JPS6119768Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for scraping off scum generated at the corners of square tanks such as cleaning tanks, concentration tanks, and settling tanks in sewage and wastewater treatment facilities.

Such square tanks are often installed inside buildings to prevent odors, have a larger capacity than circular tanks, and are very advantageous in terms of construction, so they have become popular in recent years. However, with a rotary raking machine, it is impossible to scrape the corners of a square tank, and especially in sewage treatment, where the formation of scum is significant and the corner area occupies a large area,
Currently, we are having a very difficult time dealing with scum.

An object of the present invention is to provide a scraping device having a structure capable of scraping off scum at the corners of a square tank.

According to the present invention, the raking device is used in square tanks such as washing tanks, thickening tanks, and sedimentation tanks in sewage and wastewater treatment facilities, and has a rake for scraping the bottom of the square tank. In a raking device that includes a radial rake frame that rotates to draw an inscribed circle at a scum butt full plate having a top edge slightly protruding from the liquid surface around the entire circumference, a scum skimmer mounted on the rake frame via a first parallelogram link mechanism, and the scum skimmer. a guide roller device that is attached to one end of the scum skimmer and that is able to securely engage with and run along the top edge of the scum butt full plate; and a portion of the scum skimmer that is close to the guide roller device. A scum scraper device is installed in parallel with it via a second parallelogram link mechanism and is positioned at a height that allows it to scrape the liquid level in the rectangular tank. The second plate is biased towards the scum butt full plate.
A raking device is provided that includes means for applying force to a link mechanism.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

With reference to Figures 1, 2 and 3, right angle corner 1
A rake frame 4 in the radial direction rotates in a square tank 2 having a radius so as to draw an inscribed circle 3. This rake frame 4 is connected to a rotation mechanism (not shown) disposed at the center of the square tank, and is adapted to rotate at a level slightly distant from the bottom 5 of the square tank 2. A rake 6 extending in the longitudinal direction is attached to the bottom surface of the rake frame 4, and is used to scrape up sediment accumulated on the bottom 5 of the square tank.

Upright from the rake frame 4 is a scum skimmer support frame 7 extending substantially perpendicular thereto. A scum skimmer frame 8 is attached to the top of the support frame 7 so as to be slightly oblique to the longitudinal axis of the rake frame 4. At both ends of this scum skimmer frame 8, a pair of arms 11 and 12 are provided at 9 and 10.
are pivotally connected, and the opposite ends 13, 14 of these arms 11, 12 are spaced apart from each other at the same spacing as at the scum skimmer frame 8.
It is pivoted to. This scum skimmer 16 is a rod-shaped member, and a web or blade 17 is attached to the lower surface of the scum skimmer 16. Arm ends 13 and 14 are attached to this blade 17 via bearings 18 and 19. As is clear, the scum skimmer frame 8, the pair of arms 11 and 12, and the scum skimmer 16 constitute a parallelogram link mechanism, and the scum skimmer 16 moves while maintaining a parallel state with the frame 8. be able to.

As can be seen in FIGS. 1 and 3, a scum buttful plate 20 is provided along the entire circumference of the top edge of the square tank 1 and separated therefrom, and this scum butt full plate 20 is located at the corner of the square tank 2. 1, and has a top edge that slightly protrudes from the liquid level 21 in the square tank 2 over its entire circumference (see Fig. 5).

At one or outer end of the scum skimmer 16 is mounted a scum scraper device 22 having a scraper shaft 23 flanged concentrically to the scum skimmer 16 . A pair of arm supports 24 and 25 are fixed to this scraper shaft 23 at intervals along this longitudinal axis, and these arm supports 24 and 25
have scraper arms 26 and 27, respectively.
is pivoted. Scraper arm 26, 27
The opposite end of the wiper member 28 is pivotally connected to the wiper member 28 at the same spacing. As best seen in FIG. 5, the wiper member 28 is located at a level where it can scrape up the scum on the liquid surface 21 in the square tank 2. It will be clear that the scraper shaft 23, arms 26, 27, and wiper member 28 constitute a parallelogram linkage.

A guide roller device 30 is attached to the tip of the scraper shaft 23, and includes two guide rollers 31 that engage with the upper edge of the scum butt full plate 20 so as to sandwich it therebetween. When the rake frame 4 rotates, these guide rollers 31 run along the top edge of the scum buttful plate 20 without coming off it.

A guide member 32 is swingably attached to the opposite end, that is, the inner end, of the scraper shaft 23 via a mounting member 33, and the curved surface 34 of this guide member 32 slides on the inner end of the wiper member 28. It is designed to be engaged freely. An upright spring mounting member 36 is fixed to the guide member 32, and a coiled tension spring 3 is disposed between the spring mounting member 36 and a spring support 37 fixed to the scraper shaft 23.
8 is installed. This tension spring 38 always pulls the guide member 32 in the direction of the hour hand as seen in FIG. It is pressing against. Note that a compression spring can be used instead of the tension spring 38, and the same effect can also be obtained by using a counterweight.

In this way, as the rake frame 4 rotates, the scum scraper device 22 follows the shape of the scum buttful plate 20, completely scrapes off the scum at the corner part 1 of the square tank 2, and scrapes the scum on a part of the buttful plate 20. Scrape it into the provided scum box 40. As shown in FIGS. 2 and 3, this scum box 40 is connected to the outside through a pipe 41, so that the scum that has entered the box can be carried out.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram illustrating the movement of a scum scraping device equipped with a scum scraping device according to the present invention, Fig. 2 is a plan view showing a parallelogram link mechanism connecting the scum skimmer to a rake frame, and Fig. 3 2 is a side view of FIG. 2, FIG. 4 is an enlarged plan view of the scum scraper device attached to the scum skimmer, and FIG. 5 is a side view of FIG. 4. 1... corner part, 2... square tank, 4... rake frame, 8... scum skimmer frame, 11,
12...Arm, 16...Scum skimmer, 22
... Scum scraper device, 23 ... Scraper shaft, 26, 27 ... Arm, 28 ... Wiper member, 30 ... Guide roller device, 32 ... Guide member.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A raking device used in square tanks such as cleaning tanks, concentration tanks, and sedimentation tanks in sewage and wastewater treatment facilities, which has a rake for raking the bottom of the square tank; A raking device that includes a radial rake frame that rotates in an inscribed circle within a square tank, and is provided along the entire circumference of the top edge of the square tank and is spaced apart therefrom, and is provided at a corner of the square tank. a scum butt full plate that forms an arc at the bottom and has a top edge slightly protruding from the liquid surface around the entire circumference; a scum skimmer that is mounted on the rake frame via a first parallelogram link mechanism; , a guide roller device attached to one end of the scum skimmer and adapted to securely engage with and run along the top edge of the scum buttful plate; and the guide roller device of the scum skimmer. A scum scraper device is installed in parallel with the roller device via a second parallelogram link mechanism, and is located at a height that can scrape the liquid surface of the square tank. A raking device comprising means for applying a force to the second link mechanism so as to be biased towards the scum butt full plate parallel to the scum skimmer portion. 2 Utility Model Registration The raking device according to claim 1, wherein the scum skimmer is a rod-shaped member arranged parallel to the rake frame. 3 Utility Model Registration The raking device according to claim 1, wherein the means for applying the force is a spring disposed between the scum skimmer and the second link mechanism. . 4 Utility Model Registration In the scraping device according to claim 1, the means for applying the force is the second
A scraping device characterized in that it is a counterweight that applies a load to a link mechanism in a direction to move the scum scraper device toward the scum butt full plate.