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1. 发明授权

US5303549A Counterforce and holding device 失效
标题翻译：反力装置
公开(公告)号：US5303549A
公开(公告)日：1994-04-19
申请号：US740280
申请日：1991-08-05
申请人： Merrill E. Berchtold , Dean M. Valvano
发明人： Merrill E. Berchtold , Dean M. Valvano
IPC分类号： B23Q11/00 , E21B19/086 , F15B1/02 , F15B20/00 , F16B31/02
CPC分类号： F15B20/002 , B23Q11/001 , E21B19/086 , F15B1/02
摘要： A counterforce cylinder and piston exert an upward force on the vertically movable slide of a machine. The cylinder pressure line handles reverse flows during operations of the slide. A pilot-operated checkvalve (normally closed) is inserted in the cylinder line between a pressure source and the counterforce cylinder, and is held open during usual operation of the machine. An accumulator is branch-connected to the cylinder line, at a point between the checkvalve and counterforce cylinder. During machine operations, the accumulator stores pressurized fluid; at shutdown of power, the fast-acting checkvalve closes and reliably seals the cylinder line while the accumulator provides pressure to maintain the counterforce cylinder and slide in a substantially constant holding position for several days.
摘要翻译：反作用气缸和活塞在机器的可垂直移动的滑块上施加向上的力。气缸压力线在滑块操作期间处理反向流动。先导操作的止回阀（常闭）插入压力源和反作用气缸之间的气缸管路中，并且在机器的通常操作期间保持打开。在止回阀和反作用气缸之间的点处，蓄能器分支连接到气缸管线。在机器操作期间，蓄能器存储加压流体; 在停电时，快速作用的止回阀关闭并可靠地密封气缸管线，同时蓄能器提供压力以保持反作用气缸并且在基本上恒定的保持位置中滑动数天。

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