Metering device for a sand-spreading system of a rail vehicle

A metering device for a sand-spreading system of a rail vehicle, the metering device comprising:

• a housing block defining a sand feeding funnel, a sand mixing channel, a sand receiving space, a sand deflecting space and a vertical sand blowing-out channel, said housing block including a sand path extending from said sand feeding funnel into said vertical sand blowing-out channel via said sand mixing channel, said sand mixing channel rising from said sand receiving space in an inclined manner in relation to said sand deflecting space;
• a pushing air tube, protruding coaxially into said sand mixing channel from below, for producing an air stream for conveying spreading sand;
• a nozzle insert;
• and
• said housing block having an inflow channel opening out into said sand deflecting space from above, said nozzle insert being arranged for producing an air jet directed downward into said sand deflecting space and into said sand blowing-out channel, and wherein said nozzle insert is detachably fitted by insertion into said inflow channel, so that easy insertion of said nozzle insert into said inflow channel and similarly easy removal is allowed, and wherein said nozzle insert can be selected from a set of interchangeable nozzle inserts with differently dimensioned nozzle diameters in accordance with a grain size of the spreading sand used.