Bucket wheel drive shaft of stacker-reclaimer and method for repairing the same

Abstract

The present application relates to the field of stacker-reclaimer, and provides a stacker-reclaimer bucket wheel transmission shaft and a repairing method thereof, which comprises a bucket wheel end, a screw rod coaxially arranged on the bucket wheel end, and a screw cap threadedly connected on the screw rod; a reducer end, at least one flat key groove being formed on the outer periphery of the reducer end, and the flat key groove being used to form a transmission connection with an output shaft of a reducer through a flat key; and a shaft body, an annular limiting deep groove being formed on the shaft body and close to the reducer end. Even if the flat key of the reducer end is worn, only the flat key needs to be replaced, and the bucket wheel transmission shaft does not need to be replaced as a whole. After the screw rod of the bucket wheel end is worn or broken, the screw rod can be re-welded or a new screw rod can be inserted through a hole formed on the bucket wheel end, and only the screw rod needs to be replaced. In this way, the bucket wheel transmission shaft has a certain repairability, the maintenance time and spare part cost are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of stacker-reclaimers, and in particular to a bucket wheel drive shaft for a stacker-reclaimer and a method for repairing it. Background Technology

[0002] Currently, bucket wheel stacker-reclaimers are mainly used in large bulk material yards for stacking and reclaiming operations. Bucket wheel stacker-reclaimers are continuous and efficient bulk material loading and unloading conveying machines, widely used in raw material storage and transportation yards such as ports, power plants, steel mills, and mines. They can realize continuous operations for stacking, transferring, loading, and unloading bulk materials such as coal, ore, and chemical raw materials. The bucket wheel drive shaft is the most important power transmission equipment for realizing the reclaiming function on the stacker-reclaimer; its service life directly affects the overall operating rate of the stacker-reclaimer.

[0003] In existing technology, one end of the bucket wheel drive shaft is connected to a reducer (reducer end), and the other end is connected to the bucket wheel (bucket wheel end). Generally, the reducer end of the bucket wheel drive shaft is connected to the reducer via a spline, and the bucket wheel end has an annular limiting groove for clamping. The bucket wheel end also has a bolt hole, and the connection between the bucket wheel end and the bucket wheel is achieved via bolts. However, the spline frequently wears out and is difficult to repair. Furthermore, the bolt in the threaded hole of the bucket wheel end is often sheared off due to radial force, and the thread is prone to stripping, making repair difficult as well. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a repairable bucket wheel drive shaft for a stacker-reclaimer and a repair method for a bucket wheel drive shaft that is easy to reuse.

[0005] To achieve the above and other related objectives, the present invention provides a bucket wheel drive shaft for a stacker-reclaimer, comprising: a bucket wheel end, wherein a lead screw is coaxially disposed on the bucket wheel end and a nut is threadedly connected to the lead screw; a reducer end, wherein at least one flat keyway is formed on the outer periphery of the reducer end, the flat keyway being used to form a transmission connection with the output shaft of the reducer via a flat key; and a shaft body, wherein an annular limiting deep groove is formed on the shaft body near the reducer end.

[0006] In an optional embodiment of the present invention, two retaining plates are embedded in the annular limiting groove. The retaining plates are semi-circular rings, and the inner diameter of the semi-circular rings is the same as the outer diameter of the bottom of the annular limiting groove.

[0007] In an optional embodiment of the present invention, the bucket wheel end is coaxially provided with a threaded hole, and the lead screw and the threaded hole form a threaded connection.

[0008] In an optional embodiment of the present invention, the diameter of the section of the lead screw located inside the threaded hole is smaller than the diameter of the section of the lead screw located outside the threaded hole.

[0009] In an optional embodiment of the present invention, two nuts are threaded onto the lead screw.

[0010] In an optional embodiment of the present invention, the section of the lead screw located outside the threaded hole has a bidirectional thread, and the two nuts are a forward-rotating nut and a reverse-rotating nut, respectively.

[0011] In an optional embodiment of the present invention, the nut is a round nut with an outer diameter larger than the outer diameter of the shaft.

[0012] A method for repairing the drive shaft of a stacker-reclaimer bucket wheel includes the following steps:

[0013] The spline or keyway at the end of the waste drive shaft bucket wheel is machined into a cylindrical surface;

[0014] At least one flat keyway is milled axially on the cylindrical surface;

[0015] Screw the lead screw coaxially into the reducer end threaded hole of the waste drive shaft;

[0016] Welding is performed at the connection between the lead screw and the waste transmission shaft.

[0017] A nut is threaded onto the lead screw.

[0018] In an optional embodiment of the present invention, the following steps are further included:

[0019] The bottom of the annular limiting groove on the waste drive shaft is milled to obtain an annular limiting deep groove.

[0020] In an optional embodiment of the present invention, the depth of the annular limiting groove is twice the depth of the annular limiting groove.

[0021] In an optional embodiment of the present invention, the sleeve is shaped like a frustum conical, a cylinder, or a sphere, and the inner cavity of the sleeve is shaped like a frustum conical, a cylinder, or a sphere; the outer periphery of the mounting hole has an annular inward flange structure; and the sleeve is made of anti-slip material.

[0022] This invention proposes a method for repairing the bucket wheel drive shaft of a stacker-reclaimer. Even if the key at the reducer end is worn, only the key needs to be replaced, eliminating the need for a complete replacement of the bucket wheel drive shaft. Furthermore, even if the keyway is worn, a new keyway can be milled at another location on the reducer end, without requiring a new bucket wheel drive shaft. Similarly, if the lead screw at the bucket wheel end is stripped or broken, it can be re-welded to the bucket wheel end or a new lead screw can be inserted through a drilling process; again, only the lead screw needs to be replaced. This ensures the repairability of the bucket wheel drive shaft, reducing maintenance time and spare parts costs while improving production efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0025] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0027] The existing defects at both ends of the bucket wheel drive shaft of the stacker-reclaimer are:

[0028] The conventional design for fixing the bucket ring of a bucket wheel stacker-reclaimer involves drilling and tapping holes on the shaft, with two Φ18 high-strength bolts on the shaft end pressure plate for fixation. The drive shaft and reducer are connected via a spline on the shaft. The bucket wheel reducer and drive shaft are fixed by two semi-circular clamping plates on a 5mm deep shaft shoulder, with the reducer and shaft then welded together. However, the bucket ring baffle bolts cannot secure the bucket ring, and the bolts frequently shear off. When the bucket wheel stacker-reclaimer is retrieving material, the cantilever moves in a horizontal arc, scraping the material from the bucket ring, which experiences very large axial forces, causing the shearing of the baffle bolts on the shaft end of the bucket ring, resulting in the bucket ring retracting. Each time, a crane is required, with an average recovery time of about 4 to 5 hours, during which time the stacker-reclaimer is completely inoperable.

[0029] The reducer end (20mm), where the drive shaft mates with the reducer, suffers from frequent spline wear and damage. The spline teeth exhibit severe wear, pitting, and breakage. This damages not only the reducer splines but also exacerbates the damage to the drive shaft splines. Each reducer replacement requires at least 20 hours, and replacing the bucket wheel drive shaft requires approximately 30 hours of downtime. The shaft's design includes a 5mm retaining plate, which easily wears down after use, causing the reducer to frequently disengage during material handling, resulting in at least 6 hours of downtime for emergency repairs. This also potentially reduces the wear and tear on the drive gears.

[0030] like Figure 1 As shown in Figure 1, this invention provides a bucket wheel drive shaft for a stacker-reclaimer, comprising: a bucket wheel end 10, on which a lead screw 11 is coaxially mounted, and a nut 12 is threaded onto the lead screw 11; a reducer end 20, on which at least one flat keyway 21 is formed on the outer periphery, the flat keyway 21 being used to form a transmission connection with the output shaft of the reducer via a flat key; and a shaft body 30, on which an annular limiting deep groove 22 is formed near the reducer end 20. Preferably, two flat keyways 21 are provided in the above scheme, and the two flat keyways 21 are symmetrically arranged about the axis of the flat keyway 21. The purpose of providing two flat keyways 21 is to ensure the stability of the transmission connection while retaining sufficient space on the outer periphery wall, so that more flat keyways 21 can be formed subsequently, and the flat key can be replaced to perform transmission after the flat keyway 21 wears out. Simultaneously, four, six, eight, or twelve parallel keyways 21 can be pre-cut on the outer periphery of the reducer end 20. Two of the four, six, eight, or twelve parallel keyways 21 are connected by a parallel key. Since milling requires a special milling machine, and the bucket wheel drive shaft is difficult to disassemble for milling once installed, multiple grooves can be pre-milled. When the parallel keyway 21 wears, it can be directly replaced for a parallel key connection, saving more time and effort. The purpose of setting the lead screw 11 and nut 12 is to facilitate direct replacement of the lead screw 11 and avoid stripping the thread in the threaded hole 13, making it difficult to remove.

[0031] In an optional embodiment of the present invention, two retaining plates are embedded in the annular limiting groove 22. The retaining plates are semi-circular, and the inner diameter of the semi-circular ring is the same as the outer diameter of the bottom of the annular limiting groove 22. The bucket wheel reducer and drive shaft are fixed by a key connection, with the two retaining plates secured in the annular limiting groove 22, and the reducer and shaft then welded together. This prevents axial sliding of the bucket wheel drive shaft relative to the reducer.

[0032] In an optional embodiment of the present invention, the bucket wheel end 10 is coaxially provided with a threaded hole 13, and the lead screw 11 is threadedly connected to the threaded hole 13. The connection between the threaded hole 13 and the lead screw 11 facilitates the disassembly and replacement of the lead screw 11. If the threaded hole 13 becomes stripped, a larger threaded hole 13 can be tapped on the basis of the original threaded hole 13, and then a larger lead screw 11 can be replaced. The spare parts can be used normally without replacing the entire drive shaft.

[0033] In an optional embodiment of the present invention, the diameter of the section of the lead screw 11 located inside the threaded hole 13 is smaller than the diameter of the section of the lead screw 11 located outside the threaded hole 13. This allows for control of the size of the threaded hole 13 to be smaller, making it easier to further process a larger threaded hole 13.

[0034] In an optional embodiment of the invention, two nuts 12 are threaded onto the lead screw 11. The two nuts 12 prevent it from loosening.

[0035] In an optional embodiment of the present invention, the section of the lead screw 11 located outside the threaded hole 13 has a bidirectional thread, and the two nuts 12 are a forward-rotating nut 12 and a reverse-rotating nut 12, respectively. The forward-rotating nut 12 and the reverse-rotating nut 12 can further prevent the threads from loosening due to vibration.

[0036] In an optional embodiment of the present invention, the nut 12 is a round nut 12 with an outer diameter larger than that of the shaft 30. A larger round nut 12 can better engage the bucket wheel.

[0037] A method for repairing the drive shaft of a stacker-reclaimer bucket wheel includes the following steps:

[0038] The spline or keyway 21 of the waste drive shaft bucket wheel end 10 is machined into a cylindrical surface;

[0039] At least one flat keyway 21 is milled axially on the cylindrical surface;

[0040] Screw the lead screw 11 coaxially into the threaded hole 13 of the reducer end 20 of the waste transmission shaft;

[0041] Welding is performed at the connection between the lead screw 11 and the waste transmission shaft.

[0042] A nut 12 is threaded onto the lead screw 11.

[0043] The above-mentioned repair solution only requires machining on the existing bucket wheel drive shaft, without the need for additional purchases. The scrapped bucket wheel drive shaft can be easily transformed into a new one, significantly reducing spare parts costs and maintenance time. All stacker-reclaimer bucket wheel drive shafts have been successfully repaired and reused using this method, successfully restoring scrapped spare parts and directly saving approximately 50,000 yuan in spare parts costs per production line.

[0044] In an optional embodiment of the present invention, the following steps are further included:

[0045] The bottom of the annular limiting groove on the waste drive shaft is milled to obtain an annular limiting deep groove 22. The original shaft design had a clamping plate fixing step of only 5mm, which was easily worn down after use, causing the reducer to frequently disengage during material handling, directly resulting in at least 6 hours of downtime for emergency repairs. It could also reduce the wear on the mechanical transmission gears. In this application, the annular limiting groove is further deepened to a 10mm annular limiting deep groove 22, which is less prone to wear down and improves the clamping force.

[0046] In an optional embodiment of the present invention, the depth of the annular limiting groove 22 is twice the depth of the annular limiting groove.

[0047] In summary, this invention proposes a bucket wheel drive shaft for a stacker-reclaimer and its repair method. Even if the key at the reducer end 20 is worn, only the key needs to be replaced, without replacing the entire bucket wheel drive shaft. Furthermore, even if the keyway 21 is worn, a new keyway 21 can be milled at another location on the original reducer end 20, eliminating the need to replace the entire bucket wheel drive shaft. Similarly, if the lead screw 11 at the bucket wheel end 10 slips or breaks, it can be re-welded onto the bucket wheel end 10 or a new lead screw 11 can be inserted by drilling a hole; again, only the lead screw 11 needs to be replaced. This ensures the bucket wheel drive shaft has a certain degree of repairability, reducing maintenance time and spare parts costs while improving production efficiency.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0049] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

[0050] Throughout this specification, the terms "an embodiment," "embodiment," or "specific embodiment" refer to a particular feature, structure, or characteristic described in connection with an embodiment that is included in at least one embodiment of the invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the invention.

[0051] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0052] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0053] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0054] The above description of the embodiments shown in this invention (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the invention to the precise forms disclosed herein. Although specific embodiments and examples of the invention have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the invention, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the invention in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the invention.

[0055] This document has generally described the systems and methods in detail to aid in understanding the invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention can be practiced without one or more specific details, or using other means, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

[0056] Therefore, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the foregoing disclosure, and it should be understood that in some cases, certain features of the invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the invention will be defined only by the appended claims.

Claims

1. A method for repairing the bucket wheel drive shaft of a stacker-reclaimer, characterized in that, This is applied to the bucket wheel drive shaft of a stacker-reclaimer, the bucket wheel drive shaft of the stacker-reclaimer comprising: At the bucket wheel end, a lead screw is coaxially provided, and a nut is threaded onto the lead screw; At the reducer end, at least one flat keyway is provided on the outer periphery of the reducer end, and the flat keyway is used to form a transmission connection with the output shaft of the reducer through a flat key. The shaft has an annular limiting groove near the reducer end; two retaining plates are embedded in the annular limiting groove. The retaining plates are semi-circular rings, and the inner diameter of the semi-circular rings is the same as the outer diameter of the bottom of the annular limiting groove. The repair method includes the following steps: The spline or keyway at the end of the waste drive shaft bucket wheel is machined into a cylindrical surface; At least one flat keyway is milled axially on the cylindrical surface; Screw the lead screw coaxially into the reducer end threaded hole of the waste drive shaft; Welding is performed at the connection between the lead screw and the waste transmission shaft. A nut is threaded onto the lead screw; It also includes the following steps: The bottom of the annular limiting groove on the shaft of the waste drive shaft is milled to obtain a deeper annular limiting groove.

2. The method for repairing the bucket wheel drive shaft of a stacker-reclaimer according to claim 1, characterized in that, The bucket wheel end is coaxially provided with a threaded hole, and the lead screw and the threaded hole form a threaded connection.

3. The method for repairing the bucket wheel drive shaft of a stacker-reclaimer according to claim 2, characterized in that, The diameter of the section of the lead screw located inside the threaded hole is smaller than the diameter of the section of the lead screw located outside the threaded hole.

4. The method for repairing the bucket wheel drive shaft of a stacker-reclaimer according to claim 3, characterized in that, The lead screw has two nuts threadedly connected to it.

5. The method for repairing the bucket wheel drive shaft of a stacker-reclaimer according to claim 4, characterized in that, The section of the lead screw located outside the threaded hole has a bidirectional thread, and the two nuts are a forward-rotating nut and a reverse-rotating nut, respectively.

6. The method for repairing the bucket wheel drive shaft of a stacker-reclaimer according to claim 1, characterized in that, The nut is a round nut with an outer diameter larger than the outer diameter of the shaft.

7. The method for repairing the bucket wheel drive shaft of a stacker-reclaimer according to claim 1, characterized in that, The depth of the annular limiting groove is twice the depth of the annular limiting groove.

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