Wireless Sensor Cutterhead Working Status Monitoring System

YNT-200 Cutterhead Working Status Monitoring System for Shield TBM Tunnelling

During the shield TBM tunnelling, the working status of the cutterhead is difficult to be determined because the pressured chamber is located behind the cutterhead.  Our YNT-200 system is capble of  monitor the working status of the cutterhead and predict the cutter wear in real time. The system consists of The system consists of Integration Cutter Sensors units, terminal data acquisition unit, hub data acquisition unit and data processing and display unit. The cutter wear, cutter rotation speed and cutterhead temperature can be monitored and transmitted to the system software through the central port by cable and wireless, is a Smart Disc Cutter Monitoring System in tunneling. The system software can simultaneously display the TBM operating parameters and cutterhead working status parameters, Disc Cutter Wear Status Perception, predict the cutter life and present early warning of abnormal working status. The system has been successfully applied in a shield tunnelling project. Based on the analysis of the monitoring data, it was found that the normal cutter wear mainly depended on the rock abrasiveness and cutter rotation distance. The difference in cutter wear rate in the different ground was more than 3 times. The relative sliding between the cutter and the tunnel face was widespread. The sliding distance in low-abrasive formations exceeded 1/3 of the cutter track length. Under the normal tunneling conditions, the cutterhead temperature was lower than 50°. The successful application shows that this system can work stably in long term under harsh work environment and provide guidance for shield TBM tunnelling.

cutters detection system

System Composition:

1. Integration Cutter Sensors units
2. Terminal data acquisition unit
3. Hub data acquisition unit
4. Monitor Display unit

shield wireless data acquisition system

Advantages:

1. Effectively monitor the operation status of tools, reduce the cost of regular stoppage for inspection and maintenance and tool loss, and improve the efficiency of digging.
2. Automatic data recording, unattended, and intelligent alarm for tool abnormality.
3. Based on advantageous resources, it focuses on reliable measurement, acquisition, processing, communication, and storage of signals in special environments (such as high temperature, high pressure, corrosion, and shock vibration) to ensure the system adapts to the harsh shield construction environment.
4. It can be customized according to different TBM shield machine types.

Technical feature

1. Adopting mixed high and low frequency band networking (tens of KHz and hundreds of MHz) and relay technology, it adapts to short-range wireless reliable communication under flooding, earth burial, metal frame structure obscuring and other environments in earth pressure balance shield and mud water balance shield application environments of different diameters.
2. The terminal node is powered by wide temperature lithium battery (rechargeable repeatedly) with 4 months of endurance (5h sampling cycle).
3. Realize real-time acquisition and monitoring of disc cutters’ rotational speed, temperature and tool ring wear, provide tool abnormal alarm, tool monitoring parameter curve display and playback, etc.
4. Integrated design of sensor measurement and acquisition and wireless communication, easy installation.
5. Equipment structure design and installation form can be customized according to different shield machine types.
6. Automatic data recording, unattended.

Technical Datasheet