Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1985-04-30
1987-08-25
Makay, Albert J.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34126, 34130, F26B 1718
Patent
active
046883363
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a temperature-controlling machine for material in lumps, preferably a dryer, more particularly for pasta, comprising a drum having a number of peripheral chambers with conveying devices for the processed material, the chambers being surrounded by a wall, two opposite portions of which face the walls of neighbouring chambers and two other portions are associated with the outer periphery and an inner periphery of the drum, at least the last wall portions having perforated walls.
A past dryer of this kind is known from IT-PS No. 512 118. Although we are speaking here about a temperature-controlling machine in general, we mean that a machine of this kind is of course also suitable for cooling and for any kind of heat or cold treatment in general. The use of such machines is therefore not restricted to pasta; they can also be used for heattreatment of products such as nuts or beans of all kinds, or for mineral material in lumps. In known machines of this kind, the conveying device in each chamber comprises a sort of screw formed by suitably shaped walls but disposed immovably in the chamber and only rotating eccentrically around the drum axis at each rotation of the drum. As a result, the lumpy material moves by gravity along the screw pitches, resulting in gentle conveying and reducing the risk of squashing or excessive wear. However, there are also some known pasta dryers in which a driven screw is disposed inside each chamber, in which case the chambers are usually cylindrical.
In each case, however, the individual chambers are disposed at the drum periphery, leaving a cavity at the centre of the drum. This cavity is equal in size to the inner diameter of the drum and is separated from each chamber by a perforated wall, in the same way as at the outer drum periphery. Consequently each chamber forms an outward duct for drying air, which usually flows transversely through the drum. In the Italian specification, the perforated wall at the outer and inner drum periphery is secured to the chamber casing. If the material sticks, therefore, access to the inside of the casing is made difficult, with the result that cleaning becomes practically impossible. In the case of shelf pasta dryers without a conveyor, lateral covers have already been proposed for the individual shelves bounded by perforated walls (German PS No. 320 526) but the covers have not given good results, because they almost inevitably leave cracks through which the material for drying can penetrate and foul up the machine or where the material is trapped and inadequately ventilated and consequently inadequately dried. If the still-pasty material returns to the chamber, it can stick and foul up the inside.
The aim of the invention is to ensure easy access to the interior of the chamber, thus facilitating cleaning, and also to provide simple operating means for this purpose. Another aim is to simplify the assembly process.
To this end, according to the invention, a perforated wall which can be brought from a closed position into an open position raised from the other wall portions is provided on at least one drum periphery, and a retaining device and a tensioning device are provided for the perforated wall. Consequently the screen can be made accessible from all sides simply by releasing the tensioning device, after which the removable perforated wall is either pivoted around the retaining means or taken out from it.
According to the invention, a special perforated wall is preferably provided for co-operating with the retaining device, characterised in that it has, at least at one end, at least one opening for engaging a retaining device. The retaining device on the screen side then co-operates with the retaining device on the machine side and/or the tensioning device.
Another method of solving the previously-described problem by the idea of subdivision or easy removability is as follows: the drum, between plates at its two ends, is subdivided at least once by an additional plate in the axial direction, advantageously into equa
REFERENCES:
patent: 1711188 (1929-04-01), Triulzi
Egger Friedrich
Gautschi Andreas
Gebrueder Buehler AG
Makay Albert J.
Westphal David W.
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