Tag Archives: separating machine

450–459 M. Krupička and A. Rybka
New design of roller separation line and its effect on the separation of hop matter
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New design of roller separation line and its effect on the separation of hop matter

M. Krupička* and A. Rybka

Czech University of Life Sciences Prague, Faculty of Engineering, Department of
Agricultural Machines, Kamýcká 129, CZ165 21 Praha 9 - Suchdol, Czech Republic
*Correspondence: krupicka@tf.czu.cz

Abstract:

This article deals with the roller conveyor which constitutes a part of a machine line to separate the hops harvested from low trellises. Various parameters affecting the right operation of this roller conveyor are examined. In the last season a model of roller conveyor designed and constructed for this purpose was subject to experimental verification with the objective of integrating it in the actual line. Dependency of hop matter falling through on the gap size between rollers was examined. They were standard, commonly used rollers.
In 2015 rollers with a different diameter and different profile of metal welded collars were designed and produced. The new construction allows for reducing the gap between rollers up to 20 mm. As compared to the former solution including rollers of 60 mm in diameter, this one constitutes a difference of 28 mm.
The measurements in the season of 2015 were conducted using these new rollers and there were two parameters to examine. They were the gap size between rollers and rotation frequency of the rollers. The measurements were carried out using a hop matter sample taken from low trellises. The dependency of the hop matter falling through was being examined for 3 gaps (28, 24 and 20 mm) between rollers and for three rotation frequencies of the rollers. The measurements revealed that with a setting resulting in the smallest possible gap between rollers (20 mm) by up to 15% more leaves can be separated, compared to the rollers of 80 mm in diameter, and by approx. 60% more leaves compared to the former solution including the rollers of 60 mm in diameter. Furthermore it was found that a change in

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101-108 M. Krupička and A. Rybka
Dependency of hop material fall through on the size of gaps between rollers of the roller conveyor in separating machine
Abstract |
Full text PDF (710 kB)

Dependency of hop material fall through on the size of gaps between rollers of the roller conveyor in separating machine

M. Krupička* and A. Rybka

Czech University of Life Sciences Prague, Faculty of Engineering, Department of Agricultural Machines, Kamýcká 129, 165 21, Praha 9 - Suchdol, Czech Republic; *Correspondence: krupicka@tf.czu.cz

Abstract:

This paper deals with a roller conveyor which forms a part of the separating machine for hops harvested from low trellises. One of the parameters that influences the correct operation of this conveyor is tested, namely the gap between the rollers. The aim of the test was to discover whether the fact that hop matter falls through the rollers depends on the size of the gap between the rollers. For testing purposes a model of the roller conveyor was designed, made, and subsequently tested in a series of experiments with the purpose of integrating it into a separating machine. The measurements were carried out using a sample of hop matter harvested from low trellises. The dependency of falling matter upon the gaps was determined in view of eight gaps between the rollers. The measurements revealed that the gap size has an influence on the falling of hop cones and small-sized admixtures only if the gap size is larger than the size of the hop cones. At the same time, this parameter has no substantial influence on the separation of medium-length and long stems which were separated perfectly.

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