JPH08257307A - Sludge scraping device - Google Patents

Abstract

PURPOSE: To certainly perform the changeover operation of a scraper prior to the driving of a carrier even if a sludge scraping device is reduced in weight and simplified by providing a first cam to a of drive arm and changing over the driving of the scraper by the second cam responding to the first cam. CONSTITUTION: A sludge scraping device is equipped with a base frame-shaped carrier 1 and front and rear bearings 15, 16 are attached to the carrier 11 and a drive arm 17 is supported in a freely rotatable manner by the front bearing 15 while a cooperation arm 18 is supported in a freely rotatable manner by the rear bearing 16. The long side part of the drive arm 17 is turned obliquely upwardly at a time of scraping and turned obliquely downwardly at a time of non-scraping and the short side part thereof becomes right-angled to the long side part. A slot-shaped first cam 29 is formed to the short side part of the drive arm 17 and engaged with the pin-shaped second cam 30 fitted with a roller provided to the leading end of the cooperation arm 18. Since a scraper is changed over and driven by doubling the force from a drive device, the changeover operation of the scraper 36 is certainly performed precedingly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple sludge scraping device for scraping and removing sludge accumulated on the bottom surface of a first settling tank or a final settling tank.

[0002]

2. Description of the Related Art In a first or final settling pond, a large amount of settling material accumulates on the bottom surface of the pond, so that a sludge attracting device is constructed to scrape and remove these sludges. The sludge scraping device is provided with a carrier that can reciprocate, and a blade-shaped scraper is attached to the carrier so that the sludge scraping device is vertical when scraping and horizontal when returning. This scraper is generally configured to be switched before driving the carrier.

[0003]

By the way, since the sludge attracting device up to now has a large size and is heavy, the scraper is operated first and then the switching is driven. When the weight of the carrier and other devices are simplified, the carrier may be driven first and the scraper may not be switched. In order to eliminate this, the present applicant has previously proposed a device in which the scraper operates reliably. But,
The certainty of such operation has become even more necessary nowadays when the simplification of the device is required. The present invention has been made to solve the above problems, and an object of the present invention is to provide a sludge attracting device capable of more reliably operating the carrier ahead even if the device is lightweight and simplified.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 is capable of traveling back and forth in parallel with a bottom surface of sludge, and a sludge attached to the carrier. A scraper that can switch between a scraping posture that allows one-sided scraping and a return posture that can avoid passing over sludge and pass over the sludge, a switching mechanism that switches the scraper, and a driving mechanism for the switching mechanism. And a drive device having a transmission member for reciprocating the carrier, wherein the switching mechanism includes a first cam provided on a drive arm rotatably supported by the carrier and the scraper. A second cam that is provided on the side and that switches and drives the scraper in response to the first cam. According to a second aspect of the invention, in the first aspect, one of the first and second cams is a shaft type, and the other cam is a groove type. According to a third aspect of the present invention, in the first aspect, the first cam is a roller type, while the second cam is a groove type into which the first cam is movably fitted. According to a fourth aspect of the present invention, in the first aspect, the approaching posture is a substantially vertical posture, and the returning posture is a substantially horizontal posture in which the tip is raised in the returning direction. According to the invention of claim 5, in claim 1, a guide rail is provided on the bottom surface, and the guide rail is plural. According to the invention of claim 6, in claim 1, a guide rail is provided on the bottom surface, and the guide rail is a single track. According to a seventh aspect of the present invention, in the first aspect, the first cam is a shaft type and the second cam is a groove type,
These cams are configured to be orthogonal to each other at least when the scraper is in the scraping posture. Claim 8
In the invention described in claim 7, in the second cam, a groove for locking the first cam is added to a groove end of the second cam. According to a ninth aspect of the present invention, in the first aspect, the support shaft of the drive arm and the support shaft of the scraper are arranged in a front-rear relationship. According to a tenth aspect of the present invention, in the first aspect, the support shaft of the drive arm and the support shaft of the scraper are arranged in a vertical relationship.

[0005]

A switching mechanism includes a first cam provided on a drive arm rotatably supported by a carrier and a second cam provided on the scraper side and switchingly driving the scraper in response to the first cam. Since it is possible to double the force from the drive device and drive the scraper switching, the scraper switching operation is surely ahead of the carrier driving, and the device can be operated by using the cam. The structure of is more simplified.

[0006]

The present invention will be described in detail below with reference to the illustrated embodiments. 1 to 4 show an embodiment, and FIG.
Is an overall longitudinal sectional view of a sludge basin equipped with the sludge attracting device according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side view showing details of the sludge attracting device, and FIG. 4 is a front view thereof. Show.

As shown in FIG. 2, the sedimentation pond is provided with left and right side walls 1, and end walls 2 shown in FIG.
And a straightening wall 3, which has a rectangular shape when viewed from above. Then, as shown in FIG. 1, a pit 5 is formed at one end of the bottom wall 4 for sludge to flow down and be pumped up.

A water surface 6 is set above the pond, and an overflow weir 7 is arranged along the side wall 1 so as to correspond to the water surface 6, so that the scum can be swallowed. An upper pit 8 is formed above the sedimentation pond. In such a sedimentation pond, as shown in FIG. 2, one unit has two paths on the left and right, and a large number of these units are arranged.

In each sedimentation basin, a guide rail 9 is fixed on the bottom wall 4 so as to pass through the center of each system passage to form a single track type. As shown in the cross section in FIG. 4, the guide rail 9 is fixed to the pit 5 from the end wall 2 side shown in FIG.

The sludge attracting device comprises an underframe-shaped carrier 11 as shown in FIGS. 3 and 4. Same carrier 11
Has a pair of front and rear main rollers 12 that roll on the guide rails 9, an upper side roller 13 that advances by hitting a flange edge, and a lower side roller 14 that advances by hitting a web and also functions as a retainer. Carrier 1
1, a front bearing 15 is provided on the left side of FIG.
Rear bearings 16 are attached to the right side, and an L-shaped drive arm 17 is rotatably supported on the front bearing 15 and an interlocking arm 18 is rotatably supported on the rear bearing 16.

The drive arm 17 is formed of a long side portion and a short side portion. The long side portion, which was slanted forward and upward at the time of scratching, oscillates about 90 degrees at the time of non-sweeping and becomes obliquely backward. . The short side portion is perpendicular to the long side portion, and the one that was diagonally upward and rearward at the time of scratching is rotated 90 degrees downward. An upper stop piece 20 and a lower stop piece 21 are attached to the upper ends of the long sides of the drive arm 17, and as shown in FIG. 2, an end is provided between the upper stop pieces 20 of the sludge attracting device equipped on the 2nd path. Wire rope (transmission means) 23 through two sheaves 22 fixed to the wall 2.
Are connected by

A pair of drums 25 are installed on the pond in accordance with each system path, and one of them is equipped with a drive source 26.
As shown in, the wire rope 23 from the drum 25
Are fastened to the lower stopper 21 via the sheave 22. As shown in FIG. 2, the other drum 25 is connected to a lower stopper piece 21 of a device that travels on another path via a sheave 22. A sprocket and a chain 27 interlock between the two drums 25.

On the other hand, on the short side of the drive arm 17,
A long hole-shaped first cam 29 is formed, and a pin-shaped second cam 30 with a roller provided at the tip of the interlocking arm 18 is rotatably engaged. Both the first and second cams 29, 30 form a switching mechanism. Both center lines of the short side portion and the interlocking arm 18 form an angle of less than 90 at the time of scratching, and the same angle at the time of non-claw.

Another main bearing 32 is provided on each side of the rear bearing 16.
Are arranged, and a horizontally long scraper support shaft 33 is rotatably attached to these. The support shaft 33 has
The mounting plate 34 is fixed to the left and right sides separately, and a scraper 36 is provided on the mounting plate 34 via a pair of left and right back plates 35. This scraper 36 is provided in a pair on the left and right,
They act in the same direction at the same time. In addition, scraper 3
Behind 6 there is a pair of guide rollers 3
7 are arranged.

This sludge attracting device operates as follows.
The state shown by the solid line in FIGS. 1 to 4 is the scratched state (posture), and as shown in FIG.
Is pulled by the wire rope 23 that is wound around the drum 25 by the drive of the
7 is slanted forward in the scraping direction, and the interlocking arm 18 is lifted up, whereby the scraper 36 is lowered to become a vertical surface, and the stopper 38 advances in the X direction while maintaining the same vertical state. . In this case, the second cam 30 is locked in the tip of the first cam 29.

As shown in FIG. 2, since the drive arm 17 is pulled in the opposite direction by the wire rope 23 in the sludge attracting device on the adjacent other system path, the scraper 36 is raised and is in the returning posture. When the sludge scraping apparatus of FIG. 1 advances in the X direction and reaches the top of the pit 5, the sludge scraped by the scraper 36 flows down into the pit 5. After that, the drive source 26 is rotated in the reverse direction, and the other drum 25 is interlocked with the chain from the drum 25 via the chain 27 to be in the return posture. This return posture is controlled so that the wire rope 23 is pulled in the direction of the imaginary line arrow Y in FIG. That is, when the wire rope 23 is pulled in the Y direction, the drive arm 17 rotates about 90 degrees in the same direction and enters the state shown by the phantom line in FIG. As a result, the first cam 29 rolls the second cam 30 to rotate the interlocking arm 18 downward, and the scraper 36 is lifted to a substantially horizontal state.

In this case, in the switching mechanism, as shown in FIG. 3, the pulling force of the wire rope 23 acts on the tip of the long drive arm 17, and the large rotation moment is used as a short arm for both the first and second cams. Since it is smoothly converted by 29 and 30, a large rotational force is generated in the scraper 36, the scraper 36 operates first, and then the carrier 11
Are driven for traveling.

As shown in phantom lines in FIG. 1, when the sludge attracting device returns to the vicinity of the end wall 2, the drive source 26 rotates in the reverse direction and the other wire rope 23 is pulled in the X direction, and the sludge attracting device is different from the above. By performing the reverse operation, the scraper 36 is in the vertical scraping posture.

On the carrier 11, FIG. 3 and FIG.
1, a pantograph 41 that can move up and down along the guide column 40 is attached, and the pantograph 41 includes a scum draw plate 42 at the upper end, which allows the scum floating on the water surface 6 in FIG. 1 to move in one direction. Scrape. This scraping is performed while the sludge scraping device is in the returning posture, but in order to avoid hitting the upper pit 8, the scraping is performed in front of the pit 8. Therefore, when changing from the approaching posture to the returning posture, the conversion lever 43 is stopped by a stopper (not shown).
Is kicked and rotated by the force of the weight 44 in the clockwise direction in the figure. Along with this, the kick-up lever 45 provided coaxially kicks up the protrusion 46 of the pantograph 41, so that the pantograph 41 is extended upward. The stoppage at this time is performed by the stopper 47.

In this state, the scraping plate 42 scrapes the scum, but when approaching the upper pit 8, a locking projection (not shown) hits the conversion lever 43, and the lever 43 is tilted in the scraping direction. As a result, the kick-up lever 45 moves down, and the pantograph 41 also descends to proceed in the return direction without hitting the pit 8 and be moved in the scraping direction. This scum attracting device may be a lifting mechanism other than the pantograph 41. On the other hand, the scum scraping device may not be configured as the sludge scraping device. Incidentally, the sludge attracting device may be configured so that the wire rope can be reciprocally driven by disposing drive sources respectively in the longitudinal direction of the pond. Also,
The guide rail is a single track type, but the single track type also includes one in which a plurality of adjacent rails constitutes a guide rail of one unit. Further, in the first and second cams 29 and 30, for example, the first cam 29 may have an axial shape and the second cam 30 may have a groove shape. Furthermore, the drive arm 17
At the upper end of the, a piece with a through hole is provided, through which the wire rope 23 can normally pass, but in case of an emergency such as a failure, the piece 39 provided on the separately driven wire rope 23 hits the piece. By pulling the entire device in the direction of the arrow Y, the device can be lifted above the pond. In this case, the wire rope 23 for driving is loosened and the wire rope 23 for emergency is lifted on other tracks in normal times.

The embodiment shown in FIGS. 5 and 6 is a sludge attracting device whose drive source is an underwater motor 50. A single track type guide rail 9 is laid on the bottom wall 4 of the pond, and the guide rail 9 is made of an H-shaped steel having a lateral groove.
The carrier 52 is reciprocally driven so that the main roller 51 rolls along the left and right grooves. An underwater motor 50 with a speed reducer is mounted on the carrier 52, and a drive sprocket 53 is provided on one side of the motor 50. On the guide rail 9, a chain 55, one of which is pulled by a tension mechanism 54 and the other of which is fixed, is stretched in parallel and hung between them. Note that other linear material of the chain, such as a wire rope or a belt (including a timing belt), may be used.

Chain 55 to drive sprocket 53
Goes through a pair of front and rear idlers 56. As shown in FIG. 5, the submersible motor 50 has a power distribution cord 57 connected to it with Ikegami. A long scraper support shaft 58 and a short machine shaft 59 are both rotatably provided in front of and behind the carrier 52, and a scraper 61 is attached to the support shaft 58.
Is attached, the front link 62 extends upward, and the rear link 63 also extends from the machine shaft 59. The scraper 61 extends from the scraper support shaft 58 diagonally rearward and extremely low, and has a semi-cylindrical rear end portion having a drain hole 64 formed on the upper surface thereof as shown in FIG. A guide roller 65 is arranged behind 61. The lower limit of the scraper 61 is defined by the stopper 66.

The front and rear links 62, 63 are connected by an interlocking link 67, and a weight 68 is provided at the rear part. Further, from the scraper support shaft 58,
A pair of left and right levers 70 each having a cam roller 69 project at the tip, and a contact plate 71 is provided so as to face the scraping direction of the cam roller 69, while a roller 65 of the scraper 61 is guided while hitting. Thus, a swash plate cam 72 is provided at the other end.

The submersible motor 50 is rotationally driven in the reverse direction,
The drive in the forward direction brings the device into the closed state shown by the solid lines in FIGS. In the closed state, the drive sprocket 53
The rotation of the carrier causes the carrier 52 to travel along the specified chain 55. At this time, the links 62 and 63 are urged to rotate clockwise by the weight 68 in FIG.
1 is also urged in the same direction and advances while being scraped along the bottom wall 4 by the guide roller 65 and the stopper 66. The rear end of the scraper 61 may be arranged further rearward as shown by a virtual line in FIG.

As the sludge is discharged from the scraper 61 by advancing the device and corresponding to the pit 5, the cam roller 69 immediately hits the contact plate 71, whereby the links 62 and 63 swing forward. With weight 68
Also moves forward. Since the lever 70 is stopped by the stopper 73, the scraper 61 also stops when the phantom line in FIG. 5 is lifted. When the submersible motor 50 starts to rotate in the reverse direction, the device starts returning to the end of the guide rail 9. Here, when the lifted guide roller 65 hits the swash plate cam 72, the guide roller 65 is guided downward, whereby the links 62 and 63 and the weight 68 move backward and the scraper 61 is lowered to the scratched state. The cam roller 69 at the front end also returns to the original forward direction and is in a scratching posture. It should be noted that the guide rail of the embodiment may be plural.

The embodiment of FIG. 7 shows a sludge attracting device which may constitute the guide rail 9 but is not particularly required. In the device, an explanation will be given in a state of being drawn by a solid line. A submersible motor 76 is mounted on a front portion of a carrier 75.
6 drives the front drive sprocket 77 in the forward and reverse directions. Then, the driven sprocket 79 at the rear portion is rotated via the left and right crawlers 78. In these things,
Around the rear shaft 80, a semi-cylindrical scraper 81 is provided on both left and right sides so as to be rotatable back and forth.
A weight 82 that swings back and forth is attached to the outer periphery of the shaft, and is stopped by a stopper (not shown) at a fixed forward and backward angle.

A stay 83 is erected from the rear end of the carrier 75, and a cam lever 84 which can swing back and forth is provided via the stay 83. The lever 84 has a roller 85 at the upper end, and the groove 86 at the lower end is
It engages with a cam shaft 87 provided on the inner side surface of 1. The scraper 81 may have a hole formed in the cylindrical portion to serve as a drainage port. Further, the weight 82 is the scraper 8
It can be omitted by weighting 1 itself.

In the scraper 81, in the scraped state, the weight 82 is positioned slightly behind the rear shaft 80 and is urged clockwise as shown by the solid line, so that the scraper 81 easily escapes when sludge is scraped. On the other hand, it runs a little for sludge that has become stuck. The movement of the cam lever 84 can be regulated to a constant value by a spring-loaded ball or the like. When the apparatus advances, the roller 85 hits the front contact plate 88 and escapes clockwise. As a result, the cam shaft 87 is kicked forward and the scraper 81 is rotated counterclockwise. At this time, the weight 82 comes to the front of the rear shaft 80 and stops at the stopper, so that it comes above the sludge. The apparatus returns in this state, but at the return end, the protruding roller 85 hits the rear contact plate 89, so that the scraper 81 rotates clockwise and is in a scratched state. The weight 82 may be replaced with a pull spring. In the embodiment, the device may be moved back and forth along the guide rail. In this case, there may be a plurality of guide rails.

8 and 9, a carrier 90 is provided with a submersible motor 91, and front and rear rollers 92 are interlocked with a sprocket 93 and a chain 94 so that they can travel freely on a guide rail 95 made of I-shaped steel. Scraper 96
An embodiment is shown in which it is arranged to be vertical when scratched and horizontally when returned. It should be noted that, as shown by the phantom line, the sprocket 93 may be arranged between the two divided rollers 92.

FIG. 10 shows a pair of right and left paired rollers 98 which can be freely rolled on a guide rail 97 made of chevron steel and can be run by an underwater motor 99.

[0031]

Since the present invention is configured as described above, it is possible to provide a sludge attracting device which can more reliably obtain the operation at the carrier front even if the device is lightweight and simple.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a sludge attracting device according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged side view of the sludge attracting device.

FIG. 4 is a vertical cross-sectional view from the front of FIG.

FIG. 5 is a side sectional view showing another embodiment.

FIG. 6 is a plan view of FIG.

FIG. 7 is a side sectional view showing another embodiment.

FIG. 8 is a vertical sectional view showing another embodiment as viewed from the front.

9 is a side view of the device of FIG. 8. FIG.

FIG. 10 is a vertical sectional view showing another embodiment as viewed from the front.

[Explanation of symbols]

4 ... bottom wall, 9 ... guide rail, 11 ... carrier, 17 ...
Drive arm, 23 ... Wire rope (transmitting means), 29
... first cam, 30 ... second cam, 36 ... scraper.

Claims (10)

[Claims] 1. A carrier capable of traveling back and forth in parallel with a bottom surface of sludge accumulating, a crawling posture attached to the carrier so that sludge can be clawed in one direction, and the sludge avoiding on the sludge. A scraper that can be switched to a return posture that can pass above, and a switching mechanism that switches the scraper,
In the sludge attracting device including a drive device that drives the switching mechanism and that reciprocates the carrier, the switching mechanism is provided on a drive arm rotatably supported by the carrier. A sludge attracting device comprising one cam and a second cam which is provided on the scraper side and which switches and drives the scraper in response to the first cam. 2. The sludge attracting device according to claim 1, wherein either the first cam or the second cam is a shaft type and the other cam is a groove type. 3. The sludge attracting device according to claim 1, wherein the first cam is a roller type, while the second cam is a groove type into which the first cam is movably fitted. 4. The sludge scraping device according to claim 1, wherein the scraping posture is a substantially vertical posture, and the returning posture is a substantially horizontal posture in which the tip is raised in the returning direction. 5. The sludge attracting device according to claim 1, wherein a guide rail is provided on the bottom surface, and the guide rail includes a plurality of guide rails. 6. The sludge attracting device according to claim 1, wherein a guide rail is provided on the bottom surface, and the guide rail is a single track. 7. The first cam according to claim 1, wherein the first cam is a shaft type, and the second cam is a groove type, and these cams are configured to be in an orthogonal state at least when the scraper is in a scraping posture. Sludge attracting device. 8. The sludge attracting device according to claim 7, wherein the second cam is provided with a recess for locking the first cam at a groove end. 9. The sludge attracting device according to claim 1, wherein the support shaft of the drive arm and the support shaft of the scraper are arranged in a front-rear relationship. 10. The sludge attracting device according to claim 1, wherein the support shaft of the drive arm and the support shaft of the scraper are arranged in a vertical relationship.