Liquid purification or separation – With repair or assembling means – Hoist or handle means
Reexamination Certificate
1999-02-12
2001-07-10
Reifsnyder, David A. (Department: 1723)
Liquid purification or separation
With repair or assembling means
Hoist or handle means
C210S167150, C210S232000, C210S402000, C210S497100, C210S497010, C210S499000, C029S896620
Reexamination Certificate
active
06258267
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a filtering apparatus and, more particularly, to a filtering apparatus in which a filter, which is wound on a filtration drum rotatably driven in order to filter and separate a liquid and solids mixedly contained in soil water after the water is used in, e.g., various types of industrial machines so that the liquid or solids can be recycled, is made exchangeable.
Conventionally, many filtering apparatuses are proposed that separate cutting oil, which contains chips after being used for metal machining, into chips and cutting oil, thus obtaining recyclable cutting oil (to be referred to as purified cutting oil hereinafter).
In such a filtering apparatus, a filter is detachably wound on opening portions formed in the outer circumferential surface of a filtration drum which is rotatably driven. The filter is exchanged when a predetermined period of operation time lapses or it is broken.
Description will be made with reference to the accompanying drawings.
FIG. 5
is an outer appearance perspective view showing how to exchange a filter.
Referring to
FIG. 5
, a plurality of opening portions
202
are formed in the outer circumferential surface of a filtration drum
201
which is supported to rotate about a main shaft
204
. Stud bolts
205
are welded at a constant interval on the filtration drum
201
in the radial direction in order to wind and fix a filter
220
on the opening portions
202
.
Mounting hole portions
220
c
are formed in the filter
220
at portions where the stud bolts
205
on the filtration drum
201
sides are inserted, and the filter
220
has a filter portion
220
b
having a predetermined mesh size. In order to wind and fix the filter
220
having the above arrangement on the filtration drum
201
, the mounting hole portions
220
c
are respectively fitted on the stud bolts
205
, and the entire filter
220
is wound on the filtration drum
201
. Thereafter, metal fixtures
221
which are bent in advance to match the arc of the outer circumference of the filtration drum
201
are placed on the filtration drum
201
such that their through hole portions
221
b
formed at a pitch corresponding to the pitch of the stud bolts
205
are set as shown in FIG.
5
. Finally, nuts
31
are threadably engaged and fixed on the stud bolts
205
.
In the above manner, the filter
220
is fixed near the edge portions of the outer circumferential surface of the filtration drum
201
. As a result, the filter wound on the filtration drum
201
is prevented from moving toward the center in the thrust direction of the rotating shaft of filtration drum
201
, and the filter
220
is held in liquid-tightness.
As described above, fixing of the filter
220
requires at least four different works:
(a) To fit the mounting hole portions
220
c
on all of the respective stud bolts
205
;
(b) To wind the entire portion of the filter
220
;
(c) To set the large number of metal fixtures
221
; and
(d) To threadably engage and fix the nuts
31
with the respective stud bolts
205
. The total time of the filter exchange work after the filtration drum is removed from the filtering apparatus is about 30 minutes when it is done by a person skilled in the art.
If the filter exchange work requires much time in this manner, the down time of the entire portion of other machine facilities where the filtering apparatus is arranged suffers directly. Therefore, a maximum possible reduction in the filter exchange time is sought.
Since a large number of stud bolts must be arranged in the radial direction standing upright on the filtration drum, an increase in cost is inevitable. Similarly, it is not preferable to form a large number of mounting hole portions in the filter which is an expendable supply. It is difficult to bend the metal fixtures
221
into an arc that matches the arc of the outer circumference of the filtration drum. However, if the metal fixtures
221
are not bent appropriately, a gap may form on the filter mounting surface, and liquid-tightness cannot be maintained. Since the filter is mounted such that no force is generated at all in the thrust direction of the rotating shaft of the filtration drum, the filter may sometimes loosen in the thrust direction of the rotating shaft.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above respects, and has as its object to provide a filtering apparatus in which the time required for exchanging the filter can be shortened greatly, a reduction in cost in the manufacture of the filter as an expendable supply and a filtration drum can be realized, liquid-tightness can be maintained by preventing formation of a gap on the filter mounting surface, and the filter can be prevented from loosening in the thrust direction of the rotating shaft.
In order to solve the above problems and to achieve the above objects, according to the present invention, there is provided a filtering apparatus constituted by detachably winding a filter, which filters soil water used in an industrial machine into solids and a liquid, on opening portions formed in an outer circumferential surface of a filtration drum which is rotatably driven, the filtering apparatus comprising annular mounting portions respectively formed near edge portions of the outer circumferential surface, to have portions which prevent the wound filter from moving toward a center in a thrust direction of a rotating shaft of the filtration drum and which maintain the filter liquid-tight, and fastening means for firmly fixing the filter on the annular mounting portions and rendering the filter detachable.
The present invention is not limited to the embodiment to be described later. It is a matter of course that various changes and modifications may be made within the scope defined by the claims.
Other features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof.
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patent: 9-075622 (1997-03-01), None
Kabushiki Kaisha SYST
Merchant & Gould P.C.
Reifsnyder David A.
LandOfFree
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