Machine tools abstract
A self-fed shredder device for shavings-removing machine tools,
including a channel element (3) in which extends a motorized auger
conveyor (4) whose terminal end (7) traverses an internally grooved
cylindrical body (14) and bears a lobed rotor (22) axially facing
the exterior of the grooved cylindrical body (14). The lobed rotor
(20) is able to rotate within a laterally open generally tubular
Machine tools claims
What is claimed is:
1. A self-fed shredder device for shavings-removing machine tools,
comprising a conveyor with a channel element for feeding the shavings,
a motor, and an auger conveyor extending along said channel and
having an initial end driven in rotation by said motor and a terminal
end which constitutes an advancing organ of a shredder assembly
including an internally grooved cylindrical sleeve positioned coaxially
to said terminal end of said auger conveyor, and a lobed rotor axially
facing the exterior of said grooved cylindrical sleeve and driven
in rotation by said auger conveyor, wherein said lobed rotor is
positioned within a generally tubular body and wherein said tubular
body is laterally open around said lobed rotor.
2. A device as claimed in claim 1 wherein said tubular body is
formed by a first annular flange borne coaxially by said grooved
cylindrical sleeve a second annular flange distanced from said first
annular flange and fastened thereto, and axial spacers interposed
between said flanges.
3. A device as claimed in claim 1 wherein said initial end of
said auger conveyor is connected to said motor by means of a rapid
axial coupling assembly.
4. A device as claimed in claim 3 wherein said rapid axial coupling
assembly comprises a frontal radial key projection of said initial
end of the auger conveyor and a swivelling support actuated by said
motor and formed with a frontal recess complementary to said key
5. A device as claimed in claim 1 wherein said motor is set laterally
side by side to said auger conveyor.
Machine tools description
FIELD OF THE INVENTION
The present invention relates to a self-fed shredder device for
shavings-removing machine tools, adapted to reduce the length of
the shavings produced by the machine tools and allow the shavings
to be transported hydraulically or pneumatically.
STATE OF THE PRIOR ART
More in particular, the invention relates to a self-fed shredder
device of the type described and illustrated in the European patent
application EP-1151822 by the same Applicant, comprising a conveyor
with a channel element for feeding the shavings, along which extends
a motorised auger conveyor having an initial end driven in rotation
by a motor and a terminal end which constitutes the advancing organ
of a trituration assembly. Said trituration assembly includes an
internally grooved cylindrical body positioned coaxially to the
end terminal of the auger conveyor, and a lobed rotor axially facing
the exterior of the grooved cylindrical body and driven in rotation
by the auger conveyor.
In said shredder device, the combined effect of the rotation of
the auger and of the presence of the inner grooves of the cylindrical
body of the trituration assembly achieves an effective action of
skeining, straightening and distending the elongated metallic shavings
while they are self-fed towards the rotor. The interaction between
the lobes of the rotor and the end of the grooved cylindrical body
which faces it achieves an action of triturating and grinding the
shavings, reducing their dimensions in length to such values that
they can be evacuated pneumatically, or hydraulically, together
with any lubricating and/or refrigerating liquids.
SUMMARY OF THE INVENTION
The present invention constitutes an enhancement of the one according
to the aforesaid document EP-1151822 and its object is further
to improve the operating effectiveness and the functionality of
the self-fed shredder device.
According to the invention, said object is achieved mainly thanks
to the fact that the lobed rotor is positioned within a generally
tubular body open laterally around the lobed rotor.
According to this solution idea, the discharge of the shavings
from the shredder assembly is considerably improved and increased
relative to the case of the shredder device known from the aforementioned
document EP-1151822: whilst in the latter the tubular body within
which the lobed rotor is capable of rotating has a lateral wall
which encloses for the most part said lobed rotor, according to
the invention the periphery of the lobed rotor is circumferentially
almost completely free, which assures a better and more complete
outflow of the triturated shavings, avoiding risks of jamming.
According to another aspect of the invention, the initial end of
the auger conveyor is connected to the motor by means of a rapid
axial coupling assembly. This characteristic also improves the functionality
of the shredder device, because it makes it far easier and more
rapid to conduct the operations of maintaining and possibly replacing
the auger conveyor due to wear, with appreciable reductions in the
inoperative idle times of the device.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention shall now be described in detail with reference to
the accompanying drawings, provided purely by way of non limiting
example, in which:
FIG. 1 is a schematic perspective view of a self-fed shredder device
according to the invention,
FIG. 2 is a partially exploded, reduced scale view of FIG. 1 and
FIG. 3 is a partial view, partially exploded and partially broken
view of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
With reference to the drawings, the self-fed shredder device according
to the invention comprises a support structure generically designated
by the reference number 1 which is adapted for its application
in correspondence with the exit of the shavings with any lubricating
and/or refrigerating liquids of one or of a group of shavings-removing
The support structure 1 bears on a side an electric motor 2 and
on the opposite side a horizontal channel element 3 set side by
side to the motor 2 and whose bottom is formed with a series of
slits, not shown in the drawings. Along the channel element 3 extends
an auger conveyor globally designated as 4 and constituted by a
shaft 5 having an initial end 6 and a terminal end 7 between which
is positioned a propeller 8.
The initial end 6 is formed with a radial key frontal projection
9 which axially engages inside a complementary frontal recess 10
of a rotary support 11 borne by the support structure 1 and driven
to rotate by the motor 2 by means of a conventional transmission,
not shown in the drawings, for instance a chain, belt, or gear transmission.
The key projection 9 and the recess 10 constitute a rapid axial
coupling assembly for the auger conveyor which appreciably facilitates
its assembling and disassembling operation for the maintenance of
The output end 7 of the shaft 5 of the auger conveyor 4 projects
outside the channel element 3 through an opening 12 of an end wall
13 of said channel element 3 and extends coaxially through a sleeve
like cylindrical body 14 fastened at one end, by means of an annular
flange 15 to the wall 13. The sleeve like body 14 is internally
formed with a circumferential series of grooves 16 directed axially
or also with an angle relative to its axis, and at the other end
it has another annular flange 17. An additional flange or annular
bottom 18 is fastened coaxially to the flange 17 at a certain distance
therefrom, by means of a series (in the illustrated example, in
the number of three angularly equidistant) spacers 19. The flanges
17 and 18 with the spacers 19 in practice define a generally tubular
body 20 with open lateral wall. The lower part of said tubular body
20 in the case of the illustrated example, has planar surface.
The terminal end 7 of the shaft 4 of the auger conveyor 5 coaxially
traverses the grooved sleeve 14 and projects beyond it with a prismatic
axial tang 21 whereon is keyed a lobed rotor 22. Said rotor 22
which thus axially faces the grooved sleeve 14 can have a number
of lobes between 2 and n, which arranged so they radially face the
open space circumferentially limited between the flanges 17 18.
In operation, the shavings with any lubricating and/or refrigerating
liquid coming from the machine tools are discharged into the channel
element 3 whilst the auger conveyor 4 is maintained in rotation
by the motor 2. The small shavings and any lubricating and/or refrigerating
fluid exit by gravity from the bottom slits of the channel element
3 towards a collecting tank for hydraulic or pneumatic transport
to a filtration system.
The shavings with greater length or massed together are transferred
by the auger conveyor 4 in the direction of the terminal end 7 thereof.
The shavings are then thrust through the grooved sleeve 14 and there
they are subjected to an unbundling and distending effect, whilst
they are simultaneously made to advance in the direction of the
rotor 22. The shavings are then subjected to a trituration and chipping
action by effect of the interaction between the edges of the lobes
of the rotor 22 and the end of the grooved sleeve 14 which faces
it. Following said trituration action, the shavings completely exit
the device both axially, through the annular flange 18 and radially
through the lateral circumferential space between the annular flanges
17 and 18 reaching the tank wherefrom they will be transferred
hydraulically or pneumatically towards the filtration system.
As described in the aforementioned document EP-1151822 the device
is also provided with a counter-rotation system, adapted to operate
automatically a rotation of the auger conveyor 4 in the opposite
direction to that of the transport of the shavings for a short time
interval, thereby eliminating negative effects due to massing and
jamming of the shavings.
Naturally, the construction details and the embodiments may be
varied widely relative to what has been described and illustrated
herein, without thereby departing the scope of the present invention
as defined in the claims that follow.