Frequency-conversion pump controlled steering hydraulic system for loader

A technology for steering hydraulics and loaders, which is applied to fluid pressure actuating system components, mechanical equipment, accumulator devices, etc. Effect

Inactive Publication Date: 2012-05-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention proposes a new type of loader frequency conversion pump control steering hydraulic system to overcome the deficiency of low efficiency of the existing loader steering system

Method used

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  • Frequency-conversion pump controlled steering hydraulic system for loader
  • Frequency-conversion pump controlled steering hydraulic system for loader
  • Frequency-conversion pump controlled steering hydraulic system for loader

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specific Embodiment approach

[0014] Specific implementation of technical solution 1 of the present invention: when the loader is started, the pressure sensor (14) transmits the pressure signal of the accumulator (12) to the controller (9), and the controller (9) determines that the accumulator ( 12) Whether the pressure meets the requirements. When the pressure in the accumulator (12) is low, the controller (9) controls the AC motor (4) to start, and controls the proportional valve (13) to open, and the three-position four-way reversing valve (10) and the on-off valve (16) are closed, at this time, the quantitative pump (6) is driven by the AC motor (4) to fill the accumulator (12) with high-pressure oil; when the pressure of the accumulator (12) is higher When it is high, the loader can start normal operation. The highest pressure in the accumulator (12) is the overflow pressure of the overflow valve (17), and the lowest pressure should be greater than the average pressure of the steering hydraulic cylin...

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Abstract

The invention relates to a frequency-conversion pump controlled steering hydraulic system for a loader, wherein an alternating-current motor driven constant delivery pump is used as a main oil supply source, an energy accumulator is used as an auxiliary oil supply source. At the initial steering stage of the loader, the energy accumulator supplies oil to a steering hydraulic cylinder independently; after an alternating-current motor is started, the alternating-current motor driven constant delivery pump supplies oil to the steering hydraulic cylinder independently; through the mode, the response speed of a steering system is increased, and the energy consumption is saved at the same time; and after the loader is started, if the pressure in the energy accumulator is lower, the alternating-current motor driven constant delivery pump is used for injecting high-pressure oil liquid to the energy accumulator. The hydraulic system disclosed by the invention has the main advantage of high efficiency.

Description

technical field [0001] The patent of the invention relates to an energy-saving loader steering hydraulic system, which belongs to the field of construction machinery energy conservation. Background technique [0002] At present, there are two main ways to supply oil to the steering hydraulic system of the loader: 1. Use a quantitative pump to supply oil to the steering hydraulic cylinder; 2. Use a variable pump to supply oil to the steering hydraulic cylinder. The advantage of the quantitative pump oil supply method is low cost and high reliability; the disadvantage is that the efficiency is very low, which is between 10% and 30%. The main reasons for the low efficiency are: 1. Taking the domestic 50 loader as an example, for safety reasons, when the engine of the loader is idling (about 750r / min), the quantitative pump should be able to provide enough oil to the steering hydraulic cylinder. When the loader works normally, the engine speed is generally around 1700r / min. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B1/033F15B21/08
Inventor 韩嘉骅谭兆钧姚进
Owner SICHUAN UNIV
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