JPS6310862Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for supplying water in the tank as washing water to a scum box installed in a sedimentation tank or a concentration tank.

Generally, in a sedimentation basin as shown in FIG. 1, scum is generated near the water surface, so a scum discharge device is provided for scraping up scum using a skimmer blade 2 suspended from a skimmer arm 1 and discharging it into a scum box 3. In the figure, 4 is a center well, 5 is a drive device, 6 is a rotating shaft, 7 is a scum discharge pipe, 8 is a rake arm, 9 is a rake, 10 is an outflow conduit, and 11 is a raw water inflow pipe.

However, in such a settling tank, if the scum concentration is high, scum may accumulate in the scum box or scum discharge pipe, causing problems such as clogging, and scum discharge is performed intermittently by a skimmer blade. Moreover, since the amount of scum collected is small, the above-mentioned troubles may occur even when the scum concentration is low.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional ones and provide a scum box water supply device for effectively carrying out scum discharge operations, which intermittently flushes water in the tank to the scum box. It is configured to be supplied as water.

That is, the present invention provides a water supply device for supplying wash water to a scum box for receiving and discharging scum scraped by a skimmer blade suspended from a skimmer arm movably disposed in a sedimentation basin or thickening tank. , comprising: a striker suspended from the skimmer arm; an opening provided in the side surface of the scum box at a depth below the scum retention layer; and an opening/closing mechanism for intermittently opening and closing the opening by the striker. The opening/closing mechanism includes a swinging arm having a gate, and a push-down mechanism that rotates the swinging arm in a predetermined direction when pushed down by the striker to move the gate that is in contact with the opening away from the opening. and, at other times, a biasing member for rotating the swinging arm in a direction opposite to the predetermined direction and bringing the gate into contact with the opening. It is a water supply device.

An embodiment of the present invention will be explained based on FIGS. 2 to 5. A scum box 22 is formed by combining rectangular plane plates and has a rectangular scum inlet 21. The scum inlet 21 is located at a position slightly higher than the water surface. The tank wall 2 is connected through the support 23 as shown in
4 is fixedly installed.

The side plate of the scum box 22 located at a depth below the scum retention layer is provided with a rectangular opening 25 having a width approximately equal to the width thereof, and the side plates of the scum box 22 that are opposite to each other and have the same shape are provided. A bracket 26 is provided, and an opening/closing mechanism 27 for intermittently opening and closing the opening 25 is pivotally attached to this bracket 26. As shown in FIG. 4, this opening/closing mechanism 27 includes a frame 29 provided with an insertion hole 28' for a pin 28 in the longitudinally intermediate portion, and rollers provided at one longitudinal end, the other end, and the intermediate portion of the frame 29, respectively. 30, an urging member such as a weight 31, and a swing arm 32, which is pivotally connected to the bracket 26 via the pin 28.

The opening 2 is provided at the tip of the swinging arm 32.
A gate 33 serving as a valve body for opening and closing the opening 25 is pivotally mounted, and the contact surface of the gate 33 with the opening 25 is formed by a rubber plate 34. Therefore, the opening/closing mechanism 27 as a whole is rotatable with respect to the bracket 28, and the gate 33 is rotatable with respect to the swing arm 32.

In FIG. 3, reference numeral 41 denotes a skimmer blade that is suspended and pivotally connected to a skimmer arm 51. A flexible plate such as a rubber plate 42 is provided at the lower end of the skimmer blade so as to run near the water surface, and the blade is in the direction of the arrow. Turn around.
In the figure, 61 is a striker suspended from the skimmer arm 51, and is formed by connecting in this order an inclined plate 62 with an upward slope in the direction of movement, a horizontal plate 63, and an inclined plate 64 with a downward slope in the direction of movement. It is boat-shaped, and its running trajectory is set so as to come into contact with the roller 30 and push it down.

The scum inlet 21 of the scum box 22 is provided with partition plates 35 and 36 facing each other, and inclined plates 37 and 38 facing the scum inlet 21 are provided, respectively. The inclined plate 37 has one end located at approximately the same height as the lower end of the rubber plate 42 and has an upward slope in the direction of movement of the skimmer blade 41.
5 and 36 to form a gutter-shaped scum discharge path, and the scum discharge path, the scum inlet 21, and the inclined plate 38 are arranged on the running track of the rubber plate 42.

Note that the rubber plate 42 has a width slightly smaller than the width of the inclined plate 37, and the partition plates 35 and 36 have a width slightly smaller than that of the inclined plate 37.
It is disposed substantially parallel to the traveling direction of No. 2 and vertically. In the figure, 71 is a buff full plate, 72 is a wear plate, 73 is a scum discharge pipe, and 74 is an anchor bolt.

Next, the operation of the above embodiment will be explained.

When the skimmer arm 51 is rotated, the skimmer blade 41 and striker 61 are also rotated in the direction of the arrow in FIG. 3. Rubber plate 42 of skimmer blade 41
The scum accumulated near the water surface is scraped up along the scum discharge path attached to the scum box 22 and discharged into the box. The striker 61 advances toward the roller 30, but when the striker 61 does not come into contact with the roller 30, the gate 33 closes the opening 25 by the weight 31, but when the inclined plate 62 of the striker 61 comes into contact with the roller 30, the gate 33 closes the opening 25. The roller 30 is gradually pushed down, the gate 33 moves away from the opening 25, and the water in the tank begins to flow into the scum box 22. While the roller 30 is in contact with the flat plate 63, the opening 25 is fully opened (the first 5). Further, when it comes into contact with the inclined plate 64, it gradually closes, and when the contact ends, it is fully closed by the weight 31.

In this way, the skimmer blade 41 discharges the scum to the scum box 22, and the striker 61 and the opening/closing mechanism 27 remove the scum from the scum box 22.
Washing water will be supplied to No. 2, but both operations may be performed almost in parallel.
Cleaning water may be supplied immediately after scum discharge. In the above embodiment, both the skimmer blade 41 and the striker 61 are attached to the skimmer arm 5.
1, but if it is installed directly or indirectly on the rotational drive shaft of the skimmer arm 51,
It may be arranged in any form. In addition, the supply flow rate and supply time of cleaning water are determined by Striker 61.
It can be easily adjusted by appropriately setting the installation height, the length in the direction of movement, and the size and depth of the opening 25. It is also effective to increase the width of the rubber plate 42, the scum box 22, etc. (in the direction perpendicular to the direction of movement of the skimmer blade 41), or to make the lower part of the scum box 22 conical.

As described above, the present invention provides an opening in the side surface of the scum box at a depth below the scum retention layer, and an opening/closing mechanism operated by a striker provided on the rotational drive shaft of the skimmer arm. The system is structured so that the water in the tank is intermittently supplied to the scum box as cleaning water by opening and closing the scum box.With this invention, the scum inside the scum box can be reliably removed and washed without the need for a special drive device. There is no fear that floating objects will get caught in the opening and impair its opening/closing operation, and there are practical benefits such as the scum discharge operation can be carried out extremely smoothly.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional circular sedimentation tank, Figures 2 to 5 show an embodiment of the present invention, Figure 2 is a cross-sectional view of the main part, and Figure 3 is a cross-sectional view taken along the line shown in Figure 2. 4 are perspective views of the opening/closing mechanism, and FIG. 5 is an explanatory diagram of the operation of the opening/closing mechanism. 22... Scum box, 25... Opening, 2
7... Opening/closing mechanism, 30... Roller, 31... Weight,
32... Swinging arm, 33... Gate, 41...
Skimmer blade, 51...Skimmer arm, 6
1...Striker.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. To supply cleaning water to a scum box that receives and discharges scum scraped by a skimmer blade suspended from a skimmer arm movably installed in a sedimentation basin or thickening tank. In the water supply device, a striker suspended from the skimmer arm, an opening provided in the side surface of the scum box at a depth below the scum retention layer, and an opening/closing mechanism for intermittently opening and closing the opening by the striker. The opening/closing mechanism includes a swinging arm having a gate, and when pushed down by the striker, rotates the swinging arm in a predetermined direction to move the gate in contact with the opening away from the opening. and a biasing member for rotating the swinging arm in a direction opposite to the predetermined direction and bringing the gate into contact with the opening at other times. A water supply system for scumboxes. 2. The opening/closing mechanism includes a frame provided with a pin at a longitudinally intermediate portion, the pressing member provided at one longitudinal end of the frame, and the biasing member provided at the other longitudinal end of the frame. and the swinging arm provided in the longitudinally intermediate portion of the frame, the swing arm being pivotally connected to the bracket attached to the scum box via the pin. The water supply device according to item 1. 3. The water supply device according to claim 2, wherein the push-down member is a roller rotated by contact with the striker, and the biasing member is a weight. 4. The utility model registered in claim 1, wherein the scum box has a rectangular scum inlet whose upper part is formed of a flat plate, and the opening is provided in the flat plate. water supply equipment. 5. The water supply device according to claim 4, wherein the flat plate is rectangular, and the opening is rectangular and has a width substantially the same as the width of the flat plate. 6. The water supply device according to claim 1, wherein the gate has a contact surface with the opening formed of a rubber plate. 7. The water supply device according to claim 1, wherein the gate is pivotally connected to the swing arm. 8. The striker is of a boat shape formed by connecting in this order an inclined plate with an upward slope in the direction of movement, a horizontal plate, and a slope plate with a downward slope in the direction of movement of the striker. water supply equipment.