Cylindrical bale-forming press with torque-limiting device

Details Cylindrical bale-forming press with torque-limiting device Cylindrical bale-forming press with torque-limiting device

1985-01-28

1986-09-16

Feldman, Peter

Presses

Automatic or material triggered control

100 88, 56341, 56 102, B30B 506, A01D 3900

Patent

active

046115358

ABSTRACT:
This cylindrical bale-forming press comprises sets of belts, bands or the like which define a chamber for forming a bale by rolling up crop products. At least one stationary roller drives the belts and is itself driven from a main drive shaft. Some of the guide rollers are movable and are subjected to a biasing action by hydraulic cylinders so as to maintain the belts under tension. According to the invention, a torque sensor is provided on the main drive shaft of the press and operates to provide an electrical output signal which is operatively connected to electrically responsive valve means in the hydraulic circuitry for controlling the hydraulic cylinders so as to reduce or eliminate the tension in the belts when an excessive resisting torque on the main driving shaft is sensed. In one embodiment wherein the hydraulic cylinders are associated with an expansion valve, the torque sensor is operatively connected to the expansion valve so as to lower the threshold of response of the valve in response to an excessive torque being sensed. According to a variant, an electrically responsive shunt valve which is movable to a position wherein it interconnects the opposite ends of the hydraulic cylinders may be connected in parallel with the hydraulic cylinders for actuation in response to the output signal of the torque sensor.

REFERENCES:
patent: 4257219 (1981-03-01), Burrough et al.
patent: 4391187 (1983-07-01), Koning et al.
patent: 4433619 (1984-02-01), Anstey et al.
patent: 4545298 (1985-10-01), Viaud

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