Movable arm of excavator

Abstract

A movable arm of an excavator comprises a cover plate and a wall plate, the cover plate and the wall plate form a pipe body, and the front end and the rear end of the pipe body are connected with a large arm fork and a seat sleeve respectively. A bevel edge is arranged at the end of the wallboard, an arc edge is arranged at the end of the cover plate, and a concave point is arranged at the junction of the bevel edge and the arc edge. The large arm fork comprises a top plate, a bottom plate and side plates, the top plate, the bottom plate and the side plates form a large arm fork body, a first reinforcing rod and a second reinforcing rod are arranged in the large arm fork body, and the middle of the first reinforcing rod and the middle of the second reinforcing rod are connected in a welded mode to form an X-shaped structure. The special-shaped welding edges play a role in dispersing stress, the top plate, the bottom plate and the side plates form the large arm fork and the seat sleeve, the light weight effect is achieved, the crossed reinforcing ribs are arranged in the large arm fork, the integrity of the pin sleeves on the two sides is improved, and when the large arm fork is subjected to torsion, the stress is transmitted to the other side through the reinforcing ribs, so that the large arm fork is prevented from being damaged. Therefore, the possibility of tearing caused by torsion is reduced, and the product failure rate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of excavators, in particular to an excavator boom. Background Art

[0002] The boom and stick refer to the working devices of an excavator, often called the arm and forearm. Their primary function is to control the bucket's digging, loading, and other movements. The arm connected to the frame is longer, commonly known as the boom, and technically called the boom. The arm connected to the bucket is smaller, commonly known as the forearm, and technically called the stick, so they are commonly referred to as the big and small arms.

[0003] The boom of a backhoe excavator is generally curved, which allows for better forced excavation of soil below the parking surface. A face shovel, on the other hand, is generally straight, which allows for better forced excavation of soil above the parking surface. Its structure is generally box-shaped, with the upper and lower panels being the cover plates, the two side panels being the wall panels, the boom seat sleeve connecting to the frame, the boom middle sleeve connecting to the boom cylinder rod, the middle cylinder ear seat connecting to the middle cylinder, and the boom clip connecting to the forearm.

[0004] Since the structure of the boom is relatively stable, most of the structures are not prone to failure in actual use. However, since the boom and the dipper arm are both rod-shaped structures, their internal torsional resistance is relatively weak. When the bucket is affected by torque, the amplifying effect of the dipper arm causes the boom to be subjected to greater torque, resulting in tearing failure. Utility Model Content

[0005] One advantage of the present invention is that it provides an excavator boom, which disperses stress through special-shaped welded edges, and forms a large arm pin and a seat cover through a top plate, a bottom plate and a side plate, thereby achieving a lightweight effect. Cross reinforcement ribs are arranged inside the large arm pin to improve the integrity of the pin sleeves on both sides. When subjected to torsion, the stress is transferred to the other side through the reinforcement ribs, thereby reducing the possibility of tearing due to torsion and reducing the product failure rate.

[0006] To achieve at least one of the above advantages of the present invention, the present invention provides an excavator boom, comprising a cover plate and a wall plate, the cover plate and the wall plate forming a tubular body, the front and rear ends of the tubular body being connected to a boom clip and a seat cover, respectively; an end of the wall plate is provided with a beveled edge, an end of the cover plate is provided with an arcuate edge, and a concave point is provided at the intersection of the beveled edge and the arcuate edge;

[0007] The upper arm hairpin includes a top plate, a bottom plate and side plates, which constitute the upper arm hairpin body. A first reinforcing rod and a second reinforcing rod are arranged inside the upper arm hairpin body. The middle parts of the first reinforcing rod and the second reinforcing rod are connected by welding to form an X-shaped structure.

[0008] According to one embodiment of the present invention, the upper end of the first reinforcing rod is connected to the junction of the top plate and the side plate by welding, and the lower end of the first reinforcing rod is connected to the junction of the bottom plate and the other side plate by welding.

[0009] According to one embodiment of the present invention, the upper end of the second reinforcing rod is connected to the junction of the top plate and the side plate by welding, and the lower end of the second reinforcing rod is connected to the junction of the bottom plate and the other side plate by welding.

[0010] According to an embodiment of the present invention, one end of the top plate and the bottom plate are both provided with an arc-shaped edge adapted to the arc edge, and the arc edge and the arc edge are connected by welding.

[0011] According to an embodiment of the present invention, one end of the side panel is provided with a beveled edge adapted to the beveled side, and the beveled side and the beveled edge are connected by welding.

[0012] According to an embodiment of the present invention, a convex point is formed at the junction of the oblique edge and the arc-shaped edge, and the convex point is located inside the concave point and is connected to the concave point by welding.

[0013] According to one embodiment of the present invention, two coaxial pin sleeves are provided at the ends of the upper arm hairpin and the seat sleeve, a lubricating sleeve is connected to the outer side of the pin sleeve on one side, a lubricating cavity is provided inside the lubricating sleeve, an oil filling hole is provided on the lubricating sleeve, and the oil filling hole is connected to the lubricating cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the large arm hairpin of the utility model Figure 1 ;

[0016] Figure 3 This is a schematic diagram of the structure of the large arm hairpin of the utility model Figure 2 ;

[0017] In the accompanying drawings: 1. cover plate, 2. wall panel, 3. upper arm hairpin, 4. seat cover, 5. bevel edge, 6. arc edge, 7. convex point, 8. top plate, 9. bottom plate, 10. first reinforcing rod, 11. second reinforcing rod, 12. pin sleeve, 13. lubrication sleeve, 14. oil filling hole, 15. side panel. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will be combined with the appendix of the present invention. Figure 1 ~Attachment Figure 3 , the utility model is described in more detail.

[0019] The following description is intended to disclose the present invention and enable those skilled in the art to implement the present invention. The preferred embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0020] Those skilled in the art should understand that, in the disclosure of the specification, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0021] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0022] The utility model provided by the present invention provides an excavator boom, including a cover plate 1 and a wall plate 2, the cover plate 1 and the wall plate 2 form a tube body, the front and rear ends of the tube body are respectively connected with a large arm hairpin 3 and a seat cover 4; the end of the wall plate 2 is provided with a bevel 5, the end of the cover plate 1 is provided with an arc edge 6, and the intersection of the bevel and the arc edge 6 is provided with a concave point; the large arm hairpin 3 includes a top plate 8, a bottom plate 9 and a side plate 15, the top plate 8, the bottom plate 9 and the side plate 15 form the main body of the large arm hairpin 3, and the inside of the main body of the large arm hairpin 3 is provided with a first reinforcing rod 10 and a second reinforcing rod 11, the middle parts of the first reinforcing rod 10 and the second reinforcing rod 11 are connected by welding to form an X-shaped structure; the upper end of the first reinforcing rod 10 is connected to the intersection of the top plate 8 and the side plate 15 by welding, and the lower end of the first reinforcing rod 10 is connected to the intersection of the bottom plate 9 and the other side class by welding ; The upper end of the second reinforcing rod 11 is connected to the junction of the top plate 8 and the side plate 15 by welding, and the lower end of the second reinforcing rod 11 is connected to the junction of the bottom plate 9 and the other side class by welding; one end of the top plate 8 and the bottom plate 9 is provided with an arc edge adapted to the arc edge 6, and the arc edge 6 is connected to the arc edge by welding; one end of the side plate 15 is provided with a beveled edge adapted to the hypotenuse 5, and the beveled edge 5 is connected to the beveled edge by welding; a convex point 7 is formed at the junction of the bevel edge and the arc edge, and the convex point 7 is located inside the concave point and is connected to the concave point by welding; the ends of the upper arm hairpin 3 and the seat cover 4 are provided with two coaxial pin sleeves 12, and the outer side of the pin sleeve 12 on one side is connected to a lubricating sleeve 13, a lubricating cavity is provided inside the lubricating sleeve 13, and an oil filling hole 14 is provided on the lubricating sleeve 13, which is connected to the lubricating cavity.

[0023] The first embodiment of the present utility model is as follows:

[0024] An excavator boom includes a cover plate 1 and a wall plate 2. The cover plate 1 and the wall plate 2 form a tube body. A plurality of reinforcing plates are provided inside the tube body. The two sides of the reinforcing plates are welded to the wall plate 2, and the upper and lower ends of the reinforcing plates are welded to the cover plate 1, thereby strengthening the structural strength of the tube body.

[0025] The front and rear ends of the tube body are respectively connected to the arm hairpin 3 and the seat cover 4, which are connected to the frame through the seat cover 4 and to the arm through the arm hairpin 3; the end of the wall panel 2 is provided with a bevel 5, the end of the cover plate 1 is provided with an arc edge 6, and a concave point is provided at the junction of the bevel and the arc edge 6; the arm hairpin 3 includes a top plate 8, a bottom plate 9 and a side plate 15, which constitute the main body of the arm hairpin 3. One end of the top plate 8 and the bottom plate 9 is provided with an arc edge that matches the arc edge 6, and the arc edge 6 is connected to the arc edge by welding. One end of the side panel 15 is provided with a beveled edge adapted to the beveled edge 5, the beveled edge 5 is connected to the beveled edge by welding, and a convex point 7 is formed at the junction of the beveled edge and the arc edge. The convex point 7 is located inside the concave point and is connected to the concave point by welding, and a special-shaped welding structure is formed by the arc edge 6 and the beveled edge 5. Compared with the conventional straight edge welding, the structural strength is greater. When subjected to torsion, the arcs at the upper and lower ends can disperse the stress to the outside of the arc edge 6, thereby reducing the probability of cracking at the welding of the upper arm hairpin 3.

[0026] A first reinforcing rod 10 and a second reinforcing rod 11 are provided inside the main body of the upper arm hairpin 3. The middle parts of the first reinforcing rod 10 and the second reinforcing rod 11 are connected by welding to form an X-shaped structure. The upper end of the first reinforcing rod 10 is connected to the junction of the top plate 8 and the side plate 15 by welding, and the lower end of the first reinforcing rod 10 is connected to the junction of the bottom plate 9 and the other side class by welding. The upper end of the second reinforcing rod 11 is connected to the junction of the top plate 8 and the side plate 15 by welding, and the lower end of the second reinforcing rod 11 is connected to the junction of the bottom plate 9 and the other side class by welding.

[0027] Through the X-shaped first reinforcing rod 10 and second reinforcing rod 11 structure, when the front end of the upper arm hairpin 3 is subjected to torsion, stress can be transmitted through the first reinforcing rod 10 and the second reinforcing rod 11. On the one hand, it prevents all the stress from acting on the pin shaft, avoiding stress conflict between the pin shaft and the pin sleeve 12. On the other hand, it can enhance the strength of the structure. On the basis of improving lightweight, the structural strength is improved to prevent deformation or even cracking of both sides of the upper arm hairpin 3 due to torsion.

[0028] Two coaxial pin sleeves 12 are provided at the ends of the upper arm hairpin 3 and the seat sleeve 4. A lubricating sleeve 13 is connected to the outer side of the pin sleeve 12 on one side. A lubricating cavity is provided inside the lubricating sleeve 13. An oil filling hole 14 is provided on the lubricating sleeve 13. The oil filling hole 14 is connected to the lubricating cavity. During installation, the pin shaft passes through the two pin sleeves 12 to connect the boom and the bucket arm. At the same time, the lubricating oil inside the lubricating cavity can enter the gap between the pin sleeve 12 and the pin shaft to play a lubricating role.

[0029] In other embodiments, lubricating sleeves 13 are provided on the pin shafts on both sides, so as to lubricate both pin sleeves 12 .

[0030] It should be noted that the terms "first, second and third" in the present invention are only used for descriptive purposes and do not indicate any order. They cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.

[0031] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles herein.

Claims

1. An excavator boom, characterized in that: The tubular body comprises a cover plate and a wall plate, wherein the cover plate and the wall plate form a tubular body, wherein the front and rear ends of the tubular body are respectively connected to a large arm clip and a seat cover; the end of the wall plate is provided with a beveled edge, and the end of the cover plate is provided with an arc edge, and a concave point is provided at the intersection of the beveled edge and the arc edge; The upper arm hairpin includes a top plate, a bottom plate and side plates, which constitute the upper arm hairpin body. A first reinforcing rod and a second reinforcing rod are arranged inside the upper arm hairpin body. The middle parts of the first reinforcing rod and the second reinforcing rod are connected by welding to form an X-shaped structure.

2. The excavator boom according to claim 1, wherein: The upper end of the first reinforcing rod is connected to the junction of the top plate and the side plate by welding, and the lower end of the first reinforcing rod is connected to the junction of the bottom plate and the other side plate by welding.

3. The excavator boom according to claim 1, wherein: The upper end of the second reinforcing rod is connected to the junction of the top plate and the side plate by welding, and the lower end of the second reinforcing rod is connected to the junction of the bottom plate and the other side plate by welding.

4. The excavator boom according to claim 1, wherein: One end of the top plate and the bottom plate is provided with an arc edge adapted to the arc edge, and the arc edge is connected to the arc edge by welding.

5. The excavator boom according to claim 4, characterized in that: One end of the side plate is provided with an oblique edge adapted to the oblique side, and the oblique side and the oblique edge are connected by welding.

6. The excavator boom according to claim 5, characterized in that: A convex point is formed at the junction of the oblique edge and the arc-shaped edge. The convex point is located inside the concave point and is connected to the concave point by welding.

7. The excavator boom according to claim 1, wherein: The ends of the upper arm hairpin and the seat cover are each provided with two coaxial pin sleeves, the outer side of the pin sleeve on one side is connected to a lubrication sleeve, a lubrication cavity is provided inside the lubrication sleeve, an oil filling hole is provided on the lubrication sleeve, and the oil filling hole is connected to the lubrication cavity.

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