High-flow hydraulic feedback pilot control plug-type proportion throttle valve system

Abstract

The invention relates to a high-flow hydraulic feedback pilot control plug-type proportion throttle valve system, and in particular a high-flow hydraulic feedback pilot control plug-type proportion throttle valve system engineering mechanical device which flows forward and reverse. The side face of a main valve sleeve is provided with a main valve oil inlet and a main valve oil outlet; an axial hole of the main valve sleeve is provided with a main valve plug internally; the axial hole of the main valve plug is provided with a number one check valve internally; one end of the main valve plug is provided with a cross throttling groove, and the other end of the main valve plug is provided with a thin and long throttle valve; the axial hole of a pilot valve sleeve is internally provided with a pilot valve plug; a restoration spring is arranged between the pilot valve plug and a thread insert; one end of a number two check valve is communicated with a main valve plug control chamber; one end of the number two check valve is communicated with a number three pilot valve control port; and one end of the number two check valve is communicated with a number one control port. The proportion throttle valve system provided by the invention has the advantages of simple structure, temporary starting, proportion control, high linearity and small hysteresis loop, and is widely used for a hydraulic control system of the industries of machine tool forging and metallurgy of engineering machinery, ship and mine.

Description

technical field [0001] The invention relates to a large-flow hydraulic feedback pilot control plug-in proportional throttle valve system, especially a large-flow hydraulic feedback pilot control plug-in proportional throttle valve system with large flow, high horsepower, pilot valve proportional control flow, forward and reverse flow Flow valve system engineering machinery and equipment. Background technique [0002] At present, the multi-way reversing valves used in construction machinery all adopt the structure of slide valve core and cast valve body. Due to the influence of system pressure and the limitation of valve body strength, the maximum diameter is applied to 22 mm. diameter, it has not been able to break through the flow rate of 25 mm diameter. Even if the above structure can be used, the cost is quite expensive and the user cannot accept it. Therefore, up to now, domestic construction machinery with high horsepower and large flow rate has not been able to be prod...

AI Technical Summary

Problems solved by technology

[0002] At present, the multi-way reversing valves used in construction machinery all adopt the structure of slide valve core and cast valve body. Due to the influence of system pressure and the limitation of valve body strength, the maximum diameter is applied to 22 mm. diameter, it has not been able to break through the flow rate of 25 mm diameter. Even if the above structure can be used, the cost is quite expensive and the user cannot accept it. Therefore, up to now, domestic construction machinery with high horsepower and large flow rate has not been able to be produced, such as : If a 500-horsepower bulldozer uses the above structure, its pressure loss will reach 30 kg, its energy consumption will be high, its appearance will be bulky, and it will take up a lot of space. At the same time, the structure of the control part will be complex, with a high failure rate, serious leakage, unstable action, and large impact. , inconvenient maintenance

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