US-12624524-B2 - Bending boom, boom device, and work machine

Abstract

Disclosed are a bending boom, a boom device and a work machine. The bending boom includes a middle portion and two extending portions. The middle portion is configured to connect external components. The extending portion has a first side wall and a second side wall opposite to the first side wall. The first side wall is flush with middle portion, and the second side wall is bent from middle portion towards a direction near first side wall. The two extending portions are connected to two opposite ends of middle portion. By providing the matching middle portion and extending portions, a situation in which stress concentration occurs at the middle portion can be prevented, which improves stress condition of the bending boom, and improves durability of the bending boom, the boom device and the work machine.

Inventors

• Biao Deng
• Jiangbo Li

Assignees

• SANY AUTOMOBILE MANUFACTURING CO., LTD.

Dates

Publication Date

20260512

Application Date

20230922

Priority Date

20210428

Claims (6)

1. 1 . A bending boom, comprising: a middle portion configured to connect an external component; and two extending portions, each of the two extending portions having a first side wall and a second side wall opposite to the first side wall, wherein the first side wall is flush with the middle portion, and the second side wall is at least partially bent from the middle portion towards a direction near the first side wall; wherein the two extending portions are connected to two opposite ends of the middle portion, the first side walls of the two extending portions are connected to two different side walls of the middle portion, and the second side walls of the two extending portions are connected to two different side walls of the middle portion; the second side wall comprises a bending section, one end of the bending section is connected to the middle portion, and the bending section is bent from the middle portion towards a direction near the first side wall; and the bending section is arc-shaped, and a curvature in a middle of the bending section is greater than a curvature on two end portions of the bending section.
2. 2 . The bending boom according to claim 1 , wherein the first side wall and the second side wall of the same extending portion are provided on two opposite sides of the bending boom in a horizontal plane.
3. 3 . The bending boom according to claim 2 , wherein a longitudinal section area of the extending portion gradually decreases from the middle portion towards a direction away from the middle portion.
4. 4 . The bending boom according to claim 1 , wherein the second side wall further comprises a connecting section, the connecting section is connected to one end of the bending section away from the middle portion, and the connecting section is parallel to the first side wall.
5. 5 . The bending boom according to claim 1 , wherein the bending boom further comprises an oil cylinder base, and the oil cylinder base is connected to the middle portion and configured to connect an external oil cylinder.
6. 6 . A boom device, comprising: a front boom; a rear boom; and the bending boom according to claim 1 , wherein the front boom and the rear boom are articulated to two ends of the bending boom.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation application of International Application No. PCT/CN2021/103254, filed on Jun. 29, 2021, which claims priority to Chinese Patent Application No. 202120904704.7, filed on Apr. 28, 2021. The above-mentioned applications are incorporated herein by reference in their entireties. TECHNICAL FIELD The present application relates to the technical field of technical equipment for work machine, in particular to a bending boom, a boom device, and a work machine. BACKGROUND A boom is a commonly used device in a work machine that transports materials to a certain location. A boom assembly is typically of a multi-section structure and has a folding function, which facilitates transporting and working. A bending portion of a conventional boom is generally located in front of an oil cylinder base. As shown in FIG. 1, the boom 10′ has a connecting portion 101 and a bending portion 102 which are connected, and the connecting portion 101 is connected to the oil cylinder base. Since a distance between two ends of the boom 10′ is small, stress concentration is prone to occur at the bending portion 102 of the boom 10′, which brings a poor stress condition and affects the durability of the boom 10′. Therefore, there is a need to improve the above technical solution to change the current situation. SUMMARY The present application aims to solve at least one of the problems existing in the existing art or the related art. For this, the purpose of the present application is to provide a bending boom, a boom device and a work machine to solve the problem that stress concentration is prone to occur at a bending portion of a boom in a conventional work machine, and thereby affecting the durability. To achieve the above purpose, the technical solution according to a first aspect of the present application provides a bending boom, which includes a middle portion and two extending portions: the middle portion is configured to connect an external component: each extending portion has a first side wall and a second side wall opposite to the first side wall: the first side wall is flush with the middle portion, and the second side wall is at least partially bent from the middle portion towards a direction near the first side wall: the two extending portions are connected to two opposite ends of the middle portion, the first side walls of the two extending portions are connected to two different side walls of the middle portion, and the second side walls of the two extending portions are connected to two different side walls of the middle portion. According to a bending boom provided by the present application, the first side wall and the second side wall of the same extending portion have separated projections on a horizontal plane. According to a bending boom provided by the present application, a longitudinal section area of the extending portion gradually decreases from the middle portion towards a direction away from the middle portion. According to a bending boom provided by the present application, the second side wall includes a bending section, one end of the bending section is connected to the middle portion, and the bending section is bent from the middle portion towards a direction near the first side wall. According to a bending boom provided by the present application, the bending section is arc-shaped, and a curvature in a middle of the bending section is greater than the curvature on two sides. According to a bending boom provided by the present application, the second side wall further includes a connecting section, the connecting section is connected to one end of the bending section away from the middle portion, and the connecting section is parallel to the first side wall. According to a bending boom provided by the present application, the bending boom further includes an oil cylinder base, the oil cylinder base is connected to the middle portion and configured to connect an external oil cylinder. The technical solution according to a second aspect of the present application provides a boom device, which includes a front boom, a rear boom, and any one of the bending booms described above: the front boom and the rear boom are articulated to two ends of the bending boom. According to a boom device provided by the present application, the boom device further includes a first sectional boom: one end of the first sectional boom is configured to be articulated to a rotating platform of a vehicle body, and the other end of the first sectional boom is articulated to the front boom; the front boom is a second sectional boom, the bending boom is a third sectional boom, and the rear boom is a fourth sectional boom: the first sectional boom, the second sectional boom and a head section of the third sectional boom occupy one column of space; and the fourth sectional boom and an end section of the third sectional boom occupy another column of space. The technical