Boom, aerial work vehicle and boom manufacturing method

Abstract

The invention discloses a boom, an aerial work vehicle and a boom manufacturing method, which relate to the field of engineering machinery and are used to improve the structure of the boom and enhance the bearing capacity of the boom. The boom comprises at least two nested boom sections. At least one boom section comprises a first cover plate and a second cover plate. The first cover plate is constructed as a whole, and the first cover plate comprises a first side plate, a top plate and a second side plate arranged in sequence; the first and second side plates are arranged relatively, and the free ends of the first and second side plates away from the top plate are both constructed as convex or concave. The second cover plate is constructed as a whole, and the second cover plate comprises a third side plate, a bottom plate and a fourth side plate arranged in sequence; the third and fourth side plates are arranged relatively, and the free ends of the third and fourth side plates away from the bottom plate are constructed as convex or concave. The free ends of the first side plate and the third side plate are fixedly connected, and the free ends of the second side plate and the fourth side plate are fixedly connected, so that the first cover plate and the second cover plate form a closed contour.

Description

Technical Field

[0001] The invention relates to the field of engineering machinery, and in particular to a boom, an aerial work vehicle and a method for manufacturing the boom. Background Art

[0002] Aerial work vehicles are widely used in the fields of construction, municipal maintenance, firefighting, etc. Among them, blue-plate aerial work vehicles refer to aerial work vehicles that can use household car license plates. Blue-plate aerial work vehicles have the advantages of unrestricted access within the city and simple operation, but the quality and size of the whole vehicle are strictly restricted by national standards, making it difficult to apply the structure and parameters of conventional engineering aerial work vehicles. In recent years, as aerial vehicle products have gradually developed towards large numbers, their lightweight requirements have also become increasingly higher.

[0003] At present, the box-type single-section telescopic boom sections of aerial work vehicles are mostly quadrilateral, pentagon, hexagon and U-shaped.

[0004] The inventors have discovered that the prior art has at least the following problems: conventional quadrilateral, pentagonal, hexagonal and U-shaped cross-sections have unreasonable designs and are prone to local crushing and buckling failure. Summary of the invention

[0005] The invention provides a boom, an aerial work vehicle and a boom manufacturing method, which are used to improve the structure of the boom and enhance the bearing capacity of the boom.

[0006] An embodiment of the present invention provides a boom, comprising at least two nested boom sections, at least one of the boom sections comprising:

[0007] A first cover plate, which is constructed as an integral body, comprises a first side plate, a top plate and a second side plate which are sequentially arranged; the first side plate and the second side plate are arranged opposite to each other, a free end of the first side plate away from the top plate is constructed to be convex or concave, and a free end of the second side plate away from the top plate is also constructed to be convex or concave; and

[0008] The second cover plate is constructed as a whole, and the second cover plate comprises a third side plate, a bottom plate and a fourth side plate which are arranged in sequence; the third side plate and the fourth side plate are arranged opposite to each other, and the free end of the third side plate away from the bottom plate is constructed to be convex or concave, and the free end of the fourth side plate away from the bottom plate is also constructed to be convex or concave;

[0009] The free end of the first side plate is fixedly connected to the free end of the third side plate, and the free end of the second side plate is fixedly connected to the free end of the fourth side plate, so that the first cover plate and the second cover plate form a closed outline.

[0010] 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 assembled to form a first inner concave portion;

[0011] 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 assembled to form a second inner concave portion.

[0012] In some embodiments, the first inner recess and the second inner recess have the same height, and are both between 30 mm and 55 mm.

[0013] 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 assembled to form a first protrusion;

[0014] 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 assembled to form a second protrusion.

[0015] In some embodiments, the first protrusion and the second protrusion have the same height, and are both between 30 mm and 55 mm.

[0016] In some embodiments, the wall thickness of the first cover plate is 2 mm, and the wall thickness of the second cover plate is 2 mm or 3 mm.

[0017] In some embodiments, the base plate comprises:

[0018] a flat plate, parallel to the top plate;

[0019] a first bending plate, configured to be bent, the first bending plate being located at one side of the length direction of the flat plate, the angle between the first bending plate and the flat plate being θ; the first bending plate being fixedly connected to the first side plate; and

[0020] The second bending plate is configured to be bent, the second bending plate is located at the other side of the length direction of the flat plate, and the angle between the second bending plate and the flat plate is also θ; the second bending plate is fixedly connected to the second side plate;

[0021] Wherein, the angle θ is greater than 90° and less than 180°.

[0022] In some embodiments, the angle θ is between 150° and 170°.

[0023] In some embodiments, in the width direction of the arm section, the total width of the arm section is w1, and the width of the flat plate is w2;

[0024] Among them, the lower limit value of w2 is: 0.158×w1+29.2;

[0025] The upper limit value of w2 is: 0.194×w1+35.6.

[0026] In some embodiments, in the width direction of the arm section, the total width of the arm section is w1, and the height of the arm section is h1;

[0027] Among them, the lower limit value of h1 is: 1.64×w1-87.4;

[0028] The upper limit value of h1 is: 2.01×w1-107.

[0029] In some embodiments, the two nested arm sections are a first arm section and a second arm section; the first arm section is nested inside the second arm section; the arm section further comprises:

[0030] A first slider assembly is mounted on the first arm section; the first slider assembly comprises a first slider located at the outer top of the first arm section;

[0031] Among them, when the first arm section is not extended relative to the second arm section, there is a first gap δ1 between the first slider and the inner wall of the second arm section; when the arm frame is loaded and when the first arm section is fully extended relative to the second arm section, the first slider is completely fitted with the inner wall of the second arm section.

[0032] 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 δ1 is: 0.0168×w1-2.64; the upper limit of the first gap δ1 is: 0.0336×w1-5.28.

[0033] In some embodiments, the first slider includes:

[0034] A first gap portion is fixed to the outer side of the top plate of the first cover plate; wherein, when the first arm section is not extended relative to the second arm section, a first gap δ1 exists between the first gap portion and the inner wall of the second arm section; when the arm frame is loaded and the first arm section is fully extended relative to the second arm section, the first gap portion is completely in contact with the inner wall of the second arm section; and

[0035] The first fitting portion is fixedly connected to or integral with the first gap portion; the first fitting portion is fixed to the outer side of the first side plate or the second side plate of the first cover plate.

[0036] In some embodiments, a surface of the first gap portion facing the second arm section is configured as an outwardly convex arc.

[0037] In some embodiments, the first slider assembly further comprises:

[0038] A second slider is fixed to the outer side of the flat plate of the first arm section; the second slider cooperates with the first gap portion to limit the first arm section in the height direction of the arm frame; and

[0039] There are two third sliders; one of the third sliders is fixed at the bending part of the first bending plate, and the other third slider is fixed at the bending part of the second bending plate; wherein the two third sliders cooperate with each other to limit the first arm section in both the height direction and the width direction of the arm frame.

[0040] In some embodiments, the number of the first sliding blocks is two, one of the first sliding blocks is fixed to the connection between the first side plate and the top plate, and the other first sliding block is fixed to the connection between the second side plate and the top plate.

[0041] In some embodiments, the arm section further comprises:

[0042] A second slider assembly is mounted on the second arm section; the second slider assembly includes a fourth slider located at the bottom of the inner wall of the second arm section;

[0043] Among them, when the first arm section is not extended relative to the second arm section, there is a second gap between the fourth slider and the outer wall of the first arm section; when the arm frame is loaded and when the first arm section is fully extended relative to the second arm section, the fourth slider is completely fitted with the outer wall of the first arm section.

[0044] In some embodiments, the lower limit of the second gap δ2 is The upper limit of the second gap is

[0045] The total width of the bottom plate is w1, and the width of the flat plate is w2.

[0046] In some embodiments, the second slider assembly further comprises:

[0047] There are two fifth sliders, one of which is installed at the bending part of the first bending plate, and the other is installed at the bending part of the second bending plate; when the first arm section is not extended relative to the second arm section, there is a third gap δ3 between the fifth slider and the outer wall of the first arm section; when the arm frame is loaded and when the first arm section is fully extended relative to the second arm section, the fifth slider is fully fitted with the outer wall of the first arm section.

[0048] In some embodiments, the lower limit of the third gap δ3 is The upper limit of the third gap δ3 is

[0049] The total width of the bottom plate is w1, and the width of the flat plate is w2.

[0050] In some embodiments, the fifth slider includes:

[0051] a second gap portion fixed to the inner wall of the bottom plate of the second arm section; wherein, when the first arm section is not extended relative to the second arm section, a third gap δ3 exists between the second gap portion and the outer wall of the first arm section; when the arm frame is loaded and the first arm section is fully extended relative to the second arm section, the second gap portion is completely in contact with the outer wall of the first arm section; and

[0052] The second fitting portion is fixedly connected to or integrated with the second gap portion, and is fixed to the inner wall of the third side plate or the fourth side plate of the second arm section.

[0053] In some embodiments, the two fifth sliding blocks cooperate with each other to limit the first arm section in both the width direction and the height direction of the arm support.

[0054] In some embodiments, the second slider assembly further comprises:

[0055] There are two sixth sliders, one of which is fixed at the connection between the top plate and the first side plate of the first cover plate of the second arm section, and the other is fixed at the connection between the top plate and the second side plate of the first cover plate of the second arm section; the two sixth sliders cooperate with the fourth slider to limit the first arm section in both the width direction and the height direction of the arm frame.

[0056] In some embodiments, the second slider assembly is located downstream of the first slider assembly in the extension direction of the first arm section.

[0057] An embodiment of the present invention further provides an aerial work vehicle, comprising a boom provided by any technical solution of the present invention.

[0058] The embodiment of the present invention further provides a method for manufacturing a boom, comprising the following steps:

[0059] Bending the steel plate to form a first cover plate;

[0060] bending the steel plate to form a second cover plate;

[0061] welding the first cover plate and the second cover plate to form a boom section;

[0062] Multiple boom sections are nested to form a boom.

[0063] In some embodiments, nesting the multiple boom sections specifically includes the following steps:

[0064] Installing a first slider assembly at the tail end of the first boom section;

[0065] Nesting the first arm section and the second arm section;

[0066] A second slider assembly is installed at the head end of the second boom section.

[0067] The boom provided by the above technical solution adopts a first cover plate and a second cover plate to weld to form an arm section. The cross section of the arm section has concave and convex sections for strengthening the strength, bending resistance and compression resistance of the arm section. The bearing capacity of the boom is significantly improved, and the rigidity of the arm section is also improved to a certain extent, which effectively improves the performance of the boom; and, the concave (or convex) pressing formed by bending and welding the side of the arm section effectively prevents the side plate of the boom from local buckling and instability when it is loaded, thereby improving the safety of the boom structure, which enables the boom to develop in a thinner and longer direction; designing an ultra-thin arm section structure is conducive to improving the lightweight level of the arm section and reducing the weight of the arm section corresponding to the unit length, thereby making the arm section longer, so that the maximum operating range of the blue-brand aerial work vehicle exceeds the existing industry level to meet the requirements of both lightweight and higher working height. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0069] Figure 1 A schematic diagram of the boom structure of an aerial work vehicle provided in some embodiments of the present invention.

[0070] Figure 2 A schematic diagram of a partial three-dimensional structure of an arm provided in some embodiments of the present invention.

[0071] Figure 3 A schematic diagram of a partial front view structure of an arm provided in some embodiments of the present invention.

[0072] Figure 4 A schematic front view of the exploded structure of the first boom section and the second boom section of the boom provided in some embodiments of the present invention.

[0073] Figure 5 A schematic structural diagram of an arm section of an arm support provided in some embodiments of the present invention.

[0074] Figure 6 A schematic diagram of the three-dimensional structure of the first arm section and the first sliding block assembly of the arm provided in some embodiments of the present invention.

[0075] Figure 7 A schematic diagram of the front structural view of the first arm section and the first slider assembly of the arm provided in some embodiments of the present invention.

[0076] Figure 8 A schematic diagram of the gap between the first slider assembly of the first arm section and the second arm section of the arm stand provided in some embodiments of the present invention.

[0077] Fig. 9 A schematic diagram of the three-dimensional structure of the second arm section and the second slider assembly of the arm provided in some embodiments of the present invention.

[0078] Fig.10 A schematic diagram of the front structural view of the second arm section and the second slider assembly of the arm provided in some embodiments of the present invention.

[0079] Fig.11 A schematic diagram of the gap between the second slider assembly of the second arm section and the first arm section of the arm provided in some embodiments of the present invention.

[0080] Fig.12 A schematic diagram of the boom retracted state provided in some embodiments of the present invention.

[0081] Fig.13 Schematic diagram of arm extension deformation provided in some embodiments of the present invention.

[0082] Fig.14 Schematic diagram of the cross section of an arm provided for other embodiments of the present invention.

[0083] Fig.15 A schematic flow chart of a boom manufacturing method provided in some embodiments of the present invention.

[0084] Reference numerals:

[0085] 1. First arm section; 2. Second arm section; 3. First cover plate; 4. Second cover plate; 5. First inner recess; 6. Second inner recess; 7. First slider assembly; 8. Second slider assembly; 9. First protrusion; 10. Second protrusion;

[0086] 31. first side panel; 32. top panel; 33. second side panel;

[0087] 41. third side panel; 42. bottom panel; 43. fourth side panel;

[0088] 421, flat plate; 422, first bent plate; 423, second bent plate;

[0089] 71, first slider; 72, second slider; 73, third slider;

[0090] 711, first gap portion; 712, first laminating portion;

[0091] 81, fourth slider; 82, fifth slider; 83, sixth slider;

[0092] 821. Second gap portion; 822. Second fitting portion. DETAILED DESCRIPTION

[0093] Combine the following Figure 1 to Figure 15 The technical solution provided by the present invention is described in more detail.

[0094] See also Figure 1 Some embodiments of the present invention also provide an aerial work vehicle, including the boom provided by any technical solution of the present invention.

[0095] The number of boom sections included in the boom is 4, 5, 6 or even 7. These boom sections are nested to form a telescopic boom. Figure 1 The figure shows the three arm sections of the boom in the extended state. Figure 1 In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following text mainly explains the ab region in detail.

[0096] See also Figures 2 to 13 Some embodiments of the present invention provide a boom that is particularly suitable for a blue-brand aerial work vehicle. A blue-brand aerial work vehicle is a type of aerial work vehicle that uses the same blue license plate as a family car. Therefore, when traveling in urban traffic, the requirements for the driver are the same as those for the driver of a family car, and the requirements for the size and weight of the vehicle are also the same as those for a family car. Therefore, the weight and size of a blue-brand aerial work vehicle are different from those of a traditional engineering aerial work vehicle. When driving on the road, the upper limits of the weight and size of a blue-brand aerial work vehicle are much lower than those of a traditional engineering aerial work vehicle.

[0097] Under the restriction of such strict national standards, raising the working height of blue-brand aerial work vehicles is still an unremitting pursuit of the industry. The structure of the boom directly affects the working height. The booms of existing blue-brand aerial work vehicles are quadrilateral, pentagon, hexagon and U-shaped. When the booms of these structures reach the current limit of 23m working height, the structure of the booms can no longer bear the total weight of itself and the operating equipment lifted by the booms, and are prone to local crushing and buckling failure, thus causing danger.

[0098] In order to increase the strength of the boom, improve the structure of the boom, and raise the operating height of the boom, the inventor of the present application has proposed the following solution through creative work.

[0099] See also Figures 1 to 3, the boom includes at least two nested boom sections. In some embodiments, the boom includes a four-section boom, a five-section boom, a six-section boom or a seven-section boom, and the total lifting height of the blue-brand aerial work vehicle is not less than 25m. Each boom section can adopt the structure of the boom section described below. Under the premise of ensuring that the overall structure of the boom is more solid and not locally crushed or buckled, the lifting height is increased by about 10% compared to the maximum lifting height of the prior art. The implementation method of the boom is described in detail below.

[0100] See also Figure 1 The arm frame includes 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 taken as an example in which both the inner and outer nested arm sections adopt the arm section structure described below.

[0101] See also Figure 1 For the sake of clear description, the two arm sections that are nested are recorded as the first arm section 1 and the second arm section 2; wherein the first arm section 1 is the inner arm, the second arm section 2 is the outer arm, and the first arm section 1 is nested in the second arm section 2. The first arm section 1 and the second arm section 2 both use the arm section including the first cover plate 3 and the second cover plate 4 described later. The specific implementation method of the arm section is described in detail below.

[0102] See also Figure 1 ,exist Figure 1 The XYZ coordinate system is established in the figure. The X axis represents the length direction of the boom, the Y axis represents the width direction of the boom, and the Z axis represents the height direction of the boom. The positive direction of the X axis is the extension direction of the first boom section 1, and the end of each boom section corresponding to the maximum coordinate value of the X axis is the head; the negative direction of the X axis is the retraction direction of the first boom section 1, and the end of each boom section corresponding to the minimum coordinate value of the X axis is the tail. The length, width, and height directions of each boom section included in the boom are the same as those of the boom.

[0103] See also Figures 1 to 4 The arm section includes a first cover plate 3 and a second cover plate 4. The first cover plate 3 is constructed as a whole, and the first cover plate 3 includes 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, and the free end of the first side plate 31 away from the top plate 32 is constructed to be convex or concave, and the free end of the second side plate 33 away from the top plate 32 is also constructed to be convex or concave. Concave here means concave toward the center point of the width direction and the height direction of the arm frame, and convex means convex relative to the center point of the width direction and the height direction of the arm frame.

[0104] See also Figure 4In some embodiments, there is a rounded corner between the first side plate 31 and the top plate 32, and there is also a rounded corner between the top plate 32 and the second side plate 33. In the height direction of the boom section, the height of the first cover plate 3 is greater than the height of the second cover plate 4. In this way, the weight of the boom section per unit length can be reduced to the maximum extent while ensuring the bearing capacity of the boom section, thereby achieving lightweighting of the boom section and the boom frame.

[0105] See also Figure 4 and Figure 5 The second cover plate 4 is constructed as a whole, and the second cover plate 4 includes 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, and the free end of the third side plate 41 away from the bottom plate 42 is constructed as convex or concave, and the free end of the fourth side plate 43 away from the bottom plate 42 is also constructed as convex or concave. Among them, 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 form a closed outline.

[0106] The above technical solution adopts an integrated first cover plate 3 and second cover plate 4, so that the first cover plate 3 and second cover plate 4 themselves have no welds, thereby reducing the disadvantages caused by welding; and, the first cover plate 3 and second cover plate 4 are formed with recesses and protrusions at the welding points for strengthening the strength of the wall structure, which greatly improves the bearing capacity and buckling failure limit of the boom.

[0107] See also Figure 4 and Figure 5 In some embodiments, in some embodiments, the bottom plate 42 includes a flat plate 421, a first bent plate 422 and a second bent plate 423. The flat plate 421 is parallel to the top plate 32. The first bent plate 422 is configured to be bent, and the first bent plate is located on one side of the length direction of the flat plate 421, and the angle between the first bent plate 422 and the flat plate 421 is θ. The first bent plate 422 is fixedly connected to the first side plate 31. The second bent plate 423 is configured to be bent, and the second bent plate is located on the other side of the length direction of the flat plate 421, and the angle between the second bent plate 423 and the flat plate 421 is also θ. The second bent plate 423 is fixedly connected to the second side plate 33. Wherein, θ is greater than 90° and less than 180°.

[0108] In the above technical solution, the bottom plate 42 of the second cover plate 4 is bent into three sections according to a specific angle and length ratio. The bottom plate 42 adopts this structure of bending toward the first cover plate 3, which is beneficial to increase the compression and bending resistance of the arm section.

[0109] See also Figure 4 and Figure 5In some embodiments, θ is between 150° and 170°, such as 150°, 155°, 160°, 165°, and 170°.

[0110] See also Figure 4 The first cover plate 3 and the second cover plate 4 are symmetrical with respect to the center line L in the width direction of the arm section. The arm section adopts a symmetrical structure and can better withstand symmetrical loads.

[0111] Figure 4 The middle dotted line S is the dividing line between the first cover plate 3 and the fourth cover plate 4 . Figure 4 The upper middle part is the first cover plate 3. Figure 4 It can be seen that the cross section of the first cover plate 3 is substantially U-shaped. The free end of the U-shape of the first cover plate 3 is configured to be concave. Figure 4 The lower middle part is the second cover plate 4. Figure 4 It can be seen that the cross section of the second cover plate 4 is substantially U-shaped, but the bottom of the U is bent. The free end of the U of the second cover plate 4 is configured to be concave.

[0112] Continue to see Figure 4 Specifically, in some embodiments, the free end of the first side plate 31 is concave, the free end of the third side plate 41 is concave, and the free end of the first side plate 31 and the free end of the third side plate 41 are assembled to form a first inner recess 5. The free end of the second side plate 33 is concave, the free end of the fourth side plate 43 is concave, and the free end of the second side plate 33 and the free end of the fourth side plate 43 are assembled to form a second inner recess 6. The above technical solution optimizes the cross-sectional shape of the boom section and improves the bearing capacity and buckling failure limit of the boom through the specially designed structures of the first cover plate 3 and the second cover plate 4.

[0113] Continue to see Figure 4 In some embodiments, the total height of the arm section is h1, and the total width is w1. The units of h1 and w1 are both millimeters (mm), and h1 and w1 satisfy the following functional relationship: The lower limit of h1 is: 1.64×w1-87.4. The upper limit of h1 is: 2.01×w1-107. In the above functional relationship, the units of constants 87.4 and 107 are both millimeters.

[0114] The total height h1 and total width of the boom section are w1. The above parameter range is adopted to improve the bearing capacity and buckling failure limit of the boom. h1 and w1, as the total height and total width of the boom section, will directly affect the weight (weight of the boom section per unit length) and stiffness of the boom section. The above technical scheme gives a functional relationship between h1 and w1, and the h1 and w1 size combination that satisfies the functional relationship makes the stiffness of the boom section optimal. Under the premise of ensuring that the weight of the boom section remains unchanged (the cross section of the boom section is approximately regarded as a rectangle, that is, the sum of h1+h1+w1+w1 remains unchanged), if h1 is increased and w1 is reduced, the horizontal stiffness of the boom section is reduced, and the lateral wind load will cause the left and right swing amplitude to increase, affecting the operation; if w1 is increased and h1 is reduced, the vertical stiffness of the boom section is reduced, and under the action of deadweight and end load, the deflection of the boom section increases, which not only reduces the actual operation amplitude, but also affects the normal operation of telescopic mechanisms such as cylinders and wire ropes.

[0115] Continue to see Figure 4 In some embodiments, the heights h2 of the first inner recess 5 and the second inner recess 6 are equal and are both 30 mm to 55 mm, specifically 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, and 55 mm. The first inner recess 5 and the second inner recess 6 have the same structure. The height h2 of the first inner recess 5 refers to the distance in the Z direction corresponding to the lowest point of the bottom of the first inner recess 5, that is, Figure 4 The concave area of ​​30 to 55 mm is moderate in size. Taking the first inner concave portion 5 as an example, it can control the welding deformation of the first side plate 31 and the third side plate 41, improve the processing quality, and ensure that the overall side surface formed by the first side plate 31 and the third side plate 41 will not be locally unstable prematurely when bent under load, thereby improving the flexion stability of the arm section.

[0116] Continue to see Figure 4 In some embodiments, in the width direction of the arm section, since the thickness of the second cover plate 4 is greater than the thickness 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 the total width of the base plate 42, and the width of the flat plate 421 is w2. Among them, the lower limit value of w2 is: 0.158×w1+29.2. The upper limit value of w2 is: 0.194×w1+35.6. The unit of w2 is millimeter, mm. The units of constants 29.2 and 35.6 are both millimeter. When the total height h1 and the total width w1 of the arm section are determined, w2 and θ jointly determine the specific shapes of the flat plate 421, the first bent plate 422, and the second bent plate 423. The specific shape can significantly improve the bending deformation resistance of the base plate 42 along the extension direction of the arm section. This bending deformation resistance is particularly reflected in Fig.13When the bottom plate 42 is squeezed by the fourth slider 81 and the fifth slider 82 described later, local crushing will not occur prematurely, thereby improving the ultimate bearing capacity of the entire boom structure. Compared with the product with an operating height of 23m in the prior art, the ultimate bearing capacity is increased by 25%.

[0117] from Figure 4 It can be seen that when the boom is horizontally extended, 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 profile. A first inner recess 5 and a second inner recess 6 are formed at the welding place of the first cover plate 3 and the second cover plate 4. The first cover plate 3 and the second cover plate 4 are each formed by bending a whole plate, and the wall thickness of the first cover plate 3 and the second cover plate 4 can be the same or different. The wall thickness of the first cover plate 3 is less 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 2 mm, and the wall thickness of the second cover plate 4 is 2 mm or 3 mm.

[0118] The arm frame includes multiple arm sections, each of which can be made of 2mm steel plates, or the arm sections can be formed by splicing 2mm steel plates and 3mm steel plates. According to the specific vehicle model, the second cover plate 4 of one or two arm sections of the arm frame can be replaced with a 3mm ultra-thin steel plate during design, and the remaining second cover plates 4 can be made of 2mm ultra-thin steel plates to further ensure structural safety. The second cover plate 4 can also be made of a plate with a thickness between 2mm and 3mm.

[0119] The blue-brand aerial work vehicle is required to weigh less than 4500kg. According to the existing market technology, after the cab, frame, legs and other accessories are made extremely lightweight, the weight space left for the boom is about 800kg. If the boom uses 3mm and 4mm steel plates, the maximum overall working height can reach 23m; if 2mm and 3mm steel plates are used, the weight of the boom can be reduced to 600kg at the same working height (that is, the length of each boom section remains unchanged), and the saved 200kg is used to increase the length of each boom section. In the end, the 800kg weight space is still fully used to reach a working height of 25m, that is, a 10% increase in the working height.

[0120] The technical solution of the embodiment of the present invention adopts an ultra-thin plate with a thickness of 2 mm for the first cover plate 3, and cooperates with the first inner recess 5 and the second inner recess 6 formed at the weld of the first cover plate 3 and the second cover plate 4. Without reducing or even increasing the structural strength of the arm section, the weight of the arm section is greatly reduced, and the weight of the arm section corresponding to the unit length is reduced, so as to achieve the lightweight of the boom, so that within the limited weight limit range, the length of the boom section can be longer, and the number of arm sections included in the boom section is more, thereby increasing the height of the lifting operation, so that the highest operating range of the blue-brand aerial work vehicle exceeds the highest level of the existing industry. In addition, the butt welding of 2mm and 3mm ultra-thin steel plates is easy to realize in terms of technology, and the weld of the first cover plate 3 and the second cover plate 4 is approximately located in the middle position of the height direction of the arm section. For the bending structure of the boom section, this place is the neutral layer, and the weld is not easy to crack.

[0121] See also Figures 1 to 3 , Figures 6 to 13 , the following introduces the slider assembly arranged between the first boom section 1 and the second boom section 2. The slider assembly is located in the gap between the first boom section 1 and the second boom section 2, and realizes the functions of mutual support and guidance between the first boom section 1 and the second boom section 2. The inventors have found that as the operating range and lightweight requirements become higher and higher, it is very important to ensure the structural strength of the boom. When the boom is working, the maximum stress of the boom appears in the contact area between the slider and the boom section, and these areas are prone to local crushing. Therefore, in order to meet the lightweight requirements and safety requirements, the reasonable design of the slider assembly is critical to improving the carrying capacity of the boom.

[0122] See also Figures 6 to 8 , Fig.12 and Fig.13 In some embodiments, the arm section further comprises a first slider assembly 7, which is mounted on the first arm section 1. Specifically, the first slider assembly 7 is mounted on the tail 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. Figure 7 and Fig.12 When the first arm section 1 is not extended relative to the second arm section 2, a first gap δ1 exists between the first slider 71 and the inner wall of the second arm section 2. Figure 7 and Fig.13 When the boom is loaded and the first boom section 1 is fully extended relative to the second boom section 2, the first slider 71 is completely in contact with the inner wall of the second boom section 2. Here, the load condition of the boom is set to, for example, 1.0 to 1.7 times the rated load of the boom, specifically, 1.5 times.

[0123] See also Figures 6 to 8 , Fig.12 and Fig.13, the first slider 71 includes a first gap portion 711 and a first fitting portion 712. The first fitting portion 712 is fixedly connected to or integrated with the first gap portion 711. The first gap portion 711 is fixed to the outer side of the top plate 32 of the first cover plate 3. When the first arm section 1 is not extended relative to the second arm section 2, there is a first gap δ1 between the first gap portion 711 and the inner wall of the second arm section 2. When the arm frame is loaded, and when the first arm section 1 is fully extended relative to the second arm section 2, the first gap portion 711 is fully fitted with the inner wall of the second arm section 2. The first fitting 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. Here, the load carried by the arm frame is set to, for example, 1.0 to 1.7 times the rated load of the arm frame, specifically, 1.5 times. If the load carried by the arm frame does not reach the set value, the state of the first gap portion 711 and the inner wall of the second arm section 2 is between the two states of being fully fitted and having the first gap δ1.

[0124] The shape of the side of the first gap portion 711 that fits with the top plate 32 is consistent with the shape of the outer wall of the top plate 32, and the two fit completely. The side surface of the first gap portion 711 away from the top plate 32 is used to contact the inner wall of the second arm section 2, and the surface is configured as a convex arc. In the width direction of the arm section, the end of the convex arc away from the first fitting portion 712 contacts the inner wall of the second arm section 2, and the rest of the convex arc has a first gap δ1 with the inner wall of the second arm section 2.

[0125] See also Figures 6 to 8 , Fig.12 and Fig.13 In some embodiments, in the width direction of the arm segment, the total width of the arm segment is w1, the lower limit of the first gap δ1 is: 0.0168×w1-2.64; the upper limit of the first gap δ1 is: 0.0336×w1-5.28. Since the first gap portion 711 is an outwardly convex arc, the gaps between the various regions of the arc and the inner wall of the second arm segment 2 are not equal, and the first gap δ1 refers to the maximum gap between the first gap portion 711 and the inner wall of the second arm segment 2.

[0126] See also Figures 6 to 8 , Fig.12 and Fig.13 In some embodiments, there are two first sliders 71, one of which is located at the corner between the top plate 32 and the first side plate 31 of the first cover plate 3, and the first fitting portion 712 of the first slider 71 is fixed to the first side plate 31 of the first cover plate 3. Another first slider 71 is located at the corner between 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.

[0127] The first slider 71 adopts the above-mentioned structure including the first gap portion 711 and the first fitting portion 712. On the one hand, the first fitting portions 712 of the two first sliders 71 cooperate with each other to limit the first arm section 1 in the width direction of the first arm section 1; on the other hand, the first gap portions 711 of the two first sliders 71 limit the first arm section 1 at two positions in the width direction of the arm section, so that the force on the first arm section 1 is more stable; on the other hand, the first slider 71 as a whole can be installed in place at one time so that the first gap portion 711 and the first fitting portion 712 can be installed in place, thereby reducing the number of sliders to be installed without reducing the function.

[0128] Continue to see Figures 6 to 8 , Fig.12 and Fig.13 In some embodiments, the first slider assembly 7 further includes a second slider 72 and a third slider 73. The second slider 72 is fixed to the outside of the flat plate 421 of the first arm section 1; the second slider 72 cooperates with the first gap portion 711 to limit the first arm section 1 in the height direction of the arm frame. There are two third sliders 73; one of the third sliders 73 is fixed to the bend of the first bending plate 422, and the other third slider 73 is fixed to the bend of the second bending plate 423; wherein the two third sliders 73 cooperate with each other to limit the first arm section 1 in both the height direction and the width direction of the arm frame.

[0129] See also Figures 9 to 13 In some embodiments, the arm section further comprises a second slider assembly 8, which is mounted on 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. Fig. 9 and Fig.12 When the first arm section 1 is not extended relative to the second arm section 2, a second gap δ2 exists between the fourth sliding block 81 and the outer wall of the first arm section 1. Figures 9 to 13 When the boom is loaded and the first boom section 1 is fully extended relative to the second boom section 2, the fourth slider 81 is completely in contact with the outer wall of the first boom section 1. Here, the load carried by the boom is set to, for example, 1.0 to 1.7 times the rated load of the boom, specifically, 1.5 times. If the load carried by the boom does not reach the set value, the state of the fourth slider 81 and the outer wall of the first boom section 1 is between the two states of completely in contact and having a second gap δ2.

[0130] Since the fourth sliding block 81 is an outwardly convex arc, the gaps between various regions of the arc and the outer wall of the first arm section 1 are not equal, and the second gap δ2 refers to the maximum gap between the fourth sliding block 81 and the outer wall of the first arm section 1 .

[0131] In some embodiments, the lower limit of the second gap δ2 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 w2.

[0132] See also Figures 9 to 13 In some embodiments, the second slider assembly 8 further includes a fifth slider 82. There are two fifth sliders 82, one of which is installed at the bending position of the first bending plate 422 of the second arm section 2, and the other fifth slider 82 is installed at the bending position of the second bending plate 423 of the second arm section 2.

[0133] The first arm section 1 and the second arm section 2 are nested, the first bending plate of the first arm section 1 corresponds to the first bending plate of the second arm section 2, and the second bending plate of the first arm section 1 corresponds to the second bending plate of the second arm section 2. When the boom structure is loaded, the cross section of the arm section changes as follows Fig.13 The deformation shown is small at the bend of the first boom section 1 and large at the flat section. The fifth slider 82 provided by the above technical solution is arranged at the corner of the cross section of the second boom section 2, which can reduce the number of sliders required for the boom frame, facilitate installation, and reduce the contact gap, thereby reducing the contact stress and improving the safety factor of the boom section.

[0134] See also Figures 9 to 13 When the first arm section 1 is not extended relative to the second arm section 2, a third gap δ3 exists between the fifth sliding block 82 and the outer wall of the first arm section 1. Figure 8 , Fig. 9 and Fig.13 , when the boom is loaded, and when the first boom section 1 is fully extended relative to the second boom section 2, the fifth slider 82 is completely in contact with the outer wall of the first boom section 1. Here, the load condition of the boom is set to, for example, 1.0 to 1.7 times the rated load of the boom, specifically, 1.5 times. After the first boom section 1 is extended, the first boom section 1 deforms under its own weight and load-bearing conditions. After the first boom section 1 is deformed, the fifth slider 82 installed on the second boom section 2 is completely in contact with the outer wall of the first boom section 1, and the third gap δ3 becomes 0, thereby increasing the contact area between the fifth slider 82 and the first boom section 1, reducing the stress on the first boom section 1, avoiding local crushing, and improving the safety factor of the boom.

[0135] The fifth slider 82 has an outwardly convex arc shape, and the gaps between the arc regions of the fifth slider 82 and the outer wall of the first arm section 1 are not equal. The third gap δ3 refers to the maximum gap between the fifth slider 82 and the outer wall of the first arm section 1 .

[0136] See also Fig. 9 and Fig.10The 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 as a convex arc to form a third gap δ3 between the second gap portion 821 and the first arm section 1. The surface of the second fitting portion 822 facing the first arm section 1 is flat. The second gap portion 821 is fixedly connected to one of the first bending plate 422 and the second bending plate 423. The second fitting portion 822 is fixedly connected to one of the third side plate 41 and the fourth side plate 43.

[0137] In some embodiments, there are two fifth sliders 82. The second gap portion 821 of one fifth slider 82 is fitted and fixedly connected to the first bent plate 422, and the second fitting portion 822 is fitted and fixedly connected to the third side plate 41. The second gap portion 821 of another fifth slider 82 is fitted and fixedly connected to the second bent plate 423, and the second fitting portion 822 is fitted and fixedly connected to the fourth side plate 43.

[0138] Among them, when the first arm section 1 is not extended relative to the second arm section 2, there is a third gap δ3 between the second gap portion 821 and the outer wall of the first arm section 1. When the boom is loaded, and when the first arm section 1 is fully extended relative to the second arm section 2, the second gap portion 821 is completely in contact with the outer wall of the first arm section 1. Here, the load condition carried by the boom is set to, for example, 1.0 to 1.7 times the rated load of the boom, specifically, 1.5 times. If the load is less than the set value, the state of the second gap portion 821 and the outer wall of the first arm section 1 is between the two states of being completely in contact and having the third gap δ3.

[0139] In some embodiments, the lower limit of the third gap δ3 is The upper limit of the third gap δ3 is The total width of the bottom plate 42 is w1, and the width of the flat plate 421 is w2.

[0140] For aerial work vehicles, the rated operating weight stipulated by the national standard is 200kg (2 adult males + small tools), and there is a slight overload phenomenon during actual operation. The special size design of the first gap δ1, the second gap δ2, and the third gap δ3 given in the article can ensure that when the rated load is 1.5 times and the boom is fully extended to the maximum operating range of 25m, the arc sliding surface of the corresponding arc slider is in full contact with the boom section, reducing the maximum contact stress of the boom section in the most dangerous working condition by 40%, thereby improving the safety of aerial work.

[0141] In some embodiments, the two fifth sliders 82 cooperate with each other to limit the first arm section 1 in both the width direction and the height direction of the boom. When the first arm section 1 is not extended, there is a gap between the two fifth sliders 82 and the first arm section 1 in the height direction; after the first arm section 1 is extended, due to the self-weight and load of the first arm section 1, after the first arm section 1 is deformed, the first arm section 1 and the two fifth sliders 82 are completely fitted in the height direction, thereby increasing the contact area between the first slider 71 and the first arm section 1, reducing the stress on the first arm section 1, and further improving the safety factor of the arm section. The positions of the two fifth sliders 82 in the width direction of the arm section are different, which also makes the force on the first arm section 1 in the width direction more balanced.

[0142] See also Figures 9 to 13 In some embodiments, the second slider assembly 8 further includes a sixth slider 83, and the number of the sixth slider 83 is two, one of which is fixed to the connection between the top plate 32 and the first side plate 31 of the first cover plate 3 of the second arm section 2, and the other is fixed to the connection between the top plate 32 and the second side plate 33 of the first cover plate 3 of the second arm section 2. The two sixth sliders 83 cooperate with the fourth slider 81 to limit the first arm section 1 in both the width direction and the height direction of the boom.

[0143] When the first arm section 1 is installed in place and not extended, the sixth slider 83 is completely fitted with the first arm section 1; at this time, the fourth slider 81 and the first arm section 1 have a second gap, and the fifth slider 82 and the first arm section 1 have a third gap. When the first arm section 1 is extended in place, it will deform, and the sixth slider 83 and the first arm section 1 are no longer in contact; at this time, the fourth slider 81 and the first arm section 1 are completely fitted, and the fifth slider 82 and the first arm section 1 are completely fitted.

[0144] It can be seen that the sixth slider 83 does not bear any load, and mainly serves to limit the first arm section 1. The sixth slider 83 adopts a block structure with an L-shaped cross section, so that the two sixth sliders 83 cooperate with each other in the width direction of the boom to limit the first arm section 1 in the width direction of the boom, so that the first arm section 1 does not shake in the width direction. In the height direction of the boom, the two sixth sliders 83 can cooperate with the fourth slider 81 and the fifth slider 82 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.

[0145] In some embodiments, the second slider assembly 8 is located downstream of the first slider assembly 7 in the extension direction of the first boom section 1. The maximum extension length of the first boom section 1 relative to the second boom section 2 is determined by the control cylinder of the first boom section 1 and the corresponding controller.

[0146] Under the limiting action of the first slider assembly 7 and the second slider assembly 8, when the first arm section 1 is fully retracted, the first arm section 1 and the second arm section 2 will not have any relative movement in any direction except the extension direction. In actual work, as the arm section extension distance increases, the contact pressure between the first arm section 1 and the first slider 71 of the first slider assembly 7, the fourth slider 81 and the fifth slider 82 of the second slider assembly 8 increases, the deformation of the cross section of the first arm section 1 increases, and the arc-shaped sliding surface fits more closely, resulting in an increase in the contact area between the first arm section 1 and the first slider 71, the fourth slider 81 and the fifth slider 82. Compared with sliders with traditional planar structures, the structure of the first slider 71 of the first slider assembly 7 and the fourth slider 81 and the fifth slider 82 of the second slider assembly 8 provided in the embodiment of the present invention can reduce the contact stress by more than 40%. When the first arm section 1 is retracted (small torque and small stress, which is a safe working condition), it has a smaller contact surface, such as Fig.12 shown; see Fig.13 When the first boom section 1 is extended (large torque and stress, which is a dangerous working condition), the cross section of the boom section is squeezed and deformed, and has a larger contact surface with the slider, which reduces the contact stress by more than 40% compared with the traditional plane slider, effectively improving the safety factor of the boom.

[0147] Take the boom including five boom sections as an example. The three boom sections in the middle are both inner and outer boom sections, so the three boom sections in the middle are provided with both the first slider assembly 7 and the second slider assembly 8. Specifically, the first slider assembly 7 is installed at the tail of the boom sections in the middle, and the second slider assembly 8 is installed at the head. The boom section located at the outermost side is only provided with the second slider assembly 8 at the head. The boom section located at the innermost side is only provided with the first slider assembly 7 at the tail. Of course, the boom sections can also include six or even seven boom sections. Each of the boom sections in the middle is also provided with the first slider assembly 7 and the second slider assembly 8 at the same time. The outermost boom section is only provided with the second slider assembly 8 at the head, and the innermost boom section is only provided with the first slider assembly 7 at the tail.

[0148] In the above technical solution, when the boom is fully retracted, the first boom section 1 and the second boom section 2 will not move relative to each other in any direction except in the extension direction. In actual operation, as the boom is extended further, the head of the first boom section 1 is pressed and depressed, the contact pressure between the first boom section 1 and the fourth slider 81 and the fifth slider 82 is greater, and the deformation of the cross section of the first boom section 1 is greater, so that the first boom section 1 fits the sliding surfaces of the fourth slider 81 and the fifth slider 82 more closely; the tail of the second boom section 2 is pressed and convex, and the deformed shape of the second boom section 2 fits the arc surface of the first slider 71 more closely, resulting in an increase in the contact area between the first slider 71, the fourth slider 81 and the fifth slider 82 and the first boom section 1 and the second boom section 2. Fig.12 and Fig.13, thereby reducing the contact stress between the first boom section 1 and the second boom section 2, and improving the safety of the boom structure. When the boom section of the traditional planar slider is loaded and deformed, the contact area becomes smaller and smaller, resulting in a sharp increase in the stress in the contact area. The technical solution of the embodiment of the present invention reduces the contact stress by more than 40% compared with the slider of the traditional planar structure.

[0149] In addition, for the boom of the aerial work vehicle, the area corresponding to the slider assembly is divided into an installation area and a movement area. The so-called installation area refers to the area where each slider of the first slider assembly 7 and the second slider assembly 8 is installed with the corresponding arm section.

[0150] For the first slider 71, the second slider 72, and the third slider 73 installed on the first arm section 1, the installation area refers to the surface of the first slider 71, the second slider 72, and the third slider 73 respectively fixedly connected to the first arm section 1; the movement area refers to the surface of the first slider 71, the second slider 72, and the third slider 73 respectively facing the second arm section 2.

[0151] For the fourth slider guide, the fifth slider 82 and the sixth slider 83 installed on the second arm section 2, the installation area is the surface of the fourth slider 81, the fifth slider 82 and the sixth slider 83 respectively fixedly connected to the second arm section 2; the movement area refers to the surface of the fourth slider 81, the fifth slider 82 and the sixth slider 83 respectively facing the first arm section 1.

[0152] After the slider is fixed, the installation area is fixed and its area is small. Strengthening the installation area will not significantly increase the weight of the boom section, nor will it affect the telescopic movement of the boom. The motion area is non-fixed and has a large area. Partially strengthening the motion area will affect the telescopic movement of the boom and significantly increase the weight of the boom section.

[0153] In the prior art, in order to increase the structural strength of the boom section, the adopted method is to strengthen the boom section in the installation area to improve the local strength and stiffness. Common strengthening forms include welding steel plates, welding vertical reinforcing ribs, adding steel pads, etc. Strengthening in this area will not affect the sliding of the boom section; and for the boom section in the slider movement area, there is no effective means to strengthen it except for the overall thickening of the boom section. The technical solution of the embodiment of the present invention creatively solves this problem. On the one hand, the first boom section and the second boom section are both processed with ultra-thin steel plates, that is, the wall thickness of each boom section is reduced as a whole, and then the strength and stiffness of the overall boom structure are guaranteed by designing a special boom section shape, and the local crushing problem caused by excessive stress in the boom section in the slider movement area is solved by designing a special structure of the first slider assembly 7 and the second slider assembly 8, thereby improving the reliability of the boom structure.

[0154] Fig.14Another implementation method of the arm is given. Fig.11 In the illustrated embodiment, the cross section of the first cover plate 3 is also approximately U-shaped, but the free end of the U-shape is configured to be convex. Fig.11 Another implementation method of the arm is given. Fig.14 In the illustrated embodiment, the free end of the second cover plate 4 is configured to be convex.

[0155] Specifically, in some embodiments, the free end of the first side plate 31 is configured to be convex, the free end of the third side plate 41 is configured to be convex, and the free end of the first side plate 31 and the free end of the third side plate 41 are assembled to form a first protrusion 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 assembled to form a second protrusion 10.

[0156] See also Fig.14 In some embodiments, the heights of the first protrusion 9 and the second protrusion 10 are equal, and are both 30 mm to 55 mm, such as 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, and 55 mm. The structures of the first protrusion 9 and the second protrusion 10 are equal, and the height of the first protrusion 9 refers to the CD distance.

[0157] The first protrusion 9 and the second protrusion 10 are used to replace the first inner recess 5 and the second inner recess 6, which can also protect the side of the boom section from buckling instability, thereby improving the ultimate load-bearing capacity of the boom section.

[0158] See also Fig.15 The embodiment of the present invention further provides a boom manufacturing method for manufacturing the boom described above. The boom manufacturing method comprises the following steps:

[0159] Step S100: bend the steel plate to form a first cover plate 3. The structure of the first cover plate 3 is as described above.

[0160] Step S200: bend the steel plate to form the second cover plate 4. The structure of the second cover plate 4 is as described above.

[0161] Step S300: welding the first cover plate 3 and the second cover plate 4 to form an arm section.

[0162] Step S400: nest multiple boom sections to form a boom.

[0163] In some embodiments, step S400 specifically includes the following steps: installing a first slider assembly 7 at the tail end of the first arm section 1 ; nesting the first arm section 1 and the second arm section 2 ; and installing a second slider assembly 8 at the head end of the second arm section 2 .

[0164] After the two arm sections are nested, the whole is used as the inner arm, i.e. the first arm section, and then an outer arm section is nested. Repeat the above steps until the arm sections are nested.

[0165] The arm bracket obtained by the above manufacturing method has the various beneficial effects introduced above.

[0166] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A boom, characterized in that: The invention comprises at least two nested arm sections, at least one of the arm sections comprising: A first cover plate (3) is constructed as an integral body, 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, a free end of the first side plate (31) away from the top plate (32) is constructed to be convex or concave, and a free end of the second side plate (33) away from the top plate (32) is also constructed to be convex or concave; and The second cover plate (4) is constructed as a whole, and the second cover plate (4) comprises a third side plate (41), a bottom plate (42) and a fourth side plate (43) which are arranged in sequence; the third side plate (41) and the fourth side plate (43) are arranged opposite to each other, and the free end of the third side plate (41) away from the bottom plate (42) is constructed to be convex or concave, and the free end of the fourth side plate (43) away from the bottom plate (42) is also constructed to be convex or concave; wherein the free end of the first side plate (31) is fixedly connected to the free end of the third side plate (41), and the free end of the second side plate (33) is fixedly connected to the free end of the fourth side plate (43), so that the first cover plate (3) and the second cover plate (4) form a closed contour; The thickness of the second cover plate (4) is greater than the thickness of the first cover plate (3); the first cover plate (3) and the second cover plate (4) are each formed by bending a whole plate.

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, and the free end of the first side plate (31) and the free end of the third side plate (41) are assembled to form a first inner concave portion (5); The free end of the second side plate (33) is configured to be concave, and the free end of the fourth side plate (43) is configured to be concave; the free end of the second side plate (33) and the free end of the fourth side plate (43) are assembled to form a second inner recess (6).

3. The boom according to claim 2, characterized in that: The first inner recess (5) and the second inner recess (6) have the same height, and are both between 30 mm and 55 mm.

4. The boom according to claim 1, characterized in that: The free end of the first side plate (31) is configured to be convex, the free end of the third side plate (41) is configured to be convex, and the free end of the first side plate (31) and the free end of the third side plate (41) are assembled to form a first protrusion (9); The free end of the second side plate (33) is configured to be convex, and the free end of the fourth side plate (43) is configured to be convex; the free end of the second side plate (33) and the free end of the fourth side plate (43) are assembled to form a second protruding portion (10).

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

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

7. The boom according to claim 1, characterized in that: The bottom plate (42) comprises: A flat plate (421) parallel to the top plate (32); A first bending plate (422) is configured to be bent, the first bending plate (422) is located on one side of the length direction of the flat plate (421), and the angle between the first bending plate (422) and the flat plate (421) is θ; the first bending plate (422) is fixedly connected to the first side plate (31); and The second bent plate (423) is constructed to be bent, the second bent plate (423) is located on the other side of the length direction of the flat plate (421), and the angle between the second bent plate (423) and the flat plate (421) is also θ; the second bent plate (423) is fixedly connected to the second side plate (33); Wherein, the angle θ is greater than 90° and less than 180°.

8. The boom according to claim 7, characterized in that: The θ is between 150° and 170°.

9. The boom according to claim 7, characterized in that: In the width direction of the arm section, the total width of the arm section is w1, and the width of the flat plate (421) is w2; Among them, 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 according to claim 1, characterized in that: In the width direction of the arm section, the total width of the arm section is w1, and the height of the arm section is h1; Among them, the lower limit value of h1 is: 1.64×w1-87.4; The upper limit value of h1 is: 2.01×w1-107.

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 inside the second arm section (2); the arm section further comprises: A first slider assembly (7) mounted on 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); Wherein, when the first arm section (1) is not extended relative to the second arm section (2), a first gap δ1 exists between the first slider (71) and the inner wall of the second arm section (2); when the arm frame is loaded and when the first arm section (1) is fully extended relative to the second arm section (2), the first slider (71) is fully fitted with 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 δ1 is: 0.0168×w1-2.64; the upper limit of the first gap δ1 is: 0.0336×w1-5.

28.

13. The boom according to claim 11, characterized in that: The first sliding block (71) comprises: a first gap portion (711) fixed to the outer side of the top plate (32) of the first cover plate (3); wherein, when the first arm section (1) is not extended relative to the second arm section (2), a first gap δ1 exists between the first gap portion (711) and the inner wall of the second arm section (2); when the arm frame is loaded and the first arm section (1) is fully extended relative to the second arm section (2), the first gap portion (711) is fully fitted with the inner wall of the second arm section (2); and The first fitting portion (712) is fixedly connected to or integral with the first gap portion (711); the first fitting 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 portion (711) facing the second arm section (2) is constructed as an outwardly convex arc.

15. The boom according to claim 13, characterized in that: The first slider assembly (7) further comprises: a second sliding block (72) fixed to the outside of the flat plate (421) of the first arm section (1); the second sliding block (72) cooperates with the first gap portion (711) to limit the first arm section (1) in the height direction of the arm frame; and There are two third sliders (73); one of the third sliders (73) is fixed at the bending position of the first bending plate (422), and the other third slider (73) is fixed at the bending position of the second bending plate (423); wherein the two third sliders (73) cooperate with each other to limit the first arm section (1) in both the height direction and the width direction of the arm frame.

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

17. The boom according to claim 11, characterized in that: The arm section also includes: A second slider assembly (8) mounted on 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); Wherein, when the first arm section (1) is not extended relative to the second arm section (2), a second gap δ2 exists between the fourth slider (81) and the outer wall of the first arm section (1); when the arm frame is loaded and when the first arm section (1) is fully extended relative to the second arm section (2), the fourth slider (81) is fully fitted with the outer wall of the first arm section (1).

18. The boom according to claim 17, characterized in that: The lower limit of the second gap δ2 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 w2.

19. The boom according to claim 17, characterized in that: The second slider assembly (8) further comprises: There are two fifth sliders (82), one of which is installed at the bending part of the first bending plate (422), and the other is installed at the bending part of the second bending plate (423); when the first arm section (1) is not extended relative to the second arm section (2), a third gap δ3 exists between the fifth slider (82) and the outer wall of the first arm section (1); when the arm frame is loaded and when the first arm section (1) is fully extended relative to the second arm section (2), the fifth slider (82) is fully fitted with the outer wall of the first arm section (1).

20. The boom according to claim 19, characterized in that: The lower limit of the third gap δ3 is The upper limit of the third gap δ3 is The total width of the bottom plate (42) is w1, and the width of the flat plate (421) is w2.

21. The boom according to claim 19, characterized in that: The fifth slider (82) comprises: a second gap portion (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), a third gap δ3 exists between the second gap portion (821) and the outer wall of the first arm section (1); when the arm frame 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 fitted with the outer wall of the first arm section (1); and The second fitting portion (822) is fixedly connected to or integral with the second gap portion (821), and is fixed to the 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 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 frame.

23. The boom according to claim 19, characterized in that: The second slider assembly (8) further comprises: There are two sixth sliders (83), one of which is fixed at the connection between the top plate (32) and the first side plate (31) of the first cover plate (3) of the second arm section (2), and the other is fixed at the connection between the top plate (32) and the second side plate (33) of the first cover plate (3) of the second arm section (2); the two sixth sliders (83) cooperate with the fourth slider (81) to limit the first arm section (1) in both the width direction and the height direction of the arm frame.

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

25. An aerial work vehicle, characterized in that: It comprises the arm support described in any one of claims 1 to 24.

26. A method for manufacturing a boom, characterized in that: The following steps are involved: 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 a boom section; Multiple boom sections are nested to form a boom.

27. The boom manufacturing method according to claim 26, characterized in that: The nesting of multiple boom sections specifically includes the following steps: Installing a first slider assembly at the tail end of the first boom section; Nesting the first arm section and the second arm section; A second slider assembly is installed at the head end of the second boom section.

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