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1. 发明授权

US4630524A Control valve for pile driver and method 失效
标题翻译：打桩机控制阀及方法
公开(公告)号：US4630524A
公开(公告)日：1986-12-23
申请号：US639701
申请日：1984-08-13
申请人： E. Don Jackson
发明人： E. Don Jackson
IPC分类号： F01L27/02 , F01L31/18 , F01L33/04 , F01L31/00
CPC分类号： F01L27/02 , F01L31/18 , F01L33/04
摘要： A power driver and method of pile driving. The invention encompasses a pile driver having a ram, cylinder and piston arrangement mounted in a framework, such arrangement being typical of those power drivers of the prior art. A compressible fluid, such as air or steam, enters into the cylinder through an intake port and leaves through an exhaust port. Both ports are controlled by a common valve. Expansion of the steam within the cylinder acts against the piston causing the piston rod to rise thus raising the ram and an associated slide bar. As the slide bar rises, it triggers the valve to move into a position effecting closure of both intake and exhaust ports. Further rising of the piston effects movement of the valve into a position wherein the intake port remains closed and the exhaust port is opened, thus exhausting the excess steam. Movement of the valve by elevation of the slide bar at each stage of movement is effected through triggering of cam followers or trips by cams on the slide bar. At the end of the power stroke, the valve is returned to the first position which opens the intake port and closes the exhaust port and the steps are repeated. Thus, during a significant portion of the total distance of travel of the piston, fluid is neither entering nor leaving the cylinder but is expanding and performing work on the piston, thereby providing an energy savings in operation of the driver of ten to fifty percent over devices of the prior art.
摘要翻译：动力驱动器和打桩方法。本发明包括具有安装在框架中的冲头，气缸和活塞装置的打桩机，这种布置是现有技术的这些动力驱动器的典型。诸如空气或蒸汽的可压缩流体通过进气口进入气缸并离开排气口。两个端口均由普通阀门控制。气缸内的蒸汽的膨胀作用在活塞上，导致活塞杆升高，从而升高压头和相关的滑动杆。当滑杆升高时，它触发阀门移动到进入和排出端口的闭合位置。活塞的进一步上升影响阀进入其中进气口保持关闭并且排气口打开的位置的运动，从而排出多余的蒸汽。通过在每个运动阶段通过滑杆升高来实现阀门的移动，通过滑动杆上的凸轮触发凸轮从动件或跳闸来实现。在动力行程结束时，阀返回到打开进气口的第一位置并关闭排气口，并重复该步骤。因此，在活塞的总行程距离的很大一部分内，流体既不进入也不离开气缸，而是在活塞上膨胀并执行工作，从而在驾驶员的操作中提供十到百分之五十的能量节省现有技术的装置。

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