SU838839A1 - High-voltage current collector - Google Patents

Description

(54) HIGH VOLTAGE CURRENT

one

This invention relates to high voltage collector devices, namely the design of current collectors installed, in particular on powerful excavators, and designed to transmit electricity from a cable connected to a fixed central axle of an excavator, to electrical equipment located on the rotary part of an excavator.

A high voltage current collector is known for transmitting electric power from a stationary to a rotary part of an excavator, comprising a contact assembly with fixed and movable contacts, the latter being mechanically connected to an insulating column mounted on the rotary part of an excavator 1.

However, in this current collector, the specified mechanical connection is made rigidly by means of a square-shaped driver mounted on the insulating column and a plug mounted on the movable contact. The stiffness of this mechanical connection is the reason for the dynamic loads that occur when an excavator is operating, operating in different planes when the excavator rolls and trim.

transferred to the contact node, which leads to increased wear of its elements and, accordingly, to the short service life of the current collector.

Closest to the proposed

the technical essence and the achieved result is a current collector, in which the mechanical connection between the insulating column and the moving contact of the current collector is made less rigid, by means of a convex body of rotation fixedly mounted on the insulating column and in contact with it at one point of spring-loaded plates connected through plug with pin 2.

However, with rolls, trimments, tracks and vibrations, in the conditions of which the excavator operates, in this current collector there is a slip of a fixedly fixed convex body of rotation relative to the spring-loaded plates. At the same time, the forces of friction sliding arising in this node

Claims (2)

This contributes to the wear of the material of the contacting parts (convex body and spring-loaded plates), turning the point contact into a planar contact, which increases the rigidity of the mechanical connection and adversely reflects on the wear resistance of the contact unit. The sliding friction forces themselves are transmitted through a mechanical connection to the contact node, exposing it to additional parasitic loads, which also reduces its wear resistance and reduces the service life of the current collector as a whole. The purpose of the invention is to increase the durability of the device. This goal is achieved by the fact that in a known current collector comprising a contact assembly with fixed and movable contacts, the latter of which is mechanically connected to the insulating column mounted on the rotatable part of the machine, through the convex body of the seat, which is in contact with the spring-loaded shaft. the convex body is mounted rotatably around its longitudinal axis by means of a bearing, e.g. a rolling bearing. The specified bearing may be located in the zone of maximum cross section of the body of rotation. FIG. 1 depicts a high voltage current collector; in fig. 2 is a view A of FIG. 1. The current collector has a contact assembly 1 mounted on a non-moving center axle of an excavator (not shown) and an insulating column 2 mounted on a turntable 3. Contact assembly 1 includes a fixed contact — a ring 4, a movable contact — a ring 5 and located between circumferentially, the contact rollers 6 with springs 7, which provide contact pressure for the current to transfer from the sliding contact 4 to the moving contact 5. The mechanical connection of the current collector consists of a convex body of rotation 8 mounted on a finger 9 using a rolling bearing 10. Finger 9 is fixedly mounted on the bracket 11 of the insulating column 2 fixed to the bracket of the turntable 3. The convex body of rotation 8 is located between the spring-loaded plates 12 mounted in the fork 13, which is fixed on the moving contact 5 of the current collector. The bearing 10 is mounted on the finger 9 and fixed on it by a ring 14, and the convex body 8 is fixed on the bearing by a ring 15. The bearing 10 is located in the zone of the largest cross section of the convex body 8. When the excavator platform 3 turns, the column 2 with the convex body 8 moves on it, mounted on the finger 9 by means of the support 10. The convex body 8 through the spring-loaded plates 12 of the plug 13, mounted on the movable contact 5, rotates this contact in the direction of movement of the platform. When the excavator is operating under conditions of heel, trim, three, vibrations, etc., there is a vertical and angular displacement of the insulating column 2 relative to the spring-loaded plates B. Due to the fact that the body 8 can rotate around the axis of the finger 9, it rolls over the plates 12, thereby reducing to a minimum the erasure of the contacting surfaces, as this changes the place of contact of the convex body with the spring-loaded plates during operation, thereby maintaining for a long time the point contact between these parts and the resulting elasticity of the mechanical connection. Replacing the sliding friction in this unit by rolling friction reduces respectively the parasitic forces acting on the contact node and thereby reduces its wear. Reducing the wear of the mechanical connection elements and the contact assembly provides an increase in the life of the current collector as a whole. Claims I. A high-voltage current picker for transmitting electricity from a stationary to a rotating part of a machine, preferably an excavator, contains a contact assembly with fixed and moving contacts, the latter mechanically connected to an insulating column mounted on the turning part by means of a convex body of rotation, contiguous with spring plates, characterized in that, in order to increase durability, said convex body is rotatably mounted around its extension axis through a bearing, e.g. a rolling bearing. 2. A current collector according to claim 1, characterized in that the bearing is located in the zone of the largest section of the convex body. Sources of information taken into account for the examination 1.Electrotechnical industry. Publishing house "Informelectro. 1976, No. 1, p. 15 - 16. 2. USSR author's certificate for application No. 2485587 / 24-07, cl. H 01 R 39/28, 1977. 2.2