Abstrict
This invention relates to a filter cloth suspending apparatus in
which a filter cake is produced by pressing sewage and waste water
between filter cloths with filter plates, and the obtained cake
is discharged. In the apparatus, an upper edge of the filter cloth
(3) is supported on an upper supporting bar (13), on the other hand,
a lower edge of the filter cloth is formed in a concave shape, and
a suspending member (15) is connected to both corners (18, 20).
Thus, the contact of the lower edge of the filter cloth with the
upper supporting bar is prevented, and damage of the filter cloth
is prevented. Further, sagging of the lower edge of the filter cloth
is also prevented.
Claims
We claim:
1. In a filter press having plurality of vertically disposed filter
plates (3) supported in parallel between a a pair of horizontal
guide rails (2), means to shift the plates (3) to one of an open
and a closed position relative to each other along said guide rails,
a filter cloth (12) disposed between adjacent filter plates (3),
the filter cloth (12) having upper and lower edges and an intermediate
portion extending between said upper and lower edges, a drive wheel
(11) mounted above each of the filter plates (3) to upper ends of
the filter plates, a driving means (15) having first and second
ends and an intermediate portion extending between said first and
second ends, wherein the intermediate portion of the drive means
is wound around an upper half of the drive wheel (11), the filter
cloth (12) having its upper edge connected to the first end of the
driving means (15), a guide roll (14) connected to a lower end of
the filter plate, wherein the intermediate portion of the filter
cloth extends around a lower half of the guide roll, wherein the
lower edge of the filter cloth (12) is attached to the second end
of the driving means (15) and is positioned above the guide roll,
wherein the driving means (15) is adapted to raise and lower the
filter cloth (12),
wherein the improvement comprises a filter cloth suspending apparatus
comprising:
an upper supporting bar (13), the supporting bar (13) being attached
to the upper edge of the filter cloth (12), the first end of the
driving means (15) being connected to the supporting bar (13), the
filter cloth (12) having side edges connected to the lower edge
of the filter cloth, the lower edge of the filter cloth (12) being
cut out to form a central concave portion and lower corners at the
side edges, wherein the upper edge and the corners at the lower
edge of the filter cloth (12) are connected to the driving means;
a guide bar (26) attached to the filter plate (3) adjacent each
of the side edges of the filter cloth (12); and
a pair of tension rings (29), each said tension ring (29) freely
encircling a respective one of the guide bars (26), each of the
lower corners of the filter cloth (12) being secured to a respective
tension ring (29).
2. In a filter press having a longitudinal array of vertically
extending filter plates (3), a support frame (1,2) for longitudinally
shiftably supporting the filter plates (3) along a horizontal span
of the frame, a first drive means (5, 6, 7, 8) for longitudinally
shifting the filter plates (3) along the horizontal span of the
frame, wherein an adjacent pair of filter plates (3) achieve one
of an open and a closed position relative to each other, a pair
of filter cloth sheets (12) interposed between adjacent pairs of
the filter plates (3), each of the sheets (12) having an upper and
a lower edge guide means (14) for guiding part of a a said pair
of filter cloth sheets (12) in reversible directions, wherein the
improvement comprises a filter cloth suspending structure comprising;
a longitudinally extending shaft member (9) supported by the frame
above said filter plates;
second drive means (10) for rotating the shaft member (9);
a sprocket member (11) longitudinally slidably fitted on the shaft
member (9), the sprocket member (11) comprising a boss (11a) attached
to one face thereof, said boss defining a radially outer cylindrical
bearing surface extending coaxially about said shaft member;
suspension means (15, 17, 20, 26, 29) for suspending the sheets
of filter cloth (12) from the sprocket member (11), whereby the
upper and lower edges of the sheet of filter cloth (12) ascend and
descend as the shaft member (9) is rotated by the second drive means
(10) while the respective pair of adjacent filter plates (3) are
in the open position; and
support means (27, 28, 30) attached to one of the respective pair
of adjacent filter plates (3) for supporting the sprocket member
(11) with respect to the shaft member (9), the support means comprising
a channel member (27a) having an open top, a closed bottom, and
a pair of laterally spaced sides extending upwardly from said closed
bottom, the channel member further comprising a seat (28) on the
bottom thereof for bearing against the cylindrical bearing surface
of the boss (11a) of the sprocket member (11) and a pair of horizontal
guide pins (30) projecting inwardly from the respective said sides
of the channel member (27a) for freely bearing against the cylindrical
bearing surface of the boss (11a) held therebetween.
3. The filter press according to claim 2, wherein the lower edge
of the sheet of filter cloth (12) is cut out to form a central concave
portion;
a chain member (15) having first and second ends and an intermediate
portion extending between said first and second ends, wherein the
intermediate portion of the chain member is wound around an upper
portion of the sprocket member (11), the first end of the chain
member (15) being attached to the upper edge of the sheet of filter
cloth (12),
a pair of bag portions (18) formed one on each side of the central
concave portion; and
a pair of triangular suspending members (20) wherein each of bag
portions (18) receives one of said triangular suspending members,
and wherein one of said triangular suspending members is connected
to the second end of the chain member (15).
4. The filter press according to claim 2, further comprising a
pair of guide bar members (26), one each of the pair being attached
to each side edge of the one adjacent filter plate (3), and
a pair of ring members (29), each of the ring members (29) freely
encircling a respective one of the pair of guide bar members (26),
each of the ring members (29) being secured to a side of the lower
edge of the sheet of filter cloth (12).
Description TECHNICAL FIELD
The present invention relates to an improvement of a filter cloth
suspending apparatus in a filter press in which a filter cloth suspended
between filter plates is traveled and a filter cake produced between
the filter cloths is discharged.
BACKGROUND ART
As a filter cloth suspending apparatus in a filter press, an example
shown in FIG. 4 in Examined Patent Publication No. Sho.-55-18528
has conventionally been known. In the suspending apparatus, a pair
of filter cloths are provided between filter plates, upper edges
of the filter cloth are adhered to each other, an upper supporting
bar for the filter cloth is inserted to the adhesion portion, a
lower portion of the filter cloth is put around a guide roll and
then fixed to a lower s supporting bar. Further, the upper and lower
supporting bars are connected to the both ends of a driving chain
latched around a sprocket of a driven shaft, and filter cloths are
suspended on the upper and lower supporting bars. Further, bevel
gears provided for the driving shaft and the driven shaft are engaged
to each other to rotate so that the filter cloth is lifted by rotating
the driving shaft.
In another suspending apparatus for the filter cloth shown in FIGS.
1 and 3 in Unexamined Patent Publication No. Hei.-2-261508, a chain
wheel provided on an upper filter plate is slidably arranged on
a driving shaft, and a driving chain for the filter cloth is latched
around this chain wheel to suspend the cloth. Further, in another
suspending apparatus for the filter cloth shown in FIG. 2 in Examined
Patent Publication No. Sho.-58-45842, a lower portion of a suspended
filter cloth is secured to a wind-up roll, the filter cloth is lowered
by the wind-up roll, and the filter cloth is lifted with a drive
wheel.
However, in the suspending apparatus providing the supporting bar
on the filter cloth on the upper and lower sides thereof, as shown
in the above mentioned Examined Patent Publication No. Sho. 55-18528
and Unexamined Patent Publication No. Hei 2-261508, when the filter
cloth is drove to be traveled so as to discharge cakes produced
between the filter plates, the upper supporting bar is lowered,
and the lower supporting bar is lifted, and then, both of the upper
and lower supporting bars are crossed to each other. And, at this
crossing, the upper supporting bar is brought into contact with
the lower supporting bar, and the supporting bars are apt to be
bent, or the filter cloth is apt to be broken, by a clinging condition
of the cake to the filter cloth. It is necessary to widen or open
the space or distance between the filter plates to prevent this
interference. However, when the space is widened, the number of
the filter cloths per unit area is reduced, and consequently, the
filtration area of the apparatus is also reduced. Thus, in order
not to widen the space between the filter plates, strong and thin
supporting bars has conventionally been used. Nevertheless, it is
actually difficult to completely avoid the contact. Thus, one side
of the pair of cloths provided between the filter plates is regulated
by a guide roll, positioned under the filter plates, and adjacent
to the driving shaft or the driven shaft positioned above the filter
plates, and the filter cloths are inclined at widening the space
between the filter plates (hereinafter referred to as an opening
of the filter plates). Further, when the filter cloths are traveled,
a string-shaped driving means comes into contact with the filter
cloths to generate abrasion, thereby shortening a life for the filter
cloth. Since the drive wheel is put between bearings provided above
the filter plates, a frictional resistance is generated between
the bearing and the driving shaft at the opening of the filter plates,
which results in abrasion of the driving shaft and bearing. Additionally,
in the apparatus in which the filter cloth is wound, as shown in
the above-mentioned Examined Patent Publication No. Sho.-58-45642,
when the filter cloth is clogged, the diameter of the wind-up roll
is changed in the width direction thereof, and a wrinkle is apt
to be produced. This invention provides a filter cloth suspending
apparatus in which the contact of the filter cloth with the supporting
bar, or the damage and abrasion of the filter cloth or the like
is reduced, and an opening/closing resistance of the filter plate
is also reduced. In this case, the "opening" means widening
the space between the filter plates, and the "closing"
means closing the space between the filter plates.
DISCLOSURE OF INVENTION
The gist of this invention resides in that in a filter press wherein
a number of filter plates are arrayed in parallel on guide rails
in a manner that they can freely be opened or closed, a pair of
filter cloths are provided between these filter plates, an upper
edge of the filter cloth is connected to one end of a driving means,
which is wound around a drive wheel mounted above the filter plate,
a lower edge of the filter cloth put around a guide roll is connected
to the other end of the driving means in a manner that the filter
cloth can freely be lifted or lowered; an upper supporting bar is
provided on the upper edge of the filter cloth, a central lower
edge of the filter cloth is cut out to form a central concave portion
while leaving both side edges, and both edges of the upper supporting
bar and both corners of the filter cloth lower edge are connected
to the driving means respectively.
The connection of said filter cloth to a string-shaped driving
means will now be described in detail. It is preferable that a bag
portion is provided for the both corners of the filter cloth with
the central concave portion, a triangular suspending metal is inserted
into this bag portion, and the lower edge of the suspending metal
is connected to the driving means for the filter cloth. Further,
It is also preferable that bag portions are formed at the lower
edge and the left and right lower side edges of the filter cloth
with central concave portion, a string-shaped body is inserted into
these bag portions, both ends of the string-shaped body are secured
to the filter cloth respectively, and the driving means for the
filter cloth is connected to both lower corners of the filter cloth.
Further, when a guide rod is provided along said both side walls
of the filter cloth, and a tension ring is engaged with the guide
rod with a play, and then said both corners of the filter cloth
are secured to the tension ring, a zigzag movement of the driving
means for the filter cloth can be regulated.
Further, a supporting mechanism for the drive wheel around which
a string-shaped driving means was put will now be described in detail.
A drive wheel slidably provided on the driving shaft arranged above
the group of said filter plates is movably supported on a supporting
rod arranged above the filter plate, and a portion around which
the driving means for the drive wheel is wound is provided on a
side of opening direction of filter plate.
The filter cloth suspending apparatus according to this invention
is constructed in such a manner as described above. Thus, when the
filter cloth is traveled between the filter plates, the contact
of the upper supporting bar to the filter cloth does not occur at
the crossing of the upper supporting bar arranged above the filter
cloth and the lower edge of the filter cloth, whereby damage of
the filter cloth or supporting member for the filter cloth can be
removed. Further, the both corners of the filter cloth are engaged
with guide rods provided along the side walls, Thus, when the filter
cloth is traveled with the driving means, the filter cloth is regulated
by the guide rod, and the filter cloth is lifted, while maintaining
a regular distance to the guide rod. That is, the filter cloth suspending
apparatus according to this invention prevents an approach of the
driving means to inside, and a zigzag movement of the filter cloth.
As a result, the driving means is not intervened between the filter
plates at the opening of the filter plates. Furthermore, the filter
cloth is always maintained in a stretching state, sagging and a
wrinkle of the filter cloth can he prevented.
In the filter cloth suspending apparatus using triangular suspending
metal to connect the filter cloth to the driving means, an inclined
plane portion of the suspending metal which is drawn by the driving
means is pressed on the lower edge and side edge of the filter bag
portion, each cut out concave lower edge of the filter cloths is
drawn in the left and right inclination directions, and then an
action to draw both side edges of the filter cloths occurs in the
vertical direction, whereby the filter cloths can be tensioned.
Thus, since the triangular suspending metal is drawn while abutting
against the filter cloth, a high strength can be obtained at the
tensioned portion. Further, when a guide rod is provided along a
side wall of the filter cloth and the suspending metal is engaged
therewith, the filter cloth can be always kept in tension. In a
case where string shaped bodies are inserted into the lower edge
and the lower side edge, in place of the above-mentioned suspending
metal, when the filter cloth is drawn by the string-shaped body,
the central portion of the cut out lower edge to be sagged is tensioned
by the string-shaped body, thereby generating a component of force
in transverse and vertical directions. As a result, sagging of the
filter cloth is prevented and a wrinkle derived from the sagging
is not formed. Further, when this string-shaped body is engaged
with a guide rod, approaching inside of the driving means and zigzag
movement of the filter cloth can be prevented.
On the other hand, when the group of the filter plates are opened
from a closed state, the side wall around which the driving means
is hanged is traveled by pushing of a supporting rod to be shifted,
while a boss portion of the drive wheel is put on the supporting
rod provided above the filter plates, and the filter plates are
stopped in an opened state. That is, the upper portion of the filter
cloth suspended between opened filter plates is suspended by the
drive wheel arranged near the back side filter plate, and the lower
portion of the filter cloth is hung around a guide roll arranged
under the front side filter plate. Accordingly, the driving means
keeps a state of tension in a downward inclined direction. For this
reason, when driving of the filter cloth is started, a force is
acted in a downward inclined direction and the drive wheel is slid
on a driving shaft. After that, the drive wheel is stopped at a
position at which load of the filter cloth is decreased, between
the filter plates. And, when the filter plates are closed, closing
of the filter plates are started from the filter plate on the back
side in the opening direction. That is, the drive wheel is pushed
by a back side supporting rod, and closing of the filter plates
can be completed in a state where the boss portion of the drive
wheel is mounted on the supporting rod. At this time, although the
filter plates are slid on the guide rail to travel while being inclined
by the frictional resistance, the boss portion of the drive wheel
is mounted on the supporting rod only. Thus, the filter plates do
not interfere the movement of the drive wheel, and the drive wheel
and the filter plates are not damaged.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a schematic side view of a filter press according to
the present invention, and shows a state where filter plates are
opened on the left side, and a state where filter plates are closed
on the right side.
FIG. 2 is a front view showing a state where a filter cloth is
suspended on the front side of the filter plate, according to the
present invention.
FIG. 3 is a side view showing a state where a filter cloth is suspended
between the filter plates, according to the present invention.
FIG. 4 is a schematic front view showing a state where a filter
cloth is folded once, according to the present invention.
FIG. 5 is a front view of a suspending apparatus in which suspending
metals are provided for the lower edge of a filter cloth having
a concave portion, according to the present invention.
FIG. 6 is a front view of a suspending apparatus in which a string-shaped
body is provided for the lower edge of a filter cloth, according
to the present invention.
FIG. 7 is a partial sectional view showing a case where a drive
wheel is mounted on an upper bracket for a filter plate, according
to the present invention.
FIG. 8 is a front view showing a case where a drive wheel is mounted
on an upper bracket, according to the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
The best mode according to this invention will now be described
with reference to the drawings.
FIG. 1 is a schematic side view of a filter press according to
the present invention, and shows a state where filter plates are
opened on the left side, and a state where filter plates are closed
on the right side. Reference numeral 1 denotes a pair of frames,
and reference numeral 2 denotes a guide rail bridged between both
frames i and 1, which is bridged at both sides of the frames 1 and
1. Reference numeral 3 denotes a number of filter plates movably
arrayed in parallel, the filter plates can be traveled in the left
and right direction in FIG. 1. These filter plates 3 are supported
by means of filter plate arms 4 and 4 arranged at both upper side
walls. These the filter plates 3 are connected to each other by
means of chains 6 which control the space between the filter plates
to a required distance or less, and a movable head is connected
to one side of the filter plates group by means of chains 6 in the
same manner. Reference numeral 7 denotes a hydraulic cylinder supported
by a frame 1. A piston 8 of the cylinder is connected to the movable
head 5. When the piston 8 is advanced, the movable head 5 presses
the group of the filter plates 3 from the left side so as to sequentially
move them in the right direction. Thus, the group of the filter
plates 3 forms a state of closing the filter plates, as shown on
the right side in FIG. 1. On the contrary, when the group of the
filter plates 3 is closed, the piston 8 is backed. Then, the movable
head 5 sequentially draws the group of the filter plates 3, first,
the filter plate 3 on the left side being drawn. After that a state
of opening the filter plates is obtained as shown on the left side
in FIG. 1. Reference numeral 9 denotes a pair of driving shafts
supported at the both back portions of the frames 1 and 1. The driving
shafts 9 are rotated forward and backward by a forward and backward
motor 10. Reference numeral 11 denotes slide sprockets. Each slide
sprocket 11 is mounted on the driving shaft 9, as shown in FIGS.
3 and 7. This slide sprocket 11 is slidable in the axial direction
with respect to the driving shaft 9. However, relative rotation
of the slide sprocket 11 around the driving shaft 9 cannot be carried
out. In this example, a hexagonal driving shaft 9 is used.
A pair of filter cloths 12, 12 are provided between the above-mentioned
filter plates 3, 3 as shown in FIGS. 2 and 3. This pair of filter
cloths 12 and 12 are adhered to each other at the upper portions
thereof, and attached to an upper supporting bar 13. A hanged down
lower portion of the filter cloth 12 is put around a guide roll
14 arranged at the lower portion of the filter plate 3, and the
lower edge of the filter cloth is adhered to that of another filter
cloth 12 similarly arranged between the adjacent filter plates 3.
On the other hand, a driving chain 15 is latched with the above-mentioned
sprocket 11. One end of this driving chain is connected to the upper
supporting bar 13, and the other end is connected to the lower edge
of the filter cloth 12. And, when the driving shaft 9 is rotated,
the slide sprocket is rotated so that the upper and lower portions
of the filter cloth 12 are lifted or lowered as a seesaw. Further,
reference numeral 16 denotes a supply opening for stock solution,
provided for the filter cloth 12.
The suspended filter cloth described above will be described in
detail. As shown in FIG. 4, the filter cloth 12 is formed by folding
a rectangular filtration cloth. A mounting portion 17 of the upper
supporting bar 13 is formed in the folded upper edge. The lower
portion of the filter cloth 12 is cut out to form a central concave
portion while leaving both side edges. The end portions of the driving
chain 15 are attached to the both side edges of the upper supporting
bar 13 inserted into the mounting portion 17 and to both corners
of the lower edge of the filter cloth. Triangular bag portions 18
are respectively provided for the both lower edges of the filter
cloth 12, as shown in FIG. 5. The bag portion 18 is formed in a
bag-shape by sewing portions 19 and 19 formed in the lower edge
and the side edge. The tip of the bag portion 18 is cut out. A triangular
suspending metal 20 is inserted into the bag portion 18. The tip
of the suspending metal 20 is protruded out of the cut out portion
of the bag portion 18. The protruded tip of the supporting metal
20 is connected to the driving chain 15 with a connector 21. And,
the suspending metal 20 tensions the filter cloth 12 while being
supported by the sewing portions 19 and 19. The lower central edge
(point C) of the filter cloth, provided with a central concave portion
where sagging is apt to be formed, is tensioned in the left and
right inclined directions (C.fwdarw.A, C.fwdarw.B directions). Further,
the lower side edges of the filter cloth 12 are tensioned in longitudinal
directions (D.fwdarw.A, E.fwdarw.B directions).
A filter cloth suspending apparatus shown in FIG. 6 is another
example. In this example, a bag portion 22 is formed in a lower
edge of the filter cloth 12 having a cut out concave portion, and
bag portions 23 are formed in both lower side edges, both side tips
B and D of the lower edge of the filter cloth 12 being cut out.
And, a rope 24 is inserted into these bag portions 22 and 23. Both
ends of the rope 24 are secured to the filter cloth 12 at upper
portions (points A and E in FIG. 6) of the bag portions 23 and 23
arranged at the lower both side edges of the filter cloth 12, and
the central portion of the rope 24 is secured to the filter cloth
12 at the concave center thereof (point C in FIG. 8). The rope 24
is connected to the driving chain 15 with a connector 25 at both
cut out corners of the filter cloth (points B and D in FIG. 6).
And, when the rope 24 is drawn with the driving chains 15, it is
tensioned. Consequently, longitudinal directional (A.fwdarw.B) and
transverse directional (E.fwdarw.D) components of force are acted
at the rope 24 securing portions (points A and E) arranged at the
lower both side edges of the filter cloth 12. Therefore, when the
rope 24 is drawn at the both side corners (points B and D), the
filter cloth 12 is tensioned so as to prevent sagging and a wrinkle.
Further, the bag portions 22 and 23 providing a lower peripheral
portion of the filter 12 functions as not only a guide of the rope
24, but also a reinforcement of the edge of the filter cloth.
Reference numeral 28 is a guide bar arranged along both side wall
walls of the filter plate 3. As shown in FIG. 2, the guide bar 28
is supported by an upper bracket 27 vertically arranged at the upper
portion of the filter plate 3 and a lower bracket 14a, hanged down
to the lower edges of the filter plate 3, and providing the guide
roll 14. To the guide bar 28 is fitted with a play a tension ring
29, as shown in FIGS. 5 and 6. In a case where the suspending metal
20 are arranged at both lower edges of the filter cloth 12, the
tension ring 29 is engaged with this suspending metal 20. And, when
the filter cloth 12 is lifted or lowered with the driving chain
15, the driving chain 15, the suspending metal 20 and the connector
21 are regulated with the guide bar 26, so as to be lifted or lowered
along the guide bar 26. Accordingly, the filter cloth 12 is lifted
or lowered while maintaining a regular space or interval with respect
to the guide bar 26 so that the zigzag movement of the filter cloth
12 or the driving chain 15 is prevented. Further, when the driving
chain 15 is lifted or lowered between the filter plates 3 and 3,
the guide bar regulates a reaction force for sagging the driving
chain 15. Therefore, by providing the guide bar 26, a wrinkle of
the filter cloth 12, derived from sagging of the filter cloth 12,
can be prevented, and at the same time, the zigzag movement of the
filter cloth 12 or the driving chain 15 can be also prevented.
As shown in FIGS. 7 and 8, a concave supporting arm 27a is mounted
on the upper bracket 27 vertically provided on the filter plate
3. This supporting arm 27a supports the boss portion 11a of the
slide sprocket 11 with a seat 28. At the time of opening or closing
the group of the filter plates 3, the slide sprocket 11 fitted to
the driving shaft 9 can be freely moved upwardly or sideways with
the respect to the upper bracket 27 of the filter plate 3. At the
time of opening or closing the group of the filter plates, the filter
plate 3 inclines to travel with inclination by sliding resistance
between the guide rail 2 and the filter plate arm 4. Nevertheless,
as the slide sprocket 11 is not fixed to the upper bracket 27 of
the filter plate 3, it can be moved independently. Therefore, burning
which is derived from friction resistance between the driving shaft
9 and the slide sprocket 11, and damage of the slide sprocket 11
or the filter plate 3, which is derived from over load can be prevented.
A pair of guide pins 30 are horizontally secured to both side walls
of the supporting arm 27a of the upper bracket 27. These guide pins
30 are respectively arranged along the boss portion 11a of the slide
sprocket 11 in a manner that the ends of the guide pins 30 extend
from the respective supporting arm 27a. When the group of the filter
plates 3 is closed, the guide pin 30 is traveled while pressing
the side wall of the adjacent slide sprocket 11, so that movement
of the filter plate being inclined can be prevented. And, the slide
sprocket 11 is received in the upper bracket 27 of the filter plate
3 adjacent thereto in a closing direction, and at the same time,
the filter cloth 12 is traveled to the intermediate position between
the filter plates 3 and 3 with the guide pin 30, and catching of
the filter cloth on the filter plate can be prevented at the start
of lifting or lowering of the filter cloth. And, when the space
or distance between the filter plates 3 and 3 is increased, namely
the filter plates are opened, and the filter cloth is lifted or
lowered, then, the slide sprocket 11 is tensioned with the driving
chain 15 and moved to a position between the filter plates 3 and
3, where load is minimum, so that the filter cloth 12 can be lifted
or lowered.
Since the apparatus of this invention is constructed as mentioned
above, the filter cloth 12 does not come into contact with other
elements when the upper portions of the filter cloths are crossed,
and the filter cloth 12 to be sagged can be tensioned. Further,
the drive wheel for lifting or lowering of the filter cloth 12 do
not become resistance to the opening or closing of the filter plate
and the traveling of the filter cloth 12. That is, in a conventional
apparatus, when the filter cloth is lifted or lowered, the upper
supporting bar is brought into contact with the lower supporting
bar at the crossing thereof, whereby the filter cloth or the suspending
apparatus is apt to be damaged. However, according to the present
invention, a lower central edge and both side edges of the filter
cloth, which are portions most likely to sag, are tensioned in an
inclined direction and a longitudinal direction respectively, to
tension the filter cloth. Accordingly, a wrinkle of the filter cloth
and contact of the filter cloth with others at the crossing of the
upper and lower portions of the filter cloths do not occur. Further,
distance between opened plates can be reduced, and the traveling
speed of the filter cloth can be increased. And, in a conventional
apparatus, since a driving wheel meshed with a driving shaft is
fixed to the upper portion of the filter plate, the drive wheel
acts as resistance of the opening and closing of the filter plates.
However, according to this invention, zigzag movements of the filter
cloth and driving chain can be regulated by guide rods arranged
along both sides of the filter plate. As a result, a wrinkle of
the filter cloth and catching of the driving chain between the filter
plates can be prevented. And, since the drive wheel is free with
respect to the filter plate, a driving chain wound drive wheel can
freely be slid on a driving shaft, at the opening or closing of
the filter plates. Thus, resistance is not generated at the time.
Further, at the lifting or lowering of the filter cloth, the drive
wheel is slid in a direction where a load is small, whereby a load
which is generated at the lifting or lowering of the filter cloth,
can be reduced.
INDUSTRIAL APPLICABILITY
As described above, the filter suspending apparatus according to
the present invention is suitable for a suspending apparatus which
is used for a filter press. The filter press is used for the sewage
treatment and the industrial waste water treatment or the like. |