Anti-vibration clamping device for steel bar tensile test

Abstract

This utility model relates to the field of building material testing technology, and in particular to a vibration-proof clamping device for steel bar tensile testing. It includes a mounting base, a top cover plate, an adjusting base, a slider, and a clamping mechanism. The adjusting base is rotatably connected to the interior of the mounting base. A magnet is fixedly installed at the center of the upper end of the top cover plate. Four sets of sliding grooves are formed on the surface of the top cover plate. Four sets of arc-shaped grooves corresponding to the sliding grooves are formed on the upper surface of the adjusting base. The slider is positioned above the top cover plate, and a connecting rod is rotatably connected to the lower end of the slider. The connecting rod passes through the sliding grooves and extends into the arc-shaped grooves. Each set of sliders integrates a clamping mechanism. This utility model uses magnets to assist in positioning the steel bar sample. When the adjusting base rotates within the mounting base, the four sets of sliders move synchronously and stably along the radial direction of the mounting base through the cooperation of the arc-shaped grooves and the sliders, and by actuating the connecting rods. Combined with the clamping mechanism integrated within the sliders, this forms a multi-point clamping effect on the steel bar sample, effectively suppressing sample vibration.

Description

Technical Field

[0001] This utility model relates to the field of building material testing technology, and in particular to a vibration-proof clamping device for steel bar tensile testing. Background Technology

[0002] As an important load-bearing material in building structures, steel bars have mechanical properties that directly affect the safety and durability of buildings. Tensile testing is an important means of evaluating the mechanical properties of steel bars, and important parameters such as yield strength, tensile strength, and elongation can be obtained through tensile testing.

[0003] Currently, when conducting tensile tests on reinforcing bars, hydraulic wedge clamps or mechanical threaded clamps are commonly used to hold and fix the unmarked areas at both ends of the reinforcing bars. These traditional clamping systems can usually only apply unidirectional loads through two points on the surface of the reinforcing bars. In the initial stage of the test loading, due to the assembly gaps between the components of the test system and the load transfer hysteresis effect, the specimen often experiences slight longitudinal and transverse vibrations, affecting the initial data acquisition accuracy of precision measuring equipment such as extensometers.

[0004] Therefore, to address the above issues, a vibration-proof clamping device for steel bar tensile testing can be designed. This device employs a centering multi-point synchronous clamping mechanism, achieving precise axial alignment of the specimen through the application of multi-directional uniformly distributed loads. Simultaneously, it integrates magnets for auxiliary positioning, effectively suppressing micro-vibrations caused by mechanical gaps and dynamic load transmission during the initial loading stage. This improves the stability and measurement accuracy of the initial stage of test data acquisition. Utility Model Content

[0005] To overcome the problem that traditional clamping systems for rebar tensile testing can only apply unidirectional loads at two points on the rebar surface, and that slight longitudinal and lateral vibrations often occur in the specimen during the initial loading stage of the test due to assembly gaps between components and load transfer hysteresis, which affects the initial data acquisition accuracy of precision measuring equipment such as extensometers.

[0006] The technical solution of this utility model is as follows: a bar tensile test anti-vibration clamping device, including a mounting base, a top cover plate, an adjusting base, a slider, a driving mechanism, and a clamping mechanism. The top cover plate is located at the opening of the mounting base, and the adjusting base is rotatably connected to the interior of the mounting base. A magnet is fixedly installed at the center of the upper end of the top cover plate. Four sets of sliding grooves are evenly arranged circumferentially around the axis of the magnet on the surface of the top cover plate. Four sets of arc-shaped grooves corresponding to the sliding grooves are opened on the upper surface of the adjusting base. The slider is located above the top cover plate, and a connecting rod is rotatably connected to the lower end of the slider. The connecting rod passes through the sliding groove and extends into the interior of the arc-shaped groove. Each set of sliders integrates a clamping mechanism. The driving mechanism is located inside the mounting base.

[0007] Preferably, the slider is installed by setting an upper cover plate, and the end of the steel bar sample to be tested is positioned by setting a magnet. The adjustment seat is driven to rotate stably in the mounting seat by a drive mechanism. Through the cooperation between the arc groove and the slider, and by moving the connecting rod, the four sets of sliders slide synchronously and stably along the radial direction of the mounting seat. With the clamping mechanism integrated in the slider, a multi-point clamping effect is formed on the steel bar sample positioned by the magnet, which significantly improves the clamping stability and effectively suppresses the micro-amplitude vibration phenomenon generated in the early stage of test loading.

[0008] Preferably, the drive mechanism includes a worm wheel and a worm. The worm wheel is fixedly installed on the periphery of the adjusting seat, and the worm is rotatably connected to the inside of the mounting seat, with the worm wheel meshing with the worm.

[0009] Preferably, the drive mechanism includes a through hole and an internal hexagonal hole. The through hole is opened on the side wall of the mounting base, and one end of the worm is located inside the through hole. The worm has an internal hexagonal hole at one end.

[0010] Preferably, the clamping mechanism includes a U-shaped gripper that is hinged inside the slider.

[0011] Preferably, the clamping mechanism includes a flexible rubber pad and air chambers. Each set of U-shaped grippers has a flexible rubber pad on both end faces, and multiple air chambers are formed on the surface of the flexible rubber pad.

[0012] Preferably, multiple sets of bolts are provided between the mounting base and the upper cover plate, and the mounting base and the upper cover plate are fixed together by bolts.

[0013] Preferably, the mounting base is fixedly mounted with multiple sets of mounting ears, and the surface of the mounting ears is provided with through slotted holes.

[0014] The beneficial effects of this utility model are:

[0015] First, a magnet is used to assist in positioning the end of the steel bar sample to be tested. Then, the drive mechanism drives the adjusting seat to rotate stably within the mounting base. Through the cooperation between the arc groove and the slider, and by actuating the connecting rod, the four sets of sliders slide synchronously and stably along the radial direction of the mounting base. This allows the end face of the U-shaped gripper to contact the surface of the steel bar to be tested, further increasing the contact points with the steel bar. At the same time, a flexible rubber pad is used to compensate and cooperate with the U-shaped gripper to rotate hinged within the slider, adapting to steel bar samples with different surface textures. Furthermore, the air cavity on the surface of the flexible rubber pad will form a negative pressure adsorption effect during clamping, further enhancing the clamping stability and effectively suppressing the micro-vibration phenomenon caused by mechanical clearance and dynamic load transmission in the initial stage of loading, thereby improving the stability and measurement accuracy of the initial stage of test data acquisition. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of the anti-vibration clamping device for the tensile test of steel bars according to this utility model.

[0017] Figure 2 The diagram shown is an exploded three-dimensional structural illustration of the anti-vibration clamping device for steel bar tensile testing according to this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional structural representation of the mounting base of the anti-vibration clamping device for steel bar tensile testing according to this utility model.

[0019] Figure 4 The diagram shown is a three-dimensional structural schematic of the slider of the anti-vibration clamping device for steel bar tensile testing according to this utility model.

[0020] Figure 5 The diagram shown is an exploded three-dimensional structure of the upper cover plate of the anti-vibration clamping device for steel bar tensile testing of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Mounting base; 101. Bolt; 102. Mounting ear; 103. Strip hole; 2. Top cover plate; 201. Slide groove; 3. Adjusting seat; 301. Arc groove; 4. Slider; 401. Connecting rod; 501. Worm gear; 502. Worm; 503. Through hole; 504. Socket hexagonal hole; 601. U-shaped gripper; 602. Flexible rubber pad; 603. Air chamber; 7. Magnet. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please see Figure 1 , Figure 2 and Figure 5This utility model provides an embodiment of a steel bar tensile test anti-vibration clamping device, including a mounting base 1, an upper cover plate 2, an adjusting base 3, a slider 4, a driving mechanism, and a clamping mechanism. The upper cover plate 2 is disposed at the opening of the mounting base 1, and the adjusting base 3 is rotatably connected to the interior of the mounting base 1. A magnet 7 is fixedly installed at the center of the upper end of the upper cover plate 2. The surface of the upper cover plate 2 has four sets of grooves 201 evenly arranged circumferentially around the axis of the magnet 7. The upper surface of the adjusting base 3 has four sets of arc-shaped grooves 301 corresponding to the grooves 201. The slider 4 is disposed above the upper cover plate 2, and the lower end of the slider 4 is rotatably connected to a connecting rod 401, which passes through the grooves 201 and extends... Inside the arc groove 301, each set of sliders 4 integrates a clamping mechanism, and the drive mechanism is located inside the mounting base 1. The sliders 4 are installed by setting the upper cover plate 2, and the magnet 7 is used to achieve auxiliary positioning of the end of the steel bar sample to be tested. The drive mechanism drives the adjusting seat 3 to rotate stably in the mounting base 1. Through the cooperation between the arc groove 301 and the sliders 4, and by moving the connecting rod 401, the four sets of sliders 4 achieve synchronous and stable sliding along the radial direction of the mounting base 1. With the clamping mechanism integrated in the sliders 4, a multi-point clamping effect is formed on the steel bar sample assisted in positioning by the magnet 7, which significantly improves the clamping stability and effectively suppresses the micro-amplitude vibration phenomenon generated in the early stage of test loading.

[0024] Please see Figure 2 and Figure 3 In this embodiment, the driving mechanism includes a worm gear 501 and a worm 502. The worm gear 501 is fixedly installed on the periphery of the adjusting seat 3, and the worm 502 is rotatably connected to the interior of the mounting seat 1. The worm gear 501 meshes with the worm 502. The driving mechanism includes a through hole 503 and an internal hexagonal hole 504. The through hole 503 is opened in the side wall of the mounting seat 1, and one end of the worm 502 is located inside the through hole 503. The internal hexagonal hole 504 is opened at one end of the worm 502. By inserting a standard internal hexagonal wrench or other common tool into the internal hexagonal hole 504, the worm 502 can be easily driven to rotate. Then, the torque is transmitted to the adjusting seat 3 through the worm gear 501, so as to realize the stable rotation of the adjusting seat 3 in the mounting seat 1. At the same time, by setting the internal hexagonal hole 504 inside the through hole 503, the worm 502 can be effectively prevented from being accidentally touched. The worm 502 and the worm gear 501 are self-locking.

[0025] Please see Figure 4 and Figure 5In this embodiment, the clamping mechanism includes a U-shaped gripper 601, which is hinged inside the slider 4. The clamping mechanism includes a flexible rubber pad 602 and an air cavity 603. Each set of U-shaped grippers 601 has a flexible rubber pad 602 on both end faces, and multiple sets of air cavities 603 are formed on the surface of the flexible rubber pad 602. By setting the U-shaped gripper 601, the contact points with the steel bar can be further increased. By setting the flexible rubber pad 602 to compensate and cooperate with the U-shaped gripper 601 to rotate hinged in the slider 4, it can adapt to steel bar samples with different surface textures. At the same time, the air cavity 603 forms a negative pressure adsorption effect during clamping, which further enhances the clamping stability.

[0026] Please see Figure 1 and Figure 2 In this embodiment, multiple sets of bolts 101 are provided between the mounting base 1 and the upper cover plate 2; the mounting base 1 and the upper cover plate 2 are connected and fixed by the bolts 101, which facilitates disassembly and maintenance; multiple sets of mounting ears 102 are fixedly installed on the periphery of the mounting base 1, and the surface of the mounting ears 102 is provided with through slotted holes 103; by providing mounting ears 102 and slotted holes 103, the mounting base 1 can be fixedly installed in a suitable position on the test equipment.

[0027] During operation, magnet 7 is used to assist in positioning the end of the steel bar sample to be tested. Then, a standard hex wrench or other general-purpose tool is inserted into the hex socket 504 to easily drive the worm gear 502 to rotate. The torque is then transmitted to the adjusting seat 3 through the worm wheel 501, so that the adjusting seat 3 can rotate stably in the mounting seat 1.

[0028] When the adjusting seat 3 rotates stably within the mounting seat 1, the arc groove 301 cooperates with the slider 4. The connecting rod 401 is also activated, enabling the four sets of sliders 4 to slide synchronously and stably along the radial direction of the mounting seat 1. This allows the end faces of the U-shaped grippers to contact the surface of the steel bar to be tested, further increasing the contact points with the steel bar. Simultaneously, the flexible rubber pad 602 compensates for and cooperates with the U-shaped grippers 601 as they rotate hinged within the slider 4, adapting to steel bar samples with different surface textures. Furthermore, the air cavities 603 on the surface of the flexible rubber pad 602 create a negative pressure adsorption effect during clamping, further enhancing clamping stability.

[0029] It effectively suppresses micro-vibration phenomena caused by mechanical clearance and dynamic load transmission in the initial stage of loading, thereby improving the stability and measurement accuracy of the initial stage of test data acquisition.

[0030] Through the above steps, the magnet 7 is used to assist in positioning the end of the steel bar sample to be tested. When the adjusting seat 3 rotates in the mounting seat 1, the arc groove 301 cooperates with the slider 4 and moves the connecting rod 401 to achieve synchronous and stable sliding of the four sliders 4 along the radial direction of the mounting seat 1. With the clamping mechanism integrated in the slider 4, a multi-point clamping effect is formed on the steel bar sample positioned by the magnet 7, which significantly improves the clamping stability and effectively suppresses the micro-amplitude vibration phenomenon generated in the early stage of test loading. This solves the problem that the traditional clamping system of steel bar tensile test can usually only apply unidirectional load through two points on the surface of the steel bar. In the initial stage of test loading, due to the assembly gap between the components of the test system and the load transmission lag effect, the sample often experiences slight longitudinal and transverse vibration, which affects the initial data acquisition accuracy of precision measuring equipment such as extensometers.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A vibration-proof clamping device for tensile testing of reinforcing bars, comprising a mounting base (1), characterized in that: It also includes an upper cover plate (2), an adjusting seat (3), a slider (4), a driving mechanism and a clamping mechanism. The upper cover plate (2) is located at the opening of the mounting base (1). The adjusting seat (3) is rotatably connected to the interior of the mounting base (1). A magnet (7) is fixedly installed at the center of the upper end of the upper cover plate (2). Four sets of sliding grooves (201) are evenly arranged around the axis of the magnet (7) on the surface of the upper cover plate (2). Four sets of arc grooves (301) corresponding to the sliding grooves (201) are opened on the upper surface of the adjusting seat (3). The slider (4) is located above the upper cover plate (2). The lower end of the slider (4) is rotatably connected to a connecting rod (401). The connecting rod (401) passes through the sliding groove (201) and extends into the interior of the arc groove (301). Each set of sliders (4) has a clamping mechanism integrated inside. The driving mechanism is located inside the mounting base (1).

2. The anti-chattering gripping device for a reinforcing bar tensile test according to claim 1, characterized in that: The drive mechanism includes a worm wheel (501) and a worm (502). The worm wheel (501) is fixedly installed on the periphery of the adjusting seat (3), and the worm (502) is rotatably connected to the inside of the mounting seat (1). The worm wheel (501) meshes with the worm (502).

3. The anti-chattering gripping device for steel bar tensile test according to claim 2, characterized in that: The drive mechanism includes a through hole (503) and an internal hexagonal hole (504). The through hole (503) is opened on the side wall of the mounting base (1). One end of the worm (502) is located inside the through hole (503), and the internal hexagonal hole (504) is opened at one end of the worm (502).

4. The anti-chattering gripping device for a reinforcing bar tensile test according to claim 1, characterized in that: The clamping mechanism includes a U-shaped gripper (601), which is hinged to the inside of the slider (4).

5. The anti-hunting clamping device for tensile testing of reinforcing bars according to claim 4, characterized in that: The clamping mechanism includes a flexible rubber pad (602) and an air chamber (603). Each set of U-shaped grippers (601) has a flexible rubber pad (602) on both end faces, and multiple sets of air chambers (603) are formed on the surface of the flexible rubber pad (602).

6. The anti-chattering gripping device for steel bar tensile test according to claim 1, characterized in that: Multiple sets of bolts (101) are provided between the mounting base (1) and the upper cover plate (2), and the mounting base (1) and the upper cover plate (2) are fixed together by bolts (101).

7. The anti-vibration clamping device for steel bar tensile testing according to claim 1, characterized in that: The mounting base (1) has multiple sets of mounting ears (102) fixedly installed on its periphery, and the surface of the mounting ears (102) is provided with through strip holes (103).

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