JPS6338212B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to the structure of a screen scum cleaning device, and in particular improves the conventionally used rotating drum type cleaning device to increase the crushing capacity and improve the cleaning efficiency. It is an improved version.

[Prior Art] Before the garbage contained in sewage is introduced into a pumping station or a settling basin of a sewage treatment plant, it is filtered out through a screen, and the garbage that has adhered or accumulated on the screen surface is removed. is removed from the screen surface by automatic dust scraping equipment or by hand. The garbage removed in this way is called "screen scum" or "scum", and the screen scum is temporarily stored in a hopper, then carried out by truck, etc., and disposed of in a landfill, etc. was. However, since untreated sewage, feces, sludge, etc. are attached to the screen residue, there are problems in that it produces a bad odor and sewage drips during transportation. Therefore, from the standpoint of environmental conservation, public health, or workplace hygiene, there is a shift toward cleaning screen waste to remove sewage and then dumping it. Many screen scum cleaning devices have been proposed, and some have already been put into practical use. FIG. 5 is a schematic explanatory diagram of a high-pressure water jet type cleaning device, and FIG. 6 is an explanatory diagram of a rotating drum type cleaning device. Note that FIG. 7 is a cross-sectional view taken along the line - in FIG. 6.

The high-pressure water injection type cleaning device (FIG. 5) is provided with a cleaning tank 14, into which cleaning water is fed through an inlet 17 and dirty water is discharged through an outlet 17a. On the other hand, the screen scum is thrown in from the chute 3 and floats in the washing water, and a jet fountain 15a is ejected from the high pressure water pipes 15, 15 disposed above it. The washed screen waste is then taken out by the screen conveyor 16.

On the other hand, in the rotating drum type cleaning device (FIG. 6), tires 5, 5 attached to the outer periphery of the drum 2 are supported by rollers 6, 6, and a ring gear 7 provided on the outer periphery of the drum 2 is supported by the rollers 6, 6. pinion 8 of motor 8
a, and the drum 2 is rotated by the drive of the motor 8. A screen dregs inlet is formed on one side of the drum 2 to face the chute 3, and a take-out portion 9 whose diameter is gradually enlarged is formed on the other side. A sewage extraction screen portion 10 is formed in a part of the extraction portion 9 to direct the washed sewage to the receiving chute 1.
The washed screen waste is dropped into a take-out chute 12 from the opening 10a. That is, the screen waste taken out from the sewage is introduced into the chute 3 via the conveyor 1, and flows into the drum 2 together with cleaning water sent from a water pipe 4 provided facing the inlet of the chute 3.
On the inner peripheral surface of the drum 2, a plurality of scraping blades 2a as shown in FIG. 7 (cross-sectional view) are fixed in the circumferential direction, and a large number of crushing steel balls 13 are housed. Therefore, when the drum 2 rotates, for example, in the direction of the arrow B, the steel balls 13 are lifted up by the blades 2a and fall from the upper position (height) as shown by the arrow C, and the impact of this fall causes the cleaning water to flow out. The screen scum A floating in the W is washed while being crushed, and the washed screen scum is transferred to the take-out part 9 via the scraping and steel ball stopper plate 2b (Fig. 6), as described above. The screen waste and sewage are separated.

[Problems to be Solved by the Invention] Since all of the above-mentioned types of cleaning equipment use a large amount of water to break up the screen residue, organic solids such as human excrement are not absorbed into the cleaning water. The particles float in the air and escape to a position where the crushing action cannot reach them.
It is unavoidable that human excrement and the like remain in the washed screen residue that is finally taken out. Furthermore, since these cleaning devices do not have sufficient crushing capacity, long objects such as plastic bags and clothing may pass through the device as is, and are taken out as screen scraps with dirt still mixed in. , which caused a decrease in cleaning effectiveness. Therefore, such screen waste has the disadvantage that it must be sorted and separately processed before being introduced into these cleaning devices.

That is, in a rotating drum type cleaning device, the screen scum A floating on the cleaning liquid W (see Fig. 7) is
These steel balls 13 float away from the locus of movement and remain undisintegrated. Therefore, a considerable amount of screen waste A (particularly organic solids) is taken out as it is from the opening 10a without being crushed. Furthermore, since the crushing action of the steel balls 13 is exerted by colliding with the screen scraps A,
If there are parts of the cleaning liquid W that the steel balls cannot reach, the crushing ability of the steel balls 13 will not be fully demonstrated, and even relatively large solids will be taken out without being crushed, and will be used in the subsequent dehydrator. This causes performance deterioration and malfunctions.

Further, even in the case of a high-pressure water jet type washer, the screen scum floats and moves away from the jet fountain 15a, so that sufficient disintegration is not achieved. Therefore, compared to the rotary drum type, it can only be applied to sewage treatment where there is a large amount of relatively soft screen waste.

[Means for Solving the Problems] The present invention has been made in view of these circumstances, and particularly improves the rotary drum type washer, which has a relatively large crushing capacity, to further increase the crushing capacity. It is an object of the present invention to provide a cleaning device capable of sufficiently crushing and cleaning not only soft screen dregs but also hard solid screen dregs. However, in the present invention, a cylindrical crushing section is installed concentrically and continuously on the screen waste input side of the cylindrical washing section, and a steel ball or the like for crushing is installed in the cylindrical crushing section. It is stored so that its top surface is almost at the same level as the water surface of the cylindrical crushing section, and further, the inlet diameter of the cylindrical crushing section is d ₁ , the inner diameter of the central part in the axial direction is d ₂ ,
When the outlet diameter is d ₃ , the axial center inner diameter of the cylindrical cleaning section is D ₁ , and the outlet diameter is D ₂ , d ₁ <d ₃ <
The cylindrical crushing section and the cylindrical cleaning section are respectively formed to satisfy d ₂ , d ₃ <D ₂ <D ₁ , d ₂ <D ₁ , and at least a high-pressure water pipe is provided in the cylindrical crushing section. The cylindrical crushing section is configured to inject the water toward the screen debris moving within the cylindrical crushing section.

[Operations and Examples] The present invention will be described in detail below based on the drawings, but the drawings representatively show specific examples of the present invention, and the present invention is not limited to these illustrated examples.・
In keeping with the spirit described below, the present invention can be implemented in the same manner even if parts are changed or a part of the design is changed. FIG. 1 is a cutaway side view of essential parts of the screen scum cleaning device 18 of the present invention, and FIGS. 3 and 4 are along the cutting line in FIG. 1.
FIG. 2 is a schematic vertical cross-sectional view for explaining the configuration and effects of the device of the present invention. In these figures, the cleaning device 18 of the present invention is configured with a crushing unit 20 attached to the screen sludge input side of the rotating drum type cleaning unit 19 as described above, and the axial center portion of the crushing unit 20 is The inner diameter d ₂ of the washing section 19 is smaller than the inner diameter D ₁ of the axially central portion of the washing section 19 to satisfy d ₂ <D ₁ and to integrally connect them on the same axis. Then, in the crushing section 20 and the cleaning section 19, d ₁
is the inlet diameter of the crushing section 20, _d2 is the inner diameter of the axial center of the crushing section 20, _d3 is the outlet diameter of the crushing section 20 (same as the inlet diameter of the cleaning section 19), and _D1 is the cleaning section 19 The inner diameter of the central part in the axial direction and D ₂ indicate the outlet diameter of the cleaning section 19, respectively, so that d ₁ < d ₃ < d ₂ and d ₃ < D ₂ < D ₁ so that the cleaning liquid moves in one direction. form to satisfy.

In addition, the outlet diameter d ₃ of the crushing section 20 and the inner diameter d ₂ of the central part
The water depth in the crushing section 20 is such that it is covered with steel balls 13, and by doing so, as shown in FIG.
The particles float in the cleaning liquid W and cannot escape, and are reliably crushed by the falling steel balls 13a. At this time, the effect of rubbing the steel balls 13a against each other becomes greater, so that the screen scum can fully exhibit the crushing action of the steel balls 13a. As a result, the crushing ability of the steel balls is fully exerted, and the entire purpose of crushing is almost achieved in this part, and all of the above-mentioned difficulties are eliminated. On the other hand, the portion of the cleaning portion 19 corresponding to the main body portion is expected to mainly perform the cleaning action. When connecting the crushing section 20 and the cleaning section 19, a neck section 23 is formed at the connection section. The neck portion 23 is the crushing portion 2
0, and its diameter _d3 determines the water level in the crushing section 20 (FIG. 2). Alternatively, one side of the tires 5, 5 for supporting and rotationally guiding them is moved to the outer periphery of the crushing section 20 and supported by the receiving roller 6a, and their axes are arranged horizontally. Therefore, its driving is performed by a driving means provided on the cleaning section 19 side, similarly to the example shown in FIG. 6. On the other hand, the crushing section 2
Scraping blades 20a similar to those in the cleaning section 19 are provided on the inner peripheral surface of the cleaning section 1, and a large number of crushing steel balls 13a are charged therein. Although spherical steel balls 13a are shown as the crushing steel balls 13a, the steel balls may be replaced with rod-shaped crushing impact materials, or they may be coated with an elastic material, etc. . Further, different types of materials for crushing may be arranged in the cleaning section 19 and the crushing section 20. Furthermore, in the present invention, the high-pressure water pipe 21 is installed in the crushing section 20 configured as described above, but in this installation, the high-pressure water pipe 21 is introduced through the chute 3 from the screen waste inlet of the crushing section 20. It is better to set it up. The high-pressure water pipe 21 is provided with a plurality of nozzles (four in the figure),
The jetting water 22 jetted from the nozzle is jetted toward the screen scum in the crushing section 20, particularly the screen scum that is scraped up and falling together with the steel balls 13a, and the jetting force cleans the screen scum. and assist in crushing. If necessary, the design may be changed so that all of the water jets 22 are directed in the vertical direction, or the direction of some of the nozzles is changed. Furthermore, such a water pipe 21 may be extended into the washing section 19 as shown by the broken line in FIG. 2, so that water can be supplied to the washing section 19 in the same manner as described above. .

In the rotating drum type cleaning device of the present invention configured in this way, screen waste is fed into the crushing section 20 from the chute 3 either directly or via a sorting and crushing device. Then, by rotating the drum in the direction of arrow B, the steel balls 13a are scraped up and dropped as described above, crushing the screen scum and cleaning by spraying cleaning water. The injected cleaning water flows over the neck 23 and flows into the cleaning section 19 together with the screen debris. In the crushing section 20, the water depth is shallower than in the washing section 19, so the screen scum cannot float or escape, but rolls with the steel balls 13a and receives a strong impact, resulting in insufficient disintegration. It moves to the washing section 19 while being crushed and washed. Further, it is recommended that a guide plate having the same shape as the guide plate 19b be provided on the aperture inclined surface of the neck portion 23 to prevent the steel balls 13a from moving to the cleaning section 20. As the screen portion 10b formed in the take-out portion 9 of the cleaning portion 19, an example is shown in which a relatively large vertically elongated (along the circumferential direction) through hole 10c is formed by stacking a large number of ring bodies. In this way, clogging of the screen portion 10b in the take-out portion 9 can be prevented. Further, depending on the type of screen residue, sufficient crushing and cleaning can be performed even if the scraping blades 19a and 20a provided in the cleaning device are omitted or the guide plate is removed.

[Effects of the Invention] Since the apparatus of the present invention is configured as described above, the crushing section, the washing section, and the separating section are each functionally divided and connected, so that the screen scum disintegration is performed particularly in the crushing section. The crushing effect was significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the cleaning device shown in FIG. 1,
3 and 4 are cross-sectional views taken along the cutting lines - and - in FIG. FIG. 7 is a partially cutaway side view showing the mold cleaning device, and FIG. 7 is a sectional view taken along the - line in FIG. 6. 1... Screen waste conveyor, 2... Rotating drum, 3... Chute, 4... Water pipe, 5... Tire, 6... Roller, 7... Ring gear, 8...
Motor, 9... Removal section, 10... Screen section,
11... Socket chute, 12... Removal chute,
13...Steel ball, 14...Cleaning tank, 15...High pressure water pipe, 16...Screen conveyor, 17...Introduction pipe, 18...Cleaning device, 19...Cleaning section, 20
... Crushing section, 21 ... High pressure water pipe, 22 ... Injection water, 23 ... Neck section.

Claims (1)

[Claims] 1. A screen sludge cleaning device equipped with a cylindrical cleaning section that houses a plurality of steel balls, etc. inside a cylindrical rotating drum and cleans screen scum taken out from sewage while crushing it, wherein the cylindrical A cylindrical crushing unit is installed concentrically and continuously on the screen waste input side of the washing unit, and steel balls, etc. for crushing are placed in the cylindrical crushing unit so that the top surface thereof is at the water surface of the cylindrical crushing unit. Furthermore, the inlet diameter of the cylindrical crushing section is d ₁ , the inner diameter of the central part in the axial direction is d ₂ , the outlet diameter is d ₃ , and the axial direction of the cylindrical cleaning section is When the center inner diameter is D ₁ and the outlet diameter is D ₂ ,
The cylindrical crushing section and the cylindrical cleaning section are respectively formed so as to satisfy d ₁ < d ₃ < d ₂ , d ₃ < D ₂ < D ₁ , d ₂ < D ₁ , and at least the cylindrical crushing section A screen dregs cleaning device characterized in that a high-pressure water pipe is disposed inside the section and the water is injected toward the screen dregs moving within the cylindrical crushing section.