High and low pressure automatic heating device is a high pressure compressor rotor and low pressure compressor rotor heating equipment, the control system's main function is to achieve high and low pressure heating body automatic heating control and the corresponding fault protection and alarm functions. In this control system, the high pressure part and the low pressure part are designed into two independent control cabinets to improve the using efficiency of the equipment. At present, heating equipment used in the field integrates the heating parts of the high-pressure compressor rotor and the low-pressure compressor rotor in a control cabinet so that the two high-pressure rotors and the low-pressure rotor which are far away from each other can be heated at the same time to be used limitation. And current heating device working voltage of high and low voltage heating body is AC220V, there is a certain security risk. To this end, in order to improve the utilization of the heating device, the high pressure part and the low pressure part of the control system are respectively designed into two independent control cabinets, and the operating voltage of the high and low voltage heating body is set at DC48V, which greatly improves System security. 1 high and low voltage automatic heating device electrical control system works High and low voltage automatic heating device control system to achieve high-pressure rotor and low pressure rotor according to process requirements of automatic heating function, but also have a variety of fault protection. And the completion of the heating work or temperature is too high, the system will automatically stop heating and send alarm signal. In addition, in case of emergency, the control system also has emergency stop function. The key issues in the control system of high and low pressure automatic heating devices lie in the accuracy of temperature measurement and the accuracy and stability of heater temperature control. 1.1 temperature measurement In industrial production, the thermal resistance is the most commonly used in the low temperature zone of a temperature detector, the main features of the measurement accuracy, stable performance. Platinum RTD measurement accuracy of which the highest, it is not only widely used in industrial temperature measurement, but also made a standard benchmark. Thermal resistance is the use of its resistance value changes with temperature on the principle of the amount of temperature converted into resistance of the temperature sensor. By applying a known excitation current to the thermal resistor to measure the voltage across it, the resistance value is measured, and then the resistance value is converted to a temperature value according to the temperature profile, thereby achieving the temperature measurement. The control system uses thermal resistance for temperature measurement, each heater has two thermal resistance, improve the reliability of temperature measurement. 1.2 PID control technology In engineering practice, the most widely used regulator control laws for the proportion, integral, differential control, referred to as PID control, also known as PID regulation. PID controller with its simple structure, good stability, reliable, easy adjustment and become one of the major industrial control technology. When the structure and parameters of the controlled object can not be fully mastered, or when the accurate mathematical model can not be obtained, when other techniques of control theory are difficult to adopt, the structure and parameters of the system controller must be determined by experience and on-site commissioning. At this time, PID control technology is the most convenient. PID controller parameters automatically adjust through intelligent adjustment or self-tuning, adaptive algorithm to achieve. In this control system, combined with the actual situation on the scene, the use of intelligent regulator for PID temperature control to achieve high and low pressure heating body automatic heating control. In summary, high and low voltage automatic heating device control system is based on the principle of thermal resistance temperature measurement, high-precision intelligent regulator for the control of the core of the automatic control system. It uses high accuracy thermal resistance temperature measurement heating body heating time and temperature, the use of intelligent regulator on the measured temperature parameters PID parameter tuning, to find the best control volume, automatic heating control. When the time is reached, the system will stop heating automatically. When the heating temperature exceeds the upper limit of the process temperature, the system will send an audible and visual alarm signal. 2 control system structure and working process High and low voltage automatic heating device control system of the high-pressure part and low pressure part are independent of each other two control systems, mainly by the heater, temperature measurement and control cabinet components, including the control cabinet, including power supply, intelligent temperature controller, alarm part , Cooling section, indicating section, timing section, fault protection section and control switch section. After the device is powered on, the power indicator is on, then the regulator and the timer are set as required. Press the heating start button, the heating indicator is on and the heater starts to work. When the temperature reaches the lower limit of the working temperature for the first time, the timer starts to count ; When the temperature reaches the upper limit of the operating temperature, the system sends a command, the heater stops heating; when the temperature falls to the lower limit of the temperature, the system will issue a heating instruction, the heater automatically continue to heat; so repeated; timer reaches the set time, stop heating When the heating stop button is pressed, the heating indicator is off and the heater stops heating; during the heating process, if the heating temperature exceeds the upper temperature limit, the system will automatically stop the heating and send an audible and visual alarm signal; Emergency stop button system, in an emergency, press the emergency stop button, the system will cut off the heating power, to ensure safety. Conclusion High and low voltage automatic heating device control system is divided into high-voltage control cabinet and low-voltage control cabinet two independent parts, the use of thermal resistance temperature measurement method, the measured temperature data through the intelligent temperature controller to set and control the heater Of the heating work, the heating temperature control within the required range, to achieve the heater's automatic heating control. At the same time, the control system also has a variety of fault protection and over-temperature alarm function.
Air Hydraulic Jack
An air hydraulic jack is a hydraulic jack that is actuated by compressed air - for example, air from a compressor - instead of human work. This eliminates the need for the user to actuate the hydraulic mechanism, saving effort and potentially increasing speed. Sometimes, such air hydraulic jack are also able to be operated by the normal hydraulic actuation method, thereby retaining functionality, even if a source of compressed air is not available.
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