A tensile testing machine

Abstract

This utility model discloses a tensile testing machine, including a base, a lifting mechanism mounted on the upper part of the base, a sensor connected to the lifting mechanism, and fixed clamps fixedly connected to the sensor and the base, respectively. Each fixed clamp includes a slot seat, which is fixedly connected to the lower part of the sensor. Connecting frames are rotatably connected to both sides of the slot seat. A bidirectional lead screw and a guide rod are rotatably and fixedly connected to the two connecting frames, respectively. Two sliders of the bidirectional lead screw are rotatably connected to pressure rollers, and a slider is rotatably connected to the end of the pressure roller away from the bidirectional lead screw. The slider of the pressure roller is slidably connected to the guide rod. A worm gear is fixedly connected to the rotatable connection point of one connecting frame and the slot seat, and a worm is rotatably connected to the side of the slot seat, with the worm gear and worm meshing. This utility model clamps the sample at its upper and lower parts using the fixed clamps on the sensor and the base, respectively. By rotating the connecting frames, portions of the sample are wound around the two pressure rollers of the two fixed clamps, thereby fixing the sample more tightly and reducing testing errors.

Description

Technical Field

[0001] This utility model relates to the field of material performance testing technology, and in particular to a tensile testing machine. Background Technology

[0002] A tensile testing machine, also known as a universal material testing machine, is an instrument used to test the mechanical properties of various materials. It is suitable for tensile, compression, bending, and shear tests on a variety of materials such as fibers, plastics, rubber, and metals, and is widely used in industrial, scientific research, and educational fields.

[0003] When testing materials, the moving clamp and the fixed clamp on the testing machine are used to fix the materials. The moving clamp of the testing machine moves relative to the fixed clamp, thereby generating a pulling force on the materials. The materials are fixed by the friction generated when the two clamps clamp the materials. Therefore, the materials will slip on the clamps, which will affect the detection of the testing machine. Utility Model Content

[0004] The purpose of this invention is to provide a tensile testing machine to solve the above-mentioned problems.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A tensile testing machine includes a base, a lifting mechanism mounted on the upper part of the base, a mounting plate connected to the lifting mechanism, a sensor connected to the mounting plate, a fixed clamp connected to the sensor, and a fixed clamp with the same structure as the fixed clamp. The fixed clamp is fixedly connected to the base. The fixed clamp includes a slot, which is fixedly connected to the lower part of the sensor. A clamping mechanism is provided on the slot, and the clamping mechanism includes two connecting frames, which are rotatably connected to both sides of the slot. One connecting frame is fixedly connected to a guide rod, and the other connecting frame is rotatably connected to a bidirectional lead screw. The guide rod is slidably connected to two sliders, and the two sliders of the guide rod are respectively opposite to the two sliders of the bidirectional lead screw. A pressure roller is rotatably connected between the opposite bidirectional lead screw sliders and the guide rod sliders. A worm gear is fixedly connected to one of the connecting frames at its rotatable connection with the slot, and a worm is rotatably connected to the side of the slot, with the worm gear and worm meshing.

[0006] Using the above technical solution, the material sample to be tested is passed between the two pressure rollers of the two fixed clamps. First, the bidirectional screw of the second fixed clamp on the base is rotated. The bidirectional screw slider drives the two pressure rollers to move towards each other along the guide rod, bringing them closer together so that the two pressure rollers clamp the material between them. Then, the worm gear is rotated, which drives the worm wheel to rotate. The worm wheel drives the connecting frame to rotate, and the connecting frame drives the two pressure rollers to revolve as a whole, thereby winding a portion of the material onto the two pressure rollers. Then, the fixed clamp on the sensor clamps the other portion of the material and winds it onto the two pressure rollers above it. The lowering mechanism drives the sensor and its upper clamp to rise away from the clamp on the base, thereby causing the two clamps to exert a pulling force on the material. The material, under the pulling force, will tighten, thus wrapping tightly around the two pressure rollers on the clamps and preventing the material from slipping on the pressure rollers. At the same time, under the action of the worm gear, the pulling force between the material and the clamp will not pull the connecting frame to rotate relative to the slot seat, thereby preventing the fabric from moving and affecting the test. By wrapping the material around it, the contact area between the two is increased, thereby increasing the force of the pressure roller on the material sample, making the clamp fix the material sample more tightly.

[0007] Preferably, a rotating handle is fixedly connected to the end of the bidirectional lead screw.

[0008] The above technical solution facilitates the rotation of the bidirectional lead screw.

[0009] Preferably, the outer wall of the pressure roller is fitted with a rubber sleeve.

[0010] By adopting the above technical solution, the friction between the pressure roller and the material is increased, further preventing slippage between the pressure roller and the material.

[0011] Preferably, the clamping mechanism may include a clamping plate one and a clamping plate two. The clamping plate one is fixedly connected to two connecting frames on both sides, and the clamping plate two is rotatably connected to two connecting frames on both sides. Connecting columns are rotatably connected to the ends of the clamping plates one and two. The connecting columns on the clamping plate one have through holes, and the connecting columns on the clamping plate two have threaded holes. The threaded holes are located on the outer side of the ends of the connecting columns, and the central axes of the threaded holes and through holes are perpendicular to the central axis of the connecting columns. The mechanism also includes a screw rod located on the outer side of the ends of the two clamping plates. The screw rod passes through the through holes and threaded holes of the connecting columns of the two clamping plates. The screw rod is rotatably connected to the connecting columns of the clamping plate one and threadedly connected to the connecting columns of the clamping plate two.

[0012] Using the above technical solution, when the screw is turned, a force is generated between the screw and the connecting post of the second clamping plate. The force between the two causes both to rotate. At the same time, the screw and the connecting post of the clamping plate move relative to each other, and the second clamping plate moves closer to the first clamping plate, so that the two clamping plates clamp the material sample passing between them. Then, the worm is rotated, and the worm drives the worm wheel to rotate. The worm wheel drives the connecting frame to rotate, and the connecting frame drives the two clamping plates to rotate, so that part of the material sample is wrapped around its outer wall.

[0013] As a preferred option, rubber pads are fixed to the outer walls of clamp plate one and clamp plate two.

[0014] The above technical solution increases the friction between the clamp and the sample. Attached Figure Description

[0015] Figure 1 This is an overall schematic diagram of the embodiment; Figure 2 This is a front view diagram of an embodiment; Figure 3 This is a side view of an embodiment; Figure 4 This is a top view of the fixing clip; Figure 5 This is an overall schematic diagram of another embodiment; Figure 6 This is a front view of another embodiment; Figure 7 This is a schematic cross-sectional view along the AA direction; Figure 8 This is a schematic diagram of another clamping mechanism.

[0016] Reference numerals in the attached drawings: 1. Base; 2. Lifting mechanism; 3. Slot seat; 4. Connecting frame; 5. Guide rod; 6. Two-way lead screw; 7. Pressure roller; 8. Worm gear; 9. Worm; 10. Rotary handle; 11. Clamping plate one; 12. Clamping plate two; 13. Connecting column; 14. Screw. Detailed Implementation

[0017] The following description is merely a preferred embodiment of this utility model, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of this utility model should be considered within the protection scope of this utility model. It should also be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

[0018] See Figures 1 to 4A tensile testing machine includes a base 1, a lifting mechanism 2 mounted on the upper part of the base 1, a mounting plate connected to the lifting mechanism 2, a sensor connected to the mounting plate, and a fixing clamp 1 connected to the sensor. A fixing clamp 2 with the same structure as fixing clamp 1 is fixedly connected to the base 1. Fixing clamp 1 includes a slot 3, which is fixedly connected to the lower part of the sensor. A clamping mechanism is provided on the slot 3, including two connecting frames 4, which are rotatably connected to both sides of the slot 3. One connecting frame 4 is fixedly connected to a guide rod 5, and the other connecting frame 4 is rotatably connected to a bidirectional lead screw 6. Two sliders are slidably connected to the guide rod 5, and the two sliders of the guide rod 5 are respectively opposite to the two sliders of the bidirectional lead screw 6. A pressure roller 7 is rotatably connected between the opposing sliders of the bidirectional lead screw 6 and the sliders of the guide rod 5. A worm gear 8 is fixedly connected to one of the connecting frames 4 at its rotatable connection with the slot 3, and a worm 9 is rotatably connected to the side of the slot 3. The worm gear 8 and the worm 9 mesh with each other.

[0019] See Figures 5 to 8 The clamping mechanism can also consist of clamping plate 11 and clamping plate 12. Clamping plate 11 is fixedly connected to two connecting frames 4 on both sides, and clamping plate 12 is rotatably connected to two connecting frames 4 on both sides. Rubber pads are fixed to the outer walls of the two clamping plates. Connecting posts 13 are rotatably connected to the ends of clamping plates 11 and 12. The connecting post 13 on clamping plate 11 has a through hole, and the connecting post 13 on clamping plate 12 has a threaded hole. The threaded hole is located on the outer side of the end of the connecting post 13, and the central axis of the threaded hole and the through hole is perpendicular to the central axis of the connecting post 13. A screw 14 is also included. The screw 14 is located on the outer side of the ends of the two clamping plates. The screw 14 passes through the through hole and the threaded hole of the connecting post 13 of the two clamping plates. The screw 14 is rotatably connected to the connecting post 13 of clamping plate 11 and threadedly connected to the connecting post 13 of clamping plate 12. Rubber pads are fixed to the outer walls of clamping plates 11 and 12.

[0020] Working principle: The material sample to be tested passes between the two pressure rollers 7 of the two fixed clamps. First, rotate the bidirectional lead screw 6 of the fixed clamp on the base 1. The slider of the bidirectional lead screw 6 drives the two pressure rollers 7 to move towards each other along the guide rod 5, so that the two pressure rollers 7 clamp the material between them. Then, rotate the worm gear 9, which drives the worm wheel 8 to rotate. The worm wheel 8 drives the connecting frame 4 to rotate. The connecting frame 4 drives the two pressure rollers 7 to revolve as a whole, thereby winding a part of the material onto the two pressure rollers 7. Then, the fixed clamp on the sensor clamps the other part of the material and winds it onto the two pressure rollers 7 above it.

[0021] When using another clamping mechanism, screw 14 is turned, and a force is generated between screw 14 and the connecting post 13 of clamping plate 2 12. The force between the two causes both to rotate, and at the same time, screw 14 and the connecting post 13 of clamping plate move relative to each other. Clamping plate 2 12 moves closer to clamping plate 1 11, so that the two clamping plates clamp the material sample passing between them. Then, worm 9 is rotated, and worm 9 drives worm wheel 8 to rotate. Worm wheel 8 drives connecting frame 4 to rotate, and connecting frame 4 drives the two clamping plates to rotate, wrapping part of the material sample around its outer wall. Lifting mechanism 2 drives the sensor and its upper fixed clamp to rise away from the fixed clamp on the base 1, so that the two fixed clamps generate a pulling force on the material. The material will tighten under the pulling force, thereby wrapping the two pressure rollers 7 on the fixed clamp, preventing the material from slipping on the pressure rollers 7. At the same time, under the action of worm wheel 8 and worm 9, the pulling force between the material and the fixed clamp will not pull the connecting frame 4 to rotate relative to the slot seat 3, thereby preventing the fabric from moving and affecting the test. By wrapping the material around the pressure rollers 7, the contact area between the two is increased.

Claims

1. A tensile testing machine, comprising a base (1), a lifting mechanism (2) mounted on the upper part of the base (1), the lifting mechanism (2) being connected to a mounting plate, a sensor being connected to the mounting plate, the sensor being connected to a fixing clamp one, and a fixing clamp two having the same structure as the fixing clamp one being fixedly connected to the base (1), characterized in that, The fixed clamp includes a slot seat (3), which is fixedly connected to the lower part of the sensor. A clamping mechanism is provided on the slot seat (3). The clamping mechanism includes a connecting frame (4). There are two connecting frames (4), which are rotatably connected to both sides of the slot seat (3). One of the connecting frames (4) is fixedly connected to a guide rod (5), and the other connecting frame (4) is rotatably connected to a bidirectional lead screw (6). The guide rod (5) is slidably connected to two sliders. The two sliders of the guide rod (5) are respectively opposite to the two sliders of the bidirectional lead screw (6). A pressure roller (7) is rotatably connected between the opposing sliders of the bidirectional lead screw (6) and the sliders of the guide rod (5). One of the connecting frames (4) is fixedly connected to a worm gear (8) at its rotatable connection with the slot seat (3). A worm (9) is rotatably connected to the side of the slot seat (3). The worm gear (8) and the worm (9) mesh with each other.

2. The tensile testing machine according to claim 1, characterized in that, The end of the bidirectional lead screw (6) is fixedly connected to a rotating handle (10).

3. A tensile testing machine according to claim 1, characterized in that, The outer wall of the pressure roller (7) is fitted with a rubber sleeve.

4. A tensile testing machine according to claim 1, characterized in that, The clamping mechanism may include a clamping plate one (11) and a clamping plate two (12). The clamping plate one (11) is fixedly connected to two connecting frames (4) on both sides, and the clamping plate two (12) is rotatably connected to two connecting frames (4) on both sides. The ends of the clamping plate one (11) and the clamping plate two (12) are rotatably connected to connecting posts (13). The connecting posts (13) on the clamping plate one (11) have through holes, and the connecting posts (13) on the clamping plate two (12) have threads. The hole, the threaded hole is located on the outer side of the end of the connecting column (13), the central axis of the threaded hole and the through hole is perpendicular to the central axis of the connecting column (13), and also includes a screw (14), the screw (14) is located on the outer side of the end of the two clamping plates, the screw (14) passes through the through hole and the threaded hole of the connecting column (13) of the two clamping plates, the screw (14) is rotatably connected to the connecting column (13) of clamping plate one (11), and threadedly connected to the connecting column (13) of clamping plate two (12).

5. A tensile testing machine according to claim 4, characterized in that, Rubber pads are fixed to the outer walls of the first clamp (11) and the second clamp (12).

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