A plug-in pilot large flow load control valve
A technology of load control and large flow, applied in the direction of fluid pressure actuators, servo motors, servo motor components, etc., can solve the problems of load speed jitter, poor control effect, inconvenient use of over load hydraulic circuits, etc., and achieve simple installation , Overcoming the effect of large connecting pipeline space and compact overall structure
Active Publication Date: 2021-09-17
ZHEJIANG UNIV
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Problems solved by technology
[0007] In view of the disadvantages in the background art that the control effect of the load control valve is poor and the load speed vibration is easy to occur under the overload condition, the purpose of the present invention is to provide a plug-in large flow load control valve applying the principle of displacement-force feedback, The valve not only has good speed control characteristics and micro-motion performance, but also is compatible with a large range of pilot control pressure, and has good load overcompensation characteristics. Hydraulic systems, especially suitable for overrunning load hydraulic circuits where plate connection valves are not convenient
Method used
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Embodiment Construction
[0047] Embodiments of the present invention will be described below with reference to the drawings.
[0048] Such as figure 1 As shown, it includes locking screw sleeve 1, cartridge valve body 2, main valve core 3, main valve sleeve 4, feedback spring 5, pilot valve sleeve 7, pilot valve core 8, pilot compression spring 9, control piston 10 and control end cap 14.
[0049] Such as figure 2 As shown, the rear end of the cartridge valve body 2 is fixedly installed with the control end cover 14 through the locking bolt 15, the control end cover 14 and the rear end surface of the cartridge valve body 2 are connected by a sealing ring, and the outer end surface of the control end cover 14 A central through hole is opened as the Px port of the plug-in pilot large flow load control valve, which is the control oil port. The cartridge valve body 2 has a cylindrical structure, and a hollow valve chamber is formed inside. The middle part of the cartridge valve body 2 is provided with...
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The invention discloses a plug-in pilot large flow load control valve. Including lock screw sleeve, cartridge valve body, main valve core, main valve sleeve, feedback spring, pilot valve sleeve, pilot valve core, pilot compression spring, control piston and control end cover; The control pressure can accurately control the lowering speed. By matching the pilot oil return damping and pilot inlet damping, it can be compatible with a wider range of pilot control pressure. The throttle groove on the pilot spool is designed in sections, and when the one-way large flow is opened The port pressure drop control is low, which makes the load control valve have a fast closing function. The present invention adopts a plug-in design as a whole, which can be precisely controlled, compatible with a wider range of pilot control pressure, has better fretting characteristics and load overcompensation characteristics, and has a higher stability margin, and can be compatible with larger pilot control pressures. flow and has the function of dividing pressure.
Description
technical field [0001] The invention relates to a hydraulic control element, in particular to a plug-in pilot large flow load control valve used for connecting with an oil cylinder. Background technique [0002] In the construction of construction machinery, there are often working conditions that exceed the load, such as the luffing and lowering of truck cranes and crawler cranes, and the lowering of the main and auxiliary winches. Under the condition of excess load, the actuator is required to move smoothly without stalling, especially when the large-tonnage crane is lowered in luffing, the action stability is required to be higher, and the hydraulic circuit with excess load generally requires a load control valve. [0003] Due to the high load pressure and complex load conditions, the flow control characteristics of the load control valve directly determine the speed control characteristics and speed stability of the hydraulic system. The traditional load control method ...
Claims
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IPC IPC(8): F15B13/043F15B11/05
CPCF15B11/05F15B13/043F15B2211/40553
Inventor 谢海波王承震杨华勇
Owner ZHEJIANG UNIV