A sling force detection test device and method

Abstract

The application relates to a sling force detection test device and method, which comprises a six-degree-of-freedom hydraulic platform provided with a fixed end and a movable end, six telescopic members being hinged between the fixed end and the movable end; a fixing mechanism is arranged along the sling axial force direction; in use, one end of a short sling force detection device is connected with the movable end of the six-degree-of-freedom hydraulic platform, and the other end is connected with the fixing mechanism. Through the movement of the movable end of the six-degree-of-freedom hydraulic platform, the sling can be subjected to loads such as pulling force, bending moment and torsion, the movement of the sling in the actual application process is simulated, then the short sling force detection device is used to monitor the change of the sling force, and the test device is provided for the sling force detection, and the sling force can be accurately evaluated in the laboratory.

Description

Technical Field

[0001] The present application relates to the technical field of bridge cable force measurement, and in particular to a suspension cable force detection test device and method. Background Art

[0002] The sling is the main force-transmitting component connecting the main beam and main cable of a suspension bridge. The sling tension has a huge impact on the internal force and linear shape of the structure of a long-span suspension bridge. It is one of the key factors in the stress assessment of the entire bridge structure and an important basis for analyzing the current stress state of the structure and assessing the health status of the bridge structure. The detection of sling tension is of great significance to the assessment of the health status of the suspension bridge throughout its entire life cycle.

[0003] Due to the special mechanical properties of short slings, their detection problem presents significant technical challenges: on the one hand, short slings have greater bending stiffness due to their short length, and must simultaneously withstand multi-dimensional load coupling such as axial tension, bending moment, and torsional deformation during actual service; on the other hand, traditional cable tension detection methods have significant limitations - existing test equipment (such as unidirectional tensile testing machines) can only apply a single axial tension, cannot reproduce the spatial mechanical behavior under complex working conditions, and cannot accurately evaluate the cable tension of short slings. Summary of the Invention

[0004] The embodiments of the present application provide a sling tension detection test device and method to solve the problem that the traditional sling tension detection method in the related art can only apply a single axial tension and cannot accurately evaluate the tension of a short sling.

[0005] In a first aspect, a sling force detection test device is provided, comprising:

[0006] A six-degree-of-freedom hydraulic platform, comprising a fixed end and a movable end, with six telescopic members hinged between the fixed end and the movable end;

[0007] A fixing mechanism is arranged along the axial force direction of the sling;

[0008] When in use, one end of the short sling force measuring device is connected to the movable end of the six-degree-of-freedom hydraulic platform, and the other end is connected to the fixing mechanism.

[0009] In some embodiments, the fixing mechanism includes a fixed base and a movable block movably connected to the base, and one end of the short sling force measuring device is hinged to the movable block.

[0010] In some embodiments, there are two groups of fixing mechanisms, a cavity for the sling to move is provided between the two groups of fixing mechanisms, a connecting block is fixedly connected between the movable blocks of the two groups of fixing mechanisms, and one end of the short sling force measuring device is hinged to the connecting block.

[0011] In some embodiments, the base is provided with a plurality of protrusions along the axial force direction of the sling, grooves are formed between adjacent protrusions, and the movable block is fixedly connected to the protrusions by a plurality of fasteners.

[0012] In some embodiments, the fixed end is provided with a cavity for the sling to move.

[0013] In a second aspect, a sling force detection test method is provided, comprising:

[0014] Install a short sling force measuring device;

[0015] Use a six-degree-of-freedom hydraulic platform to calibrate the short sling force measuring device;

[0016] A six-degree-of-freedom hydraulic platform is used to simulate the motion of the sling.

[0017] In some embodiments, the installation of the short sling force measuring device comprises the following steps:

[0018] Install one end of the short sling force measuring device on the movable end of the six-degree-of-freedom hydraulic platform;

[0019] Install the other end of the short sling force measuring device on the movable block;

[0020] Move the movable block to make the short sling force measuring device free, and fix the movable block on the base.

[0021] In some embodiments, the calibrating of the short sling force measuring device using a six-degree-of-freedom hydraulic platform comprises the following steps:

[0022] Adjust the telescopic part to move the movable end along the Z-axis direction, and apply a tension F1 in the Z-axis direction to the sling;

[0023] Record the force feedback data F2 of the short sling force measuring device;

[0024] Compare F1 with F2 to calibrate the short sling force measuring device.

[0025] In some embodiments, simulating the motion of the sling using a six-degree-of-freedom hydraulic platform includes:

[0026] The relative motion of the sling in the transverse direction, the longitudinal direction, and the coupled relative motion in the transverse and longitudinal directions are simulated.

[0027] In some embodiments, simulating the motion of the sling using a six-degree-of-freedom hydraulic platform comprises the following steps:

[0028] Adjust the telescopic parts to keep the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform constant, so that the movable end rotates around the hinge point between the sling and the fixed mechanism;

[0029] Adjust the telescopic parts to change the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform, so that the movable end rotates around the hinge point between the sling and the fixed mechanism.

[0030] The embodiment of the present application provides a sling force detection test device and method, in which a short sling force measuring device is installed on a six-degree-of-freedom hydraulic platform and a fixed mechanism, the movable end is moved along the Z axis, and a tension F1 in the Z axis direction is applied to the sling as a known force value. The force feedback data F2 of the short sling force measuring device is recorded, and F1 is compared with F2. The short sling force measuring device is calibrated to ensure that the measurement results of the short sling force measuring device are accurate and reliable and conform to the actual force conditions. Then, the telescopic part is adjusted so that the movable end rotates around the hinge point between the sling and the fixed mechanism to simulate the movement of the sling during actual application. This simulation can more realistically reflect the complex stress state of the sling in actual operation, thereby providing a reliable experimental method for sling force detection. Through this device and method, the reliability of the sling force detection test method can be accurately evaluated in a laboratory environment, providing strong support for actual engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 Schematic diagram of the structure of the sling force detection test device provided in the embodiment of the application Figure I ;

[0033] Figure 2 Schematic diagram of the structure of the sling force detection test device provided in the embodiment of the application Figure II ;

[0034] Figure 3 A side structural diagram of a sling force detection test device provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the planar structure of a sling force detection test device provided in an embodiment of the present application;

[0036] Figure 5 The sling motion state I provided in the embodiment of the present application;

[0037] Figure 6 This is the sling motion state II provided in the embodiment of the present application.

[0038] In the figure: 1. Six-degree-of-freedom hydraulic platform; 101. Fixed end; 102. Telescopic member; 103. Movable end; 2. Short sling force measuring device; 3. Fixing mechanism; 301. Base; 302. Movable block; 303. Protrusion; 304. Groove; 305. Fastener; 4. Cavity; 5. Connecting block; 6. Sling; 7. Pin. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] The embodiment of the present application provides a sling tension detection test device, which can solve the problem that the traditional sling tension detection method in the related art can only apply a single axial tension and cannot accurately evaluate the tension of a short sling.

[0041] First, as Figures 1 to 4 As shown, the present application provides a sling force detection test device, which includes:

[0042] The six-degree-of-freedom hydraulic platform 1 has a fixed end 101 and a movable end 103, with six telescopic members 102 hingedly connected between the fixed end 101 and the movable end 103. The telescopic members 102 are hingedly connected to the fixed end 101 and the movable end 103 at their respective ends. The telescopic members 102 are hydraulic cylinders, and the extension or contraction of the hydraulic cylinders drives the movable end 103 to move. The structure and operating principle of the six-degree-of-freedom hydraulic platform 1 are common knowledge and will not be described in detail here.

[0043] The fixing mechanism 3 is arranged along the axial force direction of the sling 6. One end of the short sling force measuring device 2 is connected to the fixing mechanism 3 via a pin 7, so that the six-degree-of-freedom hydraulic platform 1 can simulate the six motion states of the sling;

[0044] During use, one end of the short sling force measuring device 2 is connected to the movable end 103 of the six-degree-of-freedom hydraulic platform 1, and the other end is connected to the fixing mechanism 3. Specifically, the short sling force measuring device 2 includes a sling 6, a pin 7, and a fork lug, and is connected to the movable end 103 via the pin 7. It is used to detect changes in the cable force of the sling 6 in real time. The measurement principle and detailed structure of the short sling force measuring device 2 are disclosed in the patent application No. 202410975121.1 and are not further described in this application.

[0045] The short sling force measuring device is installed on the six-degree-of-freedom hydraulic platform 1 and the fixing mechanism 3. Through the movement of the movable end 103 of the six-degree-of-freedom hydraulic platform 1, tension, bending moment, torsion and other loads can be applied to the sling 6 to simulate the movement of the sling 6 in actual application. Then, the short sling force measuring device 2 is used to monitor the changes in the force of the sling 6, providing a test device for the detection of the force of the sling 6, so that the force of the sling 6 can be accurately evaluated in the laboratory.

[0046] In some embodiments, the fixing mechanism 3 includes a fixed base 301 and a movable block 302 movably connected to the base 301 , and one end of the short sling force measuring device 2 is connected to the movable block 302 via a pin shaft 7 .

[0047] Specifically, a base 301 is positioned along the sling's axial force direction. This base 301 is fixedly connected to the fixed end 101. A movable block 302 is mounted on the base 301. One end of the short-sling force measuring device 2 is hingedly connected to the movable block 302, allowing the device to adapt to testing requirements for slings of varying lengths. When a sling 6 of a different length needs to be replaced, the fork lugs at each end of the sling 6 are removed for easy replacement.

[0048] In some embodiments, there are two groups of fixing mechanisms 3, and a cavity 4 for the sling 6 to move is provided between the two groups of fixing mechanisms 3. A connecting block 5 is fixedly connected between the movable blocks 302 of the two groups of fixing mechanisms 3, and one end of the sling 6 is hinged to the connecting block 5.

[0049] In some embodiments, the fixed end 101 is provided with a cavity 4 for the sling 6 to move.

[0050] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the fixed end 101 is in a concave shape with a groove provided on the top to allow the sling 6 to move along the X-axis, Y-axis, or XY-axis. In some alternative embodiments, the fixed end 101 may be in a square shape with a through slot provided in the middle to allow the sling 6 to move along the X-axis, Y-axis, or XY-axis. Compared to the square-shaped fixed end 101, the concave fixed end 101 has a larger range of movement.

[0051] Furthermore, two sets of fixing mechanisms 3 are provided on one side of the fixed end 101, and a cavity 4 for the movement of the sling 6 is formed between the two sets of fixing mechanisms 3, so that the sling 6 can move. A connecting block 5 is fixedly connected between the movable blocks of the two sets of fixing mechanisms 3, and one end of the sling is hinged to the connecting block 5.

[0052] In some embodiments, the base 301 is provided with a plurality of protrusions 303 along the axial force direction of the sling 6 . The protrusions 303 are integrally provided with the base 301 , and grooves 304 are formed between adjacent protrusions 303 . The movable block 302 is fixedly connected to the protrusions 303 by a plurality of fasteners 305 .

[0053] Specifically, the movable block 302 is provided with a fixing groove matching the protrusion 303, so that the movable block 302 can be clamped on the protrusion 303 and connected by a fastener 305. The fastener 305 can be a bolt or a screw, and threaded holes are provided at corresponding positions on the movable block 302 and the protrusion 303.

[0054] In this application, if Figure 1 As shown, the lower end surface of the movable block 302 is provided with a fixing groove that matches the size of the two protrusions 303, so that the movable block 302 can be stuck on the protrusions 303, and a row of threaded holes is provided on each protrusion 303. The line formed by the multiple threaded holes is perpendicular to the axial force direction of the sling 6. The movable block 302 is fixed to the protrusion by screws, which is easy to disassemble and adapt to slings 6 of different lengths.

[0055] In a second aspect, a sling force detection test method is provided, including a sling force detection test device, and the specific method includes:

[0056] 101: Install the short sling force measuring device 2.

[0057] Specifically, one end of the short sling force measuring device 2 is mounted on the movable end 103 of the six-degree-of-freedom hydraulic platform 1;

[0058] Install the other end of the short sling force measuring device 2 on the movable block 302;

[0059] The movable block 302 is moved to put the short sling force measuring device 2 in a free state, and the movable block 302 is fixed on the base 301 .

[0060] 102: Use the six-degree-of-freedom hydraulic platform 1 to calibrate the short sling force measuring device 2.

[0061] Specifically, the telescopic member 102 is adjusted to extend the output ends of the six hydraulic cylinders synchronously, driving the movable end 103 to move along the Z-axis direction, that is, the axial force direction of the sling 6, and applying a tension F1 in the Z-axis direction to the sling 6;

[0062] Record the force feedback data F2 of the short sling force measuring device 2;

[0063] Compare F1 with F2 and calibrate the short sling force measuring device 2.

[0064] Among them, the value of F1 is a known force value. The value of F1 can be accurately controlled by the six-degree-of-freedom hydraulic platform 1. After being subjected to the tension F1, the short sling force measuring device 2 will output a force feedback data F2. F2 is the measurement result of the actual force by the short sling force measuring device 2.

[0065] Compare the F2 output of the short sling force measuring device 2 with the known F1:

[0066] If F2=F1, it means that the measurement result of the short sling force measuring device 2 is accurate and no adjustment is required;

[0067] If F2 ≠ F1, this indicates an error in the short-sling force measuring device 2 (possibly due to sensitivity deviation, nonlinearity, etc.). Adjust the short-sling force measuring device 2's internal parameters (such as amplification factor, calibration coefficient, etc.) or algorithm to bring F2 as close to F1 as possible. Calibration ensures that the short-sling force measuring device 2's measurement results remain accurate and reliable under different conditions, thereby improving the measurement accuracy and reliability of the entire test setup.

[0068] 103: Use the six-degree-of-freedom hydraulic platform 1 to simulate the movement of the sling 6;

[0069] Specifically, it includes: simulating the relative motion of the suspension cable 6 in the transverse direction of the bridge, the relative motion in the longitudinal direction of the bridge, and the relative motion coupled in the transverse direction and the longitudinal direction of the bridge.

[0070] 201: When simulating the transverse relative movement of the sling 6, adjust the telescopic member 102 to keep the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform unchanged, so that the movable end 103 rotates along the Y-axis direction around the hinge point between the sling 6 and the fixing mechanism 3.

[0071] like Figure 5 As shown, assuming that the hinge point between the sling 6 and the fixing mechanism 3 is point A, and the hinge point between the sling 6 and the movable end 103 is point B, adjust the telescopic member 102 to keep the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform unchanged, so that the B end of the sling 6 rotates around the A end to point B', that is, rotates along the Y-axis direction, simulating the horizontal (vertical) bridge movement of the sling 6, record the force feedback data F2 of the short sling force measuring device 2, and observe whether the value of F2 changes.

[0072] 202: When simulating the longitudinal relative motion of the sling 6, adjust the telescopic member 102 to keep the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform unchanged, so that the movable end 103 rotates along the X-axis direction around the hinge point between the sling 6 and the fixing mechanism 3.

[0073] like Figure 6 As shown, assuming that the hinge point between the sling 6 and the fixing mechanism 3 is point A, and the hinge point between the sling 6 and the movable end 103 is point B, adjust the telescopic member 102 to keep the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform unchanged, so that the B end of the sling 6 rotates around the A end to point B', that is, rotates along the X-axis direction, simulating the longitudinal (transverse) bridge movement of the sling 6, record the force feedback data F2 of the short sling force measuring device 2, and observe whether the value of F2 changes.

[0074] 203: When simulating the relative motion of the sling 6 in the transverse and longitudinal directions, adjust the telescopic member 102 to keep the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform unchanged, so that the movable end 103 performs a compound rotational motion along the XY plane around the hinge point between the sling 6 and the fixed mechanism 3.

[0075] When a short sling is installed on a bridge, there are two reasons for changes in cable force during use: one is the actual cable force change, and the other is changes in the cable force value caused by external factors causing the cable to move. Under normal circumstances, the cable force does not change when the short sling moves. Using the above-mentioned cable force detection test device and method, by observing the value F1 of the six-degree-of-freedom hydraulic platform and the force feedback data F2 of the short sling force measuring device 2, the influence of cable movement on the cable force can be verified and eliminated. The actual change in the value of the short sling force measuring device 2 is the actual change in the cable force.

[0076] Under normal circumstances, the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform is kept constant. When the six-degree-of-freedom hydraulic platform simulates the movement of the sling, the force feedback data F2 of the short sling force measuring device 2 should also remain unchanged. When a traditional short sling force measuring device 2 simulates the movement of the sling and maintains the tension constant, the force feedback data may change, resulting in errors in actual application. The sling force detection test device and method of this application can verify the accuracy of the short sling force measuring device 2.

[0077] In order to better verify the reliability of the short sling force detection test device, multiple tests can be performed. Change the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform, rotate the movable end 103 along the X-axis, Y-axis, and XY-axis directions around the hinge point between the sling 6 and the fixed mechanism 3, and observe the changes in the values ​​of F1 and F2. When the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform changes, the force feedback data F2 of the short sling force measuring device 2 should also change, and the change value should be correspondingly equal. By combining the two methods, the reliability of the short sling force detection test device can be better verified.

[0078] In the above-described test device and method, by adjusting the telescopic member 102 to rotate the end B of the sling 6 about the end A, the movement of the sling 6 is simulated. This can more realistically simulate the motion of the sling 6 and provide a test method for detecting the force of the sling 6. This method can not only test the force of the sling 6 but also simulate the complex force conditions of the sling 6 during actual operation, providing a research method for the application of slings.

[0079] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0080] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0081] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A sling force detection test method, characterized in that: The invention comprises a sling force detection test device, the device comprising: A six-degree-of-freedom hydraulic platform (1) is provided with a fixed end (101) and a movable end (103), wherein six telescopic members (102) are hingedly connected between the fixed end (101) and the movable end (103); A fixing mechanism (3) is arranged along the axial force direction of the sling (6); When in use, one end of the short sling force measuring device (2) is connected to the movable end (103) of the six-degree-of-freedom hydraulic platform (1), and the other end is connected to the fixing mechanism (3); The fixed end (101) is provided with a cavity (4) for the sling (6) to move; The test method includes: Install the short sling force measuring device (2); Using a six-degree-of-freedom hydraulic platform (1) to calibrate a short sling force measuring device (2); The calibrating of the short sling force measuring device (2) using the six-degree-of-freedom hydraulic platform (1) comprises the following steps: Adjust the telescopic member (102) so that the movable end (103) moves along the Z-axis direction, thereby applying a tension F1 in the Z-axis direction to the sling (6); Recording the force feedback data F2 of the short sling force measuring device (2); Compare F1 with F2 and calibrate the short sling force measuring device (2); The motion of the sling (6) is simulated using a six-degree-of-freedom hydraulic platform (1); The method of simulating the motion of the sling (6) using the six-degree-of-freedom hydraulic platform (1) includes: The relative motion of the sling (6) in the transverse direction, the relative motion in the longitudinal direction, and the relative motion coupled in the transverse and longitudinal directions are simulated.

2. The sling force detection test method according to claim 1, wherein: The fixing mechanism (3) comprises a fixed base (301) and a movable block (302) movably connected to the base (301), and one end of the short sling force measuring device (2) is hinged to the movable block (302).

3. The sling force detection test method according to claim 2, wherein: The fixing mechanism (3) is provided with two groups, a cavity (4) for the sling (6) to move is provided between the two groups of the fixing mechanism (3), a connecting block (5) is fixedly connected between the movable blocks (302) of the two groups of the fixing mechanism (3), and one end of the short sling force measuring device (2) is hinged to the connecting block (5).

4. The sling force detection test method according to claim 2, wherein: The base (301) is provided with a plurality of protrusions (303) along the axial force direction of the sling (6), and grooves (304) are formed between adjacent protrusions (303). The movable block (302) is fixedly connected to the protrusions (303) via a plurality of fasteners (305).

5. The sling force detection test method according to claim 1, wherein: The installation of the short sling force measuring device (2) comprises the following steps: Mounting one end of the short sling force measuring device (2) on the movable end (103) of the six-degree-of-freedom hydraulic platform (1); The other end of the short sling force measuring device (2) is mounted on the movable block (302); The movable block (302) is moved to place the short sling force measuring device (2) in a free state, and the movable block (302) is fixed on the base (301).

6. The sling force detection test method according to claim 1, wherein: The method of simulating the movement of the sling (6) using the six-degree-of-freedom hydraulic platform (1) comprises the following steps: Adjust the telescopic member (102) to keep the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform (1) constant, so that the movable end (103) rotates around the hinge point between the sling (6) and the fixed mechanism (3); The telescopic member (102) is adjusted to change the tension F1 in the Z-axis direction of the six-degree-of-freedom hydraulic platform (1), so that the movable end (103) rotates around the hinge point between the sling (6) and the fixing mechanism (3).

Images