An excavator boom

Abstract

The utility model discloses excavator movable arm, including movable arm main part, movable arm main part adopts box type structure, and movable arm main part is by upper cover, lower cover, left side board, right side board welding forming, the inside of movable arm main part is provided with reinforcing structure, one end of movable arm main part is provided with first hinged portion, and first hinged portion is by two groups of symmetrical connecting plate and is formed, and first hinged portion and movable arm main part are integrally formed, and first hinged portion is provided with the first hinged hole of penetration, and the other end of movable arm main part is provided with second hinged portion, and second hinged portion and movable arm main part are integrally formed, and second hinged portion is provided with the second hinged hole of penetration, and first hinged hole and second hinged hole inside are provided with detachable bushing subassembly. The utility model prolongs the service life of movable arm, when wear -resistant inner lining wears to certain degree, only needs to replace detachable bushing subassembly, need not to replace whole movable arm, and maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically to an excavator boom. Background Technology

[0002] The excavator boom is the core working component of an excavator, mainly used to connect the frame and the stick, and to perform load transfer and motion execution during excavation operations. Existing excavator booms have the following technical defects: First, traditional booms mostly use a box-shaped structure welded from a single steel plate, lacking targeted internal reinforcement design. This makes them prone to stress concentration under impact loads, and after long-term use, they are prone to excessive deflection in the middle or cracking at the hinge joint. Second, the hinge holes for the boom, stick, and frame are directly machined onto the boom body. During operation, the inner wall of the hinge hole rubs against the pin for a long time, easily leading to excessive wear. Maintenance requires complex procedures such as welding and boring of the boom body, resulting in high maintenance costs and long maintenance cycles. Summary of the Invention

[0003] The purpose of this invention is to provide an excavator boom to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an excavator boom, comprising a boom body, the boom body adopting a box-shaped structure, the boom body being welded together from an upper cover plate, a lower cover plate, a left side plate, and a right side plate, the boom body having an internal reinforcing structure, a first hinge portion being provided at one end of the boom body, the first hinge portion being composed of two sets of symmetrical connecting plates, the first hinge portion being integrally formed with the boom body, the first hinge portion having a through first hinge hole, the other end of the boom body having a second hinge portion, the second hinge portion being integrally formed with the boom body, the second hinge portion having a through second hinge hole, a detachable bushing assembly being provided inside the first hinge hole and the second hinge hole, the detachable bushing assembly including a wear-resistant inner liner and a mounting hole.

[0005] Preferably, the reinforcing structure is a reinforcing rib, which is located inside the boom body and spaced along the length direction. The cross-section of the reinforcing rib is an isosceles triangle, and the reinforcing rib is located at the connecting corner of the upper cover plate, lower cover plate, left side plate, and right side plate.

[0006] Preferably, the mounting holes are respectively formed on the first hinge portion and the second hinge portion, and the wear-resistant liner is embedded in the mounting holes.

[0007] Preferably, a fixing structure is provided between the wear-resistant liner and the mounting hole. The fixing structure includes a fixing bolt and a bolt hole. The bolt hole is respectively opened on the first hinge portion and the second hinge portion. The fixing bolt passes through the bolt hole and abuts against the wear-resistant liner.

[0008] Preferably, a positioning structure is further provided between the wear-resistant liner and the mounting hole. The positioning structure includes a positioning strip fixedly disposed on the outer ring of the wear-resistant liner and a positioning groove formed on the inner wall of the mounting hole. The positioning strip and the positioning groove cooperate with each other.

[0009] Preferably, an annular reinforcing plate is fixedly installed on the outer side of the first hinge hole and the second hinge hole.

[0010] Preferably, an elliptical weight-reducing hole is provided in the non-stressed area in the middle of the boom body, and an annular reinforcing edge is provided at the edge of the weight-reducing hole, which is integrally stamped with the boom body.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model adopts a box-shaped structure with isosceles triangular reinforcing ribs, which effectively disperses the impact stress generated during excavation operations and avoids the problem of excessive deflection in the middle of the traditional boom. The introduction of detachable bushing components means that after the hinge hole is worn, only the wear-resistant inner liner needs to be replaced to restore the accuracy of use. There is no need to repair welding or boring the boom body, which greatly reduces maintenance costs and downtime.

[0012] 2. This utility model ensures the stability of the wear-resistant liner in the mounting hole through the dual protection of the positioning structure and the fixing structure, preventing loosening or displacement during operation; the coordinated design of the annular reinforcing plate and the weight reduction hole not only enhances the structural strength around the hinge hole, but also optimizes the overall mechanical performance of the boom by reducing the weight of the non-stressed area. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a top view of the structure of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the boom body of this utility model; Figure 5 This is a schematic diagram of the wear-resistant inner lining structure of this utility model.

[0014] In the diagram: 1. Boom body; 2. Upper cover plate; 3. Lower cover plate; 4. Left side plate; 5. Right side plate; 6. First hinge part; 7. First hinge hole; 8. Second hinge part; 9. Second hinge hole; 10. Removable bushing assembly; 11. Wear-resistant inner liner; 12. Mounting hole; 13. Reinforcing rib; 14. Fixing bolt; 15. Bolt hole; 16. Positioning strip; 17. Positioning groove; 18. Annular reinforcing plate; 19. Annular reinforcing edge; 20. Weight reduction hole. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-5 This utility model provides a technical solution for an excavator boom: it includes a boom body 1, which adopts a box-shaped structure. The boom body 1 is formed by welding an upper cover plate 2, a lower cover plate 3, a left side plate 4, and a right side plate 5. The boom body 1 has a reinforcing structure inside. One end of the boom body 1 is provided with a first hinge part 6, which is composed of two sets of symmetrical connecting plates. The first hinge part 6 is integrally formed with the boom body 1. The first hinge part 6 is provided with a through first hinge hole 7. The other end of the boom body 1 is provided with a second hinge part 8, which is integrally formed with the boom body 1. The second hinge part 8 is provided with a through second hinge hole 9. The first hinge hole 7 and the second hinge hole 9 are provided with a detachable bushing assembly 10. The detachable bushing assembly 10 includes a wear-resistant inner liner 11 and a mounting hole 12.

[0017] Furthermore, the reinforcing structure is a reinforcing rib 13, which is located inside the boom body 1 and spaced along the length direction. The cross-section of the reinforcing rib 13 is an isosceles triangle, and the reinforcing rib 13 is located at the connecting corner of the upper cover plate 2, the lower cover plate 3, the left side plate 4, and the right side plate 5.

[0018] In this embodiment, the reinforcing ribs 13 effectively disperse the stress borne by the boom body 1 during operation, enhancing the stability of the structure. The reinforcing ribs 13, spaced apart along the length, can be specifically reinforced according to the stress conditions of different parts of the boom body 1. This ensures the overall strength of the boom body 1 while avoiding unnecessary material waste, reducing the weight of the boom body 1, and improving the excavator's working efficiency. Furthermore, the reinforcing ribs 13 are placed at the connecting corners of the upper cover plate 2, lower cover plate 3, left side plate 4, and right side plate 5 because these areas are where stress concentration is most pronounced in the boom body 1 structure. The reinforcing ribs 13 significantly improve the connection strength of these critical parts, preventing cracks or deformation at the connections due to long-term stress, and extending the service life of the boom body 1.

[0019] Furthermore, the mounting holes 12 are respectively opened on the first hinge portion 6 and the second hinge portion 8, and the wear-resistant liner 11 is embedded in the mounting holes 12.

[0020] In this embodiment, the wear-resistant liner 11 enhances the wear resistance of the mounting hole 12, effectively resists wear caused by long-term friction, extends the service life of the mounting hole 12, and also reduces the maintenance costs and time caused by replacing worn parts.

[0021] Furthermore, a fixing structure is provided between the wear-resistant liner 11 and the mounting hole 12. The fixing structure includes a fixing bolt 14 and a bolt hole 15. The bolt hole 15 is respectively opened on the first hinge portion 6 and the second hinge portion 8. The fixing bolt 14 passes through the bolt hole 15 and abuts against the wear-resistant liner 11.

[0022] In this embodiment, the use of fixing bolt 14 and bolt hole 15 provides a stable fixing method for wear-resistant liner 11, ensuring the positional stability of wear-resistant liner 11 in mounting hole 12, avoiding displacement or detachment of wear-resistant liner 11 due to vibration or impact during operation, thereby ensuring that wear-resistant liner 11 can continuously and effectively perform its wear-resistant function.

[0023] Furthermore, a positioning structure is provided between the wear-resistant liner 11 and the mounting hole 12. The positioning structure includes a positioning strip 16 fixedly disposed on the outer ring of the wear-resistant liner 11 and a positioning groove 17 opened on the inner wall of the mounting hole 12. The positioning strip 16 and the positioning groove 17 cooperate with each other.

[0024] In this embodiment, the cooperation between the positioning strip 16 and the positioning groove 17 further enhances the positioning accuracy of the wear-resistant liner 11 within the mounting hole 12, enabling the wear-resistant liner 11 to quickly and accurately find its predetermined position during installation, thus improving installation efficiency. Simultaneously, during operation, the positioning structure effectively prevents the wear-resistant liner 11 from rotating or shifting due to external forces, thereby ensuring a tight fit between the wear-resistant liner 11 and the mounting hole 12, further enhancing wear resistance and service life.

[0025] Furthermore, an annular reinforcing plate 18 is fixedly installed on the outer side of the first hinge hole 7 and the second hinge hole 9.

[0026] In this embodiment, the annular reinforcing plate 18 significantly enhances the structural strength at the first hinge hole 7 and the second hinge hole 9, effectively dispersing the enormous stress borne by the boom during operation. This not only reduces the risk of fatigue cracks around the hinge holes caused by long-term stress, but also extends the overall service life of the boom.

[0027] Furthermore, an elliptical weight-reducing hole 20 is provided in the non-stressed area in the middle of the boom body 1, and an annular reinforcing edge 19 is provided at the edge of the weight-reducing hole 20. The reinforcing edge is integrally stamped with the boom body 1.

[0028] In this embodiment, the design of the elliptical weight-reducing hole 20 effectively reduces the overall weight of the boom body 1, which not only reduces the excavator's energy consumption but also improves its operational flexibility. Simultaneously, the annular reinforcing edge 19, while reducing weight, ensures that the strength of the boom body 1 near the weight-reducing hole is not affected.

[0029] Working Principle: During excavator operation, the boom body 1, as the main load-bearing component, is hinged to other components through the first hinge 6 and the second hinge 8, enabling flexible boom rotation. When the excavator performs digging, lifting, or other actions, the boom body 1 bears enormous stress and impact. At this time, the reinforcing ribs 13 inside the boom body 1 come into play. They are spaced along the length and are specifically reinforced according to the stress conditions of different parts, effectively dispersing the stress borne by the boom body 1 during operation and enhancing the structural stability. At the same time, the annular reinforcing plates 18 on the outer sides of the first hinge hole 7 and the second hinge hole 9 also significantly enhance the structural strength at the hinge hole, reducing the risk of fatigue cracks caused by long-term stress. The elliptical weight-reducing holes 20 in the non-stressed area in the middle of the boom body 1 reduce the overall weight of the boom while ensuring that the strength of the boom body 1 near the weight-reducing holes is not affected by the setting of the annular reinforcing edge 19. Furthermore, the wear-resistant liner 11 enhances the wear resistance of the mounting hole 12, effectively resisting wear caused by long-term friction. The combined use of the fixing structure and the positioning structure ensures the positional stability and positioning accuracy of the wear-resistant liner 11 within the mounting hole 12, preventing displacement or detachment of the wear-resistant liner 11 due to vibration or impact during operation.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An excavator boom, comprising a boom body (1), characterized in that: The boom body (1) adopts a box-shaped structure. The boom body (1) is formed by welding an upper cover plate (2), a lower cover plate (3), a left side plate (4), and a right side plate (5). The boom body (1) has a reinforcing structure inside. One end of the boom body (1) is provided with a first hinge part (6). The first hinge part (6) is composed of two sets of symmetrical connecting plates. The first hinge part (6) is integrally formed with the boom body (1). The first hinge part (6) is provided with a through first hinge hole (7). The other end of the boom body (1) is provided with a second hinge part (8). The second hinge part (8) is integrally formed with the boom body (1). The second hinge part (8) is provided with a through second hinge hole (9). The first hinge hole (7) and the second hinge hole (9) are provided with a detachable bushing assembly (10). The detachable bushing assembly (10) includes a wear-resistant inner liner (11) and a mounting hole (12).

2. The excavating boom according to claim 1, characterized in that: The reinforcing structure is a reinforcing rib (13). The reinforcing rib (13) is located inside the boom body (1) and is spaced along the length direction. The cross section of the reinforcing rib (13) is an isosceles triangle. The reinforcing rib (13) is located at the corner where the upper cover plate (2), lower cover plate (3), left side plate (4), and right side plate (5) are connected.

3. The excavating boom according to claim 2, characterized in that: The mounting holes (12) are respectively opened on the first hinge (6) and the second hinge (8), and the wear-resistant liner (11) is embedded in the mounting holes (12).

4. The excavating boom according to claim 3, characterized in that: A fixing structure is provided between the wear-resistant liner (11) and the mounting hole (12). The fixing structure includes a fixing bolt (14) and a bolt hole (15). The bolt hole (15) is respectively opened on the first hinge part (6) and the second hinge part (8). The fixing bolt (14) passes through the bolt hole (15) and abuts against the wear-resistant liner (11).

5. An excavating boom according to claim 4, characterized in that: A positioning structure is also provided between the wear-resistant liner (11) and the mounting hole (12). The positioning structure includes a positioning strip (16) fixedly disposed on the outer ring of the wear-resistant liner (11) and a positioning groove (17) opened on the inner wall of the mounting hole (12). The positioning strip (16) and the positioning groove (17) cooperate with each other.

6. The excavating boom according to claim 5, characterized in that: An annular reinforcing plate (18) is fixedly installed on the outer side of the first hinge hole (7) and the second hinge hole (9).

7. An excavating boom according to claim 6, characterized in that: The boom body (1) has an elliptical weight reduction hole (20) in the non-stressed area in the middle. The edge of the weight reduction hole (20) is provided with an annular reinforcing edge (19), which is integrally stamped with the boom body (1).

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