FILTER PRESS

Disclosed is a filter press for removing water from sludge, which is generated when washing a concrete mixer truck or the like and which contains cement and sand, by means of a number of filter plates, which are arranged on edge and facing each other. Sludge is passed under pressure through the inside of each filter plate, thereby filtering out the water contained therein. The filter press comprises a horizontal track arranged above the filter plates and a carriage adapted to travel upon this horizontal track. The carriage is equipped with a vertical operation cylinder. Provided in the lower section of the vertical operation cylinder are a separating rod for separating adjacent filter plates from each other and nozzles for injecting water under pressure for washing the outer periphery of each filter plate. The carriage is further equipped with a reverse-washing operation cylinder, to the lower end of which is connected a reverse-washing water-supply pipe for supplying water under pressure into each filter plate.