Pressure-measurable live replacement device for double insulator strings and operation method

Abstract

The present invention relates to a pressure-measurable live replacement device for a double-insulator string and an operation method. The device comprises a pressure sensor digital display lead screw, a length-adjustable insulating rod and a fork-shaped fixture. The pressure sensor digital display lead screw comprises a linear lead screw, a lead screw support, a pressure sensor, a control unit and a display unit. The lead screw lower end of the linear lead screw is connected to the upper end of the insulating rod, and the nut seat of the linear lead screw is installed on the lead screw support via a pressure sensor. The lead screw support is a cross arm clamp structure. The pressure sensor is connected to the control unit, and the control unit is connected to the display unit. The upper end of the fork-shaped fixture is connected to the lower end of the insulating rod, and the two fixtures at the lower end of the fork-shaped fixture are provided with a pin for connecting a delta connecting plate. The device and the operation method are conducive to convenient, safe and efficient live replacement of a double-insulated suspension insulator string at ground potential.

Description

Technical Field

[0001] The invention belongs to the field of electric power working tools and apparatuses, and in particular relates to a pressure-measurable live replacement device for a double-connected insulator string and an operating method. Background Art

[0002] In recent years, with the further improvement of transmission line design standards, the structural forms of transmission line towers have become more diversified. At present, the tools for live replacement of straight tower tension double insulator strings generally have the following shortcomings: 1. A large number of tools are required, and the labor intensity of working on the tower is high; 2. The metal double hooks of the conductors used in the operation are relatively long (up to 400mm~600mm), and too many insulators are short-circuited during assembly, which poses certain safety hazards; 3. After the double-linked double-hanging-point insulator string is lifted, the triangular connecting plate sags to a skewed state due to gravity, and it becomes extremely difficult to remotely operate the insulator ball head in and out of the bowl head at ground potential; 4. The double-hook hardware is easy to wear the conductor when lifting the conductor; 5. When encountering large-span, large-span, and large-height-difference line towers, the conductor load cannot be evaluated, and the tightening screw rod needs to tighten a large stroke, and sometimes it may be impossible to replace it live. Summary of the invention

[0003] The object of the present invention is to provide a pressure-measurable live replacement device and operating method for a double insulator string, which is conducive to convenient, safe and efficient live replacement of a double suspension insulator string at ground potential.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a pressure-measurable live replacement double insulator string device, comprising a pressure sensor digital display lead screw, a length-adjustable insulating pull rod and a fork-type clamp, the pressure sensor digital display lead screw comprises a linear lead screw, a lead screw support, a pressure sensor, a control unit and a display unit, the lead screw lower end of the linear lead screw is connected to the upper end of the insulating pull rod, the nut seat of the linear lead screw is installed on the lead screw support via the pressure sensor, the lead screw support is a cross-arm clamp structure, the pressure sensor is connected to the control unit, and the control unit is connected to the display unit; the upper end of the fork-type clamp is connected to the lower end of the insulating pull rod, and the two clamps at the lower end of the fork-type clamp are provided with pins for connecting the delta connecting plate.

[0005] Furthermore, the pressure sensor is a cylindrical pressure sensor, and the nut seat is connected to the pressure sensor via a pressure bearing.

[0006] Furthermore, the control unit is provided with a wireless communication module to establish a wireless connection with an external terminal or system and transmit data through the wireless communication module.

[0007] Furthermore, the outer side of the nut seat is connected to a metal transverse rocker.

[0008] Furthermore, the length-adjustable insulating pull rod includes a hollow sleeve, an upper connecting rod and a lower connecting rod. The lower section of the upper connecting rod and the upper section of the lower connecting rod are respectively inserted into the hollow sleeve and can be extended up and down. The upper end of the upper connecting rod is connected to the screw rod of the linear screw rod, and the lower end of the lower connecting rod is connected to the fork-shaped clamp.

[0009] Furthermore, the lower section of the upper connecting rod and the upper section of the lower connecting rod are respectively provided with a plurality of equidistant positioning holes along the length direction, and the upper section of the hollow sleeve is correspondingly provided with a plurality of positioning holes along the length direction, so that when the upper connecting rod and the lower connecting rod are telescopically adjusted to a desired length relative to the hollow sleeve, high-strength bolts are passed through the overlapping positioning holes inside and outside and fixed with high-strength nuts to achieve length positioning of the insulating pull rod.

[0010] Furthermore, the fork-shaped clamp includes a pull rod connection part, a transverse connection part and two clamps, the upper end of the pull rod connection part is threadedly connected to the lower end of the insulating pull rod, the lower end of the pull rod connection part is fixedly connected to the middle part of the transverse connection part, and the upper ends of the two clamps are rotatably connected to the left and right sides of the transverse connection part respectively to adjust the fork angle formed by the two clamps so that the fork-shaped clamp is suitable for different types of triangular connecting plates. The lower end of the clamp is provided with a pin to be inserted into the reserved hole of the triangular connecting plate to realize the connection between the fork-shaped clamp and the triangular connecting plate.

[0011] The present invention also provides a pressure-measurable live replacement double insulator string operation method, comprising the following steps:

[0012] 1) The operator climbs the tower to the cross arm position, and the ground personnel hoist the device onto the tower;

[0013] 2) The operator adjusts the length of the adjustable insulating pull rod to match the insulator string;

[0014] 3) Make the screw support clamped on the cross arm, and remotely adjust the fork angle formed by the two clamps at the lower end of the fork-type clamp through the insulating operating rod, so that the pin on the clamp is inserted into the reserved hole of the triangular connecting plate;

[0015] 4) The operator tightens the linear screw and observes the pressure value displayed on the display unit. He lifts the conductor within the allowable load range to relax the suspension insulator string, thereby achieving live replacement of the double suspension insulator string at ground potential.

[0016] Compared with the prior art, the present invention has the following beneficial effects: by arranging a pressure sensor digital display screw rod, a length-adjustable insulating pull rod and a fork-shaped clamp on the device, the tools required for the operation process are reduced, and the damage to the conductor by the traditional metal double hook is avoided. The device can be used to simply, conveniently and efficiently replace the double-linked suspension insulator string on the transmission line under ground potential, and the bearing load during the operation can be monitored in real time, solving many problems existing in previous operations such as high labor intensity, low safety factor and low work efficiency. Therefore, the present invention has strong practicality and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the device according to an embodiment of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the digital display screw of the pressure sensor in an embodiment of the present invention.

[0019] Figure 3 Schematic diagram of the structure of the fork-type clamp in the embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the working state of the device in an embodiment of the present invention.

[0021] In the figure: 1- digital display screw of pressure sensor, 2- length adjustable insulating pull rod, 3- fork type clamp, 4- cylindrical pressure sensor, 5- display unit, 6- screw support, 7- straight tower cross arm, 8- double suspension insulator string, 9- triangle connecting plate, 10- double split suspension wire clamp, 11- double split conductor, 12- control unit, 13- screw, 14- nut seat, 15- pressure bearing, 16- metal lateral rocker, 21- upper connecting rod, 22- hollow casing, 23- lower connecting rod, 24- positioning hole, 25- high strength bolt, 31- pull rod connecting part, 32- lateral connecting part, 33- clamp, 34- pin. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The present invention provides a pressure-measurable live replacement device for a double insulator string, such as Figure 1-4 As shown, it includes a pressure sensor digital display screw rod 1, a length-adjustable insulating pull rod 2 and a fork-shaped clamp 3.

[0024] The pressure sensor digital display screw 1 includes a linear screw, a screw support 6, a pressure sensor 4, a control unit 12 and a display unit 5. The lower end of the screw 13 of the linear screw is rotatably connected to the upper end of the insulating pull rod 2. The nut seat 14 of the linear screw is installed on the screw support 6 through the pressure sensor 4. The screw support 6 is a cross-arm clamping structure so that it can be clamped on the cross-arm during operation. The pressure sensor 4 is connected to the control unit 12, and the control unit 12 is connected to the display unit 5.

[0025] In this embodiment, the linear screw adopts a reinforced anti-torsion and labor-saving linear screw, which is made of 60Si2Mn and has a yield strength greater than 800MPa, which can fully meet the strength requirements of the screw when it is subjected to force. The pressure sensor 4 adopts a cylindrical pressure sensor, and a pressure bearing is installed at the force-bearing part. The nut seat 14 is connected to the pressure sensor 4 through the pressure bearing 15. The outer side of the nut seat 14 is connected to a metal transverse rocker 16. The screw support is designed according to the crossbar card structure and adopts LC4.cs material with a yield strength greater than 400MPa. The display unit is rechargeable and has a range of 0-50KN. In order to facilitate remote monitoring of the load during the operation, a wireless communication module can be set on the control unit 12 to establish a wireless connection with an external terminal or system through the wireless communication module and transmit data. Wireless communication can adopt communication methods such as Bluetooth and WIFI.

[0026] The length-adjustable insulating rod 2 comprises a hollow sleeve 22, an upper connecting rod 21 and a lower connecting rod 23. The lower section of the upper connecting rod 21 and the upper section of the lower connecting rod 23 are respectively inserted into the hollow sleeve 22 and can be extended and retracted up and down. The upper end of the upper connecting rod 21 is connected to the screw rod 13 of the linear screw rod, and the lower end of the lower connecting rod 23 is connected to the fork-shaped fixture 3. The lower section of the upper connecting rod 21 and the upper section of the lower connecting rod 23 are respectively provided with a plurality of equidistant positioning holes 24 along the length direction, and the upper section of the hollow sleeve 22 is correspondingly provided with a plurality of positioning holes along the length direction, so that when the upper connecting rod 21 and the lower connecting rod 23 are adjusted to the desired length relative to the hollow sleeve 22, the high-strength bolts 25 are passed through the positioning holes that overlap inside and outside and fixed with high-strength nuts to achieve the length positioning of the insulating rod.

[0027] In this embodiment, the length-adjustable insulating pull rod 2 is made of moisture-proof filling tube material, which complies with the provisions of JB / T8150.2 and IEC855, and has the characteristics of high mechanical strength (#32, 20 tons), tensile strength, torsion resistance and adjustable length, and the insulation performance is sufficient to meet the requirements of live working.

[0028] The upper end of the fork-shaped fixture 3 is connected to the lower end of the insulating pull rod 2, and the two fixtures at the lower end of the fork-shaped fixture 3 are provided with a pin for connecting the triangular connecting plate. In this embodiment, the fork-shaped fixture is an adjustable fork-shaped fixture, including a pull rod connecting part 31, a transverse connecting part 32 and two fixtures 33. The upper end of the pull rod connecting part 31 is threadedly connected to the lower end of the insulating pull rod 2, and the lower end of the pull rod connecting part 31 is fixedly connected to the middle of the transverse connecting part 32. The upper ends of the two fixtures 33 are rotatably connected to the left and right sides of the transverse connecting part 32 respectively to adjust the fork angle formed by the two fixtures so that the fork-shaped fixture is suitable for triangular connecting plates of different models. The lower end of the fixture 33 is provided with a pin 34 to be inserted into the reserved hole of the triangular connecting plate 9 to realize the connection between the fork-shaped fixture 3 and the triangular connecting plate 9. The fork-shaped fixture is made of super-hard aluminum alloy LC4.cs material.

[0029] The present invention also provides a method for replacing a double insulator string under power by using the above device, comprising the following steps:

[0030] 1) The operator climbs the tower to the cross arm 7 position, and the ground personnel hoist the device onto the tower;

[0031] 2) The operator adjusts the length of the adjustable insulating pull rod 2 to match the insulator string 8;

[0032] 3) The screw support 6 is clamped on the cross arm, and the fork angle formed by the two clamps 33 at the lower end of the fork-shaped clamp 3 is remotely adjusted through the insulating operating rod, so that the pin 34 on the clamp 33 is inserted into the reserved hole of the triangular connecting plate 9;

[0033] 4) The operator tightens the linear screw 1, observes the pressure value displayed on the display unit 5, and lifts the conductor 11 within the load allowable range to relax the suspension insulator string 8, thereby achieving live replacement of the double suspension insulator string at ground potential.

[0034] In the device of the present invention, the pressure sensor digital display screw can intuitively and in real time display the lifting load and can be conveniently received and monitored by ground terminal equipment through wireless transmission. The design of the fork-type clamp replaces the traditional metal double hook, and by remotely operating the fork angles of the two clamps, the fork-type clamp is suitable for different types of triangular connecting plates. The use of the fork-type clamp effectively avoids the damage to the wire by the traditional metal double hook. At the same time, the total length of the hardware at the connection between the fork-type clamp and the pull rod is about 200mm, which avoids the safety hazard caused by the short-circuiting of too many insulators by the double hook of the hardware in the traditional method during the lifting and installation process. The whole set of operating procedures requires fewer tools. The use of fork-type clamps can always ensure that the triangular connecting plate is in a stressed state. The screw only needs to be lifted by 3 to 5 centimeters to relax the insulator string, which greatly reduces the difficulty of operating the first insulator on the conductor side in and out of the bowl head.

[0035] The above are preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, as long as the resulting functions do not exceed the scope of the technical solution of the present invention, belong to the protection scope of the present invention.

Claims

1. A pressure-measurable live replacement double insulator string device, characterized in that: It includes a pressure sensor digital display lead screw, a length-adjustable insulating pull rod and a fork-shaped fixture. The pressure sensor digital display lead screw includes a linear lead screw, a lead screw support, a pressure sensor, a control unit and a display unit. The lead screw lower end of the linear lead screw is connected to the upper end of the insulating pull rod. The nut seat of the linear lead screw is installed on the lead screw support via the pressure sensor. The lead screw support is a cross arm clamp structure. The pressure sensor is connected to the control unit, and the control unit is connected to the display unit. The upper end of the fork-shaped fixture is connected to the lower end of the insulating pull rod. The two fixtures at the lower end of the fork-shaped fixture are provided with a pin for connecting a triangular connecting plate. The fork-shaped clamp includes a pull rod connection part, a transverse connection part and two clamps. The upper end of the pull rod connection part is threadedly connected to the lower end of the insulating pull rod, and the lower end of the pull rod connection part is fixedly connected to the middle part of the transverse connection part. The upper ends of the two clamps are rotatably connected to the left and right sides of the transverse connection part respectively to adjust the fork angle formed by the two clamps so that the fork-shaped clamp is suitable for different types of triangular connecting plates. The lower end of the clamp is provided with a pin to be inserted into the reserved hole of the triangular connecting plate to realize the connection between the fork-shaped clamp and the triangular connecting plate.

2. The pressure-measurable live replacement double insulator string device according to claim 1 is characterized in that: The pressure sensor is a cylindrical pressure sensor, and the nut seat is connected to the pressure sensor via a pressure bearing.

3. The pressure-measurable live replacement double insulator string device according to claim 1 is characterized in that: The control unit is provided with a wireless communication module to establish a wireless connection with an external terminal or system and transmit data through the wireless communication module.

4. The pressure-measurable live replacement double insulator string device according to claim 1 is characterized in that: The outer side of the nut seat is connected with a metal transverse rocker.

5. The pressure-measurable live replacement double insulator string device according to claim 1 is characterized in that: The length-adjustable insulating pull rod includes a hollow sleeve, an upper connecting rod and a lower connecting rod. The lower section of the upper connecting rod and the upper section of the lower connecting rod are respectively inserted into the hollow sleeve and can be extended up and down. The upper end of the upper connecting rod is connected to the screw rod of the linear screw rod, and the lower end of the lower connecting rod is connected to the fork-shaped clamp.

6. The pressure-measurable live replacement double insulator string device according to claim 5 is characterized in that: The lower section of the upper connecting rod and the upper section of the lower connecting rod are respectively provided with a number of equidistant positioning holes along the length direction, and the upper section of the hollow sleeve is correspondingly provided with a number of positioning holes along the length direction, so that when the upper connecting rod and the lower connecting rod are telescopically adjusted to the required length relative to the hollow sleeve, high-strength bolts are passed through the overlapping positioning holes inside and outside and fixed with high-strength nuts to achieve the length positioning of the insulating pull rod.

7. A method for replacing a double insulator string under live pressure with measurable pressure, applied to the device for replacing a double insulator string under live pressure with measurable pressure as claimed in claim 1, comprising the following steps: 1) The operator climbs the tower to the cross arm position, and the ground personnel hoist the pressure-measurable live replacement double insulator string device onto the tower; 2) The operator adjusts the length of the adjustable insulating pull rod to match the insulator string; 3) Make the screw support clamped on the cross arm, and remotely adjust the fork angle formed by the two clamps at the lower end of the fork-type clamp through the insulating operating rod, so that the pin on the clamp is inserted into the reserved hole of the triangular connecting plate; 4) The operator tightens the linear screw and observes the pressure value displayed on the display unit. He lifts the conductor within the allowable load range to relax the suspension insulator string, thereby achieving live replacement of the double suspension insulator string at ground potential.

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