________________ By localizing damaged or blocked disc cutters, the Herrenknecht DCRM system optimizes the maintenance intervals on the cutterhead. Frequent standstills due to manual inspections of the disc cutters are reduced to a minimum - which makes tunnelling more efficient and avoids secondary damage to the adjacent disc cutters or to the steel construction of the cutterhead.
Targeted control of cutter disc maintenance
Detecting wear on cutting knives and buckets is already a well-established practice on tunnel boring machines at Herrenknecht AG. Expanding our wear management to disc cutters as a next step makes sense technologically.
The DCRM system monitors the rotation and temperature of the disc cutters continuously during tunnelling. It is an independent monitoring system and can be used both in new Hard Rock TBMs and in those already at work, without any additional installations on the cutterhead.
Space requirements are low and the assembly and maintenance of components are easy. The evaluation of the measured data can be individually adjust by the machine driver.
Pulse generators are integrated into the cutter disc hub. As soon as the cutter disc
rotates, several signals per rotation are generated in the sensor system 5
thus recording the rotations. At the same time, the sensor system
measures the temperature directly next to the disc cutter.
Wireless data transmission:
The DCRM units 6 with sensor system, antenna and self-sufficient energy supply
are fixed in the cutterhead directly next to the disc cutters. The data
collected are transmitted wirelessly by antenna 7 in the DCRM unit
to the receiver unit 10.
The receiver unit 10 transmits the measured data per cable to the control cabin 11.
Evaluation and display:
The industrial PC 12 evaluates the measurement data using software
developed by Herrenknecht. The state of the disc cutters is displayed for each track individually. Critical deviations can be seen and are automatically displayed
as warning and alarm messages.
- targeted control of disc cutter maintenance
- machine standstill times for maintenance inspections are reduced
- online rotation monitoring for every single cutter disc
- area of application: hard rock (open mode)
- cutter size: 17 inch or 19 inch
- flexible autonomous monitoring system (retrofittable and reusable)
- measurement and data evaluation continuously during tunnelling
- data display in the control cabin
- simple assembly and maintenance