Hydraulic oil circuit, excavator, and excavator startup control method

Abstract

The invention provides a hydraulic oil circuit, an excavator, and an excavator startup control method. Including: the first solenoid valve; the joystick oil circuit; the oil inlet line of the first solenoid valve is connected between the pilot oil pump and the joystick oil circuit; the first control switch is connected with the first solenoid valve control; when the excavator engine starts , the first control switch is opened, the first solenoid valve is connected, the pilot oil pump drains oil into the fuel tank through the first solenoid valve, and the pressure of the pilot oil pump is maintained at the first oil pressure; after the excavator engine is started, the first control switch is closed, The first solenoid valve is closed, and the pilot oil pump maintains the second oil pressure; the first oil pressure is lower than the second oil pressure. The hydraulic oil circuit and the start-up control method of the present invention are used to discharge the oil in the pilot oil pump into the oil tank through the first control valve when the excavator is started at low temperature in winter or on high mountains, so as to reduce the early load of the excavator engine. With less oil pressure, which inhibits starting, the engine starts easier.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a hydraulic oil circuit, an excavator, and an excavator startup control method. Background technique [0002] As an important construction machine, excavator plays a big role in production and construction. [0003] When the excavator is started on flat ground, since the set engine horsepower / torque can fully withstand the set hydraulic horsepower, there will be no problems at early start in various environments. However, in the case of high mountains, the engine power will be reduced due to air density, especially at low temperatures, the influence of hydraulic viscosity and the set horsepower conditions will make it difficult to start the initial start. When starting, the pilot oil pump will maintain a pressure of about 30 to 35 bar, so starting on a high mountain with low temperature conditions, although there are some problems such as a slight load drop, it is still diff...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the technical problem that the excavator is difficult to start under low temperature and mountainous conditions in the prior art, the present invention provides a hydraulic oil circuit, an excavator, and a start-up control method for the excavator

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