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英国某厂最近設計制造一种7T型液压汽車起重机。特点是采用折叠式吊臂和加长吊臂。行駛时,基本吊臂两节共长24呎(7.29米)折叠起来背在車尾,这时汽車的后悬是10呎(3.05米)。加长臂共6节,每节9呎(2.74米)都放在轉台上(图2),用的时候,把6节加长臂接起来,連同基本吊臂共长78呎(23.7米)。此外还能装一个16呎(4.86米)长的鹅头吊臂。吊鈎在运輸时放在吊臂头端桁架內部(图2)。轉台后部装有遙控操縱閥,用它控制起升和变幅机构来組装吊臂,这样一个人在五分钟內可把折叠起来的基本吊臂組装起来。
A British factory recently designed and manufactured a 7T hydraulic truck crane. Features are folding booms and extended booms. When driving, the two basic sections of the basic boom were 24 inches (7.29 meters) long and folded back up to the rear of the car. At this time, the rear suspension of the car was 10 inches (3.05 meters). The lengthened arms totaled 6 knots. Each section of 9 inches (2.74 meters) was placed on the turntable (Fig. 2). When used, the 6 lengthened arms were connected together, and the basic boom was a total of 78 inches (23.7 meters) long. In addition, a 16-inch (4.86-meter) long goose-head boom can be installed. The hooks are placed inside the boom truss during transport (Figure 2). The rear part of the turntable is equipped with a remote control valve, which controls the lifting and luffing mechanism to assemble the boom, so that a person can assemble the folded basic boom in five minutes.