Fastening type sand box cover

Abstract

The invention discloses a fastening type sand box cover. The fastening type sand box cover comprises a cover body, the middle of the top of the cover body is provided with an overpressure protection device, which is fixedly connected with the cover body through an overpressure protection seat, inside the overpressure protection seat forms an exhaust channel, one end of the exhaust channel is communicated with the atmosphere, the other end of the exhaust channel is connected with a predischarging port, inside the exhaust channel is provided with an adjusting piece which is movably connected with one end of a pressure maintaining base through a spring, the other end of the pressure maintaining base is fixedly connected with a first sealing ring through a snap spring, and the first sealing ring can be in contact with the inner surface of a pressure maintaining mounting base to block the exhaust channel and the predischarging port or separated from the inner surface of the pressure maintaining mounting base to communicate the exhaust channel and the predischarging port. The fastening type sand box cover solves the problems that an existing sand box is large in operation space and failsto relieve pressure due abnormally excessive large internal pressure and the cover of the existing box is easy to slip off.

Description

technical field [0001] The invention belongs to the technical field of rail transit vehicles, and in particular relates to a buckle-type sand box cover. Background technique [0002] Rail transit vehicles use the traction and brake adhesion friction generated by the interaction between the wheel and rail to realize the operation of the train. The purpose of sanding is to use sand to increase the friction between the wheel and the rail surface, shorten the braking distance and increase the friction of climbing. . At present, the sand spreading device for EMUs generally adopts the differential pressure sand spreading device, and its principle is to blast the sand in the sand box to the rail surface through the pressure of compressed air. Due to its working characteristics, the differential pressure sand spreading device has an airtight requirement on the sand box cover to maintain the pressure in the sand box. [0003] At present, the generally used sand box cover is integra...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a buckle-type sand box cover, which solves the problems that the existing sand box cover has a large operating space, the pressure in the sand box is too high and the pressure cannot be released, and the sand box cover is easy to slip.

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