JP3451551B2 - Filter plate filter, filter cloth cleaning method in filter plate filter, and filter cloth cleaning device for filter plate filter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fixes a filter plate coated with a filter cloth to a machine frame, and the filter plate is a stock solution to be filtered (typically a waste solution for washing a mixer from a fresh concrete mixer truck). Cement-containing slurry) has a stock solution supply hole,
A filter plate type filter machine in which a plurality of filter plates are continuously polymerized in the longitudinal direction so that the stock solution supply holes face each other so as to be separable and a filter chamber is provided between adjacent filter plates, and the filter plate type filter. TECHNICAL FIELD The present invention relates to a filter cloth cleaning method for a filter machine, and a filter cloth cleaning device for a filter plate type filter equipped with technical means for carrying out the filter cloth cleaning method.

[0002]

2. Description of the Related Art Conventionally, a filter plate covered with a filter cloth is fixed to a machine frame, and the filter plate has a stock solution supply hole for supplying a stock solution to be filtered so that the stock solution supply holes face each other. A plurality of filter plates are provided so as to be superposed in the longitudinal direction so as to be separable and separable from each other, and a filter chamber is provided between adjacent filter plates. From the stock solution supply hole (stock solution injection port in the present invention) of the end filter plate. A filter plate type filter machine (commonly referred to as a filter press) is known in which a dehydrated cake is produced in each filtration chamber by supplying a stock solution to be filtered.

In order to use this filter repeatedly,
It is necessary to wash the filter cloth after the dehydrated cake has been generated / separated and removed.
It is equipped with. The dehydrated cake is dropped and removed by separating the adjacent filter plates and opening the filter chamber (open frame state in the present invention).

For example, Japanese Unexamined Patent Publication No. 11-290615 [hereinafter, referred to as prior art. ] Discloses a method and an apparatus for cleaning a nozzle of a filter chamber (filter cloth). Here, the feed path of the undiluted solution supply and the entrance path of the washing nozzle are shared, and the check valve switches between the undiluted solution supply (filtering; dehydrated cake production) and the filter cloth washing processing steps.

As can be seen from the drawings of the embodiments, it is not possible to open all the filter plates at one time with this device scale (it is considered that one filter plate or a few plates at most) is accompanied by this. The same applies to filter cloth washing. Therefore, although the filter cloth cannot be completely washed [described in paragraph 0037 of the specification], the cake dregs accumulated at the bottom of the filtration chamber can be filtered together with the stock solution when the next stock solution is filtered. It is said that it is not necessary to remove [described in paragraph 0016 of the specification].

That is, it is possible to save a large amount of the cleaning liquid in that the steps of supplying the raw liquid (pour-in), filtering, discharging the cake (open frame), and cleaning the filter cloth can be repeated by automatic operation. Certainly, sewage generated in sand plants and civil engineering sites is compressed and dehydrated and removed in the form of dehydrated cake (solid waste) that can be easily post-treated, and the filtrate is rendered harmless to the extent that it can be released to the environment. In that respect, it may have a certain effect.

[0007]

However, regarding the prior art, it cannot be said that the problems still remain (unsuitable) when the undiluted solution containing cement is filtered.

This is because if the adhered particles on the filter cloth cannot be washed almost completely (dust-free treatment), the remaining calcium content will dry and solidify over time, causing clogging of the filter cloth. However, in the ready-mixed concrete industry, it has been regarded as a serious problem due to the legalization of industrial waste treatment methods (enforced on April 1, 2001).

That is, whether the dehydrated cake containing cement particles (industrial waste) satisfies the processing standard (strength) of stable type or controlled type is a serious problem related to the final disposal site and the recycling process. is there. As of August 1996, the stable type standard [Ministry of Health and Welfare] has a compressive strength of 7.84 MPa (80
Although it is said that the value is kgf / cm ² ) or more, it is the actual situation that those skilled in the art other than the present inventor have not yet been able to satisfy this.

Here, the problem (technical solution problem) is obvious, and it can be said that it is concentrated on the improvement of the action effect including the time reduction of the filter cloth cleaning process (particularly the dust-free process), and the cleaning waste liquid. Must be done with the collection of. As a matter of course, the improvement of the cleaning effect leads to the life prolonging effect of the filter cloth which is repeatedly used, and further, the reduction of the apparatus maintenance cost.
The scale of the equipment is about 20 filter plates (stock solution treatment capacity: 3
It is sufficient to assume the range of 0 to 500 liters / shot.

The present invention has been made in view of the above circumstances, and solves the above problems, and the filter cloth cleaning process in a filter plate type filter is performed by inserting and removing the cleaning nozzle with one stroke to obtain each filter plate. Simultaneously wash the filter cloth,
The cleaning wastewater is discharged very efficiently by using the stock solution supply hole as a conduit so as not to raise the water pressure (to the surface of the filter cloth) in the filtration chamber during the cleaning process. Provided is a filter plate type filter that contributes to prolonging the life of a cloth, a filter cloth cleaning method in the filter plate type filter, and a filter cloth cleaning device for a filter plate type filter equipped with technical means for carrying out the filter cloth cleaning method. It is a thing.

[0012]

In order to solve the problems, the present invention is, firstly, an improvement of a filter plate type filter, which is a machine frame opening / closing means capable of superposing or separating all filter plates in one stroke, 1
Equipped with a cleaning nozzle and cleaning nozzle driving means that can be inserted and removed over the entire length of the stock solution supply holes of the polymerization filter plate by strokes, and each injection hole can be fixed facing each filtration chamber, and pressure is applied to all filter plates from one direction for polymerization. In the closed frame state, the washing nozzle was housed, and the undiluted slurry was pumped to form the dehydrated cake on the surface of the filter cloth in the filtration chamber, and then all the filter plates were pulled from one direction to be separated. In the open frame state, the dehydration cake is separated from the surface of the filter cloth and dropped from the filtration chamber, and the dehydration cake generation / separation processing mechanism is placed in a closed frame state in which all filter plates are pressed and re-polymerized. The cleaning nozzle is advanced, and high-pressure clean water is supplied to the cleaning nozzle and sprayed simultaneously from each spray hole to simultaneously clean each filter cloth of all filter plates. As wastewater It is characterized in that comprises a filter cloth cleaning and sewage drainage mechanism for yield.

Secondly, there is provided a filter cloth washing method using the above filter plate type filter, which comprises:
In a closed frame state in which all filter plates are pressurized and re-polymerized from one direction, the washing nozzles are inserted into the undiluted solution supply holes, the injection holes are placed facing the filtration chambers, and clean water is supplied to the cleaning nozzles at high pressure. It is characterized in that it simultaneously sprays all the filter chambers from each spray hole to wash each filter cloth at the same time, and collects the cleaning wastewater during this time by introducing it to the outside of the machine through the stock solution supply hole as a conduit. is there.

Thirdly, there is provided a filter cloth cleaning device used for carrying out the above-mentioned filter cloth cleaning method, which is mounted on the filter plate type filter machine and can open or close a machine frame capable of superposing or separating all filter plates in one stroke. Means, a cleaning nozzle that can be inserted and removed over the entire length of the undiluted solution supply hole of the polymerization filter plate in one stroke, and a cleaning nozzle and a cleaning nozzle driving means that can set the injection holes facing the filtration chambers, respectively, to form a dehydrated cake. After the separation treatment, the washing nozzle is put in and set in a closed frame state in which all filter plates are pressed from one direction and re-polymerized, and fresh water is supplied to the washing nozzle at a high pressure and jetted simultaneously from each jet hole. It is characterized in that each filter cloth of all filter plates is subjected to simultaneous cleaning treatment, and cleaning wastewater during that time is introduced to the outside of the machine through the stock solution supply hole as a pipe to be collected.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is a filter plate type filter having the above-mentioned structure or a filter cloth cleaning device for a filter plate type filter, which has a cleaning solution inlet and a stock solution inlet on one side at the machine end. The cleaning nozzle drive means is installed in a step so that it faces the stock solution supply hole of the end filter plate, and the cleaning nozzle can be inserted / removed in one stroke over the entire length of the stock solution supply hole of the polymerization filter plate from the cleaning solution injection port of the upper stage. Then, the cleaning wastewater is drained from the undiluted solution injection port using the undiluted solution supply hole as a conduit and collected outside the machine.

In the filter cloth washing method in the filter plate type filter described above, in order to carry out the dehydration cake generation / separation treatment and the subsequent filter cloth washing treatment by supplying the cement-containing slurry or bentonite muddy water as a stock solution, The filter cloth washing treatment performed immediately after the separation treatment is the first step, and then all the filter plates are placed in an open frame state, and the particle group retained in the first step is separated from the filter cloth surface and dropped from the filtration chamber. After that, all the filter plates are closed, and the second step in which the filter cloth washing treatment similar to the first step is performed for a predetermined time is included again, so that the surface of the filter cloth is made dust-free.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1A and 1B are a schematic explanatory view (at the time of dehydration) of the configuration of a filter plate type filter according to the present invention as viewed from above and a schematic side view of the configuration as viewed from the side (when dehydrated). .

FIG. 2 is a schematic view (a) when viewed from above (when cleaning the filter cloth) and a schematic view (b) when viewed from the side (when cleaning the filter cloth).

FIG. 3 is a schematic explanatory view of a partial structure of a sectional view.

FIG. 4 is a schematic side view showing an embodiment of the filter cloth cleaning device of the present invention.

FIG. 5 is an explanatory sectional view showing the arrangement of the injection holes of the cleaning nozzle.

As shown in FIGS. 1 to 3, the embodiment filter (X) is a machine which can press or pull the whole filter plate (1..1) from one direction to polymerize or separate in one stroke. A frame opening / closing means (5) and a cleaning solution inlet (7) and a stock solution inlet (8) are installed on one side of the machine end in upper and lower stages to form a stock solution supply hole (6) of the end filter plate (1). A cleaning nozzle drive that allows the cleaning nozzle (10) to be inserted and removed from the upper cleaning liquid injection port (7) in one stroke over the entire length of the undiluted solution supply hole (6..6) of the polymerization filter plate (1..1) It is equipped with means (12). As is clear from the figure, the total length of the stock solution supply holes (6 ... 6) is equal to the span of the polymerization filter plate (1 ... 1) in the longitudinal direction (polymerization direction).

Each filter plate (1) is interposed between the fixed platen (41) and the movable platen (42), and the machine frame opening / closing means (5) is provided on the movable platen (42) side and the fixed platen (41) side. A cleaning nozzle drive means (12) is arranged. Here, a motor driven hydraulic cylinder (51) is used as the machine frame opening / closing means (5), and a motor driven hydraulic cylinder or air cylinder (121) is used as the cleaning nozzle driving means (12). The machine frame opening / closing means (5) and the cleaning nozzle driving means (12) may be provided on the side of the moving board (42). [Not shown]

Then, the slurry-like stock solution is pumped (9) from the stock solution inlet (8) to the stock solution supply hole (6) to form a dehydrated cake on the surface of the filter cloth (2) in the filter chamber (3). After that, all the filter plates are pulled in one direction and set in an open frame state, and the dehydrated cake is separated from the surface of the filter cloth (2) and dropped from the filter chamber (3). Have.

Further, in a closed frame state in which all the filter plates (1 ... 1) are pressed and re-polymerized from one direction, the cleaning liquid injection port (7) faces the respective filtration chambers (3) and the injection holes ( 11) Insert the cleaning nozzle (10) that can be placed, and insert the cleaning nozzle (1)
At the same time, the filter cloth (2) of all filter plates (1 ... 1) is simultaneously washed by supplying high-pressure fresh water to (0) and spraying it from each injection hole (11) simultaneously. It has a filter cloth cleaning / sewage drainage mechanism that introduces drainage into the stock solution inlet (8) using the supply holes (6 ··· 6) as a conduit and collects it outside the machine.

In the filter cloth washing method using the filter plate type filter (X) having this structure, immediately after the dehydrated cake is formed and separated, all the filter plates (1..1) are pressed from one direction to re-polymerize. With the closed frame closed, from the cleaning liquid inlet (7) to the cleaning nozzle (1
0) to face the filtration chambers and to inject the injection holes (1
Place 1) and supply clean water to the cleaning nozzle (10) under high pressure.
The filter cloths (2) are simultaneously cleaned by simultaneously spraying from each spray hole (11) to all the filtration chambers (3 ··· 3), and the cleaning wastewater in the meantime is used as a stock solution using the stock solution supply hole (6) as a conduit. It is drained from the inlet (8) and collected outside the machine.

The filter cloth cleaning device (Y) used for carrying out this filter cloth cleaning method is mounted on the filter plate type filter (X) as shown in FIG. The cleaning solution injection port (7) and the stock solution injection port (8) are constructed in two steps, one above the other, to face the stock solution supply hole (6) of the end filter plate (1), and the cleaning solution injection port (7) provided in the upper step. ) To the respective filtration chambers (3), and a cleaning nozzle (10) in which the injection holes (11) can be fixed, and the cleaning nozzle (10) is attached to the polymerization filter plate (1).
..1) over the entire length of the undiluted solution supply hole (6..6)
A cleaning nozzle drive means (12) that can be inserted and removed by a stroke is provided.

As shown in FIG. 5, the injection holes (11) of the cleaning nozzle (10) are provided at positions in which the nozzle cross-section circles are arranged at equal intervals of 4 to 8, whereby the cleaning liquid is supplied in the entire 360 ° circumferential direction. It can be jetted, and the entire filtration chamber (3) is evenly washed (filter cloth washing).

After the dehydrated cake is produced and separated, the washing nozzle (10) is moved to the polymerization filter plate (1.・
Entry over the entire length of the undiluted solution supply hole (6..6) in 1)
Place and perform the filter cloth cleaning method described above.

Regarding the filter plate type filter having the above structure, the filter cloth washing method in the filter plate type filter, or the filter cloth washing apparatus for the filter plate type filter, in the most preferred embodiment, the cement-containing slurry or bentonite mud water is supplied as a stock solution. In this way, the dehydrated cake is generated and separated, and then the filter cloth is washed.

In this case, the filter cloth cleaning treatment performed immediately after the dehydration cake generation / separation processing is the first step (filter cloth cleaning 1 described later), and then all the filter plates are placed in an open frame state and the first step is performed. The accumulated particles are separated from the surface of the filter cloth and dropped from the filter chamber, and then all the filter plates are closed, and the filter cloth washing treatment similar to the first step is again performed for a predetermined time in the second step (the filter described later). Cloth washing 2) is included.

FIG. 6 exemplifies a flow chart of the equipment operation (processing operation procedure).

As shown in FIG. 7 which is a schematic sectional view of another embodiment of the filter plate type filter (X ') or the filter cloth cleaning device (Y'), the conventional stock solution supply pipe is used for cleaning. The nozzle (10) and the cleaning nozzle driving means (12) [filter cloth cleaning device Y '] may be incorporated.

[0035]

EFFECTS OF THE INVENTION The present invention is constituted as described above, and according to this, dehydrated cake formation (closed frame) -cake separation / removal (open frame) -filter cloth washing 1 (closed frame) -adherent particle separation.・
Removal (open frame) to filter cloth washing 2 (closed frame) is performed by opening / closing the machine frame and inserting / removing the cleaning nozzle in one stroke, and simultaneously performing dehydration cake generation or filter cloth cleaning while filtering. It is possible to simultaneously drain the cleaning wastewater using the stock solution supply hole as a conduit so as not to raise the water pressure (to the filter cloth surface) in the room.

Particularly when the cement-containing slurry or bentonite muddy water is used as the stock solution, there are no particles remaining on the filter cloth (dust-free treatment), which contributes to prolonging the life of the filter cloth filter cloth for repeated use. It has a high industrial utility value in that it enables stable treatment of waste.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view (at the time of dehydration) of a configuration of a filter plate type filter according to one embodiment when viewed from above and a schematic view (at the time of dehydration) when viewed from a side.

FIG. 2 is a schematic view (a) when viewed from above (when cleaning the filter cloth) and a schematic view (b) when viewed from the side (when cleaning the filter cloth).

FIG. 3 is likewise a schematic explanatory view of a partial configuration in a sectional view.

FIG. 4 is a schematic side view configuration diagram of a filter cloth cleaning device according to an embodiment.

FIG. 5 is a cross-sectional view explanatory diagram showing an arrangement of injection holes of a cleaning nozzle.

FIG. 6 is a flowchart of a device operation (processing operation procedure) in the optimum embodiment.

FIG. 7 is a schematic cross-sectional view configuration diagram of a filter plate type filter or filter cloth cleaning device according to another embodiment.

[Explanation of symbols]

1 filter plate 2 filter cloth 3 filtration chambers 4 machine frames 41 Fixed plate 42 Moving board 5 Machine frame opening / closing means 51 hydraulic cylinder 6 Undiluted solution supply hole (pipe line) 7 Cleaning liquid inlet 8 undiluted solution inlet 9 pumps 10 Washing nozzle 11 injection holes 12 Cleaning nozzle drive means 121 Hydraulic cylinder or air cylinder X filter plate type filter X'filter plate type filter Y filter cloth cleaning device Y'filter cloth cleaning device

Claims (4)

(57) [Claims] 1. A filter plate covered with a filter cloth is fixed to a machine frame, and the filter plate has an undiluted solution supply hole for supplying an undiluted solution to be filtered, and a plurality of undiluted solution supply holes face each other. In the filter plate type filter machine in which the filter plates are continuously polymerized in the longitudinal direction and are separably connected to each other and a filter chamber is provided between adjacent filter plates, one stroke is performed by pressurizing or pulling all the filter plates from one direction. The machine frame opening / closing means that can be polymerized or separated by, and the cleaning solution injection port and the stock solution injection port on one side of the machine end are constructed in two steps, to face the stock solution supply hole of the end filter plate, and to inject the cleaning solution in the upper step. A cleaning nozzle driving means that can insert and remove the cleaning nozzle from the inlet into the stock solution supply hole of the polymerization filter plate in one stroke is installed, and the slurry-like stock solution is pumped from the stock solution inlet to the stock solution supply hole to filter the filter cloth in the filtration chamber. After forming a dehydrated cake on the surface, an open frame that pulls all filter plates away from one direction The dehydration cake is separated from the surface of the filter cloth and dropped from the filtration chamber.The dehydration cake generation / separation processing mechanism is used. Simultaneous cleaning treatment of each filter cloth of all filter plates by advancing a cleaning nozzle that can set each injection hole facing each filtration chamber, supplying high-pressure clean water to the cleaning nozzle and spraying simultaneously from each injection hole. At the same time, a filter plate type filter equipped with a filter cloth washing / sewage drainage mechanism for collecting cleaning wastewater in the meantime through a stock solution supply hole to a stock solution and introducing it into the stock solution inlet to collect it outside the machine. 2. In a closed frame state in which all filter plates are pressurized and polymerized from one direction, a slurry-like stock solution is pumped from a stock solution inlet to a stock solution supply hole to form a dehydrated cake on the surface of a filter cloth in a filtration chamber. After generation, all filter plates are pulled in one direction and placed in an open frame state, and the dehydrated cake is separated from the filter cloth surface and dropped from the filter chamber. A filter cloth washing method in a machine, wherein the filter cloth washing method uses the filter plate type filter according to claim 1 , wherein all filter plates are re-polymerized by pressing from one direction immediately after the dehydrated cake is formed and separated. In the closed frame state, the washing nozzle is inserted into the undiluted solution supply hole, the respective injection holes are set facing the respective filtration chambers, and high-pressure fresh water is supplied to the cleaning nozzles, and all the injection chambers are simultaneously jetted from all the injection holes. Wash each filter cloth at the same time. Filter cloth cleaning method in filtration plate type filter device, characterized in that the washing wastewater is drained into the outside of the stock solution supply hole as a conduit recovery between. 3. A filter cloth cleaning device for a filter plate filter, which is mounted on a filter plate filter, and which subsequently carries out a cleaning process of a filter cloth after the dehydration cake is produced and separated, and the filter cloth cleaning device for a filter plate filter according to claim 2 . A filter cloth cleaning device used for carrying out a filter cloth cleaning method, comprising a machine frame opening / closing means capable of polymerizing or separating all filter plates in one stroke, and inserting / withdrawing over the entire length of a stock solution supply hole of the polymerized filter plate in one stroke. It is equipped with a cleaning nozzle and a cleaning nozzle driving means that can fix the injection holes facing the respective filtration chambers, and after the dehydration cake generation / separation process, press all filter plates from one direction to re-polymerize. In the closed frame state, the washing nozzle enters the undiluted solution supply hole of the polymerization filter plate, and the respective injection holes are set facing the respective filtration chambers. By jetting A filter cloth for a filter plate type filter, characterized in that the filter cloths of all the filter plates are simultaneously washed and the cleaning wastewater in the meantime is introduced into the outside of the machine through the stock solution supply hole as a conduit to be collected. Cleaning device. 4. A cleaning liquid injection port and a stock solution injection port are constructed in two stages on one side of the machine end so as to face the stock solution supply hole of the end filter plate, and the cleaning liquid injection port is provided from the upper stage. And a cleaning nozzle driving means formed by inserting and removing the cleaning nozzle in one stroke so as to face each other, and introducing the cleaning wastewater into the stock solution inlet through the stock solution supply hole as a conduit. The filter cloth cleaning device for a filter plate type filter according to claim 3 , wherein the filter cloth is collected outside the machine.