Method and device for vibration reduction of arm support

Abstract

The invention discloses a method and a device for vibration reduction of an arm support. The method comprises the following steps that a pressure value P required by each cavity of an oil cylinder iscalculated in real time when the arm support is in static balance in a current position state and under a load; when the set conditions that a variable-amplitude oil cylinder electromagnetically controls a reversing valve to be in a closed state and the oil pressure of the variable-amplitude oil cylinder is greater than P1 are simultaneously met, an electro-hydraulic proportional pressure overflowvalve is opened, the opening pressure of the overflow valve is synchronously set as P1; when the oil pressure of the variable-amplitude oil cylinder is stable and smaller than or equal to P1, the electro-hydraulic proportional pressure overflow valve is closed, the overflow valve is used as a stop valve, the vibration reduction process is finished; and the device at least comprises a lifting armsupport and the variable-amplitude oil cylinder, the variable-amplitude oil cylinder is a hydraulic oil cylinder, one end of the variable-amplitude oil cylinder is connected with the arm support, a balance valve is arranged on the variable-amplitude oil cylinder, and overflow valves are arranged on a rod cavity and a rodless cavity of the variable-amplitude oil cylinder correspondingly. The methodand the device for vibration reduction of the arm support are suitable for vibration reduction when the arm support stops suddenly in various working states.

Description

technical field [0001] The invention relates to a method and device for vibration reduction of a boom, and belongs to the technical field of fire safety. Background technique [0002] With more and more frequent fire rescue work, firefighters have higher and higher requirements for the safety and comfort of rescue equipment. As the main equipment for high-altitude fire fighting and rescue, elevating fire trucks, the movement speed, movement stability, stop accuracy and stop stability of the boom are the main indicators to measure its movement performance. The speed of action can be solved by increasing the flow rate of the hydraulic system, and the stability of the movement can be solved by the hydraulic balance valve, which is already a mature technology. The stopping accuracy and stopping stability of the boom, that is, the vibration damping performance of the boom, is a problem that most manufacturers need to solve urgently. [0003] As we all know, the jib is a cantile...

AI Technical Summary

Problems solved by technology

The shaking of the boom will aggravate the panic of the operator and the rescued, and affect their normal rescue work. Severe shaking will also make the whole vehicle unstable, resulting in a serious accident of overturning

[0004] At present, there are two common methods of boom vibration reduction. One method is to decelerate and stop the movement of the boom through the slope mode of the electrical control system. The defect of this method is that if the slope is set too long, the boom will stop. If the accuracy of the position is too poor, it will deviate from the required working position, and even cause the risk of collision with external obstacles. If the slope is set too short, the shaking of the jib will not be effectively controlled, that is, when the slope ends, the jib will Still shaking, because the slope parameters that need to be set for the boom under various working conditions are different, and the slope setting cannot be adjusted in real time according to the working status of the boom, so this method has great limitations

Another method is to use a buffer cylinder. The disadvantage of this method is that the buffer cylinder can only work when the cylinder is stretched or retracted to the limit position, and it does not work for the middle position, so the practicability is too poor

Images