Machine tools abstract
A device for receiving and separating chips and coolant collecting
on machine tools, having a filter drum (12) that has an internal
bearing ring (13) on each of its two ends, which each engage in
an external bearing ring (16) so that they rotate together, spring
elements (19), which run parallel to the axis of the filter drum
(12), are provided which are supported on one side on the internal
bearing ring (13) and on the other side on the external bearing
ring (16), each of the external bearing rings (16) is seated in
a bearing shell (23 24), which is fixed to the housing, and is
supported on it in the axial direction, and sealing elements (17)
are provided between each of the internal bearing rings (13) and
the external bearing rings (16).
Machine tools claims
What is claimed is:
1. A device for receiving and separating chips and coolant collecting
on machine tools, the coolant being returned for reuse and the shavings
being removed, comprising: a receiving tank to receive the chips
and the coolant; a rising guide section adjoining the receiving
tank; an elevated discharge section adjoining the guide section;
a chain-like closed transport element, which, at least in the region
receiving the chips and the coolant and in the discharge section,
is guided over at least first and second deflection elements, at
least one of which is coupled to a rotary drive; and a filter drum
rotatably mounted in a housing, which is in drive connection with
the transport element, wherein: the filter drum comprises an internal
bearing ring on each of its two ends, each of which engages in an
external bearing ring so that they rotate together; spring elements,
which run parallel to the axis of the filter drum, are provided
which are supported on one side on the internal bearing ring and
on the other side on the external bearing ring; each of the external
bearing rings is seated in a bearing shell, which is fixed to the
housing, and is supported on it in the axial direction; and sealing
elements are provided between each of the internal bearing rings
and the external bearing rings.
2. The device according to claim 1 wherein the bearing shell,
which is fixed to the housing, comprises multiple parts.
3. The device according to claim 2 wherein each of the external
bearing rings forms a labyrinth seal with the bearing shell, which
is fixed to the housing.
4. The device according to claim 3 wherein at least one annular
sealing element is positioned in the course of each labyrinth seal.
5. The device according to one of claims 1 2 3 or 4 wherein
the internal diameter of the internal bearing ring is tailored to
the smallest internal diameter of the external bearing ring and
to the internal diameter of the filter drum.
6. The device according to one of claim 5 wherein the external
bearing shell has a pressure connection for supplying filtered coolant
to wash the space between the external bearing ring and the bearing
shell, which is fixed to the housing.
7. The device according to one of claims 1 2 3 or 4 wherein
the bearing shell has a pressure connection for supplying filtered
coolant to wash the space between the external bearing ring and
the bearing shell, which is fixed to the housing.
Machine tools description
The present invention relates to a device for receiving and separating
chips and coolant collecting on machine tools, the coolant being
returned for reuse and the chips being removed, having a receiving
tank to receive the chips and the coolant, a rising guide section
adjoining the receiving tank, an elevated discharge section adjoining
the guide section, a chain-like closed transport element, which,
at least in the region receiving the chips and the coolant and in
the discharge section, is guided over deflection elements, at least
one of which is coupled to a rotary drive, and a rotatably mounted
filter drum, which is in drive connection to the transport element.
The bearings of such a filter drum are also necessarily subjected
to axial stress and, as a consequence, are also always subject to
wear.
The object of the present invention is therefore, above all, to
reduce the wear occurring through axial bearing load and lower the
requirements on the elements cooperating in the axial direction
in a device of the type initially described.
This object is achieved according to the present invention in that
the filter drum has an internal bearing ring on each of its two
ends, each of which engages in an external bearing ring so that
they rotate together, spring elements, which run parallel to the
axis of the filter drum, are provided which are supported on one
side on the internal bearing ring and on the other side on the external
bearing ring, each of the external bearing rings is seated in a
bearing shell, which is fixed to the housing, and is supported on
it in the axial direction, and sealing elements are provided between
each of the internal bearing rings and the external bearing rings.
Slight tolerance deviations between the internal and external bearing
rings may be compensated by the arrangement of spring elements here.
In this case, the spring elements are preferably seated in a bore
of the internal bearing ring and act on a face of the respective
external bearing ring. Sealing elements between these two bearing
rings prevent unfiltered coolant from being able to pass into the
clean region by going around the filter. The spring pressure on
the external bearing ring is transmitted in the axial direction
onto the bearing shell, which is fixed to the housing, i.e., into
a zone in which the radial surfaces slide on one another and wear
occurs. The spring pressure acting on the external bearing ring
causes compensation in the event of this type of wear.
The device according to the present invention may be implemented
in such a way that each of the external bearing rings forms a labyrinth
seal with the bearing shell, which is fixed to the housing. For
this purpose, it is expedient for the bearing shell, which is fixed
to the housing, to be implemented in multiple parts. In addition,
an annular sealing element may be arranged in the course of the
labyrinth seal to further promote sealing.
In addition, it is possible to prevent the escape of unfiltered
coolant into the clean region by applying filtered coolant under
excess pressure to the seal from the outside, so that escape of
unfiltered coolant to the outside, and therefore into the region
of the filtered coolant, is counteracted very reliably. Furthermore,
this prevents chips, which produce increased wear of the bearing,
from being washed into the bearing with the unfiltered coolant penetrating
into the bearing.
To prevent deposits in the inside of the filter drum, it may be
expedient for the inner diameter of the internal bearing ring to
be tailored to the smallest internal diameter of the external bearing
ring and the internal diameter of the filter drum.
In the following, several embodiments of the device according to
the present invention are described with reference to the drawing.
FIG. 1: shows a schematic side view of a device of the type described
here,
FIG. 2: shows a detail view of a filter drum connected to a scraper
chain,
FIG. 3: shows an axial section through the filter drum,
FIG. 4: shows a detail view of the bearings of the filter drum
shown in FIGS. 2 and 3
FIG. 5: shows a detail view of a filter drum connected to a hinged
belt conveyor,
FIG. 6: shows an axial section through the filter drum shown in
FIG. 5
FIG. 7: shows a detail section concerning the bearings of the filter
drum shown in FIGS. 5 and 6 and
FIG. 8: shows a detail section of bearing ring and pressure connection.
FIG. 1 shows the side view of an embodiment of the device according
to the present invention having a receiving tank 1 which is open
on top and receives the chips and coolant collecting on the machine
tools. This receiving tank has an overflow edge 2. A rising guide
section 3 which transits into an elevated discharge section 4
adjoins the receiving tank.
A scraper belt, guided on both sides by rollers, is provided here
as a transport element. This scraper belt is guided around a lower
deflection element 6 on the end of receiving tank 1 and runs around
an upper deflection element 7 which is coupled to a drive, not
shown, in the region of discharge section 4. The scraper belt carries
scraper elements 9 arranged at intervals, which project downward
in the region of the lower conveyor section, i.e., in the direction
toward the bottom of receiving tank 1 and/or toward side wall 10
of rising section 3. The transport direction of scraper belt 5 is
indicated by arrow 11.
A filter drum 12 is provided which is rotatably mounted in the
housing of the device. The two ends of filter drum 12 are implemented
as identical mirror images of one another.
They have an internal bearing ring 13 which carries filter covering
14 and engages axially outward in a shoulder seat 15 of an external
bearing ring 16. Internal bearing ring 13 is therefore partially
overlapped by shoulder seat 15 of external bearing ring 16. A sealing
ring 17 is provided in the region of this overlap, which prevents
unfiltered coolant from passing into the inside of the drum filter
in the region of this overlap.
Internal bearing ring 13 is connected to external bearing ring
16 in the region of shoulder seat 15 which ensures that both bearing
rings always rotate together, and therefore relative movements do
not arise in the region of shoulder seat 15. Sealing ring 17 is
therefore only statically stressed.
Multiple bores 18 which run parallel to the axis of drum filter
12 are provided in internal bearing ring 13 in each of which coil
springs 19 are seated, which press against face 20 of external bearing
ring 16. This has the consequence that external bearing ring 16
performs a pressure against external element 23 of the bearing shells
mounted in the housing of the device via angular section 22 provided
on its external axial edge. Occurrences of wear must be expected
here in the course of time between angular section 22 and external
element 23 of the bearing shells. Such occurrences of wear are compensated
through the axial pressure performed by coil springs 19 without
anything further.
External element 23 of the bearing shell is connected to an internal
element 24 which, in its radially internal region, has an edge-shaped
profile 25 which engages in the angular section of external bearing
ring 16. Therefore, a labyrinth seal, which prevents the escape
of unfiltered coolant, is formed on one side by the cooperation
of external bearing element 23 and internal bearing element 24
and external bearing ring 16 with its hook-shaped angular section
22. This may be encouraged if filtered coolant is passed through
the course of the seal in the region of the bearing. External bearing
ring 16 is expanded conically toward the outside and its internal
diameter is tailored to that of internal bearing ring 13 and the
tension of the drum seal.
In the embodiment illustrated, a scraper belt 5 is provided which
is guided on both sides via rollers 27.
The embodiment shown in FIGS. 5 to 7 differs from that previously
described only in that a hinged belt conveyor 28 is provided in
this case, which is also supported on both edges via rollers 27.
FIG. 8 shows internal bearing ring 13 which engages via screw
29 in external bearing ring 16 so that they rotate together. The
bearing shell, which is fixed to the housing, and which is formed
from internal bearing element 24 and external bearing element 23
has a pressure connection 26 via which the labyrinth seal formed
from external bearing ring 16 and the bearing shell, which is fixed
to the housing, is washed with filtered coolant.
LIST OF REFERENCE NUMBERS
1 receiving tank 2 overflow edge 3 guide section 4 discharge section
5 scraper belt 6 deflection element 7 upper deflection element 8
- 9 scraper elements 10 side wall 11 arrow 12 filter drum 13 internal
bearing ring 14 filter covering 15 shoulder seat 16 external bearing
ring 17 seal 18 bore 19 coil springs 20 face 21 - 22 angular section
23 external bearing element 24 internal bearing element 25 edge-shaped
profile 26 pressure connection 27 roller 28 hinged belt conveyor
29 screw
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