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Excavating machine starting control method and device thereof

An excavator and oil port control technology, which is used in earthmovers/shovels, construction, etc., can solve the problems of expensive preheating devices and increase maintenance costs, and achieve light load, reduce pressure loss, and start easily. Effect

Inactive Publication Date: 2011-10-12
SANY HEAVY MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of preheating devices is expensive, and it is necessary to add a control circuit for the preheater, which increases maintenance costs

Method used

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  • Excavating machine starting control method and device thereof
  • Excavating machine starting control method and device thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one: see figure 1 As shown, an excavator startup control device includes an electromagnetic reversing valve 3 and two hydraulic control check valves. The oil inlet P of the electromagnetic reversing valve 3 is connected to the oil outlet of the pilot oil pump P3. The output port A of the directional valve is connected to the control oil port of the hydraulic control check valve, the oil return port T is connected to the oil return pipeline, and the control end of the electromagnetic directional valve 3 is connected to the excavator controller; corresponding to P1 and P2 oil pumps The connecting pipeline between the oil outlet of the oil outlet and the working spool 5 is respectively connected with a hydraulic control check valve, and the oil port B of the hydraulic control check valve is connected with the oil outlet of the corresponding oil pump, and the hydraulic control check valve Connect the oil outlet A of the valve to the oil return pipeline.

[0029]...

Embodiment 2

[0036] Embodiment 2: In this embodiment, the structure of the hydraulic system is the same as that of Embodiment 1, the difference lies in its control method:

[0037] (1) The controller issues a start command, the electromagnetic reversing valve is energized to work, and the pilot oil output by the pilot oil pump is output from the output port A of the electromagnetic reversing valve;

[0038] (2) The pilot oil flows into the control oil port X of the hydraulic control check valve, and the hydraulic control check valve is opened, so that the oil outlets of the P1 and P2 oil pumps are connected with the oil return pipeline, and the pressure oil is bypassed and returned to tank 6;

[0039] (3) When the energization time of the electromagnetic reversing valve reaches the rated time, the controller cuts off the power supply of the electromagnetic reversing valve, and the pilot oil flows into the oil return pipeline through the oil return port T;

[0040] (4) The hydraulic control...

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PUM

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Abstract

The invention discloses an excavating machine starting control device, which is characterized in that the excavating machine starting control device comprises an electromagnetic directional valve and a pilot operated check valve, wherein the electromagnetic directional valve is connected with a pilot oil pump, an output opening A is connected with a control oil opening X of the pilot operated check valve, an oil return opening T is connected on an oil return pipeline, the pilot operated check valve is connected in parallel on an oil outlet opening of the oil pump, and an oil opening A of the pilot operated check valve is connected on the oil return pipeline. An operation and control method comprises the following steps: (1) a controller sends out commands, the electromagnetic directional valve is electrified, and the pilot oil is output from the opening A; (2) the pilot operated check valve is opened so that the oil outlet opening of the oil pump is communicated with the oil return pipeline; (3) a power supply of the electromagnetic directional valve is cut down when the rotating speed of an engine reaches the working rotating speed or the electromagnetic directional valve works for the rated time; and (4) pressure oil output by the oil pump flows to each work valve core. The invention installs a bypass oil return pipeline, the pressure oil passes by an oil return tank during starting, the accession into a normal hydraulic loop is recovered after the engine is normally started, the pressure loss is reduced, the starting load of the engine is reduced, and the low-temperature starting is realized.

Description

technical field [0001] The invention relates to an excavator control method and its device, in particular to a hydraulic excavator startup control method and its device. Background technique [0002] Hydraulic excavator is a common construction machinery, which has been widely used in various industries such as construction and water conservancy. Its power part is mainly composed of an engine and a hydraulic pump. The engine drives the oil pump to rotate. The pressure oil at the outlet of the oil pump is distributed to each working device through the working valve core. After the pressure oil does work, it returns to the oil tank at low pressure. [0003] In order to put a stationary engine into a working state, the crankshaft of the engine must be turned by an external force first, so that the piston starts to move up and down, and the combustible mixture is sucked into the cylinder, compressed and ignited, and the volume expands rapidly to generate powerful power, which pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/22
Inventor 戴晴华陈克雷谭伟俊
Owner SANY HEAVY MACHINERY