JPH10296012A - Device for cleaning filter press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning device which is capable of cleaning a filter press efficiently and positively without the necessity to use a complicated mechanism. SOLUTION: This cleaning device B is connected to an injection aperture 2a through a switching valve 20 in a filter press A, and is equipped with a cleaning hose 22 with a nozzle member 21, capable of jetting a cleaning water in the radial direction, provided on the tip part and an insertion guide member 23 for introducing the cleaning hose 22 into the filter press A. In addition, the insertion guide member 23 is connected to the injection aperture 2a through the switching valve 20. Further, when cleaning a filter cloth, the cleaning hose 22 is introduced into an open hole in each of filtration plates sequentially inside the filter press A through the injection aperture 2a, and the cleaning water is jetted into each of the filtration chambers from the nozzle member 21 on the tip part to clean the filter cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the cleaning of a filter cloth in a squeezing type filter press which separates a liquid to be treated, such as wastewater containing sludge and cement, generated in civil engineering work into dewatered cake and clean water. It concerns the device.

[0002]

2. Description of the Related Art Conventionally, a filter press of this type has a large number of filter plates which are arranged side by side so as to be able to move in the direction of pressing and separating each other, a filter cloth is attached to each filter plate, and each filter plate is pressed. A filter chamber is formed between the filter cloths adjacent to the adjacent filter plates, and an opening is provided at the center of each filter plate and filter cloth to allow each filter chamber to communicate with each other. The processing liquid is press-fitted and dehydrated.

[0003] The filtered water is provided with a drain hole in a filter plate,
After being discharged downward through the passage and repeating the treatment 7 to 8 times a day, the dewatered cake due to sludge remaining in each filtration chamber is discharged by separating each filter plate.

If the filter cloth is left as it is after one day of dehydration filtration processing and the final dewatered cake is discharged, sludge remains on the filter cloth, causing clogging, which lowers the filtration processing efficiency. Therefore, washing is performed after the completion of one day's processing, and it is desired that this processing can be performed efficiently.

[0005] As a conventional filter cloth cleaning apparatus, a water jet is used for cleaning the filter cloth surface by a manual or automatic cleaning machine with each filter plate being separated, or water is passed from the filter plate discharge side of filtered water. All of these methods, such as backwashing, are used, but the apparatus becomes complicated and the cost increases, and the washing efficiency is not sufficiently satisfactory.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a cleaning apparatus capable of efficiently and reliably cleaning a filter press of this type without moving a filter plate to provide an interval. It is.

[0007]

In order to solve the above-mentioned problems, a filter press according to the present invention has a cleaning device in which a number of filter plates are juxtaposed so as to be able to move in the pressure contact and separation directions, and a filter cloth is attached to each filter plate. A filter chamber is formed between the filter cloths that are adjacent to the filter plates when the filter plates are pressed against each other, and an opening is provided in the center of each filter plate and filter cloth to allow each filter chamber to communicate with each other. In a file loopless configured to press-in and dehydrate a liquid to be treated from an inlet communicating with each filtration chamber through an opening, the inlet of the liquid to be treated is provided with a feed pipe for the liquid to be treated. Separately, a cleaning device connected via a switching valve is provided.The cleaning device includes a cleaning hose provided with a jet nozzle capable of jetting cleaning water in a radial direction at a distal end portion, and the cleaning hose. It has an insertion guide member for feeding into the filter press. The insertion guide member is connected to the inlet through a switching valve, and at the time of washing, the washing hose is sequentially passed through the opening of each filter plate in the filter press through the inlet from the tip side thereof, By injecting washing water into each filter chamber by the tip injection nozzle,
It is characterized in that the filter cloth is washed.

[0008] In the above-mentioned cleaning apparatus, the cleaning hose is wound around a reel so as to be able to be drawn out, and is particularly provided with a feeding means driven by a motor for feeding the cleaning hose into a filter press. preferable.

Further, the insertion guide member keeps the nozzle member at the tip of the cleaning hose airtight when the cleaning hose is inactive, and prevents the nozzle member from being pulled out to the side opposite to the filter press. A configured one is preferred.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 schematically show a filter press (A), in which a fixed base plate (2) and a support base plate (3) are opposed to both longitudinal ends on a base (1). Are provided, and side rails (4) and (4) are provided between the two boards. (5) is a movable pressing plate facing the fixed base plate (2), and is movably supported by the side rails (4) and (4) along the rails. An output rod (6a) of a pressing cylinder device (6) such as a hydraulic cylinder supported by the support base plate (3) is connected to the movable pressing plate (5). ), The movable pressing plate (5) is provided so as to be pushed or separated in the opposite direction toward the fixed base plate (2) via the rod (6a).

Reference numeral (7) denotes a number of filter plates provided in parallel between the fixed base plate (2) and the movable pressing plate (5), and these filter plates (7) are provided on both side rails (4). And (4) are supported so as to be able to move in a direction in which they can be pressed against and separated from each other along the rail, and the movable pressing plate (5) is pushed by the cylinder device (6) to the side of the fixed base plate (2). To be pressed against each other, and can be separated by the retreat of the movable pressing plate (5). Further, the cylinder device (6) can cope with pressure fluctuation during dehydration due to injection of the liquid to be treated, and always keeps a good pressure contact state.

As shown in FIG. 3, each of the filter plates (7) has an edge frame member (71) for press-contacting on both sides of a peripheral portion of a filter plate body (70) having an opening (8) in the center. 72) is fixed, and a packing material (73) is fixed to the surface of one of the edge frame members (71).
One of the packing members (73) of (7) is provided so as to be pressed against the other edge frame member (72) with a filter cloth described later interposed therebetween to maintain an airtight state.

On both side surfaces of the filter plate body (70), draining layers (74) (74) made of a net made of nylon or other synthetic fiber having water permeability are provided at the portions corresponding to the openings (8). It is stuck except for. Further, a filter cloth (10) having an opening (11) corresponding to the opening (8) is attached to the outside thereof so as to cover both side surfaces of the filter plate (7). In the peripheral portion, the flanges (75) and (75) are fixed to the filter plate body (70) together with the drainage layers (74) and (74). Thereby, when each filter plate (7) is pressed, a filter chamber (13) is formed between both filter cloths (10) (10) along the adjacent filter plates (7) (7). Become. Each of these filter chambers (13) is provided with an opening (8) in the filter plate body (70).
And an opening (11) of the filter cloth (10).

The fixed base plate (2) has an inlet (2) communicating with each filter chamber (13) through the opening (8).
a) is provided so that the non-treatment liquid can be press-fitted from the inlet (2a) by a pressure-feeding means (not shown) such as a pump in the press-contact state. The liquid to be treated is squeezed and filtered in the chamber (13).

The filtered water filtered by the filter cloth (10) flows down through a drainage layer (74) such as a net, and is formed on the filter plate body (70) or the edge frame members (71) and (72). It is provided to drop onto the base (1) through a discharge hole (not shown) and be collected on the base (1) or collected and discharged after flowing from the base (1). I have.

The dewatered cake remaining in the filter chamber (13) after being filtered by the filter cloth (10) is discharged along with the separation of each filter plate (7) by the operation of the cylinder device (6). It has become.

The structure of such a filter press is basically the same as that of the conventional filter press. However, in the present invention, the following filter cloth (10) is washed after discharging the last dewatered cake. Such a configuration is adopted.

The cleaning device (2) is connected to the inlet (2a) of the liquid to be treated via a switching valve (20) such as an electric ball valve, separately from the feed pipe (18) for the liquid to be treated. B).

The cleaning device (B) includes a cleaning hose (22) provided with a nozzle member (21) at the tip end capable of spraying cleaning water in a radial direction, and a filter press (A). ), And an insertion guide member (23) for feeding the insertion guide member (23).
Is connected to the inlet (2a) via the switching valve (20) by being fastened to the switching valve (20) by a fastening means (24) such as a bolt and a nut. The cleaning hose (22) is configured to be fed into the filter press (A) through the inlet (2a) from the tip side thereof.

As shown in FIGS. 4 and 5, the nozzle member (21) is composed of a hose connection side cylinder (21b) and a slightly larger diameter end side cylinder (21a). The portion (21a) has a required interval in the axial direction at a plurality of positions, and for each required interval in the circumferential direction, for example, 90
Nozzles (25) in the radial direction are provided at equal angle intervals such as °. In the case of the drawing, nozzle holes (25) are provided in two rows in the circumferential direction at a slight interval at the forefront position, so that the injection ratio of the cleaning water at the front end is increased.

The insertion guide member (23) holds the nozzle member (21) in the inserted state at the time of non-cleaning such as dehydration processing, that is, when the cleaning hose (22) is not used. A tubular member (23b) through which the hose connection side tubular portion (21b) of the nozzle member (21) can be inserted and a tubular member (23a) through which the distal end tubular portion (21a) can be inserted; (27), and the distal end side cylindrical portion (21a) has a tapered engagement portion (2).
By engaging with (6), it is possible to hold the filter press (A) in a state where it is prevented from being pulled out to the opposite side.

(28) is a bearing member made of metal or the like for holding the hose connection side tubular portion (21b) slidably in the axial direction on the inner periphery of the tubular member (23b), and (29) is a packing such as an O-ring. It is configured to keep the space between the nozzle member (21) and the nozzle member airtight. For this reason, at the time of dehydration processing, the switching valve (20) and the packing material (29)
Thus, the side of the insertion guide member (23) is double-closed, and the liquid to be treated does not leak.

The cleaning hose (22) has its hose body (22a) wound around a reel portion (30) so as to be drawn out, and sends the cleaning hose (22) to the filter press (A). Feeding means (3
1) is provided. The feeding means (31) includes one or more pairs of feeding rollers (32) (3) which can rotate while holding the hose body (22a) from above and below as shown in the figure.
3), one of which is provided so that one of the feed rollers (32) is connected to a driving means (34) such as a motor and is driven to rotate.
The cleaning hose (22) can be fed to the filter press (A) side, and can be returned to the original state by reverse rotation.

The washing hose (22) is provided so that washing water can be appropriately sent under pressure by operation of a pumping means such as a pump (not shown).

The operation of the above-described washing apparatus will be described. After one day of filtration and dehydration by the filter press (A), the press-in of the liquid to be treated is stopped and each filter plate (6) is stopped by the cylinder device (6). Separate 7) to each filtration chamber (13)
After the dewatered cake of sludge accumulated in the container is dropped and discharged, the movable plate (5) is pushed again by the operation of the cylinder device (6) to press the filter plates (7) into pressure.

In this manner, the switching valve (20) connected to the inlet (2a) for the liquid to be treated is opened, and the pumping means such as a pump is operated to supply the cleaning water to the cleaning hose (2).
2). In this state, the feeding means (31) is operated to move the cleaning hose (22) from the side of the nosle member (21) at the tip thereof through the switching valve (20) and the inlet (2a) to the filter press (2). A), and the openings (8) of the respective filter plates (7) existing in the axial center portion thereof
Through the nozzle member (2
By jetting the washing water in the radial direction from the nozzle hole (25) of 1) toward each filtering chamber (13), each filtering chamber (1) is sprayed.
Wash the filter cloth (10) in 3).

In particular, when the nozzle member (21) has nozzle holes (25) which can be radially sprayed at a plurality of positions at predetermined intervals in the axial direction as shown in the figure, a plurality of filter chambers are simultaneously formed. Since the washing water can be simultaneously jetted into (13) and the washing water is jetted repeatedly by its movement, the filter cloth (10) can be efficiently and reliably washed. In addition, even when the nozzle member (21) is pulled out after being inserted to the innermost part, the washing efficiency of the filter cloth (10) can be further increased by spraying the washing water in the same manner as described above.

Particularly, by injecting the cleaning water at a high pressure, the jetting power from the nozzle hole (17) can be increased.

In the above embodiment, the nozzle member (2) at the tip of the cleaning hose (22) is used during non-cleaning such as during dehydration.
Although the case where 1) is held in a state of being inserted through the insertion guide member (23) has been shown, the nozzle member (21) at the tip of the cleaning hose (22) is usually replaced with the insertion guide member (23). And may be inserted into the insertion guide member (23) at the time of cleaning.

When the amount of cleaning water jetted during the above-mentioned cleaning increases, excess cleaning water that cannot be discharged from the drain hole of the filter plate flows back to the insertion guide member (23), thereby causing the insertion guide. Since the space between the member (23) and the hose body (22a) is ejected, the insertion guide member (23)
As such, those having a function of discharging the surplus water are preferable.

FIG. 6 shows an embodiment of the insertion guide member (23) having the function of discharging the surplus water. In this embodiment, the connection side with the switching valve (20) is formed as a reducer (35), and a drain hole (36) is provided below the reducer (35). Reducer (3
An elastic shielding plate (37) made of an annular rubber plate or the like is provided between 5) and the hose connection side tubular portion (23b), and when the cleaning hose (22) is fed into the filter press (A), The elastic shielding plate (37) is in sliding contact with the outer periphery of the hose body (22a) to prevent leakage of the cleaning water.

The above-mentioned washing operation can be carried out with the respective filter plates (7) pressed against each other, or can be carried out slightly apart from each other. However, when separated, the washing water sprayed in the radial direction is diffused. Shielding means to prevent this is required.

[0034]

As described above, according to the present invention, the cleaning water is press-fitted into the filter chamber using the normal press-fitting passage for the liquid to be treated, and is jetted into the filter chamber. The filter cloth can be easily and reliably washed.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a filter press.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged sectional view of a filter plate portion.

FIG. 4 is a sectional view schematically showing a cleaning apparatus of the present invention.

FIG. 5 is a sectional view of a main part of the above.

FIG. 6 is a partial sectional view showing another embodiment.

[Explanation of symbols]

 (A) Filter press (B) Cleaning device (1) Base (2) Fixed platform (2a) Injection port of liquid to be treated (3) Support platform (4) (4) Side rail (5) Movable press (6) Cylinder device (7) Filtration plate (70) Filtration plate body (8) Opening (10) Filter cloth (11) Opening (13) Filtration chamber (18) Supply pipe for liquid to be treated (20) Switching Valve (21) Nozzle member (22) Cleaning hose (23) Insertion guide member (25) Nozzle hole (31) Feeding means (35) Reducer (37) Elastic shielding plate

Claims (3)

[Claims] A plurality of filter plates are arranged between a fixed base plate and a movable pressing plate which are opposed to each other so as to be movable in a pressing and separating direction, and a filter cloth is attached to each filter plate. A filter chamber is formed between filter cloths adjoining the adjacent filter plates when pressed against each other, and an opening is provided in a central portion of each filter plate and the filter cloth to allow each filter chamber to communicate with each other. In a filter press configured to press-in and dewater a non-treatment liquid from an inlet, a cleaning device connected to an inlet of the treatment liquid, separately from a feed pipe for the treatment liquid, via a switching valve The cleaning device has a cleaning hose provided with a nozzle member capable of jetting cleaning water in a radial direction at a tip end thereof, and an insertion guide member for feeding the cleaning hose to a filter press. The insertion guide member contacts the inlet through a switching valve. Then, at the time of washing, the washing hose is sequentially passed through the opening of each filter plate in the filter press from the tip side through the inlet, and the washing water is injected into each filter chamber by the nozzle member at the tip end. By doing
A cleaning device for a filter press, wherein the filter cloth is cleaned. 2. The cleaning hose according to claim 1, wherein said cleaning hose is wound around a reel so as to be able to be pulled out, and is provided with feeding means for feeding said cleaning hose to a filter press. Cleaning equipment in filter press. 3. The cleaning device according to claim 2, wherein the insertion guide member keeps the nozzle member at the tip of the cleaning hose airtight when the cleaning hose is inactive, and prevents the nozzle member from being pulled out to the side opposite to the filter press. The cleaning device in the filter press according to claim 1, wherein the cleaning device is configured as follows.