JP2826472B2 - Filter press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which one filter plate is tightened or opened with the other filter plate, and filtration is performed when the filter plates are tightened while a filter cloth is interposed between adjacent filter plates. While doing
The present invention relates to a filter press that opens a filter plate after the completion of filtration and discharges cake from a filter cloth between adjacent filter plates.

[0002]

2. Description of the Related Art Conventionally, as a filter press, a plurality of filter plates are supported and arranged on a support rail, and a movable plate disposed at one end of these filter plate groups is advanced by a filter plate tightening device to remove the filter plates. In some cases, the fixed plate side is tightened from one side, or movable plates are arranged at both ends of a filter plate group, and both movable plates are driven by a filter plate tightening device to be tightened from both sides. In such a filter press, after the filtration is completed, the movable plate is retracted by a filter plate tightening device and the filter plates are opened one by one by a filter plate opening device, or adjacent filter plates are chained or linked. And the opening of a plurality of filter plates is performed simultaneously with the retreat of the movable plate. That is, each filter plate is fed one by one by filter plate opening devices provided on both sides of each filter plate.

[0003]

However, in the above structure, the tightening stroke of the movable plate of the filter plate tightening device is equal to the sum of the opening intervals of each filter plate.
When the number of filter plates increases, the tightening stroke increases,
There is a disadvantage that the total length of the filter press is increased. In addition, the filter plate opening device is to maintain the opening distance of the filter plate accurately and repeat the opening and closing operation of the filter plate by the movable plate,
There is also the problem that considerable accuracy is required. Further, there is a problem that the filter plate opening apparatus is complicated and has many parts.
For this reason, the apparatus becomes complicated, the maintenance and management are troublesome, and the cost of the filter press is increased. Therefore, an object of the present invention is to solve the above-mentioned problem, and the distance of the filter plate movement is reduced, the filter plate opening device is not required, the highly accurate filter plate movement is not required, and the number of parts is also reduced. An object of the present invention is to provide a filter press which can simplify the entire apparatus, can reduce maintenance work, and can reduce costs.

[0004]

In order to achieve the above object, the present invention provides a filter plate tightening device for moving a first row of filter plates relative to a second row of filter plates. (For example, by moving the movable filter plate with respect to the fixed filter plate) so that the filter plate is opened between one opposing filter plates and the filter plate is tightened between the other opposing filter plates. Configure. That is,
According to the first aspect of the present invention, the filter bed is provided on each of the front surface and the back surface, and the stock solution supply passage for supplying the stock solution is opened for each of the filter beds. A plurality of fixed filter plates connected to the filter plate, and a movable filter plate which is movably disposed between the fixed filter plates one by one and is connected so as to be integrally movable with each other, and has filter beds on the front surface and the back surface, respectively. And, a filter cloth disposed between an adjacent fixed filter plate and a movable filter plate, and the filter cloth interposed between the fixed filter plates, one of the front and back surfaces of each movable filter plate facing each other. The movable filter plate is moved integrally so as to be tightened so that it can be filtered, and at the same time, the other of the front and back surfaces of each of the movable filter plates and the fixed filter plate with the other surface facing each other. While opening the space, the front and back of each movable filter plate At the same time, the other filter is fastened so as to be filterable with the filter cloth interposed between the fixed filter plates facing each other, and the one surface and the one surface of the front and back surfaces of the movable filter plates face each other. A movable filter plate tightening device for integrally moving the movable filter plate so as to open the space between the movable filter plate and the fixed filter plate. According to the invention of claim 2, in the invention of claim 1, the movable distance of the movable filter plate is an open plate distance between the movable filter plate and a fixed filter plate adjacent to the movable filter plate. Can be configured. According to a third aspect of the present invention, in the first or second aspect of the present invention, the undiluted liquid communication conduit for supplying undiluted liquid to the filter cloth located on the filter bed side of the surface of the fixed filter plate through the undiluted liquid supply passage. And a stock solution communicating conduit for feeding stock solution through the stock solution supply passage to the filter cloth located on the filtration bed side on the back surface of the fixed filter plate. According to the invention according to claim 4, a plurality of first filter plates, each having a filter bed on the front surface and the rear surface, are arranged at least at intervals of the filter plate opening intervals and integrally connected, and the first filter plate A second filter plate, which is disposed one by one between them and integrally connected to each other, and has a filter bed on each of the front and back surfaces, and is disposed between the adjacent first and second filter plates; And the first filter plate is tightened with the filter cloth interposed between the first filter plate and one of the front and back surfaces of each of the second filter plates. The filter cloth is interposed between the first filter plate on which the other one of the front surface and the back surface of each of the second filter plates faces while moving integrally and relatively to the second filter plate. The first filter plate is moved integrally and relatively to the second filter plate so as to be tightened. Configured to include an attached plate clamping device. According to the invention according to claim 5, in the invention according to claim 4, the relative movable distance between the first filter plate and the second filter plate is between the adjacent first filter plate and the second filter plate. Can be configured to be the open plate distance. According to the invention according to claim 6, in the invention of claim 4 or 5, the filter cloth interposed between the filter bed on the back surface of the first filter plate and the filter bed on the surface of the second filter plate. An undiluted solution communication conduit for supplying undiluted solution to the filter cloth; and a undiluted solution communication conduit for supplying undiluted solution to the filter cloth interposed between the filtration bed on the surface of the first filter plate and the filtration bed on the back surface of the second filter plate Can be further provided.

[0005]

According to the structure of the present invention, the rows of the first filter plate (for example, movable filter plate) and the second filter plate (for example, fixed filter plate) are simultaneously opened and closed. No matter how many filtration chambers are formed between the filter plates, the filter plates can be sufficiently tightened and the filter plates can be opened by driving the filter plate clamping device by the stroke of one filter chamber. . Therefore, the driving distance of the filter plate tightening device is reduced, and the overall length of the filter press is reduced. Further, since the filter plate can be tightened and opened only with the filter plate tightening device, the filter plate opening device is not required, and the structure of the filter press can be simplified by that much, and the cost can be reduced. Things. In addition, since cake can be discharged between the other filter plates while filtering between the other filter plates, the filtration work efficiency can be drastically increased, and the time required for rough work can be reduced. Can be. As a result, the filter work is performed on the filter plate part where the filter press is located, and the cake discharge work is performed on the other filter plate parts. When these operations are completed, the cake discharge work is performed on the previous filter plate part. In this way, the filtration work can be performed almost continuously as a whole of the filter press, such as performing the filtration work in the subsequent filter plate, and the time before and after filtration in conventional batch filtration can be almost eliminated. Can be continuously discharged, and the cake can be efficiently treated. In addition, since the filter plate and the like move only one filter room,
The movement of each part such as the filter plate is reduced as compared with the conventional filter press, the consumption of parts is reduced, and the maintenance of the filter press becomes easy. Further, by providing two undiluted liquid communication conduits for supplying undiluted liquid between different filter plates, different undiluted liquids can be simultaneously filtered by one filter press.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below with reference to FIGS.
It will be described in detail based on. As shown in FIG. 1, the filter press according to the present embodiment includes front and rear fixed stands 1 and 2.
The supporting rails 3, 3 are fixed on both sides between them, and a plurality of, for example, four in FIG.
, 4 are fixed, and one movable filter plate 14 is arranged between the adjacent fixed filter plates 4, 4 so as to be movable in the front-rear direction with respect to the support rails 3, respectively, and integrally connected. The five movable filter plates 14,..., 14 are simultaneously moved forward or backward by the filter plate tightening devices 7, 8 arranged in front and rear, respectively, to perform the filter plate tightening or the filter plate opening operation. Like that.

As shown in FIGS. 1 to 4, each fixed filter plate 4
The support rails 3, 3 are fixed at least equidistantly between at least the adjacent fixed filter plate 4 by a dimension corresponding to the filter plate opening distance. Each fixed filter plate 4 is provided with a protruding handle 4h on each side thereof. The handle 4h is fitted into the notch 3h of each support rail 3 and fixed by bolts 20,. It has become. Each fixed filter plate 4 has a filter bed 4b recessed with respect to the frame portion 4a on the front and back surfaces thereof. On the bottom surface of each filtration bed 4b, for example, a number of projections for discharging the filtrate extending along the vertical direction are formed, so that the filtrate is discharged smoothly downward. A stock solution supply port 4c of a stock solution supply passage 4d is formed above the filtration bed 4b. The stock solution supply passage 4d is bent substantially in an L shape from the stock solution supply port 4c to open a stock solution supply opening 4g on the upper surface of the fixed filter plate 4. The stock solution supply opening 4g is connected to the stock solution communication conduit 9 or 10 by branching. The undiluted solution is supplied between the filter plates by being connected to the pipe 9a or 10a. A filtrate outlet 4e is opened at the lower end corner of the filter bed 4b of each fixed filter plate 4, and the filtrate is discharged downward from the filtrate discharge passage 4f through the filtrate outlet 4e. As shown in FIG. 3A, the filtrate discharged from each fixed filter plate 4 includes fixed filter plates 4,..., 4 and movable filter plates 14,.
Are received in pairs 5 and 5, which are arranged below, and are discharged out of the filter press. Further, a tray 6 for collecting the cake to be discharged from the filter cloth when the filter plate is opened is disposed further below the tors 5, 5 and further below the cake collected by the tray 6 outside the filter press. A conveyor for conveyance may be arranged.

[0008] A known filter cloth or filter plate cleaning device may be installed below the filter plate. In this case, it is preferable that the nozzle tube of the cleaning device is inserted between the filter plates or moved below the filter plate to be opened and closed according to the opening and closing operation of the filter plate. On the other hand, as shown in FIGS. 1 and 5 and 6, the movable filter plate 14 is spaced apart from the adjacent movable filter plates 14 at equal intervals by a dimension corresponding to a filter plate opening distance, and is provided on each side. The two are connected to each other by a total of four long connecting bodies 13,... Each movable filter plate 14 is provided with two upper and lower handles 14h, 14h protruding from each side thereof.
Is fitted into each notch 13h of each connecting body 13 and the bolt 2
1, ..., 21 and the movable filter plate 14,
, 14 are integrally movable together with the connecting members 13, ..., 13. The connecting bodies 13 on each side are
The support rails 3 are interposed and slidable above and below each support rail 3. Each movable filter plate 14 is provided with a filter bed 14
Having. On the bottom surface of each filtration bed 14b, for example, a large number of projections for discharging the filtrate extending in the vertical direction are formed, so that the filtrate is discharged smoothly downward. A filtrate outlet 14e is opened at the lower end corner of the filter bed 14b of each movable filter plate 14, and the filtrate is discharged downward from the filtrate discharge passage 14f through the filtrate outlet 14e. Each movable filter plate 1
The filtrate discharged from 4 is received at 5 and 5 shown in FIG. 3 (A) and discharged out of the filter press.

The material of the fixed filter plate 4 and the movable filter plate 14 is not only synthetic resin such as polypropylene resin, but also steel,
It is preferable to use a metal such as cast iron. In addition, each of the filter plates 4 and 14 may be provided with a pressed membrane. in this case,
The pressed membrane can exert not only a press filtration function but also a balancing action of the tightening pressure between the filter plates. The thickness of each filter plate 4 and 14 is the thickness of a normal filter plate, for example, 2 to 10 cm. However, depending on the filtering conditions, the thickness of the filter plate is increased to an appropriate thickness exceeding the above-mentioned thickness. The shape of the filter plate is the filter plate of a normal single type filter press, but the stock solution supply ports 4c, 1
4c may be provided on any of the upper, lower, left and right sides in addition to the center of the illustrated filtration beds 4b and 14b. Furthermore, each filter plate can be opened and closed without projecting the handle beyond the support rail to the outside of the frame supporting the filter plate. As a result, there is no projection outside the filter plate, and there is no danger due to contact even if the operator approaches the filter plate row when the filter plate is moved.

The filter bed 14b is not formed on the front surface of the movable filter plate 14 disposed at the front end of the five movable filter plates 14,... Drive rod is fixed. The filter plate tightening device 7 is composed of, for example, a hydraulic cylinder. The hydraulic cylinder is driven by a stroke corresponding to one chamber between adjacent filter plates, so that the movable filter plates 14,. All at once. This drive stroke is determined by the size of the filter plates and is adjustable. 5 above
The filter bed 14b is not formed on the rear surface of the movable filter plate 14 disposed at the rear end of the movable filter plates 14,. Has been fixed. The filter plate tightening device 8 is composed of, for example, a hydraulic cylinder. The hydraulic cylinder is driven by a stroke corresponding to one chamber between adjacent filter plates, so that the movable filter plates 14,. All at once. This drive stroke is determined by the size of the filter plates and is adjustable.

In the filter plate tightening devices 7 and 8, if it is preferable to widen the space between the filter plates for discharging the cake, a dimension for connecting the movable filter plate 14 to the connecting body 13 or a fixed filter for the support rail 3. The size for fixing the plate 4 is expanded as necessary. If the cake can be dropped sufficiently even with a smaller width, the above dimensions are reduced. On the other hand, the filter cloth sandwiched between the fixed filter plate 4 and the movable filter plate 14 is a known filter cloth suspending device, for example, a filter cloth hanging rod is suspended from a support standing on the filter plate by a suspension spring, and the filter cloth is suspended. A filter cloth may be hung on a cloth hanging rod and hung between filter plates. Alternatively, it may be suspended from an arm having one end rotatably connected to a fixed filter plate or a movable filter plate. Alternatively, the suspension may be suspended by using two stock solution communication conduits 9 and 10 for supplying the stock solution shown in FIG. Further, a known filter cloth vibrating device that applies vibration to the filter cloth may be provided.

The supply of the undiluted solution is performed in the same manner as the undiluted solution supply passage 4d penetrating from the outer periphery of each fixed filter plate 4 fixed to the support rails 3,. The undiluted solution is supplied from another undiluted solution supply passage 4d penetrating toward the filtration floor opposite to the fixed filter plate 4. A flange is attached to the outer periphery of the upper surface of the fixed filter plate 4 in each of the stock solution supply passages 4d, and the flange is connected to the branch pipes 9a and 10a of the stock solution communicating pipes 9 and 10 arranged in the row direction of the filter plates. They are connected by pipes. Each of the communication conduits 9 and 10 is connected to a stock solution tank (not shown) installed outside. The undiluted solution supply passage 4d may be formed so as to penetrate the movable filter plates 4 connected by the connectors 13,. A branch pipe 9a for connecting the flange at the outer peripheral end of the filter plate and the communication conduits 9 and 10,
10a is preferably a flexible tube.

The filtrate is discharged from each of the filtrate discharge ports 4e and 14e, which penetrate through the filtration floor of each of the filter plates 4 and 14 and open to the outer periphery. An open / close cock may be attached to the filtrate discharge passages 4f, 14f communicating with the respective filtrate discharge ports 4e, 14e.
Further, a filtrate receiver may be provided below the filtrate discharge passages 4f, 14f to collect the filtrate. In addition, each filter plate 4,1
A flexible tube may be connected to the filtrate discharge passages 4f, 14f of 4, and the filtrate may be collected at one end thereof and discharged.

In this embodiment having the above-described structure, a plurality of filter plates of the filter press are arranged and connected to every other one, and one of the connected filter plates, ie, the movable filter plates 14,... At the opening distance from the filter plates 4,..., 4, the movable filter plates 14,..., 1 are driven by the filter plate tightening device 8 as shown in FIG.
4 are simultaneously advanced with respect to the fixed filter plates 4,. Therefore, each movable filter plate 4 is advanced, and the front surface of each movable filter plate 14 is fastened to the rear surface of each fixed filter plate 14 adjacent to its front side via a filter cloth. Is opened between the rear surface of the fixed filter plate 14 and the front surface of another fixed filter plate 14 adjacent to the rear side. As a result, the front of each movable filter plate 4 and each fixed filter plate 14
The undiluted solution is supplied from the branch pipe 9a of the undiluted solution communication conduit 9 through the undiluted solution supply passage 4d between the pair of filter cloths between the undiluted filter cloth and the
Filtration is performed. On the other hand, the cake between a pair of filter cloths located between the rear surface of the opened movable filter plate 14 and the front surface of the fixed filter plate 4 is discharged, and the filter cloth washing and the like are appropriately performed.

After the filtration is completed, the movable filter plates 14,..., 14 are simultaneously driven by the filter plate tightening device 7 to fix the fixed filter plates 4,. Retreat to 4. Therefore, each movable filter plate 4 is retracted, and the rear surface of each movable filter plate 14 is fastened to the front surface of each fixed filter plate 14 adjacent to the rear side thereof via a filter cloth. Is opened between the front surface of the fixed filter plate 14 and the rear surface of another fixed filter plate 14 adjacent to the front side. As a result, between the pair of filter cloths between the rear surface of each movable filter plate 4 and the front surface of each fixed filter plate 14, the stock solution is supplied from the branch pipe 10a of the stock solution communication conduit 10 via the stock solution supply passage 4d, Filtration is performed. On the other hand, the cake between a pair of filter cloths located between the front surface of the opened movable filter plate 14 and the rear surface of the fixed filter plate 4 is discharged, and the filter cloth washing and the like are appropriately performed. By repeating these operations, 1
In one filter press, the cake discharge and the washing of the filter cloth can be performed continuously and simultaneously between the other filter plates while performing the filtering operation of filtering the undiluted solution between the filter plates and collecting the filtrate.

According to the above embodiment, the rows of the first filter plates (for example, the movable filter plates 14,..., 14) and the rows of the second filter plates (for example, the fixed filter plates 4,..., 4) are arranged. Since the filter plates are simultaneously opened and closed, no matter how many filtration chambers are formed between the filter plates, if the filter plate clamping devices 7 and 8 are driven for a stroke of one filter chamber, the filter plates can be tightened and filtered. The plate can be sufficiently opened. Therefore, the driving distance of the filter plate tightening devices 7 and 8 is reduced, and the overall length of the filter press is reduced. Further, since the filter plate can be tightened and opened only with the filter plate tightening devices 7 and 8, the filter plate opening device is not required,
Accordingly, the structure of the filter press can be simplified and the filter press can be made inexpensive. In addition, since the filter plate and the like are moved by one filter chamber, the movement of each part of the filter plate and the like is reduced as compared with the conventional filter press, the consumption of parts is reduced, and maintenance of the filter press is reduced. Becomes easier. In addition, since cake can be discharged between the other filter plates while filtering between the other filter plates, the filtration work efficiency can be drastically increased, and the time required for rough work can be reduced. Can be. As a result, the filter work is performed on the filter plate part where the filter press is located, and the cake discharge work is performed on the other filter plate parts. When these operations are completed, the cake discharge work is performed on the previous filter plate part. In this way, the filtration work can be performed almost continuously as a whole of the filter press, such as performing the filtration work in the subsequent filter plate, and the time before and after filtration in conventional batch filtration can be almost eliminated. Can be continuously discharged, and the cake can be efficiently treated.

Furthermore, since two stock solution communication conduits 9 and 10 for supplying stock solutions to different filter plates are provided, different stock solutions can be simultaneously filtered by one filter press. Note that the present invention is not limited to the above-described embodiment, and can be implemented in various other modes. For example, only one of the filter plate tightening devices 7 and 8 is provided, and only the one filter plate tightening device is used.
, 14 are moved back and forth, the movable filter plates 14,..., 14 are pushed and fastened to the fixed filter plates 4,..., 4 and the space between the fixed filter plates that have been tightened up to that time is opened. On the contrary, the movable filter plates 14,.
4 and the space between the filter plate 4 and the fixed filter plate 4 which has been opened up to that time may be tightened. Further, the respective filter plate tightening devices 7 and 8 do not directly push and pull the movable filter plate 14, but the movable filter plates 14,.
, 13 are pushed and pulled to move the movable filter plate 1
4,..., 14 may be moved simultaneously. In addition, the support rails 3,..., 3 are movable with respect to the front and rear stands 1, 2, and the fixed filter plates 4,. 4 is connected to the tightening devices 7 and 8, and the movable filter plates 14,.
The fixed filter plates 4,..., 4 may be moved relative to 4 to open and close the filter plates. Alternatively, the fixed filter plate 4 and the movable filter plate 14 may be movable, and one of them may be moved relative to the other, or both may be moved to perform the same operation. Good.

The connection relationship between the fixed filter plate 4 and the support rail 3 and the connection relationship between the movable filter plate 14 and the connection member 13 are cut at predetermined positions of the support rail 3 or the connection member 13 as described above. In addition to the above, the filter plate is fitted, and a protruding piece or the like is provided on the support rail or the coupling body side, and this is fitted on the filter plate side. . Further, each of the filter plates may be attached to the support rail or the connecting body so as to be movable and adjustable so that the interval between adjacent filter plates can be adjusted. The structure of the filter plate is
A plurality of filter plates, for example, two compressed filter plates and a normal filter plate may be interposed between the movable filter plate and the fixed filter plate. Further, the structure of the filter plate is not limited to the single type filter press shown in the drawing, and a frame is sandwiched between adjacent filter plates, and one filter cloth is sandwiched between each filter plate and the frame to perform filtration. It may be a double filter press. In this case, in order to drive the frame, the frame and the filter plate adjacent to the frame may be connected by a chain or the like, or a dedicated driving device for the frame may be provided.
Also, the filter plate of the filter press is not limited to being divided into two filter plate rows, but may be divided into three or more rows, and each of the filter plates may be driven to be fastened and opened by a filter plate fastening device.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a filter press according to one embodiment of the present invention.

FIG. 2 is a side view of a fixed filter plate row of the filter press.

3A is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 3B is a rear view of the fixed filter plate row as viewed from the line BB in FIG.

FIG. 4 is a plan view of a fixed filter plate row of the filter press.

5A is a side view of a movable filter plate row of the filter press, and FIG. 5B is a cross-sectional view taken along line CC of FIG. 5A.

6 (A) is a plan view of a movable filter plate row of the filter press, and FIG. 6 (B) is a rear view adjacent to the movable filter plate as viewed from the line DD in FIG. 6 (A). It is.

FIG. 7 is a side view of the filter press.

8 is a rear view of the filter press, as viewed from the line EE in FIG. 7;

FIG. 9 is a plan view of the filter press.

[Explanation of symbols]

1,2 ... front and rear fixed stand, 3 ... support rail, 3h, 1
3h ... notch, 3b ..., 4 ... fixed filter plate, 4a, 14a
... frame part, 4b, 14b ... filtration bed, 4c ... stock solution supply port, 4
d: stock solution supply passage, 4e, 14e: filtrate outlet, 4f,
14f: Filtrate discharge passage, 4g: Undiluted solution supply opening, 4h: Handle, 5 ..., 6 ... Receiving tray, 7, 8 ... Filter plate tightening device,
9, 10 ... undiluted liquid communication conduit, 9a, 10a ... branch pipe, 13
... Connected body, 14 ... Movable filter plate, 20, 21 ... Bolt.

Claims (6)

(57) [Claims] 1. A filtration bed (4b) on each of the front and back surfaces
A plurality of fixed filter plates (4) which are arranged at least at intervals of the filter plate opening plate and are integrally connected to each other by opening a stock solution supply passage (4d) for supplying a stock solution to each filter bed (4b). And a movable filter plate (14) which is movably disposed one by one between the fixed filter plates (4) and is integrally movably connected to each other, and has filter beds (14b) on the front and rear surfaces, respectively. ), A filter cloth disposed between the adjacent fixed filter plate (4) and the movable filter plate (14), and one of the front and back surfaces of each movable filter plate (14) facing each other. The movable filter plate (14) is integrally moved so that it can be filtered so that the filter cloth is interposed between the fixed filter plate (4) and the front and back surfaces of the movable filter plates (14). Open between the fixed filter plate (4), the other side of which faces the other side On the other hand, the other one of the front and back surfaces of each of the movable filter plates (14) is filterably fastened to the opposed fixed filter plate (4) with the filter cloth interposed therebetween, and at the same time, each of the movable filter plates (14) is The movable filter plate (14) is integrally moved so as to open between the one of the front surface and the back surface of the plate (14) and the fixed filter plate (4) whose one surface is opposed. A filter press comprising a movable filter plate tightening device (7, 8). 2. The movable distance of the movable filter plate (14) is an open plate distance between the movable filter plate (14) and a fixed filter plate (4) adjacent to the movable filter plate. The described filter press. 3. The filter bed (4) on the surface of the fixed filter plate (4).
a stock solution communication conduit (9) for supplying a stock solution to the filter cloth located on the b) side through the stock solution supply passage; and the filter located on the filter bed (4b) side on the back surface of the fixed filter plate (4). The filter press according to claim 1 or 2, further comprising a stock solution communicating conduit (10) for supplying stock solution to the cloth via the stock solution supply passage. 4. A filter bed (4b) on each of the front and back surfaces
A plurality of first filter plates (4) arranged at least at intervals of the filter plate opening intervals and integrally connected to each other, and disposed one by one between the first filter plates (4) and integrated with each other And a second filter plate (14) having a filter bed (14b) on each of the front and back surfaces, and disposed between the adjacent first filter plate (4) and second filter plate (14). The filter cloth to which the undiluted solution is supplied, and the first filter plate (4) whose one surface of the front and back surfaces of each second filter plate (14) faces each other are fastened with the filter cloth interposed therebetween. First, the first filter plate (4) is replaced with the second filter plate (1).
4) While the filter cloth is moved integrally and relatively to the first filter plate (4), the other of the front and back surfaces of the second filter plates (14) is opposed to the filter cloth. And a filter plate tightening device (7, 8) for integrally moving the first filter plate (4) with respect to the second filter plate (14) so that the first filter plate (4) is tightened with the intermediary of the first filter plate (4). A filter press characterized by the above. 5. The first filter plate (4) and the second filter plate (14).
The filter press according to claim 4, wherein the relative movable distance between the first filter plate (4) and the second filter plate (14) is an open plate distance. 6. A filter bed (4) on the back surface of said first filter plate (4).
b) and the filter bed (14b) on the surface of the second filter plate (14)
A raw liquid communication conduit (9) for supplying a raw liquid to the filter cloth interposed between the first filter plate (4) and the filter bed (4b) on the surface of the first filter plate (4);
The filter according to claim 4 or 5, further comprising a stock solution communication conduit (10) for feeding stock solution to the filter cloth interposed between the filter plate (14) and a filtration bed (14b) on the back surface of the filter plate (14). press.