51CTO 2022-09-23 09:20:06 阅读数:892
At present, the stackers and reclaimers used in many metallurgical enterprises, especially thermal power plants and cement plants, are controlled by wired cables.retract.With the aging of the line and the impact of the on-site dust environment, the cable failure rate is high, and it is very easy to replace the control cable frequently, the control signal is unstable, the equipment is burned out, and the equipment cannot be controlled in time due to disconnection faults.
In view of the above problems, the wireless control technology of the stacker and reclaimer can be used to solve it.The wireless communication between the stacker and reclaimer and the control room DCS can fundamentally solve the hidden danger of production caused by the breakage of the control cable of the stacker and reclaimer.
Basic principles of the renovation plan:
In this scheme, the stacker and reclaimer in the circular coal yard is responsible for the important task of storing and transporting raw materials.The switch signal in the PLC cabinet of the electric room is wirelessly transmitted to the DCS cabinet of the No. 4 transfer electronic room, including 8 command signals such as allowing stacking, allowing reclaiming, peripheral reclaiming operation, and emergency stop of the stacker and reclaimer, as well as stacking operation, stacking, etc.There are 16 feedback signals such as material failure, reclaiming failure, and reclaiming loop, and the wireless transmission distance is 10 kilometers.So as to realize wireless control of stacking and reclaiming.
According to the site conditions, the wireless two-way switching value transmission device DTD122HEY-16/8 can be used to realize the wireless monitoring of the operation of the stacker and reclaimer in the No. 2 coal yard by the DCS system of the transfer station.Install a DTD122HEY-16/8 in the PLC cabinet of the power distribution room of the No. 2 circular coal yard and the power distribution room of the No. 4 transfer electronic room, respectively.This move does not need to dig trenches for wiring, avoiding the large amount of engineering and frequent damage of the wired method.
Schematic diagram of wireless communication scheme ▼
Multi-channel two-way wireless switch transmission device DTD122HY can completely replace the control cable of the stacker and reclaimer to realize wireless control, so as to solve the serious impact on production caused by the breakage of the control cable of the stacker and reclaimerThe device can directly replace the cable to carry out point-to-point, point-to-multipoint, multipoint-to-point switch signal one-way and two-way transmission.The transmitting end of the device provides 4-99 channels of digital signal input, and the receiving end provides 4-99 channels of digital signal output, which can perfectly realize the connection between the local control station of the large mobile machines such as stackers and reclaimers and unloaders and the PLC.Wireless communication, wireless interlocking function among push cars, coke blocking cars and coke quenching cars, wireless control of dust removal system of coke pushing cars, etc.
The communication frequency band used is 430-433MHz, which has strong anti-interference ability and long communication distance.This frequency band is a public frequency band in China and can be used free of charge without a license. It is not restricted by radio management regulations and avoids mutual interference with other wireless devices.In signal transmission, each signal is encrypted to minimize external interference.