JPS5926109A - Apparatus for scraping up precipitated sand - Google Patents

Abstract

PURPOSE:To keep load constant, by varying the position of a sprocket corresponding to the variation in the chain tension force of a scrape-up apparatus for taking out grit in the sand precipitation basin of a water treating process. CONSTITUTION:A drive sprocket 40 is rotated toward an arrow 54 by a motor 39 and a chain 50 is travelled to the same direction. Precipitated sand 57 accumulated on a scraping part 56 is scooped up by a basket 51. When the tension force of the chain part 50a between the drive sprocket 40 and a scrape-up sprocket 37 is increased, the scrape-up sprocket 37 is moved to a direction parted from the precipitated sand 57 around a support shaft 35 to be embedded in the percipitated sand and the basket receiving increased resistance is separated and removed from the precipitated grit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a raking system for removing sediment, etc., from a sand settling area provided at the front stage of a water treatment process, and in particular, the invention relates to a raking system for removing sediment, etc., from a sand settling area provided at the front stage of a water treatment process. The position of the lifting sprocket changes automatically, and it has a 1,1 adjustment function for self-load, and when the operation is stopped, the hl? This invention relates to a sand raking device that can raise a lifting sprocket to prevent it from being buried.

Packet conveyor type devices are often used as equipment for scraping up sand etc. deposited in sand settling areas, as they are inexpensive, have a reliable scraping function, and are less likely to break down. Since the lifting device uses packets attached to an endless chain to scoop up sand etc. that have settled at the bottom of the settling basin, as the amount of sand flowing in during operation increases, the raking resistance by the packets increases. There are problems such as packets being damaged or chains breaking due to increased load, and furthermore, if a large amount of sediment flows in due to heavy rain etc. while operation is stopped, the packets installed at the bottom of the pond will be buried together with the chain in the sediment. If the machine is restarted in this state, the machine may be damaged due to overload. In order to avoid this, it was necessary to remove sediment from the bottom of the pond and pull up some of the packets before restarting operation, which posed the problem of requiring a great deal of labor.

The sand settling and scraping device 7 shown in Fig. f31 and Fig. 2 is such a tt! In the former case, the swinging rod (3) attached to a fixed support shaft (2) in the sand settling area (1) has a sprocket (4) for sand removal at the tip.
), and is swingable by a hydraulic cylinder (5) connected to its rear end, and this raking sprocket (4)
A conveyor chain (11) with a large number of packets 0α attached to the submerged sprocket (6), and the above-water sprocket (71, (81, (91)) is passed 1vz, and rotates the driving sprocket (7). By running the chain circle in the direction of the arrow 0da, and running the packet attached to the chain along the bottom OJ of the sand settling basin, the sand 0Φ etc. deposited on the bottom surface is scraped up and transported upward. Then, during operation, when the amount of sediment flowing into the bottom of the settling basin (131 from the direction of arrow (1 [i)) increases,
Operate the hydraulic cylinder (5) to rotate the swinging rod (3) in the direction (3) indicated by the wavy line, and move the raking sprocket (4).
) is removed from the sediment to reduce the load between it and the sediment. When the lifting sprocket (4) is rotated upward in this way, the chain circle becomes slack, so the hydraulic cylinder (171) is activated to compensate for the slack, and the sprocket (8) is moved (as shown by the dashed line). Retract to position B1,
Scrape the chain to remove any slack.

In the latter case, the sprockets O and (19) whose positions are fixed are linked to the movable sprockets (2 and I23) which are connected by the sprockets α (to) and a (201 and (21)). When the link (241) is lifted by the drive device (25) via the wire (6), the link (20), (2
1), (24) and fixed sprockets (18), (1
9) By forming a four-node chain between links (2
4) is pulled up while maintaining the parallel thrust, and the height of the raking sprocket (■) can be adjusted arbitrarily.

However, in the former case, the hydraulic cylinder (5) and αη are used to change the height of the raking sprocket (4).
Furthermore, the hydraulic unit required to drive the hydraulic cylinder is expensive, and in the latter case, the link (
A hoisting device etc. (2) for pulling up J41 is required separately, and both of them are inevitably expensive devices. It does not have a self-load adjustment function that automatically raises and lowers the raking sprocket, and in order to perform such automatic adjustment, it is necessary to separately install a multi-lft automatic adjustment device, which is an even more expensive device. It has no choice but to become.

Therefore, the purpose of the present invention is to have a self-load adjustment function in which the raking sprocket automatically moves up and down to keep the load constant as the amount of sediment settles, and also to raise and lower the raking sprocket with a simple operation at the end of the work. An object of the present invention is to provide a simple and reliable sand raking device that can lift a sprocket to a safe area and prevent the raking sprocket from being buried by settling sand, and which prevents the sand phase that flows in during operation from increasing. When the raking resistance of the packets increases, the inflow side raking sprocket automatically rises and moves away from the bottom of the sand settling basin due to the increase in chain tension, reducing the raking resistance of the packets. At the same time, when the operation is stopped, the sprocket above the water that is rotating normally is braked to forcibly increase the chain tension, and the raking sprocket is raised to prevent the raking section from being buried in the inflowing sediment. Sand scraping device f which summarizes the points made as follows.
lkl-.

Next, embodiments embodying the present invention will be described in detail with reference to the accompanying drawings starting from FIG. Here, Figure IS 3 is a schematic side view of a sand settling and scraping device according to a first embodiment of the present invention, and Figure '54 is a schematic side view of a sand settling and scraping device according to a second embodiment of the present invention.

In Figure 3 showing the example of 9g1, 弼 is a settling basin formed in a waterway or independently in the form of a tank or a tank to deposit earth and sand, and is generally formed lower at the bottom of the basin. It has a sedimentary part (31), and the sediment contained in the water flowing in from the direction shown by the arrow (2) is distributed in such a way that it is more in the inlet part of the pillow part ta and less in the outflow part (goods). and is deposited in the deposition section (11). In the upper part of the sedimentation part c31), a support shaft (2) mounted on the side wall of the settling basin is rotatably provided, and a rocking shaft (2) that can freely swing around the support shaft (2) as a central fulcrum is provided. It has a rod f3G+, and the tip of the swinging rod has a rotatable lifting sprocket ff/)
is installed. The support shaft C'lU is installed at a location where 0 of the scraping sprocket is located at the inlet C (31) of the settling section C31). A fixed and rotatable sprocket is located. At the top of the raking sprocket (9) and sprocket 98) and outside the sand settling pond haze, there is a motor (40) (a fixed-position driving sprocket that is actively rotated by the three-wheel drive), and a motor (40) diagonally below it. , an intermediate sprocket (41) with a fixed position is attached, and a chute 1 for receiving the gravel that has been scraped up and transported is disposed at a position midway below the drive sprocket 10) and the intermediate sprocket l-f41). There is. Also, below the intermediate sprocket (41) is a fixed position adjustment sprocket (41) connected to a braking device (not shown).
43 is installed, and the above intermediate sprocket 0υ
and adjustment sprocket) [4: (A horizontally movable sprocket (441) is installed between the l. This shaft sprocket (441) has a heavy @!
4! It is connected to the wire +IIE with a constant force, and is constantly biased in the direction of the arrow (471).

The piston (c) attached to the lower end of the weight (c) is connected to a shock absorber f[4!1, such as a dashpot. An endless chain has many packets 511. f51)
,..., and after wrapping around the outer periphery of the driving sprocket (4G), the suspension is passed in order to the intermediate sprocket G! After wrapping around one raking sprocket, it forms a closed loop that wraps around the outer circumference of the driving sprocket (Kl). A counterweight 6 is fixed to the tip of the swinging rod (7) to which the raking sprocket is attached, and the counterweight 6) is +53
1, the raking sprocket C3η, and the oscillating rod (to) exert a force to press the raking sprocket (2) attached to the tip of the oscillating rod (to) against the bottom surface of the sedimentation part Oυ.

Therefore, when the drive sprocket (4+1) rotates in the direction of the arrow 143 (A) due to the rotation of the motor (mark 3), the chain ■ runs in the same direction, and the packet chain attached to the chain moves in the direction of the arrow 143 (A). 7, and scoops up the sediment 6η accumulated between the raking part between mark 5 and the raking sprocket (b) with the packet ff1l running in the raking part. As the packet 6υ is bent upward on the surface of the JUM sprocket (9) and lifted, the scooped-out sand is scraped up around the raking sprocket (2) and carried out of the settling basin. It will be done. The packet carrying the sediment changes its running direction approximately 180 degrees on the surface of the driving sprocket Iω, so the kIA
It is reversed between the dynamic sprocket (4■) and the intermediate sprocket +411, and the sediment inside is thrown into the chute (θ.In this way, the sediment carried to the sedimentation area Ca1l by the water flow flowing into the sedimentation area Cl0). are continuously scraped up by packets and transported into chutes.

Next, the self-load adjustment function and forced lifting operation of the raking sprocket based on the above configuration will be explained to further clarify the content of the above embodiment.

During regular raking tree planting as described above, the support shaft (to) is equipped with a counterweight and a raking sprocket (9).
, the counterclockwise rotational moment due to the weight of the rocking rod (support), etc., and the force of the packet C51) scraping up the sediment 67). ), a clockwise moment is applied due to the force for pulling up the chain part (50a) between the two, and since both moments are in balance, the raking sprocket 13n is pressed against the settling sand with a constant force, and the sand (50a) Continuous raking of '/l is carried out. Under such conditions, a large amount of soil suddenly flows into the sedimentation area from the inflow area and becomes a packet traveling along the sedimentation area (3t). When it becomes buried in sand,
The resistance of the packet raking up the sand increases and the packet is fixed in the sand, while the drive sprocket (4) continues to pull the chain part (50a), so the raking sprocket (3 force) and the drive sprocket (4) continue to pull the chain part (50a). As the tension in the chain portion (50a) between the chain 4 and 4 increases, the balance of the moments is lost, and the raking sprocket 0 swings away from the sand sink 6'7) around the support shaft (a)). The above movement of the raking sprocket causes the packets buried in the sand to separate from the sand, reducing the raking resistance and allowing the chain to move in the direction of the arrow -.The raking sprocket Qη and drive Sprocket (4 (1)
The tension in the chain part (502L) between the two is reduced and the two moments are balanced again, and the raking sprocket (9) is kept at a position where it does not sink into the sediment. work will continue. When the number of sand hoes decreases, the raking resistance decreases, and the raking sprocket is lowered F to automatically continue the regular raking work. In this way, the raking sprocket (9) swings according to the fit of the sediment that accumulates, and the raking resistance is stabilized, so that a self-load adjustment function is exhibited. In addition, as the raking sprocket rises, the length of the chain part (50b) that hangs over the sprocket (411°) between the drive sprocket (4 [1) and the submerged sprocket (to) (c) becomes longer. △, sprocket (40) ~ (4υ ~ (44) ~ (4
〜〜(31311 chain starts to loosen, but the middle sprocket) The other sprocket installed between fall and adjustment sprocket (43) As the chain is being pulled, the sprocket will move in the direction of the arrow (indicated by the arrow) to compensate for the slack in the chain, and the chain part (50b)
No slack will occur. Therefore, the force that forces the sprocket (, 14) to move in the direction of the arrow (47) may be applied not only by the weight but also by a spring or the like.

In order to prevent a large amount of earth and sand from flowing in and burying the raking sprocket etc. when the machine is stopped, raise the raking sprocket (2) to the position (9) shown by the two-point grt line when the machine is stopped. This is desirable. To perform such an operation, adjust the adjustment sprocket (apply braking force to 43I, drive the motor 0ω while preventing its forward rotation, and drive the motor 0ω) +4 (from i to the raking sprocket (9), the submersible sprocket) The hook on H381 is the chain part (5
0a) Increase the tension of (50c). Despite the rotation of drive sprocket) II, adjustment sprocket +
43) has stopped, the chain part (50C) between the sprocket ■ and the raking sprocket (3/) cannot move, and the chain part (50C) between the drive sprocket (4ot) and the raking sprocket (b) cannot move. Due to the increase in tension in the chain part (50a), the lifting sprocket C is lifted up to the position shown by the two-dot chain line, fig. 071, against the weight of the swinging part. The tension in the chain part (50b) between the sprocket (4) and the ?At sprocket (row 4) decreases, and the other sprocket moves in the direction of the arrow (4n) by the amount of slack in the chain that is caused by this, and the slack increases. When the raking sprocket □□□ reaches the above-mentioned upper limit position (I), the brake is applied to the drive sprocket (4) or the motor (G), or to prevent its reversal. Engage the ratchet on the wheel attached to the shaft.In this way the raking sprocket (3 o
is held at a position isolated from the upper surface of the sedimentation section C311, so that even if the earth and sand of personnel flows into the sedimentation section Gl), the raking sprocket 1lT7) and the packets connected thereto will not be buried in the earth and sand. Inconveniences are avoided. A braking or reversal prevention device for the above drive sprocket (+40) may be provided on the intermediate sprocket (0). When restarting with such a lifting sprocket lifted, it is sufficient to release the braking of the adjusting sprocket (4) and also release the braking or reversal prevention of the driving sprocket. (50C)
The pulling force acts on the shaft taking sprocket (+44), the other taking sprocket (4 slope) advances in the direction opposite to the arrow (47), and the raking sprocket (2) descends to settle the sand (57I). At this time, the movement of the relaxation sprocket circle is regulated by the shock absorber (4), so the other removal sprocket (4) moves at a low speed,
The impact force when the raking sprocket (9) collides with the sediment 6η is alleviated. Therefore, this shock absorbing device (49) only needs to act on the movement of the weight in the upward direction.

FIG. 4 shows that the support shaft (35a), which is the center of swing of the raking sprocket (37a), is connected to the subrocket (38a).
This shows a second embodiment in which the sprocket (3) is aligned with the rotation center axis of the sprocket (3).
The distance between 8a) and the raking sprocket (37a) is shortened, making it suitable for use when the length of the sand settling area is long.

The operation of this second embodiment is the same as that of the first embodiment, so a description thereof will be omitted here.

As described above, the present invention includes a raking sprocket that is rotatable about a fulcrum fixed to the settling basin, a chain drive device that is capable of braking or preventing reverse rotation, and a chain drive device that is provided at the upper part of the settling basin and is capable of braking. an endless chain suspended from the lifting sprocket-chain drive device and the adjusting sprocket and having a large number of packets;
The adjusting sprocket is provided between the adjustment sprocket and the chain drive device rI, and has a mounting bracket that can move forward or backward depending on the tension of the chain between the adjustment sprocket and the chain drive device, and the adjustment sprocket is provided between the adjustment sprocket and the chain drive device rI, and has a mounting plate that can move forward or backward depending on the tension of the chain between the lifting sprocket and the chain drive device. Since this sand raking device is characterized by automatically adjusting the position of the raking sprocket, even if an increase in quicksand shells flowing into the sand settling area during operation, the machine will not be damaged. The load can be adjusted independently, and even if the raking sprocket and packet on the inflow side are buried in sediment during startup, etc.
These raking sprockets, etc. can be easily removed from the sand, and when the machine is stopped, the raking sprockets can be easily lifted to an upper position away from the ground. It is possible to avoid inconveniences such as packets being buried in sediment due to the inflow of quicksand, and it is possible to easily prevent damage to chains and packets, and even damage to the drive motor. Since there is no need to separately use a special drive device to lift the parts, it is extremely inexpensive and can be expected to operate reliably.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic side views of a conventional sand settling and scraping device;
3 and 4 are schematic side views of the sand settling and scraping device d according to the first and second embodiments of the present invention. (Explanation of symbols) 30...Sand basin, 35...Fully point (support shaft), 36...
... Swinging rod, 37... Raising sprocket, 40...
Drive sprocket (chain drive device), 43... Adjustment sprocket, 50... Endless chain, 51...
・Packet, 44...Shaft sprocket. Applicant: Kobe Steel, Ltd. Agent: Patent Attorney, Civil Engineer Takeo Sho Figure 1 Figure 2

Claims (1)

[Claims] 1. A scraping sprocket that is rotatable about a fulcrum fixed to the settling basin, a chain drive device that is capable of braking or preventing reverse rotation provided on the upper part of the settling basin, a braking adjustable sprocket, and the above-mentioned scraping sprocket. An endless chain that is suspended between a lifting sprocket, a chain drive device, and an adjustment sprocket to carry a large number of packets; 1. A sand-settling raking device, characterized in that the position of the raking sprocket is automatically adjusted by fluctuations in the tension of a chain between the raking sprocket and a chain drive device.