crh EMU grounding device

Abstract

The invention relates to technical field of a motor train grounding device, in particular to a grounding device of a China railway high-speed (CRH) motor train unit. The grounding device comprises a carbon brush rack and a carbon brush assembly, wherein an installation ring is arranged at an outer edge of the carbon brush rack, a power connection sheet is arranged on the installation ring, the carbon brush assembly is arranged at a front side of the carbon brush rack, is connected with through holes in a matching way and is electrically connected with the power connection sheet, a plurality of groups of assembly holes and fixed bolts are arranged on the installation ring, an annular insulation cushion is arranged on a front side surface of the installation ring, each fixed bolt sequentially passes through the corresponding assembly hole and a fixed hole from a rear side of the installation ring, and an insulation sleeve is arranged between the fixed bolts and the assembly holes. The grounding device is reasonable in structure configuration, the carbon brush rack and a shaft box are independently installed and are isolated with each other, a carbon brush is in stable contact with a friction disc on an end surface of a vehicle shaft by support of a constant force spring, so that a grounding path is directly formed between the vehicle shaft and a vehicle wheel, and a bearing is prevented from being damaged; and moreover, the abrasion loss of the carbon brush can be effectively reduced through end-surface contact, the grounding device is convenient to install and maintain, and the grounding protection reliability is improved.

Description

technical field [0001] The invention relates to the technical field of grounding devices for motor trains, in particular to the grounding device for CRH trains. Background technique [0002] High-speed bullet trains have brought more convenience to social and economic development and people's travel, and safety performance is the basic guarantee for bullet train operation. Leakage prevention is an important part of the safety mechanism of the train. The current is transmitted to the train pump through the ground wire, and then the ground loop is formed through the wheels and rails, thereby eliminating the potential between the car body and the track, preventing working current, system fault current, Lightning current can cause damage to the vehicle and its occupants. The existing grounding device generally includes a grounding body, a carbon brush and a friction disc. The grounding body is installed on the axle box and is insulated from it. The friction disc is positioned t...

AI Technical Summary

Problems solved by technology

This kind of grounding device is relatively complicated in assembly and maintenance. Both the friction disc and the grounding body are arranged in the axle box. The cooperation between the friction disc and the bearing requires the positioning of the pressure plate. It is necessary to open the axle box during maintenance; the power connection circuit is from the ground wire of the car body, the ground body, the carbon brush, the friction disc, the bearing, the axle, the wheel to the rail, and the bearing in the circuit is easily damaged when a large current passes through, affecting the vehicle. security of operation

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