JPH0367721B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a filter press that applies vibration to a filter cloth to remove filter residue adhering to the filter cloth.

BACKGROUND ART Conventionally, filter presses of this type are known with various structures. For example, a vibration device movable in the front and back direction is placed above a large number of filter plates arranged between the front and rear stands, and when the filter plates are opened,
The vibrating device is positioned above the opened filter plate, and the vibrating plate of the vibrating device knocks down the filter cloth hanging rod supported by the filter plate to vibrate the filter cloth hanging rod supported by the filter cloth hanging rod. Some filters are designed to peel off filter residue adhering to the filter cloth.

Problems to be Solved by the Invention However, with the structure described above, the filter cloth is only swung in the vertical direction by the vibration device. The drawback was that it was sometimes impossible to remove the filter cloth from the filter cloth.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a filter press that can effectively remove filter sludge that has gotten into the holes of the filter cloth.

Means for Solving the Problems In order to achieve the above object, the present invention applies vibration to a pair of filter cloths disposed before and after a filter plate while expanding the filter cloths outward from the inside of the filter cloths. The filter was configured to remove filter residue adhering to the filter cloth. That is, after a filter cloth is suspended and supported between adjacent filter plates by a filter cloth hanging member and the stock solution is filtered by the filter cloth,
A filter press in which the filter plate is opened along the front-rear direction and vibration is applied to the filter cloth to remove filter residue attached to the filter cloth, the filter press is rotatably supported by the filter plate, and a rotary member disposed between the pair of filter cloths disposed before and after the filter cloth and rotatably driven manually or by a vibration driving means; The apparatus is configured to include a swinging member that expands the cloth so as to inflate it from the inside to the outside.

In the above configuration, the rotating member includes a rotating rod rotatably supported by the filter plate, and the swinging member is fixed to the rotating rod via a pair of arms and rotates integrally with the rotating rod. It can also be constructed from a swinging rod.

Further, in the above configuration, the rotating member is a rotating rod, and the swinging member is integrally fixed to an intermediate portion of the rotating rod, and is eccentric from the center of rotation of the rotating rod, and is attached to the filter cloth. It can also be configured to include a swinging part that contacts the inner surface and expands the filter cloth from the inside to the outside.

Moreover, in the said structure, the said rotating member can also be comprised so that it may be supported by the said filter plate so that it may be arrange|positioned above the said filter plate.

Further, in the above configuration, the rotating member may be disposed within the filtration portion of the filter plate, and the swinging member may be configured to contact the inner surface of the filtration portion of the filter cloth.

Furthermore, in the above configuration, an automatic filter plate feeding device for feeding each of the filter plates in the front and back direction is provided, and
The vibration driving means may be arranged to be attached to the filter plate and to be removably connected to the rotary member.

Effect of the Invention In the above configuration, after filtering the stock solution with each filter cloth, the filter plate is moved to a predetermined position, and then the rotating member is rotated manually or by a vibration drive means,
A rocking member fixed to the rotating member is rotated around the rotation axis of the rotating member. This rotation brings the swinging member into contact with the inner surface of each filter cloth, vibrates the filter cloth while expanding it from the inside to the outside, and vibrates the filter cloth approximately in the vertical direction and approximately in the front-rear direction. Remove the attached filter residue. In the case where the swinging member is disposed above the filter plate, the swinging member contacts the inner surface of the filter cloth located above the filter plate, causes vibration in the filter cloth, and causes the filter cloth to Remove the filter residue. Further, in the case where the rocking member is disposed in the filtering portion of the filter plate, the rocking member contacts the inner surface of the filtering portion of the filter cloth located in the filtering portion of the filter plate, causing vibration in the filter cloth. Remove the filter residue from the filter cloth. The filter residue removal operation can also be performed while the filter plate is moving to a predetermined opening position.

Effects of the Invention According to the above configuration, the filter cloth is expanded by the swinging member so as to swell from the inside to the outside, and vibration is applied to the filter cloth, so that the filter residue clogged in the holes of the filter cloth can be removed. Due to the expansion and vibration action of the swinging member, the filter sludge that is clogged in the holes of the filter cloth can be effectively removed by being blown outward, thereby improving the filter sludge removal efficiency. .

Further, in the above configuration, if the rotating member is arranged within the filtration part of the filter plate and the swinging member is configured to contact the inner surface of the filtration part of the filter cloth, the filtration part of the filter cloth can be directly Since the rocking member expands the filter cloth so that it swells from the inside to the outside, it becomes easier to remove the filter residue stuck to the filtration part of the filter cloth, and the filter residue can be removed more effectively. The removal rate can be further improved.

Examples Examples according to the present invention will be described in detail below with reference to FIGS. 1 to 12.

The schematic structure of the filter press according to this embodiment is shown in FIGS. 1 to 3. This filter press has a large number of filter plates 1,..., 1 arranged between front and rear stands (not shown) so as to be movable back and forth, and a pair of filter cloths between the filter plates 1, 1 above each filter plate 1, 1. A filter cloth hanging rod 2 is provided as a filter cloth hanging member for suspending and supporting the filter plates 1, 5, respectively, and the movable plate is moved to suspend and support the plurality of filter plates 1, . . .
1 is closed, and a pair of filter cloths 5, 5 are placed between each filter plate 1, 1.
In between, the stock solution is supplied and filtration is performed. On the other hand, the movable plate is moved in the opposite direction to the above, and the filter plates 1, . In addition to removing the retained filter residue, vibration is applied to each of the filter cloths 5 by a vibration driving device 14 as a vibration driving means, and the filter residue adhering to the filter cloths 5 is removed.

The filter plate 1 is made of a frame body 1b,
Both sides of the upper end of the frame 1b are provided with handles 1a, 1a that protrude in the lateral direction, and each handle 1a is suspended from each filter plate guide member 4 installed between the front and rear stands so as to be slidable back and forth. The filter plate 1 is hung and supported to guide the movement of each filter plate 1.

A fixing rod 1d is fixed to the lower end of each of the filter cloths 5, and the fixing rod 1d is locked between support fittings 1c fixed to both sides of the lower part of the frame 1b of the filter plate 1.

Cylindrical supports 3, 3 are fixed to predetermined locations on the upper surface of both handles 1a, 1a of each filter plate 1 so as to protrude upward, and a guide rod 8 is erected on the top of each support 3. A coil spring 9 is fitted to the outside of the guide rod 8, a shaft support member 6 is fixed to the upper end of the coil spring 9, and the shaft support member 6 is attached to the guide rod 8 so as to be movable along the axial direction thereof. . One end of the filter cloth hanging rod 2 is fixed to this shaft support member 6, and the filter cloth hanging rod 2 is guided by the guide rods 8, 8 in the vertical direction against the urging force of the coil springs 9, 9. Make it possible to move.

a pair of filter cloths 5 located above the filter plate 1 and opposing each other with the filter plate 1 in between;
5, a swing mechanism 30 is rotatably attached.

The swinging mechanism 30 includes a rotating member and a swinging member. The rotating member includes the supports 3, 3
Rotating rod 1 rotatably attached to each intermediate part of
Consists of 0. The swinging members include arms 7, 7 whose central parts are fixed at both ends of the rotating rod 10 and near the support body, and swinging members fixedly or rotatably attached to the tip of each arm 7. Bars 11, 12
It becomes more. One end of the rotary rod 10 passes through the support 3, and a clutch lever 21 is fixed to the end surface thereof. The clutch lever 21 is constituted by a lever fixed to the end surface of the rotary rod 10 in a direction orthogonal to the axis. On the other hand, the other end of the rotary rod 10 passes through the support 3 and has a lever 27 fixed to its end surface, and a coil spring 28 is stretched between the lever 27 and the handle 1a. Thus, a downward biasing force is always applied to the rotary rod 10 so that the rotary rod 10 rotates stably. The biasing force of the coil spring 28 is such that it does not inhibit the rotation of the rotary rod 10, and when the lever 27 rotates together with the rotary rod 10, the coil spring 28 repeatedly expands and contracts. This rotation of the rotating rod 10 causes the swinging rods 11, 12 to rotate around the center of rotation of the rotating rod 10 via the arms 7, 7, so that the swinging rods 11, 12 move the filter cloths 5, 12 , and applies vibration to the filter cloths 5, 5 while inflating and expanding the filter cloths 5, 5 from the inside to the outside.

On the other hand, the guide members 4, 4 are respectively installed on both sides between the front and rear stands of the filter press. The main body 4c of each guide member 4 has an L-shaped longitudinal section, and a protrusion 4b extending in the front-rear direction and having a rectangular cross-section is fixed to the outer surface along the vertical direction, and the upper surface of the protrusion 4b has a rectangular cross-section. Fix the guide rail 4a. Within both guide rails 4a, 4a, the known automatic filter plate feeding devices 25, 25 move synchronously in the front and rear directions, respectively, and when the frame is opened, the handle 1 of the filter plate 1 is moved.
a and 1a, respectively, to feed the filter plates 1 one by one in the front-rear direction to the open frame position. The vibration drive device 14 is attached to one of the moving feed devices 25. That is, in this vibration drive device 14, a support frame 24 having a "T" shape in longitudinal section is fixed to the automatic feed device 25, and a motor 23 is mounted on the outer surface of the support frame 24.
is fixed, and rollers 26, 26 are provided at the lower end thereof to run on the upper surface of the lower end portion of the main body 4c of the guide member 4. Therefore, when the automatic feeding devices 25, 25 move in the front and back direction guided by the guide members 4, 4, the vibration drive device 14 attached to one of the automatic feeding devices 25 moves as shown in FIG. It moves in the front and back direction together with the automatic feeder 25. On the other hand, an air cylinder 18 for clutch actuation is attached to the upper end of the support frame 24 so as to be rotatable with respect to the support frame 24.
A locking piece 20 is fixed to the tip of the piston 18a. The air cylinder 18 has a pulley 15 fixed to the outer circumferential surface of the part of the support frame 24 that protrudes toward the inner surface, and a pulley 16 that is fixed to the drive shaft of the motor 23 that protrudes toward the inner surface of the support frame 24. 1
5 and 16 on the belt 17, and the motor 2
3, the air cylinder 18 is moved to the support frame 24 via the pulley 16, belt 17, and pulley 15.
so that the locking piece 20 rotates. The locking piece 20 is connected to the piston 18a.
A lever is fixed in a direction orthogonal to the axial direction of the lever, and both ends of the lever are provided with rising locking portions, and the clutch lever 21 and the clutch lever 21 constitute a clutch. Therefore, the locking portion of the locking piece 20 engages with the clutch lever 21, so that the rotational force of the locking piece 20 is transmitted to the rotating rod 10. In FIG. 1, 19 is an air supply pipe that supplies air to the air cylinder 18, and 22 is a power distribution line connected to the motor 23.

According to the above configuration, filtration is performed by supplying the stock solution between the pair of opposing filter cloths 5, 5 between the adjacent filter plates 1, 1. When this filtration process is completed, the automatic feeding devices 25, 25 are synchronously driven to move along the guide members 4, 4, and the filter plates 1 are moved one by one in the mold opening direction. Do the frame. At this time, the filter plate 1 is temporarily stopped slightly before the predetermined frame opening position by the automatic feeding devices 25, 25, and the vibration drive device 14
The air cylinder 18 is driven to move the locking piece 20 toward the clutch lever 21 and position it at an engageable position. Then, the motor 23 is driven to rotate the air cylinder 18 with respect to the support frame 24, and the rotating rod 10 is rotated via the locking piece 20 and the clutch lever 21. When the rotary rod 10 rotates, the swing rods 11 and 12 connected by the arms 7 and 7 rotate counterclockwise between the pair of filter cloths 5 and 5, as shown in order from a to e in FIG. do. As a result, both the swing rods 11, 12 hit the inner surfaces of the filter cloths 5, 5, and apply vibration to the filter cloths 5, 5 while inflating and expanding the filter cloth 5 from the inside to the outside. When the filter cloths 5, 5 bulge outward by the two swing rods 11, 12 and the gap between the filter cloths 5, 5 is widened in the front and back direction, the filter cloth hanging rod 2 is moved by the biasing force of the coil springs 9, 9. In response, the shaft support members 6, 6 descend, and the filter cloth hanging rod 2 also moves up and down. As a result, the filter cloths 5, 5 swing substantially upward and downward and substantially forward and backward, respectively, and the filter residue adhering to the filter cloth 5 is shaken off.

According to the above embodiment, each filter cloth 5 is inflated and expanded from the inside to the outside by the two rocking rods 11 and 12 while applying vibration to the filter cloth 5. The filter sludge clogged in the eyes is thrown outward by the rotation of the rocking rods 11 and 12, and the filter sludge clogged in the eyes of the filter cloth 5 can also be effectively removed. Removal efficiency can be improved. The length of the arms 7, 7, the rotation speed of the swing mechanism 30, the swing rods 11, 12
By adjusting the rotation range, etc., the filter residue removal effect can be adjusted as desired.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various other embodiments.

For example, when the filter plate frame is opened, the automatic feeding device 25,
While the filter plate 1 is being fed to the open frame position in step 25, the vibration driving device 14 may rotate the rotary rod 10 to vibrate the filter cloths 5, 5. In this way, the filter residue can be removed from the filter cloth 5 within the feeding time of the filter plate 1, and the efficiency of operation of the entire filter press can be increased.

Further, when the coil springs 9, 9 are provided at the lower part of the filter plate 1 and the filter cloths 5, 5 are vibrated by the swinging mechanism 30, the lower end of the filter cloth 5 resists the biasing force of the coil springs 9, 9. It may also be made to rise.

Moreover, although the filter plate 1 is constructed of the frame body 1b, it is not limited thereto, and may have any structure, such as one having a well-known filter bed.

In addition, the locking piece 20 and the clutch lever 21
The clutch mechanism may be configured using levers combined in a cross shape, and is not limited to this, and a known clutch mechanism may be used.

Further, although it is preferable that the lower end of the filter cloth 5 is locked as shown in the figure, the present invention is not limited to this, and the lower end of the filter cloth 5 may be formed at a free end without being fixed to the filter plate 1.

Further, as shown in FIGS. 4 and 5, the swing mechanism 30 may be replaced by another swing mechanism 37 using a crank mechanism. That is, the handles 1a, 1a of the filter plate 1 are provided with supports 3 bent outward with respect to the filter plate 1, instead of the supports 3, 3.
1 and 31 are fixed, and a coil spring 3 is attached to the upper end of this.
2, 32 to a filter cloth suspension string, e.g. wire 33
is stretched out, and the filter cloths 5, 5 are suspended and supported from this wire 33. And the supports 31, 31
Between the filter cloths 5 and 5, a crank rod 34 whose middle portion is bent with respect to both ends is attached to the support 3.
1, 31 so that it can rotate freely. Both ends of the crank rod 34 function as rotating members,
The intermediate portion functions as a swinging portion 34c as a swinging member. One end of the crank rod 34 passes through the support 31 and is provided with a connecting portion 34a having a rectangular cross section on its end surface. On the other hand, the vibration drive device 14 connects the connecting portion 34 to the piston 18a of the air cylinder 18.
A fitting part 36, which is removably fitted to the connecting part 34a, is fixed to form a clutch between the connecting part 34a and the fitting part 36. The other end of the crank rod 34 passes through the support 31, and then a manual lever 35 is attached to the end 34b, and the crank rod 34 is manually rotated to impart swing to the filter cloths 5, 5. Configure it so that you can.

The function of the filter cloths 5, 5 according to this embodiment is shown in FIG. The filter cloths 5, 5 are rotated by the swinging mechanism 37 or manually, so that the swinging portion 34c of the crank rod 34 is rotated around the shafts at both ends of the crank rod 34 as shown in a to i in the figure. The filter cloths 5, 5 are swung repeatedly within a range of 180 degrees from the lower side to inflate and expand the filter cloths 5, 5 from the inside to the outside, while applying vibrations to the filter cloths 5, 5, thereby removing the filter residue from the filter cloths 5, 5. remove. The filter cloths 5, 5 are connected to the coil spring 3.
By bending the wire 33 against the biasing forces of 2 and 32, it freely swings substantially vertically and substantially longitudinally. According to this configuration, the structure is simpler than that of the filter press shown in FIGS. 1 to 3, and can be manufactured at low cost.

In yet another modification, the vibration drive device 14 may be arranged to move in the front-rear direction independently of the automatic feed device 25.

Further, the swinging mechanism 30 is disposed within the space 1f of the filtering portion of the filter plate 1, and the swinging member is arranged in the filter cloth 5.
The filter may be brought into contact with the inner surface of the filter section.

That is, as shown in FIGS. 7 to 11, the filter plate 1
The rotary rod 10 is arranged in a space 1f inside the frame, and its both ends are rotatably supported by bearings 1e and 1e inside the frame 1b, respectively. The rotating rod 10 is composed of a cylindrical portion 10b and a bearing 10 fitted into one end of the cylindrical portion 10b, and both are fixed with bolts 45 so as to rotate integrally. The cylindrical portion 10b is provided in the space 1 in the frame 1b.
f, and as shown in FIG. 11, both ends thereof are the bearing parts 1e,
1e, respectively rotatably supported. Each bearing part 1
e is provided with a circular recess 1h, into which the cylindrical portion 10b is rotatably fitted, and the cylindrical portion 1
A cylindrical seal member 40 is fitted between 0b and the recess 1h, and a stopper 41 prevents the seal member 40 from coming off. This sealing member 40 is for preventing filter residue and the like from entering the recess 1h, and does not prevent rotation of the rotary rod 10. One of the bearing parts 1e has a through hole 1g having a smaller diameter than the recess 1h formed at the bottom of the recess 1h. The through hole 1g is formed to also penetrate the frame 1b. The shaft portion 10c, which is fitted into and fixed to one end of the cylindrical portion 10b of the rotary rod 10, is rotatably inserted into the through hole 1g, and the end thereof is exposed to the outside of the filter plate. A bearing made up of balls 44, . . . , 44 and a pressing plate 42 is provided on the inner circumferential surface of the end of the through hole 1g to rotatably support the shaft portion 10c. A connecting portion 10a having a square cross section is formed at the end of this shaft portion 10c. Also in this embodiment, the vibration drive device 14 is connected to the guide member 4.
The connecting portion 10 is disposed so as to be movable back and forth along the piston 18a of the air cylinder 18.
The connecting portion 10a and the fitting portion 36 form a clutch by fixing the fitting portion 36 which removably fits into the connecting portion 10a. Note that a manual lever is attached to the one end of the rotary rod 10 in the same manner as in the above embodiment, so that the rotary rod 10 can be manually rotated to impart rocking to the filter cloths 5, 5. You may. The mounting structure of the filter plate and filter cloth in the embodiment shown in FIGS. 7 to 12 above is the same as that in the embodiment shown in FIG. 4 above. Also,
In the figure, 5a is an opening of the filter cloth 5 for supplying the stock solution.

With this configuration, the basics are substantially the same as in the above embodiment, but since the swinging mechanism 30 is arranged in the filtering part of the filter plate 1, the arms 7, 7 are moved by the rotation of the rotating rod 10. The swinging rods 11 and 12 rotate around the rotation axis of the rotating rod 10 through the swinging rod 1.
1 and 12 are in contact with the inner surfaces of the filtering portions of the filter cloths 5 and 5 located in the filtering portion of the filter plate 1, respectively, and the filter cloths 5 and 5
Vibrations are generated to remove filter residue from the filter cloths 5, 5. In this case, the rocking rods 11 and 12 directly contact the filtration portion of each filter cloth 5 to which filter residue is attached, and rock each filter cloth 5 so that it swells from the inside to the outside. Since the filter cloths 5, 5 are expanded by the rods 11, 12 and vibrated,
The filter residue that was stuck in the holes of the filter cloths 5, 5 was also blown outward by the expansion and vibration action of the rocking rods 11, 12, and the filter residue was stuck in the holes of the filter cloths 5, 5. Filter residue can also be effectively removed, and the filter residue removal efficiency can be further improved.

In addition, in the embodiment shown in FIGS. 7 to 11 above, as shown in FIG.
A groove 10d is formed near the end of the groove 1.
By fitting the semicircular pressing plate 42 into the shaft portion 0d, it is possible to prevent the shaft portion 10c from coming off in the axial direction. In addition, if this retaining structure is applied to both ends of the rotary rod 10, both ends of the rotary rod 10 are exposed to the outside of the filter plate from the frame 1b, and the retaining plates 42, 42 prevent the rotary rod from coming off. By holding it, the rotating rod 10 can be prevented from coming off on both sides in the axial direction, and at the same time, the frame body 1 can be
b is tightened from both sides, and it is possible to prevent the frame body 1b from expanding along the axial direction of the rotary rod 10 when filtration pressure is applied.

[Brief explanation of drawings]

1 and 2 are respectively a front view of a filter plate of a filter press according to an embodiment of the present invention and a side view of essential parts of the filter press, and FIG. 3 is an explanatory view showing the movement of the filter cloth of the filter press. Figures 4 and 5 are a front view of a filter plate of a filter press according to another embodiment and a side view of a main part of the filter press, respectively, Figure 6 is an explanatory diagram showing the movement of the filter cloth of the filter press, and Figures 7 to 1
Figure 1 is a front view of a filter plate of a filter press according to another embodiment, a side view of a main part, an explanatory view showing the movement of a filter cloth when the arm is rotated 90 degrees from the state shown in Figure 8, and a filter plate. A front view of the main body and an enlarged sectional view of the main part of the support part of the rotary rod, and FIG. 12 is an enlarged sectional view of the main part showing a modification of the embodiment shown in FIG. 11. DESCRIPTION OF SYMBOLS 1... Filter plate, 1a... Handle, 2... Filter cloth hanging member, 3... Support body, 4... Filter plate guide plate member, 4a
...Rail, 4b...Protrusion, 5...Filter cloth, 6...
...Shaft support member, 7... Arm, 8... Guide rod, 9
...Coil spring, 10...Rotating rod, 11, 12...
... Rocking rod, 14 ... Vibration device, 15, 16 ... Pulley, 17 ... Belt, 18 ... Air cylinder,
19... Air supply pipe, 20... Locking piece, 21...
Clutch lever, 22... Distribution line, 23... Motor, 24... Support frame, 25... Automatic filter plate feeding device, 26... Roller, 27... Lever, 28...
Coil spring, 30... Swing mechanism, 31... Support body, 32... Support coil spring, 34... Swing rod,
34a... Connecting portion, 34c... Swinging portion, 35...
Manual lever, 36... Fitting portion, 37... Rocking mechanism, 40... Seal member, 41... Stopper, 4
2... Holder plate, 43, 45... Bolt, 44...
…ball.

Claims (1)

[Scope of Claims] 1. A filter cloth 5 is suspended and supported between adjacent filter plates 1, 1 by a filter cloth hanging member 2, and after filtering the stock solution through the filter cloth 5, the filter plates 1, 1 are moved back and forth. In a filter press that opens along the direction and applies vibration to the filter cloth 5 to remove filter residue attached to the filter cloth 5, the filter press is rotatably supported by the filter plate 1 and is rotatably supported by the filter plate 1. The pair of filter cloths 5, 5 arranged in front and behind each other
Rotating members 10 and 34 are disposed between the rotating members 10 and 34 and are rotationally driven manually or by the vibration driving means 14, and a rotating member 10 and 34 is fixed to the rotating members 10 and 34 and is in contact with the inner surface of the filter cloth 5 to cause the filter cloth 5 to Swinging members 11, 12, which are expanded so as to inflate from the inside to the outside;
A filter press characterized by comprising: 34c. 2 The rotating member is composed of a rotating rod 10 rotatably supported by the filter plate 1, and the swinging member is fixed to the rotating rod 10 via a pair of arms 7, 7 and is integral with the rotating rod 10. Rocking rod 1 that rotates
Claim 1 consisting of 1 and 12
The filter press described in section. 3 The rotating member includes a rotating rod 34, and the swinging member is integrally fixed to the middle portion of the rotating rod 34, is eccentric from the center of rotation of the rotating rod 34, and is located on the inner surface of the filter cloth 5. The filter press according to claim 1, further comprising a swinging portion 34c that contacts the filter cloth 5 and expands the filter cloth 5 so as to swell it from the inside to the outside. 4. Claim 1, wherein the rotating member is supported by the filter plate so as to be disposed above the filter plate.
The filter press according to any one of items 1 to 3. 5. The filter according to any one of claims 1 to 3, wherein the rotating member is disposed within the filtering portion of the filter plate, and the swinging member is in contact with the inner surface of the filtering portion of the filter cloth. press. 6 An automatic filter plate feeding device 25 for feeding each of the filter plates 1 in the front and back direction is provided, and the vibration drive means 1
6. The filter press according to any one of claims 1 to 5, wherein 4 is attached to the filter plate and is detachably connected to the rotating members 10 and 34.