Load transfer tool for large-section wire of power transmission line

Abstract

The utility model discloses a load transfer tool for a large-cross-section wire of a power transmission line. The load transfer tool comprises a parallel lead screw assembly, and a pulling plate and a fixture which are connected with two ends of the parallel lead screw assembly, the parallel lead screw assembly comprises lead screws arranged side by side, and bearing plates are fixed to the two ends of the lead screws. The pulling plate and the clamp are connected to the force bearing plate; the clamp can clamp and fix yoke plates at the two ends of the insulator; the screw rod comprises an inner screw rod and an outer screw rod which are sleeved inside and outside, a screw rod nut seat is fixedly arranged at the end part of the outer screw rod, and the inner screw rod is in threaded connection with the screw rod nut seat; the inner screw rod is screwed into the outer screw rod and the screw rod nut seat by rotating the outer screw rod, so that the bearing plate can be tightened, and the clamps at the two ends are driven to be close to each other. The tool is provided with novel lead screw assemblies which are connected in parallel, so that tension required by replacement of an insulator of a power transmission line is generated sufficiently, and the replacement of the insulator is assisted; by using the tool, the insulator replacement difficulty is reduced, the safety of operators is effectively ensured, the labor intensity is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission lines, and particularly relates to a load transfer tool for large cross-section conductors of transmission lines. Background Technique

[0002] With the rapid development of the power grid, the transmission load is getting larger and larger, the required conductor diameter is getting thicker, and the number of lines using LGJ-630 double-split conductors is increasing accordingly. Due to the operating environment of the transmission line, the line insulators are easily affected by factors such as lightning strikes, bird damage, pollution, and icing. The deterioration, self-explosion, or even flashover of the entire string of insulators during operation has become a common defect in transmission lines. To ensure the safe and stable operation of the line, insulator replacement tools need to be used to replace them in a timely manner.

[0003] At present, traditional maintenance tools are difficult to meet the load requirements for the maintenance of LGJ-630 conductors. The pulling forces generated by hand-chain hoists and ordinary screw rods are too small, and only construction tools such as large-tonnage winches can be used for maintenance. This method of replacing insulators and insulator strings is time-consuming and laborious, and is limited by the power outage time and cannot perform live work.

[0004] Although there are similar tools for the maintenance of UHV transmission lines, their weight and size are too large, time-consuming and laborious to use, and the load redundancy is too large, resulting in poor economy. They are not compatible with the structural dimensions of LGJ-630 double-split conductors and fittings of 220kV lines and the original fixture dimensions. At the same time, there is a problem that different tools are required to replace the first and last pieces, single middle piece, several pieces to the entire string of insulators.

[0005] The problem of load transfer for LGJ-630 double-split conductors applicable to 220kV transmission lines urgently needs to be solved. A conductor load transfer tool applicable to the replacement of the entire string of strain insulators, single-piece insulators, and single or multiple pieces of insulators in suspension strings for LGJ-630 double-split conductors is required to effectively solve the demand for insulator string maintenance tools for LGJ-630 double-split conductors. Content of the Utility Model

[0006] The purpose of the utility model is to provide a load transfer tool for large cross-section conductors of transmission lines that generates a large and stable pulling force.

[0007] This large cross-section wire load transfer tool for transmission lines provided by the utility model includes a parallel screw rod assembly and tension plates and clamps connected to both ends thereof; the parallel screw rod assembly includes screw rods arranged in parallel, and bearing plates are fixed at both ends of the screw rods; the tension plates and the clamps are connected to the bearing plates; the clamps can clamp and fix the connecting plates at both ends of the insulator; the screw rod includes an inner screw rod and an outer screw rod sleeved inside and outside, a screw nut seat is fixedly arranged at the end of the outer screw rod, and the inner screw rod is threadedly connected with the screw nut seat; by rotating the outer screw rod to make the inner screw rod threadedly advance into the outer screw rod and the screw nut seat, the bearing plates can be tightened, driving the clamps at both ends to approach; of the bearing plates at both ends of the parallel screw rod assembly, one end is connected to the tension plate, and an end clamp is arranged at the end of the tension plate; the other end is connected to a large knife clamp; the outer ends of the end clamp and the large knife clamp are H-shaped clamping seats, and at least two fastening pieces for connecting with the connecting plates at both ends of the insulator are arranged on the clamping seats.

[0008] In an implementation manner of the above tool, the parallel screw rod assembly is a three-parallel screw rod assembly, including two sets of screw rod assemblies arranged oppositely, and the screw rod assembly includes a bearing plate, three inner screw rods and an outer screw rod and a screw nut seat arranged outside thereof.

[0009] In an implementation manner of the above tool, the inner screw rod is a slender solid straight rod with threads; the bearing plate is a triangular high-strength titanium alloy plate; the three inner screw rods are fixed at three corners of the bearing plate; the outer screw rod is a hollow long rod, and the screw nut seat is fixed at the end of the outer screw rod; the three outer screw rods are respectively sleeved at the outer ends of the respective inner screw rods, and the threads of the inner screw rods are engaged with the screw nut seats.

[0010] In an implementation manner of the above tool, a gear connecting rod is inserted and fixed between two opposite outer screw rods to connect and fix the two outer screw rods; a driven gear is fixed outside the gear connecting rod.

[0011] In an implementation manner of the above tool, driven gears are fixed on three groups of opposite outer screw rods, and at the central position of the three driven gears, a driving gear is provided, and the driving gear is engaged with each driven gear.

[0012] In an implementation manner of the above tool, the driving gear is connected to the driving structure of the turbine box, and the turbine box is simultaneously slidably connected to the three groups of outer screw rods.

[0013] In an implementation manner of the above tool, the driving structure of the turbine box is a turbine and worm structure, and the worm extends out of the turbine box.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. A new type of parallel screw rod assembly is provided, which is sufficient to generate the tension required for replacing the insulators of the transmission line and assist in completing the replacement of the insulators;

[0016] 2. Using this tool, various insulator string maintenance and replacement projects can be carried out, such as the replacement of the entire tension string of LGJ-630 double-split conductors, single insulator discs, and single or multiple insulator discs of suspension strings. This reduces the difficulty of insulator replacement, effectively ensures the safety of operators, reduces labor intensity, and improves work efficiency. Brief Description of the Drawings

[0017] Figure 1 It is an isometric structural schematic diagram of an embodiment of the present utility model.

[0018] Figure 2 It is Figure 1 the isometric structural schematic diagram of the three-parallel screw rod assembly in

[0019] Figure 3 It is Figure 2 the isometric structural schematic diagram of the turbine box removed.

[0020] Figure 4 It is Figure 2 the isometric structural schematic diagram of the inner screw rod, outer screw rod, screw nut seat, and gear connecting rod in

[0021] Figure 5 It is Figure 4 the isometric structural schematic diagram of the outer screw rod and gear connecting rod removed.

[0022] Figure 6 It is Figure 4 the isometric structural schematic diagram of the gear connecting rod in

[0023] Figure 7 It is a schematic diagram of the usage scenario of the transmission line insulator replacement tool in this embodiment. Detailed Embodiment

[0024] Next, the related technical solutions will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0025] As Figure 1 shown, the large-section conductor load transfer tool for transmission lines disclosed in this embodiment includes a three-parallel screw rod assembly 1, a pull plate 2, a large knife clamp 3, and an end clamp 4.

[0026] As Figure 2 and Figure 3 shown, the three-parallel screw rod assembly 1 includes an inner screw rod 11, an outer screw rod 12, a screw nut seat 13, a bearing plate 14, a gear connecting rod 15, a driven gear 16, a driving gear 17, and a turbine box 18.

[0027] As Figure 4 shown, the inner lead screw 11 is a slender solid straight rod with external threads. The load-bearing plate 14 is a triangular high-strength plate. The three inner lead screws are fixed at the three corners of the load-bearing plate.

[0028] As Figure 5 shown, the outer lead screw 12 is a hollow rod. The lead screw nut seat 13 is fixed at one end of the outer lead screw. The three outer lead screws are respectively sleeved at the outer ends of the respective inner lead screws 11, and the threads of the inner lead screws mesh with the lead screw nut seats. The other ends of the outer lead screws extend outwards.

[0029] A load-bearing plate, three inner lead screws and the outer lead screws wrapped around them form a set of lead screw assemblies. Two sets of lead screw assemblies are arranged oppositely, with their load-bearing plates at both ends and the outer lead screws facing each other.

[0030] As Figure 6 shown, a gear connecting rod 15 is fixedly inserted between two opposite outer lead screws 12 to connect and fix the two outer lead screws. A driven gear 16 is fixed outside the gear connecting rod.

[0031] Driven gears 16 are fixed on all three sets of opposite outer lead screws. At the central positions of the three driven gears, a driving gear 17 is arranged. The driving gear meshes with each driven gear and can drive each gear to rotate.

[0032] The driving structure of the turbine box 18 is connected to the driving gear and can drive the driving gear to rotate. The turbine box is also slidably connected to the three sets of outer lead screws to further limit the outer lead screws.

[0033] The driving structure of the turbine box is a worm and turbine structure, and the worm extends out of the turbine box. The worm can be rotated by applying an external force. The worm and the worm gear cooperate to make the driving gear rotate, and then drive the driven gears and the lead screws. This external force can be applied to the worm by a person swinging a rocker up and down, or an electric wrench can also be used.

[0034] After the turbine box drives the driving gear, the driving gear drives the three driven gears to rotate. The driven gears drive the corresponding outer lead screws to rotate. Due to the fixed connection between the outer lead screw and the lead screw nut seat, when the outer lead screw rotates, it drives the lead screw nut seat to rotate in the same direction, driving the inner lead screw meshing with the lead screw nut seat to jack up or retract, driving the displacement of the load-bearing plates at both ends of the inner lead screw.

[0035] For the load-bearing plates at both ends of the three parallel lead screw assemblies 1, one end is connected to the pull plate 2, and an end clamp 4 is arranged at the end of the pull plate; the other end is connected to the big knife clamp 3.

[0036] The pull plate 2 is a long solid plate, and the length of the pull plate can be adjusted according to the length of the strain insulator.

[0037] One side of the big knife clamp 3 is hinged to the load-bearing plate at one end of the three-parallel lead screw assembly 1; the other end is in an H shape, which can clamp one side plate of the strain insulator, and is fixedly connected by two bolts at the same time.

[0038] The structure of the end clamp 4 is similar to that of the big knife clamp 3. The difference is that: the front view shapes of the two are different. The end clamp is in a straight plate shape, and the big knife clamp is in a curved knife shape.

[0039] As Figure 7 shown, when using this tool, the big knife clamp and the end clamp respectively link and fix the side plates at both ends of the strain insulator. At this time, the strain insulator is stretched outward by the conductors at both ends; by contracting the three-parallel lead screw, the insulator string is unloaded, and the tension is transferred to the replacement tool, and the insulator string can be replaced.

[0040] When performing operations, a closed clamp also needs to be used for assistance. The closed clamp is a prior art. The closed clamp includes a front clamp, a rear clamp and a lead screw. The front clamp is located at the front end of the closed clamp and is responsible for connecting to the insulator steel cap and clamping the circular bayonet on the steel cap. The rear clamp is located at the rear end of the closed clamp, corresponding to the front clamp, and has a similar structure.

[0041] When using this tool to replace the entire string of strain insulators, the steps are as follows:

[0042] 1) First, fix the end clamp to the conductor side link plate, and then fix the big knife clamp to the cross-arm side link plate.

[0043] 2) First connect the big knife clamp connection tool at the conductor end to make the lengths of the 3 lead screws consistent, and then connect the insulating pull rod. The insulating pull rod is then connected to the front clamp of the big knife clamp at the cross-arm end to ensure the same length and uniform force.

[0044] 3) Then connect the lifting bracket above the fixture and the insulator support below the fixture.

[0045] 4) After the tool is stressed, the porcelain insulator on the conductor side is unloaded, and the replacement operation is carried out.

[0046] 5) Pass the new entire string of insulators to the operation site through the winch through the lifting bracket, and then lift it through the insulator support, place it at the replacement place, and install and apply force.

[0047] When using this tool to replace the insulator string on the conductor side, the steps are as follows:

[0048] 1) Fix the conductor end fixture to the conductor side link plate.

[0049] 2) Install the front clamp of the closed clamp on the fifth-sixth porcelain insulators, so that the front clamp of the closed clamp can only swing left and right with the porcelain insulator steel cap and cannot move back and forth.

[0050] 3) First, connect the wire end clamp tool to make the lengths of the 3 lead screws consistent, then connect the insulating pull rod, and the insulating pull rod is then connected to the front clamp of the closed clamp to ensure consistent length and uniform force.

[0051] 4) Then connect the lifting bracket above the clamp and the bottle supporting frame below the clamp.

[0052] 5) After the tool is stressed, the porcelain insulator on the wire side is unloaded and the replacement operation is carried out.

[0053] 6) Pass 5 - 6 new porcelain insulators to the operation location through the winch via the lifting bracket, then lift them through the bottle supporting frame, place them at the replacement location, and carry out installation and stress application.

[0054] When using this tool to replace the insulator string with a middle large porcelain insulator string, the steps are as follows:

[0055] 1) Connect the front clamp and the rear clamp of the closed clamp to the insulator string respectively, with a spacing of 5 - 6 insulators in the middle.

[0056] 2) Install the front clamp and the rear clamp of the closed clamp so that the rear clamp of the closed clamp can only sway left and right with the porcelain insulator steel cap and cannot move back and forth.

[0057] 3) Connect the front clamp of the closed clamp tool to make the lengths of the 3 lead screws consistent, then connect the insulating pull rod, and the insulating pull rod is then connected to the rear clamp of the closed clamp to ensure consistent length and uniform force.

[0058] 4) Then connect the lifting bracket above the clamp and the bottle supporting frame below the clamp.

[0059] 5) After the tool is stressed, the porcelain insulator on the cross arm side is unloaded and the replacement operation is carried out.

[0060] 6) Pass 5 - 6 new porcelain insulators to the operation location through the winch via the lifting bracket, then lift them through the bottle supporting frame, place them at the replacement location, and carry out installation and stress application.

[0061] When using this tool to replace the insulator string on the cross arm side, the steps are as follows:

[0062] 1) Fix the cross arm side end clamp to the cross arm side link plate.

[0063] 2) Install the rear clamp of the closed clamp on the fifth - sixth porcelain insulator so that the rear clamp of the closed clamp can only sway left and right with the porcelain insulator steel cap and cannot move back and forth.

[0064] 3) First, connect the cross arm end clamp tool to make the lengths of the 3 lead screws consistent, then connect the insulating pull rod, and the insulating pull rod is then connected to the front clamp of the closed clamp to ensure consistent length and uniform force.

[0065] 4) Then connect the lifting bracket above the clamp and the bottle supporting frame below the clamp.

[0066] 5) After the tool is stressed, the insulator on the cross-arm side relieves the stress and the replacement operation is carried out.

[0067] 6) Pass 5-6 new insulators to the operation site through a winch grinder via a lifting bracket, and then lift them through a bottle support frame, place them at the replacement site, and install them under stress.

[0068] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the foregoing embodiments have been described in detail, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A large cross-section wire load transfer tool for transmission lines, characterized in that: It includes a parallel screw rod assembly and the pull plates and fixtures connected to both ends thereof; The parallel screw rod assembly includes screw rods arranged in parallel, and bearing plates are fixed at both ends of the screw rods; the pull plates and the fixtures are connected to the bearing plates; the fixture can clamp and fix the connecting plates at both ends of the insulator; The screw rod includes an inner screw rod and an outer screw rod sleeved inside and outside, a screw rod nut seat is fixedly arranged at the end of the outer screw rod, and the inner screw rod is in threaded connection with the screw rod nut seat; by rotating the outer screw rod to make the inner screw rod screw into the outer screw rod and the screw rod nut seat, the bearing plate can be tightened, driving the fixtures at both ends to approach; The bearing plates at both ends of the parallel screw rod assembly, one end of which is connected to the pull plate, and an end clamp is arranged at the end of the pull plate; the other end is connected to the large knife clamp; the outer ends of the end clamp and the large knife clamp are H-shaped clamping seats, and at least two fasteners for connecting with the connecting plates at both ends of the insulator are arranged on the clamping seats.

2. The large cross-section wire load transfer tool for transmission lines according to claim 1, characterized in that: The parallel screw rod assembly is a three-parallel screw rod assembly, including two sets of screw rod assemblies arranged oppositely, and the screw rod assembly includes a bearing plate, three inner screw rods and the outer screw rod and the screw rod nut seat arranged outside thereof.

3. The large cross-section conductor load transfer tool for transmission lines according to claim 2, characterized in that: The inner screw rod is a long, thin, solid straight rod with threads; the bearing plate is a triangular high-strength titanium alloy plate; the three inner screw rods are fixed at three corners of the bearing plate; the outer screw rod is a hollow long rod, and the screw rod nut seat is fixed at the end of the outer screw rod; the three outer screw rods are respectively sleeved at the outer ends of the respective inner screw rods, and the threads of the inner screw rods are engaged with the screw rod nut seats.

4. The large cross-section conductor load transfer tool for transmission lines according to claim 2, wherein: A gear connecting rod is inserted and fixed between two opposite outer screw rods to connect and fix the two outer screw rods; a driven gear is fixed outside the gear connecting rod.

5. The large cross-section wire load transfer tool for transmission lines according to claim 4, characterized in that: Driven gears are fixed on all three sets of opposite outer screw rods, and at the central position of the three driven gears, a driving gear is provided, and the driving gear is engaged with each driven gear.

6. The large cross-section conductor load transfer tool for transmission lines according to claim 5, wherein: The driving gear is connected to the driving structure of the turbine box, and the turbine box is simultaneously slidably connected to the three sets of outer screw rods.

7. The large cross-section conductor load transfer tool for transmission lines according to claim 6, characterized in that: The driving structure of the turbine box is a turbine and worm structure, and the worm extends out of the turbine box.

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