Device and method for testing icing bonding strength of overhead transmission conductor

Abstract

The invention discloses a device and a method for testing icing bonding strength of an overhead transmission conductor. The testing device comprises a conductor fixing clamp, an icing mold, a clamping clamp, a tensile machine, a tensile machine stepping control system and a data processing module. The wire fixing clamp fixes two ends of the wire; an icing supporting plate in the icing mold is combined with a wire clamping groove support, the icing supporting plate is tightly attached to the surface of a wire to form an icing area, and the icing supporting plate and the wire clamping groove support can be separated. The lower end of the clamping fixture is provided with symmetrical L-shaped hook claws with adjustable spacing to clamp the icing supporting plate, and the upper part of the clamping fixture is connected with the tensile machine. And the tensile machine applies upward tensile force to peel the ice on the ice-coated supporting plate from the wire. And the tensile machine stepping control system controls the tensile machine to move and measures the tensile force in real time. The data processing module records the peak tension at the moment of icing stripping, and the icing bonding strength is calculated according to the peak tension and the icing stripping area. According to the testing device and the testing method, accurate and reliable detection of the interface bonding strength of the icing and the wire of the overhead transmission wire is realized.

Description

Technical Field

[0001] The present invention relates to the technology of transmission line icing test, and particularly to a device and method for testing the icing adhesion strength of overhead transmission conductors. Background Art

[0002] In winter, transmission lines are vulnerable to the impact of line icing. Especially in areas with low temperature and high humidity such as passes, lakes, and rivers, it is easy to cause serious icing of transmission lines, resulting in an increase in the load of overhead transmission conductors and transmission towers. In severe cases, accidents such as tower collapse and wire breakage may occur. Currently, the de-icing methods for transmission lines include DC melting ice, AC short-circuit melting ice, and UAV de-icing. However, these methods are passive anti-icing methods, and some of them require the line to be taken out of operation, resulting in a reduction in the stability of the power grid. Treating the surface of the overhead transmission conductor to reduce the icing adhesion force on the conductor surface is a feasible anti-icing solution. However, there is currently a lack of accurate and reliable test methods for detecting the icing adhesion strength on the surface of overhead transmission conductors.

[0003] It should be noted that the information disclosed in the above background art section is only used for understanding the background of the present application. Therefore, it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The main purpose of the present invention is to overcome the defects existing in the above background art, and to provide a device and method for testing the icing adhesion strength of overhead transmission conductors.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A device for testing the icing adhesion strength of overhead transmission conductors, comprising: A wire fixing fixture for fixing both ends of the overhead wire; An icing mold, including a separable icing support plate and a wire slot bracket. When the icing support plate and the wire slot bracket are combined, the icing support plate covers the area other than the wire slot on the wire slot bracket and is in close contact with the surface of the overhead wire placed in the wire slot to form an icing area; A clamping fixture, the lower end of which is provided with symmetric L-shaped claws with adjustable spacing for clamping the icing support plate, and the upper part of the clamping fixture is connected to a tensile testing machine; A tensile testing machine, connected to the clamping fixture, for applying an upward pulling force to drive the icing support plate to strip the icing from the surface of the overhead wire; A tensile testing machine stepping control system for controlling the movement of the tensile testing machine and detecting the tensile force value in real time; A data processing module, communicating with the tensile testing machine stepping control system, for recording the peak tensile force at the moment of icing stripping and calculating the icing adhesion strength according to the peak tensile force and the icing stripping area.

[0006] Further, the wire fixing clamp includes a semi-circular hoop and a fixed base. The fixed base is provided with a semi-circular groove matching the diameter of the overhead wire, and the semi-circular hoop is connected by bolts to clamp the overhead wire.

[0007] Further, the ice-covered support plate is made of metal, and the wire slot bracket is made of epoxy resin. The lengths of both are less than the length of the overhead wire and are arranged parallel to the overhead wire.

[0008] Further, a trapezoidal groove is provided on the lower surface of the ice-covered support plate, and a trapezoidal protrusion adapted to the trapezoidal groove is provided on the upper surface of the wire slot bracket. When the ice-covered support plate and the wire slot bracket are combined, they are limited and fixed by the trapezoidal groove and the trapezoidal protrusion.

[0009] Further, the symmetric L-shaped claws of the clamping fixture are arranged in a structure with adjustable spacing.

[0010] A method for testing the ice adhesion strength of an overhead transmission wire uses the above-mentioned device for testing the ice adhesion strength of an overhead transmission wire, and includes the following steps: S1. Test sample preparation: Place the overhead wire in an ice-covering mold, and form ice on the surface of the wire and the ice-covered support plate by spraying cooled water in an artificial climate chamber. Then, remove the ice layer exceeding the ice-covered support plate. S2. Test arrangement: Fix both ends of the ice-covered wire to the wire fixing clamp, clamp the ice-covered support plate with the clamping fixture, and connect it to a tensile testing machine. S3. Ice-covered peeling test: Control the tensile testing machine to apply a tensile force to the clamping fixture at a set speed through the step control system of the tensile testing machine, and record the peak tensile force at the moment of ice-covered peeling in real time. S4. Calculation of adhesion strength: Calculate the ice adhesion strength according to the peak tensile force and the ice-covered peeling area.

[0011] Further, in step S1, the environmental temperature drops to -3°C at a rate of 0.5°C / min to 5°C / min and is maintained for at least 1 hour; in step S3, the ice-covered temperature during the tensile test is -3°C.

[0012] Further, in step S3, the moving speed range of the tensile testing machine is 0.5 mm / min to 12 mm / min, and a uniform tensile force is applied through the step control system of the tensile testing machine; among them, the tensile force application speeds include 3 mm / min, 6 mm / min, and 9 mm / min, and each speed is repeatedly tested 3 times.

[0013] Further, in step S4, when the ice coating is completely separated, the geometric area of the ice-coated area of the wire is used as the ice coating peeling area. When the ice coating is not completely separated, the actual ice coating peeling area is calculated by taking images.

[0014] Further, in step S4, the ice coating adhesion strength is calculated according to the following formula:

[0015] where M is the ice coating adhesion strength, G is the peak tensile force, H is the total gravity of the peeled ice and the ice coating support plate, and I is the ice coating peeling area.

[0016] The present invention has the following beneficial effects: The present invention provides a device and method for testing the ice coating adhesion strength of an overhead transmission wire. By integrating a wire fixing fixture, an ice coating mold, a clamping fixture, a tensile testing machine and a control system, accurate and reliable detection of the adhesion strength at the interface between the ice coating and the wire is achieved. Through the design of a separable ice coating mold combined with an ice coating support plate and a wire slot bracket, accurate positioning of the ice-coated area of the wire is ensured and the peeling force on the ice coating support plate is uniform during testing, realizing the standardized preparation and controllable peeling of ice coating samples, significantly improving the repeatability and accuracy of testing, and providing reliable basic conditions for quantifying the ice coating adhesion strength; by applying a tensile force uniformly at a constant speed through the step control system of the tensile testing machine and collecting peak data in real time, and calculating in combination with the ice coating peeling area, quantitative evaluation of the ice coating adhesion strength is achieved. Further, the adjustable design of the fixture and the environmental temperature control are synergistically optimized, improving the repeatability and reliability of testing. The present invention provides high-precision experimental support for the research and development of anti-icing technologies for transmission lines.

[0017] Other beneficial effects in the embodiments of the present invention will be further described below. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the device for testing the ice coating adhesion strength of an overhead transmission wire according to an embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of the wire fixing fixture according to an embodiment of the present invention.

[0020] Figure 3 It is a combined schematic diagram of the wire slot bracket and the ice coating support plate according to an embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram of the wire slot bracket according to an embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of the clamping fixture according to an embodiment of the present invention.

[0023] Figure 6 It is a schematic diagram of the wire ice coating according to an embodiment of the present invention.

[0024] Figure 7 This is a flowchart of the test method according to an embodiment of the present invention.

[0025] Reference numerals: 1 - wire fixing clamp, 2 - ice - covering support plate, 3 - overhead wire, 4 - ice covering, 5 - clamping fixture, 6 - tensile testing machine, 7 - tensile testing machine stepping control system, 8 - data processing module, 9 - wire slot bracket, 101 - semi - circular hoop, 102 - fixed base. Detailed implementation manners

[0026] The following provides a detailed description of the implementation manners of the present invention. It should be emphasized that the following description is merely exemplary and not intended to limit the scope of the present invention and its applications.

[0027] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be for a fixing function or for a coupling or communicating function.

[0028] It should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0030] Refer to Figures 1 to 6 , an embodiment of the present invention provides an overhead transmission line wire ice - adhesion strength test device, including a wire fixing clamp 1, an ice - covering mold, a clamping fixture 5, a tensile testing machine, a tensile testing machine stepping control system 7, and a data processing module 8 (such as an industrial control computer).

[0031] The wire fixing fixture 1 is used to fix both ends of the overhead wire 3. The icing mold includes a separable icing support plate 2 and a wire slot bracket 9. When the icing support plate 2 is combined with the wire slot bracket 9, the icing support plate 2 covers the area of the wire slot bracket 9 except for the wire slots, and closely adheres to the surface of the overhead wire 3 placed in the wire slots to form an icing 4 area. The lower end of the clamping fixture 5 is provided with symmetric L-shaped claws with adjustable spacing for clamping the icing support plate 2, and the upper part of the clamping fixture 5 is connected to a tensile testing machine. The tensile testing machine 6 is connected to the clamping fixture 5 and is used to apply an upward tensile force to cause the icing support plate 2 to drive the icing 4 to peel off the surface of the overhead wire 3. The tensile testing machine stepping control system 7 is used to control the movement of the tensile testing machine 6 and detect the tensile value in real time. The data processing module 8 communicates with the tensile testing machine stepping control system 7 and is used to record the peak tensile force at the moment when the icing 4 peels off, and calculate the icing bonding strength according to the peak tensile force and the icing peeling area. With this design, especially through the specific design and coordinated action of the wire fixing fixture, the icing mold and the clamping fixture, the testing device realizes high-precision and high-reliability testing of the icing bonding strength.

[0032] Refer to Figure 2 , in some embodiments, the wire fixing fixture 1 includes a semi-circular hoop 101 and a fixed base 102. The fixed base 102 is provided with a semi-circular groove matching the diameter of the overhead wire 3, and the semi-circular hoop 101 is connected by bolts to clamp the overhead wire 3.

[0033] In some embodiments, the icing support plate 2 is made of metal, and the wire slot bracket 9 is made of epoxy resin. The lengths of both are less than the length of the overhead wire 3 and are arranged in parallel with the overhead wire 3.

[0034] Refer to Figure 3 and Figure 4 , in some embodiments, the lower surface of the icing support plate 2 is provided with a trapezoidal groove, and the upper surface of the wire slot bracket 9 is provided with a trapezoidal protrusion adapted to the trapezoidal groove. When the icing support plate 2 is combined with the wire slot bracket 9, it is limited and fixed through the trapezoidal groove and the trapezoidal protrusion.

[0035] In some embodiments, the symmetric L-shaped claws of the clamping fixture 5 are preferably set to have a structure with adjustable spacing.

[0036] Refer to Figure 7 , an embodiment of the present invention also provides a method for testing the icing bonding strength of an overhead transmission wire, using the overhead transmission wire icing bonding strength testing device of any of the foregoing embodiments, including the following steps: Step S1. Preparation of test samples: Place the overhead conductor 3 in an icing mold. In an artificial climate chamber, spray cooled water to form ice coating 4 on the surface of the conductor and the ice coating plate 2, and then remove the ice layer exceeding the ice coating plate 2. Step S2. Test setup: Fix both ends of the iced conductor to the conductor fixing fixture 1, clamp the ice coating plate 2 with the clamping fixture 5, and connect it to the tensile testing machine 6. Step S3. Ice coating peeling test: Control the tensile testing machine 6 to apply a tensile force to the clamping fixture 5 at a set speed through the stepper control system 7 of the tensile testing machine, and record the peak tensile force at the moment of ice coating peeling in real time. Step S4. Calculation of bonding strength: Calculate the ice coating bonding strength based on the peak tensile force and the ice coating peeling area.

[0037] In some embodiments, in Step S1, the ambient temperature is decreased to -3°C at a rate of 0.5°C / min to 5°C / min and maintained for at least 1 hour; in Step S3, the ice coating temperature during the tensile test is -3°C.

[0038] In some embodiments, in Step S3, the moving speed range of the tensile testing machine is 0.5 mm / min to 12 mm / min, and the uniform tensile force application is achieved through the stepper control system 7 of the tensile testing machine; preferably, the tensile force application speeds include 3 mm / min, 6 mm / min, and 9 mm / min, and each speed is tested 3 times repetitively.

[0039] In some embodiments, in Step S4, when the ice coating is completely separated, the geometric area of the ice-coated area of the conductor is used as the ice coating peeling area; when the ice coating is not completely separated, the actual ice coating peeling area is calculated by taking images.

[0040] In some embodiments, in Step S4, the ice coating bonding strength is calculated according to the following formula:

[0041] where M is the ice coating bonding strength, G is the peak tensile force, H is the total gravity of the peeled ice and the ice coating plate, and I is the ice coating peeling area.

[0042] The following further describes specific embodiments of the present invention.

[0043] A test device for the bonding strength of non-uniform ice coating on the surface of an overhead transmission conductor, the device includes a conductor fixing fixture 1, an ice coating plate 2, an overhead conductor 3, an ice coating 4, a clamping fixture 5, a tensile testing machine 6, a stepper control system 7 of the tensile testing machine, and a data processing module 8. The structural schematic diagram of the device is as Figure 1 shown.

[0044] The conductor fixing fixture 1 is as Figure 2As shown, the wire fixing clamp 1 is composed of two parts: a semi-circular hoop 101 and a fixing base 102. The fixing base 102 is designed with a semi-circular groove having the same diameter as the wire, into which the wire can be embedded. The semi-circular hoop 101 and the fixing base 102 are fixedly connected by bolts. The fixing base 102 is connected to the tensile machine 6 as a whole. When fixing the wire, two or more wire fixing clamps 1 are used to fix both ends of the wire. First, place the wire in the semi-circular groove of the fixing base 102, then buckle the semi-circular hoop 101, and use bolts to connect the semi-circular hoop 101 and the fixing base 102 to clamp the wire. Preferably, the thickness A of the wire fixing clamp is A≥20mm.

[0045] The icing mold is composed of two parts: an icing support plate 2 and a wire slot bracket 9, as Figure 3 shown. The icing support plate 2 is in the shape of a cuboid, placed on the wire slot bracket 9 and parallel to the wire in direction. The icing support plate 2 is in close contact with the wire. The lengths of both the icing support plate 2 and the wire slot bracket 9 are B, which are both less than the wire length C, and B≤C - 2*A.

[0046] Preferably, the icing support plate 2 is a steel plate with a thickness D≥3 mm, and the material of the wire slot bracket 9 is epoxy resin. The wire is an aluminum stranded wire, the diameter E of the test wire is E≥30 mm, and the length C of the test wire is C≥10*E mm.

[0047] The structure of the wire slot bracket 9 is as Figure 4 shown. The wire slot bracket 9 is designed with a semi-circular groove for placing and fixing the wire. The diameter of the semi-circular groove is the same as the length of the wire diameter E, and the depth F of the semi-circular groove is F = E / 2 - D. The icing support plate 2 is designed with 4 trapezoidal grooves, and each wire slot bracket 9 is designed with 2 trapezoidal protrusions. The grooves and protrusions are used for the fixation and limitation between the icing support plate 2 and the wire slot bracket 9. The wire slot bracket 9 and the icing support plate 2 can be in a direction perpendicular to the wire slot bracket 9. After the wire slot bracket 9 and the icing support plate 2 are stacked, they cannot move or rotate horizontally with respect to each other. Through the design of the trapezoidal protrusions and grooves, they can be separated from the wire slot bracket 9 after the wire and the support plate are iced. Each wire slot bracket 9 is used in cooperation with two icing support plates 2, and the installation method is as Figure 3 shown.

[0048] The clamping fixture 5 is used to clamp the icing support plate 2, and the structure is as Figure 5 shown. The lower hook claws of the clamping fixture 5 are in the shape of symmetric "L" shapes. The distance between the two symmetric "L" - shaped hook claw structures can be adjusted steplessly by a screw rod for adapting to icing trays of different sizes. The clamping fixture 5 is connected to the tensile machine through the upper through - hole.

[0049] The tensile testing machine 6 is used to provide the tensile force required for the ice to break away from the surface of the conductor. The conductor fixing fixture 1 is installed at the bottom of the tensile testing machine 6, and the conductor is fixed on the bottom of the tensile testing machine 6 by clamping the semi-circular hoop 101. The upper lifting structure of the tensile testing machine 6 is connected to the clamping fixture 5, and the tensile force is transmitted to the ice-covered tray 2 through the clamping fixture 5 to peel the ice as a whole from the surface of the conductor. The stepping speed of the tensile testing machine 6 is controlled by the stepping control system 7 of the tensile testing machine. Preferably, the tensile testing machine can apply a tensile force at a moving speed of 0.5 mm / min to 12 mm / min.

[0050] The stepping control system of the tensile testing machine controls the rotation of the internal electrode of the tensile testing machine, drives the clamping fixture 5 to move up and down, transmits the tensile force to the ice-covered surface through the clamping fixture 5, and the stepping control system 7 of the tensile testing machine is equipped with a tensile force detection module for measuring the tensile force value in real time. The stepping control system 7 of the tensile testing machine can control the lifting speed of the tensile testing machine 6 to make the tensile force increase evenly and gently, reducing the measurement error.

[0051] The data processing module 8, such as an industrial control computer, communicates with the stepping control system 7 of the tensile testing machine in real time, controls the clamping fixture to move up and down, measures the tensile force value in real time, outputs the mechanical curve of the ice breaking away from the surface of the conductor, and records the tensile force value as G at the moment when the ice peels off the conductor.

[0052] The flow of the test method is as Figure 7 shown, and specifically includes the following steps: Step S1. Preparation of test samples. Place the conductor in the ice-covering mold (in the semi-circular groove of the conductor slot bracket 9, place two ice-covered trays 2 beside the conductor, and the grooves of the ice-covered trays 2 cooperate with the trapezoidal protrusions of the conductor slot bracket 9 for fixation). The ice covering is carried out in an artificial climate chamber by spraying, so that the ice-covered trays 2 and the conductor are covered with ice. The ice-covering schematic diagram is as Figure 6 shown.

[0053] Preferably, to reduce errors, the length of the test conductor is 30 cm ≤ C ≤ 60 cm.

[0054] The ice covering is carried out in an artificial climate chamber. The supercooled water droplets are ejected through the nozzle and hit the surfaces of the conductor and the ice-covered tray 2 unidirectionally from above the conductor to form ice on the conductor and the ice-covered tray 2. Due to the shielding of the conductor and the ice-covered tray 2 and the supercooled state of the water droplets, the water droplets will freeze immediately after hitting the surfaces of the conductor and the ice-covered tray 2, and no ice layer will adhere to the conductor slot bracket 9. After the ice covering is completed, the conductor slot bracket 9 can be separated from the ice-covered tray 2.

[0055] After the conductor is ice-covered, remove the ice on the conductor that is longer than the ice-covered tray 2, leaving only the ice between the ice-covered tray 2 and the conductor.

[0056] Preferably, the environmental chamber is controlled to cool down to -3°C at a rate of 0.5°C / min to 5°C / min and maintained for at least 1 hour. The icing temperature during the tensile test is -3°C.

[0057] Step S2. Test setup. Separate the wire slot bracket 9 from the icing support plate 2 and the test wire in the prepared test sample. Then fix both ends of the wire on the wire fixing fixture 1 of the tensile testing machine, and use the clamping fixture to clamp the icing support plate 2, so that the wire and the icing support plate 2 are respectively fixed to the components applying force on the tensile testing machine.

[0058] After the wire slot bracket 9 is separated from the icing support plate 2 and the test wire, due to the bonding effect of the ice, the wire and the icing support plate 2 are fixed together by the ice. The wire is fixed on the wire fixing fixture 1 to ensure that the wire is in a horizontal state.

[0059] Preferably, the test is carried out in an artificial climate chamber with the temperature set at -3°C to prevent the ice from melting and reduce errors.

[0060] Step S3. Ice peeling test. The industrial control computer configures the test plan. Through the stepping control system of the tensile testing machine, the clamping fixture 5 is controlled to move up and down to change the tensile value. Turn on the industrial control computer and set the initialization. The detection value of the tensile sensor is 0. The industrial control computer measures the value of the tensile sensor in real time. When the ice peels off the wire surface, the tensile value G is automatically recorded, and a data graph of the tensile force increase is generated.

[0061] During the test of the wire, no obvious bending phenomenon occurs on the wire fixing fixture 1 under the action of the tensile force.

[0062] Preferably, the tensile force is applied at stepping speeds of 3 mm / min, 6 mm / min, and 9 mm / min respectively, and each stepping speed is tested 3 times.

[0063] Step S4. Calculation of ice bonding strength. According to the above steps, the ice is peeled off the wire by applying a tensile force. After the test, measure the total gravity H of the peeled ice and the icing support plate. Calculate the size of the area where the ice peels off after peeling and record it as I. According to the measured mechanical value and area measurement value, calculate the ice bonding strength M at this time according to the following formula:

[0064] Calculation of the size of the ice peeling area. Observe whether the interface is completely separated when the ice peels off the wire. If the ice is completely separated, the area I is the ice-covered area of the wire, that is:

[0065] where E is the wire diameter and B is the length of the icing support plate and the wire slot bracket.

[0066] If the ice accretion does not completely separate from the conductor, the actual peeled ice accretion area is calculated by the image shooting method.

[0067] In summary, the present invention provides an ice accretion bonding strength testing device and method for overhead transmission conductors, realizing accurate and reliable detection of the ice accretion bonding strength on the surface of overhead transmission conductors. The present invention has the following remarkable advantages: (1) A device for measuring the ice accretion bonding strength of a conductor is provided, and an ice accretion mold is designed, giving an effective solution for the accurate measurement of the ice accretion bonding strength of the conductor.

[0068] (2) The ice accretion bonding force is measured by the synergistic action of the ice accretion mold, the clamping fixture, and the conductor fixing fixture, which is beneficial to improving the measurement accuracy.

[0069] (3) The fixed bonding strength is calculated according to the force magnitude and the peeled area of the ice accretion, realizing the quantification of the bonding performance.

[0070] (4) When the present device measures the bonding strength, the ice accretion fixture is uniformly stressed, and the test data has high repeatability, avoiding errors caused by accidental situations and making the test more accurate.

[0071] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should all be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the protection scope of the patent application.

Claims

1. An icing adhesion strength test device for overhead transmission conductors, characterized in that, Comprising: A wire fixing clamp for fixing both ends of an overhead wire; An icing mold, including a separable icing support plate and a wire slot bracket. When the icing support plate is combined with the wire slot bracket, the icing support plate covers the area of the wire slot bracket except for the wire slots, and is in close contact with the surface of the overhead wire placed in the wire slots to form an icing area; A clamping fixture, with symmetric L-shaped claws with adjustable spacing at its lower end for clamping the icing support plate, and the upper part of the clamping fixture is connected to a tensile testing machine; A tensile testing machine, connected to the clamping fixture, for applying an upward pulling force to cause the icing support plate to drive the ice to peel off the surface of the overhead wire; A tensile testing machine stepping control system for controlling the movement of the tensile testing machine and real-time detecting the pulling force value; A data processing module, communicating with the tensile testing machine stepping control system, for recording the peak pulling force at the moment of ice peeling, and calculating the ice adhesion strength according to the peak pulling force and the ice peeling area; 2. The icing adhesion strength testing device for overhead transmission conductors according to claim 1, wherein The wire fixing clamp includes a semi-circular hoop and a fixed base. The fixed base is provided with a semi-circular groove matching the diameter of the overhead wire, and the semi-circular hoop is connected by bolts to clamp the overhead wire; 3. The icing bond strength test device for overhead transmission conductors according to claim 1, characterized in that, The icing support plate is made of metal, and the wire slot bracket is made of epoxy resin. The lengths of both are less than the length of the overhead wire and are arranged parallel to the overhead wire; 4. The icing bond strength testing device for overhead transmission conductors according to claim 1, characterized in that, The lower surface of the icing support plate is provided with trapezoidal grooves, and the upper surface of the wire slot bracket is provided with trapezoidal protrusions adapted to the trapezoidal grooves. When the icing support plate is combined with the wire slot bracket, it is limited and fixed by the trapezoidal grooves and the trapezoidal protrusions; 5. The icing adhesion strength test device for overhead transmission conductors according to any one of claims 1 to 4, characterized in that The symmetric L-shaped claws of the clamping fixture are set to have an adjustable spacing structure; 6. A method for testing the icing adhesion strength of an overhead transmission line conductor, using the overhead transmission line conductor icing adhesion strength testing device according to any one of claims 1 to 5, characterized in that, Including the following steps: S1. Test sample preparation: Place the overhead wire in the icing mold, and form ice on the surface of the wire and the icing support plate by spraying cooled water in an artificial climate chamber, and then remove the ice layer exceeding the icing support plate; S2. Test arrangement: Fix both ends of the iced wire to the wire fixing clamp, clamp the icing support plate with the clamping fixture, and connect it to the tensile testing machine; S3. Ice peeling test: Control the tensile testing machine to apply a pulling force to the clamping fixture at a set speed through the tensile testing machine stepping control system, and record the peak pulling force at the moment of ice peeling in real time; S4. Bond strength calculation: Calculate the ice adhesion strength according to the peak pulling force and the ice peeling area; 7. The test method according to claim 6, wherein In step S1, the ambient temperature drops to -3°C at a rate of 0.5°C / min to 5°C / min and is maintained for at least 1 hour; in step S3, the ice temperature during the tensile test is -3°C; 8. The test method according to claim 6, characterized in that, In step S3, the moving speed range of the tensile testing machine is 0.5 mm / min to 12 mm / min, and uniform pulling force application is realized through the tensile testing machine stepping control system; among them, the pulling force application speeds include 3 mm / min, 6 mm / min, and 9 mm / min, and each speed is repeatedly tested 3 times; 9. The test method according to claim 6, characterized in that, In step S4, when the ice is completely separated, the geometric area of the wire icing area is used as the ice peeling area. When the ice is not completely separated, the actual ice peeling area is calculated by the method of taking pictures.

10. The test method according to any one of claims 6 to 9, characterized in that, In step S4, the ice adhesion strength is calculated according to the following formula: ； Where M is the ice adhesion strength, G is the peak tensile force, H is the total gravity of the peeled ice and the ice-covered pallet, and I is the ice peeling area.

Images