Mechanical arm assembly and construction machinery

Abstract

The utility model relates to the technical field of construction machinery, and discloses a mechanical arm assembly which comprises a first arm section, a second arm section and an elastic piece arranged between the first arm section and the second arm section, the first arm section is arranged in the second arm section in a sleeved mode, and a gap is formed between the first arm section and the second arm section. The elastic piece abuts against the outer wall of the first arm section and the inner wall of the second arm section, and in the axial telescopic movement process of the first arm section relative to the second arm section, the elastic piece can keep abutting against the outer wall of the first arm section and the inner wall of the second arm section through elastic deformation when a gap of the position where the elastic piece is located changes. The gap between the first arm section and the second arm section can be effectively adjusted by arranging the elastic piece, the mechanical performance and the bearing capacity of the mechanical arm can be improved, abrasion between the arm sections is avoided, and the service life is effectively prolonged. The utility model further discloses a construction machine.

Description

Technical Field

[0001] This application relates to the field of construction machinery technology, and in particular to a robotic arm assembly and construction machinery. Background Technology

[0002] The telescopic boom is one of the core components of a crane, and its structure and types have continuously evolved with technological advancements. Telescopic booms are widely used in construction machinery such as truck cranes, and their design requires lightweight construction and strong bending resistance; common cross-sectional shapes are elliptical or square. Telescopic booms typically consist of multiple boom sections with gaps between adjacent sections. Currently, most boom sections use a uniform cross-section and uniform gap design, resulting in material redundancy and making it difficult to meet lightweight requirements.

[0003] To reduce weight, new designs such as irregular cross-sections, tapered cross-sections, and non-uniform thickness designs are gradually being adopted, but these also bring new problems. Traditional constant clearance designs adjust the clearance using sliders with fixed thickness, which cannot adapt to structures with varying clearances. Forcing their use can lead to boom wear and cause abnormal phenomena such as downward deflection or lateral bending, reducing the mechanical performance and service life of the telescopic boom, and even causing safety accidents. Therefore, optimizing the clearance adjustment mechanism to adapt to new designs has become an urgent technical challenge. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a robotic arm assembly and construction machinery.

[0005] This utility model provides a robotic arm assembly, including: a first arm segment, a second arm segment, and an elastic member disposed between the first arm segment and the second arm segment. The first arm segment is sleeved inside the second arm segment, and there is a gap between the first arm segment and the second arm segment. The elastic member abuts against the outer wall of the first arm segment and the inner wall of the second arm segment respectively. During the axial extension and retraction movement of the first arm segment relative to the second arm segment, the elastic member can maintain abutment against the outer wall of the first arm segment and the inner wall of the second arm segment respectively by elastic deformation according to the change of the gap at the position of the elastic member.

[0006] In one embodiment, the elastic member includes a deformable portion and abutment portions respectively connected to both sides of the deformable portion. The deformable portion abuts against one of the outer wall of the first arm segment and the inner wall of the second arm segment, and the abutment portions abut against the other of the outer wall of the first arm segment and the inner wall of the second arm segment. During the axial extension and retraction movement of the first arm segment relative to the second arm segment, the deformable portion can maintain abutment against one of the outer wall of the first arm segment and the inner wall of the second arm segment by elastic deformation when the gap at the position of the elastic member changes.

[0007] In one embodiment, the deformable portion includes a first deformable portion and a second deformable portion respectively disposed on both sides of the first deformable portion. The longitudinal section of the first deformable portion has an arc-shaped profile, and the longitudinal section of the second deformable portion has a straight profile. One end of the second deformable portion is connected to the first deformable portion, and the other end is connected to the abutting portion. The first deformable portion abuts against one of the outer wall of the first arm segment and the inner wall of the second arm segment.

[0008] In one embodiment, the distance between the lines connecting the abutting portions on both sides of the deformed portion is L. The second deformed portions on both sides of the first deformed portion are at the same height as the two contact points connected to the first deformed portion, and the perpendicular bisectors of the lines connecting the two contact points intersect between 1 / 5L and 4 / 5L of the line connecting the abutting portions on both sides.

[0009] In one embodiment, the center of curvature of the arcuate profile of the longitudinal section of the first deformed portion is on the vertical axis.

[0010] In one embodiment, the robotic arm assembly further includes a first fixing member, wherein one of the abutting portions is fixedly connected to one of the outer wall of the first arm segment and the inner wall of the second arm segment via the first fixing member.

[0011] In one embodiment, the robotic arm assembly further includes a first limiting groove, which is disposed on one of the outer wall of the first arm segment and the inner wall of the second arm segment, and the abutting portion is located in the first limiting groove and can slide within the first limiting groove.

[0012] In one embodiment, the robotic arm assembly further includes a support base, the deformable portion abutting against one of the outer wall of the first arm segment and the inner wall of the second arm segment, the abutting portion abutting against the support base, and the support base being fixed to the other of the outer wall of the first arm segment and the inner wall of the second arm segment.

[0013] In one embodiment, the support base includes a support base body and a second limiting groove. The second limiting groove is disposed on the support base body, and the abutting part is located in the second limiting groove and can slide in the second limiting groove. The robotic arm assembly also includes a second fixing member. The support base body is fixedly connected to one of the outer wall of the first arm segment and the inner wall of the second arm segment through the second fixing member.

[0014] Another embodiment of this application provides a construction machine, including a chassis and a robotic arm assembly provided in the foregoing embodiments, the robotic arm assembly being located on the chassis.

[0015] The beneficial effects of this utility model are as follows: by setting elastic members that can abut against the first and second arm sections respectively, the gap between the first and second arm sections can be effectively adjusted and supported. This not only improves the mechanical performance and load-bearing capacity of the robotic arm, but also avoids wear between the arm sections, effectively extending its service life and preventing safety accidents. At the same time, the structure is simple and easy to manufacture, and is convenient for installation and maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the longitudinal section of the elastic element of the robotic arm assembly in an embodiment of the present invention when it is not under compression.

[0018] Figure 2 for Figure 1 A schematic diagram of the structure at point B.

[0019] Figure 3 This is a schematic diagram of the longitudinal section of the elastic element of the robotic arm assembly in a compressed state according to an embodiment of the present invention.

[0020] Figure 4 for Figure 3 A schematic diagram of the structure at point C.

[0021] Figure 5 This is a schematic diagram of the longitudinal section of the elastic element of the robotic arm assembly in an embodiment of the present invention when it is not under compression.

[0022] Figure 6 for Figure 5 A schematic diagram of the structure at point D.

[0023] Figure 7 This is a schematic diagram of the longitudinal section of the elastic element of the robotic arm assembly in a compressed state according to an embodiment of the present invention.

[0024] Figure 8 for Figure 7 A schematic diagram of the structure at point E in the middle.

[0025] Figure 9 This is a schematic diagram of the longitudinal section of the elastic element of the robotic arm assembly in an embodiment of the present invention when it is not under compression.

[0026] Figure 10 for Figure 9A schematic diagram of the structure at point F.

[0027] Figure 11 This is a schematic diagram of the longitudinal section of the elastic element of the robotic arm assembly in a compressed state according to an embodiment of the present invention.

[0028] Figure 12 for Figure 11 A schematic diagram of the structure at point G.

[0029] Figure 13 This is a schematic diagram of the longitudinal section of the elastic element of the robotic arm assembly in an embodiment of the present invention when it is not under compression.

[0030] Figure 14 This is a schematic diagram of the longitudinal section of the elastic element of the robotic arm assembly in a compressed state according to an embodiment of the present invention. Detailed Implementation

[0031] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. Based on the description of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect," etc., 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. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0033] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, and do not 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 utility model.

[0034] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0035] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0036] Please refer to Figures 1-14 The illustration shows a robotic arm assembly provided in an embodiment of the present invention, including: a first arm segment 2, a second arm segment 3, and an elastic member 1 disposed between the first arm segment 2 and the second arm segment 3. The first arm segment 2 is sleeved inside the second arm segment 3, and there is a gap 7 between the first arm segment 2 and the second arm segment 3. The elastic member 1 abuts against the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3 respectively. During the axial extension and retraction movement of the first arm segment 2 relative to the second arm segment 3, the elastic member 1 can maintain abutment against the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3 respectively by elastic deformation when the gap 7 at the position of the elastic member 1 changes.

[0037] During the axial extension and retraction movement of the first arm segment 2 relative to the second arm segment 3, when the gap 7 between the first arm segment 2 and the second arm segment 3 gradually increases or decreases, or suddenly increases or decreases, due to the squeezing force from the first arm segment 2 or the second arm segment 3, in order to maintain contact with the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3 respectively, the elastic element 1 undergoes elastic deformation, causing the height H of the elastic element 1 to adjust accordingly to cope with the change in gap 7. This not only provides support for the first arm segment 2 and the second arm segment 3, avoiding wear between the arm segments, but also prevents the decrease in the mechanical performance and load-bearing capacity of the robotic arm, thereby improving the mechanical performance, load-bearing capacity and service life of the robotic arm, avoiding the occurrence of safety accidents. At the same time, such a structure is simple and easy to manufacture, and is convenient for installation and maintenance.

[0038] In one embodiment, the elastic element 1 can be a leaf spring, a sheet spring, or other components with elastic recovery effect, which is not limited here. The elastic element 1 can be configured in multiple ways according to the varying gap 7 between the first arm segment 2 and the second arm segment 3. For example, during the axial extension and retraction movement of the first arm segment 2 relative to the second arm segment 3, the gap between the upper and lower regions of the first arm segment 2 and the second arm segment 3 in the vertical direction changes. Elastic elements 1 can be respectively set at the gap 7 at the upper and lower ends of the first arm segment 2 and the second arm segment 3 (e.g., ...). Figures 13-14 (as shown); for example, the gap between the left and right regions in the horizontal direction of the first arm section 2 and the second arm section 3 is variable. Elastic elements 1 can be set at the gaps at the left and right ends of the first arm section 2 and the second arm section 3 respectively; it is even possible to set elastic elements 1 at the diagonal gaps between the first arm section 2 and the second arm section 3. The specific number and position of these elastic elements are not limited, and users can adjust them according to design needs.

[0039] In one embodiment, the elastic member 1 includes a deformable portion 11 and abutment portions 12 connected to both sides of the deformable portion 11. The deformable portion 11 abuts against one of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3, and the abutment portions 12 abut against the other of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3. During the axial extension and retraction movement of the first arm segment 2 relative to the second arm segment 3, the deformable portion 11 can maintain abutment against one of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3 by elastic deformation when the gap 7 at the position of the elastic member 1 changes.

[0040] In one embodiment, the elastic element 1 is disposed at the first end of the first arm segment 2 and the second arm segment 3. The deformable part 11 abuts against the outer wall of the first arm segment 2, and the abutting parts 12 on both sides of the deformable part 11 abut against the inner wall of the second arm segment 3. During the axial extension and retraction movement of the first arm segment 2 relative to the second arm segment 3, when the gap 7 between the first arm segment 2 and the second arm segment 3 gradually increases or decreases or suddenly increases or decreases, the deformable part 11 is subjected to the squeezing force from the first arm segment 2. The deformable part 11 undergoes elastic deformation, so that the height H of the elastic element 1 is also adjusted accordingly to cope with the change of the gap 7.

[0041] like Figures 1-8 As shown, in this embodiment, the elastic element 1 is disposed at the tail end of the first arm segment 2 and the second arm segment 3. The deformable part 11 abuts against the inner wall of the second arm segment 3, and the abutting parts 12 on both sides of the deformable part 11 abut against the outer wall of the first arm segment 2. The height H of the elastic element 1 is the distance from the deformable part 11 to the abutting part 12. During the axial extension and retraction movement of the first arm segment 2 relative to the second arm segment 3, the gap 7 between the first arm segment 2 and the second arm segment 3 suddenly decreases due to the protrusion 31 on the inner wall of the second arm segment 3. When the elastic element 1 moves to the protrusion 31 with the movement of the first arm segment 2, the deformable part 11 is subjected to radial extrusion force from the inner wall of the second arm segment 3 and axial extrusion force from the protrusion 31. In order to maintain abutment against the outer wall of the first arm segment 2, the deformable part 11 undergoes elastic deformation, which reduces the height H of the elastic element 1, thus avoiding wear between the arm segments.

[0042] In one embodiment, the deformable portion 11 includes a first deformable portion 111 and a second deformable portion 112 respectively disposed on both sides of the first deformable portion 111. The longitudinal section of the first deformable portion 111 has an arc-shaped profile, and the longitudinal section of the second deformable portion 112 has a straight profile. One end of the second deformable portion 112 is connected to the first deformable portion 111, and the other end is connected to the abutment portion 12. The first deformable portion 111 abuts against one of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3.

[0043] like Figure 2 , Figure 4 , Figure 6 , Figure 8As shown, in this embodiment, the first deformation part 111 abuts against the inner wall of the second arm section 3, and the abutting part 12 abuts against the outer wall of the first arm section 2. The first deformation part 111 is used to withstand the radial extrusion force from the inner wall of the second arm section 3. The profile of the longitudinal section of the first deformation part 111 is arc-shaped. The region of this longitudinal section shape structure can better convert the extrusion force into elastic potential energy and improve local stability.

[0044] The second deformation portions 112 on both sides of the first deformation portion 111 can be directly connected to the first deformation portion 111 or tangentially connected to the first deformation portion 111. The second deformation portion 112 can not only withstand the axial compressive force from the protrusion 31, but also withstand the local compressive force transmitted from the first deformation portion 111. The longitudinal section of the second deformation portion 112 has a straight profile. The area of ​​this longitudinal section shape structure can undergo elastic deformation under the axial compressive force from the protrusion 31 to cooperate with the first deformation portion 111 so that the height H of the elastic member 1 becomes smaller, and at the same time improves the stress distribution uniformity of the longitudinal section of the elastic member 1.

[0045] In one embodiment, the second deformation portions 112 on both sides of the first deformation portion 111 are tangentially connected to the first deformation portion 111, thereby achieving a smooth transition, avoiding stress concentration, and improving local stability.

[0046] In one embodiment, the distance between the lines connecting the abutting portions 12 on both sides of the deformable portion 11 is L. The second deformable portions 112 on both sides of the first deformable portion 111 are at the same height as the two contact points connected to the first deformable portion 111, and the perpendicular bisector M of the line connecting the two contact points intersects between 1 / 5L and 4 / 5L of the line connecting the abutting portions 12 on both sides.

[0047] like Figure 2 , Figure 4 , Figure 6 , Figure 8 , Figure 10 , Figure 12 As shown, in this embodiment, the distance between the lines connecting the inner sides of the two abutting parts 12 is L. The two second deformable parts 112 are at the same height as the two contact points connected to the first deformable part 111, and the perpendicular bisector M of the line connecting the two contact points intersects between 1 / 5L and 4 / 5L of the line connecting the two abutting parts 12.

[0048] In one embodiment, the curvature center A of the arcuate profile of the longitudinal section of the first deformed portion 111 lies on the perpendicular bisector M.

[0049] like Figure 2 , Figure 4 , Figure 6 , Figure 8 , Figure 10 , Figure 12As shown, in this embodiment, the curvature center A of the arc-shaped profile of the longitudinal section of the first deformable part 111 is on the perpendicular bisector M. This structural arrangement can ensure the uniformity of the overall stress of the longitudinal section of the first deformable part 111.

[0050] In one embodiment, the robotic arm assembly further includes a first fixing member 5, wherein one of the abutment portions 12 is fixedly connected to one of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3 via the first fixing member 5.

[0051] like Figures 1-4 As shown, in this embodiment, one of the abutting parts 12 on both sides of the deformable part 11 is fixedly connected to the outer wall of the first arm section 2 through the first fixing member 5, and the other abutting part 12 abuts against the outer wall of the first arm section 2, so that the elastic member 1 can move together with the first arm section 2 to avoid detachment and failure during movement, which would lead to wear between the arm sections.

[0052] In one embodiment, the first fastener 5 is one of a bolt, a rivet, or a rivet post.

[0053] In one embodiment, the robotic arm assembly further includes a first limiting groove 21, which is disposed on one of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3. The abutment portion 12 is located in the first limiting groove 21 and can slide within the first limiting groove 21.

[0054] like Figures 5-8 As shown, in this embodiment, the deformable part 11 abuts against the inner wall of the second arm segment 3, and the first limiting groove 21 is provided on the outer wall of the first arm segment 2. The abutting parts 12 on both sides of the deformable part 11 are located in the first limiting groove 21 and can slide within the first limiting groove 21. The deformable part 11 undergoes elastic deformation due to the axial and radial pressure from the second arm segment 3, while the abutting parts 12 slide within the first limiting groove 21 due to the pressure transmitted from the deformable part 11, causing the height H of the elastic member 1 to change accordingly.

[0055] In one embodiment, the robotic arm assembly further includes a support base 4, a deformable portion 11 abutting against one of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3, an abutting portion 12 abutting against the support base 4, and the support base 4 being fixed to the other of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3.

[0056] like Figures 9-14As shown, in this embodiment, the elastic element 1 is disposed at the tail end of the first arm segment 2 and the second arm segment 3. The deformable part 11 abuts against the inner wall of the second arm segment 3, and the abutting parts 12 on both sides of the deformable part 11 abut against the side of the support seat 4 near the inner wall of the second arm segment 3. The support seat 4 is fixed on the outer wall of the tail end of the first arm segment 2. The height H of the elastic element 1 is the distance from the deformable part 11 to the abutting part 12. During the axial extension and retraction movement of the first arm segment 2 relative to the second arm segment 3, the gap 7 between the first arm segment 2 and the second arm segment 3 gradually decreases. When the elastic element 1 moves with the first arm segment 2, the deformable part 11 is subjected to radial extrusion force from the inner wall of the second arm segment 3. In order to maintain abutment against the outer wall of the first arm segment 2, the deformable part 11 undergoes elastic deformation, causing the height H of the elastic element 1 to gradually decrease, thereby avoiding wear between the arm segments.

[0057] In one embodiment, the support base 4 can be fixedly connected to one of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3 by one of the following methods: welding, riveting, bonding, or threaded connection. Figures 13-14 As shown, in this embodiment, the support base 4 is welded to the outer wall of the first arm section 2.

[0058] In one embodiment, the support base 4 includes a support base body 41 and a second limiting groove 42. The second limiting groove 42 is disposed on the support base body 41, and the abutment part 12 is located in the second limiting groove 42 and can slide in the second limiting groove 42. The robotic arm assembly also includes a second fixing member 6. The support base body 41 is fixedly connected to one of the outer wall of the first arm segment 2 and the inner wall of the second arm segment 3 through the second fixing member 6.

[0059] like Figures 9-12 As shown, the support body 41 is fixedly connected to the outer wall of the first arm section 2 through the second fixing member 6, and the abutment parts 12 on both sides of the deformable part 11 are located in the second limiting groove 42 and can slide in the second limiting groove 42.

[0060] In one embodiment, the second fastener 6 is at least one of a bolt, a rivet, or a rivet post.

[0061] The robotic arm components provided in this application can be used in cranes, log grabbers, forklift cranes, crawler cranes, aerial work platforms, special vehicles, etc., without any restrictions.

[0062] Another embodiment of this application provides a construction machine, including a chassis and a robotic arm assembly provided in the foregoing embodiments, the robotic arm assembly being located on the chassis. Such construction machinery improves the mechanical performance and service life of the construction machinery and avoids the occurrence of safety accidents.

[0063] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A robotic arm assembly, characterized in that, include: The first arm segment (2), the second arm segment (3), and the elastic element (1) disposed between the first arm segment (2) and the second arm segment (3). The first arm segment (2) is sleeved inside the second arm segment (3). There is a gap (7) between the first arm segment (2) and the second arm segment (3). The elastic element (1) abuts against the outer wall of the first arm segment (2) and the inner wall of the second arm segment (3) respectively. During the axial extension and retraction movement of the first arm segment (2) relative to the second arm segment (3), the elastic element (1) can maintain abutting against the outer wall of the first arm segment (2) and the inner wall of the second arm segment (3) respectively by elastic deformation when the gap (7) at the position of the elastic element (1) changes.

2. The mechanical arm assembly of claim 1, wherein, The elastic element (1) includes a deformable part (11) and abutting parts (12) connected to both sides of the deformable part (11). The deformable part (11) abuts against one of the outer wall of the first arm segment (2) and the inner wall of the second arm segment (3). The abutting part (12) abuts against the other of the outer wall of the first arm segment (2) and the inner wall of the second arm segment (3). During the axial extension and retraction movement of the first arm segment (2) relative to the second arm segment (3), the deformable part (11) can maintain abutment against one of the outer wall of the first arm segment (2) and the inner wall of the second arm segment (3) by elastic deformation when the gap (7) at the position of the elastic element (1) changes.

3. The mechanical arm assembly of claim 2, wherein, The deformable part (11) includes a first deformable part (111) and a second deformable part (112) respectively disposed on both sides of the first deformable part (111). The longitudinal section of the first deformable part (111) has an arc shape, and the longitudinal section of the second deformable part (112) has a straight line shape. One end of the second deformable part (112) is connected to the first deformable part (111), and the other end is connected to the abutting part (12). The first deformable part (111) abuts against one of the outer wall of the first arm segment (2) and the inner wall of the second arm segment (3).

4. The mechanical arm assembly of claim 3, wherein, The distance between the lines connecting the abutting portions (12) on both sides of the deformable portion (11) is L. The second deformable portions (112) on both sides of the first deformable portion (111) are at the same height as the two contact points connected to the first deformable portion (111), and the perpendicular bisector (M) of the line connecting the two contact points intersects between 1 / 5L and 4 / 5L of the line connecting the abutting portions (12) on both sides.

5. The mechanical arm assembly of claim 4, wherein, The curvature center (A) of the arc-shaped profile of the longitudinal section of the first deformed part (111) is on the perpendicular bisector (M).

6. The mechanical arm assembly of claim 2, wherein, The robotic arm assembly also includes a first fixing member (5), one of the abutting portions (12) being fixedly connected to one of the outer wall of the first arm segment (2) and the inner wall of the second arm segment (3) via the first fixing member (5).

7. The mechanical arm assembly of claim 2, wherein, The mechanical arm assembly further comprises a first limiting groove (21) arranged on one of the outer wall of the first arm section (2) and the inner wall of the second arm section (3), and the abutting portion (12) is located in and can slide in the first limiting groove (21).

8. The mechanical arm assembly of claim 2, wherein, The mechanical arm assembly further comprises a support seat (4), the deformation portion (11) abuts with one of the outer wall of the first arm section (2) and the inner wall of the second arm section (3), the abutting portion (12) abuts with the support seat (4), and the support seat (4) is fixed on the other one of the outer wall of the first arm section (2) and the inner wall of the second arm section (3).

9. The mechanical arm assembly of claim 8, wherein, The support seat (4) comprises a support seat body (41) and a second limiting groove (42), the second limiting groove (42) is arranged on the support seat body (41), the abutting portion (12) is located in and can slide in the second limiting groove (42), and the mechanical arm assembly further comprises a second fixing member (6), and the support seat body (41) is fixedly connected with one of the outer wall of the first arm section (2) and the inner wall of the second arm section (3) through the second fixing member (6).

10. A construction machine characterized by comprising: The mechanical arm assembly comprises a chassis and a mechanical arm assembly as claimed in any one of claims 1 to 9, and the mechanical arm assembly is located on the chassis.

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