# Parameter Calibration and System Design of Material Lifting System for Inclined Shaft Construction
## 3 System Design  
### Control System Design  
According to the Safety Requirements for Mine Hoists and Mine Hoisting Winches (GB20181-2006), the electromechanical control system of hoisting devices shall conform to the following provisions:  
1. The main control system can maintain a stable working condition and accurately calculate the operating parameters and position of the mine car, and can balance the main operating parameters, such as the operating speed of the mine car, the operating temperature of the hoist, the operating speed of the motor and other equipment working parameters, so as to avoid the safety risks caused by uncontrolled work. 2. The main control system must be able to accurately control all the operating parameters of the hoist, including mine car speed, motor current, hoist hook number, motor speed and other parameters to ensure the safety and efficiency of the hoist system at work. 3. The main control system must have a high degree of safety and reliability to ensure the safe operation of the equipment in the process of mine car hoisting. When the equipment parameters exceed the safety threshold, the main control system can send a signal to remind the operator in time and automatically perform safe braking operation. 4. The main control system should be able to adapt to the complex construction environment and ensure the flexibility of the work of the main control system through continuous debugging in different working environments. 5. The main control system should be simple and reliable, with a high degree of safety. The operator should follow the operation specification when manipulating the system and develop the corresponding operation procedure according to the safety regulations. Figure 3: Physical diagram of the skywheel. (6) The main control system should provide the operator with a simple and easy to understand display interface and easy to understand operating functions, so that the operator's eyes do not need to explore too much and can achieve simple control operations. At present, there are mainly three design schemes of common electric control, dual PLC and frequency electric control for inclined shaft hoisting control systems, and their main performance is compared as follows:  
1. Ordinary electric control system Main configuration: Stator screen, rotor screen, relay screen, etc. Working principle: Connect the resistor in the rotor of the hoist and use the control equipment to adjust the speed by slowly dividing the resistor. The advantage of the ordinary electronic control system is that the cost is small and the system is simple and easy to maintain; the disadvantage is that the system operates on the loss of resources and poor regulation performance. 2. PLC electronic control system Main configuration: Power commutation cabinet, operation desk, sub-PLC console, speed generator, etc. Working principle: Using two PLC systems with mixed control, through the digital module to receive and output high-speed pulse signal, can accurately calculate the specific position and operating status of the slope mine car, digital, information technology, etc. to provide safety protection, speed control and other functions for the slope hoisting system. The advantages of PLC electronic control system is safe and reliable equipment, small size, low energy consumption and strong versatility. The disadvantages are that the costs are high and the technology is relatively complicated. 3. Variable frequency electric control system Main configuration: Operation desk, high-voltage switchgear, PLC control cabinet, etc. Working principle: Using frequency conversion technology to convert the industrial frequency power supply to AC power supply and change the running state of the motor by adjusting the stator frequency. The advantages are good energy saving, high control precision and stable working condition. The disadvantage is that the high harmonics of the inverter output has a certain negative impact on the motor operation.