Abstract
The oil pressure sensors are installed on the hydraulic connection device to monitor the tension of wire ropes. The change of acceleration during the operation process of hoist causes the tension change of each wire rope. It leads to impact on the cylinder of hydraulic connection device, enlarges the pressure loss, and makes the non-linear friction become more complex which affects the monitoring accuracy. In this article, the mathematical model of hydraulic connection device is established. To analyze the dynamic characteristics of the hydraulic connection system, the model of single hydraulic cylinder and hydraulic connection device is established and simulated by AMESim software. Then, the friction and pressure compensation in the working process of hydraulic connecting device are obtained by LuGre friction model and corresponding formulas of pressure loss. Finally, the monitoring system is designed and real-time compensation test is carried out. The results show that the compensation improves the accuracy of the real-time measurement system of wire rope tension.
Highlights
During the operation process of multi-rope friction hoist, excessive tension of wire ropes and lifting load may cause the wire rope abrasion or breakage which may cause cage falling and even casualties
Due to the non-linear friction caused by the motion of piston to cylinder wall and the oil pressure loss caused by the oil flow in the hydraulic connection device, tension measurement results are inaccurate
Taking into account the characteristics of non-linear friction caused by the motion of piston to cylinder wall in hydraulic connecting device, the LuGre friction model is adopted for friction compensation in this article
Summary
During the operation process of multi-rope friction hoist, excessive tension of wire ropes and lifting load may cause the wire rope abrasion or breakage which may cause cage falling and even casualties. Keywords Wire rope tension, oil pressure sensors, hydraulic connection device, friction and pressure compensation, real-time measurement system Oil pressure sensors are installed on the tension balance hydraulic connection device.
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