Surface grinder can add frequency converter, what are the advantages and disadvantages?
Three frequency converter successfully used in NC machine toolsIn recent years, with the rapid development of the economy, the machine tool industry has also made rapid progress: it is reflected in the wide application of new technology and the obvious improvement of enterprise benefit. At present, the mainstream of consumption in machine tool industry is CNC machine tools. From the domestic and international market demand for CNC machine tools, after the NC machine tool market has the following characteristics: first, the economic CNC machine tools is the mainstream of the future products. Two, using new technology to reduce costs and improve product stability is the key to enterprise survival. Below we in the machine tool drive aspect uses the frequency control speed to say SAJ frequency changer in this profession application situation:
SAJ inverter in the industry's specific applicationZhejiang Kanmen machine tool factory mainly produces all kinds of economic type simple NC machine, due to the higher failure rate of electromagnetic clutch speed regulation, realize VVVF system has more advantages, so using VVVF inverter to achieve the three. The details are as follows:
The use of variable frequency speed control, you can simplify the gear, gearbox and other complex mechanical drag mechanism, high degree of automation, simple operation, easy maintenance.The frequency converter adopts the external terminal control, and the DC 0-10V signal issued by the numerical control system is fed into the frequency converter through the VI ACM terminal of the frequency converter, and the digital setting speed is controlled to the analog variable frequency output. The motor speed is controlled by the size of the voltage signal produced by the numerical control system.The frequency converter has voltage (DC0 - 10V), current analog input interface, and can be well matched with the control signal of CNC system.
System overviewA. load - constant power propertyWhen the gearbox changes, the torque varies inversely with the speed. Excluding the loss of the gearbox, it has the characteristic of constant power in the full power range.1) the speed grade speed control box has 8 gears speed: 75, 120, 200, 300, 800, 1200, 15002000r/min.2) the main rated parameters of motor, rated capacity: 3.7KW, rated speed: 1440r/min, load characteristics: constant power3) the control mode is controlled by 8 positions of the 8 handles, so that the four clutches can be divided and joined, and the 8 combinations of gears can be obtained, so as to obtain the speed of the two gears.The overload capacity of B. at low speed is strong, and the rated torque will be much larger than the maximum working torque of the load when the drive system is lowered at low speed, and it has a strong overload capacity
