JPH03224604A - Compression filter plate in compression-type filter press - Google Patents

Abstract

PURPOSE:To prevent the cracking of a diaphragm by connecting pillars with a large-sized connecting plate to form a projecting piece and connecting the piece to the diaphragm by the pillar. CONSTITUTION:A raw liq. is supplied between a couple of filter cloths 8 and 8 inserted between filter plates 2 and 4 from the raw liq. feed pipe 27 of a stand 14 through the raw liq. feed ports 3K and 4K of the filter plates 2 and 4. When a specified amt. of the raw liq. is supplied, compressed air is supplied to the compression filter plate 2 from a feed pipe 29 through a compression fluid supply passage, and each diaphragm 1 is expanded. The filtrate discharged by the filtration is recovered in a filtrate recovery passage and discharged from a filtrate recovery pipe 28. Since the diaphragm 1 is fixed to the main body 3 of the filter plate by the projecting piece 6, only the diaphragm 1 at the partial region is expanded at each pillar 6a, and the load on the diaphragm 1 close to the projecting piece is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a press filter plate in a press filter press in which a press filtration diaphragm is fixed to the press filter plate.

BACKGROUND ART Conventionally, during filtration with a squeeze filter press, the cake held between a pair of filter cloths between a filter plate and a squeeze filter plate is compressed and filtered by expanding a diaphragm of the squeeze filter plate. Various things are known. When attaching the above diaphragm to the press filter plate, there is a method in which a circular clamping metal fitting is placed in the center of the diaphragm, and this is fixed to the press filter plate body with bolts (Utility Model Publication No. 56-119
Publication No. 28).

Problems to be Solved by the Invention In the above-mentioned structure II, the diaphragm is fixed to the core plate only by the circular clamping metal fittings, so it is as if a large rubber membrane is fixed with a small bottle. . Therefore, if the rubber membrane expands under such conditions, the load will be concentrated around the bottle.

That is, when the diaphragm expands, the diaphragms around the entire periphery of the cylindrical metal object try to expand in various directions at the same time, and the load concentrates on the diaphragms around the cylindrical metal object. The diaphragm around the hardware was prone to damage and cracks could occur.

Therefore, in the case of a cylindrical diaphragm, the diaphragms around the entire circumference tend to expand at the same time, so overload is likely to act on the diaphragm, so the inventor arranged a plurality of column parts 17 and made them long. If the expansion of the diaphragm is controlled by connecting with the connecting plate, the diaphragm will expand only in a part of the area, not in the entire area around each column. The present invention was created based on the idea that the load on the diaphragm could be reduced by preventing the diaphragm in the remaining region from expanding by using the long connecting plate.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to provide a compressed filter plate for a compressed filter press that can effectively prevent cracking of the diaphragm.

Means for Solving the Problems In order to achieve the above object, the present invention generally comprises a protrusion by connecting a plurality of pillars with an elongated connecting plate, and connecting the pillars to a diaphragm, The diaphragm is fixed to the press filter plate body so that the expansion of the diaphragm is regulated by the connecting plate part. That is, the compressed filter plate is used in a compressed filter press in which a diaphragm that covers the surface of the compressed filter plate body is fixed to the compressed filter plate body with protrusions, and the protrusions are fitted into the through holes of the diaphragm to form the filter plate. a plurality of pillars that contact the surface of the compressed filter plate body;
a mounting hole that passes through the convex column, an engagement portion that can be tightly engaged with an engagement portion formed in the diaphragm to surround the through hole, and an engagement portion that connects the column to each other and that and a long connecting plate part that is fitted around the diaphragm to restrict expansion, and a protrusion fixing member is inserted into the mounting hole of the protrusion to fix the protrusion to the compressed filter plate main body. It was configured as follows.

Further, in the above configuration, the undiluted solution supply port is provided approximately in the center of the filtration surface of the compressed filter plate main body, and the protrusions are arranged radially around the undiluted solution supply port with respect to the undiluted solution supply port. It can also be configured as

Further, in the above configuration, the engaging portion is formed around the pillar portion and is configured to be able to closely engage with the engaging portion formed around the through hole of the diaphragm. You can also.

Effects and Effects of the Invention According to the above structure, the protrusion is generally configured by connecting the plurality of column parts with the elongated connecting plate part, and the protrusion fixes the diaphragm to the press filter plate main body. Therefore, in each column, the diaphragm in only a part of the area around it expands, not the entire area around it, and the diaphragm in the remaining area is restricted from expanding by the long connecting plate. can do. Therefore, when the diaphragm expands, the load on the diaphragm near the projections is reduced, and cracking of the diaphragm can be effectively prevented.

EXAMPLES Below, examples according to the present invention will be described in detail based on FIGS. 1 to 12.

Squeezing a in the squeezing filter press according to this example
As shown in Fig. 1.2, the filter press equipped with the temporary filter 2 has a pair of guide rails 18, 18 that alternately move the compressed filter plate 2 and the normal filter plate 4 in the front and rear direction between the front and rear stands 14, 15.
After tightening the movable plate 17 toward the front stand side by driving the drive device 16 of the rear stand 15, a pair of filter cloths 8 are arranged to be able to slide against each other, and the stock solution is placed between each filter plate 2.4.
.

The compressed filter plate 2 covers a square plate-shaped filter plate main body 3, the front and rear surfaces of the main body 3, and has protrusions 6. . . . It is composed of a pair of diaphragms 1 and '1 fixed to the main body 3 at 6.

The main body 3 has an inclined surface 3n formed inside a square outer frame 3a, and a filtering surface 3b recessed in a square shape inside the inclined surface 3n.
form. Ear portions 3d, . . . , 3d projecting laterally are integrally formed at each corner of the main body 3.
There are through holes 3e, 3e, 3h.

Form 3h. In FIG. 2, each through hole 3h of each lug 3d at the upper left side and lower right side of the main body 3 is connected to each opening 3j of the inclined surface 3n of the main body 3 through a communication path 31, and is connected to the compressed fluid supply described later. A compressed fluid supply path communicating with the chamber 26 is configured. Further, each through hole 3e of each ear portion 3d at the lower left side and upper right side of the main body 3 is formed in the outer frame 3 of the main body 3.
A filtrate recovery path is configured by connecting each opening 3g of a with a connecting path 3f.

Further, each side of the main body 3 has a handle 3 that protrudes laterally.
Q, and each handle 3Q is slidably mounted on each guide rail 18 arranged in parallel in the front-back direction of the filter press, and each pressing filter plate 2 is connected to a pair of guide rails 18, 18.
Suspended and supported. A stock solution supply port 3k is formed in the center of the filter surface 3b of the main body 3, and a pair of protrusions 3c are formed on each diagonal of the filter surface 3b at a predetermined distance from the filter surface 3b around the stock solution supply port 3. , 3c. Each protrusion 3c has a generally rectangular plate shape, and both ends thereof are curved.

This protrusion 3c is connected to the back surface of the diaphragm l and the filtering surface 3b.
A compressed fluid supply chamber 26 is provided between the surface without the protrusion 3c of
A gap 19 is formed that communicates with the diaphragm 1 (see Fig. 6) to facilitate supply of compressed fluid between the diaphragm 1 and the compressed filter plate main body 3. Both filter surfaces 3 cooperate with the protrusion 4c of the filter plate 4.
a, 4a to prevent damage to the filter surfaces 3a, 4a. In addition, in FIG. 4, 3m is a hole into which a bolt for attaching a protrusion is screwed.

On the other hand, the pair of diaphragms 1.1 are made of an elastic material such as rubber, and are arranged to cover the filter surfaces 3 a, 3 a and the inclined surfaces 3 n, 3 n on both the front and rear sides of the main body 3. , Bolt 22° at the upper and lower ends...
They are connected to each other by 22. In the center of each diaphragm l, a stock solution supply hole is provided which communicates with the stock solution supply port 3k of the main body 3 by fitting a ring 21 to the peripheral edge of the stock solution supply port 3 of the main body 3 through the diaphragm l. 1k is formed. The protrusion 6.・, 6 is placed. As shown in FIGS. 3 to 5, a total of five small through holes 1a, . . . , la are formed in the portion where each protrusion 6 is arranged, and each through hole l
An annular protrusion 1c is formed around a. The outer frame 3 of the main body 3 is attached to the lower left corner and the upper right corner of the diaphragm l.
A filtrate collection port 1g communicating with each opening 3g of a is formed.

Each protrusion 6 is preferably made of hard material such as stainless steel or nylon plywood, and is a generally rectangular plate with curved ends at both ends, as shown in FIGS. The thickness is preferably such that the surface of the protrusion 6 is approximately the same as the surface of the outer frame 3a of the pressing filter plate main body 3 when the protrusion 6 is fixed to the protruding portion 3c of the main body 3. Each protrusion 6 includes five pillar parts 6a, ... 6a, a mounting hole 6b penetrating through the center of each pillar part 6a, and an engagement recess 6C formed around each pillar part 6a.
and a long connecting plate portion 6d that connects the pillar portions 6a, . . . , 6a. Each of the pillar portions 6a is fitted into each of the through holes la of the diaphragm 1 to form the compressed filter plate main body 3.
surface. Each of the engagement recesses 6c tightly fits an annular protrusion lc as an engagement portion formed around each of the through holes 1a of the diaphragm l to bring the diaphragm l and the projection 〇 into close contact with each other, To prevent leakage of compressed air when the diaphragm l expands. The protrusion 6 is attached to the main body 3 by inserting bolts 7 into each of the mounting holes 6b.
It is fixed to the compressed filter plate main body 3 by screwing into the protrusion 3c. At this time, the diaphragm l is sandwiched between the protrusion 6 and the main body 3, but the part that is directly tightened to the main body 3 with the bolt 7, that is, the column part 6a and the main body 3
Since there is no diaphragm l between the
The diaphragm l will not be damaged by tightening. If the protruding portion 3c of the main body 3 to which the protrusion 6 is fixed is made slightly larger than the shape of the protrusion 〇, the protrusion 6 can be stably fixed.
can be fixed to the protrusion 3c. In this example,
Although the protrusion 6 is fixed to the main body 3 with five bolts 7, . The protrusion 6 is the filtering surface 3b of the main body 3
It is preferable that they be arranged in a well-balanced manner around the stock solution supply port 3.

On the other hand, the normal filter plate 4 has an inclined surface formed inside a square plate-shaped outer frame 4a, and further has a square-shaped recessed filter surface 4b formed inside the inclined surface. Similar to the compressed filter plate main body 3, a laterally projecting ear (not shown) is integrally formed at each corner of the normal filter plate 4, and each ear has a through hole. Form. The through holes in the ears on the upper left side and the lower right side of the normal filter plate 4 are connected to the openings in the inclined surface of the normal filter plate through a communication path, and are connected to the compressed fluid supply path of the compression filter plate 2. Configure a fluid supply path. In addition, the through holes of the ears on the lower left side and the upper right side of the ordinary filter plate 4 are formed in the ordinary filter plate 4.
A filtrate recovery path communicating with the filtrate recovery path of the compressed filter plate 2 is formed by connecting with the opening of the outer frame 4a through a connection path. Further, each side of the normal filter plate 4 has a handle 4 projecting in the lateral direction.
Q, each handle 4Q is slidably mounted on each guide rail j8 arranged in parallel in the front and back direction of the filter press, and each ordinary filter plate 4 is suspended and supported by a pair of guide rails 1818. do. A stock solution supply port 4k is formed in the center of the filtration surface 41 of the normal filter plate 4, and a pair of protrusions 4c are formed on each inner line of the filter surface 4b at a predetermined distance around the stock solution supply port 4. , 4 to form c.

Each of the protrusions 4c faces each of the protrusions 6 and has a generally rectangular plate shape with curved ends.
4, each protrusion 6 comes into contact with the protrusion 4c of the normal filter plate 4 through the filter cloth 8.8, and both filter surfaces 2b of the adjacent filter plates 2, 4 are tightened.

A predetermined gap is maintained between the filter surfaces 2b, 4b, and the filter surfaces 2b, 4b are supported so as not to be damaged when the filter plates are tightened or compressed fluid is supplied.

According to the above configuration, the compression filter plate 2 and the normal filter plate 4 are tightened by moving the movable plate 17 toward the front stand side by driving the drive device 16. In this tightened state, the protrusions 6 fixed to the protruding portions 3c of the compressed filter plate main body 3 are connected to the pair of filter cloths 8.
．． 8 and comes into contact with the protrusion 4c of the filter plate 4. In FIG. 2 above, the protrusions 6 are arranged in a well-balanced manner on the diagonal of each filter surface 3b.
．． 4, a roughly uniform tightening force is applied to the filter surface 3.
a, 4 It is designed to act on a.

In the tightened state, the stock solution supply pipe 2 of the front stand 14 is inserted between the pair of filter cloths 8, 8 sandwiched between the filter plates 2, 4.
The stock solution is supplied from 7 to the stock solution supply port 3 of each filter plate 2, 4 via 4, etc., and filtration is performed.

After the stock solution supply operation has been carried out for a predetermined period of time, or when a predetermined amount of stock solution has been supplied, compressed fluid, for example, compressed air, is supplied from the supply pipe 29 to the compression filter plate 2 through the compressed fluid supply path. Diaphragm 1 is expanded. That is, the sixth
As shown in the figure, compressed fluid is supplied to the compressed fluid supply chamber 26 between each diaphragm I and the compressed filter plate main body 3, and in the diaphragm I, the protrusion 6. ...The other parts except the part fixed by 16 expand, and the cake held between both filter cloths 8.8 is compressed and filtered. The filtrate discharged in the filtration and press filtration is collected in the filtrate recovery path and discharged from the filtrate recovery pipe 28. When the predetermined filtration work is completed, the movable plate 17 is moved to the rear stand side by the driving of the drive device 16, and then the filter plates 2 and 4 are individually opened, and the movable plate 17 is held between the filter cloths 8 and 8. Drop the cake downward and collect it.

As shown in FIG.
It is supported by a filter cloth suspension rod 23 suspended by a spring 11 from a pin 10 connecting the upper end of an arm 9 pivotally connected to each handle 3Q, 4Q. Therefore, the filter plates 2, 4
The filter cloths 8.8 vibrate due to the vibrations when the frame is opened, the drive of a vibration imparting device (not shown), etc., and the cake peels off from the filter cloths 8, 8 and falls. After collecting the cake above, rail 2
The filter cloth 8.8 is washed while rotating the washing tube 13 of the washing device 12, which moves back and forth along 0, to the position shown by the dashed line in FIG. 2, using its lower end as a fulcrum.

When the cleaning operation is completed, the filter plates 2 and 4 are tightened again for the next filtration operation.

According to the above embodiment, the protrusion 6 includes a plurality of the pillar portions 6.
a, . . . , 6a are connected by the long connecting plate portion 6d, and the diaphragm l is fixed to the press filter plate main body 3 by the protrusion 6, so that in each column portion 6a, ,
The diaphragm l in only a part of the surrounding area expands, and the diaphragm l in the remaining area can be restricted from expanding by the elongated connecting plate 6d. Therefore, when the diaphragm 1 expands, the load on the diaphragm 1 near the projections is reduced, and cracking of the diaphragm 1 can be effectively prevented.

Moreover, since the diaphragm 1 is fixed to the main body 3 using a long protrusion 6 instead of fixing the diaphragm l to the press filter plate main body 3 with a small circular member, the diaphragm 1 can be fixed to the main body 3 without reducing the filtration area too much. Since the contact area with the diaphragm L can be increased, cracking of the diaphragm L can be more effectively prevented. In addition, each protrusion 3 c,
4c and protrusions 6 are arranged radially toward the corners of the filtration surfaces 3b, 4b with respect to 4k at the stock solution supply port 3, so that the stock solution is smoothly supplied to the filtration surfaces 3b, 4b.
It is possible to supply up to the corners of b.

Note that the present invention is not limited to the above embodiments,
It can be implemented in various other ways. For example, the shape of each protrusion 6 is not limited to the above-mentioned embodiment, and may have various other shapes as long as it is long. Moreover, the number of protrusions 6 is arbitrary. In addition, in each projection 6, the compressed filter plate main body 3
The number of bolts 7 for fixing is also arbitrary. Also,
The number of the pillars 6a is arbitrary, and the shape thereof is not limited to a circle, but may be any polygon such as a quadrangle or a hexagon. In addition, by increasing the thickness of each protrusion 6,
The protrusion 3c of the compressed filter plate main body 3, the protrusion 4c of the normal filter plate 4, or both protrusions 3c and 4c can be made unnecessary. Furthermore, the stock solution supply ports of each filter plate 2 and 4 are not limited to those formed approximately in the center of the filtration surface, but may be formed in any part of the filtration surface, or in the outer frame so as to communicate with the filtration surface. It is also possible to form it. Furthermore, the present invention is not limited to the arrangement in which the compressed filter plates 2 and the normal filter plates 4 are arranged alternately, but can also be applied to a configuration in which only the compressed filter plates 2 are arranged.

Further, the position of the projection 〇 on the filtering surface is arbitrary. For example, as shown in FIG. 7, the protruding portion 3c of the compressed filter plate main body 3 may be formed integrally with the outer frame 3a. That is, the protrusions 3c are formed radially with respect to the stock solution supply port 31k, that is, extending from the outer frame 3a vertically and horizontally, and the protrusions 6 are fixed to each protrusion 3c, and the diaphragms 31.31 may be fixed to the main body 3.

In addition, in FIG. 7, 31g corresponds to the opening Ig of the diaphragm 1. Further, as shown in FIG. 8, three protrusions 3c are formed above and below the stock solution supply port 4Lk, and a protrusion 6 is fixed to each protrusion 3C to attach the diaphragm 41 to the main body. It may be fixed to 3.

Further, in each protrusion, the engagement recess 6c is not limited to being formed around each pillar 6a, but any number of pillars may be grouped together and the engagement recess may be formed around it. good. That is, for example, six pillar portions 36a, . . . , 3
9 to 12 show examples in which 6a is surrounded by one engagement recess 36c. In this protrusion 36, a column portion 36a and a mounting hole 36b are provided.
The connecting plate portion 36d is connected to the pillar portion 6a of the protrusion 6 and the mounting hole 6b.
and the connecting plate portion 6d, respectively. The engagement recess 36c is formed in the outer periphery of the back surface of the protrusion 36 as a recess in the shape of a roughly rectangular frame with curved upper and lower ends as shown in FIG.
It is located on the outer periphery of a. On the other hand, five through holes 1a of the diaphragm l, corresponding to the engagement recess 36c,...
- An engaging protrusion 1d having a generally rectangular frame shape and having curved upper and lower ends as shown in FIG. 9 is formed so as to surround la. Therefore, the engagement protrusion 1d formed on the diaphragm l tightly engages with the engagement recess 36c of the protrusion 36.

Further, the engagement recesses 6c, 36c of the protrusion 6.36 and the engagement portions 1c, ld of the diaphragm 1 may have an opposite uneven relationship. That is, the engaging recesses 6c, 36c may be formed as engaging protrusions, while the engaging portions 1c, ld of the diaphragm 1 may be formed as engaging recesses.

[Brief explanation of drawings]

Figure 1.2 is a side view of a filter press having a squeeze filter plate in a squeeze type filter press according to an embodiment of the present invention, and a sectional view taken along the line ■-■ in Figure 1, and Figures 3.4.5 are A front view of the protrusions attached to the diaphragm, a cross-sectional side view and a cross-sectional plan view of the essential parts of the filter plate with the protrusions tightened, and Figure 6 shows the filter press with the filter plate tightened. Fig. 7 is a front view of a compressed filter plate according to another embodiment, and Fig. 8 is a diaphragm according to another embodiment, and the relationship with the compressed filter plate is shown by dotted lines. The front view of the diaphragm and Figure 9.10.1112 respectively show modified examples of the protrusions. They are a partial cross-sectional side view, a cross-sectional plan view of the main part of the compressed filter plate having the protrusions, and a rear view of the main part of the protrusions. 131.4 diaphragm, 1a... through hole, 1c - annular protrusion, ld... engaging protrusion, 2... compressed filter plate, 3...
- Press filter plate main body, 4 - Normal filter plate, 6, 36... protrusion, 6 a, 36 a-pillar part, 6 b, 36 b=-
Mounting holes, 6c, 36c...Engagement recesses, 6d, 36d...
Long connecting plate part, 7... bolt, 8 a cloth, 9 arm,
10・Pin, 11・Spring, 12・Cleaning device, 13・
...Washing pipe, 14..Front stand, 15. Rear stand,
16 Drive device, 17 Movable plate, 18 Guide rail, 9 Gap, 0 Rail, 21 Ring, 2 Bolt, 3 Filter cloth hanging rod, 25 Cake, 6 Compressed fluid supply chamber. Patent applicant Kurita Machinery Co., Ltd.

Claims (3)

[Claims] (1) A diaphragm (
1) is fixed to the press filter plate main body (3) with protrusions (6, 36) in a press filter press, and the protrusions (6, 36) penetrate through the diaphragm (1). A plurality of pillars (6a, 36a) fitted into the holes (1c) and in contact with the surface of the compressed filter plate main body (3), and a mounting hole (6b) penetrating each of the pillars (6a, 36a). , 36b)
and an engaging portion (6c, 36c) that can be closely engaged with the engaging portion (1c, 1d) formed in the diaphragm (1) so as to surround the through hole (1a), and the pillar portion (6a). ,3
6a) to each other and the pillar portions (6a, 36
a), and a long connecting plate portion (6d, 36d) that is fitted around the diaphragm (1) to restrict expansion of the diaphragm (1), and the mounting hole (6b,
36b) and insert the protrusion fixing member (7) into the protrusion (6).
, 36) are fixed to the press filter plate main body (3). (2) A stock solution supply port (3k) is provided approximately in the center of the filtration surface (3b) of the compressed filter plate body (3), and the projections (6, 36) are arranged around the stock solution supply port (3k). Claim 1 is arranged radially with respect to the stock solution supply port (3k).
A compressed filter plate in the described compressed filter press. (3) The engaging portion (6c) is formed around the pillar portion (6a) and around the through hole (1a) of the diaphragm (1). ) The compressed filter plate in the compressed filter press according to claim 1 or 2, which can be closely engaged with the compressed filter plate.