JP2857062B2 - Structure of pressing plate in pressing filter press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for separating slurry from various civil works into dewatered cake and clean drainage water.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a squeezing plate in a squeezing type filter press capable of increasing the dehydration efficiency by increasing the slurry pressure in the squeezing chamber even by the expansion of a squeezed sheet facing the filtering chamber.

[0002]

2. Description of the Related Art Conventionally, in a filter press of this type, a plurality of filter plates and a plurality of squeezing plates are interposed between a fixed holding plate and a movable holding plate which are relatively movable in the front-rear direction which are close to and away from each other. A filter cloth is provided between each filter plate and each pressing plate alternately so as to be able to move back and forth along the moving direction, and a pressing sheet faces the filter cloth on each pressing plate. It is provided. When each filter plate and each press plate are pressed together with both filter cloths between the two holding plates, a filter chamber surrounded by both filter cloths is formed. Then, the slurry is injected into each filtration chamber from the slurry pressure inlet communicating with each filtration chamber, and air is supplied to the compression chamber of each compression plate, and the compressed sheet expands to the filtration chamber side. Moisture is drained from the drain through the filter cloth. The dewatered cake remaining in each filter chamber is discharged with the separation of each filter plate and each press plate.

Conventionally, in the structure for supplying air to the compression chamber, an air passage is formed in each filter plate and each press plate, and when the filter plates and each press plate are pressed, these air passages communicate with each other. Then, air is supplied to the compression chamber through a branch pipe branched from the air passage of the compression plate.

The pressing sheet is made of rubber, and its outer peripheral portion is integrally fixed to the pressing plate.
The inflated portion inside the outer peripheral portion is formed to be thin.

[0005]

Since the expanded portion of the compressed sheet is thin, when air is supplied to the compression chamber in an empty state where each filter plate and each compressed plate are separated from each other,
There was a risk of tearing.

[0006] As described above, the squeezing chamber in each squeezing plate is connected in series by the air passage of each filter plate and the air passages and branches of each squeezing plate. Air escapes from the damaged part, causing a decrease in pressure not only in the compression chamber facing the damaged part but also in other compression chambers. Therefore, unless the damaged pressed sheet is replaced or the entire pressed plate having the damaged pressed sheet is replaced, the pressing function of other pressed plates is adversely affected, and the operation of the entire filter press must be stopped. , Work efficiency becomes worse.

[0007] In view of the above points, in order to perform efficient smoothly work in pressing plate, to an air supply structure with little mutual influence must be focused on.
The present invention has been made in view of this point .

[0008]

As shown in the drawings of the embodiments to be described later, in a squeezing filter press according to the present invention , a pair of clamping plates 2, 5 which are relatively close to each other and relatively movable in the front-rear direction. A plurality of filtration plates 7 and a plurality of compression plates 8
Are arranged side by side so as to be able to move back and forth along the relative movement direction, and a double filter cloth 1 is provided between each filter plate 7 and each pressing plate 8.
3 and a pressing sheet 18 is provided on each pressing plate 8 so as to face the filter cloth 13.

When the respective filter plates 7 and the respective squeezing plates 8 are pressed together with the two filter cloths between the two holding plates 2 and 5,
A filter chamber 41 surrounded by both filter cloths 13 is formed. Each of the filtration chambers 41 is connected to a slurry injection port 42 communicating with each of the filtration chambers 41.
Is supplied to the pressing chamber 34 in the pressing plate 8 so that the pressing sheet 18 is removed from the filtering chamber 41.
When swelling to the side, the water in each filter chamber 41 is discharged from the filtrate outlets 12 and 17 through the filter cloth 13, and the dewatered cake K remaining in each filter chamber 41 is removed from each filter plate 7 and each press plate 8. Is discharged along with the separation.

In the present invention, each of the compression plates 8 is provided with an air supply port 35 for supplying air to the compression chamber 34, and the air supply port 35 is attached to the compression plate 8.
A mouth member 36 and a mouth member 37 connected to a flexible hose 38;
The two mouth members 36 and 37 are detachable from each other.
To be closed when connected and disconnected
The opening / closing valve V is provided on the opening member 37 .

[0011]

[0012]

In the present invention, when the pressing sheet 18 of one pressing plate 8 is torn, the supply of air is shut off only to the pressing plate 8, and the air is still supplied to the other pressing plates 8.

[0013]

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a press-type filter press according to an embodiment of the present invention.

FIG. 1 shows a part of a squeeze type filter press, in which a fixed holding plate 2 and a fixed supporting plate 3 are provided on both front and rear sides of a base 1.
Are mounted, and side rails 4 are installed on both left and right sides between the boards 2 and 3. The movable clamping board 5 is composed of these two boards 2,
3 and supported on both side rails 4 by a piston rod 6a of a hydraulic cylinder 6 attached to the fixed support plate 3 so as to be movable along the side rails 4 in the front-rear direction approaching and separating from the fixed holding plate 2. Has become. The plurality of filter plates 7 and the plurality of pressing plates 8 are alternately arranged on both side rails 4 between the two holding plates 2 and 5, and can move back and forth along the side rails 4 in the moving direction of the movable holding plate 5. It has become.
A water tank 9 is provided on the base 1 below each filter plate 7 and each press plate 8.

In one filter plate 7 shown in FIGS. 2A, 3A and 4, a slurry injection hole 11 is provided at the center of a filter plate body 10 and a filter plate body 10 is provided. A filtrate outlet 12 is provided at each of four corners of the filter plate 10, and the filter plate main body 1 excluding the slurry injection hole 11 and the filtrate outlet 12 is provided.
The filter cloth 13 is attached to the front and rear surfaces of the “0” so as to face the recess 14. The recess 14 communicates with each of the filtrate outlets 12.

In the single pressing plate 8 shown in FIGS. 2 (b), 3 (b), and 4, a slurry injection hole 16 is provided at the center of the pressing plate main body 15 and the pressing plate main body 15 is provided. A filtrate outlet 17 is provided at each of the four corners of the press plate 15, and rubber press sheets 18 are attached to both front and rear surfaces of the press plate main body 15 except for the slurry inlet 16 and each filtrate outlet 17.

The slurry injection hole 16 of the pressing plate body 15
At the inner peripheral edge 19, annular stopper members 20, 21 made of metal are applied to the front and rear sides thereof, and the two stopper members 20, 21 are pressed against the inner peripheral edge 19 by a plurality of set screws 22. Squeezed plate main body 1 is provided on the inner periphery of both stop members 20 and 21.
A slurry injection hole 23 communicating with the slurry injection hole 16 is formed on both front and rear sides of the slurry injection hole 5. This double stop member 2
0, 21 facing the pressing surface 24 formed on the entire outer periphery,
An annular locking groove 25 is formed in the step so as to extend in the circumferential direction. On the other hand, a mounting hole 26 is formed at the center of the compressed sheet 18, and an annular locking edge 27 is formed on the inner periphery of the mounting hole 26. The locking edge 27 is formed on the outer periphery of the both retaining members 20 and 21 by the pressing surface 24 and the locking groove 25.
Are inserted into the lock groove 25 and engaged with the lock groove 25 so as to be pressed against the pressing surface 24 so as not to fall out of the lock groove 25.

The pressing sheet 18 is formed with four circular locking holes 28 at 90-degree point symmetric positions about the mounting holes 26, and a locking edge 29 is formed on the inner periphery thereof. A latching edge 30 is also formed on the entire outer peripheral portion of the compressed sheet 18. Locking grooves 31, 32 are formed in the pressing plate main body 15 so as to face these locking edges 29, 30.
30 and the engaging grooves 31, 32 are detachably fitted to each other. The retaining edges 29, 30 and the retaining grooves 31, 32 are formed with retaining surfaces 29a, 30a, 31a, 32a, respectively, which are inclined with respect to the detaching direction A of the compressed sheet 18, and the compressed sheets 18 are formed by joining them. A resistance force opposing the detachment force is generated. Squeezed plate body 15
A concave portion 33 is formed facing the compressed sheet 18 in the, and a compressed room 34 is formed between the concave portion 33 and the compressed sheet 18.

A filter cloth 13 is attached to both sides of the pressing plate body 15 facing the outside of the pressing sheet 18. The space between the filter cloth 13 and the compressed sheet 18 communicates with each filtrate outlet 17. An inspection cock (open / close valve) 17 a communicating with the filtrate outlet 17 is attached to the other side of the pressing plate main body 15.

A coupler 35 as an air supply port is attached to one side of the pressing plate body 15. The coupler 35 is conventionally known, and includes a plug 36 and a socket 37. The plug 36 is screwed to the pressing plate main body 15. A flexible hose 38 as an air introduction tube is connected to the socket 37. An on-off valve V (not shown) is provided in the socket 37. Then, the outer sleeve 37a of the socket 37 is pulled back to remove the socket 37.
When the plug 36 is fitted into the opening, the open / close valve V is automatically opened, and the flexible hose 38 and the plug 36 communicate with each other. Further, the outer sleeve 37a is pulled back to connect the socket 37 to the plug 36.
, The on-off valve V automatically closes.

As shown in FIG. 1, an air supply pipe 39 is disposed adjacent to each filter plate 7 and each press plate 8 and outside thereof.
The flexible hoses 38 are connected to the respective branch ports 40. Then, air is supplied from each branch port 40 to the flexible hose 38.
To the coupler 35 and supplied to the squeezing chamber 34.

As described above, in a state where each filter plate 7 and each press plate 8 are pressed together with both filter cloths 13 between the fixed holding plate 2 and the movable holding plate 5, as shown schematically in FIG. A filter chamber 41 surrounded by both filter cloths 13 is formed. Then, the slurry is supplied from the slurry injection port 42 on the fixed holding plate 2 side to the slurry injection holes 11, 16, and 23 (see FIG. 3).
3 and 6, the squeeze sheet 18 is pressed into the recesses 33 of the squeeze plate main body 15, as shown in FIGS.
Side, the volume of the squeezing chamber 34 is reduced, and the moisture in each of the filtering chambers 41 is passed through the filter cloth 13 to the filtrate outlet 1.
2, 17 (see FIG. 2).

When air is supplied from the branch ports 40 of the air supply pipe 39 to the compression chamber 34 through the flexible hose 38 and the coupler 35, the compressed sheet 18 is removed from the filtration chamber 41 as shown in FIGS. The volume of the filtration chamber 41 is reduced by expanding to the side, and the slurry pressure in the filtration chamber 41 is increased. Therefore, the slurry in the filtration chamber 41 is further dehydrated.

When the piston rod 6a of the hydraulic cylinder 6 shown in FIG. 1 is retracted and the movable holding plate 5 is separated from the fixed holding plate 2, each filter plate 7 and each pressing plate 8 are moved one by one to the movable holding plate 5 side. Moved to At this time, as shown in FIG. 8, each filter plate 7 and each press plate 8 are separated, and the dewatered cake K remaining in each filter chamber 41 is discharged.

This embodiment has the following features (a) to (c) . (A) When the squeezed sheet 18 is torn in one squeezed plate 8, the coupler 35 is used only in the squeezed plate 8.
If the plug 36 and the socket 37 are separated from each other,
Flexible hose 3 connected to branch 40 of air supply pipe 39
8 can be removed from the squeezing plate 8. Therefore, the supply of air is shut off only to the compressed plate 8 having the damaged compressed sheet 18, and the air is still supplied to the other compressed plates 8. Therefore, even if the compressed plate 8 having the damaged compressed sheet 18 is not replaced, normal operation can be continued with the compressed plate 8 other than the compressed plate 8 as described above, and the work efficiency can be improved. (B) In the coupler 35 between the flexible hose 38 connected to the branch port 40 of the air supply pipe 39 and the compression plate 8, the socket 37 on the flexible hose 38 side separated from the plug 36 on the compression plate main body 15 side. Since the open / close valve V is provided inside, the air does not leak out from the flexible hose 38 disconnected from the compression plate 8, and the compression chamber 34 is connected to the other flexible hose 38 connected to the compression plate 8. Air can be reliably supplied. (C) Since the pressing plate 8 has the inspection cock 17a,
If the cock 17a is opened arbitrarily, it flows out to the filtrate outlet 17.
Check for breakage of filter cloth 13 by checking muddy water
be able to.

In addition to the above embodiments, the following (a) to (c)
It may be configured as follows. (B) The air supply port on the pressing plate 8 side and the branch port 40 on the air supply pipe 39 side are connected by a flexible hose 38, and a stop valve is attached to the air supply port or the branch port 40.
Then, while the flexible hose 38 is connected, the stop valve is operated to shut off the air supply only to the compressed plate 8 having the damaged compressed sheet 18.

(B) Both the air supply port and the branch port are formed as couplers as in the above embodiment. Alternatively, only the branch port is a coupler. (C) Each filter plate 7 is also provided with a pressing sheet 18 and a pressing chamber 34 in the same manner as the pressing plate 8.

Considering the above embodiments, the following concept can be understood. (B) In claim 1, the air introduction pipe is a flexible hose 3
8, the air supply port includes a port member (plug 36) attached to the pressing plate main body 15 and a port member (socket 37) connected to the flexible hose 38. The two mouth members are
It has an on-off valve V that is detachable from each other, communicates when connected, and closes when separated. The flexible hose 38 bends following the movement of the squeeze plate 8 and is therefore less likely to be damaged. In addition, the supply and cutoff of air can be easily performed by attaching and detaching the two port members.

[0030]

According to the present invention, the damaged compressed sheet 1
Even if the pressing plate 8 having the pressing plate 8 is not replaced, normal operation can be continued with the pressing plate 8 other than the pressing plate 8, and the work efficiency can be improved.

[0031]

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a state where slurry is poured into each filter plate and each press plate pressed by both holding plates in a press filter press according to the present embodiment.

FIG. 2A is a side view showing one filter plate according to the present embodiment, and FIG. 2B is a side view showing one press plate similarly.

3A is an enlarged cross-sectional view taken along line XX of FIG. 2A, and FIG. 3B is an enlarged cross-sectional view taken along line YY of FIG. 2B.

FIG. 4 is a partially enlarged cross-sectional view showing a state where the filter plate and the pressing plate shown in FIG. 3 are pressed against each other.

FIG. 5 is a principle sectional view showing a state where a filter plate and a pressing plate are pressed against each other before slurry injection.

FIG. 6 is a partial cross-sectional view showing a state where the slurry is injected into the filter chamber from the state of FIG.

FIG. 7 is a partial cross-sectional view showing a state where air is supplied to the compression chamber from the state of FIG.

FIG. 8 is a partial cross-sectional view showing a state where the filter plate and the squeeze plate are opened from the state of FIG. 7;

[Explanation of symbols]

Reference numeral 2: fixed clamping plate, 5: movable clamping plate, 7: filter plate, 8: compression plate, 10: filter plate body, 11: slurry injection hole, 12
... Filtrate outlet, 13 ... Filter cloth, 15 ... Squeezed plate body, 16 ...
Slurry injection hole, 17 ... filtrate outlet, 18 ... pressed sheet, 29 ... hanging edge, 30 ... hanging edge, 31 ... hanging groove, 32
... Hanging groove, 34 ... Compression chamber, 35 ... Coupler as air supply port, 36 ... Plug, 37 ... Socket, 38 ... Flexible hose as air introduction pipe, 39 ... Air supply pipe, 40 ...
Branching port, 41: filtration chamber, 42: slurry inlet, V: open / close valve as shutoff means, K: dewatered cake.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01D 25/12

Claims (1)

(57) [Claims] 1. A plurality of filter plates (7) and a plurality of squeezing plates (8) are arranged along a direction of relative movement between sandwiching plates (2, 5) which are relatively movable in the front-rear direction approaching and separating from each other. Each filter plate (7) and each pressing plate (8) are juxtaposed to be movable back and forth.
And a double filter cloth (13) is provided between the filter cloth (8) and a press sheet (18) is attached to each press plate (8).
When the filter plates (7) and the squeezing plates (8) are pressed together with the filter cloths (13) between the clamping plates (2, 5), the filter cloths (2, 5) are pressed. 13) A filter chamber (41) surrounded by the filter chamber (41) is formed, slurry is injected into each filter chamber (41) from a slurry injection port (42) communicating with each filter chamber (41), and the inside of the pressing plate (8) is formed. Compression room (3
Air is supplied to 4) to squeeze the compressed sheet (18) into the filter chamber (4).
1) When swelling to the side, the water in each filter chamber (41) is discharged from the filtrate outlet (12, 17) through the filter cloth (13), and the dewatered cake (K) remaining in each filter chamber (41). ) Is discharged with the separation of each filter plate (7) and each press plate (8). In each press plate (8), air is supplied to its press chamber (34). provided the air supply port (35), respectively, the air supply
The supply port (35) is a port member (3) attached to the pressing plate (8).
6) and mouth member (37) connected to flexible hose (38)
The mouth members (36, 37) are detachable from each other
And communicates when connected and closes when disconnected
As described above, the opening member (37) is provided with the opening / closing valve (V).