Reinforcing steel bar residual stress deformation detection device

Abstract

The utility model discloses a steel bar residual stress deformation detection device which comprises a detection box, temperature adjusting mechanisms used for adjusting the internal temperature of the detection box are arranged on the two corresponding inner walls of the detection box, a box door is arranged on the surface of the detection box, and a first fixing mechanism is arranged at the bottom of the inner wall of the detection box. A hydraulic cylinder is fixedly installed at the top of the detection box, the end of a piston rod of the hydraulic cylinder extends into the detection box to be connected with a second fixing mechanism, a to-be-detected steel bar is arranged between the first fixing mechanism and the second fixing mechanism, and an extensometer used for detecting residual stress deformation is arranged on the outer side of the to-be-detected steel bar. Mounting boxes are symmetrically fixed to the bottom of the inner wall of the detection box, the temperature in the detection box can be adjusted through combination of the semiconductor chilling plate and the two-way fan, temperature adjustment can be achieved by controlling the fan at the refrigerating end or the heating end, the detection process can be conducted in different temperature environments, and the detection efficiency is improved. The stress deformation performance in the actual working condition is simulated.

Description

Technical Field

[0001] This utility model relates to the field of steel bar stress detection technology, specifically a steel bar residual stress deformation detection device. Background Technology

[0002] Stress testing includes surface stress detection on workpieces, depth stress detection, and qualitative and quantitative analysis of stress. It is frequently used for quality inspection during product manufacturing and for process improvement based on stress distribution. The stresses involved include machining stress, casting stress, welding stress, 3D printing stress, and cold working stress. Stress is categorized into tensile stress, compressive stress, torsional stress, shear stress, and other types. Residual stresses are often generated during machining, welding, and casting processes.

[0003] According to the steel bar residual stress deformation detection device disclosed in patent number CN 221055930 U, the detection process of steel bar residual stress is carried out at room temperature, which makes it difficult to determine the influence of different temperature environments on the detection of steel bar residual stress, resulting in low detection accuracy. Moreover, the existing steel bar residual stress deformation detection device is operated manually, and the operation process is cumbersome, which brings great trouble to the detection. Therefore, we propose a steel bar residual stress deformation detection device. Utility Model Content

[0004] The purpose of this invention is to provide a device for detecting residual stress deformation in reinforcing bars, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for detecting residual stress deformation of reinforcing bars, comprising a detection box, wherein temperature regulating mechanisms for adjusting the internal temperature of the detection box are provided on both inner walls of the detection box, a box door is provided on the surface of the detection box, a first fixing mechanism is provided at the bottom of the inner wall of the detection box, a hydraulic cylinder is fixedly installed on the top of the detection box, and the piston rod end of the hydraulic cylinder extends into the detection box and is connected to a second fixing mechanism, a reinforcing bar to be tested is provided between the first fixing mechanism and the second fixing mechanism, and an extensometer for detecting residual stress deformation is provided on the outer side of the reinforcing bar to be tested.

[0006] Preferably, the first fixing mechanism includes a mounting box and a clamping seat. The mounting boxes are symmetrically fixed to the bottom of the inner wall of the detection box. A lifting cylinder is fixedly installed between the two mounting boxes at the bottom of the inner wall of the detection box, and a clamping seat is fixed to the piston rod end of the lifting cylinder. The mounting box is provided with an inclined surface on one side of the clamping seat. The two ends of the clamping seat are respectively slidably connected to the mounting box. The bottom end of the steel bar to be tested is connected to the clamping seat.

[0007] Preferably, the second fixing mechanism includes a fixing box, a telescopic cylinder, and a positioning block. The piston rod end of the hydraulic cylinder extends into the detection box and is fixedly connected to the fixing box. Telescopic cylinders are fixedly installed on the corresponding two side walls of the fixing box, and the piston rod end of the telescopic cylinder extends into the fixing box and is fixed to the positioning block. The top end of the steel bar to be tested is connected between the two positioning blocks.

[0008] Preferably, the temperature regulating mechanism includes bidirectional fans, and bidirectional fans are symmetrically installed at both ends of the top of the detection box. The detection box has mounting cavities at both ends, and a semiconductor cooling chip is installed in the mounting cavity. A partition plate is provided in the middle of the mounting cavity, and the mounting cavity forms two partition grooves through the partition plate. The cooling end and heating end of the semiconductor cooling chip are located in the two partition grooves respectively, and the ventilation ends of the four bidirectional fans are respectively connected to the interior of the four partition grooves.

[0009] Preferably, the two corresponding inner walls of the testing box are symmetrically and equidistantly provided with ventilation holes, and the four sets of ventilation holes are respectively connected to the interior of the four partition grooves. The two corresponding inner walls of the testing box are slidably provided with sealing plates, and the sealing plates are in contact with the ventilation holes. The bottom of the inner wall of the testing box is provided with a slide rail, and the bottom end of the sealing plate is slidably connected to the surface of the slide rail. An electric telescopic rod is fixedly installed at the bottom of the inner wall of the testing box, and the piston rod end of the electric telescopic rod is fixed to the bottom end of the sealing plate.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. This utility model uses a combination of a semiconductor cooling chip and a bidirectional fan to adjust the internal temperature of the testing chamber. The temperature can be adjusted by controlling the fan at the cooling or heating end, so that the testing process can be carried out in different temperature environments to simulate the stress deformation performance in actual working conditions. For example, the physical properties of steel bars will be different at different temperatures. This device can effectively test the residual stress deformation at different temperatures.

[0012] 2. The present invention combines a hydraulic cylinder and a lifting cylinder to achieve precise stretching and positioning of the steel bar to be tested, ensuring the repeatability and accuracy of each test. The cooperation between the telescopic cylinder and the positioning block can quickly and accurately adjust the position of the steel bar, reduce the error of manual operation, and improve the testing efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is an enlarged structural schematic diagram of point A of this utility model;

[0015] Figure 3This is a schematic diagram of the internal structure of the mounting cavity of this utility model;

[0016] Figure 4 This is a schematic diagram of the connection structure between the extensometer and the steel bar to be measured according to this utility model.

[0017] Figure 5 This is a schematic diagram of the second fixing mechanism of this utility model.

[0018] In the diagram: 1. Testing box; 2. Temperature regulation mechanism; 3. Box door; 4. First fixing mechanism; 5. Second fixing mechanism; 6. Hydraulic cylinder; 7. Extensometer; 8. Fixing box; 9. Telescopic cylinder; 10. Positioning block; 11. Rebar to be tested; 12. Two-way fan; 13. Mounting cavity; 14. Semiconductor cooling chip; 15. Electric telescopic rod; 16. Sealing plate; 17. Slide rail; 18. Vent hole; 19. Mounting box; 20. Clamping seat; 21. Lifting cylinder. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1 This utility model provides a technical solution: a device for detecting residual stress deformation of reinforcing bars, including a detection box 1, and temperature regulating mechanisms 2 for adjusting the internal temperature of the detection box 1 are provided on both inner walls of the detection box 1. A box door 3 is provided on the surface of the detection box 1. A first fixing mechanism 4 is provided at the bottom of the inner wall of the detection box 1. A hydraulic cylinder 6 is fixedly installed on the top of the detection box 1, and the piston rod end of the hydraulic cylinder 6 extends into the detection box 1 and is connected to a second fixing mechanism 5. A reinforcing bar 11 to be tested is provided between the first fixing mechanism 4 and the second fixing mechanism 5. An extensometer 7 for detecting residual stress deformation is provided on the outside of the reinforcing bar 11 to be tested.

[0021] It should be noted that the extensometer 7 is a resistance strain gauge, which is made of a very thin metal resistance wire (such as copper, nickel-chromium alloy, etc.) and the resistance wire is precisely fixed on a flexible substrate. The substrate has a certain adhesive layer, which can be pasted on the surface of the steel bar 11 to be measured. When the object deforms, the resistance wire pasted on the extensometer 7 will also change its length and shape with the deformation. Since the resistance is related to the length, cross-sectional area and resistivity of the material, when the resistance wire deforms, its resistance will change. By measuring the change in resistance, the deformation of the steel bar 11 to be measured can be calculated.

[0022] Please see Figure 1 and Figure 2 The first fixing mechanism 4 includes a mounting box 19 and a clamping seat 20. The mounting boxes 19 are symmetrically fixed at the bottom of the inner wall of the detection box 1. A lifting cylinder 21 is fixedly installed at the bottom of the inner wall of the detection box 1 between the two mounting boxes 19. The piston rod end of the lifting cylinder 21 is fixed with a clamping seat 20. The mounting box 19 is provided with an inclined surface on one side of the clamping seat 20. The two ends of the clamping seat 20 are respectively slidably connected in the mounting box 19. The bottom end of the steel bar 11 to be tested is connected in the clamping seat 20.

[0023] It should be noted that the bottom end of the steel bar 11 to be tested is clamped in the clamping seat 20, and then the lifting cylinder 21 controls the clamping seat 20 to slide down, so that the two ends of the clamping seat 20 clamp and fix the bottom end of the steel bar 11 to be tested, thereby clamping and fixing the bottom end of the steel bar 11 to be tested.

[0024] Please see Figure 5 The second fixing mechanism 5 includes a fixing box 8, a telescopic cylinder 9, and a positioning block 10. The piston rod end of the hydraulic cylinder 6 extends into the detection box 1 and is fixedly connected to the fixing box 8. Telescopic cylinders 9 are fixedly installed on the corresponding two side walls of the fixing box 8, and the piston rod end of the telescopic cylinder 9 extends into the fixing box 8 and is fixed to the positioning block 10. The top end of the steel bar 11 to be tested is connected between the two positioning blocks 10.

[0025] It should be noted that the top of the steel bar 11 to be tested is placed between the two positioning blocks 10 inside the fixing box 8, and the telescopic cylinder 9 is controlled to work. The two positioning blocks 10 clamp and fix the top of the steel bar 11 to be tested, thereby fixing the top of the steel bar 11 to be tested.

[0026] Please see Figure 1 , Figure 2 and Figure 3 The temperature regulation mechanism 2 includes a bidirectional fan 12. The bidirectional fan 12 is symmetrically installed at both ends of the top of the detection box 1. The detection box 1 has a mounting cavity 13 at both ends, and a semiconductor cooling chip 14 is installed in the mounting cavity 13. A partition plate is provided in the middle of the mounting cavity 13, and the mounting cavity 13 forms two partition grooves through the partition plate. The cooling end and heating end of the semiconductor cooling chip 14 are located in the two partition grooves respectively. The ventilation ends of the four bidirectional fans 12 are respectively connected to the interior of the four partition grooves.

[0027] It should be noted that when the internal environment of the testing chamber 1 needs to be cooled, the two electric telescopic rods 15 are operated. The piston rods of the electric telescopic rods 15 extend, causing the sealing plate 16 to block the two sets of symmetrical vent holes 18. The bidirectional fan 12 above the cooling end of the semiconductor cooling chip 14 operates, blowing air inward, while the other two bidirectional fans 12 expel the hot air from the heating end of the semiconductor cooling chip 14, allowing the internal cold air to enter the testing chamber 1 through the vent holes 18, thus cooling the internal environment of the testing chamber 1. The steel bar 11 to be tested is then measured under this environment. Similarly, during high-temperature testing, the bidirectional fan 12 expels the cold air inside the testing chamber 1, and then the sealing plate 16 blocks the other two sets of symmetrical vent holes 18, causing the bidirectional fan 12 above the heating end of the semiconductor cooling chip 14 to work and blow air inward, so that the internal hot air is blown into the testing chamber 1 through the vent holes 18. The other two bidirectional fans 12 expel the cold air from the cooling end of the semiconductor cooling chip 14, thereby enabling the detection of the residual stress deformation of the steel bar 11 under high-temperature conditions.

[0028] Please see Figure 1 The two inner walls of the test box 1 are symmetrically and equidistantly provided with ventilation holes 18, and the four sets of ventilation holes 18 are respectively connected to the interior of the four partition grooves. The two inner walls of the test box 1 are slidably provided with sealing plates 16, and the sealing plates 16 are in contact with the ventilation holes 18. The bottom of the inner wall of the test box 1 is provided with a slide rail 17, and the bottom end of the sealing plate 16 is slidably connected to the surface of the slide rail 17. An electric telescopic rod 15 is fixedly installed at the bottom of the inner wall of the test box 1, and the piston rod end of the electric telescopic rod 15 is fixed to the bottom end of the sealing plate 16.

[0029] It should be noted that, when using this utility model, the extensometer 7 is installed on the outside of the reinforcing bar 11 to be tested, and the bottom end of the reinforcing bar 11 is clamped in the clamping seat 20. Then, the lifting cylinder 21 controls the clamping seat 20 to slide down, so that the two ends of the clamping seat 20 clamp and fix the bottom end of the reinforcing bar 11. Then, the top end of the reinforcing bar 11 is placed between the two positioning blocks 10 in the fixing box 8, and the telescopic cylinder 9 is controlled to work. The two positioning blocks 10 clamp and fix the top end of the reinforcing bar 11. When the piston rod of the hydraulic cylinder 6 retracts, the reinforcing bar 11 is stretched. The residual stress deformation is detected by the extensometer 7. The semiconductor cooling chip 14 is controlled to work by the control system set in the device. When it is necessary to cool the internal environment of the detection box 1, the two electric telescopic rods 15 are controlled to work. The piston rods of the electric telescopic rods 15 extend, so that the sealing plate 16 seals the two sets of symmetrical vent holes 18. The bidirectional fan 12 above the cooling end of the thermoelectric cooler 14 operates, blowing air inwards, while the other two bidirectional fans 12 expel the hot air from the heating end of the thermoelectric cooler 14, allowing the internal cold air to enter the test chamber 1 through the vent 18, thus cooling the internal environment of the test chamber 1. The residual stress deformation of the steel bar 11 under test is measured under this environment. Similarly, during the small-scale test in a high-temperature environment, the bidirectional fan 12 expels the cold air from the inside of the test chamber 1, and then the sealing plate 16 controls the sealing of the other two sets of symmetrical vents 18, causing the bidirectional fan 12 above the heating end of the thermoelectric cooler 14 to operate, blowing air inwards, allowing the internal hot air to be blown into the test chamber 1 through the vent 18, while the other two bidirectional fans 12 expel the cold air from the cooling end of the thermoelectric cooler 14, thereby detecting the residual stress deformation of the steel bar 11 under test in a high-temperature environment.

[0030] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] 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 device for detecting residual stress deformation in reinforcing bars, characterized in that, The test box (1) is provided with a temperature regulating mechanism (2) for adjusting the internal temperature of the test box (1) on both inner walls. The test box (1) is provided with a door (3) on its surface. A first fixing mechanism (4) is provided at the bottom of the inner wall of the test box (1). A hydraulic cylinder (6) is fixedly installed on the top of the test box (1). The piston rod end of the hydraulic cylinder (6) extends into the test box (1) and is connected to a second fixing mechanism (5). A steel bar (11) to be tested is provided between the first fixing mechanism (4) and the second fixing mechanism (5). An extensometer (7) for detecting residual stress deformation is provided on the outside of the steel bar (11).

2. The device for detecting residual stress deformation in reinforcing bars according to claim 1, characterized in that: The first fixing mechanism (4) includes a mounting box (19) and a clamping seat (20). The mounting boxes (19) are symmetrically fixed at the bottom of the inner wall of the detection box (1). A lifting cylinder (21) is fixedly installed between the two mounting boxes (19) at the bottom of the inner wall of the detection box (1). The piston rod end of the lifting cylinder (21) is fixed with a clamping seat (20). The mounting box (19) is provided with an inclined surface on one side of the clamping seat (20). The two ends of the clamping seat (20) are respectively slidably connected in the mounting box (19). The bottom end of the steel bar (11) to be tested is connected in the clamping seat (20).

3. The device for detecting residual stress deformation in reinforcing bars according to claim 1, characterized in that: The second fixing mechanism (5) includes a fixing box (8), a telescopic cylinder (9) and a positioning block (10). The piston rod end of the hydraulic cylinder (6) extends into the detection box (1) and is fixedly connected to the fixing box (8). Telescopic cylinders (9) are fixedly installed on the corresponding two side walls of the fixing box (8), and the piston rod end of the telescopic cylinder (9) extends into the fixing box (8) and is fixed to the positioning block (10). The top end of the steel bar (11) to be tested is connected between the two positioning blocks (10).

4. The device for detecting residual stress deformation in reinforcing bars according to claim 1, characterized in that: The temperature regulation mechanism (2) includes a bidirectional fan (12). The bidirectional fan (12) is symmetrically installed at both ends of the top of the detection box (1). The detection box (1) has an installation cavity (13) at both ends. A semiconductor cooling chip (14) is installed in the installation cavity (13). A partition plate is provided in the middle of the installation cavity (13). The installation cavity (13) forms two partition grooves through the partition plate. The cooling end and heating end of the semiconductor cooling chip (14) are located in the two partition grooves respectively. The ventilation ends of the four bidirectional fans (12) are respectively connected to the interior of the four partition grooves.

5. The device for detecting residual stress deformation of reinforcing bars according to claim 4, characterized in that: The two inner walls of the test box (1) are symmetrically and equidistantly provided with ventilation holes (18), and the four sets of ventilation holes (18) are respectively connected to the interior of the four partition grooves. The two inner walls of the test box (1) are slidably provided with sealing plates (16), and the sealing plates (16) are in contact with the ventilation holes (18). The bottom of the inner wall of the test box (1) is provided with a slide rail (17), and the bottom end of the sealing plate (16) is slidably connected to the surface of the slide rail (17). The bottom of the inner wall of the test box (1) is fixedly installed with an electric telescopic rod (15), and the piston rod end of the electric telescopic rod (15) is fixed to the bottom end of the sealing plate (16).

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