Hydraulic system and engineering machine

A hydraulic system and hydraulic pump technology, applied in the hydraulic field, can solve the problems of difficult high-speed operation of the whole machine and good fretting performance

Active Publication Date: 2014-04-16
SANY AUTOMOBILE HOISTING MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, the existing hydraulic system is difficult to take into account the ...

Method used

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  • Hydraulic system and engineering machine
  • Hydraulic system and engineering machine
  • Hydraulic system and engineering machine

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Embodiment Construction

[0042] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0043] An embodiment of the present invention provides a hydraulic system, including: a hydraulic pump, a main control valve, a differential pressure regulating valve, and a controller; wherein,

[0044] The pressure difference regulating valve is set between the oil discharge port of the hydraulic pump and the load feedback oil port of the main control valve, and is used to adjust the pressure difference between the above oil discharge port and the load feedback oil port; For receiving the throttle signal; the first output end is connected with the differential pressure regulating valve, and is used to control the differential pressure adjustment amount of the differential pressure regulating valve according to the throttle signal.

[0045] In the hydraulic system provided in this embodiment, the hydraulic ...

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Abstract

The invention discloses a hydraulic system and an engineering machine. The hydraulic system comprises a hydraulic pump, a main control valve, a pressure-difference adjusting valve and a controller. The pressure-difference adjusting valve is arranged between an oil discharging port of the hydraulic pump and a load feedback oil port of the main control valve and used for adjusting the differential pressure between the oil discharging port and the load feedback oil port; the input end of the controller is connected with an accelerator and used for receiving signals of the accelerator; the first output end is connected with the pressure-difference adjusting valve and used for controlling the pressure-difference adjusting amount of the pressure-difference adjusting valve according to the signals of the accelerator. According to the hydraulic system, the flow of a valve rod of the main control valve can be controlled according to the signals of the accelerator, so that an engine is either at an idle speed or at a high speed, and the adjustment on the flow within the whole stroke of the valve rod of the main control valve can be achieved, namely the flow adjusting gain of the main control valve is small at the idle speed, and the jogging performance is good; the flow adjusting gain of the main control valve is large at the high speed, and the requirements for large flow and high speed are met.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a hydraulic system and engineering machinery. Background technique [0002] Crane is a kind of machine tool used for lifting and transporting materials. It is widely used in lifting and hoisting operations in construction sites, ports, oil fields, railways, warehouses, wind power and other working conditions. In recent years, with the acceleration of engineering construction, cranes have played an increasingly important role in many industries, and people have paid more and more attention to the improvement of crane micro-motion performance. [0003] At present, most cranes adopt the valve control mode, that is, the flow control is realized by changing the opening area of ​​the main valve stem. In the limited control stroke, the maximum opening design of the valve stem needs to meet the speed requirements of the actuator. In order to keep the flow rate stable, a pressure comp...

Claims

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Application Information

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IPC IPC(8): F15B13/02
Inventor 李小飞潘辉丁锋
Owner SANY AUTOMOBILE HOISTING MACHINERY
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