CN114195023A

CN114195023A - Arm support, overhead working truck and arm support manufacturing method

Info

Publication number: CN114195023A
Application number: CN202111538986.4A
Authority: CN
Inventors: 刘其跃; 马洪锋; 颜婷
Original assignee: Jiangsu Xugong Construction Machinery Research Institute Co ltd
Current assignee: Jiangsu Xugong Construction Machinery Research Institute Co ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-03-18

Abstract

The invention discloses an arm support, an overhead working truck and an arm support manufacturing method, relates to the field of engineering machinery, and aims to improve the structure of the arm support and improve the bearing capacity of the arm support. The arm support comprises at least two nested arm sections. At least one arm segment includes a first cover plate and a second cover plate. The first cover plate is constructed integrally and comprises a first side plate, a top plate and a second side plate which are arranged in sequence; the first and second side plates are oppositely arranged, and the free ends of the first and second side plates far away from the top plate are both convex or concave. The second cover plate is constructed as a whole and comprises a third side plate, a bottom plate and a fourth side plate which are sequentially arranged; the third and fourth side plates are arranged oppositely, and the free ends of the third and fourth side plates far away from the bottom plate are convex or concave. The free end fixed connection of first curb plate and third curb plate, the free end fixed connection of second curb plate and fourth curb plate to make first apron and second apron enclose into confined profile.

Description

Arm support, overhead working truck and arm support manufacturing method

Technical Field

The invention relates to the field of engineering machinery, in particular to an arm support, an overhead working truck and an arm support manufacturing method.

Background

The high-altitude operation vehicle is widely applied to the fields of buildings, municipal maintenance, fire fighting and the like. The blue-plate overhead working truck refers to an overhead working truck which can adopt a license plate of a household car. The blue-brand overhead working truck has the advantages of no restriction on urban traffic, simple operation and the like, but the quality and the size of the whole truck are strictly limited by national standards, so that the blue-brand overhead working truck is difficult to adapt to the structure and parameters of the conventional engineering overhead working truck. In recent years, as the number of high-altitude car products gradually increases toward rice, the requirement for light weight also increases.

The section of the box type single-section telescopic arm section equipped for the current high-altitude operation vehicle is mostly quadrangle, pentagon, hexagon, U-shaped and the like.

The inventor finds that at least the following problems exist in the prior art: the conventional sections such as quadrangle, pentagon, hexagon and U-shaped have unreasonable design, and are easy to generate local crushing and buckling damage.

Disclosure of Invention

The invention provides an arm support, an overhead working truck and an arm support manufacturing method, which are used for improving the structure of the arm support and improving the bearing capacity of the arm support.

The embodiment of the invention provides an arm support, which comprises at least two nested arm sections, wherein at least one arm section comprises:

a first cover plate configured to be unitary, the first cover plate including a first side plate, a top plate, and a second side plate arranged in series; the first side plate and the second side plate are oppositely arranged, the free end of the first side plate far away from the top plate is configured to be convex or concave, and the free end of the second side plate far away from the top plate is also configured to be convex or concave; and

a second cover plate configured to be integral, the second cover plate including a third side plate, a bottom plate, and a fourth side plate arranged in this order; the third side plate and the fourth side plate are arranged oppositely, the free end of the third side plate far away from the bottom plate is convex or concave, and the free end of the fourth side plate far away from the bottom plate is also convex or concave;

the free end of the first side plate is fixedly connected with the free end of the third side plate, and the free end of the second side plate is fixedly connected with the free end of the fourth side plate, so that the first cover plate and the second cover plate enclose a closed contour.

In some embodiments, the free end of the first side panel is configured to be concave, the free end of the third side panel is configured to be concave, and the free end of the first side panel and the free end of the third side panel are pieced together to form a first concave portion;

the free end of the second side plate is configured to be concave, the free end of the fourth side plate is configured to be concave, and the free end of the second side plate and the free end of the fourth side plate are spliced to form a second inner concave part.

In some embodiments, the first and second interior recesses are equal in height and each range from 30mm to 55 mm.

In some embodiments, the free end of the first side panel is configured to be convex, the free end of the third side panel is configured to be convex, and the free end of the first side panel and the free end of the third side panel are brought together to form a first boss;

the free end of the second side plate is configured to be convex, the free end of the fourth side plate is configured to be convex, and the free end of the second side plate and the free end of the fourth side plate are spliced to form a second convex part.

In some embodiments, the first and second protrusions have equal heights and are each 30mm to 55 mm.

In some embodiments, the wall thickness of the first cover plate is 2mm and the wall thickness of the second cover plate is 2mm or 3 mm.

In some embodiments, the base plate comprises:

a flat plate parallel to the top plate;

a first bending plate configured to be bent, the first bending plate being located at one side of the flat plate in a length direction, and an included angle θ between the first bending plate and the flat plate; the first bending plate is fixedly connected with the first side plate; and

a second bending plate configured to be bent, the second bending plate being located at the other side of the flat plate in the length direction, and the second bending plate also having an angle θ with the flat plate; the second bending plate is fixedly connected with the second side plate;

wherein θ is greater than 90 ° and less than 180 °.

In some embodiments, θ is between 150 ° and 170 °.

In some embodiments, in the width direction of the arm segments, the total width of the arm segments is w1, and the width of the flat plate is w 2;

wherein the lower limit value of w2 is: 0.158 × w1+ 29.2;

the upper limit value of w2 is: 0.194 × w1+ 35.6.

In some embodiments, the total width of the arm segments in the width direction of the arm segments is w1, and the height of the arm segments is h 1;

wherein, the lower limit value of h1 is: 1.64 xw 1-87.4;

the upper limit value of h1 is: 2.01 xw 1-107.

In some embodiments, the two nested arm segments are a first arm segment and a second arm segment; the first arm section is nested on the inner side of the second arm section; the arm section further includes:

the first sliding block assembly is arranged on the first arm section; the first slide block assembly comprises a first slide block positioned at the top of the outer side of the first arm section;

when the first arm section does not extend relative to the second arm section, a first gap delta 1 exists between the first sliding block and the inner wall of the second arm section; when the arm support bears the load, and when the first arm section completely extends out relative to the second arm section, the first sliding block is completely attached to the inner wall of the second arm section.

In some embodiments, in the width direction of the arm section, the total width of the arm section is w1, and the lower limit of the first gap δ 1 is: 0.0168 xw 1-2.64; the upper limit of the first gap δ 1 is: 0.0336 xw 1-5.28.

In some embodiments, the first slider includes:

a first gap part fixed to an outer side of the top plate of the first cover plate; when the first arm section does not extend relative to the second arm section, a first gap delta 1 exists between the first gap part and the inner wall of the second arm section; when the arm support bears the load, and when the first arm section completely extends out relative to the second arm section, the first gap part is completely attached to the inner wall of the second arm section; and

the first fit part is fixedly connected with the first gap part or is integrated with the first gap part; the first attaching portion is fixed to the outer side of the first side plate or the outer side of the second side plate of the first cover plate.

In some embodiments, a surface of the first gap portion facing the second arm section is configured as a convex arc.

In some embodiments, the first slider assembly further comprises:

the second sliding block is fixed on the outer side of the flat plate of the first arm section; the second sliding block is matched with the first clearance part so as to limit the first arm section in the height direction of the arm support; and

the number of the third sliding blocks is two; one of the third sliding blocks is fixed at the bent part of the first bending plate, and the other third sliding block is fixed at the bent part of the second bending plate; the two third sliding blocks are matched with each other so as to limit the first arm section in the height direction and the width direction of the arm support.

In some embodiments, the number of the first sliding blocks is two, one of the first sliding blocks is fixed at the joint of the first side plate and the top plate, and the other first sliding block is fixed at the joint of the second side plate and the top plate.

In some embodiments, the arm segment further comprises:

the second sliding block assembly is arranged on the second arm section; the second sliding block assembly comprises a fourth sliding block positioned at the bottom of the inner wall of the second arm section;

when the first arm section does not extend relative to the second arm section, a second gap exists between the fourth sliding block and the outer wall of the first arm section; when the arm support bears the load, and when the first arm section completely extends out relative to the second arm section, the fourth sliding block is completely attached to the outer wall of the first arm section.

In some embodiments, the lower limit of the second gap δ 2 is

The upper limit of the second gap is

Wherein the total width of the bottom plate is w1, and the width of the flat plate is w 2.

In some embodiments, the second slider assembly further comprises:

the number of the fifth sliding blocks is two, one of the fifth sliding blocks is arranged at the bending position of the first bending plate, and the other of the fifth sliding blocks is arranged at the bending position of the second bending plate; when the first arm section does not extend relative to the second arm section, a third gap delta 3 exists between the fifth sliding block and the outer wall of the first arm section; when the arm support bears the load, and when the first arm section completely extends out relative to the second arm section, the fifth sliding block is completely attached to the outer wall of the first arm section.

In some embodiments, the lower limit of the third gap δ 3 is

The upper limit of the third gap δ 3 is

In some embodiments, the fifth slider includes:

the second gap part is fixed on the inner wall of the bottom plate of the second arm section; wherein, when the first arm section does not extend relative to the second arm section, the second gap portion has a third gap δ 3 with the outer wall of the first arm section; when the arm support bears the load, and when the first arm section completely extends out relative to the second arm section, the second gap part is completely attached to the outer wall of the first arm section; and

and the second attaching part is fixedly connected with or integrated with the second gap part and is fixed on the inner wall of the third side plate or the fourth side plate of the second arm section.

In some embodiments, the two fifth sliding blocks are matched with each other to limit the first arm section in the width direction and the height direction of the arm support.

In some embodiments, the second slider assembly further comprises:

the number of the sixth sliding blocks is two, one of the sixth sliding blocks is fixed at the joint of the top plate of the first cover plate of the second arm section and the first side plate, and the other one of the sixth sliding blocks is fixed at the joint of the top plate of the first cover plate of the second arm section and the second side plate; the two sixth sliding blocks are matched with the fourth sliding blocks so as to limit the first arm section in the width direction and the height direction of the arm support.

In some embodiments, the second slider assembly is located downstream of the first slider assembly in the direction of extension of the first arm segment.

The embodiment of the invention also provides an overhead working truck which comprises the arm support provided by any technical scheme of the invention.

The embodiment of the invention also provides a method for manufacturing the arm support, which comprises the following steps:

bending the steel plate to form a first cover plate;

bending the steel plate to form a second cover plate;

welding the first cover plate and the second cover plate to form an arm section;

and nesting the multiple sections of arm sections to form the arm support.

In some embodiments, nesting the multi-link arm links specifically comprises the following steps:

a first sliding block component is arranged at the tail end of the first arm section;

nesting the first arm section and the second arm section;

and a second sliding block component is arranged at the head end of the second arm section.

According to the arm support provided by the technical scheme, the first cover plate and the second cover plate are welded to form the arm sections, the cross sections of the arm sections are provided with the concave parts and the convex parts for enhancing the strength, the bending resistance and the compression resistance of the arm sections, the bearing capacity of the arm support is obviously improved, meanwhile, the rigidity of the arm sections is improved to a certain degree, and therefore the performance of the arm support is effectively improved; in addition, the side surface of the arm section is bent and welded to form a concave (or convex) compression type, so that the side plate of the arm support is effectively prevented from local buckling instability when the arm support is loaded, the safety of the arm support structure is improved, and the arm support can be developed towards a thinner and longer direction; the design of the arm section structure of the ultra-thin type is beneficial to improving the lightweight level of the arm section and reducing the weight of the arm section corresponding to the unit length, so that the arm section is longer, the highest operation range of the blue-brand overhead working truck exceeds the level of the existing industry, and the requirements of both lightweight and higher operation height are met.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic structural view of an arm support of an aerial platform provided in some embodiments of the present invention.

Fig. 2 is a partial three-dimensional structural diagram of an arm support according to some embodiments of the present invention.

Fig. 3 is a partial front view structural diagram of an arm support according to some embodiments of the present invention.

Fig. 4 is a schematic front view of an exploded structure of a first arm section and a second arm section of an arm support according to some embodiments of the present invention.

Fig. 5 is a schematic structural diagram of an arm section of an arm rest according to some embodiments of the present invention.

Fig. 6 is a schematic perspective view of a first arm section and a first slider assembly of an arm support according to some embodiments of the present invention.

Fig. 7 is a schematic front view of a first arm section and a first slider assembly of an arm support according to some embodiments of the present invention.

Fig. 8 is a schematic gap diagram of a first slider assembly and a second arm section of a first arm section of an arm support according to some embodiments of the present invention.

Fig. 9 is a schematic perspective view of a second arm section and a second slider assembly of an arm support according to some embodiments of the present invention.

Fig. 10 is a schematic front view of a second arm section and a second slider assembly of an arm support according to some embodiments of the present invention.

Fig. 11 is a schematic gap diagram of a second slider assembly of a second arm section of an arm support and a first arm section according to some embodiments of the present invention.

Fig. 12 is a schematic view of a retracted state of a boom according to some embodiments of the present invention.

Fig. 13 is a schematic view of an extended deformation of an arm support according to some embodiments of the present invention.

Fig. 14 is a schematic cross-sectional view of an arm support according to other embodiments of the present invention.

Fig. 15 is a schematic flow chart of a manufacturing method of an arm support according to some embodiments of the present invention.

Reference numerals:

1. a first arm section; 2. a second arm section; 3. a first cover plate; 4. a second cover plate; 5. a first concave portion; 6. a second concave portion; 7. a first slider assembly; 8. a second slider assembly; 9. a first boss portion; 10. a second boss portion;

31. a first side plate; 32. a top plate; 33. a second side plate;

41. a third side plate; 42. a base plate; 43. a fourth side plate;

421. a flat plate; 422. a first bending plate; 423. a second bending plate;

71. a first slider; 72. a second slider; 73. a third slider;

711. a first gap portion; 712. a first bonding portion;

81. a fourth slider; 82. a fifth slider; 83. a sixth slider;

821. a second gap portion; 822. a second bonding portion.

Detailed Description

The technical solution provided by the present invention will be explained in more detail with reference to fig. 1 to 15.

Referring to fig. 1, some embodiments of the present invention further provide an aerial work platform, including the arm support provided in any technical scheme of the present invention.

The number of arm sections included in the arm support is 4 sections, 5 sections, 6 sections or even 7 sections. The arm sections are nested to form the telescopic arm support. In fig. 1, a schematic diagram of the extending state of three arm sections of the arm support is shown. The ab region is illustrated in fig. 1. In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following mainly explains the ab region in detail.

Referring to fig. 2-13, some embodiments of the present invention provide an arm support, particularly suitable for a blue-brand aerial lift truck. The blue-plate overhead working truck is one of overhead working trucks, and adopts a blue plate as a domestic car, so that when traffic passes in a city, the requirements on drivers are the same as those of the domestic car, and the requirements on the size and the weight of the vehicle are also the same as those of the domestic car. Therefore, the weight and the size of the blue-brand aerial work vehicle are different from those of the traditional aerial work vehicle for engineering. When the vehicle runs on a road, the upper limits of the weight and the size of the blue-brand overhead working truck are far lower than those of the traditional overhead working truck for engineering.

Under the restriction of such strict national standards, it is still a continuous pursuit of the industry to improve the working height of the blue-brand overhead working truck. The structure of the arm support directly influences the operation height. The prior arm support of the blue-brand aerial work vehicle adopts an arm support with a cross section in a quadrilateral shape, a pentagonal shape, a hexagonal shape, a U-shaped shape and the like. When the boom with the structures reaches the current limit working height of 23m, the structure of the boom cannot bear the total weight of the boom and the working equipment lifted by the boom, and local crushing and buckling damage are easy to occur, so that danger is caused.

In order to improve the strength of the arm support, improve the structure of the arm support and improve the operation height of the arm support, the inventor of the application provides the following solutions through creative labor.

Referring to fig. 1-3, the arm support includes at least two nested arm sections. In some embodiments, the arm support comprises a four-section arm, a five-section arm, a six-section arm or a seven-section arm, and the total lifting height of the blue brand high-altitude operation vehicle is not lower than 25 m. Each arm section can adopt the structure of the arm section introduced below, and compared with the maximum lifting height in the prior art, the lifting height is improved by about 10% on the premise that the overall structure of the arm support is firmer and is not damaged by local crushing and buckling. The implementation of the boom is described in detail below.

Referring to fig. 1, the arm support comprises at least two nested arm sections, and at least one arm section adopts the structure described below. In some embodiments, the arm section structure described below is used for both the inner and outer nested arm sections.

Referring to fig. 1, for the sake of clarity, two nested arm sections are denoted as a first arm section 1 and a second arm section 2; wherein, first arm festival 1 is the inner arm, and second arm festival 2 is outer arm, and first arm festival 1 nests in second arm festival 2. The first arm segment 1 and the second arm segment 2 are both arm segments including a first cover plate 3 and a second cover plate 4 described later. The specific implementation of the arm segments is described in detail below.

Referring to fig. 1, an XYZ coordinate system is established in fig. 1, an X axis represents a length direction of the boom, a Y axis represents a width direction of the boom, and a Z axis represents a height direction of the boom. The positive direction of the X axis is the extending direction of the first arm section 1, and one end of each arm section corresponding to the maximum coordinate value of the X axis is a head; the negative direction of the X axis is the retraction direction of the first arm section 1, and one end of each arm section corresponding to the minimum coordinate value of the X axis is a tail part. The length, width and height directions of each arm section included in the arm support are the same as those of the arm support.

Referring to fig. 1 to 4, the arm section includes a first cover plate 3 and a second cover plate 4. The first cover 3 is constructed as a single body, and the first cover 3 includes a first side plate 31, a top plate 32, and a second side plate 33 arranged in this order. The first side plate 31 and the second side plate 33 are arranged opposite to each other, the free end of the first side plate 31 remote from the top plate 32 being convex or concave, and the free end of the second side plate 33 remote from the top plate 32 also being convex or concave. The concave part is a concave part towards the center point of the arm support in the width direction and the height direction, and the convex part is a convex part relative to the center point of the arm support in the width direction and the height direction.

Referring to fig. 4, in some embodiments, there is a radius between the first side panel 31 and the top panel 32, and a radius between the top panel 32 and the second side panel 33. The height of the first cover plate 3 is greater than the height of the second cover plate 4 in the height direction of the arm sections. Therefore, on the premise of ensuring the bearing capacity of the arm sections, the weight of the arm sections in unit length is reduced to the maximum extent, and the light weight of the arm sections and the arm support is realized.

Referring to fig. 4 and 5, the second cover plate 4 is constructed as a single body, and the second cover plate 4 includes a third side plate 41, a bottom plate 42, and a fourth side plate 43, which are sequentially arranged. The third side plate 41 and the fourth side plate 43 are arranged opposite to each other, the free end of the third side plate 41 facing away from the base plate 42 being convex or concave, and the free end of the fourth side plate 43 facing away from the base plate 42 also being convex or concave. Wherein the free end of the first side plate 31 and the free end of the third side plate 41 are fixedly connected, and the free end of the second side plate 33 and the free end of the fourth side plate 43 are fixedly connected, so that the first cover plate 3 and the second cover plate 4 enclose a closed contour.

According to the technical scheme, the first cover plate 3 and the second cover plate 4 are integrated, so that no welding seam exists between the first cover plate 3 and the second cover plate 4, and the defects caused by welding are reduced; in addition, the first cover plate 3 and the second cover plate 4 are provided with concave parts and convex parts for reinforcing the structural strength of the wall body at the welding positions, so that the bearing capacity and the buckling failure limit of the arm support are greatly improved.

Referring to fig. 4 and 5, in some embodiments, bottom plate 42 includes a flat plate 421, a first bent plate 422, and a second bent plate 423. The plate 421 is parallel to the top plate 32. The first bending plate 422 is configured to be bent, the first bending plate is located at one side of the flat plate 421 in the length direction, and the first bending plate 422 and the flat plate 421 form an angle θ. The first bending plate 422 is fixedly connected to the first side plate 31. The second bending plate 423 is bent, and the second bending plate is located at the other side of the flat plate 421 in the length direction, and the angle between the second bending plate 423 and the flat plate 421 is also θ. The second bending plate 423 is fixedly connected to the second side plate 33. Wherein θ is greater than 90 ° and less than 180 °.

In the above technical solution, the bottom plate 42 of the second cover plate 4 is bent into a three-section shape according to a specific angle and length ratio, and the bottom plate 42 adopts the structure bent toward the first cover plate 3, which is beneficial to increasing the compression resistance and bending resistance of the arm section.

Referring to fig. 4 and 5, in some embodiments, θ is between 150 ° and 170 °, specifically, such as 150 °, 155 °, 160 °, 165 °, and 170 °.

Referring to fig. 4, the first cover plate 3 and the second cover plate 4 are symmetrical with respect to the center line L of the arm section in the width direction, and the arm section has a symmetrical structure, so that symmetrical loads can be better borne.

A broken line S in fig. 4 is a boundary line of the first cover plate 3 and the fourth cover plate 4. The upper half in fig. 4 is the first cover plate 3. As can be seen from fig. 4, the first cover plate 3 is substantially U-shaped in cross section. The U-shaped free end of the first cover plate 3 is designed to be concave. The lower half in fig. 4 is a second cover plate 4. As can be seen from fig. 4, the second cover plate 4 is substantially U-shaped in cross section, but the bottom of the U-shape is bent. The U-shaped free end of the second cover plate 4 is designed to be concave.

With continued reference to fig. 4, in particular, in some embodiments, the free end of the first side panel 31 is configured to be concave, the free end of the third side panel 41 is configured to be concave, and the free end of the first side panel 31 and the free end of the third side panel 41 are pieced together to form the first internal recess 5. The free end of the second side plate 33 is configured to be concave, the free end of the fourth side plate 43 is configured to be concave, and the free end of the second side plate 33 and the free end of the fourth side plate 43 are pieced together to form the second concave portion 6. According to the technical scheme, the cross section shape of the arm section is optimized through the specially designed structures of the first cover plate 3 and the second cover plate 4, and the bearing capacity and the buckling failure limit of the arm support are improved.

With continued reference to fig. 4, in some embodiments, the arm segments have an overall height h1 and an overall width w 1. h1 and w1 are each in millimeters (mm), and h1 and w1 satisfy the following functional relationships: the lower limit of h1 is: 1.64 xw 1-87.4. The upper limit of h1 is: 2.01 xw 1-107. In the above functional relationship, constants 87.4 and 107 are in millimeters.

The total height h1 and the total width w1 of the arm segments. By adopting the parameter range, the bearing capacity and the buckling failure limit of the arm support are improved. h1 and w1, as the total height and width of the arm segment, directly affect the weight (weight of the arm segment per unit length) and stiffness of the arm segment. The technical scheme provides a functional relation between h1 and w1, and the sizes of h1 and w1 which meet the functional relation are combined to enable the rigidity of the arm section to be optimal. On the premise of ensuring that the weight of the arm section is not changed (the section of the arm section is approximately regarded as a rectangle, namely the sum of h1+ h1+ w1+ w1 is not changed), if h1 is increased and w1 is reduced, the horizontal rigidity of the arm section is reduced, and the left-right swinging amplitude is increased when lateral wind load occurs, so that the operation is influenced; if w1 is increased and h1 is decreased, the vertical rigidity of the arm joint is reduced, and the downward deflection of the arm joint is increased under the action of self weight and end load, so that the actual operation range is reduced, and the normal operation of the telescopic mechanisms such as the oil cylinder and the steel wire rope is influenced.

With continued reference to fig. 4, in some embodiments, the first and

second fillet

5, 6 have a height h2 that is equal and each is between 30mm and 55mm, such as 30mm, 35mm, 40mm, 45mm, 50mm, 55 mm. The first and second

concave portions

5 and 6 have the same configuration, and the height h2 of the first concave portion 5 is the distance in the Z direction corresponding to the lowest point of the bottom of the first concave portion 5, i.e., the distance between points AB in fig. 4. The size of the recessed area of 30-55 mm is moderate, and taking the first concave part 5 as an example, the welding deformation of the first side plate 31 and the third side plate 41 can be controlled, the processing quality is improved, the whole side surface formed by the first side plate 31 and the third side plate 41 can be prevented from generating local instability too early when the arm section is subjected to load bending, and the buckling stability of the arm section is improved.

With continued reference to fig. 4, in some embodiments, in the width direction of the arm section, since the thickness of the second cover plate 4 is greater than that of the first cover plate 3, and the two are welded and fixed, the total width w1 of the arm section is the same as that of the bottom plate 42, and the width of the flat plate 421 is w 2. Wherein the lower limit value of w2 is: 0.158 Xw 1+ 29.2. The upper limit value of w2 is: 0.194 × w1+ 35.6. The unit of w2 is millimeter, mm. The constants 29.2 and 35.6 are in millimeters. When the total height h1 and the total width w1 of the arm segment are determined, w2 and θ together determine the specific shape of the flat plate 421, the first bending plate 422 and the second bending plate 423, which can significantly improve the bending deformation resistance of the base plate 42 in the extending direction of the arm segment, which is particularly shown in the section a-a in fig. 13. When the bottom plate 42 is extruded by the fourth sliding block 81 and the fifth sliding block 82 which are described later, the local crushing phenomenon cannot occur too early, so that the ultimate bearing capacity of the whole arm support structure is improved, and compared with the product with the operation height of 23m in the prior art, the ultimate bearing capacity is improved by 25%.

As can be seen from fig. 4, when the arm support is extended horizontally, the first cover plate 3 is located at the top, and the second cover plate 4 is located at the bottom. The cross section of the arm section is a closed contour. At the welding of the first cover plate 3 and the second cover plate 4, a first concave recess 5 and a second concave recess 6 are formed. The first cover plate 3 and the second cover plate 4 are respectively formed by bending a whole plate, and the wall thicknesses of the first cover plate 3 and the second cover plate 4 are the same and different. The wall thickness of the first cover plate 3 is smaller than or equal to the wall thickness of the second cover plate 4. In some embodiments, the wall thickness of the first cover plate 3 is 2mm and the wall thickness of the second cover plate 4 is 2mm or 3 mm.

The arm support comprises a plurality of arm sections, each arm section can be made of a 2mm steel plate, or the arm sections are formed by splicing 2mm steel plates and 3mm steel plates. According to the specific vehicle type, the second cover plate 4 of one section of arm or two sections of arm of the arm support can be replaced by an ultrathin steel plate with the thickness of 3mm during design, and the rest second cover plates 4 are made of ultrathin steel plates with the thickness of 2mm, so that the structural safety is further guaranteed. The second cover plate 4 can also be made of a plate with the thickness of 2 mm-3 mm.

The weight of the whole blue-plate overhead working truck is required to be less than 4500 kg. According to the existing market technology, the weight of accessories such as a cab, a frame, a supporting leg and the like is reduced to a minimum, and the weight space reserved for the arm support is about 800 kg. If the arm support adopts 3mm and 4mm steel plates, the maximum total operation height of 23m can be reached; if the steel plates with the diameters of 2mm and 3mm are adopted, the mass of the arm support can be reduced to 600kg under the same operation height (namely, the length of each arm section is unchanged), the saved 200kg is used for increasing the length of each arm section, and finally the 800kg weight space is still used, so that the operation height of 25m is achieved, namely, the operation height is increased by 10%.

According to the technical scheme of the embodiment of the invention, the first cover plate 3 is made of ultrathin plates with the thickness of 2mm, and the first concave part 5 and the second concave part 6 which are formed at the welding seam by matching the first cover plate 3 and the second cover plate 4 greatly reduce the weight of the arm section under the condition of not reducing or even increasing the structural strength of the arm section, reduce the weight of the arm section corresponding to the unit length, realize the light weight of the arm frame, enable the length of the arm frame to be longer within a limited weight limit range, enable the number of the arm sections included by the arm frame to be more, and further improve the height of the lifting operation, and enable the highest operation range of the blue-brand high-altitude operation vehicle to exceed the highest level of the existing industry. And the butt-splice welding of the 2mm and 3mm ultrathin steel plates is easy to realize in the process, the welding seam of the first cover plate 3 and the second cover plate 4 is approximately positioned in the middle of the height direction of the arm section, and for the arm frame type bending structural member, the welding seam is a neutral layer and is not easy to crack.

Referring to fig. 1 to 3, and 6 to 13, a slider assembly provided between the first arm section 1 and the second arm section 2 will be described. The sliding block component is positioned at the gap between the first arm section 1 and the second arm section 2, so that the functions of mutual support, guide and the like of the first arm section 1 and the second arm section 2 are realized. The inventor finds that with higher and higher requirements on operation amplitude and light weight, the structural strength of the arm support is important to ensure. When the arm support works, the maximum stress of the arm support appears in contact areas of the sliding blocks and the arm sections, and the areas are easy to cause local crushing. Therefore, in order to meet the requirements of light weight and safety, the reasonable design of the sliding block assembly is very critical for improving the bearing capacity of the arm support.

Referring to fig. 6-8, 12 and 13, in some embodiments, the arm section further comprises a first slider assembly 7, the first slider assembly 7 being mounted to the first arm section 1, in particular, the first slider assembly 7 being mounted to the trailing end of the first arm section 1. The first slider assembly 7 comprises a first slider 71 located at the top of the outer side of the first arm section 1. Here, referring to fig. 7 and 12, when the first arm segment 1 does not extend relative to the second arm segment 2, a first gap δ 1 exists between the first slider 71 and the inner wall of the second arm segment 2. Referring to fig. 7 and 13, when the arm support is loaded and the first arm section 1 is fully extended relative to the second arm section 2, the first sliding block 71 is fully attached to the inner wall of the second arm section 2. Here, the load condition borne by the boom is set to be, for example, 1.0 to 1.7 times, specifically, 1.5 times, of the rated load of the boom.

Referring to fig. 6 to 8, 12, and 13, the first slider 71 includes a first gap portion 711 and a first attaching portion 712. The first attaching portion 712 is fixedly connected to or integrated with the first gap portion 711. The first gap 711 is fixed to the outside of the top plate 32 of the first cover 3. When the first arm segment 1 does not extend relative to the second arm segment 2, a first gap δ 1 exists between the first gap 711 and the inner wall of the second arm segment 2. When the arm support bears the load, and when the first arm section 1 completely extends out relative to the second arm section 2, the first gap part 711 completely fits with the inner wall of the second arm section 2. The first attaching portion 712 is fixed to the outer side of the first side plate 31 or the second side plate 33 of the first cover 3. Here, the load condition borne by the boom is set to be, for example, 1.0 to 1.7 times, specifically, 1.5 times, of the rated load of the boom. If the load carried by the arm support does not reach the set value, the state of the first gap part 711 and the inner wall of the second arm section 2 is between two states of complete contact and first gap delta 1.

The shape of the first gap 711 on the side where the top plate 32 is bonded matches the shape of the outer wall of the top plate 32, and the two are completely bonded. A side surface of the first gap portion 711 remote from the top plate 32, which is configured as a convex circular arc, is for contact with the inner wall of the second arm section 2. In the width direction of the arm section, the end part of the convex arc far away from the first attaching part 712 contacts with the inner wall of the second arm section 2, and the rest part of the convex arc has a first gap δ 1 with the inner wall of the second arm section 2.

Referring to fig. 6-8, 12 and 13, in some embodiments, the total width of the arm segment in the width direction of the arm segment is w1, and the lower limit of the first gap δ 1 is: 0.0168 xw 1-2.64; the upper limit of the first gap δ 1 is: 0.0336 xw 1-5.28. Since the first gap portion 711 is a convex arc, gaps between the arc areas and the inner wall of the second arm section 2 are not equal, and the first gap δ 1 is the maximum gap between the first gap portion 711 and the inner wall of the second arm section 2.

Referring to fig. 6 to 8, 12 and 13, in some embodiments, the number of the first sliders 71 is two, one of the first sliders 71 is located at a corner of the top plate 32 and the first side plate 31 of the first cover plate 3, and the first attaching portion 712 of the first slider 71 is fixed to the first side plate 31 of the first cover plate 3. The other first slider 71 is located at a corner of the top plate 32 and the second side plate 33 of the first cover plate 3, and the first fitting portion 712 of the first slider 71 is fixed to the second side plate 33 of the first cover plate 3.

The first sliding blocks 71 adopt the structure comprising the first gap parts 711 and the first attaching parts 712, on one hand, the first attaching parts 712 of the two first sliding blocks 71 are mutually matched to limit the first arm section 1 in the width direction of the first arm section 1; on the other hand, the first gap parts 711 of the two first sliding blocks 71 play a limiting role on the first arm section 1 at two positions in the width direction of the arm section, so that the stress on the first arm section 1 is more stable; on the other hand, the first slider 71 as a whole can be mounted in place by one-time mounting of the first gap portion 711 and the first attaching portion 712, and the number of sliders to be mounted is reduced without reducing the functions.

With continued reference to fig. 6-8, 12, and 13, in some embodiments, the first slider assembly 7 further includes a second slider 72 and a third slider 73. The second sliding block 72 is fixed on the outer side of the flat plate 421 of the first arm section 1; the second slider 72 and the first gap 711 cooperate to limit the first arm section 1 in the height direction of the arm support. The number of the third sliders 73 is two; one of the third sliding blocks 73 is fixed at the bending position of the first bending plate 422, and the other third sliding block 73 is fixed at the bending position of the second bending plate 423; the two third sliding blocks 73 are matched with each other to limit the first arm section 1 in the height direction and the width direction of the arm support.

Referring to fig. 9-13, in some embodiments, the arm section further comprises a second slider assembly 8, the second slider assembly 8 being mounted to the second arm section 2; the second slider assembly 8 comprises a fourth slider 81 located at the bottom of the inner wall of the second arm section 2. Here, referring to fig. 9 and 12, when the first arm segment 1 does not extend relative to the second arm segment 2, the fourth slider 81 has a second gap δ 2 with the outer wall of the first arm segment 1. Referring to fig. 9 to 13, when the arm support is loaded and the first arm section 1 is fully extended relative to the second arm section 2, the fourth sliding block 81 is fully attached to the outer wall of the first arm section 1. Here, the load condition borne by the boom is set to be, for example, 1.0 to 1.7 times, specifically, 1.5 times, of the rated load of the boom. If the load carried by the arm support does not reach the set value, the state of the fourth sliding block 81 and the outer wall of the first arm section 1 is between the two states of complete fit and second gap delta 2.

Because the fourth sliding block 81 is a convex arc, the gaps between the arc areas and the outer wall of the first arm section 1 are not equal, and the second gap δ 2 is the maximum gap between the fourth sliding block 81 and the outer wall of the first arm section 1.

In some embodiments, the lower limit of the second gap δ 2 is

The upper limit of the second gap is

The total width of the bottom plate 42 is w1, and the width of the flat plate 421 is w 2.

Referring to fig. 9-13, in some embodiments, the second slider assembly 8 further includes a fifth slider 82. The number of the fifth sliding blocks 82 is two, wherein one of the fifth sliding blocks 82 is installed at the bending position of the first bending plate 422 of the second arm section 2, and the other fifth sliding block 82 is installed at the bending position of the second bending plate 423 of the second arm section 2.

The first arm section 1 and the second arm section 2 are nested, a first bending plate of the first arm section 1 corresponds to a first bending plate of the second arm section 2, and a second bending plate of the first arm section 1 corresponds to a second bending plate of the second arm section 2. When the arm support structure is loaded, the section of the arm section deforms as shown in fig. 13, the deformation at the bending part of the first arm section 1 is small, and the deformation at the flat part is large. The fifth sliding block 82 provided by the technical scheme is adopted, and the fifth sliding block 82 is arranged at the corner of the cross section of the second arm section 2, so that the number of sliding blocks required by the arm support can be reduced, the installation is convenient, the contact gap can be reduced, the contact stress is reduced, and the safety factor of the arm section is improved.

Referring to fig. 9 to 13, when the first arm segment 1 does not extend relative to the second arm segment 2, the fifth slider 82 has a third gap δ 3 with the outer wall of the first arm segment 1. Referring to fig. 8, 9 and 13, when the arm support is loaded and the first arm section 1 is fully extended relative to the second arm section 2, the fifth slider 82 is fully engaged with the outer wall of the first arm section 1. Here, the load condition borne by the boom is set to be, for example, 1.0 to 1.7 times, specifically, 1.5 times, of the rated load of the boom. After first arm festival 1 stretches out, first arm festival 1 warp under dead weight and the state of bearing, after first arm festival 1 warp, install in the outer wall of the fifth slider 82 of second arm festival 2 and first arm festival 1 and laminate completely, third clearance delta 3 becomes 0, just so increased the area of contact of fifth slider 82 with first arm festival 1, the stress that first arm festival 1 received has been reduced, the local conquassation phenomenon has been avoided appearing, the factor of safety of cantilever crane has been improved.

The fifth sliding block 82 is in a convex arc shape, gaps between each area of the arc shape of the fifth sliding block 82 and the outer wall of the first arm section 1 are not equal, and the third gap delta 3 refers to the maximum gap between the fifth sliding block 82 and the outer wall of the first arm section 1.

Referring to fig. 9 and 10, the fifth slider 82 includes a second gap portion 821 and a second fitting portion 822, which are integrated or fixedly connected. The surface of the second gap portion 821 facing the first arm section 1 is configured in a convex arc shape to form a third gap δ 3 between the second gap portion 821 and the first arm section 1. The surface of the second fitting portion 822 facing the first arm segment 1 is flat. The second gap 821 is fixedly connected to one of the first bending plate 422 and the second bending plate 423. The second attaching portion 822 is fixedly connected to one of the third side plate 41 and the fourth side plate 43.

In some embodiments, the number of fifth sliders 82 is two. The second gap 821 of one of the fifth sliders 82 is attached to and fixedly connected to the first bending plate 422, and the second attaching portion 822 is attached to and fixedly connected to the third side plate 41. The second gap 821 of the other fifth slider 82 is attached to and fixedly connected to the second bending plate 423, and the second attaching portion 822 is attached to and fixedly connected to the fourth side plate 43.

Wherein, when the first arm section 1 does not extend relative to the second arm section 2, the second gap portion 821 and the outer wall of the first arm section 1 have a third gap δ 3. When the arm support is loaded and the first arm section 1 is fully extended relative to the second arm section 2, the second gap portion 821 is fully attached to the outer wall of the first arm section 1. Here, the load condition borne by the boom is set to be, for example, 1.0 to 1.7 times, specifically, 1.5 times, of the rated load of the boom. If the load is less than the set value, the second clearance portion 821 and the outer wall of the first arm section 1 are in a state of being completely attached to each other with the third clearance δ 3.

In some embodiments, the lower limit of the third gap δ 3 is

The upper limit of the third gap δ 3 is

For the overhead working truck, the rated working weight specified by the national standard is 200kg (2 adult men + small tools), and a slight overload phenomenon exists in the actual working process. By adopting the special size design of the first gap delta 1, the second gap delta 2 and the third gap delta 3, the arc-shaped sliding surface of the corresponding arc-shaped sliding block can be ensured to be in full contact with the arm section when the rated load is 1.5 times and the arm support is completely extended to the maximum working amplitude of 25m, the maximum contact stress of the arm section under the most dangerous working condition is reduced by 40%, and the safety of high-altitude operation is improved.

In some embodiments, the two fifth sliding blocks 82 cooperate with each other to limit the first arm section 1 in both the width direction and the height direction of the arm support. In a state where the first arm section 1 is not extended, both the fifth sliders 82 have a gap from the first arm section 1 in the height direction; after the first arm section 1 extends out, due to the dead weight and the bearing of the first arm section 1, after the first arm section 1 deforms, the first arm section 1 and the two fifth sliding blocks 82 are completely attached in the height direction, so that the contact area between the first sliding block 71 and the first arm section 1 is increased, the stress on the first arm section 1 is reduced, and the safety factor of the arm section is further improved. The positions of the two fifth sliding blocks 82 in the width direction of the arm section are different, so that the stress of the first arm section 1 in the width direction is more balanced.

Referring to fig. 9 to 13, in some embodiments, the second slider assembly 8 further includes two sixth sliders 83, one of the sixth sliders 83 is fixed to the joint between the top plate 32 of the first cover plate 3 of the second arm section 2 and the first side plate 31, and the other is fixed to the joint between the top plate 32 of the first cover plate 3 of the second arm section 2 and the second side plate 33. The two sixth sliding blocks 83 are matched with the fourth sliding block 81 to limit the first arm section 1 in the width direction and the height direction of the arm support.

When the first arm section 1 is installed in place and does not extend out, the sixth sliding block 83 is completely attached to the first arm section 1; at this time, the fourth slider 81 has a second gap with the first arm section 1, and the fifth slider 82 has a third gap with the first arm section 1. The first arm section 1 deforms after extending out of place, and the sixth sliding block 83 is not contacted with the first arm section 1 any more; at this time, the fourth slider 81 and the first arm segment 1 are completely attached, and the fifth slider 82 and the first arm segment 1 are completely attached.

It can be seen that the sixth slider 83 is not loaded, and mainly acts as a limit for the first arm section 1. The sixth sliding blocks 83 are of block structures with L-shaped cross sections, so that the two sixth sliding blocks 83 are matched with each other in the width direction of the arm support to limit the first arm section 1 in the width direction of the arm support, and the first arm section 1 does not shake in the width direction. In the height direction of the arm support, the two sixth sliding blocks 83, the fourth sliding block 81 and the fifth sliding block 82 can both play a role in cooperation so as to limit the first arm section 1 in the height direction, so that the first arm section 1 does not shake in the height direction.

In some embodiments, the second slider assembly 8 is located downstream of the first slider assembly 7 in the direction of extension of the first arm segment 1. The maximum extension of the first arm segment 1 relative to the second arm segment 2 is determined by the control cylinder of the first arm segment 1 and the corresponding controller.

Under the limiting effect of the first sliding block assembly 7 and the second sliding block assembly 8, when the first arm section 1 is fully contracted, the first arm section 1 and the second arm section 2 do not move relatively in any direction except the extending direction. In actual operation, as the arm section extending distance is larger, the contact pressure between the first arm section 1 and the first slide block 71 of the first slide block assembly 7, the fourth slide block 81 of the second slide block assembly 8 and the fifth slide block 82 is larger, the deformation of the cross section of the first arm section 1 is larger, and the first arm section 1 fits the arc-shaped slide surface, so that the contact area between the first arm section 1 and the first slide block 71, the fourth slide block 81 and the fifth slide block 82 is increased. Compared with the conventional slider with a planar structure, the structure of the first slider 71 of the first slider assembly 7 and the structures of the fourth slider 81 and the fifth slider 82 of the second slider assembly 8 provided by the embodiment of the invention can reduce the contact stress by more than 40%. When the first arm section 1 is folded (the moment is small, the stress is small, and the working condition is safe), the contact surface is small, as shown in fig. 12; referring to fig. 13, when the first arm section 1 extends out (the moment is large, the stress is large, and the dangerous working condition is met), the section of the arm section is extruded and deformed, and has a larger contact surface with the sliding block, so that the contact stress is reduced by more than 40% compared with the traditional plane sliding block, and the safety factor of the arm support is effectively improved.

Taking the arm support as an example that the arm support comprises five arm sections, the three arm sections positioned in the middle are not only inner arm sections but also outer arm sections, so that the three arm sections in the middle are provided with the first sliding block component 7 and the second sliding block component 8. Specifically, the first slider assembly 7 is mounted at the tail of the arm sections located in the middle, and the second slider assembly 8 is mounted at the head. The outermost arm segment, which is provided with the second slider assembly 8 only at the head. The innermost arm segment, which is provided with the first slider assembly 7 only at the tail. Of course, the arm segments may also include six, or even seven arm segments. Each arm section in the middle of the sliding block is also provided with a first sliding block component 7 and a second sliding block component 8 at the same time, the arm section on the outermost side is only provided with the second sliding block component 8 at the head, and the arm section on the innermost side is only provided with the first sliding block component 7 at the tail.

According to the technical scheme, when the arm support is fully contracted, the first arm section 1 and the second arm section 2 do not move relatively in any direction except the extending direction. In actual work, as the extending distance of the arm support is larger, the head of the first arm section 1 is pressed to be sunken, the contact pressure of the first arm section 1 with the fourth sliding block 81 and the fifth sliding block 82 is larger, the deformation of the section of the first arm section 1 is larger, and therefore the first arm section 1 is more fit with the sliding surfaces of the arc-shaped sliding blocks of the fourth sliding block 81 and the fifth sliding block 82; the tail part of the second arm section 2 is pressed to be protruded, and the shape of the deformed second arm section 2 is more matched with the arc-shaped surface of the first sliding block 71, so that the contact areas of the first sliding block 71, the fourth sliding block 81 and the fifth sliding block 82 with the first arm section 1 and the second arm section 2 are increased, as shown in fig. 12 and 13, the contact stress of the first arm section 1 and the second arm section 2 is reduced, and the structural safety of the arm support is improved. When the arm section is loaded and deformed, the contact area of the traditional plane sliding block is smaller and smaller, so that the stress of the contact area is increased sharply, and by adopting the technical scheme of the embodiment of the invention, compared with the sliding block with the traditional plane structure, the contact stress is reduced by more than 40%.

In addition, for the arm support of the high-altitude operation vehicle, the area corresponding to the sliding block assembly is divided into an installation area and a movement area. The mounting region is a region where each of the sliders of the first slider assembly 7 and the second slider assembly 8 is mounted to the corresponding arm section.

For the first slider 71, the second slider 72, and the third slider 73 mounted to the first arm section 1, the mounting area is a surface to which the first slider 71, the second slider 72, and the third slider 73 are fixedly connected to the first arm section 1; the movement region refers to the surfaces of the first slider 71, the second slider 72, and the third slider 73 that face the second arm segment 2.

For the fourth, fifth and sixth slider guides 82, 83 mounted to the second arm segment 2, the mounting areas are the surfaces to which the fourth, fifth and

sixth sliders

81, 82, 83 are fixedly connected to the second arm segment 2, respectively; the movement region refers to the surfaces of the fourth slider 81, the fifth slider 82, and the sixth slider 83 facing the first arm section 1.

After the slide block is fixed, the installation area is determined, and the area of the installation area is small. The installation area is reinforced, the weight of the arm section cannot be obviously increased, and the extension and retraction of the arm support cannot be influenced. The motion area is non-fixed and large in area, the motion area is locally reinforced, the expansion and contraction of the arm support are influenced, and the weight of arm sections is obviously increased.

In the prior art, in order to increase the structural strength of the arm section, the arm section in the installation area is reinforced to improve the local strength and rigidity, common reinforcing forms include welding steel plates, welding vertical reinforcing ribs, adding steel backing plates and the like, and the reinforcement in the area does not influence the sliding of the arm section; for the arm section in the motion area of the sliding block, no effective means is provided for reinforcement except for the integral thickening of the arm section. According to the technical scheme of the embodiment of the invention, the problem is creatively solved, on one hand, the first arm section and the second arm section are processed by adopting ultrathin steel plates, namely, the wall thickness of each arm section of the arm support is integrally reduced, then the integral strength and rigidity of the arm support structure are ensured by designing the section shape of the special arm section, and the problem of local crushing caused by overlarge stress of the arm section in a sliding block movement area is solved by designing the structures of the special first sliding block assembly 7 and the special second sliding block assembly 8, so that the reliability of the arm support structure is improved.

Fig. 14 shows another realization of the boom, and in the embodiment illustrated in fig. 11, the first cover plate 3 is also substantially U-shaped in cross-section. But the free end of the U-shape is configured to be convex. Fig. 11 shows another realization of the arm support, and in the embodiment illustrated in fig. 14, the free end of the second cover plate 4 is configured to be convex.

Specifically, in some embodiments, the free end of the first side panel 31 is configured to be convex, the free end of the third side panel 41 is configured to be convex, and the free end of the first side panel 31 and the free end of the third side panel 41 are pieced together to form the first protruding portion 9. The free end of the second side plate 33 is configured to be convex, the free end of the fourth side plate 43 is configured to be convex, and the free end of the second side plate 33 and the free end of the fourth side plate 43 are pieced together to form the second boss 10.

Referring to fig. 14, in some embodiments, the first protrusion 9 and the second protrusion 10 have equal heights and are both 30mm to 55mm, such as 30mm, 35mm, 40mm, 45mm, 50mm, and 55 mm. The first and

second protrusions

9 and 10 are equal in structure, and the height of the first protrusion 9 is the distance of the CD.

Adopt first bellying 9 and second bellying 10 to replace first interior recess 5, the interior recess 6 of second above, also can play the difficult buckling instability that takes place in protection arm festival side, and then promote the limit bearing capacity of arm festival.

Referring to fig. 15, an embodiment of the present invention further provides a method for manufacturing the arm support, which is used for manufacturing the arm support described above. The manufacturing method of the arm support comprises the following steps:

step S100, bending the steel plate to form the first cover plate 3. The structure of the first cover plate 3 is described above.

And step S200, bending the steel plate to form a second cover plate 4. The structure of the second cover plate 4 is described above.

And step S300, welding the first cover plate 3 and the second cover plate 4 to form an arm section.

And S400, nesting the multiple sections of arm sections to form the arm support.

In some embodiments, step S400 specifically includes the following steps: a first sliding block component 7 is arranged at the tail end of the first arm section 1; nesting a first arm section 1 and a second arm section 2; a second slider assembly 8 is mounted at the head end of the second arm section 2.

After the two arm sections are nested, the whole arm section is used as an inner arm, namely a first arm section, and then a section of outer arm is nested. And repeating the steps until the nesting of the arm sections is completed.

The arm support obtained by the manufacturing method has the beneficial effects introduced above.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An arm support, characterized by, includes at least two nested arm sections, at least one said arm section includes:

a first cover plate (3) configured as a single piece, the first cover plate (3) comprising a first side plate (31), a top plate (32), and a second side plate (33) arranged in sequence; the first side plate (31) and the second side plate (33) are arranged opposite to each other, the free end of the first side plate (31) remote from the top plate (32) is convex or concave, and the free end of the second side plate (33) remote from the top plate (32) is also convex or concave; and

a second cover plate (4) configured as a single piece, the second cover plate (4) comprising a third side plate (41), a bottom plate (42), and a fourth side plate (43) arranged in sequence; the third side plate (41) and the fourth side plate (43) are arranged opposite to each other, the free end of the third side plate (41) facing away from the base plate (42) is convex or concave, and the free end of the fourth side plate (43) facing away from the base plate (42) is also convex or concave;

wherein the free end of the first side plate (31) and the free end of the third side plate (41) are fixedly connected, and the free end of the second side plate (33) and the free end of the fourth side plate (43) are fixedly connected, so that the first cover plate (3) and the second cover plate (4) enclose a closed contour.

2. The boom according to claim 1, characterized in that the free end of the first side plate (31) is configured to be concave, the free end of the third side plate (41) is configured to be concave, the free end of the first side plate (31) and the free end of the third side plate (41) are pieced together to form a first inner recess (5);

the free end of the second side plate (33) is configured to be concave, the free end of the fourth side plate (43) is configured to be concave, and the free end of the second side plate (33) and the free end of the fourth side plate (43) are spliced to form a second inner concave part (6).

3. The boom according to claim 1, characterized in that the first concave part (5) and the second concave part (6) have the same height and are both 30 mm-55 mm.

4. Boom according to claim 1, characterized in that the free end of the first side plate (31) is configured to be convex and the free end of the third side plate (41) is configured to be convex, the free end of the first side plate (31) and the free end of the third side plate (41) together forming a first boss (9);

the free end of the second side plate (33) is configured to be convex, the free end of the fourth side plate (43) is configured to be convex, and the free end of the second side plate (33) and the free end of the fourth side plate (43) are spliced to form a second convex part (10).

5. The boom according to claim 4, characterized in that the first protruding part (9) and the second protruding part (10) have the same height and are both 30 mm-55 mm.

6. The boom according to claim 1, characterized in that the wall thickness of the first cover plate (3) is 2mm and the wall thickness of the second cover plate (4) is 2mm or 3 mm.

7. The boom according to claim 1, characterized in that the floor (42) comprises:

a flat plate (421) parallel to the top plate (32);

a first bending plate (422) configured to be bent, the first bending plate being located at one side of the flat plate (421) in a length direction, an angle θ between the first bending plate (422) and the flat plate (421); the first bending plate (422) is fixedly connected with the first side plate (31); and

a second bending plate (423) configured to be bent, the second bending plate being located at the other side of the flat plate (421) in the length direction, the second bending plate (423) also having an angle θ with the flat plate (421); the second bending plate (423) is fixedly connected with the second side plate (33);

wherein θ is greater than 90 ° and less than 180 °.

8. The boom of claim 7, wherein θ is between 150 ° and 170 °.

9. The boom according to claim 7, characterized in that in the width direction of the arm sections, the total width of the arm sections is w1, the width of the plate (421) is w 2;

wherein the lower limit value of w2 is: 0.158 × w1+ 29.2;

the upper limit value of w2 is: 0.194 × w1+ 35.6.

10. The boom of claim 1, wherein in the width direction of the arm sections, the total width of the arm sections is w1, and the height of the arm sections is h 1;

wherein, the lower limit value of h1 is: 1.64 xw 1-87.4;

the upper limit value of h1 is: 2.01 xw 1-107.

11. The boom according to claim 7, characterized in that the two nested arm sections are a first arm section (1) and a second arm section (2); the first arm section (1) is nested on the inner side of the second arm section (2); the arm section further includes:

a first slider assembly (7) mounted to the first arm section (1); the first sliding block assembly (7) comprises a first sliding block (71) which is positioned at the top of the outer side of the first arm section (1);

wherein, when the first arm section (1) does not extend relative to the second arm section (2), a first gap delta 1 exists between the first sliding block (71) and the inner wall of the second arm section (2); when the arm support bears the load, and when the first arm section (1) completely extends out relative to the second arm section (2), the first sliding block (71) is completely attached to the inner wall of the second arm section (2).

12. The boom according to claim 11, characterized in that in the width direction of the arm section, the total width of the arm section is w1, and the lower limit of the first gap δ 1 is: 0.0168 xw 1-2.64; the upper limit of the first gap δ 1 is: 0.0336 xw 1-5.28.

13. The boom according to claim 11, characterized in that the first slider (71) comprises:

a first gap part (711) fixed to the outside of the top plate (32) of the first cover plate (3); wherein, when the first arm section (1) does not extend relative to the second arm section (2), a first gap δ 1 exists between the first gap part (711) and the inner wall of the second arm section (2); when the arm support bears the load, and when the first arm section (1) completely extends out relative to the second arm section (2), the first gap part (711) is completely attached to the inner wall of the second arm section (2); and

a first attaching portion (712) fixedly connected to or integrated with the first gap portion (711); the first attaching portion (712) is fixed to the outer side of the first side plate (31) or the second side plate (33) of the first cover plate (3).

14. The boom according to claim 13, characterized in that the surface of the first gap section (711) facing the second arm section (2) is configured as a convex arc.

15. The boom according to claim 13, characterized in that the first slider assembly (7) further comprises:

the second sliding block (72) is fixed on the outer side of the flat plate (421) of the first arm section (1); the second sliding block (72) is matched with the first gap part (711) to limit the first arm section (1) in the height direction of the arm support; and

three sliders (73), the number of which is two; one third sliding block (73) is fixed at the bent part of the first bending plate (422), and the other third sliding block (73) is fixed at the bent part of the second bending plate (423); the two third sliding blocks (73) are matched with each other to limit the first arm section (1) in the height direction and the width direction of the arm support.

16. The boom according to claim 11, characterized in that the number of the first sliding blocks (71) is two, wherein one of the first sliding blocks (71) is fixed at the joint of the first side plate (31) and the top plate (32), and the other first sliding block (71) is fixed at the joint of the second side plate (33) and the top plate (32).

17. The boom of claim 11, wherein the arm sections further comprise:

a second slider assembly (8) mounted to the second arm section (2); the second sliding block assembly (8) comprises a fourth sliding block (81) which is positioned at the bottom of the inner wall of the second arm section (2);

wherein, when the first arm section (1) does not extend relative to the second arm section (2), the fourth sliding block (81) has a second gap delta 2 with the outer wall of the first arm section (1); when the arm support bears the load, and when the first arm section (1) completely extends out relative to the second arm section (2), the fourth sliding block (81) is completely attached to the outer wall of the first arm section (1).

18. The boom of claim 17, wherein the lower limit of the second gap δ 2 is

The upper limit of the second gap is

Wherein the total width of the bottom plate (42) is w1, and the width of the flat plate (421) is w 2.

19. The boom according to claim 17, characterized in that the second slider assembly (8) further comprises:

the number of the fifth sliding blocks (82) is two, one of the fifth sliding blocks (82) is arranged at the bent part of the first bending plate (422), and the other fifth sliding block (82) is arranged at the bent part of the second bending plate (423); when the first arm section (1) does not extend relative to the second arm section (2), a third gap delta 3 exists between the fifth sliding block (82) and the outer wall of the first arm section (1); when the arm support bears the load, and when the first arm section (1) completely extends out relative to the second arm section (2), the fifth sliding block (82) is completely attached to the outer wall of the first arm section (1).

20. The boom of claim 19, wherein the lower limit of the third gap δ 3 is

The upper limit of the third gap δ 3 is

21. The boom according to claim 19, characterized in that the fifth slider (82) comprises:

a second gap part (821) fixed to the inner wall of the bottom plate (42) of the second arm section (2); wherein, when the first arm section (1) is not extended relative to the second arm section (2), the second gap portion (821) has a third gap δ 3 with the outer wall of the first arm section (1); when the arm support is loaded and the first arm section (1) is completely extended relative to the second arm section (2), the second gap part (821) is completely attached to the outer wall of the first arm section (1); and

and a second attaching portion (822) fixedly connected to or integrated with the second gap portion (821) and fixed to an inner wall of the third side plate (41) or the fourth side plate (43) of the second arm section (2).

22. The boom according to claim 19, characterized in that the two fifth sliders (82) cooperate with each other to limit the position of the first arm section (1) in both the width direction and the height direction of the boom.

23. The boom according to claim 19, characterized in that the second slider assembly (8) further comprises:

the number of the sixth sliding blocks (83) is two, one of the sixth sliding blocks is fixed at the joint of the top plate (32) of the first cover plate (3) of the second arm section (2) and the first side plate (31), and the other one of the sixth sliding blocks is fixed at the joint of the top plate (32) of the first cover plate (3) of the second arm section (2) and the second side plate (33); the two sixth sliding blocks (83) are matched with the fourth sliding block (81) to limit the first arm section (1) in the width direction and the height direction of the arm support.

24. Boom according to claim 17, characterized in that the second slider assembly (8) is located downstream of the first slider assembly (7) in the direction of extension of the first arm section (1).

25. An aerial lift truck, characterized by comprising the boom of any one of claims 1 to 24.

26. The manufacturing method of the arm support is characterized by comprising the following steps:

bending the steel plate to form a first cover plate;

bending the steel plate to form a second cover plate;

and nesting the multiple sections of arm sections to form the arm support.

27. The method for manufacturing the arm support according to claim 26, wherein the step of nesting the multiple sections of arm sections specifically comprises the steps of:

nesting the first arm section and the second arm section;