Electric fatigue testing machine for hot-rolled ribbed steel bars

Abstract

The utility model relates to the technical field of steel bar fatigue detection, in particular to an electric fatigue testing machine for a hot-rolled ribbed steel bar, which can be used for detecting the bending fatigue strength of the ribbed steel bar at high temperature, and is convenient to use and high in practicability. Comprising a bottom plate, a supporting frame, a box body and a sealing door, the box body is installed at the upper end of the bottom plate through the supporting frame, a cavity is formed in the box body, an opening communicated with the cavity is formed in the front end of the cavity of the box body, and the sealing door is installed at the opening in the front end of the cavity of the box body; the device further comprises a clamping mechanism, a heating mechanism, a pressing mechanism and a supporting mechanism, the clamping mechanism is installed on the box body, the clamping mechanism has a clamping and fixing function, the heating mechanism is installed on the box body, the heating mechanism has a heating function, the pressing mechanism and the supporting mechanism are both installed on the box body, the pressing mechanism has a pressing function, and the supporting mechanism has a pressing function. The supporting mechanism has a supporting function.

Description

Technical Field

[0001] This utility model relates to the technical field of steel bar fatigue testing, and in particular to an electric fatigue testing machine for hot-rolled ribbed steel bars. Background Technology

[0002] Hot-rolled ribbed steel bars, as one of the most important load-bearing materials in concrete structures, have a direct impact on structural safety due to their quality stability. Bending is one of the most common conditions that occur in concrete structures during normal operation. Testing the bending fatigue strength of steel bars can determine their seismic resistance. If the fatigue strength of the steel bars is insufficient, they will not be able to maintain their strength under continuous bending impact forces during an earthquake, leading to deformation and damage to the building itself, and potentially even causing a major safety accident. Therefore, conducting bending fatigue tests on steel bars is of great importance in ensuring structural safety. In the prior art, utility model patent application number 202221447883.7 discloses a multi-station rotary bending fatigue testing machine, which mainly consists of a hydraulic press, a push rod, and a rebar lap joint. In use, the rebar is placed on the rebar lap joint, and then the hydraulic press lowers the push rod, causing it to repeatedly press down on the rebar, thus performing a bending fatigue test. The inventor believes that this method has the following problems: it can only test the fatigue strength of rebar at room temperature. For rebar used in high-temperature environments, such as nuclear power plants, metallurgy, or furnaces, which are exposed to high temperatures for extended periods, the fatigue strength of the rebar is affected. The aforementioned prior art device cannot test the fatigue strength of rebar at high temperatures, making it inconvenient to use. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides an electric fatigue testing machine for hot-rolled ribbed steel bars that can detect the bending fatigue strength of ribbed steel bars at high temperatures, is easy to use, and has high practicality.

[0004] This utility model relates to an electric fatigue testing machine for hot-rolled ribbed steel bars, comprising a base plate, a support frame, a housing, and a sealing door. The housing is mounted on the upper end of the base plate via the support frame. The housing contains a chamber with an opening at the front end communicating with the chamber. The sealing door is installed at the opening at the front end of the chamber. The machine also includes a clamping mechanism, a heating mechanism, a pressing mechanism, and a supporting mechanism. The clamping mechanism is mounted on the housing and functions as a clamping and fixing mechanism. The heating mechanism is mounted on the housing and functions as a heating mechanism. Both the pressing mechanism and the supporting mechanism are mounted on the housing; the pressing mechanism functions as a pressing mechanism, and the supporting mechanism functions as a supporting mechanism. The machine is used for bending ribbed steel bars. During the bending fatigue test, the sealed door is first opened, and then the ribbed steel bar is placed into the chamber and clamped and fixed at one end by the clamping mechanism. Then, the ribbed steel bar is heated to the specified temperature by the heating mechanism. After that, the middle of the ribbed steel bar is supported by the support mechanism, and then the ribbed steel bar is repeatedly pressed down by the pressing mechanism with a certain pressure until a certain number of times. Afterwards, the staff observes whether the ribbed steel bar has cracks, breaks or irreversible deformation, which can infer whether the bending fatigue strength of the ribbed steel bar is qualified. It can test the bending fatigue strength of ribbed steel bars at high temperature, is convenient to use and highly practical.

[0005] Preferably, the heating mechanism includes a hydraulic cylinder A, a push rod, a moving rod, a fixed plate, and an infrared heating tube. The hydraulic cylinder A is fixedly installed at the rear end of the housing. The push rod and the moving rod are both slidably installed on the housing. The rear end of the push rod is connected to the output end of the hydraulic cylinder A. The fixed plate is fixedly installed at the front end of the push rod and the moving rod. The infrared heating tube is fixedly installed on the fixed plate. An infrared thermometer is installed on the fixed plate. The fixed plate and the infrared heating tube are both located inside the cavity of the housing. After the ribbed steel bar is clamped and fixed, the hydraulic cylinder A is opened. The hydraulic cylinder A, through the push rod, causes the fixed plate to move the infrared heating tube forward, thereby bringing the infrared heating tube closer to the ribbed steel bar. Then, the infrared heating tube is opened, allowing the infrared heating tube to heat the ribbed steel bar through infrared rays. At the same time, the temperature of the ribbed steel bar is detected by the infrared thermometer until the ribbed steel bar is heated to a suitable temperature. This facilitates the heating of the ribbed steel bar.

[0006] Preferably, the clamping mechanism includes a drive motor, a rotating shaft, and a three-jaw chuck. The drive motor is fixedly mounted on the upper end of the housing, the rotating shaft is rotatably mounted on the housing, the left end of the rotating shaft is connected to the output end of the drive motor, and the three-jaw chuck is fixedly mounted on the right end of the rotating shaft, located within the cavity of the housing. When clamping and fixing the ribbed steel bar, the left end of the ribbed steel bar is clamped and fixed by the three-jaw chuck. When heating the ribbed steel bar, the drive motor is turned on, and the drive motor causes the three-jaw chuck to rotate the ribbed steel bar through the rotating shaft. During the rotation, the ribbed steel bar is evenly heated by the infrared heating tube. After the ribbed steel bar is heated, the rotation of the ribbed steel bar is stopped, and then the middle part of the ribbed steel bar is supported by the support mechanism. After that, the ribbed steel bar can be bent by pressing down. This facilitates the clamping and fixing of the ribbed steel bar.

[0007] Preferably, the support mechanism includes a hydraulic cylinder B, a push rod, and a top plate. The hydraulic cylinder B is fixedly mounted on the base plate, the push rod is slidably mounted on the housing, and the top plate is fixedly mounted on the upper end of the push rod. The lower end of the push rod is connected to the output end of the hydraulic cylinder B. After the ribbed steel bar is heated, the hydraulic cylinder B is opened, and the hydraulic cylinder B raises the top plate through the push rod, so that the top plate contacts the middle of the ribbed steel bar, and the top plate supports the middle of the ribbed steel bar. Then, the ribbed steel bar is pressed down by the pressing mechanism.

[0008] Preferably, the pressing mechanism includes an electric cylinder, a sliding rod, a connecting block, and a pressure plate. The electric cylinder is fixedly installed at the upper end of the housing, the sliding rod is slidably installed on the housing, the upper end of the sliding rod is connected to the output end of the electric cylinder, the pressure plate is fixedly installed at the lower end of the connecting block, a pressure sensor is installed at the lower end of the sliding rod, and the connecting block is fixedly installed at the lower end of the pressure sensor. Both the connecting block and the pressure plate are located within the cavity of the housing. When performing a bending fatigue test on the ribbed steel bar, the electric cylinder is opened, and the electric cylinder, through the sliding rod, causes the pressure sensor to drive the connecting block and the pressure plate to descend, so that the pressure plate contacts the ribbed steel bar and applies a certain downward pressure to the ribbed steel bar. Then, the pressure plate is raised, and then lowered again to apply downward pressure to the ribbed steel bar until a certain number of downward pressures are applied to the ribbed steel bar. Then, the bending fatigue strength of the ribbed steel bar can be inferred by observing whether irreversible deformation occurs, which facilitates the detection of the ribbed steel bar.

[0009] Preferably, the surface of the pressure plate is provided with a high-temperature resistant coating; this feature improves the high-temperature resistance of the pressure plate and extends its service life.

[0010] Preferably, the surface of the box is provided with a heat insulation layer; through the above arrangement, the heat loss inside the box cavity is reduced, and the heating effect on the ribbed steel bars is improved.

[0011] Compared with the prior art, the advantages of this utility model are: it can detect the bending fatigue strength of ribbed steel bars at high temperature, it is convenient to use and has high practicality. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural schematic diagram of the present invention;

[0013] Figure 2 This is a structural diagram of hydraulic cylinder A, push rod, and fixed plate, etc.

[0014] Figure 3 This is a schematic diagram of the heating mechanism;

[0015] Figure 4 This is a schematic diagram of the first isometric structure of this utility model;

[0016] Figure 5 This is a schematic diagram of the second isometric structure of this utility model.

[0017] The following components are marked in the attached diagram: 1. Base plate; 2. Support frame; 3. Box body; 4. Sealing door; 5. Hydraulic cylinder A; 6. Push rod; 7. Moving rod; 8. Fixed plate; 9. Infrared heating tube; 10. Drive motor; 11. Rotating shaft; 12. Three-jaw chuck; 13. Hydraulic cylinder B; 14. Top rod; 15. Top plate; 16. Electric cylinder; 17. Sliding rod; 18. Connecting block; 19. Pressure plate; 20. Pressure sensor; 21. Ribbed steel bar. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0019] Example 1

[0020] like Figures 1 to 5The electric fatigue testing machine for hot-rolled ribbed steel bars of this utility model includes a base plate 1, a support frame 2, a housing 3, a sealing door 4, a clamping mechanism, a heating mechanism, a pressing mechanism, and a support mechanism. The housing 3 is mounted on the upper end of the base plate 1 via the support frame 2. A chamber is provided inside the housing 3, and an opening communicating with the chamber is provided at the front end of the chamber. The sealing door 4 is installed at the opening at the front end of the chamber. The clamping mechanism is mounted on the housing 3 and has a clamping and fixing function. The heating mechanism is mounted on the housing 3 and has a heating function. The pressing mechanism and the support mechanism are both mounted on the housing 3; the pressing mechanism has a pressing function, and the support mechanism has a supporting function. The machine is used for bending fatigue testing of ribbed steel bars 21. First, open the sealing door 4, then place the ribbed steel bar 21 into the chamber 3 and clamp and fix one end of the ribbed steel bar 21 using the clamping mechanism. Then, heat the ribbed steel bar 21 using the heating mechanism until it reaches the specified temperature. Next, support the middle of the ribbed steel bar 21 using the support mechanism, and then repeatedly press down on the ribbed steel bar 21 with a certain pressure until it has been pressed down a certain number of times. Afterward, the staff can observe whether the ribbed steel bar 21 shows cracks, breaks, or irreversible deformation to infer whether the bending fatigue strength of the ribbed steel bar 21 is qualified. It can test the bending fatigue strength of the ribbed steel bar 21 at high temperatures, is convenient to use, and has high practicality.

[0021] like Figure 3 The heating mechanism includes a hydraulic cylinder A5, a push rod 6, a moving rod 7, a fixed plate 8, and an infrared heating tube 9. The hydraulic cylinder A5 is fixedly installed at the rear end of the housing 3. The push rod 6 and the moving rod 7 are both slidably installed on the housing 3. The rear end of the push rod 6 is connected to the output end of the hydraulic cylinder A5. The fixed plate 8 is fixedly installed at the front end of the push rod 6 and the moving rod 7. The infrared heating tube 9 is fixedly installed on the fixed plate 8. An infrared thermometer is installed on the fixed plate 8. The fixed plate 8 and the infrared heating tube 9 are both located in the cavity of the housing 3. After the ribbed steel bar 21 is clamped and fixed, the hydraulic cylinder A5 is opened. The hydraulic cylinder A5, through the push rod 6, causes the fixed plate 8 to move the infrared heating tube 9 forward, thereby bringing the infrared heating tube 9 closer to the ribbed steel bar 21. Then, the infrared heating tube 9 is turned on, allowing the infrared heating tube 9 to heat the ribbed steel bar 21 through infrared rays. At the same time, the infrared thermometer detects the temperature of the ribbed steel bar 21 until the ribbed steel bar 21 is heated to a suitable temperature. This facilitates the heating of the ribbed steel bar 21.

[0022] like Figure 2The clamping mechanism includes a drive motor 10, a rotating shaft 11, and a three-jaw chuck 12. The drive motor 10 is fixedly mounted on the upper end of the housing 3, and the rotating shaft 11 is rotatably mounted on the housing 3. The left end of the rotating shaft 11 is connected to the output end of the drive motor 10, and the three-jaw chuck 12 is fixedly mounted on the right end of the rotating shaft 11. The three-jaw chuck 12 is located inside the cavity of the housing 3. When clamping and fixing the ribbed steel bar 21, the left end of the ribbed steel bar 21 is clamped and fixed by the three-jaw chuck 12. When heating the ribbed steel bar 21, the drive motor 10 is turned on, and the drive motor 10 drives the three-jaw chuck 12 to rotate the ribbed steel bar 21 through the rotating shaft 11. During the rotation, the ribbed steel bar 21 is evenly heated by the infrared heating tube 9. After the ribbed steel bar 21 is heated, the ribbed steel bar 21 is stopped rotating, and then the middle part of the ribbed steel bar 21 is supported by the support mechanism. Then, the ribbed steel bar 21 can be bent by pressing down. This facilitates the clamping and fixing of the ribbed steel bar 21.

[0023] like Figure 2 The pressing mechanism includes an electric cylinder 16, a sliding rod 17, a connecting block 18, and a pressure plate 19. The electric cylinder 16 is fixedly installed on the upper end of the housing 3. The sliding rod 17 is slidably installed on the housing 3, with its upper end connected to the output end of the electric cylinder 16. The pressure plate 19 is fixedly installed on the lower end of the connecting block 18. A pressure sensor 20 is installed on the lower end of the sliding rod 17, and the connecting block 18 is fixedly installed on the lower end of the pressure sensor 20. Both the connecting block 18 and the pressure plate 19 are located within the cavity of the housing 3. When performing a bending fatigue test on the ribbed steel bar 21, the opening... The electric cylinder 16, through the sliding rod 17, causes the pressure sensor 20 to drive the connecting block 18 and the pressure plate 19 to descend, so that the pressure plate 19 contacts the ribbed steel bar 21 and applies a certain downward pressure to the ribbed steel bar 21. Then the pressure plate 19 is raised, and then lowered again to apply downward pressure to the ribbed steel bar 21, until a certain number of downward pressures are applied to the ribbed steel bar 21. Then, the bending fatigue strength of the ribbed steel bar 21 can be inferred by observing whether irreversible deformation occurs, which facilitates the detection of the ribbed steel bar 21.

[0024] Continue to refer to Figure 2 The support mechanism includes a hydraulic cylinder B13, a push rod 14, and a top plate 15. The hydraulic cylinder B13 is fixedly installed on the base plate 1, the push rod 14 is slidably installed on the housing 3, and the top plate 15 is fixedly installed on the upper end of the push rod 14. The lower end of the push rod 14 is connected to the output end of the hydraulic cylinder B13. After the ribbed steel bar 21 is heated, the hydraulic cylinder B13 is opened. The hydraulic cylinder B13 raises the top plate 15 through the push rod 14, so that the top plate 15 contacts the middle of the ribbed steel bar 21, and the top plate 15 supports the middle of the ribbed steel bar 21. Then, the ribbed steel bar 21 is pressed down by the pressing mechanism.

[0025] The surface of the pressure plate 19 is provided with a high-temperature resistant coating; through the above-mentioned setting, the high-temperature resistance of the pressure plate 19 is improved, and the service life of the pressure plate 19 is increased.

[0026] Example 2

[0027] Based on Example 1, the surface of the box 3 is also provided with a heat insulation layer; through the above-mentioned arrangement, the heat loss inside the box 3 is reduced, and the heating effect on the ribbed steel bars 21 is improved.

[0028] The infrared heating tube 9, three-jaw chuck 12, electric cylinder 16 and pressure sensor 20 of the electric fatigue testing machine for hot-rolled ribbed steel bars of this utility model are all purchased from the market. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An electric fatigue testing machine for hot-rolled ribbed steel bars, comprising a base plate (1), a support frame (2), a housing (3), and a sealing door (4), wherein the housing (3) is mounted on the upper end of the base plate (1) via the support frame (2), a chamber is provided inside the housing (3), and an opening communicating with the chamber is provided at the front end of the chamber, and the sealing door (4) is installed at the opening at the front end of the chamber; characterized in that, It also includes a clamping mechanism, a heating mechanism, a pressing mechanism and a supporting mechanism. The clamping mechanism is installed on the housing (3) and has the function of clamping and fixing. The heating mechanism is installed on the housing (3) and has the function of heating. The pressing mechanism and the supporting mechanism are both installed on the housing (3). The pressing mechanism has the function of pressing down and the supporting mechanism has the function of supporting.

2. The electric fatigue testing machine for hot-rolled ribbed steel bars as described in claim 1, characterized in that, The heating mechanism includes a hydraulic cylinder A (5), a push rod (6), a moving rod (7), a fixed plate (8), and an infrared heating tube (9). The hydraulic cylinder A (5) is fixedly installed at the rear end of the housing (3). The push rod (6) and the moving rod (7) are both slidably installed on the housing (3). The rear end of the push rod (6) is connected to the output end of the hydraulic cylinder A (5). The fixed plate (8) is fixedly installed at the front end of the push rod (6) and the moving rod (7). The infrared heating tube (9) is fixedly installed on the fixed plate (8). An infrared thermometer is installed on the fixed plate (8). The fixed plate (8) and the infrared heating tube (9) are both located in the cavity of the housing (3).

3. The electric fatigue testing machine for hot-rolled ribbed steel bars as described in claim 1, characterized in that, The clamping mechanism includes a drive motor (10), a rotating shaft (11), and a three-jaw chuck (12). The drive motor (10) is fixedly installed on the upper end of the housing (3). The rotating shaft (11) is rotatably installed on the housing (3). The left end of the rotating shaft (11) is connected to the output end of the drive motor (10). The three-jaw chuck (12) is fixedly installed on the right end of the rotating shaft (11). The three-jaw chuck (12) is located in the cavity of the housing (3).

4. The electric fatigue testing machine for hot-rolled ribbed steel bars as described in claim 1, characterized in that, The support mechanism includes a hydraulic cylinder B (13), a push rod (14), and a top plate (15). The hydraulic cylinder B (13) is fixedly installed on the base plate (1), the push rod (14) is slidably installed on the housing (3), the top plate (15) is fixedly installed on the upper end of the push rod (14), and the lower end of the push rod (14) is connected to the output end of the hydraulic cylinder B (13).

5. The electric fatigue testing machine for hot-rolled ribbed steel bars as described in claim 1, characterized in that, The pressing mechanism includes an electric cylinder (16), a sliding rod (17), a connecting block (18), and a pressure plate (19). The electric cylinder (16) is fixedly installed on the upper end of the housing (3). The sliding rod (17) is slidably installed on the housing (3). The upper end of the sliding rod (17) is connected to the output end of the electric cylinder (16). The pressure plate (19) is fixedly installed on the lower end of the connecting block (18). A pressure sensor (20) is provided on the lower end of the sliding rod (17). The connecting block (18) is fixedly installed on the lower end of the pressure sensor (20). Both the connecting block (18) and the pressure plate (19) are located in the cavity of the housing (3).

6. The electric fatigue testing machine for hot-rolled ribbed steel bars as described in claim 5, characterized in that, The surface of the pressure plate (19) is provided with a high-temperature resistant coating.

7. The electric fatigue testing machine for hot-rolled ribbed steel bars as described in claim 1, characterized in that, The surface of the box (3) is provided with a heat insulation layer.

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