Piston speed modulation for a concrete pump

摘要

The invention concerns a concrete pump, of the type comprising a pair of pumping cylinders alternatively operating under the control of a backflow hydraulic pump - to draw concrete from a hopper and feed it, by way of a rocking valve (S-valve), into the transport and delivery duct - wherein said cylinders are provided with stops to control the starting movement of the S-valve. According to the invention, the speed of the piston stroke of said cylinders is modulated by being increased in the initial length of said stroke, and electronic means are provided to control said speed according to the maximum concrete capacity allowed by the pump. <IMAGE>