| 摘要 |
load-lifting facilities. SUBSTANCE: invention relates to load - lifting equipment and it can be used in hydraulic drives of outriggers. Proposed hydraulic drive has pump 1, hydraulic distributor 3, beam extension hydraulic cylinders 13 equipped with pilot-controlled check valve 7, normally closed electrically controlled hydraulic distributors 10 in extension main lines of jacks 38 and beams, control devices, drain system of electrohydraulic distributors 10 connected with tank 35. drain system of electrohydraulic distributors 10 is provided with four check valves 9, one valve in each main line 29 connecting drain space of electrohydraulic distributor with rod space of outrigger extension hydraulic cylinder 13. rod spaces of outrigger extension hydraulic cylinders 13 are connected through controlled valve with tank. Controlled valve is driven by cam installed in beam of any of four outriggers engaging with rod of valve with outrigger in extreme extended position. EFFECT: simplified design owing to dispensing with movable hoses and pipelines in connection of drain of distributor with tank, thus precluding tear off of movable hoses at extension and retraction of outriggers. 3 dwg
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