In closed-circuit grinding consisting of a grinding machine and a classifier, there is bound to be a cyclic load. In order to ensure a stable concentration and fineness of the mill discharge, the total ore (raw ore) of the mill should be stable and close to a constant, that is, the maximum throughput of the mill. The grinding ratio of the grinding machine is too large or too small to affect the productivity. The production practice proves that when the ratio of returning sand is 100-500%, the productivity of the grinding machine is increased by 20-30%, the ratio of sand returning increases, the productivity of the grinding machine increases slowly, and finally it tends to a limit value. The swelling and grading efficiency of the lattice type ball mill is reduced, which is often caused by the excessive sand return ratio. At present, most sand beneficiation plant back to between 300 to 500% higher productivity than the control grinding machine.
The passing capacity of the grinding machine refers to the ratio of the total ore supply of the grinding machine (raw ore plus returning sand) to the effective volume of the grinding machine. It is related to the type of grinding machine, the size of the ore feeding, etc., which is about 14~ 16 tons / m 3 • hour.
Mine Main Ventilator Control System
The main air volume of mine refers to the air volume of main inlet and return air shaft. The main ventilator`s working condition is automatically adjusted by using frequency control technology, realizing intelligent adjustment and control for the main air volume and air pressure of mine. In terms of concrete implementation, to meet the air volume required for underground operation, the frequency control system in main fan power supply module is used to control the main fan frequency conversion operation, and automatically adjust the speed of the ventilator on a large scale to make it operate under the optimum condition. When need to reduce the air volume, the synchronous speed can be changed by reducing the stator supply frequency of the motor, which can realize the main fan speed decrease; Conversely, when need to increase the air volume, it can be realized by increasing the motor stator supply frequency. Using the frequency converter to drive the operation of the main ventilator not only can realize the soft start of the ventilator and the stepless smooth speed regulation but also can greatly reduce the energy consumption of the fan and save energy. Huafei company could provide complete Ventilator Control include Ventilator Control Cabinet, Medium Voltage VFD for ventilator.
Mine Main Ventilator Control System,Mine Ventilator,Ventilator Automation,Ventilator Control System
Jiaozuo Huafei Electronic & Electric Co., Ltd. , https://www.intelligentmine.com