A hot-rolled h-shaped steel fatigue detection device

Abstract

This utility model discloses a fatigue testing device for hot-rolled H-beams, including a base, a fixed platform, and a fixed seat. The fixed platform is located at one end of the base and is equipped with a clamping assembly for clamping one end of the H-beam. The fixed seat is fixedly located at the other end of the base. A movable seat is slidably mounted on the fixed seat, and a lower hydraulic cylinder is fixedly mounted on the movable seat. A fixed frame is fixedly mounted on the movable seat, and an upper hydraulic cylinder is mounted on the fixed frame. The upper hydraulic cylinder is located above the lower hydraulic cylinder, and a clamping assembly is located between the upper and lower hydraulic cylinders. In this utility model, both ends of the H-beam are fixedly clamped onto the two clamping assemblies. The clamping assembly on the fixed platform is fixedly mounted, and the clamping assembly at the other end swings and vibrates under the drive of the upper and lower hydraulic cylinders, causing the H-beam to shake. This allows for fatigue testing of the entire H-beam, making the test results more accurate.

Description

Technical Field

[0001] This utility model relates to the field of fatigue detection technology, and in particular to a fatigue detection device for hot-rolled H-beams. Background Technology

[0002] H-beams are an economical and efficient structural steel profile with an optimized cross-sectional area distribution and a more reasonable strength-to-weight ratio. They are named for their cross-section resembling the letter "H". With the rapid construction of infrastructure, H-beams are widely used due to their advantages such as high load-bearing capacity and short construction cycles. H-beams are generally manufactured using a hot-rolling process. When used as supports, H-beams are susceptible to slight swaying in windy and rainy weather due to the complex and variable outdoor environment. In extreme weather, the swaying amplitude increases, and after prolonged swaying, cracks or fractures may develop. Furthermore, changes in ambient temperature also affect H-beams. Therefore, fatigue testing is required before H-beams leave the factory to meet design requirements. However, H-beams are often quite long after production; for example, 12-meter standard lengths are commonly used for supports. Conventional fatigue testing methods involve cutting a portion of the H-beam for testing, which cannot be used for testing the entire H-beam. Therefore, the test results may be inaccurate, reducing the precision of the results. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the existing technology by providing a fatigue testing device for hot-rolled H-beams.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0005] A fatigue testing device for hot-rolled H-beams, comprising a base;

[0006] A fixing platform is provided at one end of the base, and a clamping assembly is provided on the fixing platform for clamping one end of the H-beam;

[0007] The mounting base is fixedly installed at the other end of the base;

[0008] A movable seat is slidably mounted on the fixed seat, and a lower hydraulic cylinder is provided on the movable seat;

[0009] A fixed frame is fixedly mounted on the movable seat. An upper hydraulic cylinder is mounted on the fixed frame, and a clamping assembly is provided between the upper hydraulic cylinder and the lower hydraulic cylinder.

[0010] Preferably, the clamping assembly includes a fixing block, the fixing block has an installation groove, and a clamping hydraulic cylinder is fixedly installed in the installation groove. There are multiple clamping hydraulic cylinders, which are evenly arranged along the circumferential direction for clamping and fixing the H-beam.

[0011] Preferably, a reinforcing ring is fixedly provided on the outer wall of the fixing block to enhance the strength of the fixing block.

[0012] Preferably, a translation hydraulic cylinder is fixedly installed on the base. There are two translation hydraulic cylinders, which are symmetrically arranged on both sides of the movable seat. The piston rod of the translation hydraulic cylinder is fixedly connected to the movable seat.

[0013] Preferably, a support assembly is slidably disposed on the base, the support assembly is located between the fixed platform and the fixed seat, the support assembly includes a support platform, a connecting groove is provided on the support platform, a lower support roller is rotatably disposed at the bottom of the connecting groove, an upper support roller is rotatably disposed at the top of the connecting groove, and the H-beam is located between the lower support roller and the upper support roller.

[0014] Preferably, a side roller is rotatably disposed in the connecting groove, and two side rollers are provided, with the two side rollers located on both sides of the H-beam.

[0015] Preferably, the base is provided with a sliding groove, which is located between the fixed platform and the fixed seat, and the support platform is slidably disposed in the sliding groove.

[0016] Preferably, a temperature regulating component is also provided, the temperature regulating component includes an upper insulation cover and a lower insulation cover, the upper insulation cover and the lower insulation cover are fixedly connected by a buckle, the upper insulation cover and the lower insulation cover are closed to wrap the H-shaped steel, and air inlet pipes are connected to both the upper insulation cover and the lower insulation cover.

[0017] Preferably, both the upper and lower insulation covers are made of flexible materials, and both the upper and lower insulation covers are provided with multiple semi-circular steel ring frames.

[0018] The beneficial effects of adopting the above technical solution are as follows:

[0019] 1. In this utility model, fatigue testing can be performed on the entire H-beam. The two ends of the H-beam are fixed to the clamping assembly of the fixed platform and the clamping assembly of the fixed frame, respectively. The upper hydraulic cylinder, lower hydraulic cylinder and translation hydraulic cylinder on the fixed frame are extended and retracted to drive the clamping assembly to shake, thereby causing the H-beam to swing, thus enabling fatigue testing of the H-beam and obtaining more accurate data.

[0020] 2. In this utility model, the support component can slide on the base, and at the same time, the support component can support the H-beam. When the H-beam is shaken, fatigue detection can be performed on different positions of the H-beam by moving the support component.

[0021] 3. In this utility model, the upper and lower insulation covers can wrap the H-beam after being closed. After wrapping, cold or hot air is blown into the interior through the air inlet pipe to regulate the internal temperature, thereby enabling the detection of the fatigue life of the H-beam under different temperature conditions and making the test results more accurate. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the support component structure of this utility model;

[0024] Figure 3 yes Figure 2 Enlarged view of part A;

[0025] Figure 4 This is a schematic diagram of the clamping assembly structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the clamping assembly structure according to another embodiment of the present invention;

[0027] Figure 6 This is a three-dimensional schematic diagram of the temperature regulation component of this utility model.

[0028] In the diagram: 1 is the base, 2 is the fixed platform, 3 is the fixed seat, 4 is the movable seat, 5 is the lower hydraulic cylinder, 6 is the upper hydraulic cylinder, 7 is the fixed block, 8 is the mounting groove, 9 is the clamping hydraulic cylinder, 10 is the reinforcing ring, 11 is the translational hydraulic cylinder, 12 is the support platform, 13 is the connecting groove, 14 is the lower support roller, 15 is the upper support roller, 16 is the side roller, 17 is the sliding groove, 18 is the upper insulation cover, 19 is the lower insulation cover, 20 is the air inlet pipe, 21 is the fixed frame, 22 is the web plate hydraulic cylinder, 23 is the first wing plate hydraulic cylinder, 24 is the second wing plate hydraulic cylinder, 25 is the connecting rod, 26 is the adjusting hydraulic cylinder, 27 is the connecting block, 28 is the baffle, and 29 is the vent. Detailed Implementation

[0029] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] like Figure 1 As shown, a fatigue testing device for hot-rolled H-beams includes a base 1, a fixed platform 2, and a fixed seat 3. The base 1 is fixedly mounted on the ground. The fixed platform 2 is fixedly mounted at one end of the base 1, and a clamping assembly is provided on the fixed platform 2 to clamp and fix one end of the H-beam. The fixed seat 3 is fixedly mounted at the other end of the base 1. A movable seat 4 is horizontally slidably mounted on the fixed seat 3. The sliding direction of the movable seat 4 is perpendicular to the length direction of the H-beam. A fixed frame 21 is fixedly mounted on the movable seat 4, and the fixed frame 21 is shaped like a "7". The H-beam has a U-shaped structure, including a vertical rod and a horizontal rod. The vertical rod of the fixed frame 21 is vertically fixed to the upper end face of the movable seat 4, and the horizontal rod is horizontally fixed to the upper end of the vertical rod. An upper hydraulic cylinder 6 is fixedly mounted on the horizontal rod of the fixed frame 21, and a lower hydraulic cylinder 5 is fixedly mounted on the upper end face of the movable seat 4. A clamping assembly is provided between the upper hydraulic cylinder 6 and the lower hydraulic cylinder 5. The clamping assembly is connected to the piston rods of the upper hydraulic cylinder 6 and the lower hydraulic cylinder 5. The two clamping assemblies have the same structure and are used to clamp and fix the two ends of the H-beam in the axial direction.

[0033] In this invention, one end of the H-beam is fixedly mounted on the clamping assembly of the fixed platform 2, and the other end is fixedly mounted on the clamping assembly between the upper hydraulic cylinder 6 and the lower hydraulic cylinder 5. After clamping and fixing, the piston rods of the upper hydraulic cylinder 6 and the lower hydraulic cylinder 5 continuously extend and retract, causing the clamping assembly to continuously swing up and down, thus allowing one end of the H-beam to swing up and down, thereby enabling fatigue testing of the H-beam. Meanwhile, the moving seat 4 continuously slides horizontally back and forth on the fixed seat 3, which also allows the H-beam to continuously swing in the horizontal direction, enabling fatigue testing of the H-beam in the left and right directions.

[0034] Furthermore, the cylinder of the upper hydraulic cylinder 6 is hinged to the crossbar of the fixed frame 21, and the piston rod of the upper hydraulic cylinder 6 is hinged to the clamping assembly. The cylinder of the lower hydraulic cylinder 5 is hinged to the upper end face of the movable seat 4, and the piston rod of the lower hydraulic cylinder 5 is hinged to the clamping assembly. The extension and retraction of the piston rods of the upper hydraulic cylinder 6 and the lower hydraulic cylinder 5 can drive the clamping assembly to swing up and down, while the clamping assembly set on the fixed platform 2 remains fixed. Therefore, one end of the H-beam can be fixed, while the other end swings up and down, thereby performing fatigue testing on the H-beam in the vertical direction until cracks or fractures appear. Similarly, after the piston rods of the upper hydraulic cylinder 6 and the lower hydraulic cylinder 5 are fixed, the H-beam can be made to swing left and right by the movable seat 4 on the fixed seat 3, thereby performing fatigue testing on the H-beam in the horizontal direction.

[0035] Furthermore, such as Figure 4 As shown, the clamping assembly includes a fixing block 7, on which an installation groove 8 is provided. A clamping hydraulic cylinder 9 is fixedly installed in the installation groove 8. There are multiple clamping hydraulic cylinders 9, which are evenly arranged along the circumference and used to clamp and fix the H-beam. In this embodiment, there are four clamping hydraulic cylinders 9, which are used to clamp and fix the H-beam around its four sides, thus clamping the H-beam.

[0036] It should be noted that the fixing block 7 located on the fixing platform 2 is fixedly connected to the fixing platform 2, so that the H-beam is fixed at one end of the fixing platform 2, while the fixing block 7 located between the upper hydraulic cylinder 6 and the lower hydraulic cylinder 5 is hinged to the piston rods of the upper hydraulic cylinder 6 and the lower hydraulic cylinder 5 respectively, so that the other end of the H-beam can swing.

[0037] Furthermore, a reinforcing ring 10 is fixedly provided on the outer wall of the fixing block 7 to enhance the strength of the fixing block 7.

[0038] In another embodiment, such as Figure 5As shown, the clamping assembly includes a fixing block 7 with an installation groove 8. An H-beam passes through the installation groove 8, with its web horizontally positioned and the flanges at both ends vertically arranged. Two web hydraulic cylinders 22 are installed in the installation groove 8, located above and below the web of the H-beam, respectively. The piston rods of the web hydraulic cylinders 22 abut against and clamp the web of the H-beam. A first flange hydraulic cylinder 23 is fixedly mounted on the piston rod of the web hydraulic cylinder 22. The cylinders of 23 can be fixedly connected by welding. Each web plate hydraulic cylinder 22 has two first wing plate hydraulic cylinders 23 on its piston rod. The piston rods of the two first wing plate hydraulic cylinders 23 abut against one wing plate respectively. At the same time, four second wing plate hydraulic cylinders 24 are also provided in the mounting groove 8. The four second wing plate hydraulic cylinders 24 are evenly distributed on both sides of the H-beam. The piston rods of the second wing plate hydraulic cylinders 24 abut against the wing plates of the H-beam. The second wing plate hydraulic cylinders 24 and the first wing plate hydraulic cylinders 23 work together to clamp and fix the wing plates of the H-beam.

[0039] Furthermore, a translation hydraulic cylinder 11 is fixedly installed on the base 1. There are two translation hydraulic cylinders 11, which are symmetrically arranged on both sides of the movable seat 4. The piston rod of the translation hydraulic cylinder 11 is fixedly connected to the movable seat 4, and the cylinder barrel of the translation hydraulic cylinder 11 is fixedly connected to the base 1. By extending and retracting the piston rod of the translation hydraulic cylinder 11, the movable seat 4 can be driven to swing left and right on the fixed seat 3.

[0040] It should be noted that a T-shaped groove is provided on the upper surface of the fixed seat 3, and the lower part of the movable seat 4 is locked in the T-shaped groove. During the sliding process, the movable seat 4 can slide in the T-shaped groove of the fixed seat 3, making the sliding of the movable seat 4 more stable and avoiding interference from vibration.

[0041] Furthermore, such as Figure 2 and Figure 3As shown, a support assembly is slidably mounted on the base 1. The support assembly is located between the fixed platform 2 and the fixed seat 3. The support assembly includes a support platform 12, which is slidably mounted on the base 1. The sliding direction of the support platform 12 is parallel to the length direction of the H-beam. A connecting groove 13 is provided on the support platform 12, which passes through the support platform 12. The H-beam can pass through the connecting groove 13. A lower support roller 14 is rotatably mounted at the bottom of the connecting groove 13, and an upper support roller 15 is rotatably mounted at the top of the connecting groove 13. The H-beam is located between the lower support roller 14 and the upper support roller 15. The lower support roller 14 and the upper support roller 15 roll contact with the lower and upper end faces of the H-beam and can clamp the H-beam. When the H-beam sways up and down, the lower support roller 14 and the upper support roller 15 can support the upper and lower end faces of the H-beam. At this time, fatigue testing can be performed on the support points of the upper support roller 15 and the lower support roller 14. By sliding the support assembly on the base 1, fatigue testing can be performed at any position of the H-beam.

[0042] Furthermore, a side roller 16 is rotatably installed inside the connecting groove 13. There are two side rollers 16, which are located on both sides of the H-beam. The side rollers 16 roll in contact with the side plates of the H-beam and can clamp the H-beam. Similarly, when the H-beam sways left and right, the two side rollers 16 can support the H-beam and perform fatigue testing on the contact position between the side rollers 16 and the H-beam.

[0043] Furthermore, connecting rods 25 are provided at both ends of the lower support roller 14, the upper support roller 15, and the side roller 16. The lower support roller 14, the upper support roller 15, and the side roller 16 are all rotatably connected to the connecting rods 25. An adjusting hydraulic cylinder 26 is fixedly connected to the connecting rod 25. The connecting rod 25 is fixedly connected to the piston rod of the adjusting hydraulic cylinder 26. The adjusting hydraulic cylinder 26 is fixedly set in the connecting groove 13. By adjusting the extension and retraction of the piston rod of the adjusting hydraulic cylinder 26, the positions of the lower support roller 14, the upper support roller 15, and the side roller 16 can be adjusted so that they can clamp the H-beam and can adapt to H-beams of different sizes and specifications.

[0044] Furthermore, the base 1 is provided with a sliding groove 17, which is a T-shaped groove. The sliding groove 17 is located between the fixed platform 2 and the fixed seat 3. The lower part of the support platform 12 is slidably disposed in the sliding groove 17, so that the support assembly can slide on the base 1, thereby realizing position adjustment and enabling fatigue detection at any point of the H-beam.

[0045] Furthermore, such as Figure 6As shown, a temperature regulation component is also provided, comprising an upper insulation cover 18 and a lower insulation cover 19. Both the upper and lower insulation covers 18 and 19 are semi-circular in structure and are fixedly connected by snap-fits. The snap-fits and connection methods of the upper and lower insulation covers 18 and 19 are existing technologies and will not be described in detail here. After the upper and lower insulation covers 18 and 19 are closed, they enclose the H-beam. Both the upper and lower insulation covers 18 and 19 are connected to air inlet pipes 20. In this embodiment, when performing fatigue testing on the H-beam, the upper and lower insulation covers 18 and 19 can be closed and fixedly connected. After connection, hot or cold air is blown into the interior through the air inlet pipes 20, thereby regulating the temperature inside the upper and lower insulation covers 18 and 19 to simulate the ambient temperature under the service conditions of the H-beam. Fatigue testing is then performed after temperature regulation, which makes the test results more accurate.

[0046] In another embodiment, connecting blocks 27 are fixedly provided on both the upper insulation cover 18 and the lower insulation cover 19. When the upper insulation cover 18 and the lower insulation cover 19 are closed, the connecting blocks 27 on the upper insulation cover 18 and the connecting blocks 27 on the lower insulation cover 19 abut against each other, and the two connecting blocks 27 are fixedly connected by bolts, thereby fixing the upper insulation cover 18 and the lower insulation cover 19 together.

[0047] It should be noted that one end of the air inlet duct 20 is connected to a hot air blower, and the other end is connected to a refrigeration device. The device can be switched according to the testing requirements. The hot air blower is existing technology, and the refrigeration device can be an air conditioner. The air outlet of the air conditioner is connected to the air inlet duct 20. The air conditioner is also existing technology and will not be described in detail here. When hot air needs to be blown in, the hot air blower is turned on and the air conditioner is turned off at the same time, so that the hot air blown out by the hot air blower is sent into the upper insulation cover 18 and the lower insulation cover 19 through the air inlet duct 20. Similarly, when cold air needs to be blown in, the air conditioner is turned on and the hot air blown off at the same time, so that the cold air is blown into the upper insulation cover 18 and the lower insulation cover 19 for cooling.

[0048] Furthermore, both the upper insulation cover 18 and the lower insulation cover 19 are made of flexible materials, and each has multiple semi-circular steel ring frames inside, allowing them to extend and retract for length adjustment. Since the support assembly needs to be positioned on the base 1, two sets of temperature adjustment components are provided, located on either side of the support assembly. When the support assembly is adjusted, the upper insulation cover 18 and the lower insulation cover 19 extend and retract to adjust their position, enabling them to enclose most of the H-beam, thus stabilizing the ambient temperature of the H-beam and improving detection accuracy.

[0049] Furthermore, the upper insulation cover 18 and the lower insulation cover 19 have the same structure and manufacturing method. They are wrapped with a polymer plastic cloth on the outside, and the inside of the polymer plastic cloth is filled with either slag wool or pearl cotton, which plays a role in heat insulation. The slag wool or pearl cotton is equipped with a semi-circular steel ring skeleton. Multiple steel ring skeletons are arranged in parallel. The steel ring skeleton can play a supporting role, so that the upper insulation cover 18 and the lower insulation cover 19 can maintain a semi-circular structure. The steel ring skeleton can be made of 65Mn spring steel flat wire with a cross-section of 4mm*2.5mm and a semi-circular arc diameter of 450mm.

[0050] Furthermore, baffles 28 are fixedly installed at both ends of the upper insulation cover 18 and the lower insulation cover 19. The baffles 28 have slots and ventilation holes 29. When the upper insulation cover 18 and the lower insulation cover 19 are closed, the H-beam is inserted into the slots of the baffles 28. The two baffles 28 abut against each other and support the upper insulation cover 18 and the lower insulation cover 19. When the air inlet pipe blows air into the interior, the air inside the upper insulation cover 18 and the lower insulation cover 19 can be discharged from the ventilation holes 29, thereby realizing air circulation.

[0051] A fatigue testing method for hot-rolled H-beams includes the following steps:

[0052] S1. Fix one end of the H-beam to the clamping assembly of the fixed platform, and fix the other end to the clamping assembly of the fixed frame;

[0053] S2. Move the support assembly to the measurement position of the H-beam, so that the support assembly can support the H-beam;

[0054] S3. Close the upper and lower insulation covers and wrap them around the H-beam. Blow air into the interior through the air inlet pipe to regulate the internal temperature.

[0055] S4. The clamping assembly is shaken by the extension and retraction of the upper hydraulic cylinder, lower hydraulic cylinder, or translational hydraulic cylinder to perform fatigue testing on the H-beam.

[0056] Furthermore, fatigue testing of H-beams can be divided into conventional fatigue testing and low-temperature fatigue testing. In conventional fatigue testing, the H-beams are subjected to regular shaking and swaying at temperatures of 25°C and 0°C until cracks or fractures appear, and the number of shaking movements at the occurrence of cracks or fractures is recorded. In low-temperature fatigue testing, the H-beams are subjected to irregular shaking and swaying at temperatures of -20°C and -40°C until cracks or fractures appear, and the number of shaking movements at the occurrence of cracks or fractures is recorded.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hot-rolled H-beam fatigue detection device, characterized by, Including the base (1); A fixed platform (2) is provided at one end of the base (1), and a clamping assembly is provided on the fixed platform (2) for clamping one end of the H-beam; The fixing seat (3) is fixedly installed at the other end of the base (1); The movable seat (4) is slidably mounted on the fixed seat (3), and the movable seat (4) is provided with a lower hydraulic cylinder (5). A fixed frame (21) is fixedly mounted on the movable seat (4). An upper hydraulic cylinder (6) is mounted on the fixed frame (21), and a clamping assembly is provided between the upper hydraulic cylinder (6) and the lower hydraulic cylinder (5).

2. The fatigue testing device for hot-rolled H-beams according to claim 1, characterized in that, The clamping assembly includes a fixing block (7), on which an installation groove (8) is provided. A clamping hydraulic cylinder (9) is fixedly installed in the installation groove (8). There are multiple clamping hydraulic cylinders (9), which are evenly arranged along the circumferential direction for clamping and fixing H-beams.

3. The fatigue testing device for hot-rolled H-beams according to claim 2, characterized in that, The outer wall of the fixing block (7) is fixedly provided with a reinforcing ring (10) to enhance the strength of the fixing block (7).

4. The fatigue testing device for hot-rolled H-beams according to claim 1, characterized in that, A translation hydraulic cylinder (11) is fixedly installed on the base (1). There are two translation hydraulic cylinders (11), which are symmetrically arranged on both sides of the movable seat (4). The piston rod of the translation hydraulic cylinder (11) is fixedly connected to the movable seat (4).

5. The fatigue testing device for hot-rolled H-beams according to claim 1, characterized in that, A support assembly is slidably disposed on the base (1). The support assembly is located between the fixed platform (2) and the fixed seat (3). The support assembly includes a support platform (12). The support platform (12) is slidably disposed on the base (1). A connecting groove (13) is provided on the support platform (12). A lower support roller (14) is rotatably disposed at the bottom of the connecting groove (13). An upper support roller (15) is rotatably disposed at the top of the connecting groove (13). The H-beam is located between the lower support roller (14) and the upper support roller (15).

6. The fatigue testing device for hot-rolled H-beams according to claim 5, characterized in that, A side roller (16) is also rotatably arranged in the connecting groove (13). There are two side rollers (16), which are located on both sides of the H-beam.

7. The fatigue testing device for hot-rolled H-beams according to claim 5, characterized in that, The base (1) is provided with a sliding groove (17), which is located between the fixed platform (2) and the fixed seat (3), and the support platform (12) is slidably disposed in the sliding groove (17).

8. The fatigue testing device for hot-rolled H-beams according to claim 1, characterized in that, A temperature regulating component is also provided, which includes an upper insulation cover (18) and a lower insulation cover (19). The upper insulation cover (18) and the lower insulation cover (19) are fixedly connected by a buckle. After the upper insulation cover (18) and the lower insulation cover (19) are closed, they wrap the H-beam. Both the upper insulation cover (18) and the lower insulation cover (19) are connected to an air inlet pipe (20).

9. The fatigue testing device for hot-rolled H-beams according to claim 8, characterized in that, Both the upper insulation cover (18) and the lower insulation cover (19) are made of flexible materials, and both the upper insulation cover (18) and the lower insulation cover (19) are provided with multiple semi-circular steel ring frames.

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