Speed-responsive reversing hydraulic drive for rotary shredder

Details Speed-responsive reversing hydraulic drive for rotary shredder Speed-responsive reversing hydraulic drive for rotary shredder

1982-05-24

1988-12-27

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

With automatic control

2411012, 241236, B02C 2500

Patent

active

047935618

ABSTRACT:
A hydraulic drive for a rotary shredder includes a rotation-actuated electric reversing control. Such control includes a rotation sensor positioned on one of the rotational elements of the drive: one of the cutter shafts, the hydraulic drive motor shaft or the hydraulic pump motor shaft. An RPM monitor circuit receives a signal from the rotation sensor and measures rotational speed to determine existence of a stoppage or slowing of the shaft corresponding to a jamming condition. This circuit monitors shaft speed over discrete time intervals and discriminates between momentary jamming conditions by determining the duration of low shaft speed conditions. The circuit transmits a jam signal to a reversal actuator circuit upon detection of a subnormal shaft speed persisting longer than the predetermined time interval. The reversal actuator circuit includes a timer and reverse and forward solenoids on a flow-reversing valve for briefly reversing fluid flow to the hydraulic motor when a jam signal is received. Monitoring rotation at the pump motor enables the hydraulic fluid circuit, including a pressure relief valve, and the pump motor to filter out brief changes in rotation due to momentary jamming conditions and thereby aid in discriminating between true and momentary jamming conditions.

REFERENCES:
patent: 3868062 (1975-02-01), Cunningham et al.
patent: 4034918 (1977-07-01), Culbertson et al.
patent: 4452400 (1984-06-01), Williams

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