时针式喷灌系统和平移式喷灌系统比较有许多优点,但它致命的弱点是它的控制面积是个园形,而地块一般为方形,地角无法喷到。近年来有些国家在时针式喷灌系统末端装了喷角装置,一般是一个可旋转的悬臂,由埋设在地下的电缆发出无线电讯号来控制,使之在地角伸直并喷洒,到边上又逐渐折回停喷,这样结构较为复杂。据美刊《灌溉时代》(Irrigation age)1978年7-8月号介绍;最近雷恩克公司在它们生产的时针式系统上采用了一种新型的喷角装置,它们称之为“雷恩克喷角装置”(ReinkeCornergator)。这种时针式喷灌系统的最后 The hourglass sprinkler system and the translating sprinkler system have many advantages, but its fatal weakness is that it controls the area of ​​a park, and the plot is generally square, the ground can not spray. In recent years, some countries have spray angle devices installed at the end of the hourglass sprinkler system, usually a rotatable cantilever, which is controlled by a radio signal buried in the underground cable so as to be straight and sprayed at the corner to the side Gradually return to stop spraying, so the structure is more complicated. According to the American publication Irrigation age, July-August 1978, 1978, Renke recently introduced a new type of cornering device on their hourglass system, which they called “Rennes G angle device ”(ReinkeCornergator). The last of this hourglass sprinkler system