541 13 th International Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology” TMT 2009, Hammamet, Tunisia, 16-21 October 2009 LOADING EXTERNAL DIGGING RESISTANCE CAUSED BY THE EXCAVATIONS WITH ROTORS Beqir Hamidi, Musli Bajraktari, Ilir Doçi University of Pristina, Faculty of Mechanical Engineering ABSTRACT In this paper is the appointment of external loads caused by the resistance scrabble, which will enable the establishment of mathematical model of excavations with rotors, which are incorporated constructive and relevant parameters. Appointment of external loads enables solid solutions to design, reliability to excavations with rotors. Technique using computer programs and package will classical methods of reviewing and analyzing the loads of excavations with rotors, which appear in real conditions. Keywords: excavations with rotors, dynamic model, potential energy, generalization coordinate. 1. INTRODUCTION Exploitation of the mineral surface, first of all the coal, requires vehicles with large capacity, with relatively small expenditure of energy specific. Intensive development in recent years, excavation with the rotor have achieved priority in comparison.Scheme is presented excavation with rotor characteristics: Dr=12.5 m, Pr=1000 kW, Qt=6000 m3 / h, t = 3800, firm KRUPP, produced in 1989 [3]. Figure 1. Excavation with rotor. 2. APPOINTMENT OF GENERAL RESISTANCE DIGGING Fundamental characteristics of the process digging to excavation with rotor are essentially the work of her unceasing. During this number of pail involvement in the base that is variable. In each bucket, which is in contact with the base that affects resistance digging, [1,2].Given the real resistance in digging edged the secant pail, can that components of the resistance of normal and tangential resistance digging affects the rotation of rotor, while the side components are the normal. Given the real resistance in digging edged the secant pail, can that components of the resistance of normal and tangential resistance digging affects the rotation of rotor, while the side components are the normal. Depending on the direction of movement of rotor, the direction of the wing to rotor, edged one side,