JP2014094320A - Drainage guide structure for filter press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage guide structure capable of simply and easily draining to a side groove by providing filter cloth with a drainage function.SOLUTION: Filter clothes 5 cover a filter plate 6 on both of front and rear surfaces thereof. On a bottom part of each the filter clothes 5 below the lower edge of the filter plate 6, waterproof cloths 24 are continuously formed. The waterproof cloths 24 are so configured that one side edge thereof is longer than the other side edge so that an inclination shape is formed at bottom side edge thereof and a projecting edge 23 is formed along with the bottom side edge. On the other hand, in the filter clothes 5 covering a surface of each of the filter plates 6 which are fixed on their back side to a fixed board 12 and a movable board 14 respectively, on bottom part below the lower edge of the filter plate 6 and the lower edge of the fixed board 12 and the movable board 14, the waterproof cloths 24 are respectively arranged. The waterproof cloths 24 are so configured that one side edge thereof is longer than the other side edge so that inclination shape is formed at bottom side edge thereof and the projecting edge 23 is formed along with the bottom side edge. A cylinder 25 comprises one slit 25a which has the same length with the projecting edge 23 and being made on over the sidewall of the cylinder 25 entirely in a longitudinal direction. The projecting edge 23 of each of the waterproof clothes 24 is inserted into the slit 25a and held in the cylinder 25 so as not to be left out. The bottom side edge of the waterproof clothes 24 are bound to form a drainage guide path 26.

Description

  The present invention relates to a drainage guide structure in a filter press in which a filter cloth is mainly provided with a drainage function for allowing drainage generated during filtration and washing of the filter press to flow down to a side groove.

Conventionally, wastewater such as filtrate and washing water generated in the filtration process and washing process of the filter press flows down on the pair of left and right filtrate saucers inclined in a mountain shape below the filter press during the process. It is discharged to the outside through a side groove provided downstream (for example, Patent Document 1).
The filter plate tray is provided on each of the left and right side edges below the filter press so as to be able to swing up and down. As described above, when draining filtrate or the like, it closes in a mountain shape and guides the drainage to flow into the side groove. At the time of discharging the soot, it is opened by swinging downward, and the filter cake is dropped on the conveyor disposed below and transferred.

Japanese Patent Laid-Open No. 5-15708

Since the filter plate tray is configured to receive all of the drainage from the filter press, the entire plate must be large, and must be configured to swing up and down as described above. Was necessary and the installation was large and troublesome.
Therefore, an object of the present invention is to provide a drainage guide structure in a filter press in which a filter cloth is mainly provided with a drainage function and can be easily drained into a side groove.

In view of the above problems, the drainage guide structure in the filter press according to the present invention has a lower side edge that is longer than the one side edge at the lower part of the filter cloth that is attached to the front and back surfaces of the filter plate. The waterproof cloth having a protruding edge is continuously formed along the lower side edge, and each protruding edge of each waterproof cloth has the same length as this and a single slit extends over the entire length of the side wall. The drainage guide path is formed by binding the lower side edge of the waterproof cloth by holding it through the slit in the cylinder bored in this manner.
Further, in the filter cloth that adheres to the surface of each filter plate whose back surface is fixed to the fixed plate and the movable plate of the filter press, the lower side of the filter plate and the lower end of the fixed plate and the movable plate are on one side. The other side edge is longer than the edge and the lower side edge is inclined, and a waterproof cloth having a protruding edge is provided along the lower edge, respectively, and the protruding edge of the adjacent waterproof cloth has the same length and one strip The drainage guide path is formed by binding the lower edge of the waterproof cloth by holding the slit through the slit in a cylindrical body drilled over the entire length of the side wall.
The waterproof cloth to be attached to the lower ends of the fixed platen and the movable platen is provided with a protruding edge by horizontally forming the upper edge of the waterproof cloth, and the protruding edge is formed by piercing a slit longer than the entire length in the longitudinal direction of the side wall. The cylindrical waterproof cloth pendant is provided with a slit through the slit, and both ends of the waterproof cloth pendant are horizontally mounted on hook receivers suspended at both ends of the fixed plate and the movable plate in the width direction.

In short, in the present invention, in each filter cloth to be attached to the front and back surfaces of the filter plate, the lower side edge is longer than the one side edge at the lower part from the lower end of the filter plate and the lower side edge is inclined, and the lower side edge A waterproof cloth having a protruding edge is continuously formed along each of the waterproof cloths, and the protruding edge of each waterproof cloth is the same length as this, and a slit is secured through the slit in the longitudinal direction of the side wall through the slit. By holding, the drainage guide path is formed by binding the lower edge of the waterproof cloth, so that the filtrate and washing discharged from the filtrate outflow holes of the filter plate in the filtration process in the closed state of the filter press and the washing process of the filter cloth, etc. The drainage is received in a drainage guideway inclined to one side below the filter plate, flows down along the inclination, and drains into a gutter disposed at the tip.
Therefore, according to the present invention, drainage generated from the filter press can be easily and easily discharged to the external side groove without requiring a conventional filter plate tray.
Moreover, since each drainage guide path is arranged independently for each filter plate lower part, when the filter press is opened, the lower space between the filter plates is not obstructed, and the filter cake is discharged by the opened plate. There will be no hindrance.

  Further, in the filter cloth that adheres to the surface of each filter plate whose back surface is fixed to the fixed plate and the movable plate of the filter press, the lower side of the filter plate and the lower end of the fixed plate and the movable plate are on one side. The other side edge is longer than the edge and the lower side edge is inclined, and a waterproof cloth having a protruding edge is provided along the lower edge, respectively, and the protruding edge of the adjacent waterproof cloth has the same length and one strip By holding the slit through the slit in the cylinder bored across the longitudinal direction of the side wall, the drainage guide path is formed by binding the lower edge of the waterproof cloth to the filter plate at the front and rear ends of the filter press. It is possible to achieve the same effect as described above.

  The waterproof cloth to be attached to the lower ends of the fixed plate and the movable plate is provided with a protruding edge by horizontally forming the upper edge thereof, and the protruding edge is formed by piercing a slit longer than the entire length in the longitudinal direction of the side wall. Since the cylindrical waterproof cloth pendant is secured by passing through the slits, both ends of the waterproof cloth pendant are horizontally mounted on the saddle holders suspended at both ends of the fixed plate and movable plate in the width direction. Waterproof cloth can be easily and easily arranged at the lower end, and drainage guides with the same configuration as the filter plate with filter cloth attached to the front and back can be provided on the front and back filter plates. The effect is great.

It is a center longitudinal cross-sectional view of the filter press at the time of closing. FIG. 2 is an enlarged view of the upper part of FIG. 1. It is a lower enlarged view of FIG. It is a front view of the filter board which adhered the filter cloth. It is a principal part enlarged view of FIG. It is a principal part expansion perspective view which shows the filter cloth upper side edge before a connection. It is a principal part expansion perspective view which shows the connection state of a filter cloth upper side edge. It is a principal part expansion perspective view which shows the waterproof cloth lower side edge before a connection. It is a principal part expansion perspective view which shows the connection state of a waterproof cloth lower side edge. It is a center longitudinal cross-sectional view of the filter press at the time of stock solution injection. It is a center longitudinal cross-sectional view of the filter press at the time of filter cake discharge | emission. FIG. 12 is an enlarged view of the upper part of FIG. FIG. 12 is an enlarged view of the lower part of FIG.

An embodiment of the present invention will be described below with reference to the drawings.
The filter press 1 shown in the figure includes a plurality of square filter plates 6 each having a filter cloth 5 attached to a formation surface of a recess 3 surrounded by a filter frame 2 protruding in a frame shape via a draining net plate 4. A plurality of adjacently arranged filter chambers 7 are arranged in parallel with each other so that the filter chambers 7 are constituted by the concave portions 3 facing each other by the abutting between the adjacent filter plates 6, and the adjacent filter chambers 7 are connected to each filter plate 6 and the filter cloth 5. The stock solution (slurry) supply holes 8 and 8a are provided in communication with each other, and the filtrate outflow holes 9 are provided in the lower frame portion 2b of the filter frame 2 fixed to each filter plate 6 to communicate the inside and outside of the filtration chamber 7. .

  Each filter plate 6 is suspended between the rails 11 by placing a roller provided at the lower end of the support arm 10 projecting outwardly above the left and right side ends of the filter plate 6 on the rails 11 arranged in parallel to the left and right. ing.

  Between the front ends of the rails 11, there is installed a stationary platen 12 that fixes the back (front) surface of the frontmost filter plate 6, and between the rear ends of the rails 11, a pressure cylinder 13 (in the illustrated example, the rod Only the tip is shown.) The back (rear) surface of the last filter plate 6 is fixed to the tip of the rod of the pressure cylinder 13, and the rod 11 of the pressure cylinder 13 is expanded and contracted to the rail 11. A movable plate 14 that can be moved back and forth is disposed along the left and right ends of adjacent filter plates 6 connected by a chain (not shown) so as to follow a movable plate 14 that retreats in a closed plate state to be described later. Yes.

  Then, when the movable platen 14 is moved forward by the pressure cylinder 13, the adjacent filter plates 6 are brought into a closed plate state, and the movable plate 14 is moved backward by the pressure cylinder 13 from the closed plate state. The open plate state in which the six members are separated from each other is formed.

  In addition, when the filter press 1 is in a closed plate state, a stock solution supply pump P for press-fitting a stock solution (slurry) S into each filtration chamber 7 is opened in the stationary platen 12 and a stock solution supply hole 8 of the frontmost filter plate 6. Is connected to a raw fluid pressure inlet 12a communicated with.

The filter press 1 is equipped with a filter cloth cleaning device.
This filter cloth cleaning device is passed through the upper frame portion 2a of each filter frame 2 along with the filter cloth 5 and the filter plate 6 in the thickness direction, and communicates in a watertight manner in the contact state of each filter plate 6 to wash water. A cleaning water channel 15 capable of supplying cleaning water from the supply pump P1 and a cleaning water jet port 16 branched from the cleaning water channel 15 in the longitudinal direction of the upper frame portion 2a and communicating with the filtration chamber 7 are provided. Yes.

  A plurality of washing water channels 15 (three in the illustrated example) are arranged side by side and are opened in the fixed platen 12 and branch to each of the washing water pressure inlets 12b communicating with the respective washing water channels 15 of the frontmost filter plate 6. It is connected to one washing water supply pump P1 through a pipe.

  The upper frame portion 2a is provided with a transverse water channel 15b vertically passing through a short water channel 15a that hangs down and communicates with each washing water channel 15 and corresponding to the lateral width of the concave portion 3 continuously joining the lower ends of the water channels 15a. The lateral water channel 15b is perforated with an inclined water channel 15c directed to the lower recess 3 at a predetermined interval in the length direction of the lateral water channel 15b, and the flush water outlet 16 serving as the end of the inclined water channel 15c. Is established on the inner slope of the upper frame 2a.

Next, a drainage guide structure that allows the filtrate and washing wastewater generated during filtration and washing of the filter press 1 to flow down to the side groove D installed on one side of the filter press 1 will be described.
This drainage guide structure can be achieved mainly by providing the filter cloth 5 with a drainage function.

  The filter cloth 5 is formed to have substantially the same width as the filter plate 6, has a length from the upper side to the lower side of the filter plate 6, and has a through hole having substantially the same diameter as the corresponding portion with the stock solution supply hole 8. The filter cloth suspension device 17 is suspended from above the filter plate 6 so as to be attached to the concave molding surface 3 from above the draining screen plate 4.

  The filter cloth suspending device 17 has a filter cloth suspending arm 18 projecting outwardly at the upper part of the left and right side ends of the filter plate 6, and a semicircular arc shape having a bifurcated tip at the front and rear of the filter cloth suspending arm 18. A guide bar 19 provided with an upper end of the hook receiving 19a is erected, and a filter cloth hanging rod 20 fitted with the upper edge of the filter cloth 5 is horizontally placed between the upper ends 19a of the guide bar 19. ing.

In this embodiment, the filter cloth 5 used for the filter plate 6 having the recesses 3 on the front and back surfaces is provided with the respective filter cloths 5a and 5b to be attached to the front and back surfaces of the filter plate 6, respectively. Are employed that are substantially H-shaped in cross-section (hereinafter referred to as H-shaped filter cloths (5a, 5b)).
In addition, one square filter cloth 5c (hereinafter referred to as a single-leaf filter cloth 5c) is used for the front and rear filter plates 6 in which the recess 3 is formed only on one side.

  The H-type filter cloth (5a, 5b) is attached by attaching one filter cloth 5a to one recess-forming surface 3 of the filter plate 6 and temporarily shrinking the other filter cloth 5b. After passing through the supply hole 8, the supply hole 8 is expanded and returned to the other recess forming surface 3.

As a result, the stock solution supply hole 8a of each filter cloth 5a, 5b can be positioned in the stock solution supply hole 8 of the filter plate 6, and the stock solution supply hole 8a of the single-leaf filter cloth 5c is positioned and fixed to the stock solution supply hole 8 of each recess forming surface 3. In order to achieve this, a tube flange-like filter cloth retaining ring 21 is used, that is, for each single-leaf filter cloth 5c, the tube portion 21a of the filter cloth retaining ring 21 is passed through the stock solution supply hole 8a, and the stock solution supply hole 8a of the filter cloth 5c. The troublesome work of inserting the tube portion 21a into the insertion supply hole 8 is avoided by sandwiching the peripheral portion between the flange portion 21b and the peripheral portion of the insertion supply hole 8 of each recess forming surface 3. .
In addition, since the stock solution supply hole 8 is not formed in the last filter plate 6, the stock solution supply hole 8a is not formed also in the single leaf type filter cloth 5c which adheres this.

  In this embodiment, the H-shaped filter cloth (5a, 5b) and the single-leaf filter cloth 5c are used as the filter cloth 5. However, the single-wafer filter cloth 5c is covered on each recess forming surface 3 of all the filter plates 6. In this case, a filter cloth retaining ring 21 is used for each recess forming surface 3 to which the single-leaf filter cloth 5c is to be attached.

  In any type of filter cloth 5, an outward protruding edge 22 is provided on each upper edge of the filter cloth horizontally disposed above the upper end of the filter plate 6.

The protruding edge 22 is sewn by folding the upper edge of the filter cloth 5 outward.
Each of the pair of protruding edges 22a and 22b of the H-type filter cloth (5a, 5b) and the protruding edge 22c of the single-leaf filter cloth 5c is in a cylindrical shape longer than each of the protruding edges 22 (22a, 22b, 22c). The filter cloth pendant basket 20 is held in the filter cloth hanging bar 20 so that both ends of the filter cloth pendant bar 20 are laid horizontally between the bar holders 19a of the filter cloth hanging device 17 and the H-shaped filter cloth (5a, 5b ) And the single-leaf filter cloth 5c.

  The filter cloth pendant 20 is made of plastic, preferably polypropylene, and is made of a pipe having a circular cross section that is longer than the width of the filter cloth 6 and open at both ends. A single slit 20a is formed from one end to the other end of 20 to form a C-shaped cross section.

In the filter cloth pendant 20, the slits 20a for the H-shaped filter cloth (5a, 5b) can be inserted through the upper edges of the H-shaped filter cloth (5a, 5b) (corresponding to the thickness of two filter cloths 5). In addition, the width is set such that the protruding edges 22a and 22b are hooked and cannot be inserted.
Further, in the filter cloth hanging rod 20, the slit 20a for the single-leaf filter cloth 5c allows the upper edge (corresponding to the thickness of one sheet of the filter cloth 5) to be inserted, and the protruding edge 22c is hooked and inserted. The width cannot be set.

  Then, by sliding the base of the protruding edge 22a, 22b of the H-shaped filter cloth (5a, 5b) or the protruding edge 22c of the single-leaf filter cloth from the one end opening side of the filter cloth hanging pad 20 into the slit 20a, Each protruding edge 22 is retained in the filter cloth pendant 20 through the slit 20a (see FIGS. 6 and 7).

In each of the filter cloths 5a and 5b of the H-type filter cloth (5a and 5b), the lower side edge is longer than the one side edge and the lower side edge is inclined at the lower part from the lower end of the filter plate 6. The waterproof cloths 24 having left and right symmetrical shapes having outward protruding edges 23 are continuously formed.
Further, in the single-leaf filter cloth 5c, the lower part of the lower part of the filter plate 6 and the lower parts of the fixed platen 12 and the movable platen 14 are formed such that the other side edge is longer than one side edge and the lower side edge is inclined. A waterproof cloth 24 having an outward protruding edge 23 along the side edge is provided for each.

Each protruding edge 23 of the adjacent waterproof cloth 24 is formed by folding the bottom edge of the waterproof cloth 24 outward and sewing, and has a slit 25a having the same length as the protruding edge 23 and extending across the entire longitudinal direction of the side wall. The drainage guide path 26 is formed by binding the lower edge of the waterproof cloth 24 by holding the cylindrical body 25 through the slit 25a.
The cylindrical body 25 is made of the same material as the filter cloth pendant 20, and the structure thereof is basically the same. The retaining of each protruding edge 23 with respect to the cylindrical body 25 is also similar to the above. The base of each protrusion 23 of the waterproof cloth 24 can be slid from one end opening side of the cylinder 25 into the slit 25a (see FIGS. 8 and 9).

The waterproof cloth 24 attached to the lower ends of the fixed platen 12 and the movable platen 14 has an upper edge formed horizontally and provided with an outward protruding edge 23a. The protruding edge 23a is formed by folding the upper edge of the waterproof cloth 24 outward. Sewing.
Further, the projecting edge 23a holds the cylindrical waterproof cloth hanging rod 27 formed with a slit 27a longer than the slit in the longitudinal direction of the side wall through the slit 27a. Both ends of the fixed plate 12 and the movable plate 14 are horizontally mounted on a J-shaped hook-shaped hook receiver 28 that is suspended from both ends in the width direction.

  The waterproof cloth hanging rod 27 is made of the same material as the filter cloth hanging rod 20 and the cylindrical body 25, and the structure thereof is basically the same. The waterproof cloth hanging rod 27 has a protruding edge 23a on the upper side of the waterproof cloth 24. In the same way as described above, the retaining can be performed by sliding the base of the protruding edge 23a of the waterproof cloth 24 from the one end opening side of the waterproof cloth hanging rod 27 into the slit 27a.

  The waterproof cloth 24 may be made of the same material as the filter cloth 5 so that the lower part of the filter cloth 5 is formed to extend in the above-mentioned shape, and a waterproof paint is applied to the lower part to provide waterproofness. However, it is preferable that a synthetic resin sheet such as a polyethylene sheet having a waterproof property is formed in the above-described shape and integrated with the lower end of the filter cloth 5 or attached to the lower ends of the fixed platen 12 and the movable platen 14.

  In the filter press 1 having the above-described configuration, the movable platen 14 is pushed up by the operation of the pressurizing cylinder 13, the opposing concave portions 3 are brought into contact with each other, and the plate is closed and filtered between adjacent filter plates 6. The chamber 7 is configured.

Then, by the operation of the stock solution supply pump P, the stock solution S is pumped between the filter cloths 5 in each filtration chamber 7 from the stock solution pressure inlet 12a and filtered.
As a result, the stock solution S is separated into solid and liquid, the solid content remains in the filtration chamber 7 as filter cake C, and the filtrate flows down from the filtrate outflow hole 9 into the drainage guide passage 26 outside the filtration chamber 7. Is discharged to the side groove D arranged downstream thereof.

  After filtration, the movable platen 14 is moved backward by the pressurizing cylinder 13 so that the filter plates 6 connected by the respective chains are moved back and forth sequentially, and the filter plates 6 that have been in the pressure contact state are separated from each other to be filtered. Is formed in the open plate state separated into the recess 3, and the filter cake C in the filtration chamber 7 is dropped onto a conveyor (not shown) provided at the lower part of the filter press 1 and conveyed to the next treatment place.

  In such an open plate state, each drainage guide path 26 is arranged independently for each lower portion of each filter plate 6, so that the filter cake C falls on the conveyor without blocking any lower space between the filter plates 6. Be made.

Next, the movable platen 14 is pushed by the pressurizing cylinder 13 so as to be in a closed plate state, the washing water channel 15 of each filter plate 6 is made continuous, and the filter cloth 6 is moved to the washing step.
In this cleaning step, the cleaning water is pumped into the series of cleaning water channels 15 from the cleaning water pressure inlet 12a by the operation of the cleaning water supply pump P1.

Then, the wash water in the wash water channel 15 is jetted to the back surface of the filter cloth 6 from the wash water outlet 16 which is the end of the slant water channel 15c through the flood water channel 15a, the Yokote water channel 15b, and the inclined water channel 15c. Wash.
This cleaning of the filter cloth 6 is an effective backwashing for removing the clogged residue in the filter cloth 6. This backwashing is in a closed plate state, that is, each filter on the adjacent filter plate 6 around the filter cloth 6. Since the filter cloth 6 is sandwiched between the frames 2, the filter cloth 6 is not swelled and damaged by the pressure of the washing water, and the surface of the filter plate 6 and the drained screen board 4 can be washed at the same time. There is no scattering.

  The washing drainage generated by the filter cloth washing flows down from the filtrate outflow hole 9 into the drainage guide path 26 outside the filtration chamber 7 in the same manner as the filtration, and along the slope of the drainage guide path 26, the drainage guide path 26. It is discharged to the side groove D arranged downstream.

  After this, if the stock solution supply pump P is operated in a state where the closed plate is maintained, the process can continue to the filtration step.

1 Filter press 5 Filter cloth 6 Filter plate
12 Fixed platen
14 Movable platen
23 ridge
23a ridge
24 waterproof cloth
25 cylinder
25a slit
26 Drainage guideway
27 Waterproof cloth
27a slit
28

Claims (3)

  In each filter cloth to be attached to the front and back surfaces of the filter plate, the lower side of the lower part of the filter plate is longer than the one side edge, the lower side edge is inclined and the lower side edge is inclined, and the protruding edge along the lower side edge Each of the waterproof fabrics is continuously formed, and the protruding edge of each waterproof fabric is the same length as this, and a single slit is held in the cylinder body drilled over the entire longitudinal direction of the side wall through the slit, A drainage guide structure in a filter press, wherein a drainage guide path is formed by binding the lower edge of a waterproof cloth.   In the filter cloth that adheres to the surface of each filter plate whose back surface is fixed to the fixed plate and the movable plate of the filter press, the lower part from the lower end of the filter plate, and the lower end of the fixed plate and the movable plate, from one side edge The other side edge is long and the lower side edge is inclined, and a waterproof cloth having a protruding edge is provided along the lower side edge, and the protruding edge of the adjacent waterproof cloth has the same length as this and has a single slit. A drainage guide structure in a filter press, characterized in that a drainage guide path is formed by binding a lower edge of a waterproof cloth by retaining and retaining through a slit in a cylindrical body drilled over the entire lengthwise direction of the side wall.   The waterproof cloth to be attached to the lower ends of the fixed plate and the movable plate is provided with a protruding edge by horizontally forming the upper edge thereof, and the protruding edge is formed by piercing a slit longer than the entire length in the longitudinal direction of the side wall. 3. A cylindrical waterproof cloth pendant is secured by passing through a slit, and both ends of the waterproof cloth pendant are horizontally mounted on a saddle receiver vertically suspended at both ends of the fixed plate and the movable plate in the width direction. The drainage guide structure in the described filter press.

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