CN102136695A - Overhauling tool used for +/-660kV direct-current transmission line - Google Patents

Abstract

The invention relates to an overhaul tool for ±660kV direct current transmission line, which comprises a fixture and a tensioning device. The fixture is clamped on both sides of an insulator, and the tensioning device is connected between the fixtures. Fixtures include V-string upper clamps, cross-arm upper clamps, single-string clamps, large knife clamps, closed clamps and wire end clamps. The clamps are made of TC4 titanium alloy. It has the advantages of reasonable structure, high overall strength and bearing capacity, small size, light weight, and reliable operation. It is applied to the maintenance of DC 660kV transmission lines, providing a reliable guarantee for the safe operation of the line and the daily maintenance after operation.

Description

Maintenance tool for ±660kV direct current transmission line

technical field

The invention relates to a maintenance tool on a power transmission line, in particular to a maintenance tool specially used for a ±660kV direct current transmission line.

Background technique

With the improvement of my country's power grid construction, ultra-high voltage transmission lines have become the backbone grid of my country's power grid, which also puts forward higher requirements for operation and maintenance work. Especially with the first application of the DC 660kV voltage level transmission line in China, in order to ensure the normal operation of the line and timely repair the problems found in the operation of the line to ensure the safe operation of the DC transmission line, it is necessary to develop a set for Tools required for line operation and maintenance.

One of the main maintenance tasks on transmission lines is the maintenance and replacement of insulators. Most high-voltage transmission lines are supported on cross arms by insulators. Insulators play a basic role in supporting wires and preventing current from returning to ground in overhead transmission lines. The DC 660kV UHV DC transmission line uses different materials compared with the EHV and UHV currently in operation. For example, the wires are 4×JL/G3A-1000/45mm ² steel-cored aluminum stranded wires, and the distance between wire poles is 18m. The linear insulators are V-shaped composite insulators, the length of which is about 8.5m for the lightly polluted area and 9.2m for the heavily polluted area. The tension string adopts double-connected 550kN porcelain insulators. Affected by the length of the insulator string and the electrical clearance, the size of the tower head carrying the insulator and the transmission line becomes larger. Affected by the project, the vertical load of the line also increases correspondingly, which changes the tension and length. This requires the replacement of insulators in tension , length and other aspects have higher requirements. At present, the maintenance equipment for transmission lines below 500kV voltage level in China has been relatively perfect, but due to the increase in voltage level, the increase in transmission line diameter, and the increase in the length of insulator strings, these maintenance equipment can no longer meet the replacement needs.

Contents of the invention

The technical problem to be solved in the present invention is to provide a kind of overhaul tool specially used for ±660kV direct current transmission line.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

Maintenance tools for ±660kV DC transmission lines, including clamps for clamping on both sides of the insulator string and tensioning devices connected between the clamps. The clamps mainly include V-string upper clamps and cross arms The upper clamp, single string clamp, large knife clamp, closed clamp, wire end clamp, the above single string clamp, wire end clamp and closed clamp are all made of TC4 titanium alloy material, and the tensioning device is mechanical transmission lead screw;

When replacing V-shaped single-string insulators, the combined structure of V-string upper clamps, cross-arm upper clamps, single-string clamps and two sets of tensioning devices is adopted, in which the V-string upper clamps are fixedly connected to the angle steel of the metal fittings hanging point on the side of the tower. , the cross-arm upper clamp is fixedly connected to the cross-arm wrapping board, the single-string clamp is fixedly connected to the V-shaped series plate, and the tensioning device is respectively connected to the V-string upper clamp and single-string clamp, as well as the cross-arm upper clamp and single Between string clamps;

When replacing V-type double-string insulators, a combined structure of V-string upper clamps, cross-arm upper clamps, large knife clamps and two sets of tensioning devices is adopted, wherein the V-string upper clamps are fixedly connected to the angle steel at the hanging point of the tower side hardware, and the horizontal The shoulder card is fixedly connected to the cross-arm wrapping board, the big knife card is installed on the V-shaped series plate, and the tensioning device is respectively connected between the V-string upper card and the big knife card, and the cross-arm upper card and the big knife card;

When replacing the middle single-piece, multi-piece insulator, or long-rod insulator, only two sets of closed clips and two sets of tensioning devices are used. The closed clips are set on the steel cap of the insulator, and the tensioning device is connected to the Between two sets of closed cards;

When replacing the first piece of insulator at the cross-arm end, a combined structure of single-series clamps, closed clamps and two sets of tensioning devices is adopted. On the cap, the tensioning device is connected between the single string clamp and the closed clamp;

When replacing the first piece of insulator at the wire end, the combined structure of the wire end clamp, the closed clamp and two sets of tensioning devices is adopted, wherein the wire end clamp is fixedly connected to the wire end connecting plate, and the closed clamp is set on the insulator steel On the cap, the tensioning device is connected between the wire end clamp and the closed clamp.

The specific structure of the V-string upper card is as follows: the V-string upper card includes the V-string upper plate and the V-string lower plate on both sides of the angle steel of the fittings on the side of the tower, and the inner end surface of the V-string upper plate is provided with a The corresponding slot Ⅰ of the angle steel of the fittings hanging point on the body side, one corner of the angle steel of the fittings hanging point on the tower side is located in the slot Ⅰ, and the other corner side of the angle steel of the fittings hanging point on the tower side is located on the upper plate of the V string and under the V string Between the plates, the two ends of the V-string upper plate and the V-string lower plate are pressed by bolts; the outer end surface of the V-string lower plate is hinged with a steel joint I, and the other end of the steel joint I is provided with a tensioning device. pin holes.

The specific structure of the cross-arm upper card: the cross-arm upper card includes the main body of the cross-arm upper card and the steel joint II hinged to it for connecting with the tensioning device. The bolt holes corresponding to the plate connection holes, the connection holes of the cross-arm cladding plate and the bolt holes on the main body of the card on the cross-arm are fixedly connected by bolts.

The specific structure of the single-string fixture: the single-string fixture includes a single-string fixture main body with wing plates on both sides, the ends of the wing plates are provided with pin holes for connecting the tensioning device, and a belt clamp is fixedly connected under the main body. The lower end of the plug-in board is provided with a pin hole corresponding to the position of the connecting hole of the V-type series board. The V-type series board or traction board is located in the slot II of the plug-in board, and is connected with the plug-in board by bolts. Board fixed connection.

The specific structure of the large knife card is as follows: the knife handle end of the large knife card is provided with a pin hole for connecting the tensioning device, the knife head end is provided with a card slot III for clamping the V-shaped series plate, the knife head end, the card The two side walls of the slot III are arranged in an elbow shape, the V-shaped series plate is inserted into the slot III, and the elbow at the end of the cutter head is hooked to the bolt on the V-shaped series plate.

The specific structure of the closed card is as follows: the closed card includes a closed card main body and an upper cover arranged above the closed card main body, one end of the upper cover is movably connected with the closed card main body through a pin shaft, and the other end is connected through The bolt is fixedly connected with the main body of the closed card, and a through hole for accommodating the insulator is provided between the main body of the closed card and the upper cover; pin holes for connecting the tensioning device are respectively provided at both ends of the main body, and the inside of the pin hole is provided with There is a hoisting device for hoisting the insulator, and the hoisting device is a bracket fixed on the main body of the closed card, and the bracket is provided with pulleys for hanging ropes.

The specific structure of the wire end clamp is as follows: the wire end clamp includes a wire end clamp main body and a flip card arranged above the wire end clamp main body, one end of the flip card and the wire end clamp main body pass through a pin The shaft is movably connected, and the other end is fixedly connected to the main body of the wire end clamp through bolts. A through hole for accommodating the wire end connecting plate is arranged between the main body of the wire end clamp and the flipper card; the main body of the wire end clamp and the flipper card Holes corresponding to the nuts on the wire end connecting plate are provided on the top; the two ends of the wire end fixture main body are respectively movably connected with steel joints III for connecting with the tensioning device.

The improvement of the tensioning device is that the tensioning device is a mechanical transmission screw and a hydraulic device connected to one end of the mechanical transmission screw through a positioning pin or an insulating pull rod.

Owing to adopting above-mentioned technical scheme, the technological progress that the present invention obtains is:

The invention is based on the tower structure of the DC transmission line, the way of insulator string hanging on the net, and the parameters of the ground wire. It is a maintenance tool specially used for power failure on the DC 660kV transmission line. It can simultaneously repair V-shaped single string insulators, double Replace string insulators and long rod insulators, which have the advantages of reasonable structure, high overall strength, small size, light weight, and reliable operation, and provide reliability for the safe commissioning of DC 660kV transmission lines and daily maintenance after operation. Assure.

The setting of the lifting device on the closed card can enable the staff to lift the heavy long rod insulator during the operation process of replacing the long rod insulator, which reduces the labor intensity and improves the work efficiency of the staff. The tensioning device is a combination of the mechanical transmission screw and the hydraulic device, which is used for retracting and releasing the empty travel between the fixtures, which solves the disadvantage of slow transmission speed in the hydraulic transmission system under large mechanical loads, and reduces the need for workers working at heights. The residence time of high-altitude operations; and this structure has the effect of mutual protection, that is, when one of them fails, it will not affect the normal operation of the other transmission mechanism, which greatly improves the reliability of work; in addition, due to the use of split structure Assembled design, when the tensioner is not in use, it can be stored separately for easy replacement and maintenance.

Description of drawings

Fig. 1: is the structural representation of the card on the V string of the present invention;

Fig. 2: is the structural representation of the card on the cross arm of the present invention;

Fig. 3: is the front view of the single string fixture of the present invention;

Fig. 4: is the structural schematic diagram of big knife card of the present invention;

Fig. 5: is the top view of Fig. 4;

Fig. 6: is the schematic structural diagram of the closed card of the present invention;

Fig. 7: is the schematic structural view of the wire end fixture of the present invention;

Fig. 8: is the side view of Fig. 7;

Fig. 9: It is the connection diagram for replacing the V-type single string insulators according to the present invention;

Fig. 10: It is the connection diagram for replacing the inner string of the V-type double string insulator according to the present invention;

Figure 11: It is the connection relationship diagram for replacing the outer string of V-type double string insulators according to the present invention;

Fig. 12: is the connection diagram for replacing the long rod type insulator according to the present invention;

Fig. 13: It is the connection relation diagram that the present invention is used for replacing the first piece of insulator at the wire end;

Fig. 14: It is the connection relationship diagram for replacing the first piece of insulator at the horizontal single end according to the present invention.

Among them: 1. V string upper card, 11. V string upper plate, 12. V string lower plate, 13. Steel joint Ⅰ, 14. Card slot Ⅰ, 2. Cross arm upper card, 21. Cross arm upper card body, 22. Steel joint Ⅱ, 3. Single string clamp, 31. Single string clamp body, 32. Wing plate, 33. Card slot Ⅱ, 34. Insert plate, 4. Big knife clamp, 41. Card slot Ⅲ, 5. Closed card, 51. Closed card body, 52. Top cover, 53. Bracket, 54. Pulley, 7. Wire end clamp, 71. Lead wire end clamp main body, 72. Flap card, 73. Steel joint III , 81. Wire terminal board, 82. Cross-arm package board, 83. Traction board, 84. Mechanical transmission screw, 85. Hydraulic device, 86. Insulation rod, 87. V-type series board.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

Maintenance tools for ±660kV direct current transmission lines, including fixtures and tensioning devices, the fixtures are mounted on both sides of the insulator string, and the tensioning device is connected between the fixtures. Fixtures include V-string upper clamp 1, cross-arm upper clamp 2, single-string clamp 3, big knife clamp 4, closed clamp 5, wire end clamp 7, among which single string clamp, wire end clamp and closed clamp They are all made of TC4 titanium alloy material, which has the characteristics of high strength, good plasticity, light weight, small size, high bearing capacity, and is convenient for high-altitude operations.

The upper card 1 of the V string is fixedly connected to the angle steel at the hanging point of the fittings on the side of the tower, and the specific structure is shown in Figure 1. Including V-string upper plate 11, V-string lower plate 12 and steel joint I13, the inner end surface of V-string upper plate 11 is provided with a card slot I corresponding to the angle steel of the fittings hanging point on the side of the tower body, and one of the angle steels of the fittings hanging point on the side of the tower body The corner edge is located in the card slot Ⅰ, and the other corner edge is located between the V-string upper plate 11 and the V-string lower plate 12. The two ends of the V-string upper plate and the V-string lower plate are connected by bolts; the outside of the V-string lower plate 12 A steel joint I13 is hinged on the end face, and the other end of the steel joint I is provided with a pin hole for connecting the tensioning device.

The cross-arm upper card 2 is fixedly connected on the cross-arm cladding plate 82, and the specific structure is shown in FIG. 2 . It includes the upper card main body 21 of the cross arm and the steel joint II 22 which is movably connected therewith. The cross-arm upper card includes two triangular aluminum alloy plates set accordingly. The steel joint II is located between the two triangular aluminum alloy plates. The alloy plate is provided with pin holes corresponding to the connecting holes on the cross-arm cladding plate. When connecting, insert the cross-arm cladding plate between two triangular aluminum alloy plates, and fix them with the pin holes of the aluminum alloy plates through bolts.

The single series fixture 3 is fixedly connected above the V-shaped series plate 87 or the traction link plate 83, and the specific structure is shown in FIG. 3 . The single-string fixture 3 includes a single-string fixture main body 31, a wing plate 32 and an inserting plate 34, the two sides of the single-string fixture main body 31 are provided with wing plates 32, and the ends of the wing plates are provided with pin holes for connecting tensioning devices , the inserting plate 34 is fixedly connected under the main body 31 of the single-string fixture, the lower part of the inserting plate 34 is provided with a card slot II 33, and the lower end of the inserting plate is provided with a pin corresponding to the position of the connecting hole on the V-shaped series plate or the traction joint plate The V-shaped series plate or the traction plate is located in the card slot II of the plug-in board, and is fixedly connected with the plug-in board by bolts, and the two strings of V-shaped single-string insulators can be replaced at the same time.

The big knife card 4 is fixedly connected on the V-shaped series plate 87, and the specific structure is shown in Fig. 4 and Fig. 5 . The knife handle end of the large knife card 4 is provided with a pin hole for connecting the tensioning device, and the knife head end is provided with a card slot III for clamping a V-shaped series plate. set up. When using the large knife card, insert the V-shaped series plate 87 into the card slot III, hook the elbow at the end of the knife head to the bolt on the V-shaped series plate, and at the same time apply force to the knife handle end of the large knife card in the direction opposite to that of the bolt. The pulling force can realize the fixing of the big knife card and the V-shaped series plate.

The closed card 5 is sleeved on the steel cap of the insulator, and the specific structure is as shown in Figure 6. It includes a closed card main body 51 and an upper cover 52 arranged above the closed card main body. One end of the upper cover is movably connected with the closed card main body through a pin shaft, and the other end is fixedly connected with the closed card main body through bolts. The closed card main body There is a through hole for accommodating the insulator between the upper cover and the upper cover, and the insulator is located in the through hole; the two ends of the main body are respectively provided with pin holes for connecting the tensioning device, and the inner side of the pin hole is provided with a lifting device for lifting the insulator. The hoisting device is a bracket 53 fixed on the main body of the closed card, and the bracket is provided with a pulley 54 for hanging ropes.

The wire end fixture 7 is fixedly connected to the wire terminal plate 81, and the specific structure is shown in Fig. 7 and Fig. 8 . It includes a wire end clamp main body 71 and a flap clamp 72, the flip clamp 72 is arranged above the wire end clamp main body, one end of the flip clamp is movably connected with the wire end clamp main body 71 through a pin shaft, and the other end is connected to the wire end clamp through a bolt. The main body of the wire end clamp is fixedly connected, and a through hole for accommodating the wire terminal board is arranged between the wire end clamp main body and the flipper card, and the wire terminal board is in the through hole; the wire end clamp main body 71 and the flipper card 72 There are also holes corresponding to the nuts on the wire end connecting plate; the two ends of the wire end fixture main body 71 are respectively movably connected with steel joints III 73 for connecting with the tensioning device.

The tensioning device is connected between the V-string upper clamp and the single-string clamp, and between the cross-arm upper clamp and the single-string clamp. The tensioning device is a combination of a mechanical transmission screw 84 and a hydraulic device 85. The mechanical transmission wire The bar and the hydraulic device are connected by an insulating pull rod 86.

Example 1

When the present invention is used to replace V-shaped single-string insulators on a DC 660kV transmission line, the combination of V-string upper clamp 1, cross-arm upper clamp 2, single-string clamp 3 and two sets of tensioning devices is used for replacement, as shown in Figure 9 shown.

Firstly insert the plug-in plate 34 of the single-string fixture 3 with the card slot II 33 on the top of the V-shaped series plate 87, align the connection holes on the V-shaped series plate 87 with the pin holes of the single-string fixture 3, and insert the bolts , so that the single-string fixture 3 is fixed on the V-shaped series plate 87; the angle steel at the hanging point of the metal fittings on the side of the tower is placed between the V-string upper plate 11 and the V-string lower plate 12, so that the vertical end of the angle steel is clamped on the V-string In the slot I of the upper plate 11, the other corner of the angle steel is located between the V-string upper plate 11 and the V-string lower plate 12, and then the two ends of the V-string upper plate 11 and the V-string lower plate 12 are fixedly connected by bolts ; Insert the cross-arm cladding plate between the two triangular aluminum alloy plates of the upper card 2 on the cross-arm, make the pin holes on the aluminum alloy plate correspond to the connection holes on the cross-arm cladding plate, and then use bolts to penetrate the pins Between the hole and the connection hole, the upper card of the cross arm is fixedly connected to the cross arm package board;

Secondly, assemble the first set of tensioning device, and connect one end of the hydraulic device 85 to the end with the pin hole of the steel joint I13 of the card 1 on the V string through the pin shaft, and the other end of the hydraulic device 85 is connected to the mechanical One end of the transmission lead screw 84 is fixedly connected, and the other end of the mechanical transmission lead screw 84 is movably connected with a pin hole of the single string clamp 3 through a pin; The pin shaft is movably connected to one end of the card 2 steel joint II22 with a pin hole on the cross arm, the other end of the hydraulic device 85 is fixedly connected to one end of the mechanical transmission screw 84 through an insulating pull rod, and the other end of the mechanical transmission screw 84 is passed Pin shaft is movably connected with another pin hole of single-string clamp 3.

After the connection is completed, tighten the lead screw or start the hydraulic device to make the tension between the V-string upper clamp and the cross-arm upper clamp and the single-string clamp, so that the insulator string is loose and no longer has tension, and the V-shaped single string can be performed. Insulator replacement.

Example 2

When the present invention is used for replacing V-shaped double-string insulators on a DC 660kV transmission line, different combinations of inner strings and outer strings to be replaced are completed.

When replacing the inner string of the V-type double-string insulator, use the combination of the upper card 1 of the V string, the big knife card 4 and the tensioning device for replacement, as shown in Figure 10. First, insert the V-shaped series plate 87 into the card slot III of the large knife card 4, hook the elbow at the end of the knife head to the bolt on the V-shaped series plate, and at the same time apply force to the knife handle end of the large knife card in the direction opposite to that of the bolt. The pulling force can realize the fixing of the big knife card and the V-shaped series plate; the connection between the upper card 1 of the V series and the hanging point angle steel of the tower body side is the same as the connection method in embodiment 1; then the tensioning device is assembled, and the mechanical transmission wire One end of the rod 84 is movably connected to one end of the steel joint I13 of the card 1 on the V string with a pin hole through a pin shaft, and the other end of the mechanical transmission screw 84 is fixedly connected to one end of the hydraulic device 85 through an insulating pull rod 86, and the hydraulic device The other end of 85 is movably connected with the pin hole at the end of the knife handle of the big knife card by pin shaft.

After the connection is completed, tighten the lead screw or start the hydraulic device to make the tension between the V-string upper card and the big knife card, so that the inner string insulator is loose, and there is no tension, and then it can be replaced.

When replacing the outer string of V-shaped double-string insulators, use the combination of the cross arm upper card 2, the big knife card 4 and the tensioning device for replacement, as shown in Figure 11. First, insert the V-shaped series plate 87 into the card slot III of the large knife card 4, hook the elbow at the end of the knife head to the bolt on the V-shaped series plate, and at the same time apply force to the knife handle end of the large knife card in the direction opposite to that of the bolt. The pulling force can realize the fixing of the big knife card and the V-shaped series plate;

The connection of the card 2 on the cross-arm and the cladding plate 82 of the cross-arm is the same as the connection mode in Embodiment 1;

Then one end of the mechanical transmission lead screw 84 is movably connected to the end of the card 2 steel joint II 22 with a pin hole on the cross arm through a pin shaft, and the other end of the mechanical transmission lead screw 84 is fixedly connected to one end of the hydraulic device 85 through an insulating pull rod , the other end of the hydraulic device 85 is movably connected with the pin hole of the knife handle end of the large knife card by the pin shaft.

After the connection is completed, tighten the lead screw or start the hydraulic device to make the tension between the upper card of the cross arm and the knife card, so that the outer string insulators are loose, and there is no tension, and then they can be replaced.

Example 3

When the present invention is used to replace intermediate single-piece, multi-piece insulators, or long-rod insulators on a DC 660kV transmission line, it can be completed by only using two closed clamps 5 and two sets of tensioning devices, as shown in FIG. 12 . Open the upper cover 52 of the closed card, make it rotate around the pin shaft to one side of the main body of the closed card, then install the closed card on the steel caps at both ends of the insulator, fasten the upper cover to the original position, and use the bolt The upper cover is fixedly connected with the main body of the closed card, and the closed card can be fixed on the insulator; then the mechanical transmission screw and the hydraulic device of the tensioning device are respectively connected to the pin holes at both ends of the closed card 5, and then the The insulating rod 86 is connected between the mechanical transmission lead screw and the hydraulic device, so as to meet the tension of the insulator when the insulator is relatively long.

After the connection is completed, tighten the lead screw or start the hydraulic device to tension the closed clamps, so that the insulators are loose, and there is no more tension, and the insulators can be replaced.

When the weight of the insulator is heavy, the lifting device on the closed card is used to lift the insulator, which saves manpower input and improves the safety performance of the operation process.

Example 4

When the present invention is used to replace the first insulator at the lead end on a DC 660kV transmission line, the lead end clamp 7, the closed clamp 5 and the tensioning device are used for replacement, as shown in FIG. 13 . The difference between this embodiment and Embodiment 3 is that: install a set of closed clamps on the steel cap of the second piece of insulator at the wire end; On one side of the main body 71, the wire end connecting plate is clamped between the main body of the wire end clamp 7 and the flap clamp, and the nut on the wire end connecting plate is snapped into the bolt hole of the wire end clamp, and then The other end of the flip card is fixedly connected with the main body of the wire end fixture with bolts.

Example 5

When the present invention is used to replace the first insulator at the cross-arm end on a DC 660kV transmission line, the replacement is performed in the form of a single-string clamp, a closed clamp and a tensioning device, as shown in Figure 14. The difference between this embodiment and Embodiment 4 is: install a set of closed clamps on the steel cap of the second insulator at the cross-arm end; clamp the traction joint plate in the slot II of the single-string clamp, and then The single-string clamp is fixedly connected to the traction link plate with bolts.

Claims (8)

1. be used for ± check man's utensil of 660kV DC power transmission line, comprise and be used to be installed on the jig of insulator string both sides and be connected in tensioning apparatus between the jig, it is characterized in that: described jig mainly comprises on the V string card (2) on card (1), the cross-arm, single string jig (3), machete card (4), closed fixture (5), conductor wire end jig (7), above-mentioned single string jig, conductor wire end jig and closed fixture all adopt the TC4 titanium alloy material to make, and described tensioning apparatus is the machine driving leading screw;

When changing V-type list insulator string, adopt V string to go up card on card, the cross-arm, single jig and two combining structures of overlapping tensioning apparatus of going here and there, wherein card (1) is fixedly connected on the body of the tower side gold utensil hanging point angle steel on the V string, card (2) is fixedly connected on the cross-arm wrapper sheet on the cross-arm, single string jig (3) is fixedly connected on the V-type series board, and tensioning apparatus is connected to V string on the card and single string jig and cross-arm card and list and goes here and there between the jig;

When changing the two insulator string of V-type, the combining structures of card, machete card and two cover tensioning apparatus on card, the cross-arm on the employing V string, wherein card (1) is fixedly connected on the body of the tower side gold utensil hanging point angle steel on the V string, card (2) is fixedly connected on the cross-arm wrapper sheet on the cross-arm, machete card (4) is installed on the V-type series board, and tensioning apparatus is connected on the V string on card and machete card and the cross-arm between the card and machete card;

When monolithic, multi-disc insulator or long excellent type insulator, only adopt the combining structures of two cover closed fixtures and two cover tensioning apparatus in the middle of changing, wherein closed fixture (5) is sleeved on the insulator steel cap, and tensioning apparatus is connected between the two cover closed fixtures;

When changing first insulator of cross-arm end, adopt the combining structure of single string jig, closed fixture and two cover tensioning apparatus, wherein single string jig (3) is fixedly connected on the traction yoke plate, and closed fixture (5) is sleeved on the insulator steel cap, and tensioning apparatus is connected between single string jig and the closed fixture;

When first insulator of restringing end, adopt the combining structure of conductor wire end jig, closed fixture and two cover tensioning apparatus, wherein conductor wire end jig (7) is fixedly connected on the conductor wire end yoke plate, closed fixture (5) is sleeved on the insulator steel cap, and tensioning apparatus is connected between conductor wire end jig and the closed fixture.

2. check man's utensil of according to claim 1 being used for ± 660kV DC power transmission line, it is characterized in that: card (1) comprises V string upper plate (11) and the V string lower plate (12) that is positioned at body of the tower side gold utensil hanging point angle steel both sides on the described V string, described V string upper plate (11) inner face is provided with and the body of the tower side gold utensil hanging point corresponding draw-in groove I of angle steel (14), an arm of angle of body of the tower side gold utensil hanging point angle steel is positioned at the draw-in groove I, another arm of angle of body of the tower side gold utensil hanging point angle steel is between V string upper plate and V string lower plate, and the two ends of V string upper plate and V string lower plate compress angle steel by bolt; Be hinged with steel joint I (13) on the outer face of V string lower plate (12), the other end of steel joint I is provided with the pin-and-hole that is connected with tensioning apparatus.

3. check man's utensil of according to claim 1 being used for ± 660kV DC power transmission line, it is characterized in that: card (2) comprises and blocks main body (21) and the hinged steel joint II (22) that is connected with tensioning apparatus of being used for it on the cross-arm on the described cross-arm, the card main body is provided with and cross-arm wrapper sheet connecting hole corresponding bolts hole on the cross-arm, and the bolt hole on the connecting hole of cross-arm wrapper sheet and the cross-arm on the card main body is bolted to connection.

4. check man's utensil of according to claim 1 being used for ± 660kV DC power transmission line, it is characterized in that: described single string jig (3) comprises that both sides are provided with single string jig main body (31) of wing plate (32), and the end of wing plate is provided with the pin-and-hole that connects tensioning apparatus; The main body below is fixedly connected with the plate (34) of band draw-in groove II (33), the bottom of plate is provided with the V-type series board or draws the corresponding pin-and-hole in connecting hole position on the yoke plate, V-type series board or traction yoke plate are positioned at the draw-in groove II of plate, and by bolt it are fixedlyed connected with plate.

5. check man's utensil of according to claim 1 being used for ± 660kV DC power transmission line, it is characterized in that: the hilt end of described machete card (4) is provided with the pin-and-hole that is used to connect tensioning apparatus, the cutter head end is provided with the draw-in groove III (41) that is used to clamp the V-type series board, the two side embayment head of cutter head end, draw-in groove III is provided with, the V-type series board inserts in the draw-in groove III, and the elbow of cutter head end is caught on bolt on the V-type series board.

6. check man's utensil of according to claim 1 being used for ± 660kV DC power transmission line, it is characterized in that: described closed fixture (5) comprises closed fixture main body (51) and is arranged on the loam cake (52) of closed fixture main body top, one end of loam cake is connected with the closed fixture subject activity by bearing pin, the other end is fixedlyed connected with the closed fixture main body by bolt, in the through hole of insulator between closed fixture main body and loam cake; The both ends of described main body are provided with the pin-and-hole that is used to connect tensioning apparatus respectively, the inboard of pin-and-hole is provided with the boom hoisting that is used to lift by crane insulator, described boom hoisting is the support (53) that is fixed on the closed fixture main body, and support is provided with the pulley (54) that is used for suspension cord.

7. check man's utensil of according to claim 1 being used for ± 660kV DC power transmission line, it is characterized in that: described conductor wire end jig (7) comprises conductor wire end jig main body (71) and is arranged on the turnover panel card (72) of conductor wire end jig main body top, one end of turnover panel card and conductor wire end jig main body (71) flexibly connect by bearing pin, the other end is fixedlyed connected with conductor wire end jig main body by bolt, in the through hole of conductor wire end yoke plate between conductor wire end jig main body and turnover panel card; Be provided with on described conductor wire end jig main body (71) and the turnover panel card (72) with the conductor wire end yoke plate on the corresponding hole of nut; The both ends of described conductor wire end jig main body (71) are connected with respectively and are used for the steel joint III (73) that is connected with tensioning apparatus.

8. according to check man's utensil of claim 1 to 7 each described being used for ± 660kV DC power transmission line, it is characterized in that: described tensioning apparatus is machine driving leading screw and the hydraulic means that is connected with machine driving leading screw one end.

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