Reclaimer bucket and reclaimer

Abstract

To provide a bucket for a reclaimer in which life of a blade edge has improved, and to provide a reclaimer including the bucket.SOLUTION: A bucket constitutes part of a reclaimer, a plurality of rotary shafts is provided in the circumferential direction of a bucket wheel provided being inclined from a horizontal surface, and the bucket scrapes a bulk cargo stacked at a storage yard via an intake port. The bucket of the reclaimer is cut out in such a manner that a corner part protruding toward the surface of the bulk cargo comes into line contact with the horizontal bulk cargo surface or the ground, out of bucket blade edge hardware mounted protruding from the intake port of the bucket. In the reclaimer, the plurality of buckets of the reclaimer is mounted being evenly allocated in the circumferential direction of the bucket wheel rotating in an inclined manner.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an excavation bucket attached to a bucket wheel of a reclaimer for removing bulk materials such as iron ore and coal stacked in a storage yard and sending them to the next process, and to a reclaimer equipped with such a bucket. [Background technology]

[0002] In the raw material sintering process at steelworks, fine ore from an ore carrier is piled by brand in a crude ore yard by unloader or the like. The piles of crude ore piled by brand are then removed by a reclaimer and blending stacker in a predetermined ratio and piled in layers in an ore equalization yard to form piles. The raw materials are then mixed and removed from the pile by a blending reclaimer.

[0003] When unloading, a double-wheel reclaimer equipped with a pair of bucket wheels is positioned opposite the unloading surface of the pile.

[0004] For example, Patent Document 1 discloses a bucket wheel reclaimer in which the rotation axis of the bucket wheel is tilted from the horizontal plane and a claw is attached to the tip of the bucket. The cutting edge of the bucket claw is parallel to the bucket edge, so it contacts the ground at an angle equal to the angle of inclination of the bucket hole.

[0005] Patent Document 2 discloses a bucket wheel reclaimer in which a bucket wheel for excavating bulk material is attached at an angle to the tip of the boom. The bucket of the bucket wheel is installed so that it is perpendicular to the excavation surface. This allows the amount of excavation to be equal regardless of the direction of the boom rotation. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-144018 [Patent Document 2] Japanese Utility Model Application Publication No. 04-49126 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the conventional technology has the following problems. According to the technology described in Patent Document 1, by placing claws on the corners of the bucket, wear on the corners can be suppressed. However, because the bucket is mounted at an angle, the apex of the bucket's cutting edge contacts the ground at an angle. As a result, the apex of the bucket's cutting edge experiences sliding friction against the hard part of the yard bottom in a manner similar to point contact. This causes the problem of wear progressing from the apex of the bucket's cutting edge. In other words, even if the entire cutting edge remains healthy, rapid wear near the apex forces the cutting edge to be replaced.

[0008] The technology described in Patent Document 2 is based on the assumption that the reclaimer has one bucket wheel. When applied to a double-wheel reclaimer, the number of parts that make up the bucket and wheel increases, which creates problems such as increased maintenance workload and part storage burden.

[0009] The present invention has been made in consideration of the above circumstances, and has an object to provide a reclaimer bucket with an improved cutting edge life, and a reclaimer equipped with the bucket. [Means for solving the problem]

[0010] The reclaimer bucket of the present invention, which advantageously solves the above-mentioned problems, is a bucket that forms part of the reclaimer, is attached in multiple numbers circumferentially to a bucket wheel whose rotation axis is inclined from the horizontal plane, and scrapes off bulk material piled up in a storage yard through an intake port, and is characterized in that the corner of the bucket cutting edge hardware attached to the bucket protruding from the intake port and protruding toward the surface of the bulk material is notched so as to make line contact with the horizontal surface of the bulk material or the ground.

[0011] The reclaimer bucket according to the present invention is (a) The bucket cutting edge hardware is hard-faced with a super-hard material so as to encase the notched tip, (b) the bucket cutting edge hardware with the notched corners is made of a superhard material; This may be a more preferable solution.

[0012] A reclaimer according to the present invention, which advantageously solves the above-described problems, is a reclaimer equipped with a bucket wheel that rotates at an inclination, and is characterized in that a plurality of buckets of any of the above-described reclaimers are attached to the bucket wheel and evenly spaced around the circumferential direction. [Effects of the Invention]

[0013] The reclaimer bucket and reclaimer equipped with this bucket according to the present invention have a notch at the apex where the cutting edge of the bucket comes into contact with the bulk material, resulting in line contact between the cutting edge and the bulk material or the ground, reducing surface pressure and reducing wear on the cutting edge.

[0014] In addition, by hard-facing the notch or by using a super-hard material for the cutting edge hardware including the notch, the reduction in wear life due to the notch can be suppressed. [Brief explanation of the drawings]

[0015] [Figure 1]1A and 1B are schematic diagrams showing a bucket of a reclaimer according to one embodiment of the present invention, in which (a) is a top view looking at the intake port of the bucket, (b) is a side view thereof, and (c) is a front view thereof. [Figure 2] FIG. 2 is a cross-sectional view showing the structure of a bucket wheel provided with a bucket according to the embodiment. [Figure 3] FIG. 2 is a schematic front view of a double-wheel reclaimer equipped with a bucket according to the embodiment. [Figure 4] 3A and 3B are explanatory diagrams illustrating cutting edge hardware of the bucket according to the embodiment. [Figure 5] 1A and 1B are schematic diagrams showing a bucket of a conventional reclaimer, in which (a) is a top view looking at the intake port of the bucket, (b) is a side view thereof, and (c) is a front view thereof. DETAILED DESCRIPTION OF THE INVENTION

[0016] The following is a detailed description of embodiments of the present invention. The following embodiments are intended to exemplify equipment and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope defined in the claims.

[0017] FIG. 1 is a schematic diagram showing a bucket of a reclaimer according to one embodiment of the present invention. FIG. 1(a) is a top view looking at the intake port of the bucket. FIG. 1(b) is a side view of the bucket. FIG. 1(c) is a front view of the bucket. FIG. 2 is a cross-sectional view showing the structure of a bucket wheel according to this embodiment. FIG. 3 is a schematic front view of a double-wheel reclaimer equipped with a bucket according to this embodiment. FIG. 4 is a plan view and a cross-sectional view explaining the cutting edge hardware of the bucket according to this embodiment.

[0018] A double-wheel reclaimer, such as the one shown in Figure 3, is a reclaimer 10 that scrapes and removes bulk materials S, such as iron ore and coal, piled up in storage yards at steel mills and other facilities. The reclaimer 10 is equipped with an excavation bucket 1 for scraping off the bulk materials S, and a bucket wheel 2 with multiple buckets 1 evenly spaced around its circumference.

[0019] For example, the reclaimer 10 has a bridge frame 11 that extends in the direction of movement of a carriage frame 20. The bridge frame 11 is supported by a jib attached to the base of the traveling frame. The bridge frame 11 supports the carriage frame 20, which is movable in the longitudinal direction of the bridge frame 11. This movement of the carriage frame 20 is called lateral travel.

[0020] The carriage frame 20 has a carriage body 21 and a pair of arms 22 extending upward from the carriage body 21. A rack and pinion mechanism, for example, can be used as a mechanism for moving the carriage frame 20 along the bridge frame 11. However, other drive mechanisms can also be used as long as the carriage frame 20 can move along the bridge frame 11.

[0021] As shown in Figure 3, two harrows (breaking tools) 12 are provided on the carriage frame 20. The harrows 12 are used to break up piles of bulk material stored in the yard and drop the bulk material S downward.

[0022] A pair of bucket wheels 2 are rotatably mounted in a plane-symmetrical arrangement on the carriage frame 20. The rotation axis RC of the bucket wheel 2 is inclined at an angle α with respect to the horizontal plane HP. Specifically, the bucket wheels 2 are inclined in such a way that the upper portions of the pair of bucket wheels 2 approach each other.

[0023] As shown in Fig. 2, the shaft 2A of the bucket wheel 2 is attached to the carriage body 21 of the carriage frame 20 via a bearing 2E. An electric motor 2B is connected to the shaft 2A, and the driving force of the electric motor 2B is transmitted to the shaft 2A. A reducer or the like may be disposed between the electric motor 2B and the shaft 2A to increase torque.

[0024] A plurality of spokes 2C are fixed to the shaft 2A, and the plurality of spokes 2C extend radially from the rotation axis RC. One end of each spoke 2C is fixed to the shaft 2A, and the other end is fixed to the rim 2D. The rim 2D is formed in an annular shape with the rotation axis RC as its symmetrical center axis, and has a cylindrical surface that extends approximately parallel to the rotation axis RC.

[0025] The other ends of spokes 2C are fixed to the inner peripheral surface of rim 2D. A plurality of buckets 1 are fixed to the outer peripheral surface of rim 2D, spaced evenly in the circumferential direction. When shaft 2A rotates around rotation axis RC, the plurality of buckets move along a circle centered on rotation axis RC.

[0026] The bucket 1 rotates to scrape away the loose grain S that has been scraped up by the harrow 12. For this reason, the rotation of the bucket wheel 2 causes the loose grain S to enter the bucket 1 through the intake port 1E of the bucket 1.

[0027] The bulk materials S scraped into the bucket 1 fall naturally by gravity from the bucket 1 when the bucket 1 moves to a preset position above the bucket wheel 2, and are then discharged from the bucket 1. The bulk materials S discharged from the bucket 1 fall onto the conveyor 3 installed below the bucket 1 via the chute 4, are transported by the conveyor 3, and are then transported via the relay conveyor 5 to a ground belt conveyor (not shown) and carried out.

[0028] In this embodiment, the angle α between the rotation axis RC of the bucket wheel 2 and the horizontal plane HP is greater than 0° and not greater than 20°. It is preferably in the range of 5 to 20°. Since the rotation axis RC of the bucket wheel 2 is inclined, the bucket 1 is also inclined with respect to the horizontal plane HP.

[0029] As shown in Figure 1, the intake port 1E of the bucket 1 is polygonal. The intake port 1E is composed of a bucket cutting edge 1B for scooping up bulk items S, and a cutting edge fitting 1C fixed to the bucket cutting edge 1B. As the bucket wheel 2 rotates, the tip of the cutting edge fitting 1C first comes into contact with the bulk items S. The cutting edge fitting 1C can be fixed to the bucket cutting edge 1B in any manner as long as it can be fixed. For example, the base end of the cutting edge fitting can be inserted into a holder attached to the bucket cutting edge. It can also be fixed by bolting or welding.

[0030] FIG. 1(a) is a top view looking into the intake port 1E of the bucket 1, i.e., a view from the direction of rotation of the bucket wheel 2. The bucket 1 has five cutting edge hardware 1C, numbered 1C1 to 1C5, arranged in a clockwise direction. Here, of the sides of the polygon that make up the intake port 1E of the bucket 1, the side farthest from the rim 2D is defined as the bucket's base (1C3). Furthermore, of the faces that make up the bucket body 1A, the face that includes the base and is parallel to the base is defined as the bottom face. The other bucket wheel 2, which is arranged symmetrically with respect to the plane, has a rotation axis that is tilted in the opposite direction, so the bucket 1 can have its cutting edge hardware 1C1 to 1C5 arranged interchangeably in a counterclockwise direction.

[0031] In the example of FIG. 1, the first place that comes into contact with the bulk items S as the bucket wheel 2 rotates is the corner formed by the cutting edge hardware 1C3 located at the bottom of the bucket 1 and the adjacent cutting edge hardware 1C4. In this embodiment, a notch 1D is provided at this corner. In the top view looking into the intake port 1E of the bucket 1 shown in FIG. 1(a), the notch 1D is configured to form an angle α with the bottom of the cutting edge hardware 1C3. Therefore, as shown in FIG. 2, when the bucket 1 reaches its lowest point as the bucket wheel 2 rotates, the notch 1D of the cutting edge hardware 1C of the bucket 1 comes into line contact with the bulk items S and the horizontal surface HP of the ground.

[0032] In the conventional bucket 1 shown in Figure 5, wear point D comes into point contact with the bulk material S, increasing the surface pressure and causing significant wear. In this embodiment, cutting edge hardware 1C3, 1C4 comes into line contact with the bulk material S or the ground, reducing the surface pressure and wear, thereby improving the life of the cutting edge hardware.

[0033] The shape of the notch 1D of the cutting edge hardware 1C is preferably determined as follows. (1) The notch 1D is located on a conical surface whose central axis is the rotation axis RC of the bucket wheel 2, and the horizontal plane is the tangent plane to the cone. (2) The conical surface including the notch 1D must not cut other components of the bucket, such as the tip of the mounting bolt of the cutting edge fitting 1C. (3) The height of the notch 1D (h1 or h2 in FIG. 4) must be in the range of 0.2 to 0.3 times the protruding height of the cutting edge hardware 1C3, 1C4 (H1 or H2 in FIG. 4).

[0034] If the ratio of the height of the notch 1D to the protruding height of the cutting edge hardware 1C, h1 / H1 or h2 / H2, exceeds 0.3, there is a risk that the original function of the cutting edge hardware 1C, which is to efficiently scrape off loose material while suppressing wear on the bucket body, will be impaired.On the other hand, if the ratio falls below 0.2, the length of the line contact will be too short, and the effect of reducing surface pressure will be too small, which may impair the effect of reducing wear.

[0035] The cutting edge metal 1C is preferably made of wear-resistant steel. The wear-resistant steel preferably has a Brinell hardness of HB400 or higher. Additionally, the tip of the cutting edge metal forming the inlet 1E of the bucket 1 is preferably hard-faced 1F by overlay welding using cemented carbide. As shown in FIG. 4, the hard-facing 1F is preferably machined to a height equal to or greater than the plate thickness on the tip end face of the cutting edge metal 1C and on the inner and outer surfaces of the bucket 1. The hard-facing 1F near the notch 1D is preferably at least 0.5 times the protrusion height of the cutting edge metal 1C. Because the outer surface of the bucket is subject to more severe wear conditions than the inner surface, the height of the hard-facing 1F on the inner surface is preferably no more than twice the plate thickness, and the height of the hard-facing 1F on the outer surface, excluding the vicinity of the notch 1D, is preferably no more than the greater of twice the plate thickness or half the protrusion height. The build-up welding used for the hard facing processed portion 1F can be performed by hard-facing welding using a weld metal having a nominal hardness of 800 and a Vickers hardness of Hv750 or more as specified in JIS Z3326:1999.

[0036] In addition, at least the vicinity of the notched portion 1D of the cutting edge hardware 1C can be made of a superhard material that is harder than the other parts. A Vickers hardness of Hv800 or higher is preferable. The superhard material can be a WC-Co or WC-TiC-TaC-Co based superhard alloy. This allows the notched portion 1D to have a shorter protruding height than the other parts, but still have a wear life equal to or greater than that of the other parts. The entire cutting edge hardware 1C, including the notched portion 1D, can be made of a superhard material. [Explanation of symbols]

[0037] 1 bucket 1A Bucket body 1B Bucket cutting edge 1C, 1C1 to 1C5 (Bucket) Cutting Edge Metal Fittings 1D (cutting edge metal) notch 1E intake port 1F Hardfacing Processing Department 2 bucket wheels 2A shaft part 2B Electric motor 2C spoke 2D Rim 2E bearing 3 Conveyor 4 shots 5 Relay conveyor 10 Reclaimer 11 Bridge Frame 12 Hello 20 Carriage frame 21 Carriage body 22 Arm S Loose items (pile) α (bucket wheel) tilt angle RC Rotating Axis HP horizontal plane D Wear points

Claims

1. A bucket that constitutes part of a reclaimer and is attached in a circumferential direction to a bucket wheel whose rotation axis is inclined from the horizontal plane, and scrapes off bulk materials stacked in a storage yard through an intake port. A reclaimer bucket in which the corners of the bucket cutting edge hardware attached to protrude from the intake port of the bucket that protrude toward the surface of the bulk material are cut out so as to make line contact with the horizontal surface of the bulk material or the ground.

2. 2. The reclaimer bucket according to claim 1, wherein the bucket cutting edge hardware is hard-faced with a super-hard material so as to encase the notched tip.

3. The reclaimer bucket according to claim 1 , wherein the bucket cutting edge hardware with the notched corners is made of a superhard material.

4. A reclaimer having a tilting rotating bucket wheel, A reclaimer, wherein a plurality of the reclaimer buckets according to any one of claims 1 to 3 are attached to the bucket wheel at equal intervals in the circumferential direction.

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