Building steel structure fatigue resistance testing equipment

Abstract

The application relates to the technical field of testing equipment, and provides a building steel structure fatigue resistance testing equipment. The building steel structure fatigue resistance testing equipment comprises a base frame, a loading box arranged on the base frame, a first loading mechanism arranged on the base frame, a second loading mechanism arranged on the base frame, and a detection mechanism arranged on the base frame. A loading station for placing a to-be-detected piece is formed in the loading box, a clamping mechanism for clamping the to-be-detected piece is arranged in the loading station, the first loading mechanism is used for pressing downward along a first direction to exert a force on the to-be-detected piece, and the second loading mechanism is used for twisting around the first direction to exert a force on the to-be-detected piece. The detection mechanism is used for detecting the force borne by the to-be-detected piece and judging the state of the to-be-detected piece according to the force borne by the to-be-detected piece. The building steel structure fatigue resistance testing equipment is beneficial to improving the use quality of the testing equipment.

Description

Technical Field

[0001] This application relates to the field of testing equipment technology, and in particular to a fatigue resistance testing device for building steel structures. Background Technology

[0002] Steel structures are widely used in modern buildings such as long-span bridges, high-rise buildings, stadiums, and heavy industrial plants due to their advantages such as high strength, light weight, and fast construction speed. Throughout their entire life cycle, these structures are subjected to dynamic and cyclical loads such as wind loads, vehicle loads, and pedestrian activity loads.

[0003] Under alternating stress, even if the stress peak is lower than the static yield strength of the material, micro-defects in the structure (especially in stress concentration areas such as welds, bolt holes, and the ends of connecting plates) will gradually expand and form macro-fatigue cracks, which may eventually lead to brittle fracture of the structure and cause serious safety accidents.

[0004] Currently, the industry primarily relies on various material testing machines and structural fatigue testing systems for testing the fatigue performance of steel structures. Most commercially available fatigue resistance testing equipment for building steel structures employs a single-load structure, capable of only performing conventional linear load tests such as compressive and tensile forces in a single direction on steel structure specimens. This simplistic mechanical testing method obtains the stress data of the specimens to determine their fatigue resistance, leading to a significant discrepancy between laboratory assessments of steel structure fatigue performance and their actual service behavior. This hinders the improvement of the quality of testing equipment. Summary of the Invention

[0005] In view of this, this application aims to provide a fatigue resistance testing device for building steel structures to improve the accuracy of test results.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0007] A fatigue resistance testing device for building steel structures includes a base frame, a loading box mounted on the base frame, a first loading mechanism mounted on the base frame, a second loading mechanism mounted on the base frame, and a testing mechanism mounted on the base frame.

[0008] The loading box has a loading station for placing the workpiece to be tested. The loading station is provided with a clamping mechanism for clamping the workpiece to be tested. The first loading mechanism is used to press down in a first direction to apply force to the workpiece to be tested. The second loading mechanism is used to twist around the first direction to apply force to the workpiece to be tested.

[0009] The detection mechanism is used to detect the force applied to the component to be loaded, and to determine the state of the component to be loaded based on the force applied to it.

[0010] Furthermore, the first loading mechanism includes a first driving component and a loading plate that is driveably connected to the first driving component; the clamping mechanism is connected to the loading plate and is used to transmit the force of the loading plate to the workpiece to be tested.

[0011] Furthermore, the first driving assembly includes a first driving member, a lead screw assembly that is driven between the loading plate and the first driving member, and a transmission shaft assembly that is driven by the lead screw assembly; the transmission shaft assembly is connected to the power output end of the first driving member and can receive the drive rotation of the first driving member, and the lead screw assembly is screwed onto the loading plate and can receive the drive rotation of the transmission shaft assembly to drive the loading plate to rise and fall.

[0012] Furthermore, the clamping assembly includes a loading clamping arm, a fixed clamping arm, and a clamping block; a portion of the loading clamping arm extends out of the loading box and is adapted to bear the force of the first loading mechanism or the second loading mechanism, and the fixed clamping arm is fixedly disposed at the bottom of the loading box; both the loading clamping arm and the fixed clamping arm are provided with clamping grooves, and the clamping block is slidably disposed in the clamping grooves and used to clamp the workpiece to be tested.

[0013] Furthermore, the second loading mechanism includes a second driving component and a locking mechanism that is throttle-connected to the second driving component; the locking mechanism is used to lock onto the clamping mechanism, and the second driving component is used to apply a force to the locking mechanism to apply a force to the workpiece to be tested.

[0014] Furthermore, the second drive assembly includes a second drive member, a worm gear, and a worm; the worm gear is fixed on the locking mechanism, and the worm is driven to the power output end of the second drive member. The second drive member is used to drive the worm to rotate, thereby driving the worm gear to rotate.

[0015] Furthermore, the locking mechanism includes a housing, a third driving member disposed within the housing, a transmission assembly disposed within the housing, and a plurality of locking blocks disposed on the transmission assembly; the third driving member is used to drive the transmission assembly to move, so as to drive the locking blocks to lock onto the clamping mechanism.

[0016] Furthermore, each of the transmission components includes a transmission disc, multiple transmission rods, and multiple limiting grooves; each transmission rod and each limiting groove is correspondingly arranged with a locking block, and one end of each transmission rod is connected to the corresponding locking block, the portion of each transmission rod near the locking block is pivotally connected to the transmission disc, and the other end of each transmission rod is slidably disposed in the corresponding limiting groove; when the transmission disc is driven to rotate by the third driving component, each transmission rod slides along the extension direction of the limiting groove, so that the locking block moves closer to or further away from the clamping mechanism.

[0017] Furthermore, the detection mechanism includes a sensor unit disposed on the test piece; the sensor unit includes at least one of a tension / compression sensor, a torque sensor, and a strain sensor.

[0018] Furthermore, the loading box includes a box body, a door hinged to the box body, and a locking element disposed between the door and the box body.

[0019] Compared with related technologies, this application has the following advantages:

[0020] (1) The fatigue resistance testing equipment for building steel structures described in this application integrates a loading box, a first loading mechanism, a second loading mechanism and a testing mechanism on the base frame. A dedicated loading station is formed inside the loading box, and a dedicated clamping mechanism is provided to position and clamp the steel structure to be tested. It can realize the composite loading test of the first direction downward pressure load and the torsional load around the first direction, effectively simulating the complex stress conditions of building steel structures in actual service. At the same time, it can collect the stress data of the specimen in real time and determine the stress state and fatigue damage of the specimen, which is conducive to improving the operation effect of the fatigue resistance test of steel structures and thus improving the quality of use of the testing equipment.

[0021] (2) By connecting the clamping mechanism with the loading plate of the first loading mechanism, the loading plate can receive the power of the first driving component and accurately transmit the downward force to the workpiece to be tested through the clamping mechanism. The power transmission path is short and the loss is small, which effectively ensures the accuracy and stability of the axial downward loading.

[0022] (3) By making the first drive assembly include the first drive component, the transmission shaft assembly and the lead screw assembly, the transmission shaft assembly receives the driving power and drives the lead screw assembly to rotate, thereby accurately driving the loading plate to achieve lifting and lowering motion, completing the pressing and loading operation of the test piece, it can achieve uniform and quantitative pressing load output, accurately control the stroke and force of pressing and loading, meet the fatigue test requirements of different loads, and improve the adaptability of the equipment to different working conditions.

[0023] (4) By making the clamping assembly include a loading clamping arm and a fixed clamping arm, the clamping reference is formed by the corresponding upper and lower clamping arms, and the steel structure specimens of different specifications and sizes are adapted and fixed by the sliding clamping block. The clamping adaptability is strong and the application range is wide. The clamping arm can directly bear the force of the loading mechanism, which can ensure that the force is directly applied to the clamping position of the specimen, the force is uniform and not easy to deviate, improve the stability during the test, and help reduce test errors.

[0024] (5) By making the second loading mechanism include the second driving component and the locking mechanism, the locking mechanism can be stably locked and fixed on the clamping mechanism to ensure that the torsional force can be applied to the test piece. By cooperating with the independent torsional loading structure and the downward loading structure, the pressure-torsion composite fatigue test can be stably realized, highly restoring the actual complex stress scenario of the steel structure, and effectively improving the equipment's working condition simulation capability and test comprehensiveness.

[0025] (6) By making the second drive component include a worm gear and a worm, a stable torsional driving force can be provided for the torsion test, the torsion angle and torsion force can be precisely controlled, the torsion loading process can be guaranteed to be smooth and controllable, and the self-locking characteristics of the worm gear and worm can avoid the reverse displacement of the force during the test, effectively improving the accuracy of the torsion loading test and the stability and safety of the equipment operation.

[0026] (7) By making the locking mechanism include a third driving component, a transmission component and multiple sets of locking blocks, the third driving component drives the transmission component to run, which can simultaneously drive multiple locking blocks to complete the clamping and loosening actions, thereby achieving the locking and fixing of the clamping mechanism. The multi-point locking method is uniformly stressed, which can effectively improve the locking stability and facilitate design and implementation.

[0027] (8) By making the transmission assembly include a transmission disk, a transmission rod and a limiting groove, the transmission disk rotates to drive each transmission rod to slide along the limiting groove in a directional manner, thereby controlling the opening and closing action of the locking block. The limiting groove can constrain the movement trajectory of the transmission rod, ensuring that each locking block moves synchronously, effectively avoiding the problems of loose locking on one side and uneven force, and improving the working stability of the locking mechanism.

[0028] (9) By equipping the testing mechanism with at least one of the following sensors: tension and compression sensors, torque sensors and strain sensors, the testing modules can be flexibly matched according to the testing requirements to collect the corresponding data of the test specimens.

[0029] (10) By making the loading box include a box body, a box door and a locking component, the box door is locked by the locking component. During the test, the test specimen can be sealed inside the box body, which can effectively isolate the interference of external environmental factors. At the same time, it can avoid the safety hazards caused by the breakage of the test specimen or the splashing of debris during the test, which is conducive to design and implementation. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of the fatigue resistance testing equipment for building steel structures described in the embodiments of this application;

[0032] Figure 2 and Figure 3 for Figure 1 Schematic diagrams of the structure shown from other angles;

[0033] Figure 4 This is a partial structural schematic diagram of the fatigue resistance testing equipment for building steel structures described in the embodiments of this application;

[0034] Figure 5 This is a partial structural schematic diagram of the second loading mechanism of the building steel structure fatigue resistance testing equipment described in the embodiments of this application;

[0035] Figure 6 This is a partial structural schematic diagram of the locking mechanism of the fatigue resistance testing equipment for building steel structures described in the embodiments of this application;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Base frame; 2. Loading box; 3. First loading mechanism; 4. Second loading mechanism; 5. Clamping mechanism;

[0038] 101. Guide column; 201. Box body; 202. Box door; 203. Locking component; 301. First drive assembly; 302. Loading plate; 401. Second drive assembly; 402. Locking mechanism; 501. Loading clamping arm; 502. Fixed clamping arm; 503. Clamping block; 504. Fine-tuning mechanism;

[0039] 3011, First driving component; 3012, Lead screw assembly; 3013, Transmission shaft assembly; 4011, Second driving component; 4012, Worm gear; 4013, Worm; 4021, Housing; 4022, Third driving component; 4023, Transmission assembly; 4024, Locking block;

[0040] 30131, Main output shaft; 30132, Cross shaft assembly; 30133, Sub-output shaft; 40231, Transmission disc; 40232, Transmission rod; 40233, Limiting groove. Detailed Implementation

[0041] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0043] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application 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 on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0045] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0047] The first aspect of this application provides a fatigue resistance testing device for building steel structures, which is applied in the testing field and is mainly used to test the fatigue resistance of building steel structures. Furthermore, the fatigue resistance testing device for building steel structures in this embodiment utilizes its innovative structural design to improve the quality of the testing equipment.

[0048] Among related technologies, steel structures are widely used in modern buildings such as long-span bridges, high-rise buildings, stadiums, and heavy industrial plants due to their advantages such as high strength, light weight, and fast construction speed. These structures bear dynamic and cyclical loads such as wind loads, vehicle loads, and pedestrian activity loads throughout their entire life cycle.

[0049] Under alternating stress, even if the stress peak is lower than the static yield strength of the material, micro-defects in the structure (especially in stress concentration areas such as welds, bolt holes, and the ends of connecting plates) will gradually expand and form macro-fatigue cracks, which may eventually lead to brittle fracture of the structure and cause serious safety accidents.

[0050] Currently, the industry primarily relies on various material testing machines and structural fatigue testing systems for testing the fatigue performance of steel structures. Most commercially available fatigue resistance testing equipment for building steel structures employs a single-load structure, capable of only performing conventional linear load tests such as compressive and tensile forces in a single direction on steel structure specimens. This simplistic mechanical testing method obtains the stress data of the specimens to determine their fatigue resistance, leading to a significant discrepancy between laboratory assessments of steel structure fatigue performance and their actual service behavior. This hinders the improvement of the quality of testing equipment.

[0051] In view of this, in order to overcome the shortcomings of related technologies, the fatigue resistance testing equipment for building steel structures in this embodiment combines... Figures 1 to 6 As shown, the overall design includes a base frame 1, a loading box 2 mounted on the base frame 1, a first loading mechanism 3 mounted on the base frame 1, a second loading mechanism 4 mounted on the base frame 1, and a detection mechanism mounted on the base frame 1.

[0052] The loading box 2 has a loading station for placing the workpiece to be tested. The loading station is equipped with a clamping mechanism 5 for clamping the workpiece to be tested. The first loading mechanism 3 is used to press down along the first direction to apply force to the workpiece to be tested. The second loading mechanism 4 is used to twist around the first direction to apply force to the workpiece to be tested. The testing mechanism is used to detect the force on the workpiece to be tested and to determine the state of the workpiece to be tested based on the force on the workpiece to be tested.

[0053] At this point, with the above setup, by integrating the loading box 2, the first loading mechanism 3, the second loading mechanism 4, and the detection mechanism on the base frame 1, a dedicated loading station is formed inside the loading box 2, and a dedicated clamping mechanism 5 is provided to position and clamp the steel structural component to be tested. This enables the composite loading test of the downward pressure load in the first direction and the torsional load around the first direction, effectively simulating the complex stress conditions of the building steel structure during actual service. At the same time, it can collect the stress data of the specimen in real time and determine the stress state and fatigue damage of the specimen, which is beneficial to improving the operation effect of the fatigue performance test of the steel structure and improving the quality of the test equipment.

[0054] Based on the above overview, specifically, the fatigue resistance testing equipment for building steel structures in this embodiment is mainly used to conduct fatigue resistance tests on the test pieces simulating building steel structures.

[0055] The aforementioned first direction can be, for example, the overall height of the equipment. When manufacturing the test piece, the actual steel structure of the building can be replicated based on the experience of those skilled in the art, so that the test results more closely reflect actual usage conditions. The fatigue testing requirements for the aforementioned steel structure can be set with reference to testing requirements well-known to those skilled in the art, and will not be elaborated further here.

[0056] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, include a first loading mechanism 3 including a first drive component 301 and a loading plate 302 that is driveably connected to the first drive component 301.

[0057] The clamping mechanism 5 is connected to the loading plate 302 and is used to transfer the force of the loading plate 302 to the workpiece to be tested.

[0058] It is understandable that by connecting the clamping mechanism 5 with the loading plate 302 of the first loading mechanism 3, the loading plate 302 can receive the power of the first driving component 301 and accurately transmit the downward pressure force to the workpiece to be tested through the clamping mechanism 5. The power transmission path is short and the loss is small, which effectively ensures the accuracy and stability of the axial downward pressure loading.

[0059] In specific implementation, the connection between the clamping mechanism 5 and the loading plate 302 can be, for example, by fasteners. The clamping mechanism 5 is provided with a threaded part, and the fastener can be, for example, a threaded ring structure. Both fasteners are screwed onto the threaded part and are located on the upper and lower sides of the loading plate 302 respectively, so as to fasten the loading plate 302 to the clamping mechanism 5.

[0060] Furthermore, the clamping mechanism 5 is rotatably connected to the loading plate 302, and when the first loading mechanism 3 and the second loading mechanism 4 apply force together, there is no mutual influence between them.

[0061] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, include a first drive assembly 301 including a first drive member 3011, a lead screw assembly 3012 that is driveably connected between the loading plate 302 and the first drive member 3011, and a drive shaft assembly 3013 that is driveably connected to the lead screw assembly 3012.

[0062] The drive shaft assembly 3013 is connected to the power output end of the first drive member 3011 and can be driven to rotate by the first drive member 3011. The lead screw assembly 3012 is screwed onto the loading plate 302 and can be driven to rotate by the drive shaft assembly 3013 to drive the loading plate 302 to rise and fall.

[0063] It is understandable that by making the first drive assembly 301 include the first drive member 3011, the transmission shaft assembly 3013 and the lead screw assembly 3012, the transmission shaft assembly 3013 receives the driving power and drives the lead screw assembly 3012 to rotate, thereby precisely driving the loading plate 302 to achieve lifting and lowering movement, completing the pressing and loading operation of the workpiece to be tested. It can achieve uniform and quantitative pressing load output, accurately control the stroke and force of the pressing and loading, meet the fatigue test requirements of different loads, and improve the adaptability of the equipment to different working conditions.

[0064] In a specific implementation, the first driving component 3011 may be a hydraulic motor, and the transmission shaft assembly 3013 may include a main output shaft 30131 connected to the power output end of the hydraulic motor, a cross shaft assembly 30132 connected to the main output shaft 30131, and a branch output shaft 30133 connected between the cross shaft assembly 30132 and the lead screw assembly 3012.

[0065] The first driving component 3011 may also be a motor (such as a servo motor). The lead screw assembly 3012 may include two lead screws, which are respectively located on both sides of the loading box 2. The base frame 1 includes multiple guide posts 101, each of which passes through the loading plate 302 to guide the movement of the loading plate 302.

[0066] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, make the clamping assembly include a loading clamping arm 501, a fixing clamping arm 502, and a clamping block 503.

[0067] The loading clamping arm 501 extends out of the loading box 2 and is adapted to bear the force of the first loading mechanism 3 or the second loading mechanism 4. The fixed clamping arm 502 is fixed to the bottom of the loading box 2. Both the loading clamping arm 501 and the fixed clamping arm 502 are provided with clamping grooves. The clamping block 503 is slidably disposed in the clamping groove and is used to clamp the workpiece to be tested.

[0068] It is understandable that by making the clamping assembly include a loading clamping arm 501 and a fixed clamping arm 502, a clamping reference is formed by the corresponding upper and lower clamping arms, and the sliding clamping block 503 is used to adapt and fix steel structure specimens of different specifications and sizes. The clamping adaptability is strong and the application range is wide. Moreover, the clamping arm can directly bear the force of the loading mechanism, which can ensure that the force is directly applied to the clamping position of the specimen, the force is uniform and not easy to deviate, improve the stability during the test, and help reduce test errors.

[0069] In specific implementation, the threaded part of the clamping mechanism 5 is formed on the part of the loading clamping arm 501 that extends out of the loading box 2. The two ends of the workpiece to be tested can be respectively accommodated in the corresponding clamping grooves. The clamping block 503 can be pre-processed according to the end shape of the workpiece to be tested and assembled in the clamping groove.

[0070] In addition, the clamping mechanism 5 may also be provided with a fine adjustment mechanism 504. The fine adjustment mechanism 504 includes an adjusting rod and an adjusting block provided on the adjusting rod. The two ends of the adjusting rod are respectively provided with threads in opposite directions. Correspondingly, the adjusting block is provided with a corresponding thread. When the adjusting rod rotates, the two adjusting blocks can move closer or further away from each other. The clamping block 503 is mounted on the adjusting block with a pin.

[0071] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, include a second loading mechanism 4 including a second driving component 401 and a locking mechanism 402 that is driveably connected to the second driving component 401. The locking mechanism 402 is used to lock onto the clamping mechanism 5, and the second driving component 401 is used to apply a force to the locking mechanism 402 to apply a force to the workpiece to be tested.

[0072] It is understandable that by making the second loading mechanism 4 include the second driving component 401 and the locking mechanism 402, the locking mechanism 402 can be stably locked and fixed on the clamping mechanism 5, ensuring that the torsional force can be applied to the test piece. Through the cooperation of the independent torsional loading structure and the downward loading structure, the combined pressure and torsional fatigue test can be stably realized, highly restoring the actual complex stress scenario of the steel structure, and effectively improving the equipment's working condition simulation capability and test comprehensiveness.

[0073] Continue to combine Figures 1 to 6As shown, in some exemplary embodiments, this embodiment may, for example, include a second drive assembly 401 comprising a second drive member 4011, a worm gear 4012, and a worm 4013.

[0074] The worm gear 4012 is fixed on the locking mechanism 402, and the worm 4013 is connected to the power output end of the second driving member 4011. The second driving member 4011 is used to drive the worm 4013 to rotate, so as to drive the worm gear 4012 to rotate.

[0075] It is understandable that by making the second drive assembly 401 include the worm gear 4012 and the worm 4013, a stable torsional driving force can be provided for the torsion test, the torsion angle and torsion force can be precisely controlled, and the torsion loading process can be guaranteed to be smooth and controllable. The self-locking characteristics of the worm gear 4012 and the worm 4013 can prevent the force from shifting in the opposite direction during the test, effectively improving the accuracy of the torsion loading test and the stability and safety of the equipment operation.

[0076] In specific implementation, the second driving member 4011 can be, for example, a hydraulic motor. The power output end of the second driving member 4011 is connected to the worm gear 4013. The worm wheel 4012 is fixed on the housing 4021 of the locking mechanism 402 and can drive the locking mechanism 402 to rotate together under the drive of the worm gear 4013. Thus, when the locking mechanism 402 locks the clamping mechanism 5, a force is applied to the clamping mechanism 5 through the locking mechanism 402.

[0077] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, include a locking mechanism 402 comprising a housing 4021, a third drive member 4022 disposed within the housing 4021, a transmission assembly 4023 disposed within the housing 4021, and a plurality of locking blocks 4024 disposed on the transmission assembly 4023.

[0078] The third driving component 4022 is used to drive the transmission component 4023 to move, so as to lock the locking block 4024 onto the clamping mechanism 5.

[0079] It is understandable that by making the locking mechanism 402 include a third driving member 4022, a transmission component 4023 and multiple sets of locking blocks 4024, the third driving member 4022 drives the transmission component 4023 to run, which can simultaneously drive multiple locking blocks 4024 to complete the clamping and loosening actions, thereby achieving the locking and fixing of the clamping mechanism 5. The multi-point locking method distributes the force evenly, which can effectively improve the locking stability and facilitate design and implementation.

[0080] In specific implementation, the aforementioned third driving component 4022 may be, for example, a hydraulic cylinder. The hydraulic cylinder drives the transmission component 4023 to move the locking block 4024 to lock and fix the clamping mechanism 5. That is, the hydraulic cylinder drives the locking block 4024 to abut against the loading clamping arm through the transmission component 4023.

[0081] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, include a transmission assembly 4023 comprising a transmission disk 40231, a plurality of transmission rods 40232, and a plurality of limiting grooves 40233.

[0082] The transmission rod 40232 and the limiting groove 40233 are respectively provided with corresponding locking blocks 4024. One end of each transmission rod 40232 is connected to the corresponding locking block 4024. The part of each transmission rod 40232 near the locking block 4024 is pivotally connected to the transmission disk 40231. The other end of each transmission rod 40232 is slidably disposed in the corresponding limiting groove 40233. When the transmission disk 40231 is driven to rotate by the third driving component, each transmission rod 40232 slides along the extension direction of the limiting groove 40233 so that the locking block 4024 is close to or away from the clamping mechanism 5.

[0083] It is understandable that by making the transmission assembly 4023 include the transmission disk 40231, the transmission rod 40232 and the limiting groove 40233, the rotation of the transmission disk 40231 drives each transmission rod 40232 to slide in a direction along the limiting groove 40233, thereby controlling the opening and closing action of the locking block 4024. The limiting groove 40233 can constrain the movement trajectory of the transmission rod 40232, ensuring that each locking block 4024 moves synchronously, effectively avoiding the problems of loose locking on one side and uneven force, and improving the working stability of the locking mechanism 402.

[0084] In specific implementation, one end of the aforementioned transmission rod 40232 is pivotally connected to the limiting groove 40233, and the part of the transmission rod 40232 near the other end is pivotally connected to the transmission disc 40231. There are three transmission rods 40232 and three limiting grooves 40233. There are also three locking blocks 4024 that cooperate with it. When the transmission disc 40231 rotates, the transmission rod 40232 drives the locking blocks 4024 away from or closer to the loading clamping arm.

[0085] In addition, to further enhance the clamping effect, the locking block 4024 may be formed with a groove that matches the loading clamping arm. When the locking block 4024 is pressed against the loading clamping arm, the groove portion abuts against the loading clamping arm. The locking block 4024 may be made of rubber, for example.

[0086] Continue to combine Figures 1 to 6As shown, in some exemplary embodiments, this embodiment may, for example, include a detection mechanism comprising a sensor unit disposed on the object to be detected, the sensor unit comprising at least one of a tension / compression sensor, a torque sensor, and a strain sensor.

[0087] Understandably, by equipping the testing facility with at least one of the following sensors: tension / compression sensors, torque sensors, and strain sensors, testing modules can be flexibly combined according to testing requirements to collect corresponding data from the specimens.

[0088] In practical implementation, the aforementioned tension / compression sensors, torque sensors, and strain gauge sensors can be selected based on relevant parameters familiar to those skilled in the art. The assembly methods of these sensors can also be set according to assembly methods familiar to those skilled in the art, and will not be elaborated further here. Furthermore, in addition to the aforementioned sensors, those skilled in the art may add other sensors as needed.

[0089] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, include a loading box 2 comprising a box body 201, a door 202 hinged to the box body 201, and a locking member 203 disposed between the door 202 and the box body 201.

[0090] It is understandable that by making the loading box 2 include a box body 201, a box door 202 and a locking element 203, and by locking the box door 202 through the locking element 203, the test specimen can be sealed inside the box body 201 during the test, which can effectively isolate the interference of external environmental factors, and at the same time avoid the safety hazards caused by the breakage of the test specimen or the splashing of debris during the test, which is conducive to design and implementation.

[0091] In practical implementation, the aforementioned door 202 may be provided with a transparent part to facilitate observation of the internal situation. In use, the door 202 is locked to the box body 201 by a locking member 203. The locking member 203 may be a latch structure, and a corresponding matching structure is also provided on the box body 201. The transparent part on the aforementioned door 202 may be made of a transparent material with a certain strength (such as thickened transparent acrylic material). In actual implementation, the selection can be made according to the needs of those skilled in the art, and will not be elaborated here.

[0092] It is worth noting that, regarding the fatigue resistance testing equipment for building steel structures in this embodiment, based on the above exemplary implementations, in specific implementation, as a preferred embodiment, it is still provided by Figures 1 to 6 As shown, it may include, for example, a base frame 1, a loading box 2 disposed on the base frame 1, a first loading mechanism 3 disposed on the base frame 1, a second loading mechanism 4 disposed on the base frame 1, and a detection mechanism disposed on the base frame 1.

[0093] The loading box 2 has a loading station for placing the workpiece to be tested. The loading station is equipped with a clamping mechanism 5 for clamping the workpiece to be tested. The first loading mechanism 3 is used to press down along the first direction to apply force to the workpiece to be tested. The second loading mechanism 4 is used to twist around the first direction to apply force to the workpiece to be tested. The testing mechanism is used to detect the force on the workpiece to be tested and to determine the state of the workpiece to be tested based on the force on the workpiece to be tested.

[0094] The first loading mechanism 3 includes a first driving assembly 301 and a loading plate 302 that is driveably connected to the first driving assembly 301. A clamping mechanism 5 is connected to the loading plate 302 and is used to transmit the force of the loading plate 302 to the workpiece to be tested. The first driving assembly 301 includes a first driving member 3011, a lead screw assembly 3012 that is driveably connected between the loading plate 302 and the first driving member 3011, and a transmission shaft assembly 3013 that is driveably connected to the lead screw assembly 3012. The transmission shaft assembly 3013 is connected to the power output end of the first driving member 3011 and can receive the drive rotation of the first driving member 3011. The lead screw assembly 3012 is screwed onto the loading plate 302 and can receive the drive rotation of the transmission shaft assembly 3013 to drive the loading plate 302 to rise and fall.

[0095] The clamping assembly includes a loading clamping arm 501, a fixed clamping arm 502, and a clamping block 503. A portion of the loading clamping arm 501 extends out of the loading box 2 and is adapted to bear the force of the first loading mechanism 3 or the second loading mechanism 4. The fixed clamping arm 502 is fixedly mounted on the bottom of the loading box 2. Both the loading clamping arm 501 and the fixed clamping arm 502 are provided with clamping grooves. The clamping block 503 is slidably disposed in the clamping grooves and is used to clamp the workpiece to be tested.

[0096] The second loading mechanism 4 includes a second driving assembly 401 and a locking mechanism 402 that is throttle-connected to the second driving assembly 401. The locking mechanism 402 is used to lock onto the clamping mechanism 5. The second driving assembly 401 is used to apply a force to the locking mechanism 402 to apply a force to the workpiece to be tested. The second driving assembly 401 includes a second driving member 4011, a worm gear 4012, and a worm 4013. The worm gear 4012 is fixed on the locking mechanism 402. The worm 4013 is throttle-connected to the power output end of the second driving member 4011. The second driving member 4011 is used to drive the worm 4013 to rotate, thereby driving the worm gear 4012 to rotate.

[0097] The locking mechanism 402 includes a housing 4021, a third driving member 4022 disposed within the housing 4021, a transmission assembly 4023 disposed within the housing 4021, and a plurality of locking blocks 4024 disposed on the transmission assembly 4023. The third driving member 4022 is used to drive the transmission assembly 4023 to move, thereby causing the locking blocks 4024 to lock onto the clamping mechanism 5. The detection mechanism includes a sensor unit disposed on the object to be detected. The sensor unit includes a tension / compression sensor, a torque sensor, and a strain sensor. The loading box 2 includes a box body 201, a door 202 hinged to the box body 201, and a locking member 203 disposed between the door 202 and the box body 201.

[0098] The transmission assembly 4023 includes a transmission disk 40231, multiple transmission rods 40232, and multiple limiting grooves 40233. The transmission rods 40232 and the limiting grooves 40233 are each corresponding to the locking blocks 4024. One end of each transmission rod 40232 is connected to the corresponding locking block 4024. The part of each transmission rod 40232 near the locking block 4024 is pivotally connected to the transmission disk 40231. The other end of each transmission rod 40232 is slidably disposed in the corresponding limiting groove 40233. When the transmission disk 40231 is driven to rotate by the third drive assembly, each transmission rod 40232 slides along the extension direction of the limiting groove 40233 so that the locking block 4024 moves closer to or away from the clamping mechanism 5.

[0099] In the preferred embodiment of the above-mentioned fatigue resistance testing equipment for building steel structures, the specific settings and arrangements of the base frame 1, loading box 2, first loading mechanism 3, etc. can still be referred to the descriptions in the above-mentioned exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the base frame 1, loading box 2, and first loading mechanism 3, etc., can also be referred to the descriptions in the above-mentioned exemplary embodiments.

[0100] The fatigue resistance testing equipment for building structural steel in this embodiment adopts the above design, forming a dedicated loading station inside the loading box 2, which can position and clamp the steel structural component to be tested. It can realize the composite loading test of the downward compressive load in the first direction and the torsional load around the first direction, effectively simulating the complex stress conditions of building steel structures in actual service. At the same time, it can collect the stress data of the specimen in real time and determine the stress state and fatigue damage of the specimen, which is conducive to improving the operation effect of the fatigue resistance testing of steel structures and improving the quality of use of the testing equipment.

[0101] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A fatigue resistance testing device for building steel structures, characterized in that: It includes a base frame (1), a loading box (2) disposed on the base frame (1), a first loading mechanism (3) disposed on the base frame (1), a second loading mechanism (4) disposed on the base frame (1), and a detection mechanism disposed on the base frame (1); The loading box (2) has a loading station for placing the test piece. The loading station is provided with a clamping mechanism (5) for clamping the test piece. The first loading mechanism (3) is used to press down in a first direction to apply force to the test piece. The second loading mechanism (4) is used to twist around the first direction to apply force to the test piece. The detection mechanism is used to detect the force applied to the component to be loaded, and to determine the state of the component to be loaded based on the force applied to it.

2. The fatigue resistance testing equipment for building steel structures according to claim 1, characterized in that: The first loading mechanism (3) includes a first driving component (301) and a loading plate (302) that is drivenly connected to the first driving component (301). The clamping mechanism (5) is connected to the loading plate (302) and is used to transmit the force of the loading plate (302) to the test piece.

3. The fatigue resistance testing equipment for building steel structures according to claim 2, characterized in that: The first drive assembly (301) includes a first drive member (3011), a lead screw assembly (3012) that is driveably connected between the loading plate (302) and the first drive member (3011), and a drive shaft assembly (3013) that is driveably connected to the lead screw assembly (3012). The drive shaft assembly (3013) is connected to the power output end of the first drive member (3011) and can be driven to rotate by the first drive member (3011). The lead screw assembly (3012) is screwed onto the loading plate (302) and can be driven to rotate by the drive shaft assembly (3013) to drive the loading plate (302) to rise and fall.

4. The fatigue resistance testing equipment for building steel structures according to claim 1, characterized in that: The clamping assembly includes a loading clamping arm (501), a fixing clamping arm (502), and a clamping block (503); A portion of the loading clamping arm (501) extends out of the loading box (2) and is adapted to bear the force of the first loading mechanism (3) or the second loading mechanism (4), and the fixed clamping arm (502) is fixed to the bottom of the loading box (2); Both the loading clamping arm (501) and the fixing clamping arm (502) are provided with clamping grooves, and the clamping block (503) is slidably disposed in the clamping grooves and used to clamp the test piece.

5. The fatigue resistance testing equipment for building steel structures according to claim 1, characterized in that: The second loading mechanism (4) includes a second drive assembly (401) and a locking mechanism (402) that is drive-connected to the second drive assembly (401). The locking mechanism (402) is used to lock onto the clamping mechanism (5), and the second drive assembly (401) is used to apply force to the locking mechanism (402) to apply force to the test piece.

6. The fatigue resistance testing equipment for building steel structures according to claim 5, characterized in that: The second drive assembly (401) includes a second drive member (4011), a worm gear (4012), and a worm (4013). The worm wheel (4012) is fixed on the locking mechanism (402), and the worm (4013) is connected to the power output end of the second driving member (4011). The second driving member (4011) is used to drive the worm (4013) to rotate, so as to drive the worm wheel (4012) to rotate.

7. The fatigue resistance testing equipment for building steel structures according to claim 5, characterized in that: The locking mechanism (402) includes a housing (4021), a third driving member (4022) disposed in the housing (4021), a transmission assembly (4023) disposed in the housing (4021), and a plurality of locking blocks (4024) disposed on the transmission assembly (4023). The third driving member (4022) is used to drive the transmission assembly (4023) to move, so as to drive the locking block (4024) to lock onto the clamping mechanism (5).

8. The fatigue resistance testing equipment for building steel structures according to claim 7, characterized in that: Each of the transmission components (4023) includes a transmission disc (40231), multiple transmission rods (40232), and multiple limiting grooves (40233). The transmission rod (40232) and the limiting groove (40233) are each corresponding to the locking block (4024), and one end of each transmission rod (40232) is connected to the corresponding locking block (4024). The part of each transmission rod (40232) near the locking block (4024) is pivotally connected to the transmission disc (40231), and the other end of each transmission rod (40232) is slidably disposed in the corresponding limiting groove (40233). When the transmission disc (40231) is driven to rotate by the third drive assembly, each of the transmission rods (40232) slides along the extension direction of the limiting groove (40233) so that the locking block (4024) moves closer to or further away from the clamping mechanism (5).

9. The fatigue resistance testing equipment for building steel structures according to any one of claims 1-8, characterized in that: The detection mechanism includes a sensor unit disposed on the component to be tested; The sensor unit includes at least one of a tension / compression sensor, a torque sensor, and a strain gauge sensor.

10. The fatigue resistance testing equipment for building steel structures according to claim 9, characterized in that: The loading box (2) includes a box body (201), a box door (202) hinged to the box body (201), and a locking member (203) disposed between the box door (202) and the box body (201).

Images