CN219033346U

CN219033346U - Swing arm structure

Info

Publication number: CN219033346U
Application number: CN202223589961.XU
Authority: CN
Inventors: 钟宝慧; 郭涛; 黄松; 王伟
Original assignee: Xiamen Xiagong Zhonglixing Intelligent Technology Co ltd
Current assignee: Xiamen Xiagong Zhonglixing Intelligent Technology Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-16
Anticipated expiration: 2032-12-29

Abstract

The movable arm structure comprises a movable arm frame and two side plates, wherein the two ends of the movable arm frame are respectively provided with a first hinge part and a second hinge part, the first hinge part is used for being hinged on a main frame of the excavator, the second hinge part is used for being hinged on a bucket rod, the side plates are arranged on the side parts of the movable arm frame, and the side plates comprise a first plate and a second plate from front to back; the front end of the first plate is provided with a bending part integrally connected with the top surface and the bottom surface of the first plate, the outer diameter D1 of the bending part is larger than the outer diameter D2 of the first hinge part, and the rear end of the first plate forms a notch; a first welding line is formed between the top surface of the first plate and the side end of the top wall of the movable arm frame, a second welding line is formed between the inner side surface of the bending part and the outer wall of the first hinging part, a third welding line is formed between the bottom surface of the first plate and the side end of the bottom wall of the movable arm frame, and a fourth welding line is formed between the side wall of the notch and the outer surface of the second plate; the movable arm structure effectively avoids fatigue cracking of the movable arm caused by stress concentration due to weld defects by increasing the length of the welding bead.

Description

Swing arm structure

Technical Field

The utility model relates to engineering machinery, in particular to a movable arm structure.

Background

The excavator is one kind of engineering machinery, and is widely used in building, road, mine and other engineering fields and has the main function of excavating work. The working part of the excavator mainly comprises a movable arm, a bucket rod and a bucket, all parts swing around a hinge point under the action of a hydraulic cylinder to finish the actions of excavating, lifting, unloading soil and the like, wherein one end part of the movable arm is hinged to a main frame of the excavator, and the other end part of the movable arm is hinged to the bucket rod, so that the movable arm is a total support of the whole working part, and the stress intensity of the movable arm is very high, such as the end part (a hinge part) of the movable arm.

Fig. 1 and 2 are schematic views of a prior art boom structure, in which a boom includes a boom frame 1' and two side plates 2' disposed at the sides of the boom frame 1', the front end of the boom frame 1' is hinged to a main frame of an excavator, the rear end of the boom frame is hinged to a boom, each side plate 2' includes a first plate 21', a second plate 22' and a reinforcing plate 23' from front to rear, the front end of the first plate 21' is provided with a groove 211' engaged with a hinge portion 11' at the front end of the boom frame 1', a first welding line L1' is formed between the groove 211' of the first plate 21' and an outer side wall of the hinge portion 11', a second welding line L2' is formed between opposite end surfaces of the first plate 21' and the second plate 22', and the reinforcing plate 23' is welded to an inner surface of the second plate 22' and is used to make abutting contact with the first plate 21', thereby improving the structural strength of the side plate 2 '. However, the welding bead of the movable arm structure is short, and the problems of false welding, false welding and the like are easy to occur, so that the fatigue cracking of the side plate is caused by stress concentration due to the defect of the welding bead, and the operation reliability of the movable arm is affected.

In view of the above, the present inventors have made intensive studies to solve the above-mentioned drawbacks of the prior art.

Disclosure of Invention

A first object of the present utility model is to provide a boom structure in which the structural strength of the boom is improved by increasing the length of the weld bead.

The second object of the present utility model is to provide a movable arm structure, which facilitates lubrication of a pin shaft by adding an oil filling hole on a first plate.

In order to achieve the first object, a boom structure includes a boom frame and two side plates, wherein a front end portion and a rear end portion of the boom frame form a first hinge portion and a second hinge portion, respectively, the first hinge portion is used for being hinged on a main frame of an excavator through a pin shaft, the second hinge portion is used for being hinged on an arm through a pin shaft, the side plates are configured on side portions of the boom frame, and the side plates include a first plate and a second plate from front to back; the front end of the first plate is provided with a bending part integrally connected with the top surface and the bottom surface of the first plate, the outer diameter D1 of the bending part is larger than the outer diameter D2 of the first hinge part, and the rear end of the first plate forms a notch; a first welding line is formed between the top surface of the first plate and the side end of the top wall of the movable arm frame, a second welding line is formed between the inner side surface of the bending part and the outer wall of the first hinging part, a third welding line is formed between the bottom surface of the first plate and the side end of the bottom wall of the movable arm frame, and a fourth welding line is formed between the side wall of the notch and the outer surface of the second plate.

With the adoption of the design, compared with the movable arm structure in the prior art, the length of a welding bead is increased, fatigue cracking of the movable arm structure caused by stress concentration due to weld defects can be effectively avoided, and the service life of the movable arm is prolonged.

In order to achieve the second object, the first plate is provided with an oil filling port, the first hinge part of the movable arm frame is provided with a through hole, the through hole is communicated with the inner cavity of the first hinge part, and the oil filling port and the through hole are respectively communicated through an oil guide pipe. So set up, the lubricating oil of being convenient for gets into from the oiling mouth, gets into to in the inner chamber of first articulated portion from the through-hole through leading oil pipe for lubricate the round pin axle.

Drawings

The detailed description given as non-limiting examples better explain what the utility model comprises and can be implemented with reference to the accompanying drawings, in which:

FIGS. 1 and 2 are schematic views of a prior art boom structure;

FIG. 3 is a perspective view of the boom structure of the present utility model;

fig. 4 is an enlarged view of a portion a of fig. 3;

FIG. 5 is an exploded view of the boom structure of the present utility model;

FIG. 6 is a front view of the boom structure of the present utility model;

fig. 7 is a B-B cross-sectional view of fig. 6.

Detailed Description

The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

In the description of the present utility model, it is to be understood that the terms "top", "bottom", "inner", "outer", etc. indicate orientations or

The positional relationship is based on the orientation or positional relationship shown in the drawings, for convenience of description and simplicity of description only, and 5 does not indicate or imply that the apparatus or elements in question must have a particular orientation, be constructed and operated in a particular orientation, and thus not

Is to be understood as a limitation of the present utility model; the terms "front" and "rear" correspond to the distance between each member and the main frame of the excavator, the "front" is the side close to the main frame of the excavator, the "rear" is the side far away from the main frame of the excavator, and for convenience of understanding, the azimuth directions of the terms "front" and "rear" are consistent with the directions of the reference numerals of the specification.

In the claims and specification, unless otherwise defined, the terms "first," "second," and the like are used to distinguish between objects of different 0's and are not used to describe a particular order.

Referring to fig. 3 to 6, a boom structure includes a boom frame 1 and two side plates 2, a front end portion and a rear end portion of the boom frame 1 are respectively formed with a first hinge portion 11 and a second hinge portion 12, the first hinge portion 11 is used for being hinged on an excavator main frame through a pin 3, and the second hinge portion 12 is used for being hinged on an arm through the pin 3.

Referring to fig. 3 and 5, the side plate 2 is disposed at a side portion of the boom frame 1, the side plate 2 includes a first plate 21 and a second plate 22 from front to back, the first plate 21 protrudes out of the boom frame 1, and the second plate 22 is disposed inside the boom frame 1. The front end of the first plate 21 is provided with a bending part 213 integrally connected with the top surface 211 and the bottom surface 212 thereof, the bending part 213 protrudes from the top surface 211 and the bottom surface 212 of the first plate 21, and the outer diameter D1 of the bending part 213 is larger than the outer diameter D2 of the first hinge part 11. The rear end of the first plate 21 forms a notch 214, the notch 214 is V-shaped, and the tip end thereof is a circular arc transition portion 2142.

Referring to fig. 4 and 6, a first welding line L1 is formed between the top surface 211 of the first plate 21 and the top wall side end 13 of the boom frame 1, a second welding line L2 is formed between the inner side surface of the bending portion 213 and the outer wall of the first hinge portion 11, a third welding line L3 is formed between the bottom surface 212 of the first plate 21 and the bottom wall side end 14 of the boom frame 1, a fourth welding line L4 is formed between the side wall 2141 of the notch 214 and the outer surface of the second plate 22, a fifth welding line L5 is formed at the adjacent position of the bending portion 213 and the top surface 211 of the boom frame 1, a sixth welding line L6 is formed at the adjacent position of the bending portion 213 and the bottom surface 212 of the boom frame 1, the fifth welding line L5 is continuously arranged with the first welding line L1 and the second welding line L2, and the sixth welding line L6 is continuously arranged with the second welding line L2 and the third welding line L3.

The rear end of the first plate 21 is provided with two symmetrical yielding inclined planes 215 with gradually reduced heights from front to back, and the yielding inclined planes 215 are arranged so as to facilitate welding by manpower or machines. Preferably, referring to fig. 4, the lower end 2151 of the yielding inclined plane 215 is substantially flush with the top wall side end 13 and the bottom wall side end 14 of the boom frame 1, and the height of the fourth welding seam L4 is consistent with that of the lower end 2151 of the yielding inclined plane 215, so that the fourth welding seam L4 can smoothly transition with the first welding seam L1 and the third welding seam L3, and the continuity of the fourth welding seam L4 with the first welding seam L1 and the third welding seam L3 is ensured.

Preferably, the front end of the first plate 21 is provided with a sleeve block 216 for the pin shaft 3 to pass through, and the arrangement of the sleeve block 216 increases the width of the movable arm frame 1 in the area, increases the supporting surface of the pin shaft 3 on the movable arm frame 1 (located in the area of the sleeve block 216), and reduces the shearing stress between the pin shaft 3 and the two first plates 21.

With the adoption of the design, compared with the movable arm structure in the prior art, the length of the welding bead is increased, meanwhile, referring to fig. 4, the continuity of any two adjacent welding seams can effectively avoid fatigue cracking of the movable arm structure caused by stress concentration due to the defect of the welding seams, and the service life of the movable arm is prolonged.

Referring to fig. 7, the present utility model further discloses a movable arm structure for facilitating lubrication of the pin shaft 3, wherein the first plate 21 is provided with an oil filling port, the first hinge portion 11 of the movable arm frame 1 is provided with a through hole 111, the through hole 111 is communicated with the inner cavity of the first hinge portion 11, and the oil filling port 217 and the through hole 111 are respectively communicated through an oil guide pipe 4, so that lubrication oil is conveniently introduced from the oil filling port, and is introduced into the inner cavity of the first hinge portion 11 from the through hole 111 through the oil guide pipe 4, so as to lubricate the pin shaft 3.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims

1. A movable arm structure, the movable arm comprises a movable arm frame (1) and two side plates (2), a first hinging part (11) and a second hinging part (12) are respectively formed at the front end part and the rear end part of the movable arm frame (1), the first hinging part (11) is used for hinging on an excavator main frame through a pin shaft (3), the second hinging part (12) is used for hinging on a bucket rod through the pin shaft (3), the side plates (2) are configured at the side parts of the movable arm frame (1), and the side plates (2) comprise a first plate (21) and a second plate (22) from front to back; the front end of the first plate (21) is provided with a bending part (213) integrally connected with the top surface (211) and the bottom surface (212), the outer diameter D1 of the bending part (213) is larger than the outer diameter D2 of the first hinge part (11), and the rear end of the first plate (21) is provided with a notch (214); a first welding line (L1) is formed between the top surface (211) of the first plate (21) and the top wall side end (13) of the movable arm frame (1), a second welding line (L2) is formed between the inner side surface of the bending part (213) and the outer wall of the first hinge part (11), a third welding line (L3) is formed between the bottom surface (212) of the first plate (21) and the bottom wall side end (14) of the movable arm frame (1), and a fourth welding line (L4) is formed between the side wall (2141) of the notch (214) and the outer surface of the second plate (22).

2. A boom structure as claimed in claim 1, wherein: the bending part (213) protrudes out of the top surface (211) and the bottom surface (212) of the first plate (21), a fifth welding line (L5) is formed at the abutting position of the bending part (213) and the top surface (211), and a sixth welding line (L6) is formed at the abutting position of the bending part (213) and the bottom surface (212).

3. A boom structure as claimed in claim 2, wherein: the fifth welding seam (L5) is continuously arranged with the first welding seam (L1) and the second welding seam (L2), and the sixth welding seam (L6) is continuously arranged with the second welding seam (L2) and the third welding seam (L3).

4. A boom structure as claimed in claim 1, wherein: the rear end part of the first plate (21) is provided with two symmetrical yielding inclined planes (215) with gradually reduced heights from front to back, the low end (2151) of the yielding inclined planes (215) is flush with the top wall side end (13) and the bottom wall side end (14) of the movable arm frame (1), and the fourth welding seam (L4) is consistent with the low end (2151) of the yielding inclined planes (215).

5. A boom structure as claimed in claim 1, wherein: the front end of the first plate (21) is provided with a sleeve block (216) for the pin shaft (3) to pass through.

6. A boom structure as claimed in claim 1, wherein: the notch (214) is V-shaped, and the tip end of the notch is an arc transition part (2142).

7. The boom structure of any of claims 1-6, wherein: the movable arm frame is characterized in that an oil filling port (217) is formed in the first plate (21), a through hole (111) is formed in the first hinge part (11) of the movable arm frame (1), the through hole (111) is communicated with the inner cavity of the first hinge part (11), and the oil filling port (217) and the through hole (111) are respectively communicated through an oil guide pipe (4).