| 主权项 |
1. A load sensing and lift cylinder adjusting system for a three-point linkage arrangement on a tractor, comprising:
a hydraulic oil supply; a control system in the form of a PLC enables load setting; a load sensing system in the form of a load sensing proportional valve in fluid connection with the lift cylinder via a directional valve; a load adjusting system which includes a load sense pump connected to the load sensing proportional valve and the tractor's hydraulic oil supply;wherein the load setting system is configured to allow a desired load to be pre-set for lift cylinder(s) of the three point linkage, when first connected to a towed implement, prior to commencing a work operation with said implement, and once the load setting system has pre-set the load, the load sensing system is informed of a pre-set load being selected and then monitors the load on the lift cylinder via the oil pressure from within the lift cylinder and:
if the load drops from the pre-set load this sends a signal to the load adjusting system which diverts oil from a hydraulic oil supply to the lift cylinder to maintain the pre-set load; and if the pre-set load is exceeded a signal is sent to the load adjusting system which diverts oil from the lift cylinder back to the tractor's hydraulic oil supply. |
