초록 ▼

A liquid such as a herbicide is delivered from spray nozzles (4) on a boom (2). The herbicide is supplied from a herbicide container (8) by a pump (18), and is diluted with water supplied from a tank (10) by a pump (12). The speed of the herbicide pump (18) is controlled by control means (22) and is

A liquid such as a herbicide is delivered from spray nozzles (4) on a boom (2). The herbicide is supplied from a herbicide container (8) by a pump (18), and is diluted with water supplied from a tank (10) by a pump (12). The speed of the herbicide pump (18) is controlled by control means (22) and is responsive to the travel speed of the apparatus. The volumetric output of the pump (18) is calibrated by supplying the herbicide to a calibration vessel (32) during a test cycle in which the apparatus travels over a predetermined distance. Correction factors can then be input to the control means (22) in order to bring the volumetric output of the pump (18) into line with desired flow rates.

대표청구항 ▼

Apparatus for delivering a liquid, the apparatus being adapted for travel over a surface to which the liquid is to be delivered, the apparatus comprising a source of liquid, a variable output reversible pump, delivery means to which the liquid is supplied by the pump from the source, control means f

Apparatus for delivering a liquid, the apparatus being adapted for travel over a surface to which the liquid is to be delivered, the apparatus comprising a source of liquid, a variable output reversible pump, delivery means to which the liquid is supplied by the pump from the source, control means for adjusting the output of the pump, and a travel speed sensor for transmitting a travel speed signal to the control means, a duct being provided for directing liquid from the pump to the lower region of a calibration vessel for determining the volumetric output of the pump, reversal of the pump causing liquid to be returned from the calibration vessel to the source.