Improving wear resistance of elements of mining and processing equipment

Improving wear resistance of elements of mining and processing equipment, subjected to abrasion and shock loads, is an actual task, since it determines effectiveness of mining operations to a great extent. Results of industrial tests of two kinds of mining and processing equipment details, manufactured of pilot wear-resistant alloys, presented. Two sidepieces plates for jaw crushers were manufactured of steel based on 30Х3МФ grade and additionally alloyed by niobium (up to 0.15%) as a strong carbide-forming element. As a comparing sample, steel 30Х3МФ without additional alloying was used. The second kind of details to test – sprockets, used as grinding bodies in the crushers for medium ore crushing. The sprockets were casted of chromic iron with increased nickel content (up to 3.5%) to increase the shock ductility, vanadium and titanium content (together up to 1.5%) – to form carbides of MeC type at decreased chrome content (down to 16%). As the comparing sample sprockets ware used, casted of ИХЧ28 grade iron, which is used for these purposes at present. The tests were accomplished at the operating equipment during medium crushing and grinding of “Bogach” deposit ore. The test cycles corresponded to the accepted at the plants crushing cycles – 18 h. The tests were duplicated 2 times. After tests completion the percent of wear of pilot samples was evaluated. The wear was evaluated by relative mass change. The results obtained showed, that the pilot samples have higher wear resistance approximately by 30%.

Jaw crushers equipped with elastic pneumatic elements in joints of kinematic pairs

The article describes the reason of additional dynamic forces occurrence in course of operation of the lever mechanism of jaw swivel drive with gaps in hinges reducing reliability of jaw crushers operation. Gaps sampling mechanisms are equipped with elastic pneumatic elements. These pneumatic elements throughout the entire cycle of the crank-beam mechanism constantly act on the movable body with an anti-friction liner mounted on it. Mechanisms for gaps sampling provide a choice of the gap in the joints of kinematic pairs, prevent the appearance of additional dynamic loads, and reduce the level of vibration of the mechanical system. It has been experimentally established that usage of such mechanisms increases reliability of jaw crushers.

Examination of granulometry of ceramic dust which derogations while disposing waste sanitary ceramics for the use of their as addition to the concrete

The purpose of the research presented in this article was to assess the granulometry of ceramic dust in terms of their use as an additive to concrete. The material for testing came from postindustrial sanitary ceramic waste, which was subjected to a crushing process in jaw crushers. A research stand consisting of a Horoir LA-300 laser particle analyzer connected to a computer equipped with appropriate software was used to study the granulometric characteristics. As a side feature, the dust density was examined using a Le Chatelier flask. The results of the tests carried out were compared with the data obtained for the traditionally used concrete additive - silica volatile dusts.