A boom reinforcing plate structure and a shovel
By incorporating a combination of internal stiffening plates and reinforcing plates in the middle section of the excavator boom, the problem of stress concentration in the boom was solved, the bending stiffness and fatigue life of the structure were improved, the risk of weld cracking was reduced, and safety was ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO LOVOL EXCAVATOR
- Filing Date
- 2025-06-16
- Publication Date
- 2026-05-29
Smart Images
Figure CN224300065U_ABST
Abstract
Description
Technical Field
[0001] This disclosure pertains to the field of excavator boom technology, and more specifically relates to a boom reinforcement plate structure and an excavator. Background Technology
[0002] The statements herein provide only background information in relation to this disclosure and do not necessarily constitute prior art.
[0003] Excavators are a common type of construction machinery, widely used in construction, road, and mining projects, primarily for excavation operations.
[0004] Existing excavators typically consist of a bucket, a stick, and a boom. Under the action of the drive unit, these three components swing back and forth around the hinge point to perform digging operations. The boom, as the main component of the backhoe, is directly connected to the main frame of the excavator. Common booms usually adopt a box-type structure, and internal stiffening plates are installed inside the box and at the hinge shaft to improve the stress on the boom.
[0005] The existing boom reinforcement structure typically involves adding wing plates to the outer side plates of the boom for reinforcement. However, it rarely considers the internal stiffening plates installed between the boom center axle seat, side plates, and top cover plate. Welding these internal stiffening plates to the top cover plate increases stress during use, resulting in insufficient structural strength. Under high-intensity use, the boom may crack, leading to damage. Increased welding stress at the internal stiffening plates between the boom center axle seat, side plates, and top cover plate shortens the boom's service life. Furthermore, prolonged operation can cause weld cracks to propagate, leading to fractures that separate from the main unit, potentially injuring on-site workers and causing accidents during operation. Utility Model Content
[0006] The purpose of this disclosure is to provide a boom reinforcement plate structure and an excavator that can at least solve one of the above-mentioned technical problems.
[0007] To achieve the above objectives, one or more embodiments of this disclosure provide a boom reinforcement plate structure. The boom is a box-type structure, including two boom side plates, a boom upper cover plate, and a boom lower cover plate. An ear plate is provided on the boom upper cover plate, and the ear plate is located in the middle section of the boom. One side of the middle section of the boom is the front section of the boom, and the other side is the rear section of the boom. A boom center shaft seat is provided on the middle section of the boom. Inner stiffening plates are provided between the two boom side plates and between the boom center shaft seat and the boom upper cover plate. A reinforcing plate is provided on the surface of the inner stiffening plate at the connection position with the boom upper cover plate.
[0008] Furthermore, the inner stiffening plate is arranged parallel to the axis of the boom center shaft seat.
[0009] Furthermore, the two sides of the inner stiffening plate are also connected to the boom side plate.
[0010] Furthermore, the inner stiffening plate includes a first inner stiffening plate and a second inner stiffening plate. The upper and lower sides of the first inner stiffening plate are connected to the upper cover plate of the boom and the lower cover plate of the boom. The upper and lower sides of the second inner stiffening plate are connected to the upper cover plate of the boom and the boom center shaft seat.
[0011] Furthermore, the reinforcing plate is spatially perpendicular to the inner stiffening plate and is disposed on the upper and lower sides of the boom cover plate.
[0012] Furthermore, the reinforcing plate includes a first reinforcing plate, a second reinforcing plate, and a third reinforcing plate. The first and third reinforcing plates are symmetrically arranged on the side of each ear plate near the boom side plate, and the second reinforcing plate is arranged between the two ear plates.
[0013] Furthermore, the tail sections of the first and third reinforcing plates are configured as airfoil structures.
[0014] Furthermore, the tail of the second reinforcing plate is configured with a V-shaped structure.
[0015] Furthermore, the ear plates are symmetrically arranged on the upper cover plate of the boom.
[0016] Another aspect of this disclosure provides an excavator that includes the boom reinforcement plate structure described above.
[0017] The beneficial effects of one or more of the above technical solutions are as follows:
[0018] This disclosure improves the bending stiffness of the middle section of the boom by forming a support system with reinforcing plates and inner stiffening plates, thereby guiding the stress dispersion path, reducing the stress peak in the welding area, and effectively avoiding the weld cracking problem caused by stress concentration in traditional structures. By guiding the stress dispersion path, the fatigue life of the boom is extended, and the fracture accident rate under high load conditions is significantly reduced. Attached Figure Description
[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.
[0020] Figure 1 This is a front view of the overall structure in one or more embodiments of this disclosure;
[0021] Figure 2 This is a top view of the overall structure in one or more embodiments of this disclosure;
[0022] Figure 3 This is a schematic diagram of the longitudinal adjustment mechanism in one or more embodiments of this disclosure.
[0023] In the figure, 1. Ear plate; 2. Upper cover plate of boom; 3. Side plate of boom; 4. Lower cover plate of boom; 5. Front section of boom; 6. Middle section of boom; 7. Rear section of boom; 8. Bollard center shaft seat; 9. First reinforcing plate; 10. Second reinforcing plate; 11. Third reinforcing plate; 12. First inner stiffening plate; 13. Second inner stiffening plate. Detailed Implementation
[0024] like Figures 1-3 As shown, this embodiment provides a boom reinforcement plate structure and an excavator. The boom is a box-type structure, including two boom side plates 3, a boom upper cover plate 2 and a boom lower cover plate 4. The boom includes a boom rear section 7, a boom middle section 6 and a boom front section 5. Ear plates 1 are set on the boom upper cover plate 2 of the boom middle section 6, and a boom center shaft seat 8 is set on the boom middle section 6.
[0025] like Figure 2 As shown, the upper cover plate 2 of the boom is symmetrically provided with ear plates 1 and reinforcing plates. The ear plates 1 and the upper cover plate 2 of the boom are arranged perpendicularly. The reinforcing plates include a first reinforcing plate 9, a second reinforcing plate 10 and a third reinforcing plate 11. The first reinforcing plate 9 and the third reinforcing plate 11 are symmetrically arranged on the side of each ear plate 1 near the boom side plate 3, which helps to evenly distribute the force generated during operation, thereby improving the load-bearing capacity of the entire structure. The second reinforcing plate 10 is arranged between the two ear plates 1, which further strengthens the overall strength of the upper cover plate 2 of the boom.
[0026] The tails of the first reinforcing plate 9 and the third reinforcing plate 11 are designed with airfoil structures, which can effectively reduce air resistance and improve working efficiency; the tail of the second reinforcing plate 10 is designed with a V-shaped structure, which helps to guide the fluid smoothly and reduce turbulence and resistance.
[0027] like Figure 3 As shown, internal stiffening plates are provided between the two boom side plates 3 and between the boom center axle seat 8 and the boom top cover plate 2. Reinforcing plates are provided on the surface of the connection between the internal stiffening plates and the boom top cover plate 2. The reinforcing plates can provide additional structural strength. The internal stiffening plates are set parallel to the axis of the boom center axle seat 8, which ensures the overall symmetry and uniform stress. The two sides of the internal stiffening plates are also connected to the boom side plates 3, which further enhances the stability and durability of the entire structure.
[0028] Specifically, the inner stiffening plates include a first inner stiffening plate 12 and a second inner stiffening plate 13. The upper and lower sides of the first inner stiffening plate 12 are connected to the upper cover plate 2 of the boom and the lower cover plate 4 of the boom, ensuring the stability and strength of the structure. The upper and lower sides of the second inner stiffening plate 13 are connected to the upper cover plate 2 of the boom and the central shaft seat 8 of the boom, further enhancing the overall structure of the boom. The reinforcing plate is perpendicular to the space of the inner stiffening plates and is set on the upper and lower sides of the upper cover plate 2 of the boom. It is perpendicular to the space of the inner stiffening plates, which not only improves the rigidity of the structure, but also ensures the stability when bearing heavy loads.
[0029] This embodiment also provides an excavator, including the above-described boom reinforcement plate structure.
[0030] The working principle of this utility model:
[0031] During excavator operation, the load borne by the boom mid-section 6 is transferred to the reinforcing plate through the connection area between the lug plate 1 and the boom upper cover plate 2 of the boom mid-section 6. The first reinforcing plate 9 and the third reinforcing plate 11 are symmetrically distributed between the lug plate 1 and the boom side plate 3. Their airfoil tails reduce air turbulence through streamlined design, while uniformly distributing stress along the side plate direction. The second reinforcing plate 10 uses a V-shaped tail to connect the two lug plates 1, reducing fluid resistance through geometric flow guidance. The longitudinally arranged inner stiffener connects the boom upper cover plate 2, the boom lower cover plate 4, and the boom center axle seat 8, realizing effective transmission of axial load. The transverse reinforcing plate enhances local shear resistance through vertical welding, reducing the stress peak in the welded area of the boom mid-section 6. When the boom is subjected to impact load, the composite reinforcement structure of the reinforcing plate and the inner stiffener can guide the stress to diffuse along a preset path to the side plate and the boom center axle seat 8, avoiding stress concentration in the weak weld area of the traditional structure, thereby effectively inhibiting crack initiation and propagation and ensuring structural integrity under high load conditions.
[0032] While the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.
Claims
1. A boom reinforcement plate structure, wherein the boom is a box-type structure, characterized in that, It includes two boom side plates, a boom upper cover plate, and a boom lower cover plate; the boom upper cover plate is provided with a lug plate, the lug plate is located in the middle section of the boom, one side of the middle section of the boom is the front section of the boom, and the other side is the rear section of the boom. A boom center shaft seat is provided on the middle section of the boom. Inner stiffening plates are provided between the two boom side plates and between the boom center shaft seat and the boom upper cover plate. A reinforcing plate is provided on the surface of the inner stiffening plate at the connection position with the boom upper cover plate.
2. The boom reinforcing plate structure according to claim 1, characterized in that, The inner stiffening plate is set parallel to the axis of the boom center axle seat.
3. The boom reinforcing plate structure according to claim 1, characterized in that, The inner stiffening plate is also connected to the boom side plate on both sides.
4. The boom reinforcing plate structure according to claim 1, characterized in that, The inner stiffening plate includes a first inner stiffening plate and a second inner stiffening plate. The upper and lower sides of the first inner stiffening plate are connected to the upper cover plate of the boom and the lower cover plate of the boom. The upper and lower sides of the second inner stiffening plate are connected to the upper cover plate of the boom and the central shaft seat of the boom.
5. The boom reinforcing plate structure according to claim 1, characterized in that, The reinforcing plate is perpendicular to the inner stiffening plate and is located on the upper and lower sides of the boom cover plate.
6. The boom reinforcing plate structure according to claim 1, characterized in that, The reinforcing plate includes a first reinforcing plate, a second reinforcing plate, and a third reinforcing plate. The first and third reinforcing plates are symmetrically arranged on the side of each ear plate near the boom side plate, and the second reinforcing plate is arranged between the two ear plates.
7. A boom reinforcing plate structure according to claim 6, characterized in that, The tail sections of the first and third reinforcing plates are configured as airfoil structures.
8. A boom reinforcing plate structure according to claim 6, characterized in that, The tail of the second reinforcing plate is designed with a V-shaped structure.
9. The boom reinforcing plate structure according to claim 1, characterized in that, The ear plates are symmetrically arranged on the upper cover plate of the boom.
10. An excavator, characterized in that, The boom reinforcement plate structure includes any one of the claims 1-9 above.