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1、精选优质文档-倾情为你奉上System structure and control scheme system design features The control system of ventilation units with centrifugal activation of interlocking and over-temperature protection. And conventional relays compared to the implementation of the ventilation system, PLC system has a low failure
2、rate, high reliability and wiring is simple, easy maintenance and many other advantages, PLC control functions so that thventilation systems greatly enhance the degree of automation, reducing the labor jobs intensity. PLC and frequency converter with the use of air pressure transmitter, allowing the
3、 system to control the security, reliability, greatly improved, but also run the fan significantly reduce the failure rate, not only saves energy but also improve the operation rate of equipment. Mine ventilation system to meet the requirements of automatic control system the specific design require
4、ments are as follows: (1) This system provides manual / automatic mode of the two, with a state of alarm display and features such as faults. (2) Analog PID operator via pressure input, output analog converter control. (3) In the automatic mode, when the downhole pressure below the set pressure limi
5、t, two sets of fans will be running to work at the same time, at the same time and issued instructions and alarm signals. (4) Analog input gas, when the gas concentration is greater than the upper limit of alarm settings, and report to the police to give directions. When the gas concentration is gre
6、ater than the upper limit of power settings, PLC will cut off the face and wind power generating units to prevent the gas explosion. (5) The use of temperature sensors measured temperature or the wind bearing unit stator temperature, bearing temperature or when the stator temperature exceeds the set
7、 alarm on the line, give directions and warning signals. When the stator temperature or the wind bearing temperature exceeds the set temperature of the line unit conversion, PLC will cut off the instructions and alarm signal and automatically cut off the air unit is currently running in automatic mo
8、de and can automatically access another run Typhoon unit, if in the hand dynamic manner, staff manually switch 1. (6) In order to prevent fatigue centrifugal fan operation in any state, set the fan to run in a total time will automatically switch to another unit operation typhoon. system architectur
9、e and program Ventilation control system is mainly composed of 2 sets of centrifugal fans, centrifugal fans each have two motors, each motor drives a set of fan films, two films on the rotating fan and a set of wind suction, a group to increase wind speed, for the wind to carry out underground. Unde
10、rground air volume in accordance with the different, using different types of fans. The design of 2 45 kW fan as an example, the selection of a S72200 PLC, the air pressure sensor and transducer, such as the formation of a complete closed-loop control system. Including contactors, intermediate relay
11、s, thermal relays, Mine Explosion-proof magnetic starter, circuit breaker protection of electrical systems, electrical and PLC to achieve effective protection, as well as motor control switch.PLC control system with the fan motor to start and run, monitor, interlock and over-temperature protection.
12、PLC and with the use of air pressure transmitter, allowing the system tocontrol the security, reliability, greatly improved, but also run the fan significantly reduce the failure rate and improve the operation rate of equipment 2. For coal mine ventilation system to meet the requirements of automati
13、c control, design of control programs is as follows: The system provides manual / automatic mode of the two, with scene control, status display and alarm failure. In manual mode, the fan control through the switch from the effects of air pressure inside the mine. In order to prevent fatigue fan runn
14、ing, in any state in the cumulative fan run time set to switch to another machine running the typhoon. A Group B Group centrifugal fan centrifugal fan with two switches can be converted. Time cycles and timing can be randomly set. Are sound and light alarm signal form. Voice Alarm (electric flute) b
15、utton can be used to lift, alarm troubleshooting instructions automatically disappear. In automatic mode, the use of air pressure FarEasTone mine detection sensors within the pressure signal, the signal transmitter will transform the site into a unified standard signal (eg, 4 20 mA DC current signal
16、, 0 5 V DC voltage signal, etc.) , into the A / D converter analog-digital conversion module, and then into the PLC, PLC to detect the pressure value with set values of pressure and deal with the work of the output signal to control fan. When the air pressure inside the mine in an atmospheric pressu
17、re or in the setting of a value above atmospheric pressure, the work of centrifugal fan centrifugal fan with back-up cycle of the work; when a sudden accident, the mines air pressure is lower than a set of atmospheric pressure value, the work of centrifugal fan centrifugal fan with back-up cycle is
18、no longer work, and automatically switch to the work at the same time, increase the volume of the mine ventilation, mine until the pressure rose to values set above atmospheric pressure, the work of ventilation centrifugal fan with back-up machine to resume the cycle of work 3. Gas in the mine for w
19、ind systems, coal mine gas concentration in the gas concentration detection sensor with a transmitter signal will be the site transform into a unified standard signal, into the A / D converter analog-digital conversion module, and then into the PLC , the same will be detected by the PLC and set nume
20、rical values for comparison, when the gas concentration greater than the value after the set, PLC output signals to control fan to stop working, and the output signal power was automatically cut mine to meet the requirements of wind power interlock to avoid electronic sparks lit the gas to prevent g
21、as explosion accident.系统的设计功能本控制系统具有离心通风机组的启动、互锁和过热保护等功能。与常规继电器实施的通风系统相比，PLC系统具有故障率低、可靠性高、接线简单、维护方便等诸多优点，PLC的控制功能使通风系统的自动化程度大大提高，减轻了岗位人员的劳动强度。PLC和变频器与空气压力变送器配合使用，使系统控制的安全性、可靠性大大提高，也使通风机运行的故障率大大降低，不仅节约了电能，而且还提高了设备的运转率。为满足矿井通风系统自动控制的要求，系统的具体设计要求如下：（1）本系统提供手动自动两种工作模式，具有状态显示以及故障报警等功能。（2）模拟量压力输入经PID运算，输出
22、模拟量控制变频器。（3）在自动方式下，当井下压力低于设定压力下限时，两组风机将同时投入工作运行，同时并发出指示和报警信号。（4）模拟量瓦斯输入，当矿井瓦斯浓度大于设定报警上限时，发出指示和报警。当瓦斯浓度大于设定断电上限时，PLC将切断工作面和风机组电源，防止瓦斯爆炸。（5）运用温度传感器测定风机组定子温度或轴承温度，当定子温度或轴承温度超过设定报警上线时，发出指示和报警信号。当定子温度或轴承温度超过设定风机组转换温度界线时，PLC将切断指示和报警信号并自动切断当前运行风机组，在自动方式下并能自动接入另一台风机组运行，若在手动方式下，工作人员手动切换1。（6）为防止离心风机的疲劳运行，在任何状
23、态下，风机在累计运行设定时间后都会自动切换至另一台风机组运行。结构和方案通风控制系统主要由 2 台离心风机组成，每台离心风机有两台电机，每台电机驱动一组扇片，两组扇片是对旋的，一组用于吸风，一组为增加风速，对井下进行供风。根据井下用风量的不同，采用不同型号的风机。本设计以风机 2 45 kW 为例，选用一台S72200 PLC、空气压力传感器和变频器等组成一个完整的闭环控制系统。其中还包括接触器、中间继电器、热继电器、矿用防爆型磁力启动器、断路器等系统保护电器，实现对电机和 PLC的有效保护，以及对电机的切换控制。本PLC控制系统具有对通风机的电动机启动与运行，进行监控、联锁和过热保护等功能。
24、PLC与空气压力变送器配合使用，使系统控制的安全性、可靠性大大提高，也使通风机运行的故障率大大降低，提高了设备的运转率2。为满足煤矿矿井通风系统自动控制的要求，设计如下的控制方案：本系统提供手动 /自动两种工作模式，具有现场控制方式、状态显示以及故障报警等功能。在手动方式下，通风机通过开关进行控制，不受矿井内气压的影响。为防止通风机疲劳运行，在任何状态下风机在累计运行设定时间后要切换至另一台风机运行。A组离心通风机与B组离心通风机可由二位开关转换。循环次数及定时时间可根据需要随机设定。报警信号均为声光形式。声报警 (电笛 )可用按钮解除 ,报警指示在故障排除后自动消失。在自动方式下，利用远传空
25、气压力传感器检测矿井内的气压信号，用变送器将现场信号变换成统一的标准信号 (如 420 mA 直流电流信号、0 5 V直流电压信号等 )，送入 A /D 转换模块进行模数转换，然后送入 PLC，PLC将检测到的气压值与设定的气压值进行比较和处理，输出信号控制通风机工作。当矿井内的气压在一个大气压或在设定的某个大气压力数值以上，工作离心通风机与备用离心通风机循环工作;当出现突发事故，矿井内的气压低于设定的某个大气压力数值，工作离心通风机与备用离心通风机不再循环工作，并自动切换为同时工作，加大对矿井内的通风量，直至矿井内的气压升至设定的大气压力数值以上，工作通风机与备用离心通风机恢复循环工作3。在有瓦斯的矿井供风系统中，矿井内的瓦斯浓度传感器检测瓦斯浓度，用变送器将现场信号变换成统一的标准信号，送入 A /D 转换模块进行模数转换，然后送入 PLC，同样 PLC将检测到的数值与设定的数值进行比较，当瓦斯浓度大于设定数值后，PLC输出信号控制通风机停止工作，并输出信号自动切断井下的电源，满足风电联锁要求，以免电子火花点着瓦斯，防止瓦斯爆炸事故发生。专心-专注-专业