RU36094U1 - Butt clamp for contact wires (options) - Google Patents

Description

JOINT CLAMP for CONTACT ACTUATORS (OPTIONS)

The utility model relates to the field of electrification of railways, in particular to butt clamps for contact suspension wires, providing mechanical and electrical connection of contact wires.

When designing contact networks of modern high-speed railways, stringent requirements are laid down, such as increasing the service life of up to 50 years, while reducing the frequency of maintenance under conditions of increasing current loads.

In high-speed suspensions, particularly high demands on electrical conductivity and weight reduction are imposed on conductive clamps mounted on contact wires.

Known butt clamp containing two main cheeks and two additional cheeks. Using bolts, the main cheeks with their locking protrusions with a notch compress the joined wires with the simultaneous pressing of additional cheeks to them 1

In another known clamp, the housing is detachable with external and

internal parallel plates of two dissimilar metals having holes for bolt fasteners. The inner plate is made of partitioned metal of high electrical conductivity and is equipped with at least two end sections from the metal of the external plates. The outer plates are made with longitudinal recesses, and the inner one with a longitudinal bend matching in shape with the connected elements. The mutually reversed sections of the inner plate have adjacent sawtooth protrusions 2 adjacent to each other and contacting on the surface

Known clamps are quite difficult to manufacture and operate, because they contain many parts of complex shape.

Known butt clamp of contact wires of the housing, which is made of BrAZH 9-4 in the form of two detachable dies, fastened with bolts and nuts, and equipped in the upper part with an eyelet with a hole. The clamp is designed for joining contact wires with a cross-sectional area of 85-120 mm sq. 3.

in 60 m 1/24

Known clip contains a large number of parts, inconvenient in operation and has a large weight.

A butt clamp is also known, described in 4 selected as a prototype.

The clamp contains a housing made of BrKN1-3, in the form of two dies, bolted to locknuts. In each of the dies, one smooth and one threaded hole is made. The clamp according to the invention described in 4 has a lower weight compared to the clamp specified in 3. However, both analogues, as well as the others listed above, have the following disadvantages:

bulkiness of the design, a large number of parts;

threading is required in each die;

the complexity of operation, requiring periodic tightening of bolted joints;

the required electrical conductivity of the clamp is achieved by increasing the contact spot, which leads to an increase in mass, dimensions of the clamp and increased consumption of materials;

due to an increase in the mass of the clamps, the load on the contact wires increases.

The task of the invention is to simplify the design of the butt clamp, simplify operation while maintaining high electrical and mechanical properties of the junction of the contact wires and, accordingly, increase the reliability of the contact suspension.

The technical result is achieved in that in the butt clamp for contact wires, including a metal case, the latter is made of an alloy with a shape memory effect in the form of a half-sleeve with a cross section that is a bracket, the distance between the ends of the pharynx is less than the distance between the longitudinal contact grooves intended for fastening wires, while the pharynx of the bracket is made in such a way as to ensure the closest approximation of its internal circuit to the external circuit of the contact wires being connected, and ektroprovodnost housing at least the electrical conductivity of the contact wire. The optimum ratio of the length of the clamp body to its width corresponds to the dependence 1 / d (6 ... 7): 1, where 1 is the length of the body, mm, and d is the width of the body, mm Alloys are used as an alloy with a shape memory effect, the temperature range whose phase transformation does not coincide with the temperature range

operation of the contact network (-40 ° С -; - + 50 ° С). Examples of these alloys are various grades of titanium nickelide alloy - TH-10, TH-1A, etc., alloys of the Fe-Ni-Fe system, Cu-Mn-Al, etc.

An alloy with a shape memory effect should have the necessary complex of physicomechanical properties and high electrical conductivity, ensuring equality of electrical conductivity of the clamp and the contact wire.

In the case where the conductivity of the clamp housing is lower than the conductivity of the contact wire, the clamp is provided with an insert of a material with high electrical conductivity, for example, copper. The insert is made with a length equal to the length of the housing and is installed in the housing above the joined wires, while the inner contour of the throat of the bracket is made in response to the cross section of the insert in conjunction with the cross section of the contact wire.

To increase the electrical conductivity, the housing can be equipped with conductive longitudinal gaskets fixed to the outer part of the housing (by gluing, welding, fixed in grooves and other suitable methods).

To prevent slipping, the housing at the points of contact with the conductive wires along the entire length of the housing is made with an abrasive coating, the abrasive particles of which, if it is necessary to increase the electrical conductivity, are made electrically conductive. The coating can be applied by electroplating, spraying or other suitable method.

In places of contact with abutting wires, the entire length of the housing can be transverse corrugation, for example in the form of teeth of a triangular or other suitable profile, which is also aimed at eliminating slippage.

The invention is illustrated by drawings, which show:

In FIG. 1 butt clamp for contact wires with longitudinal gaskets (isometric view), general view.

In FIG. 2, the same, view of the end face of the clamp body after cooling and deformation before assembly.

Figure 3, the same, view of the end face of the clamp housing when heated

In Fig.4, the same, view of the end face of the clamp housing after assembly.

In FIG. 5, the same, view of the end face of the body of the clamp, made with an abrasive coating.

The clamp of the butt contact wires consists of a housing 1 made of an alloy with a shape memory effect with a cross-section in the form of a bracket, the distance between the ends of the pharynx is less than the distance between the longitudinal grooves 2 and 3 of the contact wires 4 and 5 intended for fastening. The copper insert 6 is placed in the throat of the bracket, its inner contour is made reciprocal to the cross section of the liner in conjunction with the cross section of the contact wire. The housing 1 along the contact surfaces 7 and 8 with abutting wires 4 and 5 is made with an abrasive coating 9 containing abrasive particles, such as diamond particles, boron carbide.

To ensure better electrical conductivity of the clamp, the housing 1 can be equipped with transverse and longitudinal gaskets 10 mounted on the outer surface of the housing part 1, which ensure the electrical conductivity of the clamp is not less than the electrical conductivity of the contact wires 4 and 5. In the housing 1, transverse corrugation is made in the places of contact with the joined wires in the form of teeth 11 of a triangular profile. As a result of assembly, the corrugation increases the reliability of the clamp due to better contact with the contact wires.

The operation of the device is as follows.

When executing a housing made of titanium nickelide, housing 1 with an insert 6 (if necessary) is placed in liquid nitrogen or liquefied air and cooled to

design temperature with simultaneous deformation, ensuring the operation of the clamp.

If the device contains an insert, then before assembly it is heated to, the ends of the throat of the bracket are parted and placed in the housing 1 of the clamp. In the process of cooling, the clamp takes its original shape and tightly compresses the contact wires 4 and 5.

The abrasive coating 9 provides adhesion of the housing 1 to the contact wires 4 and 5, the same function is performed by the corrugation 11. Conductive gaskets 10 serve to increase the electrical conductivity of the clamp, if necessary.

Sources used in compiling the description:

1.A.S. USSR 1743939, B 60 M 1/24 dated 13.06.90

2.A.S. USSR 1754909, B 60 M. 1/24 from 10.29.90

3. Contact network and overhead lines. Regulatory and methodological documentation for the operation of the contact network and high-voltage overhead lines. Reference .M. Ministry of Railways. 2001 p. 208 4. Certificate of the Russian Federation for utility model No. 15563, B 60 M 1/24 dated 8.02.00 - prototype

Claims (15)

1. A butt clamp for contact wires, including a metal casing, characterized in that the latter is made of an alloy with a shape memory effect in the form of a half-sleeve with a cross section representing a bracket, the distance between the ends of the pharynx of which is less than the distance between the longitudinal grooves of the contact wires intended for fastening , while the pharynx of the bracket is made in such a way as to ensure the closest approximation of its inner contour to the outer contour of the joined wires, and the conductivity of the housing from alloy a shape memory effect of not less than the electrical conductivity of the trolley wire. 2. The butt clamp for contact wires according to claim 1, characterized in that the ratio of the length of the housing to its width corresponds to the following relationship: l / d = (6-7): 1, where l is the length of the body, mm; d - housing width, mm. 3. The clamp according to claim 1 or 2, characterized in that the housing at the points of contact with the joined wires is made with an abrasive coating. 4. The clamp according to claim 3, characterized in that the abrasive coating is made with particles of diamond or silicon carbide. 5. The clamp according to claim 3, characterized in that the abrasive coating is conductive. 6. The clamp according to any one of claims 1 to 5, characterized in that the housing is equipped with conductive longitudinal gaskets mounted on the outer surface of the housing. 7. The clamp according to any one of claims 1 to 6, characterized in that the transverse corrugation is additionally performed in the housing along its entire length at the points of contact with the joined wires. 8. The clamp according to claim 7, characterized in that the transverse corrugation is made in the form of teeth of a triangular profile. 9. A butt clamp for contact wires, including a metal casing, characterized in that the latter is made of an alloy with a shape memory effect in the form of a half-sleeve with a cross-section that is a bracket, the distance between the ends of the pharynx is less than the distance between the longitudinal grooves of the contact wires intended for fastening , and is additionally equipped with a liner made of an electrically conductive material with a length equal to the length of the housing, and installed in the housing above the abutting contact wires, while inside the vertical contour of the throat of the bracket is made in response to the cross section of the liner in conjunction with the cross section of the contact wire. 10. The clamp according to claim 9, characterized in that the housing at the points of contact with the joined wires is made with an abrasive coating. 11. The clamp according to claim 10, characterized in that the abrasive coating is made with particles of diamond or silicon carbide. 12. The clamp according to claim 10, characterized in that the abrasive coating is conductive. 13. The clamp according to any one of paragraphs.9-12, characterized in that the housing is equipped with conductive longitudinal gaskets mounted on the outer surface of the housing. 14. The clamp according to any one of paragraphs.9-13, characterized in that the transverse corrugation is additionally performed in the housing along its entire length at the points of contact with the joined wires. 15. The clamp according to 14, characterized in that the transverse corrugation is made in the form of teeth of a triangular profile.