CN114759488A - Equipotential electric field entering method for high-voltage transmission line - Google Patents

Abstract

The patent discloses a method for enabling high-voltage transmission lines to enter an electric field at equal potential, wherein a lifting unlocking mechanism is arranged on a pulley hook, the lifting unlocking mechanism is unlocked when a lifting ring (1) is lifted, a guide rope (8) and the pulley hook are lifted to a cross arm (13) through a lifting hook (16) at the lower part of an unmanned aerial vehicle (17), and the hook of the pulley hook is hung on the cross arm (13); the climbing rope (9) is lifted and wound on a pulley (7) of a pulley hook through a guide rope (8), the climbing rope (9) is connected with a climbing vehicle (15), and an equipotential operator enters an electric field through the climbing vehicle (15); the advantages are that: 1) the working intensity of tower climbing personnel is low, and the working efficiency is high; 2) the hook on the cross arm is convenient to unhook, the unmanned aerial vehicle is simple to execute and operate, and the working efficiency is high; 3) the unmanned aerial vehicle has small lifting force, and an electric rotor helicopter with good balance can be selected; 4) provides a convenient and rapid electric field feeding mode.

Description

Equipotential electric field entering method for high-voltage transmission line

Technical Field

The patent relates to a maintenance and overhaul operation method for a high-voltage transmission line, in particular to a method for enabling the high-voltage transmission line to enter an electric field at the same potential.

Background

In order to ensure normal power supply, high-voltage transmission lines are generally overhauled and maintained in an electrified way; in the process of maintenance, electric power maintainers need to enter an electric field in an equipotential manner; the existing live working equipotential entering electric field mode is: 1) the electric field is hung on a lead or a cross arm through an insulating flexible ladder, and equipotential operators enter the electric field from the ground through climbing the insulating flexible ladder; 2) arranging the insulating hard ladder vertically or obliquely to the horizontal lead, and enabling an equipotential operator to enter an electric field along the riding type of the hard ladder; 3) climbing the iron tower, and entering an electric field from a cross arm along an insulator string; 4) other auxiliary personnel climb the tower, and a hanging basket, a hanging chair and equipotential personnel are sent into an electric field on the iron tower through an insulating rope; 5) throwing an insulating rope through a lead by an unmanned aerial vehicle rope throwing method, and lifting equipotential personnel to an electric field through the insulating rope; the disadvantages of the above method are: the requirement on an insulating tool is high, the requirement on physical strength of operators is high, the live working time is long, and the working efficiency is low; the rope throwing method is only suitable for operation in a lead area, and the difficulty of entering and exiting an electric field is high.

Disclosure of Invention

The purpose of this patent is exactly to design a high tension transmission line equipotential and get into electric field method, hangs pulley couple and guide rope on the iron tower cross arm safely, conveniently, accurately through unmanned aerial vehicle, and rethread guide rope pulling climbing rope makes things convenient for the maintainer to climb the tower and get into the electric field through insulating climbing rope is automatic.

The technical scheme of this patent is: a method for enabling high-voltage transmission lines to enter an electric field at equal potentials comprises the following steps:

step 1, winding the head end of an insulated guide rope around a pulley of a pulley hook on the ground, and winding the middle part of the guide rope on the pulley of the pulley hook; connecting the tail end of the guide rope with the head end of the insulating climbing rope; the lengths of the guide rope and the climbing rope are respectively more than twice of the height of the cross arm from the ground, and the tail end of the climbing rope is connected with a climbing vehicle;

step 2, hanging a lifting hook at the lower part of the unmanned aerial vehicle on a lifting ring at the upper end of a pulley hook, starting the unmanned aerial vehicle, and opening a hook normally-closed self-locking rod of the pulley hook under the self-weight action of the pulley hook and a guide rope by a lifting unlocking mechanism of the pulley hook when the unmanned aerial vehicle ascends so as to open a hook opening; the unmanned aerial vehicle lifts the pulley hook and the guide rope to the cross arm, and enables the hook to be clamped on the cross arm;

step 3, unhooking a lifting hook of the unmanned aerial vehicle and a lifting ring of a pulley hook, locking a self-locking rod of the pulley hook under the action of a torsion spring, and closing an opening of the hook;

step 4, pulling the head end of the guide rope by a person under the tower to enable the head end of the climbing rope to wind around the pulley along with the guide rope and then fall back to the ground, and fixing the head end of the climbing rope;

step 5, riding the equipotential operators on a climbing vehicle, lifting the climbing vehicle to the cross arm along the climbing rope, and enabling the equipotential operators to enter the conducting wire part along the insulator string; or the climbing vehicle is lifted to the position of the lead along the climbing rope, and the equipotential operator directly enters the position of the lead from the climbing vehicle; after the construction is finished in the electric field area, the electric field area returns to the ground through a climbing vehicle according to the original road;

step 6, loosening the head end of the climbing rope from the ground fixing point, and releasing the guide rope to enable the climbing rope to fall back to the ground;

step 7, suspending the unmanned aerial vehicle above the pulley hook on the cross arm, and hanging the hook on a hanging ring at the upper end of the pulley hook; the unmanned aerial vehicle lifts the lifting ring, the lifting unlocking mechanism of the pulley hook acts, the hook normally-closed self-locking rod is opened, the hook opening is opened, the lifting ring is continuously lifted, and the pulley hook is unhooked from the cross arm; then the pulley hook falls back to the ground through the unmanned aerial vehicle;

and 8, unhooking the lifting hook of the unmanned aerial vehicle and the lifting ring of the pulley hook, and finishing the maintenance task.

Furthermore, the lifting unlocking mechanism is composed of a hanging ring, a connecting rod, an unlocking rope and a self-locking rod which are sequentially connected with the pulley hook, the connecting rod is dynamically connected with the connecting part of the hook of the pulley hook, and the connecting rod can move up and down relative to the connecting part; the lower end of the connecting rod is connected with the self-locking rod through an unlocking rope, the self-locking rod rotates upwards when the lifting ring is lifted through a lifting hook at the lower part of the unmanned aerial vehicle, and an opening of the hook is opened;

furthermore, the upper end of the unlocking rope is connected with a threaded joint, the lower end of the connecting rod is provided with a threaded hole matched with the threaded joint, the upper end of the unlocking rope is connected with the lower end of the connecting rod through threads, and the effective working length of the unlocking rope is adjusted through screwing in the length of the threads;

furthermore, the connecting part comprises a lug arranged on the upper end face of the hook and a cylinder with the lower end connected to the lug, the open end of the cylinder faces downwards, a through hole is formed in the center of the upper end face of the cylinder, and the lower end of the cylinder is connected to the upper end of the hook through the lug; the lower end of the connecting rod is provided with a limiting boss, and the diameter of the limiting boss is larger than that of the through hole; the limiting boss of the connecting rod is arranged in the cylinder, the upper end of the connecting rod extends out of the through hole at the upper end of the cylinder, and the limiting boss can move up and down in the cylinder;

furthermore, the hook of the pulley hook is of a plate-shaped structure made of a light plate material, and the hook shape of the hook is of a square structure matched with the width of angle steel of the cross arm;

further, a connecting part is arranged at the top end of the hook of the pulley hook, and a pulley is connected to the lower end of the handle part of the hook; a normally closed self-locking rod is arranged at the opening end of the hook, and one end of the self-locking rod is elastically hinged to the handle part of the hook through a torsion spring; a limiting block is arranged on a handle part at the lower end of the hook and is positioned below the self-locking rod, and the self-locking rod is downwards clamped on the limiting block under the action of the spring force of the torsion spring, so that the self-locking rod is in a normally closed self-locking state;

furthermore, the connection point of the connecting part and the upper end of the pulley hook is the intersection point of the gravity center line of the pulley hook and the plane of the top end of the hook when the top end of the hook is in a horizontal state;

furthermore, the pulley of the pulley hook is connected to the lower end of the hook handle part of the pulley hook through a cross hinge.

The advantage of this patent is:

1) the pulley hook is directly hung on the cross arm by the aid of the unmanned aerial vehicle, and a maintainer is automatically lifted to the position of the cross arm through an insulating rope, so that physical force required by manual tower climbing is eliminated, the working strength of the tower climbing staff is low, and the working efficiency is high;

2) because the hook has mandatory safety requirements in the power construction process, the high-altitude hook needs to be provided with a self-locking rod, and the self-locking rod needs to be safely locked after the hook is hooked so as to avoid safety accidents caused by unhooking of the hook; the self-locking rod is inconvenient to operate and control at high altitude through the unmanned aerial vehicle, and particularly in a limited space on an iron tower, the requirement on the unmanned aerial vehicle is higher, and the unmanned aerial vehicle cannot operate; the lifting unlocking mechanism is combined with the characteristics of the unmanned aerial vehicle, the operation problem of hooking the unmanned aerial vehicle on the cross arm of the iron tower is solved, the hooking and unhooking operation is convenient, and the structure is simple;

3) the pulley hook and the guide rope are lifted to the cross arm through the unmanned aerial vehicle, and the climbing rope is lifted to the pulley through the guide rope, so that the weight of the guide rope and the pulley hook is small, the lifting force required by the unmanned aerial vehicle is small, an electric rotary wing type unmanned aerial vehicle can be selected, and the unmanned aerial vehicle is good in operability and balance;

4) the electric field entering device can provide various electric field entering modes, enter the electric field near the cross arm through the climbing rope, enter the electric field from the cross arm through the insulating sub-string, and also lift the equipotential operating personnel near the lead through the climbing rope, so that the equipotential operating personnel directly enter the electric field from the insulating climbing rope.

Drawings

Fig. 1 is a schematic view of an equipotential entrance electric field of a high-voltage transmission line in the patent;

FIG. 2 is a schematic view of the connection of a lifting ring, a pulley hook and an unlocking rope;

in the figure: 1-a hoisting ring; 2-a connecting rod; 3-cylinder; 4-hooking; 5-self-locking lever; 6-a limiting block; 7-a pulley; 8-guiding a rope; 9-climbing rope; 10-torsion spring; 11-unlocking the rope; 12-a guide tube; 13-cross arm; 14-a threaded joint; 15-climbing vehicle; 16-a hook; 17-unmanned plane.

Detailed Description

The following detailed description of the present patent refers to the accompanying drawings and detailed description.

The method for enabling the high-voltage transmission line to enter the electric field at the equal potential comprises the following steps:

step 1, winding the head end of a guide rope 8 made of insulating materials around a pulley 7 of a pulley hook on the ground, wherein the length of the guide rope 8 is more than twice of the height of a cross arm 13 for hanging the hook on an iron tower, and a worker pulls the guide rope 8 on the ground to wind the middle part of the guide rope 8 on the pulley 7 of the pulley hook; the tail end of a guide rope 8 is connected with the head end of a climbing rope 9 made of insulating materials, the length of the climbing rope 9 is more than twice of the height of a cross arm 13 for hanging a hook on an iron tower, and the tail end of the climbing rope 9 is connected with a climbing vehicle 15;

the length of the guide rope 8 is greater than twice of the height of the cross arm 13 from the ground, so that when the unmanned aerial vehicle 17 lifts the pulley hook and the guide rope 8, when the pulley hook reaches the position close to the position of the cross arm 13, the head end and the tail end of the guide rope 8 can be located at the ground position, operation of ground personnel is facilitated, meanwhile, the climbing rope 9 is also located on the ground, although the tail end of the guide rope 8 is connected with the head end of the climbing rope 9, the guide rope 8 does not bear the weight of the climbing rope 9, extra tension cannot be generated on the unmanned aerial vehicle 17 to lift the pulley hook and the guide rope 8, and therefore the lifting force required by the unmanned aerial vehicle 17 to lift the pulley hook is reduced; after climbing rope 9 is lifted by guide rope 8 and wound on pulley 7, the head end of climbing rope 9 is fixed behind ground or iron tower bottom, and the end-to-end connection initial position of climbing rope 9 is climbing car 15 on the ground, so the length of climbing rope 9 must also be greater than the twice of cross arm 13 apart from the ground height.

Step 2, hanging a lifting hook 16 at the lower part of an unmanned aerial vehicle 17 on a lifting ring 1 at the upper end of a pulley hook, starting the unmanned aerial vehicle 17, enabling a normally-closed self-locking rod 5 of a hook 4 to overcome the spring force of a torsion spring 10 to rotate upwards under the self-weight action of the pulley hook and a guide rope 8 when the unmanned aerial vehicle 17 ascends, and unlocking and opening the self-locking rod 5, so that a hook opening is opened; the unmanned aerial vehicle 17 continues to rise to lift the pulley hook and the guide rope 8 to the cross arm 13, and the hook 4 of the pulley hook is clamped on the cross arm 13. The unmanned aerial vehicle 17 adopts a rotor type electrically-driven unmanned aerial vehicle, has small volume and good balance, and can easily hang the hook 4 on the angle iron of the cross arm 13 at high altitude.

Step 3, operating the unmanned aerial vehicle 17, lowering the height of the unmanned aerial vehicle 17, unhooking a lifting hook 16 of the unmanned aerial vehicle 17 and a lifting ring 1 of a pulley hook, after unhooking, locking a normally-closed self-locking rod 5 of the pulley hook under the action of a torsion spring 10, and keeping the pulley hook in a normally-closed state, wherein an opening of a hook 4 is closed; at the moment, the hook 4 is hung on the cross arm 13 and cannot fall off from the cross arm 13 due to the protection of the normally closed self-locking rod 5 at the opening of the hook, so that the safety protection effect is achieved.

Step 4, a person under the tower pulls the head end of the guide rope 8 to enable the head end of the climbing rope 9 to wind around the pulley 7 along with the guide rope 8 and then fall back to the ground, and then the head end of the climbing rope 9 is fixed on the ground; the fixing mode is various, and the fixing device can be directly fixed on the lower part of an iron tower; or can be directly connected to a winching machine according to the requirement, and the winching machine is used for pulling the climbing rope 9 to lift the climbing vehicle 15.

Step 5, after riding on the climbing vehicle 15, the equipotential operating personnel start the climbing vehicle 15, the climbing vehicle 15 is lifted to the cross arm 13 along the climbing rope 9, and the equipotential operating personnel enter the wire part along the insulator string through the cross arm 13 so as to safely enter an electric field area; or the climbing vehicle 15 is lifted to the position of the lead along the climbing rope 9, and the equipotential operator directly enters the position of the lead from the climbing vehicle 15, so as to safely enter an electric field area; after the construction is completed in the electric field area, the equipotential operating personnel returns to the ground through the climbing vehicle 15 according to the original path;

step 6, loosening the head end of the climbing rope 9 from the ground fixed point, and releasing the guide rope 8 to enable the climbing rope 9 to fall back to the ground;

step 7, starting the unmanned aerial vehicle 17, enabling the unmanned aerial vehicle 17 to suspend above the pulley hook on the cross arm 13, and enabling a lifting hook 16 at the lower part of the unmanned aerial vehicle 17 to be hung on a lifting ring 1 at the upper end of the pulley hook; then the unmanned aerial vehicle 17 is operated to ascend, the lifting ring 1 is lifted, the lifting unlocking mechanism of the pulley hook opens the normally closed self-locking rod 5 of the hook 4 under the self-weight action of the pulley hook and the guide rope 8, so that the opening of the hook 4 is opened, the lifting ring 1 is continuously lifted, and the hook 4 is unhooked from the cross arm 13; then the pulley hook falls back to the ground through the unmanned aerial vehicle 17;

8, unhooking the lifting hook 16 of the unmanned aerial vehicle 17 from the lifting ring 1, and completing the maintenance task;

as shown in fig. 1, the pulley hook comprises a hook 4 arranged at the upper part of the hook and a pulley 7 connected to the lower end of the handle part of the hook, the hook 4 is used for being clamped on the angle steel of a cross arm 13 on an iron tower through the hook part, the pulley 7 is used for connecting a climbing rope 9 and a guide rope 8, a climbing vehicle 15 can be arranged on the climbing rope 9, the climbing vehicle 15 can be driven by electric power to automatically climb along the climbing rope 9, and the climbing vehicle can also be connected to the climbing rope 9 and lifted by winching. The equipotential operating personnel take the climbing vehicle 15, automatically climb through the climbing vehicle 15 or lift the climbing vehicle 15 to the cross arm 13 through winching, and then enter the electric field area from the cross arm 13; the hook 4 of the pulley hook is a plate-shaped structure made of a light plate material, the hook shape of the hook 4 is a square structure matched with the width of angle steel of a cross arm 13 on an iron tower, for the high-voltage transmission line iron tower, the cross arm 13 generally adopts a standard 12.5-grade angle steel section, the width of the cross arm angle steel is 125 mm, the size of an opening of the hook 4 is about 135-150 mm for the convenience of hooking an unmanned aerial vehicle at high altitude, and the hook 4 is fixed after being hung on the cross arm 13 and cannot swing back and forth along the cross arm; the main body materials of the hook 4 and the bracket of the pulley 7 are aluminum alloy or titanium alloy, wherein LY12 is selected as the aluminum alloy, and TC4 is selected as the titanium alloy; the rotating wheel of the pulley 7 is made of nylon or other light, insulating and wear-resistant materials.

The upper end of the hook 4 is provided with a connecting part, the lower end of the handle part of the hook 4 is connected with a pulley 7, the hanging ring 1 is connected with the connecting part through a connecting rod 2, and the pulley 7 is connected with the lower end of the handle part of the hook 4 through a cross hinge.

As shown in fig. 2, the connecting part comprises a lug arranged on the upper end surface of the hook 4 and a cylinder 3 with the lower end connected on the lug, the open end of the cylinder 3 faces downwards, and a through hole is arranged in the center of the upper end surface of the cylinder 3; a radially through groove is formed in the pipe wall of the lower end face of the cylinder 3; the lug is a plate-shaped bulge on the upper end face of the hook 4 and is integrated with the hook 4 into a whole; the lug at the upper end of the hook 4 is inserted into the groove on the lower end surface of the cylinder 3, corresponding connecting holes are respectively arranged on the center of the lug and two side walls of the groove at the lower end of the cylinder 3, and a connecting screw passes through the connecting hole on the lug and the connecting hole on the side wall at the lower end of the cylinder, so that the lower end of the cylinder 3 and the lug at the upper end of the hook 4 are fixedly connected through threads to form a connecting part of the hook 4. The connecting point of the connecting part 2 and the upper end of the hook 4, namely the position of the lug on the upper end surface of the hook 4 is the intersection point of the gravity center line of the pulley hook and the plane of the top end of the hook when the top end of the hook 4 is in a horizontal state.

The open end of the hook 4 of the pulley hook is provided with a normally closed self-locking rod 5, and one end of the self-locking rod 5 is elastically hinged on the handle part of the hook 4 through a torsion spring 10: one end of the self-locking rod 5 is hinged on the handle part of the hook 4 through a hinged shaft, the self-locking rod 5 is arranged at the opening of the hook 4, so that the opening is closed after the hook 4 is hung on the cross arm 13, the hook cannot fall off from the cross arm 13, and the safety protection effect is achieved; a handle part at the lower end of the hook 4 is also provided with a limiting block 6, and the limiting block 6 is positioned below the self-locking rod 5; the torsion spring 10 takes the hinge shaft of the self-locking rod 5 as the center, one end of the torsion spring is connected to the limiting block 6, the other end of the torsion spring is connected to the rod body of the self-locking rod 5, and the self-locking rod 5 is downwards clamped on the limiting block 6 under the action of the spring force of the torsion spring 10, so that the self-locking rod 5 is in a normally closed self-locking state;

the lifting unlocking mechanism comprises a lifting ring 1, a connecting rod 2, an unlocking rope 11 and a self-locking rod 5 which are sequentially connected to form the lifting unlocking mechanism, wherein the connecting rod 2 is dynamically connected to a connecting part of a hook 4, and the connecting rod 2 can move up and down relative to the connecting part; a limiting boss is arranged at the lower end of the connecting rod 2, and the diameter of the limiting boss is larger than that of a central through hole in the upper end face of the cylinder 3; the part of the limiting boss part of the connecting rod 2 is arranged in the cylinder 3, the upper end of the connecting rod 2 extends out of a through hole in the center of the upper end surface of the cylinder 3, and the limiting boss can move up and down in the cylinder 3; the lower extreme of connecting rod 2 is connected with the upper end of unblock rope 11, and the lower extreme of unblock rope 11 stretches out the back from drum 3 lower extreme and is connected with from locking lever 5 for the pulling is from locking lever 5 and upwards rotates around the articulated shaft, and the opening of couple 4 is opened, and from locking lever 5 is in the unblock state. The stroke of the connecting rod 5 moving up and down is larger than the stroke of the unlocking rope 11 pulled when the self-locking rod 5 rotates from the locking state to the state that the opening of the hook is completely opened; be provided with lifting hook 16 in unmanned aerial vehicle 17 lower part, when unmanned aerial vehicle 17's lifting hook 16 and rings 1 are connected and upwards promote rings 1, the normally closed type of pulley couple is from locking lever 5 upwards rotation unblock, and the opening of couple 4 is opened, and unmanned aerial vehicle's lifting hook 16 breaks away from then the normally closed type of pulley couple is from locking lever 5 restoring to the throne under the effect of torsional spring 10 spring force and resume the shutting, and the opening of couple 4 is closed with rings 1. After the lifting ring 1 is lifted by the lifting hook 16 and is completely opened from the locking rod 5, the limiting boss moves upwards in the cylinder 3 to the upper end of the limiting boss to be clamped on the upper end surface of the cylinder 3, at the moment, the weight of the pulley hook and the guide rope 8 is borne on the connecting rod 2 and the lifting ring 1, and the unlocking rope 11 only bears the spring force of the torsion spring 10.

The hook 4 is further provided with a guide pipe 12, the unlocking rope 11 penetrates through the guide pipe 12, and the guide pipe 12 is fixed on the hook body and used for guiding the unlocking rope 11, so that the unlocking rope 11 can be conveniently pulled and arranged on the hook body according to a specific direction.

In practical application, the effective working length of the unlocking rope 11 needs to be determined according to the fully opening and closing stroke of the self-locking rod 5, and in the patent, the effective working length of the unlocking rope 11 can be adjusted. The upper end of the unlocking rope 11 is connected with a threaded connector 14, the lower end of the connecting rod 2 is provided with a threaded hole matched with the threaded connector 14, the upper end of the unlocking rope 11 is connected with the lower end of the connecting rod 2 through the threaded connector 14, and the length of the unlocking rope 11 is adjusted by screwing the threads into the lower end of the connecting rod; the effective length of the unlocking cord 11 is shortened when the screw is screwed in, and the effective working length of the unlocking cord 11 is lengthened when the screw is screwed out. The final rotation angle of the self-locking rod 5 is adjusted by adjusting the effective working length of the unlocking rope 11, so that the opening of the hook 4 is completely opened when the lifting hook 16 lifts the lifting ring 1, and the self-locking rod 5 can be stopped at a proper position.

Guide rope 8 is around on pulley 7's runner, guide rope 8's one end is connected with the one end of climbing rope 9, the maintenance staff need get into the electric field during operation, earlier lifting hook 16 through unmanned aerial vehicle 17 promotes rings 1 on the pulley couple, pulley couple is closed type from locking lever 5 of couple 4 under the action of gravity dead weight and guide rope 8 this moment, the opening of couple 4 opens, unmanned aerial vehicle 17 holds couple 4 card that is connected with guide rope 8's pulley couple on the cross arm 13 of iron tower after, unmanned aerial vehicle 17's lifting hook 16 and rings 1 throw off, closed type from locking lever 5 resets this moment, the opening of couple 4 is closed, thereby make 4 safe and reliable's of couple hang on cross arm 13, can not drop. A person under the tower pulls the guide rope 8, the climbing rope 9 is lifted to a rotating wheel of the pulley 7 by pulling the guide rope 8, one end of the climbing rope 9 connected with the guide rope 8 is fixed on the ground, the climbing vehicle is arranged at the other end of the climbing rope 9, and a maintenance person climbs onto the cross arm 13 along the climbing rope 9 through the climbing vehicle 15 (electric automatic climbing) or other climbing tools or lifts the climbing vehicle 15 (manual) onto the cross arm 13 through winching by using the climbing rope 9; the service personnel then enter the electric field working area through the cross arm 13. After the maintenance work is completed, climbing rope 9 is released back to the ground through guide rope 8, then unmanned aerial vehicle 17 again lifts rings 1 and opens hook self-locking rod 5, and then continues to lift rings 1 and take off the pulley hook from cross arm 13.

Claims (8)

1. A method for enabling high-voltage transmission lines to enter an electric field at equal potentials is characterized by comprising the following steps:

step 1, winding the head end of an insulated guide rope (8) around a pulley (7) of a pulley hook on the ground, and winding the middle part of the guide rope (8) on the pulley (7); the tail end of the guide rope (8) is connected with the head end of the insulating climbing rope (9), and the lengths of the guide rope (8) and the climbing rope (9) are respectively greater than twice of the height of the cross arm (13) from the ground; the tail end of the climbing rope (9) is connected with a climbing vehicle (15);

step 2, hanging a lifting hook (16) at the lower part of an unmanned aerial vehicle (17) on a lifting ring (1) at the upper end of a pulley hook, starting the unmanned aerial vehicle (17), and opening a normally-closed self-locking rod (5) of a hook (4) of the pulley hook under the self-weight action of the pulley hook and a guide rope (8) when the unmanned aerial vehicle (17) rises to open the opening of the hook (4); the unmanned aerial vehicle (17) lifts the pulley hook and the guide rope (8) to the cross arm (13) and enables the hook (4) to be clamped on the cross arm (13);

step 3, unhooking a lifting hook (16) of the unmanned aerial vehicle (17) and a lifting ring (1) of the pulley hook, locking a self-locking rod (5) of the pulley hook under the action of a torsion spring (10), and closing an opening of the hook (4);

step 4, a person under the tower pulls the head end of the guide rope (8) to enable the head end of the climbing rope (9) to wind around the pulley (7) along with the guide rope (8) and then fall back to the ground, and then the head end of the climbing rope (9) is fixed;

step 5, the equipotential operators ride on the climbing vehicle (15), the climbing vehicle (15) is lifted to the cross arm (13) along the climbing rope (9), and the equipotential operators enter the wire part along the insulator string; or the climbing vehicle (15) is lifted to the position of the lead along the climbing rope (9), and the equipotential operator directly enters the position of the lead from the climbing vehicle; after the construction is finished in the electric field area, the electric field area returns to the ground through a climbing vehicle (15) according to the original road;

step 6, loosening the head end of the climbing rope (9) from the fixed point, and releasing the guide rope (8) to enable the climbing rope (9) to fall back to the ground;

7, suspending the unmanned aerial vehicle (17) above the pulley hook, hanging the lifting hook (16) on the lifting ring (1) to lift the lifting ring (1), enabling the lifting unlocking mechanism to act, opening the normally-closed self-locking rod (5) of the hook (4), continuing to lift the lifting ring (1), and unhooking the pulley hook from the cross arm (13); then the pulley hook falls back to the ground through an unmanned aerial vehicle (17);

and 8, unhooking the lifting hook (16) and the lifting ring (1) and finishing the overhaul task.

2. The method for the equipotential entrance of the high-voltage transmission line into the electric field according to claim 1, wherein: the lifting unlocking mechanism is composed of a lifting ring (1), a connecting rod (2), an unlocking rope (11) and a self-locking rod (5) which are sequentially connected to the pulley hook, the connecting rod (2) is dynamically connected to the connecting part of the hook (4) of the pulley hook, and the connecting rod (2) can move up and down relative to the connecting part; the lower extreme of connecting rod (2) is connected with from locking lever (5) through unblock rope (11), from locking lever (5) upwards rotation when lifting ring (1) is promoted in lifting hook (16) through unmanned aerial vehicle (17) lower part, and the opening of couple (4) is opened.

3. The method for the equipotential entrance of the high-voltage transmission line into the electric field according to claim 2, wherein: the upper end of the unlocking rope (11) is connected with a threaded joint (14), the lower end of the connecting rod (2) is provided with a threaded hole matched with the threaded joint (14), the upper end of the unlocking rope (11) is connected with the lower end of the connecting rod (2) through threads, and the effective working length of the unlocking rope (11) is adjusted through screwing in the threads.

4. The method for the equipotential entrance of the high-voltage transmission line into the electric field according to claim 2, wherein: the connecting part comprises a lug arranged on the upper end surface of the hook (4) and a cylinder (3) with the lower end connected to the lug, the open end of the cylinder (3) faces downwards, a through hole is formed in the center of the upper end surface of the cylinder (3), and the lower end of the cylinder (3) is connected to the upper end of the hook (4) through the lug; the lower end of the connecting rod (2) is provided with a limiting boss, and the diameter of the limiting boss is larger than that of the through hole; the limiting boss of the connecting rod (2) is arranged in the cylinder (3), the upper end of the connecting rod (2) extends out of the through hole at the upper end of the cylinder (3), and the limiting boss can move up and down in the cylinder (3).

5. The method for the equipotential entrance of the high-voltage transmission line into the electric field according to claim 1, wherein: the hook (4) of the pulley hook is of a plate-shaped structure made of a light plate material, and the hook shape of the hook (4) is of a square structure matched with the width of angle steel of the cross arm (13).

6. The method for the equipotential entrance of the high-voltage transmission line into the electric field according to claim 1, wherein: the top end of a hook (4) of the pulley hook is provided with a connecting part, and the lower end of the handle part of the hook (4) is connected with a pulley (7); a normally closed self-locking rod (5) is arranged at the opening end of the hook (4), and one end of the self-locking rod (5) is elastically hinged on the handle part of the hook (4) through a torsion spring (10); couple (4) lower extreme stalk portion is last to be provided with stopper (6), and stopper (6) are located the below of self-locking pole (5), and self-locking pole (5) are held downwards under the spring force effect of torsional spring (10) on stopper (6) to make self-locking pole (5) be in normal close self-locking state.

7. The method of claim 6, wherein the method comprises the following steps: the connecting point of the connecting part and the upper end of the pulley hook is the intersection point of the gravity center line of the pulley hook and the top end plane of the hook (4) when the top end of the hook (4) is in a horizontal state.

8. The method for enabling the equipotential high-voltage transmission lines to enter the electric field according to claim 6, wherein the method comprises the following steps: the pulley (7) of the pulley hook is connected to the lower end of the handle part of the hook (4) of the pulley hook through a cross hinge.

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