Shallow of 5000 t/a cement grinding production line lubricating oil station electrical control system optimization

5000 t/a cement grinding production line lubricating oil station is analysed 2021 - electrical control system optimization 01 - 30 Tan Shuanglian CRC ( Huizhou) Co. , LTD. 5000 t/D cement grinding production line is generally composed of roller press, type of classifier, & Phi; 4. 2 m× 13 m main equipment such as mill grinding system, and the host device is inseparable from the lubricating oil system, each device of the lubrication system of the whole cement production system can run normally and equipment protection plays a key role, the station electrical control in the lubrication system plays a decisive role. In production, mill system caused by the failures of the lubricating oil system often jump stop, and even cause serious equipment accident, once the equipment accident occurs, to restore to repair equipment requires a lot of manpower and material resources and money and long time limit for a project, the serious influence cement production line operation and economic benefits. Through optimization, the oil control system can effectively reduce the tube mill system outage rate and reduce the probability of accident, major equipment guarantee the safe operation of the equipment, the production normal, reduce the economic loss and reduce the labor intensity of maintenance personnel. One optimization before lubricating oil station control system overview of lubricating oil station electrical control system is composed of independent PLC control system, the input switch signals and temperature, oil level, flow, oil pressure, differential pressure signal, the output switch signals and main control high pressure, low pressure pump and oil pump system normal signal, etc. Input signal switch quantity: temperature signal including temperature and fuel supply in and out of the tank temperature meet the set value, fuel tank oil level signal, flow switch signal, the outlet pressure signal, the signal filter differential pressure switch. Switch output signals: high-pressure pump stop, start condition is in the open mill before and after stopping mill run and provide greater than 6 mpa pressure for the use of top grinding; Low pressure pump stop, start conditions is to open a case, to run for a long time, with 0. 2 - 0. 4 mpa lubricating oil for lubrication slipper. Oil system of the normal signal, the signal for the system integrated signal, the need to meet the requirements, the input signal and no oil temperature, flow, pressure, differential pressure alarm signal output, after dealing with the PLC logic operation, normal signal output oil system, allow remote start host equipment system. Hidden danger existing in the 2 2 before optimization control system. 1 before optimization control system without considering the field station PLC and DCS system in power failure or crash when safe hidden trouble of equipment, the equipment can not protect, existing equipment accidents caused by protection failure of major equipment. 2015 one day our cement mill hydraulic control system for PLC fault anomalies, cement grinding system of low pressure oil station and slow oil station stop, tube mill main motor not jump stop interlock. Analyzing the impact mill downtime is as follows: low pressure pump running and pressure not less than 0. 2 mpa, if less than this value, the standby pump will start automatically if pressure is still below zero. 2 mpa, delay after 10 seconds a mill downtime command; Such as single pump operation, low oil flow automatically start the standby pump, flow switch is still low flow rate, delay time for 10 seconds after a mill downtime command; Fuel tank oil level low latency for 2 seconds to send mill downtime command; Two low pressure pump is not running at the same time, after receipt of the mill running signal send mill stop command. Because of the low voltage equipment start-stop are high and low level signal, high pressure equipment for the pulse triggering signal. After the cement mill PLC failure, CPU output blockade, no mill run signal output to the gas station controller, receive halt command station, pump stop running, stop command station at this time is not the host, KA6 relay action, effectively control station signal loss caused, station stop running low pressure oil pump, grinding machine still can't normal received the stop signal from the PLC and downtime, finally caused by oil mill slipper tile serious lack of high temperature lead to the mill burn out. 2. 2 before optimization control system is given in the normal operation of production equipment, want to switch to another kind of control mode, the low switch instantaneous flow protection action, causing unnecessary host equipment downtime. 3 control system optimization method to modify the hydraulic control program: when two low pressure oil pump down, stay down signal, namely the KA6 keep output signal, consider when during grinding, with a low pressure pump overload switch to the standby pump running process, the presence of delay misoperation contactor switch action, therefore increase the timer T40 and set delay after 2 seconds, can prevent the spare pump switch process, host controller output signal. Hard interlock modification. Original owners break-brake hard interlock signals from gas station, host outage chain A6 (K In grinding head slipper station as an example) Normally open contacts of 185 and 186. Modified method: the low pressure pump KM1 and KM2 every increase a pair of auxiliary normally closed contact, the auxiliary contacts in series, control time relay, adjust the time to 2 seconds, the time relay normally open contacts of 193 and 194, when two low pressure pump all stop, regardless of whether the host is running and grinding K A7 relay action, the normally open contacts closed 195 and 196, closing relay 4 K movement, the park hosts. Additional electrical principle figure 4, the conclusion through the lubricating oil after the modification of the electric control system optimization, greatly improved the problems existing in the system, to ensure that the host devices in PLC without power or crash when fault phenomenon can still protect normal downtime, avoid of important equipment accident, reduce the equipment abnormal shut-down times, guarantees the system safe and continuous and effective operation. Source: the digital user. 2018