Multi-channel proportional flow distribution valve bank applicable to various variable pump systems

Abstract

The invention discloses a multi-channel proportional flow distribution valve bank applicable to various variable pump systems, which comprises a first pressure pipeline, a second pressure pipeline and an oil return line, wherein the first pressure pipeline and the second pressure pipeline are communicated by an external oil pump; the oil return pipeline is communicated with external return oil; the first pressure pipeline is communicated with oil inlet ends of a first spillover valve, a first tee flow valve, a first proportional reversing valve and a second proportional reversing valve respectively; and the second pressure pipeline is communicated with oil inlet ends of a second spillover valve, a second tee flow valve, a third proportional reversing valve and a fourth proportional reversing valve correspondingly and respectively. The multi-channel proportional flow distribution valve bank improves manipulation performance considerably, realizes proportional stepless speed regulation of a plurality of actuating mechanisms under the condition of respective different loads. A main oil line is unloaded by a shunt valve so as to prevent pressure shock effectively and slow down and even eliminate mechanism shake effectively during proportional speed regulation; and the middle of the multi-channel proportional flow distribution valve bank is in transitional connected with a logic switch valve, two actions are non-interfering during manipulation, and the synchronous operation of multi-action can be realized.

Description

technical field [0001] The invention relates to the technical field of hydraulic valves, in particular to a multi-channel proportional flow distribution valve group suitable for various variable variable pump systems. It is suitable for all kinds of hydraulic truck crane variable pump systems in construction machinery, including the various operating mechanisms of the upper circuit hydraulic system of tire type and crawler cranes, and realizes the proportional stepless speed regulation of several actuators under different loads. Background technique [0002] Modern hydraulic engineering machinery, while pursuing the high efficiency and energy saving of proportional speed regulation and proportional flow distribution, also protects the output power of the diesel engine driving the oil pump to prevent the engine from shutting down due to overload. For this reason, the constant power variable pump system is often used. The developed post-valve compensation proportional flow dis...

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Problems solved by technology

[0002] Modern hydraulic engineering machinery, while pursuing the high efficiency and energy saving of proportional speed regulation and proportional flow distribution, also protects the output power of the diesel engine driving the oil pump to prevent the engine from shutting down due to overload. For this reason, the constant power variable pump system is often used. The developed post-valve compensation proportional flow distribution valve group is only suitable for load-sensing variable pump systems, and the scope of use is limited

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