Ship-shaped truss arm and crawler crane thereof

Abstract

The utility model discloses a ship-shaped truss arm and a crawler crane thereof, which comprise a bottom knuckle arm, a middle arm, a top knuckle arm and ship-shaped truss arm transition joints, and the ship-shaped truss arm transition joints comprise a lower inclined transition joint and an upper inclined transition joint which are arranged in pairs and have opposite inclination angles. At least one pair of lower inclined transition section and upper inclined transition section is arranged between the bottom section arm and the top section arm, a section of middle arm is sequentially connected between the adjacent lower inclined transition section and upper inclined transition section, the lower inclined transition section at the end part is connected with the bottom section arm, and the upper inclined transition section at the end part is connected with the top section arm. The overall universality of the boom system is improved, and the design and production cost is reduced; pre-deformation in the direction opposite to the deformation direction after loading is generated when the boom system is unloaded, the actual deformation amount generated when the boom system reaches the limit is increased, and then the bearing capacity of the boom system is improved; the cantilever crane system adopting the design can effectively control the sectional dimension of the truss arm, facilitates transportation of the cantilever crane, and saves transportation cost.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery crane hoisting, and particularly relates to a ship-shaped truss boom and its crawler crane. Background Technology

[0002] Currently, given the increasing demand for lifting ultra-large equipment in large-scale engineering projects such as petroleum, petrochemical, nuclear power, wind power, and steel in China, crawler cranes are being used more and more in these projects, and their design and manufacturing are trending towards ultra-large sizes. These cranes have achieved significant improvements in lifting height, working range, and load-bearing capacity. However, this has also brought about complex and severe problems and challenges in the design, manufacturing, transportation, installation, and subsequent use of these cranes.

[0003] For the hoisting needs of ultra-large equipment, the mainstream solutions are as follows: 1. Multi-machine collaboration of conventional models, which is limited by high construction difficulty, high purchase cost and low performance utilization; 2. Special cranes (such as ring rail cranes), which are limited by the inability to travel with load, high requirements for the bearing capacity of the construction ground and long loading and unloading cycle; 3. Prefabricated booms, which are limited by high on-site assembly difficulty, high design and production difficulty and high cost.

[0004] The boom is one of the important components of a crawler crane. The boom of a crawler crane generally adopts a truss structure composed of main chord members 4 and web members 5, including bottom boom 1, intermediate boom 2, and top boom 3. The sections are connected by pins, and different boom length combinations can be achieved by increasing or decreasing the number of intermediate booms 2.

[0005] like Figure 1-3 , Figure 1 This is a schematic diagram of the boom structure of an existing crawler crane; Figure 2 yes Figure 1 A schematic diagram of the structure of a single intermediate arm of the boom shown; Figure 3 yes Figure 2 The diagram shows the end face of the intermediate boom. From a stress perspective, the boom is a bidirectional compression-bending member. That is, during crane lifting operations, the boom bears axial force and bending moment in both the luffing plane and the slewing plane. Therefore, from the boom cross-section analysis, sufficient cross-sectional area is needed to ensure the boom's strength and resist the axial force. Sufficient cross-sectional width B and height H are also needed to ensure the moments of inertia in both planes, thus resisting the bending moment. To improve the boom's load-bearing capacity, the most effective method is to increase the boom's cross-sectional dimensions. However, the height restrictions of transport vehicles and underpasses severely limit the increase in cross-sectional dimensions. Therefore, the following issues urgently need to be addressed: 1) Improving the load-bearing capacity of the boom system; 2) Ensuring that the boom's cross-sectional dimensions meet transport size requirements; 3) Controlling the weight of the truss boom and the boom system; 4) Ensuring the versatility of each truss boom section in the boom system. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a ship-shaped truss boom and its crawler crane.

[0007] This utility model is implemented as follows: a ship-shaped truss arm, including a bottom arm, an intermediate arm, and a top arm, characterized in that it also includes a ship-shaped truss arm transition section. The ship-shaped truss arm transition section includes a pair of downwardly inclined transition sections and upwardly inclined transition sections with opposite inclination angles. At least one pair of downwardly inclined transition sections and upwardly inclined transition sections are provided between the bottom arm and the top arm. Several intermediate arms are sequentially connected between adjacent downwardly inclined transition sections and upwardly inclined transition sections, forming a ship-shaped truss arm transition section assembly. The downwardly inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the bottom arm, and the upwardly inclined transition section at the end is connected to the top arm.

[0008] Preferably, the downwardly inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the bottom section arm through a series of sequentially connected intermediate arms.

[0009] Preferably, the upper inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the top section arm through a number of sequentially connected intermediate arms.

[0010] Preferably, the bottom arm, intermediate arm, top arm, lower inclined transition section, and upper inclined transition section are connected to each other by pins.

[0011] Preferably, the lower inclined transition section and the upper inclined transition section are arranged in a symmetrical structure.

[0012] Preferably, the downward-sloping transition section includes four main chords inclined downwards at one end and four corresponding sets of web members. The four main chords are of the same length and are arranged in parallel. A set of web members is evenly distributed between two adjacent main chords. The set of web members includes several staggered web members. The web members are inclined horizontally with the axis of the main chord as the horizontal direction, and the inclination angles of adjacent web members are opposite. The inclination angles of alternating web members are the same. The two ends of the main chords are provided with joints for connecting with other sections. A closing rod supporting the two adjacent chords is provided between the web members of adjacent main chords and the joints, and the closing rod is perpendicular to the main chord. One end of the four main chords of the upward-sloping transition section is inclined upwards, corresponding to the main chords of the downward-sloping transition section. The arrangement of the remaining structures is the same as that of the downward-sloping transition section.

[0013] Preferably, the web members of the two sets of web members arranged opposite to each other are staggered.

[0014] This utility model also provides a crawler crane that uses the above-mentioned ship-shaped truss arm.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) The design of the transition section of the ship-shaped truss boom based on the conventional boom can effectively control the cross-sectional dimensions of the truss boom, which is conducive to the transportation of the boom and saves transportation costs; it can be used in conjunction with the conventional boom to improve the overall versatility of the boom system and reduce design and production costs.

[0017] (2) Through the structural design of the ship-shaped truss arm, a pre-deformation opposite to the deformation direction after loading is generated when the boom system is unloaded, which increases the actual deformation when the boom system reaches its limit, thereby improving the load-bearing capacity of the boom system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the boom structure of an existing crawler crane;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of a single intermediate arm of the boom shown;

[0020] Figure 3 yes Figure 2 A schematic diagram of the end face of the intermediate arm shown.

[0021] Figure 4 This is a ship-shaped truss arm transition section structure according to one embodiment of the present invention;

[0022] Figure 5 This is a boat-shaped boom system according to one embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram illustrating the lifting performance principle of the boom system of an existing crawler crane;

[0024] Figure 7 This is a schematic diagram illustrating the lifting performance principle of a ship-shaped boom system according to an embodiment of the present invention.

[0025] In the diagram: 1. Bottom arm; 2. Intermediate arm; 3. Top arm; 4. Main chord member; 5. Web member; 100. Main chord member; 200. Web member assembly; 201. Web member; 300. Closing member; 400. Joint. Detailed Implementation

[0026] To further understand the utility model content, features and effects of this utility model, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0027] The structure of this utility model will now be described in detail with reference to the accompanying drawings.

[0028] Example 1:

[0029] like Figure 4 The diagram shows the ship-shaped truss arm transition section structure of this embodiment; as shown... Figure 5The embodiment shown provides an application such as Figure 4 The illustrated ship-shaped truss arm transition section structure includes a bottom arm, intermediate arms, and a top arm, as well as a ship-shaped truss arm transition section. The ship-shaped truss arm transition section includes a pair of downward-inclined transition sections and upward-inclined transition sections with opposite inclination angles. At least one pair of downward-inclined transition sections and upward-inclined transition sections are provided between the bottom arm and the top arm. Several intermediate arms are sequentially connected between adjacent downward-inclined transition sections and upward-inclined transition sections. After connection, they form a ship-shaped truss arm transition section assembly. The downward-inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the bottom arm, and the upward-inclined transition section at the end is connected to the top arm.

[0030] In this embodiment, a pair of downwardly inclined transition sections and an upwardly inclined transition section are provided between the bottom section arm and the top section arm.

[0031] The bottom arm, intermediate arm, top arm, lower inclined transition section, and upper inclined transition section are connected to each other by pins.

[0032] The lower inclined transition section and the upper inclined transition section are arranged in a symmetrical structure, such as Figure 4 As shown, the downward-sloping transition section includes four main chord members 100 inclined downwards at one end and four corresponding sets of web members 200. The four main chord members 100 are of the same length and arranged in parallel. A set of web members 200 is evenly distributed between two adjacent main chord members 100. Each set of web members 200 includes several staggered web members 201. The web members 201 are inclined horizontally with the axis of the main chord members 100 as the horizontal direction, and the inclination angles of adjacent web members 201 are opposite, while the inclination angles of alternating web members 201 are the same. Both ends of the main chord members 100 are provided with joints 400 for connecting with other sections. A closing rod 300 supporting two adjacent main chord members 100 is provided between the web members 200 of adjacent main chord members 100 and the joint 400, and the closing rod 300 is perpendicular to the main chord members 100. The staggered arrangement of the web members 201 of the two sets of opposite web members 200 is as follows: Figure 4 As shown, one end of the four main chords of the upper inclined transition section is inclined upwards, corresponding to the main chords of the lower inclined transition section. The arrangement of the rest of the structure is the same as that of the lower inclined transition section.

[0033] In this embodiment, the ship-shaped truss boom transition section structure is connected such that the downward-sloping transition section is located on the side closer to the bottom boom section, and the upward-sloping section is located on the side closer to the top boom section, thereby constructing a ship-shaped boom system with pre-deformation bending. Figure 5 As shown, a concave pre-deformation bending occurs when the boom is unloaded. When the boom is loaded, this pre-deformation bending counteracts the boom's deflection, increasing the actual deformation required for the entire boom system to reach its ultimate deformation, thereby enhancing the boom system's load-bearing capacity. The mechanical principle is as follows: Figure 6As shown, the existing truss boom deforms into L1 under the suspended load F, as follows. Figure 7 The ship-shaped boom shown in this embodiment requires an actual deformation of L1+H to achieve the same limit deformation, thus increasing the lifting weight from F to 1.x times F.

[0034] The downward-tilting transition section is connected in the same way as the conventional boom. It can adjust its installation position in the boom system according to the force and deformation of the boom, adapt to various boom combinations, and cover a variety of working conditions.

[0035] The ship-shaped boom system with the transition section structure of the ship-shaped truss boom in this embodiment can be applied to crawler cranes as an improvement to the crane truss boom.

[0036] In this embodiment, the bottom arm 1, intermediate arm 2, top arm 3, main chord member 4, web member 5, main chord member 100, web member group 200, web member 201, closing member 300, and joint 400 all adopt existing products or structures well known to those skilled in the art. For the connection methods between them that are not disclosed in this embodiment, existing connection methods well known to those skilled in the art are adopted, and will not be described in detail here.

[0037] Example 2:

[0038] The difference between this embodiment and Embodiment 1 is that: there are at least two pairs of downwardly inclined transition sections and upwardly inclined transition sections between the bottom arm and the top arm.

[0039] Example 3:

[0040] The difference between this embodiment and Embodiment 1 is that the downward inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the bottom arm through several intermediate arms connected in sequence.

[0041] Example 4:

[0042] The difference between this embodiment and Embodiment 1 is that the upper inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the top arm through several sequentially connected sections.

[0043] Embodiment 5:

[0044] The difference between this embodiment and Embodiment 1 is that the lower inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the bottom section arm through several sequentially connected intermediate arms, and the upper inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the top section arm through several sequentially connected intermediate arms.

[0045] Example 6:

[0046] The difference between this embodiment and Embodiment 1 is that the four main chords include two horizontally arranged long main chords of the same length and two short main chords of the same length. The long main chords are arranged above the short main chords. The long main chords, short main chords and corresponding web members form a trapezoidal cross section. When connecting, the trapezoidal boom is connected with the longer main chord below and the shorter main chord above. The boom system formed will also produce a concave pre-deformation bending.

[0047] It should be noted that, in this document, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ship-shaped truss arm, comprising a bottom arm, an intermediate arm, and a top arm, characterized in that: It also includes a ship-shaped truss arm transition section, which includes a pair of downwardly inclined transition sections and upwardly inclined transition sections with opposite inclination angles. At least one pair of downwardly inclined transition sections and upwardly inclined transition sections are provided between the bottom arm and the top arm. Several intermediate arms are connected in sequence between adjacent downwardly inclined transition sections and upwardly inclined transition sections. After being connected, they form a ship-shaped truss arm transition section assembly. The downwardly inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the bottom arm, and the upwardly inclined transition section at the end is connected to the top arm.

2. The ship-shaped truss arm as described in claim 1, characterized in that: The downward-sloping transition section at the end of the ship-shaped truss arm transition section assembly is connected to the bottom arm through several intermediate arms connected in sequence.

3. The ship-shaped truss arm as described in claim 1, characterized in that: The upper inclined transition section at the end of the ship-shaped truss arm transition section assembly is connected to the top section arm through several intermediate arms connected in sequence.

4. A ship-shaped truss arm as described in claim 1, characterized in that: The bottom arm, intermediate arm, top arm, lower inclined transition section, and upper inclined transition section are connected to each other by pins.

5. A ship-shaped truss arm as described in claim 1, characterized in that: The lower inclined transition section and the upper inclined transition section are arranged in a symmetrical structure.

6. A ship-shaped truss arm as described in claim 5, characterized in that: The downward-sloping transition section includes four main chord members (100) inclined downwards at one end and four corresponding sets of web members (200). The four main chord members (100) are of the same length and are arranged in parallel. A set of web members (200) is evenly distributed between two adjacent main chord members (100). The web members (200) include several staggered web members (201). The web members (201) are inclined horizontally with the axis of the main chord members (100) as the horizontal direction, and the inclination angle of adjacent web members (201) is the same. Conversely, the alternating web members (201) have the same inclination angle. The two ends of the main chord (100) are provided with joints (400) for connecting with other sections. Between the web member group (200) of the adjacent main chord (100) and the joint (400), there is a closing rod (300) that supports the two adjacent main chords (100) and the closing rod (300) is perpendicular to the main chord (100). One end of the four main chords of the upper inclined transition section is inclined upwards, corresponding to the main chord of the lower inclined transition section.

7. A ship-shaped truss arm as described in claim 6, characterized in that: The web members (201) of the two sets of web members (200) set opposite to each other in the transition section are arranged in an alternating manner.

8. A crawler crane, characterized in that: Includes the ship-shaped truss arm as described in any one of claims 1-7.

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