Drive unit for conveyor system, has first hydraulic piston-cylinder connected in series with pneumatic piston-cylinder, pressure-dependent valve in each equalization line opposed to valve in other line

摘要

The device has at least two synchronous dual action hydraulic piston-cylinders (1.2,2.2) with flow interconnections so that the inlet or outlet of one can be alternatively connected to the outlet or inlet of another via flow lines. The first piston-cylinder is driven via its piston rod (1.4). A first hydraulic piston-cylinder is connected in series with a pneumatic piston-cylinder (1.3) via their piston rods, two flow lines (S1,S2) connecting the hydraulic piston-cylinders can be short circuited by at least two equalization lines (A1,A2) and a pressure-dependent throughway valve (3.1,3.2) is arranged in each equalization line that is opposed to the valve in the other line.