JPS6240643Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for preventing outflow of sludge in a sludge quantitative feeder.

The amount of screen sludge collected from sewage treatment plants by dust removers is not necessarily a constant amount; sometimes it is very large, and sometimes it is extremely small, so the amount collected is uncertain. be. In this state, if the water is directly supplied to the next processing equipment, such as a dehydrator, using a conveyor or the like, if the water is temporarily supplied in excess of its dehydrating capacity, there is a risk that the dehydrator will be damaged or its operation will be stopped. In order to prevent this, the screen scraps collected from the dust remover are supplied to a hopper where they are temporarily stored via a conveyor or a transport means such as a dump truck, and a quantitative supply device installed in the hopper is used to feed the screen scraps into the next process. We are trying to supply it to This quantitative feeding device is generally equipped with a screen in the hopper supplied with water and a rake device for scraping up screen scum along the screen surface. In order to prevent this, a movable screen is provided at the bottom of the hopper so that it swings only when the rake passes.
However, if a large amount of residue is introduced, a large amount of residue may get on the movable screen, making it impossible to drive, or the movable screen may become tangled with residue.
There were drawbacks such as locking between the movable screen and the rake, and scum getting entangled in the bearing, making the movable screen inoperable.

In view of this, the present invention aims to prevent the outflow of residue by eliminating the movable screen and configuring the shape of the screen and hopper under specific conditions. do.

In the figure, 1 is a receiving hopper in which the residue collected by a dust remover, etc. is supplied by a conveyor or a dump truck, and a set capacity is stored. screen 2
The hopper 1 is shaped so that even if screen scum descends toward the bottom of the hopper, it will be surely scraped up by the screen and scraping device 5, and it will be collected from the top of the hopper. A drain port 4 is provided on the rear side of the screen so that water passes through the screen at the bottom and drains water.This water supply and drainage is carried out continuously, and the water level gradually decreases, allowing screen scum to be captured by the screen.

The screen 2 is installed in the screen scum storage tank part a of the receiving hopper to prevent screen scum from flowing out.
and the wastewater outflow tank part b are arranged in the hopper so as to be inclined upward from the bottom thereof.
(See FIG. 1) This screen 2 is constructed by arranging a large number of angle members 2a in parallel at predetermined intervals to form screen stitches, and fixing each angle member to a frame F. When the angle material 2a is fixed to the frame, it is shaped like an inverted triangle, that is, the corner of the bent part is on the bottom side, the upstream side has a predetermined screen width, and the downstream side is tapered more than the screen width. This is done to prevent clogging. At this time, it is desirable to make the screen as narrow as possible in order to prevent the screen residue from flowing out.

In addition, as shown in the figure, a parallel part 1a is formed in a part of the bottom of the receiving hopper 1 so that the screen is parallel to the lower end of the screen 2 for a certain length, and the distance between the hopper parallel part 1a and the screen 2 is set at a rake. 5a, and the length of the parallel part of the hopper parallel to the screen is made longer than the pitch between the rakes protruding from the endless chain of the rake device, that is, the rake mounting pitch. This ensures that no matter what operating conditions the rakes are in, one or more rakes are always present in the parallel portion of the hopper to prevent the slag from flowing out.

Since there is no movable screen according to the present invention, there are fewer breakdowns, smooth operation is possible, and the rake is always present in the parallel part of the hopper, so it is possible to reliably prevent the flow of residue. have

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view, FIG. 2 is an enlarged explanatory view of the main parts, and FIG. 3 is an explanatory view of the rake screen. 1...Hopper, 1a...Parallel part, 2...Screen, 2a...Angle material, 3...Water inlet, 4
...Drain port, 5...Rake device (rake), 5a...
…rake.

Claims (1)

[Scope of utility model registration request] In the residue quantitative feeder, the residue is fed into a hopper, and the residue is supplied in fixed quantities by a screen installed in the hopper and a rake device that operates along the screen while supplying and draining water to the hopper. , form the parallel part of the hopper so as to be parallel to the lower part of the screen, and maintain the required distance between the screen and the parallel part of the hopper for passing the rake, and set the length of the parallel part of the hopper to the screen. A sludge outflow prevention device in a sludge quantitative feeder which is larger than the pitch between rakes provided at a fixed pitch between the chains of a rake device operating along the same line.