比例积分阀.ppt

液压技术社区 液压技术社区 液压技术社区 顶升举例- 比例系统LIFT EXAMPLE - PROPORTIONAL SYSTEM 同样地，减加速度也能够被控制，使阀芯运动回中位的速度变慢。 And likewise the deceleration can be controlled by slowing down the speed of spool movement back to the centre condition. time Distance 运动控制 MOTION CONTROL 因此总的来说，比例阀能够提供全部的运动控制包括： In general therefore, proportional valves are capable of providing full motion control in terms of: time Acceleration Distance MOTION CONTROL 1. A smooth and controlled acceleration of an actuator up to its maximum speed. 一个平滑和受控的加速度，使执行器达到最大速度。 time Acceleration Velocity Distance MOTION CONTROL 2. Control of the actuator velocity and if necessary maintaining it constant with varying loads. 执行器速度的控制，如果必要维持其在变化负载下的稳定。 time Acceleration Deceleration Velocity Distance MOTION CONTROL 3. A smooth deceleration with minimal pressure peaks. 一个平滑的带有最小化压力峰值的减加速度 time Position Acceleration Deceleration Velocity Distance MOTION CONTROL 4. By using suitable sensing devices, the proportional valve can also be used to control the actuator stopping position to high levels of accuracy. 通过使用合适的传感装置，比例阀也可以被用来高精度地控制执行器的位置 time Force 力控制 FORCE CONTROL 比例阀也能够被用来控制执行器力地输出，通过控制应用于执行器上地压强。（例如在压机中或注塑机应用）Proportional valves can also be used to control the force output from an actuator (for example in press or plastic injection moulding applications) by controlling the pressure applied to the actuator. time Force FORCE CONTROL 在这样的实例中，不仅要求控制最大的执行器压力。而且要求控制应用中或运动中的压力等级。 In such cases it is often necessary to control not only the maximum actuator pressure but also the rate at which the pressure is applied or removed. time Force FORCE CONTROL In fact the machine cycle may consist of a series of ramps and holding periods all of which can be achieved with just the one proportional valve. 实际上机器工作周期可能由一系列的斜坡和停止阶段组成，所有这些可以由一个比例阀来完成。 time Force FORCE CONTROL At the end of the machine cycle the rate at which the pressure is reduced is also critical in many processes. 在机器运行周期后段，在很多工序中压力等级的降低也是要求很严格的。 FORCE CONTROL Motion and f