JPH04322706A - Filter plate of filter - Google Patents

Abstract

PURPOSE:To smoothly discharge filtrate even if a filter medium is clogged pressed against a recessed part of a filter plate by a clogging member in filtering by forming a filtrate discharging groove in the bottom of the recessed part of the filter plate in which the clogging member is put. CONSTITUTION:In the bottom of recessed parts 20a, 20b of a filter plate 20 against which a clogging member is pressed through a filter medium, is formed filtrate discharging grooves 20d. Filtrate discharged from the filter medium is introduced downward by the surface of a pressing plate and by filtrate discharging grooves 20d in the bottom of a recess 20c of the filter plate 20. The pressing part is inserted into the lower recessed part 20a of the filter plate 20 in the lower end part of the filter plate 20 through the lower end part of the filter medium. However, since the filtrate discharging grooves 20d are formed in the bottom of the recess 20a of the filter plate 20, the filtrate passes through the filtrate discharging grooves 20d between the filter medium passed against the filter plate 20 by pressing plate and the bottom of the filter plate 20 to smoothly discharge downward.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter plate used in a filter machine in which a cylindrical filter medium is closed in a bag shape and then a stock solution is supplied into the filter medium to perform filtration.

0002

2. Description of the Related Art Hitherto, various structures of this type of filter have been proposed. For example, after pressing the lower end opening of a cylindrical filter material toward the filter plate with a closing rod to close it and make it into a bag shape,
The stock solution is supplied from the opening at the upper end, and the press plate is moved horizontally to press the filter medium against the filter plate, and the cake inside the filter medium is filtered between the filter plate and the press plate.After filtration, the bottom end of the filter medium is Some filters are constructed so that the cake inside the filter medium can be discharged by opening the opening.

0003

[Problems to be Solved by the Invention] However, in the structure described above, a recess for fitting the closing rod is formed in the lower part of the filter plate, but the closing rod is inserted into the recess through the filter medium. If it is pressed, the filtrate discharged from the filter medium above the recess to the filter plate side will accumulate between the closing rod and the bottom of the recess, which may cause problems such as the filtrate not being able to be discharged smoothly. be.

[0004] Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a filter plate for a filter that allows smooth discharge of filtrate.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention is configured such that a filtrate discharge groove is formed on the bottom surface of the concave portion of the filter plate that the closing member presses through the filter medium. That is, the filter plate is such that the open end of the cylindrical filter medium is pressed by a closing member to close the lower opening of the filter medium, thereby making the filter medium bag-like, thereby making it possible to supply the stock solution into the filter medium. The filter is configured to include a recess against which the closing member is pressed through the filter medium, and a filtrate discharge groove is formed on the bottom surface of the recess.

[0006] In the above structure, the filtrate discharge groove may be formed on the entire surface of the filter plate.

[0007] In the above structure, the filtrate discharge groove may be formed at the bottom of the filter plate.

[0008]

[Example] Below, examples according to the present invention are shown in Figures 1 to 9.
This will be explained in detail based on the following.

[0009] As shown in FIGS. 1 and 2, the filter for using the filter plate according to this embodiment has a square cylindrical filter medium 1.
is suspended and supported on the support frame 2 in an expanded state via a hanging member (not shown), and the lower end opening of the filter medium 1 is closed between it and the filter plate 20 by driving the first closing cylinder 3. The stock solution is supplied into the filter medium 1 from the upper end opening, and the upper end opening of the filter medium 1 is closed by driving the second closing cylinder 5, and the upper and lower pressing cylinders 6 are closed by the pressing plate 4.
, 7 presses the filter medium 1 containing the stock solution to perform squeeze filtration, and after the filtration is completed, the first closing cylinder 3 releases the closing operation of the lower end of the filter medium 1 to open the lower end. It was roughly configured to open and discharge the cake inside the filter medium 1 below the filter medium.

[0010] The filter medium 1 is generally constructed of a rectangular cylinder made of cloth made of polypropylene fibers. The material of the fibers constituting this filter medium, the thickness of the fibers, the coarseness of the mesh, etc. are appropriately selected depending on the properties of the stock solution to be filtered. Therefore, the material of the fibers may be cotton or the like in addition to synthetic resin. Furthermore, after reinforcing a synthetic resin sheet with cloth as a backing, it is also possible to punch a large number of pores in the sheet and use it in the same way as cloth. The size of these pores can be formed to a desired size depending on the properties of the stock solution. This filter medium 1 is removably supported by the support frame 2 via a vibration imparting spring or cylinder.

[0011] In the support frame 2, filters are arranged on the left and right sides in FIGS. 1 and 2, respectively. In other words, two filters are arranged using one support frame 2. In each filter, a second closing cylinder 5 and an upper pressing cylinder 6 are arranged horizontally at the upper part of the support frame 2, and a lower pressing cylinder 7 and the first closing cylinder 3 are arranged at the lower part of the supporting frame 2. Each is placed along the horizontal direction. At the center of the support frame 2 in each filter, rails 8 are arranged on both sides of the support frame 2 so as to sandwich the upper and lower pressing cylinders 6, 7, respectively.

The first closing cylinder 3 has a push plate 3b having a rectangular shape in longitudinal section at the tip of the piston rod 3a.
is fixed, and a recess 20 formed at the lower end of the filter plate 20 fixed to the end surface of the support frame 2 on the filter medium side in FIG.
The push plate 3b is inserted into the space a. Therefore, by sandwiching the lower end of the filter medium 1 between the press plate 3b and the filter plate 20, and the press plate 3b enters the recess 20a, the lower end of the filter medium 1 is held between the press plate 4 and the filter. He is trying to close the lower end of the filter medium 1 by pressing between it and the bottom surface of the recess 20a of the plate 20.

The second closing cylinder 5 has a push plate 5b having a rectangular shape in longitudinal section at the tip of the piston rod 5a.
is fixed, and the push plate 5b is inserted into a recess 20b formed at the upper end of the filter plate 20 of the support frame 2 in FIG. Therefore, the upper end of the filter medium 1 is sandwiched between the push plate 5b and the filter plate 20, and the push plate 5
By entering the recess 20b, the upper end of the filter medium 1 is pressed between the pressing plate 4 and the bottom surface of the recess 20b of the filter plate 20, thereby closing the upper end of the filter medium 1.

As shown in FIGS. 3 to 8, the filter plate 20 has a recess 20c for receiving the filter medium 1 on the surface facing the filter medium 1, and a recess 20c for receiving the filter medium 1 on the bottom surface of the recess 20c along the vertical direction. A large number of filtrate discharge grooves 20d,..., 20
form d. The above-described recesses 20b and 20a are formed above and below the recess 20c, and the filtrate discharge grooves 20d, . . . , 20 are formed on the bottom surface of the lower recess 20a.
form d. Note that a substrate 21 is fixed to the back surface of the filter plate 20, that is, the side opposite to the filter medium 1, for reinforcement.

Rollers 16, 1 are provided on both sides of the pressing plate 4.
The rollers 16, 16 roll on the rails 8, 8, and the press plate 4 moves in the direction of contact with and away from the filter medium, that is, in the horizontal direction, by the drive of the press cylinders 6, 7.

The upper and lower pressing cylinders 6 and 7 have their piston rods 6a and 7a fixed at their tips on the filter medium side of the support frame 2, and the cylinder cases 6b and 7b have arms 6c, 6c, 7c, and Fix 7c. The tips of these arms 6c, 6c, 7c, and 7c are pivoted to the upper and lower parts of the pressing plate 4, in other words, vertically with the roller 16 in between, via pins 14, 14, 15, and 15, respectively, for pressing. Connect to plate 4. The arms 6c, 6c, 7c,
Rollers 10, 10 are provided at the cylinder case mounting portion of 7c via pins 11, 11, and rollers 10, 10 are also provided on the side surfaces of the cylinder case. Moreover, rails 9 and 12 are fixed to the support frame 2 along the horizontal direction on the outside of each cylinder case 6b and 7b of the pressure cylinders 6 and 7,
Rollers 10, 10 on each side of cylinder cases 6b, 7b
is arranged to roll on rails 9 and 12. The pressure cylinders 6 and 7 are configured to be driven separately. Therefore, since the piston rods 6a and 7a are fixed to the support frame 2 by the driving of the pressure cylinders 6 and 7,
The cylinder cases 6b, 7b move on the rails 9, 12 relative to the support frame 2, and the rollers 10,..., 10 move on the arm 6.
The pressing plate 4 moves toward and away from the filter medium 1 via the filters c, 6c, 7c, and 7c. Therefore, the pressing plate 4 is the filter medium 1
When moving toward the filter plate 20 of the support frame 2, the filter medium 1 is sandwiched between the press plate 4 and the filter plate 20 of the support frame 2, and the filter medium 1 is pressed. and press filtration.

On the other hand, in the space below the support frame 2, although not specifically shown, a filtrate receiving member, a cake collecting member, etc. may be provided to collect the filtrate or cake discharged from the filter medium 4. preferable.

According to the above structure, as shown in FIGS. 1 and 2, with the filter medium 1 suspended and supported in the shape of a rectangular cylinder by a spring or the like within the support frame 2, the first closing cylinder 3 is driven to close the push plate. 3
b into the lower recess 20a of the filter plate 20 through the filter medium 1, press the lower end of the filter medium between the push plate 3b and the bottom of the recess of the filter plate 20, and open the lower end opening of the filter medium 1. Obstruction.

Next, the stock solution is supplied from the upper end opening of the filter medium 1 into the bag-shaped filter medium 1 whose lower end is closed, and filtration is performed. As this stock solution, for example, 0.1 to 2
There are various types of liquids, such as liquids with a solid content of about 1.5%, and liquids with a solid content of several % or more suitable for filtering with a filter. Incidentally, when the above-mentioned stock solution is supplied, the filtrate discharged from the filter medium 1 is received by the above-mentioned filtrate receiving member, etc., and is recovered by a filtrate collecting member, etc. (not shown).

Next, as shown in FIG. 9, the second closing cylinder 5 is driven to insert the push plate 5b into the upper recess 20b of the filter plate 20 through the filter medium 1, so that the push plate 5b and the filter plate 20 are separated. The upper end of the filter medium 1 is pressed between the bottom surface of the recess and the upper end opening of the filter medium 1.

Next, the upper and lower pressing cylinders 6 and 7 are driven to move the pressing plate 4 from the solid line position I to the dashed-dotted line position II in FIG.
The filter medium 1 is gradually pressed between the filter medium 1 and the cake inside the filter medium 1 is squeezed out. At this time, the pressing plate 4 is moved by the rollers 16, 16 on both sides.
By rolling on the rails 8, 8, it moves in a direction in which it comes into contact with the filter medium 1. In this case, the stock solution generally tends to accumulate at the bottom of the filter medium 1 rather than at the top due to its own weight, and the lower part of the pressing plate 4 first comes into contact with the bottom of the filter medium 1 swollen by the stock solution and starts pressing. At this time, since the pressure cylinders 6 and 7 are driven separately, the lower pressure cylinder 7 receives a resistance force because it presses the stock solution in the lower part of the filter medium 1, but the upper pressure cylinder 6 does not come into contact with the filter medium 1. Therefore, the upper part of the pressing plate 4 moves toward the filter medium side with respect to the lower part, and is inclined as shown by the dashed line II in FIG. When tilted in this way, the upper part of the pressing plate 4 also touches the filter medium 1 in the same way as the lower part.
to start pressure filtration. Finally, press plate 4
The press cylinders 6 and 7 are driven and moved to the position shown by the two-dot chain line III in FIG. 9, and the stock solution in the filter medium 1 is compressed and filtered. At this time, the filtrate discharged from the filter medium 1 is guided downward by the surface of the pressing plate 4 and by the filtrate discharge grooves 20d, . At the lower end of the filter plate 20, the pusher plate 3b is inserted into the lower recess 20a of the filter plate 20 via the lower end of the filter medium 1, and the bottom of the recess 20a of the filter plate 20 has a filtrate discharge groove 20d. Therefore, the filtrate is smoothly discharged downward through the filtrate discharge groove 20d between the filter medium 1 pressed toward the filter plate 20 by the pusher plate 3b and the bottom surface of the filter plate 20.

Next, after the press filtration is completed, the press cylinder 6
, 7 are reversely driven to release the compression of the filter medium 1 by the pressing plate 4. In addition, the first and second closing cylinders 3 and 5 are reversely driven to open the openings at both upper and lower ends of the filter medium 1 (see FIGS. 1 and 2), and the cake inside the filter medium 1 is caused to fall below the filter medium by its own weight.
A cake collecting member collects the fallen cake.

Next, when the collection of the cake is completed, the first closing cylinder 3 is driven to close the opening at the lower end of the filter medium 1 in preparation for the next filtration.

According to the above embodiment, since the filtrate discharge groove 20d is formed on the bottom surface of the recess 20a of the filter plate 20, the filter medium 1 is pressed against the bottom surface of the recess 20a of the filter plate 20 by the pusher plate 3b. Even if the filtrate is discharged from the filter medium 1 to the filter plate side, the filtrate can flow downward through the filtrate discharge groove 20d. Therefore, the filtrate can be discharged smoothly.

It should be noted that the present invention is not limited to the above embodiments, but can be implemented in various other ways. for example,
The filter medium 1 is not limited to a square cylinder, but may have any polygonal shape such as a triangular cylinder or a pentagonal cylinder. Further, the first and second closing cylinders 3 and 5 and the pressure cylinders 6 and 7 may be air cylinders or hydraulic cylinders, and the same action can be performed by other known driving means. Also,
The pressing action of the pressing cylinders 6 and 7 on the filter medium 1 is as follows:
The filter medium 1 may be pressed not only from one direction but also from two directions. Further, as described in the above embodiment, the filtrate discharge groove 20d is formed on the entire bottom surface of the recess 20c of the filter plate 20, and the filtrate discharge groove 20d is formed only at the lower end of the bottom surface.
d may also be formed. In addition, the filtrate discharge groove 2
0d is formed only at the lower end of the bottom of the recess 20c of the filter plate 20, and if necessary, a drain plate or sheet such as a net is laid over the remaining part to facilitate the discharge of the filtrate. Good too.

[0026]

According to the structure of the present invention, since the filtrate discharge groove is formed on the bottom surface of the recess of the filter plate, even if the filter medium is pressed toward the bottom surface of the recess of the filter plate by the closing member, the filter medium can be removed. The filtrate discharged to the filter plate side can flow downward through the filtrate discharge groove. Therefore, the filtrate can be discharged smoothly.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a filter having a filter plate according to an embodiment of the present invention, in which the filter medium is not blocked.

FIG. 2 is a side view of the filter using the filter plate according to the above embodiment in a state where the filter medium is not blocked.

FIG. 3 is a front view of the filter plate according to the above embodiment.

FIG. 4 is a bottom view of the filter plate.

FIG. 5 is a cross-sectional view taken along line BB in FIG. 3.

FIG. 6 is a sectional view taken along line CC in FIG. 3.

7 is a sectional view taken along the line DD in FIG. 3. FIG.

FIG. 8 is a cross-sectional view taken along line AA in FIG. 3.

FIG. 9 is a side view of the filter in a state where the filter medium is closed.

[Explanation of symbols]

1 filter medium, 2 support frame, 3 first closing cylinder,
3b Pressing plate, 4 Pressing plate, 5 Second closing cylinder, 5
b Press plate, 6, 7 Press cylinder, 8, 9 Rail, 10 Roller, 11 Pin, 12 Rail,
13 roller, 14, 15 pin, 16 roller, 20 filter plate, 20a, 20b recess, 20c
Hollow, 20d filtrate discharge groove, 21 Substrate.

Claims (3)

[Claims] Claim 1: By pressing the open end of the cylindrical filter medium (1) with a closing member (3) to close the lower opening of the filter medium (1) and making the filter medium (1) into a bag shape. The filter plate is for making it possible to supply the stock solution into the filter medium, and includes a recess (20a) against which the closing member (3) is pressed through the filter medium (1), and has a recess (20a) on the bottom surface of the recess (20a). A filter plate for a filter, characterized in that a filtrate discharge groove (20d) is formed. 2. The filter plate for a filter according to claim 1, wherein the filtrate discharge groove (20d) is formed on the entire surface of the filter plate. 3. The filter plate for a filter according to claim 1, wherein the filtrate discharge groove (20d) is formed at the bottom of the filter plate.