Coal mine drainage monitoring system based on PLC scheme kj164

 
Coal mine drainage monitoring system based on PLC scheme kj164
1、 Overview
  Mine drainage system undertakes the important task of discharging underground water gushing and is the key link of mine safety production
Whether various equipment of drainage system can operate safely, reliably and effectively is related to the production and safety of the whole mine
Drainage equipment generally has high power and high power consumption
The traditional drainage can only manually control the start and stop of the pump
It is impossible to use the drainage equipment and warehouse capacity to scientifically and reasonably adjust the drainage volume and drainage time
Therefore, the traditional mine drainage mode generally has the disadvantages of high energy consumption, low efficiency and high production cost

Based on the above reasons, the automatic control of mine drainage and ground remote monitoring can be realized, and the water pump can be started and stopped according to the water level of the sump, so as to improve the effective utilization rate of the water pump and greatly reduce the production cost; It can reduce the number of caregivers, reduce the wage investment accordingly, enrich the equipment maintenance and repair team, improve the maintenance quality, reduce the occurrence of accidents, change the passive maintenance after accidents into active regular maintenance, and improve the utilization rate of equipment; It can ensure safe production, improve the working environment and improve labor productivity; It can effectively protect water pump, motor and other equipment, prolong service life, reduce accident shutdown time and improve drainage capacity; By adjusting the start-up and stop time to avoid the peak of power load, effectively cut the peak and fill the valley, and save electricity expenses

1
1 system parameters
There are three pumps in the central water pump room, each pump has three gate valves, and each pump has a set of jet vacuum pumping system

2、 System construction objectives
1
Save the repeated investment cost and maintenance cost of transmission channel (optical fiber, communication equipment, etc
);
Save repeated investment costs such as database, configuration software and software development;
Build transmission platform, data platform and monitoring platform, one-time investment and long-term benefit;
2
Centralized monitoring and monitoring on the ground to reduce the number of underground personnel and reduce the possibility of underground casualties;
Improve the working environment, improve the safety factor and ensure the personal safety of employees;
Data sharing and alarm linkage to reduce losses caused by mine disasters;
3
Realize unattended and regular inspection, and effectively reduce personnel costs; Realize the automatic control of equipment and reduce the labor intensity of workers; Reduce post employment and improve staff efficiency;
4
Reduce manual operation errors and prolong the service life of the equipment;
Improve the fault analysis and judgment ability of equipment and reduce shutdown accidents;
Strengthen the dispatching and management of transportation and improve the transportation capacity;
5
Provide a high-speed, safe and reliable management platform for mine automation system;
Improve the overall integration level and give full play to the comprehensive management benefits of the automation system;
Realize the integration of coal mine management and control and improve the safety production management and dispatching level of coal mine

3、 Coal mine drainage monitoring system based on PLC scheme kj164 user demand analysis
Underground water pump is one of the main equipment in coal mine production
Realizing the remote control and monitoring of underground pump house is an important part of comprehensive automation construction
At present, in the drainage system design of the mine pump house, multiple multi-stage centrifugal pumps are generally set, one for working and one for standby, and the water pump for rotation maintenance is set
These pumps have high voltage, high power and complex operating conditions, so it is difficult to achieve real-time monitoring manually
In addition, manual operation is widely used for water filling (jet) of suction pipeline before pump startup, water level monitoring of water bunker, operation and management of equipment in pump house, etc
The traditional mode operation process is cumbersome, labor-intensive, many human factors, long pump start-up time and low degree of automation, which can not meet the requirements of modern mine management
Therefore, it is necessary to realize the automatic control of pump house water pump
The original water pump needs to be transformed and corresponding equipment needs to be added to realize unattended
The following modifications are made to the on-site equipment:
1
Add positive pressure sensor package, negative pressure sensor package and liquid level package

2
Add electric ball valve and change the original manual gate valve on the water pump into electric gate valve

3
Mine flameproof and intrinsically safe PLC controller is added to control the start and stop of ball valve, gate valve and water pump on site, and collect sensor signals on site

4
The console is added for on-site monitoring and real-time data monitoring

5
Add electric parameter acquisition module for field data acquisition

6
Add three sets of 1-control 3 gate valve control boxes

8
A set of industrial computer is added in the centralized control room to realize the remote control of water pump and on-site data acquisition and recording

2
2 system functions and features
1
Real time online monitoring of the water level of the water sump, when the water level reaches the upper limit, it can alarm and automatically start the water pump; When the water level reaches the lower limit, an audible and visual signal will be sent to automatically stop the pump;
2
Real time on-line monitoring of various working conditions parameters of the water pump, including water level, voltage, current, pressure, vacuum degree, opening state of gate valve, etc;
3
When the water pump fails, it can give an alarm in time

4
It has remote and local start and stop functions;
5
The on-site operation of the water pump house is combined with the on-site operation with the computer graphical interface to simplify the operation and status display to the greatest extent;
6
The centralized controller adopts S7 Series PLC of Siemens and advanced process control software to realize the optimal control strategy of underground drainage monitoring system;
7
The alarm, information display and report statistical processing of underground drainage monitoring system can be fully integrated into the data system of the whole mine monitoring system;
8
Have perfect system protection function;
9
The control system can be connected to the mine industrial Ethernet trunk network through Ethernet to realize the information sharing between the water pump monitoring subsystem and the automatic monitoring system of the whole mine;
10
It has strong compatibility and expansibility, and completes the expansion interface for the integrated automation centralized control in the next step;
11
It has the function of real-time on-site condition monitoring, can save the on-site operation status data, and can view the operation status of equipment in each time period at any time
4、 Design principle and basis of coal mine drainage monitoring system based on PLC scheme kj164
1 design basis
(1) The design scheme is made according to the actual requirements of safety production drainage monitoring system

(2) The system equipment meets the environmental conditions of mine production and the relevant requirements of coal mine safety regulations

2 design principles
(1) Safety and reliability
1) It has two control modes: remote control and local control
When the communication between the centralized control cabinet and the remote monitoring platform is interrupted, it will switch to the local control mode
The local control mode can be divided into local centralized control and local manual control

2) Comprehensively monitor the motor, water pump, starting cabinet, vacuum system and other links, and give early warning of abnormalities in the system in advance

3) The water pump shall be started and stopped automatically in strict accordance with the specified procedures

4) Reliable original control devices are selected, the control core is S7 Series PLC of German Siemens, and the relay components are domestic famous brand devices

(2) advanced nature
1) Due to the use of optical fiber ring network communication transmission technology, the data transmission is faster and more reliable

2) The use of configuration software control programming technology not only greatly improves the reliability, but also makes the program more universal, but also makes the secondary development and capacity expansion of the system more standardized and easy

3) The system follows the standard subsystem interface specification of mine integrated monitoring system, so that the system can be easily incorporated into the mine integrated monitoring system and share data with other subsystems

The control system is composed of ground operator station and water pump control substation

The control system implements automatic control and automatic detection of operation parameters for drainage pump, jet system, pipeline electric valve and other devices in the pump room
The water pump is controlled by detecting parameters such as water level of water tank, motor current, motor voltage, opening state of gate valve, vacuum degree and so on

The control system panel is equipped with a liquid crystal touch screen, which can directly, vividly and real-time reflect the working state of the system and parameters such as water level of the water tank, working current of the motor and vacuum degree of the water pump in the form of graphics, images, data and words

The communication manager transmits various data information to the ground production dispatching center and production equipment control center, and the ground operator station carries out real-time monitoring, alarm display, fault history query, analog curve display and report printing
The system has the characteristics of reliable operation, convenient operation and high degree of automation

5、 Overall design system
The coal mine drainage system undertakes the important task of discharging all underground water gushing, and is the key link to ensure the safe production of the mine
The reliable operation of its various equipment is related to the safety of the whole mine, whether it can achieve economic and reasonable operation, and the economic benefits of the mine
Therefore, modern automatic control technology is applied to realize the automatic control of coal mine drainage system and ensure the safety, reliability, economy and rationality of coal mine

The control system takes PLC as the control core and touch screen as the display and main operation equipment
The signals of water pump equipment and sensors are detected by PLC to control the opening and closing of water pump equipment and electric valves, electric ball valves and other actuators
The PLC simulation module collects the field pressure, voltage, current and other signals through the sensor and displays them on the upper computer
The system mainly includes four parts: control cabinet, console, sensor and actuator