Foldable metamorphic truss arm segment, truss arm and crane

Abstract

This invention belongs to the field of engineering machinery, and particularly relates to a foldable and deformable truss boom segment, a truss boom, and a crane. The truss boom segment includes: two non-intersecting chords; at least two slide rails fixedly disposed on the chords, each slide rail having at least two fixed points; and at least two long web members connecting the two chords. Each long web member has at least one sliding end, the sliding end of which is slidable relative to the slide rail and can selectively connect with the at least two slide rail fixed points to allow the truss boom segment to be in different cross-sectional states. This invention achieves a slidable connection between the long web members and the chords by setting slide rails on the chords, allowing the truss boom segment to change its cross-sectional state through the sliding of the long web members relative to the chords. Without disassembling the truss boom segment, the cross-sectional area of ​​the truss boom can be easily and quickly changed to adapt to different requirements in transportation and working states.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery, and more particularly to a foldable and deformable truss boom section, truss boom, and crane. Background Technology

[0002] The truss boom (boom), composed of multiple boom sections, is a key load-bearing structural component in crane lifting processes. Its lifting performance, especially for long booms with small amplitudes, is directly affected by the boom's performance. To improve lifting capacity, truss booms often increase the cross-sectional area of ​​the boom sections. However, this increased cross-sectional area makes disassembly, assembly, and transportation extremely inconvenient, particularly for road transport, where the width, height, and length of transported items are strictly limited, restricting further increases in the boom section's cross-sectional area. Therefore, ensuring sufficient lifting capacity while meeting transportation regulations regarding truss boom transport dimensions has become a critical issue hindering the development of crawler cranes.

[0003] The relevant truss boom sections are often disassembled partially or entirely to meet transportation requirements, and then reassembled when needed for operation. This is time-consuming and labor-intensive, and repeated disassembly and reassembly can easily damage parts, affecting the working safety of the truss boom and crane. In addition, the cross-sectional area of ​​the relevant truss boom sections is fixed after assembly in the working state, and it is not possible to flexibly change the cross-sectional area according to the working conditions, which limits the scope of application. Summary of the Invention

[0004] At least one objective of this invention is to provide a foldable and deformable truss boom segment, truss boom, and crane. The numerous technical effects of the preferred technical solutions among the many technical solutions provided by this invention are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An embodiment of the present invention provides a foldable and deformable truss arm segment, comprising: two non-intersecting chords; at least two slide rails fixedly disposed on the chords, each slide rail having at least two slide rail fixing points; and at least two long web members connecting the two chords, each long web member having at least one sliding end, the sliding end of the long web member being slidable relative to the slide rail and selectively connected to the at least two slide rail fixing points, so that the truss arm segment is in different cross-sectional states.

[0007] In some embodiments of the truss arm segment, the at least two long web members are arranged in pairs and the intersection point is used as the hinge point to form an X-shaped long web member group. The two adjacent groups of X-shaped long web members are then hinged to each other through the non-sliding ends of the long web members to form a parallelogram support structure with four hinge points as vertices. The shape of the parallelogram support structure can be changed according to the cross-sectional state of the truss arm segment.

[0008] In some embodiments of the truss arm segment, the support structure formed by the four hinge points as vertices is rhomboid.

[0009] In some embodiments of the truss boom segment, the truss boom segment further includes: a sealing web member, the two ends of which are respectively connected to the slide rail fixing points on the two chord members corresponding to the slide rails.

[0010] In some embodiments of the truss boom segment, the sealing web member is a telescopic sleeve structure, and the length of the sealing web member can be changed according to the cross-sectional state of the truss boom segment.

[0011] In some embodiments of the truss boom segment, the sealing web member further includes a locking unit capable of locking the sealing web member.

[0012] In some embodiments of the truss boom segment, the sealing web member further includes a telescopic drive device capable of driving the telescopic movement of the sealing web member.

[0013] In some embodiments of the truss boom segment, the sealing web member further includes a bending joint, the sealing web member can be bent around the bending joint, and form a set bending angle according to the cross-sectional state of the truss boom segment.

[0014] In some embodiments of the truss boom segment, the truss boom segment further includes: at least two short web members, each end of which is detachably connected to the chord member and the sealing web member, forming a triangular support structure surrounded by the short web members, the chord member, and the sealing web member.

[0015] In some truss boom segment embodiments, one end of each of the short web members is slidably connected to the slide rail, and the other end is hinged to the short web member connected to the same sealing web member, so that when the sealing web member is removed, the included angle between the short web members can change according to the cross-sectional state of the truss boom segment.

[0016] In some embodiments of the truss boom segment, the slide has a slide drive mechanism that can drive the long web member to slide along the slide.

[0017] The present invention also provides a foldable and deformable truss arm, comprising: at least two truss arm segments as described in the preceding embodiments, wherein the at least two truss arm segments are connected along the length direction of the truss arm.

[0018] In some truss arm embodiments, the at least two truss wall arm sections are in at least two cross-sectional states.

[0019] In some truss arm embodiments, a transition arm is also included for connecting truss wall arm sections in different cross-sectional states.

[0020] The present invention also provides a crane including any of the truss boom embodiments described above.

[0021] Based on the above technical solution, the embodiments of the present invention can produce at least the following technical effects:

[0022] By setting slide rails on the chord members, a slidable connection between the long web members and the chord members is achieved. This allows the truss arm segment to change its cross-sectional state by sliding the long web members relative to the chord members. Without disassembling the truss arm segment, the cross-sectional area of ​​the truss arm can be changed simply and quickly to adapt to different requirements in transportation and working conditions. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram illustrating the working state of the truss arm in the relevant technology.

[0025] Figure 2 This is a schematic diagram illustrating the transportation status of the truss arm for related technologies.

[0026] Figure 3 This is a schematic diagram of the working cross-section of an embodiment of the truss boom section of the present invention;

[0027] Figure 4 This is a schematic diagram of the transport section state of one embodiment of the truss arm segment of the present invention;

[0028] Figure 5 This is a schematic diagram of the chord structure of one embodiment of the truss arm segment of the present invention;

[0029] Figure 6 This is a schematic diagram of the working state of another embodiment of the truss boom section of the present invention;

[0030] Figure 7 This is a schematic diagram of a retracted transport section state in another embodiment of the truss boom segment of the present invention;

[0031] Figure 8 This is a schematic diagram of another retracted state to the transport section in another embodiment of the truss boom section of the present invention;

[0032] Figure 9 This is a schematic diagram of the working state of another embodiment of the truss boom section of the present invention;

[0033] Figure 10 This is a schematic diagram of a retracted transport section state in another embodiment of the truss boom segment of the present invention;

[0034] Figure 11 This is a schematic diagram of another retracted transport section state of the truss boom segment in another embodiment of the present invention;

[0035] Figures 12(a)-(b) are schematic diagrams of two embodiments of the truss arm of the present invention. Detailed Implementation

[0036] The following description, along with the accompanying drawings and text, will help you understand the content of this invention and the differences between it and related technologies. The technical solutions, including preferred solutions, of this invention will be further described in detail below through the accompanying drawings and by listing some optional embodiments.

[0037] It should be noted that any technical feature or technical solution in this embodiment is one or more of a variety of optional technical features or optional technical solutions. For the sake of brevity, this document cannot exhaustively list all alternative technical features and alternative technical solutions of the present invention, nor is it convenient to emphasize that the implementation of each technical feature is one of a variety of optional implementations. Therefore, those skilled in the art should know that any technical means provided by the present invention can be replaced or any two or more technical means or technical features provided by the present invention can be combined to obtain a new technical solution.

[0038] Any technical features and solutions within this embodiment do not limit the scope of protection of this invention. The scope of protection of this invention should include any alternative technical solutions that can be conceived by those skilled in the art without creative effort, as well as new technical solutions obtained by those skilled in the art by combining any two or more technical means or technical features provided by this invention.

[0039] This invention provides a foldable and deformable truss boom section, a truss boom, and a crane. The following description, in conjunction with the accompanying drawings, further details this invention. Figures 1-1 2. A more detailed description of the technical solution provided by the present invention is provided below:

[0040] like Figures 1-2The diagram shows the relevant truss arms in their working and transport states. In the working state, two truss arm assemblies need to be assembled into a single arm section, while during transport, a single arm section is disassembled into two truss arm assemblies and transported with staggered web members. This structural form of the truss arm is not only complex and cumbersome during deformation operations, but also results in insufficient structural strength in the working state because the key stress points are all at the connection points between the truss arm assemblies.

[0041] like Figures 3-5 As shown, this invention provides an embodiment of a foldable and deformable truss arm segment, comprising two non-intersecting chords 1, wherein the chords, also referred to as single-segment structures, are primarily constructed of welded tubular and / or sheet metal, used to bear tensile and compressive loads along the length of the truss arm. Furthermore, the chords 1 are configured to be non-intersecting, including along... Figure 3 Parallel state in viewpoint, or along Figure 3 The non-parallel and non-intersecting states in the perspective are adapted to the different connection needs of truss arm segments.

[0042] The truss boom segment also includes at least two slide rails 3 fixedly mounted on the chord 1. The slide rails 3 can be located on the inner sides of the corresponding chord 1 facing each other, or on the sides of the corresponding chord 1 facing each other. Furthermore, the slide rails 3 can be in the form of rails installed on the chord, or in the form of grooves or tracks within the chord. Each slide rail 3 has at least two fixing points to ensure that the truss boom segment can be stably maintained in both the transport section and the working section states. Multiple fixing points are also possible to allow for selection of multiple section states of the truss boom segment to meet different load conditions. The section state specifically refers to the state along... Figure 3 The size and shape of the area enclosed by the two chords 1 in the field of view.

[0043] The truss arm segment also includes at least two long web members 2, connecting the two chord members 1. Each long web member 2 has at least one sliding end, which is slidable relative to the slide rail 3 and can selectively connect to the at least two slide rail fixing points to allow the truss arm segment to be in different cross-sectional states. The long web members 2 can be slidably connected to the slide rail 3 at both ends to achieve better deformation effects, or they can be hinged at one end and slidably connected at the other end to ensure better load-bearing stability of the truss arm in the working cross-sectional state and reduce fixing difficulty. Furthermore, the number of long web members 2 can be four or more. When there are four long web members 2, each long web member can be connected by hinge at one end and sliding at the other. When there are more than four long web members 2, for example, six long web members 2, in order to ensure the deformability of the truss arm segment, two of the long web members 2 can be connected by hinge at one end and sliding at the other, while the other four long web members 2 need to be connected by sliding at both ends. Those skilled in the art should be able to understand that the number of hinge points between multiple long web members 2 and the same chord member 1 should not exceed one; otherwise, over-positioning will occur, preventing the truss arm segment from folding and deforming.

[0044] like Figure 3 The slidable end of the long web member 2 shown can move along the length of the chord member 1. In this case, the slide rail 3 is also oriented along the length of the chord member 1. When at least two long web members 2 are hinged to the chord member 1, the slide rail 3 can be located on both sides of the chord member 1 to save on the length of the slide rail 3 and reduce manufacturing and maintenance costs. However, when all at least two long web members 2 are slidably connected to the chord member 1, the slide rail 3 should be distributed along the entire length of the chord member 1. In this case, all long web members can slide along the slide rail 3 to maximize the folding deformation of the truss arm segment.

[0045] In addition, the slide rail 3 can also be set to not be along the length of the chord 1. Those skilled in the art should be able to imagine that the truss arm segment is a three-dimensional structure. When the slide rail 3 is set along the direction perpendicular to the length of the chord 1, the long web member 2 can still slide along the slide rail 3 through its slidable end, thereby folding or unfolding the truss arm segment.

[0046] like Figure 3As shown, at least two long web members 2 are arranged in pairs, with the intersection point as the hinge point to form an X-shaped long web member group. Adjacent groups of X-shaped long web members are then hinged together through the non-sliding ends of the long web members 2, forming a parallelogram support structure with four hinge points as vertices. The parallelogram support structure can change shape according to the cross-sectional state of the truss arm segment. The parallelogram support structure effectively utilizes the deformability of the parallelogram, and the parallelogram support structure and chord 1 also form multiple sets of triangular supports, enhancing the overall strength of the truss arm segment. The parallelogram support structure is formed with four hinge points as fixed points. In fact, when the long web members 2 are not on the same plane, for example, when the two long web members 2 of each X-shaped long web member group are located on two different planes, the long web members 2 do not intersect and cannot form a hinged connection. However, those skilled in the art should understand that the two groups of X-shaped long web members still exist and extend along... Figure 3 From this perspective, the support connection method formed by adjacent X-shaped long web members can be regarded as the parallelogram support structure described in this invention. At this time, the four sides of the parallelogram support structure are not coplanar, but it can still ensure the good folding deformation capability of the truss arm segment, as well as the good support capability of the triangular support structure formed by the X-shaped long web members and the chord 1.

[0047] Furthermore, the support structure formed by the four hinge points as vertices is rhomboid, which enables the truss arm segment to obtain better shear and bending resistance. The long web members containing the four sides of the rhomboid support structure may or may not be coplanar, and the corresponding technical effects will not be elaborated further.

[0048] like Figure 3 , Figure 4 The diagram illustrates an embodiment of the truss arm segment of the present invention in both the working section and the transport section states. In the working section state, the long web member 2 is fixed to a corresponding fixed point on the slide rail 3. The fixing method can be bolted or other feasible connection methods. In this state, the distance between the chord members 1 is relatively large, resulting in a larger cross-sectional area for the truss arm segment and enhanced load-bearing capacity. In the transport section state, the long web member 2 is fixed to a corresponding fixed point on the slide rail 3. In this state, the distance between the chord members 1 is smaller, which can meet the dimensional requirements of the transported goods in long-distance transport environments. Those skilled in the art should be able to recognize that, to cope with different load conditions or environmental conditions, the slide rail 3 can also be equipped with fixed points corresponding to other section states to achieve flexible adjustment and fixing of the truss arm segment's cross-sectional area. In particular, the slide rail 3 can also adopt a dynamic fixing method, such as using wedge pins or clips, to fix the slidable end of the long web member 2 at any position on the slide rail 3 to meet the needs of flexible adjustment.

[0049] like Figures 6-8 As shown, another embodiment of the truss arm segment provided by the present invention further includes: a sealing web member 4, with both ends connected to the corresponding slide rail fixing points on the two chord members 1. The sealing web member 4 can, on the one hand, support the chord members 1 and bear the bending action of the truss arm, ensuring that the truss arm segment does not fail due to the constraint force of the slide rail fixing points on the long web member 2 when subjected to large bending loads. On the other hand, it can enable the truss arm segment to be in a position such as... Figure 7 , 8 In the transport state shown, the long web member 2 is prevented from sliding further laterally outward of the truss arm segment, thus stabilizing the structure of the truss arm segment in the transport state.

[0050] like Figure 7 As shown, the sealing web member 4 is a telescopic sleeve structure, and its length can be changed according to the cross-sectional state of the truss arm segment. In this case, the sealing web member also includes a locking unit 41, which can lock the sealing web member 4. The locking unit can be in the form of a pin or clamp, and has multiple locking states corresponding to different cross-sectional states of the truss arm segment. In this case, the truss arm segment can be fixed solely by the locking unit 41. For example, in the working cross-sectional state, the locking unit 41 is in the working cross-sectional locking state, at which time the length of the sealing web member 4 is the longest, maximizing the spacing between the connected chord members 1, thus meeting the cross-sectional area requirements in the working cross-sectional state. Correspondingly, the locking unit 41 can also keep the sealing web member 4 at a shorter length, resulting in a smaller spacing between the chord members 1 and better transport performance.

[0051] To further enhance the automatic extension and retraction capability of the truss boom segments and improve the ease of operation and deformation rate of folding deformation, the sealing web member 4 also includes a telescopic drive device. This device can drive the extension and retraction of the sealing web member 4. The telescopic drive device can be a hydraulic cylinder structure, controlled by hydraulic or electronic switches, to more conveniently control the deformation of the truss boom. Especially for large single-unit truss boom segments, the telescopic drive device can significantly accelerate the folding deformation rate of the truss boom. Furthermore, the telescopic drive device also enables flexible switching between different cross-sectional states of the truss boom segments during operation, broadening the applicability of the truss boom segments.

[0052] like Figure 8As shown, the sealing web member 4 also includes a bending joint 42. The sealing web member 4 can be bent around the bending joint 42, and forms a set bending angle according to the cross-sectional state of the truss arm segment. The bending joint 42 can cause the sealing web member 4 to bend inwards towards the truss arm segment to achieve a smaller cross-sectional area in the transport section, or it can cause the sealing web member 4 to bend outwards towards the truss arm to achieve a larger bending angle, thereby obtaining a smaller spacing between the chord members 1. In addition, the bending joint 42 may also include a locking device, such as a hook, to maintain the sealing web member 4 at the set bending angle, thereby improving the structural stability of the truss arm segment under different cross-sectional states.

[0053] like Figures 9-11 As shown, another embodiment of the truss arm segment provided by the present invention further includes at least two short web members 5, which are detachably connected at both ends to the chord member 1 and the sealing web member 4, respectively, forming a triangular support structure surrounded by the short web members 5, the chord member 1 and the sealing web member 4, so as to further enhance the stability of the truss arm segment.

[0054] Because of the use of short web members 5 for fixing, two sets of positioning relationships are formed between the chord member 1 and the sealing web member 4 in the truss arm segment. Therefore, when changing the cross-sectional state of the truss arm segment, it is necessary to select and remove one of the positioning relationships between the chord member 1 and the sealing web member 4. For example... Figure 10 As shown, by removing the short web member 5, a positioning relationship between the chord member 1 and the sealing web member 4 is released, allowing the truss arm segment to fold and deform. And as... Figure 11 As shown, the sealing web members 4 are removed. At this time, one end of each short web member 5 is slidably connected to the slide rail 3, and the other end is hinged to the short web member 5 connected to the same sealing web member 4, so that when the sealing web member 4 is removed, the included angle between the short web members 5 can change according to the cross-sectional state of the truss arm segment.

[0055] Furthermore, to better achieve the folding and deformation of the truss arm segments, the slide rail 3 may also have a slide rail drive mechanism, which can drive the long web member 2 to slide along the slide rail 3. The slide rail drive mechanism can be in the form of a piston, hydraulic cylinder, etc., and is driven by a hydraulic or electric motor to improve the deformation capability of the truss arm segments.

[0056] As shown in Figures 12(a) and (b), the present invention also provides a foldable and deformable truss arm, comprising at least two truss arm segments as described above, wherein the at least two truss arm segments are connected along the length direction of the truss arm. The truss arm assembled from at least two truss arm segments not only allows for control of the cross-sectional state to adapt to different working conditions, but also allows for flexible length selection and rapid maintenance in case of a failure in one truss arm segment. Specifically, due to the modular design, the truss arm segments can be interconnected via joints. Except for transition segments used to connect different cross-sectional states, segments with the same cross-sectional state can be connected in any order. This enables targeted maintenance or replacement of the truss arm in case of failure, significantly reducing maintenance costs and improving repair efficiency.

[0057] Furthermore, to enhance the overall stability of the truss boom sections under the same conditions and improve the performance and lifting height of cranes of the same tonnage in long boom, small-amplitude working conditions, the at least two truss boom sections are in at least two cross-sectional states. For example, the present invention effectively enhances the overall stability of the truss boom by providing a combination of truss boom sections with larger cross-sectional areas and truss boom sections in the original cross-sectional state.

[0058] To connect the truss arm segments with the aforementioned two cross-sectional states, the truss arm provided by this invention also includes a transition segment for connecting truss wall segments with different cross-sectional states. The transition segment can adopt a structure similar to the aforementioned segments and is also configured as a foldable and deformable structure, allowing the overall truss arm to change its dimensions according to working conditions and environmental factors. The transition segment can also be directly connected to achieve a simpler structure and a more robust connection.

[0059] The present invention also provides a crane, including the truss boom described above. Compared to... Figures 1-2 Regarding the related truss arm shown, it has at least one of the following beneficial technical effects:

[0060] Improve work efficiency: Compared with existing variable cross-section solutions in the industry, the entire cross-section change process of this invention is simple and convenient, requires less manual intervention, and can effectively reduce labor intensity and improve work efficiency.

[0061] Reducing equipment investment costs: Tracked cranes have a fixed boom section at the factory. To achieve greater lifting capacity, a tracked crane with a larger lifting capacity needs to be purchased, increasing equipment investment costs. This invention improves the crane's lifting capacity at a smaller working radius by simply replacing a portion of the intermediate boom section without altering the rest of the equipment's structure. Furthermore, this modification requires only a minimal investment.

[0062] Modular design for easy maintenance: This invention adopts a modular design, dividing the boom into multiple detachable modules, which facilitates later maintenance.

[0063] To solve the problem of large-section booms not meeting transportation regulations, this invention can reduce the cross-sectional dimensions of the boom during transportation, so that the boom size meets the requirements of transportation regulations.

[0064] Furthermore, if the present invention discloses or relates to mutually fixedly connected components or structural parts, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral molding process).

[0065] Furthermore, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this invention include states or shapes that are similar to, analogous to, or close to those states or shapes. Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured using a one-piece molding process.

[0066] In the description of this invention, if terms such as "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used, the orientation or positional relationship indicated by the above terms is based on the orientation or positional relationship shown in the accompanying drawings. These terms are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the equipment, mechanism, component, 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 limiting the scope of protection of this invention.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A foldable and deformable truss boom segment, comprising: Two non-intersecting chords (1); At least two slides (3) are fixedly installed on the chord (1), and each slide (3) has at least two slide fixing points. The slides (3) are located on both sides of the chord (1) or the slides (3) are arranged to be distributed along the entire length of the chord (1). At least two long web members (2) connect the two chord members (1), and each of the long web members (2) has at least one sliding end, the sliding end of the long web member (2) is slidable relative to the slide rail (3) and can be selectively connected to the fixed points of the at least two slide rails so that the truss arm segment is in different cross-sectional states; and The sealing web rod (4) is connected at both ends to the corresponding slide rail (3) fixing points on the two chord rods (1); The slide (3) has a slide drive mechanism that can drive the long web rod (2) to slide along the slide (3).

2. The truss boom section according to claim 1, characterized in that, The at least two long web members (2) are arranged in pairs and the intersection point is used as the hinge point to form an X-shaped long web member group. The two adjacent groups of X-shaped long web members are then hinged to each other through the non-sliding end of the long web members (2) to form a parallelogram support structure with four hinge points as vertices. The shape of the parallelogram support structure can be changed according to the cross-sectional state of the truss arm section.

3. The truss boom section according to claim 2, characterized in that, The support structure formed by the four hinge points is rhomboid.

4. The truss boom section according to claim 1, characterized in that, The sealing web member (4) is a telescopic sleeve structure, and the length of the sealing web member (4) can be changed according to the cross-sectional state of the truss arm section.

5. The truss boom section according to claim 4, characterized in that, The sealing rod also includes a locking unit (41) which can lock the sealing rod (4).

6. The truss boom section according to claim 4, characterized in that, The sealing rod (4) also includes a telescopic drive device, which can drive the telescopic movement of the sealing rod (4).

7. The truss boom section according to claim 1, characterized in that, The sealing web member (4) also includes a bending joint (42), which can be bent around the bending joint (42) and form a set bending angle according to the cross-sectional state of the truss arm section.

8. The truss boom section according to claim 1, characterized in that, Also includes: At least two short web members (5) are detachably connected at both ends to the chord member (1) and the sealing web member (4), forming a triangular support structure surrounded by the short web members (5), the chord member (1) and the sealing web member (4).

9. The truss boom section according to claim 8, characterized in that, One end of each of the short web members (5) is slidably connected to the slide rail (3), and the other end is hinged to the short web member (5) connected to the same sealing web member (4), so that when the sealing web member (4) is removed, the included angle between the short web members (5) can change according to the cross-sectional state of the truss arm segment.

10. A foldable and deformable truss arm, characterized in that, include: At least two truss arm segments as described in claim 1, the at least two truss arm segments being connected along the length direction of the truss arm.

11. The truss arm according to claim 10, characterized in that, The at least two truss arm sections are in at least two cross-sectional states.

12. The truss arm according to claim 11, characterized in that, Also includes: Transition booms are used to connect truss boom sections at different cross-sectional states.

13. A crane, characterized in that, Including the truss arm as described in any one of claims 10 to 12.

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