JP7426577B2 - vacuum filtration machine - Google Patents

Description

The present invention relates to an improvement of a suction port provided in a cylindrical portion of a drum, and particularly to a vacuum filter having a suction port opening/closing mechanism that opens only the filtration/dehydration zone.

In general, as disclosed in Cited Document 1, a vacuum dehydrator rotates a drum that is partially immersed in a stock solution tank, and distributes only the liquid into the drum through a filter that is wrapped around the outer circumferential surface of the drum. The structure is such that solid matter stuck to the filter is recovered while being discharged to the outside of the drum using a suction pipe provided.

Furthermore, in Cited Document 2, a force is applied from the other side to a movable member that closes a through hole formed in a plate while being biased by an elastic body from one side, thereby creating a gap between the movable member and the through hole. A dust removal device has been disclosed in which dust is removed and suction is carried out from the gap.

Utility Model Publication No. 5-74607 Patent No. 3452859

Conventionally, as disclosed in Prior Document 1, a vacuum dehydrator performs suction through a suction pipe that communicates with a vacuum suction chamber formed around the periphery of a drum. The vacuum suction chambers are divided at equal intervals in the circumferential direction, one of the suction tubes communicating with each vacuum suction chamber inside the drum, and the other connected to a rotary valve on the side.

Due to this configuration, it is necessary for a worker to enter the drum during maintenance of the suction piping, which creates a poor working environment and increases man-hours and costs. In addition, small-sized vacuum filters that do not allow workers to enter the drum are hardly available on the market because suction piping cannot be installed inside the drum. Furthermore, a rotary valve was provided to prevent vacuum suction in the area where filtration and dehydration were not performed (immediately before the stock solution tank), which also added cost and effort.

Further, the dust removal device of Prior Document 2 is a mat that sucks and removes dust, dust, etc. attached to the soles of shoes and wheels of people and vehicles when they enter factories, stores, etc. There is no description or suggestion regarding application to water treatment and sludge treatment industries for separating solid matter.

The present invention provides a vacuum filter in which a suction port is opened on the drum surface only in the filtration/dehydration zone by utilizing the tension of the filter without installing a suction pipe connected to the opening on the drum surface.

In the present invention, a rotatably arranged drum is supported in a stock solution tank, a part of the drum is immersed, and only the liquid is discharged from a suction pipe through an endless filter wrapped around the drum. In a vacuum filtration machine that collects solid matter stuck to a drum, there are a number of suction ports that open in the cylindrical part of the drum, an elastic member, a support plate that fixes the elastic members, and a pressure force applied to the suction ports by the elastic member. and a suction port opening/closing mechanism composed of a columnar body that guides the pressing body , and when the suction port is closed by the pressing body, the top of the pressing body is raised to a predetermined height outward from the cylinder part. When the filter is wound around the cylindrical part of the drum, the top of the pressing body is pressed to the surface of the cylindrical part, connecting the inside and outside of the drum, and connects to the opening on the drum surface. Since no suction piping is installed, maintenance related to the suction piping is easy , and the filter can be easily swung by the tension of the filter.

It is equipped with a plurality of annular supporting plates at a predetermined distance from the suction port along the cylindrical portion, or a plurality of straight support plates at a predetermined distance from the suction port along the cylindrical portion, and the arrangement of the suction port and the vacuum filtration machine are It can be selected as appropriate depending on the specifications.

If a tension adjustment mechanism is provided to adjust the tension of the filter, the tension can be set to the optimum tension at all times.

When equipped with a rotary joint inserted through the side plate of the drum and a suction pipe connected to the inside of the rotary joint and extended near the bottom along the side plate, the processing liquid filtered inside the drum can be collectively discharged to the outside. It becomes possible.

Since the vacuum filter of the present invention does not have suction piping connected to the opening on the drum surface, there is no need for a worker to enter inside the drum during assembly, disassembly, and maintenance. Therefore, the work environment is good and work time and costs can be reduced. Furthermore, by utilizing the tension of the filter, the suction port opens only in the filtration/dehydration zone where the filter is in contact with the cylindrical portion of the drum, making it possible to perform stable solid-liquid separation processing.

FIG. 1 is a side sectional view of a vacuum filter according to the present invention. Similarly, it is a front sectional view of the vacuum filter. Similarly, it is a layout diagram of a suction port opening/closing mechanism. FIG. 7 is a layout diagram of a suction port opening/closing mechanism of another embodiment of the vacuum filter according to the present invention. FIG. 2 is a detailed view of a main part of the suction port opening/closing mechanism of the vacuum filter according to the present invention in a state where the suction port is closed. Similarly, it is a detailed view of the main part of the suction port opening/closing mechanism in a state where the suction port is opened .

An embodiment of the present invention will be described in detail based on the drawings. FIGS. 1 and 2 are a side sectional view and a front sectional view, respectively, of a vacuum filter.
The vacuum filter 1 is constructed using a stock solution tank 2 filled with stock solution, a cylindrical drum 3 whose lower side is immersed in the stock solution tank 2 and rotatably supported, and an endless filter 4 that is hung around the drum 3. It consists of

The drum 3 is composed of a cylindrical tube portion 5 and side plates 6, 6, and the tube portion 5 has a large number of suction ports 7 that communicate with each other inside and outside. Drum shafts 8, 8 rotatably supported by the stock solution tank 2 are connected to the side plate 6, and one drum shaft 8 is connected to a drive machine (not shown) to rotate the drum 3. The other drum shaft 8 is formed hollow, and a suction pipe 10 is inserted into the drum 3 via a rotary joint 9.

One end of a suction pipe 10 is connected to the inside of the drum 3 of the rotary joint 9, and the other end of the suction pipe 10 is extended inside the drum 3 along the side plate 6 to near the bottom. A discharge pipe 11 is connected to the outside of the drum 3 of the rotary joint 9, and is connected to a suction source (such as a vacuum pump) not shown. Due to the rotary joint 9, the suction pipe 10 and the discharge pipe 11 are not affected by the rotation of the drum 3, and the suction pipe 10 always remains fixed toward the bottom of the drum 3.

FIG. 3 is a layout diagram of the suction port opening/closing mechanism, and FIG. 4 is a layout diagram of the suction port opening/closing mechanism of another embodiment.
The cylindrical portion 5 has a large number of suction ports 7 communicating inside and outside. The suction ports 7 are circular and are approximately evenly distributed over the entire circumference and width of the cylindrical portion 5.

Inside the drum 3, a plurality of support plates 12 are provided along the cylindrical portion 5 at a predetermined distance from the suction port 7. The support plate 12 may include a plurality of annular support plates 12 arranged in parallel along the circumferential surface of the cylindrical portion 5 as shown in FIG. It may be configured as follows. Note that the support plate 12 is fixed to the inner surface of the drum by known means.

FIG. 5 is a detailed view of the main parts of the suction port opening/closing mechanism in a state where the suction port is closed.
The suction port opening/closing mechanism 13 includes an elastic member 14, a support plate 12 that fixes the elastic member 14, a pressing body 15 that is urged against the suction port 7 by the elastic member 14, and guiding the pressing body 15 toward the cylindrical portion 5. It is composed of a column 16.

A support plate 12 is provided at a predetermined distance opposite the suction ports 7, and an elastic member 14 corresponding to each suction port 7 is fixed to the support plate 12. In this embodiment, a coil spring is used as the elastic member 14, and positioning is performed by inserting a portion of the coil spring into a recess 17 formed in the support plate 12.

A pressing body 15 is attached to the end of the elastic member 14 to urge it toward the cylindrical portion 5 of the drum 3. The pressing body 15 is formed into a substantially conical shape, and the tapered surface 15a presses against the suction port 7 to close the opening. At this time, the top portion 15b of the pressing body 15 protrudes outward from the cylindrical portion 5 by a predetermined height, and is swingable inward by external pressure from the outside. Note that the pressing body 15 is not limited to a conical shape as long as it has a shape that allows the top portion 15b to protrude from the cylindrical portion 5 while the suction port 7 is closed.

A column 16 projects from the bottom surface 15c of the pressing body 15, and guides the direction in which the elastic member 14 urges the pressing body 15. In this embodiment, by inserting the column 16 having an outer diameter that approximates the inner diameter of the coil spring, the pushing body 15 is configured to be able to press against the suction port 7 of the cylindrical portion 5 and reliably close it without tilting. There is.

FIG. 6 is a detailed view of the main parts of the suction port opening/closing mechanism with the suction port opened.
When the filter 4 is wound around the outside of the cylindrical portion 5 of the drum 3, the filter 4 comes into contact with the top portion 15b of the pressing body 15 protruding from the cylindrical portion 5. The tension of the filter 4 presses the top portion 15b of the pressing body 15 to the surface of the cylindrical portion 5. At this time, a gap 18 is formed between the tapered surface 15a of the pressing body 15 and the suction port 7, and the inside and outside of the drum 3 are communicated with each other.

The filter 4 is wound around a drum 3, a peeling roll 19, and a plurality of guide rolls 20 to form an endless shape.

The drum 3 is equipped with a filter 4, which includes a filtration zone that sucks liquid from the stock solution tank 2 and adsorbs solid matter to the filter 4, and a dehydration zone that separates the solid matter adsorbed to the filter 4 by gravity under its own weight in the atmosphere. Specifically, the undiluted solution supplied to the undiluted solution tank 2 is rotated from near the water surface to near the top. A peeling roll 19 is provided immediately after the drum 3, on which a scraper 21 is slid. A plurality of guide rolls 20 are provided between the peeling roll 19 and the drum 3, and are provided with a cleaning mechanism 22 that sprays a cleaning liquid or immerses it in the cleaning liquid. Further, some of the rolls are equipped with a tension adjustment mechanism 23 that adjusts the tension of the filter 4 .

When the suction source is driven, the inside of the drum 3 is suctioned through the discharge pipe 11 and the suction pipe 10 , and the inside of the drum 3 is brought into a negative pressure state. A filter 4 is extended from the entrance of the stock solution tank 2 to near the top of the drum 3, and during this time the suction port 7 is opened and a suction action is generated toward the inside of the drum 3.

Specifically, in the stock solution tank 2 (filtration zone), the solid-liquid mixture in the stock solution tank 2 is attracted to the drum 3 . At this time, solids larger than the passage area of the filter 4 accumulate on the filter 4, and liquids smaller than the passage area of the filter 4 pass through the filter 4 and are connected to the suction port 7 formed in the cylindrical part 5 and the pressing body. 15 into the drum 3 through the gap 18.

In the latter stage (dehydration zone) of the stock solution tank 2, the solid matter deposited on the filter 4 by the suction force from the gap 18 between the suction port 7 and the pressing body 15 is promoted to be gravitational separated by its own weight in the atmosphere. Similar to the filtration zone, liquids smaller than the aperture ratio of the filter 4 pass through the filter 4 and are sucked into the drum 3 through the gap 18 formed in the cylindrical portion 5.

In the zone of the drum 3 where the filter 4 is not wrapped around, the pressing body 15 closes the suction port 7 to prevent air from entering from outside.

The processing liquid sucked into the drum 3 is continuously discharged to the outside from a suction pipe composed of a suction pipe 10, a rotary joint 9, and a discharge pipe 11.

The solid content deposited on the filter 4 is scraped off and recovered by a scraper 21 that is slid on the peeling roll 19. Furthermore, the filter 4 is cleaned of solid content by a cleaning mechanism 22 at a stage subsequent to the peeling roll 19 and is regenerated. The filter 4 is formed into an endless shape by being wound around a plurality of guide rolls 20, and continuously separates the solid-liquid mixture in the stock solution tank 2 into solid-liquid.

In a vacuum filter 1 in which a filter 4 wound endlessly around a drum 3 and each roll 19, 20 is rotated, when the drum 3 is driven to rotate, the tension of the filter 4 on the upstream side of the drum 3 generally increases. , the filter 4 tension downstream of the drum 3 decreases. In order to ensure the tension that pushes down the pressing body 15 to the cylindrical portion 5 of the drum 3 in the dewatering zone, it is desirable to provide a tension adjustment mechanism 23 downstream of the drum 3 up to the peeling roll 19.

The vacuum filtration machine according to the present invention has a structure in which the suction action is generated only on the surface of the drum that is in contact with the filter, and there is no need for suction piping from the inside of the drum to the surface. No piping or rotary valves required.
Therefore, risks such as poor connection of suction piping and air leakage are reduced, maintenance efficiency is high, and work time and costs can be reduced. In addition, it is possible to design a small model that does not have space for a worker to enter, and can be applied to all vacuum filtration machines from large to small.

1 Vacuum filter 2 Stock solution tank 3 Drum 4 Filter 5 Cylindrical portion 6 Side plate 7 Suction port 9 Rotary joint 10 Suction tube 12 Support plate 13 Suction port opening/closing mechanism 14 Elastic member 15 Pressing body 15b Top portion 16 Column 23 Tension adjustment mechanism

Claims (5)

A rotatably arranged drum (3) is supported on the stock solution tank (2), a part of the drum (3) is immersed, and the liquid is passed through an endless filter (4) wrapped around the drum (3). In a vacuum filter that discharges only the liquid content from the suction piping and recovers the solid content stuck to the filter (4),
A large number of suction ports (7) opening in the cylindrical portion (5) of the drum (3);
An elastic member (14), a support plate (12) that fixes the elastic member (14), a pressing body (15) urged toward the suction port (7) by the elastic member (14), and a pressing body (15). a suction opening/closing mechanism (13) composed of a columnar body (16) that guides the suction opening/closing mechanism (13) ;
When the suction port (7) is closed by the pressing body (15), the top (15b) of the pressing body (15) protrudes outward from the cylindrical portion (5) by a predetermined height;
When the filter (4) is wound around the cylindrical part (5) of the drum (3), the top (15b) of the pressing body (15) is pressed to the surface of the cylindrical part (5), and the inside and outside of the drum (3) are pressed. will be communicated
A vacuum filtration machine characterized by: The vacuum filter according to claim 1, characterized in that a plurality of annular support plates (12) are provided along the cylindrical portion (5) at a predetermined distance from the suction port (7). The vacuum filter according to claim 1, characterized in that a plurality of linear support plates (12) are provided along the cylindrical portion (5) at a predetermined distance from the suction port (7). The vacuum filter according to any one of claims 1 to 3 , further comprising a tension adjustment mechanism (23) for adjusting the tension of the filter (4). a rotary joint (9) inserted through the side plate (6) of the drum (3);
5. A suction pipe (10) connected to the inside of the rotary joint (9) and extending along the side plate ( 6 ) to near the bottom thereof. vacuum filtration machine.

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