Truss arm and crawler crane thereof
By using a multi-segment boom structure connected by composite nodes, the problem of insufficient lateral stiffness of the crawler crane boom is solved, the lateral deformation resistance and load bearing capacity are improved, and the lifting height of more than 160m in the wind power field is met Performance requirements.
Patent Information
- Application Number
- CN201910627366.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-07-12
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2039-07-12
AI Technical Summary
The lateral stiffness of the crawler crane is insufficient, which cannot meet the requirements of large-tonnage lifting, especially in the wind power field, for lifting heights above 160m, resulting in excessive lateral displacement and inability to meet the performance requirements.
A truss boom structure is adopted that is formed by the spaced connection between the multi-segment sub-branch and the composite node. The sub-branch is connected horizontally through the composite node to form an integrated boom, which increases the cross-sectional moment of inertia and improves the resistance to lateral deformation.
The crawler crane's resistance to lateral deformation and load bearing capacity is significantly improved, and the lifting performance requirements for large-bone wind power conditions is met. Through assembly convenience, the difficulty of directly producing large-section booms that cannot be separated is avoided.
Smart Images
Figure CN110217705B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a truss arm and a crawler crane thereof, belonging to the technical field of crane hoisting. Background Art
[0002] With the vigorous development and construction needs of the national infrastructure industry in recent years, the requirements for the lifting performance of crawler products, especially large-tonnage products, are getting higher and higher, which is particularly evident in the wind power field. At present, the required hoisting height of wind power has reached more than 160m. The single boom performance of conventional crawler cranes is far from meeting the requirements due to the lateral stiffness constraints. A new boom structure is urgently needed to solve the above problems.
[0003] The existing technology uses a rectangular boom cross section, which has the characteristics of nearly equal cross-sectional width and height. The boom is a mechanical model with one end fixed and the other end free in the rotation plane. When subjected to lateral loads such as wind load and rotation inertia force, lateral displacement will occur. The factor that determines the lateral displacement of the boom head in the long arm state is the cross-sectional inertia moment in the direction of the boom width. According to relevant national standards, the lateral displacement of the boom head shall not exceed 2% of the arm length. The moment of inertia provided by the current boom width is not enough to meet the lifting performance requirements of long-arm wind power conditions. Summary of the invention
[0004] The technical problems to be solved by the present invention are:
[0005] The invention mainly solves the technical problem that the performance of a crawler crane is constrained by the lateral rigidity of the boom, thus limiting the lifting performance.
[0006] The complete technical solution provided by the present invention is:
[0007] A truss arm, characterized in that it comprises an integrated arm frame composed of a plurality of composite nodes and a plurality of arm frames;
[0008] Any boom is composed of multiple sections of sub-booms and composite nodes that are detachably connected longitudinally at intervals. The sub-booms of the same transverse position section in several booms are arranged in parallel, and all the sub-booms of the transverse position section are transversely connected through the composite node.
[0009] Furthermore, the composite node is a single-leaf structure, a truss structure, a closed box type or a semi-closed box type.
[0010] Furthermore, the length of each composite node spans across all combined boom cross sections, and allows each boom to have a predetermined spacing.
[0011] Furthermore, two opposite side surfaces of each composite node are respectively connected to a sub-arm frame.
[0012] Furthermore, the wall thickness and length of each section of the boom are the same or different.
[0013] Furthermore, the sub-booms in the same transverse position section among the plurality of booms have the same length.
[0014] Furthermore, a plurality of the integrated booms are connected via transition sections.
[0015] Furthermore, the number of arms included in the plurality of integrated arms is the same or different.
[0016] Furthermore, at the outermost ends of the multiple integrated booms or a single integrated boom, one end is connected to the bottom arm through a transition section, and the other end is connected to the single boom through the bottom arm, and the outer end of the single boom is connected to the boom head.
[0017] A crawler crane, characterized in that it comprises the truss arm described in any one of the above items.
[0018] The beneficial effects achieved by the present invention are:
[0019] 1. The truss arm of the present invention effectively increases the cross-sectional inertia moment of the crawler crane's rotating surface (in the width direction of the arm), improves the truss arm's ability to resist lateral deformation, and significantly improves its carrying capacity.
[0020] 2. The process production, assembly and transportation are convenient. A large-section boom is formed by combining and connecting several small-section sub-booms to achieve the purpose of improving performance, avoiding the direct production of large-section booms that cannot be disassembled as a whole. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 is a truss arm of an embodiment of the present invention;
[0022] Figure 2 It is a composite node integrated boom of an embodiment of the present invention;
[0023] Figure 3 yes Figure 2 Left view of
[0024] Figure 4 yes Figure 2 Schematic diagram of the boom 1 in FIG.
[0025] Figure 5 is a truss arm of another embodiment of the present invention;
[0026] Figure 6 It is a composite node structure diagram of a single fan structure;
[0027] Figure 7 Is adopted Figure 6 Schematic diagram of integrated boom connection with composite nodes;
[0028] Figure 8 yes Figure 7Enlarged view of middle part I;
[0029] Fig. 9 yes Figure 7 Enlarged view of middle part II;
[0030] Fig.10 It is a composite node structure diagram of a variable width truss structure. DETAILED DESCRIPTION
[0031] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.
[0032] like Figure 1 As shown, the axial stiffness level of the boom is changed by the composite node integrated boom 100, 400, 500 and the transition sections 200, 300, 600, 700 connected at both ends. The specific connection scheme is that the bottom boom 800, transition section 600, composite node integrated boom 400, transition section 200, composite node integrated boom 100, transition section 300, composite node integrated boom 500, transition section 700, single boom 900, boom head 1000 are connected in sequence; wherein the transition section 200, transition section 300, transition section 600, transition section 700 have the same large width feature as the composite node integrated boom 100, 400, 500 at one end in the width direction, and the width at the other end is relatively narrow. wherein the composite node integrated boom 100, composite node integrated boom 400, composite node integrated boom 400 may be the same or different in number.
[0033] In this example, the number of arm groups of the composite node integrated arm 100 is 4, and the number of arm groups of the composite node integrated arm 400 and 500 is 2. When the number of integrated arm groups of each composite node is the same, the transition section 300 and the transition section 700 are retained as one group, and similarly, the transition section 200 and the transition section 600 are also retained as one group.
[0034] In other embodiments, only the composite node integrated boom 100 may be used, such as Figure 5 As shown, the number of groups of the composite node integrated boom 100 is 2, and the n boom sections are connected to each other (that is, the connected boom sections are independent of each other), and the overall boom has no transition section along the axial direction.
[0035] like Figure 2 , Figure 3 and Figure 4As shown, the composite node integrated boom 100 is composed of a plurality of booms 1, boom 2... boom n and a plurality of composite nodes 11, composite node 22... composite node nn. Any of the booms 1 is composed of sub-booms 1-1, sub-booms 1-2... sub-booms 1-m, and each sub-boom has its own wall thickness tn and length Ln (the wall thickness and length of each sub-boom can be the same or different). The sub-booms in the same transverse position segment of the plurality of booms are arranged in parallel, and all the sub-booms in the transverse position segment can be connected transversely through the composite node. At the same time, the composite node can connect the sub-booms in the same position segment of the same boom together in the axial direction, and finally a composite node is connected to form a composite node integrated boom 100, and the composite node integrated boom 100 has the characteristic that the width dimension B is significantly larger than the height dimension H.
[0036] Composite node structure, such as Figure 6 The structure is a single-leaf structure formed by welding the main support rod 1-1, the cross rod 1-2, the vertical rod 1-3, the diagonal rod 1-4, the joint 1-5, the joint 1-6 and other parts.
[0037] In another embodiment, the width of the composite nodes 1, 2...n is variable, and the structural form is not limited to a single-leaf structure, and can be a truss structure or other structural forms that can achieve the same function, such as Fig.10 The composite node structure of a variable width truss structure is shown in FIG. 1 , wherein the composite node integrated boom is formed by connecting the composite nodes of the truss structure nn'. Figure 5 shown.
[0038] Combination Figure 4 , Figure 7 , Figure 8 and Fig. 9 As shown, the use of Figure 6 The composite node integrated boom formed by the composite node connection of the single-leaf structure shown is further explained. In this embodiment, taking two booms 1 and 2 as examples, when connected, the joints 1-2-1 and 1-2-2 at both ends of the sub-booms 1-2 of the two booms are respectively connected to the joints 1-5 or 1-6 on the two composite node structures, and the joints are connected by the pin 3. The joints 1-5 or 1-6 can be respectively connected to the sub-booms 1-1 and the sub-booms 1-3, so that the booms 1 and 2 are continuously extended and connected along the axial direction to be assembled into a composite node integrated boom.
[0039] The composite node in the present invention is not limited to a single leaf structure or a truss structure, and its structural form can be a closed box type, a semi-closed box type, or other structural forms that can achieve the same purpose. Its frame construction component material is not limited to pipe welding, and can also be angle steel, square steel, or other cross-sectional specifications.
[0040] The connected arms of the present invention are hingedly fixed by pins, which can be replaced by bolts and nuts.
[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A truss arm, characterized in that: It includes an integrated boom consisting of a number of composite nodes and a number of booms; Each boom is composed of multiple sections of sub-booms and composite nodes that are detachably connected longitudinally at intervals. The sub-booms of the same transverse position section in several booms are arranged in parallel, and all the sub-booms of the transverse position section are transversely connected through the composite node; The composite node is a single-fan structure; The sub-booms of the same transverse position section in several booms are arranged in parallel, and all the sub-booms of the transverse position section are connected transversely through the composite node. At the same time, the composite node connects the sub-booms of the same position section in the same boom together in the axial direction, and several composite nodes are finally connected to form a composite node integrated boom. The composite node integrated boom has the characteristic that the width dimension B is significantly greater than the height dimension H; When the composite node is a single-leaf structure, it includes a main support rod, a cross rod, a vertical rod, an oblique rod and a joint; two joints are connected by a pin shaft; the cross rod and the vertical rod form a rectangular structure; the oblique rod connects two opposite corners of the rectangular structure; the main support rods are respectively arranged at the four corners of the rectangular structure, and their two ends are respectively connected to a joint, and are respectively connected to one end of the cross rod and the vertical rod.
2. The truss arm according to claim 1, characterized in that: The length of each composite node spans across all combined boom cross sections and allows a predetermined spacing between the booms.
3. The truss arm according to claim 1, characterized in that: Two opposite side surfaces of each composite node are respectively connected to a sub-arm frame.
4. The truss arm according to claim 1, characterized in that: The wall thickness and length of each section of the boom are the same or different.
5. The truss arm according to claim 1, characterized in that: The sub-jibs in the same transverse position section among a plurality of jibs have the same length.
6. The truss arm according to claim 1, characterized in that: A plurality of the integrated booms are connected via transition sections.
7. The truss arm according to claim 1, characterized in that: The number of arms included in the plurality of integrated arms is the same or different.
8. The truss arm according to claim 1 or 6, characterized in that: At the outermost ends of the multiple integrated booms or a single integrated boom, one end is connected to the bottom boom via a transition section, and the other end is connected to the single boom via a transition section, and the outer end of the single boom is connected to the boom head.
9. A crawler crane, characterized in that: Comprising a truss arm as claimed in any one of claims 1 to 8.