A centering device for steel bar tensile test
By using an elastic rope and contact sensor in the steel bar tensile testing device, the offset of the steel bar center point is monitored in real time, which solves the problem of uneven stress on both sides of the steel bar and achieves the accuracy and adaptability of the test results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG XINZE ENG TESTING CO LTD
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-31
AI Technical Summary
In steel bar tensile tests, existing techniques cannot guarantee uniform and symmetrical force application on both sides of the steel bar, resulting in uneven deformation and affecting the accuracy of the test results.
The device includes a base, a first clamp, a second clamp, a lead screw motor, a positioning assembly, and a controller. It contacts the reinforcing bar with an elastic rope, monitors the deviation of the center point of the reinforcing bar in real time, and uses contact sensors and alarms to ensure uniform force distribution, adapting to the needs of reinforcing bars of different sizes.
It improves the accuracy of steel bar tensile tests, ensures the precision of test results, and can promptly alert to uneven stress conditions, adapting to the use of steel bars of different sizes.
Smart Images
Figure CN224581275U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of testing equipment technology, and in particular to a centering device for tensile testing of reinforcing bars. Background Technology
[0002] Before steel bars are put into use, the batch of steel bars usually needs to be sampled and tested. The test contents include strength, hardness, tensile strength, etc. Especially when testing the tensile strength of the material, it is necessary to ensure that the force is applied evenly and symmetrically on both sides of the material. If the tensile force applied on both sides is different, the deformation of the steel bar will be uneven, which may affect the structure of the tensile test. Therefore, a device is needed to ensure that the offset of the center point of the steel bar can be observed by the naked eye during the tensile process and is within the error range. Summary of the Invention
[0003] To address the aforementioned problems, this utility model provides a centering device for steel bar tensile testing that can ensure real-time monitoring of steel bar tensile dynamics, adapt to tests of steel bars of different sizes, and improve the accuracy of tensile test results.
[0004] The technical solution of this utility model is as follows: A centering device for a rebar tensile test includes a device base, a first clamp connected to the device base, a second clamp slidably connected to the device base, a first lead screw motor for driving the first clamp, a second lead screw motor for driving the second clamp, a positioning component connected to the device base, and a controller. The positioning component includes a first positioning base connected to the device base, a second positioning base connected to the device base, and an elastic rope connecting the first positioning base and the second positioning base. When the first clamp and the second clamp are in the initial state, the central axis of the first positioning base and the second positioning base are in the same vertical plane as the axis of symmetry of the first clamp and the second clamp. When the two ends of the rebar to be tested are respectively clamped on the first clamp and the second clamp, the elastic rope maintains contact with the rebar to be tested. The controller is electrically connected to the first lead screw motor and the second lead screw motor respectively.
[0005] Using the above technical solution, firstly, the two ends of the reinforcing bar to be tested are fixed to the first clamp and the second clamp, respectively. A measuring tool is used to ensure that the elastic rope and the central axis of the reinforcing bar are in the same vertical plane. Then, the lower surface of the elastic rope can be wrapped around the reinforcing bar, or the upper surface of the reinforcing bar can be kept in contact with the elastic rope. Then, the controller controls the first and second lead screw motors to drive the first and second clamps to move in opposite directions. The operator can observe whether the elastic rope deforms. Because the elastic rope has a certain elasticity and maintains contact with the center point of the reinforcing bar, if the reinforcing bar is stretched unevenly, the center point will shift, causing the elastic rope to deform to a certain extent. This provides a more intuitive way for the operator to observe whether the reinforcing bar is evenly stressed, thereby improving the accuracy of the tensile test. A further feature of this invention is that the equipment base is equipped with several connecting rods, and the elastic rope sequentially wraps around each connecting rod.
[0006] By employing the above technical solution, since the elastic rope passes around each connecting rod sequentially, it can be ensured that the elastic rope remains taut. This further ensures that when the center point of the reinforcing bar shifts, the elastic rope can deform precisely accordingly, thereby guaranteeing the accuracy of the reinforcing bar tensile test results. A further feature of this invention is that both the first and second positioning bases are equipped with telescopic rods, and the two ends of the elastic rope are respectively fixedly connected to the two telescopic rods.
[0007] By adopting the above technical solution, since both the first positioning base and the second positioning base are equipped with telescopic rods, the telescopic rods can extend and retract to a certain extent, thereby improving the height of the elastic rope so that it can be matched with the position of the reinforcing bar to be tested, and the elastic rope can maintain contact with the reinforcing bar. This device can adapt to the needs of reinforcing bars of different sizes.
[0008] Further features of this invention: The device base is also equipped with a contact sensor and an alarm. There are two contact sensors. When the elastic rope is in the initial state, the two contact sensors are symmetrically arranged with the elastic rope as the axis of symmetry. The height of the two contact sensors is adapted to the height of the elastic rope. The distance between the two contact sensors is less than 1 cm. The controller is electrically connected to the contact sensors and the alarm respectively.
[0009] Using the above technical solution, since the two contact sensors are symmetrically arranged about the elastic rope as the axis of symmetry when the elastic rope is in its initial state, and the distance between the two contact sensors is less than 1 cm, when the tension at both ends of the steel bar is uneven, causing uneven deformation of the steel bar, the elastic rope will also deform accordingly. When the elastic rope comes into contact with one of the contact sensors, the contact sensor sends an electrical signal to the controller. The controller controls the alarm to sound an alarm and controls the first lead screw motor and the second lead screw motor to stop working, so that the staff can check the problem and avoid deviations in the steel bar tensile test results. Attached Figure Description
[0010] Appendix Figure 1 This is a schematic diagram of a centering device for a steel bar tensile test according to a specific embodiment of the present invention.
[0011] 1-Equipment base, 2-First chuck, 3-Second chuck, 4-First lead screw motor, 5-Second lead screw motor, 6-Positioning component, 7-Controller, 8-First positioning base, 9-Second positioning base, 10-Elastic rope, 11-Connecting rod, 12-Telescopic rod, 13-Contact sensor, 14-Alarm. Detailed Implementation
[0012] like Figure 1As shown, a centering device for a rebar tensile test includes a base 1, a first clamp 2 connected to the base 1, a second clamp 3 slidably connected to the base 1, a first lead screw motor 4 for driving the first clamp 2, a second lead screw motor 5 for driving the second clamp 3, a positioning component 6 connected to the base 1, and a controller 7. The positioning component 6 includes a first positioning base 8 connected to the base 1, a second positioning base 9 connected to the base 1, and an elastic rope 10 connecting the first positioning base 8 and the second positioning base 9. When the first clamp 2 and the second clamp 3 are in the initial state, the central axis of the first positioning base 8 and the second positioning base 9 are in the same vertical plane as the axis of symmetry of the first clamp 2 and the second clamp 3. When the two ends of the rebar to be tested are respectively clamped on the first clamp 2 and the second clamp 3, the elastic rope 10 keeps in contact with the rebar to be tested. The controller 7 is electrically connected to the first lead screw motor 4 and the second lead screw motor 5. First, fix both ends of the reinforcing bar to be tested onto the first clamp 2 and the second clamp 3, respectively. A measuring tool can be used to ensure that the elastic rope 10 and the central axis of the reinforcing bar are in the same vertical plane. Then, the lower surface of the elastic rope 10 can be wrapped around the reinforcing bar, or the upper surface of the reinforcing bar can be kept in contact with the elastic rope 10. Then, the controller 7 controls the first lead screw motor 4 and the second lead screw motor 5 to drive the first clamp 2 and the second clamp 3 in opposite directions, respectively. The operator can observe whether the elastic rope 10 deforms. Because the elastic rope 10 has a certain elasticity and maintains contact with the center point of the reinforcing bar, if the reinforcing bar is stretched unevenly, the center point will shift, causing the elastic rope 10 to deform to a certain extent. This provides a more intuitive way for the operator to observe whether the reinforcing bar is subjected to uniform force, thereby improving the accuracy of the tensile test.
[0013] The equipment base 1 is provided with a plurality of connecting rods 11, and the elastic rope 10 passes around each connecting rod 11 in sequence.
[0014] Since the elastic rope 10 passes around each connecting rod 11 in sequence, it can be ensured that the elastic rope 10 is in a taut state, thereby further ensuring that when the center point of the steel bar shifts, the elastic rope 10 can deform precisely accordingly, thus ensuring the accuracy of the steel bar tensile test results.
[0015] Both the first positioning base 8 and the second positioning base 9 are provided with telescopic rods 12, and the two ends of the elastic rope 10 are respectively fixedly connected to the two telescopic rods 12.
[0016] Since both the first positioning base 8 and the second positioning base 9 are equipped with telescopic rods 12, the telescopic rods 12 can extend and retract to a certain extent, thereby improving the height of the elastic rope 10 so that it can match the position of the reinforcing bar to be tested. The elastic rope 10 can maintain contact with the reinforcing bar, and this device can adapt to the needs of reinforcing bars of different sizes.
[0017] The equipment base 1 is also equipped with a contact sensor 13 and an alarm 14. There are two contact sensors 13. When the elastic rope 10 is in its initial state, the two contact sensors 13 are symmetrically arranged about the elastic rope 10 as an axis of symmetry. The height of the two contact sensors 13 matches the height of the elastic rope 10, and the distance between the two contact sensors 13 is less than 1 cm. The controller 7 is electrically connected to both the contact sensors 13 and the alarm 14. Because the two contact sensors 13 are symmetrically arranged about the elastic rope 10 as an axis of symmetry when the elastic rope 10 is in its initial state, and the distance between the two contact sensors 13 is less than 1 cm, when the tension at both ends of the reinforcing bar is uneven, causing uneven deformation of the reinforcing bar, the elastic rope 10 will also deform. When the elastic rope 10 comes into contact with one of the contact sensors 13, the contact sensor 13 sends an electrical signal to the controller 7. The controller 7 then controls the alarm 14 to sound an alarm and controls the first lead screw motor 4 and the second lead screw motor 5 to stop working, so that staff can check for problems and avoid deviations in the reinforcing bar tensile test results.
Claims
1. A centering device for steel tensile testing, characterized in that: The device includes a base, a first clamp connected to the base, a second clamp slidably connected to the base, a first lead screw motor for driving the first clamp, a second lead screw motor for driving the second clamp, a positioning assembly connected to the base, and a controller. The positioning assembly includes a first positioning base connected to the base, a second positioning base connected to the base, and an elastic rope connecting the first and second positioning bases. When the first and second clamps are in their initial state, the central axes of the first and second positioning bases are in the same vertical plane as the axes of symmetry of the first and second clamps. When the two ends of the reinforcing bar to be tested are clamped in the first and second clamps respectively, the elastic rope remains in contact with the reinforcing bar to be tested. The controller is electrically connected to the first and second lead screw motors respectively.
2. A centering device for steel tension testing according to claim 1, characterized in that: The equipment base is provided with several connecting rods, and the elastic rope passes around each connecting rod in sequence.
3. A centering device for a steel bar tensile test according to claim 1, characterized in that: Both the first positioning base and the second positioning base are equipped with telescopic rods, and the two ends of the elastic rope are respectively fixedly connected to the two telescopic rods.
4. A centering device for steel tension testing as defined in claim 1, wherein: The device base is also equipped with a contact sensor and an alarm. There are two contact sensors. When the elastic rope is in the initial state, the two contact sensors are symmetrically arranged with the elastic rope as the axis of symmetry. The height of the two contact sensors is adapted to the height of the elastic rope. The distance between the two contact sensors is less than 1 cm. The controller is electrically connected to the contact sensors and the alarm respectively.