PSI - Issue 13

Filip Miletić et al. / Procedia Structural Integrity 13 (2018) 1644 – 1650 Author name / Structural Integrity Procedia 00 (2018) 000–000

1648

5

Comparative view of the maximum energy consumption of the digging drive for weared and new cutting elements

0,18 0,2 0,22 0,24 0,26 0,28 0,3 0,32

Emax weared cutting elements Emax new cutting elements

[kWh/m3]

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Number of measurement

Figure 3. Results of measuring the maximum resistance to digging

5. Conclusion The optimum geometry of the cutting elements of the rotor excavator has a major impact on the driving groups and the steel structure. The paper presents experimental investigations on the simultaneous measurement of specific energy consumption and specific resistance of materials to digging. Comparison and dependence was made on how the wear resistance of the cutting elements influenced the excavator digging drive. In the case of worn cut elements, the average value of the electricity is 124 A, while in the case of new cutting elements this value is drastically lower and is 113 A, which represents a decrease of around 9%. Also, the impact of weared cutting elements is reflected on the specific resistance of the material to the digg. There is a noticeable jump in digging resistance in the case of weared cutting elements by 10%, in comparison to the new cutting elements when excavator left the overhaul. The results of this research can be used to correctly and accurately introduce the force when defining the state and behavior of both drive groups and the steel construction of the rotor excavator. Figure 5 shows the cutting elements from the first, and then from the second measurement, when the excavator came out of the overhaul.

Figure 4. Cutting elements at the first and second measurements on the excavator SRs – 2000.32/5