A high-pressure automatic variable control method with hydraulic overload and control valve device

Abstract

The invention discloses a high-pressure automatic variable control method with hydraulic overload and a control valve device. According to the method, inlet pressure of a motor is sensed by using a control slide valve core with area difference so as to realize automatic high-pressure variables of the inlet pressure and displacement; pilot hydraulic control pressure is introduced into the tail end of the slide valve core to realize a hydraulic overload function; the device comprises the motor; an inlet and an outlet of the motor are connected with a control slide valve (4) through a one-way valve (2) respectively; the control slide valve (4) is provided with a pressure adjusting spring (3) and a feedback spring (5); the feedback spring (5) is connected with a variable cylinder (1); the variable cylinder (1) is also connected with the control slide valve (4). Complex superimposition of high-pressure automatic control and external pilot hydraulic control can be quickly realized under the conditions of complex and unpredictable geological working conditions, so that a host obtains the working efficiency and safety guarantee.

Description

technical field [0001] The invention relates to a control method and device of a bent-axis hydraulic variable motor, in particular to a high-pressure automatic variable control method with hydraulic overload and a control valve device. Background technique [0002] In order to meet the requirements of the working conditions of the rotary drilling rig, the executive motor in its lifting mechanism is usually equipped with a high-pressure automatic variable control mechanism with a pressure adjustment function to change the displacement of the motor. Specifically: when the inlet pressure of the motor increases, The displacement of the motor swings steplessly proportionally from the minimum displacement to the maximum displacement as the pressure increases. When the design of the motor is constant, the starting point of its variable control pressure is the set value. When there is no external pressure oil control, the variable relationship between motor pressure and displacemen...

AI Technical Summary

Problems solved by technology

However, under complex and unpredictable geological conditions, it is impossible to guarantee that the external pilot liquid control can effectively control the high-pressure automatic control in time, and in the variable process of the high-pressure automatic control, the external pilot liquid that is suddenly applied or changed Controlling pressure yields a fast and stable response

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