JPH04131415A - Dust collector - Google Patents

Abstract

PURPOSE:To prevent foreign materials from flowing downward by fixing a guide plate at the rotary part of the rake in the lower end of the front screen and positioning the upper end of the rear screen in the downstream side of the front screen at the higher level than the allowable highest position of the motion. CONSTITUTION:A front screen 2 is installed in a water way 1 and a rear screen 3 is installed in the downstream of the front screen 2 in parallel with it and further, the upper end of the rear screen is positioned at a little higher level than the allowable highest position of its moving. Next, a rake 5 is arranged to be driven along the front and rear screen 2, 3 to move down in the back side with an endless chain 6. And a flat guide plate 4 made of a pipe or U-shaped pate is fixed at the rotary part of the rake in the lower end of the front screen 2. In this way, the foreign materials in the front and rear screens 2, 3 are prevented from clogging therein to operate smoothly and prevent a short circuit of water stream and hence, the foreign materials are prevented from flowing downward.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rear-drop type dust remover that prevents clogging of the screen picker between the front screen and the rear screen.

[Conventional technology]

Dust removers are used in sewage treatment plants and the like to remove impurities from inflowing sewage. This dust remover captures screen residue with a screen installed to block the flow of water in a waterway, and uses a rake that runs along the screen to rake it up and remove it.

Therefore, since an opening through which the rake passes is provided between the lower end of the screen and the bottom of the water channel at the bottom of the screen, there is a drawback that the screen residue flows down from this opening.

To prevent this, as disclosed in Japanese Utility Model Application Laid-Open No. 62-5063, an auxiliary screen is installed below the screen and downstream of the screen.

[Problem to be solved by the invention]

In a dust remover consisting of a front screen and a rear screen installed downstream of the lower part of the front screen, the rake rotation part between the front and rear screens engages with the rake, so sand, etc. that settles at the bottom of the screen can be removed. The rake is easily twisted, the resistance is large, a large load is placed on the rake, and sometimes the rake may be damaged.

The present invention aims to reduce the rake rotation load as much as possible in the rake rotation portion between the front and rear screens.

[Means to solve the problem]

The present invention has been made to achieve the above-mentioned object, and the gist of the present invention is that a flat guide plate, which is a vibrator or a flat plate bent into a U-shape, is fixed to the rake rotation part at the lower end of the front screen in a rear descent type dust remover. shall be.

[For production]

At the lower end of the front screen, a flat guide plate is installed at the rake turning point between the front and rear screens, so there is no clogging of foreign matter between the front and rear screens, and the rake does not get twisted, allowing smooth operation. It is something.

〔Example〕

The dust remover of the present invention will be explained below based on the illustrated embodiments.

In the figure, 1 is a settling tank in a sewage treatment plant, and a front screen (bar screen) 2 is installed to block the waterway of this settling tank 1. At the bottom of this front screen 2, there is a rake rotation between the bottom of the waterway and the bottom of the waterway. A necessary opening is provided, and a rear screen 3 is disposed downstream of the front screen 1. The total length of the rear screen 3 is determined so that it protrudes slightly above the water surface even at the maximum permissible water level at which dust removal is normally performed, but the rear screen 3 is lower than the front screen 2. The front and rear screens 2 and 3 are arranged parallel to each other, and the distance between them is appropriately determined so that the rake that circulates along the front screen 2 in a descending manner can engage with both screens 2 and 3, respectively.

A guide plate 4 is integrally provided at the lower part of the front screen 2 for smooth rake rotation and engagement. This guide plate 4 can be made by cutting a pipe plate of the required diameter to match the width of the front screen as shown in Fig. 1, disposing it in the width direction of the front screen and welding it together, or as shown in Fig. 3. The flat plate is curved into a U-shape of the required arc type, and this end is welded and fixed to the lower end of the front screen. Therefore, regardless of whether it is pipe-shaped or flat plate-shaped, the guide plate 4 should be plate-shaped at least at the rake turning section so that it does not mesh with the rake, and the guide plate 4 of the bracket and the lower end of the filtration screen should be placed at the bottom of the waterway. The shape of the front screen protrudes slightly toward the upstream side along the front screen prevents foreign matter from flowing down from between the front and rear screens to the downstream side of the screen at the lower open portion of the front screen.

Reference numeral 5 denotes a rake which is operated along the screens 2 and 3 in a backward descending manner, which is arranged at predetermined intervals on an endless chino 6, and is driven by this chino to operate the rake.

Further, in the embodiment shown in FIGS. 2 and 3, the intermediate screen 7
This intermediate screen 7 is arranged parallel to the front screen 2 and the rear screen 3, but its total length is equal to or shorter than the rear screen 3, and its upper end is arranged with a rake. The shape is designed to smoothly guide the meshing with 5. In this way, the intermediate screen 7 is arranged between the front and rear screens, and the rake pitch is determined so that when the rake is operated, one of the rakes is always arranged between the guide plate and the upper end of the intermediate screen. The tobacco rake acts as a shielding plate to prevent short circuits in the water flow.

Further, both the front and rear screens 2.3 and the intermediate screen 7 are all bar screens, and the rake 5 also has its both ends meshed with these screens, and the guide plate is not meshed with] is the water channel, and 2 is the front screen. , 3 is good.

1, 4 is a guide plate, 5 is a rake, and 7 is an intermediate screen [Effects of the invention] The dust remover of the present invention is a back descending type dust remover, and a pipe or a flat U-shaped plate is installed at the rake rotation part at the lower end of the front screen. Since the guide plate is fixed, there is no clogging of drainer at the rake turning section, and the rear descending type rake can turn smoothly. In addition, the upper end of the rear screen installed on the downstream side of the front screen was positioned slightly above the maximum allowable water level for operation, and an intermediate screen was placed between the front and rear screens, and one of the rakes was placed in front of this screen.・
Since it is placed between intermediate screens to prevent water flow from short-circuiting, it has the advantage of reliably preventing scum from flowing down.

[Brief explanation of drawings]

The drawings show one embodiment of the dust remover of the present invention, and Fig. 1 is a schematic illustration of the entire structure of the dust remover of the present invention, Fig. 2 is an enlarged view of the main parts, and Fig. 3 is an enlarged view of the main parts.
The figures show different embodiments, and FIG. 4 is a sectional view taken along the line A--A in FIG. 2. Lean. - and

Claims (3)

[Claims] (1) A rear descending type dust remover, characterized in that a flat guide plate made of a pipe or a flat plate bent into a U-shape is fixed to the rake turning section at the lower end of the front screen. (2) In a rear descending type dust remover, a flat guide plate is fixed to the rake rotation part at the lower end of the front screen, and the upper end of the rear screen installed downstream of the front screen is positioned slightly above the maximum allowable water level for operation. A dust remover characterized by preventing a short circuit of water flow. (3) In a rear descent type dust remover, a flat guide plate is fixed to the rake turning part at the lower end of the front screen, a rear screen is arranged behind the front screen, and an intermediate screen is arranged between the front and rear screens. At the same time, the rake pitch is determined so that one of the rakes is interposed between the front screen and the intermediate screen to prevent short circuits of water flow.