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Compared with the DC motor, the explosion-proof is easy, the volume is small, and the cost is low. Although the price of the inverter is relatively high at present, as long as it can stabilize the production and increase the output, it can be compensated. Powerful data acquisition and processing functions make it easy to implement protection and alarm functions. Therefore, the use of variable frequency speed regulation as the roller kiln speed control transmission control is one of the best choices. For example, the roller conveyor drive control system of the high-temperature rapid-fired roller kiln of Shandong Huaguang Group Color Glaze Co., Ltd. adopts the following scheme: segmenting the mechanical part of the 56m long kiln speed control transmission, each section consists of one 715kW The AC motor drives the transmission machinery, and uses a Japanese Mitsubishi IHF universal inverter to centrally control these multiple main circuits composed of multiple motors. One PLC programmable controller outputs according to the input program, and its output signal is used as The input of the inverter control circuit, the inverter controls the main circuit of the transmission motor according to the control input signal. The control scheme sets hand/automatic switching and can be manually/automatically switched when needed. When manual, it can be operated by the panel of the inverter or external frequency device (external potentiometer 420mA, 010V). The frequency corresponds to the running speed of the transmission machine. The operator can adjust according to the variety of the baked product and the glaze color. It fully demonstrates the advantages of easy operation and flexibility. In the automatic state, according to the programmed program, the abnormal condition alarm output, emergency stop, inch motion turn, forward rotation, reverse rotation, overload warning output, frequency coincidence output, idle stop/alarm reset, acceleration (2, 3, 4 speed) Automatic operation such as deceleration (2, 3, 4 speed).
The fan control of the kiln is controlled. The important one is the regulation and control of the pressure distribution in the kiln. The adjustment of the kiln pressure system is generally achieved by adjusting the exhaust fan, cooling fan and residual heat fan. Actuators are often used to control the opening of the fan or the opening of the sluice in the flue (duct). The control method is simple, but it is not economical from the point of view of energy saving. Taking Huaguang Color Glaze Company's daily-use porcelain flame-burning roller kiln as an example, the regulation and control of the kiln pressure system is realized by adjusting the pumping force and flow of the exhaust fan, the residual heat fan and the quenching fan. The adjustment control schemes of these types of fans all adopt the scheme of the main control loop of the inverter controlling the fan. The pressure signal is transmitted to the analog programmable smart meter through the pressure transmitter set at each detection point, and the detection signal is judged according to a preset control program to determine whether the detection signal meets the set value, and when there is a deviation, the adjustment signal is output, and the adjustment signal is output. It is sent to the input end of the inverter, and the inverter automatically controls the output of the main control loop of the fan according to the control input signal. The control scheme sets manual/automatic switching and can be manually/automatically switched when needed. The operator can adjust the fan air volume at any time according to the kiln firing pressure system established by the technician. The frequency converter is used to adjust the fan speed, the control is reliable, the operation is convenient, the maintenance amount is small, and the energy saving effect is remarkable. Especially when the kiln needs to be restarted due to power failure, etc., it is particularly convenient, and the operator only needs to operate in the computer room. All operations can be completed.
After paying attention to the application of the inverter, after several years of application and practice, as long as the inverter is correctly used and maintained, basically no need for large and complicated maintenance. The items that should be noted during use are summarized as follows: The selection of the inverter should determine the control mode of the inverter according to the characteristics of the load. For constant torque loads, such as pumps, fans, and mechanical operation speed adjustments that do not require high speed control accuracy, U/f control should be used. Then select the capacity of the inverter according to the rated current of the motor. Installation and wiring of the inverter The installation of the inverter must ensure that the environmental conditions meet the environmental tolerances specified by the inverter, and ensure that there is sufficient space around it and necessary cooling and ventilation measures. The wiring of the inverter should be correctly connected to the main circuit, control circuit and grounding circuit according to the product specification and control scheme.
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