JPH072202B2 - Filter plate of filter - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Hitherto, various types of filters have been proposed for this type of filter. For example, after pressing the lower end opening of the tubular filter medium toward the filter plate with a closing rod to close it into a bag shape,
The stock solution is supplied from the upper end opening, and the pressing plate is moved horizontally to press the filter medium against the filter plate to filter the cake in the filter medium between the filter plate and the pressing plate. There is one configured to open the part opening and discharge the cake in the filter medium.

[0003]

However, in the structure described above, a concave portion for fitting the closing rod is formed in the lower portion of the filter plate, and the closing rod is inserted into the concave portion through the filter medium. When pressed, the filtrate discharged from the filter material above the recess toward the filter plate may accumulate between the blocking bar and the bottom of the recess, which may cause a problem that the filtrate cannot be discharged smoothly. is there.

Therefore, an object of the present invention is to solve the above problems and to provide a filter plate of a filter which can smoothly discharge the filtrate.

[0005]

In order to achieve the above object, the present invention is configured to form a filtrate discharging groove on the bottom surface of the concave portion of the filter plate which is pressed by the closing member through the filter medium. That is, a filter plate for allowing an undiluted solution to be supplied into the filter medium by pressing the opening end of the tubular filter medium with a closing member to close the lower opening of the filter medium and forming the filter medium into a bag shape. In addition, there is provided a concave portion against which the closing member is pressed via the filter medium, and the filtrate discharging groove is formed on the bottom surface of the concave portion.

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

In the above structure, the filtrate discharge groove may be formed below the filter plate.

[0008]

DETAILED 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 FIGS. 1 and 2, the filter for using the filter plate according to the present embodiment has a rectangular cylindrical filter medium 1 as shown in FIG.
Is suspended and supported by the support frame 2 in a stretched state via a suspension member (not shown), and the lower end opening of the filter medium 1 is closed by driving the first closing cylinder 3 with the filter plate 20. 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 pressing plate 4 drives the upper and lower pressing cylinders 6 and 7 to remove the stock solution. While pressing the contained filter medium 1 to perform squeeze filtration, after the completion of filtration, the closing operation of the lower end portion of the filter medium 1 is released by the first closing cylinder 3 to open the lower end opening, and the cake in the filter medium 1 is removed. It was constructed so as to be discharged below the filter medium.

The filter medium 1 is generally made of a cloth made of polypropylene fiber and has a rectangular cylindrical shape. The material of the fibers constituting the filter medium, the thickness of the fibers, the roughness of the mesh and the like are appropriately selected according to the properties of the stock solution to be filtered. Therefore, the material of the fiber may be cotton or the like other than synthetic resin. Further, after reinforcing a synthetic resin sheet with a cloth as a backing, a large number of pores can be opened in the sheet, and the sheet can be used in the same manner as the cloth. The size of the pores can be formed to a desired size depending on the properties of the stock solution. The filter medium 1 is detachably supported on the support frame 2 via a vibration imparting spring or a cylinder.

Filters are arranged on the left and right sides of the support frame 2 in FIGS. 1 and 2, respectively. In other words, two filters are arranged so that one support frame 2 is also used. In each of the filters, the second closing cylinder 5 and the upper pressing cylinder 6 are arranged in the horizontal direction on the upper part of the support frame 2, and the lower pressing cylinder 7 is arranged on the lower part of the support frame 2.
And the first closing cylinder 3 are arranged along the horizontal direction.
Rails 8 are arranged at the center of the support frame 2 in each filter so as to sandwich the vertical pressing cylinders 6 and 7 on both sides of the support frame 2.

The first closing cylinder 3 has a piston rod 3a, and a push plate 3b having a rectangular cross section in a longitudinal section at a tip thereof.
Is fixed, and the concave portion 20 formed in the lower end portion 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 inside a. Therefore, the lower end portion of the filter medium 1 is sandwiched between the pressing plate 3b and the filter plate 20 and the pressing plate 3b is inserted into the recess 20a, so that the lower end portion of the filter medium 1 is separated from the pressing plate 4 by the filter plate 4. The lower end of the filter medium 1 is closed by pressing it against the bottom surface of the recess 20a of the plate 20.

The second closing cylinder 5 has a pushing plate 5b having a rectangular cross section at the tip of its piston rod 5a.
Is fixed, and the push plate 5b is inserted into the recess 20b formed in the upper end of the filter plate 20 of the support frame 2 in FIG. Therefore, the upper end portion of the filter medium 1 is sandwiched between the pressing plate 5b and the filter plate 20 so that the pressing plate 5
When b enters 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 to close 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 bottom surface of the recess 20c extending vertically. Many filtrate discharge grooves 20d, ..., 2
0d is formed. The recesses 20b and 20a are formed above and below the recess 20c, and the filtrate discharge grooves 20d, ..., 2 are formed on the bottom surface of the lower recess 20a.
0d is formed. A substrate 21 is fixed on the back surface of the filter plate 20, that is, on the side opposite to the filter medium 1 for reinforcement.

Rollers 16, 1 are provided on both sides of the pressing plate 4.
6 are arranged, the rollers 16 and 16 roll on the rails 8 and 8, and the pressing plate 4 is moved by the driving of the pressing cylinders 6 and 7 in the contacting / separating direction with respect to the filter medium, that is, along the horizontal direction.

The upper and lower pressing cylinders 6 and 7 have the tips of their piston rods 6a and 7a fixed to the filter medium side of the support frame 2, and the cylinder cases 6b and 7b are provided with arms 6c, 6c, 7c, respectively on both side surfaces thereof. Fix 7c. The tips of these arms 6c, 6c, 7c, 7c are pivotally attached to the upper part and the lower part of the pressing plate 4, in other words, vertically so as to sandwich the roller 16, via pins 14, 14, 15, 15 respectively. Connect to plate 4. The arms 6c, 6c, 7
The cylinders 10 and 10 are provided with the rollers 10 and 10 on the cylinder case mounting portions via the pins 11 and 11, and the rollers 10 and 10 are also provided on the side surface of the cylinder case. Further, rails 9 and 12 are fixed to the outer side of the cylinder cases 6b and 7b of the pressing cylinders 6 and 7 along the horizontal direction of the support frame 2, and rollers 10 on both sides of the cylinder cases 6b and 7b are provided.
10 rolls on the rails 9 and 12. The pressing cylinders 6 and 7 are configured to be driven separately. Therefore, since the piston rods 6a, 7a are fixed to the support frame 2 by the driving of the pressing cylinders 6, 7, the cylinder cases 6b, 7b with respect to the support frame 2 on the rails 9, 12 on the rollers 10 ,. 10 moves, and the pressing plate 4 moves toward and away from the filter medium 1 via the arms 6c, 6c, 7c, 7c. Therefore, when the pressing plate 4 moves toward the filter medium 1, the filter medium 1 is sandwiched between the pressing plate 4 and the filter plate 20 of the support frame 2 to press the filter medium 1,
The cake in the filter material 1 is squeezed between the pressing plate 4, the support frame 2 and the filter plate 20 to perform squeeze filtration.

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

According to the above construction, as shown in FIGS. 1 and 2, the first closing cylinder 3 is driven and the pressing plate is driven while the filter medium 1 is suspended and supported in the support frame 2 by a spring or the like in the shape of a rectangular tube. Three
b is inserted into the lower recess 20a of the filter plate 20 via the filter medium 1, and the lower end of the filter medium is pressed between the pressing plate 3b and the bottom surface of the recess of the filter plate 20 to open the lower end opening of the filter medium 1. Block.

Then, the undiluted 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 to perform filtration. As this stock solution, for example, 0.1 to
There are various liquids such as liquids containing about 2% solids, and liquids containing several% or more solids suitable for performing filtration with a filter. The filtrate discharged from the filter medium 1 at the time of supplying the undiluted solution is received by the filtrate receiving member or the like and is recovered by a filtrate recovery member or the like 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 via the filter medium 1, and the push plate 5b and the filter plate 20 are inserted. The upper end of the filter medium is pressed against the bottom surface of the concave portion to close the opening of the upper end of the filter medium 1.

Next, the vertical pressing cylinders 6 and 7 are driven to move the pressing plate 4 from the solid line position I to the alternate long and short dash line position II in FIG. 9, and the pressing plate 4 and the filter plate 20 of the support frame 2 are moved.
The filter medium 1 is gradually pressed between and to squeeze the cake in the filter medium 1. At this time, the pressing plate 4 has the rollers 16, 16 on both sides.
Rolls on the rails 8 and 8 to move in a direction of contacting the filter medium 1. In this case, generally, the stock solution is more likely to collect in the lower part than in the upper part of the filter medium 1 due to its own weight, and the lower part of the pressing plate 4 first comes into contact with the lower part of the filter medium 1 swollen by the stock solution to start pressing. At this time, since the pressing cylinders 6 and 7 are driven separately, the lower pressing cylinder 7 receives a resistance force to press the stock solution in the lower portion of the filter medium 1, but the upper pressing cylinder 6 contacts the filter medium 1. Therefore, the upper portion of the pressing plate 4 moves toward the filter medium side with respect to the lower portion, and is inclined as indicated by the alternate long and short dash line II in FIG. When inclined in this way, the upper part of the pressing plate 4 as well as the lower part of the filter medium 1
And press filtration is started. Finally, the pressing plate 4
Drives the pressing cylinders 6 and 7 to the position indicated by the alternate long and two short dashes line III in FIG. 9, and press-filters the stock solution in the filter medium 1. 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, ..., 20d on the bottom surface of the recess 20c of the filter plate 20. At the lower end of the filter plate 20, the pressing 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 filtrate discharge groove 20d is formed on the bottom surface of the recess 20a of the filter plate 20.
Therefore, the filtrate is filtered by the pressing plate 3b.
It is smoothly discharged downward through the inside of the filtrate discharge groove 20d between the filter medium 1 and the bottom surface of the filter plate 20 which are pressed toward each other.

After the squeeze filtration is completed, the pressing cylinders 6 and 7 are driven in reverse to release the squeezing of the filter medium 1 by the pressing plate 4. Further, the first and second closing cylinders 3 and 5 are driven in reverse to open the upper and lower end openings of the filter medium 1 (see FIGS. 1 and 2),
The cake in the filter medium 1 is dropped below the filter medium by its own weight, and the cake collecting member collects the dropped cake.

Next, when the cake is collected, the first closing cylinder 3 is driven to close the lower end opening of the filter medium 1 in order to prepare for the next filtration again.

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 by the pressing plate 3b toward the bottom surface of the recess 20a of the filter plate 20. However, the filtrate discharged from the filter medium 1 to the filter plate side can flow downward through the filtrate discharge groove 20d. Therefore, the discharging action of the filtrate can be smoothly performed.

The present invention is not limited to the above embodiment, but can be implemented in various other modes. For example,
The filter medium 1 is not limited to a rectangular cylinder, and may be any polygonal shape such as a triangular cylinder or a pentagonal cylinder. Further, the first and second closing cylinders 3 and 5 and the pressing cylinders 6 and 7 may be air cylinders or hydraulic cylinders, and the same operation 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 is not limited to be pressed from one direction, and the filter medium 1 may be pressed 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 20 is formed only at the lower end of the bottom surface.
You may make it form d. Also, the filtrate discharge groove 2
0d is formed only on the lower end of the bottom surface of the hollow 20c of the filter plate 20, and a drainer plate such as a net or a sheet is laid on the remaining part as necessary to smoothly discharge the filtrate. Good.

[0026]

According to the structure of the present invention, since the filtrate discharge groove is formed on the bottom surface of the concave portion of the filter plate, even if the filter material is pressed toward the bottom surface of the concave portion of the filter plate by the closing member, The filtrate discharged from the filter plate side can be discharged downward through the filtrate discharge groove. Therefore, the discharging action of the filtrate can be smoothly performed.

[Brief description of drawings]

FIG. 1 is a plan view of a filter having a filter plate according to an embodiment of the present invention in a state where a filter medium is not closed.

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 closed.

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.

5 is a sectional view taken along line BB of FIG.

6 is a cross-sectional view taken along the line CC of FIG.

7 is a cross-sectional view taken along the line DD of FIG.

8 is a cross-sectional view taken along the line AA of FIG.

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

[Explanation of symbols]

1 Filter Material, 2 Support Frame, 3 First Closing Cylinder, 3b
Push plate, 4 push plate, 5 second closing cylinder, 5b push plate,
6,7 pressing cylinder, 8,9 rail, 10 roller, 11 pin, 12 rail, 13 roller, 14,
15 pins, 16 rollers, 20 filter plates, 20a, 20
b recess, 20c dent, 20d filtrate discharge groove, 21
substrate.

Claims (3)

[Claims] 1. A cylindrical filter medium (1) having an open end pressed by a closing member (3) to close the lower opening of the filter medium (1) to form the filter medium (1) into a bag shape. A filter plate for making it possible to supply a stock solution into the filter medium, comprising a recess (20a) against which the blocking member (3) is pressed via the filter medium (1), the bottom surface of the recess (20a). A filter plate of a filter characterized in that a groove (20d) for discharging a filtrate is formed. 2. The filter plate of the 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 of the filter according to claim 1, wherein the filtrate discharge groove (20d) is formed in a lower portion of the filter plate.