11) is mounted between the synchronous pulley (10) and another synchronous pulley. The timing belt (11) has a clamping block (12) riveted to one side, and the clamping block (12) is fixed to the fixing plate (13) by screws; the fixing plate (13) is slidably connected to the longitudinal slide rail (7) installed on the inner side of the transverse slide (6); A proximity switch (15) is also fixed on one side of the upper end of the fixed plate (13).

10. The method of using the protective film tensile strength testing device according to claim 6, characterized in that: Includes the following steps; Step 1: Placement of protective film. Place the sample of protective film on the protective film adsorption frame (184). Use the negative pressure generated by the protective film adsorption frame (184) to adsorb the protective film. Then use a laser cutter (16) to cut the length and width of the protective film to ensure that the size of the sample meets the standard. Step 2: Clamping of the protective film. After the protective film is cut, the drive assembly (17) is activated, so that the first clamping member (185) and the second clamping member (186) press the protective film tightly. Then the cylinder rod of the tension cylinder (187) extends. At this time, the first clamping member (185) and the second clamping member (186) move away from each other along the slide rail set at their bottoms. The pressure is continuously applied until the protective film breaks. At this time, the value generated by the tension sensor (188) is the tensile strength of the protective film.

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