JP2582041B2 - Rotary drum screen cleaning equipment for sewage pretreatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum screen cleaning device for a sewage pretreatment device. In this specification, "sewage" includes sewage, night soil,
Wastewater and sludge shall be included.

[0002]

2. Description of the Related Art A rotary drum screen of a sewage pretreatment apparatus supplies sewage into a drum screen, allows water to flow down from a gap between screens, and receives and filters impurities in sewage by a screen. is there. The contaminants move upward in the direction of rotation with the rotation of the drum screen along with the rotation of the drum screen, and when the movement angle increases, it rolls back to its original position under its own weight, and grows in a rod shape by repeating this operation, It becomes a rod-shaped filter cake and
It is discharged out of the screen. By the way, if the sewage pretreatment device is continuously used, the screen is clogged with foreign substances. Conventionally, in order to remove the clogging, hot water is applied to the drum screen with a hose or the drum screen is rubbed with a scourer.

[0003]

However, sewage discharged from fish and meat shops, restaurants, public markets, etc., contains a large amount of fats and oils, so if the impurities cause clogging of the screen, This sticks to the screen and is very difficult to remove. In such a case, the contaminants must be scraped off from the screen with a comb or decomposed and washed off by applying a caustic soda on the screen. SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary drum screen cleaning apparatus of a sewage pretreatment apparatus capable of automatically and surely removing even foreign substances including fats and oils that cause strong clogging of a screen.

[0004]

Rotary drum screen cleaning apparatus of the invention by sewage pretreatment apparatus according to claim 1 Means for Solving the Problems], due horizontal rotary shaft is brought supported in a cantilever one end closed
Built-in drum screen, chained and open at the other end, with filtrate and untreated liquid outlets at the bottom
And a washing nozzle having a slit parallel to the axis of the drum screen and jetting a fluid having a temperature of 20 to 100 ° C. at a pressure of 30 to 100 kg / cm ^2. tip of the fluid pumping tube, with placed from outside the casing through a slit in the casing, the cleaning nozzle is closed demanded toward the drum screen, as fluid pumping tube can reciprocate slit moving body Fluid pressure
Has a horizontal cut for flue movement, from the drum screen
In the dirty state, the splashed liquid leaks out of the casing.
When the slit is covered with a waterproof sheet that prevents it from coming out
The position of the cleaning nozzle is above and below the slit.
It is shifted to either one .

[0005] The wastewater pretreatment device according to the second aspect of the present invention
Rotary drum screen cleaning equipment
While one end supported more cantilever is closed
Built-in drum screen with open end
And a filtrate outlet, untreated solution outlet and filter cake outlet at the bottom.
The fixed casing is provided with a slit
It is opened parallel to the axis of the lean and the temperature is 20 ~ 100 ℃
Washing with a pressure of 30-100 kg / cm ²
The tip of the fluid pumping pipe with the cleaning nozzle is
When put in the casing through the slit from outside
First, the cleaning nozzle faces the drum screen.
So that the fluid delivery tube can reciprocate through the slit.
Are connected to the moving body, and the slits
With a width equal to the width of the slit and the length of the slit
The tank is arranged and fixed to the casing.
The upper edge of the cartridge is positioned below the liquid level,
A U-shaped bent part is formed in the fluid pressure feed pipe, and the bent part is
It is housed in the liquid tank avoiding the upper edge .

[0006] By setting the temperature of the ejected fluid in the range of 20 to 100 ° C and the same pressure in the range of 30 to 100 kg / cm ² , it is possible to remove oil and fat-containing contaminants that have clogged the screen. Becomes This is difficult if the amount is less than the above lower limit, and exceeding the upper limit is unnecessary and uneconomical. Particularly preferably in each of the above ranges, the temperature of the ejected fluid is 30 to 40 ° C. and the pressure is about 60 k.
g / cm ² . As the fluid, any of a liquid and a gas may be used. In the case of a liquid, water is generally used, but cleaning water containing a surfactant or soda may be used. When the washing water is used, a lower temperature and pressure within the above ranges is sufficient. In the case of a gas, air is generally used, but nitrogen gas, mist, or the like can also be used.

[0007] The cleaning time may be 30 to 120 minutes. It is usually sufficient for the moving body to make one reciprocation, but if the clogging is strong, the moving body is reciprocated a plurality of times. The rotation speed of the drum screen is 1 to 3 rpm, and the moving speed of the moving body is 25 to 100 mm / min.

[0008] The slit of the fixed casing is opened continuously when the drum screen width is short.
If the screen width is long, it is not preferable to open the screen continuously because of the strength of the casing. Then, the number of fluid pumping tubes and moving bodies is made to correspond to the number of slits. One or more washing nozzles are provided for each fluid pressure feed pipe. The length of the slit is such that the fluid spans the entire width of the drum screen.

For the waterproof sheet, it is preferable to use a material having a restoring force and a good sealing property, and specific examples thereof include rubber. Water is generally used as the liquid filled in the liquid tank.

[0010]

The rotary drum screen cleaning device of the sewage pretreatment device according to the first and second aspects of the present invention is characterized in that one end supported in a cantilever manner by a horizontal rotating shaft is closed.
It has a built-in drum screen, the other end of which is open, and a filtrate outlet, an untreated liquid outlet, and a cake drain at the bottom.
In the fixed casing with the mouth , the slit
It is opened parallel to the axis of the screen and the temperature is 20 to 10
The tip of a fluid pumping pipe having a washing nozzle for ejecting a fluid at 0 ° C. at a pressure of 30 to 100 kg / cm ² is inserted into the casing from the outside of the casing through a slit, and the washing nozzle is directed toward the drum screen. occupied demanded, since it is intended to fluid pumping tube is brought coupled to moving body so as to be able to reciprocate slit, to rotate the drum screen, while reciprocating the fluid pumping tube cleaning nozzle By ejecting the fluid at the above-mentioned temperature and pressure, impurities including fats and oils that have caused strong clogging of the drum screen can be removed.

[0011] In the case of the invention of claim 1, have a horizontal cut for moving fluid pumping tube, stain from the drum screen
Spray liquid leaks out of the casing
The slit of the casing is covered with a waterproof sheet which prevents the casing from being damaged, and in the case of the invention of claim 2, the slit of the casing has a width equal to the width of the inside and outside and the length of the slit. Is disposed and fixed to the casing, the upper edge of the slit is positioned below the liquid level, and a U-shaped bent portion is formed in the fluid pressure feed pipe, and the bent portion is located above the slit. The slit is sealed by being stored in the liquid tank avoiding the edge .

Further, according to the first aspect of the present invention, the position of the washing nozzle is shifted to one of the upper side and the lower side of the slit of the casing, so that the fluid ejected to the drum screen and rebounded from the drum screen is It will hit the place off the slit.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the embodiment, the left and right correspond to the left and right of FIGS. 1 and 2, and the front corresponds to the lower side of FIG.
The rear means the upper side of FIG.

The rotary drum screen cleaning device of the sewage pretreatment device shown in FIGS. 1 to 5 has a horizontal rotating shaft.
Drum screen supported cantilevered by (1)
In the fixed casing (3) in which (2) is built, a slit (4) having a length approximately equal to the width of the drum screen is opened in parallel with the axis of the drum screen (2). Nozzle that jets at a pressure of 60 kg / cm ²
The tip of the fluid pressure feed pipe (6) having (5) is the casing
From the outside of (3) through the slit (4) into the casing (3), the washing nozzle (5) is looked up toward the drum screen (2), and the fluid pressure pipe (6) is slit. (4) those that are not connected to the moving body (7) so as to be able to reciprocate.

[0015] slits of the fixed casing (4) is to have a fluid pumping tube moving horizontal cut (8), drum screens
The spray liquid that has rebounded when it is dirty from the outside of the casing
It is covered with a rubber waterproof sheet (9) that prevents leakage, and the position of the washing nozzle (5) is shifted below the slit (4).

The fixed casing (3) is closed at both ends, has a cylindrical cross section concentric with the drum screen (2), and has a frame base (10) having a motor base (35) at the right end. Is attached via a support member (11). Horizontal sewage supply pipe (1
2) extends to the upper after the left opening portion of the casing (out of the casing (3) Input Les al <br/> are in the drum screen in the 3) (2), a drum screen (2) in It is connected to the communication like the protrusion of the connected square tubes on the left end (14) of the sewage gutter (13) extending in the width direction. The sewage gutter (13) is a drum
The screen (2) extends close to the right end closure (2a). Each end of the sewage gutter (13) and square pipe (14) is closed,
The latter end is connected to a hanging member (15) provided in a hanging manner on the upper part of the casing (3). The height of the rear wall of the sewage gutter (13) is lower than the front wall to form an overflow section (16), and the sewage is guided to the upper inner edge of the drum screen (2) at the upper edge of the rear wall. Rear downward inclined guide to do (17)
Is provided. At the upper front of the drum screen (2), an inclined plate (18) extending in the width direction and inclined forward and downward from near the upper end of the drum screen (2) to near the middle of the front thereof is arranged. I have. The inclined plate (18) is a support member with its left end protruding from the opening of the drum screen (2).
The entire lower surface is supported by (19), and the support member (19)
Is connected to a hanging member (20) provided in a hanging manner on the upper part of the casing (3). casing
At the bottom of the center line of (3), the drum screen (2)
The untreated liquid outlet (22) is provided on the left side of the partition wall (53) located below the left end of the sewage gutter (13) on the left side near the opening (2a). I have. If the screen becomes clogged and cannot be filtered, the untreated liquid wraps around the open portion of the drum screen to the outside and reaches the untreated liquid outlet (22), from where it enters the wastewater supply tank (not shown). Will be returned. The casing (3) slightly protrudes to the left from the base (10), and a filter residue outlet (23) is provided at the protruding portion and at the bottom part which is forward from the center line of the drum screen (2). ing. On the outside of the opening of the drum screen (2), there is disposed a chute (24) for dropping the cake from the lower half of the drum to the cake outlet (23), which is fixed to the casing (3).

Sewage flows into the gutter (13) from the supply pipe (12) through the square pipe (14), overflows from the overflow section (16), is guided by the inclined guide section (17), and is conveyed to the drum. It flows down to the inner surface of the screen (2). Then, the contaminants in the sewage are received by the screen, and only the water passes through the gap therebetween and is collected at the filtrate outlet (21). In FIG. 3, the contaminants remaining in the drum screen (2) move clockwise together with the clockwise rotation of the drum screen (2), and due to their own weight above the inclined plate (18). It falls on the inclined plate (18).
Dropped contaminants are transferred from the inclined plate (18) to the drum screen.
(2) Sliding down on the inside, but again the drum screen
With the rotation of (2), it reaches above the inclined plate (18) and performs the above operation. As the impurities repeat this operation, the same impurities gradually adhere to the surroundings to form a rod. drum·
The screen (2) is slightly inclined to its open side and constantly rotates clockwise during sewage pretreatment.
At the position (1), it comes out of the opening of the drum screen (2), is guided by the chute (24), and falls to the filter cake outlet (23).

As shown in detail in FIG. 4, a mounting plate (25) having a plurality of screw holes at predetermined intervals is welded to the outer surface of the outer edge of the slit (4) of the casing (3). The waterproof sheet (9) is sandwiched between the mounting plate (25) and the holding plate (26), and the fixing bolt (27) is attached to the holding plate (26) and the waterproof sheet.
The waterproof sheet (9) is fixed at a predetermined position by being screwed into the screw hole of the mounting plate (25) through the bolt through hole drilled in (9). Mounting plate (25), waterproof sheet (9)
The holding plate (26) has the same shape as the frame. A shield plate (28) having a rectangular shape having a vertical length larger than the width of the slit (4) and having a forwardly downwardly inclined portion at the lower end is provided with a horizontal portion of the fluid pressure pipe (6) inside the casing (3). (6
a) A horizontal cleaning nozzle mounted vertically at the rear end
(5) Reciprocating with. Mounting plate (2
5) Stainless steel is used for the holding plate (26) and the sheathing plate (28). In the fluid pressure pipe (6),
A relatively short drooping portion (6b) is provided following the rear end of the horizontal portion (6a) to displace the washing nozzle (5) below the slit (4). A rubber waterproof apron (29) is arranged between the entire slit (4) and the drum screen (2). The waterproof apron (29) is a hollow bar (30) fixed to the left and right walls of the casing (3).
Is suspended via a suspension member (31). A relatively long hanging part (6c) is provided following the front end of the horizontal part (6a) of the fluid pressure feed pipe (6). The moving body (7) is a vertically long rectangular parallelepiped with a horizontal through hole for weight reduction, and a vertical portion of an inverted L-shaped upper mounting plate (32) is bolted to an upper part of the front surface thereof. The lower part (6c) penetrates the hole made in the part. On the lower surface of the moving body (7), a horizontal lower mounting plate (33) is projected forward so as to be parallel to the horizontal portion of the upper mounting plate (32), and is bolted to the lower mounting plate (33). The lower end of the lower front part (6c) is welded. The lower mounting plate (33) is provided with a hole communicating with the hanging part (6c), and the rubber hose (34) is connected to the hanging part (6c). The lower end of the rubber hose (34) is a rotary joint
It is connected to a fixed pipe (37) via (36), and the pipe (37) is led to a high-pressure hot water pump (not shown).

A horizontal through hole is formed above and below the moving body (7), the upper hole is movably fitted to a horizontal cylindrical three-dimensional cam (38), and the lower hole is moved to a horizontal guide rod (39). It is fitted freely. As shown in detail in FIG. 5, the cam groove (40) of the three-dimensional cam (38) has two spiral grooves (4
0a) and (40b) are provided so as to cross each other sequentially and are continuous at both ends. A vertical hole (41) leading to the three-dimensional cam (38) is formed at the upper end of the moving body (7), and a cam follower (42) is rotatably housed in the vertical hole (4).
The upper end opening of 1) is closed by a lid (43). cam·
The follower (42) is a disk part (42a) that rotates in the vertical hole (41).
And a claw (42b) fitted in the cam groove (40) and having a tip formed in a concave arc shape. Both ends of the three-dimensional cam (38) are connected to a pair of left and right side walls (4) of a frame fixed to the outer surface of the casing (3).
It is rotatably mounted on the upper part of 4) via a bearing, and both ends of the guide rod (39) are fixed to the lower part of the both side walls (44). On the motor stand (35), a drum / screen rotation motor (45) having an output shaft pointing right and a three-dimensional cam rotation motor (46) having an output shaft pointing left are arranged. The rotational force of the former motor (45) is transmitted to the horizontal rotating shaft of the drum screen (2) by the chain / sprocket power transmission mechanism (47).
(1), and the torque of the latter motor (46) is transmitted to the right side wall (4) via the chain / sprocket power transmission mechanism (48).
4) The horizontal rotation axis (4
9).

Now, a moving body having a cam follower (42)
It is assumed that (7) is at the right end of the three-dimensional cam (38). When the three-dimensional cam (38) is rotated by the motor (46), the moving body (7) having the cam follower (42) is guided by one spiral groove (40a) and moves to the left end of the three-dimensional cam (38). . As a result, the fluid pressure feed pipe (6) having the cleaning nozzle (5) moves from the right end to the left end of the slit (4). When the cam follower (42) passes the left end of one spiral groove (40a), its claw (42b) changes direction and moves to the other spiral groove (40b), and the three-dimensional cam (42) rotates. No mobile (7) with cam follower (42)
It is guided by the other spiral groove (40b) and moves to the right end of the three-dimensional cam (38). As a result, the fluid pressure feed pipe (6) having the cleaning nozzle (5) moves from the left end to the right end of the slit (4).
When the cam follower (42) passes the right end of the other spiral groove (40b), its claw (42b) changes direction and one of the spiral grooves (4
Move to 0a). By repeating this operation, the fluid pressure pipe (6)
Reciprocates the slit (4) repeatedly. Drum screen
While rotating (2) by the motor (45), 40 ° C. hot water was applied to the outer surface of the rotating drum screen (2) from the washing nozzle (5) of the fluid pressure feed pipe (6) moving as described above.
Jet at a pressure of 0 kg / cm ² . Then, even if the gap between the screens is clogged with foreign substances including oils and fats, these are reliably removed and washed away. In the drawing, (50) is a cover that covers the cleaning device.

In the above embodiment, only one washing nozzle (5) is provided at the tip of the fluid pressure feed pipe (6), but a plurality of washing nozzles may be provided.

In the above embodiment, the fixed casing
The slit (4) of (3) is sealed by the waterproof sheet (9), but the slit (4) may be liquid-sealed. That is,
As shown in FIG. 6, the slit (4) is provided with a liquid tank (51) having a width spanning inside and outside thereof and a length equal to the length of the slit (4). The slit upper edge (4a) is positioned below the liquid surface (52), and a U-shaped bent portion (6d) is formed in the fluid pressure feed pipe (6), and the bent portion (6d) is formed. Is stored in the liquid tank (51) avoiding the slit upper edge (4a), whereby the slit (4) is liquid-sealed. The washing nozzle (5) is horizontally mounted on the tip of the bent portion (6d) inside the casing (3), and is located at a position shifted above the slit (4). The liquid tank (51) is filled with water.

In the above embodiment, the fixed casing
Although one slit of (3) exists continuously, two slits (54) may be intermittently formed in the casing (3) as shown in FIG. In this case, the fluid pressure feed pipe (56), the moving body (57) and the three-dimensional cam (5
8) There are two numbers. The distal end of each fluid pressure feed pipe (56) extends left and right, and cleaning nozzles (55) are provided on both sides thereof. The left and right three-dimensional cams (58) are each coupled (5
9) and connected to the intermediate rod (60),
8) is designed to rotate together. In the figure,
(62) is a long drum screen, and (63) is a fixed casing accommodating it. Other parts that are the same as those in FIG. 1 are given the same reference numerals and description thereof is omitted. It is also possible to further increase the number of slits, fluid pumping tubes, moving bodies and the like from that of FIG.

[0024]

According to the rotary drum screen cleaning apparatus of the wastewater pretreatment apparatus of the present invention, while the drum screen is rotated and the fluid pressure pipe is reciprocated, the temperature of the cleaning nozzle is 20 to 100 ° C. 30 fluids
By ejecting at a pressure of ~ 100 kg / cm ² ,
Even foreign substances including fats and oils that have caused strong clogging of the screen can be removed, so that the drum screen can be automatically and reliably washed.

When the fluid ejected to the drum screen is a liquid, the fluid is discharged in a dirty state.
Since the seal is formed so as to prevent it from repelling from the clean and coming out of the casing through the slit of the fixed casing , dirty liquid does not leak out of the casing.

Further, the position of the washing nozzle is fixed.
The liquid ejected from the drum screen hits the place off the slit by being shifted to either the upper side or the lower side of the slit of the cartridge. Does not leak out, and the sewage pretreatment device can be kept clean.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a drum and screen cleaning device of a sewage pretreatment device according to the present invention.

FIG. 2 is a partially cutaway front view of the drum and screen cleaning apparatus of FIG. 1;

FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2;

FIG. 4 is an enlarged cross-sectional view showing a main part of the drum / screen cleaning device of FIG. 1;

FIG. 5 is a partially enlarged front view of a three-dimensional cam and a cam follower.

FIG. 6 is an enlarged cross-sectional view showing a modified example of the seal portion of the slit.

FIG. 7 is a plan view of an essential part with a part cut away showing an embodiment in which the number of slits, fluid pressure feeding pipes and moving bodies is plural.

[Explanation of symbols]

(1): Horizontal rotating shaft (2) (62): Drum screen (3) (63): Fixed casing (4) (54): Slit (5) (55): Wash nozzle (6) (56): Fluid pumping tube (6a): U-shaped bent part of fluid pumping tube (7) (57): Moving body (8): Horizontal cut for moving fluid pumping tube (9): Waterproof sheet (21): Filtrate outlet (22) : Untreated liquid outlet (23): Filter cake outlet (51): Liquid tank (52): Liquid level

Claims (2)

(57) [Claims] 1. A dram screen, which is supported by a horizontal rotating shaft in a cantilevered manner and has a closed end and an open end, is provided at the bottom and has a filtrate outlet at the bottom.
In a fixed casing provided with a processing liquid outlet and a filter cake outlet , a slit is opened in parallel with the axis of the drum screen, and 30 to 100 kg of a fluid having a temperature of 20 to 100 ° C.
The distal end of a fluid pumping pipe having a cleaning nozzle ejecting at a pressure of / cm ² is inserted into the casing from the outside of the casing through a slit, and the cleaning nozzle is looked up at the drum screen, and the fluid pumping is performed. Contact tube is brought coupled to moving body so as to be able to reciprocate slit
With a horizontal cut for moving the fluid pressure pipe,
The jetted liquid splashed in a dirty state from the lean
Cover the slit with a waterproof sheet that prevents leakage
And the position of the cleaning nozzle is
A rotary drum screen cleaning device of a sewage pretreatment device that is shifted to either the bottom or the bottom . 2. A cantilever supported by a horizontal rotating shaft.
One end is closed and the other end is open.
Built-in ram screen and bottom filtrate outlet, no
Fixed casing with treatment liquid outlet and filter cake outlet
The slit is made parallel to the axis of the drum screen
30-100 kg of fluid with a temperature of 20-100 ° C
Pumping with a cleaning nozzle spouting at a pressure of / cm ²
The tip of the tube is inserted through the slit from outside the casing.
Washing nozzle and drum
・ Looked at the screen,
The slit is connected to the moving body so that it can reciprocate.
The slit has a width that spans inside and outside and the slit
A liquid tank having the same length as the
The upper edge of the slit is below the liquid level.
As well as a U-shaped bend in the fluid pumping tube
Formed, the bent part avoids the upper edge of the slit and
Rotary drum of sewage pretreatment equipment stored in
Screen cleaning device.