Automated mechanical system for positioning leveler at starting paving depth

A paver may include a frame; a leveler coupled to the frame, the leveler comprising one or more leveler plates; one or more movable extension mechanisms located at a rear end of each of the leveler plates and configured to extend up and down and retract below the leveler plates; and a controller configured to extend the one or more extension mechanisms by a predetermined distance before the leveler starts the paving operation, and to retract the one or more extension mechanisms after the leveler has started the paving operation. 一种铺路机可以包括框架；联接到框架的整平器，整平器包括一个或多个整平器板；一个或多个可移动的延伸机构，其位于每个整平器板的后端，并且经配置在整平器板下方上下延伸和缩回；以及控制器，其经配置在整平器开始铺路操作之前将一个或多个延伸机构延伸预定距离，并且在整平器已经开始铺路操作之后缩回一个或多个延伸机构。