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Crane and its load sensitive hydraulic control system

A hydraulic control system and load-sensitive technology, which is applied in the direction of mechanical equipment, load suspension components, fluid pressure actuators, etc., can solve the problem of oscillation in dynamic characteristics, affecting crane lifting performance, fretting safety, and poor stability and other problems to achieve the effect of eliminating the peak value, improving the pilot oil source and improving the working stability

Active Publication Date: 2012-02-01
XUZHOU HEAVY MASCH CO LTD
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] As we all know, the operating conditions of the crane are relatively complicated, especially when the medium and long arms are lifting heavy objects, the instability of the load pressure, the vibration of the boom and the wire rope, and the pulsation of the working pressure of the variable pump make the dynamic characteristics of the system often Oscillation occurs and the stability is poor, which affects the lifting performance, fretting and safety of the crane

Method used

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  • Crane and its load sensitive hydraulic control system
  • Crane and its load sensitive hydraulic control system
  • Crane and its load sensitive hydraulic control system

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Embodiment Construction

[0025] The core of the present invention is to provide a load-sensitive hydraulic control system to eliminate the influence of the load pressure fluctuation peak value and effectively reduce the pressure fluctuation of the feedback oil circuit, so as to realize the pressure and flow pulsation of the pump output is small, and the action of each actuator has no jitter .

[0026] The present embodiment will be described in detail below in conjunction with the accompanying drawings.

[0027] See figure 2 , which is a working principle diagram of the load-sensing hydraulic control system in this embodiment.

[0028] The load-sensing hydraulic control system includes a multi-way directional control valve 1 , a load-sensing pump 2 with a load-sensing valve 21 , a damping valve 3 , an oil tank 4 and other main functional components. Among them, the liquid inlet P of the multi-way directional control valve 1 communicates with the liquid outlet A of the load-sensing pump 2, and its d...

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Abstract

The invention discloses a load sensitive hydraulic control system, comprising a multipath directional control valve and a load sensitive pump having a load sensitive valve, wherein, a liquid inlet and an oil drain port of the multipath directional control valve are respectively communicated with a liquid outlet and an oil tank of the load sensitive pump, a load feedback port of the multipath directional control valve is communicated with a sensitive cavity of the load sensitive valve, and each uniting valve oil port of the multipath directional control valve is respectively connected with the corresponding executive component; the passage between the load feedback port of the multipath directional control valve and the sensitive cavity of the load sensitive valve is provided with a damper valve; the oil duct between an oil inlet and an oil outlet of the damper valve is provided with at least two dampings, and the oil duct between the adjacent two dampings is provided with a chamber having an enlarged cross section; and the oil outlet is communicated with the load feedback port of the multipath directional control valve, and the oil inlet is communicated with the sensitive cavity of the load sensitive valve. In addition, the invention provides a crane having the load sensitive hydraulic control system.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a crane and a load-sensitive hydraulic control system thereof. Background technique [0002] With the progress and development of hoisting machinery, higher and higher requirements are put forward for hydraulic control technology; Speed ​​and compound action manipulation requirements. [0003] In view of the above problems, the existing cranes adopt load sensing system technology, which includes load sensing pumps and load sensing valves, by detecting load pressure, flow and power change signals, and feeding the signals back to the load sensing pumps to achieve energy-saving control, in order to Minimize pressure and flow loss. [0004] See figure 1 , which shows a simplified schematic diagram of an existing closed center load sensing system. Among them, the one-way valve 31 of the multi-way valve 30 makes the pressure of its load feedback port XL the highest pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C13/20F15B13/02
Inventor 史先信刘邦才周飞胡小冬
Owner XUZHOU HEAVY MASCH CO LTD
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