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Hydraulic system and construction machinery

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: 2016-08-31
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 high-speed operation of the whole machine and the requirements of good fretting performance

Method used

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  • Hydraulic system and construction machinery
  • Hydraulic system and construction machinery
  • Hydraulic system and construction machinery

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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 engineering machinery. The hydraulic system includes a hydraulic pump, a main control valve, a differential pressure regulating valve and a controller; wherein: the differential pressure regulating valve is set between the oil discharge port of the hydraulic pump and the load feedback port of the main control valve to adjust the oil discharge The pressure difference between the port and the load oil port; the input end of the controller is connected to the throttle to receive the throttle signal; the first output end is connected to the differential pressure regulating valve to control the differential pressure adjustment of the differential pressure regulating valve according to the throttle signal . The above-mentioned hydraulic system can control the flow rate of the valve stem of the main control valve according to the magnitude of the throttle signal, so that regardless of whether the engine is at idle speed or at high speed, the adjustment of the flow rate can be realized within the entire stroke of the valve stem of the main valve, that is, the flow rate at idle speed The flow adjustment gain of the main valve is small, and the micro-movement is good. At high speed, the flow adjustment gain of the main valve is large, which meets the requirements of large flow and high speed.

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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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02
Inventor 李小飞潘辉丁锋
Owner SANY AUTOMOBILE HOISTING MACHINERY
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