Hydraulic floating system for downpressure control of seeding to

Details Hydraulic floating system for downpressure control of seeding to Hydraulic floating system for downpressure control of seeding to

1994-03-14

1996-10-08

Warnick, IV, Spencer K.

Earth working

Automatic power control

Land leveller type

172315, 172263, 111926, A01B 63111

Patent

active

055621651

ABSTRACT:
A hydraulic downpressure system for use on no-tillage seeders allows for a constant downward force to be applied on seeding tools operating in highly variable soil surface conditions in order to keep a uniform seeding or planting depth. Raising and lowering of the seeding units can also be achieved with this hydraulic system. A double acting hydraulic cylinder is principally used having its rod end connected to one or two seeding units. A hydraulically operated two-way mode selection valve provides system shifting between both modes involved. The first mode is used when transporting the seeder on roads and to operate the seeding tools in the field. Control is then provided by a three-way directional valve mounted to an external hydraulic power supply, such as an agricultural tractor. Raising and lowering of the seeding tools can be achieved when operating in this mode. A second mode is involved when the seeding tools are working into the ground to sow seeds. Pressure applied on both ports of the hydraulic cylinder comes from a nitrogen accumulator that acts as a pressure absorber which results in a net downward force. The cylinder can thus move independently while always maintaining the same force. A second three-way directional valve regulates the pressure in the accumulator and protects system from overload pressure. Downpressure adjustment is directly dependent from this control valve. A pressure compensator prevents a differential of pressure during system mode changes. The force from one cylinder can be applied on two seeding units using a double linkage system.

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