JPS60147284A - Scum scrape-off apparatus in separation tank - Google Patents

Abstract

PURPOSE:To enhance scum scrape-off capacity per one rotation of a disc, by providing a stopper, which inhibits a bottom plate from moving so as to go over each end part of a scrape-up plate in the circumferential direction, to the disc or the scrape-up plate. CONSTITUTION:Each bottom plate 12 is freely swigable not only in such a range that the free end 12' thereof is contacted with projections 14a, 14b provided to both end parts of each scrape-up plate 11 but also in the rotary direction of a disc 7 and received by the projection 14a provided to the end part, which is directed to the rotary direction, of the scrape-up plate 11 corresponding to the rotary direction of said disc 7 to enter a scum layer. Further, said bottom plate is pushed by scraped-up scum to be moved to the rotary direction opposite to that of the scrape-up plate 11 integrally rotated along with the disc 7 and received by the projection 14b provided to the opposite side end part to issue from the scum layer while scraping up scum. Subsequently, from a time when the disc 7 has been rotated almost half, scraped-up scum is poured in a discharge cylinder 6 and discharged in a discharge trough 3 provided along the side wall of a separation tank by a screw conveyor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scum removal device for scraping and depositing scum that has floated and separated on the liquid surface of a separation tank in a wastewater facility, etc., and discharging the scum to the outside of the tank.

A scum removing device is known, for example, from Japanese Utility Model Publication No. 311-3119Aθ. This is a single-wheeled vehicle that rides on rails laid on both sides of the separation tank, and is mounted on a running trolley that crosses the separation tank and moves back and forth along the rails. A supporting plate consisting of a swinging plate or a large-diameter disk that supports the discharge pipe in a direction across the circumference thereof, and has a disk on the inside and an arcuate portion with a slightly larger diameter than the disk on the outside. It is attached so that it can rotate completely, and a plurality of packets for scraping the scum in the tank are placed at intervals in the circumferential direction between the peripheral parts of the inner disc, and the outer rocking plate or large A guide plate with a flat plate part that protrudes shallowly below the water surface is installed between the peripheral edges of the diameter disk, and while the traveling truck is moving forward, the inner plate and screw conveyor inside are fully rotated, and the disk is rotated. In the Yoshipacket, the scum is introduced one after another into the interior on the flat plate part of the guide plate, and the scum that has been inserted is poured into the discharge tube from above, and the scum that has entered the discharge tube is transferred to the screw conveyor. It is discharged outside the tank. However, the scum can only be removed when the trolley moves forward; when moving back, the outer support plate must be rotated and the guide plate placed above the water surface, making the work difficult. ineffective.

For this reason, a device that could scrape off scum when a traveling trolley moved in either direction was developed in 1988.
-/koysqo '1 Aug -/2gbtts publication. This device uses a packet that can manipulate the scum by rotating in either forward or reverse direction, and the scum can be manipulated by switching the direction of rotation of the packet when moving forward or backward. do. However, a cylinder is rotatably fitted around the outer periphery of the discharge tube, and multiple blade plates are fixed radially around the outer circumference of this cylinder, and between the disks rotatably attached to each end of the discharge tube. The same number of arcuate plates as the blades are installed at equal intervals in the circumferential direction, and either the cylinder with the blades attached or the disk with the arcuate plates installed is driven to rotate in the forward and reverse directions. The structure is very complicated because the outer end of the wing plate and one circumferential end of the arcuate plate are engaged with each other depending on the direction of rotation to form a packet. In addition, holes are made in the circumferential surface of the cylinder to which the vanes are attached, spanning the entire length of the cylinder in the axial direction at each interval between the vanes, and the scum that the packet has inserted is poured into the discharge tube through the holes. Therefore, if a large number of vanes are installed radially, the strength of the cylinder will be insufficient, so the number of vanes is limited to three at most.This reduces the number of packets and reduces the amount of scum generated per rotation of the disc. There is a problem that the scraping ability is low. Therefore, the present invention provides a plurality of fixed operation plates that are spaced apart from each other in the circumferential direction between the disks, and also provides It is movably installed between two bottom plate metal discs that move along the inner surface of each operation plate depending on the direction of rotation of the plate, and the pair of operation plate and bottom plate rotates the disk in either the forward or reverse direction. The above-mentioned problems were solved by constructing a packet that could be used to manipulate scum.

Hereinafter, the misfire 8A will be explained with reference to the illustrated embodiment.

/ is a separation tank, and on both side walls /α and lα are railco,
A discharge gutter 3 is provided along the square of the side wall to receive the removed scum. DA is a traveling trolley that rides on the above-mentioned rails L' and R' with wheels L' and R', traverses the entire separation tank, and reciprocates over the separation tank guided by the rails. is installed across the separation tank. The discharge @6 has an opening Aa on its upper surface, and is provided with a discharge port 6b at one end for discharging the scum that has entered the cylinder and is transferred by the screw conveyor into the discharge gutter 3.

Reference numerals 7 and 8 denote an inner disk and an outer support plate rotatably provided on the outer periphery of each end of the discharge tube 6.

Inner disc? , 7 are provided with packets q at appropriate intervals in the circumferential direction, allowing the scum of the test force to be inserted into the inside no matter which direction the disk rotates.

Further, between the outer support plates g and 8, a shallow V-shaped guide plate 10 having flat plate portions 10α and 10b on the front and rear sides is provided. A sprocket is attached to one side of the carriage and the support plate 8, so that the rotation of the motors provided on the traveling carriage is transmitted by an endless chino. Note that the motor that fully drives the screw conveyor only needs to rotate the screw conveyor in one predetermined direction, but the motor that fully rotates the disc 7 and the support plate s can be rotated in either the forward or reverse direction. things and,
If not, attach a rotation direction switching device.

When removing scum by moving the traveling truck all the way forward, use the support plate 8.
and rotate the flat plate part 10α in front of the guide plate 10 to the packet 9.
The scum is parked horizontally just below the position where it will be operated, and the disc 7 is rotated in the direction of the arrow α. In this way, the traveling cart reaches one end of the separation tank, and when it is next moved back, the support plate 8 is rotated fully, and this time, the flat plate portion lθbf packet behind the guide plate is directly below the position where the scum is inserted. While keeping it horizontal, the disk 7 is rotated only in the direction opposite to the arrow α.

Now, each bucket) 9 has a large number of fixed operation plates installed at intervals in the circumferential direction between the peripheral parts of the disk 7. Each of the embodiments shown in FIGS. 1 to 3 has the same number of movable bottom plates as the operating plates, which can be moved along the inner surface of the operating plates by rotation of the disc. The end of the bottom plate facing away from the operation plate is pivotally attached to, for example, a shaft 13 provided between the disks, so that it can swing freely between the opposing surfaces of the disks. The operation plate // has a cross-sectional shape of a circular arc with a curvature centered on the axis /3, and at each end in the circumferential direction there is a protrusion or stopper / that comes into contact with the free end 1.2' of the bottom plate. Fα and
It has l b.

With this, each bottom plate /, 2 has a free end 7. 2' is each operation plate /
It is swingable within the range where it comes into contact with the protrusions na and /llb at both ends of /, and the protrusion /da cL (or nb ) and enters the scum layer, and when it enters the scum layer, it is pushed by the scum and the operation plate rotates in the opposite direction of the rotation of the operation plate, which rotates together with the n1 disk. It moves along the inner surface and is received by the protrusion /1lb (or /dacL) on the opposite end, and then rotates together with the insertion plate again to input the scum and exit from the scum layer. The scum that has been operated and thrown out is poured into the discharge tube from the time when it has made half a rotation, and the t1 screw conveyor S discharges the scum into the discharge gutter 3 along the side wall of the separation tank. This operation is the same when the traveling truck is moved forward and the entire disk 7 is rotated in the direction of the arrow a, and when the traveling truck is moved backward and the disk 7 is rotated in the opposite direction indicated by the arrow.

Then, as the disc 7 rotates, the bottom plate 12 pours the scum into the discharge tube and when it passes the top dead center, it pivots in the direction where it is received by the protrusion/da α on the rotation direction side due to its own weight. Since the remaining scum is forcibly poured into the discharge tube, the time required to empty the scum into the discharge tube is shortened.

Incidentally, the protrusions/da α, nb may be provided on opposite sides of the disk 7.7, but if they are provided along the entire length at each end of the operation plate, the scum that is inserted inside the It also serves to prevent water from leaking between the free end of the bottom plate and the end of the operating plate.

The packet of the embodiment shown in FIG.
Instead of being pivotally mounted on the shaft /3, it is possible to move in an arc concentric with the entire disc between the discs and the discs facing each other within the range where they contact the stoppers /Uα and /llb. For this purpose, for example, arc-shaped rails 1S are provided protruding from the center of the discs 7 and 7, and recesses that engage with the rails are provided on both sides of the bottom plate. Further, the cross-sectional shape of the operation plate is an arc concentric with the disk. ,,,.

Also in the embodiment of the chair n, an auxiliary plate is placed inside each operation plate // so as not to obstruct the movement of the bottom plate and close to the end opposite to the end of the bottom plate facing the operation plate. /Af disk plate 7, the scum scraping capacity of each packet can be increased. In addition, in the embodiment shown in FIG. 4, if the cross-sectional shape of the auxiliary plate/B is made into an arc shape concentric with the disk 7 as shown in the figure, the operation plate/l and the auxiliary plate/&
It is also possible to support each end of the bottom plate /, 2 and guide the bottom plate to move in an arc.

In this way, according to the present invention, between the peripheral parts of the opposing disks,
Equipped with a bottom plate that moves under its own weight according to the direction of rotation of the disc, it is possible to provide a large number of packets that can handle scum regardless of whether the disc rotates forward or backward, and the scum removal ability of one rotation of the disc is improved. It has the advantage of being able to provide large equipment.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an embodiment of the present invention, Fig. 2 is a longitudinal sectional side view of the same essential parts during forward movement, Fig. 3 is a longitudinal sectional side view of the same main parts during backward movement, and Fig. 4 The figure is a vertical side view similar to FIG. 2 of the main parts of another embodiment, and in the figure, l is a separation tank, da is a traveling truck, 6 is a discharge tube, ri is a disc, 9 is a packet, / 1 is an operation plate, /ko is a bottom plate, /daa, /dab are stoppers.

Claims (1)

[Scope of Claims] A discharge tube with an open top is supported in a direction across the separation tank on a traveling cart that reciprocates above the separation tank, and a rotating disk is attached to each end of the outer circumference of the discharge tube. In a scum removal device using a separating tank, the above packets are installed in a fixed bucket (buckets) installed around the periphery of the disks, and the buckets are installed across the disks at intervals in the circumferential direction. An operating plate and a bottom plate that is movable along the inner surface of each operating plate depending on the direction of rotation of the disc, and the disc or the operating plate has a bottom plate that is attached to the operating plate. A device for removing scum from Japanese cypress wood, characterized in that it is provided with a stopper to prevent the scum from moving beyond each end 7 in the circumferential direction.