A pole structure

Abstract

This utility model belongs to the field of engineering machinery technology, specifically relating to a boom structure, including a side plate, a cover plate at the top of the side plate, a bottom plate at the bottom of the side plate, a bend in the cover plate, a first cover plate section on one side of the bend, and a second cover plate section on the other side of the bend. The angle θ formed by the wall of the first cover plate section and the bottom plate is not equal to the angle α formed by the wall of the second cover plate section and the bottom plate, ensuring a simple and reasonable height of the rear section while taking into account the overall strength of the boom.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, and in particular relates to a boom structure. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] Excavators are one of the main types of construction machinery. The stick, as a crucial component of the excavator's working device, plays a vital role in the entire excavation process. The stick, along with the boom, bucket, and platform, forms a complete working mechanism, ensuring the excavator can complete digging operations at varying heights and depths within a specific working range. Different working conditions in construction machinery have varying requirements for the working range. To meet customer needs, technicians configure and combine working devices according to different working ranges during the planning stage, designing multiple booms or sticks of different lengths to achieve variations in the working range. To ensure the versatility of excavator structural components, a common industry solution is to keep the boom constant while designing multiple sticks of different lengths, achieving different working ranges by assembling different sticks.

[0004] Currently, the industry generally adopts a bucket boom design that is smaller at the front and larger at the back, referring to... Figure 1 For existing standard boom structures, with a tapered front and rounded rear shape, the front axle seat is generally an angled forging or casting. Both forgings and castings are molded parts, making them difficult to modify once designed. When designing booms of different lengths, if the same front axle seat is used, the front angle is fixed, and the rear cross-section increases with boom length, resulting in excessively high overall strength at the rear of the boom and structural redundancy. Using front axle seats with different angles requires different molds or the largest possible mold for machining according to different angles, increasing costs. Furthermore, the large variety of front axle seat types increases management costs and poses a risk of using the wrong parts on the production line. Utility Model Content

[0005] In order to solve the above problems, this utility model proposes a pole structure. The technical problem to be solved by this utility model is...

[0006] According to some embodiments, the present invention adopts the following technical solution: This application discloses a bucket pole structure, including a side plate, a cover plate at the top of the side plate, a bottom plate at the bottom of the side plate, a bend in the cover plate, a first cover plate segment on one side of the bend, and a second cover plate segment on the other side of the bend. The angle θ formed by the wall of the first cover plate segment and the bottom plate is not equal to the angle α formed by the wall of the second cover plate segment and the bottom plate.

[0007] A further setting is made so that when the side plate is smaller than the standard value, the cover plate bends away from the bottom plate.

[0008] A further setting is that when the side plate is larger than the standard value, the cover plate bends towards the bottom plate.

[0009] Further configured, the bend is a circular arc transition plane.

[0010] The side plate is further configured such that it includes a front side plate, a middle side plate, and a rear side plate, with a first weld seam between the front side plate and the middle side plate, and a second weld seam between the rear side plate and the middle side plate.

[0011] A further configuration is provided, wherein a front axle seat is provided at the front end of the front side plate, and a central axle seat is provided at the center of the front side plate.

[0012] A further configuration is that the bend is located in the front half of the middle side plate.

[0013] A further configuration is provided, wherein a rear axle seat is provided at the rear end of the rear side plate, and a rear ear plate is provided at the end of the rear side plate.

[0014] A further configuration is provided with an upper ear plate at the top of the rear side plate.

[0015] Further configured, the dimensions of the front axle mount, the center axle mount, and the front side plate are fixed.

[0016] The beneficial effects of this utility model are as follows: When designing booms of different lengths, using the same front axle mount can greatly improve the versatility of the front axle mount and reduce its cost. Depending on the length of the boom, a large arc transition bending point is set in the middle of the boom cover plate or bottom plate to adjust the overall angle of the boom. The structural cross-section transition is smooth with low stress concentration, ensuring that the height of the rear cross-section is simple and reasonable while also taking into account the overall strength of the boom. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0018] Figure 1 This is a schematic diagram of the structure of an existing standard bucket boom; Figure 2 This is a schematic diagram of the extended bucket pole of this utility model; Figure 3 This is a schematic diagram of the shortened pole of this utility model.

[0019] Figure label: 1. Side panel; 11. Front side panel; 12. Middle side panel; 13. Rear side panel; 2. Cover plate; 21. First cover plate section; 22. Second cover plate section; 3. Base plate; 4. Bend; 5. First weld seam; 6. Second weld seam; 7. Front axle seat; 8. Middle axle seat; 9. Rear axle seat; 10. Upper ear plate; 11. Rear ear plate. Detailed Implementation The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] Example 1 A pole structure, referring to Figure 1 The side plate 1 is of standard length. The purpose of this embodiment is to ensure that when the side plate 1 of standard length is lengthened or shortened, the bearing seat size remains unchanged, while maintaining overall strength, by setting the bend 4. (Refer to...) Figure 2 and Figure 3 The structure includes a side plate 1, a cover plate 2 at the top of the side plate 1, a bottom plate 3 at the bottom of the side plate 1, a bend 4 in the cover plate 2, a first cover plate segment 21 on one side of the bend, and a second cover plate segment 22 on the other side of the bend. The angle θ formed by the wall of the first cover plate segment 21 and the bottom plate 3 is not equal to the angle α formed by the wall of the second cover plate segment 22 and the bottom plate 3. By setting bend cover plates 2 with different angles (θ ≠ α), the adjustable angle of the main body of the boom is achieved. This allows for adapting to different boom length requirements simply by changing the bending angle of the cover plate 2, while maintaining the complete universality of the front axle seat 7. Compared to traditional solutions that require changing the angle of the front axle seat 7 or the overall cross-section, this structure completely avoids material redundancy and weight increase caused by excessive enlargement of the rear cross-section due to boom lengthening, while ensuring strength matching for booms of different lengths.

[0022] Side plate 1 can be shortened. When the stick needs to be shortened, the length of side plate 1 is less than the standard value, and the bend 4 bends away from the bottom plate 3 (that is, the angle between the cover plate and the bottom plate increases from θ to β).

[0023] This design allows the overall posture of the boom to be more "straight" or "downward." Its core advantage lies in effectively preventing the problem of excessive strength in the rear section of the boom caused by using the same cross-sectional dimensions as a long boom, when the boom length is shortened, the required digging depth is relatively shallower, or the working range changes. By bending downward, the force transmission path and cross-sectional stress distribution of the short boom are optimized, achieving structural lightweighting while meeting strength requirements.

[0024] Side plate 1 can be extended. When the boom needs to be lengthened, the length of side plate 1 exceeds the standard value, and the bend 4 bends towards the bottom plate 3 (i.e., the angle between the cover plate and the bottom plate decreases from θ to α). This design makes the overall posture of the boom more "upward". Its core advantage is that when the boom length is increased and a larger digging range or digging height is pursued, the upward bend effectively compensates for the risk of insufficient structural rigidity in the rear section that may be caused by the fixed angle and length extension of the front axle seat 7. It ensures that the rear section of the extended boom can still maintain the necessary cross-sectional height and rigidity to withstand the increased bending moment load, while avoiding the disadvantages of having to use a larger front axle seat 7 or enlarge the overall cross-section to adapt to the longer boom, accurately matching the strength requirements under extended working conditions.

[0025] The bending point 4 is a circular arc transition plane. Using a circular arc transition plane for bending has a significant stress dispersion advantage compared to right-angle bending or small-radius bending. The circular arc transition can significantly reduce the peak stress in the bending area (high stress concentration risk area), effectively inhibiting the initiation and propagation of fatigue cracks, thereby significantly improving the fatigue life and structural reliability of the critical connection area of ​​the boom.

[0026] The side plate 1 includes a front side plate 11, a middle side plate 12 and a rear side plate 13. A first weld seam 5 is provided between the front side plate 11 and the middle side plate 12, and a second weld seam 6 is provided between the rear side plate 13 and the middle side plate 12. The side plate 1 is divided into three sections: front, middle and rear. The first weld seam 5 and the second weld seam 6 are provided at the connection. The weld seams facilitate the welding and assembly of the front side plate 11, the middle side plate 12 and the rear side plate 1 after assembly.

[0027] The front axle seat 7 is set at the front end of the front side plate 11, and the center axle seat 8 is set at the center of the front side plate 11. The center axle seat 8 ensures the absolute universality of the key interface connecting with the boom and bucket cylinder. No matter how the stick length changes, the size, position and connection relationship of the front axle seat 7 and the center axle seat 8 remain unchanged, so that sticks of different lengths can be seamlessly adapted to the same boom and cylinder system, which greatly simplifies the overall machine configuration, assembly process and spare parts management.

[0028] The bend 4 is located in the front half of the middle side plate 12, in the front of the middle section. It can more effectively affect the overall attitude of the boom through local angle changes, and achieve the required working range adjustment with minimal structural modifications. It avoids the connection points that directly bear high loads, such as the front axle seat 7 and the middle axle seat 8. By arranging the bend in a section with relatively stable stress, the risk of failure of the bend area under high load is reduced, and the integrity of key connection parts is ensured.

[0029] The rear axle seat 9 is provided at the rear end of the rear side plate 13, and the rear ear plate 11 is provided at the end of the rear side plate 13. The design of the rear axle seat 9 (usually connected to the boom cylinder) and the rear ear plate 11 (connected to the platform) can remain relatively stable or standardized, ensuring that booms of different lengths can be reliably and compatiblely connected to the same model of excavator boom, further improving the universality and interchangeability of the whole machine components.

[0030] The top of the rear side plate 13 is provided with an upper ear plate 10, which can be used to target the bucket cylinder.

[0031] The front axle seat 7, the middle axle seat 8, and the front side plate 11 have relatively fixed structural dimensions, which ensures the interchangeability of the connection points between the stick and the bucket and rocker arm of different lengths, further improving the versatility of the stick.

[0032] When designing the extended stick, (1) the outlines of the front axle seat 7, the middle axle seat 8 and the front side plate 11 remain unchanged. To ensure the requirements of the combined jacking point, the position of the middle axle seat 8 may need to be adjusted appropriately; (2) according to the length requirements of the stick, the rear axle seat 9 and the rear ear plate 11 are moved backward, and the bottom plate 3 is also lengthened accordingly; (3) a bending point is set in the middle part of the cover plate 2 and the middle side plate 12. The bending point is designed with a large arc to smoothly transition in order to reduce the stress concentration of the structure. The angle θ at the bending point is greater than α, so that the angle of the rear section of the stick is reduced. By adjusting the size of the α angle, the height of the rear section of the cover plate 2 can be adjusted to be close to that of the standard stick. The corresponding upper ear plate 10, the middle side plate 12 and the rear side plate 13 are adjusted according to the modified outlines of the cover plate 2 and the bottom plate 3.

[0033] When designing to shorten the boom, (1) the outlines of the front axle seat 7, the middle axle seat 8 and the front side plate 11 remain unchanged. To ensure the requirements of the combined boom, the position of the middle axle seat 8 may need to be adjusted appropriately; (2) according to the length requirements of the boom, the rear axle seat 9 and the rear ear plate 11 are moved forward, and the bottom plate 3 is also shortened accordingly; (3) a bending point is set in the middle of the cover plate 2 and the middle side plate 12. The bending point is designed with a large arc to smoothly transition in order to reduce the stress concentration of the structure. The angle θ at the bending point is less than β, so that the angle of the rear section of the boom is increased. By adjusting the size of the β angle, the height of the rear section of the cover plate 2 can be adjusted to be close to that of the standard boom. The corresponding upper ear plate 10, the middle side plate 12 and the rear side plate 13 are adjusted according to the modified outlines of the cover plate 2 and the bottom plate 3.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0035] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. 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 solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A boom structure characterized by, The device includes a side plate, a cover plate at the top of the side plate, a bottom plate at the bottom of the side plate, a bend in the cover plate, a first cover plate segment on one side of the bend, and a second cover plate segment on the other side of the bend. The angle θ formed by the wall of the first cover plate segment and the bottom plate is not equal to the angle α formed by the wall of the second cover plate segment and the bottom plate.

2. A stick structure as claimed in claim 1, characterized in that When the side plate is smaller than the standard value, the cover plate bends away from the bottom plate.

3. The pole structure as described in claim 1, characterized in that, When the side plate is larger than the standard value, the cover plate bends towards the bottom plate.

4. The pole structure as described in claim 1, characterized in that, The bend is a circular arc transition plane.

5. The pole structure as described in claim 1, characterized in that, The side plate includes a front side plate, a middle side plate, and a rear side plate. A first weld seam is provided between the front side plate and the middle side plate, and a second weld seam is provided between the rear side plate and the middle side plate.

6. The pole structure as described in claim 5, characterized in that, A front axle mount is provided at the front end of the front side plate, and a center axle mount is provided at the center of the front side plate.

7. A pole structure as described in claim 1 or claim 5, characterized in that, The bend is located in the front half of the middle side plate.

8. The pole structure as described in claim 5, characterized in that, A rear axle seat is provided at the rear end of the rear side plate, and a rear ear plate is provided at the end of the rear side plate.

9. A pole structure as described in claim 5, characterized in that, An upper ear plate is provided at the top of the rear side plate.

10. A pole structure as described in claim 5, characterized in that, The dimensions of the front axle mount, center axle mount, and front side plate are fixed.

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