Device for detecting elongation of steel bar in tensile test

Abstract

The utility model provides a steel bar tensile test elongation detection device, which comprises a detection table, an adjusting mechanism, a deformation detection mechanism and a clamp, end plates are welded at the two ends of the surface of the detection table, a hole is formed in the middle of each end plate, a hydraulic rod is inserted into the hole, and the hydraulic rod is connected with the clamp. The end plate is provided with a hydraulic rod, the tail end of the hydraulic rod is in threaded connection with the clamp part, a stand column is welded to the top of the end plate, an adjusting mechanism is arranged at the top end of the stand column, and a plurality of deformation detection mechanisms are installed in the middle of the adjusting mechanism. The effectiveness of the final experiment result is judged, the multiple deformation detection mechanisms can synchronously abut against the surface of the to-be-detected reinforcing steel bar, the specific deformation area and range on the to-be-detected reinforcing steel bar can be efficiently judged, and the device can be suitable for detection of reinforcing steel bars of different specifications and types.

Description

Technical Field

[0001] This utility model relates to the field of steel bar tensile testing technology, specifically to a device for detecting the elongation rate of steel bar tensile tests. Background Technology

[0002] Tensile testing of reinforcing bars is a crucial step in determining their strength. This test allows us to understand the mechanical behavior of the bars under pure tensile stress, grasp the various stages of the tensile process, and assess their quality. According to existing technology, such as the reinforcing bar quality tensile testing device disclosed in Chinese Patent Document CN209784065U, the technical solution, by incorporating a first cylinder, a vertical rod, a first telescopic rod, a first slider, and a testing device, solves the problems of time-consuming, labor-intensive, and physically demanding processes in reinforcing bar tensile testing. This improves work quality and efficiency, and also avoids the possibility of injury from the reinforcing bars during the testing process.

[0003] According to its publicly available technical solutions, in the existing technology for the tensile test of steel bars, after clamping both ends of the steel bar to be tested, when applying tension, it is easy to cause the clamping area of ​​the steel bar to slip. This problem will cause inaccurate experimental results. On the other hand, in the conventional elongation test, it is difficult to quickly and efficiently determine the specific area and range of deformation on the steel bar to be tested. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a detection device for the elongation rate of steel bar tensile tests, thereby solving the problems mentioned in the background art. This invention can promptly detect slippage in the clamping area during subsequent testing, and determine the validity of the final experimental results. By using multiple deformation detection mechanisms to simultaneously press against the surface of the steel bar under test, the specific area and range of deformation on the steel bar under test can be efficiently determined. It can be applied to the testing of steel bars of different specifications and types.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a testing device for the elongation rate of steel bar tensile tests, comprising a testing device body, the testing device body including a testing platform, an adjustment mechanism, a deformation detection mechanism, and a clamp, end plates welded at both ends of the surface of the testing platform, each end plate having a hole in the middle, a hydraulic rod inserted inside the hole, the end of the hydraulic rod being screwed to the clamp, a column welded to the top of the end plate, an adjustment mechanism provided at the top of the column, and multiple deformation detection mechanisms installed in the middle of the adjustment mechanism.

[0006] Furthermore, the clamp includes a connecting plate, a top clamping plate, and a bottom clamping plate. The inner sides of the top clamping plate and the bottom clamping plate are provided with arc-shaped clamping grooves. The top of the top clamping plate is integrally formed with a lifting block, and the surface of the connecting plate is provided with a lifting groove.

[0007] Furthermore, one end of the hydraulic rod is screwed to the back of the connecting plate, and the sides of the top clamping plate and the bottom clamping plate are integrally formed with fixing plates. The top clamping plate and the bottom clamping plate are assembled and connected by bolts passing through the fixing plates.

[0008] Furthermore, the bottom clamping plate has an integrally formed connecting column at its end, the end of which is welded to the surface of the connecting plate. A pressure sensor is also screwed onto the surface of the connecting plate. The pressure sensor is located in the middle area between the two connecting columns. The reinforcing bar to be tested passes through the inside of the clamping groove. The clamps are installed symmetrically at both ends of the testing table surface.

[0009] Furthermore, the adjustment mechanism includes a column, a threaded sleeve, and a positioning plate. The threaded sleeve is fitted onto the surface of the column, a top plate is welded to the side of the column, a support frame is inserted into the bottom of the top plate, and a laser ranging module or a reflector is screwed to the end of the support frame.

[0010] Furthermore, the laser ranging module and the reflector are on the same horizontal straight line, the surface of the column is provided with external threads, the two ends of the positioning plate are sleeved on the surface of the column, and the threaded sleeve rests against the bottom of the positioning plate.

[0011] Furthermore, the deformation detection mechanism includes a plug rod, a collar, and a baffle. The collar is sleeved on the surface of the plug rod, and the plug rod passes through the surface of the positioning plate.

[0012] Furthermore, the collar has an extension rod integrally formed on its side, a baffle integrally formed at the end of the extension rod, and an anti-slip pad is attached to the inner side of the collar.

[0013] The beneficial effects of this utility model are:

[0014] 1. The device for detecting the elongation rate of steel bar tensile test uses clamping structures at both ends of the bottom to clamp and fix the two ends of the steel bar to be tested. A pressure sensor is installed inside the clamp. By using this structure to maintain a fixed pressure value on the pressure sensor before clamping and fixing the steel bar to be tested, the phenomenon of slippage in the clamping area can be detected in time during the subsequent test, and the validity of the final experimental results can be judged.

[0015] 2. The device for detecting the elongation rate of steel bar tensile tests can detect slight deformation on the surface of the steel bar by means of a deformation detection mechanism installed at the top. At the same time, by using multiple deformation detection mechanisms to simultaneously press against the surface of the steel bar, the specific area and range of deformation on the steel bar can be efficiently determined.

[0016] 3. The device for detecting the elongation rate of steel bar tensile tests is supported at both ends of the deformation detection mechanism by adjustment mechanisms. With the help of adjustment mechanisms, each deformation detection mechanism can achieve positioning. Therefore, for different types of steel bars to be tested, even if the surface of the steel bars to be tested has different textures, it can still ensure that the area at the top for detecting deformation is kept on the same straight line, thus making it suitable for testing steel bars of different specifications and types. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the device for detecting the elongation rate of steel bar tensile tests according to this utility model;

[0018] Figure 2 This is a schematic diagram of the fixture part of this utility model;

[0019] Figure 3 This is an exploded view of the fixture of this utility model;

[0020] Figure 4 This is a schematic diagram showing the installation of the adjustment mechanism and deformation detection mechanism of this utility model;

[0021] Figure 5 This is a schematic diagram of the deformation detection mechanism of this utility model;

[0022] Figure 6 This is a schematic diagram of the adjustment mechanism of this utility model;

[0023] In the diagram: 1. Detection platform; 2. End plate; 3. Fixture; 4. Adjustment mechanism; 5. Deformation detection mechanism; 6. Positioning plate; 7. Connecting plate; 8. Top clamping plate; 9. Bottom clamping plate; 10. Pressure sensor; 11. Hydraulic rod; 12. Fixing plate; 13. Lifting block; 14. Connecting column; 15. Lifting groove; 16. Clamping groove; 17. Insertion rod; 18. Collar; 19. Anti-slip pad; 20. Extension rod; 21. Baffle; 22. Column; 23. Top plate; 24. Threaded sleeve; 25. Support frame; 26. Laser ranging module; 27. Reflector. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] Please see Figures 1 to 6 This utility model provides the following technical solution: a testing device for the elongation rate of steel bars in tensile tests, comprising a testing device body, the testing device body including a testing platform 1, an adjustment mechanism 4, a deformation detection mechanism 5, and a clamp 3. End plates 2 are welded to both ends of the surface of the testing platform 1, and each end plate 2 has a hole in the middle. A hydraulic rod 11 is inserted into the hole, and the end of the hydraulic rod 11 is screwed to the clamp 3. A column 22 is welded to the top of the end plate 2, and an adjustment mechanism 4 is provided at the top of the column 22. Multiple deformation detection mechanisms 5 are installed in the middle of the adjustment mechanism 4. This testing device is used to test the elongation rate of the steel bars to be tested.

[0026] When using this invention, after cutting the reinforcing bar to be tested to a preset length, the clamps 3 at both ends are opened, and the reinforcing bar to be tested can be placed directly inside the clamps 3. The outer ends of the hydraulic rods 11 at both ends of the device are screwed to the external support equipment. By controlling the hydraulic rods 11 to push the clamps 3 to move until the two ends of the reinforcing bar to be tested contact the pressure sensors 10 at both ends and generate pressure, the clamps 3 can be manually controlled to clamp the two ends of the reinforcing bar to be tested. Then, the adjustment mechanism 4 controls each deformation detection mechanism 5 at the top to press down against the top of the surface of the reinforcing bar to be tested, and moves each extension rod 20 and baffle 21 on the reinforcing bar to be tested to the same height and pointing upward. Then, the adjustment mechanism 4 is controlled to move the positioning plate 6 down to release the obstruction, and the hydraulic rods 11 at both ends can be activated to stretch the reinforcing bar to be tested. The laser ranging module 26 determines whether deformation has occurred and the specific deformation area.

[0027] In this embodiment, the clamp 3 includes a connecting plate 7, a top clamping plate 8, and a bottom clamping plate 9. Both the top clamping plate 8 and the bottom clamping plate 9 have arc-shaped clamping grooves 16 on their inner sides. A lifting block 13 is integrally formed at the top of the top clamping plate 8, and a lifting groove 15 is formed on the surface of the connecting plate 7. One end of the hydraulic rod 11 is screwed to the back of the connecting plate 7. A fixing plate 12 is integrally formed on the sides of the top clamping plate 8 and the bottom clamping plate 9, and the top clamping plate 8 and the bottom clamping plate 9 are joined together by bolts passing through the fixing plate 12. A connecting column 14 is integrally formed at the end of the bottom clamping plate 9, and the end of the connecting column 14 is welded to the surface of the connecting plate 7. A pressure sensor 10 is also screwed to the surface of the connecting plate 7. The pressure sensor 10 is located in the middle area between the two connecting columns 14. The reinforcing bar to be tested passes through the inside of the clamping groove 16. The clamp 3 is symmetrically installed at both ends of the surface of the testing table 1. The two ends of the reinforcing bar to be tested are clamped and fixed by the clamps 3 at both ends of the bottom. A pressure sensor 10 is installed inside the clamp 3. By using this structure to maintain a fixed pressure value on the pressure sensor 10 when installing the reinforcing bar to be tested, the phenomenon of slippage in the clamping area can be detected in time during subsequent testing, and the validity of the final experimental results can be judged.

[0028] Specifically, the arc-shaped clamping grooves 16 on the inner sides of the top clamping plate 8 and the bottom clamping plate 9 are used to clamp the two ends of the steel bar to be tested. The external bolts pass through the fixing plate 12 to complete the locking and clamping process of the clamp 3. After clamping, the external hydraulic rod 11 is activated to pull the entire connecting plate 7 to move, which can stretch the two ends of the steel bar to be tested after clamping. When slippage occurs between the clamp 3 and the steel bar to be tested, the pressure sensor 10 at both ends can be used to determine that slippage has occurred by the decrease in the value or loss of pressure.

[0029] In this embodiment, the adjustment mechanism 4 includes a column 22, a threaded sleeve 24, and a positioning plate 6. The threaded sleeve 24 is fitted onto the surface of the column 22, and a top plate 23 is welded to the side of the column 22. A support frame 25 is inserted into the bottom of the top plate 23, and a laser ranging module 26 or a reflector 27 is screwed to the end of the support frame 25. The laser ranging module 26 and the reflector 27 are on the same horizontal line. The surface of the column 22 is provided with external threads, and both ends of the positioning plate 6 are fitted onto the surface of the column 22. The threaded sleeve 24 rests against the bottom of the positioning plate 6. The deformation detection mechanism 5 is supported at both ends by the adjustment mechanism 4. The adjustment mechanism 4 works with each deformation detection mechanism 5 to achieve the purpose of positioning. Therefore, for different types of steel bars to be tested, even if there are different textures on the surface of the steel bars to be tested, it can still ensure that the area at the top used for detecting deformation is kept on the same straight line. This makes it suitable for testing steel bars of different specifications and types. Specifically, by controlling the threaded sleeve 24, the top positioning plate 6 can be lifted up until the positioning plate 6 touches the top plate 23, and the positioning process is completed. At this time, the extension rod 20 in each deformation detection mechanism 5 is manually pressed down until it is completely pressed to the top of the positioning plate 6, so that each baffle 21 is on the same straight line.

[0030] In this embodiment, the deformation detection mechanism 5 includes a plug-in rod 17, a collar 18, and a baffle 21. The collar 18 is sleeved on the surface of the plug-in rod 17, and the plug-in rod 17 passes through the surface of the positioning plate 6. An extension rod 20 is integrally formed on the side of the collar 18, and a baffle 21 is integrally formed at the end of the extension rod 20. An anti-slip pad 19 is attached to the inner side of the collar 18. The deformation detection mechanism 5 installed at the top can detect slight deformation on the surface of the reinforcing bar to be tested. At the same time, by using multiple deformation detection mechanisms 5 simultaneously pressing against the surface of the reinforcing bar to be tested, the specific area and range of deformation on the reinforcing bar to be tested can be efficiently determined.

[0031] After each baffle 21 is moved to the same horizontal height by the adjustment mechanism 4, each plug rod 17 is moved down until the bottom of each plug rod 17 abuts against different positions on the top of the steel bar to be tested. Even if there are textures on the surface of the steel bar to be tested, multiple tapered plug rods 17 can abut against the corresponding textured surface. After positioning, the threaded sleeve 24 is rotated to move the positioning plate 6 down. After stretching, once the surface of the steel bar to be tested is deformed and depressed, the plug rod 17 corresponding to the top of the depressed area will move down. At this time, since the positioning plate 6 has lost its obstruction of the extension rod 20, the extension rod 20 and the baffle 21 can be moved down by the anti-slip pad 19. The laser beam emitted by the side laser ranging module 26 is blocked by the lowered baffle 21. The specific depression position on the steel bar to be tested can be determined according to the change in the measured distance data.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A testing device for the elongation rate of steel bars in tensile tests, comprising a testing device body, characterized in that: The detection device body includes a detection platform (1), an adjustment mechanism (4), a deformation detection mechanism (5), and a fixture (3). End plates (2) are welded to both ends of the surface of the detection platform (1). Each end plate (2) has a hole in the middle, and a hydraulic rod (11) is inserted inside the hole. The end of the hydraulic rod (11) is screwed to the fixture (3). A column (22) is welded to the top of the end plate (2). An adjustment mechanism (4) is set at the top of the column (22). Multiple deformation detection mechanisms (5) are installed in the middle of the adjustment mechanism (4).

2. The device for detecting the elongation of steel bars in tensile tests according to claim 1, characterized in that: The clamp (3) includes a connecting plate (7), a top clamp (8) and a bottom clamp (9). The inner sides of the top clamp (8) and the bottom clamp (9) are provided with arc-shaped clamping grooves (16). The top of the top clamp (8) is integrally formed with a lifting block (13). The surface of the connecting plate (7) is provided with a lifting groove (15).

3. The device for detecting the elongation of steel bars in tensile tests according to claim 2, characterized in that: One end of the hydraulic rod (11) is screwed to the back of the connecting plate (7). The top clamping plate (8) and the bottom clamping plate (9) are integrally formed with a fixing plate (12) on their sides. The top clamping plate (8) and the bottom clamping plate (9) are connected by bolts passing through the fixing plate (12).

4. The device for detecting the elongation of steel bars in tensile tests according to claim 3, characterized in that: The bottom clamping plate (9) has an integrally formed connecting column (14) at its end. The end of the connecting column (14) is welded to the surface of the connecting plate (7). A pressure sensor (10) is also screwed onto the surface of the connecting plate (7). The pressure sensor (10) is set in the middle area of ​​the two connecting columns (14). The reinforcing bar to be tested passes through the inside of the clamping groove (16). The clamp (3) is installed symmetrically at both ends of the surface of the testing table (1).

5. The device for detecting the elongation of steel bars in tensile tests according to claim 2, characterized in that: The adjustment mechanism (4) includes a column (22), a threaded sleeve (24) and a positioning plate (6). The surface of the column (22) is fitted with a threaded sleeve (24). A top plate (23) is welded to the side of the column (22). A support frame (25) is inserted into the bottom of the top plate (23). A laser ranging module (26) or a reflector (27) is screwed to the end of the support frame (25).

6. The device for detecting the elongation of steel bars in tensile tests according to claim 5, characterized in that: The laser ranging module (26) and the reflector (27) are on the same horizontal line. The surface of the column (22) is provided with external threads. The two ends of the positioning plate (6) are sleeved on the surface of the column (22). The threaded sleeve (24) rests against the bottom of the positioning plate (6).

7. The device for detecting the elongation of steel bars in tensile tests according to claim 5, characterized in that: The deformation detection mechanism (5) includes a plug rod (17), a collar (18) and a baffle (21). The collar (18) is fitted on the surface of the plug rod (17), and the plug rod (17) passes through the surface of the positioning plate (6).

8. The device for detecting the elongation of steel bars in tensile tests according to claim 7, characterized in that: The collar (18) has an extension rod (20) integrally formed on its side, and a baffle (21) integrally formed at the end of the extension rod (20). An anti-slip pad (19) is attached to the inner side of the collar (18).

Images