| 摘要 |
An irrigator comprises a base (2) and a spray tube (3) rotatably connected to the base (2) and destined to rotate about a rotation axis (X), the spray tube (3) directing a flow of the fluid towards a portion of terrain to be irrigated. The irrigator further comprises an intermediate element (10) fixed to the base (2) and having a cylindrical lateral surface (10b) on which a collar (11) is contactingly engaged. The collar (11) is solidly constrained to the spray tube (3) and rotated by the spray tube (3) about the rotation axis (X) in order to drag on the lateral surface (10b) of the intermediate element (10). The irrigator further comprises braking means (10, 11a), acting between the spray tube (3) and the base (2) by dragging in order to reduce the rotation velocity of the spray tube (3) about the rotation axis (X), and means for regulating (11c, 17, 20), commanded by the rotation of the spray tube (3) about the rotation axis (X) and acting on the braking means (10, 11a) in order to vary a braking force exerted by the braking means (10, 11a) according to an angular position assumed by the spray tube (3) about the rotation axis (X).
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