Sand adding device for sand scattering system of low-floor tramcar

The invention discloses a sand adding device for a sand scattering system of a low-floor tramcar. The sand adding device is characterized by comprising an upper sand loading pneumatic unit and a lower universal steering unit, wherein the upper sand loading pneumatic unit and the lower universal steering unit are fixed through welding, and the lower universal steering unit can rotate freely and be adjusted in height; the upper sand loading pneumatic unit comprises a sand loading hopper cavity, a sand loading guide pipe and an air pressure adjusting valve; the sand loading hopper cavity is of the structure that a hopper is welded to the upper portion of a U-shaped shell in a splicing mode and the sand loading hopper cavity is hollow; one end of the sand loading guide pipe is riveted to the sand loading hopper cavity, and the other end of the sand loading guide pipe can go deep into sand boxes of the sand scattering system of the tramcar; and the lower universal steering unit comprises a height-adjustable tripod