Entwicklung und Erprobung eines thermographischen Ansatzes zur Kunstharzerkennung bei der Installation von Gebirgsankern
Rock bolting is an important method for rock reinforcement in underground mining. However, it is a demanding and time-consuming task. Driven by the desire to fully automate the process and to increase its efficiency, the installation methods are constantly being developed further. An important aspec...
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| Other Authors: | , |
| Format: | Doctoral or Postdoctoral Thesis |
| Language: | German |
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Verlag R. Zillekens
2024
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| Online Access: | https://publications.rwth-aachen.de/record/987923 https://publications.rwth-aachen.de/search?p=id:%22RWTH-2024-05932%22 |
| Summary: | Rock bolting is an important method for rock reinforcement in underground mining. However, it is a demanding and time-consuming task. Driven by the desire to fully automate the process and to increase its efficiency, the installation methods are constantly being developed further. An important aspect is the use of pumpable resin as a bonding agent for bolt installation. For the automatic resin injection, the application of a previously defined, fixed quantity of resin is state of the art. Locally varying rock conditions are not taken into account. Consequently, manual intervention is still required if resin escapes from the borehole during the injection process. To ensure that the automatic resin injection is tailored to the needs, a sensor-based detection of resin escape during the injection process is necessary. During the exothermic curing process, the temperature of the resin increases above the ambient temperature. Thereby, energy is released in the form of heat. Infrared thermography combines the advantages of vision systems and those of temperature measurement devices and is therefore a sensor technology of special interest for this task. In this thesis the development and testing of a sensor-based approach for resin detection based on infrared thermography are described. The specified requirement criteria are accuracy, speed, integrability, and flexibility. The feasibility of integrating the infrared camera system was proved by a test measurement in the underground iron ore mine Kiruna, owned by the Swedish mine operator LKAB. The acquired data formed the basis for the development of the thermographic approach. By means of a validation measurement in two other drifts of the same mine, the developed algorithm was then successfully tested. In case of a resin escape in the camera’s field of view, the maximum grayscale value rises due to the increased temperature of the resin. However, the monitoring of the maximum grayscale value alone is not sufficient to realize a reliable resin detection. Varying ambient ... |
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