JPH0534724Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a sand raking device that scrapes up the sand accumulated in a sand settling basin with a bucket attached to an endless chain. The present invention relates to a sand raking device that aims to reduce costs and improve durability.

BACKGROUND ART Conventionally, as an example of the above-mentioned sand settling and scraping device, there has been known a sinking prevention type sand scraping machine described in, for example, Japanese Utility Model Publication No. 1684/1984. This is the fifth
As shown in the figure, an upstream swinging arm 3a and a downstream swinging arm 3b are swingably attached to a horizontal upstream fulcrum shaft 2a and a downstream fulcrum shaft 2b provided at the upper part of the settling basin 1, respectively. The lower end of the upstream swinging arm 3a and the lower end of the downstream swinging arm 3b are connected by a conveyor frame 4, and the upstream swinging arm 3a, the downstream swinging arm 3b, and the conveyor frame 4 are made into a movable link. An upstream sprocket 5a and a downstream sprocket 5 are provided at both ends of the conveyor frame 4 to form parallel links.
A part of the bucket chain 6 as an endless chain is stretched over b.

The bucket chain 6 is equipped with buckets 7, 7, . The sand is moved in the opposite direction to the direction in which the sand flows into the sand settling tank 1, and the sand accumulated in the sand settling tank 1 is scooped up by buckets 7, 7, . . . and carried out of the channel 11.

In FIG. 5, the state of the sand-slitter and scraper under normal load is shown by a solid line, and the overloaded state is shown by a two-dot chain line. That is, when the bucket chain 6 is driven by the motor 8 in the direction shown by the arrow 9 and the sand in the settling basin 1 is being scooped up under normal load, the conveyor frame 4 moves along the solid line shown in FIG. It is almost stopped at the normal position or a position close to the normal position shown by , and only the bucket chain 6 having the buckets 7, 7, . . . is driven to scrape up the sand.

At this time, since the amount of settled sand in the settling basin 1 is an appropriate amount, the resistance when the bucket 7 scrapes off the settled sand is
Since Ta is not very large, the conveyor frame 4 is in a substantially stopped state at the normal position or a position close to the normal position shown by the solid line, as described above.

On the other hand, when a large amount of sediment flows into the settling basin during rain, etc., part or all of the bucket carts 7, 7, . In this way, Bucket 7,
7. If part or all of... is buried in the earth and sand,
An excessive load will be applied to the bucket chain 6.

That is, as the resistance force Ta shown in FIG. However, since the conveyor frame 4 is connected to the upstream sprocket 5a and the downstream sprocket 5b and can only swing around the fulcrum shafts 2a and 2b, it moves in the direction shown by the arrow 12 to the position shown by the two-dot chain line. A bucket chain 6 that has been lifted and is thereby stretched across both ends of the conveyor frame 4, and a bucket chain 6 that is attached to the chain 6,
7. ... is also lifted upwards and scooped up from the earth and sand.

The force that lifts the conveyor frame 4 in this way is due to the magnitude of the resistance force Ta related to the bucket chain 6 as described above, so the conveyor frame 4 is lifted and the buckets 7, 7, . . .
is removed from the soil, at the same time the above resistance force
Ta also becomes smaller, and the conveyor frame 4 stops again at a position where the loads of the conveyor frame 4, the buckets 7, 7, . . . , and the bucket chain 6, etc. are balanced with the resultant force of the resistance force Ta, and the conveyor frame 4 stops again to provide an appropriate load. The scraping work will be carried out under

Problems with the Prior Art As described above, the above-mentioned conventional sand settling and scraping machine has the upstream and downstream swinging arms 3 depending on the amount of inflowing earth and sand.
A and 3b swing and the conveyor frame 4 is lifted to the appropriate load position, which is excellent in that the load is automatically adjusted, but at the same time it has the following disadvantages. ing.

In the above-mentioned conventional sand raking machine, the conveyor frame 4 is an essential component in order to synchronously lift the buckets 7, 7, etc., which contribute to the sand raking, onto the sand settling basin 1. In order to move the buckets 7, 7, . This is one of the causes of cost increases. Especially sand pond 1
This tendency becomes more pronounced as the length of

As mentioned above, in the case of a normal sand scraping machine, the buckets 7, 7, etc. are buried in sand due to the inflow of earth and sand at night or when not in use.
In order to prevent the inconvenience of overloading when the device is about to be used, the conveyor frame 4 is forcibly lifted upwards when the device is not in use, to prevent the buckets 7, 7, etc. from being buried in earth and sand. As the conveyor frame 4 becomes larger and heavier, when the conveyor frame 4 is lowered into the settling basin 1, when the buckets 7, 7,... land in the settling basin 1 due to the weight of the conveyor frame 4, The impact force causes the bucket 7, 7,...or the bucket chain 6,
Furthermore, problems such as damage to the conveyor frame 4 and temporary overload caused by the buckets 7, 7, etc. being pushed into the earth and sand may occur, forcing temporary operation at low speeds, resulting in slow operation. Efficiency deteriorates.

In the conventional sand and scraper described above, operation is started with the conveyor frame 4 raised to the upper limit position, and the conveyor frame 4 is lowered to scrape up accumulated sediment on the pond bottom. However, when a large amount of sediment has accumulated on the bottom of the pond, if the conveyor frame 4 continues to descend at the same speed even after the buckets 7, 7, ... have landed on the sediment, the tension applied to the bucket chain 6 will suddenly increase. increases and becomes overloaded.

Therefore, it is necessary to detect when the buckets 7, 7, etc. have landed on the sand, and in conventional equipment, for example, a single-phase power detection circuit is installed to perform special control, which leads to high costs. ing.

Purpose of the invention The present invention aims to eliminate the drawbacks inherent in the above-mentioned prior art.

Structure of the invention In order to achieve the above object, the main means adopted by the present invention is to use a sand-settling equipment that scrapes up the sand accumulated in a sand-settling basin with a bucket attached to an endless chain. An upstream swinging arm and a downstream swinging arm are provided on the upstream side and the downstream side of the pond, and each of the upstream swinging arm and the downstream swinging arm is provided with an upstream swinging arm and a downstream swinging arm that can swing independently in a vertical plane. A part of the endless chain is wrapped around a sprocket provided at the tip so that the middle is unsupported, and the swing fulcrum shaft of the upstream swing arm is applied to the tip of the upstream swing arm. The system is installed at a position where the resultant force of the endless chain always acts in a direction to lift the upstream swinging arm, and the swinging fulcrum shaft of the downstream swinging arm is applied to the tip of the downstream swinging arm. a lifting device installed at a position where the resultant force of the endless chain always acts in a direction pushing down the downstream swinging arm, and forcibly lifts the downstream swinging arm on the downstream swinging arm; This is a sand settling and scraping device in which the two are connected via strips.

Function/Effect In normal raking conditions where the load is within the normal range, the downstream swing arm swings suitably downward (sand settling) due to the resultant force in the downward direction that acts on the tip of the downstream swing arm. The sand in the settling basin is raked up by a driven bucket attached to an endless chain stretched between sprockets provided at the ends of the upstream swinging arm and the downstream swinging arm.

When the amount of earth and sand flowing in under such conditions becomes abnormally large, the resistance force applied to the bucket, that is, the tension acting on the endless chain increases, and the resultant force lifts the upstream swinging arm, causing the upstream bucket to It is pulled out of the sand and becomes in a state where there is no resistance, reducing the resistance force applied to the endless chain. In this way, the upstream swinging arm almost stops at a position where the resistance force applied to the endless chain and the rotational force due to gravity of the upstream swinging arm, etc., which attempts to rotate the upstream swinging arm downward, are balanced. Free the endless chain from overload.

On the other hand, when no raking work is being performed, the downstream swing arm is lifted upward by the lifting device. As described above, the swing fulcrum shaft of the downstream swing arm is installed at a position where the resultant force of the endless chain acting on the tip of the downstream swing arm always acts in a direction to push down the downstream swing arm. Therefore, when the downstream swinging arm is lifted as described above, the tension acting on the endless chain increases, which also increases the lifting force on the upstream swinging arm, so that the upstream swinging arm and the downstream swinging arm are The arms are both lifted up, the endless chain stretched unsupported between them is lifted as a whole, and the bucket attached between them is removed from the sand settling basin. Therefore, inconveniences such as when the bucket is buried in settled sand due to inflowing earth and sand without scraping work will not occur.

In this way, the upstream swinging arm moves up and down in response to increases and decreases in the raking load, so it can be operated without overloading regardless of the amount of sand deposited or the state of the sediment. There is no need for extensive circuits or controls, and therefore there is no need for inefficient operations such as lowering the conveyor frame in small steps, which can improve operating efficiency.

Embodiments Next, embodiments embodying the present invention will be described with reference to FIGS. 1 to 4 to provide an understanding of the present invention.

Here, Fig. 1 is a block diagram of the entire sand settling and scraping device according to an embodiment of the present invention, Fig. 2 is a front view of an upstream swinging arm that can be used in the same embodiment, and Fig. 3 is a diagram showing the same implementation. FIGS. 4a and 4b, which are front views of the downstream swing arm that can be used in the example, are conceptual diagrams showing how force is applied in the normal load state and overload state, respectively, in the above embodiment.

It should be noted that the following example is only a specific example of the present invention, and is not intended to limit the technical scope of the present invention.

Elements common to those of the conventional device shown in FIG. 5 will be described using the same reference numerals.

The first difference between the embodiment apparatus shown in FIG. 1 and the conventional apparatus shown in FIG. 5 is that the conveyor frame 4 is omitted, and the upstream swing arm 3a' and the downstream swing arm 3b' The upstream sprocket 5 provided at each tip of the upstream swinging arm 3a' and the downstream swinging arm 3b' does not necessarily swing synchronously, but can swing independently.
a' and downstream sprocket 5b',
The point is that a part of the bucket chain 6 (endless chain) having 7, .

The second point relates to the installation location of the fulcrum shaft 2a' (swing fulcrum shaft) of the upstream swing arm 3a'. That is, as shown in FIG. 4a, the fulcrum shaft 2a' receives the resultant force of the tensions Ta and Ta of the bucket chain 6 acting on the tip of the upstream swinging arm 3a'.
Ta' is installed at a position where it always acts in a direction (clockwise in FIG. 1) to lift up the upstream swing arm 3a'.

Furthermore, as a third point, the fulcrum shaft 2b' (swinging fulcrum shaft) of the downstream swinging arm 3b' is able to absorb the tension of the bucket chain 6 acting on the tip of the downstream swinging arm 3b'. The resultant force Tb′ of Tb and Tb is always
The point is that it is installed at a position that acts in a direction to push down the downstream swing arm 3b' (clockwise in FIG. 1).

In addition, 13 in FIG. 1 is driven by a motor 14 and is a lifting chain ( During the sand scraping operation, it is designed to be able to swing according to the magnitude of the resultant force Tb' within the range until the downstream swing arm 3b' comes into contact with a stopper 24, which will be described later. The tension is released. Also, 15
a, 15b, 15c are guide sprockets, 16
is a swinging lever 1 that can swing freely around a fulcrum shaft 17.
A sprocket for removing slack is attached to the tip of 8, a driving sprocket 19 is rotationally driven by a motor 20, and a hopper 21 receives the sediment lifted by the bucket 7.

In addition, in FIG. 1, the upstream swing arm 3
The solid line shows the state in which a' and the downstream swing arm 3b' are both lifted, that is, the bucket carts 7, 7, ... are evacuated from the sand settling, and the two-dot chain line shows the state in which normal scraping work is being performed. are shown respectively.

The fulcrum shaft 2 of the upstream swing arm 3a' as described above
Geometrically speaking, a' is a horizontal line A passing through the center of the upstream sprocket 5a' as shown in FIG.
It is placed within a region X surrounded by a line of action B extending in the direction of the resultant force Ta'.

Further, the fulcrum shaft 2b' of the downstream swing arm 3b' is
Vertical line C passing through the center of downstream sprocket 5b'
and passes through the center of the downstream sprocket 5b',
It is located within an area Y surrounded by the tension Tb of the bucket chain 6 acting on the downstream sprocket 5b' and a line of action D drawn in the direction of the resultant force Tb' of Tb.

In addition, 22 and 23 are stoppers that are the upper and lower limits of the upstream swing arm 3a', and 24
is a stopper which is a contact point at the lower limit of the downstream swing arm 3b'.

Next, the operation of the above embodiment will be explained.

During normal scraping work, since the tension Ta of the bucket chain 6 acting on the upstream sprocket 5a' is small, the force that tries to lift the upstream swinging arm 3a' upward is due to the resultant force Ta'. The downward torque based on the gravity of the upstream sprocket 5a' and the upstream swinging arm 3a' overcomes this, and the upstream sprocket 5a' is moved to the lower position as shown in FIG. ... is kept moving along the settling basin 1.

In this case, for the downstream sprocket 5b', the tensions Tb and Tb acting on the bucket chain 6 are
Since the resultant force Tb' acts in a direction to push the downstream swing arm 3b' downward, the downstream sprocket 5b' is located at approximately the same height as the upstream sprocket 5a'.

Next, the scraping resistance applied to the bucket 7 increases due to the inflow of a large amount of mud and sand, and the tension acting on the upstream sprocket 5a of the bucket chain 6 increases.
As Ta and Ta increase, the torque that attempts to lift the upstream swinging arm 3a' due to the resultant force Ta', the line of action B, and the distance la' between the fulcrum shaft 2a' increases, and the fulcrum shaft 2a' The upstream swinging arm 3a overcomes the downward torque due to the product of the horizontal distance la between the upstream sprocket 5a' and the weight Wa of the upstream sprocket 5a' and the upstream swinging arm 3a'. ' is lifted as shown by the arrow in Figure 4b,
Bucket 7 on the side closer to upstream sprocket 5a',
7,... is lifted from the sand, the tension Ta acting on the bucket chain 6 decreases,
Overload is eliminated. In this case as well, the downstream sprocket 5b' is maintained in a depressed state.

Finally, a case will be described in which the lifting chain 13 is wound up by the motor 14 constituting the lifting device and the downstream swing arm 3b' is lifted as shown by the solid line in FIG. 1 due to suspension of service or the like.

The fulcrum shaft 2b' of the downstream swinging arm 3b' is such that the resultant force Tb' of the tension Tb of the bucket chain 6 acting on the tip of the downstream swinging arm 3b' is always Since the downstream swing arm 3b' is forcibly lifted as described above, the tension Tb of the bucket chain 6 increases. As a result, the tension Ta of the bucket chain 6 with respect to the upstream sprocket 5a' also increases, and the resultant force Ta' lifts the upstream swinging arm 3a' upward, thereby causing the upstream sprocket 5a' and the downstream The bucket chain 6, which is stretched unsupported between the side sprockets 5b', is lifted as a whole and removed from the sand settling basin 1. Therefore, if this state is maintained during suspension of operation, even if the amount of sediment inflow increases abnormally, the buckets 7, 7,
This avoids the inconvenience of being buried in sand and causing an overload at startup.

As mentioned above, in this embodiment, the conveyor frame required in the conventional device is completely unnecessary, and the weight of the entire device can be reduced, contributing to cost reduction, and the lifting chain 13 can be loosened. Therefore, even if the upstream swing arm 3a' and the downstream swing arm 3b' are lowered as shown by the solid lines in FIG. 1, the sprockets 5a', 5b' and each swing Only their own weight acts on the movable arms 3a' and 3b', and the weight of the heavy conveyor frame 4 unlike in conventional devices does not act on the movable arms 3a' and 3b'. There are inconveniences such as damaging the sprockets 5a and 5b, as well as the upstream and downstream swing arms 3a', 3b', and the disadvantage that the buckets 7, 7, etc. attached to the bucket chain 6 are sunk into the sand settling. Therefore, an appropriate load condition can be obtained at all times.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the entire sand settling and scraping device according to an embodiment of the present invention, Fig. 2 is a front view of an upstream swinging arm that can be used in the embodiment, and Fig. 3 is a diagram of the same embodiment. A front view of a downstream swinging arm that can be used, FIGS. 4a and 4b are conceptual diagrams showing the degree of force applied in the normal load state and overload state in the above embodiment, respectively, and FIG. 5 is a conventional sand settling arm. FIG. 2 is a view corresponding to FIG. 1 showing the raking device. Explanation of symbols, 1...Sand basin, 2a', 2b'...Fully shaft (swinging fulcrum shaft), 3a'...Upstream swinging arm,
3b'...Downstream swing arm, 5a'...Upstream sprocket, 5b'...Downstream sprocket, 6...
Bucket chain, 7... Bucket, A, C...
Horizontal line, B, D... Line of action, 13... Lifting chain (stripe body), 14... Motor, 22, 23, 24...
Stotspa.

Claims (1)

[Scope of Claim for Utility Model Registration] In a sand raking device that scrapes up the sand accumulated in a sand settling basin with a bucket attached to an endless chain, the upstream and downstream sides of the settling basin swing independently in a vertical plane. A freely movable upstream swinging arm and a downstream swinging arm are provided, and a part of the endless chain is attached to a sprocket provided at each tip of the upstream swinging arm and the downstream swinging arm. The upstream swinging arm is suspended so that it is unsupported, and the resultant force of the swinging fulcrum shaft of the upstream swinging arm and the endless chain acting on the tip of the upstream swinging arm always lifts the upstream swinging arm. The downstream swing arm is installed at a position where it acts in the direction, and the swing fulcrum shaft of the downstream swing arm is such that the resultant force of the endless chain acting on the tip of the downstream swing arm always pushes down the downstream swing arm. What is claimed is: 1. A sand-settling and scraping device, which is installed at a position where it acts in a direction, and is connected to the downstream swinging arm via a strip of elevating device that forcibly lifts the downstream swinging arm.