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Strain sensor for a non-instrumented anchor, in particular an expansion anchor, a strain monitoring system, use of the strain monitoring system and a method of continuous monitoring of load changes in the non-instrumented mining anchor
Strain sensor for a non-instrumented anchor, in particular an expansion anchor, a strain monitoring system, use of the strain monitoring system and a method of continuous monitoring of load changes in the non-instrumented mining anchor
The invention concerns a tensile sensor (1) for an unmanned mining cat, in particular a stray cat, intended to be fitted in a pre-attached attachment assembly of a cat previously lodged in a top hole. The sensor (1) is equipped with a tensiometer bridge (2) with four Wheastone-resistant tensiometers, combined with an analogue-digital converter (3) with differential input and differential reference voltage input, and the sensor (1) is equipped with a microcontroller (4) with non-volatile memory,memory and interface for communication with analogue-digital converter (3),and is equipped with an actual time clock, an external non-volatile memory (5) for the storage of measurement data, and is connected to an electricity source (6) at approximately constant voltage. The voltage sensor (1) is favourably equipped with a radio communication subsystem (9) with an individual hardware identifier for the identification of the voltage sensor (1) using radio communication. The result also applies to a continuous monitoring system for changes in anchor enclosure densities with numerous non-aligned top-tether anchors,comprising a number of voltage sensors defined above and a portable transmitter-receiver module containing a single-system microcontroller to control the radio block, which is adapted to radio communication with the radio communication subsystem (9) of the voltage sensor (1). The result also applies to the use of this system to generate a dynamic miner stress map and how to continuously monitor changes in the load of an unmanned anchor.
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