Prestressed tendon reverse bending fatigue testing device
By designing a prestressed tendon reverse bending fatigue testing device with a limiting seat and buffer structure, the problem of reinforcing bars popping out and rotating in the bending test machine was solved, achieving higher safety and testing accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO JIAOTONG TESTING CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-05-12
AI Technical Summary
In existing reverse bending testing machines, the reinforcing bars are prone to popping out and rotating during testing, which affects safety and testing accuracy.
A prestressed tendon reverse bending fatigue testing device was designed. Through structures such as limit seats, guide frames and buffer springs, it is ensured that the reinforcing bars are not easy to pop out and rotate during the bending process. A cylinder-driven pressure block is used for limiting and buffering.
This improves the safety and accuracy of the test, ensures the stability of the reinforcing bars during bending, prevents the reinforcing bars from popping out and rotating, and enhances the stability and accuracy of the test.
Smart Images
Figure CN224231519U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel bar testing technology, specifically a device for testing the reverse bending fatigue of prestressed tendons. Background Technology
[0002] The steel bar reverse bending test machine is a process equipment for conducting cold bending tests and plane reverse bending tests on steel bars. The test machine consists of a frame, workbench, working disc, reducer, clamping device, electrical control box, etc. It features compact structure, simple operation, large load-bearing capacity, stable operation, low noise, intuitive display of bending angle, safety and reliability, and convenient maintenance.
[0003] However, in the current process of using the reverse bending test machine for steel bars, the steel bars are usually placed on the top side of the workbench and then tested by pressing with pressure blocks. During the test, when the steel bars bend, they usually slide inside the groove on the top side of the workbench, which can easily cause the steel bars to pop out, resulting in poor safety. In addition, when the middle part of the steel bar is bent and subjected to force, the steel bar is prone to rotation, affecting the test accuracy and stability. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] To address the shortcomings of existing technologies, this utility model provides a prestressed tendon reverse bending fatigue testing device, which has the advantages of reinforcing bar limiting effect, preventing popping out and improving safety in use. At the same time, the structure is stable, and the reinforcing bar is not prone to rotation during the test, thus improving the test accuracy and solving the above-mentioned technical problems.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, this utility model provides the following technical solution: a prestressed tendon reverse bending fatigue testing device, comprising a base, a movable frame movably mounted on the top side of the base, a connecting rod provided on the right side of the movable frame, a placement platform fixedly mounted on the top side of the movable frame, a limiting seat movably mounted on the top side of the placement platform, a guide frame movably mounted on the top side of the base, a stop fixedly mounted on the top side of the guide frame, a support frame fixedly mounted on the top side of the base, a cylinder provided on the top side of the support frame, a pressure block fixedly mounted on the driving end of the cylinder, and a rubber clamp provided on the bottom side of the pressure block.
[0008] Preferably, a slide rail is fixedly installed on the top side of the base, and two sets of slide rails are provided in pairs. Side plates are fixedly installed on the left and right ends of the top side of the base, and a positioning hole is provided on the right side of the side plate.
[0009] The above technical solution improves the stability and smoothness of the movable frame movement by means of the slide rail, and facilitates the return spring to generate a reaction force by means of the side plate, thus making it easier for the movable frame to be reset after the test is completed.
[0010] Preferably, two sliding blocks are fixedly installed at both ends of the bottom side of the movable frame, the sliding blocks are movably installed on the outside of the slide rail, and a second positioning hole is opened on the left side of the movable frame. A nut is threadedly connected to the end of the connecting rod near the stop, and a return spring is sleeved on the outer side of the end of the connecting rod away from the stop.
[0011] The above technical solution facilitates quick and easy positioning and installation of the connecting rod through the No. 2 and No. 1 positioning holes. At the same time, the removal of the nut facilitates quick disassembly and improves ease of use.
[0012] Preferably, a first placement groove is provided on the top side of the placement platform, and a sliding groove and a baffle are respectively provided at both ends of the top side of the placement platform. The sliding groove and the baffle are a set, and a total of four sets are provided.
[0013] The above technical solution facilitates the placement of test steel bars under the action of the No. 1 placement groove, and the corresponding two sets of sliding grooves help improve the stability of the limit seat when it moves. At the same time, the baffle further enhances the stability of the limit seat.
[0014] Preferably, a movable rod is fixedly installed on the side of the limiting seat near the baffle, a fastening spring is provided between the movable rod and the baffle, and an inclined groove is provided on the bottom side of the limiting seat.
[0015] With the above technical solution, during the bending fatigue test, the two ends of the steel bar will bend up to a certain extent. At this time, the two ends of the steel bar will engage with the inclined groove on the bottom side of the limiting seat, thereby limiting the movement. Then, as the two ends of the steel bar continue to bend up during the test, they push the limiting seat to move. During this process, the fastening spring generates a reaction force to limit the steel bar and prevent it from popping out.
[0016] Preferably, guide rods are fixedly installed at the four corners of the bottom side of the guide frame, and buffer springs are provided between the lower end of the guide rods and the base. A second placement groove is provided on the top side of the stop, and the size and shape of the second placement groove match the first placement groove.
[0017] With the above technical solution, during the test, the cylinder is activated to push the pressure block downwards, and it engages with the No. 2 placement groove through the rubber clamp, which helps to limit the middle position of the steel bar. Then, it continues to move to carry out the bending fatigue test. During the pressing process, the stop and guide frame continue to move downwards, which helps to buffer and reset under the action of the buffer spring. Furthermore, under the limiting action of the stop, it helps to improve the stability of the bending of the middle of the steel bar and avoid rotation that would affect the test accuracy.
[0018] Compared with the prior art, this utility model provides a prestressed tendon reverse bending fatigue testing device, which has the following beneficial effects:
[0019] 1. The starting cylinder of this utility model pushes the pressure block to move downward and engages with the No. 2 placement groove through the rubber clamp, which helps to limit the middle position of the steel bar. Then it continues to move to carry out bending fatigue test. During the pressing process, the stop and guide frame continue to move downward. Under the action of the buffer spring, it helps to buffer and reset. Furthermore, under the limiting action of the stop, it helps to improve the stability of the bending of the middle of the steel bar and avoid rotation that would affect the test accuracy.
[0020] 2. During the bending fatigue test, the two ends of the reinforcing bar will bend up to a certain extent. At this time, the two ends of the reinforcing bar will engage with the inclined groove on the bottom side of the limiting seat, thereby limiting the position. As the two ends of the reinforcing bar continue to bend up during the test, they will push the limiting seat to move. During this process, the fastening spring will generate a reaction force to limit the reinforcing bar and pull the movable frame of the placement platform to move, thereby improving the stability of the test and preventing the reinforcing bar from popping out, thus improving the safety of the test. Attached Figure Description
[0021] Figure 1 This is a three-dimensional structural diagram of the entire utility model;
[0022] Figure 2 This is a schematic diagram of the rear view structure of this utility model;
[0023] Figure 3 This is a frontal cross-sectional view of the present invention.
[0024] Figure 4 This is a three-dimensional structural diagram of the base of this utility model;
[0025] Figure 5 This is an exploded three-dimensional structural diagram of the movable frame and limiting seat of this utility model.
[0026] The components include: 1. Base; 2. Movable frame; 3. Connecting rod; 4. Placement platform; 5. Limiting seat; 6. Guide frame; 7. Stop seat; 8. Support frame; 9. Cylinder; 10. Pressure block; 11. Rubber clamp seat; 101. Slide rail; 102. Side plate; 103. Positioning hole No. 1; 201. Slide seat; 202. Positioning hole No. 2; 301. Nut; 302. Return spring; 401. Placement slot No. 1; 402. Slide groove; 403. Baffle; 501. Inclined groove; 502. Movable rod; 5021. Fastening spring; 601. Guide rod; 602. Buffer spring; 701. Placement slot No. 2. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] Example 1:
[0029] like Figure 1-5 As shown, the present invention provides a prestressed tendon reverse bending fatigue testing device, including a base 1, a movable frame 2 movably mounted on the top side of the base 1, a connecting rod 3 provided on the right side of the movable frame 2, a placement platform 4 fixedly mounted on the top side of the movable frame 2, a limiting seat 5 movably mounted on the top side of the placement platform 4, a guide frame 6 movably mounted on the top side of the base 1, a stop 7 fixedly mounted on the top side of the guide frame 6, a support frame 8 fixedly mounted on the top side of the base 1, a cylinder 9 provided on the top side of the support frame 8, a pressure block 10 fixedly mounted on the driving end of the cylinder 9, and a rubber clamp 11 provided on the bottom side of the pressure block 10.
[0030] Specifically, a slide rail 101 is fixedly installed on the top side of the base 1. Two slide rails 101 are arranged in pairs, for a total of two sets. Side plates 102 are fixedly installed on the left and right ends of the top side of the base 1, respectively. A positioning hole 103 is provided on the right side of the side plate 102. The advantage is that the four sets of slide rails 101 improve the stability and smoothness of the movable frame 2 during movement. Furthermore, the side plates 102 facilitate the return spring 302 to generate a reaction force, thus facilitating the reset of the movable frame 2 after testing.
[0031] Specifically, slide blocks 201 are fixedly installed at both ends of the bottom side of the movable frame 2. The slide blocks 201 are movably installed on the outside of the slide rail 101. A second positioning hole 202 is provided on the left side of the movable frame 2. A nut 301 is threadedly connected to the end of the connecting rod 3 near the stop 7. A return spring 302 is sleeved on the outer side of the end of the connecting rod 3 away from the stop 7. The advantage is that the second positioning hole 202 and the first positioning hole 103 facilitate quick and easy positioning and installation of the connecting rod 3. At the same time, by removing the nut 301, it is easy to quickly disassemble and improve the convenience of use.
[0032] Specifically, a first placement slot 401 is provided on the top side of the placement platform 4. Slides 402 and baffles 403 are respectively provided at both ends of the top side of the placement platform 4. Slides 402 and baffles 403 form a set, and a total of four sets are provided. The advantages are that the first placement slot 401 facilitates the placement of test steel bars, and the corresponding two sets of slides 402 help improve the stability of the limiting seat 5 during movement. Simultaneously, the baffles 403 further enhance the stability of the limiting seat 5.
[0033] Example 2:
[0034] like Figure 1-5 As shown, this is an improvement on the previous embodiment. Specifically, a movable rod 502 is fixedly installed on the side of the limiting seat 5 near the baffle 403. A fastening spring 5021 is provided between the movable rod 502 and the baffle 403, and a groove 501 is provided on the bottom side of the limiting seat 5. The advantage is that the two ends of the reinforcing bar are engaged with the groove 501 on the bottom side of the limiting seat 5, thereby limiting the movement. Then, when the two ends of the reinforcing bar continuously tilt upwards during the test, it pushes the limiting seat 5 to move. During this process, the fastening spring 5021 generates a reaction force to limit the reinforcing bar and prevent it from popping out.
[0035] Specifically, guide rods 601 are fixedly installed at the four corners of the bottom side of the guide frame 6. A buffer spring 602 is installed between the lower end of the guide rod 601 and the base 1. A second placement groove 701 is provided on the top side of the stop 7, and the size and shape of the second placement groove 701 match the first placement groove 401. The advantage is that by starting the cylinder 9 to push the pressure block 10 downwards, and engaging it with the second placement groove 701 via the rubber clamp 11, the middle position of the reinforcing bar is effectively limited. Then, as the bending fatigue test continues, the stop 7 and guide frame 6 continuously move downwards during the pressing process. The buffer spring 602 facilitates buffering and resetting. Furthermore, the limiting effect of the stop 7 improves the stability of the bending of the middle part of the reinforcing bar and prevents rotation from affecting the test accuracy.
[0036] During use, the reinforcing bar is inserted into the inner side of the first placement slot 401 and the second placement slot 701 from the left or right side of the device. Then, the cylinder 9 is activated to push the pressure block 10 downward, and it engages with the second placement slot 701 through the rubber clamp 11, which helps to limit the middle position of the reinforcing bar. Then, the device continues to move to perform a bending fatigue test. During the pressing process, the stop 7 and the guide frame 6 continue to move downward. Under the action of the buffer spring 602, it helps to buffer and reset. Furthermore, under the limiting action of the stop 7, it helps to improve the stability of the bending of the middle of the reinforcing bar and avoid rotation that would affect the test accuracy. During the bending fatigue test, the two ends of the reinforcing bar will bend up to a certain extent. At this time, the two ends of the reinforcing bar engage with the inclined groove 501 on the bottom side of the limiting seat 5, thereby limiting it. As the two ends of the reinforcing bar continue to bend up during the test, they push the limiting seat 5 to move. During this process, the fastening spring 5021 generates a reaction force to limit the reinforcing bar and pulls the movable frame 2 of the placement platform 4 to move, improving the test stability and preventing the reinforcing bar from popping out, thereby improving the test safety.
[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A prestressed tendon reverse bending fatigue testing device, comprising a base (1), characterized in that: A movable frame (2) is movably installed on the top side of the base (1). A connecting rod (3) is provided on the right side of the movable frame (2). A placement platform (4) is fixedly installed on the top side of the movable frame (2). A limit seat (5) is movably installed on the top side of the placement platform (4). A guide frame (6) is movably installed on the top side of the base (1). A stop seat (7) is fixedly installed on the top side of the guide frame (6). A support frame (8) is fixedly installed on the top side of the base (1). A cylinder (9) is provided on the top side of the support frame (8). A pressure block (10) is fixedly installed on the driving end of the cylinder (9). A rubber card seat (11) is provided on the bottom side of the pressure block (10).
2. The prestressed tendon reverse bending fatigue testing device according to claim 1, characterized in that: The top side of the base (1) is fixedly installed with a slide rail (101). The slide rail (101) is arranged in pairs, and there are two sets in total. The left and right ends of the top side of the base (1) are fixedly installed with side plates (102). A positioning hole (103) is opened on the right side of the side plate (102).
3. The prestressed tendon reverse bending fatigue testing device according to claim 2, characterized in that: The movable frame (2) has two fixed sliding blocks (201) installed at both ends of its bottom side. The sliding blocks (201) are movably installed on the outside of the slide rail (101). The movable frame (2) has a second positioning hole (202) on its left side. The end of the connecting rod (3) near the stop (7) is connected to a nut (301) by a thread. The outer side of the end of the connecting rod (3) away from the stop (7) is fitted with a return spring (302).
4. The prestressed tendon reverse bending fatigue testing device according to claim 1, characterized in that: The top side of the placement platform (4) has a first placement groove (401). The two ends of the top side of the placement platform (4) are respectively provided with a sliding groove (402) and a baffle (403). The sliding groove (402) and the baffle (403) are a set, and a total of four sets are provided.
5. The prestressed tendon reverse bending fatigue testing device according to claim 4, characterized in that: A movable rod (502) is fixedly installed on the side of the limiting seat (5) near the baffle (403). A fastening spring (5021) is provided between the movable rod (502) and the baffle (403), and a slanted groove (501) is provided on the bottom side of the limiting seat (5).
6. The prestressed tendon reverse bending fatigue testing device according to claim 5, characterized in that: Guide rods (601) are fixedly installed at the four corners of the bottom side of the guide frame (6). A buffer spring (602) is provided between the lower end of the guide rod (601) and the base (1). A second placement groove (701) is provided on the top side of the stop (7). The size and shape of the second placement groove (701) match the first placement groove (401).