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1. 发明专利

JPH1025762A CRUSHER FOR CONCRETE, AND THE LIKE 失效
公开(公告)号：JPH1025762A
公开(公告)日：1998-01-27
申请号：JP19976596
申请日：1996-07-10
申请人： MITSUI SHIPBUILDING ENG , TOUDEN KOGYO KK
发明人： TSUBOKAWA HITOSHI , OHASHI HIROTAKA , MIHASHI ICHIRO , TAKEUCHI TAKIO
IPC分类号： E02F3/36 , B02C1/00 , B02C21/02
摘要： PROBLEM TO BE SOLVED: To stabilize crushing reaction by holding the pushing-in thrust of a breaker to a substance to be crushed at set pressure, interrupting an oil passage by the differential pressure of the primary-side pressure and secondary-side pressure of a push-in cylinder and obstructing the sudden change of the push-in movement of the breaker. SOLUTION: A breaker 40 is supplied with a hydraulic fluid and crushing thrust is given by a push-in cylinder 24, and pushing-in thrust supplies the head- side oil pressure chamber 44 of the cylinder 24 with oil pressure. Supply pressure to the cylinder 24 is adjusted at set pressure through a balancing valve 50 in the supply of oil pressure at that time, and works so as to give constant pushing-in thrust to the breaker 40. Consequently, the pushing-in reaction of the breaker 40 is received by crusher itself, and reaction is held constant and the stability of operation is ensured even when the crusher is loaded on a small- sized construction equipment. When a differential-pressure driving valve 60 is disposed on the outlet side of a rod-side oil pressure chamber 56, a discharge oil passage 58 is interrupted at front-rear differential pressure and an object is punched by a chisel 42, the crusher is shut down automatically at the time of emergency. Accordingly, the safety of crushing operation can be improved.

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