Reclaimer

Abstract

To provide a bucket wheel type reclaimer capable of reducing a raw material left behind.SOLUTION: A reclaimer (100) comprises: a travel body (10); a boom (20); a belt conveyor (30); and a bucket wheel (40). The boom (20) is turnably and elevatably attached to the travel body (10). The boom (20) extends from the travel body (10). The bucket wheel (40) is configured to rotate about a rotation axis (X). The bucket wheel (40) includes a plurality of buckets (42). The buckets (42) are arranged around the rotation axis (X). Each bucket (42) has an opening (424) on one side of the bucket wheel (40) in a circumferential direction. The bucket wheel (40) is attached to the tip (22) of the boom (20) so as to set an angle between the rotation axis (X) and the boom (20) in the longitudinal direction equal or lower than 45° in the upper surface view of the reclaimer (100).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a reclaimer. [Background technology]

[0002] Conventionally, reclaimers have been used to discharge raw materials (bulk materials) such as iron ore and coal from raw material yards. One type of reclaimer known is a bucket wheel reclaimer. A bucket wheel reclaimer includes a running body, a boom, a belt conveyor, and a bucket wheel. The boom is attached to the running body, which runs on rails, so that it can rotate and move up and down. The bucket wheel is attached to the tip of the boom so that it can rotate around a rotation axis. The bucket wheel includes multiple box-shaped scraping portions (buckets). The raw materials excavated and scraped by the bucket in the raw material yard are transferred to a belt conveyor attached to the boom and transported out.

[0003] As disclosed in Patent Document 1, in a typical reclaimer, a bucket wheel is attached to the side of the tip of a boom. In this case, the rotation axis of the bucket wheel is disposed substantially perpendicular to the longitudinal direction of the boom when viewed from above the reclaimer. In the reclaimer of Patent Document 1, the bucket wheel is attached at an angle to the boom to avoid interference between the bucket wheel and the belt conveyor. Also, in the reclaimer of Patent Document 1, each bucket is inclined at a predetermined angle with respect to the center line of the bucket wheel so that the center line of each bucket is perpendicular to the excavation surface.

[0004] On the other hand, Patent Documents 2 and 3 disclose bucket wheel type unloaders. Unlike reclaimers, unloaders transport raw materials loaded on board ships out of ships. As disclosed in Patent Documents 2 and 3, the boom of the unloader includes a horizontal boom and a vertical boom. The horizontal boom extends in a generally horizontal direction from the traveling body. The vertical boom is supported by the tip of the horizontal boom so as to be able to swing freely. When the unloader is in use, the vertical boom extends from the horizontal boom to a position below the traveling body. A bucket wheel is attached to the tip of the vertical boom. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 4-49126 [Patent Document 2] Japanese Patent Application Publication No. 11-139570 [Patent Document 3] Japanese Utility Model Application Publication No. 1-75034 Summary of the Invention [Problem to be solved by the invention]

[0006] For example, a raw material yard in a steelworks generally has a width of about 30 m to 50 m and a length of about 400 m to 700 m. Rails are arranged parallel to the length of the raw material yard, and the reclaimer's traveling body travels on these rails. When discharging raw materials from the raw material yard, the reclaimer rotates the boom back and forth. After one round trip of the boom, the reclaimer lowers the boom by the scraping height of the raw material and then rotates the boom back and forth again. The reclaimer repeats the boom rotation and elevation movements while changing the position of the traveling body on the rail. As a result, the reclaimer discharges raw materials while changing the scraping position so that the cut surface of the pile of raw materials becomes arc-shaped and stepped.

[0007] A retaining wall is usually installed on the opposite side of the reclaimer across the pile of raw materials. As disclosed in Patent Document 1, in the case of a typical bucket wheel-type reclaimer, the boom rotates back and forth, and the bucket wheel is attached to the boom so that the bucket wheel can easily scrape the raw materials in either direction of rotation. That is, the bucket wheel is attached to the boom so that its rotation axis extends substantially perpendicular to the longitudinal direction of the boom when viewed from above the reclaimer. In this case, the bucket wheel cannot reach the corner areas of the raw material yard formed by the retaining wall and the floor (ground) of the raw material yard, resulting in raw materials being left behind near the retaining wall. To remove the leftover raw materials, work is required, such as using a shovel loader to scrape the raw materials and dump them into a hopper or dump truck, and then transporting them out of the raw material yard.

[0008] For example, if the mixing of raw material brands is strictly restricted, it is necessary to ensure that no previous brand of raw material is left behind before the next brand of raw material is piled up in the raw material yard. Reclaimers with horizontal retractable cranes (LLC) and scraper-type reclaimers are known as reclaimers that leave relatively little raw material behind. However, horizontal retractable crane reclaimers require an operator to operate them at all times, making it difficult to automate the discharge of raw materials. In scraper-type reclaimers, it is preferable that the belt conveyor be located below the floor of the raw material yard. Placing the belt conveyor below the floor of the raw material yard requires significant modifications to the floor of the raw material yard, which requires a significant capital investment.

[0009] The present disclosure provides a bucket wheel type reclaimer that can reduce leftover material. [Means for solving the problem]

[0010] The reclaimer according to the present disclosure comprises a running body, a boom, a belt conveyor, and a bucket wheel. The boom is attached to the running body so as to be able to rotate and raise and lower. The boom extends from the running body. The belt conveyor is provided on the boom. The bucket wheel is configured to rotate around a rotation axis. The bucket wheel includes a plurality of buckets. The buckets are arranged around the rotation axis. Each bucket has an opening on one circumferential side of the bucket wheel. The bucket wheel is attached to the tip of the boom so that the angle between the rotation axis and the longitudinal direction of the boom is 45° or less when viewed from above the reclaimer. [Effects of the Invention]

[0011] The bucket wheel reclaimer according to the present disclosure can reduce the amount of leftover raw material. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a reclaimer according to the first embodiment. [Figure 2] FIG. 2 is a top view of the reclaimer according to the first embodiment, showing an enlarged view of the tip of the boom and its vicinity. [Figure 3] FIG. 3 is a side view of the reclaimer according to the first embodiment, showing an enlarged view of the tip of the boom and its vicinity. [Figure 4] FIG. 4 is a diagram showing the relationship between the bucket wheel of a conventional reclaimer, the retaining wall of the raw material yard, and the floor surface of the raw material yard. [Figure 5] FIG. 5 is a diagram showing the relationship between the bucket wheel of the reclaimer according to the first embodiment, the retaining wall of the raw material yard, and the floor surface of the raw material yard. [Figure 6] FIG. 6 is a top view of the reclaimer according to the second embodiment, showing an enlarged view of the tip of the boom and its vicinity. [Figure 7] FIG. 7 is a side view of a reclaimer according to a third embodiment, showing an enlarged view of the tip of a boom and its vicinity. [Figure 8] FIG. 8 is a side view of the reclaimer according to the third embodiment, and is another enlarged view showing the tip of the boom and its vicinity. [Figure 9] FIG. 9 is a side view of a reclaimer according to a fourth embodiment, showing an enlarged view of the tip of a boom and its vicinity. DETAILED DESCRIPTION OF THE INVENTION

[0013] The reclaimer according to the embodiment comprises a traveling body, a boom, a belt conveyor, and a bucket wheel. The boom is attached to the traveling body so that it can rotate and move up and down. The boom extends from the traveling body. The belt conveyor is provided on the boom. The bucket wheel is configured to rotate around a rotation axis. The bucket wheel includes a plurality of buckets. The buckets are arranged around the rotation axis. Each bucket has an opening on one circumferential side of the bucket wheel. The bucket wheel is attached to the tip of the boom so that the angle between the rotation axis and the longitudinal direction of the boom is 45° or less when viewed from above the reclaimer (first configuration).

[0014] In a conventional reclaimer, the rotation axis of the bucket wheel extends substantially perpendicular to the longitudinal direction of the boom when viewed from above. In this case, the circumferential surface of the bucket wheel faces the retaining wall. On the other hand, in a reclaimer according to the first configuration, the bucket wheel is attached to the tip of the boom so that the angle between the rotation axis and the longitudinal direction of the boom is 45° or less when viewed from above. In this case, the front surface of the bucket wheel (the surface perpendicular to the rotation axis) faces the retaining wall. This makes it less likely that gaps will occur between the bucket wheel, the retaining wall, and the floor of the raw material yard compared to a conventional reclaimer, and the bucket wheel can easily scrape out raw material even in the corner area of ​​the raw material yard formed by the retaining wall and the floor. This makes it possible to reduce the amount of raw material left behind near the retaining wall.

[0015] In the reclaimer according to the first configuration, the rotation axis of the bucket wheel may be parallel to the longitudinal direction of the boom when viewed from above the reclaimer (second configuration).

[0016] In the second configuration, the rotation axis of the bucket wheel is parallel to the longitudinal direction of the boom when viewed from above the reclaimer. In this case, the bucket wheel can be parallel or nearly parallel to the retaining wall. This makes it less likely that gaps will form between the bucket wheel, the retaining wall, and the floor of the raw material yard, making it easier for the bucket wheel to scrape out raw material from corner areas of the raw material yard formed by the retaining wall and the floor. This further reduces the amount of raw material left behind near the retaining wall.

[0017] In the reclaimer according to the first or second configuration, the rotation axis of the bucket wheel may be inclined relative to the boom so that the opposite side of the boom is positioned above the boom side (third configuration).

[0018] In the third configuration, the rotation axis of the bucket wheel is inclined relative to the boom so that the side opposite the boom is positioned higher than the boom side. This allows the bucket wheel to be inclined relative to the vertical so that the lower side of the bucket wheel is positioned further forward than the upper side when the boom is at its lowest height, for example. In this case, for example, the drive unit provided in the center of the bucket wheel can be separated from the retaining wall, making it less likely for the two to interfere with each other, and the bucket wheel can scrape out raw materials from the corner area of ​​the raw material yard formed by the retaining wall and the floor of the raw material yard.

[0019] In the third configuration, the opposite side of the boom is positioned higher on the rotation axis, causing the bucket wheel to tilt toward the boom, which makes it easier to guide the material from the bucket wheel onto the belt conveyor.

[0020] In the reclaimer according to the third configuration, each of the buckets, when positioned at the lowest position among the plurality of buckets, may be inclined with respect to the rotation axis so that the lower edge of the opening moves away from the rotation axis as it moves forward in a side view of the bucket wheel (fourth configuration).

[0021] When the bucket wheel is attached to the tip of the boom with the rotation axis tilted relative to the boom, if the lower edge of the opening of the lowest bucket among the buckets is parallel to the rotation axis, the lower edge of the opening of the bucket will be non-parallel to the floor of the raw material yard when the boom is at its lowest height. In other words, the gap between the lower edge of the opening of the bucket and the floor of the raw material yard will widen toward the front of the bucket wheel. In contrast, in the fourth configuration, when the bucket is at the lowest position among the buckets, the lower edge of the opening of the bucket is tilted relative to the rotation axis in a side view of the bucket wheel so that it moves away from the rotation axis as it moves forward. In this case, when the boom is at its lowest height, the lower edge of the opening of the bucket can be made nearly parallel to the floor of the raw material yard. This makes it easier to bring the lower edges of the openings of each bucket closer to the floor of the raw material yard, making it easier for each bucket to scrape the raw material from the floor. This reduces the amount of raw material left behind on the floor of the raw material yard.

[0022] In the reclaimer according to any one of the first to fourth configurations, the bucket wheel may be attached to the boom so as to be rotatable left and right (fifth configuration).

[0023] In the fifth configuration, the bucket wheel can rotate left and right relative to the boom, allowing the position of the bucket wheel relative to the boom to be changed depending on the use state of the reclaimer. For example, when the boom rotates at a position away from the retaining wall, the bucket wheel can be positioned so that the rotation axis of the bucket wheel extends substantially or approximately perpendicular to the longitudinal direction of the boom when viewed from above the reclaimer. In this case, as in the conventional case, the bucket wheel is positioned vertically relative to the cutting surface of the pile of raw material, so the bucket wheel can discharge the same amount of raw material regardless of whether the boom rotates left or right. Furthermore, by using the reclaimer in the same manner as in the conventional case, conventional control software can be reused.

[0024] On the other hand, near the retaining wall, the bucket wheel can be positioned so that its rotation axis forms an angle of 45° or less with the longitudinal direction of the boom when viewed from above the reclaimer. This allows the bucket wheel to scrape away material near the retaining wall, reducing the amount of material left behind.

[0025] The reclaimer according to any one of the first to fifth configurations may further include a rope-like member. The rope-like member is attached to the tip of the boom so as to hang down from the tip. The rope-like member may be configured to be rotatable about an attachment axis relative to the tip of the boom (sixth configuration).

[0026] In a bucket wheel reclaimer, a gap is provided between the bucket wheel and the floor at the lowest height of the boom so that the bucket wheel does not interfere with the floor of the raw material yard. In this case, the bucket wheel may not be able to completely scrape off the raw material on the floor of the raw material yard, and some raw material may be left behind on the floor. In contrast, in the sixth configuration, a rope-like member is rotatably attached to the tip of the boom. By rotating this rope-like member about its attachment axis, raw material on the floor of the raw material yard can be removed. More specifically, by rotating the rope-like member while keeping a portion of the rope-like member in contact with the floor of the raw material yard, the raw material left behind by the bucket wheel can be thrown off and accumulated in a location where the bucket wheel can excavate, for example.

[0027] The rope-like member hangs down from the tip of the boom under its own weight, so that during normal unloading, the rope-like member is placed, for example, on the cutting surface of the pile of raw material so as not to interfere with unloading.

[0028] In the reclaimer according to the sixth configuration, the rope-like member may be configured so that a tip end of the rope-like member passes in front of the bucket wheel when rotating (seventh configuration).

[0029] In the seventh configuration, the rope-like member rotates around the mounting axis so that its tip passes in front of the bucket wheel. This allows the rope-like member to remove any material left behind by the bucket wheel, for example, near a retaining wall. Because the rope-like member can elastically deform when it comes into contact with the retaining wall, it is easier to move it closer to the wall than the bucket wheel. This more reliably reduces the amount of material left behind near the retaining wall.

[0030] The reclaimer according to any one of the first to fifth configurations may further include an endless carrier and a plurality of scrapers. The carrier is disposed, for example, below the tip of the boom. In this case, the carrier is configured to be rotated with the upper side as the return side and the lower side as the carrier side. The plurality of scrapers may be arranged along the rotation direction of the carrier and supported by the carrier. The carrier is preferably configured on the carrier side to move the scrapers suspended from the carrier toward the tip of the boom (eighth configuration).

[0031] In the eighth configuration, an endless carrier is placed below the tip of the boom. The upper side of this carrier is the return side and the lower side is the carrier side, and a scraper on the carrier side moves toward the tip of the boom. The scrapers scrape the raw material on the floor toward the tip of the boom, and it accumulates in a position where it can be excavated by a bucket wheel, for example. As a result, the amount of raw material left behind on the floor can be reduced.

[0032] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or equivalent components are designated by the same reference numerals, and the same description will not be repeated.

[0033] First Embodiment [Overall configuration] Fig. 1 is a diagram showing a schematic configuration of a reclaimer 100 according to this embodiment. The reclaimer 100 is used to discharge raw materials (bulk materials) such as iron ore and coal from a raw material yard provided in, for example, a steelworks. The reclaimer 100 is a bucket wheel type reclaimer.

[0034] Referring to FIG. 1, a reclaimer 100 includes a traveling body 10, a boom 20, a belt conveyor 30, a bucket wheel 40, and a chute 50.

[0035] A rail (not shown) is provided on the floor F of the raw material yard. The traveling body 10 travels on the rail.

[0036] The boom 20 extends from the running body 10. The boom 20 extends substantially linearly from the running body 10. The boom 20 is attached to the running body 10 so that it can be rotated and raised or lowered. That is, the boom 20 can rotate left and right around its base end 21. The boom 20 can also rotate up and down around its base end 21.

[0037] The belt conveyor 30 is provided on the boom 20. In the example of FIG. 1, the belt conveyor 30 is arranged inside the boom 20. The belt conveyor 30 includes an endless conveyor belt 31 and pulleys 32 and 33. The pulley 32 is arranged on the base end 21 side of the boom 20, and the pulley 33 is arranged on the tip end 22 side of the boom 20. The conveyor belt 31 is wound around the pulleys 32 and 33. The conveyor belt 31 extends along the longitudinal direction of the boom 20 between the pulleys 32 and 33.

[0038] The bucket wheel 40 and chute 50 are provided at the tip 22 of the boom 20. The bucket wheel 40 scrapes raw materials from a pile (not shown) in the raw material yard. The boom 20 is provided with a chute 50. The raw materials are introduced from the bucket wheel 40 into the chute 50 and guided onto the conveyor belt 31. The belt conveyor 30 transports the raw materials toward the traveling body 10.

[0039] Fig. 2 is a top view of the reclaimer 100, showing an enlarged view of the tip 22 of the boom 20 and its vicinity. Fig. 3 is a side view of the reclaimer 100, showing an enlarged view of the tip 22 of the boom 20 and its vicinity. The side view of the reclaimer 100 refers to a view of the reclaimer 100 as seen from the side of the boom 20 extending from the traveling body 10, regardless of the rotation and elevation state of the boom 20 relative to the traveling body 10.

[0040] 2, the bucket wheel 40 is configured to rotate around a rotation axis X. A rotational driving force is applied to the bucket wheel 40 by a drive unit 41. The drive unit 41 is disposed, for example, in the center of the bucket wheel 40, which has a substantially circular shape as a whole.

[0041] The bucket wheel 40 is attached to the tip 22 of the boom 20 so that the angle between the rotation axis X and the longitudinal direction of the boom 20 is 45° or less when viewed from above the reclaimer 100. As in the example of Figure 2, the rotation axis X is preferably substantially parallel to the longitudinal direction of the boom 20 when viewed from above the reclaimer 100.

[0042] In this embodiment, the bucket wheel 40 is disposed on the tip surface of the boom 20. With reference to Figures 2 and 3, the rotation axis X of the bucket wheel 40 is inclined with respect to the boom 20 so that the opposite side of the boom 20 is positioned above the boom 20 side. Hereinafter, the bucket wheel 40 may be described with the opposite side of the boom 20 as the front and the boom 20 side as the rear.

[0043] 3, the bucket wheel 40 is inclined with respect to the boom 20 so that its lower end is positioned forward of its upper end in a side view. That is, the bucket wheel 40 is inclined toward the boom 20 so that its rear surface approaches the upper surface of the boom 20. When the boom 20 is positioned at its lowest height, the angle between a plane perpendicular to the rotation axis X and the vertical plane is, for example, 10° or more and 40° or less. The upper and lower height limits of the boom 20 are determined in advance by the settings of the reclaimer 100.

[0044] 2 and 3, the bucket wheel 40 includes a plurality of buckets 42. The buckets 42 are arranged around a rotation axis X. Each of the buckets 42 is configured to be able to scrape material from a material yard.

[0045] As shown in Fig. 3, each of the buckets 42 has a box shape. Each of the buckets 42 includes side plates 421, 422 and a bottom plate 423. The side plates 421, 422 are arranged to face each other in the thickness direction of the bucket wheel 40. The bottom plate 423 connects the side plates 421, 422 to each other on the outer circumferential side of the bucket wheel 40. An opening 424 is defined by the side plates 421, 422 and the bottom plate 423. Each of the buckets 42 has this opening 424 on one side in the circumferential direction of the bucket wheel 40.

[0046] A cover plate (not shown), which is a non-rotating body, is provided on the bucket wheel 40. The cover plate extends in the circumferential direction of the bucket wheel 40 and closes the space between the side plates 421, 422 from the inner periphery of the bucket wheel 40 to prevent the raw materials from falling out of each bucket 42. After scraping out the raw materials, the bucket 42 moves upward as the bucket wheel 40 rotates, and drops the raw materials into the chute 50 at the position where the cover plate ends.

[0047] In this embodiment, the rotation axis X of the bucket wheel 40 is inclined with respect to the boom 20, so that the bucket 42 located at the bottom of the bucket wheel 40 is disposed forward of the bucket 42 located at the top. It is preferable that the drive unit 41 does not protrude forward of the bucket 42 located at the bottom.

[0048] Each bucket 42 is configured such that, when positioned at the lowest position among the plurality of buckets 42, the lower edge 424a of its opening 424 is inclined with respect to the rotation axis X. More specifically, in a side view of the bucket wheel 40, the lower edge 424a of the opening 424 of the bucket 42 positioned at the lowest position is inclined with respect to the rotation axis X so as to move away from the rotation axis X as it moves forward. With the boom 20 positioned at the lowest height, each bucket 42 is preferably configured such that the lower edge 424a of its opening 424 is substantially parallel to the floor surface F of the raw material yard when positioned at the lowest position.

[0049] The bucket 42 located at the bottom is the bucket 42 located lowest among the multiple buckets 42 when the upper surface side of the boom 20 is considered to be the top and the lower surface side of the boom 20 is considered to be the bottom with respect to the bucket wheel 40. When the boom 20 is at its lowest height, the bucket 42 located at the bottom is the bucket 42 that is closest to the floor F of the raw material yard among the multiple buckets 42. However, the bucket 42 located at the bottom does not come into contact with the floor F of the raw material yard. The lower edge 424a of the opening 424 is the open edge of the bottom plate 423 and is part of the digging blade of the bucket 42.

[0050] [effect] The reclaimer 100 according to this embodiment can reduce the amount of raw material left behind. This will be specifically described below with reference to FIGS.

[0051] FIG. 4 is a diagram showing the relationship between a bucket wheel 40 in a conventional bucket wheel reclaimer, a retaining wall W of a raw material yard, and the floor F of the raw material yard. In a conventional bucket wheel reclaimer, the bucket wheel 40 is disposed on the side of a boom (not shown), and the rotation axis X is substantially perpendicular to the longitudinal direction of the boom when viewed from above the reclaimer. In this case, as shown in FIG. 4, the circumferential surface of the bucket wheel 40 faces the retaining wall W, and a gap A is formed between the bucket wheel 40, the retaining wall W, and the floor F. Because the bucket wheel 40 rotates along the rotation trajectory indicated by the two-dot chain line in FIG. 4, it cannot reach the gap A, and raw material is left behind in the corner area between the retaining wall W and the floor F.

[0052] 5 shows the relationship between the bucket wheel 40, the retaining wall W of the raw material yard, and the floor surface F of the raw material yard in the reclaimer 100 according to this embodiment. In the reclaimer 100 according to this embodiment, the bucket wheel 40 is disposed on the tip surface of the boom 20, and the rotation axis X extends in the longitudinal direction of the boom 20 when viewed from above the reclaimer 100 (FIG. 2). In this case, as shown in FIG. 5, the front surface of the bucket wheel 40 faces the retaining wall W, and the bucket wheel 40 can be moved closer to the retaining wall W compared to the state shown in FIG. 4. Therefore, the gap A formed between the bucket wheel 40, the retaining wall W, and the floor surface F is smaller, and it is possible to reduce the amount of raw material left behind near the retaining wall W.

[0053] However, the rotation axis X of the bucket wheel 40 may be inclined at an angle of 45° or less with respect to the longitudinal direction of the boom 20 when viewed from above the reclaimer 100. Even in this case, the front surface of the bucket wheel 40 faces the retaining wall W, so the bucket wheel 40 can be brought closer to the retaining wall W compared to the state shown in FIG. 4. Therefore, it is possible to reduce the amount of raw material left behind by the bucket wheel 40 near the retaining wall W.

[0054] In the reclaimer 100 according to this embodiment, the rotation axis X of the bucket wheel 40 is inclined relative to the boom 20 so that the opposite side (front side) of the boom 20 is positioned above the boom 20 side (rear side). That is, the bucket wheel 40 is inclined relative to the boom 20 so that the lower end is positioned forward of the upper end in a side view. In this case, when scraping off raw material near the retaining wall W, the drive unit 41 of the bucket wheel 40 can be separated from the retaining wall W, making it less likely to interfere with the retaining wall W.

[0055] In the reclaimer 100 according to this embodiment, the front side of the rotation axis X is positioned higher than the rear side, so that the upper end side of the bucket wheel 40 is tilted toward the boom 20 so that it approaches the upper surface of the boom 20. This makes it easier to guide the raw material from the bucket wheel 40 to the belt conveyor 30. More specifically, it becomes easier to feed the raw material from each bucket 42 into the chute 50 at the upper end side of the bucket wheel 40, and the raw material can be guided to the belt conveyor 30 by the chute 50.

[0056] In the reclaimer 100 according to this embodiment, the rotation axis X of the bucket wheel 40 is inclined relative to the boom 20, and the lower edge 424a of the opening 424 of each bucket 42 is inclined relative to the rotation axis X. More specifically, in the bucket 42 located at the lowest position, the lower edge 424a of the opening 424 is inclined relative to the rotation axis X so as to move away from the rotation axis X toward the front of the bucket wheel 40, as viewed from the side of the bucket wheel 40. In this case, the lower edge 424a of the opening 424 of the bucket 42 is more likely to be nearly parallel to the floor surface F of the raw material yard, compared to when the lower edge 424a is parallel to the rotation axis X of the bucket wheel 40. This makes it easier for the lower edge 424a of the opening 424 of each bucket 42 to be generally close to the floor surface F of the raw material yard, making it easier for each bucket 42 to scrape raw material off the floor surface F. This reduces the amount of raw material left behind on the floor surface F of the raw material yard. It is particularly preferred that each bucket 42 is configured so that when the boom 20 is at its lowest position, the lower edge 424a of the opening 424 is substantially parallel to the floor surface F of the raw material yard.

[0057] However, the bucket wheel 40 may be attached to the boom 20 so that the rotation axis X is substantially parallel to the boom 20 in a side view. In this case, it is preferable that the lower edge 424a of the opening 424 of each bucket 42 is substantially parallel to the rotation axis X in a side view of the bucket wheel 40.

[0058] Second Embodiment 6 is a top view of the reclaimer 100A according to this embodiment, showing an enlarged view of the tip 22 of the boom 20 and its vicinity. The reclaimer 100A according to this embodiment has basically the same configuration as the reclaimer 100 according to the first embodiment, but differs from the first embodiment in that the bucket wheel 40 is movable.

[0059] Referring to Fig. 6, the bucket wheel 40 is attached to the boom 20 so as to be able to swing left and right. The bucket wheel 40 swings around the tip 22 of the boom 20 in a top view of the reclaimer 100A. More specifically, the bucket wheel 40 can move from a position on the tip surface of the boom 20 as indicated by a two-dot chain line in Fig. 6 to a position on one side surface of the boom 20 as indicated by a solid line in Fig. 6. Similarly, the bucket wheel 40 can move from a position on the tip surface of the boom 20 to a position on the other side surface of the boom 20 (not shown).

[0060] When the bucket wheel 40 is located on the tip surface of the boom 20, the rotation axis X extends in the longitudinal direction of the boom 20 in a top view of the reclaimer 100A. On the other hand, when the bucket wheel 40 rotates left from the tip surface of the boom 20, the rotation axis X extends in a direction intersecting the longitudinal direction of the boom 20 in a top view of the reclaimer 100A. Furthermore, when the bucket wheel 40 rotates right from the tip surface of the boom 20, the rotation axis X extends in a direction intersecting the longitudinal direction of the boom 20 in a top view of the reclaimer 100A. When the bucket wheel 40 is located on either side of the boom 20, the rotation axis X extends in a direction substantially perpendicular to the longitudinal direction of the boom 20 in a top view of the reclaimer 100A. In this way, in this embodiment, the direction in which the rotation axis X of the bucket wheel 40 extends in a top view of the reclaimer 100A changes.

[0061] As in the first embodiment, the chute 50 has the function of guiding the raw materials from the bucket wheel 40 to the belt conveyor 30. The chute 50 is disposed in a position where the bucket wheel 40 can input the raw materials, regardless of the position of the bucket wheel 40. The bucket wheel 40 is configured to move along the periphery of the chute 50 when viewed from above the reclaimer 100A.

[0062] It is preferable that the upper edge of the chute 50, at least the range through which the bucket wheel 40 rotates to introduce the raw material onto the belt conveyor 30, be substantially arc-shaped when viewed from above the reclaimer 100A. The portion below the upper edge of the chute 50 does not necessarily have to be arc-shaped and may have any other shape. The portion below the upper edge of the chute 50 only needs to be able to guide the raw material onto the belt conveyor 30, and may be connected to, for example, a skirt provided on the belt conveyor 30. When the bucket wheel 40 rotates as in this embodiment, an auxiliary chute 60 can be provided in addition to the chute 50. The auxiliary chute 60 may be configured to rotate left and right around the tip 22 of the boom 20 following the bucket wheel 40. In this case, the chute 50 is positioned on the belt conveyor 30 side relative to the auxiliary chute 60. The raw material from the bucket wheel 40 may be introduced into the chute 50 via the auxiliary chute 60 and then guided to the belt conveyor 30.

[0063] In the reclaimer 100A according to this embodiment, the bucket wheel 40 is attached to the boom 20 so that it can swing left and right. Therefore, the position of the bucket wheel 40 relative to the boom 20 can be changed depending on the usage state of the reclaimer 100A. For example, when the boom 20 swings away from the retaining wall W (FIG. 5), the bucket wheel 40 can be positioned so that the rotation axis X of the bucket wheel 40 extends substantially or approximately perpendicular to the longitudinal direction of the boom 20 when viewed from above the reclaimer 100A. In this case, as in the conventional case, the bucket wheel 40 is positioned vertically relative to the cut surface of the pile of raw material. Therefore, whether the boom 20 swings left or right, the bucket wheel 40 can discharge the same amount of raw material. Furthermore, by using the reclaimer 100A in the same manner as in the conventional case, changes to the control software can be reduced.

[0064] Meanwhile, near the retaining wall W (FIG. 5), similar to the first embodiment, the bucket wheel 40 can be arranged so that the angle between the rotation axis X of the bucket wheel 40 and the longitudinal direction of the boom 20 is 45° or less when viewed from above the reclaimer 100A. Near the retaining wall W, it is preferable that the rotation axis X of the bucket wheel 40 is substantially parallel to the longitudinal direction of the boom 20 when viewed from above the reclaimer 100A. Therefore, similar to the first embodiment, it is possible to reduce the amount of raw material left behind near the retaining wall W.

[0065] In the first embodiment, the bucket wheel 40 is fixed to the boom 20, and its rotation axis X always forms an angle of 45° or less with the longitudinal direction of the boom 20 when viewed from above the reclaimer 100A. However, as in this embodiment, the rotation axis X of the bucket wheel 40 does not always have to form an angle of 45° or less with the longitudinal direction of the boom 20 when viewed from above the reclaimer 100A. In at least one usage mode, it is sufficient that the angle formed between the rotation axis X of the bucket wheel 40 and the longitudinal direction of the boom 20 is 45° or less when viewed from above the reclaimer 100A. In at least one usage mode, the rotation axis X of the bucket wheel 40 may be substantially parallel to the longitudinal direction of the boom 20 when viewed from above the reclaimer 100A.

[0066] <Third embodiment> 7 is a side view of a reclaimer 100B according to this embodiment, showing an enlarged view of the tip 22 of the boom 20 and its vicinity. The reclaimer 100B according to this embodiment differs from the other reclaimers 100 and 100A in that it further includes at least one rope-like member 70.

[0067] 7, a reclaimer 100B according to this embodiment includes a plurality of rope-like members 70. Each of the rope-like members 70 is attached to the tip portion 22 of the boom 20 so as to hang down from the tip portion 22. The rope-like members 70 are attached to the tip portion 22 behind the bucket wheel 40. The rope-like members 70 are attached to the tip portion 22 of the boom 20 via attachment members 80.

[0068] Each rope-like member 70 includes a member body 71 and a weight 72. The member body 71 is flexible. The member body 71 is formed of one or more linear members so as to be elastically deformable. The linear members are, for example, wire ropes. That is, the member body 71 may be formed of one or more wire ropes. A wire rope is configured by twisting together multiple wires. However, the linear member does not necessarily have to be twisted together like a wire rope, which is made of multiple wires or multiple fibers. The linear member may be, for example, a chain. The weight 72 is attached to the tip of the member body 71. The weight 72 is, for example, cylindrical. In this case, the tip of the member body 71 is inserted into the weight 72. The weight 72 is formed of a metal such as iron. The weight of the weight 72 allows the rope-like member 70 to hang vertically downward.

[0069] Each rope-like member 70 is configured to be rotatable about an attachment axis Y with respect to the tip 22 of the boom 20. The attachment axis Y is an axis that extends, for example, in a substantially vertical direction at the lowest height of the boom 20. A rotational driving force is applied to the rope-like members 70 by attachment members 80.

[0070] The mounting member 80 includes, for example, a shaft member 81, a bearing 82, and a case 83. The shaft member 81 is supported by the case 83 via the bearing 82 so as to be rotatable about its central axis. The central axis of the shaft member 81 is the mounting axis Y. The shaft member 81 rotates about its mounting axis Y by a motor (not shown). The base ends of each rope-like member 70 are fixed to the shaft member 81 by, for example, a pin. As the shaft member 81 rotates, each of the rope-like members 70 rotates about the mounting axis Y. The rotational orbit of the rope-like member 70 becomes larger as the rotational speed increases.

[0071] Furthermore, the shaft member 81 is supported via bearings 82 so as to be movable up and down relative to the case 83. Therefore, for example, when the shaft member 81 comes into contact with the floor surface F of the raw material yard, the shaft member 81 moves upward relative to the case 83.

[0072] The reclaimer 100B according to this embodiment can reduce the amount of raw material left behind on the floor surface F. Specifically, for example, when excavating raw material in a raw material yard, if the bucket wheel 40 sinks due to the resistance of the raw material and comes into contact with the floor surface F, the floor surface F may be damaged or the balance of the reclaimer itself may be lost. For this reason, an electrical limiter may be provided in the reclaimer so that the bucket 42 located at the lowest position in the bucket wheel 40 is positioned, for example, about 300 mm above the floor surface F. In this case, raw material remaining in the gap between the bucket wheel 40 and the floor surface F will remain on the floor surface F.

[0073] In contrast, in the reclaimer 100B according to this embodiment, the rope-like member 70 is rotatably attached to the tip 22 of the boom 20. As shown in Fig. 8, by rotating the rope-like member 70 about the attachment axis Y while the tip of the rope-like member 70 is in contact with the floor surface F of the raw material yard, the raw materials on the floor surface F can be bounced off and accumulated at a predetermined position. For example, after the pile of raw materials has been excavated to the lower limit height of the boom 20, the boom 20 can be turned while rotating the rope-like member 70 about the attachment axis Y, thereby accumulating the raw materials on the floor surface F at the next excavation position.

[0074] The rotation direction of the rope-like member 70 may be changed depending on the position in the raw material yard. For example, the swing direction of the boom 20 may be opposite on one side of the rail to prevent the rope-like member 70 from throwing the raw materials toward the rail. Because the relationship between the swing direction of the boom 20 and the rotation direction of the bucket wheel 40 differs on one side of the rail and the other side, the amount of material discharged by the bucket wheel 40 may differ even if the rotation speed of the bucket wheel 40 is the same. Therefore, the rotation speed of the bucket wheel 40 may be controlled on each side of the rail based on the weight value of the raw materials being carried onto the belt conveyor 30.

[0075] Each of the rope-like members 70 may be configured so that its tip passes in front of the bucket wheel 40 when it rotates. More specifically, the rotational path of the rope-like members 70 may extend forward of the lowest bucket 42 of the bucket wheel 40. This allows, for example, even if there is material left behind by the bucket wheel 40 near a retaining wall, the material can be removed by the rotating rope-like members 70. The rope-like members 70 can elastically deform when they come into contact with the retaining wall, and can be brought closer to the wall than the bucket wheel 40. This makes it possible to more reliably reduce the amount of material left behind near the retaining wall.

[0076] The rope-like member 70 hangs down by its own weight from the tip 22 of the boom 20. Therefore, during normal unloading, the rope-like member 70 can be placed, for example, on the cutting surface of the pile of raw material so as not to interfere with unloading.

[0077] The reclaimer 100B according to this embodiment is provided with a plurality of rope-like members 70. For example, from the viewpoint of suppressing vibration of the mounting member 80, it is preferable that the rope-like members 70 are evenly arranged around the shaft member 81. However, the reclaimer 100B may be provided with a single rope-like member 70.

[0078] <Fourth embodiment> 9 is a side view of a reclaimer 100C according to this embodiment, showing an enlarged view of the tip 22 of the boom 20 and its vicinity. The reclaimer 100C according to this embodiment differs from the reclaimers 100, 100A, and 100B according to the other embodiments in that it is equipped with an endless conveying body 91 and a plurality of scrapers 92.

[0079] Referring to FIG. 9, an endless carrier 91 is disposed below the tip 22 of the boom 20. The carrier 91 is disposed rearward relative to the bucket wheel 40. The carrier 91 is wound around at least two pulleys 93, 94. One of the pulleys 93, 94 is a drive pulley, and the other of the pulleys 93, 94 is a driven pulley. The pulleys 93, 94 are attached, for example, to the underside of the boom 20. The pulley 93 is disposed closer to the tip of the boom 20 than the pulley 94. The pulley 94 on the traveling body 10 (FIG. 1) side may be configured to be movable along the longitudinal direction of the boom 20.

[0080] The conveying body 91 is configured to be rotated with its lower side designated as the carrier side C and its upper side designated as the return side R. The conveying body 91 rotates around the pulleys 93 and 94 as the drive pulley of the pulleys 93 and 94 rotates around its central axis. The conveying body 91 is not particularly limited as long as it is an endless annular body. The conveying body 91 may be a single-strand or multiple-strand annular chain, or may be an annular belt.

[0081] Each of the scrapers 92 has a plate shape. The scrapers 92 are arranged along the rotation direction of the conveying body 91. The scrapers 92 may be arranged at equal intervals along the rotation direction of the conveying body 91. The scrapers 92 are supported by the conveying body 91. Each of the scrapers 92 is attached to the conveying body 91 so that at least a portion of it protrudes toward the outer periphery of the conveying body 91. The scrapers 92 may be made of a metal such as iron. The scrapers 92 are preferably made of a highly wear-resistant material.

[0082] The scraper 92 rotates together with the carrier 91. More specifically, the carrier 91 transports the scraper 92 suspended from the carrier 91 on the carrier side C toward the tip of the boom 20. When the carrier 91 is driven, the carrier side C of the carrier 91 is bent downward. The scraper 92 located on the carrier side C of the carrier 91 can scrape the raw materials on the floor F toward the tip of the boom 20 while contacting the floor F of the raw material yard. The raw materials are accumulated, for example, at a position where the bucket wheel 40 can excavate them.

[0083] The raw material scraped by the scraper 92 is scraped off by the bucket wheel 40. This makes it possible to reduce the amount of raw material left on the floor surface F.

[0084] As shown by the two-dot chain line in Figure 9, when the conveying body 91 is not driven, the pulley 94 may be moved toward the traveling body 10 (Figure 1) in the longitudinal direction of the boom 20. This makes it possible to eliminate deflection of the carrier side C of the conveying body 91. As a result, the conveying body 91 and the scraper 92 are less likely to interfere with the pile of raw material during normal unloading operations.

[0085] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present disclosure. [Explanation of symbols]

[0086] 100, 100A, 100B, 100C: Reclaimer 10: Running body 20: Boom 22:Tip 30: Belt conveyor 40: Bucket wheel 42: Bucket 424: Opening 424a: Lower edge 70: Rope-like member 91: Transporter 92: Scraper

Claims

1. A reclaimer, A running body, a boom attached to the traveling body so as to be able to rotate and elevate, and extending from the traveling body; a belt conveyor provided on the boom; a bucket wheel configured to rotate about a rotational axis, the bucket wheel including a plurality of buckets arranged around the rotational axis, each bucket having an opening on one circumferential side of the bucket wheel; Equipped with a bucket wheel attached to the tip of the boom so that an angle formed between the rotation axis and a longitudinal direction of the boom is 45° or less when viewed from above the reclaimer.

2. 2. The reclaimer of claim 1, The reclaimer, wherein the rotation axis is parallel to the longitudinal direction when viewed from above the reclaimer.

3. 2. The reclaimer of claim 1, The reclaimer, wherein the axis of rotation is tilted relative to the boom such that the opposite side of the boom is positioned above the boom side.

4. 4. The reclaimer of claim 3, when each of the buckets is positioned at the lowest position among the plurality of buckets, the buckets are inclined with respect to the rotation axis such that a lower edge of the opening moves away from the rotation axis as it moves forward in a side view of the bucket wheel.

5. 2. The reclaimer of claim 1, The bucket wheel is attached to the boom so as to be able to turn left and right.

6. 6. The reclaimer of claim 1, further comprising: A reclaimer comprising a rope-like member attached to the tip portion so as to hang down from the tip portion and configured to be rotatable about an attachment axis relative to the tip portion.

7. 7. The reclaimer of claim 6, The reclaimer is configured such that a tip of the rope-like member passes in front of the bucket wheel when the rope-like member rotates.

8. 6. The reclaimer of claim 1, further comprising: an endless conveying body disposed below the tip end portion and configured to be rotated with an upper side as a return side and a lower side as a carrier side; a plurality of scrapers arranged along the rotation direction of the conveying body and supported by the conveying body; Equipped with The reclaimer is configured such that the carrier moves the scraper suspended from the carrier toward the tip of the boom on the carrier side.

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