Proportional multi-way valve with steering load feedback

Abstract

The invention discloses a proportional multi-way valve with a turning load feedback function, comprising an oil inlet control joint valve body and a unit operation control joint valve body which are sequentially overlapped; a three-way flow valve core, a main overflow valve, and a turning valve core and a first pressure compensation valve which are integrated and matched are arranged in the oil inlet control joint valve body; an oil inlet of the three-way flow valve core is communicated with a pressure oil duct, and an oil return port of the three-way flow valve core is communicated with an oil return channel; the oil inlet of the main overflow valve is communicated with a load sensing port oil duct, and the oil return port of the main overflow valve is communicated with the oil return channel; the load sensing port oil duct is also communicated with a spring cavity control end of the three-way flow valve core; a unit control valve core and a second pressure compensation valve which are integrated and matched are arranged in the unit operation control joint valve body; the three-way flow valve core is arranged, so that the immediate discharge of real-time flow is realized, the action is flexible, and the control performance is improved; a turning auxiliary load feedback function is added, so that the operation efficiency of a whole machine and the actual operability are improved; and a two-position two-way electromagnetic valve is added, two operation modes, i.e. electrification and non-electrification are designed, so that the operation safety in configuration is improved.

Description

technical field [0001] The invention relates to the technical field of multi-way hydraulic valves, in particular to a proportional multi-way valve with steering load feedback function, which is especially suitable for forklift operation. Background technique [0002] At present, the multi-way valve configured by domestic forklifts is basically an ordinary multi-way reversing valve, which is an on-off valve. When the valve has a small opening and heavy load, it will not move, because the input flow cannot match the change of the valve core. , the entire output power is greatly wasted under non-full load conditions, so the actual operation consumes a lot of energy, and the controllability of the operating speed is poor. [0003] In the prior art, proportional fluid technology has been widely used, including proportional pressure valves, flow valves, reversing valves, and multi-way valves; for example, the Chinese invention patent "A Proportional Control "Multi-way valve" (ann...

AI Technical Summary

Problems solved by technology

[0002] At present, the multi-way valve configured by domestic forklifts is basically an ordinary multi-way reversing valve, which is an on-off valve. When the valve has a small opening and heavy load, it will not move, because the input flow cannot match the change of the valve core. , the whole output power has a huge waste under the non-full load condition, so the actual operation consumes a lot of energy, and the controllability of the operating speed is poor

[0003] In the prior art, proportional fluid technology has been widely used, including proportional pressure valves, flow valves, reversing valves, and multi-way valves; for example, the Chinese invention patent "A Proportional Control "Multi-way valve" (announcement number is CN201963627U) is such a design; the built-in inclined connection and the basic connection are respectively equipped with a tilting valve and a basic valve, and the tilting valve and the basic valve are equipped with pressure compensators; the main oil outlet of the priority valve The port is connected with the pressure oil channel placed in the basic unit and the inclined unit, and the pressure oil channel is respectively connected with the oil inlet ports of the three-way flow valve, the inclined valve and the basic valve; the oil inlet port of the solenoid valve is connected with the three-way flow valve The spring chamber and the spring chamber of the pressure compensator are respectively connected; the oil outlets of the main relief valve, three-way flow valve, tilt valve, basic valve, and solenoid valve are all connected with the oil return channel; although this design has the characteristic of flow ratio, but The pressure ports of each operating valve link are always in the same closed cavity; once the hydraulic system is started, the oil inlet ports of each operating valve link are in a state of pressure. If there is a slight misoperation, it will easily cause the actual operation to be out of control and reduce safety.

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