An automatic wiring fitting for live wiring of distribution network lines

Abstract

An automatic wiring hardware for live wiring of distribution network lines belongs to the field of connection devices. It includes a copper insert, an insulating sheet, a lower locking wire block, an upper locking wire block, a torque nut, a hardware upper hook, a hardware shaft and a locking torsion spring arranged in the hardware shell; wherein, a copper insert is arranged in the hardware shell, and a metal screw is arranged through the copper insert; a torque nut is arranged at the lower end of the screw; a lower locking wire block and an upper locking wire block are arranged in sequence on the upper end of the screw so as to slide up and down, a pair of hardware shafts are symmetrically arranged at the upper end of the hardware shell, and a hardware upper hook and a locking torsion spring are set on each hardware shaft; an insulating sheet is arranged between the upper end of the screw and the lower locking wire block. It realizes the consistency of construction quality through the rotation and breaking of the torque nut, can realize the "automatic tightening" function of the wiring fastening hardware, greatly improves the safety of live line operation, and can replace the operation mode of manually contacting the live hardware during live operation.

Description

Technical Field

[0001] The invention belongs to the field of electrical connection devices, and in particular relates to a wiring fastening hardware device for overhead lines. Background Art

[0002] The lines that directly supply power to users are called distribution lines, and the network composed of distribution lines is called distribution network, abbreviated as distribution network, or distribution network.

[0003] Distribution lines are important facilities in the power system that are responsible for transmitting electricity. Transmission lines are geographically distributed over a wide area, are huge in number and variety, and their operating conditions change rapidly.

[0004] With the development of the times, people have higher and higher requirements for electricity. Strengthening the transformation and construction management of distribution network lines is of great significance to the safe operation of distribution network lines.

[0005] In recent years, in order to cooperate with a series of measures such as increasing the intensity of power grid transformation, optimizing the business environment, and improving the management of distribution network non-stop operations, non-stop operations have become an important part of the distribution network operation management and maintenance system.

[0006] Transmission lines are important facilities in the power system that transmit electricity. Effective and efficient operation and maintenance are the key to ensuring the safe and reliable operation of the power system. In addition, transmission lines are geographically distributed over a wide area, are huge in number and variety, and their operating status changes rapidly, so the construction workload is correspondingly huge. During the operation of the various connection fittings of the line, in the environment of ensuring the reduction of power outage rate (power supply departments in many cities have made a service commitment that the power outage time will not exceed XX minutes), the popularity of live working projects will increase significantly, and the corresponding workload will also be greater.

[0007] As far as we know, most of the existing line fittings are directly touched by front-line construction workers with bare hands wearing insulating gloves, which poses a risk of accidental contact by construction workers. According to statistics, a large part of live-line construction is related to the operating mode in which live-line workers must touch live-line fittings.

[0008] At present, in the context of reducing power outage rates, improving power supply reliability, and increasing requirements for live work, it is urgent to research and develop a set of live work adapter hardware that is easy to carry, efficient in construction, safe and stable, and has strong adaptability to the construction environment.

[0009] The invention patent application with the application publication date of July 5, 2019 and the application publication number of CN 109980381 A discloses an electrical connection hardware and a method thereof, comprising: a wire clamp, which is provided with a first groove; a hardware body, whose inner wall is provided with a slide groove for the wire clamp to slide, and a hardware base at the bottom of the hardware body is provided with a second groove for placing wires (also called live wires) and leads (also called wires to be connected) and matching the first groove; a bolt, which is inserted into the bolt hole on the hardware base and the bolt hole on the wire clamp from bottom to top in sequence; a spring, which is sleeved on the outside of the bolt, and is compressed by tightening the bolt to control the distance between the hardware base and the wire clamp, and the spring is pressed between the wire clamp and the hardware base. This technical solution can solve the problem that when working on live distribution lines, the robot arm of the live robot can easily connect the overhead line and the lead wire, and after the connection, the robot arm can be separated from the connection hardware, so that the wiring fastening hardware (referred to as "hardware") replaces the existing wire connection clamp; it has a certain mechanical strength and current conduction capacity to ensure that the overhead line can operate safely for a long time after the robot performs live connection. This technical solution requires a live robot to operate, and the whole set of live operation system requires many supporting facilities and is large in size, which is not conducive to the implementation of live wiring operations on 10KV overhead lines in cities. It has high requirements for the traffic conditions or construction environment around the construction site, the number of people involved in the construction, etc. For the grassroots live operation teams, which usually have only 2 to 3 people in each group, this technical solution is obviously not applicable.

[0010] In order to ensure the safety of live working and improve the efficiency of live working, domestic and foreign scientific researchers have conducted in-depth discussions and research from different aspects. Although these studies have solved the safety problems of workers in live working to a certain extent, the research on corresponding small and convenient fastening hardware is still not comprehensive enough and needs to be improved. Summary of the invention

[0011] The technical problem to be solved by the present invention is to provide an automatic wiring fitting for live wiring of distribution network lines. It adopts a live working mode of automatic connection and automatic tightening, which eliminates the operating mode in which live working personnel must touch the live fittings; the use of the fittings will provide convenience for line construction and installation, improve the speed and quality of construction, and at the same time, ensure the personal safety of construction personnel during the construction process, so that construction personnel can achieve hands-free and fully insulated operation, which can be applied to overhead transmission line splicing, and achieve efficient, safe, stable and consistent construction quality of live splicing fittings for distribution network lines; at the same time, personal injury incidents caused by "accidental touch" or induced arcs are eliminated during live working.

[0012] The technical solution of the present invention is to provide an automatic wiring fitting for live wiring of distribution network lines, which is characterized by:

[0013] The hardware includes a copper insert, an insulating sheet, a lower locking wire block, an upper locking wire block, a torque nut, a hardware upper hook, a hardware shaft and a locking torsion spring arranged in a hardware housing;

[0014] Among them, a copper insert is arranged in the outer shell of the hardware, and a metal screw is arranged through the copper insert; a torque nut is arranged at the lower end of the screw; at the upper end of the screw, a lower locking wire block and an upper locking wire block are arranged in sequence so as to be slidable up and down, and at the upper end of the hardware shell, a pair of hardware shafts are symmetrically arranged, and a hardware upper hook and a locking torsion spring are set on each hardware shaft; an insulating sheet is arranged between the upper end of the screw and the lower locking wire block.

[0015] Furthermore, a torque motor is arranged below the hardware; the torque motor and the torque nut are arranged coaxially; when the torque motor is started, the torque motor drives the torque nut to rotate, and then drives the screw arranged in the copper insert to rotate, pushing the lower locking wire block and the upper locking wire block that clamp the bare wire end of the cable to be connected to move upward, and when the pressure or clamping force of the upper hook of the hardware and the upper locking wire block on the bare wire segment of the live cable reaches the set value, the torque nut is disconnected and the torque motor stops rotating at the same time, thereby realizing the "automatic tightening" function of the wiring fastening hardware.

[0016] Specifically, the torque nut is made of insulating material to isolate the possibility of electrical connection between the screw and the torque motor.

[0017] Specifically, the hardware shell is made of insulating material.

[0018] Furthermore, the automatic wiring fittings replace the live wiring mode in which the operator must touch the live wiring fittings through the live wiring operation mode of "automatic connection" between the cable to be connected and the live cable and "automatic tightening" of the wiring fastening fittings.

[0019] The use of the automatic wiring hardware described in the technical solution can achieve a convenient, stable and safe construction mode for live wiring operations, and can ensure the consistency of construction quality, so that the hardware will not loosen, the line runs stably, and the construction does not need to touch the line with bare hands, thereby ensuring the safety of construction personnel.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. This technical solution aims to solve the problems that the line hardware connection needs to be done by hand during the current line construction process, and there is a lack of personal protection for construction workers. It realizes a convenient, stable and safe construction mode for live wiring operations, and can ensure the stability of construction quality, so that the hardware will not be loose, the line runs stably, and the construction does not need to touch the line with bare hands, thus ensuring the safety of construction workers;

[0022] 2. This technical solution can be applied to the live bonding operation of overhead transmission lines, achieving high efficiency, safety and stability in the live bonding of distribution network lines, and ensuring the consistency of construction quality;

[0023] 3. The adoption of this technical solution can greatly improve the safety of live line operations and the consistency of construction quality, thereby replacing the operating mode of manually touching live hardware during live line operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the automatic wiring fitting of the present invention.

[0025] In the figure, 3-1 is a bare wire segment of a live cable, 6 is a hardware housing, 601 is a copper insert, 602 is an insulating sheet, 603 is a lower locking wire block, 604 is an upper locking wire block, 605 is a torque nut, 606 is a hardware upper hook, 607 is a hardware shaft, 608 is a locking torsion spring, and 10 is a bare wire end of the cable to be connected. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown in , the hardware described in the technical solution includes a copper insert 601, an insulating sheet 602, a lower locking wire block 603, an upper locking wire block 604, a torque nut 605, a hardware upper hook 606, a hardware shaft 607 and a locking torsion spring 608 arranged in a hardware housing 6;

[0028] Specifically, a copper insert (actually a copper nut structure) is provided in the outer shell of the hardware, and a metal screw is arranged through the copper insert; a torque nut is provided at the lower end of the screw, and the torque nut is made of insulating material to isolate the possibility of electrical connection between the screw and the torque motor; at the upper end of the screw, a lower locking wire block and an upper locking wire block are slidably arranged in sequence up and down, and at the upper end of the hardware shell, a pair of hardware shafts are symmetrically arranged, and a hardware upper hook and a locking torsion spring are suitably arranged on each hardware shaft; an insulating sheet is provided between the upper end of the screw and the lower locking wire block to isolate the possibility of electrical connection between the upper end of the screw and the lower locking wire block.

[0029] Furthermore, a torque motor (not shown in the figure) is arranged below the hardware; the torque motor and the torque nut are arranged coaxially; when the torque motor is started, the torque motor drives the torque nut to rotate, and then drives the screw arranged in the copper insert to rotate, pushing the lower locking wire block and the upper locking wire block that clamp the bare wire end of the cable to be connected to move upward, and when the pressure or clamping force of the upper hook of the hardware and the upper locking wire block on the bare wire segment of the live cable reaches the set value, the torque nut is disconnected and the torque motor stops rotating at the same time, thereby realizing the "automatic tightening" function of the wiring fastening hardware.

[0030] Specifically, the torque nut is made of insulating material to isolate the possibility of electrical connection between the screw and the torque motor.

[0031] Specifically, the hardware shell is made of insulating material.

[0032] During actual live work, first fix the bare wire end 10 of the cable to be connected (the cable to be connected is in a non-energized state) on the hardware 6 (crimping or screw fixing can be used), and then insert the hardware into the limit frame on the automatic wiring device. A lock tongue hole of the electromagnetic lock is provided at the lower part of the hardware housing. Under the action of the electromagnetic lock (the electromagnetic lock is in a power-off state at this time, and its inclined lock tongue extends out), the hardware is fixed on the limit frame.

[0033] As the drive-control module in the automatic wiring device rises to the bottom of the bare wire segment of the live cable, the bare wire segment 3-1 of the live cable is embedded between the upper hook 606 of the hardware and the locking wire block 604 at the upper end of the hardware; due to the limitation of the locking torsion spring 608, the upper hook 606 of the hardware can only be flipped downward and cannot be rotated upward (also called a one-way elastic rotatable structure) to prevent the bare wire segment of the live cable from escaping from the hardware.

[0034] At the same time, since the upper hook of the hardware in the hardware adopts a unidirectional elastic rotatable structure, the "sparking" phenomenon is avoided when the hardware contacts the exposed section of the live cable.

[0035] When the drive-control module in the automatic wiring device moves to the uppermost position of the movable range, the bare wire segment of the live cable is reliably embedded in the hardware, thereby realizing the "automatic connection" function between the cable to be connected and the live cable.

[0036] Start the torque motor in the automatic wiring device drive-control module (located below the limit frame, the torque motor and the limit frame are coaxially arranged), the torque motor drives the torque nut 605 to rotate, and then drives the screw set in the copper insert 601 to rotate (the copper insert and the screw constitute a screw-nut motion pair), pushing the lower locking block 603 and the upper locking block 604 that clamp the bare wire end of the cable to be connected to move upward, when the pressure (or clamping force) of the hardware upper hook 606 and the upper locking block 604 on the bare wire segment of the live cable reaches the set value, the torque nut 605 is disconnected, and the torque motor stops rotating at the same time, thereby realizing the "automatic tightening" function of the wiring fastening hardware.

[0037] The torque nut structure used in this technical solution can maintain the consistency of construction standards (cable clamping force), avoid the difference in hardware clamping force caused by the arm strength of construction workers, and help standardize construction operations. At the same time, since the hardware clamping force is uniform and constant, it can also avoid the heating phenomenon caused by the clamping force not meeting the standard between the hardware and the live cable.

[0038] In the present technical solution, the movement of the lower locking block 603 and the upper locking block 604 of the hardware is achieved by screws set in the copper insert, which also implies another function: when it is necessary to release the physical connection between the live cable and the cable to be connected, a socket wrench can be used to rotate the screw in the opposite direction, so that the cable to be connected can be separated from the hardware 6, realizing the "removable" function of the cable to be connected.

[0039] By setting or adjusting different arc curves between the lower locking wire block 603 and the upper locking wire block 604, and between the upper locking wire block 604 and the upper hook 606 of the hardware, the wiring and fastening requirements of wires with different diameters can be met.

[0040] Through the implementation of this technical solution, the live wiring operation mode of "automatic connection" between the cable to be connected and the live cable and "automatic tightening" of the wiring fastening hardware is realized, which can completely replace the operation mode in which the live working personnel must touch the live hardware.

[0041] Since the use of wireless remote control to start the torque motor and the use of limit switches to limit the moving range of the moving parts are both existing technologies, their specific implementation methods, control principles or control circuits will not be described here.

[0042] By adopting this technical solution, in addition to stripping the insulation section of the live cable to form a bare wire segment (which can be done using an insulating operating rod with a stripping knife), the live splicing, live wiring and automatic tightening processes of the entire line hardware can be completed automatically, without the need for operators to make live contact or live operations, so that construction personnel can achieve hands-free and fully insulated operations, achieving efficient, safe, stable and consistent construction quality of live splicing hardware for distribution network lines; at the same time, personal injury incidents caused by "accidental touch" or induced arcs can be effectively prevented during live operations.

[0043] The invention can be widely used in the field of designing and manufacturing overhead line connection fittings.

Claims

1. An automatic wiring fitting for live wiring of distribution network lines, characterized by: The hardware includes a copper insert, an insulating sheet, a lower locking wire block, an upper locking wire block, a torque nut, a hardware upper hook, a hardware shaft and a locking torsion spring arranged in a hardware housing; Among them, a copper insert is arranged in the outer shell of the hardware, and a metal screw is arranged through the copper insert; a torque nut is arranged at the lower end of the screw; at the upper end of the screw, a lower locking wire block and an upper locking wire block are arranged in sequence so as to slide up and down, and at the upper end of the hardware shell, a pair of hardware shafts are symmetrically arranged, and a hardware upper hook and a locking torsion spring are set on each hardware shaft; the bare wire segment of the live cable is embedded between the hardware upper hook and the upper locking wire block at the upper end of the hardware; due to the limitation of the locking torsion spring, the hardware upper hook can only be turned downward and cannot be rotated upward, forming a unidirectional elastic rotatable structure to prevent the bare wire segment of the live cable from escaping from the hardware; An insulating sheet is provided between the upper end of the screw and the lower locking wire block to isolate the possibility of electrical connection between the upper end of the screw and the lower locking wire block; A torque motor is arranged below the hardware; the torque motor and the torque nut are arranged coaxially; When the torque motor is started, the torque motor drives the torque nut to rotate, and then drives the screw set in the copper insert to rotate, pushing the lower locking block and the upper locking block that clamp the bare wire end of the cable to be connected to move upward. When the pressure or clamping force of the upper hook of the hardware and the upper locking block on the bare wire segment of the live cable reaches the set value, the torque nut is disconnected and the torque motor stops rotating at the same time, thereby realizing the "automatic tightening" function of the wiring fastening hardware; The automatic wiring fittings for live wiring of distribution network lines adopt a live working mode of automatic connection and automatic tightening, which improves the safety of live line working and the consistency of construction quality, thereby replacing the operating mode of manual contact with live fittings during live working.

2. The automatic wiring fitting for live wiring of distribution network lines according to claim 1, characterized in that The torque nut is made of insulating material to isolate the possibility of electrical connection between the screw and the torque motor.

3. The automatic wiring fitting for live wiring of distribution network lines according to claim 1, characterized in that The hardware shell is made of insulating material.

4. The automatic wiring fitting for live wiring of distribution network lines according to claim 1, characterized in that The automatic wiring fittings replace the live wiring mode in which the operator must touch the live wiring fittings through the live wiring operation mode of "automatic connection" between the cable to be connected and the live cable and "automatic tightening" of the wiring fastening fittings.

5. The automatic wiring fitting for live wiring of distribution network lines according to claim 1, characterized in that By adopting the automatic wiring fittings, a convenient, stable and safe construction mode for live wiring operations can be achieved, and the consistency of construction quality can be guaranteed, so that the fittings will not be loose, the line will run stably, and the construction does not need to touch the line with bare hands, thereby ensuring the safety of construction personnel.

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