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EP 2 631 371 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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26.03.2014 Bulletin 2014/13 |
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Date of filing: 25.02.2013 |
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International Patent Classification (IPC):
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Screening bucket
Sieblöffel
Godet de criblage
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Designated Contracting States: |
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AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
NO PL PT RO RS SE SI SK SM TR |
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Priority: |
24.02.2012 IT TO20120162
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Date of publication of application: |
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28.08.2013 Bulletin 2013/35 |
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Proprietor: Cangini Benne S.R.L. |
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47027 Sarsina (FC) (IT) |
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Inventor: |
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- Cangini, Davide
47025 Mercato Saraceno (IT)
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Representative: Roncuzzi, Davide |
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Roncuzzi & Associati S.r.l.
Via Antica Zecca, 6 48121 Ravenna 48121 Ravenna (IT) |
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References cited: :
EP-A1- 2 204 501 WO-A1-2004/089557 DE-U1-202006 005 070
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EP-A2- 2 278 078 DE-A1- 10 064 149 US-A1- 2008 116 119
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The present invention relates to a screening bucket of the type adapted to be applied
to machines for handling loose material, in particular earth, such as excavators or
loading machines, for selecting, crushing and separating scrap material resulting
from demolitions, excavations or reclamation of rocky soil, for example.
[0002] As known, the screening buckets of the above-mentioned type have a front opening
for loading the material and a rear opening facing the front opening and closed by
a screening group consisting of a plurality of blade drums, which are arranged adjacent
and parallel to one another and are supported, at the respective axial ends and with
the interposition of bearings, by two fixed plates, usually the lateral walls of the
bucket, in order to rotate, in use, about the respective longitudinal axes and allow
the selected material to escape through the spaces between one drum and the other.
[0003] The drums are usually actuated by a hydraulic motor and a mechanical transmission,
which comprises a first toothed pulley keyed onto the output shaft of the motor and
a plurality of second toothed pulleys keyed onto respective ends of the drums outside
said fixed plates and coupled to the first toothed pulley by means of chains. In order
to prevent dirt and shocks from damaging the transmission, the latter is usually insulated
from the outside by a sturdy protective shell releasably mounted to the exterior of
said fixed plates.
[0004] A screening bucket of this type is described in
EP2204501, for example.
[0005] The above-described screening buckets usually suffer from a drawback resulting from
the fact that whenever the screening buckets need to be removed for being replaced
with new, unworn drums or with different drums, the operations of removing and replacing
the drums are relatively complex and require a fair accuracy of execution by the operator,
as they also need the removal and replacement of the whole transmission. Such a drawback
is particularly burdensome if we consider that, very often, the replacement of the
screening group is carried out on site, where the operating conditions are usually
difficult due to the presence of mud and dust, and certainly not adapted to work on
components such as those of the transmission.
[0006] It is an object of the present invention to provide a screening bucket which allows
the above-described drawback to be overcome.
[0007] According to the present invention, there is provided a screening bucket as claimed
in claim 1, and preferably as claimed in any one of the subsequent claims either directly
or indirectly depending on claim 1.
[0008] The present invention will now be described with reference to the accompanying drawings,
which show a non-limiting embodiment thereof, in which:
- figure 1 is a perspective view, with parts removed for clarity and exploded parts,
of a preferred embodiment of the screening bucket of the present invention;
- figure 2 is a perspective view of the screening bucket in figure 1, with exploded
parts;
- figure 3 shows a perspective view of a detail of figure 1, with parts removed for
clarity; and
- figure 4 shows a side elevation view of the screening bucket in figure 2.
[0009] In figures 1 and 2, reference numeral 1 indicates as a whole a screening bucket adapted
to be applied to an operating machine (not shown) for handling loose material, in
particular earth, such as excavators or loading machines, for selecting, crushing
and separating scrap material resulting from demolitions, excavations or reclamation
of rocky soil, for example.
[0010] Bucket 1 comprises a trapezoidal hollow body 2 delimited by a flat lower wall 3 having
a toothed edge 4, by two lateral walls 5 transversal to the lower wall 3, and by an
upper wall 6 facing the lower wall 3, which carries hooks 7 for connecting bucket
1 to the operating machine (not shown), and together with lower wall 3 and lateral
walls 5, delimits a front opening 8, delimited at the bottom by the toothed edge 4,
for loading the material and a rear opening 9 having a generally rectangular shape
and facing the front opening 8.
[0011] Bucket 1 further comprises a screening group 10, which is arranged at the bottom
of the hollow body 2, closes the rear opening 9 and is actuated, in use, once bucket
1 has been loaded, lifted off the ground and arranged with the front opening 8 upwards,
for separating and possibly crushing the material loaded and letting the selected
material fall outside.
[0012] As shown in figures 1 and 2, the screening group 10 comprises a support frame 11,
which is firmly connected to the hollow body 2, is shaped as a rectangular frame which
surrounds the rear opening 9, and comprises an upper plate 12 and a lower plate 13
parallel to each other and arranged at respective long sides of the rear opening 9,
and two lateral plates 14 and 15, which are arranged at respective short sides of
the rear opening 9, are parallel to each other and transversal to the lower 12 and
upper 13 walls and are substantially coplanar to the respective lateral walls 5 of
the hollow body 2.
[0013] The upper 12, lower 13 and lateral 14 plates are flat plates having a generally rectangular
shape, while the lateral plate 15 has a rectangular recess 16 along a rear edge thereof
opposite to the edge connected to the lateral wall 5, which recess imparts a C shape
to the lateral plate 15 and is usually closed by a counter-plate 17 removably connected
to the outer surface of the lateral plate 15.
[0014] The screening group 10 further comprises a plurality of blade drums 18, which extend
adjacent to one another through the rear opening 9 and are supported by frame 11 to
rotate about respective longitudinal axes 19 parallel to one another and perpendicular
to the lateral plates 14 and 15.
[0015] Drums 18 are screening drums of the known type, and each of them generally comprises
a shaft 20 and a plurality of suitably shaped disc blades 21, which are keyed onto
shaft 20, are evenly distributed along the longitudinal axis 19 and are adapted to
cooperate, in use, with the blades 21 of the other drums 18 and with two combs 22
fixed to the inner sides of the upper 12 and lower 13 plates for crushing and selecting
the material within bucket 1. For simplicity reasons, the example described relates
to a screening group 10 having only two drums 18 rotatable about respective longitudinal
axes 19 coplanar to each other; obviously, the number of drums 18 may be greater than
two and the respective longitudinal axes 19 may be offset to each other.
[0016] With reference to figures 2 and 3, the screening group 10 finally comprises a unit
23 for actuating drums 18, comprising a hydraulic actuator 24 which is mounted outside
the upper plate 12 close to the lateral plate 14, is provided with couplings for the
connection to the oil hydraulic circuit of the operating machine (not shown), and
has an output shaft 25 which extends, with the interposition of a bearing 26, through
the lateral plate 14 to rotate about a respective axis 27 perpendicular to the lateral
plate 14 itself and parallel to the longitudinal axes 19.
[0017] The actuating unit 23 further comprises a mechanical transmission 28 serving the
function of transferring the rotational motion from the output shaft 25 to the shafts
20 of drums 18. As shown in figures 2 and 3, transmission 28 is mounted to the outer
surface of the lateral plate 14, is enclosed into a protective shell 29 fixed to the
lateral plate 14, and comprises a toothed pulley 30 keyed onto the free end of the
output shaft 25 and a plurality of toothed pulleys 31 angularly coupled to one another
and to the toothed pulley 30 by means of chains.
[0018] In the example shown, there are four pulleys 31 which are grouped in two pairs, each
of which is associated with a respective drum 18 and is keyed onto a shaft 32, which
is coaxial to the longitudinal axis 19 of the related drum 18 and is rotatably mounted
through the lateral plate 14 by the interposition of a respective bearing 33 fixed
to the lateral plate 14 by means of a fixing plate 34.
[0019] The transmission of the rotational motion from output shaft 25 to shafts 32 is carried
out by means of a first chain 35, which is wound about pulley 30 and about a pulley
31 of a first pair of pulleys 31, and by means of a second chain 36 which is wound
about the other pulley 31 of the first pair and about a pulley 31 of the second pair.
The other pulley 31 of the second pair remains unused and could theoretically be missing.
The reason why the use of identical shafts 32, i.e. having the same number of pulleys
31, is preferred is that shafts 32 are thus interchangeable, whatever their number
inside the transmission 28, with obvious advantages in terms of reduction in design
costs and assembly time of transmission 18.
[0020] Each shaft 32 has a free end, which protrudes beyond the lateral plate 14 and is
angularly coupled to an axial end of the shaft 20 of a respective drum 18 by means
of a releasable axial plug-in fast joint 37.
[0021] In particular, as shown in figures 3 and 4, each joint 37 is of the radial teeth
type and comprises a grooved shaft 38, which is directly obtained on the free end
of the respective shaft 32, or is integrally connected thereto, and engages a grooved
hole 39 obtained on the axial end of shaft 20 in a position coaxial to the longitudinal
axis 19.
[0022] At the opposite axial ends thereof, drums 18 are rotatably supported by counter-plate
17 through respective bearings 40, each of which is carried by counter-plate 17, is
coaxial to a respective longitudinal axis 19, and is releasably engaged by a tang
41 defining the free end of a respective shaft 20.
[0023] In particular, as shown in figure 4, counter-plate 17 accommodates bearings 40 at
a central bulging portion 17a thereof, which extends through recess 16 towards drums
18 and has a thickness approximately equal to the length of each grooved shaft 38,
so as to axially lock the drums 18 between counter-plate 7 and lateral plate 14.
[0024] From the size point of view, it should be noted that the sum of the length of each
drum 18 free from tang 41 and of the length of the respective grooved shaft 38 is
lower than the distance between the lateral walls 14 and 15, and the distance between
tangs 41 is lower than the height of recess 16.
[0025] In use, when drums 18 need to be replaced, it is sufficient to detach the counter-plate
17, and bearings 40 therewith, from the lateral plate 15 and axially extract the drums
18 up to causing the release of the respective joints 37, and at that point transversally
remove drums 18. The assembly operation is carried out by performing the same operations
in the reverse order, i.e. by arranging the drums 18 into frame 11 in axial alignment
with the grooved shafts 38 (figure 4), by axially moving drums 18 towards the lateral
plate 14 so as to cause the fitting of joints 37, inserting the portion 17a of counter-plate
17 through recess 16 so as to introduce the tangs 41 into the respective bearings
40, and finally locking the counter-plate 17 on the lateral plate 15.
[0026] To conclude the above description, it should be noted that according to variants
not shown, the axial plug-in fast joints 37 may be of a different type from that described.
For example, each joint 37 may consist of a shaft with key or of a free shaft provided
with a removable pin.
[0027] Moreover, according to a variant (not shown), each grooved shaft 38 is integral with
and coaxial to the respective shaft 20, and each grooved hole 39 is axially obtained
on the respective shaft 32.
[0028] Finally, according to a further variant (not shown), the upper 12, lower 13 and lateral
14 and 15 plates may be integrally obtained with the hollow body 2 as extensions of
the lower wall 3 and of the upper wall 6 and the lateral walls 5, respectively.
1. A screening bucket having a loading front opening (8) and a rear opening (9) facing
the front opening (8), and comprising a screening group (10), which is arranged through
the rear opening (9) and comprises a support frame (11) and a plurality of screening
drums (18) mounted to the frame (11) to rotate about respective longitudinal axes
(19) parallel to one another; the bucket (1) further comprising actuating means (23)
adapted to rotate the drums (18) about the respective longitudinal axes (19) and comprising
a mechanical transmission (28); the frame (11) comprising a first plate (14) and a
second plate (15) perpendicular to said longitudinal axes (19) and arranged on opposite
sides of the rear opening (9); and the mechanical transmission (28) being mounted
to the first plate (14) and comprising, for each drum (18), a respective power take-off
(38) mounted through the first plate (14); the screening bucket (1) being characterized in that each power take-off (38) is angularly coupled to an end of the respective drum (18)
in a releasable manner by means of an axial plug-in fast joint (37).
2. The screening bucket claimed in claim 1, comprising a counter-plate (17), which is
parallel to the first plate (14), is arranged opposite to the rear opening (9) with
respect to the first plate (14), is releasably coupled to the frame (11), and supports
the ends of the drums (18) opposite to those coupled to the power take-offs (38),
in a rotatable and releasable manner.
3. The screening bucket claimed in claim 2, wherein the second plate (15) has a through
opening (16) facing the first plate (14); the counter-plate (17) being releasably
connected to the second plate (15) to close said through opening (16) and axially
lock the drums (18) between the first plate (14) and the counter-plate (17) itself.
4. The screening bucket claimed in one of the preceding claims, wherein said joint (37)
is a toothed joint.
5. The screening bucket claimed in one of the preceding claims, wherein said joint (37)
comprises an externally grooved shaft (38), which is coaxial to the respective drum
(18) and defines a respective said power take-off (38).
6. The screening bucket claimed in claim 5, wherein the first plate (14) and the second
plate (15) are arranged at a certain distance from each other at least equal to the
sum of a length of the externally grooved shaft (38) and the length of the respective
drum (18).
7. The screening bucket claimed in claims 3 and 6, wherein the counter-plate (17) is
provided with a central bulging portion (17a) which carries, for each drum (18), a
rotatable support (40); the central bulging portion (17a) extending through said through
opening (16) and having a thickness approximately equal to the length of each externally
grooved shaft (38).
8. The screening bucket claimed in one of the preceding claims, wherein the mechanical
transmission (28) is mounted to a external surface of the first plate (14) and comprises
a first inlet shaft (25) and, for each drum (18), a second shaft (32) rotatably mounted
through the first plate (14), and chain transmission means (35, 36) interposed between
the first shaft (25) and the second shaft (32).
1. Siebschaufel, umfassend eine vordere Ladeöffnung (8) und eine hintere Öffnung (9),
die der vorderen Öffnung (8) zugewandt ist, und aufweisend eine Siebgruppe (10), die
durch die hintere Öffnung (9) angeordnet ist und die einen Halterahmen (11) und eine
Vielzahl von Siebtrommeln (18), die auf dem Rahmen (11) befestigt sind, so dass sie
um entsprechende parallel zueinander angeordnetete Längsachsen (19) rotieren, aufweist;
die Schaufel (1) umfasst ferner Aktuatormittel (23), die eingerichtet sind um die
Trommeln (18) um die entsprechenden Längsachsen (19) zu rotieren und die ein mechanisches
Getriebe (28) aufweisen; der Rahmen (11) umfasst quer zu den Längsachsen (19) eine
erste Platte (14) und eine zweite Platte (15), die an gegenüberliegenden Seiten der
hinteren Öffnung (9) angeordnet sind; und das mechanische Getriebe (28) ist an der
ersten Platte (14) befestigt und umfasst für jede Trommel (18) einen entsprechenden
Abtrieb (38), der durch die erste Platte (14) befestigt ist; die Siebschaufel (1)
ist dadurch gekennzeichnet, dass jede der Abtriebe (38) drehfest verbunden ist mit einem Ende der entsprechenden Trommel
(18) in einer lösbaren Weise anhand einer axialen Einsteck-Schnellverbindung (37).
2. Die Siebschaufel wie beansprucht in Anspruch 1, umfassend eine Gegenplatte (17), die
parallel zur ersten Platte (14) ist, und die im Hinblick auf die erste Platte (14)
gegenüber der hinteren Öffnung (9) angeordnet ist, und die lösbar verbunden ist mit
dem Rahmen (11), und die diejenigen Enden der Trommeln (18) stützt, die gegenüber
zu denjenigen sind, die in einer drehbaren und lösbaren Weise verbunden sind mit den
Abtrieben (38).
3. Die Siebschaufel wie beansprucht in Anspruch 2, wobei die zweite Platte (15) eine
Durchgangsöffnung (16) umfasst, die der ersten Platte (14) zugewandt ist; die Gegenplatte
(17) ist lösbar verbunden mit der zweiten Platte (15) um die Durchgangsöffnung (16)
zu schließen und die Trommeln (18) axial zwischen der ersten Platte (14) und der Gegenplatte
(17) selbst zu verriegeln.
4. Die Siebschaufel wie beansprucht in einem der vorhergeheneden Ansprüche, wobei die
Verbindung (37) eine gezahnte Verbindung ist.
5. Die Siebschaufel wie beansprucht in einem der vorhergeheneden Ansprüche, wobei die
Verbindung (37) eine außen gekerbete Welle (38) aufweist, die koaxial zur entsprechenden
Trommel (18) ist und die einen entsprechenden Abtrieb (38) definiert.
6. Die Siebschaufel wie beansprucht in Anspruch 5, wobei die erste Platte (14) und die
zweite Platte (15) in einem gewissen Abstand zueinander gehalten sind, der zumindest
der Summe der Länge der außen gekerbten Welle (38) und der Länge der entsprechenden
Trommel (18) entspricht.
7. Die Siebschaufel wie beansprucht in den Ansprüchen 3 und 6, wobei die Gegenplatte
(17) mit einem zentralen wulstigen Abschnitt (17a) versehen ist, der für jede Trommel
(18) ein Drehlager (40) trägt; der zentrale wulstige Abschnitt (17a) erstreckt sich
durch die Durchgangsöffnung (16) und umfasst eine Dicke in etwa gleich zur Länge von
jeder außen gekerbten Welle (38).
8. Die Siebschaufel wie beansprucht in einem der vorhergeheneden Ansprüche, wobei das
mechanische Getriebe (28) befestigt ist an einer äußeren Oberfläche der ersten Platte
(14) und umfasst eine erste Eingangswelle (25) und für jede Trommel (18) eine zweite
Welle (32), die drehbar befestigt sind durch die erste Platte (14), und Kettenübertragungsmittel
(35, 36), die der ersten Welle (25) und der zweiten Welle (32) zwischengeschaltet
sind.
1. Godet de criblage ayant une ouverture avant de chargement (8) et une ouverture arrière
(9) tournée vers l'ouverture avant (8), et comprenant un groupe de criblage (10),
qui est agencé à travers l'ouverture arrière (9) et comprend un cadre de support (11)
et une pluralité de tambours de criblage (18) montés sur le cadre (11) pour tourner
autour d'axes longitudinaux respectifs (19) parallèles les uns aux autres ; le godet
(1) comprenant en outre des moyens d'actionnement (23) aptes à faire tourner les tambours
(18) autour des axes longitudinaux respectifs (19) et comprenant une transmission
mécanique (28) ; le cadre (11) comprenant une première plaque (14) et une seconde
plaque (15) perpendiculaires auxdits axes longitudinaux (19) et agencées sur des côtés
opposés de l'ouverture arrière (9) ; et la transmission mécanique (28) étant montée
sur la première plaque (14) et comprenant, pour chaque tambour (18), une prise de
force respective (38) montée à travers la première plaque (14) ; le godet de criblage
(1) étant caractérisé par le fait que chaque prise de force (38) est couplée de façon angulaire à une extrémité du tambour
respectif (18) d'une manière libérable, au moyen d'un joint rapide enfichable axial
(37).
2. Godet de criblage selon la revendication 1, comprenant une contre-plaque (17), qui
est parallèle à la première plaque (14), est agencée opposée à l'ouverture arrière
(9) par rapport à la première plaque (14), est couplée de façon libérable au cadre
(11) et supporte les extrémités des tambours (18) opposées à celles couplées aux prises
de force (38), d'une manière rotative et libérable.
3. Godet de criblage selon la revendication 2, dans lequel la seconde plaque (15) a une
ouverture traversante (16) tournée vers la première plaque (14) ; la contre-plaque
(17) étant reliée de façon libérable à la seconde plaque (15) pour fermer ladite ouverture
traversante (16) et bloquer axialement les tambours (18) entre la première plaque
(14) et la contre-plaque (17) elle-même.
4. Godet de criblage selon l'une des revendications précédentes, dans lequel ledit joint
(37) est un joint denté.
5. Godet de criblage selon l'une des revendications précédentes, dans lequel ledit joint
(37) comprend un arbre à cannelures extérieures (38), qui est coaxial au tambour respectif
(18) et définit une prise de force respective précitée (38).
6. Godet de criblage selon la revendication 5, dans lequel la première plaque (14) et
la seconde plaque (15) sont agencées à une certaine distance l'une de l'autre au moins
égale à la somme d'une longueur de l'arbre à cannelures extérieures (38) et de la
longueur du tambour respectif (18).
7. Godet de criblage selon les revendications 3 et 6, dans lequel la contre-plaque (17)
comporte une partie en renflement centrale (17a) qui porte, pour chaque tambour (18),
un support rotatif (40) ; la partie en renflement centrale (17a) s'étendant à travers
ladite ouverture traversante (16) et ayant une épaisseur approximativement égale à
la longueur de chaque arbre à cannelures extérieures (38).
8. Godet de criblage selon l'une des revendications précédentes, dans lequel la transmission
mécanique (28) est montée sur une surface extérieure de la première plaque (14) et
comprend un premier arbre d'entrée (25) et, pour chaque tambour (18), un second arbre
(32) montés de façon rotative à travers la première plaque (14), et des moyens de
transmission par chaîne (35, 36) interposés entre le premier arbre (25) et le second
arbre (32).


REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description