DOI 10.21440/2307-2091-2017-2-63-66 Publication Date 11.07.2017
Efficiency increase of the excavator walking mechanism pdf
N. M. Suslov, V. A. Borovkov, P. A. Kas'yanov
The basis of excavation technology in conducting the open mining operations are powerful walking excavators. When stationary, the excavator rests on the ground with a support plate at the base, while walking, the weight of the excavator transfers to support shoes placed on both sides of the excavator; two pairs of hydraulic cylinders driven by high-pressure pumps move each shoe. Support shoes are released from the grips, the rods of the traction cylinders are pulled out to the maximum value, and then the lifting cylinders lower the supporting shoes to the ground and lift the leading edge of the base. The uneven distribution of the machine's gravity between the individual components of the excavator and the need to lift the center of gravity to a considerable height significantly complicate the design and exploitation of the walking mechanisms. The article presents and analyzes the features of walking undercarriage in comparison with other types of undercarriage: the possibility of a significant reduction of the ground loading during operation and movement of the machine, increasing the excavator reliability. The author consider features of the three-bearing and four-bearing hydraulic walking mechanisms. The article contains a description of the three-bearing excavator walking mechanism with a single-cylinder drive of the mechanism sides. The authors present the calculations and the results of the kinematic and force analysis of the walking mechanism of considered construction. In kinematic analysis, an equivalent kinematic scheme replaces the original scheme of the mechanism. The authors obtained the motion equations by the method of a closed vector contour in the projections on the coordinate axes. In force analysis, in accordance with the D'Alembert principle, the authors compiled equilibrium equations for the system of active forces, reactions and inertia forces. One can see the presented results of calculating the parameters of the walking mechanism for specific machines that confirm the efficiency of the described scheme of walking undercarriage.
Keywords: excavator; walking mechanism; ground loading; kinematic and power analysis; parameters of the walking mechanism; efficiency of walking undercarriage.
REFERENCES
1. Suslov N. M. 2013, Ekspluatatsionnye kharakteristiki sushchestvuyushchikh shagayushchikh mekhanizmov odnokovshovykh ekskavatorov [Performance characteristics of existing walking machines of single bucket excavators]. Gornoe oborudovanie i elektromekhanika [Mining equipment and electromechanics], no. 8, pp. 11–14.
2. Poderni R. Yu. 1980, Shagayushchie draglayny na otkrytykh razrabotkakh [Walking draglines on open-cast mines], Moscow, 70 p.
3. Suslov N. M., Suslov D. N. 2015, Sovershenstvovanie shagayushchego khodovogo oborudovaniya s gidroprivodom [Perfecting the walking gear with hydraulic drive]. Izv. vuzov. Gornyy zhurnal [News of the Higher Institutions. Mining Journal], no. 8, pp. 90–94.
4. Gruzdev A. V., Boyko G. Kh. 2003, Shagayushchie ekskavatory-draglayny proizvodstva korporatsii OMZ [Walking excavators-draglines produced by OMZ Corporation]. Gornaya promyshlennost' [Mining industry], no. 3, pp. 16‒20.
5. Suslov N. M. 2012, Obosnovanie parametrov trekhopornogo gidravlicheskogo mekhanizma shaganiya ekskavatora s odnotsilindrovym privodom storon mekhanizma [The justification of the parameters of the three- bearing hydraulic excavator walking mechanism with the single-cylinder drive of the mechanism sides]. Izv. UGGU [News of the Ural State Mining University], no. 27/28, pp. 93–95.
6. Al'gin V. B. 1995, Dinamika, nadezhnost' i resursnoe proektirovanie transmissiy mobil'nykh mashin [Dynamics, reliability and resource design of transmissions of mobile machines], Minsk, 256 p.
7. Suslov N. M. 2012, Sokrashchenie energozatrat na peremeshchenie ekskavatora [Reducing energy costs for moving the excavator]. Izv. vuzov. Gornyy zhurnal [News of the Higher Institutions. Mining Journal], no. 3, pp. 99–103.
8. Suslov N. M. 2015, Povyshenie ekspluatatsionnykh kachestv shagayushchikh mekhanizmov ekskavatora [Improving the performance of the walking excavator mechanisms]. Gornoe oborudovanie i elektromekhanika [Mining equipment and electromechanics], no. 8, pp. 44–46.
9. Boyko G. Kh. et al. 1986, A. s. 1239229 SSSR. Mekhanizm shaganiya [A. s. 1239229 USSR. The pacing mechanism], no. 23, 3 p.
10. Suslov N. M., Lyaptsev S. A. 2004, Kinematicheskiy i silovoy analiz mekhanizma shaganiya ekskavatora [Kinematic and power analysis of the excavator walking mechanism]. Gornye mashiny i avtomatika [Mining machines and automatics], no. 7, pp. 9–11.
11. Stepanova N. R., Suslov N. M. 2013, Kinematicheskiy analiz chetyrekhzvennogo mekhanizma shaganiya ekskavatora [Kinematic analysis of the four- bearing mechanism of the excavator walking]. Matematicheskoe modelirovanie mekhanicheskikh yavleniy: materialy Vseros. nauch.-tekhn. konf. [Mathematical modeling of mechanical phenomena: materials of the All-Russian scientific-technial conference], Ekaterinburg, pp. 88–95.
12. Suslov N. M. 2011, Kinematicheskiy analiz trekhopornogo gidravlicheskogo shagayushchego mekhanizma s odnotsilindrovym privodom storon mekhanizma [Kinematic analysis of a three-bearing hydraulic walking gear with a single-cylinder drive mechanism sides]. Izvestiya UGGU [News of the Ural State Mining University], no. 25-26, pp. 68–71.
