The main methods for detecting the load of the mill are the acoustic method, the vibration method and the power method. The first two methods are mainly used to detect the load of the ball mill and the rod mill; the power method is commonly used to detect the load of the self-grinding mill and the gravel mill. There is a clear correlation between the load of the acoustic grinder and the sound when it is rotated. The load of the grinder can be determined by detecting the sound. When there is only grinding medium in the grinding machine and no material (commonly known as “emptyâ€), its sound is loud and crisp; as the material increases, the sound is reduced; when the load is overloaded (commonly known as “flatnessâ€), the sound is small. Dull, sound intensity is the most basic parameter to reflect the strength of sound, but it is difficult to measure, you can use sound level meter to detect sound pressure instead; sound level meter is more expensive, mostly used for experimental research. Beneficiation plant commonly known means for detecting sound of the grinding machine "lug", which consists of an acoustic sensor, an amplifier and frequency selective voltage-current converter of three parts. A condenser microphone can be used as an acoustic sensor. Because of its low power, it is replaced by a horn loudspeaker. Its low price, ruggedness and high output power. The voltage-current converter outputs a standard DC signal. In addition to indicating the load of the mill, it can also be compared with a given value to generate an alarm signal. In the automatic control system of the mill, the output signal of the ear is used as the input parameter of the system. The sound method is simple, but it is susceptible to environmental noise. When using it, choose the suitable installation position of the sensor. When the vibratory grinding machine rotates, the medium and material are periodically biased to one side of the grinding barrel, and the vibration generated is related to the load of the grinding machine. Therefore, the vibration of the grinding machine can be determined to determine the load. size. When there are many materials in the grinding machine, the cushioning effect of the material is large, thus reducing the vibration acceleration of the grinding machine; otherwise, the vibration acceleration is increased. The piezoelectric acceleration sensor is mounted on the bearing of the grinding machine. In a certain frequency range, the output voltage of the sensor has a linear relationship with the vibration acceleration of the grinding machine. The voltage signal output by the sensor is converted into a standard DC signal by the transmitter. To indicate the mill load and enter the automatic control system. The power of the motor driven by the power method is related to the load of the mill. The power of the drive motor can be used to determine the load of the mill. During the grinding process, the power consumed by the media and materials in the mill is useful. Because it is difficult to measure, it is often replaced by the active power of the drive motor. The mill has the highest processing capacity at the optimum load and consumes the most power. Power will drop when overloaded or underloaded. Therefore, when measuring the load of the mill according to the power, in addition to measuring the instantaneous power, it is necessary to determine the trend of the change. Most of China's grinding machines are driven by AC power. The practical power measuring devices are mostly three-phase active power transmitters. The secondary side voltage (current) of the transformer connected to the main circuit of the driving motor is input to the transmitter, and the transmitter converts into a standard DC signal corresponding to the active power of the motor, and sends the signal to the extreme value regulator. , control the amount of minerals, so that the mill runs under the optimal load. By using a microcomputer instead of an extreme value regulator, the digital filtering technique can overcome the power fluctuation interference caused by the non-uniformity of the grinding machine operation, and the sensitivity of the power detection is relatively improved. Since the medium load accounts for a major proportion in the ball mill and the rod mill, the power of the mill is not sensitive enough to the change of the material load. Therefore, the power method is mostly used for the self-grinding machine and the gravel mill, but the power method using digital filtering technology and the like is adopted. It can also be used in ball mills and rod mills. sunglasses display stand, sunglasses display rack,eyeglasses display stand, eyeglasses display rack, eyewear display stand, acrylic eyewear display Shenzhen Apex Artcrafts Co,.LTD , https://www.apexdisplaycn.com
The grinder load refers to the instantaneous total load in the machine, including the new ore supply, the cyclic load, the water volume and the medium load. Under normal production conditions, the purpose of testing the mill load is mainly to display and control the new load. Changes in the amount of ore and cyclic loading. The load of the mill significantly affects its grinding efficiency. When the mill is at the optimum load, the efficiency is the highest. Detecting and controlling the load of the mill is an important parameter for the optimal control of the grinding circuit. This parameter is proposed with the need of automatic control and optimal control of the grinding circuit. Therefore, no matter which method is used, the microcomputer automatically controls the detection, and the mathematical model and the detection and adjustment process are programmed into the application software input. In the microcomputer, the model coefficients are determined by calibration.