JPH023766Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a filtering device for removing foreign matter such as cutting chips from a contaminated liquid discharged from a cleaning device or the like.

(Prior art) Conventionally, a filter using a filter screen or a device using a magnet is generally used to remove foreign substances such as cutting chips by filtering the contaminated liquid. ing. However, filters using mesh tend to clog, and filters using magnets are not effective because they do not attract foreign substances other than magnetic substances, so they cannot separate foreign substances sufficiently.

In order to eliminate such drawbacks, the fifth to
A strainer as shown in Figure 6 is used.
The rear surface of the octagonal casing 2 of the strainer 1 is closed by a substrate 3, and a plate 4 is attached to the front surface, and the plate 4 has a large opening 4a. A mesh 5 is stretched around the circumferential surface of the casing 2. Further, a cylindrical holder 3a is attached to the center of the substrate 3, and a drive shaft 6 passing through the cylindrical holder 3a is fixed to the cylindrical holder 3a. The drive shaft 6 is a horizontal shaft supported by a bearing 6a fixed to the strainer main body 1, and rotates together with the housing 2.

A screw 7 is attached to the drive shaft 6 at a portion protruding from the inside of the housing 2 and from the opening 4a of the front plate 4 to the outside. A chute 8 is provided at the bottom of the screw 7 so as to be inclined downward toward the base 3. The screw 7 has a larger diameter on the base 3 side and gradually increases in diameter toward the tip so as to match the shape of the chute 8. They are blade-shaped with a gradually decreasing diameter and form a screw conveyor. Screw 7
The part that protrudes from the housing 2 is the chute 8 below.
The upper part is a chute cover 8a, which covers the entire screw 7.The tip of the chute 8 is bent downward to form a discharge port 9, and the lower part of the chute 8 has an opening 4a. A passage 1 that opens into the inside of the casing 2 and serves as an inlet for the dirty liquid.
0 is set. There is an excess liquid storage tank 11 in the lower part of the casing 2, and the casing 2 is provided with a partition 12.

The dirty liquid mixed with foreign matter flows through the inlet passage 10 and enters the casing 2, but is passed through the filter screen 5 and enters the storage tank 11. Foreign matter such as chips should be removed from the housing 2.
However, since the casing 2 rotates at a low speed of about once per minute, it is guided to the top of the casing 2 by the partition 12 and falls onto the screw conveyor 7.
Then, the screw conveyor 7 transports the foreign matter toward the discharge port 9, but since liquid is attached to the foreign matter such as chips, it is transported onto the chute 8 while being conveyed by the screw conveyor 7. Fall. The liquid that has fallen into the chute 8 falls onto the lower casing 2 through holes provided therein, and is led into the tank 11 through the screen 5.

As a result, foreign matter in the mesh 5 is constantly removed by the rotation of the housing, and the mesh 5 remains in good shape without clogging. If a backwash nozzle 13 is installed above the housing, clogging can be further reduced (see Utility Model Publication No. 52-33982).

(Problem to be solved by the invention) However, in the above-mentioned filtration equipment, the inlet of the waste liquid must be set above a certain height, so it is not applicable if the waste liquid outlet is low. In addition, in order to reduce the height of the entrance, the size of the housing 2 must be reduced, resulting in a decrease in processing capacity. Further, the rotary strainer described above has a complicated structure and requires the use of expensive and difficult-to-maintain elements such as a conical screw conveyor. The present invention has been made in order to obtain a strainer that has a simple structure, has a low intake port for dirty liquid, and does not cause clogging in the screen.

(Means for Solving the Problems) The present invention is a means for solving the above-mentioned problems, in which a filtration net is installed on the outer circumferential surface of a storage tank in a filtration device that filters waste liquid to remove foreign substances. A stretched casing is rotatably supported, scraping plates are radially attached to the outer periphery of the casing, and a part of the bottom of the storage tank has a center axis that is the same as the rotation center of the casing. The water storage tank is formed with an arcuate bottom surface that the scraping plate comes into contact with, an inlet is provided in the storage tank, and a bottom surface is formed that gently slopes from the inflow port toward the arcuate bottom surface of the water storage tank. A discharge port is provided on one side, and one side of the housing is provided to be watertight with a side wall of a storage tank, and the water storage tank is connected to a filtrate tank from which filtrate flows out. .

(Function) With this configuration, the sewage mixed with foreign matter that enters from the inlet is swept along the bottom surface of the tank, which is gently sloped from the inlet toward the arcuate bottom surface of the water tank, along with the foreign matter. flows into. The foreign matter then passes through the mesh and enters the inside of the casing from the bottom to the top, but since it passes through the mesh, the foreign matter does not enter into the housing. In addition, since foreign matter adheres to the underside of the screen, it is easy to fall off and clogging is less likely to occur. In addition, the rotating cylindrical casing rotates at a low speed, and the scraping plate on the outer periphery comes into contact with the arcuate bottom surface while discharging foreign matter that has settled at the bottom of the storage tank. does not decrease. Further, the liquid leached into the housing flows into a filtrate tank connected to the storage tank through a discharge port provided on one side of the housing, and further flows out from the filtrate tank. In this way, filtration is carried out continuously.

(Example) An example of the present invention will be described below with reference to the drawings. In Figs. 1 to 3, the strainer 20 has a storage tank 2.
1, and the dirty liquid containing foreign matter flows in from the inlet 22. A bearing 23 is provided in the storage tank 21.
A rotating cylindrical housing 25 is pivotally supported by a rotating shaft 24, and the rotating cylindrical housing 25 is provided with a discharge side wall disk 26 and a closing side wall disk 27. A circular mounting plate 26a is fixed to the inner side of the discharge side wall disc 26, and a circular connecting plate 26b is fixed to the outer side thereof, and a circular mounting plate 27a is fixed to the inner side of the closing side wall plate 27. The auxiliary disk 2 is attached to the circular connecting plate 26b.
8 is attached to the outside. Also circular mounting plate 2
There is a connecting rod 29 connecting the connecting rods 6a and 27a, and a filtering net 30 is stretched over the circular mounting plates 26a and 27a and the connecting rod 29 along the outer peripheral surface of the housing 25. Also, a scraper plate 3 is attached to the peripheral edge of the side wall discs 26 and 27.
1 are arranged radially at appropriate intervals, project slightly from the peripheral edges of the side wall disks 26 and 27, and are adjustable. A part of the bottom of the storage tank 21 forms an arcuate bottom surface 32 whose central axis is the rotating shaft 24 of the casing 25, and the scraper plate 31 comes into contact with the arcuate bottom surface 32; Scraping board 3
1 rotates along the arcuate bottom surface 32 with a slight gap at the tip.

Further, the structure of the discharge side side surface of the housing 25 is rather complicated. Both the side wall disk 26 and the auxiliary disk 28 have the same shape, and have discharge ports 33, 3 for draining excess liquid therein.
4 each has a large opening. Also, storage tank 2
The discharge side side wall of No. 1 is connected to the adjacent discharge liquid tank 35, so the outer partition plate 36 and the inner partition plate 3
The outer partition plate 36 and the inner partition plate 37 have an auxiliary disk 28 inserted thereinto to form a watertight structure. The discharge liquid tank 35 has an outlet 3.
8 is installed and the excess liquid flows out, so the housing 2
The side surface of 5 is connected to the outlet.

Note that the bottom of the storage tank 31 is a bottom surface 39 that is gently sloped toward the inlet 22 except for the arcuate bottom surface 32 . In this embodiment, the arcuate bottom surface 32 forms a quarter circle, and a foreign matter outlet 40 is provided at the upper part of the quarter circle. A scraper 4 is provided at the foreign matter discharge port 40.
1 is supported by a support shaft 42 so as to be vertically movable. The scraper 41 engages with the scraper plate 31 and discharges the foreign matter scraped up by the scraper plate 31 from the foreign matter discharge port 40, and is operated by a stopper 43 fixed to the foreign matter discharge port 40. , is restrained from moving downward from the horizontal position.
Further, a backwash nozzle 44 is provided inside the casing 25 and is disposed through a through hole formed in the rotating shaft 24.

In this embodiment, the casing 25 is a rotating cylindrical body, but if the outer circumferential surface has a mesh and the scraper plate attached to the outer periphery is in contact with the arcuate bottom surface 32 of the storage tank, the casing 25 can be used. can be of any shape.

The dirty liquid and the like after cleaning the processed parts with the washer passes through the inlet 22, flows along the gently sloping bottom surface together with foreign matter, and flows into the vicinity of the lower part of the housing in the storage tank 21. Inside the storage tank 21 is a cylindrical housing 25.
is rotatably supported by a bearing 23 fixed to the storage tank 21, the waste liquid passes through the mesh 30 on the outer periphery of the casing and infiltrates into the casing, but only the supernatant passes through the mesh 30 and enters. Foreign matter such as chips and chips remain in the lower part of the storage tank 21. Since the cylindrical casing 25 rotates at low speed around the rotating shaft 24 by a drive device (not shown), the foreign matter in the lower part of the storage tank 21 is removed by the scraping plate 31 disposed on the outer periphery. The figure can be scraped left and right, and the scraping board 31 is in the left half.
rotates while contacting the arcuate bottom surface 32 of the storage tank 21, so it scrapes up foreign matter such as chips,
Push it up to the foreign matter discharge port 40. A scraper 41 is provided at the foreign matter discharge port 40, and when the scraping plate 31 comes to the foreign matter discharge port 40, the scraper 41 is disposed at the foreign matter discharge port 40.
It comes into contact with the top of the scraping board 31. And scraping board 31
As the scraper 41 rises, the scraping plate 3
1 from right to left in the figure, and the foreign matter on the scraper plate 31 is lifted up while falling into the foreign matter discharge port 40. When the scraping board 31 reaches the horizontal position, the scraper 41 separates from the scraping board 31,
The scraper 41 falls to the stopper 43 and waits for the next scraping board to arrive. The foreign matter scraped up along the arcuate surface 32 by the scraping plate 31 is successively discharged from the foreign matter discharge port 40.

The supernatant liquid that has entered the inside of the housing 25 is discharged through the discharge ports 33 and 34, which are provided in the side wall disc 26 and the auxiliary disc 28 on the discharge side wall of the housing 25. The liquid flows into the liquid tank 35. Then, it is discharged from the outlet 38.

Also, clean liquid is intermittently sprayed from the backwash nozzle 26. As a result, some foreign matter adhering to the surface of the screen 30 is also removed, and the surface of the screen 30 is always kept clean and does not become clogged.

(Effects of the invention) Since the present invention has the above-mentioned configuration and function, it has a simple structure and can always perform filtration in good condition without causing excessive mesh clogging. , the manufacturing cost and maintenance cost of the strainer can be reduced. In addition, the waste liquid is supplied to the lower part of the storage tank, and the waste liquid is passed from the bottom to the top.
The inlet for sewage liquid can be installed at a low location.
It also has the advantage that it can be applied to cleaning machines and the like where the waste liquid discharge port is low.

Furthermore, since the bottom surface of the storage tank is gently sloped from the inlet to the arcuate bottom surface, foreign matter mixed into the sewage flowing into the storage tank remains directly below the housing and flows from the inlet into the storage tank. The sewage that enters also stably stays at the bottom, making it easier to obtain a supernatant liquid. Further, since one side of the housing and the side wall of the storage tank have a watertight structure, foreign matter in the storage tank does not flow into the filtrate tank.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a sectional view, Fig. 3 is a view taken in the direction of the arrows, Fig. 4 is a partially enlarged view of Fig. 2, and Fig. 5 is a conventional rotary strainer. is a front view, and FIG. 6 is a sectional view thereof. 20...Strainer, 21...Storage tank, 25...
... Rotating cylindrical casing, 30 ... Filtering net, 31 ... Scraping plate, 32 ... Arc-shaped bottom surface, 35 ... Discharge filtrate tank.

Claims (1)

[Scope of utility model registration request] A casing with a filter net stretched over its outer circumferential surface is rotatably supported in a storage tank, and scraping plates are radially attached to the outer periphery of the casing, and a part of the bottom of the storage tank is attached to the casing. The water tank is formed on an arcuate bottom surface that the scraping plate comes into contact with and has a center axis that is the same as the center of rotation of the water tank, and an inlet is provided in the reservoir tank, and the water flows gently from the inlet toward the arcuate bottom surface of the water storage tank. A slanted bottom surface is formed, a discharge port is provided on one side of the casing, and one side of the casing is provided to be watertight with a side wall of a storage tank, and the filtrate from which the filtrate flows out is connected to the water storage tank. A rotary strainer characterized by being connected to a tank.