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Application of The New Shape Crushing Plate in Machine Crushing Processes

Ciężkowski Paweł, Maciejewski Jan, Bąk Sebastian, Kwaśniewski Arkadiusz

Studia Geotechnica et Mechanica

2020

Vol. 42, nr 1

83--96

The results of studies of the crushing process in a double toggle jaw crusher are presented. This process was carried out on six sets of crushing plates. The first three of them are used in industrial crushers – plates with a flat working surface and a triangular profile (in this work, under consideration were profiles with teeth angle γ = 90°). The fourth and fifth type refer to plates with a variable pitch t and teeth height with a triangular shape of the teeth. In the sixth solution, plates with variable pitch and width of the wedged teeth are proposed. The results of the basic process parameters are shown, that is, average degree of fineness n, technical performance Wt, crushing energy L and crushing force F, sieve analysis of crushing product. The obtained results are the basis for the assessment of the suitability of various types of plates, especially plates with a new profile, which have an altered shape in comparison with the plates used in crushers so far. The crushing tests were carried out with the same dimension of outlet slot er = 24 mm, close to the pitch size for plates with triangular profile. Tests were performed on the "Mucharz" sandstone. Samples from a series of blocks of different size and geometric shape were prepared. This work also presents feed mass influence on crushing process efficiency. The plates with variable pitch and width of teeth are beneficial because of lower crushing force and energy.

Correlation of energy consumption and shape of crushing plates

Ciężkowski P.

AGH Journal of Mining and Geoengineering

2012

Vol. 36, no. 2

91-100

Working chambers of jaw crushers are furnished with different types of crushing jaws. Their configuration makes substantial influence on energy consumption and magnitude of crushing forces. The previous approach [10] considered analysis of distribution and values of forces generated in working space of the jaw crusher. The current stage of investigations is addressed to energy effectiveness of the new crushing plates. The specific measurements of the crushing energy were made on laboratory double-toggle jaw crusher. The obtained results were compared to the energy associated to rock crushing by three-angular tips shape and smooth plates. The three domestic rocks: Morawica limestone, Mucharz sandstone and Strzegom granite, with maximum grain size up to 95 mm, were used in the tests. It is worth of noting that crushing energy consumption decreases significantly for variable pitch and height of jaw tips.

Komory robocze kruszarek są wyposażone w różne rodzaje płyt drobiących. Ich działanie wpływa na wartości sił i energii kruszenia nadawy. Zagadnienia te mają istotne znaczenie w energochłonności procesu rozdrabniania. Procesy te rozpatrywano w odniesieniu do sił kruszenia [10]. Niniejszy etap pracy (etap II) poświęcono zbadaniu nowych konstrukcji płyt drobiących. Badania przeprowadzono na laboratoryjnej kruszarce dźwigniowej typu Blake'a. Polegały one na pomiarach pracy kruszenia. Uzyskane wyniki porównano z wynikami przy zastosowaniu płyt o gładkiej powierzchni roboczej i płyt profilowanych trójkątnymi karbami. Testy laboratoryjne przeprowadzono wykorzystując trzy rodzaje skał: wapień zwarty z kopalni Morawica, piaskowiec Mucharz oraz granit Strzegom o maksymalnym uziarnieniu do 95 mm. Otrzymano wartościowe rezultaty o dużym znaczeniu poznawczym. Okazało się, że zastosowanie płyt o zmiennej podziałce t i wysokości karbów h wpływa korzystnie na obniżenie energochłonności procesu.