JPH02203907A - Endless feed type screen apparatus - Google Patents

Abstract

PURPOSE:To always secure the collecting function of a screen by supporting screens in a freely revolvable manner by endless chains and arranging stoppers limiting the max. angle of inclination of the screens to the endless chains at the screen behind positions of the endless chains. CONSTITUTION:Endless chains 3, 3' are provided between mutually revolving sprockets 1, 2 arranged at a required interval under tension. A plurality of screens 4 fixed to frames 6 are provided to the endless chains at an appropriate interval so that the upper mount parts 7 of the frames 6 are supported in a freely revolvable manner by appropriate means such as shafts and stoppers 5 limiting the max. angle of inclination of the screens 4 are arranged on the endless chains at positions behind the screens. As a result, by continuously moving the screens in a drain trough, suspended matters of various sizes can be perfectly removed and clogging of the title device can also be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention mainly relates to a screen suitable for use as a pretreatment for wastewater treatment by an activated sludge method, etc., and particularly to an endless conveyance type screen device.

(Conventional technology) Currently, treatment of various wastes is attracting attention for environmental purification.
BACKGROUND ART Treatment measures for industrial waste, including the treatment of industrial wastewater, have become an important issue, and treatment by activated sludge method is one of them, and is widely adopted in various facilities.

By the way, when treating wastewater using the activated sludge method, etc., various types of screens are usually used as pre-treatment, but these conventionally used screens can be broadly classified into: (a) Drain fixed screen (II) Pump Up-type fixed screen (c) Vibrating screen (d) Drum-type screen. Of these, (b) fixed drain screen is a screen attached to the drain to remove floating matter, and is an improved type. Some have a scraping device as well.

In addition, the (TI) pump-up type fixed screen drain ditch uses a pump to suck up dirt along with suspended solids (SS), and uses a screen to remove them. Special screen wires are used, and the screen angle is set in multiple stages. The system automatically removes floating matter that has been sucked up by cleaning and prevents it from adhering to the screen.

Furthermore, the vibrating screen (c) sucks up floating matter along with dirty water on one side of the vibrating screen and purifies it by the vibration, and the vibration prevents floating matter from adhering to the screen.

Furthermore, the drum-type screen is a rotating cage-type screen that sucks floating matter together with waste water into the screen and purifies it, and the overall inclination angle and rotational force prevent the floating matter from adhering to the screen.

(Problems to be Solved by the Invention) However, each of the above-mentioned screens has the following problems when used.

In other words, although the fixed drainage ditch screen in (a) is suitable for removing large floating objects, it is not necessarily suitable for removing fine floating objects because it clogs significantly, but also because it is a fixed type screen. Difficulty in removing floating matter. This also applies to the case where there is a scraping device.

On the other hand, various improvements have been made to the pump-up fixed screen (El), the vibrating screen (C), and the drum-type screen (D), and the problem of screen clogging has now been almost completely resolved. However, since most of these use pumps, they are limited by the suction diameter of the pump, and floating objects larger than the diameter must be removed in advance.
Furthermore, when a large amount of wastewater flows into the drain, exceeding the suction capacity of the pump, overflow occurs frequently from the drain, resulting in a situation where a sufficient screen effect cannot be achieved.

Therefore, the drain fixed type screen is still the most common type of screen used today.

Therefore, the present invention addresses the above-mentioned facts and focuses particularly on the problems of fixed drain screens and attempts to improve them.
The purpose of this system is to completely remove everything from large floating objects to fine floating objects by continuously moving the screen within the drainage ditch, and to prevent clogging.

(Means for Solving the Problem) In order to achieve the above object, the present invention is characterized in that an endless chain is stretched between mutually rotating sprockets arranged at a predetermined distance. Then, a plurality of screens are fixed to a frame at appropriate intervals on the endless chain, and the upper part of the frame is rotatably supported by an appropriate means such as a pivot, and the screens move while touching the bottom of the drain etc. In addition, a stopper is provided at a position behind the screen of the endless chain to restrict the maximum inclination angle of the screen.

Here, the number of screens attached to the endless chain is selected at any time depending on each purpose.

In addition, the screens are compatible with each purpose and location, and in addition to wire mesh, various known filter media can be used, and the meshes of multiple screens are not the same, and various types can be used. .

Note that although this specification describes the case where an endless chain is stretched between opposing sprockets,
The word ``sprocket'' is not a sprocket or a chain in the strict sense of the term, but is used in a more formal sense to include the case where an endless belt is stretched between pulleys.

(Function) According to the screen device of the present invention configured as described above,
When the driving shaft of the sprocket is driven, the endless chain moves and, for example, in a drainage ditch, multiple screens move with their frames always in contact with the bottom of the drainage ditch, capturing floating waste from the drainage ditch one after another. When the screen is raised, the stopper restricts the maximum angle of inclination of the screen to prevent the collected floating objects from falling, and when moving on the return side, the screen is tilted backwards, allowing the screen to move forward while draining water.

When the falling position is reached, a tray is appropriately arranged on the falling side, and this tray collects floating objects that collide with the screen when it falls under its own weight. Move to.

At this time, since the screen is supported so that it can rotate freely, on the falling side, due to its own weight, it rotates around its support shaft or support pin faster than the speed of the endless chain, and the receiver collides with the plate. .

The floating matter collected by this collision falls onto the tray, and at the same time the screen is cleared from clogging.

(Embodiments) Hereinafter, specific embodiments of the apparatus of the present invention will be described further based on the accompanying drawings.

FIG. 1 is an overall view showing one example of the endless conveyance type screen device according to the present invention. (IL) An endless chain stretched between sprockets (11, (21), one of which is connected to a drive source to rotate the endless chain (3) around it; Screens (4) fixed to the frame are attached to the chain at appropriate intervals, and behind each screen (4) there is a stopper (5) that regulates the maximum backward tilt angle of the screen. is set up.

Figures 2 and 3 are detailed views that enlarge the main parts in Figure 1 and clarify the manner in which the screen (4) and stopper (5) are installed. 4) is made of a filter material such as a wire mesh, and is fixed to a frame (6), and the upper part of the frame (6) serves as a mounting part (7) having a through hole (8), and the opposing endless chain (3) ( 3)'
It is rotatably inserted and supported by a shaft θO) provided across mounting portions (9) and (9)' provided at required locations. Then, the screen (
On the rear side of the installation of 4), the above-mentioned bars (5) for regulating the maximum backward tilt angle of the screen are installed at corresponding positions of the endless chains (3) and (3)' which also face each other. .

Note that 0]) in Fig. 1 indicates that the container for floating matter is a plate.

Thus, when using the device configured as described above to purify wastewater in a drainage ditch, the endless chain (3)
, multiple screen frames (6) with the rotation of (3)'
is sequentially moved in the direction of the arrow in the drainage ditch from contacting the bottom of the ditch, and the floating objects in the drainage ditch are successively collected by a plurality of screens (4).

As the screen (5) moves, when it reaches the end on the collecting side, the screen (5) rises together with the frame (6) and gradually rotates downward due to its own weight. At this time, the stopper (5) located at the back prevents the tilting backward beyond a predetermined level, and as a result, the floating matter collected earlier is removed from the screen (4).
) to prevent it from falling.

Thereafter, the screen (4) further rotates toward the return side with the rotation of the endless chains (3) and (3)', and at this time, the screen (4) rotates backward as shown in Figure 3 and floats. While holding the object on the upper surface of the screen, the inclination angle is maintained by the stopper (5) and the object moves forward while draining water.

When the screen (4) reaches the falling side, its own weight causes the screen (4) to rotate as shown in FIG. 1, and the receiver collides with the plate 0υ, and the impact moves the floating object onto the plate αυ.

After that, repeating this action, the endless chain (3),
By the continuous rotation of (3)', floating matter is collected by the screen (4) one after another, and the purification process of the wastewater is completed continuously.

The above is a case in which the device of the present invention is applied to purifying the inside of a drain, but it can be used for other purposes by selecting the screen frame and structure of the screen.
Similarly, wastewater can be purified.

In addition, in the above embodiment description, the endless chain (3), (
3)' is stretched over sprockets (1) and (2), but a belt is used instead of a chain, and sprockets I and
As mentioned above, the same effect can be achieved even if a pulley or the like is used instead of.

(Effects of the Invention) As described above, the present invention attaches a plurality of screens to an endless chain, and as the chain rotates, the screens sequentially purify contaminated wastewater. By selecting the size and number of screens, and by changing the mesh size of the screens as appropriate, it is possible to collect and remove a wide range of floating objects, from large to fine. Since it collects water, it is possible to increase the treatment capacity regardless of the pump capacity as in the past, and it has the remarkable effect of significantly increasing wastewater treatment efficiency compared to conventional screens.

In addition, since the device of the present invention has a stopper behind the screen to restrict the maximum inclination angle, the collected floating objects will not fall even when ascending, and on the return side, the screen is under its own weight. tilts backwards to allow floating objects to fall, block them, and drain water, making it easier to separate floating objects from the screen afterwards,
Furthermore, the impact caused by the separation of suspended matter eliminates clogging of the screen, ensuring the screen's collection function at all times, and is highly praised for its practicality in preventing pollution as a screen device in waste treatment.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing one example of the screen device of the present invention, FIG. 2 is a partial perspective view showing details of the main part on the lower side in FIG. 1, and FIG. 3 is a main part on the return side in FIG. 1. It is a partial perspective view showing details. (1); (2)... sprocket, (3),
(3)'...Endless chain, (4)...Screen, (5)...Stopper (6)...Screen frame, (7)...Frame attachment part, (11)... The receiver is a plate.

Claims (1)

[Claims] 1. An endless chain is stretched between mutually rotating sprockets arranged at a required interval, and multiple screens are fixed to the frame at appropriate intervals on the endless chain, and the upper mounting part of the frame is attached to the shaft. What is claimed is: 1. An endless conveyance type screen device, characterized in that the screen is rotatably supported by suitable means, and a stopper for regulating the maximum inclination angle of the screen is disposed behind the screen on an endless chain.