JPH0661636B2 - Screen residue dehydrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention conveys a screen residue scraped and removed from a water channel of a sewage treatment plant, a pumping station, etc. to a predetermined position while dehydrating it in a duct. It is about.

[Conventional technology]

Conventionally, the screen residue collected from a sewage treatment plant has a high water content, and it is troublesome for subsequent treatment to put it into a hopper or put it into an incinerator in a collected state. Therefore, it is necessary to dehydrate the collected screen residue until the water content falls below a predetermined water content. Conventionally, dehydration of the screen residue is carried out by a dehydrator, and the screen residue after dehydration is carried by a carry-out machine to a hopper or an incinerator.

Further, Japanese Patent Publication No. 46-26285 discloses a method in which a screen residue is supplied into a closed duct, pressure-dehydrated by a Punlanger, and then pressure-fed.

[Problems to be Solved by the Invention]

After the screen residue is dehydrated with a dehydrator, this method of transporting it to a predetermined position with a transporter requires a large space for equipment installation, and it is difficult to maintain and seal these equipments. Because it is a type, the odor is scattered,
It causes the work environment to deteriorate.

On the other hand, the method of performing pressure dehydration in a closed duct and transporting it as it is is excellent. By the way, a round hole or a long hole for draining water is usually drilled at the downstream port of the screen residue input port of this transport duct. When it enters into, it is clogged and the dehydration effect is reduced. If this clogging occurs, it becomes impossible to dehydrate, so it is necessary to frequently clean the dehydrating part of the duct, which is troublesome.

An object of the present invention is to provide a screen residue dehydrator which is less likely to be clogged and can be easily cleaned.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is a screen residue dewatering machine for squeezing a screen residue put into a squeezing chamber with a plunger, a screen residue input port at a plunger stroke starting portion of the squeezing chamber, and a plunger stroke end. In the part, a screen bar for draining formed by arranging a screen bar with a rectangular cross section in an annular shape with a predetermined pitch is provided,
In addition, the gist is that the plunger is configured to slide beyond the end of the screen bar of the drainage screen.

Further, it is desirable that the drainage screen is detachably provided in the compression chamber.

[Work]

According to the present invention, the drainage screen is formed by arranging a screen bar having a rectangular cross section in an annular shape at a predetermined pitch, so that clogging occurs as compared with the conventional drainage holes. Hateful.

Moreover, since the plunger is configured to slide beyond the end of the screen bar of the drainage screen, it is possible to shear or squeeze the screen residue caught on the screen bar of the drainage screen by the plunger. It is possible to prevent clogging more easily.

Furthermore, when the drainage screen is detachably provided in the compression chamber, the drainage screen can be detached from the compression chamber for cleaning.

〔Example〕

 The present invention will be described below based on the illustrated embodiments.

A screen residue collected from a sewage treatment plant, a pump station, or the like is continuously or intermittently transferred, and a hopper 2 for supplying the screen residue is disposed below the end of the transfer means 1.

The pressurizer 3 for pressurizing and dehydrating the screen residue supplied from the hopper 2 includes a cylindrical main body 31 whose one end is bent upward at a required angle, and a hydraulic cylinder 32a housed in a horizontal portion of the main body 31. And a pressing means 32 having a plunger 32b, and a squeezing chamber 34 is formed inside the tubular main body 31 in front of and behind the pressing means 32.

Plunger 32b in the compression chamber 34 of the main body 31
A screen residue input port 3H is formed at the plunger stroke starting portion, and the hopper 2 is connected above this.
The discharge port at the bottom of the hopper 2, that is, the screen residue input port 3H is shorter than the stroke of the plunger 32b.

Then, a dehydration hole 32H may be formed in the main body 31 at a lower position of the hopper 2, if necessary, so as to drain water contained in the screen residue.

Draining screen 7 at the end of the plunger stroke
The back pressure plate 6 swinging by the pressurizing cylinder 6S is provided at the front of the duct 5 or the bent portion of the main body 31 to configure the dehydration unit 4. The dehydrating section 4 squeezes the screen residue by the pressurizing means 32 and raises the pressing force to a value necessary for dehydration. Even when the plunger 32b retracts, the pressurized state is maintained for a predetermined time.

The back pressure plate 6 is pivotally supported on the screen residue transport path so as to swing by the pressure cylinder 6S, and is provided so as to constitute a part of the wall surface of the screen residue transport path when opened.

The cylindrical drain screen 7 has flanges 71a and 71b at both ends as shown in the drawing, and a screen bar 72 having a rectangular cross section is annularly arranged at a predetermined pitch between the two facing flanges 71a and 71b. To form one body, and to form the locking holes 73, 73 in the flanges 71a, 71b, the main body 3
The flange 33 provided on the first side and the flange 51 provided on the duct 5 side are connected by pins or bolts 8 and 8, respectively.
That is, the drainage screen 7 is arranged and fixed between the main body 31 and the duct 5 with two pins or bolts 8 and 8.

The flanges 71a and 71b of the drainage screen 7 are ring-shaped, and the inner peripheral surface of the flange 71a or the flange 71a.
The screen bar 72 is brought into contact with the inner surface of b, and the flange 7
The intersections of 1a, 71b and the screen bar 72 are welded to be integrated. In this case, since the screen bar 72 uses a flat plate member having a rectangular cross section, if it is arranged in an annular shape in the radial direction, as shown in FIG. 5, the gap between the adjacent screen bars 72 is on the inner peripheral side. Narrow and wide on the outer peripheral side. Therefore, during pressure dehydration, even if a part of the screen residue is pushed into the gap between the adjacent screen bars 72, the gap on the outer peripheral side is wide, and therefore the screen residue easily passes through the gap between the screen bars 72 and the draining screen 7 It will pass to the outside of the vehicle and clogging will be prevented.

Further, when the drainage screen 7 is clogged, either the left or right pin or bolt 8 is pulled out, and the pin or bolt 8 on the opposite side is used as a pivot for setting the entire drainage screen 7 to the second position.
By swinging as shown in the figure, the drainage screen 7 can be detached, and the interior of the drainage screen 7 can be easily cleaned. For assembling, this drainage screen 7 may be swung in the opposite direction to the above, and the pin or bolt 8 may be inserted. It is desirable to dispose a cover 74 that covers the drainage screen 7.

6 and 7 show different embodiments of the drainage screen. In this embodiment, the flanges 71c and 7c
2d is formed in a semi-circular shape, and the connecting member 71 is divided into two parts.
The flange 33 provided on the main body 31 side and the flange 51 provided on the duct 5 side are the pins or bolts 8 that are inserted into this flange, as in the previous embodiment. In this embodiment, the flanges 71c and 72d of the drainage screen can be divided into two parts, so that cleaning can be performed more easily.

In any of the above-described embodiments, the plunger 32b is designed to slide beyond the end of the screen bar 72 of the drainage screen 7, that is, the tip of the plunger 32b overlaps the flange 71b of the drainage screen 7. Set the jar stroke. Thereby, the screen residue caught on the screen bar 72 of the drainage screen 7 can be sheared or squeezed by the plunger 32b, and clogging can be made less likely.

In this case, since the screen bar 72 is in contact with the inner surface of the flange 71b, the screen residue is satisfactorily sheared by the tip of the plunger 32b and the inner peripheral end corner of the flange 71b.

[Effects of the Invention] According to the present invention, since the water draining screen formed by arranging the screen bar having a rectangular cross section in the annular shape at a predetermined pitch in the water draining screen is used, compared with the conventional water draining holes. It is possible to prevent clogging from occurring.

Further, since the plunger is configured to slide beyond the end of the screen bar of the drainage screen, the plunger can shear or squeeze screen residue caught on the screen bar of the drainage screen, It is possible to make clogging less likely to occur.

Furthermore, when the drainage screen is detachably provided in the compression chamber, the drainage screen can be detached from the compression chamber for cleaning.

Therefore, the working efficiency of the screen residue dehydrator can be improved.

[Brief description of drawings]

FIG. 1 is a front sectional view of a screen residue dehydrator, FIG. 2 is a longitudinal side view of a draining screen portion, FIG. 3 is a view showing a draining screen, (a) is a left side view, (b) ) Is I
-I cut end view, (c) right side view, (d) II-II
FIG. 4 is a perspective view of the drainage screen, FIG. 5 is an enlarged view of the screen bar, FIG. 6 is a front sectional view of a different embodiment of the drainage screen, and FIG. 7 is III-I.
A sectional view of the II cut portion, FIG. 8 is an external view of the entire screen residue dehydrator. 2 is a hopper, 3 is a pressurizer, 3H is a screen residue input port, 31 is a main body, 32a is a hydraulic cylinder, 32b is a plunger, 34 is a squeeze chamber, 4 is a dehydration section, 5 is a duct,
6 is a back pressure plate, 7 is a drainage screen, 71 is a flange,
72 is a screen bar, 8 is a bottle or bolt.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-268896 (JP, A) Actually opened 55-49894 (JP, U) Actually opened 57-17292 (JP, U) JP-B 46- 26285 (JP, B1) JP-B 57-43049 (JP, B2)

Claims (2)

[Claims] 1. A screen residue dewatering machine for squeezing a screen residue introduced into a squeezing chamber (34) with a plunger (32b), wherein a screen residue introducing port ( 3H)
A water draining screen (7) formed by arranging a screen bar (72) having a rectangular cross section in an annular shape at a predetermined pitch is provided at the end of the plunger stroke, and the plunger (32b) is the water draining screen (7). ) The screen residue dehydrator, which is configured to slide beyond the end of the screen bar (72). 2. The drainage screen (7) is detachably provided in the compression chamber (34).
Screen residue dehydrator described.