1．机械操纵方式存在的问题众所周知，液压操纵具有轻便省力，使用维修方便等许多优点，放目前大多数汽车起重机上车油门都采用液压操纵。坦还有一部分起重机上车油门仍使用传统的机械操纵方式，即通过钢丝绳（或杠杆）拉动发动机的油门操纵机构（汽油机的节气门，柴油机的调速 1. The problem of mechanical control methods As we all know, hydraulic control with light and labor-saving, easy to use and maintenance of many other advantages, put most of the current truck crane on the use of hydraulic control throttle. There are still some of the cranes on the car throttle still use the traditional mechanical manipulation, that is, through the wire rope (or lever) to pull the engine throttle control mechanism (gasoline engine throttle, diesel speed control