A sealing structure and sealing method for rail transit sand adding device

Abstract

The invention provides a sealing structure used for a track traffic sand feeding device. The sealing structure comprises an air cylinder installation seat, an air cylinder vertically arranged on the air cylinder installation seat, a packing door which is arranged at the bottom end of a piston rod of the air cylinder and can open and close a connecting channel between a sand storage tank and a transmitting cylinder through the axial movement, an air bag installation seat annularly arranged at the position of a sand inlet in the top of the transmitting cylinder, and an air bag arranged in the inner wall of the air bag installation seat in an embedded manner. The upper portion of the air bag installation seat extends for a distance in the radial direction and an annular protruding end is formed. Through tight attaching of the packing door and the protruding end, continuous flow of sand can be stopped, and axial sealing is achieved. Through inflation expansion of the air bag, the outer arc face of the air bag is tightly attached to the inner wall of the air bag installation seat, the inner arc face of the air bag is tightly attached to the edge of the packing door in the radial direction, and radial sealing of the connecting channel between the sand storage tank and the transmitting cylinder is achieved. The sealing structure is simple and good in sealing effect, and abrasion of the air bag by the sand is avoided in a secondary sealing manner.

Description

technical field [0001] The invention relates to the field of rail transit equipment, in particular to a sealing structure and a sealing method for a rail transit sand adding device. Background technique [0002] During the braking process of rail vehicles, sometimes it is necessary to actively increase the friction between the locomotive wheel and the track to obtain a better braking effect. A common method is to install multiple sand spreaders beside the locomotive wheel. Due to the limitation of the load of the locomotive and the space at the bottom, the sand storage capacity of the sand spreader cannot be too large. Therefore, when the locomotive is overhauled and maintained, it is often necessary to add sand to the sand spreader. At present, the technology of adding sand to vehicles in China is mainly based on artificial sanding, which requires a long time, low efficiency, high labor costs, and the pouring process is not fine enough, especially when sanding some high-pos...

AI Technical Summary

Problems solved by technology

The scheme has the following disadvantages: 1. The action of the floating ball is not subject to human control, and the sand material enters the sand shooting cylinder from the sand hopper without interruption when sandblasting is not performed; During the process, it is easy to spin due to the action of high-speed airflow, which affects the sealing; 3. The sand material will cause long-term wear on the surface of the floating ball during the falling process, affecting the sealing and service life of the floating ball

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