Load-sensitive operation system of loading machine

Abstract

The invention relates to a loading machine, in particular to a load-sensitive operation system of the loading machine. An oil outlet of a travelling plunger pump is connected with a first pipeline, an energy accumulator and a two-position two-way electromagnetic reversing valve are connected at one end of the first pipeline in parallel, and the other end of the two-position two-way electromagnetic reversing valve is connected into an oil inlet of a pilot operated valve. A control oil port of the piloted operated valve is connected with a control port of a load-sensitive multi-path valve through a pipeline, an oil outlet of the pilot operated valve is connected with an oil tank, and a feedback oil port of the load-sensitive multi-path valve is connected with a feedback oil port of a working plunger pump. Control oil of the pilot operated valve in the load-sensitive operation system of the loading machine is supplied by an oil compensating pump in the travelling plunger pump, and one conventional pilot pump for supply oil is omitted and substituted. The working plunger pump adjusts pressure-flow output via the feedback oil port of the load-sensitive multi-path valve according to load changes, engine power is effectively utilized, temperature rise of hydraulic oil is controlled, and energy saving and environment friendliness are realized.

Description

technical field [0001] The present invention relates to loaders, and more particularly to load-sensitive steering systems for loaders. Background technique [0002] At present, major domestic manufacturers generally use mechanical switch valves for the selection of loader control systems. This structure will produce defects such as large control force, empty travel, and poor fretting of the working device. These defects will cause the driver's labor Intensity increases, causing driver fatigue to work and causing potential safety hazards. [0003] In foreign countries, especially in developed countries such as Europe and the United States, pilot control is often used to control loaders, and the pilot oil source is supplied by an independent pilot pump. By manipulating the pilot valve, the pilot oil is used to push the main valve core to realize the action of the arm and bucket of the loader. This kind of manipulation method is very light, reduces the labor intensity of the d...

AI Technical Summary

Problems solved by technology

By manipulating the pilot valve, the pilot oil is used to push the main valve core to realize the action of the arm and bucket of the loader. This control method is very light, reduces the labor intensity of the driver and is easy to realize accurate positioning of the boom and bucket, but This structure also naturally has inevitable defects: due to the use of an independent pilot pump oil supply technical solution, on the one hand, it causes an increase in design cost, on the other hand, it also leads to a complex structure, which increases the number of failure points of the whole machine

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