System Introduction

At present, manual control is commonly used to start and stop water pumps in coal mines, and it is not yet possible to automatically start and stop water pumps based on water level or other parameters. In order to reduce the operating costs of mine pump stations and improve the automation level of mine pump stations, we have designed a coal mine drainage monitoring system based on the operating process characteristics of mine pump stations. The system is controlled by a mining explosion-proof and intrinsic safety PLC control box as the core, which can automatically monitor the water level, pump parameters, and other parameters of the water tank. Through graphics, images, curves, data, text and other methods, the system's working status, as well as the water level, vibration, motor working current, motor temperature, bearing temperature, drainage pipe flow, pump status and other parameters of the water tank can be intuitively, vividly, and accurately reflected in real time.

Based on factors such as the water level in the reservoir and the electricity consumption information of the mine, a mathematical model is established to control the water pumps to work alternately and start the backup water pumps in a timely manner, and to reasonably schedule the operation of multiple water pumps. This can achieve the goals of peak shaving, valley filling, and energy conservation. The system can transmit data through optical cables or industrial Ethernet, enabling unmanned operation of multiple pumping stations and group control. This greatly reduces the labor cost of mine pumping station operation, allowing more limited operating costs to be spent on equipment renovation, maintenance, and upkeep of pumping stations. It effectively improves the equipment integrity and availability guarantee rate of pumping stations, ensures reliable operation of water pump control systems, reduces mine safety hazards, and enhances the safety factor of mine production. By setting up a running program to operate and monitor the entire pump station, semi unmanned or unmanned operation can be achieved.

System Architecture

The system mainly consists of an industrial computer, upper computer configuration software, mining explosion-proof and intrinsic safety PLC control box, mining intrinsic safety operation console, sensors, etc. All data is transmitted through optical cables or industrial Ethernet.

System Function

The system has the functions of collecting, displaying, and alarming analog quantities such as water level, flow rate, pressure (including pipeline pressure, vacuum pump negative pressure, etc.), equipment temperature (water pump bearing temperature, determined by machine winding and bearing temperature, etc.), current, voltage, and power.
The system has the functions of collecting, displaying, and alarming switch values such as water pump, valve, vacuum pump, and waterproof door status.
The system has the functions of cumulative measurement collection, display, and alarm for drainage volume, active power consumption, and pump operation time.
The system has the functions of collecting, displaying, diagnosing faults, and alarming vibrations of water pumps, motor bearings, etc.
The system has protection functions such as overcurrent (short circuit, overload, etc.), overvoltage, undervoltage, phase failure, grounding, leakage, and misoperation. The system has a remote control function on the ground, which enables on-site manual control of the start/stop of water pumps and other equipment.
The system has automatic control function, which automatically starts/stops the water pump according to water level, electricity peak and valley, etc.
The system has the function of starting and stopping multiple water pumps in the set order, and can select the number, time, and priority operation of high-performance water pumps to achieve automatic rotation of water pump operation.
The system has a manual on-site control function, which enables on-site manual control of the start/stop of water systems.
The system has functions such as remote control, automatic control, local control, and maintenance, and can set priorities. Other control states can be locked during maintenance.
The system has alarm and parameter alarm limit setting functions (sensor disconnection alarm, communication status alarm, valve fault alarm, operating parameter alarm). When a malfunction occurs, it can provide sound and light alarms, and the alarm records can be queried.
The system has the function of recording and querying monitoring parameter curves.
The system is equipped with a video image monitoring device that can monitor the working status of on-site equipment in real time.
The system has the function of storing on-site operational information into a database for easy access to historical data queries at any time.
The system has the function of generating daily, monthly, and annual reports with control parameters, and the reports can be printed. It also has event printing function.
The system has a hierarchical user management function.
The system has an industrial Ethernet communication interface, which facilitates access to the comprehensive information control platform for media and mining.

System Features

The system has multiple working modes; selection/automatic/on-site/maintenance mode, which can achieve unmanned control of equipment.
The system determines the start and stop time of water pumps based on the power grid load and peak valley power supply time period, using the principle of "avoiding peak and filling valley", to improve the quality of power grid operation in the mine.
Automatically detect water level signals, calculate the rate of rise of water levels in different water levels per unit time, determine the inflow of water in the mine, automatically activate and deactivate the number of water pumps, and schedule the operation of water pumps reasonably.
It has strong fault self diagnosis function, reliable operation, and can emit sound and light alarms and provide detailed alarm messages in case of faults. It has strong scalability and can trace the need to introduce new monitoring subsystems at any time.
Provide Ethernet interface, PROFIBUS, RS485 interface, easy to connect with other intelligent systems.