HYDRAULIC DRIVE FOR WEIGHING-OUT AND LEVELLING CARGO PLATFORM Russian patent published in 1999 - IPC

FIELD: weighing-out and levelling cargo-platforms. SUBSTANCE: drive includes two pairs of hydraulic supports 10 mounted in corners of platform, hydraulic locks connected with piston chambers of hydraulic supports by means of above-valve chambers, two pumps connected with piston and rod chambers of respective pair of hydraulic supports and with control chambers of hydraulic locks, three three-position four-line distributors, tanks ands flow divider brought in communication with under-valve cavities of hydraulic locks of first pair of hydraulic supports. Rod chambers of first pair of hydraulic support, chambers of hydraulic locks of this pair of hydraulic support and divider are connected with one pump and tank through first distributor. Other pump is brought in communication with tank through inlet and drain holes of second and third distributors. Outlet holes of second distributor are connected with rod chambers of second pair of hydraulic supports, as well as with chambers and under-valve cavities of hydraulic locks of this pair of hydraulic support. Each outlet hole of third distributor is connected with chamber of hydraulic lock which is connected in its turn with one hydraulic support of second pair and with piston chamber of hydraulic support located diagonally through check valve. Outlet holes of second distributor are disconnected from drain and inlet holes. Throttle valve communicated with tank is connected to chambers of hydraulic locks of second distributor are disconnected from drain and inlet holes. Throttle valve communicated with tank is connected to chambers of hydraulic locks of second pair of hydraulic supports. EFFECT: enhanced reliability; reduced mass, overall dimensions and cost. 4 cl, 1 dwg