The application of PLC control system in shield machine

PLC control system in the application of the shield machine zhan-ke wang welcome to e hall hall 5 drill/machine/drill floor drill, DTH drilling, horizontal directional drilling, pipe jacking, the rotating drill,. 。 。 Companies use two German herrenknecht company earth pressure balance shield machine, take the city of guangzhou metro line 3 - respectively Time range around the tunnel drivage task. It is equipped with mechanical and electrical integration of hydraulic system, synchronous grouting system, foam system, bentonite filling, sealing and SLS - main bearing automatic lubrication system T tunnel, laser automatic control system is a high degree of automation in the modern tunnel excavating equipment machinery, controlled by PLC. 1 the composition of PLC controller system PLC system with industrial computer, two modems, PLC operation and storage, various sensors input parts and various types of electric relay output, as shown in figure 1. 硅镁质人- - - - - - Ager is S7 - PLC automatic control program management, installed in the control room on the ground of industrial computer ( PC) , through a volunteer for a modem and a installed in the shield machine modem dubbed mutually, and shield construction machine PLC connected to a serial port, so as to monitor and control the operation of PLC, PC also plays a driving parameter data preservation effect, convenient operation personnel use and maintenance. Figure 1 control system composed of figure software of PLC system are mainly ground control room computer operating system, SIMATIC Manager program, w2 Netpro program and monitoring program, and is installed on the shield machine PLC control program. 2 run according to set program, PLC system in some necessary conditions met, PLC for the next step of work, otherwise, the program will not be able to run down, stop running equipment, at the same time, error message will be displayed in the operation room on his computer. We according to display the error message and code to find the cause of the problem, the PLC is normal input, PLC is normal output, input/output before and after the equipment is normal, connections are in good condition. This section analysis and careful screening, failure will be resolved easily. In shield construction machine center of rotors EP2 grease filling system as an example, illustrates S7 - PLC automatic control program in the application of the shield machine troubleshooting. In the shield machine, EP2 lubrication filling system is more complex and important part of, include spiral confidential letter, in areas such as the ball bearing seal and seal center of rotors of sealing automatically. The normal operation of this system is not only related to shield machine can run smoothly, to lengthen the service life of the equipment at the same time plays a very important role. EP2 filling system is compressed air through the electromagnetic valve controlled by the PLC to provide kinetic energy source for pneumatic pump, the input pressure and the ratio of the output oil pressure is 1:50, which is 1 bar pressure can produce 50 bar of oil pressure. Usually the compressed air pressure adjustment to 1. 5 ~ 2. Zero bar, the oil pressure is 75 ~ 100 bar, enough to overcome the wastage of the grease in the pipe, guarantee to the multiple oil distributing valve of shield machine has enough pressure, again by oil distributing valve will be lubricating grease to the need of heterogeneous parts, achieve automatic lubrication effect, as shown in figure 2. Figure 2 EP2 grease lubrication system diagram distributing valve plays an important role in the lubrication system, its structure is shown in figure 3. Its working process: when the equipment is started, the PLC issue instructions for two two-way solenoid valve electricity, as shown in figure 4, has the pressure oil into the oil distributing valve, begin oil distribution; In such a case, distributing the assigned amount of grease can be through the control valve core is calculated on the number of stroke, stroke of valve core through the pulse sensor input to PLC, as shown in figure 5. When accumulated to a certain amount of stroke number, PLC issue instructions, closed to the solenoid valve electricity, the import of oil distributing valve closed, end of the oil distribution. When next instruction, according to the repetition. Figure 1-3 oil distributing valve Valve plate; 2 - Electromagnetic valve; 3 - Valve core. 4 - Pulse sensor; 5 - Valve block ( Quantitative block) Figure 4 tutu PLC control solenoid valve circuit pulse signal back to the PLC troubleshooting examples, figure 3 in the shield construction machine operation room on a computer, display center of rotors grease lubrication system failure, through the use of PLC program and display the error message and Chad is no signal at the output of the oil distributing valve. Remove the stroke sensors, a sensor inside diameter and the diameter of metal bar inserted into body, almost as a piston reciprocating motion, can see from the PLC input indicator light, the sensor can work normally, then one of the output oil tube removed, manually greasing, grease or not able to note; In machine room distributing valve as a whole will be removed after disassemble, clean, finally when clean the valve plate, a tiny sand out of the valve plate hole ( About 1 mm) in diameter Normal, once again to the shield machine installation, commissioning, turned out to be a mechanic when replacing oil barrels, careless operation, have sundry fall into oil barrels, led to the failure. Can be seen from the above, the PLC in herrenknecht shield machine got a lot of application of SIMATIC Manager can help us to find fault point, will help us more accurate and faster.
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