An extensometer for stress-strain testing of overhead conductors

Abstract

This utility model discloses an extensometer for stress-strain testing of overhead conductors, including a support plate, two pipe clamps, and a magnetic base. The support plate is made of ferromagnetic material. The magnetic base is attracted and fixed to the support plate. A two-dimensional dovetail slide is fixedly installed on the upper side of the magnetic base. A mounting bracket is fixedly connected to the slider on the side of the dovetail slide. A pull-string displacement sensor is fixedly installed in the mounting bracket. The side wall of the mounting bracket has a circular hole through which the pull-string displacement sensor's pull-string extends. The outer end of the pull-string is connected to a flange nut. The pipe clamps are used to fix the conductor to be tested. An L-shaped bracket is fixedly installed on one side of the pipe clamp. A suction cup electromagnet is attracted to the front of the bracket, and the flange nut is used to attract the suction cup electromagnet. This extensometer can conveniently and quickly change the measuring gauge length. It uses two pull-string displacement sensors to obtain the deformation within the gauge length. The pull-string displacement sensors are completely enclosed by the mounting bracket to prevent bumps and damage.

Description

Technical Field

[0001] This utility model relates to the field of conductor testing technology, specifically to an extensometer for stress-strain testing of overhead conductors. Background Technology

[0002] The stress-strain characteristics of overhead conductors are a core mechanical problem in power engineering, involving a comprehensive balance of material properties, environmental loads, and safety design. According to the testing standard GB / T 20141-2006 / IEC 62219:2002 "Concentric Stranded Overhead Conductors," the stress-strain test method requires an extensometer with an ultra-large gauge length that is not fixed. However, the standard does not specify a particular gauge length, leaving it to be defined by the user. Based on the actual testing conditions of most users, the gauge length is typically set between 2m and 10m. Therefore, the extensometer must be able to quickly change its gauge length during use; furthermore, overhead conductors come in various specifications, and the extensometer must also be able to easily clamp specimens of different specifications.

[0003] In actual testing, the overhead conductor will rotate to a certain extent. In addition, the test needs to be loaded to 85% RTS (designed breaking force). During this period, the overhead conductor sample is very likely to break. When the sample breaks, it will have a great impact force and vibration on the extensometer clamped on the sample. Therefore, it is not advisable to choose a glass grating ruler to collect deformation in this type of test. Utility Model Content

[0004] The purpose of this invention is to provide an extensometer for stress-strain testing of overhead conductors, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an extensometer for stress-strain testing of overhead conductors, comprising a support plate, two pipe clamps, and a magnetic base. The support plate is made of ferromagnetic material, and the magnetic base is adsorbed and fixed to the support plate. A two-dimensional dovetail slide is fixedly installed on the upper side of the magnetic base. A mounting bracket is fixedly connected to the slider on the side of the dovetail slide. A pull-string displacement sensor is fixedly installed in the mounting bracket. A circular hole is provided on the side wall of the mounting bracket, and the pull-string of the pull-string displacement sensor is pulled out from the circular hole. A flange nut is connected to the outer end of the pull-string. The pipe clamps are used to fix the conductor to be tested. An L-shaped bracket is fixedly installed on one side of the pipe clamp. A suction cup electromagnet is adsorbed on the front side of the bracket, and the flange nut is used to attract the suction cup electromagnet.

[0006] Preferably, the mounting bracket is fixedly connected to a nylon protective pad at the round hole, and the nylon protective pad has a corresponding through hole at the round hole.

[0007] Preferably, the dovetail groove slide is locked in position by hand-tightening bolts.

[0008] Compared with the prior art, the beneficial effects of this utility model are: the extensometer of this utility model can conveniently and quickly change the measuring gauge length, and uses two pull-wire displacement sensors to obtain the deformation within the gauge length. The pull-wire displacement sensors are completely wrapped by the mounting bracket to prevent bumps and damage. During the test, the outer end of the pull rope is fixed by magnetic attraction. When the wire sample breaks, the pull rope can be separated from the pipe clamp to prevent impact damage. Attached Figure Description

[0009] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0010] Figure 2 This is a schematic diagram of the main structure of this utility model.

[0011] In the diagram: 1. Support plate; 2. Magnetic base; 3. Tail slot slide; 4. Mounting bracket; 5. Cable-stayed displacement sensor; 6. Pipe clamp; 7. Bracket; 8. Suction cup electromagnet; 9. Flange nut; 10. Nylon protective pad. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0013] Please see Figure 1-2 This utility model provides a technical solution: an extensometer for stress-strain testing of overhead conductors, comprising a support plate 1, two pipe clamps 6, and a magnetic base 2 (a commercially available mature product). The support plate 1 is made of ferromagnetic material. The magnetic base 2 is adsorbed and fixed to the support plate 1. The distance between the two magnetic bases 2 can be freely adjusted according to the length of the conductor to be tested. A two-dimensional dovetail slide 3 is fixedly installed on the upper side of the magnetic base 2. The dovetail slide 3 locks the slider in the two-dimensional coordinate plane by a hand-tightening bolt. A mounting bracket 4 is fixedly connected to the slider on the side of the dovetail slide 3. A pull-string displacement sensor 5 is fixedly installed in the mounting bracket 4. The pull-string displacement sensor 5 is placed in the mounting bracket 4 to prevent collision.

[0014] The mounting bracket 4 has a round hole on its side wall. The pull rope of the pull rope displacement sensor 5 extends out through the round hole. A nylon protective pad 10 is fixedly connected to the mounting bracket 4 at the round hole. The nylon protective pad 10 has a corresponding through hole at the round hole. The function of the nylon protective pad 10 is to reduce wear on the pull rope. A flange nut 9 is connected to the outer end of the pull rope. A pipe clamp 6 is used to fix it to the wire to be tested. An L-shaped bracket 7 is fixedly installed on one side of the pipe clamp 6. A suction cup electromagnet 8 is attracted to the front of the bracket 7. The flange nut 9 is used to attract the suction cup electromagnet 8. When the wire is broken, the movement stroke of the pipe clamp 6 is large, and the flange nut 9 can disengage from the suction cup electromagnet 8, thereby preventing the pull rope from being broken and damaged.

[0015] Working principle: The two magnetic gauge holders 2 can be freely adjusted on the support plate 1 to accommodate test wires of different lengths (i.e., quickly change the gauge length). The tail groove slide 3 on the magnetic gauge holder 2 can finely adjust the position of the mounting bracket 4 and the pull-string displacement sensor 5. In use, the pull rope is pulled out by the suction cup electromagnet 8 as the wire is stretched to measure the length change.

[0016] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An extensometer for stress-strain testing of overhead conductors, comprising a support plate (1), two pipe clamps (6), and a magnetic base (2), wherein the support plate (1) is made of ferromagnetic material, and the magnetic base (2) is adsorbed and fixed to the support plate (1), characterized in that: A two-dimensional dovetail slide (3) is fixedly installed on the upper side of the magnetic base (2). A mounting bracket (4) is fixedly connected to the side slider of the dovetail slide (3). A pull-rope displacement sensor (5) is fixedly installed in the mounting bracket (4). A circular hole is provided on the side wall of the mounting bracket (4). The pull rope of the pull-rope displacement sensor (5) is pulled out from the circular hole. A flange nut (9) is connected to the outer end of the pull rope. The pipe clamp (6) is used to fix the wire to be tested. An L-shaped bracket (7) is fixedly installed on one side of the pipe clamp (6). A suction cup electromagnet (8) is attracted to the front side of the bracket (7). The flange nut (9) is used to attract the suction cup electromagnet (8).

2. The extensometer for use in a stress-strain test of an overhead conductor according to claim 1, characterized in that: The mounting bracket (4) has a nylon protective pad (10) fixedly connected at the round hole, and the nylon protective pad (10) has a corresponding through hole at the round hole.

3. The extensometer for use in a stress-strain test of an overhead conductor according to claim 1, characterized in that: The dovetail groove slide (3) is locked in position by hand-tightening bolts.

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