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Control method and device for reducing starting load of excavator

A control method and technology for excavators, which are applied in the directions of earthmoving machines/shovels, construction, etc., can solve the problems of expensive preheating devices, increase maintenance costs, etc. Effect

Inactive Publication Date: 2010-12-01
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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  • Control method and device for reducing starting load of excavator
  • Control method and device for reducing starting load of excavator
  • Control method and device for reducing starting load of excavator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment one: see figure 1 , 2 As shown, a device for reducing the starting load of an excavator includes a solenoid valve control switch 1 and a solenoid valve 2, the oil inlet P of the solenoid valve 2 is connected to the oil outlet of the pilot oil pump, and the output of the solenoid valve 2 Port A is connected to the control oil port X of the spare valve 3, and the oil return port T of the solenoid valve is connected to the oil return pipeline.

[0018] see figure 1 As shown, when the solenoid valve control switch 1 is not opened, the solenoid valve 2 is closed. When the engine is started at low speed, because the solenoid valve spool is not opened, there is no pilot pressure to push the backup valve to open, so the flow generated by the pump before the engine starts immediately passes through The bucket confluence valve and negative feedback valve are throttling and then flow back to the fuel tank; the flow generated by the rear pump is throttled by backup val...

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PUM

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Abstract

The invention discloses a control method for reducing the starting load of an excavator, which is characterized in that: an electromagnetic valve control switch is turned on, when the excavator starts; a pilot oil pump outputs pilot pressure oil from an electromagnetic valve port A and the pilot pressure oil flows into a standby valve to push the standby valve to start; a rear pump outputs hydraulic oil to an oil port BO of the standby valve through the standby valve; a bypass oil return pipeline is formed by communicating the oil port BO and an oil port AO of the standby valve; the hydraulic oil flows back to the standby valve from the oil port AO and then flows back to an oil tank to complete the starting process; the device for reducing the starting load of the excavator comprises the electromagnetic valve control switch and an electromagnetic valve, wherein an oil inlet P of the electromagnetic valve is connected to an oil outlet of the pilot oil pump; an output port A of the electromagnetic valve is connected with a control oil port X of the standby valve; and an oil return port T of the electromagnetic valve is connected to the oil return pipeline. By arranging the bypass oil return pipeline, the hydraulic oil bypasses an oil return box when the device is started, so the loss of the pressure and the starting load of an engine are reduced and the starting is realized at the low temperature.

Description

technical field [0001] The invention relates to an excavator control method and device, in particular to a control method and device for reducing the start-up load of the excavator. 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 pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22
Inventor 戴晴华权喜
Owner SANY HEAVY MACHINERY
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