Vertical steel bar bending tester
Through the cooperation of the support mechanism and the stamping mechanism, the position and spacing of the support rod of the steel bending test machine are adjusted by using pressure detection and laser distance measurement, which solves the problems of uneven force and insufficient angle in the cold bending test of steel bars, and achieves high-precision steel bending test.
Patent Information
- Application Number
- CN202510690498.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-27
- Publication Date
- 2025-07-22
AI Technical Summary
When the existing vertical steel bar bending test machine conducts cold bending tests on steel bars, the stress at both ends of the steel bars is uneven and the bending angle is insufficient, resulting in low test accuracy.
The support mechanism and stamping mechanism are adopted, and the pressure detector and driving components are used to adjust the position of the support rod, so that the center of gravity of the steel bar coincides with the center of the two support rods, ensuring uniform stress, and precise adjustment of the support rod spacing and stamping head specifications through the laser rangefinder and distance detector to achieve uniform stress and precise bending of the steel bar.
The accuracy and quality of the steel bar bending test are improved, ensuring the accurate bending angle of the steel bar, and solving the problems of uneven stress and insufficient angle.
Smart Images
Figure CN120352265A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of steel bar bending tests, and particularly relates to a vertical steel bar bending testing machine. Background Art
[0002] Steel bars are widely used in concrete building structures and play a crucial role in the strength and stability of concrete building structures. Therefore, it is necessary to test the mechanical properties of the produced steel bars when they bear bending loads, and reference can be made to GB / T 232-2010 "Test Methods for Bending of Metallic Materials".
[0003] Common steel bar bending testing machines include vertical steel bar bending testing machines and horizontal steel bar bending testing machines. The vertical steel bar bending testing machine includes two support rods and a pressing head that can move up and down. During use, the two ends of the steel bar are placed on the two support rods, and the angle by which the steel bar needs to be bent is input. Then the pressing head moves downward to bend the steel bar.
[0004] When the vertical steel bar bending testing machine conducts a 180° cold bending test, the test steel bar needs to be in the middle of the pressing head, that is, the two ends of the steel bar need to be symmetrically placed on the two support rods with the pressing head as the central axis, so as to ensure the stability during the bending test of the steel bar. Moreover, during the cold bending test, when the steel bar needs to be bent into 180°, the steel bar needs to be in contact with the support rod under the gradually applied pressure of the pressing head. In order to enable the steel bar to be smoothly bent into 180°, the distances between the two support rods and the pressing head are slightly larger than the diameter of the steel bar, so as to ensure that the steel bar can be smoothly bent when in contact with the pressing head. However, this results in a situation where during the cold bending test, due to the gap between the pressing head and the side wall of the support rod, the steel bar cannot be truly bent into 180°, thus affecting the test results. In addition, when the steel bar is placed on the support rod during the cold bending test, it is placed manually, which will cause a positional deviation between the center of the steel bar and the center of the pressing head, resulting in uneven stress at the two bending ends of the steel bar, and thus the bending accuracy of the testing machine is not high. Summary of the Invention
[0005] In order to solve the above problems existing in the prior art, the invention provides a vertical steel bar bending testing machine, which solves the problems that the existing vertical steel bar bending testing machine is prone to uneven stress at both ends of the steel bar and insufficient bending angle during the cold bending test of the steel bar, resulting in low test accuracy.
[0006] The object of the present invention can be achieved by the following technical solutions: A vertical steel bar bending testing machine, comprising a machine table, a support mechanism and a stamping mechanism. The stamping mechanism is installed on the top surface of the machine table. The support mechanism is installed on the top surface of the machine table and is arranged corresponding to the stamping area of the stamping mechanism. A slide rail is provided on the top surface of the machine table. Two sliders are slidably provided at both ends of the top of the slide rail. The support mechanism includes two support rods, two support seats, a pressure detector and a driving component. The two support rods are respectively rotatably connected to the tops of the two support seats. The driving component is connected to any one of the support rods and drives it to rotate. The two support seats are respectively installed on the top surfaces of the two sliders. A pressure detector is provided on the bottom surface of the support seat. The pressure detector is used to detect the pressure of the support seat on the slider. The steel bar to be tested is placed on the top surfaces of the two support rods. The driving component drives the support rod to rotate according to the detection values of the two pressure detectors to adjust the position of the steel bar on the two support rods.
[0007] As a preferred technical solution of the present invention, the support mechanism further includes a bidirectional screw and a driving member. The bidirectional screw is rotatably connected to the top of the slide rail. The two sliders are respectively helically connected to both ends of the bidirectional screw. The driving member drives the bidirectional screw to rotate.
[0008] As a preferred technical solution of the present invention, a V-shaped groove is provided on the outer surface of the support rod. The V-shaped groove is located at the center of the support rod.
[0009] As a preferred technical solution of the present invention, the V-shaped groove is a right-angle groove. A laser rangefinder is provided on the inner bottom surface of the V-shaped groove. The laser rangefinder is used to detect the distance from the steel bar to the inner bottom surface of the V-shaped groove.
[0010] As a preferred technical solution of the present invention, the support mechanism further includes a distance detector. The distance detector is installed on the side wall of a slider and is used to detect the distance between the two sliders. The two sliders adjust the distance between the two sliders according to the detection value of the laser rangefinder and are calibrated by the distance detector.
[0011] As a preferred technical solution of the present invention, the stamping mechanism includes a stamping cylinder, a bracket, a connecting block and a stamping head. The bracket is installed on the top surface of the machine table. The stamping cylinder is installed on the top of the bracket and the stamping area covers the support mechanism. The connecting block is installed at the stamping end of the stamping cylinder. The stamping head is installed on the bottom surface of the connecting block.
[0012] As a preferred technical solution of the present invention, an inverted trapezoidal boss is provided on the top surface of the stamping head. A clamping groove is provided on the bottom surface of the connecting block. The clamping groove is matched with the inverted trapezoidal boss. The stamping head is clamped in the clamping groove through the inverted trapezoidal boss.
[0013] As a preferred technical solution of the present invention, an avoidance groove is formed on the top surface of the machine table, and the avoidance groove is correspondingly arranged with the stamping area of the stamping mechanism.
[0014] As a preferred technical solution of the present invention, the driving component is a stepping driving motor.
[0015] The beneficial effects of the present invention are as follows: The pressure applied to the two support seats is detected by the pressure detector. When the detected value is higher than the value detected by the pressure detector on the other side, therefore, at this time, the driving component will be activated to drive the support rod to rotate in the direction with a lower detected value, so that the steel bar changes the position of the center of gravity through the rotating support rod, making the center of gravity coincide with the center between the two support rods, and making the detected values of the two pressure detectors equal, so that when the steel bar is subjected to a bending test, the stress at both ends of the steel bar can be made uniform, thus ensuring the bending accuracy during the test process, improving the test quality, and solving the problems that the existing vertical steel bar bending testing machine is prone to uneven stress at both ends of the steel bar and insufficient bending angle during the cold bending test of the steel bar, resulting in low test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.
[0017] Figure 1 is a structural schematic diagram of the present invention;
[0018] Figure 2 is a structural schematic diagram of the support mechanism of the present invention;
[0019] Figure 3 is a structural sketch of a steel bar placed on the V-shaped groove of the present invention;
[0020] MAIN ELEMENT SYMBOL DESCRIPTION
[0021] In the figure: 1, machine table; 11, avoidance groove; 2, support mechanism; 21, support rod; 211, V-shaped groove; 22, support seat; 23, driving component; 24, bidirectional screw; 25, driving member; 26, distance detector; 3, stamping mechanism; 31, stamping cylinder; 32, bracket; 33, connecting block; 34, stamping head; 341, inverted trapezoidal boss; 4, slide rail; 5, slider. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, with reference to the accompanying drawings and preferred embodiments, describe in detail the specific embodiments, structures, features, and effects according to the present invention.
[0023] Please refer to Figures 1 - 3, this embodiment provides a vertical steel bar bending testing machine, which includes a machine table 1, a support mechanism 2 and a stamping mechanism 3. The stamping mechanism 3 and the support mechanism 2 are both installed on the top surface of the machine table 1, and the support mechanism 2 is correspondingly arranged with the stamping area of the stamping mechanism 3. A slide rail 4 is provided on the top surface of the machine table 1, and two sliders 5 are slidably arranged on the slide rail 4. Among them, the support mechanism 2 includes two support rods 21, two support seats 22, a pressure detector and a driving component 23. The two support rods 21 are respectively rotatably connected to the tops of the two support seats 22. The driving component 23 is installed on any one of the support seats 22 and drives the support rod 21 on this support seat 22 to rotate. The two support seats 22 are respectively installed on the top surfaces of the two sliders 5. At the same time, a pressure detector is installed on the bottom surface of the support seat 22, and the pressure detector is used to detect the pressure exerted by the support seat 22 on the slider 5.
[0024] When performing a bending test on a steel bar, when the steel bar is placed on the top surfaces of the two support rods 21, if the center of gravity of the steel bar is located at the center of the two support rods 21 at this time, the moments supported by the two support rods 21 are the same. Then the gravity received by the two support seats 22 is also the same. Therefore, the detection values of the pressure detectors on the bottom surfaces of the two support seats 22 are also the same. If the center of gravity of the steel bar shifts to one side, the moment of the support rod 21 closer to the center of gravity will be shorter than the support moment of the other support rod 21. Then the support rod 21 closer to the center of gravity is equivalent to a laborious lever, and the weight it needs to bear will be greater than that of the other side's labor-saving lever. Therefore, at this time, the support seat 22 under the support rod 21 closer to the center of gravity will bear more weight of the steel bar. At this time, the value detected by the pressure detector on the bottom surface will be higher than the value detected by the pressure detector on the other side. Therefore, at this time, the driving component 23 will start to drive the support rod 21 to rotate in the direction with a lower detection value, so that the steel bar can change the position of the center of gravity through the rotating support rod 21, make the center of gravity coincide with the center between the two support rods 21, and make the detection values of the two detection pressure detectors equal. Thus, when the steel bar is subjected to a bending test, the force on both ends of the bending of the steel bar can be made uniform, thereby ensuring the bending accuracy during the test process and improving the test quality.
[0025] Since the driving component 23 is only installed on one support seat 22, in order to avoid errors in the detection data, therefore, only the incremental data needs to be calculated when detecting the steel bar.
[0026] When testing steel bars, when conducting cold bending tests on steel bars of different diameters, the distance between the two support rods 21 needs to be adjusted according to the different diameters of the steel bars. The distance between the two support rods 21 should be slightly greater than the diameter of the punching head 34 plus twice the diameter of the steel bar, so that when the punch performs a 180° cold bend, the steel bar can bend with a gap. Moreover, the two support rods 21 need to be symmetrically arranged with the punching area as the center. Therefore, it is necessary to move the two support rods 21 relatively or towards each other to ensure symmetry. In this embodiment, the support mechanism 2 further includes a bidirectional screw 24 and a driving member 25. The bidirectional screw 24 is rotatably connected to the top of the slide rail 4, and the two sliders 5 are respectively helically connected to both ends of the bidirectional screw 24. The driving member 25 drives the bidirectional screw 24 to rotate. Therefore, when conducting bending tests on steel bars of different diameters, the driving member 25 drives the bidirectional screw 24 to rotate to make the two sliders 5 approach or move away from each other to adjust the distance between the two support rods 21, so as to better conduct bending tests on steel bars.
[0027] In order to ensure the stability of the steel bar during the bending process, in one embodiment, a V-shaped groove 211 is provided on the outer surface of the support rod 21. The V-shaped groove 211 is located at the center of the support rod 21. By providing the V-shaped groove 211 on the support rod 21, when conducting a bending test on the steel bar, the position of the steel bar can be restricted by the side walls of the V-shaped groove 211, so that the steel bar will not deviate in position due to shaking or when adjusting the position of the support rod 21 during bending, thereby affecting the accuracy of the bending test.
[0028] Since different-sized punching heads 34 need to be replaced for steel bars of different diameters to complete the bending test, therefore, in order to more quickly and accurately determine what specification of punching head 34 the steel bar to be tested needs to match, in one embodiment, the V-shaped groove 211 is a right-angled groove, and a laser rangefinder is provided on the inner bottom surface of the V-shaped groove 211. The laser rangefinder is used to detect the distance from the steel bar to the inner bottom surface of the V-shaped groove 211. Since the V-shaped groove 211 is a right-angled groove, therefore, referring to Figure 3 , when steel bars of any diameter are placed in the V-shaped groove 211, the outer side wall surface of the steel bar will be tangent to the two side walls of the V-shaped groove 211, and the distance from the tangent point to the center of the circle is the same as the distance from the tangent point to the bottom of the V-shaped groove 211. And the distance from the bottom of the groove to the center of the circle is r + a. Therefore, by using the laser rangefinder to detect the distance a from the bottom of the groove to the outer surface of the steel bar, the radius of the steel bar can be calculated, and then different specifications of punching heads 34 can be replaced accordingly according to the detection results of the laser rangefinder.
[0029] Steel bars of different diameters require adjustment of the distance between the two support rods 21. Therefore, in order to adjust the distance between the two support rods 21 more precisely and ensure the smooth progress of the bending test of the steel bars, in one embodiment, the support mechanism 2 further includes a distance detector 26. The distance detector 26 is installed on the side wall of a slider 5 and is used to detect the distance between the two sliders 5. The two sliders 5 adjust the distance between them according to the detection value of the laser rangefinder and are calibrated by the distance detector 26. When the diameter of the steel bar is detected by the laser rangefinder, the distance between the two support rods 21 needs to be adjusted. When the driving member 25 adjusts the distance between the two support rods 21 by driving the bidirectional screw 24, the distance detector 26 is used to control the adjusted distance to ensure that the support rod 21 can move accurately in place, thereby ensuring the accuracy of the bending test.
[0030] Moreover, when the steel bar is being stamped and bent, a certain gap needs to be reserved to ensure the smooth bending of the steel bar when it is bent under the restriction of the support rod 21 and the stamping head 34. This results in the fact that the steel bar cannot be truly bent to 180° after being bent in place. Therefore, in order to ensure the accurate completion of the steel bar bending test, after the stamping head 34 stamps in place, the stamping head 34 moves upward, and then the driving member 25 rotates the bidirectional screw 24 to make the two support rods 21 move closer to each other, eliminating the previously reserved gap, so that the steel bar can be bent to 180°, thus ensuring the accuracy of the bending test and avoiding the occurrence of deviations in the inspection results of the steel bar due to the incomplete bending of the steel bar in the bending test.
[0031] In order to better stamp the steel bar to complete the bending test, in one embodiment, the stamping mechanism 3 includes a stamping cylinder 31, a bracket 32, a connecting block 33 and a stamping head 34. The bracket 32 is installed on the top surface of the machine table 1. The stamping cylinder 31 is installed on the top of the bracket 32 and the stamping area covers the support mechanism 2. The connecting block 33 is installed on the stamping end of the stamping cylinder 31, and the stamping head 34 is installed on the bottom surface of the connecting block 33. When the steel bar is placed on the two support rods 21 and the adjustment is completed, the stamping cylinder 31 is started to drive the stamping head 34 to press down, thereby completing the stamping of the steel bar and enabling the steel bar to complete the bending test.
[0032] Since steel bars of different diameters need to be matched with punching heads 34 of different specifications, in order to quickly replace the punching head 34, in one embodiment, a trapezoidal boss 341 is provided on the top surface of the punching head 34, and a clamping groove is provided on the bottom surface of the connecting block 33. The clamping groove is matched with the trapezoidal boss 341. The punching head 34 is clamped in the clamping groove through the trapezoidal boss 341. When replacing the punching head 34, only need to align the trapezoidal boss 341 of the punching head 34 with the clamping groove on the connecting block 33, and then gently push it in. Due to the shape matching, the boss will naturally snap into the clamping groove. Moreover, since the punching head 34 only moves up and down during the punching process, the position of the punching head 34 will not be affected by shaking and cause an impact on the punching result. Therefore, through a simple clamping mechanism, the operator can complete the replacement of the punching head 34 within a few seconds, thereby improving the efficiency of the bending test.
[0033] When performing a bending test on a steel bar, a certain height needs to be reserved to allow the steel bar to be bent. Therefore, the distance between the top surface of the support rod 21 and the top surface of the machine table 1 needs to be greater than twice the length of the test steel bar. And the larger the diameter of the steel bar, the longer the test length. Therefore, in order to ensure the height of the bending test while reducing production costs, in one embodiment, a relief groove 11 is provided on the top surface of the machine table 1. The relief groove 11 is correspondingly arranged with the punching area of the punching mechanism 3. By providing the relief groove 11 on the top surface of the machine table 1, it is possible to avoid raising the height of the support seat 22 to ensure the test bending height. And the provided relief groove 11 allows larger-sized steel bars to smoothly complete the bending test, while reducing the cost of manufacturing the support seat 22.
[0034] In order to more accurately control the position of the steel bar between the two support rods 21, in one embodiment, the driving component 23 is a stepping drive motor. When the driving component 23 drives the support rod 21 to rotate to adjust the position of the steel bar, the stepping motor has good position control accuracy and repeatability. It can accurately control the rotation angle of the support rod 21 with a set step angle, realizing fine adjustment of the position of the steel bar. The high-precision characteristic of the stepping motor enables it to remain consistent during multiple adjustments, ensuring that the same standard can be achieved for each test or processing.
[0035] The above are only preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A vertical steel bar bending testing machine, characterized in that: It includes a machine platform, a support mechanism and a stamping mechanism. The stamping mechanism is installed on the top surface of the machine platform. The support mechanism is installed on the top surface of the machine platform and is correspondingly arranged with the stamping area of the stamping mechanism. A slide rail is provided on the top surface of the machine platform. Two sliders are slidably provided at both ends of the top of the slide rail. The support mechanism includes two support rods, two support seats, a pressure detector and a driving component. The two support rods are respectively rotatably connected to the tops of the two support seats. The driving component is connected to any one of the support rods and drives it to rotate. The two support seats are respectively installed on the top surfaces of the two sliders. A pressure detector is provided on the bottom surface of the support seat. The pressure detector is used to detect the pressure of the support seat on the slider. The steel bar for the test is placed on the top surfaces of the two support rods. The driving component drives the support rod to rotate according to the detection values of the two pressure detectors to adjust the position of the steel bar on the two support rods.
2. The vertical steel bar bending testing machine according to claim 1, characterized in that: The support mechanism further includes a bidirectional screw rod and a driving member. The bidirectional screw rod is rotatably connected to the top of the slide rail. The two sliders are respectively helically connected to both ends of the bidirectional screw rod. The driving member drives the bidirectional screw rod to rotate.
3. The vertical steel bar bending testing machine according to claim 1, wherein: A V-shaped groove is formed on the outer surface of the support rod. The V-shaped groove is located at the center of the support rod.
4. The vertical steel bar bending testing machine according to claim 3, characterized in that: The V-shaped groove is a right-angle groove. A laser rangefinder is provided on the inner bottom surface of the V-shaped groove. The laser rangefinder is used to detect the distance between the steel bar and the inner bottom surface of the V-shaped groove.
5. The vertical steel bar bending testing machine according to claim 4, characterized in that: The support mechanism further includes a distance detector. The distance detector is installed on the side wall of one slider and is used to detect the distance between the two sliders. The two sliders adjust the distance between the two sliders according to the detection value of the laser rangefinder and are calibrated by the distance detector.
6. The vertical steel bar bending testing machine according to claim 1, characterized in that: The stamping mechanism includes a stamping cylinder, a bracket, a connecting block and a stamping head. The bracket is installed on the top surface of the machine platform. The stamping cylinder is installed on the top of the bracket and the stamping area covers the support mechanism. The connecting block is installed at the stamping end of the stamping cylinder. The stamping head is installed on the bottom surface of the connecting block.
7. The vertical steel bar bending testing machine according to claim 6, wherein: An inverted trapezoidal boss is provided on the top surface of the stamping head. A clamping groove is provided on the bottom surface of the connecting block. The clamping groove is matched with the inverted trapezoidal boss. The stamping head is clamped in the clamping groove through the inverted trapezoidal boss.
8. The vertical steel bar bending testing machine according to claim 1, characterized in that: An avoidance groove is formed on the top surface of the machine platform. The avoidance groove is correspondingly arranged with the stamping area of the stamping mechanism.
9. The vertical steel bar bending testing machine according to claim 1, characterized in that: The driving component is a stepping drive motor.
Citation Information
Cited By
Device and method for detecting bending resistance of steel reinforced concrete structure
CN121656021A