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This paper introduces the successful application of the Quartet V560 series inverter on the ball mill. This solution fully meets the system control requirements of the ball mill. It has convenient speed regulation, high speed and high precision, stable operation of the equipment, improved work efficiency and remarkable energy saving effect.

In China's ceramic industry, ball mills are used in large quantities and are indispensable important production equipment for material crushing. The ball mill generally has a large power. The system adopts simple power frequency control, requires long grinding cycle, low grinding efficiency, easy over-grinding of materials, and large power consumption per unit product, thus becoming one of the largest power-consuming devices in the ceramic industry. . At the same time, the starting current of the system is large, which has a great impact on the equipment and the power grid, resulting in a large maintenance of mechanical equipment. With the rapid development of frequency conversion speed regulation technology, frequency conversion speed regulation has been widely used in ceramics, cement and metallurgy industries. Practice has proved that the ball mill adopts frequency conversion control and energy saving effect is remarkable, which can create very good economic benefits for the enterprise. This article takes the Quartet V560 series inverter as an example to introduce a frequency conversion control application scheme of the ball mill.

First, the process introduction

The ball mill is mainly composed of a transmission device, a cylinder device, a feeding device, a discharging device and an electric control device. When the equipment is running, the motor is driven by the electric control device, and then the reduction gear of the reducer and the surrounding large wheel are used to drive the cylinder device to rotate. The material and the grinding body contained in the cylinder device are lifted to a certain height under the action of centrifugal force and friction generated during the rotation, and then fall along the approximate parabola trajectory to impact and grind another part of the material at the bottom of the cylinder, and generate A certain axial operation causes the material to be ground and mixed evenly. The finished material is finally removed by the unloading device for the next process. The grinding process is shown in Figure 1 below.

figure 1

The power frequency control of the ball mill system has the following drawbacks in use:

1. The required grinding cycle is long, the grinding efficiency is low, the power consumption per unit product is large, and the transition grinding of materials is easy to occur;

2. Startup generally adopts star triangle or auto-coupling step-down start, the starting current is large, and the impact on equipment and power grid is great;

3. The stability of equipment operation is poor, the maintenance volume and power consumption are huge, which increases the maintenance cost of the manufacturer and causes serious waste of resources.

Second, the control program

According to the problems existing in the original working condition of the ball mill and the production process and process characteristics, the system control scheme using the four-way V560 series inverter is designed as follows:

The main motor is driven by a vector inverter. The built-in optimized control program automatically adjusts the parameters of the motor during operation according to the real-time running load of the ball mill to optimize the shaft power of the motor. The system speed can be set to the automatic adjustment mode according to the change of the ball milling process condition, which can effectively save energy while ensuring the working efficiency of the ball mill.

The control electrical diagram is shown in Figure 2 below:

Third, the program features and advantages

1. After the ball mill uses the frequency conversion speed regulation, the soft start of the system is realized. The starting current is greatly reduced, which is 3 to 5 times smaller than the previous power frequency control, eliminating the impact at the start, prolonging the service life of the mechanical components, reducing the maintenance and maintenance costs of the equipment, and reducing the power grid and Impact of peripheral equipment;

2. Using variable frequency vector speed control technology to drag, meet the characteristics of low speed running and large starting torque of ball mill, and effectively guarantee the control technology of the system;

3. It is convenient to set the grinding time, grinding time and automatic stop function through the inverter to make the operation more intelligent and humanized;

4. The energy saving effect is generally about 8% to 10%;

5. The system has perfect protection functions such as phase loss, short circuit, over voltage, over current, etc. At the same time, it can be installed with mains/energy saving switching function to effectively ensure the stable operation of the equipment.

Fourth, the conclusion

This paper introduces a variable frequency drive scheme of ball mill based on four-way V560 inverter. This scheme realizes the soft start of the system, effectively guarantees the system control process and improves the work efficiency, and the energy saving effect is remarkable, and the service life of each system is effectively extended. , reducing the amount of equipment maintenance, and achieving good economic benefits for customers. Practice has proved that the program has a very broad application prospect in the ceramic industry, and has been successfully applied to the system of multiple ball mill frequency conversion transformation.

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