Pre-stranded wire binding fatigue testing device for overhead distribution line

Abstract

The utility model discloses an overhead distribution line pre-stranding type binding wire fatigue testing machine device, include: frame, guardrail, left fixed unit, left motion unit, support unit, right motion unit, right fixed unit, control box, left fixed unit and right fixed unit be by screw, nut, force sensor, fixed ring constitute, for the measured electric wire is fixed in the both ends of device, left motion unit and right motion unit be by servo electric jar, wire clamp constitute, and it is located respectively in the intermediate position of left, right fixed unit and support unit, for the measured electric wire produces synchronous reciprocating motion's excitation, support unit, and it is via insulator and the recess on it and support the measured electric wire. The fatigue testing machine device above, and the equipment structure is simple and easy to manufacture, and system loading holds the load stability, and two -way dynamic collaborative control, and the force value precision is high, can satisfy each fatigue test specification technical requirement.

Description

Technical Field

[0001] This utility model relates to a pre-twisted wire binding fatigue testing machine device for overhead power distribution lines, belonging to the field of fatigue testing machine measurement and control technology. Background Technology

[0002] The fatigue mechanical property testing machine is used for tensile / compression fatigue mechanical property testing of metallic and non-metallic materials. It can perform tensile fatigue, bending fatigue, shear fatigue tests, etc., and can realize low-cycle and high-cycle fatigue, crack propagation and fracture mechanics tests. It meets the testing standards such as GB / T 3075 Axial fatigue test method for metals and JJG 556-2011 Axial force fatigue testing machine.

[0003] As a precision instrument, the fatigue mechanical property testing machine is a fundamental piece of equipment for industrial fatigue testing and quality inspection. On the one hand, fatigue testing machines have very high control requirements, making their implementation technically challenging and representing one of the key technological barriers that the domestic measurement and control field needs to overcome. On the other hand, the efficiency of fatigue testing machines is crucial; how to quickly and effectively meet the needs of testing projects is a key focus within the industry. Furthermore, there are many types of equipment used for fatigue testing, and a large number of non-standard devices are used to meet the testing requirements of various industries and enterprises, thus the technical requirements for these devices vary.

[0004] There is a specific test regulation T / CSEE0127-2019 for fatigue testing of pre-twisted wires used in overhead power distribution lines. It requires that both ends of an insulated conductor with a length of not less than 8m be fixed on the test device, and that a transverse reciprocating force of 0.5Hz~1.0Hz be applied to the conductor at a distance of 2m from the insulator. The fatigue test result of the conductor under test is determined after 10,000 cycles. Summary of the Invention

[0005] The purpose of this utility model is to realize a pre-stretched fatigue testing machine device for overhead power distribution lines with simple structure, fast loading, fast and stable load holding, and high control accuracy. The technical problems to be solved include: the designed device has a compact structure that is easy to manufacture, and the fatigue control has high accuracy and is easy to control.

[0006] The technical solution adopted is: a pre-stretched fatigue testing machine device for overhead power distribution lines, comprising: a frame, guardrail, left fixed unit, left moving unit, support unit, right moving unit, right fixed unit, and control box; the left and right fixed units are composed of screws, nuts, force sensors, and fixing rings, used to fix the wire under test to both ends of the device; the left and right moving units are composed of servo cylinders and wire clamps, respectively located in the middle of the left and right fixed units and the support unit, used to generate synchronous reciprocating motion excitation for the wire under test; the support unit supports the wire under test via insulators and their notches.

[0007] Furthermore, the wire under test is mounted on the device via a left fixing unit, a support unit, and a right fixing unit, and is subjected to synchronous reciprocating motion excitation by the left and right motion units to achieve fatigue control.

[0008] Furthermore, the force sensors of the left and right fixed units are connected to the control box to collect force value changes during the fatigue test of the device.

[0009] Furthermore, the servo electric cylinders of the left and right motion units are connected to the control box; the control box drives and controls the servo electric cylinders of the left and right motion units to achieve synchronous reciprocating motion, and receives displacement pulse signal feedback from them to achieve fatigue reciprocating motion control.

[0010] Furthermore, the control box is characterized by having a built-in control motherboard and a switching power supply. The control motherboard includes: a main control chip circuit, a power supply circuit, an Ethernet communication circuit, a serial communication circuit, an input / output circuit, an AD acquisition circuit, an encoder acquisition circuit, and a dual-channel motor drive circuit.

[0011] Furthermore, the control box is connected to a computer via an Ethernet communication circuit.

[0012] Compared with the prior art, the advantages are: the equipment structure is simple and easy to manufacture, the system load holding is stable, the dual-path dynamic collaborative control is high, the force value accuracy is high, and it meets the technical requirements of various test specifications. Attached Figure Description

[0013] Figure 1 This is a top view of the structure of one embodiment of the present invention.

[0014] Figure 2 This is a side view of the structure of one embodiment of the present invention.

[0015] Figure 3 This is a partial structural diagram of one embodiment of the present invention.

[0016] Figure 4 This is a structural diagram of a support unit applying an embodiment of the present invention.

[0017] Figure 5 This is a structural diagram of the left / right fixed unit according to an embodiment of the present invention.

[0018] Figure 6 This is a structural diagram of the left / right motion unit according to an embodiment of the present invention.

[0019] In the diagram: 1. Frame; 2. Guardrail; 3. Left fixed unit; 4. Left moving unit; 5. Right moving unit; 6. Right fixed unit; 7. Support unit; 8. Wire under test. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] like Figure 1 and Figure 2 As shown, a pre-stretched fatigue testing machine for overhead power distribution lines includes: a frame 1, a guardrail 2, a left fixed unit 3, a left moving unit 4, a support unit 7, a right moving unit 5, a right fixed unit 6, and a control box (not shown). The frame 1 is 9m long, 0.7m wide, and 0.85m high, and is surrounded by the guardrail 2. Its interior is composed of the left fixed unit 3, the left moving unit 4, the support unit 7, the right moving unit 5, and the right fixed unit 6. The distance between the left fixed unit 3, the left moving unit 4, the support unit 7, the right moving unit 5, and the right fixed unit 6 is 2m.

[0022] The left fixing unit 3 and the right fixing unit 6 are composed of screws, nuts, force sensors and fixing rings, and are used to fix the wire 8 under test to both ends of the device; the left motion unit 3 and the right motion unit 7 are composed of servo cylinders and wire clamps, and are located in the middle of the left fixing unit 3, the right fixing unit 5 and the support unit 4, respectively, and are used to generate synchronous reciprocating motion excitation for the wire under test.

[0023] Furthermore, the wire under test 8 is installed on the device via the left fixing unit 3, the support unit 4, and the right fixing unit 5, and the left motion unit 3 and the right motion unit 7 apply synchronous reciprocating motion excitation to achieve fatigue control.

[0024] Furthermore, the force sensors of the left fixing unit 3 and the right fixing unit 5 are connected to the control box and are used to collect force value changes during the fatigue test of the device.

[0025] Furthermore, the servo electric cylinders of the left motion unit 3 and the right motion unit 7 are connected to the control box; the control box drives and controls the servo electric cylinders of the left motion unit 3 and the right motion unit 7 to achieve synchronous reciprocating motion, and receives displacement pulse signal feedback from them to achieve fatigue reciprocating motion control.

[0026] Furthermore, the support unit 4 supports the wire 8 under test via an insulator and a notch thereon.

[0027] Furthermore, the control box is characterized by having a built-in control motherboard and a switching power supply. The control motherboard includes: a main control chip circuit, a power supply circuit, an Ethernet communication circuit, a serial communication circuit, an input / output circuit, an AD acquisition circuit, an encoder acquisition circuit, and a dual-channel motor drive circuit.

[0028] Furthermore, the dual-motor drive circuit independently drives and controls the drive motors of the left motion unit 3 and the right motion unit 7.

[0029] like Figure 3 The diagram shows a partial three-dimensional rendering of a pre-stretched fatigue testing machine for overhead power lines, comprising a left fixed unit 3, a left moving unit 4, and a support unit 7. The right fixed unit 5 and the right moving unit 7 are symmetrically designed. The tested wire 8 is longer than 8m, and one end of it is connected and fixed to the device via a fixing ring of the left fixed unit 3. The force changes during the fatigue test are collected by the force sensor of the left fixed unit 3 through the control box. The left moving unit 4 is located between the left fixed unit 3 and the support unit 7, and is used to apply a reciprocating motion excitation to one side (left side) of the tested wire 8, while applying a synchronous excitation to the other side (right side). The synchronous drive control is completed by dual servo motors independently driven in the control box.

[0030] like Figures 4-6 As shown, a structural diagram of the support unit, left / right fixing unit, and left / right moving unit of a pre-stretched fatigue testing machine for overhead power distribution lines is provided; the support unit 7 includes a pad, an insulator, and a notch thereon to support and hold the wire 8 under test (see...). Figure 4 The specific structures of the left fixed unit 3 and the right fixed unit 6 are shown in (see...). Figure 5 The connection relationship of the screws, nuts, force sensor, and retaining ring included is as follows: one end of the force sensor is fixed to the end base by a combination of screws and nuts, and the other end is connected to the measured wire 8 by the retaining ring; the specific structure of the left motion unit 4 and the right motion unit 5 (see...) Figure 6It includes a servo electric cylinder and a wire clamp. The servo electric cylinder applies excitation to the wire under test 8 via the wire clamp to provide reciprocating motion, thereby achieving fatigue control.

[0031] The working process of this utility model is as follows: the wire to be tested is fixedly placed in the designated position of the device, and the force sensor, control box, computer, and servo cylinder are connected to complete the preliminary preparation work for the fatigue test. The servo cylinder power is turned on, and the control box and computer are turned on. After the equipment passes the self-test, it is ready to enter the fatigue test process.

[0032] During the test, the transverse loading on both sides (left motion unit 4 and right motion unit 7) reciprocates synchronously, so that the peak-to-peak swing angle of the insulator in the support unit 4 of the tested wire 8 is 10°. The test frequency can be set from 0.5Hz to 1.0Hz. The test ends when the number of cycles reaches 10,000.

[0033] The final result of the test is determined by removing the binding wires and inspecting the surface of the conductors after the fatigue test. If the binding wires with insulation are found to have no metal substrate or the binding wires without insulation are not damaged, then the tested wires have passed the fatigue test.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above embodiments illustrate only one implementation of this utility model, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A fatigue testing machine for pre-twisted binding wires used in overhead power distribution lines, characterized in that, include: The device comprises a frame, guardrail, left fixed unit, left moving unit, support unit, right moving unit, right fixed unit, and control box. The left and right fixed units, each consisting of screws, nuts, force sensors, and retaining rings, are used to fix the wire under test to both ends of the device. The left and right moving units, each consisting of a servo cylinder and a clamp, are located in the middle of the left and right fixed units and the support unit, respectively, and are used to generate synchronous reciprocating motion excitation for the wire under test. The support unit supports the wire under test via insulators and their recesses.

2. The fatigue testing machine device for pre-twisted binding wires for overhead power distribution lines according to claim 1, characterized in that, The wire under test is mounted on the device via a left fixing unit, a support unit, and a right fixing unit, and is subjected to synchronous reciprocating motion excitation by the left and right motion units to achieve fatigue control.

3. The fatigue testing machine device for pre-twisted binding wires for overhead power distribution lines according to claim 1, characterized in that, The force sensors of the left and right fixed units are connected to the control box and are used to collect force value changes during the fatigue test of the device.

4. The fatigue testing machine device for pre-twisted binding wires for overhead power distribution lines according to claim 1, characterized in that, The servo electric cylinders of the left and right motion units are connected to the control box; the control box drives and controls the servo electric cylinders of the left and right motion units to achieve synchronous reciprocating motion, and receives displacement pulse signal feedback from them to achieve fatigue reciprocating motion control.

5. The fatigue testing machine device for pre-twisted binding wires for overhead power distribution lines according to claim 1, characterized in that, The control box contains a control motherboard and a switching power supply. The control motherboard includes: a main control chip circuit, a power supply circuit, an Ethernet communication circuit, a serial communication circuit, an input / output circuit, an AD acquisition circuit, an encoder acquisition circuit, and a dual-channel motor drive circuit.

6. The fatigue testing machine device for pre-twisted binding wires for overhead power distribution lines according to claim 1, characterized in that, The control box is connected to the computer via an Ethernet communication circuit.

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