AUTOMATIC DIRECTION CONTROL OF SHIELD MACHINE

摘要

PURPOSE:To increase control accuracy, by averaging in turn the latest data within one ring width of an excavating distance to calculate the transferred average and using the final corrected angle for a first corrected angle of the next ring. CONSTITUTION:An actually directed varied-angle 22 which is obtained by the input of an actual moment 19 into a using moment-angle conversion- characteristic 12 from a jack operation pattern 15 is compared with an actual varied angle 18 through a comparison element 23 and the compared value 24 is calculated to input in the averaged element 25 and the judge element 26. Next, the compared value 24 is taken in every unit forwarding distance in the interval within one ring by means of the averaged element 25 and a specified plurality of compared value 24 are averaged in turn as an averaged transfer distance 27 to input into a hold element 29 via a switch 28. Next, the latest compared value 24 of the averaged element 25 is judged against the averaged transfer distance 27 by means of the judge element 26, as to whether those are larger than a preset allowable value or not, to open or close the switch.