Aerial ladder fire truck rotary table and leveling control method thereof

Abstract

The invention discloses an aerial ladder fire truck rotary table and a leveling control method thereof. A proportional valve is connected with a leveling oil cylinder. Two tilt angle sensors are arranged on the rotary table. The two tilt angle sensors and the proportion valve are electrically connected with a controller. The output error caused by signal jumping of one tilt angle sensor is eliminated through signal comparison of the tilt angle sensors. The controller monitors the current feedback of the proportion valve in real time. Closed-loop control is conducted on the opening size of the proportion valve. The angular speed of rotary table movement is combined with an automatic proportion valve specialist PID level system to achieve automatic leveling of the rotary table. The aerial ladder fire truck rotary table and the leveling control method are high in applicability, and automatic adjusting of rotary table leveling can be conducted quickly according to the angular speed of the rotary table; detection is conducted through the double tilt angle sensors, the output error caused by signal jumping of one single tilt angle sensor can be eliminated according to signal comparison of the tilt angle sensors, and the security level is increased; the proportion valve current change caused by proportion valve resistance heating can be eliminated through closed-loop control of the feedback current.

Description

technical field [0001] The invention relates to a turntable, in particular to a turntable of an aerial ladder fire truck and a leveling control method thereof. Background technique [0002] The turntable leveling of most aerial ladder fire trucks is realized by adjusting the outriggers, and the level of the turntable is achieved by controlling the extension of the four vertical outriggers. Through the outrigger leveling method, the adjustment angle range is small, and the automatic leveling of the turntable can effectively improve the adaptability to the slope of the vehicle site. The technology of leveling the vehicle through the leveling technology of the turntable is more and more used on fire trucks. got applied. When the aerial ladder fire truck is in rescue, it drives the ladder frame to rotate through the turntable. For the safety of the operators and vehicles on the working platform, it must be ensured that the bottom of the turntable is always level with the ground...

AI Technical Summary

Problems solved by technology

However, even if the parameters are relatively fixed, the leveling effect will be very different when the running speed of the turntable changes; and when the turntable shakes, the output of the inclination sensor will also shake, which will drive the output signal of the controller to fluctuate, resulting in the entire There will be large pressure fluctuations in the hydraulic system, so it is necessary to design a control system with good automatic leveling ability of the turntable

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