一、前言目前采用气压传动的场合,一般是借助于活塞杆上的撞块碰通电气行程开关,发出电信号,指挥电控方向控制阀使其切换,来达到控制气缸行程的目的。由于电气行程开关被多次碰撞,很容易损坏,所以需要经常更换,这样不仅使维修费用增加,而且往往造成意外故障,使机构的可靠性降低。另外,在设计气压 I. INTRODUCTION At present, pneumatic transmission is used to control the stroke of the cylinder by switching on the electrical stroke switch of the piston rod and issuing the electrical signal to direct the electronic control directional control valve to switch. Because the electrical stroke switch is repeatedly collided, it is easy to damage, so it needs to be replaced frequently. This not only increases the maintenance cost, but also often causes unexpected failure, which reduces the reliability of the mechanism. In addition, the design pressure