Machine tools abstract
A device is disclosed 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 (1) to receive
the chips and the coolant, a rising guide section (3) adjoining
the receiving tank (1), an elevated discharge section (4) adjoining
the guide section (3), a chain-like closed transport element, which,
at least in the region receiving the chips and the coolant and in
the discharge section (4), is guided over deflection elements (6
7), at least one of which is coupled to a rotary drive, and a rotatably
mounted filter drum (12), which is in drive connection with the
transport element. A suggestion is made for preventing unfiltered
coolant from penetrating the tanks for filtered coolant in the event
the receiving tank overflows.This is achieved in that holders (12),
whose projecting ends, which are directed downward, extend into
an overflow channel (10), are tightly attached externally to the
wall of the receiving tank (1) the overflow channel (10) is guided
around the device at a level below the top edge (2) of the receiving
tank (1) and is removably held on the holders (12), the overflow
channel (10) tightly covers tanks (22) located beneath it having
filtered coolant, the inner edge (15) of the overflow channel (10)
neighboring the receiving tank (1) lies at a higher level than the
outer edge (16) of the overflow channel (10), which is further away
from the receiving tank (1), and at least one outlet device (17)
is provided in the bottom region of the overflow channel (10).
Machine tools claims
What is claimed is:
1. A device for receiving and separating chips and coolant fluid
collection on machine tools, the coolant being returned reuse and
the chips being removed, comprising: a receiving tank to receive
the chips and 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 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 rotatably mounted
filter drum, which is in drive connection with the transport element,
wherein: holders, whose projecting ends, which are directed downward,
extend into an overflow channel, are tightly attached externally
to the wall of the receiving tank; the overflow channel is guided
around the device at a level below the upper edge of the receiving
tank and is removably held by the holders; the overflow channel
tightly covers the tanks located beneath it having filtered coolant;
the inner edge of the overflow channel neighboring the receiving
tank lies at a higher level than the outer edge of the overflow
channel, which is further away from the receiving tank; and at least
one outlet device is provided in the bottom region of the overflow
channel.
2. The device according to claim 1 wherein the overflow channel
comprises a U-shape.
3. The device according to claim 1 or 2 wherein the outlet device
comprises a screen which is fixed on the edge of an opening in the
bottom of the overflow channel.
4. The device according to claim 3 wherein a cover is provided
over the screen which leaves the flow to the screen free and which
may be stepped on.
5. The device according to claim 4 wherein the maximum pass-through
volume flow of the outlet device may be smaller than or equal to
the maximum overflow volume flow.
6. The device according to claim 3 wherein the maximum pass-through
volume flow of the outlet device may be smaller than or equal to
the maximum overflow volume flow.
7. The device according to claim 3 wherein the filter properties
of the screen correspond to those of a filter cloth which is used
in the filter drum.
8. The device according to claim 7 wherein a cover is provided
over the screen which leaves the flow to the screen free and which
may be stepped on.
9. The device according to claim 8 wherein the maximum pass-through
volume flow of the outlet device may be smaller than or equal to
the maximum overflow volume flow.
10. The device according to claim 7 wherein the maximum pass-through
volume flow of the outlet device may be smaller than or equal to
the maximum overflow volume flow.
11. The device according to one of claim 1 or 2 wherein the maximum
pass-through volume flow of the outlet device may be smaller than
or equal to the maximum overflow volume flow.
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 with the transport element.
During the transport of chips and coolant, blockages of the transport
paths may not be completely prevented. In addition, the occurrence
of the chips and the coolant may be distributed greatly irregularly
over time. In turn, a backup of the coolant in the device and therefore
also a rise of the coolant may result from this, which may, in the
most unfavorable case, have an overflow of the unpurified coolant
over the upper edge of the receiving tank as a consequence. Such
an overflow may then reach regions which are to be kept clean and
containers containing coolant which has already been purified.
The object of the present invention is therefore, in case of such
an overflow, to prevent the contamination of regions to be kept
clean and of tanks containing coolant which has already been purified
and, in addition, to make the overflow situation visually recognizable
to the operating personnel.
This object is achieved by a device of the type initially described
according to the present invention in that holders, whose projecting
ends, which are directed downward, extend into an overflow channel,
are tightly attached externally to the wall of the receiving tank;
the overflow channel is guided around the device at a level below
the upper edge of the receiving tank and is removably held on the
holders, the overflow channel tightly covers tanks located beneath
it having filtered coolant, the inner edge of the overflow channel
neighboring the receiving tank lies at a higher level than outer
edge of the overflow channel, which is further away from the receiving
tank, and at least one outlet device is provided in the bottom region
of the overflow channel.
The overflow channel has a storage volume which may accommodate
overflowing contaminated coolant for some time. If this storage
volume is not sufficient, an overflow occurs at the outer edge of
the channel. The purified coolant located below the channel is protected
from recontamination.
According to a further suggestion of the present invention, the
overflow channel may be implemented as U-shaped.
According to a further suggestion of the present invention, the
outlet device may have a screen which is fixed on the edge of an
opening in the bottom of the overflow channel. The filter properties
of the screen expediently correspond to those of the filter cloth
which is used on the filter drum. In this way, it is ensured that
the coolant which passes through the outlet device into a container
having purified coolant is of the same degree of purity as the coolant
located there, i.e., contamination is avoided.
According to a further suggestion of the present invention, a cover
is provided over the screen which leaves the flow to the screen
free and which may be stepped on. Therefore, the overflow channel
is passable and the screen is protected from stresses which are
too high.
Finally, according to a further suggestion of the present invention,
the maximum pass-through volume flow of the outlet device(s) may
be smaller than or equal to the maximum overflow volume flow.
In the following, an embodiment of the device according to the
present invention is described with reference to the drawings.
FIG. 1: shows a side view of a device according to the present
invention having an overflow channel,
FIG. 2: shows a top view of the overflow channel shown in FIG.
1
FIG. 2a: shows a top view of the outlet device,
FIG. 2b: shows a section through the outlet device shown in FIG.
2a,
FIG. 3: shows a section along line A/A in FIG. 2 and
FIG. 4: shows a section along line B/B in FIG. 2.
FIG. 5: shows a detail view of the connection between receiving
tank and overflow channel.
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 hinged belt conveyor 5 guided on
both sides via rollers, is provided here as a transport element
for transporting away the chips present in the coolant. This conveyor
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 top view of the device is schematically illustrated in FIG.
2 an overflow channel 10 surrounding the entire device. Tanks 22
for receiving purified coolant may be located below overflow channel
10.
FIG. 2a shows an aspect of an outlet device 17 which is inserted
into an opening in overflow channel 10. Outlet device 17 includes
a retaining plate 19 to which screen 20 and cover 18 are attached.
In this case, the filter properties of screen 20 correspond to those
of the filter drum. If unfiltered coolant now passes over overflow
edge 2 into overflow channel 10 it will reach outlet device 17.
The coolant will then run off through screen 20 into tanks 22 located
below overflow channel 10 the chips still contained in the coolant
being held back by screen 20 so that only filtered coolant reaches
tanks 22 located underneath overflow channel 10. Cover 18 has a
recess on each of its sides, through which the unfiltered coolant
may flow to screen 20 and is used as a foot board.
FIG. 2b shows a section through outlet device 17. It includes retaining
plate 19 to the top of which cover 18 is attached. Screen 20 is
held on the bottom of retaining plate 19 with the aid of screen
attachment frame 21.
FIG. 3 shows a section through the device along line A-A, which
runs through rising guide section 3 of the device. In this section,
overflow of receiving tank 1 will not occur. Nonetheless, it has
been shown to be advantageous to lead overflow channel 10 around
the entire device.
FIG. 4 shows a section through the device along line B-B, which
runs through receiving tank 1. In this case, top edge 2 of receiving
container 1 is simultaneously the lowest edge of receiving tank
1. Therefore, if an overflow of coolant which is not yet been purified
occurs, it will occur in this region. Overflowing coolant will then
flow on the outside of receiving tank 1 and over the upside-down
U-shaped profile into overflow channel 10. Subsequently, it will
flow off into tank 22 via outlet device 17 chips contained therein
being held back by screen 20. For the case in which the quantity
of overflowing coolant is greater than that flowing off through
the outlet device, the coolant will first collect in overflow channel
10 and finally flow off over outer leg 16 of overflow channel 10
which has a lower height than inner leg 15 of overflow channel 10
so that in this way it is ensured that unfiltered coolant will not
reach tank 22 having filtered coolant in any case.
FIG. 5 shows a detailed view of the connection between receiving
tank 1 and overflow channel 10. Holders 12 are welded into the outer
wall of receiving tank 1. In the exemplary embodiment, the holders
are a upside-down U-shaped profile, whose one leg is welded onto
the outer wall of receiving tank 1 and whose outer leg 14 engages
in overflow channel 10. Receiving tank 1 is connected to overflow
channel 10 using a screw connection via the upside-down U-shaped
profile welded onto it. The overflow channel has an inner leg 15
facing the device and an outer leg 16 facing away from the device,
height x of the outer leg 16 being selected lower than height y
of inner leg 15. This has the consequence that when overflow channel
10 is filled, overflow occurs outward before the filling state possible
here is achieved on inner leg 15 of overflow channel 10. Therefore,
a seal is not necessary between outer leg 14 of upside-down U-shaped
profile 12 and inner leg 15 of U-shaped overflow channel 10.
LIST OF REFERENCE NUMBERS
1 receiving tank 2 overflow edge 3 guide section 4 discharge section
5 hinged belt conveyor 6 lower deflection element 7 upper deflection
element 8 - 9 - 10 overflow channel 11 - 12 upside-down U-profile
13 - 14 outer leg of upside-down U-profile 15 inner leg of overflow
channel 16 outer leg of overflow channel 17 outlet device 18 cover
19 retaining plate 20 screen 21 screen attachment frame 22 tank
for filtered coolant |