Spray boom system with automatic boom end height control

摘要

A spray boom system for mounting on a vehicle with opposite sides includes a pair of boom assemblies with proximate and distal ends. The boom assemblies are mounted on the vehicle and are swingable between laterally-extending field positions and folded travel positions generally alongside the vehicle. Hinged connector assemblies are attached to the boom assembly proximate ends for permitting the swinging movement of the boom arms and also permit the boom arms to be independently raised and lowered by a pair of hydraulic cylinders which are also connected to the boom assembly proximate ends. The operation of the cylinders for raising and lowering the boom assemblies is controlled by a height control system which utilizes ultrasonic signals for determining heights of the boom assemblies above a field or crop surface. A liquid dispensing system includes a tank for mounting on the bed of the vehicle, a pump, spray nozzles mounted on the boom assemblies and tubing interconnecting the liquid dispensing system components.