Optimize Of Hydraulic Oil's Vacuum Filling Of Heavy Truck Cab's Lifting System

Cab lifting system used as the driving and actuating mechanism of the lifting of the heavy truck cab. It's also the support and lock mechanism of the cab when the vehicle is in normal running. As the working medium of the lifting system, the filling quality of the hydraulic oil not only affects the lifespan and working stability of the lifting system, but also directly affects the driving comfort. Therefore, it has great practical significance to optimize the vacuum quantitative filling in the lifting of the heavy truck cab.Firstly, this paper introduces the structure of the lifting system, and emphatically analyzes the structure and working principle of the lifting pump and the lifting cylinder. On this basis, the working principle of the lifting system is deeply analyzed, systematically analyzes the on-off status of the lift check valve and oil pipeline when the lift valve is placed in each position. Experiments show that when the valve is placed in the rising position, it can be filled and can't be vacuumed; When the valve is placed in the down position, can't be filled, can't be vacuumed; When the valve is placed in the middle state, it can be vacuumed, can't be filled.After analyzing the structural characteristics and working principle of the lifting system of the truck cab and the working characteristics of the lifting valve in different positions, the technical process of vacuum filling with lift system is designed to solve the problem of the oil can't be completely refilled into the lifting system in every corner and the oil is mixed with air problems. Respectively vacuum, leak detection, quantitative filling, constant suction level and other process design. vacuum pumps, filling pumps, vacuum sensors, flow meters and other key components of the calculation, selection. The use of programmable logic controller PLC, vacuum sensors and other advanced technology for automatic control of the vacuum dosing system. This system can realize the system vacuum, filling volume, liquid storage tank liquid level automatic information collection, transmission and other functions, realize the automatic lifting system of vacuum, vacuum detection, filling, suction set level, driving automatic lifting system of vacuum quantitative filling control room, greatly improving the work efficiency and the quality of oil vacuum quantitative filling.In this paper, the automatic vacuum quantitative filling equipment is applied to the filling of the oil in the lifting system of the heavy truck cab, and the system is vacuumed to reduce the mixed air in the hydraulic oil. Combined with the characteristics of lifting pump valve placed in each position, Quantitative filling, to ensure that the oil filling to the lifting system in every corner, Filling process automation, enhance the oil filling efficiency, improve the quality of oil filling. Automatic vacuum quantitative filling in the heavy truck cab lifting system oil filling in reflects the very obvious advantages.