A slip-proof sample clamping mechanism for tension test

Abstract

The utility model relates to tension test technical field, the utility model provides a sample clamping mechanism for preventing slipping for tension test, it includes hollow base, the bottom four corners of hollow base all are fixedly connected with support leg, the front side fixedly connected with controller of hollow base, multidimensional adaptive clamping subassembly, multidimensional adaptive clamping subassembly sets up in the top middle part of hollow base, lifting guard board subassembly, lifting guard board subassembly sets up in the inside of hollow base. Through the above technical scheme, the single direction clamping of prior art is often used, the sample is easy to slip along the unclamped direction in the tension test, and simultaneously lacks adaptive adjusting function, the clamping strength cannot be adjusted according to the sample characteristic, and the test data accuracy is influenced, lacks the guard board barrier, and the fragments produced by the sample fracture can directly splash to all around, and the safety of the technical problem of testing environment is seriously threatened.

Description

Technical Field

[0001] This utility model relates to the field of tensile testing technology, specifically to an anti-slip sample clamping mechanism for tensile testing. Background Technology

[0002] In the field of tensile testing, the sample clamping mechanism is a core component ensuring the accuracy and stability of the test. Its design must be adaptable to specimens of different materials, shapes, and stress levels. In existing technologies, clamping mechanisms are typically classified into various types based on their locking principles, such as wedge-shaped, clamping, and winding, to meet the clamping needs of different specimens, from filaments to tubes. To achieve anti-slip effects, existing solutions often employ composite designs, such as adding anti-slip pads, spraying with diamond abrasive, or using toothed structures to enhance friction on the clamping contact surfaces. Some mechanisms improve clamping reliability through wedge self-locking or spring pre-tensioning structures. Simultaneously, the clamping body is often made of high-strength materials such as alloy structural steel, and some are equipped with anti-corrosion coatings, making them adaptable to various testing environments and providing basic clamping assurance for tensile testing.

[0003] In existing technologies, clamping is often performed in a single direction (such as only horizontal or only vertical). During tensile testing, the sample is prone to slipping out along the unclamped direction. This not only forces the test to be interrupted but may also cause safety hazards due to the sample popping out, wasting test time and sample materials. At the same time, without adaptive adjustment functions, the clamping force cannot be adjusted according to the characteristics of the sample. A fixed high force will cause the sample to be pinched and deformed, while a fixed low force cannot provide sufficient friction, which will easily lead to loose clamping and affect the accuracy of test data. In addition, in existing technologies, without protective barriers, fragments generated by sample breakage will fly directly in all directions. If the operator does not avoid them in time, the fragments may cut the hands, face, and other parts of the body, seriously threatening the safety of the testing environment. Utility Model Content

[0004] To overcome the above-mentioned defects, this utility model provides an anti-slip sample clamping mechanism for tensile testing. It solves the technical problems of existing technologies that often use single-direction clamping (such as only horizontal or only vertical), which makes the sample easy to slip off along the unclamped direction during tensile testing. At the same time, it lacks adaptive adjustment function, and the clamping force cannot be adjusted according to the sample characteristics, affecting the accuracy of test data. Furthermore, it lacks a protective plate barrier, so the fragments generated by sample breakage will directly fly in all directions, seriously threatening the safety of the testing environment.

[0005] According to one aspect, at least one embodiment of the present invention provides an anti-slip sample clamping mechanism for tensile testing, comprising: A hollow base, with four fixed feet at the bottom corners, a controller fixedly connected to the front side of the hollow base, an L-shaped fixing plate fixedly connected to the top rear of the hollow base, a tensile testing machine fixedly connected to the inner top wall of the L-shaped fixing plate, and a sliding groove opened on the top of the hollow base. A multi-dimensional adaptive clamping component is provided, which is located at the top center of the hollow base. The multi-dimensional adaptive clamping component is used to clamp the sample in two dimensions, horizontal and vertical, and the clamping force can be dynamically adjusted. A lifting protective plate assembly is disposed inside a hollow base and is used to lift and lower the protective plate.

[0006] For example, in at least one embodiment of the present invention, a sample clamping mechanism for tensile testing is provided, wherein a protective plate is slidably connected to the inner wall of the groove, and an observation window is provided on the front side of the protective plate.

[0007] For example, in at least one embodiment of this utility model, an anti-slip sample clamping mechanism for tensile testing is provided, wherein the multi-dimensional adaptive clamping component includes a fixed frame, the fixed frame is fixedly connected to the top of a hollow base, a hollow clamping frame is fixedly connected to the top of the fixed frame, a motor is fixedly connected to the bottom of the hollow clamping frame, lead screws are rotatably connected to the upper and lower inner walls of the hollow clamping frame, the output shaft of the motor passes through the interior of the hollow clamping frame and is fixedly connected to the lead screws, slide rods are provided on both the left and right sides of the lead screws and are fixedly connected to the inner walls of the hollow clamping frame, and lifting plates are threadedly connected to the outer walls of the two slide rods.

[0008] For example, in at least one embodiment of this utility model, an anti-slip sample clamping mechanism for tensile testing is provided, with connecting rods rotatably connected to both sides of the lifting plate, and first rotating rods rotatably connected to the ends of the two connecting rods away from the lifting plate. First clamping blocks are fixedly connected to the tops of the two first rotating rods, which have an inverted L-shaped structure for clamping the top of the sample. Two symmetrically fixed rods are rotatably connected to the inner walls of the front and rear sides of the hollow clamping frame. The two first rotating rods are rotatably connected to the front sides of the outer walls of the two fixed rods, and second rotating rods are rotatably connected to the rear sides of the outer walls of the two fixed rods. The bottoms of the two second rotating rods are rotatably connected to the two connecting rods, and second clamping blocks are fixedly connected to the tops of the two second rotating rods.

[0009] For example, in at least one embodiment of this utility model, a sample clamping mechanism for tensile testing is provided, in which pressure sensors are fixedly connected to the side of the left and right first clamping blocks and the left and right second clamping blocks near the sample, and toothed silicone anti-slip pads are fixedly connected to the side of the left and right pressure sensors near the sample, and the controller is electrically connected to the motor and the pressure sensors respectively.

[0010] For example, in at least one embodiment of this utility model, an anti-slip sample clamping mechanism for tensile testing is provided, wherein the lifting protective plate assembly includes a rectangular plate, the top of the rectangular plate is fixedly connected to the protective plate, and the bottom of the rectangular plate is fixedly connected to two horizontal bars that are symmetrical from left to right and run in a front-back direction. The rear ends of the two horizontal bars are rotatably connected to X-shaped connecting rods, and the bottom rear of the two X-shaped connecting rods are rotatably connected to a horizontal plate that is fixedly connected to the inner bottom wall of the hollow base.

[0011] For example, in at least one embodiment of the present invention, an anti-slip sample clamping mechanism for tensile testing is provided, wherein rolling grooves are provided on the side walls of the two horizontal bars I on the left and right, and rollers I that are rotatably connected to the front top of the X-shaped connecting rod are movably connected inside the two rolling grooves I. Rolling grooves II are provided on the side walls of the two horizontal plates II on the left and right, and rollers II that are rotatably connected to the front bottom of the X-shaped connecting rod are movably connected inside the two rolling grooves II.

[0012] For example, in at least one embodiment of this utility model, an anti-slip sample clamping mechanism for tensile testing is provided, where two connecting rods arranged in front and behind are rotatably connected above the opposite surfaces of the left and right X-shaped connecting rods. A fixing block is fixedly connected to the top of each of the two connecting rods. A screw is rotatably connected to the front side of the rear fixing block. A limit block is fixedly connected to the front side of the screw. The outer wall of the screw is threadedly connected to a threaded hole opened inside the front fixing block. A second motor is fixedly connected to the rear side wall of the rear fixing block. The output shaft of the second motor passes through the front side wall of the rear fixing block and is fixedly connected to the screw. The controller is electrically connected to the second motor.

[0013] The beneficial effects of the embodiments of this utility model are as follows: In this invention, the multi-dimensional adaptive clamping component can simultaneously clamp the sample from both horizontal and vertical directions, forming a "two-way locking" effect. This prevents the sample from slipping in a single direction, ensuring that the sample remains in a stable clamping state throughout the test, thus providing a foundation for the accuracy of tensile force data. Simultaneously, the pressure sensor equipped with this component can monitor the pressure of the clamping block on the sample in real time. After the data is fed back to the controller, the clamping force can be dynamically adjusted via the drive component. This balances clamping reliability with protecting the original shape of the sample, preventing improper clamping from affecting the test results. The lifting protective plate component can drive the protective plate to a closed state, forming a protective barrier around the clamping mechanism and the sample. This effectively blocks broken fragments from flying outwards, preventing them from scratching operators or damaging surrounding equipment. Especially for samples with high hardness such as metals and glass fibers, this significantly reduces the probability of safety accidents. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure in one embodiment of the present invention; Figure 2 This is a structural schematic diagram of the present invention from an isometric perspective; Figure 3 This is a schematic diagram of the structure of the multi-dimensional adaptive clamping component of this utility model; Figure 4 This is a schematic diagram of the internal structure of the multi-dimensional adaptive clamping component of this utility model; Figure 5 This is a schematic diagram of the structure of the lifting protective plate assembly of this utility model; Figure 6 This is another structural schematic diagram of the lifting protective plate assembly of this utility model.

[0016] In the diagram: 1. Hollow base; 10. Support leg; 11. Controller; 12. L-shaped fixing plate; 13. Tensile testing machine; 14. Slide groove; 15. Protective plate; 16. Observation window; 2. Multi-dimensional adaptive clamping assembly; 20. Fixing frame; 21. Hollow clamping frame; 22. Motor 1; 23. Lead screw; 24. Slide rod; 25. Lifting plate; 26. Connecting rod; 27. First rotating rod; 28. First clamping block; 29. 210. Second rotating rod; 211. Second clamping block; 212. Pressure sensor; 213. Toothed silicone anti-slip pad; 214. Fixing rod; 35. Lifting protective plate assembly; 36. Rectangular plate; 37. Crossbar one; 38. X-shaped connecting rod; 39. Crossbar two; 30. Rolling groove one; 310. Roller one; 311. Connecting rod; 32. Fixing block; 33. Screw; 34. Motor two; 35. Rolling groove two; 36. Roller two. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0018] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] like Figures 1-4 As shown, it illustrates an anti-slip sample clamping mechanism for tensile testing according to an embodiment of the present invention, comprising: Hollow base 1, with four fixed feet 10 at the bottom corners of hollow base 1, controller 11 fixedly connected to the front side of hollow base 1, L-shaped fixing plate 12 fixedly connected to the top rear of hollow base 1, tensile testing machine 13 fixedly connected to the inner top wall of L-shaped fixing plate 12, and a sliding groove 14 opened on the top of hollow base 1. Multi-dimensional adaptive clamping component 2 is set at the top center of the hollow base 1. The multi-dimensional adaptive clamping component 2 is used to clamp the sample in two dimensions, horizontal and vertical, and the clamping force can be dynamically adjusted. The lifting protective plate assembly 3 is located inside the hollow base 1 and is used to lift the protective plate 15.

[0024] A protective plate 15 is slidably connected to the inner wall of the slide 14, and an observation window 16 is provided on the front side of the protective plate 15.

[0025] In some examples, the hollow base 1 is welded from carbon steel, with an overall hollow structure, providing high-strength support. Each of the four corners of the hollow base 1 is bolted to support legs 10, which are made of rubber-coated stainless steel to prevent slippage during testing and reduce vibration and noise during operation. The controller 11 is a PLCS7-1200 programmable logic controller with an integrated touchscreen display and physical operation buttons, used for automated control of the components and display of test data. The tensile testing machine 13 (model HT-101PT) is a conventional electronic tensile testing device, electrically connected to the controller 11, used to provide the required tensile force for testing and record it. The tensile data shows that the protective plate 15 is made of transparent polycarbonate, which has high strength and impact resistance, and can prevent the sample from breaking and splashing during the test, thus preventing safety hazards. An observation window 16 is embedded and fixed in the middle of the front side of the protective plate 15. The observation window 16 is made of double-layer tempered glass, which makes it easy for operators to observe the internal test status. The multi-dimensional adaptive clamping component 2 is set at the top center of the hollow base 1, which is used to clamp the sample in both horizontal and vertical directions. It can also dynamically adjust the clamping force through pressure feedback to avoid sample slippage or damage from excessive clamping. The lifting protective plate component 3 is set inside the hollow base 1 and is used to drive the protective plate 15 to rise and fall along the slide 14, realizing the switching between sample placement before the test and safety protection during the test.

[0026] The multi-dimensional adaptive clamping assembly 2 includes a fixed frame 20, which is fixedly connected to the top of the hollow base 1. A hollow clamping frame 21 is fixedly connected to the top of the fixed frame 20. A motor 22 is fixedly connected to the bottom of the hollow clamping frame 21. Lead screws 23 are rotatably connected to the inner walls of the upper and lower sides of the hollow clamping frame 21. The output shaft of the motor 22 passes through the interior of the hollow clamping frame 21 and is fixedly connected to the lead screw 23. Slide rods 24 are provided on both the left and right sides of the lead screw 23 and are fixedly connected to the inner walls of the hollow clamping frame 21. Lifting plates 25 are threadedly connected to the outer walls of the two slide rods 24.

[0027] Both sides of the lifting plate 25 are rotatably connected to connecting rods 26. The ends of the two connecting rods 26 away from the lifting plate 25 are rotatably connected to first rotating rods 27. The tops of the two first rotating rods 27 are fixedly connected to first clamping blocks 28. The first clamping blocks 28 have an inverted L-shaped structure for clamping the top of the sample. The inner walls of the front and rear sides of the hollow clamping frame 21 are rotatably connected to two left and right symmetrical fixing rods 213. The two first rotating rods 27 are rotatably connected to the front side of the outer wall of the two fixing rods 213 respectively. The rear side of the outer wall of the two fixing rods 213 is rotatably connected to second rotating rods 29. The bottoms of the two second rotating rods 29 are rotatably connected to the two connecting rods 26 respectively. The tops of the two second rotating rods 29 are fixedly connected to second clamping blocks 210.

[0028] Pressure sensors 211 are fixedly connected to the side of each of the two first clamping blocks 28 and the two second clamping blocks 210 near the sample. Toothed silicone anti-slip pads 212 are fixedly connected to the side of each of the two pressure sensors 211 near the sample. The controller 11 is electrically connected to the motor 22 and the pressure sensors 211 respectively.

[0029] In some examples, the hollow clamping frame 21 is a rectangular hollow structure made of stainless steel, used to house the clamping transmission components. The motor 22 is a two-phase stepper motor of model 57HS22, which has high-precision speed and position control performance and can accurately adjust the output shaft rotation through pulse signals. The upper and lower inner walls of the hollow clamping frame 21 are rotatably connected to the lead screw 23 through deep groove ball bearings. The surface is machined with trapezoidal threads. The outer wall of the lead screw 23 is threaded to the lifting plate 25. The left and right sides of the lifting plate 25 have sliding holes that are adapted to the slide rods 24. The lifting plate 25 is slidably connected to the outer wall of the two slide rods 24 through the sliding holes to ensure that the lifting plate 25 rises and falls smoothly along the axial direction of the lead screw 23 and avoids rotational deviation. The left and right sides of the lifting plate 25 are rotatably connected to the connecting rods 26 through pins. The ends of the left and right connecting rods 26 away from the lifting plate 25 are rotatably connected to the first rotating rod through pins. 27. The first clamping block 28 has an inverted L-shaped structure and is made of hard alloy. It is used to clamp the top edge of the sample vertically. The inner walls of the front and rear sides of the hollow clamping frame 21 are rotatably connected by bearings to two symmetrically arranged fixed rods 213. The two first rotating rods 27 are rotatably connected to the front side of the outer wall of the two fixed rods 213 by bushings, so that the first rotating rods 27 can rotate around the fixed rods 213. The rear side of the outer wall of the two fixed rods 213 is rotatably connected to the second rotating rods 29 by bushings. The bottom of the two second rotating rods 29 is rotatably connected to the two connecting rods 26 by pins. The top of the two second rotating rods 29 is fixedly connected to the second clamping block 210 by welding. The second clamping block 210 is a rectangular hard alloy block used to clamp the horizontal side of the sample. It cooperates with the first clamping block 28 to form a two-dimensional clamping. In some examples, pressure sensors 211 are fixedly connected to the sample side of the two first clamping blocks 28 and the two second clamping blocks 210 on the left and right sides by screws. The pressure sensors 211 are miniature piezoresistive pressure sensors of model LCM302, used to monitor the clamping force of the clamping blocks on the sample in real time. Toothed silicone anti-slip pads 212 are fixedly connected to the sample side of the two pressure sensors 211 on the left and right sides. The toothed silicone anti-slip pads 212 have diamond-shaped teeth on their surface, which can increase the friction with the sample surface and prevent scratching the sample surface during clamping. The signal input terminal of the controller 11 is connected to the pressure sensor 211 through a wire, and the signal output terminal is connected to the motor 22 through a wire. According to the pressure data fed back by the pressure sensor 211, the controller can automatically adjust the rotation direction and angle of the motor 22, thereby dynamically adjusting the clamping force to ensure that the clamping force is within the optimal range of not slipping or damaging the sample.

[0030] When a sample needs to be clamped, the operator places the sample to be tested on top of the hollow clamping frame 21 of the multi-dimensional adaptive clamping assembly 2, ensuring that the top edge of the sample corresponds to the first clamping block 28 and the side corresponds to the second clamping block 210. Then, the controller 11 starts the motor 22. The output shaft of the motor 22 drives the lead screw 23 inside the hollow clamping frame 21 to rotate. Since the lifting plate 25 is threadedly connected to the lead screw 23 and slidably connected to the slide rod 24 through the sliding hole, the rotation of the lead screw 23 will drive the lifting plate 25 to move downward smoothly. When the lifting plate 25 moves, the connecting rods 26 on its left and right sides move synchronously. The connecting rod 26 drives the first rotating rod 27 and the second rotating rod 29 to rotate around the fixed rod 213. The first clamping block 28 at the top of the first rotating rod 27 moves towards the top of the sample, and finally the L-shaped first clamping block 28 presses against the top edge of the sample to achieve vertical clamping. At the same time, the second clamping block 210 at the top of the second rotating rod 29 moves towards the side of the sample to press against the side of the sample to achieve horizontal clamping. The two work together to form a two-dimensional clamping, preventing the sample from slipping in one direction during the tensile test. During the clamping process, the pressure sensor 211 inside the first clamping block 28 and the second clamping block 210... The clamping force is monitored in real time, and the pressure data is converted into an electrical signal and transmitted to the controller 11. If the pressure value is lower than the set threshold, the controller 11 controls the motor 22 to continue driving the lifting plate 25 to descend, increasing the clamping force. If the pressure value is higher than the set threshold to prevent sample damage, the controller 11 controls the motor 22 to rotate in the opposite direction, causing the lifting plate 25 to rise slightly, reducing the clamping force, until the clamping force stabilizes within the optimal range of "no slippage and no damage". At the same time, the toothed silicone anti-slip pad 212 on the outside of the pressure sensor 211 increases the friction with the sample through the diamond-shaped tooth pattern on its surface, further improving the anti-slip effect. To ensure the sample surface is not scratched during clamping, this embodiment uses a multi-dimensional adaptive clamping component 2 to simultaneously clamp the sample from both horizontal and vertical directions, creating a "two-way locking" effect. This prevents the sample from slipping in a single direction, ensuring that the sample remains in a stable clamping state throughout the test, thus providing a foundation for accurate tensile force data. Simultaneously, the pressure sensor equipped with this component monitors the pressure of the clamping block on the sample in real time. After the data is fed back to the controller, the clamping force can be dynamically adjusted via the drive component. This balances clamping reliability with protecting the original shape of the sample, preventing improper clamping from affecting the test results.

[0031] like Figures 5-6As shown, the lifting protective plate assembly 3 in another embodiment of the present invention is illustrated. The lifting protective plate assembly 3 includes a rectangular plate 30. The top of the rectangular plate 30 is fixedly connected to the protective plate 15. The bottom of the rectangular plate 30 is fixedly connected to two horizontal bars 31 that are symmetrical from left to right and run in a front-back direction. The rear ends of the two horizontal bars 31 are rotatably connected to X-shaped connecting rods 32. The bottom rear of the two X-shaped connecting rods 32 are rotatably connected to a horizontal plate 33 that is fixedly connected to the inner bottom wall of the hollow base 1.

[0032] The side walls of the two horizontal bars 31 are provided with rolling grooves 34, and the interior of the two rolling grooves 34 is movably connected to rollers 35 that are rotatably connected to the front top of the X-shaped connecting rod 32. The side walls of the two horizontal plates 33 are provided with rolling grooves 310, and the interior of the two rolling grooves 310 is movably connected to rollers 311 that are rotatably connected to the front bottom of the X-shaped connecting rod 32.

[0033] Two connecting rods 36 arranged front and rear are rotatably connected above the opposite surfaces of the two X-shaped connecting rods 32. The top of each connecting rod 36 is fixedly connected to a fixing block 37. A screw 38 is rotatably connected to the front side of the rear fixing block 37. A limit block is fixedly connected to the front side of the screw 38. The outer wall of the screw 38 is threadedly connected to a threaded hole opened inside the front fixing block 37. A second motor 39 is fixedly connected to the rear wall of the rear fixing block 37. The output shaft of the second motor 39 passes through the front wall of the rear fixing block 37 and is fixedly connected to the screw 38. The controller 11 is electrically connected to the second motor 39.

[0034] In some examples, the top of the rectangular plate 30 is fixedly connected to the bottom of the protective plate 15 by bolts to transmit lifting power. The rear ends of the two horizontal bars 31 are rotatably connected to X-shaped connecting rods 32 via pins. The X-shaped connecting rods 32 consist of two intersecting 304 stainless steel rods hinged together by a central pin, providing telescopic adjustment. The bottom rear of the two X-shaped connecting rods 32 are rotatably connected to a second horizontal plate 33 via pins. The second horizontal plate 33 is fixedly connected to the inner bottom wall of the hollow base 1 by bolts, serving as a fixed support point for the X-shaped connecting rods 32. The second horizontal plate 33 has the same number, size, and position as the first horizontal bar 31. The two horizontal bars 31... Each of the two side walls of the first plate 33 has a rolling groove 34, which is a rectangular through groove. Rollers 35 are movably connected inside the two rolling grooves 34. The rollers 35 are rotatably connected to the front top of the X-shaped connecting rod 32 through a pin, so that the rollers 35 can slide along the rolling grooves 34 when the X-shaped connecting rod 32 extends or retracts. Each of the two side walls of the two horizontal plates 33 has a rolling groove 310, which is also a rectangular through groove. Rollers 311 are movably connected inside the two rolling grooves 310. The rollers 311 are rotatably connected to the front bottom of the X-shaped connecting rod 32 through a pin, so as to achieve the smooth extension and retraction of the X-shaped connecting rod 32 in conjunction with the rollers 35. In some examples, a screw 38 is rotatably connected to the front side of the rear fixing block 37 via a bearing. The surface of the screw 38 is machined with fine threads. A limit block is fixedly connected to the front side of the screw 38 by welding to prevent the screw 38 from coming out of the threaded hole. The outer wall of the screw 38 is threadedly connected to the threaded hole opened inside the front fixing block 37 to form a screw drive structure. The second motor 39 is a two-phase stepper motor of model 42HS40, which is used to provide power for the rotation of the screw 38. The output shaft of the second motor 39 passes through the front side wall of the rear fixing block 37 and is fixedly connected to the screw 38 via a coupling. The signal output terminal of the controller 11 is connected to the second motor 39 via a wire, which can control the forward and reverse rotation and speed of the second motor 39, thereby driving the X-shaped connecting rod 32 to extend and retract, realizing the lifting and lowering operation of the protective plate 15.

[0035] After clamping is completed, when the protective plate 15 needs to be raised or lowered, the controller 11 controls the second motor 39 to rotate. The screw 38 drives the two fixing blocks 37 to move closer to each other. The fixing blocks 37 push the connecting rod 36 to extend the X-shaped connecting rod 32. The first roller 35 and the second roller 311 slide along the corresponding rolling grooves respectively. The X-shaped connecting rod 32 drives the rectangular plate 30 and the protective plate 15 to rise along the slide groove 14 until the protective plate 15 rises to the highest position, completely surrounding the multi-dimensional adaptive clamping assembly 2 and the sample, forming a safety barrier to prevent the sample from breaking and splashing during the test. The operator can observe the internal test status in real time through the observation window 16 on the front side of the protective plate 15. After the protection is in place, the controller 11 starts the tensile testing machine 13 on the inner top wall of the L-shaped fixing plate 12. The test end of the tensile testing machine 13 extends downward and connects to the top of the sample. Then the tensile testing machine 13 is set to... The tensile testing machine 13 applies upward tension at a certain rate, while simultaneously recording the tension data and sample deformation data, and transmitting the data to the controller 11 in real time. The test curve and key parameters are displayed on the touch screen. When the sample reaches the breaking strength or the test is completed, the tensile testing machine 13 stops applying tension and resets. The operator controls the protective plate 15 to descend through the controller 11, and then controls the motor 22 to rotate in the opposite direction, so that the first clamping block 28 and the second clamping block 210 are separated from the sample. Finally, the tested sample is taken out, completing a complete tensile test process. In this embodiment, the lifting protective plate assembly 3 can drive the protective plate to rise to a closed state, forming a protective barrier around the clamping mechanism and the sample, effectively blocking the fragments from flying outward, preventing the fragments from scratching the operator or damaging the surrounding equipment. Especially for samples with high hardness such as metal and glass fiber, it can significantly reduce the probability of safety accidents.

[0036] The working principle and usage process of this utility model are as follows: When a sample needs to be clamped, the operator places the sample to be tested on the top of the hollow clamping frame 21 of the multi-dimensional adaptive clamping component 2, ensuring that the top edge of the sample corresponds to the first clamping block 28 and the side corresponds to the second clamping block 210. Then, the controller 11 starts the motor 22, and the output shaft of the motor 22 drives the lead screw 23 inside the hollow clamping frame 21 to rotate. Since the lifting plate 25 is threadedly connected to the lead screw 23 and slidably connected to the slide rod 24 through the sliding hole, the rotation of the lead screw 23 will drive the lifting plate 25 to move downward smoothly. When the lifting plate 25 moves, its left and right sides... The connecting rod 26 on the side moves synchronously, driving the first rotating rod 27 and the second rotating rod 29 to rotate around the fixed rod 213. The first clamping block 28 at the top of the first rotating rod 27 moves towards the top of the sample, and finally the L-shaped first clamping block 28 presses against the top edge of the sample to achieve vertical clamping. At the same time, the second clamping block 210 at the top of the second rotating rod 29 moves towards the side of the sample to press against the side of the sample to achieve horizontal clamping. The two work together to form a two-dimensional clamping, preventing the sample from slipping in a single direction during the tensile test. During the clamping process, the inner sides of the first clamping block 28 and the second clamping block 210... The pressure sensor 211 monitors the clamping force in real time and converts the pressure data into an electrical signal, which is then transmitted to the controller 11. If the pressure value is lower than a set threshold, the controller 11 controls the motor 22 to continue driving the lifting plate 25 downward, increasing the clamping force. If the pressure value is higher than the set threshold, preventing sample damage, the controller 11 controls the motor 22 to rotate in the opposite direction, causing the lifting plate 25 to rise slightly, reducing the clamping force until it stabilizes within the optimal range of "no slippage, no damage." Simultaneously, the toothed silicone anti-slip pad 212 on the outside of the pressure sensor 211 increases the friction with the sample through its diamond-shaped serrations, further enhancing the clamping force. To prevent slippage and avoid scratching the sample surface during clamping, this embodiment uses a multi-dimensional adaptive clamping component 2 to simultaneously clamp the sample from both horizontal and vertical directions, creating a "two-way locking" effect. This prevents the sample from slipping in a single direction, ensuring that the sample remains in a stable clamping state throughout the test, thus providing a foundation for accurate tensile force data. Simultaneously, the pressure sensor equipped with this component monitors the pressure of the clamping block on the sample in real time. After the data is fed back to the controller, the clamping force can be dynamically adjusted via the drive component. This balances clamping reliability with protecting the original shape of the sample, preventing improper clamping from affecting the test results.

[0037] After clamping is completed, when the protective plate 15 needs to be raised or lowered, the controller 11 controls the second motor 39 to rotate. The screw 38 drives the two fixing blocks 37 to move closer to each other. The fixing blocks 37 push the connecting rod 36 to extend the X-shaped connecting rod 32. The first roller 35 and the second roller 311 slide along the corresponding rolling grooves respectively. The X-shaped connecting rod 32 drives the rectangular plate 30 and the protective plate 15 to rise along the slide groove 14 until the protective plate 15 rises to the highest position, completely surrounding the multi-dimensional adaptive clamping assembly 2 and the sample, forming a safety barrier to prevent the sample from breaking and splashing during the test. The operator can observe the internal test status in real time through the observation window 16 on the front side of the protective plate 15. After the protection is in place, the controller 11 starts the tensile testing machine 13 on the inner top wall of the L-shaped fixing plate 12. The test end of the tensile testing machine 13 extends downward and connects to the top of the sample. Then the tensile testing machine 13 is set to... The tensile testing machine 13 applies upward tension at a certain rate, while simultaneously recording the tension data and sample deformation data, and transmitting the data to the controller 11 in real time. The test curve and key parameters are displayed on the touch screen. When the sample reaches the breaking strength or the test is completed, the tensile testing machine 13 stops applying tension and resets. The operator controls the protective plate 15 to descend through the controller 11, and then controls the motor 22 to rotate in the opposite direction, so that the first clamping block 28 and the second clamping block 210 are separated from the sample. Finally, the tested sample is taken out, completing a complete tensile test process. In this embodiment, the lifting protective plate assembly 3 can drive the protective plate to rise to a closed state, forming a protective barrier around the clamping mechanism and the sample, effectively blocking the fragments from flying outward, preventing the fragments from scratching the operator or damaging the surrounding equipment. Especially for samples with high hardness such as metal and glass fiber, it can significantly reduce the probability of safety accidents.

[0038] It should be noted that the controller 11, tensile testing machine 13, pressure sensor 211, and various motors are all common models on the market, and each component is a device or equipment that exists in the prior art or can be implemented by the prior art. Their power supply, specific composition and principle are clear to those skilled in the art. At the same time, the fixed connection method mentioned in this utility model can adopt the connection methods that exist in the prior art and are common, such as bolts, welding and bonding, so they will not be described in detail.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A sample clamping mechanism for tensile testing that prevents slippage, characterized in that, include: Hollow base (1), with four corners of the bottom of the hollow base (1) fixedly connected to support legs (10), a controller (11) fixedly connected to the front side of the hollow base (1), an L-shaped fixing plate (12) fixedly connected to the rear of the top of the hollow base (1), a tensile testing machine (13) fixedly connected to the inner top wall of the L-shaped fixing plate (12), and a sliding groove (14) opened on the top of the hollow base (1). Multi-dimensional adaptive clamping component (2) is set at the top center of the hollow base (1). The multi-dimensional adaptive clamping component (2) is used to clamp the sample in two dimensions in the horizontal and vertical directions and the clamping force can be dynamically adjusted. The lifting protective plate assembly (3) is located inside the hollow base (1) and is used to lift the protective plate (15).

2. The anti-slip sample clamping mechanism for tensile testing according to claim 1, characterized in that, The inner wall of the chute (14) is slidably connected to a protective plate (15), and an observation window (16) is provided on the front side of the protective plate (15).

3. The anti-slip sample clamping mechanism for tensile testing according to claim 2, characterized in that, The multi-dimensional adaptive clamping assembly (2) includes a fixed frame (20), which is fixedly connected to the top of the hollow base (1). A hollow clamping frame (21) is fixedly connected to the top of the fixed frame (20). A motor (22) is fixedly connected to the bottom of the hollow clamping frame (21). A lead screw (23) is rotatably connected to the inner walls of the upper and lower sides of the hollow clamping frame (21). The output shaft of the motor (22) passes through the interior of the hollow clamping frame (21) and is fixedly connected to the lead screw (23). Slide rods (24) are provided on both the left and right sides of the lead screw (23) and are fixedly connected to the inner walls of the hollow clamping frame (21). A lifting plate (25) is threadedly connected to the outer walls of the two slide rods (24).

4. The anti-slip sample clamping mechanism for tensile testing according to claim 3, characterized in that, The lifting plate (25) is rotatably connected to the left and right sides with connecting rods (26). The ends of the two connecting rods (26) away from the lifting plate (25) are rotatably connected to the first rotating rods (27). The tops of the two first rotating rods (27) are fixedly connected to the first clamping blocks (28). The first clamping blocks (28) have an inverted L-shaped structure for clamping the top of the sample. The inner walls of the front and rear sides of the hollow clamping frame (21) are rotatably connected to two left and right symmetrical fixing rods (213). The two first rotating rods (27) are rotatably connected to the front side of the outer wall of the two fixing rods (213). The rear side of the outer wall of the two fixing rods (213) is rotatably connected to the second rotating rods (29). The bottoms of the two second rotating rods (29) are rotatably connected to the left and right connecting rods (26). The tops of the two second rotating rods (29) are fixedly connected to the second clamping blocks (210).

5. The anti-slip sample clamping mechanism for tensile testing according to claim 4, characterized in that, Pressure sensors (211) are fixedly connected to the side of the two first clamping blocks (28) on the left and right and the two second clamping blocks (210) on the left and right, respectively, and toothed silicone anti-slip pads (212) are fixedly connected to the side of the two pressure sensors (211) on the left and right, respectively, and the controller (11) is electrically connected to the motor (22) and the pressure sensor (211).

6. The anti-slip sample clamping mechanism for tensile testing according to claim 2, characterized in that, The lifting protective plate assembly (3) includes a rectangular plate (30). The top of the rectangular plate (30) is fixedly connected to the protective plate (15). The bottom of the rectangular plate (30) is fixedly connected to two horizontal bars (31) that are symmetrical and run in a front-back direction. The rear ends of the two horizontal bars (31) are rotatably connected to X-shaped connecting rods (32). The bottom rear of the two X-shaped connecting rods (32) are rotatably connected to a horizontal plate (33) that is fixedly connected to the inner bottom wall of the hollow base (1).

7. The anti-slip sample clamping mechanism for tensile testing according to claim 6, characterized in that, The side walls of the two horizontal bars (31) are provided with rolling grooves (34), and the interior of the two rolling grooves (34) is movably connected to rollers (35) that are rotatably connected to the front top of the X-shaped connecting rod (32). The side walls of the two horizontal plates (33) are provided with rolling grooves (310), and the interior of the two rolling grooves (310) is movably connected to rollers (311) that are rotatably connected to the front bottom of the X-shaped connecting rod (32).

8. The anti-slip sample clamping mechanism for tensile testing according to claim 7, characterized in that, Two connecting rods (36) arranged in front and behind are rotatably connected above the opposite surfaces of the two X-shaped connecting rods (32). The top of each of the two connecting rods (36) is fixedly connected to a fixing block (37). A screw (38) is rotatably connected to the front side of the rear fixing block (37). A limit block is fixedly connected to the front side of the screw (38). The outer wall of the screw (38) is threadedly connected to the threaded hole opened inside the front fixing block (37). A second motor (39) is fixedly connected to the rear side wall of the rear fixing block (37). The output shaft of the second motor (39) passes through the front side wall of the rear fixing block (37) and is fixedly connected to the screw (38). The controller (11) is electrically connected to the second motor (39).

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