An arm structure and an engineering machine
By differentiating the thickness of the upper and lower main chords of the boom structure and utilizing the lifting section to achieve boom section flipping, the problems of large boom weight and angle adaptability were solved, achieving lightweighting and multi-angle adaptability, and improving the performance of the crane.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 엑스씨엠지 컨스트럭션 머쉬너리 코퍼레이션 리미티드 엘티디 빌딩 머쉬너리 코퍼레이션
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-14
AI Technical Summary
In existing technologies, the upper and lower main chords of the boom structure have uniform thickness, resulting in high weight and cost, and making it unable to meet the diverse boom working angle requirements.
The design incorporates different wall thicknesses for the upper and lower main chords, and the boom section can be rotated via a hoisting unit to meet the needs of different working angles.
It reduces the weight and cost of the boom structure, increases lifting capacity, expands the boom's working angle, and enhances the product's market competitiveness.
Smart Images
Figure CN224493561U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of crane hoisting technology, and in particular relates to a boom structure and engineering machinery. Background Technology
[0002] With the rapid development of my country's economy and science and technology, wind power, petrochemical and other fields have placed higher demands on the performance of crawler cranes, leading to a continuous increase in demand for crawler cranes with long booms and large lifting capacities. Normally, during lifting operations, the upper main chord of the boom structure experiences less stress than the lower main chord. However, cranes operate under various conditions, and the boom's working angles vary. Different boom working angles result in differences in the stress on the upper and lower main chords. In existing technologies, the thickness and weight of the upper and lower main chords are designed based on the load-bearing capacity of the lower main chord. Therefore, the load-bearing capacity of the upper main chord in existing technologies has a certain margin. With the demand for long booms, this structure presents problems such as a large overall boom weight, a large required counterweight tonnage, indirectly increasing the weight of other components, and higher overall machine cost. Furthermore, it cannot adapt to the needs of more boom working angles. Utility Model Content
[0003] The technical problem to be solved by this utility model is: how to reduce the weight of the boom structure while ensuring its lifting capacity and adapting to the needs of more boom working angles.
[0004] To achieve the above objectives, the technical solution of this utility model is as follows:
[0005] In a first aspect, this utility model provides a boom structure, comprising:
[0006] The bottom section arm, the first end of which is connected to the machine body;
[0007] Intermediate arm, the first end of which is connected to the second end of the base arm;
[0008] Arm head, the first end of which is connected to the second end of the intermediate arm;
[0009] The intermediate arm includes an upper main chord, a lower main chord, a horizontal web member, and a diagonal web member. Adjacent upper main chords and / or lower main chords are connected by horizontal web members and diagonal web members. The wall thickness of the upper main chord is different from that of the lower main chord.
[0010] Both the upper and lower main chords are equipped with lifting sections that cooperate with the auxiliary crane to tilt the intermediate arm. The lifting sections of the upper and lower main chords are arranged opposite each other.
[0011] The head arm, intermediate arm, and bottom arm are connected by pins.
[0012] The outer diameter of the upper main chord of the intermediate arm is the same as that of the lower main chord.
[0013] The intermediate arm includes several intermediate segments.
[0014] The outer diameters of the upper and lower main chords of adjacent intermediate arms are the same, but the wall thicknesses of the upper and lower main chords of adjacent intermediate arms are different.
[0015] The intermediate arm is a truss structure.
[0016] Secondly, this utility model provides an engineering machinery, including the boom structure in the above embodiments.
[0017] The construction machinery is a crawler crane.
[0018] This utility model adopts a differentiated design of the wall thickness of the upper and lower main chords of the boom structure. While ensuring lifting capacity, it effectively reduces the weight of the entire boom structure, lowers the manufacturing cost of the boom structure, increases lifting capacity, and fully considers the boom deflection and deformation problem in actual working engineering. Through the boom section flipping design, the working angle of the boom structure is further extended, which can play a better role in the specific use scenario, thereby improving the market competitiveness of the product. Attached Figure Description
[0019] Figure 1 This is a structural diagram of the boom of this utility model;
[0020] Figure 2 This is a structural diagram of the intermediate arm of this utility model;
[0021] Figure 3 This is a schematic diagram of the boom of this utility model in a small-angle working state;
[0022] Figure 4 This is a schematic diagram of the boom of this utility model in a large-angle working state;
[0023] In the diagram: 1-bottom boom; 2-intermediate boom; 3-boom head; 4-pull plate; 5-boom frame; 6-deformable boom frame; 21-upper main chord; 22-lower main chord; 23-lifting section; 24-horizontal web member; 25-diagonal web member. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be described in more detail below with reference to the accompanying drawings.
[0025] Example 1
[0026] refer to Figure 1 and Figure 2 As shown, a boom structure includes: a base boom 1, the first end of which is connected to the machine body; an intermediate boom 2, the first end of which is connected to the second end of the base boom 1; and a boom head 3, the first end of which is connected to the second end of the intermediate boom 2. The boom head 3, the intermediate boom 2, and the base boom 1 are all truss structures, and the boom head 3, the intermediate boom 2, and the base boom 1 are connected by pins.
[0027] In this embodiment, the intermediate arm 2 includes an upper main chord 21, a lower main chord 22, a diagonal web member 25, and a transverse web member 24. The cross-section of the intermediate arm 2 can be rectangular or trapezoidal. The upper main chords 21 on both sides are arranged in parallel, and the lower main chords 22 on both sides are arranged in parallel. Adjacent upper main chords 21 and lower main chords 22 can be parallel or coplanar and non-parallel (their extensions intersect at a point outside the intermediate arm). Adjacent upper main chords 21 and / or lower main chords 22 are connected by the diagonal web member 25 and the transverse web member 24. The connection between the horizontal web member 24 and the upper main chord member 21 or the lower main chord member 22 is located at the opposite ends of the upper main chord member 21 and the lower main chord member 22. Several diagonal web members 25 are connected end to end between adjacent main chord members. One end of the diagonal web member 25 is connected to the upper main chord member 21 or the lower main chord member 22, and the other end is connected to the adjacent upper main chord member 21 or the lower main chord member 22. The diagonal web members 25 and the main chord members form a triangular structure to enhance the structural strength of the intermediate arm 2. The diagonal web members 25 and the horizontal web member 24 are connected to the upper main chord member 21 and the lower main chord member 22 by welding.
[0028] In this embodiment, the upper main chord 21 and the lower main chord 22 of the intermediate arm 2 have the same outer diameter, but the wall thicknesses of the upper main chord 21 and the lower main chord 22 are different.
[0029] For more specific details, please refer to Figure 3 and Figure 4 As shown, the crane operates under various conditions, and the boom's working angle varies. Different working angles cause different boom deformations, resulting in different stress conditions for the upper main chord 21 and the lower main chord 22. When the boom 5 is in a large-angle working state, it will experience a certain degree of deflection deformation due to the force of the tension plate 4. At this time, the lower main chord 22 experiences a greater force than the upper main chord 21. To meet the crane's load-bearing requirements, the wall thickness of the lower main chord 22 is greater than that of the upper main chord 21. However, when the boom 5 is in a small-angle working state, it will experience a certain degree of deflection deformation due to its own weight. At this time, the lower main chord 22 of the intermediate boom 2 experiences a less force than the upper main chord 21. To meet the crane's load-bearing requirements, the wall thickness of the lower main chord 22 is less than that of the upper main chord 21.
[0030] To extend the boom's working angle and further improve the performance of cranes and other equipment, without replacing the intermediate boom 2, both the upper main chord 21 and the lower main chord 22 are equipped with lifting sections 23 that cooperate with an auxiliary crane to flip the intermediate boom 2. The lifting sections of the upper main chord 21 and the lower main chord 22 are arranged opposite each other. With the cooperation of the auxiliary crane, the boom is flipped, so that the original upper main chord becomes the lower main chord and the original lower main chord becomes the upper main chord, in order to meet different boom working angle requirements.
[0031] In one possible implementation, the hoisting part 23 is a hoisting ring structure, with two hoisting rings provided on each upper main chord 21 and lower main chord 22. The hoisting rings are detachably connected to the slings. The position of the main chord of the intermediate arm 2 can be rotated 180 degrees by an auxiliary crane. The hoisting rings can also be used for hoisting and disassembling the intermediate arm.
[0032] By differentiating the thickness of the upper and lower main chords, not only can the load-bearing capacity of both the upper and lower main chords be guaranteed, but the overall weight of the boom structure can also be reduced, the torque from the intermediate arm to the center of rotation can be reduced, and the lifting capacity of the boom structure can be improved.
[0033] In one possible embodiment, the intermediate arm 2 includes several intermediate sections. The wall thickness of the upper main chord 21 and the wall thickness of the lower main chord 22 of adjacent intermediate sections are different. The intermediate sections are connected by pins to facilitate installation and disassembly.
[0034] The outer diameter of the upper main chord 21 is the same as that of the lower main chord 22. The outer diameter of the upper main chord 21 of adjacent intermediate boom sections is the same as that of the lower main chord 22. This design can make the boom structure aesthetically pleasing while facilitating the connection between boom sections.
[0035] The specific wall thickness values of the upper and lower main chords are determined based on the crane's load-bearing capacity. For cranes of different tonnages, differentiated designs are required to achieve the best results. There is no fixed relationship between the wall thicknesses (t1, t2...ti, tn) of the upper and lower main chords of each intermediate boom section; different boom section combinations form a boom that meets performance requirements.
[0036] Example 2
[0037] This utility model also provides an engineering machinery, which includes the boom structure described in the above embodiments. The engineering machinery may be a crawler crane, and other parts of the crawler crane can be referred to in the prior art, and will not be described further herein.
[0038] In summary, this utility model adopts a differentiated design of the wall thickness of the upper and lower main chords of the boom structure. While ensuring lifting capacity, it effectively reduces the weight of the entire boom structure, lowers the manufacturing cost of the boom structure, increases lifting capacity, and fully considers the boom deflection and deformation problem in actual working engineering. Through the boom section flipping design, the working angle of the boom structure is further improved, which can better leverage boom performance according to specific usage scenarios, thereby improving the product's market competitiveness.
[0039] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between components in a specific orientation. If the specific orientation changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this application and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.
Claims
1. A boom structure, characterized in that, include: The bottom section arm, the first end of which is connected to the machine body; Intermediate arm, the first end of which is connected to the second end of the base arm; Arm head, the first end of which is connected to the second end of the intermediate arm; The intermediate arm includes an upper main chord, a lower main chord, a horizontal web member, and a diagonal web member. Adjacent upper main chords and / or lower main chords are connected by horizontal web members and diagonal web members. The wall thickness of the upper main chord and the lower main chord are different. Both the upper and lower main chords are equipped with lifting sections that cooperate with the auxiliary crane to tilt the intermediate arm. The lifting sections of the upper and lower main chords are arranged opposite each other.
2. The boom structure according to claim 1, characterized in that, The head arm, intermediate arm, and bottom arm are connected by pins.
3. The boom structure according to claim 1, characterized in that, The outer diameter of the upper main chord of the intermediate arm is the same as that of the lower main chord.
4. The boom structure according to claim 1, characterized in that, The intermediate arm includes several intermediate segments.
5. The boom structure according to claim 4, characterized in that, The outer diameters of the upper and lower main chords of adjacent intermediate arms are the same, but the wall thicknesses of the upper and lower main chords of adjacent intermediate arms are different.
6. The boom structure according to claim 1, characterized in that, The intermediate arm is a truss structure.
7. An engineering machinery, characterized in that, Includes the boom structure as described in any one of claims 1-6.
8. The engineering machinery according to claim 7, characterized in that, The construction machinery is a crawler crane.