Device and method for detecting tensile strength of protective film

Abstract

The invention discloses a protective film tensile strength detection device and method, and relates to the technical field of protective film strength detection, the protective film tensile strength detection device comprises a transverse moving mechanism and a vertical moving mechanism; an outer side mounting seat is mounted on one side of the vertical moving mechanism in a matched manner, and a laser cutter is arranged in the outer side mounting seat; according to the laser cutting device, when a cylinder rod of the double-rod air cylinder contracts, the lifting base drives the laser cutter to move upwards, in the upward moving process, an ejector rod can eject a ball in a U-shaped groove to roll, the ball generates downward pressing force on a downward pressing rod, and a transverse pressing rod arranged at the end of the downward pressing rod is pressed on a pressing cam; due to the arrangement of the rubber plate, a certain deflection allowance is formed when the buckle and the clamping column are clamped and fixed, so that the clamping of the protective film can be ensured, and the protective film is prevented from falling off during a tensile test; after the tensile test is finished, the clamping column is manually pulled towards one side, so that the clamping between the buckle and the clamping column can be released, the broken protective film can be detached, the structure is simple, and the operation is convenient.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of protective film strength detection, and in particular to a protective film tensile strength detection device and method. Background Art

[0002] The tensile strength testing device (also known as a "tensile testing machine") applies axial tension to the protective film and measures the maximum load and deformation when it breaks, thereby evaluating the material's tensile strength, elongation and other indicators.

[0003] Chinese Patent Publication No. CN117571475A discloses a protective film production tensile testing device. It comprises a frame and a motorized screw mounted on the frame. A movable plate is slidably connected to the top of the frame, which is threadedly connected to the motorized screw. A placement plate for placing protective films is fixed to the rear of the frame's top. Rotating screws are symmetrically connected to the movable plate and the placement plate.

[0004] The protective film tensile testing device described 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 clamping the protective film, making it extremely inconvenient to use. Summary of the Invention

[0005] The present invention aims to provide a protective film tensile strength testing device and method. After placing the protective film in a designated position, the protective film can be further sized by laser cutting, thereby ensuring that the protective film produces relatively accurate values ​​during tensile testing. Furthermore, the clamping of the protective film does not require manual operation, significantly reducing labor intensity. This solves the technical problems raised in the aforementioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A protective film tensile strength testing device includes a transverse movement mechanism, on which a vertical movement mechanism is mounted; an outer mounting seat is mounted on one side of the vertical movement mechanism; two hanging seats are slidably connected to the side where the outer mounting seat is connected to the vertical movement mechanism, and a laser cutter is mounted between the two hanging seats; the hanging seat is also fixedly connected to the cylinder rod of a double-rod cylinder, and the double-rod cylinder is fixed on the inner side of the mounting seat; A stretching mechanism is provided below the laser cutter; the stretching mechanism comprises a bottom plate, and a first pressing member and a second pressing member are fixed above both ends of the bottom plate respectively; the first pressing member and the second pressing member are composed of an ideal structure and are symmetrically arranged; A stretching cylinder is fixed to the inner side of the first pressing member through a clamp, and a tension sensor is connected to the end of the cylinder rod of the stretching cylinder; the other end of the tension sensor is fixedly connected to the second pressing member.

[0007] As a further technical solution of the present invention, the first pressing member includes a fixing seat, 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; When the pressing cam presses the protective film, the buckle is clamped and fixed to the clamping column.

[0008] As a further technical solution of the present invention, both ends of the clamping column are slidably connected in the tilting frame, and a tightening spring for tightening the clamping column is provided in the tilting frame; a rubber plate is also bonded to the upper surface of the fixing seat.

[0009] 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 a plurality of suction holes on the top; Angle irons are fixed at the four corners of the bottom of the protective film adsorption frame and are slidably connected to the rectangular frame opened on the bottom plate; a driving frame for controlling the lifting of the protective film adsorption frame is also provided at the bottom of the protective film adsorption frame.

[0010] As a further technical solution of the present invention, the driving frame is composed of two groups of crank-connecting rod assemblies and is connected with the driving cylinder; the driving cylinder is fixed to the bottom of the base plate.

[0011] As a further technical solution of the present invention, a driving assembly is provided above the stretching mechanism, and the driving assembly includes an inverted U-shaped groove opened on the outside of the outer mounting seat; a top frame is movably connected to the end of the two U-shaped grooves close to each other, and a plurality of balls are evenly distributed in the U-shaped grooves, and a lower pressure rod is slidably connected to the side of the two U-shaped grooves away from each other, and the lower pressure rod is T-shaped, and a spring is sleeved on the outside of the lower pressure rod; the spring is arranged in the U-shaped groove; The lower end of the lower pressure rod is also welded with a transverse pressure rod.

[0012] As a further technical solution of the present invention, the stretching mechanism is fixed in the sliding seat; the sliding seat is mounted in conjunction with the linear drive module; the linear drive module is fixed to the base by screws; A bracket for fixing the transverse moving mechanism is also fixed on the base, and a PLC controller is also installed on one side of the bracket.

[0013] As a further technical solution of the present invention, the horizontal moving mechanism includes a horizontal slide rail fixed on the inner side of the upper end of the bracket, and the vertical moving mechanism is slidably connected to the horizontal slide rail; a horizontal driving cylinder is fixed on the outer side of the bracket, and a push rod is fixed at the end of the cylinder rod of the horizontal driving cylinder; the push rod is fixed to the vertical moving mechanism.

[0014] As a further technical solution of the present invention, the vertical movement mechanism includes a transverse slide, on which a rotary motor is mounted; a synchronous wheel is mounted on the output shaft of the rotary motor, and a synchronous belt is mounted between the synchronous wheel and another synchronous wheel; A clamping block is riveted on one side of the synchronous belt, 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; A proximity switch is also fixed on one side of the upper end of the fixing plate.

[0015] A method for using a protective film tensile strength testing device comprises the following steps: Step 1: Place the protective film. Place the protective film sample 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. Step 2: Clamping of the protective film. After the protective film is cut, the driving assembly is activated, causing the first and second pressing parts to press the protective film tightly. Then, the cylinder rod of the stretching cylinder is extended. At this time, the first and second pressing parts move away from each other along the slide rail, and 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.

[0016] Compared with the prior art, the present invention has the following beneficial effects: In this invention, the rod of the double-rod cylinder contracts, causing the hanger to drive the laser cutter upward. During the upward movement, the push rod pushes the ball in the U-shaped groove to roll, and the ball exerts downward pressure on the lower pressure rod, which in turn presses the horizontal pressure rod at the end of the lower pressure rod against the clamping cam. In the present invention, the provision of the rubber plate allows a certain amount of deflection when the buckle and the clamping column are clamped and fixed, thereby ensuring that the protective film is clamped tightly, thereby preventing it from falling off during the tensile test. According to the present invention, after the tensile test is completed, the clamping column only needs to be manually bent to one side to release the engagement between the buckle and the clamping column, so that the broken protective film can be removed. The structure is simple and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 In the present invention Figure 1 Schematic diagram from another perspective.

[0019] Figure 3 In the present invention Figure 2 Schematic diagram of part of the structure.

[0020] Figure 4 In the present invention Figure 3 Schematic diagram from another perspective.

[0021] Figure 5 In the present invention Figure 3 The right side structural diagram of .

[0022] Figure 6 In the present invention Figure 3 Schematic diagram of another display method.

[0023] Figure 7 In the present invention Figure 6 main view.

[0024] Figure 8 It is a structural schematic diagram of the stretching mechanism in the present invention.

[0025] Figure 9 In the present invention Figure 1 A magnified schematic diagram of .

[0026] Figure 10 In the present invention Figure 2 Enlarged schematic diagram of point B.

[0027] Figure 11 In the present invention Figure 4 Enlarged schematic diagram of point C.

[0028] Figure 12 In the present invention Figure 6 Enlarged schematic diagram of point D.

[0029] In the figure: 1-base, 2-bracket, 3-transverse slide, 4-transverse drive cylinder, 5-push rod, 6-transverse slide, 7-longitudinal slide, 8-longitudinal slide, 9-rotating motor, 10-synchronous pulley, 11-synchronous belt, 12-clamping block, 13-fixing plate, 14-outer mounting seat, 15-proximity switch, 16-laser cutter, 17-drive assembly, 18-stretching mechanism, 19-linear drive module, 20-sliding seat, 21-hanging seat, 22-double-rod cylinder, 23-PLC controller; 171-top frame, 172-top rod, 173-U-shaped groove, 174-ball, 175-spring, 176-down rod, 177-transverse rod; 181 - bottom plate, 182 - driving frame, 183 - driving cylinder, 184 - protective film adsorption frame, 185 - first pressing member, 186 - second pressing member, 187 - stretching cylinder, 188 - tension sensor; 1851-fixed seat, 1852-support frame, 1853-compression cam, 1854-tilt frame, 1855-clamping column, 1856-tensioning spring, 1857-rubber plate, 1858-clip. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0031] See also Figures 1 to 12 In an embodiment of the present invention, a protective film tensile strength testing device includes a lateral moving mechanism, on which a vertical moving mechanism is mounted; an outer mounting seat 14 is mounted on one side of the vertical moving mechanism, two hanging seats 21 are slidably connected to the side where the outer mounting seat 14 is connected to the vertical moving mechanism, and a laser cutter 16 is mounted between the two hanging seats 21; the hanging seat 21 is 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 seat 14; A stretching mechanism 18 is provided below the laser cutter 16. The stretching mechanism 18 includes a base plate 181, with a first pressing member 185 and a second pressing member 186 fixed above both ends of the base plate 181. The first pressing member 185 and the second pressing member 186 are formed of a conventional structure and are symmetrically arranged. A tensioning cylinder 187 is fixed to the inner side of the first pressing member 185 via a clamp, and a tension sensor 188 is connected to the end of the cylinder rod of the tensioning cylinder 187; the other end of the tension sensor 188 is fixedly connected to the second pressing member 186.

[0032] By adopting the above technical solution, after the protective film is cut, the driving component 17 is activated, so that the first pressing member 185 and the second pressing member 186 press the protective film, and then the cylinder rod of the stretching cylinder 187 is extended. At this time, the first pressing member 185 and the second pressing member 186 move away from each other along the slide rail, and continue to apply pressure until the protective film breaks. At this time, the value generated by the tension sensor 188 is the tensile strength of the protective film.

[0033] The tension sensor 188 uses a strain-type tension sensor (based on the resistance strain effect, converting tension into an electrical signal) or a piezoelectric sensor (suitable for high-frequency dynamic measurement). The range must cover 1.5-2 times the expected breaking force of the protective film (for example, if the breaking force of the protective film is about 100N, a 200N range sensor can be selected). The tension sensor 188 is connected to the PLC controller through a signal line, and the PLC controller is also electrically connected to the display screen for reading data during tension testing.

[0034] Please see the attached 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 a plurality of 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 bottom plate 181; the bottom of the protective film adsorption frame 184 is also provided with a driving frame 182 for controlling the lifting of the protective film adsorption frame 184.

[0035] Standards for material mechanics testing, such as the common ASTM or ISO standards, may also include domestic GB standards. The sample size for tensile testing is usually determined according to the standards, and different materials may have different requirements.

[0036] For example, in ASTM D882, the specimen may be dumbbell-shaped, with a specified width and length of the parallel center section, or rectangular. For example, the narrow section of a dumbbell-shaped specimen may be 6 mm wide, and the total length may vary depending on the standard, such as around 150 mm, with a gauge length of 50 mm or 100 mm.

[0037] Therefore, when performing a tensile test on a protective film, the length and width of the specimen must be selected according to the standard, such as: ASTM D882 (Tensile properties test of plastic films and sheets), ISO 527-3 (Tensile properties test of plastic films and sheets), and GB / T 1040.3 (Tensile properties test of plastic films).

[0038] 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 will not change, thereby facilitating the laser cutter 16 to perform laser cutting on the protective film, thereby ensuring that the size of the sample is qualified.

[0039] In this embodiment, the driving frame 182 is composed of two sets of crank-connecting rod assemblies and is connected to the driving cylinder 183; the driving cylinder 183 is fixed to the bottom of the base plate 181.

[0040] By adopting the above technical solution, after cutting is completed, the cylinder rod of the driving cylinder 183 contracts, causing the driving frame 182 to swing, and the protective film adsorption frame 184 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.

[0041] Then, the protective film adsorption frame 184 will continue to descend into the inner rectangular frame of the bottom plate 181 , thereby preventing the protective film adsorption frame 184 from affecting the tensile test of the protective film.

[0042] Please see the attached Figure 12 In this embodiment, a driving assembly 17 is provided above the stretching mechanism 18. The driving assembly 17 includes an inverted U-shaped groove 173 provided on the outside of the outer mounting seat 14; a top frame 171 is movably connected to one end of the two U-shaped grooves 173 that are close to each other, and a plurality of balls 174 are evenly distributed in the U-shaped grooves 173. A lower pressure rod 176 is slidably connected to the side of the two U-shaped grooves 173 that are away from each other. The lower pressure rod 176 is T-shaped, and a spring 175 is sleeved on the outside of the lower pressure rod 176; the spring 175 is arranged in the U-shaped groove 173; A transverse pressure rod 177 is welded to the lower end of the downward pressure rod 176 .

[0043] By adopting the above technical solution, after the protective film is cut, the cylinder rod of the double-rod cylinder 22 contracts, causing the hanger 21 to drive 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, and the ball 174 exerts a downward pressure on the lower pressure rod 176, and the horizontal pressure rod 177 provided at the end of the lower pressure rod 176 presses on the pressing cam 1853. At this time, the clamping cam 1853 flips over, and the buckle 1858 located below the clamping cam 1853 is engaged with the clamping column 1855, thereby realizing 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 labor intensity.

[0044] Please see the attached Figure 12 In this embodiment, the first pressing member 185 includes a fixing seat 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 is locked and fixed with the clamping column 1855.

[0045] To be more specific, both ends of the clamping column 1855 are slidably connected in the tilting frame 1854, and a tightening spring 1856 for tightening the clamping column 1855 is provided in the tilting frame 1854; a rubber plate 1857 is also bonded to the upper surface of the fixing seat 1851.

[0046] By adopting the above technical solution, the setting of the rubber plate 1857 allows a certain deflection margin when the buckle 1858 and the clamping column 1855 are clamped and fixed, so that the protective film can be clamped and prevented from falling off during the tensile test.

[0047] In this embodiment, the stretching mechanism 18 is fixed in the sliding seat 20; the sliding seat 20 is mounted in conjunction with the linear drive module 19; the linear drive module 19 is fixed to the base 1 by screws; A bracket 2 for fixing the lateral movement mechanism is also fixed on the base 1 , and a PLC controller 23 is also installed on one side of the bracket 2 .

[0048] To be more specific, the horizontal moving mechanism includes a horizontal slide rail 3 fixed on the inner side of the upper end of the bracket 2, and the vertical moving mechanism is slidably connected to the horizontal slide rail 3; a horizontal driving 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 horizontal driving cylinder 4; the push rod 5 is fixed to the vertical moving mechanism.

[0049] 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 contracts, it can drive the vertical moving mechanism to move along the transverse slide rail 3 through the push rod 5, so that 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.

[0050] In this embodiment, the vertical movement mechanism includes a horizontal slide 6, on which a rotary motor 9 is mounted; a synchronous wheel 10 is mounted on the output shaft of the rotary motor 9, and a synchronous belt 11 is mounted between the synchronous wheel 10 and another synchronous wheel; A clamping block 12 is riveted on one side of the synchronous belt 11, and the clamping block 12 is fixed to the fixed plate 13 by screws; the fixed 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 to one side of the upper end of the fixed plate 13.

[0051] By adopting the above technical solution, when the rotating motor 9 rotates, it can drive the clamping block 12 together with the vertical moving mechanism with the cooperation of the synchronous wheel 10 and the synchronous belt 11, so that the height of the vertical moving mechanism can be adjusted. First, it is to ensure that when the cylinder rod of the double-rod cylinder 22 is extended, the laser cutter 16 can cut the protective film, and when the cylinder rod of the double-rod cylinder 22 is retracted, the cross-pressure rod 177 can be accurately pressed on the clamping cam 1853, and the snap 1858 and the clamping column 1855 can be engaged.

[0052] Furthermore, after the tensile test is completed, the engagement between the buckle 1858 and the column 1855 can be released by manually bending the column 1855 to one side, so that the broken protective film can be removed. The structure is simple and the operation is convenient.

[0053] In this embodiment, the proximity switch 15 is provided to limit the contraction degree of the double-rod cylinder 22 to prevent excessive contraction that causes the transverse pressure rod 177 to excessively press the protective film.

[0054] The PLC controller is used for the logic control of each drive component.

[0055] A method for using a protective film tensile strength testing device comprises the following steps: Step 1: Place the protective film. Place the prepared sample on the protective film adsorption frame 184. The protective film adsorption frame 184 adsorbs the protective film to ensure that the posture of the protective film does not change, thereby facilitating the laser cutting process of the protective film by the laser cutter 16, thereby ensuring that the size of the sample is qualified. Step 2: Cutting the protective film. When the rotary motor 9 rotates, the synchronous wheel 10 and the synchronous belt 11 cooperate to drive the clamping block 12 together with the vertical moving mechanism, so that the height of the vertical moving mechanism can be adjusted. When the double-rod cylinder 22 extends, the laser cutter 16 can cut the protective film. Step three, fixing the protective film. After cutting the protective film, the cylinder rod of the double-rod cylinder 22 contracts, causing the hanger 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 a downward pressure on the lower pressure rod 176. The horizontal pressure rod 177 set at the end of the lower pressure rod 176 presses on the clamping cam 1853; at this time, the clamping cam 1853 flips over, and the buckle 1858 located below the clamping cam 1853 engages with the clamping column 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; Step 4: tensile test of the protective film. The rod of the tensile cylinder 187 is extended. At this time, the first pressing member 185 and the second pressing member 186 move away from each other along the slide rail. 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.

[0056] 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 embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0057] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A protective film tensile strength testing device, characterized in that: The invention comprises a horizontal movement mechanism, on which a vertical movement mechanism is mounted in cooperation; an outer mounting seat (14) is mounted in cooperation on one side of the vertical movement mechanism, two hanging seats (21) are slidably connected to the side where the outer mounting seat (14) is connected to the vertical movement mechanism, and a laser cutter (16) is mounted in cooperation between the two hanging seats (21); the hanging seat (21) is also fixedly connected to the cylinder rod of the double-rod cylinder (22), and the double-rod cylinder (22) is fixed on the inner side of the mounting seat (14); A stretching mechanism (18) is provided below the laser cutter (16); the stretching mechanism (18) comprises a bottom plate (181), and a first pressing member (185) and a second pressing member (186) are respectively fixed above both ends of the bottom plate (181); the first pressing member (185) and the second pressing member (186) are composed of a common structure and are symmetrically arranged; A stretching cylinder (187) is fixed to the inner side of the first holding member (185) via a clamp, and a tension sensor (188) is connected to the end of the cylinder rod of the stretching cylinder (187); 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) comprises a fixing seat (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 clamping column (1855) are clamped and fixed.

3. The protective film tensile strength testing device according to claim 2, characterized in that: The two ends of the clamping column (1855) are slidably connected in the tilting frame (1854), and a tightening spring (1856) for tightening the clamping column (1855) is also provided in the tilting 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 interior of the protective film adsorption frame (184) is hollow, and a plurality of suction holes are provided 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 bottom plate (181); the bottom of the protective film adsorption frame (184) is also provided with a driving frame (182) for controlling the lifting of the protective film adsorption frame (184).

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

6. The protective film tensile strength testing device according to claim 1, characterized in that: A driving assembly (17) is provided above the stretching mechanism (18), and the driving assembly (17) includes an inverted U-shaped groove (173) opened on the outside of the outer mounting seat (14); the ends of the two U-shaped grooves (173) close to each other are movably connected to a top frame (171), and a plurality of balls (174) are evenly distributed in the U-shaped grooves (173); a lower pressure rod (176) is slidably connected in the side of the two U-shaped grooves (173) away from each other, and the lower pressure rod (176) is arranged in a T-shape, and a spring (175) is sleeved on the outside of the lower pressure rod (176); the spring (175) is arranged in the U-shaped groove (173); The lower end of the lower pressure rod (176) is further welded with a transverse pressure rod (177).

7. The protective film tensile strength testing device according to claim 1, characterized in that: The stretching mechanism (18) is fixed in the sliding seat (20); the sliding seat (20) is mounted on the linear drive module (19); the linear drive module (19) is fixed to the base (1) by screws; A bracket (2) for fixing the lateral movement mechanism is also fixed on the base (1), 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 horizontal movement mechanism comprises a horizontal slide rail (3) fixed on the inner side of the upper end of the bracket (2), and a vertical movement mechanism is slidably connected to the horizontal slide rail (3); a horizontal driving cylinder (4) is fixed on the outer side of the bracket (2), and a push rod (5) is fixed to the end of the cylinder rod of the horizontal driving 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 movement mechanism includes a horizontal slide (6), on which a rotating motor (9) is mounted; a synchronous wheel (10) is mounted on the output shaft of the rotating motor (9), and a synchronous belt (11) is mounted between the synchronous wheel (10) and another synchronous wheel; A clamping block (12) is riveted on 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 on the inner side of the transverse slide (6); A proximity switch (15) is also fixed to one side of the upper end of the fixing plate (13).

10. The method for using the protective film tensile strength testing device according to any one of claims 1 to 9, characterized in that: The method includes the following steps: Step 1: Placing the protective film, placing the sample of the protective film on the protective film adsorption frame (184), using the negative pressure generated by the protective film adsorption frame (184) to adsorb the protective film, and then using the 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 driving assembly (17) is activated, so that the first pressing member (185) and the second pressing member (186) press the protective film, and then the cylinder rod of the stretching cylinder (187) is extended. At this time, the first pressing member (185) and the second pressing member (186) move away from each other along the slide rail, and continue to apply pressure 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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