The speed monitoring module provides a synchronous analog output terminal, which outputs the speed from the terminal behind the monitor with an analog output of 420 mA. On the one hand, it drives the tachometer on the process site, and on the other hand, it acts as the speed feedback signal of the speed controller; In the BENT-LY3500, the upper limit and the upper limit alarm value are set for each parameter. After the operation, the monitor outputs the switch through the four-channel relay module and sends it to the PLC for interlock operation.
The lubricating oil cooling system and emergency shutdown system of the unit are auxiliary machines of the turboexpander compressor unit. The system is equipped with a lubricating oil pumping station to provide circulating lubricating oil to the unit to provide lubrication and cooling for the bearing. In order to ensure the safe operation of the unit, the temperature of the lubricating oil must be kept within a certain range. In this system, the temperature of the lubricating oil is automatically adjusted by the S7-215 PLC. We use the S7-215 external EM-235 analog input and output module to PID control the temperature of the lubricating oil, adjust the flow of lubricating oil through the cooling tower to ensure that its temperature does not exceed 40e. The PID control parameters are given by the upper computer.
Since the working medium of the unit is flammable and explosive, when the operating parameters of the expansion compressor unit exceeds the limit, the rapid alarm and reliable parking protection are the key issues to ensure the safety of the unit. The system's emergency stop control system is implemented by the S7-215 programmable logic controller. Its input consists of four parts: emergency stop button in the field and central control room for manual emergency stop; on-site switching signal, such as Sealed gas pressure switch, lubricating oil tank level switch, etc. These signals are necessary for normal operation of the system. These signals are interlocked in the S7-215. On the one hand, the alarm signal is output, and the sound and light alarm is performed in the field and the central control room. On the other hand, the emergency stop signal is output, and the control valve XV-1401 is turned off to stop the system.
In the process of machining titanium alloy, the titanium alloy material itself has low modulus of elasticity, large elastic deformation, high cutting temperature, low thermal conductivity and high chemical activity at high temperature, which makes the sticky knife phenomenon serious, easily aggravating the tool wear and even breakage, which leads to the poor machinability of the titanium alloy. Therefore, machining titanium alloy requires proper cutting tools and good machining technology.
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