A Cartridge Valve Used in Load Sensing System of Engineering Machinery
A load-sensitive, engineering machinery technology, applied in mechanical equipment, fluid pressure actuating devices, servo motor assemblies, etc., can solve the problems of complex internal flow channels, complex main engine pipelines, and heavy weight, and achieve reduced volume and weight, Reduced complexity and compact size
Active Publication Date: 2021-08-06
江苏军源装备制造有限公司
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Problems solved by technology
[0003] At present, the load-sensing multi-way directional valve used in the load-sensing system is generally in the form of three-position six-way, mostly in the form of castings, or a piece-type multi-way directional valve or an integral multi-way directional valve. The reversing valve has an eight-slot structure, and is equipped with a corresponding shuttle valve assembly. The internal flow path is very complicated, resulting in a large overall volume, heavy weight, and high cost; and with the complexity of the hydraulic oil circuit, the existing multi-way changer The directional valve is not suitable for integrated design. In order to meet the complex hydraulic oil circuit, it is necessary to connect the multi-way directional valve with other functional valve blocks through many hoses, which makes the pipeline of the main engine complex and easily causes oil leakage.
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[0024] see Figure 1-6 As shown, a cartridge valve used for load sensing systems of construction machinery includes a plug valve body 9, and the plug valve body 9 is provided with a left and right through valve hole 901, and the valve hole 901 is slidably connected with The valve core 8; the outer surface of the plug-in valve body 9 is provided with a first annular groove 902, a second annular groove 903, a third annular groove 904, and a fourth annular groove 905 from left to right. The annular groove 902 is provided with the LS feedback oil port 906 communicating with the valve hole 901, the second annular groove 903 is provided with the A oil port 91 and the first flow hole 9b communicating with the valve hole 901, and the third annular groove 904 is provided with There is a P oil port 93 communicating with the valve hole 901, and a B oil port 92 communicating with the valve hole 901 and a second flow hole 9c are provided in the fourth annular groove 905; the left end of th...
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The invention discloses a cartridge valve used in a load sensitive system of construction machinery, which comprises a plug valve body, the plug valve body is provided with left and right penetrating valve holes, and a valve core is slidably connected in the valve hole; A screw sleeve is installed on the left end of the valve body, and there is a mounting hole through the left and right inside the screw sleeve, and a transmission rod that is threadedly connected with the left end of the valve core is slidably connected in the mounting hole; a gap sleeve is installed on the left end of the valve hole. The screw plug connected to the transmission rod has a return spring between the screw plug and the left end of the transmission rod in the installation hole; the right end of the valve hole is the Y hydraulic control oil port; the valve core is provided with a second Three flow holes, the fourth flow hole, and the eleventh flow hole, the right end of the third flow hole communicates with the Y hydraulic oil control port; the cartridge valve has a simple and reasonable structure, low manufacturing cost, and is easy to integrate The design can simplify the hydraulic oil circuit.
Description
technical field [0001] The invention relates to the technical field of cartridge valves, in particular to a cartridge valve used in load sensing systems of engineering machinery. Background technique [0002] The multi-actuator load-sensing system is an energy-saving hydraulic system widely used in vehicles, construction machinery, agricultural machinery, mining machinery, forestry machinery, and petroleum machinery. , Executive agencies and other components. Since the system is only supplied by a single pump, it can simultaneously control multiple actuators with different load pressures through the load-sensitive multi-way reversing valve, and can ensure that the speed does not change with the load pressure, so the vehicle and The operation performance of construction machinery can avoid the phenomenon that the low load is too fast and the high load stops. [0003] At present, the load-sensing multi-way directional valve used in the load-sensing system is generally in the...
Claims
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IPC IPC(8): F15B13/02F15B13/04
CPCF15B13/02F15B13/0402F15B2013/0412
Inventor 刘艳荣
Owner 江苏军源装备制造有限公司