Automatic irrigation machine including a drum driven by a...

Details Automatic irrigation machine including a drum driven by a... Automatic irrigation machine including a drum driven by a...

A - Human Necessities

01

G

342/21, 299/4

A01G 25/16 (2006.01) A01G 25/09 (2006.01)

Patent

CA 2010832

A B S T R A C T This invention relates to an automatic irri- gation machine of the type comprising a flexible irri- gation hose feeding a sprinkler apparatus mounted on a carriage and wound onto a drum which is rotated by a deformable actuator that reciprocates a rocker arm carrying a finger at its free end which co-operates with holes regularly spaced apart on a ring concentric with said drum, the machine including a computer pro- vided with a memory and with a keyboard, a first angu- lar displacement sensor for sensing angular displace- ment of the drum and situated in the proximity of said ring to deliver a pulse to the computer each time one of said holes goes past it, and a water sensor which delivers a signal to the computer proportional to the water pressure or the water flow rate at the inlet to the machine, said computer being programmed to calcu- late on a continuous basis a theoretical winding speed for delivering a predetermined depth of water all along a strip of ground while taking account of the instanta- neous flow rate as measured or calculated on the basis of the inlet pressure, and for calculating, firstly the length of hose wound in during each go-and-return cycle of the actuator as a function of the number of layers of hose already wound on the drum, and secondly the ideal go-and-return cycle time of the actuator corre- sponding to said ideal speed, with the computer regu- lating the duration of the go-and-return cycles of said actuator so that they are constantly equal to said ideal duration.

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