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Abstract
Typical slewing valve is a three-position six-way proportional valve based on bypass throttle principle, whose output flow rate and opening dead zone of the main valve port are both affected by the load. Thus, it has poor performances in dynamic control of varying loads. This article presents a novel slewing valve based on bypass pressure-compensation principle, which has much better performance in dynamic control of varying loads and even for large inertia loads. A pressure-compensated valve is added to connect the out ports of the main valve port and the bypass port to keep the pressure differences at the main valve port and the bypass port in same. As a result, the flow distribution ratio of these two ports keeps stable for a certain spool position, which can avoid the output flow rate fluctuation despite the varying loads. In addition, the opening dead zone of the main valve port is very small and keeps almost unchanged. These advantages make the proposed valve to control large inertia load with great stability. In the article, a mathematical model formulating the dynamic performance of the valve is further established to provide guide for the optimization of the parameters, including the shapes and orifice areas of the main valve port and bypass port, the stiffness of the spring controlling spool motion, and so on. A prototype valve was manufactured based on the presented method. A series of tests on experiment bench and real crane validate its great performances on flow rate and dead zone stabilities as well as fast dynamic response.
Highlights
Slewing valves are widely used for rotary motion control in various engineering machineries, such as in port handling and metallurgical machineries, cranes, and in some large robots and tanks.[1]
Resistance to load fluctuations is especially important for a slewing valve, as large inertia loads should be controlled commonly and the start, stop, as well as fluctuation of its motion will cause serious force and torque changes on mechanism
This article presents a novel slewing valve based on bypass pressure-compensation principle, which has much better performance in dynamic control of large inertia loads compared with traditional slewing valves
Summary
Slewing valves are widely used for rotary motion control in various engineering machineries, such as in port handling and metallurgical machineries, cranes, and in some large robots and tanks.[1]. The contents of this article are as follows: introducing the design principle of the slewing valve with resistance to load fluctuations (SVRLF), including the principle of the proposed bypass pressurecompensation method and the working process of SVRLF; presenting a mathematical model formulating the dynamic performance of the SVRLF, which was established to provide guide for the optimization of the parameters, including the shapes and orifice areas of the MVP and BP, the stiffness of the spring controlling spool motion, and so on.
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