JPS6335064Y2 - - Google Patents

Description

[Detailed explanation of the invention] In large-scale public sewage treatment plants, screen gates are installed in the channels that lead sewage to the sewage treatment facility to filter and remove trash from the sewage. Small factories, school facilities, etc. are now required to treat sewage, and as shown in Figure 1, it has become necessary to install an automatic screen machine 1 for sewage treatment in the sewage flow channel a.

The automatic screen machine 1 has side flow blocking plates 3 protruding from both sides of a machine frame 2 which is fitted into a flow path a having a relatively narrow groove width, and which is in contact with the revetment wall. They are arranged in a lattice pattern, and their short rear sides are tilted rearward and downward to form a dust removal screen 4 that serves as a sliding discharge part 6. Furthermore, a pair of endless belts are driven along the inner surface of the machine frame 2 on both sides. A bar-shaped cleaner 8 having a scraping piece 9 protruding from between each screen bar 5 in a comb-like shape is attached to 7, and an endless band 7 is installed over the front surface between the machine frames 2. It is interlocked and driven by a motor 11 installed on a board 10, and a trash basket 13 is freely replaced and installed at a position behind the trash screen 4 to receive the lower end of the sliding discharge part 6. The garbage basket 13 is located at a position where dripping water drops fall into the flow path a. A guide plate 12 is provided at the front of the lower end of the dust removal screen 4 to guide the wastewater flowing at the bottom of the flow path a to the height of the lower end of the screen 4.

The automatic screen machine 1 illustrated here operates as long as the water pump, sewage treatment equipment, etc. downstream of the machine are working properly and maintaining the water level W in the flow path a.
Although it is operating without any problems, it is originally intended for small-scale treatment of sewage, and if for some reason the water stops flowing downstream, or if a backflow occurs and the water level rises, it will accumulate in the garbage basket 13. Ivy debris overflows into the channel a and flows backwards, catching the screen 4 from behind and causing clogging. However, the cleaner 8 does not have the function of cleaning behind the screen, and even if it does, it cannot discharge the garbage out of the waterway, so not only does the wastewater overflow from the flowway, but also after an accident. The cleaning and maintenance of the automatic screening machine 1 is time-consuming, and the above-mentioned screening process has to be interrupted, and such accidents often occur.

The present invention aims to eliminate the above-mentioned drawbacks of the conventional automatic screen machine and protect the back of the dust screen 4.

An embodiment of the present invention is as follows.

A support rod 22 is passed to the exit 21 behind the machine frame 2, a stopper rod 23 is passed to the lower end, and the support rod 2
The shaft rod 25 inserted through the shaft support piece 24 provided behind the shaft 2
The dust backflow prevention safety screen bars 26 arranged in a lattice pattern are pivotally supported, and the lower ends of these bars 26 are stopped by the stopper rods 23 so that they cannot swing forward. There are also a number of safety screen bars 26
Rubber plates 27 are pasted on both sides and the upper side.

As exemplified above, in the present invention, the safety screen bars 26 are arranged in a lattice pattern behind the dust screening screen 4, and the upper end portions are pivotally supported to freely swing rearward. When there is a forward flow in the flow, the pressure of the sewage from which coarse garbage has been removed by the dust removal screen 4 causes the wastewater to swing backwards as shown in the figure, without obstructing the flow and removing the garbage. The garbage filtered by the removal screen 4 is carried by the cleaner 8 to the garbage basket 13 and stored therein, and by replacing the basket 13, the screen function can be performed without any trouble. In addition, even if an accident occurs in the downstream where water is blocked and the water level rises and garbage overflows from the garbage basket 13 into the flow path a while flowing backwards, the safety screen bar 26 protects the back of the garbage prevention screen 4 at that time. When the screen is closed, the garbage that tries to flow behind the screen 4 on the backflowing sewage is blocked by filtering action, and it works accurately even when the manager is absent.

As has been made clear through the above description, the present invention has the advantage of effectively eliminating the drawbacks of conventional automatic screen machines for sewage treatment.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, with FIG. 1 being a longitudinal sectional side view, FIG. 2 being a rear view, and FIG. 3 being a perspective view. 1... Automatic screen machine, 4... Dust removal screen, 5... Screen bar, 6... Discharge section, 8... Cleaner, 13... Garbage basket, 21... Exit, 26... Safety screen bar.

Claims (1)

[Scope of utility model registration request] The machine frame that is fitted into the flow path is equipped with a dust screening screen with grid-like screen bars arranged and a cleaning element that is driven by a motor to scrape up coarse dust that gets caught on the screen. In an automatic sewage treatment screen device, a wastewater basket is installed that drips water droplets into the wastewater basket, and the waste scraped up by a cleaning element is transferred to the wastewater basket. An automatic screen for sewage treatment, characterized in that safety screen bars for preventing the backflow of trash facing inside are arranged in a lattice pattern, and each upper end of the bars is pivotally supported to freely swing rearward.