For many years, traditional temperature control equipment has generally used moving coil millivoltmeters electronic potentiometers as temperature control instruments, combined with AC contactors. Although the cost is low, there are problems of poor temperature control accuracy high power consumption. The accuracy of temperature control of traditional instruments is low, the temperature control deviation can reach more than ± 10 ℃, which is difficult to ensure the temperature requirements specified by the parts process. The furnace temperature can only be controlled according to the gradient, the heating elements are operated at full voltage full power, which increases the abnormal power consumption of the electric furnace, causing waste of electrical energy, virtually increases the production cost of the enterprise.

    At present, most of the temperature of traditional instruments used are indicated by pointers. The display is intuitive, the accuracy is low, the shock resistance is poor. It needs to be checked repaired regularly. The cost is high. It is very troublesome to change the recording paper every day for the automatic balance recording regulator of the circular chart. It is suitable for continuous process records of more than 24h it is easy to save. Problems such as lack of requirements affect product quality. At the same time, traditional instruments have no time program control, over-temperature alarm other functions, which cannot meet some of the process requirements of heating, heat preservation, cooling at a rate other procedures. Therefore, the old temperature control equipment can no longer meet the needs of modern industrial production. Modern industry must make full use of the intelligent temperature control technology with high precision high automation program to realize the automation of the heat treatment temperature control process. It is very necessary to update the traditional instruments. At present, MZK intelligent temperature control cabinet is a new generation product designed produced with AI LU series artificial intelligence industrial regulator as the core technology. It consists of intelligent instrument, power measuring instrument, thyristor large solid-state relay temperature control unit, AC contactor power supply unit, sensor, switch other parts. MZK series products have a simple circuit modular structure, which is very convenient use, maintenance to expansion functions. System industrial control software Industrial control software uses domestically produced excellent Chinese configuration software MCGS universal version as a development platform, which runs on the Chinese Windows window , It can support most of the hardware such as data acquisition boards, smart meters, PLCs, frequency converters, etc. on the market, with powerful functions.

    The overall structure of the continuous drying furnace system The overall structure of the continuous drying furnace KCS computer distributed control system designed according to the process requirements is shown in the figure. The whole system consists of 6 front furnace control cabinets (including intelligent instruments, programmable controllers, electric heating controllers, various contactors, switches, etc.) 1 upper cabinet (including industrial control machines personal computers printers other auxiliary equipment )composition. The upper computer adopts a cheap personal PC. If the operating environment is poor, it is recommended to use an industrial computer, but the price is higher. The number of control zones is set to 24 points. If the number of heating control zones the increase of equipment can be added to hundreds of points (even infinite points). System communication AI series instruments use RS485 communication interface, the communication distance is up to 1km, connect RS232 / RS485 converter to connect with the host computer. The communication interface is 8-bit data, 1 2 stop bits, no check digit. The data adopts 16-bit summation check, its error correction ability is tens of thousands higher than parity check, which can ensure the correctness reliability of communication data.

    The use of high-precision intelligent instruments can completely replace the functions of existing conventional instruments. More importantly, it can simulate human brain thinking quickly accurately complete tasks that traditional technologies cannot replace. Based on the use of MZK high-precision intelligent temperature control instrument PLC as the lower computer, the corresponding interface connection are selected, the upper computer related peripherals are purchased, the KCS distributed control system can be formed through the industrial control configuration software. This type of system utilizes the perfect functions of the upper computer industrial control software, organically combines with advanced intelligent instruments programmable controllers other lower computers to effectively reliably realize the automatic control of the heating furnace, so that the equipment has a very high technical content Technological level, the system performance is excellent, reliable, low cost, easy to install use, has high promotion value.