JP2024014206A - Bucket for scraping away bulk material - Google Patents

Abstract

To provide a bucket for scraping away a bulk material, which can suppress the adhesion of a bulk material to a bucket by preventing the generation of rust, and enables weight saving of the bucket.SOLUTION: A bucket for scraping away a bulk material comprises: an arc-shaped curved plate 28A in which a longitudinal section along a scrape-away direction becomes convex rearward; a top plate 28B overhanging forward from the front-end upper portion of the arc-shaped curved plate 28A in the scrape-away direction; a bottom plate 28C overhanging forward from the front-end lower portion of the arc-shaped curved plate 28A in the scrape-away direction; and side plates 28D covering both right and left ends of the arc-shaped curved plate 28A, the top plate 28B, and the bottom plate 28C. The arc-shaped curved plate 28A, the top plate 28B, the bottom plate 28C and the side plates 28D are formed of a corrosion-resistant material and are polished by a bulk material 7 which is scraped away and flows.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bucket for scraping loose materials.

In general, continuous unloaders are used to unload bulk materials such as coal and iron ore from ship holds at ports, reclaimers are used to remove bulk materials piled up in coal storage facilities, and stackers are used to load bulk materials into coal storage facilities. A stacker reclaimer that has both the functions of a reclaimer is equipped with a bucket for scraping and transporting loose materials.

The continuous unloader has a configuration as shown in FIG. 4, for example. The continuous unloader 100 shown here has a rotating frame 5 equipped with a tiltable boom 4 on a traveling frame 3 that can freely run on rails 2 laid on a quay 1, and a cargo hold 6 at the tip of the boom 4. It has a structure in which a bucket elevator 8 is suspended to scrape loose materials 7 from inside the cargo hold 6 and carry it out to the outside of the cargo hold 6. A boom conveyor 9 is disposed inside the boom 4 to convey the bulk material 7 scraped off by the bucket elevator 8 to the base end side of the boom 4. Further, the traveling frame 3 is provided with a carry-out conveyor 10 for carrying out the bulk material 7 fed from the boom conveyor 9 via the chute 11 to the outside of the traveling frame 3.

As shown in FIGS. 4 and 5, the bucket elevator 8 is constructed by pivoting a main body frame 12 extending in the vertical direction to the tip of a boom 4. At the lower end of the main body frame 12, there is a scraping frame 15, which has an inner frame 14 telescopically disposed so as to be nested in an outer frame 13 with an open end. It is mounted almost horizontally. Sprockets 16 and 17 are provided at the base end of the outer frame 13 and the tip of the inner frame 14 of the scraping part frame 15, and the sprockets 16 and 17 and the sprocket 18 provided at the upper part of the main body frame 12 have a large number An endless chain 20 with a bucket 19 for scraping loose items 7 is attached to the chain 20.

The inner frame 14 is expanded and contracted with respect to the outer frame 13 by the expansion and contraction operation of the cylinder 21. In addition, in order to prevent the tension of the chain 20 from changing due to the expansion and contraction of the inner frame 14, the outer frame 13 is connected to an elevating frame 23 that can be raised and lowered with respect to the main frame 12 by the expansion and contraction operation of a cylinder 22. There is. As shown by the solid line in FIG. 5, when the cylinder 21 expands and the inner frame 14 extends with respect to the outer frame 13, the cylinder 22 expands in conjunction with the operation of the cylinder 21, and the cylinder 22 extends through the lifting frame 23. The frame 13 is raised in a manner that it is drawn toward the main frame 12 side. On the other hand, when the cylinder 21 contracts and the inner frame 14 contracts with respect to the outer frame 13 as shown by the imaginary line in FIG. Through this, the outer frame 13 is lowered away from the main frame 12 side, so that the tension of the chain 20 is always maintained constant.

In addition, in FIG. 4, 24 is a balancing lever provided on the top of the revolving frame 5 so that it can be raised and lowered freely, and the main body frame 12 of the bucket elevator 8 is attached to the tip of the balancing lever 24 via the top frame 25. The boom 4, the balancing lever 24, the swing frame 5, and the top frame 25 form a parallelogram link mechanism. A rotary feeder 27 is built into the top frame 25. Further, a counterweight 26 is attached to the rear end of the balancing lever 24.

As the chain 20 rotates, the loose items 7 inside the hold 6 are scraped off by the bucket 19 of the bucket elevator 8 and transferred upwards, where they fall onto the rotary feeder 27 and are transferred onto the boom conveyor 9. is carried by the boom conveyor 9 from the distal end to the proximal end of the boom 4, drops onto the carry-out conveyor 10 via the chute 11, and is carried out to the outside of the traveling frame 3 by the carry-out conveyor 10. There is.

In such a continuous unloader 100, there is a problem in that loose materials 7 adhere to and accumulate on the inside and outside surfaces of the bucket 19 during operation. There was a risk that the load on the tip of the boom 4 would become too large, making it impossible to continue cargo handling. Further, when bulk materials 7 accumulate inside the bucket 19, the effective volume of the bucket 19 decreases by that amount, resulting in a problem in that cargo handling efficiency decreases.

Therefore, when performing cargo handling work using the continuous unloader 100, it is necessary to periodically perform cleaning work before the amount of bulk material 7 accumulated in the bucket 19 becomes large. This meant that cargo handling operations had to be temporarily suspended, resulting in wasted costs such as port usage fees, as well as additional costs for the cleaning itself, including labor costs. Moreover, there is also the problem of processing the cleaning waste water mixed with the dregs of the loose material 7, and the cleaning of the bucket 19 as a whole requires a large cost.

On the other hand, the bucket 19 is washed with high-pressure water, but if the accumulated loose material 7 is strongly adhered to the bucket 19, it may not be possible to wash it off with just a jet of high-pressure water, and the worker must directly clean it by hand. The work of peeling it off was extremely hard work. Particularly, the loose materials 7 adhering to the inside of the bucket 19 tend to stick together because pressure is applied to them during the scraping operation during cargo handling operations, and the loose materials 7 are piled up while being compacted.

In addition, in recent years, low-grade coal such as lignite and sub-bituminous coal has been increasingly used as fuel in thermal power generation, etc., but these low-grade coals have a high water content and are powdery and bulky. The substance 7 became muddy and easily adhered to the bucket 19. Therefore, when unloading low-grade coal, problems such as the above-mentioned load on the tip of the boom 4 and loss of capacity of the bucket 19 are particularly likely to occur, and cleaning operations must be performed more frequently. Ta.

In order to solve these problems of the conventional bucket 19, the present applicant has already filed an application for a bucket 28 (see FIG. 6) on which loose objects 7 are less likely to adhere to the inner surface, and the bucket 28 is disclosed in Patent Document 1. ing.

Japanese Patent Application Publication No. 2017-81705

However, although the bucket 28 as disclosed in Patent Document 1 is very good in terms of fluidizing the bulk material 7 inside it, it is made of a steel plate (wear-resistant steel plate, SM material) that is not corrosion resistant. The inventors of the present invention have discovered that since the paint was used in a painted state, if the paint peels off and rust occurs after long-term use, loose materials 7 such as coal may adhere to the rusted areas. revealed by research.

In addition, it is necessary to provide a corrosion allowance in the bucket 28 in anticipation of the occurrence of rust, which inevitably leads to an increase in weight, leaving room for improvement.

The present invention has been made in view of the above-mentioned conventional problems, and aims to provide a bucket for scraping loose materials that can prevent the occurrence of rust, suppress the adhesion of loose materials, and also be lightweight. It is.

The present invention provides a bucket for scraping loose materials for scraping and transporting loose materials.
an arcuate curved plate portion whose vertical cross section along the scraping direction is convex toward the rear;
a top plate portion extending forward from the upper part of the front end in the scraping direction of the curved plate portion;
a bottom plate portion extending forward from a lower front end in the scraping direction of the curved plate portion;
comprising the curved plate part, a top plate part, and a side plate part that covers both left and right ends of the bottom plate part,
The present invention relates to a bulk material scraping bucket in which the curved plate part, top plate part, bottom plate part, and side plate part are formed of a corrosion-resistant material, and which is polished by scraped and flowing bulk materials.

In the bulk scraping bucket, the corrosion-resistant material may be stainless steel.

In the bucket for scraping bulk materials, the bulk materials may be coal.

According to the bucket for scraping loose materials of the present invention, it is possible to achieve the excellent effects of preventing the occurrence of rust, suppressing the adhesion of loose materials, and reducing the weight.

BRIEF DESCRIPTION OF THE DRAWINGS It is an exploded perspective view which shows the Example of the bucket for scraping loose materials of this invention, Comprising: It is a figure which shows the state in which the bucket moves in the scraping direction. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the Example of the bucket for scraping loose materials of this invention, Comprising: It is a figure which shows the state in which a bucket moves upward. FIG. 2 is a perspective view showing an embodiment of the bucket for scraping bulk materials of the present invention, and is a diagram showing a state in which the bucket moves in a direction opposite to scraping. FIG. 1 is a schematic configuration diagram showing a continuous unloader equipped with a conventional bucket for scraping loose materials. FIG. 5 is a detailed diagram showing a part of FIG. 4 in an enlarged manner. FIG. 2 is a side view showing a bucket invented by the present inventors and for which an application has already been filed.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show embodiments of a bucket for scraping loose materials according to the present invention, and in the figures, parts denoted by the same reference numerals as in FIGS. 4 to 6 represent the same parts.

The bucket 28 for scraping and transferring loose materials 7 such as coal in this embodiment includes a curved plate part 28A, a top plate part 28B, a bottom plate part 28C, and a side plate part 28D.
The curved plate portion 28A is an arcuate portion whose vertical cross section along the scraping direction is convex toward the rear.

The top plate portion 28B is a portion that projects forward from the upper front end of the curved plate portion 28A in the scraping direction.

The bottom plate portion 28C is a portion that projects forward from the lower front end in the scraping direction of the curved plate portion 28A.

The side plate portion 28D is a portion that covers both left and right ends of the curved plate portion 28A, the top plate portion 28B, and the bottom plate portion 28C.

The curved plate portion 28A, the top plate portion 28B, the bottom plate portion 28C, and the side plate portions 28D are made of a corrosion-resistant material such as stainless steel, and are scraped and polished by the flowing loose material 7. ing.

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

As shown in FIG. 1, the bucket 28 scrapes off the loose material 7 while moving in the scraping direction, and is provided with an arc-shaped curved plate portion 28A whose longitudinal section along the scraping direction is convex toward the rear. As a result, the flow of loose materials 7 such as coal is promoted inside the bucket 28, and the loose materials 7 act like an abrasive, mainly on the inner surface of the bottom plate portion 28C and the inner surface of the curved plate portion 28A near the bottom plate portion 28C. and the inner surface of the side plate portion 28D near the bottom plate portion 28C are polished to a mirror finish.

Subsequently, when the bucket 28 changes its direction from the state shown in FIG. 1 to open upward as shown in FIG. The inner surface of the curved plate portion 28A and the inner surface of the side plate portion 28D closer to the curved plate portion 28A are polished to a mirror finish.

Further, when the bucket 28 changes its direction from the state shown in FIG. 2 to the state shown in FIG. It flows as if sliding toward the inner surface of the top plate portion 28B, and mainly the inner surface of the top plate portion 28B, the inner surface of the curved plate portion 28A near the top plate portion 28B, and the inner surface of the side plate portion 28D near the top plate portion 28B are polished, resulting in a mirror surface. be converted into

In the case of this embodiment, it is possible to fluidize the loose material 7 inside the bucket 28 and make it function as an abrasive for the corrosion-resistant material, thereby preventing the paint from peeling off and rusting even after long-term use. This prevents loose materials 7 such as coal from adhering to rust-generated areas.

Further, the bucket 28 of this embodiment is made of a corrosion-resistant material such as stainless steel and does not rust, so there is no need to provide a corrosion allowance, and the weight can be reduced. Incidentally, while the conventional bucket 28 weighed 204 kg, the bucket 28 of this embodiment weighed 185 kg, reducing the weight by about 10%.

Furthermore, in the case of this embodiment, since the bucket 28 is made of a corrosion-resistant material, the initial installation cost increases, but the life span is extended, which leads to cost reductions overall. Furthermore, even if loose materials 7 such as coal adhere to the bucket 28, they can be easily removed, making maintenance easier and reducing cleaning costs.

Moreover, in the bucket 28 of this embodiment, the corner portion where the curved plate portion 28A, the top plate portion 28B, and the side plate portion 28D are joined, and the corner portion where the curved plate portion 28A, the bottom plate portion 28C, and the side plate portion 28D are joined. It is not necessary to bend each of them into a three-dimensionally rounded shape, which is also effective in reducing manufacturing costs.

The present inventors replaced two of the 60 buckets 19 provided in the actually operated continuous unloader as shown in FIGS. 4 and 5 with the buckets 28 of this embodiment. We then conducted an actual machine test.

In the actual machine test, the operating time was set to 22,500 minutes (375 hours), and the adhesion status of loose materials 7 was visually confirmed, and the adhered loose materials 7 were collected and weighed.

In visual inspection, it was found that the conventional bucket 19 had a noticeable amount of loose objects 7 attached to it, whereas the bucket 28 of this embodiment had only a considerably smaller amount of loose objects 7 attached than the conventional bucket 19. I hadn't.

Furthermore, the results of collecting and weighing the loose materials 7 attached to each of the buckets 19 and 28 were as shown in [Table 1].

In other words, it has been demonstrated that, compared to the conventional bucket 19, one bucket 28 makes it difficult for about 10 kg of loose material 7 to adhere, and 60 buckets 28 can suppress the adhesion of about 600 kg of loose material 7. .

In this way, it is possible to prevent the occurrence of rust and the adhesion of loose materials 7, and also to reduce the weight.

It should be noted that the bucket for scraping loose materials of the present invention is not limited to the above-mentioned embodiments. For example, the bucket can be applied not only to continuous unloaders but also to reclaimers and stacker reclaimers. Of course, various changes can be made without departing from the gist of the invention.

1 Quay 2 Rail 3 Traveling frame 4 Boom 5 Swivel frame 6 Hold 7 Bulk goods 8 Bucket elevator 9 Boom conveyor 10 Unloading conveyor 11 Chute 12 Main frame 13 Outer frame 14 Inner frame 15 Scraping part frame 16 Sprocket 17 Sprocket 18 Sprocket 19 Bucket 20 Chain 21 Cylinder 22 Cylinder 23 Lifting frame 24 Balancing lever 25 Top frame 26 Counterweight 27 Rotating feeder 28 Bucket 28A Curved plate portion 28B Top plate portion 28C Bottom plate portion 28D Side plate portion 100 Continuous unloader

Claims (3)

In the bucket for scraping loose materials and transporting them,
an arcuate curved plate portion whose vertical cross section along the scraping direction is convex toward the rear;
a top plate portion extending forward from the upper part of the front end in the scraping direction of the curved plate portion;
a bottom plate portion extending forward from a lower front end in the scraping direction of the curved plate portion;
comprising the curved plate part, a top plate part, and a side plate part that covers both left and right ends of the bottom plate part,
A bucket for scraping bulk materials, in which the curved plate part, the top plate part, the bottom plate part, and the side plate parts are formed of a corrosion-resistant material, and are polished by scraped and flowing bulk materials. A bucket for scraping loose materials according to claim 1, wherein said corrosion-resistant material is stainless steel. The bucket for scraping bulk materials according to claim 1 or 2, wherein the bulk materials are coal.

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