The Electro-hydraulic Directional Valve of surface grinder is composed of solenoid slide valve of pilot valve and hydraulic slide valve of main valve. This system is through the surface grinder pilot valve reversing switching control oil circuit. If the direction of oil flow in the control oil circuit is not changed, the reversing valve is always kept at the original end, and the direction of the main oil circuit is not changed, the worktable can always move forward. Once the direction of the oil circuit is changed, the valve core of the main valve will move to another operation direction according to the preset speed. When the direction of the main oil circuit is changed, the worktable will change direction, avoiding the "dead point" of direction change.
In this way, the kinetic energy of the large inertia worktable can be converted into heat energy through the saving effect and consumed. The size of the control oil port of the main valve of the electro-hydraulic directional valve is adjustable, that is, the directional time △ t can be extended. It can effectively reduce the commutation impact, so this commutation method is dominant for a long time. However, its commutation parameters can only be set in advance, and can not be changed according to the change of working conditions. For the system whose working conditions change at any time, it is impossible to complete the desired commutation. The surface grinder adopts the hydraulic transmission reversing system of electro-hydraulic proportional valve. The purpose of smooth and non impact commutation is achieved by automatically reducing the flow rate. An intelligent control type commutation system can also complete the desired commutation when the working conditions are changed. This kind of hydraulic transmission reversing system completes the excellent intelligent control of the output displacement or speed, so that the reversing process has a certain degree of controllability, so it has a very wide range of use.
On 2018-08-08 11:45:46
