JPH0215526Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sand settling device that can be applied to a traveling bucket sand settling device, a traveling sludge scraping machine, and the like.

Bucket-type grit pumps like the one shown in Figure 1 are often installed and used in sand settling basins such as sewage treatment plants, but the sand scraping machine for sand settling basins 1 installed in parallel is carried out as shown in Figure 2. For example, as shown in FIG. 3, a single device with a sand-scraping bucket 5 that can be raised and lowered is increasingly used to move the sand to designated ponds one after another.

For sand raking, both sides are attached to chain 4, and the cross section is V.
A shaped bucket 5 moves upstream along a guide frame 11 suspended near the bottom of the sand settling basin 1, scrapes up the sand, scoops up the collected sand on the upstream side, pulls it up, and turns it over on the chute 2. After the sand is put into the conveyor 7, the operation of descending from the outflow side of the settling basin to the bottom of the settling basin and raking up the sand is repeated.

The bucket belts 5 are attached (in plural) to the chain 4 with a certain gap, and the bucket belts 5 are attached by rotating the chain 4.
is moving. The guide frame 11 is suspended (or pushed up) by a wire (or bar-shaped steel, etc.) 10 and lowered onto the settling sand to perform sand raking. However, when sand raking is not being carried out, the guide frame 11 is suspended above the upper surface of the sand settling basin 1. Pull it up high. Note that when the guide frame 11 is pulled up, it becomes possible to move to another settling basin 1.

As described above, in the conventional apparatus, the guide frame is suspended by a wire or the lifting member 10 in addition to the bucket conveyor, and the guide frame is moved up and down by interlocking with a tensioning device or by separately providing a driving device such as a wire. It has also been considered to tension the bucket conveyor using the driving force of a tensioning device to move the guide frame up and down.

Therefore, in addition to the bucket conveyor drive device, a drive device for raising and lowering the guide frame must be provided, or a tension device must be used to forcibly pull the bucket conveyor sideways, which requires a large amount of force, resulting in a large device. It was hot.

The present invention was proposed in order to solve the above-mentioned drawbacks of the conventional method, and after scraping off the sediment by moving a chain equipped with a large number of buckets through the water, the chain is sent out to the top of the settling basin to scoop it up. In a sand scraping device that circulates sand after it has been discharged and then sends it back into the water, the chain consists of a sprocket that is linked to a drive or braking device installed at two locations on the left and right upper parts of the device, and a sprocket that connects the water and the top surface of the pond. It is hung on sprockets attached to both sides of a guide frame that can move up and down in a horizontal state, and on a sprocket that is installed on the top of the pond and moves up and down to take up slack.
By having both sides move in the same direction or in opposite directions, the sprocket is rotated to send the bucket conveyor, unlike pulling the middle of the bucket conveyor in a direction perpendicular to its movement. , the movement becomes smoother, the power required to raise and lower the guide frame is reduced, and the structure is simple as only a simple driving or braking device is required, and the parts used also serve as a raking device, so fewer parts are used. It is an object of the present invention to provide a sand-settling and scraping device which has the following effects: the tension device can be easily downsized.

An embodiment of the present invention will be explained below with reference to the drawings. Fig. 6 shows an embodiment of the present invention, 1 is a settling basin, 1c and 1d are inlet and outlet waterways connected to the settling basin, 1a and 1b are These are the bottom and top of the settling basin, respectively. 7 is an unloading conveyor, 13 is a running rail of the sand settling device 20, both of which are connected to the top surface 1b of the sand settling basin.
to be installed. Reference numeral 12 denotes wheels that roll on rails 13 to move the sand settling and scraping device of the apparatus to the main body frame 9, and the driving device for driving is not shown.

2 is a chute, 3a is a drive device for sand raking,
It also serves as a drive device for raising and lowering the guide frame 11. 3b is the same drive device 3a on the main body frame 9.
It is installed on the other end side and is a driving device or a braking device for raising and lowering the guide frame 11. 4 is an endless state (chain) with two chains, which are installed separately on the left and right sides for the inflow, and between the left and right chains 4, a bucket 5 for scraping up the sediment 15 is installed, and it is rotated (circularly) with the chain 4.
move. 5 is a bucket bag with a V-shaped cross section, and may have a drainage hole.

6 is a sprocket for rotating the chain 4, 6b is installed at both ends of the guide frame 11, 6a is connected to a braking or driving device in an intermittent manner, and 6c is a driving device and guide frame for sand raking. It is connected to No. 11 lifting drive device. Reference numeral 8 denotes a tensioning device for the chain 4, which detects slack in the bucket conveyor (chain 4) as the guide frame 11 moves up and down, and uses a drive device (not shown) to absorb the slack in the bucket conveyor. Install one or several units on the main body frame. 9
Reference numeral 11 indicates a main body frame that extends horizontally across the length of the pond, 11 a guide frame having a length approximately corresponding to the length of the pond, and 14 a stabilizing device that maintains an appropriate posture of the guide frame. The sprocket 8b of the tensioning device 8 functions to take up slack in the chain 4 by moving up and down at the positions indicated by the solid line and the two-dot chain line in FIG.

Next, to explain the operation, Fig. 4 and Fig. 5 show the operating state when the guide frame rises from A to B, and Fig. 4 shows the operation state when the tensioning device 8b is moved from C to D. Fig. 5 shows a conventional device for pulling up a conveyor, and Fig. 5 shows a sprocket 6a,
6c is a diagram illustrating an embodiment of the present invention which pulls up a bucket conveyor by rotationally driving the bucket conveyor 6c.

First, in FIG. 4, after stopping the sand raking drive device, when the tensioning device 8b is pulled and moved laterally from C to D, it is not moved to the bucket conveyors on both sides of the sprockets 6c and 6a. A force is applied to try to do so. However, because the sprocket 6c does not rotate due to the resistance of the drive device, the bucket conveyors A to B1 do not move, and only the bucket conveyor on the sprocket 6a side moves. At this time, sprocket 6a
and 6b rotate in the direction shown by the arrow, and at the same time, the redundant bucket conveyor is rotated to the sprocket 6a.
It is absorbed between C and D of tension through the side.

Next, in Fig. 5, when pulling up the guide frame, if the sprockets 6c and 6a are rotated in the direction shown by the arrow, the bucket conveyor corresponding to the length of A to B is pulled upward through the sprocket. . At this time, as the boom of each tensioning device rotates, the sprockets at both ends of the boom press against the bucket conveyor as if folding it up, absorbing the excess bucket conveyor. However, since the guide frame rises in a horizontal state, the bucket conveyor between A and B below the guide frame does not move, and the sprockets 6b and 6b do not move.
6b is also stopped. Therefore, sprocket 6c,
When hoisting the bucket conveyor in 6a,
There is no need to apply excessive tension between the bucket conveyors A and B, and the tensioning device simply needs to absorb the excess bucket conveyor.

Power P required to raise the guide frame now
can be expressed by the following formula.

P=G+R+S+X where G: Power required to raise the guide frame R: Power required for the bucket to slide and move on the guide frame S: Sum of power required for each sprocket to rotate The sum of power, power, etc. that prevents the sprocket of the tensioning device from returning in the C direction due to the weight of the bucket conveyor when it is pulled from C to D. Comparing the magnitude of the power, (a) G has the same weight and distance, so Figures 4 and 5 are the same.

(b) In Figure 4, the bucket conveyor remains stopped, so R=0, and only Figure 5 is required.

(c) The product of the resultant force of the bucket conveyor's tension, its own weight, etc., and its rotational speed is the rotational power of the sprocket. Figure 4 has more sprockets,
The tension of the bucket conveyor increases as shown in Figure 5, which has a lot of resistance, and the rotational speed of each sprocket except for one has doubled, so the sum S
Figure 4 is several times more common.

(d) X in Fig. 4 indicates that the weight of the bucket conveyor that has been lifted up and the tension generated by the tensioning device work in a direction that facilitates the rotation of the sprockets 6c and 6a. However, X in Fig. 5 is because the weight of the bucket conveyor is relatively large, and the span (distance between fulcrums) becomes long because it is pulled without support along the way.
Power is required to maintain the position of the sprocket 8b. Therefore, the required power P in FIG. 5 is smaller than the required power in FIG. 4.

Next, to explain the operation side in detail, the operation is performed as shown in I to E.

(a) Lift and hold the guide frame.

(1) Lock the tension device.

(2) Braking sprockets 6c and 6a or
The drive unit then stops.

(3) When the guide frame is raised, it locks onto the main frame.

(b) First descent (stop raking and descend under its own weight).

(1) Reverse the tensioning device (reverse operation).

(2) Reverse the lifting drive of either or both of the sprockets 6c and 6a. however,
When one side is operating, the other side is braked to stop rotation.

(c) Second descent (descending while raking or stopping the descent).

(1) Drive the sprocket 6c to lift (rotate), set the sprocket 6a free, and reverse the tensioning device (reverse operation). Or stop.

(2) If the sprocket 6c is driven (rotated) and the sprocket 6a is rotated a little faster than the sprocket 6c, the guide frame will descend at half the speed difference, and if the speed is the same, the guide frame will descend. stops.

Conversely, if the sprocket 6a is rotated slower than the sprocket 6c, the guide frame will rise, making it easier to move up and down at low speed.

(d) Landing operation (1) Appropriately tension the bucket conveyor using the tensioning device, free sprocket 6a, and perform raking operation.

(2) The sprocket 6a may be operated at the same speed as the lifting speed.

(e) Raise (1) Drive (rotate) both or one of the sprockets 6c and 6a to raise the bucket conveyor and raise the guide frame. However, when one side is in operation, the other side is braked to stop rotation.

Since the present invention is configured as explained in detail above, the resistance can be reduced and the required power can be reduced, and since the driving force is distributed to two places and raised, the force is dispersed and the number of parts used can be reduced. Furthermore, since the rotation of the sprocket is used as the driving force, the lifting is smooth, and the sprocket can also be used for guiding the bucket conveyor of the sand settling and scraping device.

By setting the speeds of the raking drive device and the guide frame raising drive device to predetermined speeds, it is possible to lower at a low speed or to lower at a low speed while raking.
Additionally, the hanging wire of the guide frame can be stopped, and the tensioning device can also be made smaller, making it easier to reduce the size of incidental equipment. Furthermore, using a microcomputer,
By controlling the rotation of the two sprockets and the drive of the tensioning device according to variables and loads, it can be adapted to a wide range of driving operations.

In addition, the chain of the present invention has two
The guide frame is connected to a sprocket that is linked to a drive or braking device installed at the location, and to a sprocket attached to both sides of the guide frame that can move up and down horizontally underwater and on the surface of the pond, so it is necessary to raise the guide frame. The supply of driving force can be distributed, and the output of the driving device and the strength of the chain can be reduced by approximately half, thereby preventing the device from becoming too large. Furthermore, since the guide frame can be completely raised to the surface of the pond, a single raking device can be moved between multiple sand basins for raking work, eliminating the need for idle equipment in large-scale facilities. be able to. Furthermore, since both sides of the chain can be moved in the same direction or in opposite directions, various operations can be performed depending on the situation, such as slow descent of the guide frame and slow descent during sand-scattering operations.

[Brief explanation of the drawing]

Figures 1 and 2 are side views of a conventional bucket type sand scraper, Figure 3 is a detailed view of the main parts of Figure 2, and Figure 4 is a guide frame elevation in a conventional sand scraper. FIG. 5 is an explanatory diagram showing the lifting and lowering state of the guide frame in the sand-scraping device according to the embodiment of the present invention. FIG. 6 is a side view of the sand-scraping device showing the embodiment of the present invention. It is. Explanation of the main parts of the diagram, 1...Sand basin, 3a, 3
b... Raising drive device, 4... Chain, 5... Bucket, 6, 6a, 6b, 6c... Sprocket,
9...Main frame, 11...Guide frame,
15...Sand settling, 20...Sand raking device.

Claims (1)

[Scope of utility model registration request] A sediment scraping device that circulates a chain equipped with a number of buckets by moving it through the water to scrape off sediment, then sending the chain to the top of the settling basin, discharging the scooped up sediment, and then sending it back into the water. The chain consists of a sprocket that is connected to the drive or braking device installed in two places on the left and right upper parts of the equipment, and a sprocket that is attached to both sides of a guide frame that can move up and down in the water and on the surface of the pond in a horizontal state. 1. A sand raking device, characterized in that it is hung on a slack-taking sprocket that is provided on a surface and moves up and down, so that both sides move in the same direction or in opposite directions.