Mechanical properties test device and method for overhead transmission line suspension wire clamp hardware

Abstract

The embodiment of the present application provides a mechanical property test device and method for suspension wire clamp hardware of overhead transmission line, which relates to the field of power transmission equipment measurement, wherein the suspension angles on both sides of the suspension hardware string are adjusted to preset angles through a height adjustment unit and an angle adjustment unit, and force is applied to the first loading cable and the second loading cable respectively through a first servo loading unit and a second servo loading unit, wherein the preset angles include α°, α+10° and α+20°, and the deformation of the suspension hardware string is measured, and load data and inclination data of the first acquisition unit, the second acquisition unit and the third acquisition unit are obtained. The suspension hardware string is mechanically analyzed according to the deformation, load data and inclination data, and the stress conditions of the suspension hardware string under various design working conditions and extreme conditions are accurately simulated, which can provide a basis for quality inspection and material selection of the suspension wire clamp, reduce the situation of suspension hardware breakage, improve the service reliability of the overhead power transmission equipment, and ensure the intrinsic safety of the power transmission equipment.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission equipment measurement, and in particular to a mechanical performance test device and method for overhead power transmission line suspension wire clamp hardware. Background Art

[0002] Suspension wire clamps are widely used in overhead power transmission equipment. They can suspend ground wires and transfer loads such as ice and wind on overhead lines to pole towers through suspension hardware strings. Therefore, analyzing the mechanical properties of suspension wire clamps can ensure that they remain stable in harsh environments.

[0003] In the current existing technology, the mechanical performance analysis of suspension fittings only examines the performance of a single suspension wire clamp under vertical uniform loading. However, in actual working conditions, the suspension wire clamp has different spans and height differences on both sides, different suspension angles on both sides, and extreme icing causes the actual suspension angle to exceed the design, or unbalanced tension is generated after being subjected to external loads of icing, causing the entire hardware string to deflect, resulting in uneven force on the suspension wire clamp and local pressure at the wire clamp outlet. When such a situation occurs, the suspension hardware will break, causing the line to drop and stop operating, affecting the reliability of power supply. Therefore, there is an urgent need for a suspension hardware mechanical analysis device and method that can simulate actual on-site working conditions. Summary of the invention

[0004] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art and to provide a device and method for testing the mechanical properties of overhead transmission line suspension wire clamp hardware.

[0005] The present invention provides the following technical solutions:

[0006] In the first aspect, an embodiment of the present disclosure provides a mechanical properties test device for suspension line clamp hardware of an overhead transmission line, comprising a suspension hardware string, a first ground wire, a second ground wire, a first collection unit, a second collection unit, a third collection unit, a first loading cable, a second loading cable, a first servo loading unit, a second servo loading unit, an angle adjustment unit and a height adjustment unit, one side of the suspension hardware string is mechanically connected to the first ground wire, the other side of the suspension hardware string is mechanically connected to the second ground wire, the first ground wire is connected to the first collection unit through a steel anchor, the second ground wire is connected to the second collection unit through a steel anchor, the first collection unit is connected to the first loading cable steel anchor, the second collection unit is connected to the second loading cable steel anchor, the first loading cable is ball-jointed to the first servo loading unit, the second loading cable is ball-jointed to the second servo loading unit, the angle adjustment unit is pressed on the first loading cable and the second loading cable, the upper part of the suspension hardware string is connected to the third collection unit through a steel anchor, and the third collection unit is pin-connected to the height adjustment unit.

[0007] In a second aspect, a method for testing mechanical properties of suspension wire clamp hardware for overhead transmission line is provided in an embodiment of the present disclosure, which is applied to the mechanical properties testing device for suspension wire clamp hardware for overhead transmission line as described in the first aspect, wherein the suspension angles on both sides of the suspension hardware string are adjusted to a preset angle by the height adjustment unit and the angle adjustment unit, and the first loading cable and the second loading cable are force loaded respectively by the first servo loading unit and the second servo loading unit, wherein the preset angle includes α°, α+10° or α+20°;

[0008] Measuring the deformation of the suspended hardware string, and acquiring the load data and the inclination data of the first acquisition unit, the second acquisition unit, and the third acquisition unit;

[0009] A mechanical analysis is performed on the suspension hardware string according to the deformation, the load data and the inclination angle data.

[0010] According to a specific embodiment disclosed in the present application, the first acquisition unit, the second acquisition unit and the third acquisition unit all include a load sensor and an inclination sensor, the angle adjustment unit includes a first angle adjustment module and a second angle adjustment module, the first angle adjustment module and the second angle adjustment module both include a pulley block and an adjustment hole plate, the pulley of the pulley block is pressed on the loading cable, the pulley block is bolted to any adjustment hole of the adjustment hole plate, the hanging angles on both sides of the hanging hardware string are adjusted to a preset angle by the height adjustment unit and the angle adjustment unit, and the steps of respectively applying force to the first loading cable and the second loading cable by the first servo loading unit and the second servo loading unit include:

[0011] When the overhang angles on both sides of the overhanging hardware string are both α°, the servo loading unit performs force loading step by step in a manner of 10%RTS as a level. After loading to 80%RTS, the force is loaded step by step in a manner of 5%RTS as a level to 95%RTS, and the 95%RTS load is maintained for 60S.

[0012] According to a specific embodiment disclosed in the present application, the step of adjusting the hanging angles on both sides of the hanging hardware string to a preset angle by the height adjustment unit and the angle adjustment unit, and respectively performing force loading on the first loading cable and the second loading cable by the first servo loading unit and the second servo loading unit includes:

[0013] When the overhang angles on both sides of the suspension hardware string are α+10° or α+20°, the servo loading unit performs force loading step by step with 10% RTS as one level, and loads it to the third collection unit to reach the nominal load of the suspension hardware string, and maintains the nominal load for 60S.

[0014] According to a specific embodiment disclosed in the present application, the height adjustment unit and the angle adjustment unit are used to adjust the hanging angles on both sides of the hanging hardware string to a preset angle, and the first servo loading unit and the second servo loading unit are used to load the first loading cable and the second loading cable respectively, wherein the steps include:

[0015] When the overhang angle on one side of the suspension hardware string is α° and the overhang angle on the other side of the suspension hardware string is α+10° or α+20°, the servo loading unit on the side of the suspension hardware string with a overhang angle of α+10° or α+20° is force loaded step by step with 10% RTS as one level, and the collection unit loaded on this side reaches the nominal load of the suspension hardware string, and the nominal load is maintained for 60S.

[0016] According to a specific embodiment disclosed in the present application, the step of adjusting the hanging angles on both sides of the hanging hardware string to a preset angle by the height adjustment unit and the angle adjustment unit, and respectively performing force loading on the first loading cable and the second loading cable by the first servo loading unit and the second servo loading unit includes:

[0017] When the suspension angles on both sides of the suspension hardware string are α°, the loading cable tension load of the servo loading unit on one side is 60% of the ground wire RTS, and the horizontal tension difference of the servo loading unit on the other side is 20% of the ground wire RTS, and the load is maintained for 60S.

[0018] According to a specific embodiment disclosed in the present application, the critical condition of the horizontal tension difference is:

[0019] , where T1 and T2 are the load values ​​of the load sensor connected to the ground wire at both ends, T1 is the load value controlled to be 60%±1% of the ground wire RTS, and β1 and β2 are the values ​​of the inclination sensor.

[0020] According to a specific implementation manner disclosed in the present application, the strength of the first loading cable and the second loading cable is selected to be more than 1.5 times that of the first ground wire and the second ground wire.

[0021] The above-mentioned overhead transmission line suspension wire clamp hardware mechanical properties testing device provided by the present application adjusts the suspension angles on both sides of the suspension hardware string to a preset angle through the height adjustment unit and the angle adjustment unit, and applies force to the first loading cable and the second loading cable respectively through the first servo loading unit and the second servo loading unit, wherein the preset angle includes α°, α+10° or α+20°, measures the deformation of the suspension hardware string, obtains the load data and inclination data of the first acquisition unit, the second acquisition unit and the third acquisition unit, and performs a mechanical analysis on the suspension hardware string according to the deformation, the load data and the inclination data, accurately simulates the stress conditions of the suspension hardware string under extreme conditions, can provide a basis for the quality inspection and material selection of the suspension wire clamp, reduces the breakage of the suspension hardware, improves the working efficiency of the overhead transmission equipment, and reduces the waste of manpower and material resources.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In each of the drawings, similar components are numbered similarly.

[0024] Figure 1 A schematic diagram of a flow chart of a mechanical properties test method for a suspension wire clamp fitting for an overhead transmission line provided in an embodiment of the present application is shown;

[0025] Figure 2 A structural schematic diagram of a mechanical properties testing device for suspension wire clamps of overhead transmission lines provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] At present, the mechanical load test of suspension fittings only examines the performance of the suspension wire clamp fitting body under vertical uniform loading. In actual working conditions, the suspension wire clamp fitting, as one of the components of the fitting string, participates in bearing the load and faces problems such as different spacing and height difference on both sides, unequal suspension angles on both sides, extreme icing causing the actual suspension angle to exceed the design, or unbalanced tension caused by external icing loads causing the suspension wire clamp fitting string to deflect, resulting in uneven force on the wire clamp and breakage.

[0032] See also Figure 1 , Figure 1 A schematic diagram of a flow chart of a mechanical performance test method for a suspension wire clamp for an overhead transmission line provided in an embodiment of the present application. Figure 2 , Figure 2A schematic structural diagram of a mechanical properties testing device for suspension wire clamps of overhead transmission lines provided in an embodiment of the present application.

[0033] The embodiment of the present application provides a mechanical property test device for suspension wire clamp hardware of an overhead transmission line, comprising a suspension hardware string, a first ground wire, a second ground wire, a first collection unit, a second collection unit, a third collection unit, a first loading cable, a second loading cable, a first servo loading unit, a second servo loading unit, an angle adjustment unit and a height adjustment unit, one side of the suspension hardware string is mechanically connected to the first ground wire, the other side of the suspension hardware string is mechanically connected to the second ground wire, the first ground wire is connected to the first collection unit through a steel anchor, the second ground wire is connected to the second collection unit through a steel anchor, the first collection unit is connected to the first loading cable steel anchor, the second collection unit is connected to the second loading cable steel anchor, the first loading cable is ball-jointed to the first servo loading unit, the second loading cable is ball-jointed to the second servo loading unit, the angle adjustment unit is pressed on the first loading cable and the second loading cable, the upper part of the suspension hardware string is connected to the third collection unit through a steel anchor, and the third collection unit is pin-connected to the height adjustment unit.

[0034] A method for testing mechanical properties of overhead transmission line suspension clamp hardware provided in an embodiment of the present application is applied to a mechanical properties testing device for overhead transmission line suspension clamp hardware, the device comprising a suspension hardware string, a first ground wire, a second ground wire, a first collection unit, a second collection unit, a third collection unit, a first loading cable, a second loading cable, a first servo loading unit, a second servo loading unit, an angle adjustment unit and a height adjustment unit, one side of the suspension hardware string is mechanically connected to the first ground wire, the other side of the suspension hardware string is mechanically connected to the second ground wire, the first ground wire is connected to the first collection unit through a steel anchor, the second ground wire is connected to the second collection unit through a steel anchor, the first collection unit is connected to the first loading cable steel anchor, the second collection unit is connected to the second loading cable steel anchor, the first loading cable is connected to the first servo loading unit by a ball hinge, the second loading cable is connected to the second servo loading unit by a ball hinge, the angle adjustment unit is pressed on both the first loading cable and the second loading cable, the upper part of the suspension hardware string is connected to the third collection unit by a steel anchor, and the third collection unit is pin-connected to the height adjustment unit. The first acquisition unit, the second acquisition unit and the third acquisition unit all include load sensors and inclination sensors, the angle adjustment unit includes a first angle adjustment module and a second angle adjustment module, the first angle adjustment module and the second angle adjustment module all include a pulley block and an adjustment hole plate, the pulley of the pulley block is pressed on the loading cable, and the pulley block is bolted to any adjustment hole of the adjustment hole plate.

[0035] Specifically, the suspension hardware string includes two suspension wire clamps and corresponding connecting hardware, and the upper part of the suspension hardware string is pinned to the third collection unit tooling through an ear shaft hanging plate. The third collection unit is pinned to the height adjustment unit, and the height adjustment unit is bolted to the reaction frame with an adjustable height. The third collection unit is used to collect the tensile load and string deflection of the suspension string. By adjusting the height adjustment unit and the angle adjustment unit, the vertical height and horizontal distance from the center of the suspension hardware string to the first loading cable and the second loading cable and the intersection center of the angle adjustment units on both sides are changed, so that the suspension angles on both sides reach the preset angles. At this time, due to the limited adjustment of the actual tooling, the horizontal distance cannot accurately reach the target value, resulting in an error in the suspension angle. The measured angle is collected by the first collection unit and the second collection unit, and the height adjustment unit and the angle adjustment unit are adjusted until the error between the angle of the suspension angle on both sides and the preset angle is less than 2°.

[0036] Step S101, adjusting the hanging angles on both sides of the hanging hardware string to preset angles through the height adjustment unit and the angle adjustment unit, and respectively performing force loading on the first loading cable and the second loading cable through the first servo loading unit and the second servo loading unit, wherein the preset angle includes α°, α+10° or α+20°.

[0037] The step of adjusting the hanging angles on both sides of the hanging hardware string to a preset angle by the height adjustment unit and the angle adjustment unit, and respectively performing force loading on the first loading cable and the second loading cable by the first servo loading unit and the second servo loading unit comprises:

[0038] When the overhang angles on both sides of the overhanging hardware string are both α°, the servo loading unit performs force loading step by step in a manner of 10%RTS as a level. After loading to 80%RTS, the force is loaded step by step in a manner of 5%RTS as a level to 95%RTS, and the 95%RTS load is maintained for 60S.

[0039] Preferably, the overhang angle is 25°, and the vertical height H and horizontal distance H from the center of the overhanging hardware string to the intersection center of the first loading cable and the second loading cable and the pulleys on both sides are adjusted by the connection position of the pulleys of the height adjustment unit and the angle adjustment unit and the adjustment hole plate. , , so that the overhang angles on both sides , All reach 25°. Calculate the overhang angles on both sides of the overhanging hardware string.

[0040] The step of adjusting the hanging angles on both sides of the hanging hardware string to a preset angle by the height adjustment unit and the angle adjustment unit, and respectively performing force loading on the first loading cable and the second loading cable by the first servo loading unit and the second servo loading unit comprises:

[0041] When the overhang angles on both sides of the suspension hardware string are α+10° or α+20°, the servo loading unit performs force loading step by step with 10% RTS as one level, and loads it to the third collection unit to reach the nominal load of the suspension hardware string, and maintains the nominal load for 60S.

[0042] The vertical height H and horizontal distance from the center of the suspended hardware string to the intersection center of the first loading cable and the second loading cable and the pulleys on both sides are adjusted by the connection position of the pulleys of the height adjustment unit and the angle adjustment unit and the adjustment hole plate. , , so that the overhang angles on both sides , Both reach α+10° and α+20°. When the third acquisition unit reaches the nominal load of the suspension fitting string, the mechanical properties of the suspension fitting string under extreme icing beyond design conditions can be verified.

[0043] The height adjustment unit and the angle adjustment unit are used to adjust the hanging angles on both sides of the hanging hardware string to a preset angle, and the first servo loading unit and the second servo loading unit are used to load the first loading cable and the second loading cable respectively, wherein the steps include:

[0044] When the overhang angle on one side of the suspension hardware string is α° and the overhang angle on the other side of the suspension hardware string is α+10° or α+20°, the servo loading unit on the side of the suspension hardware string with a overhang angle of α+10° or α+20° is force loaded step by step with 10% RTS as one level, and the collection unit loaded on this side reaches the nominal load of the suspension hardware string, and the nominal load is maintained for 60S.

[0045] Specifically, by adjusting the suspension angles on both sides of the suspension hardware string to different angles with a large difference, the mechanical properties of the suspension hardware string under extreme icing conditions with large pitch and large height difference on both sides can be verified.

[0046] The step of adjusting the hanging angles on both sides of the hanging hardware string to a preset angle by the height adjustment unit and the angle adjustment unit, and respectively performing force loading on the first loading cable and the second loading cable by the first servo loading unit and the second servo loading unit comprises:

[0047] When the suspension angles on both sides of the suspension hardware string are α°, the loading cable tension load of the servo loading unit on one side is 60% of the ground wire RTS, and the horizontal tension difference of the servo loading unit on the other side is 20% of the ground wire RTS, and the load is maintained for 60S.

[0048] The critical condition of the horizontal tension difference is:

[0049] , where T1 and T2 are the load values ​​of the load sensor connected to the ground wire at both ends, T1 is the load value controlled to be 60%±1% of the ground wire RTS, and β1 and β2 are the values ​​of the inclination sensor.

[0050] The strength of the first loading cable and the second loading cable is selected to be more than 1.5 times that of the first ground wire and the second ground wire.

[0051] Specifically, when the strength of the first loading cable and the second loading cable is selected to be 1.5 times or more than that of the first grounding wire and the second grounding wire, premature failure due to loading tension and concentrated load on the pulley can be prevented.

[0052] Step S102 , measuring the deformation of the suspension hardware string, and acquiring load data and inclination data of the first acquisition unit, the second acquisition unit, and the third acquisition unit.

[0053] Step S103: performing mechanical analysis on the suspension hardware string according to the deformation, the load data and the inclination angle data.

[0054] Specifically, in the prior art, a suspension fitting monomer is used for vertical load test, and a suspension wire clamp monomer in a 210KN suspension fitting string is selected to carry out vertical load test. Referring to Table 1, the selected suspension wire clamp monomers can meet the standard conditions in conventional tests, that is, the nominal load of 120KN loaded to a single suspension wire clamp monomer does not deform and maintain the load for 60s without damage.

[0055] Table 1 Load test results of suspension fittings

[0056]

[0057] Preferably, a 210KN suspension hardware string is selected for load test, the nominal load of the hardware string is 210KN, the suspension angles on both sides of the suspension hardware string are adjusted to 25°, and the servo loading unit is used to load the force step by step in a manner of 10%RTS as a level, and after loading to 80%RTS, the force is loaded step by step in a manner of 5%RTS as a level to 95%RTS, and the 95%RTS load is maintained for 60S. The results are shown in Table 2. It can be seen that the actual bearing capacity of the suspension hardware string made of cast aluminum shell material cannot meet the design nominal load requirements, while the suspension hardware string made of forged shell material can meet the requirements.

[0058] Table 2 Overhang angle test results

[0059]

[0060] Preferably, a 210KN suspension hardware string is selected for load test. The nominal load of the hardware string is 210KN. The suspension angles on both sides of the suspension hardware string are adjusted to α+10° or α+20°. The servo loading unit is used to load the force step by step with 10%RTS as one level. The load is loaded to the third acquisition unit to reach the nominal load of the suspension hardware string. The nominal load is maintained for 60S. The results are shown in Table 3. It can be seen that the failure mode of the aluminum alloy U-shaped clamp under the 45° suspension angle test is that the aluminum alloy clamp breaks, the shell breaks and flies out, and the string falls off. The failure mode of the wire clamp of the stainless steel U-shaped clamp under this extreme working condition is that the shell breaks, and the clamp can still wrap the ground wire without falling off, proving that the suspension wire clamp made of stainless steel U-shaped clamp has better performance under extreme working conditions.

[0061] Table 3 Test results of over-design overhang angle

[0062]

[0063] Preferably, when the overhang angle on one side of the suspension hardware string is 25° and the overhang angle on the other side of the suspension hardware string is 35° or 45°, the servo loading unit on the side of the suspension hardware string with an overhang angle of 35° or 45° is used to load the force step by step with 10% RTS as one level, and the collection unit loaded on this side reaches the nominal load of the suspension hardware string, and the nominal load is maintained for 60S. The results are shown in Table 4, and it can be seen that both the cast aluminum casing and the U-shaped stainless steel clamp have casing cracking on the right side.

[0064] Table 4 Unequal angle test results

[0065]

[0066] Preferably, a 210kN suspension hardware string is used, the nominal load of the hardware string is 210kN, and the ground wire RTS: 260.01kN is tested. When the suspension angles on both sides of the suspension hardware string are 25°, the loading cable tension load of the servo loading unit on one side is 60% of the ground wire RTS, and the horizontal tension difference of the servo loading unit on the other side is 20% of the ground wire RTS, and the load is maintained for 60S. The results are shown in Table 5, which shows that under this test condition, the suspension hardware string can meet the requirement of 20% unbalanced tension on both sides.

[0067] Table 5 String deflection test results

[0068]

[0069] Specifically, the final mechanical test result analysis includes the loading conditions recorded in each test, deformation, slippage or damage of the wire clamp. When the hanging angles on both sides of the hanging hardware string are adjusted to the preset angles, the first servo loading unit and the second servo loading unit are loaded to the specified hanging wire clamp nominal load, and the preset holding time is completed, if the wire clamp does not undergo plastic deformation or damage, it is determined that the wire clamp meets the design nominal load requirements.

[0070] It can be understood that the vertical test results of conventional single wire clamps in the prior art are shown in Table 1. The vertical load test cannot detect whether the suspension wire clamp can meet the design requirements under actual working conditions. In this embodiment, the suspension angles on both sides of the suspension hardware string are adjusted and the load is loaded by the servo loading unit to simulate the actual loading conditions of the suspension hardware string. It can be detected that the cast aluminum shell suspension wire clamp does not meet the design requirements.

[0071] Preferably, the test results in Table 3, by adjusting the hanging angles on both sides of the hanging hardware string to 45°, and loading the simulated extreme heavy icing conditions on both sides of the hanging wire clamp, verify that the failure mode of the aluminum alloy U-shaped clamp hanging wire clamp is very dangerous compared with the stainless steel U-shaped clamp hanging wire clamp in this extreme condition, and the line will be disconnected. The failure conditions faced in actual working conditions are simulated and reproduced, and the basis for selecting the materials of each component of the hanging wire clamp is provided.

[0072] Preferably, by adjusting the hanging angle of one side of the suspension hardware string to 25° and the other side to 35° or 45°, when the first servo loading unit and the second servo loading unit are loaded and the nominal load is maintained for 60S, the load, deformation, slippage or damage of the suspension wire clamp hardware is obtained, and the damage characteristics of the suspension wire clamp when it is covered with ice at the "large span and large height difference" position or extremely unevenly covered with ice on both sides are determined. As shown in the test results of Table 4, the suspension wire clamp jacket shell will crack under the simulated on-site "large span and large height difference" position icing or extremely unevenly covered with ice on both sides, but no serious events such as line drop will occur. This working condition simulation is consistent with the actual on-site failure situation, and can effectively simulate the on-site "large span and large height difference" position icing or extremely unevenly covered with ice on both sides, providing a test verification method for the design and selection of suspension hardware strings under extreme conditions.

[0073] Preferably, the hanging angles on both sides of the hanging hardware string are adjusted to 25° and the horizontal tension difference between the first servo loading unit and the second servo loading unit is 20%. When the first servo loading unit and the second servo loading unit are loaded and the preset load holding test is completed, if the wire clamp does not slip, plastically deform or break, the wire clamp meets the design 20% unbalanced tension requirement. As shown in Table 5, the unbalanced tension working condition simulation is realized by adjusting the tension on both sides by the first servo unit and the second servo unit to verify whether the 20% design unbalanced tension requirement is met.

[0074] The present invention provides a mechanical properties test device and method for suspension wire clamp hardware of overhead power transmission lines. By adjusting the suspension angles on both sides of the suspension hardware string, the simulation of the design working conditions and the extreme working conditions on site is realized through the servo control of the first servo loading unit and the second servo loading unit. The invention can solve the problem that the existing vertical load test of the suspension wire clamp cannot effectively simulate the actual stress condition of the suspension wire clamp, and can test the quality of the suspension wire clamp under various design working conditions and verify the mechanical properties of the suspension wire clamp under extreme conditions, thereby improving the service reliability of the overhead power transmission equipment and ensuring the intrinsic safety of the power transmission equipment.

[0075] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and structure diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in an alternative implementation, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or the flow chart, and the combination of boxes in the structure diagram and / or the flow chart, can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0076] In addition, the functional modules or units in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0077] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a smart phone, a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0078] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mechanical property test method for overhead transmission line suspension wire clamp hardware, applied to an overhead transmission line suspension wire clamp hardware mechanical property test device, the overhead transmission line suspension wire clamp hardware mechanical property test device comprising a suspension hardware string, a first ground wire, a second ground wire, a first acquisition unit, a second acquisition unit, a third acquisition unit, a first loading cable, a second loading cable, a first servo loading unit, a second servo loading unit, an angle adjustment unit and a height adjustment unit, one side of the suspension hardware string is mechanically connected to the first ground wire, the other side of the suspension hardware string is mechanically connected to the second ground wire, the first ground wire is mechanically connected to the second ground wire, and the second ground wire is mechanically connected to the second ground wire. The wire is connected to the first acquisition unit through a steel anchor, the second ground wire is connected to the second acquisition unit through a steel anchor, the first acquisition unit is connected to the first loading cable steel anchor, the second acquisition unit is connected to the second loading cable steel anchor, the first loading cable is connected to the first servo loading unit with a ball joint, the second loading cable is connected to the second servo loading unit with a ball joint, the first loading cable and the second loading cable are pressed with the angle adjustment unit, the upper part of the hanging hardware string is connected to the third acquisition unit through a steel anchor, and the third acquisition unit is pinned to the height adjustment unit, characterized in that: The hanging angles on both sides of the hanging hardware string are adjusted to preset angles by the height adjustment unit and the angle adjustment unit, and the first loading cable and the second loading cable are respectively force loaded by the first servo loading unit and the second servo loading unit, wherein the preset angles include α°, α+10° or α+20°; the deformation of the hanging hardware string is measured, and the load data and inclination data of the first acquisition unit, the second acquisition unit and the third acquisition unit are acquired; and the mechanical analysis of the hanging hardware string is performed according to the deformation, the load data and the inclination data; The height adjustment unit and the angle adjustment unit are used to adjust the overhang angles on both sides of the suspension hardware string to a preset angle, and the first servo loading unit and the second servo loading unit are used to respectively load the first loading cable and the second loading cable with force, wherein the steps include: when the overhang angle on one side of the suspension hardware string is α° and the overhang angle on the other side of the suspension hardware string is α+10° or α+20°, the servo loading unit on the side of the suspension hardware string with a overhang angle of α+10° or α+20° is used to load force step by step in a manner of 10% RTS as a level, and the collection unit loaded on this side reaches the nominal load of the suspension hardware string, and the nominal load is maintained for 60S.

2. The mechanical properties test method for overhead transmission line suspension wire clamp hardware according to claim 1, characterized in that: The first acquisition unit, the second acquisition unit and the third acquisition unit all include a load sensor and an inclination sensor, the angle adjustment unit includes a first angle adjustment module and a second angle adjustment module, the first angle adjustment module and the second angle adjustment module both include a pulley block and an adjustment hole plate, the pulley of the pulley block is pressed on the loading cable, the pulley block is bolted to any adjustment hole of the adjustment hole plate, the hanging angles on both sides of the hanging hardware string are adjusted to a preset angle by the height adjustment unit and the angle adjustment unit, and the first loading cable and the second loading cable are respectively subjected to force loading by the first servo loading unit and the second servo loading unit, comprising: When the overhang angles on both sides of the overhanging hardware string are both α°, the servo loading unit performs force loading step by step in a manner of 10%RTS as a level. After loading to 80%RTS, the force is loaded step by step in a manner of 5%RTS as a level to 95%RTS, and the 95%RTS load is maintained for 60S.

3. The mechanical properties test method of overhead power transmission line suspension wire clamp hardware according to claim 1, characterized in that: The step of adjusting the hanging angles on both sides of the hanging hardware string to a preset angle by the height adjustment unit and the angle adjustment unit, and respectively performing force loading on the first loading cable and the second loading cable by the first servo loading unit and the second servo loading unit comprises: When the overhang angles on both sides of the suspension hardware string are α+10° or α+20°, the servo loading unit performs force loading step by step with 10% RTS as one level, and loads it to the third collection unit to reach the nominal load of the suspension hardware string, and maintains the nominal load for 60S.

4. The mechanical properties test method for overhead transmission line suspension wire clamp hardware according to claim 1, characterized in that: The step of adjusting the hanging angles on both sides of the hanging hardware string to a preset angle by the height adjustment unit and the angle adjustment unit, and respectively performing force loading on the first loading cable and the second loading cable by the first servo loading unit and the second servo loading unit comprises: When the suspension angles on both sides of the suspension hardware string are α°, the loading cable tension load of the servo loading unit on one side is 60% of the ground wire RTS, and the horizontal tension difference of the servo loading unit on the other side is 20% of the ground wire RTS, and the load is maintained for 60S.

5. The mechanical properties test method for overhead power transmission line suspension wire clamp hardware according to claim 4, characterized in that: The critical condition of the horizontal tension difference is: ， Among them, T1 and T2 are the load values ​​of the load sensor connected to the ground wire at both ends, T1 is the load value controlled to be 60%±1% of the ground wire RTS, and β1 and β2 are the values ​​of the tilt sensor.

6. The mechanical properties test method for overhead power transmission line suspension wire clamp hardware according to claim 1, characterized in that: The strength of the first loading cable and the second loading cable is selected to be more than 1.5 times that of the first ground wire and the second ground wire.

Images