JPS6057362B2 - Sludge scraping device for rectangular settling tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a sludge scraper that rotates around a support stand provided in the center of a rectangular settling tank.

Conventional sludge scrapers installed in rectangular settling tanks have a problem with raking up sludge from the four corners of the settling tank, and as a device to deal with this problem, a moving arm is provided at the tip of the fixed arm of the rotating sludge scraper. By installing a guide roller at the tip of the moving arm and moving it along a guide plate arranged on the inner wall circumferential surface of the rectangular sedimentation basin, the four corners of the settling basin are The sludge was causing damage to the center.

1 and 2 show a conventional sludge scraper in a rectangular settling tank, in which a sludge scraper 2 is disposed in the center of a rectangular settling tank 1, and a fixed arm 3 of the sludge scraper 2 is A guide roller 4 rotatably mounted on a shaft at the tip and rotatable at the tip.
The guide roller 4 is brought into contact with a guide plate 6 which is annularly fixed to the inner wall side of the rectangular sedimentation basin.

A wire 7 is attached to the other end of the moving arm 5, and the gravity of the weight 9 is applied through the wire sheaves 8, 8', 8'', and the guide roller 4 is pulled by the wire 7 so that it always comes into contact with the guide plate 6. Furthermore, scraping plates 10 and 10' are attached to the fixed arm 3 and the movable arm 5, respectively, so that the settled sludge in the settling tank is scraped up from the side wall of the settling tank to the sludge pit in the center of the settling tank. The guide roller 4 of the movable arm 5 comes into contact with the guide plate 6 due to the gravity of the weight 9 acting on the wire 7, but since wires, wire sheaves, etc. are used, there are many rotating parts, making the device complicated and its operation difficult. It is unstable and uncertain, and it is difficult to attach the guide plate to the sedimentation basin of a civil engineering structure with the same degree of precision as when installing a machine. Also, when the sludge scraper is operating, the guide roller does not move away from the guide plate. The sludge scraping machine of the present invention has disadvantages such as the guide roller moving unsmoothly or sometimes coming apart, and the scraping plate of the moving arm not working reliably. This problem is solved by providing a sub-arm that is rotatably attached to the tip of the fixed arm, and linking the fixed arm and the sub-arm with a transmission device, so that the sludge in the four corners of the rectangular settling tank can be removed by the sub-arm. The purpose of the present invention is to provide a sludge scraping machine that scrapes sludge.

An embodiment of the present invention will be described based on the drawings.

11 is a sludge scraper, and its center box 12
is installed so as to support a center support 13 protruding from the center of the bottom of the rectangular sedimentation tank, and is rotatably supported by the center support 13.

The lower part of the center box 12 is provided with a pair of fixed arms 14 extending radially on both sides, and a vertical sub-arm shaft 16 to which a sub-arm 15 is fixed is rotatably mounted at the lower end of the fixed arms 14. A horizontal transmission shaft 18 supported by bearings 17 and 17'' is attached to the fixed arm 14, and a fixed bevel gear fixed to a fixed center support 13 is attached to the inner end of the transmission shaft 18. A drive bevel gear 20 that meshes with
The center box 12 is rotated by a drive device 23 attached to the top of the center box 12, and the fixed arm 14 and the sub-arm 15 are rotated by a driving device 23 attached to the top of the center box 12. At the same time, the drive bevel gear 20 that meshes with the fixed bevel gear 19 of the center support base 13, that is, the transmission shaft 18, is rotated, and the transmission bevel gear 22 at the outer end of the transmission shaft 18 causes the sub-arm shaft 16 to be driven. By rotating the bevel gear 21, the sub-arm shaft 16 and the sub-arm 15 are rotated. Therefore, when rotating the center box 12 in the clockwise direction,
The fixed arms 14 both rotate in the same direction, and the sub-arms 15
moves circularly in the same direction as the fixed arm 14, and the sub-arm 15 itself rotates counterclockwise about the sub-arm shaft 16. However, center box 12
That is, the number of teeth of the bevel gear is set so that when the fixed arm 14 rotates 114 times, the sub-arm 15 rotates 114 times,
For example, if the fixed bevel gear 19 and the drive bevel gear 20 have the same number of teeth, and the transmission bevel gear 22 of the transmission shaft 18 and the driven bevel gear 21 of the sub-arm shaft 16 have the same number of teeth, and thus the fixed arm 14 is rotated, As shown in FIG. 6, the locus of the position of the sub-arm 15 with respect to the sedimentation basin forms a substantially square shape with corner portions connected by circular arcs. The figure shows the position of the sub-arm 15 every 1116 rotations when the fixed arm 14 rotates once, and
Every 14 rotations, the sub-arm 15 becomes parallel to the side surface of the adjacent sedimentation basin, and in the middle thereof, the tip of the sub-arm 15 rotates so as to approach the four corners of the rectangular sedimentation basin. Sho 2
4, 2C, 241 are scraping plates provided on the lower surface of the fixed arm 14, 25 is the inner wall of the sedimentation basin, 26 is the bottom of the sedimentation basin, 2
7 is a sludge bit provided at the center of the bottom 26. Next, the operation of the sludge scraper for a rectangular settling tank according to the present invention will be explained.

The inner wall 25 of the rectangular sedimentation tank has a substantially square shape, and all four corners are formed by arcs that are substantially the same or parallel to the locus drawn by the tip of the sub-arm 15. In Fig. 6, when the fixed arm 14 is positioned as shown in this figure, the sub-arm 1
5 is positioned parallel to the inside and the fixed arm 14 is rotated clockwise, the sub-arm 15 moves together with the fixed arm 14 sequentially from position [1] to [■] [■] [■] [V]... It also rotates in a counterclockwise direction about the sub-arm shaft 16. Therefore, as the tip A of the sub-arm 15 rotates, it acts to push out the sludge in the vicinity toward the sludge bit 27 in the center of the settling tank, and at the same time, as the tip A moves, it pushes out the sludge on the rear side. It acts to pull the sludge close to the inner wall 25 of the settling tank toward the inside of the settling tank. Note that the tip A at position [■] [V] acts to push the sludge toward the inner wall 25 of the settling tank, but from this, the sludge moves left and right along the inner wall 25, and then is scraped toward the sludge bit 27. Move so that you can be easily approached. Also, the tip B of the sub-arm 15 is located at the position [1] [■] [■
]・・・・・・・・・As the inner wall of the sedimentation basin 2
5 to disturb and move the sludge near the inner wall. Therefore, the scraping plates 24, 2C, 24'' of the fixed arm 14
As the fixed arm 14 rotates, the sludge is collected onto the sludge bit 27 in the center of the settling tank, and the sub arm 15
The sludge near the inner wall of the sedimentation tank moves due to the rotation of the sedimentation basin, and the sludge is collected in sequence. Therefore, by providing the fixed arm 14 with the rotating sub-arm 15, it is possible to completely collect the sludge from the four corners of the settling tank without any blind spots. The sludge scraper for a rectangular sedimentation tank according to the present invention has a rotating sub-arm attached to the tip of a rotating fixed arm, and uses a scraping plate provided on the fixed arm to scrape up the sludge bits at the bottom of the rectangular sedimentation tank and form a rectangular Since the sludge from the four corners of the settling tank is scraped to the center by the scraping plate attached to the sub-arm, the sludge from the entire bottom of the rectangular settling tank can be scraped up smoothly without blind spots.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional sludge scraper, Fig. 2 is a side view of the same, Fig. 3 is a plan view showing an embodiment of the present invention, Fig. 4 is a partial side view of the same, and Fig. 5 is a plan view of the conventional sludge scraper. FIG. 4 is a plan view, and FIG. 6 is an explanatory view showing the locus of the sub-arm relative to the settling tank. 11...Sludge scraper, 14...Fixed arm, 15...Sub arm, 16...
Sub-arm shaft, 18...Transmission shaft, 19...
・Fixed bevel gear, 20... Drive bevel gear, 21...
... Driven bevel gear, 22 ... Transmission bevel gear, 23
... Drive device, 24, 2C, 24''... Scraping board.

Claims (1)

[Claims] 1. In a sludge scraping device consisting of a scraper that rotates a fixed arm having a scraping plate around a support provided at the center of the main body of a rectangular settling tank, a scraping plate with a scraping plate protruding from the tip of the fixed arm is provided. A sludge scraping device for a rectangular settling tank, characterized in that a sub-arm is rotatably provided, and a rotating device of the fixed arm and a rotating device of the sub-arm are linked by a transmission device.