A symmetrical excavator boom arm head

Abstract

This utility model aims to solve the problems of uneven stress distribution and structural instability in existing excavator boom heads, and provides a symmetrical excavator boom head. The boom head includes a U-shaped curved plate fixed to the front end of the boom, with a base plate inside the U-shaped opening forming a boom head mounting opening with a clamping part. Two side frame assemblies are symmetrically installed on both sides of the U-shaped curved plate. Each side frame assembly has an inner side plate, an outer side plate, and a reinforcing plate; some embodiments also include an inner ring plate. Each plate has corresponding through holes. A pin passes through the through holes and connects to the excavator stick. The clamping part of the inner side plate engages with the U-shaped curved plate's locking slot, enhancing connection stability. One end of the pin has a connecting plate, the extension of which is pressed by a pressure plate and a nut block, restricting the pin's movement and rotation. This structure ensures uniform stress distribution, avoids concentration, improves overall strength, reliability, and stability, and enhances the excavator's working performance.

Description

Technical Field

[0001] This utility model relates to the field of excavator boom head technology, specifically a symmetrical excavator boom head. Background Technology

[0002] In excavator operations, the boom head is a critical component bearing complex and enormous loads, and its performance directly affects the excavator's overall working efficiency and safety. However, existing excavator boom head structures have several problems that urgently need to be addressed. Some boom head structures lack rational design, resulting in extremely uneven stress distribution when bearing various loads during excavator operation, easily leading to stress concentration. For example, the connection design between some boom head side frame components and the main structure is not scientifically sound, failing to effectively distribute the enormous loads and causing excessive local stress. Under long-term, high-intensity working conditions, this excessive local stress can easily lead to structural damage, significantly shortening the boom head's service life, thereby increasing excavator maintenance costs and downtime, and adversely affecting normal excavator operation. Therefore, improving the boom head structure is essential. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the above-mentioned technical defects and provide a symmetrical excavator boom head.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a symmetrical excavator boom head, comprising:

[0005] U-shaped bend plate, which is fixed to the front end of the boom;

[0006] Two side frame assemblies are symmetrically mounted on both sides of the U-shaped bend, each side frame assembly comprising:

[0007] The inner side plate is welded to the side of the U-shaped bend plate, and the end of the inner side plate is provided with a pin hole;

[0008] An outer side plate is welded to the outside of the inner side plate, and the end of the outer side plate is provided with a first through hole coaxial with the pin hole;

[0009] A reinforcing plate is welded to the outside of the outer plate, and the reinforcing plate is provided with a second through hole coaxial with the pin hole;

[0010] A pin, passing through the pin holes, first through hole, and second through hole of the side frame assemblies on both sides, is used to connect the stick of the excavator.

[0011] As a preferred embodiment of this application, each of the side frame assemblies further includes an inner ring plate;

[0012] The inner ring plate is welded to the inside of the outer plate, and the end of the pin passes through the center hole, the pin hole, the first through hole and the second through hole of the inner ring plate from the inside to the outside.

[0013] As a preferred embodiment of this application, the front and rear ends of both sides of the U-shaped bend are provided with latches, and the bottom sides of the inner side plate near the U-shaped bend are tapered inward to form a clamping part, and the two ends of the clamping part are engaged in the two latches on the same side of the U-shaped bend.

[0014] As a preferred embodiment of this application, a bottom plate is provided inside the U-shaped opening of the U-shaped bending plate, and a boom head mounting opening is formed between the bottom plate, the U-shaped bending plate, and the clamping parts on both sides, and the boom head mounting opening is used for mounting on the front end of the boom.

[0015] As a preferred embodiment of this application, one end of the pin is fixed with a connecting plate located outside the reinforcing plate. One end of the connecting plate has an integrally formed extension. A nut block is provided on the outer side of the reinforcing plate. A pressure plate is installed on the nut block by bolts. The extension of the connecting plate is pressed between the pressure plate and the nut block. The pressure plate is used to restrict the axial movement and circumferential rotation of the pin.

[0016] As a preferred embodiment of this application, the nut block is welded to the outer side of the reinforcing plate.

[0017] The boom head structure of this application, which improves boom welding stress, has significant advantages. In terms of structural design, the U-shaped bend plate, base plate, and clamping part form a precisely fitted mounting opening at the boom front end, enhancing installation stability. Two side frame assemblies are symmetrically installed on both sides of the U-shaped bend plate, ensuring uniform stress distribution when the boom head bears complex loads, avoiding stress concentration, improving boom welding stress issues, and enhancing overall strength and reliability. The connection design of each component in the side frame assembly is ingenious; for example, the clamping structure of the inner side plate enhances the connection stability with the U-shaped bend plate, and the inner ring plate disperses the force on the pin. The pin and related component structure effectively restrict pin movement and rotation, ensuring the excavator's working accuracy and stability. Through innovative design, the overall structure solves problems such as uneven stress distribution and structural instability in existing technologies, improving boom head performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a symmetrical excavator boom head according to this application;

[0019] Figure 2 This is a structural schematic diagram of a symmetrical excavator boom head removal pin according to this application;

[0020] Figure 3 This is a side sectional view of the boom head of a symmetrical excavator according to this application.

[0021] As shown in the figure: 1. Reinforcing plate, 2. Outer plate, 3. Inner plate, 31. Clamping part, 4. Nut block, 5. U-shaped bent plate, 51. Bayonet, 6. Base plate, 7. Inner ring plate, 8. Connecting plate, 9. Pin, 10. Pressure plate, 11. Bolt. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0024] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0025] To make the content of this utility model easier to understand, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0026] See attached document Figure 1 -Appendix Figure 3 To solve the above-mentioned technical problems, the large excavator boom head structure for improving boom welding stress provided by this utility model mainly includes a U-shaped bending plate 5, two side frame assemblies, a base plate 6, a pin shaft 9, a connecting plate 8, a pressure plate 10, a nut block 4, and bolts 11, etc.

[0027] The U-shaped bend plate 5 is fixed to the front end of the boom, providing basic support for the entire boom head structure. A base plate 6 is located inside the U-shaped opening. The base plate 6, the U-shaped bend plate 5, and the clamping parts 31 on both sides form a boom head mounting opening. This mounting opening precisely fits the front end of the boom, ensuring a stable installation and providing a stable platform for the installation of subsequent components, effectively improving the stability of the entire boom structure during use.

[0028] Two side frame assemblies are symmetrically installed on both sides of the U-shaped bend plate 5. This symmetrical structural design has significant advantages. From a mechanical point of view, the symmetrical structure enables a more uniform stress distribution when the boom head bears various complex loads during the excavator's operation, avoiding stress concentration. This effectively improves the welding stress problem of the boom, greatly enhances the overall strength and reliability of the boom head structure, and extends its service life.

[0029] Each side frame assembly includes an inner side plate 3, an outer side plate 2, a reinforcing plate 1, and an inner ring plate 7 (in some embodiments). The inner side plate 3 is welded to the side of the U-shaped bend plate 5, and its end is provided with a pin hole to provide precise positioning for the installation of the pin 9. The bottom sides of the inner side plate 3 near the U-shaped bend plate 5 taper inward to form a locking part 31. The front and rear ends of both sides of the U-shaped bend plate 5 are provided with slots 51, and the two ends of the locking part 31 are locked into the two slots 51 on the same side of the U-shaped bend plate 5. This locking structure design makes the connection between the inner side plate 3 and the U-shaped bend plate 5 more stable, effectively resisting various external forces during the operation of the excavator, preventing relative displacement between the inner side plate 3 and the U-shaped bend plate 5, and further enhancing the stability of the boom head structure.

[0030] The outer side plate 2 is welded to the outside of the inner side plate 3. Its end has a first through hole coaxial with the pin hole of the inner side plate 3. This coaxial design ensures that the pin 9 can pass through smoothly, achieving precise connection between the components. The reinforcing plate 1 is welded to the outside of the outer side plate 2. The reinforcing plate 1 has a second through hole coaxial with the pin hole. The setting of the reinforcing plate 1 further enhances the overall strength of the side frame assembly, effectively withstanding the huge load generated during the excavator's operation and preventing deformation or damage to the side frame assembly.

[0031] In one embodiment, each side frame assembly further includes an inner ring plate 7, which is welded to the inside of the outer side plate 2. The end of the pin 9 passes through the center hole, pin hole, first through hole, and second through hole of the inner ring plate 7 sequentially from the inside to the outside. The inner ring plate 7 serves to distribute stress. When the pin 9 is subjected to axial and circumferential forces, the inner ring plate 7 can evenly transfer these forces to the outer side plate 2, avoiding structural damage caused by excessive local stress and further improving the reliability of the arm head structure.

[0032] The pin 9 passes through the pin holes, first through holes, and second through holes of the side frame assemblies on both sides, and is used to connect the excavator's stick. It is a key component for power transmission and motion conversion in the entire boom structure. One end of the pin 9 is fixed to a connecting plate 8 located outside the reinforcing plate 1, and one end of the connecting plate 8 has an integrally formed extension. A nut block 4 is provided on the outer side of the reinforcing plate 1, and the nut block 4 is welded to the outer side of the reinforcing plate 1 to ensure a firm connection. A pressure plate 10 is installed on the nut block 4 by bolts 11, and the extension of the connecting plate 8 is pressed between the pressure plate 10 and the nut block 4. This structural design can effectively limit the axial movement and circumferential rotation of the pin 9, ensuring that the pin 9 remains stable during operation, thereby ensuring that the excavator's stick can move accurately as expected, improving the excavator's working accuracy and stability.

[0033] In the manufacturing process of the boom head of this application, a process of first welding the components together and then welding the whole assembly is adopted. Specifically, the reinforcing plate 1, outer plate 2, inner plate 3, and inner ring plate 7 are first welded together to form a component, which is then welded together with the U-shaped bend plate 5 and the base plate 6. Finally, the reinforcing plate 1 and the nut block 4 are welded together. This step-by-step welding process can better control the welding quality and reduce welding deformation. During the welding process, the holes and inner end faces of the inner ring plate are post-weld machined to ensure assembly accuracy, enabling precise matching between the components and improving the overall performance of the boom head structure.

[0034] Regarding the welding sequence, a symmetrical welding structure was adopted to avoid the welds being located in areas of concentrated stress. Simultaneously, the addition of fillet welds to the bent plate 5 and the two inner side plates 3 further enhanced the connection strength of the structure. Argon arc welding was used to add weld toe treatment to the weld bead between the inner side plate 3 and the U-shaped bent plate 5, reducing stress concentration caused by excess weld height and improving weld strength. This treatment method resulted in a smooth transition between the base material and the weld, effectively reducing the risk of weld cracking due to impact on the arm head.

[0035] In terms of welding equipment, robotic cross welding is adopted, which has many advantages. (1) The arm head is designed with a symmetrical structure. After the welding sequence is reasonably arranged, robotic cross welding can accurately control the welding parameters and welding path, effectively offset welding deformation, reduce the shaping process, and thus reduce production costs. (2) Through robotic cross welding, the consistency and stability of welding quality can be guaranteed, the product qualification rate can be improved, and the overall performance of the arm head structure can be further improved.

[0036] In summary, the boom head structure of this utility model, which improves the welding stress of the boom, effectively improves the welding stress problem of the boom through its unique structural design, reasonable component connection method, and advanced welding process. It enhances the strength, reliability, and stability of the boom head structure, reduces production costs, and has significant technical and economic benefits.

[0037] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A symmetrical excavator boom head, characterized in that, include: U-shaped bend plate (5), which is fixed to the front end of the boom; Two side frame assemblies are symmetrically installed on both sides of the U-shaped bend (5), each side frame assembly comprising: The inner side plate (3) is welded to the side of the U-shaped bent plate (5), and the end of the inner side plate (3) is provided with a pin hole; The outer side plate (2) is welded to the outside of the inner side plate (3), and the end of the outer side plate (2) is provided with a first through hole coaxial with the pin hole; A reinforcing plate (1) is welded to the outside of the outer plate (2), and the reinforcing plate (1) is provided with a second through hole coaxial with the pin hole; The pin (9) passes through the pin hole, the first through hole and the second through hole of the side frame assembly on both sides, and is used to connect the stick of the excavator; Both ends of the U-shaped bend plate (5) are provided with slots (51). The inner side plate (3) is located near the bottom of the U-shaped bend plate (5) and the two sides of the bottom are contracted inward to form a clamping part (31). The two ends of the clamping part (31) are clamped in the two slots (51) on the same side of the U-shaped bend plate (5).

2. The symmetrical excavator boom head according to claim 1, characterized in that: Each of the side frame assemblies also includes an inner ring plate (7), which is welded to the inside of the outer side plate (2), and the end of the pin (9) passes through the center hole, pin hole, first through hole and second through hole of the inner ring plate (7) from the inside to the outside.

3. The symmetrical excavator boom head according to claim 1, characterized in that: The U-shaped opening of the U-shaped bend plate (5) is provided with a base plate (6), and the base plate (6) forms a boom head mounting opening between the U-shaped bend plate (5) and the clamping parts (31) on both sides. The boom head mounting opening is used to install on the front end of the boom.

4. The symmetrical excavator boom head according to claim 1, characterized in that: One end of the pin (9) is fixed with a connecting plate (8) located outside the reinforcing plate (1). One end of the connecting plate (8) is integrally formed with an extension. The outer side of the reinforcing plate (1) is provided with a nut block (4). A pressure plate (10) is installed on the nut block (4) by bolts (11). The extension of the connecting plate (8) is pressed between the pressure plate (10) and the nut block (4). The pressure plate (10) is used to restrict the axial movement and circumferential rotation of the pin (9).

5. The symmetrical excavator boom head according to claim 4, characterized in that: The nut block (4) is welded to the outer side of the reinforcing plate (1).

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