Tension testing device for material testing

Abstract

The application relates to the technical field of material tension test, in particular to a tension test device for material detection, which solves the problem of material installation on the existing clamp of the tension test device, and comprises a rack, a clamp is installed on the rack and used for clamping the material, a driving device is arranged on the rack and used for driving the clamp to move so as to adjust the spacing between the two clamps, a force value measurer is installed on the clamp and used for measuring the tension value of the material, a clamping groove is arranged in the clamp, an adjustable clamping plate is arranged on one side of the clamping groove, and an installation plate is arranged on the other side of the clamping groove and used for installing the material, the clamping plate is adjusted to be close to the installation plate, and the two are matched to clamp the material; a protruding limiting edge is arranged on the end face of the installation plate towards the clamping plate, the limiting edge is used for limiting the installation position of the end part of the material, the length of the material clamped by the clamping plate and the installation plate is controlled, and the position of the limiting edge is adjustable, so that the length of the material clamped by the clamping plate and the installation plate can be adjusted.

Description

Technical Field

[0001] This invention relates to the field of tensile testing technology for materials, specifically a tensile testing device for material testing. Background Technology

[0002] In modern industry and scientific research, accurate testing of material properties is crucial for ensuring product quality and driving technological innovation. Materials testing, as an important technical branch spanning multiple disciplines such as mechanical manufacturing, aerospace, civil engineering, and the automotive industry, aims to quantify the mechanical, physical, and chemical properties of materials through scientific methods. Tensile testing, as one of the most fundamental and widely used methods in materials testing, aims to accurately obtain key mechanical properties such as tensile strength, yield strength, and elongation by simulating the behavior of materials under tensile loads. These data are not only the core basis for material research and selection but also an important reference for product structure design and process optimization.

[0003] The basic principle of existing tensile testing is to mount the material to be tested onto clamps on both sides of the tensile testing device, fixing the material at both ends with the clamps. Then, a linear tensile load is applied through a drive mechanism. During this process, load and displacement data are collected simultaneously, and finally, the mechanical response of the material is analyzed through data processing. In actual operation, to ensure the standardization and repeatability of the test, the staff needs to pre-cut or cut the material into specimens with specific geometric dimensions, such as common strip material specimens. The test length of the specimen is one of the key parameters affecting the test results.

[0004] However, existing tensile testing devices have certain shortcomings in practical operation. Current fixtures lack mechanisms to define the material's position, making it impossible to precisely control the length of material within the fixture. This leads to an inability to guarantee the certainty of the length of the unclamped portion of material between the two fixtures during testing. For example, when the two side fixtures hold a longer length of material, the reserved length of the stretched material in the middle becomes shorter; conversely, when the two side fixtures hold a shorter length, the reserved length in the middle becomes longer. For instance, if the two side fixtures hold 2 cm, the reserved length in the middle is 10 cm; but if the two side fixtures hold 1 cm, the reserved length in the middle becomes 11 cm. This difference in reserved length significantly affects the tensile force value during tensile testing, easily leading to large errors in the test results and reducing the accuracy of the tensile test. Extensive experimental data shows that for every 1 cm increase in the gauge length fluctuation range, the error rate of the tensile test results can increase by 5%-8%. Therefore, there is an urgent need to develop a tensile testing device that can precisely limit the length of the material installation position in order to improve the accuracy and reliability of material tensile testing. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a tensile testing device for material testing, which solves the problems that arise when materials are mounted onto the fixtures of existing tensile testing devices.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a tensile testing device for material testing, comprising a frame, on which are mounted opposing clamps for clamping materials; a driving device is provided on the frame for driving the clamps to move and adjust the distance between the two clamps; a force measuring device is installed on the clamps; when the driving device drives the clamps to move, the force measuring device measures the tensile force of the material; a clamping groove is provided inside the clamps; a position-adjustable clamping plate is provided on one side of the clamping groove, and a mounting plate is provided on the other side; the mounting plate is used to mount the material; by adjusting the clamps to move closer to the mounting plate, the two cooperate to clamp the material; a protruding limiting edge is provided on the end face of the mounting plate facing the clamps to limit the installation position of the material end, thereby controlling the length of the material clamped by the clamps and the mounting plate, and the position of the limiting edge is adjustable to adjust the length of the material clamped by the clamps and the mounting plate.

[0009] Furthermore, a threaded rod is mounted on the mounting plate, and the threaded rod is connected to the limiting edge. The position of the limiting edge can be adjusted by rotating the threaded rod.

[0010] Furthermore, a mounting block is fixedly provided on the other end face of the mounting plate, the threaded rod is rotatably connected to the mounting block, a connecting block is fixedly provided on the limiting edge, the connecting block is threadedly connected to the threaded rod, a through groove is provided on the mounting plate for the connecting block to pass through, a screwing block for rotating the threaded rod is provided on the threaded rod, and a scale for the limiting edge to refer to is marked on the mounting plate.

[0011] Furthermore, a clamping assembly is installed on the limiting edge, the clamping assembly being used to clamp one end of the material.

[0012] Furthermore, the clamping assembly is hinged to the limiting edge, and the clamping assembly rotates in a fan shape with the plane where the mounting plate is located as a reference and the hinge position as an axis to adjust the clamping position of the clamping assembly.

[0013] Furthermore, the clamping assembly includes a support frame, a support shaft slidably connected to the support frame, and a spring that provides elastic force to the support shaft. A stop block is provided at the end of the support shaft facing the mounting plate. A spring is provided between the stop block and the support frame, and the spring is sleeved on the outside of the support shaft. The elastic force of the spring causes the stop block to press against the mounting plate for clamping materials. A hand-held block is fixedly provided at the other end of the support shaft. A connecting shaft is installed on the limiting edge. The support frame is rotatably connected to the connecting shaft. A positioning cylinder is provided on the limiting edge. The stop block enters into the positioning cylinder for positioning the stop block. The positioning cylinder is semi-circular.

[0014] Furthermore, the mounting plate is movably installed in the clamping groove, and can be moved out of the clamping groove by moving the mounting plate.

[0015] Furthermore, the mounting plate and the clamp are connected by a connecting assembly.

[0016] Furthermore, the connecting assembly includes a mounting bracket fixedly mounted on the mounting plate and a connector mounted on the mounting bracket. The clamp has a mounting groove for the mounting bracket to move, and a sliding groove is formed on the inner wall of the mounting groove. The connector is installed in the sliding groove and can move within the sliding groove.

[0017] Furthermore, a magnet for adsorbing the mounting plate is installed in the clamping groove of the above-mentioned fixture, and the magnet adsorbs the mounting plate to fix the mounting plate.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the present invention provides a tensile testing device for material testing, which has the following beneficial effects:

[0020] This tensile testing device for material testing, through the setting of a limiting edge on the mounting plate, allows the end of the material to precisely abut against the limiting edge, clearly defining the length of the material held by the clamping plate and the mounting plate. This effectively avoids fluctuations in clamping length caused by manual installation deviations, ensuring that the clamping length at both ends of the material remains consistent in tests of the same batch or different batches, eliminating testing errors caused by gauge length differences at the source.

[0021] For example, after the limiting edge precisely controls the installation position of the material end, the clamping length of the two clamps is strictly standardized, thus keeping the intermediate gauge length (i.e., gauge length) of the unclamped material between the two clamps constant. For instance, when the limiting edge is set to a clamping length of 1cm, the intermediate gauge length of all samples is 10cm; when the limiting edge is set to a clamping length of 0.5cm, the intermediate gauge length of all samples is 11cm. This ensures that the stress and strain calculations during tensile testing are based on a unified standard, significantly reducing the error in tensile values ​​caused by inconsistent gauge lengths, and significantly improving the accuracy and reliability of the test results.

[0022] With adjustable limit edge position, the length of the material end being clamped can be freely set according to the test requirements. Without changing the fixture or complicated operations, different clamping lengths can be quickly switched to meet the needs of diverse test scenarios. This not only improves the practicality of the device but also simplifies the operation process, making it convenient to conduct tensile tests on materials of various specifications. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of the clamp of the present invention, wherein the clamp is a lower clamp;

[0025] Figure 3 This is a front view of the fixture of the present invention, wherein the fixture is a lower fixture;

[0026] Figure 4 This is a three-dimensional structural diagram of the clamp of the present invention, wherein the mounting plate is translated upwards;

[0027] Figure 5 This is a three-dimensional structural diagram of the clamp of the present invention, wherein the mounting plate is flipped.

[0028] Figure 6 This is a three-dimensional structural diagram of the fixture of the present invention, wherein the mounting plate is attached to the outer wall of the fixture;

[0029] Figure 7 This is a cross-sectional view of the fixture of the present invention;

[0030] Figure 8 This is a three-dimensional structural diagram of the clamp of the present invention, wherein the clamp is an upper clamp;

[0031] Figure 9 This is a three-dimensional structural diagram of the clamp of the present invention, wherein the clamp is an upper clamp and the mounting plate is in the clamping groove;

[0032] Figure 10 This is a first three-dimensional structural diagram of the mounting plate of the present invention, wherein the connecting member is a shaft;

[0033] Figure 11 This is a second three-dimensional structural diagram of the mounting plate of the present invention;

[0034] Figure 12 This is a side view of the mounting plate of the present invention.

[0035] Figure 13 This is a three-dimensional structural diagram of the mounting plate of the present invention, wherein the connecting member is a slider;

[0036] Figure 14 For the present invention Figure 5 A partially enlarged structural diagram of point A shown in the image;

[0037] Figure 15 For the present invention Figure 8 A partially enlarged structural diagram of point B shown in the image;

[0038] Figure 16 For the present invention Figure 11 The diagram shows a partially enlarged structural schematic at point C.

[0039] In the diagram: 1. Controller; 2. Base; 3. Frame; 4. Clamp; 5. Force measuring device; 6. Mounting seat; 7. Connecting seat; 8. Sensor; 9. Limit block; 10. Clamping groove; 11. Clamping plate; 12. Mounting plate; 13. Limit edge; 14. Mounting groove; 15. Slide groove; 16. Mounting bracket; 17. Connector; 18. Lead screw; 19. Threaded rod; 20. Connecting block; 21. Through groove; 22. Mounting block; 23. Tightening block; 24. Pulling block; 25. Connecting shaft; 26. Support frame; 27. Support shaft; 28. Abutment block; 29. ​​Spring; 30. Hand-held block; 31. Positioning cylinder; 32. Guide rod; 33. Tightening cap; 34. Groove one; 35. Magnet; 36. Groove two; 37. Magnet; 38. Dust cover. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The existing tensile testing device for material testing includes a controller 1 and a frame 3. The frame 3 has clamps 4 arranged opposite each other, which are used to hold the material to be tested. The frame 3 is also equipped with a drive device, which is used to drive the clamps 4 to move to adjust the distance between the two clamps 4 (such as a motor and lead screw to drive the clamps 4 to move, or a hydraulic cylinder to drive the clamps 4 to move). A force measuring device is installed on the clamps 4. When the drive device drives the clamps 4 to move, the force measuring device 5 can measure the tensile force of the material.

[0042] In the existing tensile testing device for material testing, the frame 3 has a base 2 at the bottom. The base 2 is fixedly connected to one of the clamps 4 via a mounting seat 6. The other clamp 4 is connected to the drive device via a connecting seat 7. The force measuring device 5 is installed between the connecting seat 7 and the clamp 4. This tensile testing device for material testing can realize a single-end drive mode in which one clamp 4 is fixed and the other clamp 4 moves, or it can support a double-end drive mode in which both clamps 4 are driven at the same time. When the drive device is working, the force measuring device 5 can measure the tensile force value of the material in real time.

[0043] The controller 1 can precisely control the movement of the drive device and receive force data transmitted from the force measuring device 5. The controller 1 is equipped with a display screen, which can display the force value transmitted from the force measuring device 5 in real time and record and store it, so that operators can view and analyze the test data at any time.

[0044] The drive unit is usually installed inside the frame 3. The outside of the frame 3 is usually equipped with a retractable dust cover 38. The dust cover 38 is used to shield the drive unit and can effectively prevent dust, debris and other objects from entering, thus playing a role in dust prevention and protection, ensuring the normal operation of the drive unit, and thus ensuring the accuracy of measurement.

[0045] Since the fixture 4 mounted on the connecting seat 7 is movable, a sensor 8, such as a photoelectric sensor or a limit switch, can be installed on the connecting seat 7. Limit blocks 9 are provided on both sides of the frame 3. When the sensor 8 approaches the limit block 9, it will transmit a signal to the controller 1, and the controller 1 will control the drive device to stop working, thereby limiting the movement range of the movable fixture 4.

[0046] The above description is a structural description of existing tensile testing devices for material testing, intended to facilitate a clear understanding of the structure of existing tensile testing devices by technical personnel. The illustrative examples above do not limit the driving method, setting method, etc., and the description of this existing structure does not affect the definition of the scope of protection of the innovative content of this invention described below.

[0047] Please see Figure 1 As shown, a tensile testing device for material testing according to the present invention has a clamping groove 10 inside the clamp 4. An adjustable clamping plate 11 is provided on one side of the clamping groove 10, and a mounting plate 12 is installed on the other side. The mounting plate 12 serves as a reference carrier for mounting the material to be tested. The clamping plate 11 can be moved manually or automatically, moving closer to or away from the mounting plate 12. When the clamping plate 11 moves closer to the mounting plate 12, the two cooperate to apply an appropriate clamping force, achieving a stable clamping of the material.

[0048] like Figure 2-9As shown, a protruding limiting edge 13 is provided on the end face of the mounting plate 12 facing the clamping plate 11, and the limiting edge 13 and the clamping plate 11 are designed to be staggered. When the clamping plate 11 moves toward the mounting plate 12 and is fully engaged, the limiting edge 13 and the clamping plate 11 do not interfere with each other, which ensures the tight clamping effect of the clamping plate 11 and the mounting plate 12 on the material, and avoids the limiting edge 13 being sandwiched between the two and affecting the clamping stability. The limiting edge 13 plays the role of precisely defining the installation position of the material end. When the material is installed on the mounting plate 12, its end abuts against the limiting edge 13, thereby determining the installation position of the material in the clamping groove 10, thereby limiting the length of the material clamped by the clamping plate 11 and the mounting plate 12. Furthermore, the position of the limiting edge 13 can be adjusted by adjusting the components, such as by using the threaded rod 19 or the sliding rail slider as described in detail below, to move the limiting edge 13 along the surface of the mounting plate 12. By flexibly adjusting the position of the limit edge 13, the length of the material being clamped can be precisely controlled according to different testing requirements, thereby improving the adaptability of the testing device to materials of different specifications and testing requirements, and ensuring the accuracy and reliability of the test results.

[0049] The movement drive of the clamping plate 11 is divided into two types: manual and automatic. Automatic adjustment can be achieved using power components such as electric telescopic rods and hydraulic cylinders, with the displacement of the clamping plate 11 precisely controlled by a control system. Manual adjustment can be achieved using a lead screw 18 threadedly connected to the clamp 4. One end of the lead screw 18 is rotatably connected to the clamping plate 11 via a bearing, and the other end extends to the outside of the clamp 4 and is fitted with a screw cap 33. By rotating the screw cap 33, the operator drives the lead screw 18 to rotate axially, using the threaded transmission principle to make the clamping plate 11 move linearly along the direction of the mounting plate 12, allowing the clamping plate 11 to move closer to or away from the mounting plate 12, thereby achieving fine adjustment of the material clamping force.

[0050] To further improve the stability and guiding accuracy of the clamping plate 11, a guide rod 32 is fixedly installed on the back of the clamping plate 11. The other end of the guide rod 32 passes through the side plate of the clamp 4 and forms a sliding fit with the guide hole on the side plate. The cooperation between the guide rod 32 and the guide hole can effectively suppress the swaying and shaking of the clamping plate 11 during the movement process, ensuring that the clamping plate 11 always moves smoothly along the preset trajectory.

[0051] As shown in 10 and 13, the position of the limiting edge 13 is preferably adjusted by rotating the threaded rod 19. A rotatable threaded rod 19 is mounted on the mounting plate 12, and this threaded rod 19 is connected to the limiting edge 13 via a threaded connection. Utilizing the helical transmission principle of the threaded rod 19, rotating the threaded rod 19 allows the limiting edge 13 to move linearly along the surface of the mounting plate 12. This adjustment method has linear and stepless adjustment characteristics, meaning that the operator can achieve minute changes in the position of the limiting edge 13 through a small rotation angle, avoiding the step-by-step errors of traditional snap-on or gear-type adjustments, and significantly improving adjustment accuracy.

[0052] From an operational convenience perspective, the adjustment process of rotating the threaded rod 19 can be achieved simply by hand-tightening. A screw block 23 can be fixedly installed on the threaded rod 19, allowing direct operation by hand rotation. Alternatively, the end of the threaded rod 19 can be connected to the rotating end of a motor. The motor can be a servo motor or a stepper motor, fixed to the mounting plate 12 via a motor mount, allowing for electric adjustment of the position of the limit edge 13. Regardless of whether manual or electric adjustment is used, no complex disassembly or assembly steps are required, significantly simplifying the adjustment process. Furthermore, the self-locking characteristic of the threaded rod 19 ensures that the limit edge 13 remains stable after adjustment to the target position, preventing displacement due to vibration or external forces during testing, thus ensuring the consistency of the material clamping length. Adjustment via the threaded rod 19 balances adjustment accuracy, operational convenience, and structural stability.

[0053] In a specific implementation of the adjustment via the threaded rod 19, a mounting block 22 is provided on the other end face of the mounting plate 12 via a fixed structure (such as welding, bolt fastening, etc.). This mounting block 22 provides a rotational support base for the threaded rod 19, allowing the threaded rod 19 to rotate along its axis. A connecting block 20 is fixedly provided at the edge position of the limiting line 13 via welding or screw connection. The inner hole of this connecting block 20 is machined with an internal thread that matches the external thread of the threaded rod 19, thereby forming a threaded transmission pair with the threaded rod 19. A through groove 21 is provided on the mounting plate 12 corresponding to the moving path of the connecting block 20. The width of the through groove 21 is adapted to the size of the connecting block 20, allowing the connecting block 20 to pass through the mounting plate 12 and move along the groove, while also limiting the shaking of the connecting block 20. A screwing block 23 is provided at one end of the threaded rod 19. The surface of the screwing block 23 can be designed with anti-slip textures or concave-convex structures to facilitate the user to rotate the threaded rod 19 by hand. The surface of the mounting plate 12 (such as one side of the through groove 21 or next to the movement trajectory of the limit line 13) is clearly marked with scale lines and corresponding values. The scale is based on the fixed end of the mounting plate 12 as the reference zero point, which is used to accurately reflect the movement distance or position of the limit line 13, providing users with an intuitive adjustment reference.

[0054] A clamping component is installed on the limiting edge 13 to clamp and fix one end of the material, improving the stability of the material after it is installed on the mounting plate 12. Since the clamping component is installed on the limiting edge 13, the clamping component can move synchronously with the limiting edge 13, ensuring that the clamping component can effectively clamp the material when the limiting edge 13 is in different positions.

[0055] The clamping assembly can be a clamp or a flexible metal sheet. The clamping assembly can have its own clamping function, such as using a clamp to hold materials; or it can cooperate with the mounting plate 12 to achieve the clamping function, for example, using a flexible metal sheet in conjunction with the mounting plate 12 for clamping. In its normal state, the end or one side of the metal sheet remains in contact with the surface of the mounting plate 12. When material is placed between the metal sheet and the mounting plate 12, the metal sheet deforms due to its elasticity, forming a grip with the mounting plate 12 through elastic force, thereby applying a clamping force to the material and achieving stable fixation. The metal sheet utilizes its elastic deformation characteristics to adapt to materials of different thicknesses, completing the clamping without additional operation, combining convenience and stability.

[0056] The clamping assembly and the limiting edge 13 are connected by a hinge. The clamping assembly rotates around the hinge position, with the plane of the mounting plate 12 as the reference. Its rotation trajectory forms a fan-shaped area on the plane of the mounting plate 12. The clamping assembly can be rotated to any angle position according to material clamping requirements, achieving precise clamping of materials in different orientations (such as horizontal, vertical, or oblique). This fan-shaped rotation design makes the adjustment of the clamping assembly more flexible, adapting to multi-angle material fixing scenarios, further improving the applicability and ease of operation of the device. It significantly enhances the practicality and applicability of the device, especially suitable for complex working conditions requiring fixing of different areas of material.

[0057] like Figure 11 , 12As shown in Figures 14 and 16, the present invention further provides a specific embodiment of a clamping assembly, which includes a support frame 26, a support shaft 27, and a spring 29. The support shaft 27 is slidably connected to the support frame 26, enabling smooth linear movement on the support frame 26. A stop block 28 is provided at the end of the support shaft 27 facing the mounting plate 12 to increase the force-bearing area. The spring 29 is sleeved on the outside of the support shaft 27 (the support shaft 27 provides guidance for the movement direction of the spring 29) and is located between the stop block 28 and the support frame 26, providing elastic force to the support shaft 27. Under the action of the elastic force of the spring 29, the stop block 28 always abuts against the mounting plate 12. When it is necessary to clamp material, the material is placed between the stop block 28 and the mounting plate 12, and the elastic force of the spring 29 makes the stop block 28 press the material tightly, thereby achieving effective clamping of the material. A hand-held block 30 is fixedly installed at the other end of the support shaft 27, which allows the operator to manually operate the support shaft 27. By pulling or pushing the hand-held block 30, the distance between the stop block 28 and the mounting plate 12 can be controlled, thereby enabling the insertion and removal of materials.

[0058] like Figure 11 As shown, a connecting shaft 25 is mounted on the limiting edge 13, and the support frame 26 is rotatably connected to the connecting shaft 25. This allows the clamping assembly to rotate around the connecting shaft 25, thereby adjusting the angle of the clamping assembly to accommodate materials of different shapes and sizes and different clamping requirements. The operator can rotate the clamping assembly to a suitable position according to the actual situation to clamp different parts of the material.

[0059] like Figure 11 As shown, a positioning cylinder 31 is provided on the limiting edge 13. When clamping is not required, the abutment 28 can be rotated to the position of the positioning cylinder 31 and enter the positioning cylinder 31. The positioning cylinder 31 can position the abutment 28, fixing it in a specific position to prevent it from shaking or rotating randomly, thus ensuring the stability of the clamping assembly. The positioning cylinder 31 is circular or semi-circular. In this invention, a semi-circular shape is preferred. This semi-circular positioning cylinder facilitates the abutment 28 to enter and exit the positioning cylinder 31 through an opening on one side, making operation more convenient and faster, and improving operational efficiency.

[0060] This invention further improves the installation method of the mounting plate 12. The mounting plate 12 is movably installed in the clamping groove 10, and can be moved out of the clamping groove 10 through translation, rotation, and other operations. When dealing with soft materials such as rubber strips and plastic sheets that are easily bent or folded, the internal space of the clamping groove 10 is relatively small in the traditional installation method. This makes it difficult for operators to accurately install the materials onto the mounting plate 12 due to the limited space of the clamping groove 10. It is difficult to lay or fix these easily deformable materials flat and accurately on the surface of the mounting plate 12, which can easily lead to problems such as material wrinkles and positional displacement, affecting the accuracy of installation and consequently affecting the effect of subsequent accurate testing.

[0061] After moving the mounting plate 12 out of the clamping groove 10, the operating space is no longer limited by the clamping groove 10. Operators can more easily lay and align materials in an open environment, facilitating material installation on the mounting plate 12. For example, they can more intuitively adjust the stretch of the rubber band to ensure the material's edge is fully aligned with or abuts the limiting edge 13. For thin materials such as rubber bands and plastic sheets, installation difficulties caused by obstruction from the inner wall of the clamping groove 10 are avoided; the materials can be directly and smoothly adhered to the mounting plate 12 and initially fixed using clamping components and other structures. After the material is positioned and fixed on the mounting plate 12, the mounting plate 12 is moved back into the clamping groove 10, ensuring a stable fit between the mounting plate 12 and the clamping groove 10. This solves the technical challenge of accurately installing easily deformable materials in confined spaces, significantly improving operational convenience and material installation accuracy, and is particularly suitable for applications requiring high flatness and positional accuracy.

[0062] Furthermore, such as Figure 2-10 As shown, the mounting plate 12 and the clamp 4 are movably connected via a connecting assembly. This assembly allows the mounting plate 12 to be moved out of the clamping slot 10 by means of translation or rotation. The main function of the connecting assembly is to ensure that the mounting plate 12 does not detach from the clamp 4 when it is moved out, thus preventing loss or falling. While providing the mounting plate 12 with the flexibility to be moved out of the clamping slot 10, the connecting assembly also provides reliable positioning and support for the mounting plate 12 through physical structural constraints. It also provides precise guidance for the "move out-install-move in" operation process, ensuring that the mounting plate 12 can quickly return to the preset position within the clamping slot 10 each time it is moved into the clamping slot 10, improving operational efficiency and installation accuracy.

[0063] like Figure 10 and 13As shown, the specific implementation of the connecting assembly includes a mounting bracket 16 and a connector 17. Specifically, the mounting bracket 16 is fixed to the back of the mounting plate 12 by welding or bolts. A connector 17 (such as a shaft, slider, roller, or boss) extends outward from the mounting bracket 16 and connects to it. The clamp 4 has a mounting groove 14 adapted to the mounting bracket 16 at a corresponding position. Sliding grooves 15 are machined on both sides of the inner wall of the mounting groove 14. The connector 17 is embedded in the sliding groove 15 to form a sliding pair. When operation is required, the mounting plate 12 drives the mounting bracket 16 to move horizontally or rotate slightly along the sliding groove 15, so that the mounting plate 12 gradually moves out of the clamping groove 10. At this time, the connector 17 always moves within the sliding groove 15 and is blocked by the limiting structure at the end of the sliding groove 15, preventing the mounting bracket 16 from detaching from the clamp 4 as a whole. This design utilizes the guiding function of the slide 15 to ensure the stability of the moving trajectory of the mounting plate 12, and uses mechanical limits to prevent it from falling, while providing ample space for material installation. After the material is fixed, the mounting plate 12 can be precisely reset along the original slide 15 trajectory. The precision machining dimensions of the slide 15 ensure the positioning accuracy of the mounting plate 12 when it returns to its original position, solving the problem of traditional fixed structures being difficult to operate in confined spaces. It is especially suitable for the flat installation requirements of easily deformable materials such as rubber strips and plastic sheets.

[0064] It is worth noting that the threaded rod 19 is aligned with the mounting groove 14 on the mounting plate 12, allowing the threaded rod 19 to enter the mounting groove 14, so that the end face of the mounting plate 12 is tightly attached to the inner wall of the clamp 4, ensuring the stability of the mounting plate 12.

[0065] In existing tensile testing devices for material testing, the distribution of clamps 4 varies, commonly including vertical distribution and horizontal distribution. To accommodate different installation configurations of clamps 4, the installation method of the mounting bracket 16 used on the mounting plate 12 needs to be adapted and specified to meet diverse installation requirements.

[0066] When the opposing clamps 4 are vertically distributed, the connecting member 17 of the connecting assembly can adopt a combination structure of shaft and slide groove 15: the shaft is correspondingly embedded in the slide groove 15. For example... Figure 4-6 As shown in the direction of movement of the mounting plate 12, after the mounting plate 12 is moved out of the clamping groove 10, the shaft can rotate in the sliding groove 15, causing the mounting plate 12 to rotate around the shaft as the center, so that the mounting plate 12 abuts against the outer wall (top wall, bottom wall or side wall) of the clamp 4. The outer wall of the clamp 4 provides stable support for the mounting plate 12 and provides a reliable operating platform for material installation.

[0067] The mounting plate 12 is moved to an open space above or to the side of clamp 4. At this time, the shaft continues to move along the trajectory of slide groove 15, ensuring that the mounting plate 12 does not detach from clamp 4. After the material is installed, the mounting plate 12 is reversed, causing its shaft to fall back along slide groove 15. The outer wall of the top or side of clamp 4 contacts the mounting plate 12, forming a stable support structure and providing a reliable operating platform for material installation. This design, through the rotational cooperation of the shaft and slide groove 15, enables the mounting plate 12 to flexibly flip and position between the vertically distributed clamps 4. Utilizing the structure of clamp 4 itself to provide support, it expands the operating space while ensuring stability during installation, making it particularly suitable for material installation scenarios where clamp 4 operates vertically.

[0068] When installing the mounting plate 12 through the cooperation of the connector 17 and the slide 15, such as Figure 8-9 As shown, the mounting plate 12, installed on the upper clamp 4, will fall downwards from the slide groove 15 due to gravity. Therefore, a magnetic fixing structure can be provided in the clamping groove 10 of the upper clamp 4: such as... Figure 8 and 15 As shown, specifically, the inner wall of the clamping groove 10 has a groove 34, into which a magnet 35 (such as a permanent magnet) is embedded; the mounting plate 12 is made of steel or has an iron sheet fixed at a corresponding position on its surface. When the mounting plate 12 returns to the preset position within the clamping groove 10, the magnet 35 magnetically attracts the mounting plate 12, counteracting the effect of gravity and achieving gapless fixation. This design utilizes the rapid attraction characteristics of magnetic force, eliminating the need for additional manual locking operations. It ensures that the mounting plate 12 remains stable and does not shift during testing, while also facilitating quick assembly and disassembly. It is particularly suitable for vertical installation scenarios (such as vertically distributed clamps 4), improving the reliability and operational efficiency of the device.

[0069] like Figure 8 As shown, after the mounting plate 12 is removed from the clamping groove 10 of the upper clamp 4, a magnetic fixing structure can be added to the outer wall of the clamp 4 to ensure stable support during operation. Specifically, a second groove 36 is opened on the outer wall of the clamp 4, and a magnet 37 is embedded inside the groove 36. The mounting plate 12 can be made of steel, or an iron sheet can be fixed to its corresponding position. After the mounting plate 12 is removed from the clamping groove 10, the operator brings it close to the outer wall of the clamp 4, and the magnetic force generated by the magnet 37 quickly attracts the mounting plate 12, making it fit tightly against the surface of the clamp 4. Through this magnetic connection method, the clamp 4 can provide stable support for the mounting plate 12, avoiding the impact on installation accuracy due to shaking or displacement during material installation, adjustment and other operations.

[0070] In addition to the magnetic fixing structure used to securely install the mounting plate 12, other positioning devices can be selected to achieve the desired positioning. For example, mechanical snap-fit ​​devices achieve quick assembly and disassembly and precise positioning through the engagement of elastic claws and slots; positioning pin structures use conical or cylindrical pins inserted into corresponding pin holes to provide reliable circumferential and axial limiting; and wedge block positioning systems enhance the vibration resistance of the mounting plate 12 through the friction and compressive force generated by the wedge angle. These positioning devices can be flexibly configured according to load intensity, operating frequency, and environmental conditions to ensure a safe and reliable fixing effect for the mounting plate 12.

[0071] As another implementation, to secure the mounting plate 12 as it moves out of the slide 15 located in the upper clamp 4, it is not only necessary to rely on the magnetic fixing structure. The stability of the mounting plate 12 after it is moved out can also be ensured by changing the way the connecting component engages with the slide 15. Specifically, the connecting piece 17 of the shaft used above can be replaced with a slider or boss structure that precisely matches the slide 15: the outer dimensions of the slider or boss are tightly fitted to the inner wall of the slide 15, with a very small sliding gap between them, to ensure smooth movement of the mounting plate 12 while providing effective limiting.

[0072] As the mounting plate 12 slides out of the clamping groove 10, the slider or boss is constrained by the sidewall of the slide groove 15, limiting its rotation or displacement. This mechanical limiting method ensures that the mounting plate 12 remains stable and vertical after being removed from the clamping groove 10, preventing rotation, displacement, or shaking. Operators can directly install materials onto the surface of the mounting plate 12 in the vertical direction. The tight contact between the inner wall of the slide groove 15 and the slider / boss provides reliable support for the mounting plate 12, ensuring positional accuracy and stability during material installation.

[0073] When the opposing clamps 4 are arranged laterally, and the connecting member 17 mentioned above is a slider or a boss, it can be directly installed in conjunction with the slide groove 15. During use, simply slide the mounting plate 12 out of the clamping groove 10 to perform material installation work on the mounting plate 12. In addition to the above-mentioned cooperation between the slider / boss and the slide groove 15, the mounting plate 12 can also adopt other sliding connection structures to realize the operation of moving the mounting plate 12 in and out of the clamping area.

[0074] To facilitate the movement of the mounting plate 12 within the clamping groove 10 and to enable quick movement of the mounting plate 12 in and out, a lever 24 is provided on the side wall of the mounting plate 12. This lever 24 can be integrally formed, secured to the mounting plate 12 with bolts, or otherwise, and its surface is treated with an anti-slip texture to effectively increase the friction between the fingers and the lever 24. During operation, the user can apply force to the lever 24 with their fingers or tools to achieve smooth sliding of the mounting plate 12.

[0075] In summary, before using this tensile testing device for material testing, the clamping length of the material end is determined according to the test requirements. The limiting edge 13 is adjusted to the target position by rotating the threaded rod 19 on the mounting plate 12.

[0076] Place one end of the material into the clamping groove 10 of the clamp 4, ensuring the material end is firmly against the limiting edge 13 to establish a clamping reference. Alternatively, remove the mounting plate 12 from the clamping groove 10, firmly abut the material end against the limiting edge 13, and smoothly mount it on the mounting plate 12. Then, use the clamping assembly to initially clamp one end of the material. Finally, move the mounting plate 12 to the preset position within the clamping groove 10.

[0077] At this point, move the clamping plate 11 toward the mounting plate 12 until the clamping plate 11 and the mounting plate 12 cooperate to securely clamp the material. Repeat the above steps to install the other end of the material onto another clamp 4, ensuring that the clamping force at both ends is uniform.

[0078] The drive unit is activated, controlling the two clamps 4 to move smoothly away in opposite directions. At this time, the force measuring device 5 collects the tensile force data of the material in real time and transmits the measurement results synchronously to the controller 1. The operator can monitor the tensile force change curve in real time through the controller 1 interface until the material reaches the fracture point or the preset tensile force threshold, at which point the test automatically stops.

[0079] The final tensile test result is read and recorded on controller 1. After the test, the clamp 4 is reset to the initial position by the drive device, so that the clamping plate 11 is away from the mounting plate 12 to remove the material, and the clamping groove 10 and mounting plate 12 are cleaned to prepare for the next test.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tensile testing device for material testing, comprising a frame (3), characterized in that: The frame (3) is equipped with oppositely arranged clamps (4) for clamping materials. The frame (3) is equipped with a drive device for driving the clamps (4) to move and adjust the distance between the two clamps (4). A force measuring device (5) is installed on the clamps (4). When the drive device drives the clamps (4) to move, the force measuring device (5) measures the tensile force of the material. The clamps (4) are provided with a clamping groove (10) inside. One side of the clamping groove (10) is provided with a clamping plate (11) whose position can be adjusted, and the other side is provided with a mounting plate (11). Mounting plate (12) is used to mount materials. By adjusting the clamping plate (11) to move closer to the mounting plate (12), the two cooperate to clamp the materials. The mounting plate (12) has a raised limiting edge (13) on the end face facing the clamping plate (11) to limit the installation position of the material end, so as to control the length of the material clamped by the clamping plate (11) and the mounting plate (12). The position of the limiting edge (13) can be adjusted to adjust the length of the material clamped by the clamping plate (11) and the mounting plate (12). A clamping assembly is installed on the limiting edge (13). The clamping assembly is used to clamp one end of the material. The clamping assembly is hinged to the limiting edge (13). The clamping assembly rotates in a fan shape with the plane where the mounting plate (12) is located as a reference and the hinge position as an axis to adjust the clamping position of the clamping assembly. The mounting plate (12) is movably installed in the clamping groove (10). By moving the mounting plate (12), the mounting plate (12) can be moved out of the clamping groove (10). The operating space is not limited by the clamping groove (10), which makes it convenient to lay and align the materials.

2. The tensile testing apparatus for material testing according to claim 1, characterized in that: A threaded rod (19) is installed on the mounting plate (12). The threaded rod (19) is connected to the limiting edge (13). Rotating the threaded rod (19) adjusts the position of the limiting edge (13).

3. The tensile testing apparatus for material testing according to claim 2, characterized in that: A mounting block (22) is fixedly provided on the other end face of the mounting plate (12). The threaded rod (19) is rotatably connected to the mounting block (22). A connecting block (20) is fixedly provided on the limiting edge (13). The connecting block (20) is threadedly connected to the threaded rod (19). A through groove (21) is provided on the mounting plate (12) for the connecting block (20) to pass through. A screwing block (23) for rotating the threaded rod (19) is provided on the threaded rod (19). A scale is marked on the mounting plate (12) for the limiting edge (13) to refer to.

4. The tensile testing apparatus for material testing according to claim 1, characterized in that: The clamping assembly includes a support frame (26), a support shaft (27) slidably connected to the support frame (26), and a spring (29) that provides elastic force to the support shaft (27). The end of the support shaft (27) facing the mounting plate (12) is provided with a stop block (28). The spring (29) is provided between the stop block (28) and the support frame (26), and the spring (29) is sleeved on the outside of the support shaft (27). The elastic force of the spring (29) causes the stop block (28) to press against the mounting plate (12) for clamping materials. The other end of the support shaft (27) is fixedly provided with a hand block (30). A connecting shaft (25) is installed on the limiting edge (13). The support frame (26) is rotatably connected to the connecting shaft (25). A positioning cylinder (31) is provided on the limiting edge (13). The stop block (28) enters into the positioning cylinder (31) for positioning the stop block (28). The positioning cylinder (31) is semi-circular.

5. The tensile testing apparatus for material testing according to claim 1, characterized in that: The mounting plate (12) and the clamp (4) are connected by a connecting assembly.

6. The tensile testing apparatus for material testing according to claim 5, characterized in that: The connecting assembly includes a mounting bracket (16) fixedly mounted on the mounting plate (12) and a connector (17) mounted on the mounting bracket (16). The clamp (4) has a mounting groove (14) for the mounting bracket (16) to move. The inner wall of the mounting groove (14) has a sliding groove (15). The connector (17) is installed in the sliding groove (15) and moves within the sliding groove (15).

7. The tensile testing apparatus for material testing according to claim 5 or 6, characterized in that: A magnet (35) for adsorbing the mounting plate (12) is installed in the clamping groove (10) of the clamp (4) described above. The magnet (35) adsorbs the mounting plate (12) to fix the mounting plate (12).

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