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. Hufei company provide complete Mine Main Ventilator Control System include control cabinet, Medium Voltage VFD and other electric control system for coal mine machine. Mine Main Ventilator Control System,Mine Ventilator,Ventilator Automation,Ventilator Control System Jiaozuo Huafei Electronic & Electric Co., Ltd. , https://www.intelligentmine.com
2. The safe construction fee for the tunnel engineering and the underground track laying project is divided into two levels: high biogas mine and low biogas mine. The corresponding rate is applied according to the mine biogas level specified in the design.
(2) Calculation requirements for special drilling works, ground civil works and installation engineering
1. The calculation of enterprise management fees and profits for special drilling works, artificial earthwork and installation works are calculated at the labor rate.
2. The safe construction fee for special well drilling engineering, open pit stripping project, ground civil engineering and installation engineering is calculated, which is related to mine gas grade level, and does not consider the difference between high biogas mine and low biogas mine.
Several provisions for the calculation of mining engineering costs
(1) Calculation of the cost of the well engineering and underground track laying project 1. According to the characteristics of mine construction, the temporary facilities fee for the well engineering and the underground track laying project is divided into the wellbore period (phase I), the roadway period (second and third periods) and the tail. The construction period varies according to the regional category. The division principle is the same as the quota for the auxiliary engineering fee.