CONCRETE PUMP Russian patent published in 1998 - IPC

FIELD: civil engineering; pumping of concrete mixes and mortars. SUBSTANCE: pump has intake hopper 1 with bottom 2 and screw agitator 3. Hydraulic cylinders 10 and 11 of distributing device are secured coaxially on two working cylinders 4 and 5 whose pistons 6 and 7 are connected by rods 8 and 9 with pistons of power cylinders. Pistons 12 and 13 with hollow rods 14 and 15 are installed inside hydraulic cylinders for displacement along housings of working cylinders 4 and 5. Cylinders 10 and 11 of distributing device are provided with holes to feed working fluid into rod and rodless spaces. Special seals provide sealing of distributing device. V-shaped branch pipe with hoses 16 and 17 connected with concrete conduit 18 is installed coaxially with working cylinders 4 and 5 on opposite wall of hopper 1. Hoses 16 and 17 of V-shaped branch pipe are provided with check valves 19 and 20 with stops 21 and 22. EFFECT: enlarged operating capabilities.