Energy-saving control system for excavator

Abstract

The invention relates to an energy-saving control system for an excavator. The energy-saving control system for the excavator comprises an engine, a main pump (1), a pilot handle, a pilot pressure pump (2), a pilot control valve (4), a controller, a main control multi-way valve (3) and an actuator, wherein the main pump controls the actuator through the main control multi-way valve, and a pressure sensor is arranged on an oil path for connecting the main pump with the actuator; signals are transmitted to the controller by the pressure sensor, and the main pump is an oil pump controlled by negative feedback; the flow rate of the main pump is adjusted according to the pressure of a negative feedback oil path, and an electromagnetic proportional pressure reducing valve (7) and a shuttle valve (8) are arranged on an oil path for communicating the output end of the pilot handle with the main pump; the flow rate of the main pump is sequentially controlled by the electromagnetic proportional pressure reducing valve and the shuttle valve in a pilot oil path. By a mode of combining positive flow rate control and negative flow rate control, adequate power can be provided for the excavator, and the energy-saving purpose is achieved.

Description

technical field [0001] The invention relates to an energy-saving control system of an excavator, which belongs to the field of engineering machinery control systems. Background technique [0002] An excavator is a construction machine that uses a bucket to dig materials higher or lower than the bearing surface and load them into transport vehicles or unload them to the stockyard. The operating environment is harsh and the load fluctuates frequently, so the overload capacity and durability of the engine The requirements of other aspects are more stringent than general construction machinery. With the advancement of technology, the transmission efficiency of the excavator hydraulic system has been significantly improved, but the fuel consumption of the excavator has not been significantly reduced. [0003] There are three main control methods commonly used in excavators: positive flow control, negative flow control and load sensor control. Positive flow control uses a positi...

AI Technical Summary

Problems solved by technology

Its disadvantages are: this control method can only control the output power of the pump according to the valve with the largest opening, and the other valves do not participate in the control process regardless of the opening.

Its advantages are: the structure of negative flow control is simple, and it can use the engine power to automatically adjust the pump flow according to the load, which has a certain energy-saving effect; its disadvantages are: the flow fluctuates greatly during use, the response time is long, and the control performance is poor.

The control oil pressure is provided by the control pump, and the oil pressure is controlled by the NC valve in inverse proportion to the pressure difference of the jet valve, but the control structure of the load sensor is complicated and the scope of application is narrow

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