Frequency conversion control device for starting double crushing hosts by using single frequency converter and method thereof

Abstract

The invention discloses a frequency conversion control device for starting double crushing hosts by using a single frequency converter and a method thereof. The frequency conversion control device comprises a shaping machine and a sand making machine, wherein the shaping machine is equipped with a main motor and a secondary motor; the sand making machine is equipped with a single motor; a controlcircuit of the main motor of the shaping machine is provided with a time relay T1, interlocking relay switches KM1 and KM2 and a time relay T2; an operation circuit of the secondary motor is providedwith relay switch KM3 controlled by the time relay T2 and a time relay T3; the single motor of the sand making machine is provided with a relay switch KM5 controlled by the time relay T3; the time relay T1 and the interlocking relay switches KM1 and KM2 are used for controlling switching of power connection and power disconnection of a frequency starting circuit and a voltage-stabilizing operationcircuit; the time relay T2 and the time relay T3 are used for controlling operation circuits of the secondary motor and the motor of the sand making machine to be successively started; one frequencyconverter is capable of controlling multiple motors to be started, so that the cost is low; the voltage is smoothly started without impact by frequency conversion; the safety coefficient is high; thespeed can be adjusted by frequency conversion; the production efficiency is high.

Description

technical field [0001] The invention relates to a frequency conversion control device and method for starting double crushing main engines by using a single frequency converter, belonging to the technical field of crushing control. Background technique [0002] At present, in the conventional crushing production line, the sand-making crushing section mostly adopts single-main finished sand. Specifically, the material is crushed through the vertical shaft crusher and enters the screening system. The qualified product enters the finished product warehouse through the finished product belt conveyor, and the oversized material passes through the return belt conveyor. It is conveyed back to the vertical shaft crusher for mechanical crushing. The advantage of this conventional crushing production line is that it saves equipment investment, but it has a single function and can only be crushed in a single stage, and gradation adjustment cannot be performed; It is more troublesome t...

AI Technical Summary

Problems solved by technology

The advantage of this conventional crushing production line is that it saves equipment investment, but it has a single function and can only be crushed in a single stage, and gradation adjustment cannot be performed; It is more troublesome to operate than to realize

In addition, if the single host process only produces finished sand, the crushing ratio is small and the output is low

If it is necessary to increase the output, it must be realized by reducing the feed particle size. To reduce the feed particle size, a section of crushing must be added, which will also increase equipment investment.

[0003] In addition, in the crushing production line, when the sand making vertical shaft crusher is started and stopped, the conventional method is a step-down start or soft start method. Since the motor power of the vertical shaft crusher is relatively large, it will have a large impact on the power grid when starting the motor, which is dangerous. The coefficient is high, and it may fail to start when the voltage is lower than 380V, which will affect the stable operation of the crushing production line

At present, some inverters are used to start and stop the host through frequency conversion control technology, which can effectively avoid the impact on the power grid when the motor starts, but each motor needs to be equipped with a corresponding inverter, which leads to high equipment costs and high maintenance costs.

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