JPS645930B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention is applicable to sewage treatment plants. It is installed in sand basins at relay pumping stations, agricultural waterways, or intake channels at power plants, and is used to remove dust from flowing water.It can be tilted and raised and lowered using a pivot as a fulcrum, especially in the upper part of the water. This invention relates to an improvement in a rake reciprocating drive type dust remover in which a rake is provided at the lower end of a rake arm supported by the rake, and the sieve residue scraped up by the rake is dropped onto a collecting section.

Prior art A rake that tilts and moves up and down scrapes up the sieve residue that has landed on the bar screen.
A so-called rake reciprocating type dust remover that drops the sieve residue on the rake onto the collecting section when it reaches the sieve residue drop-off point in the upper part of the water is known, for example, from Japanese Patent Application No. 14513-1983.
No. (Special Publication No. 1982-29612) or Utility Application No. 55-174506
As seen in Utility Model No. 57-43948, etc., the applicant had already proposed this prior to filing this application, but according to such conventional devices, after scraping the sieve residue with a rake, A wiper is used to drop the sieve residue at the drop point above the water. However, such wipers are installed so that as the rake rises, the wiper toe slides against the rake surface from the front to the tip, so soft mud and sand can be removed. Small debris can be brushed off normally, but if you scrape up something like a relatively large and hard lump of stone, the wiper toe may touch the top of the lump and cause the wiper to press idly. This caused a problem in that the rake could not be pushed down reliably from the top surface of the rake, and the wiper method became unsuitable for removing dust from sieve sludge treated in urban sewers.

In addition, in this type of dust remover and other dust removers, pressure washing water is sprayed to release the sieve residue scraped up by the rake from the rake surface and fall to the collecting section, or the rake shelf surface is Mechanisms for tilting or reversing the dust have been implemented, but the washing water injection type has problems with the difficulty of processing the washing water and high cost, and in the case of dust removers with a reversing rake, the rake does not easily turn over underwater. It has the disadvantage that it requires functions such as guides, etc., and furthermore, when operating the rake with a hydraulic cylinder or hoisting rope, additional power is required, and the structure is complicated and costs are high. .

Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to eliminate the wiper, which was conventionally considered indispensable in rake reciprocating dust removers, making it possible to adopt a rake reversal method, and other The purpose of this is to reverse the rake only at the sieve residue drop-off point in the upper part of the water, so that it is safe and prevents accidental reversal or malfunction in the underwater part. The object of the present invention is to provide a device that can reliably scrape up sieve residue. Another purpose is to create an excellent dust remover that has the advantage of simplifying the mechanism by eliminating the need for a conventional rope pulling device using a hydraulic cylinder or hoisting machine to reverse the rake, and having the advantage of low cost. The point is to provide the following.

Means for Solving the Problems In order to achieve the above object, in the rake reversing device of the present invention, the rake that scrapes up the sieve sludge that has washed up on the front surface of the bar screen in the waterway is tilted and rotated about a pivot in the upper part of the water. In a rake reciprocating dust remover, the rake 2 is installed at the lowest end of a rake arm that is supported to move up and down, and is configured to scrape up the sieve residue from the water to the upper part of the water and drop it onto the collection section. , an L-shaped rake arm 2a with a rake receiver 3 protruding from its lower end, and a rake receiver 3.
At the same time, the rake shelf board 2b is constructed of a rake shelf board 2b which is supported in an up-and-down manner so that the rear end of the rake can be lifted up and down using a rotating shaft 4 as a fulcrum. It is configured to be inverted and erected by being engaged with a provided guide cam 15, and the rotating support shaft 4 of the rake shelf board 2b is moved from the center to the tip side so that the center of gravity of the rake shelf board is at the rear. It is something that has been established.

A bracket is provided on the rake shelf plate and projects downward from the rotating support shaft, and a guide rail corresponding to the guide cam is provided on the bracket.

Example Examples will be described below.

The dust removers to which this invention is applied include a rack type dust remover, a telescopic boom type or a multi-stage cylinder type dust remover, and the present embodiment shows the rack type dust remover. In FIG. 1, reference numeral 1 denotes a bar screen installed perpendicular to the waterway, and a rake 2 (to be described later) scrapes up the sieve residue that has washed up on the front surface of the bar screen, and carries it to the upper part of the water while draining the water.

The rake 2 has an L-shaped rake arm portion 2a with a rake receiver 3 protruding from its lower end, and is supported almost horizontally on the rake receiver 3 so as to be able to freely rotate about a rotational support shaft 4 as a fulcrum. and a rake shelf board 2b.

A bracket 11 is provided with a rotating support shaft 4 on the lower surface of the rake shelf board 2b at a position as close as possible to the rake claw 2b' side, and this support shaft 4 is provided to protrude above the rake receiver 3.
Attach to. Further, this rake shelf plate 2b is provided with a pushing arm 12 projecting downward, and a trochanter 13 is attached to the lower end of the pushing arm 12.

This trochanter 13 moves without contact at a predetermined interval when the rake 2 engages with the bar screen 1 and rises, and when it touches the apron 14 on the upper end extension of the bar screen 1 and rises. However, when it reaches a specific position at the upper end of the apron 14, it engages with the guide cam 15 set at that part and receives a relative pushing action. As shown in the figure, it gradually stands up in an inclined manner.

The rake arm 2a is attached to an elevating body 6 that moves up and down along the guide frame 5.

The guide frame 5 is installed on a frame 7 or a movable trolley framed above the water, and the middle part is pivoted to a bracket 8 with a pivot 9 so that the guide frame 5 can be tilted freely, and the upper end is pulled by a tilting cylinder 10 when necessary. The rake 2 is configured to be separated from the bar screen 1 by tilting the pivot shaft 9 as a fulcrum. At the front end of the rake shelf board 2b (on the opposite side of the rake claw 2b') there is a balance weight 16 and a cover 17 that prevents debris that is barely caught on the rake from falling between the rake 2 and the rake receiver 3 when the rake is turned over. and.

The elevating body 6 is pulled up and down by a chain 20 hooked on chain wheels 18 and 19 provided at the upper and lower ends of the guide frame 5, and moves up and down.The elevating movement of the elevating body 6 causes the pinions 2 of the racks 21 and 22 to engage with each other.
3 rotates to move the rake arm portion 2a up and down. 24 is a motor for raising and lowering it. The rake arm portion 2a can be raised and lowered by a telescopic boom or a multi-stage cylinder, in addition to the above-mentioned simple method.

Operation When the rake 2 descends into the water, it is moved forward and away from the bar screen 1 by the action of the tilting cylinder 10, and when it reaches the lower limit position, it engages the bar screen 1 and continues to move the elevating body 6. Along with the upward movement, the rake 2 rises in the water and scrapes up the sieve residue that has landed on the front of the bar screen 1 to the upper part of the water. The rake 2 rises from the upper end of the bar screen 1 along the apron 14, and as it rises further,
A rake shelf plate 2b is attached to the lower end 15a of the guide cam 15.
The trochanter 13 provided at the end of the pushing arm 12 abuts against it. Then, the rake shelf board 2b rotates from the third to
In Figure 4, the guide cam 15 is rotated clockwise (arrow A), and the slope of the guide cam 15 continues as it rises, so by the time it reaches the upper end 15b of the guide cam, it is greatly tilted and the sieve residue on the rake shelf 2b is It slides onto the chute 25 at the top of the apron.

As soon as it reaches the upper end 15b of the guide cam 15, the rake stops rising, and one cycle of dust removal work is completed.

Effects of the Invention As described above, the present invention includes a rake 2 for scraping up sieve residue, an L-shaped rake arm portion 2a having a rake receiver 3 protruding from its lower end, and a rotating support shaft 4 on the rake receiver 3. A rake shelf board 2b is supported on a fulcrum so that the rear end of the rake can be lifted up and down, and the rake shelf board 2b is connected to a guide cam 15 provided at the upper part of the water at the sieve residue dropping point in the upper part of the water. Rake shelf board 2
Since the rotating shaft 4 of b is set at a position displaced from the center to the tip side so that the center of gravity of the rake shelf is at the rear, the rake 2 can scrape up the sieve residue that has flowed onto the front of the bar screen to the upper part of the water bar. When reaching the collection section from the top of the screen through the apron, the rake shelf automatically turns over around the supporting shaft under the action of the guide cam above the water, and the sieve residue on the rake shelf is smoothly and reliably lifted under its own weight. The rake shelf can be slid down from the water and does not require a wiper as in the past, which simplifies the mechanism and is extremely cost-effective.Also, in underwater areas, the center of gravity of the rake shelf is located at the rear. Because of this, it always remains horizontal except at the drop point, and there is no need to worry about accidentally flipping or malfunctioning underwater, and there is no need to install a guide for attitude control such as a rake guide in the underwater area. Practical effects can also be expected, such as the overall simplicity and cost reduction.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the entire dust remover, Fig. 2 is an enlarged plan view of the rake section, and Figs. 3 and 4 show the operating state of the rake. It is an enlarged side view. 1... Bar screen, 2... Rake, 3...
Rake receiver, 4... Rotating support shaft, 5... Guide frame, 6... Elevating body, 12... Pushing arm, 13...
Trochanter, 14... Apron, 15... Guide cam,
2a...Rake arm section, 2b...Rake shelf board.

Claims (1)

[Scope of Claims] 1. A rake for scraping up sieve residue that has washed up on the front surface of a bar screen in a waterway is provided at the lowest end of a rake arm that is supported in the upper part of the water so that it can tilt and move up and down using a pivot as a fulcrum. In a rake reciprocating drive dust remover that scrapes up sieve sludge into the upper part of the water and drops it onto the collection section, the rake 2 that scrapes up sieve sludge is
An L-shaped rake arm 2a with a rake receiver 3 protruding from its lower end, and a rotating support shaft 4 on the rake receiver 3.
and a rake shelf plate 2b supported so that the rear end of the rake can be lifted up and down with the rake as a fulcrum.
The rake shelf board 2b is configured to be inverted and erected by engaging a guide cam 15 provided at the upper part of the water at the sieve residue drop-off point in the upper part of the water, and the rotation support shaft 4 of the rake shelf board 2b is connected to the guide cam 15 provided at the upper part of the water. A rake reversing device for a rake reciprocating drive type dust remover, characterized in that the rake reversing device is provided at a position displaced from the center to the tip side so that the center of gravity is at the rear. 2. The rake reversing device of the rake reciprocating drive type dust remover according to claim 1, wherein a balance weight 16 is provided at the rear end of the rake shelf plate 2b.