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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.

Preliminary research of monitoring of soil density

Kwaśniewski Arkadiusz

Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska

2019

z. 3/121

31--39

This work presents the preliminary method for assessment of the degree of the soil compaction from two types of research performed by the author. The first type of research was the tests with sensors placed directly on the rammers foot in the laboratory stand. The second stage of works was to perform test with the same stand and the machine with sensors placed on the measuring plate nearly the rammer. The results of test are processed and on the spectrum chart in the function of frequency are presented. This allow to show the differences between the loose and compacted soil. The difference type of mounting sensors has influence to vibroacoustic signal and on the frequency spectrum.

W pracy została zaprezentowana wstępna metoda oceny stopnia zagęszczenia ośrodka gruntowego na podstawie dwóch typów badań wykonanych przez autora. Pierwszym typem były badania przy użyciu maszyny zagęszczającej grunt znajdujący się w stanowisku laboratoryjnym, z czujnikami zamocowanymi bezpośrednio do stopy maszyny. Drugim etapem prac było wykonanie testów przy użyciu tego samego stanowiska i maszyny z czujnikami umieszczonymi na płycie pomiarowej obok zagęszczarki. Obróbka uzyskanych wyników i przedstawienie ich na wykresach widma w funkcji częstotliwości, pozwoliło na ukazanie różnic pomiędzy ośrodkiem luźnym i zagęszczonym. Zostały zaprezentowane różnice pomiędzy typem umieszczenia czujników na sygnał wibroakustyczny, a także na samo widmo amplitudowo-częstotliwościowe.