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1. (WO1979000148) METHOD AND MEANS FOR SCRAPING SURFACES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000148 International Application No.: PCT/SE1978/000044
Publication Date: 22.03.1979 International Filing Date: 15.09.1978
IPC:
B01J 2/12 (2006.01) ,C22B 1/24 (2006.01) ,F27B 7/18 (2006.01) ,F27B 7/20 (2006.01) ,F27D 25/00 (2010.01) ,B01F 15/00 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
J
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
2
Processes or devices for granulating materials, in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
12
in rotating drums
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
B
PRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
1
Preliminary treatment of ores or scrap
14
Agglomerating; Briquetting; Binding; Granulating
24
Binding; Briquetting
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
27
FURNACES; KILNS; OVENS; RETORTS
B
FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
7
Rotary-drum furnaces, i.e. horizontal or slightly inclined
14
with means for agitating or moving the charge
18
the means being movable within the drum
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
27
FURNACES; KILNS; OVENS; RETORTS
B
FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
7
Rotary-drum furnaces, i.e. horizontal or slightly inclined
20
Details, accessories, or equipment peculiar to rotary-drum furnaces
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
27
FURNACES; KILNS; OVENS; RETORTS
D
DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
25
Devices for removing incrustations
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
F
MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
15
Accessories for mixers
Applicants:
Inventors:
Priority Data:
771037215.09.1977SE
Title (EN) METHOD AND MEANS FOR SCRAPING SURFACES
(FR) PROCEDE ET MOYENS POUR RACLER LES SURFACES
Abstract:
(EN) A method and an apparatus for operating a rotating apparatus, e.g. mixing drums or balling devices which comprise a rotating or reciprocating scraping device, e.g. in a balling drum (1). Said scraping device (6, 7) forms a periodically recurring pattern of scraping marks (8) in the particle layer (3) on the surface of the balling drum (1). The scraping device is frequently subjected to disturbing influences and may get into violent vibrations which may be accompanied by the formation of a vibration sustaining pattern superimposed on the periodically recurring pattern of scraping marks (8). Said disturbing effects can be eliminated by destroying the vibration sustaining pattern or simultaneously the vibration sustaining pattern and the periodicaly recurring scraping marks (8) pattern. An especially advantageous embodiment comprises changing the speed of the scraping device (6, 7) in an apparatus stated above with a rotating scraping device (6, 7) with intervals which are short enough to prevent that there is sufficient time for development of a vibration sustaining pattern in the periodically recurring scraping marks (8) pattern.
(FR) Procede et appareil a recipient rotatif comprenant un dispositif de raclage tournant ou alternatif, par exemple un melangeur a tambour ou un dispositif pour l"agglomeration de substances. Ledit dispositif de raclage (6, 7) forme des ondes periodiques de raclage (8) dans la couche de particules (3) sur la surface du tambour agglomerateur (1). Le dispositif de raclage est frequemment sujet a des influences perturbatrices et peut entrer en violentes vibrations qui entrainent la formation d"ondes de vibration entretenues superposees aux ondes periodiques de raclage (8). Lesdits effets perturbateurs peuvent etre elimines par destruction des ondes de vibration entretenues ou simultanement de l"onde de vibration entretenue et de l"onde periodique de raclage (8). Une disposition particulierement avantageuse consiste a changer la vitesse du dispositif de raclage (6, 7) dans un appareil du type mentionne ci-dessus de maniere que les intervalles de raclage soient suffisamment courts pour eviter le developpement d"ondes de vibrations entretenues superposees aux ondes periodiques de raclage (8).
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)