| 摘要 |
PURPOSE:To raise the efficiency of operations by speeding up the movement of link by a method in which when the discharge amount of a variable capacity oil-pressure pump to drive an actuator becomes nearly max. the value of speed signals coming from a speed indicator is limited. CONSTITUTION:The discharge amount of variable capacity oil-pressure pumps 1 and 2 is controlled by regulators 3 and 4 to be controlled by controller 18 which receives boom angle signal Ebeta and arm angle signal Ealpha and then sends out discharge amount command signals Etheta1 and Etheta2 to the regulators 3 and 4 by performing given calculations. When the values reach ones corresponding to nearly max. discharge amount of the pumps 1 and 2, the signals Etheta1 and Etheta2 are controlled in such a way as not to exceed the corresponding value of the max. discharge amount of the pumps 1 and 2. The cutting edge of the bucket 13 can thus be moved at a speed as high as possible for raising the efficiency of operations. |
