Abstract
JSC "Kharkiv Machine-Building Plant "Svitlo Shahtarja" has created and introduced into serial production a new generation UKD200-500 coal shearer. The most loaded element of the shearer is its cutting part. It is a three-stage reducer with an electric motor. Calculations for the strength and durability of gearing, shafts, bearings, spline, pinned and hinge joints have been carried out. The modeling of the stress-strain state for the main parts and assemblies by the finite element method has also been carried out. Calculations have shown that the strength and durability of all parts is ensured. Consequently, the required durability of 15000 hours and the average resource before major overhaul are not less than 800...1000 thousand tons are provided.
Highlights
The current state of the Ukrainian fuel and energy complex requires a continuous increase in coal production
The assessment of durability was carried out using the recommendations of GOST 21354–87 [6]: the slight slope of the right branch of the contact fatigue curve was taken into account at the total numbers of stress change cycles NK > NHlim
Lh = 8000...4∙107 h with the required service life [Lh] = 75000 h; – the calculated safety factors in terms of static load capacity are in the range n0 = 1,5...26,0 with the minimum allowable value [n0] = 1,0; For joints: – in spline joints, the calculated safety factors of contact stress are in the range nσ = 2,68...6,17 with the minimum allowable value [nσ] = 1,0; – in pinned joints, the calculated safety factors of contact and shear stress are in the range nσ(τ) = 1,68...7,97 with the minimum allowable value [nσ(τ)] = 1,0; – for the axes of the hinge joints, the calculated safety factors of static strength are in the range nM = 1,21...2,8 with the minimum allowable value [nM] = 1,2
Summary
The current state of the Ukrainian fuel and energy complex requires a continuous increase in coal production. As part of the implementation of the concept of development of the coal industry, approved by the order of the Cabinet of Ministers of Ukraine No 236-r dated July 7, 2005 [1], in order to extract coal from thin seams, JSC "Kharkiv Machine-Building Plant "Svitlo Shahtarja" created and introduced into serial production a new generation UKD200-500 coal shearer It is designed for mechanized coal extraction as part of mining complexes, in longwalls of shallow and inclined seams 0,85–1,5 m thickness, moving along strike with inclination angles up to 35°, as well as rise and fall with angles up to 10°, with coal cutting resistance up to 480 kN/m. It is necessary to take into account that coal mining equipment operates in especially difficult conditions These are elevated temperatures, a wide range of shock loads and extremely high dust levels. For the rest of the calculations, due to the limited volume of the article, we will present only the main results
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