| 摘要 |
A hydraulic drive arrangement for a shear-type shredder includes an electrically operable control circuit, including a jam sensor external to the hydraulic fluid circuit, for sensing jamming conditions in the shredder and reversing the flow in the fluid circuit only when a true jamming condition is sensed. The jam sensor is located in the electrical power circuit to the electric motor driving the hydraulic fluid pump for sensing the load on the motor. An electric discriminator circuit responds to the sensor to distinguish between load changes due to true and momentary jamming conditions in the shredder. An actuator responsive to the discriminator actuates a flow-reversing valve in the hydraulic circuit to reverse fluid flow therein to reverse the shredder and thereby clear the jamming condition. The hydraulic fluid circuit, including a pressure relief valve, and the electric motor, dampen any abrupt changes in load due to momentary jamming conditions in the shredder so that they do not cause the discriminator to actuate the flow-reversing valve.
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