JPH0838814A - Structure-of pressing plate of filter press - Google Patents

Abstract

PURPOSE:To provide a pressing plate structure capable of continuing a normal operation by a pressing plate other than a pressing plate with a damaged sheet without replacing, and improving working efficiency by connecting each air induction pipe for supplying air to each supply port, and providing a means of interrupting air supply to each compression chamber. CONSTITUTION:If the piston rod 6a of a hydraulic cylinder 6 moves back and a movable holding disc 5 separates from a fixed holding disc 2, each filter plate 7 and each pressing plate 8 are shifted one by one to the side of the movable holding disc 5. In this case, each filter plate 7 separates from each pressing plate 8, and a dehydrated cake remaining in each filtration chamber 41 is discharged. If a pressing sheet is damaged on one pressing plate 8, a movable hose 38 connected to the bifurcated port 40 of an air feed pipe 39 can be detached from that pressing plate 8 by separating the plug of a coupler 35 from a socket. Consequently, the supply of air is interrupted only to the pressing plate 8 which has a damaged pressing sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the case where the slurry produced in various civil engineering works is separated into dehydrated cake and clean filtered water.
The present invention relates to the structure of a squeezing plate in a squeezing filter press that can increase the dewatering efficiency by increasing the slurry pressure in the filter chamber by expanding the squeezing sheet facing the filter chamber.

[0002]

2. Description of the Related Art Conventionally, in this type of filter press, a plurality of filter plates and a plurality of squeezing plates are provided between a fixed sandwiching plate and a movable sandwiching plate that are relatively movable in the front-rear direction and are spaced apart from each other. The filter sheets are alternately arranged side by side along the moving direction so as to be movable back and forth, and a filter cloth is provided between each filter plate and each press plate, and a press sheet faces each filter plate. Is provided. When the filter plates and the compression plates are pressed together with the filter cloths between the sandwiching plates, a filter chamber surrounded by the filter cloths is formed. Then, while the slurry is injected into each filter chamber from the slurry pressure inlet leading to each filter chamber, air is supplied to the compression chamber of each compression plate and the compression sheet expands to the filtration chamber side, Water is drained from the drain through the filter cloth. The dehydrated cake remaining in each filter chamber is discharged as the filter plates and the press plates are separated from each other.

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

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

[0005]

Since the expanded portion of the squeezing sheet is thin, when air is supplied to the squeezing chamber in an empty state in which the filter plates and the squeeze plates are separated from each other,
There was a risk of tearing.

As described above, the squeezing chambers in each squeezing plate are connected in series by the air passage of each filter plate and the air passage and branch of each squeezing plate. Air escapes from the damaged portion, causing a decrease in pressure not only in the compression chamber facing the damaged portion but also in other compression chambers. Therefore, unless the crushed squeezed sheet is replaced or the entire filter plate having the squeezed squeezed sheet is replaced, the squeezing function of the other squeezing plates is also adversely affected and the operation of the entire filter press must be stopped. , The work efficiency becomes poor.

Considering the above points, in order to perform efficient and smooth work, the pressing plate should firstly have an air supply structure with little mutual influence, and secondly, a pressing sheet that is not easily broken. We must pay attention to that. The present invention has been made in view of the above two points.

[0008]

As shown in the drawings of the embodiments to be described later, in the squeezing filter press according to the first invention and the second invention, both sandwiching plates which are relatively movable in the front-rear direction in which they approach and separate from each other. A plurality of filter plates 7 and a plurality of compression plates 8 are arranged side by side between 2 and 5 so as to be movable back and forth along the relative movement direction, and a double filter is provided between each filter plate 7 and each compression plate 8. A filter cloth 13 is provided, and a compression sheet 18 is provided on each of the compression plates 8 so as to face the filter cloth 13.

When the filter plates 7 and the press plates 8 are pressed together with the filter cloths between the holding plates 2 and 5,
A filter chamber 41 surrounded by the filter cloths 13 is formed. From the slurry injection port 42 leading to each filter chamber 41 to each filter chamber 41
Slurry is injected into the pressurizing plate 8 and air is supplied to the pressurizing chamber 34 in the pressurizing plate 8 to move the pressurizing sheet 18 into the filter chamber 41.
When swelled 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 dehydrated cake K remaining in each filter chamber 41 is filtered by each filter plate 7 and each compression plate 8. Are discharged with the separation of.

In the first invention, each compression plate 8 is provided with an air supply port 35 for supplying air to the compression chamber 34, and an air introduction pipe 38 for supplying air to each air supply port 35 is provided. Means V that are connected to each other and that shut off the supply of air to each compression chamber 34 are provided.

In the second invention, the squeeze plate 8 comprises a squeeze plate body 15 and a squeeze sheet 18 attached to the squeeze plate body 15 to form a squeeze chamber 34 therebetween. The press plate body 15 is provided with an air supply port 35 for supplying air to the press chamber 34. Locking edges 29, 30 are provided at the mounting portion of the compression sheet 18 to the compression plate body 15, and the locking groove 3 into which the locking edges 29, 30 are fitted.
1, 32 are provided, and the engaging edges 29, 30 and the engaging groove so that the engaging edges 29, 30 can be separated from the engaging grooves 31, 32 when the compression chamber 34 reaches a predetermined pressure or more. 31, 32
The retaining surfaces 29a, 30a, 31a, 32a are provided between and to provide resistance.

[0012]

In the first aspect of the invention, when the squeezing sheet 18 of one squeezing plate 8 is broken, the air supply is cut off only for the squeezing plate 8 and the air is still supplied to the other squeezing plates 8. .

According to the second aspect of the present invention, when the filter plate 7 and the compression plate 8 are separated from each other and an abnormal air pressure is generated in the compression chamber 34 in the compression plate 8, the compression sheet 18 is made to some extent. After swelling, the hooking edges 29, 30 of the compressed sheet 18
Is separated from the retaining grooves 31 and 32 of the squeezing plate body 15, and air is released from the separated portions.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A compression type filter press according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a part of the squeezing filter press, which includes a fixed holding plate 2 and a fixed support plate 3 on both front and rear sides of a base 1.
Are mounted, and side rails 4 are erected on both left and right sides between the two boards 2 and 3. Movable clamping board 5 is both boards 2,
3 is supported on both side rails 4 and is movable along the side rails 4 in the front-rear direction in which the piston rod 6a of the hydraulic cylinder 6 attached to the fixed support board 3 approaches and separates from the fixed holding board 2. Has become. The plurality of filter plates 7 and the plurality of squeeze plates 8 are alternately arranged in parallel on both side rails 4 between the two holding plates 2 and 5, and can be moved 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 the single filter plate 7 shown in FIGS. 2A, 3A and 4, a slurry injection hole 11 is provided at the center of the filter plate body 10 and the filter plate body is also provided. A filtrate outlet 12 is provided at the four corners of the filter plate main body 10 except for the slurry injection hole 11 and the filtrate outlet 12.
Filter cloths 13 are attached to the front and rear surfaces of the above so as to face the recesses 14. The recess 14 communicates with each filtrate outlet 12.

In the single pressing plate 8 shown in FIGS. 2B, 3B and 4, the pressing plate body 15 is provided with a slurry injection hole 16 in the central portion thereof, and the pressing plate body is also provided. Filtrate outlets 17 are provided at the four corners of 15, and rubber press sheets 18 are attached to the front and rear surfaces of the press plate body 15 excluding the slurry injection hole 16 and each filtrate outlet 17.

The slurry injection hole 16 of the compression plate body 15
Metallic annular stopper members 20 and 21 are applied to the front and rear sides of the inner peripheral edge 19 of the inner peripheral edge 19, and the both stopper members 20 and 21 are pressed against the inner peripheral edge 19 by a plurality of setscrews 22. The pressing plate body 1 is provided on the inner circumferences of the both stop members 20 and 21.
The front and rear sides of the slurry injection hole 16 of No. 5 are formed with the slurry injection holes 23 communicating with them. This both stop member 2
Facing the pressing surface 24 formed on the entire outer periphery of 0, 21,
An annular locking groove 25 is formed in the step portion so as to extend in the circumferential direction. On the other hand, a mounting hole 26 is formed in 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 stop members 20 and 21 and the pressing surface 24 and the locking groove 25.
In the state of being inserted into the locking groove 25 and being engaged with the locking groove 25, it is pressed against the pressing surface 24 so as not to fall out of the locking groove 25.

Four squeezing holes 28 are formed in the squeezing sheet 18 at 90-degree point symmetry with the mounting hole 26 as the center, and a shacking edge 29 is formed on the inner periphery thereof. A hooking edge 30 is also formed on a mounting portion of the entire outer periphery of the compressed sheet 18. Hooking grooves 31, 32 are formed in the pressing plate body 15 so as to face these hooking edges 29, 30, and
30 and the retaining grooves 31 and 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 that are inclined with respect to the detaching direction A of the compressed sheet 18, and are joined together to form the compressed sheet 18. A resistance force against the withdrawal force of is generated. Pressing plate body 15
A concave portion 33 is formed on the side facing the compression sheet 18, and a compression chamber 34 is formed between the concave portion 33 and the compression sheet 18.

Filter cloths 13 are attached to the front and rear surfaces of the squeezing plate body 15 so as to face the outside of the squeezing 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) 17a communicating with the filtrate outlet 17 is attached to the other side of the compression plate body 15.

A coupler 35 as an air supply port is attached to one side of the compression plate body 15. This coupler 35 is well known in the prior art and comprises a plug 36 and a socket 37. The plug 36 is screwed to the compression plate body 15. A flexible hose 38 as an air introduction pipe is connected to the socket 37. An open / close valve V (not shown) is provided in the socket 37. Then, the outer sleeve 37a of the socket 37 is pulled back to pull out the socket 37.
When the plug 36 is fitted in, the on-off valve V automatically opens and the flexible hose 38 and the plug 36 communicate with each other. Further, the outer cylinder sleeve 37a is pulled back to insert the socket 37 into the plug 36.
On the other hand, the opening / closing valve V is automatically closed.

As shown in FIG. 1, an air supply pipe 39 is arranged on the outer side of each filter plate 7 and each compression plate 8 adjacent to each other.
The flexible hoses 38 are connected to the respective branch openings 40. Then, air flows from each branch port 40 to the flexible hose 38.
Through to the coupler 35 and is supplied to the compression chamber 34.

As described above, when the filter plates 7 and the pressing plates 8 are pressed together with the 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 injected from the slurry injection port 42 on the side of the fixed holding plate 2 into the slurry injection holes 11, 16 and 23 (see FIG. 3).
When the squeeze sheet 18 is injected into each filter chamber 41 through the recess 33 of the squeeze plate body 15 as shown in FIGS.
The volume of the squeezing chamber 34 is reduced by bending to the side, and the water in each filter chamber 41 passes through the filter cloth 13 and the filtrate outlet 1
2, 17 (see FIG. 2) are discharged.

When air is supplied from the respective branch openings 40 of the air supply pipe 39 to the compression chamber 34 through the flexible hose 38 and the coupler 35, as shown in FIGS. It swells to the side and the volume of the filter chamber 41 is reduced, and the slurry pressure in the filter chamber 41 is increased. Therefore, the slurry in the filter 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, the filter plates 7 and the pressing plates 8 are individually moved to the movable holding plate 5 side. Is moved to. At this time, as shown in FIG. 8, the filter plates 7 and the press plates 8 are separated from each other, and the dehydrated cake K remaining in the filter chambers 41 is discharged.

This embodiment has the following characteristics (a) to (e). (A) When the squeezing sheet 18 is broken in a certain squeezing plate 8, the coupler 35 is formed only in the squeezing plate 8.
If the plug 36 and socket 37 of are separated from each other,
Flexible hose 3 connected to branch port 40 of air supply pipe 39
8 can be detached from the pressing plate 8. Therefore, the air supply is interrupted only to the pressing plate 8 having the damaged pressing sheet 18, and the air is still supplied to the other pressing plates 8. Therefore, even if the squeezing plate 8 having the damaged squeezing sheet 18 is not replaced, the squeezing plates 8 other than the squeezing plate 8 can continue normal operation 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 flexible hose 38 side socket 37 separated from the compression plate body 15 side plug 36. Since the opening / closing valve V is provided inside, air does not leak from the flexible hose 38 that is disconnected from the compression plate 8, and the compression hose 34 is compressed from the other flexible hose 38 connected to the compression plate 8. Air can be reliably supplied to the. (C) When an abnormal air pressure is generated in the compression chamber 34 in the compression plate 8 in a state where the filter plates 7 and the compression plates 8 are separated from each other, the compression sheet 18 swells to some extent and then the compression sheet A part of the hooking edges 29, 30 of 18 is detached from the hooking grooves 31, 32 of the squeeze plate body 15, and air is released from the detached portions. Therefore, unnecessary pressure is not applied to the compressed sheet 18, and the compressed sheet 18 can be prevented from being damaged. Therefore, it is not necessary to replace the compression plate 8, and the work efficiency can be improved. (D) In the state where each filter plate 7 and each compression plate 8 are pressed against each other, the locking edges 29, 30 on the compression sheet 18 side fitted in the locking grooves 31, 32 on the compression plate body 15 side are Since it is sandwiched between the compression plate body 15 and the filter plate 7, even if air is supplied to the compression chamber 34, the hooking edges 29 and 30 have the hooking grooves 31 and 30.
It does not fall out of 32, and air is reliably sent to the compression chamber 34, and the compression sheet 18 swells. When the squeezed sheet 18 swells in this pressed state, since the slurry has already been supplied to the filter chamber 41, the pressure in the filter chamber 41 and the pressure in the squeeze chamber 34 cancel each other out, so that the squeezed sheet 18 needs more pressure than necessary. Is not applied, and the squeezing sheet 18 is not damaged. (E) Since the pressing plate 8 has the inspection cock 17a, it is possible to inspect whether or not the filter cloth 13 is damaged by checking the muddy water flowing out to the filtrate outlet 17 by opening the cock 17a arbitrarily.

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

(B) Both the air supply port and the branch port are the couplers as in the above embodiment. Alternatively, use only the branch port as a coupler. (C) Similar to the pressing plate 8, the pressing sheet 18 and the pressing chamber 34 are attached to each of the filter plates 7.

Considering the above-mentioned embodiments, the following concept can be understood. (A) In claim 1, the air introducing pipe is a flexible hose 3
8, the air supply port is composed of a mouth member (plug 36) attached to the compression plate body 15 and a mouth member (socket 37) connected to the flexible hose 38. This double-ended member,
The on-off valve V is detachable from each other and communicates when connected and closes when separated. Since the flexible hose 38 bends following the movement of the compression plate 8, it is not easily damaged. Further, by attaching and detaching the both-end members, it is possible to easily supply and cut off the air.

[0030]

According to the first aspect of the present invention, the squeeze plate 8 having the squeezed squeeze sheet 18 that has been damaged need not be replaced.
Normal operation can be continued with the other compression plates 8 other than the above, and the work efficiency can be improved.

According to the second aspect of the present invention, the squeezing sheet 18 is not subjected to excessive pressure, damage to the squeezing sheet 18 can be prevented, and the squeezing plate 8 does not need to be replaced, thereby improving work efficiency. Can be achieved.

[Brief description of drawings]

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

FIG. 2 (a) is a side view showing one filter plate according to the present embodiment, and FIG. 2 (b) is a side view showing the same press plate.

3A is an enlarged sectional view taken along line XX of FIG. 2A, and FIG. 3B is an enlarged 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 compression plate shown in FIG. 3 are pressed against each other.

FIG. 5 is a principle cross-sectional view showing a state in which a filter plate and a compression plate are pressed against each other before slurry injection.

FIG. 6 is a partial cross-sectional view showing a state in which the slurry has been poured into the filter chamber from the state of FIG.

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

FIG. 8 is a partial cross-sectional view showing a state in which the filter plate and the pressing plate are opened from the state of FIG.

[Explanation of symbols]

2 ... Fixed holding plate, 5 ... Movable holding plate, 7 ... Filtration plate, 8 ... Compression plate, 10 ... Filtration plate body, 11 ... Slurry injection hole, 12
... filtrate outlet, 13 ... filter cloth, 15 ... pressing plate body, 16 ...
Slurry injection hole, 17 ... Filtrate outlet, 18 ... Squeeze sheet, 29 ... Hanging edge, 30 ... Hanging edge, 31 ... Hanging groove, 32
... latching 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 ...
Branch port, 41 ... filter chamber, 42 ... slurry injection port, V ... open / close valve as shutoff means, K ... dehydrated cake.

Claims (2)

[Claims] 1. A plurality of filter plates (7) and a plurality of squeezing plates (8) are arranged along the relative movement direction between both holding plates (2, 5) that are relatively movable in the front-rear direction and are close to each other. These filter plates (7) and compression plates (8) are arranged side by side so that they can move back and forth.
A double filter cloth (13) is provided between the filter cloth (13) and the press sheet (18) on each press plate (8).
Facing each other, and when the filter plates (7) and the pressing plates (8) are pressed together with the filter cloths (13) between the holding plates (2, 5), the filter cloths (7) A filter chamber (41) surrounded by 13) is formed, and slurry is injected into each filter chamber (41) from a slurry inlet (42) leading to each filter chamber (41), and inside the press plate (8). Press Room (3
4) to supply air to the squeezing sheet (18) to the filter chamber (4
When inflated to the 1) side, water in each filter chamber (41) is discharged from the filtrate outlet (12, 17) through the filter cloth (13), and the dehydrated cake (K) remaining in each filter chamber (41) is discharged. ) Is discharged with the separation of each filter plate (7) and each compression plate (8), air is supplied to the compression chamber (34) of each compression plate (8). Means for providing each air supply port (35), connecting each air supply pipe (38) for supplying air to each air supply port (35), and interrupting the air supply to each compression chamber (34) (V) is provided respectively, The structure of the pressing plate in the pressing type filter press characterized by the above-mentioned. 2. A plurality of filter plates (7) and a plurality of squeezing plates (8) are arranged along the relative movement direction between both holding plates (2, 5) that can move relative to each other in the front-rear direction and move toward and away from each other. These filter plates (7) and compression plates (8) are arranged side by side so that they can move back and forth.
A double filter cloth (13) is provided between the pressing plate (8) and the pressing sheet (18) facing the filter cloth (13). When the filter plates (7) and the press plates (8) are pressed together with the filter cloths (13), the filter chambers (41) surrounded by the filter cloths (13) are formed. The slurry is injected into each filter chamber (41) from the slurry inlet (42) leading to each filter chamber (41), and the compression chamber (3) in this compression plate (8) is
4) to supply air to the squeezing sheet (18) to the filter chamber (4
When inflated to the 1) side, water in each filter chamber (41) is discharged from the filtrate outlet (12, 17) through the filter cloth (13) and the dehydrated cake (K) remaining in each filter chamber (41) is discharged. )
In the squeezing filter press, which discharges each filter plate (7) and each squeezing plate (8) as they are separated from each other, the squeezing plate (8) includes a squeezing plate body (15) and the squeezing plate body (15). 15) attached between them and the squeeze chamber (3
4) is formed, and an air supply port (35) for supplying air to the compression chamber (34) is provided in the compression plate body (15), and the compression plate body (15) is provided. A hooking edge (29, 30) is provided at the mounting portion of the pressing sheet (18) to the pressing plate (15), and a hooking groove (31) in which the hooking edge (29, 30) is fitted to the pressing plate body (15). , 32), and the compression chamber (3
4) when the pressure exceeds a predetermined pressure, the hook edge (29, 3)
0) can be disengaged from the retaining grooves (31, 32) so that the retaining surfaces (29a, 30a, 31a, 32a) are provided between the retaining edges (29, 30) and the retaining grooves (31, 32). The structure of the squeezing plate in the squeezing filter press, which is characterized by providing resistance.