Large-flow mechanical feedback pilot control plug-in type proportional throttling valve system

Abstract

The invention relates to a large flow mechanical feedback pilot control plug-in type proportional throttling valve system and in particular relates to forward and reverse flowing throttling valve system engineering machinery equipment. The system is characterized in that the side of a main valve sleeve is provided with a main valve oil inlet and a main valve oil outlet, a back-moving spring is arranged between a main valve core and a guide sleeve, one end of a pilot valve sleeve is provided with a screw cover, a device feedback spring is arranged between the guide valve core and the guide sleeve, a first control port is communicated with one end of a first check valve, the other end of the first check valve is communicated with a pilot valve oil inlet, a second control port is communicated with one end of a second check valve, the other end of the second check valve is communicated with a pilot valve work port, the pilot valve oil inlet is communicated with the pilot valve work port, a third control port is communicated with a guide valve control port, the guide valve return opening is communicated with the guide sleeve and a cover plate return opening. The throttling valve system provided by the invention has the advantages of simple structure, instantaneous open, high linearity and small hysteresis based on the adopted mechanical closed loop feedback, thus the throttling valve system can be widely applied to a hydraulic control system of engineering machinery, machine tool casting-forging, diecast metallurgy, shipping and mine industry.

Description

technical field [0001] The invention relates to a large-flow mechanical feedback pilot control plug-in proportional throttle valve system, especially a large-flow mechanical feedback pilot control plug-in proportional valve 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 produced, such as...

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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 the above structure is used for bulldozers with 500 horsepower or more, the pressure loss will reach 30 kg, the energy consumption will be high, and the appearance will be bulky and occupy a large space. Big, inconvenient to maintain

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