A steel truss connecting node mechanical property testing device

Abstract

This application relates to a mechanical performance testing device for steel truss connection nodes, belonging to the technical field of stadium construction. It includes a base, with a supporting wall fixedly connected to the upper surface of the base. A transverse support is fixedly connected to the inner wall of the supporting wall. Two transverse fixed rods are fixedly connected inside the transverse support. A first transverse moving seat is slidably sleeved on the outer circumferential surface of the two transverse fixed rods. A longitudinal support is fixedly connected to the side of the transverse moving seat away from the transverse support. This application uses a drive motor to drive a drive gear to rotate, causing the drive gear to mesh with an internal gear ring. This drives the transverse and longitudinal moving seats to move along the semi-circular transverse and longitudinal fixed rods as tracks, respectively. This allows for multi-angle adjustment of the force direction of the connection point to be tested, simulating the multi-directional force state of the node in an actual structure, ensuring the accuracy and comprehensiveness of the test results.

Description

Technical Field

[0001] This application relates to the field of stadium construction technology, and in particular to a mechanical performance testing device for steel truss connection nodes. Background Technology

[0002] Steel truss structures have become the preferred structural form for large-span buildings, bridge projects, and industrial plants due to their significant advantages such as high strength, lightweight, and convenient construction. Among them, the connection nodes, as the core force transmission hubs of steel truss structures, directly determine the load-bearing capacity, deformation coordination, and disaster resistance of the overall structure, and are a key link in ensuring project safety.

[0003] In existing technologies, the mechanical performance testing of steel truss connection nodes mostly relies on unidirectional loading devices, which makes it difficult to simulate the multidirectional stress state of the node in the actual structure, resulting in deviations between the test results and the actual stress state. Utility Model Content

[0004] The purpose of this application is to provide a mechanical performance testing device for steel truss connection nodes, which can adjust the force direction of the connection node from multiple angles, simulate the multi-directional force state of the node in the actual structure, ensure the accuracy and comprehensiveness of the test results, and solve the problems mentioned in the background art.

[0005] The mechanical performance testing device for steel truss connection nodes provided in this application adopts the following technical solution: A mechanical performance testing device for steel truss connection nodes includes a base, a supporting wall fixedly connected to the upper surface of the base, a transverse support fixedly connected to the inner wall of the supporting wall, two transverse fixed rods fixedly connected inside the transverse support, a first transverse moving seat slidably sleeved on the outer circumferential surface of the two transverse fixed rods, a longitudinal support fixedly connected to the side of the transverse moving seat away from the transverse support, two longitudinal fixed rods fixedly connected inside the longitudinal support, a longitudinal moving seat slidably sleeved on the outer circumferential surface of the two longitudinal fixed rods, a first hydraulic cylinder installed on the side of the longitudinal moving seat away from the longitudinal support, a tension sensor fixedly connected to the output end of the first hydraulic cylinder, a fixing ring fixedly connected to the outer surface of the tension sensor, a drive motor installed on the side of the transverse moving seat and the longitudinal moving seat near the supporting wall, a drive gear fixedly connected to the output end of each drive motor, and an internal gear ring fixedly connected to the inner wall of the transverse support and the longitudinal support, the drive gear meshing with the internal gear ring respectively.

[0006] By adopting the above technical solution, the drive motor drives the drive gear to rotate, so that the drive gear meshes with the internal gear ring, and drives the transverse moving seat and the longitudinal moving seat to move along the transverse fixed rod and the longitudinal fixed rod as tracks, respectively. In this way, the force direction of the connection point to be tested can be adjusted at multiple angles, simulating the multi-directional force state of the node in the actual structure, and ensuring the accuracy and comprehensiveness of the test results.

[0007] Preferably, the supporting wall, the transverse bracket, the transverse fixing rod, the longitudinal bracket, and the longitudinal fixing rod are all arranged in a semi-circular shape.

[0008] By adopting the above technical solution, this semi-ring structure design enables the lateral and longitudinal moving seats to better match the force trajectory that may occur at the steel truss connection nodes in actual engineering during movement. This allows for a more comprehensive simulation of the force on the connection nodes from multiple angles. Compared with straight or other regular-shaped structures, the semi-ring structure can cover a wider range of force directions, thereby more accurately simulating the multi-directional force state of the nodes in the actual structure. This improves the accuracy and reliability of the test results and provides more realistic data support for the mechanical performance evaluation of steel truss connection nodes.

[0009] Preferably, reinforcing rods arranged at equal intervals are fixedly connected between the transverse support and the transverse fixing rod, and between the longitudinal support and the longitudinal fixing rod.

[0010] By adopting the above technical solution, the reinforcement rod significantly enhances the structural strength and stability of the entire testing device, effectively disperses the stress generated during the testing process, and prevents the transverse support, transverse fixing rod, longitudinal support and longitudinal fixing rod from deforming or being damaged due to excessive force, thus ensuring the stability and reliability of the testing device during long-term use.

[0011] Preferably, the top and bottom of the inner wall of the supporting wall are fixedly connected to a supporting arm, and the upper and bottom surfaces of the longitudinal bracket are fixedly connected to a rotating shaft, the outer circumferential surface of the rotating shaft being rotatably connected to the inside of the supporting arm.

[0012] By adopting the above technical solution, additional support is provided for the longitudinal support. When the lateral moving seat drives the longitudinal support to move and the longitudinal moving seat moves on the longitudinal support, the combination of the support arm and the rotating shaft can ensure the smooth movement of the longitudinal support and reduce swaying and deviation during the movement.

[0013] Preferably, the tension sensor is electrically connected to the external control platform, and a high-definition camera is fixedly connected to the outer surface of the longitudinal moving seat via a mounting plate, and the high-definition camera is electrically connected to the external control platform.

[0014] By adopting the above technical solution, the tension sensor is electrically connected to the external control platform, which can transmit the tensile force data borne by the connection node during the test to the control platform in real time and accurately. This allows operators to monitor and analyze the changes in tension in real time and grasp the mechanical performance status of the connection node in a timely manner. The high-definition camera can record the deformation, damage and other appearance changes of the connection node during the test in real time and transmit the image information to the external control platform. Operators can combine the tensile data and image information to gain a more comprehensive and intuitive understanding of the mechanical performance of the connection node under different stress states, providing richer evidence for the quality assessment, fault diagnosis and improvement design of steel truss connection nodes.

[0015] Preferably, the inner wall of the supporting wall is equipped with lighting lamps arranged at equal intervals.

[0016] By adopting the above technical solution, the lighting can provide sufficient and uniform light to the test area during the test, ensuring that the high-definition camera can clearly capture the detailed changes of the connection nodes.

[0017] Preferably, a positioning seat is fixedly connected to the upper surface of the base, and a base plate and a second hydraulic cylinder are fixedly connected to the side of the positioning seat near the supporting wall. The second hydraulic cylinder is located above the base plate, and a positioning plate is fixedly connected to the output end of the second hydraulic cylinder. Positioning rods arranged at equal intervals are fixedly connected to the bottom surface of the positioning plate, and through holes corresponding to the positioning rods are opened inside the base plate.

[0018] By adopting the above technical solution, when placing the test specimen, the second hydraulic cylinder retracts and the positioning plate lifts up, making it easier to place the test specimen on the base plate. After the test specimen is placed, the second hydraulic cylinder extends and pushes the positioning plate downward. The positioning rod passes through the through holes on the test specimen and the base plate, firmly fixing the test specimen in the designated position, ensuring that the test specimen will not move or shift during the test, and guaranteeing the accuracy and stability of the test.

[0019] Preferably, two sliders are fixedly connected to the outer surface of the positioning plate, and a limiting plate is fixedly connected to the side of each slider away from the positioning plate. The slider is slidably connected to the positioning seat through a groove opened inside the positioning seat, and the outer surface of the limiting plate is slidably connected to the inner wall of the positioning seat.

[0020] By adopting the above technical solution, when the second hydraulic cylinder pushes the positioning plate to move up and down, the slider slides in the groove of the positioning seat, which provides guidance for the movement of the positioning plate and prevents the positioning plate from shifting or shaking during the movement. The limiting plate restricts and reinforces the positioning plate, avoids misalignment and shifting of the positioning plate during the test, and improves the stability of the positioning plate during the test operation.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] This device for testing the mechanical properties of steel truss connection nodes uses a drive motor to rotate a drive gear, which meshes with an internal gear ring. This causes the transverse and longitudinal moving seats to move along semi-circular fixed rods as tracks, allowing for multi-angle adjustment of the force direction at the connection point under test. This simulates the multi-directional force state of the node in the actual structure, ensuring the accuracy and comprehensiveness of the test results. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this application;

[0024] Figure 2 This is a schematic diagram of the horizontal and vertical support structures of this application;

[0025] Figure 3 This is a schematic diagram of the structure of the first hydraulic cylinder in this application;

[0026] Figure 4 This is a schematic diagram of the positioning seat structure of this application;

[0027] Figure 5 This is a schematic diagram of the limiting plate structure in this application.

[0028] In the picture:

[0029] 1. Base; 2. Supporting wall; 3. Horizontal bracket; 4. Horizontal fixing rod; 5. Horizontal moving seat; 6. Longitudinal bracket; 7. Longitudinal fixing rod; 8. Longitudinal moving seat; 9. First hydraulic cylinder; 10. Tension sensor; 11. Fixing ring; 12. Drive motor; 13. Drive gear; 14. Internal gear ring; 15. Positioning seat; 16. Base plate; 17. Second hydraulic cylinder; 18. Positioning plate; 19. Positioning rod; 20. Reinforcing rod; 21. Support arm; 22. Rotating shaft; 23. High-definition camera; 24. Lighting lamp; 25. Slider; 26. Limiting plate. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0031] Example 1: A mechanical performance testing device for steel truss connection nodes, referring to... Figure 1 , Figure 2 and Figure 3The system includes a base 1, a supporting wall 2 fixedly connected to the upper surface of the base 1, a transverse bracket 3 fixedly connected to the inner wall of the supporting wall 2, two transverse fixing rods 4 fixedly connected inside the transverse bracket 3, a first transverse moving seat 5 slidably sleeved on the outer circumferential surface of the two transverse fixing rods 4, a longitudinal bracket 6 fixedly connected to the side of the transverse moving seat 5 away from the transverse bracket 3, two longitudinal fixing rods 7 fixedly connected inside the longitudinal bracket 6, a longitudinal moving seat 8 slidably sleeved on the outer circumferential surface of the two longitudinal fixing rods 7, a first hydraulic cylinder 9 installed on the side of the longitudinal moving seat 8 away from the longitudinal bracket 6, a tension sensor 10 fixedly connected to the output end of the first hydraulic cylinder 9, a fixing ring 11 fixedly connected to the outer surface of the tension sensor 10, a drive motor 12 installed on the side of the transverse moving seat 5 and the longitudinal moving seat 8 near the supporting wall 2, a drive gear 13 fixedly connected to the output end of each drive motor 12, and an internal gear ring 14 fixedly connected to the inner wall of the transverse bracket 3 and the longitudinal bracket 6, with the drive gear 13 meshing with the internal gear ring 14 respectively.

[0032] The supporting wall 2, transverse bracket 3, transverse fixing rod 4, longitudinal bracket 6, and longitudinal fixing rod 7 are all arranged in a semi-circular shape. This semi-circular structure design allows the transverse moving seat 5 and the longitudinal moving seat 8 to more closely match the force trajectory that may occur at the steel truss connection node in actual engineering during movement. This enables a more comprehensive simulation of the force on the connection node from multiple angles. Compared with straight or other regular-shaped structures, the semi-circular structure can cover a wider range of force directions, thereby more accurately simulating the multi-directional force state of the node in the actual structure, improving the accuracy and reliability of the test results, and providing more realistic data support for the mechanical performance evaluation of the steel truss connection node.

[0033] Equally spaced reinforcing rods 20 are fixedly connected between the transverse support 3 and the transverse fixing rod 4, and between the longitudinal support 6 and the longitudinal fixing rod 7. The setting of the reinforcing rods 20 significantly enhances the structural strength and stability of the entire testing device, effectively disperses the stress generated during the testing process, and prevents the transverse support 3, the transverse fixing rod 4, the longitudinal support 6, and the longitudinal fixing rod 7 from deforming or being damaged due to excessive force, thus ensuring the stability and reliability of the testing device during long-term use.

[0034] Support arms 21 are fixedly connected to the top and bottom of the inner wall of the supporting wall 2. Rotating shafts 22 are fixedly connected to the upper and bottom surfaces of the longitudinal support 6. The outer circumferential surface of the rotating shaft 22 is rotatably connected to the inside of the support arm 21, providing additional support for the longitudinal support 6. When the transverse moving seat 5 drives the longitudinal support 6 to move and the longitudinal moving seat 8 moves on the longitudinal support 6, the combination of the support arm 21 and the rotating shaft 22 can ensure the smooth movement of the longitudinal support 6 and reduce the shaking and deviation during the movement.

[0035] The inner wall of the supporting wall 2 is equipped with equally spaced lighting lamps 24. During the test, the lighting lamps 24 can provide sufficient and uniform light to the test area, ensuring that the high-definition camera 23 can clearly capture the detailed changes of the connection nodes.

[0036] Example 2: A mechanical performance testing device for steel truss connection nodes, referring to... Figure 3 , Figure 4 and Figure 5 The tension sensor 10 is electrically connected to the external control platform. A high-definition camera 23 is fixedly connected to the outer surface of the longitudinal moving seat 8 via a mounting plate. The high-definition camera 23 and the tension sensor 10 are electrically connected to the external control platform. This allows for real-time and accurate transmission of the tensile force data borne by the connection node during the test to the control platform. This facilitates real-time monitoring and analysis of tensile force changes by operators, enabling them to promptly grasp the mechanical performance status of the connection node. The high-definition camera 23 can also record the deformation, damage, and other appearance changes of the connection node during the test in real time and transmit the image information to the external control platform. By combining the tensile force data and image information, operators can gain a more comprehensive and intuitive understanding of the mechanical performance of the connection node under different stress states, providing richer evidence for the quality assessment, fault diagnosis, and improved design of steel truss connection nodes.

[0037] A positioning seat 15 is fixedly connected to the upper surface of the base 1. A base plate 16 and a second hydraulic cylinder 17 are fixedly connected to the side of the positioning seat 15 near the supporting wall 2. The second hydraulic cylinder 17 is located above the base plate 16. A positioning plate 18 is fixedly connected to the output end of the second hydraulic cylinder 17. A positioning rod 19 is fixedly connected to the bottom surface of the positioning plate 18 at equal intervals. The base plate 16 has through holes corresponding to the positioning rods 19. When placing the specimen, the second hydraulic cylinder 17 retracts and the positioning plate 18 is raised to facilitate the placement of the specimen on the base plate 16. After the specimen is placed, the second hydraulic cylinder 17 extends and pushes the positioning plate 18 downward. The positioning rods 19 pass through the through holes on the specimen and the base plate 16 to firmly fix the specimen in the designated position, ensuring that the specimen will not move or shift during the test, thus ensuring the accuracy and stability of the test.

[0038] Two sliders 25 are fixedly connected to the outer surface of the positioning plate 18. Each slider 25 is fixedly connected to a limiting plate 26 on the side away from the positioning plate 18. The sliders 25 are slidably connected to the positioning seat 15 through a groove opened inside the positioning seat 15. The outer surface of the limiting plate 26 is slidably connected to the inner wall of the positioning seat 15. When the second hydraulic cylinder 17 pushes the positioning plate 18 to move up and down, the sliders 25 slide in the groove of the positioning seat 15, providing guidance for the movement of the positioning plate 18 and preventing the positioning plate 18 from shifting or shaking during the movement. The limiting plate 26 restricts and reinforces the positioning plate 18, avoiding misalignment and shifting of the positioning plate 18 during the test and improving the stability of the positioning plate 18 during the test operation.

[0039] It should be noted that a positioning hole corresponding to the positioning rod 19 needs to be opened at one end of the specimen connection node. The second hydraulic cylinder 17 is activated to drive the positioning plate 18 and the positioning rod 19 to move down. The positioning plate 18 presses the specimen onto the base plate 16. At the same time, the positioning rod 19 passes through the positioning hole on the specimen and the through hole on the base plate 16 to complete the positioning of the specimen. Meanwhile, a connection hole needs to be opened at the other end of the specimen connection node, and a steel cable is used to pass one end of the steel cable through the connection hole and fix it to the specimen. The other end of the steel cable is fixed to the fixing ring 11 to carry out subsequent testing operations.

[0040] The implementation principle of this application embodiment is as follows: During testing, the drive motor 12 on the transverse moving seat 5 can be started. The drive motor 12 drives the drive gear 13 to rotate. The drive gear 13 meshes with the internal gear ring 14 fixedly connected to the inner wall of the transverse support 3, causing the transverse moving seat 5 to move in a ring along the transverse fixed rod 4. The transverse moving seat 5 drives the longitudinal support 6 to move in a ring along the transverse fixed rod 4, thereby adjusting the driving position of the first hydraulic cylinder 9 laterally, that is, adjusting the force direction of the connection point to be tested laterally. The drive motor 12 on the longitudinal moving seat 8 can be started. The drive motor 12 drives the drive gear 13 to rotate. The drive gear 13 meshes with the internal gear ring 14 fixedly connected to the inner wall of the longitudinal support 6, causing the longitudinal moving seat 8 to move in a ring along the longitudinal fixed rod 7. The longitudinal moving seat 8 drives the first hydraulic cylinder 9 to move in a ring along the longitudinal fixed rod 7, thereby adjusting the driving position of the first hydraulic cylinder 9. The position is adjusted longitudinally, that is, the force direction of the connection point to be tested is adjusted longitudinally. Combined with the position adjustment of the transverse moving seat 5 and the longitudinal moving seat 8, the force direction of the connection point to be tested can be adjusted at multiple angles. During the test, the first hydraulic cylinder 9 is activated to drive the tension sensor 10 and the fixing ring 11 to move. The steel cable generates tension on the specimen connection node fixed on the positioning seat 15. The tension sensor 10 can transmit the tension data borne by the connection node during the test to the control platform in real time and accurately, so that the operator can monitor and analyze the tension changes in real time and grasp the mechanical performance status of the connection node in a timely manner. The high-definition camera 23 can record the deformation, damage and other appearance changes of the connection node in real time during the test and transmit the image information to the external control platform. The operator can combine the tension data and image information to understand the mechanical performance of the connection node under different stress states more comprehensively and intuitively.

[0041] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mechanical performance testing device for steel truss connection nodes, comprising a base (1), characterized in that: A supporting wall (2) is fixedly connected to the upper surface of the base (1). A transverse bracket (3) is fixedly connected to the inner wall of the supporting wall (2). Two transverse fixing rods (4) are fixedly connected inside the transverse bracket (3). A first transverse moving seat (5) is slidably sleeved on the outer circumferential surface of the two transverse fixing rods (4). A longitudinal bracket (6) is fixedly connected to the side of the transverse moving seat (5) away from the transverse bracket (3). Two longitudinal fixing rods (7) are fixedly connected inside the longitudinal bracket (6). A longitudinal moving seat (8) is slidably sleeved on the outer circumferential surface of the two longitudinal fixing rods (7). A first hydraulic cylinder (9) is installed on the side away from the longitudinal support (6). A tension sensor (10) is fixedly connected to the output end of the first hydraulic cylinder (9). A fixing ring (11) is fixedly connected to the outer surface of the tension sensor (10). A drive motor (12) is installed on the side of the transverse moving seat (5) and the longitudinal moving seat (8) close to the supporting wall (2). A drive gear (13) is fixedly connected to the output end of each drive motor (12). An internal gear ring (14) is fixedly connected to the inner wall of the transverse support (3) and the longitudinal support (6). The drive gear (13) meshes with the internal gear ring (14) respectively.

2. The mechanical performance testing device for steel truss connection nodes according to claim 1, characterized in that: The supporting wall (2), the horizontal bracket (3), the horizontal fixing rod (4), the longitudinal bracket (6), and the longitudinal fixing rod (7) are all arranged in a semi-circular shape.

3. The mechanical performance testing device for steel truss connection nodes according to claim 1, characterized in that: The transverse support (3) and transverse fixing rod (4), and the longitudinal support (6) and longitudinal fixing rod (7) are all fixedly connected with reinforcing rods (20) arranged at equal intervals.

4. The mechanical performance testing device for steel truss connection nodes according to claim 1, characterized in that: The top and bottom of the inner wall of the supporting wall (2) are fixedly connected to the supporting arm (21), and the upper and bottom surfaces of the longitudinal bracket (6) are fixedly connected to the rotating shaft (22). The outer circumferential surface of the rotating shaft (22) is rotatably connected to the inside of the supporting arm (21).

5. The mechanical performance testing device for steel truss connection nodes according to claim 1, characterized in that: The tension sensor (10) is electrically connected to the external control platform. A high-definition camera (23) is fixedly connected to the outer surface of the longitudinal moving seat (8) through a mounting plate. The high-definition camera (23) is electrically connected to the external control platform.

6. The mechanical performance testing device for steel truss connection nodes according to claim 1, characterized in that: The inner wall of the supporting wall (2) is equipped with lighting lamps (24) arranged at equal intervals.

7. The mechanical performance testing device for steel truss connection nodes according to claim 1, characterized in that: A positioning seat (15) is fixedly connected to the upper surface of the base (1). A base plate (16) and a second hydraulic cylinder (17) are fixedly connected to the side of the positioning seat (15) near the supporting wall (2). The second hydraulic cylinder (17) is located above the base plate (16). A positioning plate (18) is fixedly connected to the output end of the second hydraulic cylinder (17). A positioning rod (19) is fixedly connected to the bottom surface of the positioning plate (18). A through hole corresponding to the positioning rod (19) is opened inside the base plate (16).

8. The mechanical performance testing device for steel truss connection nodes according to claim 7, characterized in that: Two sliders (25) are fixedly connected to the outer surface of the positioning plate (18). Each slider (25) is fixedly connected to a limiting plate (26) on the side away from the positioning plate (18). The slider (25) is slidably connected to the positioning seat (15) through a groove opened inside the positioning seat (15). The outer surface of the limiting plate (26) is slidably connected to the inner wall of the positioning seat (15).

Images