Bucket for scraping loose material

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

Technical Field

[0001] The present invention relates to a bucket for scraping bulk materials.

Background Art

[0002] Generally, a continuous unloader used for discharging bulk materials such as coal and iron ore from a ship's hold at a port, a reclaimer for discharging bulk materials piled up in a coal storage facility, and a stacker having both functions of stacking bulk materials in a coal storage facility and the reclaimer are provided with a bucket for scraping and transporting bulk materials.

[0003] [[ID=第十五]] The continuous unloader has, for example, a configuration as shown in FIG. 4. The continuous unloader 100 shown here is provided with a swivel frame 5 having a tiltable boom 4 on a traveling frame 3 that can travel on rails 2 laid on a quay wall 1. A bucket elevator 8 for scraping bulk materials 7 inside a ship's hold 6 and discharging them outside the ship's hold 6 is suspended at the tip of the boom 4. Inside the boom 4, a boom conveyor 9 for transporting the bulk materials 7 scraped by the bucket elevator 8 to the proximal end side of the boom 4 is disposed. Further, on the traveling frame 3, a discharge conveyor 10 for discharging the bulk materials 7 fed from the boom conveyor 9 via a chute 11 to the outside of the traveling frame 3 is disposed.

[0004] As shown in FIGS. 4 and 5, the bucket elevator 8 is configured by pivotally attaching a main body frame 12 extending in the vertical direction to the tip of the boom 4. At the lower end of the main body frame 12, a scraping portion frame 15 in which an inner frame frame 14 is telescopically disposed in an outer frame frame 13 with an open end face is attached substantially horizontally via a lifting frame 23. Sprockets 16 and 17 are provided at the proximal end of the outer frame frame 13 and the distal end of the inner frame frame 14 of the scraping portion frame 15, and an endless chain 20 to which a large number of buckets 19 for scraping bulk materials 7 are attached is wound around the sprockets 16, 17 and a sprocket 18 provided at the upper part of the main body frame 12.

[0005] The extension and retraction of the inner frame 14 relative to the outer frame 13 is performed by the extension and retraction of the cylinder 21. Furthermore, in order to prevent changes in the tension of the chain 20 due to the extension and retraction of the inner frame 14, the outer frame 13 is connected to a lifting frame 23 that can be raised and lowered relative to the main frame 12 by the extension and retraction of the cylinder 22. In Figure 5, as shown by the solid line, when the cylinder 21 extends and the inner frame 14 extends relative to the outer frame 13, the cylinder 22 extends in conjunction with the operation of the cylinder 21, and the outer frame 13 rises by being pulled towards the main frame 12 via the lifting frame 23. On the other hand, in Figure 5, as shown by the dashed line, when the cylinder 21 contracts and the inner frame 14 shrinks relative to the outer frame 13, the cylinder 22 contracts in conjunction with the operation of the cylinder 21, and the outer frame 13 descends by being moved away from the main frame 12 via the lifting frame 23, thereby maintaining a constant tension in the chain 20.

[0006] In Figure 4, 24 is a balancing lever that is tilted and raised on the top of the slewing frame 5. The main frame 12 of the bucket elevator 8 is attached to the tip of the balancing lever 24 via the top frame 25, and a parallelogram linkage mechanism is formed by the boom 4, the balancing lever 24, the slewing frame 5, and the top frame 25. A rotary feeder 27 is built into the top frame 25. A counterweight 26 is attached to the rear end of the balancing lever 24.

[0007] As the chain 20 rotates, the bulk material 7 inside the cargo hold 6 is scraped up by the buckets 19 of the bucket elevator 8 and transported upward, where it falls onto the rotary feeder 27 and is transferred to the boom conveyor 9. The boom conveyor 9 then transports the boom 4 from the tip end to the base end, and it falls onto the discharge conveyor 10 via the chute 11, where it is discharged to the outside of the traveling frame 3 by the discharge conveyor 10.

[0008] In such continuous unloaders 100, there is a problem in that bulk material 7 adheres to and accumulates on the inside and outside surfaces of the bucket 19 during operation. If the amount of bulk material 7 accumulated in the bucket 19 becomes large, the load on the tip of the boom 4 becomes too large due to its weight, which could make it impossible to continue cargo handling. In addition, if bulk material 7 accumulates inside the bucket 19, the effective volume of the bucket 19 is reduced accordingly, which reduces the efficiency of cargo handling.

[0009] Therefore, when performing cargo handling operations using the continuous unloader 100, it is necessary to periodically clean the bucket 19 before the amount of bulk material 7 accumulated in it becomes too large. However, cleaning requires interrupting cargo handling operations, resulting in wasted port usage fees and other costs, as well as labor costs for the cleaning itself. Moreover, there are issues with treating the wastewater from the cleaning process, which contains debris from the bulk material 7, so overall, cleaning the bucket 19 is very costly.

[0010] On the other hand, while the bucket 19 is cleaned with high-pressure water, if the accumulated bulk material 7 is strongly adhered to the bucket 19, it may not be possible to wash it off completely with just the spray of high-pressure water, and the task of peeling it off by hand by workers was extremely hard work. In particular, the bulk material 7 adhering to the inside of the bucket 19 tends to adhere easily because it is compressed and accumulated under pressure from the scraping action during cargo handling operations.

[0011] Furthermore, in recent years, the use of low-grade coals such as lignite and sub-bituminous coal as fuel has increased in thermal power generation and other applications. However, these low-grade coals have a high water content, and the powdery bulk material 7 tends to turn into a muddy substance that adheres to the bucket 19. Therefore, when unloading low-grade coal, problems such as the load on the tip of the boom 4 and the reduction in the volume of the bucket 19 are particularly likely to occur, and cleaning work has to be performed more frequently.

[0012] To address the shortcomings of these conventional buckets 19, a bucket 28 (see Figure 6) that is less prone to the adhesion of bulk material 7 to its inner surface has already been filed by the present applicant, and this bucket 28 is disclosed in Patent Document 1. [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Japanese Patent Publication No. 2017-81705 [Overview of the project] [Problems that the invention aims to solve]

[0014] However, while buckets 28 such as the one disclosed in Patent Document 1 are excellent in that they fluidize the bulk material 7 inside, research by the present inventors has revealed that because they are made of non-corrosion-resistant steel plates (wear-resistant steel plates, SM material) and used in a painted state, if the paint peels off and rust occurs after long-term use, the bulk material 7 such as coal will adhere to the rusted areas.

[0015] Furthermore, the bucket 28 needed to have a corrosion allowance to account for rust formation, which inevitably led to an increase in weight, leaving room for improvement.

[0016] This invention was made in view of the above-mentioned conventional problems, and aims to provide a bucket for scraping loose materials that can prevent rust formation, suppress the adhesion of loose materials, and also reduce weight. [Means for solving the problem]

[0017] The present invention relates to a bulk material scraping bucket for scraping and transporting bulk material, A curved plate section with an arc shape whose longitudinal cross-section along the scraping direction is convex towards the rear, The top plate portion extends forward from the upper front end of the curved plate portion in the scraping direction, A bottom plate portion that projects forward from the lower front part in the scraping direction of the curved plate portion, a side plate portion that covers the left and right ends of the curved plate portion, the top plate portion, and the bottom plate portion, where the curved plate portion, the top plate portion, the bottom plate portion, and the side plate portion stainless steel are formed and are related to a bucket for scraping debris that is polished by the debris that is scraped and flows.

[0019] In addition, in the bucket for scraping debris, the debris can be coal.

Advantages of the Invention

[0020] According to the bucket for scraping debris of the present invention, it is possible to achieve excellent effects such as preventing the generation of rust, suppressing the adhesion of debris, and reducing the weight.

Brief Description of the Drawings

[0021] [Figure 1] It is an exploded perspective view showing an embodiment of the bucket for scraping debris of the present invention, and is a view showing the state where the bucket moves in the scraping direction. [Figure 2] It is a perspective view showing an embodiment of the bucket for scraping debris of the present invention, and is a view showing the state where the bucket moves upward. [Figure 3] It is a perspective view showing an embodiment of the bucket for scraping debris of the present invention, and is a view showing the state where the bucket moves in the reverse scraping direction. [Figure 4] It is a schematic configuration diagram showing a continuous unloader equipped with a conventional bucket for scraping debris. [Figure 5] It is a detailed view showing a partially enlarged view of FIG. 4. [Figure 6] [[ID=4|0]]It is a side view showing a bucket invented and already applied for by the present inventors.

Modes for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0023] Figures 1 to 3 show embodiments of the bulk material scraping bucket of the present invention, and parts in the figures that are denoted by the same reference numerals as those in Figures 4 to 6 represent the same parts.

[0024] The bucket 28 for scraping and transporting bulk material 7 such as coal in this embodiment comprises a curved plate portion 28A, a top plate portion 28B, a bottom plate portion 28C, and side plate portions 28D. The curved plate portion 28A is an arc-shaped portion whose longitudinal cross-section along the scraping direction is convex towards the rear.

[0025] The top plate portion 28B is the part that protrudes forward from the upper front end of the curved plate portion 28A in the scraping direction.

[0026] The bottom plate portion 28C is the part that protrudes forward from the lower front end of the curved plate portion 28A in the scraping direction.

[0027] The side plate portion 28D is the portion that covers both the left and right ends of the curved plate portion 28A, the top plate portion 28B, and the bottom plate portion 28C.

[0028] The curved plate portion 28A, the top plate portion 28B, the bottom plate portion 28C, and the side plate portion 28D are made of stainless steel. Steel It is formed and polished by loose material 7 that is scraped off and flows.

[0029] Next, the operation of the above embodiment will be explained.

[0030] As shown in Figure 1, the bucket 28 moves in the scraping direction and scrapes up the bulk material 7. However, because it is equipped with an arc-shaped curved plate portion 28A whose longitudinal cross-section along the scraping direction is convex towards the rear, the flow of the bulk material 7 such as coal inside the bucket 28 is promoted, and the bulk material 7 acts like an abrasive, mainly polishing the inner surface of the bottom plate portion 28C, 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, resulting in a mirror-like finish.

[0031] Next, as the bucket 28 changes orientation from the state shown in Figure 1 to the state shown in Figure 2, opening upwards, the bulk material 7 flows down along the inner surface of the curved plate portion 28A, and the inner surface of the curved plate portion 28A and the inner surface of the side plate portion 28D near the curved plate portion 28A are polished and made mirror-like.

[0032] Furthermore, when the bucket 28 changes orientation from the state shown in Figure 2 to the state shown in Figure 3, inverting upside down compared to the state shown in Figure 1, the loose material 7 flows along the inner surface of the curved plate portion 28A, sliding down toward the inner surface of the top plate portion 28B. As a result, 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 and made into a mirror surface.

[0033] In this embodiment, the bulk material 7 is fluidized inside the bucket 28. stainless steel This allows it to function as an abrasive, preventing paint from peeling and rust from forming even after prolonged use, and preventing bulk materials such as coal from adhering to areas where rust occurs.

[0034] Furthermore, the bucket 28 in this embodiment is made of stainless steel. Steel Because no rust forms and rust does not occur, there is no need to allow for corrosion, making it possible to reduce weight. For example, while the conventional bucket 28 weighed 204 kg, the bucket 28 in this embodiment weighs 185 kg, resulting in a weight reduction of approximately 10%.

[0035] Furthermore, in this embodiment, the bucket 28 is stainless steel Although the initial installation cost increases due to this construction, the lifespan is extended, resulting in overall cost reduction. Furthermore, even if bulk materials 7 such as coal adhere to the bucket 28, it becomes easier to remove, making maintenance easier and reducing cleaning costs.

[0036] Furthermore, in this embodiment, the corners where the curved plate portion 28A, the top plate portion 28B, and the side plate portion 28D are joined, as well as the corners where the curved plate portion 28A, the bottom plate portion 28C, and the side plate portion 28D are joined, do not need to be bent into a three-dimensionally rounded shape, which is effective in reducing manufacturing costs.

[0037] Furthermore, the inventors replaced two of the sixty buckets 19 installed in a continuous unloader actually in operation, as shown in Figures 4 and 5, with the buckets 28 of this embodiment, and conducted actual machine tests.

[0038] In the actual machine test, the operating time was set to 22,500 minutes (375 hours), and the adhesion status of the bulk material 7 was visually confirmed, as well as the attached bulk material 7 was collected and weighed.

[0039] Visual inspection revealed that the conventional bucket 19 had a significant amount of bulk material 7 attached to it, whereas the bucket 28 of this embodiment had considerably less bulk material 7 attached to it compared to the conventional bucket 19.

[0040] Furthermore, the recovery and weighing results of the bulk material 7 attached to each bucket 19 and 28 are shown in [Table 1]. [Table 1]

[0041] In other words, it has been demonstrated that, compared to conventional buckets 19, approximately 10 kg of bulk material 7 is less likely to adhere to a single bucket 28, and with 60 buckets 28, the adhesion of approximately 600 kg of bulk material 7 can be suppressed.

[0042] In this way, rust formation can be prevented, the adhesion of loose materials 7 can be suppressed, and weight reduction can also be achieved.

[0043] Furthermore, the bulk material scraping bucket of the present invention is not limited to the embodiments described above. For example, the bucket can be applied not only to continuous unloaders but also to reclaimers and stacker reclaimers. Various modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0044] 1. Quay 2 rails 3. Running frame 4 Boom 5. Swivel Frame 6. Ship's hold 7 Loose items 8 Bucket elevator 9 Boom conveyor 10. Discharge conveyor 11 shots 12 Main frame 13 Outer frame 14 Inner frame 15. Scraping section frame 16 sprocket 17 sprocket 18 sprocket 19 buckets 20 chain 21 Cylinders 22 volts 23 Lifting Frame 24 Balancing Lever 25 Top Frame 26 Counterweights 27 Rotary feeder 28 buckets 28A Curved plate section 28B Top panel 28C Bottom plate part 28D side plate part 100 Continuous Unloader

Claims

1. In a bulk material scraping bucket used to scrape and transport bulk materials, A curved plate section with an arc shape whose longitudinal cross-section along the scraping direction is convex towards the rear, The top plate portion extends forward from the upper front end of the curved plate portion in the scraping direction, The bottom plate portion extends forward from the lower front end of the curved plate portion in the scraping direction, The curved plate portion, the top plate portion, and the bottom plate portion are all comprised of side plates that cover both the left and right ends of the top and bottom plates. A bulk material scraping bucket in which the curved plate section, top plate section, bottom plate section, and side plate section are made of stainless steel and are polished by the bulk material being scraped and flowing.

2. The bulk material is coal, as described in claim 1, for the bulk material scraping bucket.

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