A film layer strength detection device

Abstract

The utility model relates to a kind of film layer strength detection equipment, comprising: support plate, support plate is vertically set and includes first installation surface and second installation surface, connecting rod assembly is installed on support plate, connecting rod assembly includes the drive mechanism being arranged at the second installation surface of support plate, drive mechanism output shaft penetrates support plate and protrudes from the second installation surface of support plate and is connected with runner, runner is connected with connecting plate by first connecting rod, connecting plate is equipped with mounting plate and positioning rod, both ends of positioning rod penetrate support plate and are slidably connected with support plate;In the utility model, positioning rod and support plate are cooperated by the drive mechanism and runner of being set, effectively convert rotary motion into linear motion, so as to effectively drive pencil to make reciprocating linear motion by mechanical structure, the sliding path of positioning rod on support plate strictly limits the swing space of mounting seat, ensure that pencil always moves along preset straight trajectory.

Description

Technical Field

[0001] This utility model relates to the field of membrane strength testing technology, specifically to a membrane strength testing device. Background Technology

[0002] During the lens manufacturing process, in order to improve the brightness and color saturation of the lens image and reduce glare caused by reflection, the lens must be coated at the end. Since the lens itself is not resistant to high temperatures, the coating work is usually carried out at room temperature. However, the adhesion of the coating at room temperature is not good, so the strength of the coating layer needs to be tested after the coating is completed.

[0003] Currently, membrane strength testing mainly uses the pencil scratch method, which involves applying scratches to the membrane surface with a hard pen tip to assess the adhesion level and thus test the adhesion of the membrane. However, in practice, it has been found that it is impossible to maintain a consistent scratching angle and force each time, resulting in inconsistent test results and making it impossible to effectively control the test quality. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a film strength testing device to solve the technical problem that existing testing methods cannot effectively control the angle and force of pencil strokes on the film.

[0005] This utility model discloses a membrane strength testing device, comprising: a support plate, the support plate being vertically arranged and including a first mounting surface and a second mounting surface; a connecting rod assembly mounted on the support plate; the connecting rod assembly including a drive mechanism disposed on the second mounting surface of the support plate; the output shaft of the drive mechanism passing through the support plate and protruding from the first mounting surface of the support plate and connected to a rotating wheel; the rotating wheel being connected to a connecting plate via a first connecting rod; the connecting plate being provided with a mounting plate and a positioning rod; both ends of the positioning rod passing through the support plate and being slidably connected to the support plate.

[0006] An adjustment assembly includes a mounting base connected to the mounting plate and a telescopic mechanism disposed on the mounting base. The output end of the telescopic mechanism is provided with a pencil, and the linkage assembly is used to drive the pencil on the adjustment assembly to perform linear reciprocating motion.

[0007] As a further improvement of this utility model, the linkage assembly further includes a second connecting rod connected to the support plate and a third connecting rod connected to the mounting plate. The connecting plate is rotatably connected to the second connecting rod and the third connecting rod near both ends. The mounting plate and the connecting plate are both vertically arranged and parallel to each other. The upper surface of the mounting plate is connected and fixed to the outer surface of the positioning rod. The first connecting rod is located near the edge of the rotating wheel.

[0008] As a further improvement of this utility model, a strip-shaped opening is provided through the connecting plate, the diameter of the first connecting rod matches the width of the strip-shaped opening and passes through the strip-shaped opening, and both ends of the strip-shaped opening along the length direction are arc-shaped.

[0009] As a further improvement of this utility model, the support plate includes a bottom plate, a side plate, and a top plate. The top plate is located on the top of the support plate and includes two positioning blocks and a horizontal plate. The horizontal plate is connected to the top of the support plate and is perpendicular to the support plate. Both positioning blocks are connected and fixed to the side of the horizontal plate near the mounting plate and are perpendicular to the horizontal plate. Both ends of the positioning rod pass through the two positioning blocks and are slidably connected between the two positioning blocks. Both ends of the positioning rod protrude from the positioning blocks.

[0010] As a further improvement of this utility model, the base plate is fixedly connected to the bottom of the support plate and perpendicular to the support plate. The bottom of the base plate is provided with a moving mechanism. The base plate is fixedly connected to the output end of the moving mechanism. The moving mechanism is used to drive the support plate to reciprocate along the Y-axis.

[0011] As a further improvement of this utility model, there are two side plates, both of which are fixedly connected to the top two sides of the base plate and perpendicular to the base plate. Each of the two side plates includes three side walls, two of which are respectively attached to the support plate and the base plate, and the other side wall is designed in an inclined shape.

[0012] As a further improvement of this utility model, the mounting base includes two mounting parts and one connecting part. The connecting part is located between the two mounting parts. Both mounting parts protrude from the upper surface of the connecting part. The two mounting parts and the connecting part are combined to form a U-shape. The two mounting parts are respectively connected and fixed to the mounting plate and the telescopic mechanism.

[0013] As a further improvement of this utility model, the telescopic mechanism extends downward and is connected to a fixed seat at its telescopic end. A fixed plate is provided on the side of the fixed seat facing away from the telescopic mechanism. One side of the upper surface of the fixed plate is in contact with the bottom surface of the fixed seat, and one side of the fixed plate protrudes from the fixed seat.

[0014] As a further improvement of this utility model, the upper surface of the fixing plate protruding from the fixing seat is provided with a mounting hole in a vertical direction. A pencil is movably inserted into the mounting hole, and both ends of the pencil protrude from the upper and lower surfaces of the fixing plate.

[0015] As a further improvement of this utility model, an adjustment slot communicating with the mounting hole is provided through one side of the fixing plate in a vertical direction. The size of the adjustment slot is 0.5-1mm. A fastening screw is threadedly connected to the outside of the fixing plate in a direction perpendicular to the adjustment slot. The fastening screw and the adjustment slot are used to adjust the size of the mounting hole.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] In this invention, the drive mechanism and rotating wheel, in conjunction with the positioning rod and support plate, effectively convert rotational motion into linear motion. This mechanical structure effectively drives the pencil to perform reciprocating linear motion. The sliding path of the positioning rod on the support plate strictly limits the swing space of the mounting base, ensuring that the pencil always moves along a preset straight trajectory. This physical constraint effectively avoids hand tremors or angular deviations during manual operation. Furthermore, the pressure adjustment via the telescopic mechanism effectively solves the problem of force control. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model from one side;

[0020] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the present invention from the other side;

[0021] Figure 3 This is a schematic diagram of the overall three-dimensional rear view structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the overall side view structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the overall front view of the present invention;

[0024] Figure 6 This is a top view of the overall structure of this utility model;

[0025] Figure 7 This utility model Figure 4 A magnified structural diagram at point A.

[0026] In the diagram: 1. Support plate; 11. Base plate; 12. Side plate; 13. Top plate; 14. First mounting surface; 15. Second mounting surface; 131. Positioning block; 132. Horizontal plate; 2. Linkage assembly; 21. Drive mechanism; 22. Connecting plate; 23. Third connecting rod; 24. Mounting plate; 25. Positioning rod; 26. Rotary wheel; 27. Second connecting rod; 221. Strip opening; 261. First connecting rod; 3. Adjustment assembly; 31. Mounting seat; 32. Telescopic mechanism; 33. Fixed seat; 331. Fixed plate; 332. Pencil; 333. Mounting hole; 334. Adjustment gap; 311. Connecting part; 312. Mounting part; 4. Moving mechanism. Detailed Implementation

[0027] The following illustrations will reveal several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in a simple schematic manner in the illustrations.

[0028] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this technology, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0030] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] Please see Figure 1-7This utility model discloses a film strength testing device (this utility model includes, but is not limited to, testing lenses, and can also test the strength of coatings on the surface of molds such as mold cores). It includes: a support plate 1, which is vertically arranged and includes a first mounting surface 14 and a second mounting surface 15. A connecting rod assembly 2 is mounted on the support plate 1. The connecting rod assembly 2 includes a drive mechanism 21 disposed on the second mounting surface 15 of the support plate 1. The output shaft of the drive mechanism 21 passes through the support plate 1 and protrudes from the first mounting surface 14 of the support plate 1 and is connected to a rotating wheel 26. The rotating wheel 26 is connected to a connecting plate 22 through a first connecting rod 261. The connecting plate 22 is provided with a mounting plate 24 and a positioning rod 25. Both ends of the positioning rod 25 pass through the support plate 1 and are slidably connected to the support plate 1.

[0032] Adjustment component 3 includes a mounting base 31 connected to mounting plate 24, and a telescopic mechanism 32 provided on mounting base 31. The output end of telescopic mechanism 32 is provided with pencil 332. Linkage component 2 is used to drive pencil 332 on adjustment component 3 to perform linear reciprocating motion.

[0033] In this embodiment, the drive mechanism 21 can be a servo motor, stepper motor, or geared motor, etc., and its output shaft can transmit torque to the wheel 26 through a coupling or keyway structure. The telescopic mechanism 32 can be a linear motion device such as an electric push rod, pneumatic cylinder, or linear motor. The positioning rod 25 can be a chrome-plated optical shaft, linear guide rail, or guide rod mechanism;

[0034] The drive mechanism 21 is bolted to the second mounting surface 15 of the support plate 1. Its output shaft passes through the through hole of the support plate 1 and is connected to the rotating wheel 26 via a flat key. The rotating wheel 26 is hinged to the first connecting rod 261 at an eccentric position via a pin, forming a crank-slider mechanism. The connecting plate 22 and the mounting plate 24 are connected as a whole by welding or bolting. The positioning rod 25 passes through the guide holes of the support plate 1 at both ends and is fixed in stroke by limit nuts. The mounting base 31 and the mounting plate 24 are connected by T-slot bolts to achieve three-dimensional adjustment. The cylinder of the telescopic mechanism 32 is mounted on the mounting base 31 via a flange.

[0035] The linkage assembly 2 is used to drive the pencil 332 on the adjustment assembly 3 to perform linear reciprocating motion. This means that when the rotating wheel 26 rotates, it drives the connecting plate 22 to perform linear reciprocating motion through the first connecting rod 261, thereby causing the entire adjustment assembly 3 and the pencil 332 at its end to produce periodic linear motion parallel to the support plate 1. This motion trajectory maintains a constant contact pressure with the film surface. The positioning rod 25 passes through the support plate 1 at both ends and is slidably connected to the support plate 1, which means that the positioning rod 25 is both a motion guide component and a force-bearing support component. Its double-point support structure can effectively prevent the connecting plate 22 from generating a deflection torque when it moves.

[0036] Compared to traditional manual inspection, this design offers advantages in terms of high standardization and repeatability. The double-sided support plate 1 structure ensures the installation stability of the drive mechanism 21 and provides symmetrical force support for the adjustment component 3, significantly improving the smoothness of the inspection process and the accuracy of the data compared to a single-sided cantilever structure.

[0037] Please see Figure 1 and Figure 7 In this embodiment, the linkage assembly 2 further includes a second connecting rod 27 connected to the support plate 1 and a third connecting rod 23 connected to the mounting plate 24. The connecting plate 22 is rotatably connected to the second connecting rod 27 and the third connecting rod 23 near both ends. The mounting plate 24 and the connecting plate 22 are both vertically arranged and parallel to each other. The upper surface of the mounting plate 24 is connected and fixed to the outer surface of the positioning rod 25. The first connecting rod 261 is located near the edge of the rotating wheel 26.

[0038] The second connecting rod 27 and the third connecting rod 23 can be rigid connecting parts such as metal rods, carbon fiber rods, or engineering plastic rods, and their ends can be equipped with rotating connection structures such as spherical bearings, ball joint connectors, or pins. The mounting plate 24 can be a rigid plate such as an aluminum alloy plate, steel plate, or engineering plastic plate, and its connection with the positioning rod 25 can be welding, bolting, or interference fit. The position of the rotating wheel 26 near the edge refers to the mounting hole 333 on the circumference of the rotating wheel 26 that is offset from the center by a certain distance. This eccentricity determines the swing amplitude of the first connecting rod 261.

[0039] The connecting plate 22 is rotatably connected to the second connecting rod 27 and the third connecting rod 23 near its two ends, meaning that each end of the connecting plate 22 has a fulcrum, forming a double rocker mechanism. This layout makes the movement trajectory of the connecting plate 22 more stable. The mounting plate 24 and the connecting plate 22 are both vertical and parallel to each other, indicating that they maintain a vertical state and a constant distance, ensuring that the pencil 332 is always perpendicular to the film surface being measured during movement.

[0040] A strip-shaped opening 221 is provided through the connecting plate 22. The diameter of the first connecting rod 261 matches the width of the strip-shaped opening 221 and passes through the strip-shaped opening 221. Both ends of the strip-shaped opening 221 are arc-shaped along the length direction. This design allows the first connecting rod 261 to have a reserved moving position on the connecting plate 22 when it rotates through the rotating wheel 26, so as to better drive the connecting plate 22 to swing arm movement.

[0041] The support plate 1 includes a bottom plate 11, a side plate 12, and a top plate 13. The top plate 13 is located on the top of the support plate 1. The top plate 13 includes two positioning blocks 131 and a horizontal plate 132. The horizontal plate 132 is connected to the top of the support plate 1 and is perpendicular to the support plate 1. The two positioning blocks 131 are both connected and fixed to the side of the horizontal plate 132 near the mounting plate 24 and are perpendicular to the horizontal plate 132. The two ends of the positioning rod 25 pass through the two positioning blocks 131 and are slidably connected between the two positioning blocks 131. The two ends of the positioning rod 25 protrude from the positioning blocks 131.

[0042] The base plate 11, side plates 12, and top plate 13 are all components of the support plate 1 and can be made of rigid materials such as steel plates, aluminum alloy plates, or engineering plastic plates. The base plate 11 and side plates 12 provide basic support, while the top plate 13 provides guidance. The positioning block 131 can be a guide component made of wear-resistant materials such as cast iron blocks, copper alloy blocks, or nylon blocks, and has internally machined linear bearing holes or self-lubricating bushings. The horizontal plate 132 serves as a connecting component and can adopt a T-shaped, L-shaped, or flat plate structure.

[0043] The horizontal plate 132 is vertically fixed to the top of the support plate 1 by welding, bolting, or integral casting to form a T-shaped support structure. Two positioning blocks 131 are symmetrically distributed on the side of the horizontal plate 132 facing the mounting plate 24, and are fastened to the horizontal plate 132 by countersunk screws, welding, or dovetail grooves. The positioning rod 25 passes through the guide hole machined in the positioning block 131.

[0044] Both positioning blocks 131 are connected and fixed to the side of the horizontal plate 132 near the mounting plate 24 and are perpendicular to the horizontal plate 132. This indicates that the positioning blocks 131 not only provide a guiding function but also serve as force-bearing support points. Their vertical arrangement ensures that the movement direction of the positioning rod 25 is parallel to the plane of the support plate 1. The design of both ends of the positioning rod 25 protruding from the positioning blocks 131 facilitates the installation of limiting devices and allows observation of the movement stroke through the protruding parts. Through the combined design of the top plate 13, the horizontal plate 132, and the positioning blocks 131, a stable dual-point guiding system is constructed. Compared with the single-point support scheme, this effectively suppresses the swaying phenomenon of the positioning rod 25 during movement and improves the straightness accuracy of the pencil 332 scratch. The vertical fixing method of the positioning blocks 131 to the horizontal plate 132 enhances the structural rigidity and makes the pressure distribution of the pencil 332 more uniform during the testing process.

[0045] The base plate 11 is fixedly connected to the bottom of the support plate 1 and is perpendicular to the support plate 1. The bottom of the base plate 11 is provided with a moving mechanism 4. The base plate 11 is fixedly connected to the output end of the moving mechanism 4. The moving mechanism 4 is used to drive the support plate 1 to reciprocate along the Y-axis.

[0046] The base plate 11, serving as the fundamental load-bearing component of the support plate 1, can be made of materials such as cast iron, welded steel structures, or aluminum alloy profiles. In this embodiment, the moving mechanism 4 can be a linear motion device such as a ball screw module, a linear motor module, or a belt drive mechanism, and its drive source can be a servo motor, stepper motor, or linear motor. The Y-axis reciprocating motion refers to movement along the horizontal direction perpendicular to the plane of the support plate 1 in the equipment coordinate system; this direction is typically consistent with the length direction of the film being measured.

[0047] There are two side plates 12, both of which are fixedly connected to the top two sides of the base plate 11 and perpendicular to the base plate 11. Each side plate 12 includes three side walls, two of which are attached to the support plate 1 and the base plate 11 respectively, and the other side wall is designed in an inclined shape, which makes the structure of the support plate 1 more stable.

[0048] Please see Figure 1 and Figure 2 It should be noted that the mounting base 31 includes two mounting parts 312 and one connecting part 311. The connecting part 311 is located between the two mounting parts 312. Both mounting parts 312 protrude from the upper surface of the connecting part 311. The two mounting parts 312 and the connecting part 311 are combined to form a U-shape. The two mounting parts 312 are respectively connected and fixed to the mounting plate 24 and the telescopic mechanism 32.

[0049] The mounting part 312 can be made of aluminum alloy castings, steel plate bending parts, or engineering plastic injection molded parts. The connecting part 311, as a transition part of the mounting base 31, can be integrally formed with the mounting part 312 or a separate design connected by welding or bolts.

[0050] The telescopic mechanism 32 extends downwards and is connected to a fixed seat 33 at its telescopic end. A fixed plate 331 is provided on the side of the fixed seat 33 facing away from the telescopic mechanism 32. One side of the upper surface of the fixed plate 331 is in contact with the bottom surface of the fixed seat 33, and one side of the fixed plate 331 protrudes from the fixed seat 33.

[0051] The upper surface of the fixing plate 331 protruding from the fixing base 33 has a vertically penetrating mounting hole 333. A pencil 332 is movably inserted into the mounting hole 333, with both ends of the pencil 332 protruding from the upper and lower surfaces of the fixing plate 331.

[0052] A vertical adjustment slot 334 is provided on one side of the fixing plate 331, which communicates with the mounting hole 333. The size of the adjustment slot 334 is 0.5-1mm. A fastening screw is threaded to the outside of the fixing plate 331 along the direction perpendicular to the adjustment slot 334. The fastening screw and the adjustment slot 334 are used to adjust the size of the mounting hole 333.

[0053] The fixing plate 331 can be made of materials such as 45# steel, aluminum alloy, or stainless steel, with a thickness of 3-8mm to ensure sufficient structural strength. The adjusting slot 334 is a slender opening perpendicular to the fixing plate 331, with a width of 0.5-1mm, ensuring adjustment accuracy while avoiding excessive weakening of the fixing plate 331's strength. The fastening screw can be an M4-M6 standard threaded rod, preferably made of stainless steel or chrome-plated carbon steel, with its thread specification matching the threaded holes machined on the fixing plate 331. The mounting hole 333 is typically a circular through hole, with a diameter designed to be 5-12mm depending on the size of the fastened component.

[0054] The adjusting joint 334 is machined through one side of the fixing plate 331 by wire cutting or milling and connects with the mounting hole 333, forming an elastic deformation area. The fastening screw is screwed into a threaded hole machined on the outside of the fixing plate 331, with its axis perpendicular to the extension direction of the adjusting joint 334. When the fastening screw is tightened, the end of the screw presses against both sides of the adjusting joint 334, causing elastic deformation and thus changing the actual diameter of the mounting hole 333. Stress relief holes can be machined at the end of the adjusting joint 334 to prevent crack propagation.

[0055] The fastening screw and adjusting slot 334 are used to adjust the size of the mounting hole 333 by tightening the fastening screw, causing the two sides of the adjusting slot 334 to move in opposite directions, thereby reducing the actual effective diameter of the mounting hole 333. The direction perpendicular to the adjusting slot 334 specifically refers to the fastening screw's axis forming a 90° angle with the length of the adjusting slot 334. This arrangement ensures that the screw pressure is effectively converted into the closing deformation of the adjusting slot 334. The 0.5-1mm width of the adjusting slot 334 ensures adjustment sensitivity while avoiding excessive reduction in the rigidity of the fixing plate 331.

[0056] When membrane strength needs to be tested, first insert the sharpened pencil 332, tip down, into the mounting hole 333. Then tighten the fastening screw to cause the adjusting slot 334 to contract, thereby causing the mounting hole 333 to contract and fix the pencil 332. Next, start the moving mechanism 4 to move the tip of the pencil 332 to the position in contact with the membrane layer. Adjust the contact force or depth between the tip of the pencil 332 and the membrane layer by raising and lowering the telescopic mechanism 32. After adjustment, start the drive mechanism 21 to drive the rotating wheel 26 to rotate, thereby driving the first connecting rod 26 on the rotating wheel 26. 1. When rotating, the first connecting rod 261 is inserted into the slot 221 on the connecting plate 22, causing the connecting plate 22 to reciprocate around the third connecting rod 23 as the axis. This causes the mounting plate 24 to drive the positioning rod 25 to move back and forth laterally. The positioning rod 25 is limited by the positioning block 131, causing it to move back and forth horizontally. This causes the mounting base 31 connected to the mounting plate 24 to move back and forth horizontally, so that the fixed base 33 and the telescopic mechanism 32 together drive the pencil 332 to move back and forth horizontally, thus realizing the detection of membrane strength.

[0057] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A membrane strength testing device, characterized in that, include: A support plate (1) is vertically arranged and includes a first mounting surface (14) and a second mounting surface (15). A connecting rod assembly (2) is mounted on the support plate (1). The connecting rod assembly (2) includes a drive mechanism (21) located on the second mounting surface (15) of the support plate (1). The output shaft of the drive mechanism (21) passes through the support plate (1) and protrudes from the first mounting surface (14) of the support plate (1) and is connected to a rotating wheel (26). The rotating wheel (26) is connected to a connecting plate (22) via a first connecting rod (261). The connecting plate (22) is provided with a mounting plate (24) and a positioning rod (25). Both ends of the positioning rod (25) pass through the support plate (1) and are slidably connected to the support plate (1). Adjustment component (3), the adjustment component (3) includes a mounting base (31) connected to the mounting plate (24), and a telescopic mechanism (32) provided on the mounting base (31). The output end of the telescopic mechanism (32) is provided with a pencil (332). The linkage assembly (2) is used to drive the pencil (332) on the adjustment component (3) to perform linear reciprocating motion.

2. The membrane strength testing device according to claim 1, characterized in that: The linkage assembly (2) further includes a second connecting rod (27) connected to the support plate (1) and a third connecting rod (23) connected to the mounting plate (24). The connecting plate (22) is rotatably connected to the second connecting rod (27) and the third connecting rod (23) near both ends. The mounting plate (24) and the connecting plate (22) are both vertically arranged and parallel to each other. The upper surface of the mounting plate (24) is connected and fixed to the outer surface of the positioning rod (25). The first connecting rod (261) is located near the edge of the rotating wheel (26).

3. The membrane strength testing device according to claim 2, characterized in that: The connecting plate (22) has a through slot (221) through it. The diameter of the first connecting rod (261) matches the width of the slot (221) and passes through the slot (221). Both ends of the slot (221) are arc-shaped along the length direction.

4. The membrane strength testing device according to claim 2, characterized in that: The support plate (1) includes a bottom plate (11), a side plate (12), and a top plate (13). The top plate (13) is located on the top of the support plate (1). The top plate (13) includes two positioning blocks (131) and a horizontal plate (132). The horizontal plate (132) is connected to the top of the support plate (1) and is perpendicular to the support plate (1). The two positioning blocks (131) are both connected and fixed to the side of the horizontal plate (132) near the mounting plate (24) and are perpendicular to the horizontal plate (132). The two ends of the positioning rod (25) pass through the two positioning blocks (131) and are slidably connected between the two positioning blocks (131). The two ends of the positioning rod (25) protrude from the positioning blocks (131).

5. The membrane strength testing device according to claim 4, characterized in that: The base plate (11) is fixedly connected to the bottom of the support plate (1) and perpendicular to the support plate (1). The bottom of the base plate (11) is provided with a moving mechanism (4). The base plate (11) is fixedly connected to the output end of the moving mechanism (4). The moving mechanism (4) is used to drive the support plate (1) to reciprocate along the Y-axis.

6. The membrane strength testing device according to claim 4, characterized in that: There are two side plates (12), both of which are fixedly connected to the top two sides of the bottom plate (11) and perpendicular to the bottom plate (11). Both side plates (12) include three side walls, two of which are attached to the support plate (1) and the bottom plate (11) respectively, and the other side wall is designed in an inclined shape.

7. The membrane strength testing device according to claim 1, characterized in that: The mounting base (31) includes two mounting parts (312) and a connecting part (311). The connecting part (311) is located between the two mounting parts (312). Both mounting parts (312) protrude from the upper surface of the connecting part (311). The two mounting parts (312) and the connecting part (311) are combined to form a U-shape. The two mounting parts (312) are respectively connected and fixed to the mounting plate (24) and the telescopic mechanism (32).

8. The membrane strength testing device according to claim 7, characterized in that: The telescopic mechanism (32) extends downward and is connected to a fixed seat (33) at its telescopic end. A fixed plate (331) is provided on the side of the fixed seat (33) facing away from the telescopic mechanism (32). One side of the upper surface of the fixed plate (331) is in contact with the bottom surface of the fixed seat (33), and one side of the fixed plate (331) protrudes from the fixed seat (33).

9. The membrane strength testing device according to claim 8, characterized in that: The fixing plate (331) has a mounting hole (333) extending vertically through the upper surface of the fixing seat (33) on one side. A pencil (332) is movably inserted into the mounting hole (333). Both ends of the pencil (332) protrude from the upper and lower surfaces of the fixing plate (331).

10. The membrane strength testing device according to claim 9, characterized in that: The fixing plate (331) has an adjustment slot (334) that communicates with the mounting hole (333) through a vertical direction on one side. The size of the adjustment slot (334) is 0.5-1mm. A fastening screw is threaded to the outside of the fixing plate (331) in a direction perpendicular to the adjustment slot (334). The fastening screw and the adjustment slot (334) are used to adjust the size of the mounting hole (333).

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