A super-large tonnage excavator pilot control oil circuit and control method

A technology with pilot control and super-large tonnage, which is applied to earth movers/excavators, mechanical equipment, engine components, etc. It can solve the problems of hydraulic energy consumption, reduce energy consumption, and avoid high-pressure overflow

Active Publication Date: 2022-05-10
XUZHOU XCMG MINING MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, according to different working conditions, the existing pilot system is often in the state of high pressure overflow, which consumes hydraulic energy

Method used

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  • A super-large tonnage excavator pilot control oil circuit and control method
  • A super-large tonnage excavator pilot control oil circuit and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A super large tonnage excavator pilot control oil circuit,

[0027] The pressure oil of the pilot pump is respectively connected to the 10Psv port of the variable pump, the solenoid valve A2, and the solenoid valve A1;

[0028] The first oil outlet of the solenoid valve A2 is connected to the fuel tank through the throttle valve 9, and the second oil outlet of the solenoid valve A2 is respectively connected to the solenoid valve group 1 and the overflow valve 6;

[0029] The oil outlet of the solenoid valve A1 is connected to the motor in the butter filling system; a check valve S1 is installed in the oil circuit between the pressure oil of the pilot pump and the solenoid valve A1; a check valve S1 is installed in the oil circuit between the solenoid valve A1 and the motor in the butter filling system A pressure reducing valve 4 is installed in the oil circuit, and the pressure reducing valve is an adjustable pressure reducing valve, so as to prevent the motor from bein...

Embodiment 2

[0032] A super-large-tonnage excavator pilot control oil circuit control method, on the basis of the first embodiment above, includes the following steps:

[0033] In this embodiment, the solenoid valve A2 is used to switch between high and low pressure;

[0034] After the excavator starts,

[0035] When the safety handle is not opened, the solenoid valve A1 is energized; the pressure oil of the pilot pump first returns to the oil tank through the solenoid valve A2 and the throttle valve 9, and the back pressure is generated through the throttle valve, and the pressure is 20 bar, which is the enabling of the variable displacement pump 10 The control port Psv and the oil supply of the butter filling system; specifically: the second channel of pilot pump pressure oil controls the enable control port Psv of the variable pump 10, so that the variable pump 10 starts to work; the third channel of pilot pump pressure oil passes through the one-way Valve S1, solenoid valve A1, pressu...

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Abstract

The invention discloses a super-large-tonnage excavator pilot control oil circuit and a control method, belonging to the field of engineering machinery. The pressure oil of the pilot pump is respectively connected to the Psv port of the variable pump, the solenoid valve A2, and the solenoid valve A1; The flow valve; the oil outlet of the solenoid valve A1 is connected to the motor in the butter filling system; the solenoid valve group is connected to the variable pump Pi port, Pp port and the main valve pilot valve group. In the present invention, after the excavator is started, the pilot oil circuit provides suitable pressure to different mechanisms according to the actual working conditions, avoiding the long-term high-pressure overflow of the pilot system and reducing energy consumption; The valve is periodically controlled to make the various mechanisms of the excavator lubricate efficiently, and the drive oil circuit of the butter filling system is provided with a pressure reducing valve, so that the pressure of the drive motor is not affected by pressure switching.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a super-large tonnage excavator pilot control oil circuit and a control method. [0002] technical background [0003] The pilot system of super-large tonnage excavators is different from that of small and medium-sized excavators. The pilot system not only provides pilot pressure for the control of the main valve, but also provides pressure for the enable control port, power and displacement control port, and butter system of the main pump. Different functions require different pressures. The pilot control oil port of the main valve requires a pressure of about 50 bar, while the enabling control port of the main pump and the driving pressure of centralized lubrication only need 20 bar. Therefore, according to different working conditions, the existing pilot system is often in a state of high-pressure overflow, which consumes hydraulic energy. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/00F15B13/02F15B13/043F15B1/02F16N7/38E02F9/22
CPCF15B11/00F15B13/02F15B13/025F15B13/043F15B1/021F16N7/38E02F9/22F15B2211/6355
Inventor 胡义秦家升石立京刘松阳史继江王春磊李志鹏王正华吕建森李寿鹏唐晓鹏李县军刘邓孙文庆周显周开坤高旭刘凯郑杨
Owner XUZHOU XCMG MINING MACHINERY CO LTD
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