Magnetically controlled material-based magnetorheological pilot operated safety valve for hydraulic support, and applications of the same

A magnetically controlled material-based magnetorheological pilot operated safety valve for a hydraulic support, comprising a valve body, a valve core, a reset spring, and a pilot valve;

• wherein the valve core is disposed in a valve core chamber provided in the valve body, the pilot valve is disposed in a pilot valve chamber provided in the valve body, the reset spring is disposed in a spring chamber provided at the top end of the valve core and in a spring chamber provided in the valve body, the pilot valve chamber and the valve core chamber communicate there between via a first control oil flow passageway and a second control oil flow passageway, a magnetorheological fluid is filled in the pilot valve chamber, and an emulsion is filled in the valve core chamber;
• the pilot valve includes a magnetically controlled shape memory alloy, an electromagnet, a push rod, a piston, a magnetorheological fluid control coil, and a pilot valve core, which are arranged sequentially from left to right;
• a plurality of magnetically controlled material control coils are provided on the electromagnet;
• the magnetically controlled shape memory alloy runs through the electromagnet, a front end of the magnetically controlled shape memory alloy being connected to the push rod;
• the push rod is connected to the piston, the magnetorheological fluid lies between the piston and the pilot valve core, and a damping hole is provided in the axial direction of the magnetorheological fluid control coil.