The Specific Scheme Of The Electro-Hydraulic Integrated System Of Hydraulic Lifting Equipment Is Det

2021-04-13 11:51

At present, the electro-hydraulic integrated control system has achieved great development, and its manifestations are also diverse. According to the different electro-hydraulic control valves used in the system, the electro-hydraulic integrated control system can be divided into electro-hydraulic servo control system and electro-hydraulic control system. Proportional control system and electro-hydraulic digital control system. Among them, the electro-hydraulic servo control system has fast response and high accuracy, and is used in closed-loop control of actuators; electro-hydraulic proportional control system has faster response and higher precision, and is mainly used for open-loop control of actuators; the performance of electro-hydraulic digital control system and microcomputer , The performance of the drive power supply and the digital valve is related, the response is faster, the accuracy is higher, but the cost is high and the control is complicated. After analysis and comparison, it is determined that the preliminary scheme of the electro-hydraulic integrated system of hydraulic lifting equipment is an electro-hydraulic servo control system.

The electro-hydraulic servo control system is a closed-loop control system composed of an electrical signal processing part and a hydraulic power output part. It combines the advantages of both electrical and hydraulic, and has the advantages of high control accuracy, response, flexible signal processing, large output power, compact structure, and light weight. According to the controlled physical quantity, the electro-hydraulic servo control system can be divided into speed servo control system, position servo control system, force or pressure servo control system.

Since the core system hydraulic drive system of hydraulic lifting equipment is a speed control system, this article finally determines that the key to realize the electro-hydraulic integration of hydraulic lifting equipment is the electro-hydraulic speed servo control system, so that the electro-hydraulic integrated control system of hydraulic lifting equipment can also be called hydraulic The electro-hydraulic speed servo control system of the lifting equipment.

The hydraulic drive system of the hydraulic jacking device is a typical high-inertia, time-varying high-order system, and its dynamic performance is greatly affected by the load. Since the open-loop control cannot predict the impact of various interference signals on the output, it cannot be compensated. , It is difficult to achieve satisfactory results, so this electro-hydraulic speed servo control system adopts a speed feedback large closed loop; at the same time, the manual control method of the existing hydraulic lifting equipment is replaced by computer control, and the instruction signal and speed feedback signal given by the computer are combined The deviation signal is amplified and processed by the servo amplifier to control the electro-hydraulic servo valve.