Roller assembly and grab bucket for hoisting machinery

Abstract

The utility model belongs to the technical field of grabbing machinery, and discloses a roller assembly and a grab bucket for hoisting machinery. Wherein the mounting rollers comprise a first mounting roller, a second mounting roller, a third mounting roller and a fourth mounting roller, a first gap is formed between the arc-shaped surfaces of the first mounting roller and the second mounting roller, a second gap is clamped between the arc-shaped surfaces of the third mounting roller and the fourth mounting roller, and the steel wire rope penetrates through the first gap and the second gap simultaneously and is reversely projected along the length of the steel wire rope. The overlapped area of the first gap and the second gap is quadrilateral; the problem that in the prior art, pulleys need to be replaced frequently, and consequently the working efficiency of the grab bucket becomes low is solved.

Description

Technical Field

[0001] This utility model relates to the field of gripping machinery technology, and in particular to a roller assembly and grab for lifting machinery. Background Technology

[0002] A dry coal shed is a large storage facility in a thermal power plant for coal. It requires the use of large grab buckets to move the coal. The grab buckets are assembled into the dry coal shed structure for grabbing coal. The original grab bucket pulley system consists of two grooved ordinary carbon steel pulleys assembled side-by-side in the gap between two parallel steel plates. The edges of the pulleys form semi-circular grooves, which interlock to form a circular groove. The wire rope passes through this circular groove and is limited by pulleys on both sides. During the movement of the grab bucket, due to space constraints, it may need to be pulled at an angle. This will cause the wire rope to tilt along the axis of the pulleys, while the pulleys remain vertical. This causes the wire rope to press against both sides of the semi-circular groove of the pulley along its axial direction. During operation, one side of the pulley will be repeatedly rubbed by the wire rope, and the wire rope will directly press against the edge of the semi-circular groove. The axial friction between the wire rope and the pulley will be close to sliding friction. If the grab bucket grabs coal, the wear on the edge of the pulley will increase, accelerating the wear of the pulley. Eventually, after the wire rope wears through the pulley, it will further wear down the steel plates on both sides of the pulley. This will make the wire rope easily get stuck in the steel plates and break completely. In daily use, the pulley needs to be replaced about every 20 days, increasing the maintenance cost of the grab bucket and reducing work efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a roller assembly and grab for lifting machinery, which solves the problem that the grab's working efficiency is reduced due to the need to frequently replace pulleys in the existing technology.

[0004] To achieve this objective, the present invention adopts the following technical solution: The present invention provides a roller assembly for lifting machinery, including a first mounting roller, a second mounting roller, a third mounting roller and a fourth mounting roller. A first gap is formed between the arcuate surfaces of the first mounting roller and the second mounting roller, and a second gap is sandwiched between the arcuate surfaces of the third mounting roller and the fourth mounting roller. A wire rope passes through both the first gap and the second gap simultaneously. Projected backward along the length of the wire rope, the overlapping area of ​​the first gap and the second gap is quadrilateral.

[0005] Preferably, the first mounting roller and the second mounting roller are parallel to each other in the axial direction.

[0006] Preferably, the third mounting roller and the fourth mounting roller are parallel to each other in the axial direction.

[0007] Preferably, the axes of the first mounting roller and the third mounting roller are perpendicular.

[0008] Preferably, the roller assembly includes a first steel plate and a second steel plate. The first steel plate has two sets of first mounting holes, and the second steel plate has two sets of second mounting holes. A first rod is provided at the axis of the first mounting roller, and a second rod is provided at the axis of the second mounting roller. The two ends of the first rod are respectively inserted into the first mounting hole and the second mounting hole, and the two ends of the second rod are respectively inserted into the first mounting hole and the second mounting hole.

[0009] Preferably, the roller assembly includes a third steel plate and a fourth steel plate. The third steel plate has two sets of third mounting holes, and the fourth steel plate has two sets of fourth mounting holes. A third rod is provided at the axis of the third mounting roller, and a fourth rod is provided at the axis of the fourth mounting roller. The two ends of the third rod are respectively inserted into the third mounting hole and the fourth mounting hole, and the two ends of the fourth rod are respectively inserted into the third mounting hole and the fourth mounting hole.

[0010] Preferably, the first steel plate frame is mounted on the upper side of the third steel plate, and the second steel plate is mounted on the upper side of the fourth steel plate.

[0011] Preferably, the first mounting roller and the second mounting roller have a diameter of 8cm and a length of 12cm, and the third mounting roller and the fourth mounting roller have a diameter of 8cm and a length of 6cm.

[0012] Preferably, the distance between the first mounting roller and the second mounting roller is 4cm, the distance between the third mounting roller and the fourth mounting roller is 4cm, and the distance between the axes of the first mounting roller and the third mounting roller is 12cm.

[0013] A grab bucket includes the roller assembly for lifting machinery described above, and also includes a wire rope and a grab bucket body, the wire rope passing through a first gap and a second gap, a grab head body being installed at the lower end of the wire rope, and the grab bucket body being capable of grabbing objects.

[0014] Beneficial effects: The wire rope swings back and forth within the first and second gaps. Regardless of the direction of its swing, the wire rope will press against the arc-shaped surface of any one of the first to fourth mounting rollers. This limits the range of motion of the wire rope. Simultaneously, when the wire rope contacts the arc-shaped surface of the mounting roller, it drives the mounting roller to rotate, changing the original sliding friction against the pulley into rolling friction between the wire rope and the mounting roller. No matter the direction of the swing, the wire rope will impact one of the arc-shaped surfaces of the first to fourth mounting rollers, causing the contacted mounting roller to rotate. This reduces wear on the components surrounding the wire rope, decreases maintenance frequency, and ultimately improves the working efficiency of the grab bucket. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the distribution of the mounting rollers in this utility model;

[0016] Figure 2 This is a schematic diagram of the steel plate installation of this utility model.

[0017] In the diagram: 1. First mounting roller; 11. First rod; 2. Second mounting roller; 21. Second rod; 3. Third mounting roller; 31. Third rod; 4. Fourth mounting roller; 41. Fourth rod; 5. First steel plate; 51. First mounting hole; 6. Second steel plate; 61. Second mounting hole; 7. Third steel plate; 71. Third mounting hole; 8. Fourth steel plate; 81. Fourth mounting hole; 9. Steel wire rope. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0022] In the existing technology, the wire rope moves radially along the pulleys within a circular groove formed between two sets of pulleys. The wire rope presses against the center of the semi-circular groove of the pulley, with the pressing line tangential to the free rotation of the pulley. Driven by friction, the wire rope causes the pulley to roll, changing the friction between the wire rope and pulley from sliding friction to rolling friction. However, the wire rope moves axially along the pulley, pressing against the edge of the semi-circular groove. The pressing direction cannot drive the pulley to rotate, resulting in sliding friction between the wire rope and the pulley. This causes rapid wear on the edge of the pulley groove, eventually leading to the wire rope wearing into the embedded steel plate. This necessitates frequent pulley replacement, resulting in lower grab bucket efficiency and increased maintenance costs.

[0023] To solve the above problems, such as Figures 1 to 2 As shown, this utility model provides a roller assembly for lifting machinery, including a first mounting roller 1, a second mounting roller 2, a third mounting roller 3, and a fourth mounting roller 4. A first gap is formed between the arc-shaped surfaces of the first mounting roller 1 and the second mounting roller 2, and a second gap is sandwiched between the arc-shaped surfaces of the third mounting roller 3 and the fourth mounting roller 4. A wire rope 9 passes through both the first gap and the second gap simultaneously. Projected backward along the length of the wire rope 9, the overlapping area of ​​the first gap and the second gap is quadrilateral. The cylinders on the outer sides of the four sets of mounting rollers can rotate.

[0024] The first mounting roller 1 and the second mounting roller 2 of this utility model are installed on the upper side of the third mounting roller 3 and the fourth mounting roller 4. During the swaying process of the wire rope 9 in the above-mentioned quadrilateral area, no matter where it sways, it will contact the arc-shaped surface of one of the above-mentioned sets of mounting rollers. Then, driven by friction, the contacted mounting roller can rotate under the drive of the wire rope 9. Finally, the contact between the wire rope 9 and the mounting roller changes from sliding friction to rolling friction. This can reduce the wear on the first mounting roller 1 to the fourth mounting roller 4, extend the service life of the roller assembly, reduce the number of maintenance and replacement parts, and thus improve the working efficiency of the grab bucket.

[0025] The first mounting roller 1 and the second mounting roller 2 are parallel to each other in the axial direction, forming a first gap between them. The wire rope 9 can swing back and forth within the first gap, or it can be directly pressed against the first mounting roller 1 or the second mounting roller 2. The third mounting roller 3 and the fourth mounting roller 4 are parallel to each other in the axial direction, and the wire rope 9 also swings back and forth within the second gap. The wire rope 9 can be directly pressed against the third mounting roller 3 and the fourth mounting roller 4. The wire rope 9 may move towards the corners of the quadrilateral, and it may also strike two different mounting rollers on the upper and lower layers simultaneously. As long as the wire rope 9 contacts the mounting rollers, it can abut against each other, thereby driving the mounting rollers to roll. This transforms the sliding friction between the wire rope 9 and the mounting rollers into rolling friction, reducing the frictional loss between the wire rope 9 and the roller assembly, and decreasing the frequency of maintenance of the roller assembly.

[0026] The axes of the first mounting roller 1 and the third mounting roller 3 are perpendicular, allowing the wire rope 9 to move freely within the quadrilateral space. The wire rope 9 typically moves along the axes of the first mounting roller 1 and the third mounting roller 3. By placing the first mounting roller 1 and the third mounting roller 3 in a vertical position, the wire rope 9 can be pressed against any set of mounting rollers. This allows the rolling friction between the wire rope 9 and the mounting rollers to replace sliding friction, reducing wear and thus reducing maintenance frequency and improving the working efficiency of the grab bucket.

[0027] The roller assembly includes a first steel plate 5 and a second steel plate 6. The first steel plate 5 has two sets of first mounting holes 51, and the second steel plate 6 has two sets of second mounting holes 61. A first rod 11 is provided at the axis of the first mounting roller 1. Each end of the first rod 11 is equipped with a bearing and embedded in the first mounting roller 1, and the two can move relative to each other.

[0028] A second rod 21 is provided at the axis of the second mounting roller 2. Each end of the second rod 21 is equipped with a bearing and embedded in the second mounting roller 2, allowing the two to move relative to each other. The two ends of the first rod 11 are respectively inserted into the first mounting hole 51 and the second mounting hole 61, and the two ends of the second rod 21 are respectively inserted into the first mounting hole 51 and the second mounting hole 61, and are fixed by locking nuts.

[0029] The first mounting roller 1 and the second mounting roller 2 roll between the first steel plate 5 and the second steel plate 6. The first steel plate 5 and the second steel plate 6 can fix the two sets of mounting rollers, so that the mounting rollers can remain stable when hit by the wire rope 9, and the mechanical strength of the roller assembly is higher.

[0030] The roller assembly includes a third steel plate 7 and a fourth steel plate 8. The third steel plate 7 has two sets of third mounting holes 71, and the fourth steel plate 8 has two sets of fourth mounting holes 81. A third rod 31 is positioned at the axis of the third mounting roller 3, and a fourth rod 41 is positioned at the axis of the fourth mounting roller 4. Both ends of the third rod 31 are inserted into the third mounting holes 71 and the fourth mounting holes 81, respectively, and both ends of the fourth rod 41 are inserted into the third mounting holes 71 and the fourth mounting holes 81, respectively. Typically, the rods are threaded, and the inner walls of the mounting holes are also threaded. Nuts are screwed onto the rods to secure the mounting rollers.

[0031] The third mounting roller 3 and the fourth mounting roller 4 roll between the third steel plate 7 and the fourth steel plate 8. The third steel plate 7 and the fourth steel plate 8 can fix the two sets of mounting rollers, so that the mounting rollers can remain stable when hit by the wire rope 9, and the mechanical strength of the roller assembly is higher.

[0032] The first steel plate 5 is mounted on the upper side of the third steel plate 7 and connected by welding. The second steel plate 6 is mounted on the upper side of the fourth steel plate 8 and also connected by welding. This makes the roller assembly more integrated and extends its service life.

[0033] The first mounting roller 1 and the second mounting roller 2 have a diameter of 8 cm and a length of 12 cm, while the third mounting roller 3 and the fourth mounting roller 4 have a diameter of 8 cm and a length of 6 cm. The length of the mounting rollers is defined according to the range of motion of the wire rope 9. The lower third mounting roller 3 and the fourth mounting roller 4 have a shorter installation distance, which can reduce the overall weight of the roller assembly.

[0034] The distance between the centers of the first mounting roller 1 and the second mounting roller 2 is 4cm, the distance between the centers of the third mounting roller 3 and the fourth mounting roller 4 is 4cm, and the distance between the axes of the first mounting roller 1 and the third mounting roller 3 is 12cm. This avoids interference between the upper and lower mounting rollers. At the same time, the wire rope 9 moves within a rectangular area with a side length of 4cm to prevent the wire rope 9 from moving too much within the aforementioned area.

[0035] This utility model also provides a grab bucket, including the roller assembly for lifting machinery described above, and also includes a wire rope 9 and a grab bucket body. The wire rope 9 passes through a first gap and a second gap. A grab head body is installed at the lower end of the wire rope 9. The grab bucket body can grab objects. Finally, the contact between the mounting roller and the wire rope 9 can reduce the wear on the roller assembly and reduce the maintenance frequency.

[0036] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A roller assembly for lifting machinery, characterized in that, It includes a first mounting roller (1), a second mounting roller (2), a third mounting roller (3) and a fourth mounting roller (4). A first gap is formed between the arc surfaces of the first mounting roller (1) and the second mounting roller (2). A second gap is sandwiched between the arc surfaces of the third mounting roller (3) and the fourth mounting roller (4). The wire rope (9) passes through the first gap and the second gap simultaneously. When projected in reverse along the length of the wire rope (9), the area where the first gap and the second gap overlap is quadrilateral.

2. The roller assembly for lifting machinery according to claim 1, characterized in that, The first mounting roller (1) and the second mounting roller (2) are parallel to each other in the axial direction.

3. The roller assembly for lifting machinery according to claim 2, characterized in that, The third mounting roller (3) and the fourth mounting roller (4) are parallel to each other in the axial direction.

4. The roller assembly for lifting machinery according to claim 3, characterized in that, The axes of the first mounting roller (1) and the third mounting roller (3) are perpendicular.

5. The roller assembly for lifting machinery according to claim 1, characterized in that, The roller assembly includes a first steel plate (5) and a second steel plate (6). The first steel plate (5) has two sets of first mounting holes (51), and the second steel plate (6) has two sets of second mounting holes (61). A first rod (11) is provided at the axis of the first mounting roller (1), and a second rod (21) is provided at the axis of the second mounting roller (2). The two ends of the first rod (11) are respectively inserted into the first mounting hole (51) and the second mounting hole (61), and the two ends of the second rod (21) are respectively inserted into the first mounting hole (51) and the second mounting hole (61).

6. The roller assembly for lifting machinery according to claim 5, characterized in that, The roller assembly includes a third steel plate (7) and a fourth steel plate (8). The third steel plate (7) has two sets of third mounting holes (71), and the fourth steel plate (8) has two sets of fourth mounting holes (81). A third rod (31) is provided at the axis of the third mounting roller (3), and a fourth rod (41) is provided at the axis of the fourth mounting roller (4). The two ends of the third rod (31) are respectively inserted into the third mounting hole (71) and the fourth mounting hole (81), and the two ends of the fourth rod (41) are respectively inserted into the third mounting hole (71) and the fourth mounting hole (81).

7. The roller assembly for lifting machinery according to claim 6, characterized in that, The first steel plate (5) is mounted on the upper side of the third steel plate (7), and the second steel plate (6) is mounted on the upper side of the fourth steel plate (8).

8. The roller assembly for lifting machinery according to claim 4, characterized in that, The first mounting roller (1) and the second mounting roller (2) have a diameter of 8cm and a length of 12cm, and the third mounting roller (3) and the fourth mounting roller (4) have a diameter of 8cm and a length of 6cm.

9. The roller assembly for lifting machinery according to claim 8, characterized in that, The distance between the first mounting roller (1) and the second mounting roller (2) is 4cm, the distance between the third mounting roller (3) and the fourth mounting roller (4) is 4cm, and the distance between the axes of the first mounting roller (1) and the third mounting roller (3) is 12cm.

10. A grab bucket, characterized in that, The roller assembly for lifting machinery as described in claim 1 further includes a wire rope (9) and a grab body, the wire rope (9) passing through the first gap and the second gap, the lower end of the wire rope (9) being fitted with a grab head body, and the grab body being capable of grabbing objects.

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