Experience of calculation development and implementation strain gauge sensor

Abstract

In the mining industry, it is often necessary to directly measure forces with significant restrictions on the sensors, so the use of the range of existing sensors is not possible. In addition, the force and load sensor, which is designed for operation in severe mountain conditions, must be: with an extended range of operating temperatures, degree of protection IP67, moisture resistant in an aggressive environment and structurally designed so as not to violate safety requirements in mine workings. Studies have identified the functional limitations of the force sensor for mining - maximum deformation, overall dimensions and maximum stresses. The decisive factors in choosing a sensor design were precise fixation, reliability, adaptability to mining technological processes with safety and compliance with operating conditions, and reasonable cost. According to the requirements of industry standards of Ukraine, the geometric dimensions of the sensor were chosen in order to find the optimal solution. Based on this information, using a multi-parameter approach, many Pareto valid solutions are obtained. Based on many Paretooptimal solutions, a sensor variant was chosen for which, after applying the above approach, it was possible to reduce non-linearity and reduce the area between the forward and backward curves, as well as to get close to the found strain value in the sticker area. On the basis of an experimental batch of manufactured sensors, their refinement was performed in real mining. The developed sensor type 4201 DST-10 meets the safety requirements of the safety control system in mining and provides higher metrological accuracy than similar sensors developed by other authors. In 4201 DST-10, multicriteria optimization methods were used in designing the elastic elements of the force sensor for a load of 10 tons. The possibility of its use in similar harsh operating conditions at other facilities is allowed.