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A variable amplitude control system and its control method

A control system and control valve technology, which is applied in the direction of load hanging components, cranes, transportation and packaging, etc., can solve the problems of the luffing oil cylinder sliding, impact, and affecting the safety of the crane, and achieve the effect of stable and reliable luffing

Active Publication Date: 2017-09-19
XUZHOU HEAVY MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at the moment of falling and starting, the luffing cylinder is prone to slide and impact, especially when the load is luffing, the strong impact seriously affects the safety of the crane

Method used

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  • A variable amplitude control system and its control method
  • A variable amplitude control system and its control method

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Such as figure 1 , figure 2 As shown, a luffing control system includes: luffing cylinder 1, luffing handle 2, hydraulic oil tank 3, closed variable displacement pump 4, main valve 5, luffing control valve 6, control device 7, first pressure sensor 8. The second pressure sensor 9, the large chamber of the luffing cylinder 1 is connected with the luffing control valve 6, and the phase between the A1 port of the luffing control valve 6 and the oil port A of the closed variable variable pump 4 is passed through the main valve 5. The small cavity of the luffing cylinder 1 is connected to the hydraulic oil tank 3; the first pressure sensor 8 is used to measure the pressure at the A1 port of the luffing control valve 6, and the second pressure sensor 9 is used to measure the pressure of the luffing cylinder 1; the control device 7 is respectively connected with the...

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Abstract

The invention discloses an amplitude-varying control system which comprises an amplitude-varying oil cylinder, an amplitude-varying handle, a hydraulic oil tank, a closed type variable pump, a main valve, an amplitude-varying control valve, a control device, a first pressure sensor and a second pressure sensor, wherein a large cavity of the amplitude-varying oil cylinder is connected to the amplitude-varying control valve; a hole A1 of the amplitude-varying control valve and an oil hole A of the closed type variable pump are connected through a main valve; a small cavity of the amplitude-varying oil cylinder is connected to the hydraulic oil tank; after the control device receives the handle signal, real-time signals of the first pressure sensor and the second pressure sensor are detected for realizing control on the amplitude-varying control valve, the main valve and the closed type variable pump according to a preset control strategy. The amplitude-varying control valve guarantees reliable locking of the amplitude-varying oil cylinder; the pressure sensors are used for detecting pressure at the large cavity of the amplitude-varying oil cylinder and the hole A1 of the amplitude-varying control valve in real time; the control device is used for setting an amplitude-varying dropping safety strategy, so that stable and reliable amplitude-varying is guaranteed.

Description

technical field [0001] The invention relates to a variable amplitude control system and a control method thereof, and belongs to the technical field of crane variable amplitude systems. Background technique [0002] At present, the luffing hoisting of cranes mainly adopts open variable pump or proportional reversing valve to control the speed, and the luffing and falling mainly adopts throttling speed regulation, and the luffing and falling speed is controlled by changing the opening size of the balance valve. [0003] The luffing of the crane is to push the jib to rotate around the rear hinge point through the luffing cylinder. When the no-load luffing falls, the gravity of the jib itself pushes the luffing cylinder to retract. Push down the luffing cylinder to retract. In order to ensure the safety and reliability of the luffing process and the controllable speed of the luffing cylinder, a balance valve is usually installed in the large chamber of the luffing cylinder, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C23/82B66C13/20
CPCB66C13/20B66C23/82B66C2700/03
Inventor 王守伟王冬章钟伟任印美戚厚保
Owner XUZHOU HEAVY MASCH CO LTD
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