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美国英格索尔—兰德(Ingersoll-Rand)公司从事建筑机器的设计和生产已经一百年以上,它的主要事业方向之一,是生产钻机。除生产带空气分配阀的URD型钻机(图1α)外,还生产无阀门的VL型钻机(图1δ)。在VL钻机中,活塞的加长尾杆操纵空气的供应,或进入前室或进入后室。由于压缩空气的供应,仅由活塞的位置来确定,所以供气的瞬间总是不变的,这与带空气分配阀的钻机不同。加长尾杆同时也是活塞的第二个支点,从而可以大
The Ingersoll-Rand company in the United States has been engaged in the design and production of construction machines for more than one hundred years. One of its main business directions is the production of drilling rigs. In addition to the production of URD drilling rigs with air distribution valves (Fig. 1α), valveless VL drilling rigs are also produced (Fig. 1δ). In VL drilling rigs, the extended tailpipe of the piston manipulates the supply of air either into the front chamber or into the rear chamber. Since the supply of compressed air is determined solely by the position of the piston, the moment of supply is always constant, unlike the rig with an air distribution valve. The long tail rod is also the second fulcrum of the piston, which can be large