A supporting fitting of double-hanging-point double-connection suspension string and double-hanging-point double-connection suspension string

Abstract

This invention relates to a matching hardware for a double-point, double-connected suspension string. The hardware connects to a crossarm and includes an upper steel plate, a lower steel plate, and insulator string connectors. The upper and lower steel plates are bolted together to form a combined connecting plate, and the crossarm is bolted to the combined connecting plate. Two insulator string connectors are used, with each end of the upper steel plate connected to one of the two connectors. Both the upper and lower steel plates are flat, with the bottom plane of the upper steel plate fitting flush with the top plane of the lower steel plate. This invention also relates to a double-point, double-connected suspension string. This invention shortens the overall length of the suspension string structure, maintains electrical safety distances, and belongs to the field of power fittings technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power fittings, in particular to a double-hanging-point double-connection suspension string matching fitting and double-hanging-point double-connection suspension string. BACKGROUND

[0002] At the important intersectional crossing places of power transmission lines, such as railways, expressways and first-class highways, the horizontal bars of straight towers built in the early stage are generally in the shape of a pyramid. When line maintenance or countermeasures are taken, the single-hanging-point single-connection suspension string often needs to be changed into a single-hanging-point double-connection suspension string. The specific method is to connect the double-connection suspension insulator string by increasing a triangular connecting plate and a right-angle hanging plate, so as to improve the stability and safety of the line during operation.

[0003] When the old straight tower single-hanging-point single-connection suspension string is changed into a single-hanging-point double-connection suspension string, the triangular connecting plate and the right-angle hanging plate increase the length of the assembled string, resulting in that the electrical distance does not meet the safety requirements. The wires will discharge to the horizontal bar below and the surrounding tower materials, and there is a safety hazard. The original assembled string structure and matching fittings cannot be applied. SUMMARY

[0004] In view of the technical problems existing in the prior art, the purpose of the present application is to provide a double-hanging-point double-connection suspension string matching fitting which shortens the length of the entire suspension string structure and maintains the electrical safety distance.

[0005] Another purpose of the present application is to provide a double-hanging-point double-connection suspension string with high safety.

[0006] In order to achieve the above purposes, the present application adopts the following technical solutions:

[0007] A double-hanging-point double-connection suspension string matching fitting, the fitting is connected with a horizontal bar, comprising an upper steel plate, a lower steel plate and an insulator string connecting piece, the upper steel plate and the lower steel plate are connected by bolts to form a combined connecting plate, and the horizontal bar is connected with the combined connecting plate by bolts; the number of the insulator string connecting pieces is two, and the two ends of the upper steel plate are connected with the two insulator string connecting pieces respectively; the upper steel plate and the lower steel plate are both in the form of a flat plate, and the bottom plane of the upper steel plate is attached to the top plane of the lower steel plate.

[0008] As a preferred option, the upper steel plate and the lower steel plate are both rectangular flat plates or square flat plates.

[0009] As a preferred option, the upper steel plate and the lower steel plate are both made of hot-dipped galvanized steel or titanium alloy.

[0010] As a preferred option, all the bolts are of M16 type, all the bolts are provided with a screw hole, and the screw hole is located at the end of the nut; the screw hole is connected with a pin.

[0011] As a preferred option, the pin is an R-shaped pin.

[0012] As a kind of preferred, the nut connecting end of bolt is arranged from lower steel plate to upper steel plate, gasket is arranged between nut and upper steel plate, gasket is arranged between nut and cross arm.

[0013] As a kind of preferred, the thickness of gasket is 2mm.

[0014] As a kind of preferred, insulator string connector includes U-shaped screw, U-shaped hanging ring and ball head hanging ring, two straight rod sections of U-shaped screw are provided with thread, two straight rod sections of U-shaped screw are passed through upper steel plate and are fixed by nut connection;The arc section of U-shaped hanging ring and the arc section of U-shaped screw are mutually buckled, to connect the straight rod section of ball head hanging ring and U-shaped hanging ring.

[0015] As a kind of preferred, cross arm includes vertical section and horizontal section, vertical section and horizontal section are integrally arranged, vertical section and horizontal section are perpendicular to each other, vertical section is arranged towards the direction away from upper steel plate;Horizontal section is parallel to upper steel plate, horizontal section is connected with upper steel plate by bolt.

[0016] A double-hanging-point double-connection suspension string includes two insulator strings, a suspension clamp and a matching hardware for double-hanging-point double-connection suspension string, one end of each of the two insulator strings is connected with an insulator string connector, and the other end of each of the two insulator strings is fixed with a wire through the suspension clamp.

[0017] Overall, the present application has the following advantages:

[0018] The present application uses a combined connecting plate to replace the original triangular connecting plate and right-angle hanging plate, greatly reduces the length of the assembled string (the structural length is reduced by 153 mm) increased due to the conversion of the single-hanging-point single-connection suspension string of the angle pyramid cross arm into a single-hanging-point double-connection suspension string, so that the air gap of the wire to the tower meets the safety requirements. At the same time, by using the matching hardware, the single-hanging-point double-connection suspension string is converted into a double-hanging-point double-connection suspension string, the single-point stress is converted into two-point stress, the load bearing is larger, the connection is more reliable and more secure. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a front view of a matching hardware for a double-hanging-point double-connection suspension string,

[0020] Figure 2 It is a bottom view of a matching hardware for a double-hanging-point double-connection suspension string.

[0021] Figure 3 It is a front view of a double-hanging-point double-connection suspension string.

[0022] Among them, 1 is the upper steel plate, 2 is the lower steel plate, 3 is the crossarm, 4 is the bolt, 5 is the pin, 6 is the washer, 7 is the U-bolt, 8 is the U-shaped hanging ring, 9 is the ball head hanging ring, 10 is the nut, 11 is the matching hardware, 12 is the insulator string connector, 13 is the insulator string, and 14 is the suspension clamp. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to specific embodiments.

[0024] A matching fitting for a double-point, double-connected suspension string, the fitting connecting to the crossarm, includes an upper steel plate, a lower steel plate, and insulator string connectors. The upper and lower steel plates are bolted together to form a combined connecting plate, and the crossarm is bolted to the combined connecting plate. Two insulator string connectors are used, with each end of the upper steel plate connected to one of the two connectors. Both the upper and lower steel plates are flat, with the bottom plane of the upper steel plate fitting flush with the top plane of the lower steel plate. The use of upper and lower combined connecting plates increases tensile strength. Due to the short spatial structure of the upper and lower steel plates, the overall length of the suspension string is reduced, ensuring that the electrical distance between the upper and middle phase conductors and the crossarm below meets safety requirements.

[0025] Both the upper and lower steel plates are rectangular or square flat plates. In this embodiment, both the upper and lower steel plates are rectangular flat plates.

[0026] Both the upper and lower steel plates are made of hot-dip galvanized steel or titanium alloy. In this embodiment, both the upper and lower steel plates are made of hot-dip galvanized steel.

[0027] All bolts are M16 type (nominal load not less than 70kN), and all bolts are provided with threaded holes located at the end extending out of the nut; the threaded holes are connected with pins to prevent the nuts from loosening and falling off.

[0028] The pins are R-type pins.

[0029] The nut connection end of the bolt is set from the lower steel plate toward the upper steel plate, and a washer is provided between the nut and the upper steel plate, and a washer is provided between the nut and the crossbeam.

[0030] The thickness of the gasket is 2mm.

[0031] The insulator string connector includes a U-bolt, a U-shaped hanging ring, and a ball-head hanging ring. Both straight sections of the U-bolt are threaded and pass through the upper steel plate and are fixed by nuts. The arc-shaped section of the U-shaped hanging ring interlocks with the arc-shaped section of the U-bolt to connect the ball-head hanging ring and the straight section of the U-shaped hanging ring of the insulator string.

[0032] The crossarm consists of a vertical section and a horizontal section, which are integrated and perpendicular to each other. The vertical section is oriented away from the upper steel plate, while the horizontal section is parallel to the upper steel plate and is connected to the upper steel plate by bolts.

[0033] A double-suspension-point double-connection suspension string includes two insulator strings, suspension clamps, and matching hardware for the double-suspension-point double-connection suspension string. One end of each of the two insulator strings is connected to a connecting piece for each insulator string, and the other end of each insulator string is fixed to the conductor via the suspension clamp. In this embodiment, one end of each of the two insulator strings is connected to the conductor via the suspension clamp, and the other end of each insulator string is connected to the crossarm via the connecting piece and the combined connecting plate. Because the overall structural length of the matching hardware is reduced, the conductors located in the upper and middle phases will not discharge onto the crossarm below due to the increased assembly string length caused by converting the pyramidal crossarm single-suspension-point single-connection suspension string into a single-suspension-point double-connection suspension string, thus ensuring the safety of the line.

[0034] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A matching fitting for a double-hung double-suspension string, the fitting being connected to a cross arm, characterized in that: The upper steel plate and the lower steel plate are connected by bolts to form a combined joint plate, and the cross arm is connected with the combined joint plate by bolts; the number of the insulator string connecting pieces is two, and the two ends of the upper steel plate are connected with the two insulator string connecting pieces respectively; the upper steel plate and the lower steel plate are both flat plates, and the bottom plane of the upper steel plate is attached to the top plane of the lower steel plate; ​ The insulator string connecting piece comprises a U-shaped screw, a U-shaped hanging ring and a ball head hanging ring, the two straight rod sections of the U-shaped screw are both provided with threads, and the two straight rod sections of the U-shaped screw are both penetrated through the upper steel plate and connected and fixed by nuts; the arc section of the U-shaped hanging ring is buckled with the arc section of the U-shaped screw, so as to connect the ball head hanging ring of the insulator string and the straight rod section of the U-shaped hanging ring; The cross arm comprises a vertical section and a horizontal section, the vertical section and the horizontal section are integrally arranged, the vertical section and the horizontal section are perpendicular to each other, and the vertical section is arranged towards the direction away from the upper steel plate; the horizontal section is parallel to the upper steel plate, and the horizontal section is connected with the upper steel plate by bolts.

2. The matching hardware for the double-hung double-suspension string according to claim 1, characterized in that: The upper steel plate and the lower steel plate are both rectangular plates or square plates.

3. The matching hardware for the double-hung double-suspension string according to claim 2, characterized in that: The upper steel plate and the lower steel plate are both made of hot-dipped galvanized steel or titanium alloy.

4. The matching hardware for the double-hung double-suspension string according to claim 1, characterized in that: All the bolts are M16 type, all the bolts are provided with screw rod holes, and the screw rod holes are located at the end of the nut; the pin is connected with the screw rod hole.

5. The matching hardware for the double-hung double-suspension string according to claim 4, characterized in that: The pin is an R-shaped pin.

6. The matching hardware for the double-hung double-suspension string according to claim 4, characterized in that: The nut connecting end of the bolt is arranged from the lower steel plate towards the upper steel plate, a gasket is arranged between the nut and the upper steel plate, and a gasket is arranged between the nut and the cross arm.

7. The matching hardware for the double-hung double-suspension string according to claim 6, characterized in that: The thickness of the gasket is 2 mm.

8. A double hanger, double gang pendant string, characterized by: The matching fitting of the double-hanging-point double-joint suspension string comprises two insulator strings, a suspension clamp and the double-hanging-point double-joint suspension string of any one of claims 1-7, one end of each of the two insulator strings is connected with the two insulator string connecting pieces respectively, and the other end of each of the two insulator strings is fixed with a wire through the suspension clamp.

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