Telescopic boom and crane with same
By designing a symmetrical variable box group and support plate structure on the telescopic arm, the problem of uneven stress distribution is solved, and the load-bearing capacity and working reliability of the telescopic arm are improved.
Patent Information
- Application Number
- CN202411893471.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-03-21
AI Technical Summary
The stress distribution on the telescopic arm is uneven and the local stress is too large, resulting in damage to the telescopic arm and affecting the working reliability of the crane.
A telescopic arm is designed, including a basic arm, a support plate and a symmetrically arranged buoy box set. The first variable box extends axially along the basic arm, the second variable box is arranged inclined, one end of the first variable box stops from the support plate, the other end is connected to the variable cylinder, one end of the second variable box stops from the support plate, and the other end is against the side of the first variable box. This design avoids the formation of sharp corner structures and improves the stability and bearing capacity of the buckle set.
Through this design, stress is evenly distributed in various areas of the telescopic arm, reducing the probability of stress concentration, and improving the load-bearing capacity and working reliability of the telescopic arm.
Smart Images
Figure CN119660589A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of cranes, and in particular to a telescopic arm and a crane having the same. Background Art
[0002] The crane in the related technology usually has a luffing cylinder connected to the telescopic arm, and the telescopic arm is equipped with a mounting plate for connecting with the luffing cylinder. The mounting plate and the luffing cylinder can be connected by a pin shaft, and the luffing cylinder and the load are transmitted to the telescopic arm through the pin shaft and the mounting plate. The contact between the mounting plate and the telescopic arm will form a sharp-angle structure, resulting in abnormally large stress at the sharp corner, resulting in uneven stress distribution on the telescopic arm, which may cause damage to the telescopic arm and affect the working reliability of the crane. Summary of the invention
[0003] In view of this, the present invention provides a telescopic arm and a crane having the same, so as to solve the problems of uneven stress distribution and excessive local stress on the telescopic arm.
[0004] In the first aspect, the present invention provides a telescopic arm, comprising: a basic arm; a support plate, which is arranged on the outer peripheral surface of the basic arm and extends along the circumference of the basic arm; two amplitude change box groups, which are symmetrically arranged on both sides of the basic arm, and the amplitude change box group comprises a first amplitude change box and a second amplitude change box, the first amplitude change box and the second amplitude change box are both arranged on the outer peripheral surface of the basic arm, the first amplitude change box extends along the axial direction of the basic arm, and the second amplitude change box is inclined relative to the axial direction of the basic arm, one end of the first amplitude change box stops at the support plate, and the other end is used to connect to the amplitude change cylinder, one end of the second amplitude change box stops at the support plate, and the other end stops at the side of the first amplitude change box.
[0005] Beneficial effects: By setting up the first luffing box, the luffing cylinder and its load can be transferred to the support plate, and the connection between the first luffing box and the support plate will not form a sharp angle structure, which improves the stability of the luffing box group, increases the load-bearing capacity of the luffing box group, and makes the luffing box group relatively light. By setting up the second luffing box, it can play the role of supporting the first luffing box from the side of the first luffing box. The pressure on a part of the first luffing box can be transferred to the support plate through the second luffing box, reducing the stress at the connection between the first luffing box and the support plate, reducing the probability of stress concentration, and distributing the force more evenly to each area of the telescopic arm, increasing the load-bearing capacity of the luffing box group, and then increasing the load-bearing capacity of the telescopic arm.
[0006] In an optional embodiment, the second amplitude transformer boxes of two adjacent amplitude transformer boxes groups are located between the two first amplitude transformer boxes.
[0007] Beneficial effect: The space occupied by two adjacent luffing box groups in the circumferential direction of the telescopic arm is small, which is beneficial to improving the space utilization rate of the telescopic arm.
[0008] In an optional embodiment, the telescopic arm further includes: a third amplitude change box connected between two adjacent first amplitude change boxes and located on a side of the second amplitude change box away from the support plate, and the third amplitude change box is spaced apart from the basic arm.
[0009] Beneficial effects: The third luffing box can increase the path between two adjacent first luffing boxes and limit the relative position between two adjacent first luffing boxes. The third luffing box is not connected to the basic arm, which can prevent the formation of a rigidity mutation cross section on the basic arm, thereby improving the bending moment resistance of the telescopic arm.
[0010] In an optional embodiment, the second amplitude change box includes: a first inclined plate, which is provided on the outer peripheral surface of the basic arm and is inclined relative to the axial direction of the basic arm, one end of the first inclined plate abuts against the support plate and the other end abuts against the side surface of the first amplitude change box; a second inclined plate, which is provided on the outer peripheral surface of the basic arm and is inclined relative to the axial direction of the basic arm, the second inclined plate is spaced apart from the first inclined plate and is located between the first inclined plate and the support plate, one end of the second inclined plate abuts against the support plate and the other end abuts against the side surface of the first amplitude change box; wherein the spacing between the first inclined plate and the second inclined plate gradually increases in the direction away from the support plate.
[0011] Beneficial effects: The first inclined plate and the second inclined plate can support the first amplitude-changing box, and transfer the stress of the first amplitude-changing box to the supporting plate and the basic arm, which can increase the force transmission path of the first amplitude-changing box, and is beneficial to evenly transfer the stress on the first amplitude-changing box to various areas of the telescopic arm, thereby improving the force uniformity of the telescopic arm and reducing stress concentration and damage on the first amplitude-changing box.
[0012] In an optional embodiment, the second amplitude change box also includes: a first cover plate, connected to the first inclined plate, the second inclined plate and the support plate, the first cover plate is spaced apart from the basic arm; a second cover plate, connected to the first inclined plate, the first amplitude change box and the support plate, the second cover plate is spaced apart from the basic arm.
[0013] Beneficial effect: It can prevent dust and other impurities from entering between the second luffing boxes, slow down the rate at which the second luffing boxes are corroded and damaged, and the second luffing boxes will form a space that can buffer and absorb external forces, thereby improving the uniformity of stress distribution on the telescopic arm.
[0014] In an optional embodiment, the first amplitude change box includes: a first vertical plate, which is provided on the outer peripheral surface of the basic arm and extends along the axial direction of the basic arm, one end of the first vertical plate is connected to the support plate, and the other end is used to connect to the amplitude change cylinder, and the side surface of the first vertical plate is connected to the first inclined plate and the second inclined plate; a second vertical plate, which is provided on the outer peripheral surface of the basic arm and extends along the axial direction of the basic arm, the first vertical plate and the second vertical plate are spaced apart along the circumferential direction of the basic arm, one end of the second vertical plate is connected to the support plate, and the other end is used to connect to the amplitude change cylinder a first horizontal plate, which is arranged on the outer peripheral surface of the basic arm and extends along the circumferential direction of the basic arm, the first horizontal plate is connected to the first vertical plate and the second vertical plate, and the first horizontal plate and the first inclined plate are connected to one end of the first vertical plate and are arranged correspondingly; a second horizontal plate, which is arranged on the outer peripheral surface of the basic arm and extends along the circumferential direction of the basic arm, the second horizontal plate is connected to the first vertical plate and the second vertical plate, the first horizontal plate and the second horizontal plate are arranged at intervals along the axial direction of the basic arm, and the second horizontal plate and the second inclined plate are connected to one end of the first vertical plate and are arranged correspondingly.
[0015] Beneficial effects: The first horizontal plate and the second horizontal plate can define the relative position between the first vertical plate and the second vertical plate, ensuring the relative position between the first vertical plate and the second vertical plate is reliable. The first horizontal plate establishes a fast force transmission channel between the first inclined plate and the second vertical plate, and the second horizontal plate establishes a fast force transmission channel between the second inclined plate and the second vertical plate, which can improve the force transmission efficiency between the first luffing box and the second luffing box, and is conducive to improving the force uniformity of the telescopic arm.
[0016] In an optional embodiment, the first amplitude change box also includes: a third vertical plate, which is provided on the outer peripheral surface of the basic arm and extends along the axial direction of the basic arm, the third vertical plate is located on the side of the second vertical plate facing away from the first vertical plate, the third vertical plate and the second vertical plate are spaced apart along the circumference of the basic arm, one end of the third vertical plate is connected to the support plate, and the other end is used to connect to the amplitude change cylinder; a third transverse plate, which is connected between the second vertical plate and the third vertical plate and extends along the circumference of the basic arm, and the third transverse plate is provided on the side of the first transverse plate facing away from the support plate.
[0017] Beneficial effects: The third vertical plate can increase the connection area between the first luffing box and the luffing cylinder, improve the connection reliability between the first luffing box and the luffing cylinder, and add a force transmission path, reducing the probability of damage to each vertical plate. The third horizontal plate can limit the relative position between the third vertical plate and the second vertical plate, ensuring the relative position between the third vertical plate and the second vertical plate is reliable.
[0018] In an optional embodiment, the second horizontal plate is connected to one end of the first vertical plate toward the support plate, one end of the second vertical plate toward the support plate, and one end of the third vertical plate toward the support plate; the first amplitude change box also includes: a fourth vertical plate, which is arranged on the outer peripheral surface of the basic arm and extends along the circumference of the basic arm, the fourth vertical plate is connected between the second horizontal plate and the support plate, and is arranged corresponding to the first vertical plate; a fifth vertical plate, which is arranged on the outer peripheral surface of the basic arm and extends along the circumference of the basic arm, the fifth vertical plate is connected between the second horizontal plate and the support plate, and is arranged corresponding to the second vertical plate.
[0019] Beneficial effects: The second horizontal plate can fix the relative positions of the first vertical plate, the second vertical plate and the third vertical plate. The fourth vertical plate can increase the force transmission efficiency between the first vertical plate and the support plate, and the fifth vertical plate can increase the force transmission efficiency between the second vertical plate and the support plate, thereby ensuring the force transmission efficiency between the variable amplitude cylinder and the support plate, making the stress distribution on the telescopic arm more uniform and reducing the probability of stress concentration.
[0020] In an optional embodiment, the telescopic arm also includes at least one structure: a first sealing plate, connected to the first vertical plate, the second vertical plate and the first horizontal plate; a second sealing plate, connected to the first vertical plate, the second vertical plate, the first horizontal plate and the second horizontal plate; a third sealing plate, connected to the second vertical plate, the third vertical plate, the second horizontal plate and the third horizontal plate; a fourth sealing plate, connected to the fourth vertical plate, the fifth vertical plate, the second horizontal plate and the support plate; a fifth sealing plate and a sixth sealing plate, the fifth sealing plate being connected to the fifth vertical plate, the second horizontal plate and the support plate, the sixth sealing plate being connected to the fifth sealing plate, the second horizontal plate, the support plate and the basic arm, and the sixth sealing plate being arranged corresponding to the third vertical plate.
[0021] Beneficial effects: The probability of dust accumulation in the first amplitude variation box can be reduced, and a space is formed in the first amplitude variation box for buffering energy absorption and improving the uniformity of stress distribution.
[0022] In an optional embodiment, the telescopic arm also includes: a first anti-compression buckling reinforcement rib, which is provided on the outer peripheral surface of the basic arm and extends along the axial direction of the basic arm, the first anti-compression buckling reinforcement rib is connected to the side of the support plate facing away from the amplitude variation box group, and is corresponding to the first amplitude variation box; a second anti-compression buckling reinforcement rib is provided on the outer peripheral surface of the basic arm and extends along the axial direction of the basic arm, the second anti-compression buckling reinforcement rib is connected to the side of the support plate facing away from the amplitude variation box group, and is corresponding to the second amplitude variation box.
[0023] Beneficial effect: It can support the support plate and prevent the support plate from being deformed due to stress.
[0024] In an optional embodiment, the second anti-compression buckling reinforcement rib extends from one end of the support plate to the arm head of the basic arm; and / or, the length of the first anti-compression buckling reinforcement rib is L1, the length of the second anti-compression buckling reinforcement rib is L2, 1.5≤L2 / L1≤2; and / or, the angle between the central axis of the second anti-compression buckling reinforcement rib and the first inclined plate is R1, the angle between the central axis of the second anti-compression buckling reinforcement rib and the second inclined plate is R2, R1<R2.
[0025] Beneficial effect: The supporting effect of the first anti-compression buckling reinforcement rib and the second anti-compression buckling reinforcement rib can be increased.
[0026] In a second aspect, the present invention further provides a crane, comprising: the telescopic arm described in the first aspect; and a luffing cylinder connected to the first luffing box.
[0027] Beneficial effect: The crane of the embodiment of the present invention, utilizing the telescopic arm described in the first aspect, has the advantage of uniform stress distribution and effectively avoids local stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0029] Figure 1 It is a structural schematic diagram of a telescopic arm in the related art;
[0030] Figure 2 It is a schematic structural diagram of a telescopic arm according to an embodiment of the present invention;
[0031] Figure 3 for Figure 2 A partial enlarged view of the middle C area;
[0032] Figure 4 It is one of the partial schematic diagrams of the telescopic arm of the embodiment of the present invention;
[0033] Figure 5 This is a second partial schematic diagram of the telescopic arm of an embodiment of the present invention;
[0034] Figure 6 2 is a cross-sectional view of a telescopic arm according to an embodiment of the present invention.
[0035] Description of reference numerals:
[0036] 1. Telescopic arm;
[0037] 100, basic arm;
[0038] 200, support plate;
[0039] 300, luffing box group; 310, first luffing box; 311, first vertical plate; 312, second vertical plate; 313, first horizontal plate; 314, second horizontal plate; 315, third vertical plate; 316, third horizontal plate; 317, fourth vertical plate; 318, fifth vertical plate; 320, second luffing box; 321, first inclined plate; 322, second inclined plate; 323, first cover plate; 324, second cover plate; 330, first closing plate; 340, second closing plate; 350, third closing plate; 360, fourth closing plate; 370, fifth closing plate; 380, sixth closing plate;
[0040] 400, the third luffing box; 500, the first anti-compression buckling reinforcement rib; 600, the second anti-compression buckling reinforcement rib. DETAILED DESCRIPTION
[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.
[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0043] In the description of the present invention, "plurality" means two or more. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0045] Cranes in related art (e.g. mobile cranes), such as Figure 1 As shown, the telescopic arm includes a basic arm 10, on which a cover plate 21, a side plate 22 and a wrapping plate 23 are provided. The cover plate 21 and the side plate 22 are connected to form a box body, which has a pin shaft accommodating portion, which is connected to the luffing cylinder through a pin shaft, and the load of the luffing cylinder is transmitted to the basic arm 10 through the pin shaft accommodating portion, and the cover plate 21 and the side plate 22 can be two, and the two cover plates 21 and the two side plates 22 are two boxes. The two boxes are arranged at intervals along the circumference of the basic arm 10, and the two boxes are connected by the wrapping plate 23.
[0046] Figure 1 In the embodiment, the cover plate 21 and the side plate 22 form a pointed structure in the A region, and the stress in the A region is concentrated. In order to avoid excessive stress in the A region, the load that the cover plate 21 and the side plate 22 can bear as a whole is limited. In particular, when there are external factors that generate torque angles, such as wind or the inclination of the crane, torque angles will be generated. As the torque angle increases, the telescopic arm will bear more additional loads, and the stress in the A region will increase accordingly, thereby further limiting the upper limit of the load that the cover plate 21 and the side plate 22 can bear as a whole.
[0047] In addition, the stress concentration in the B region is also relatively concentrated, which will also limit the load that the cover plate 21 and the side plate 22 can bear as a whole.
[0048] Combine the following Figures 2 to 6 , describing an embodiment of the present invention.
[0049] According to an embodiment of the present invention, on one hand, a telescopic boom 1 is provided. The telescopic boom 1 includes a base boom 100 , a support plate 200 and a plurality of luffing box groups 300 .
[0050] The support plate 200 is arranged on the outer circumference of the basic arm 100 and extends along the circumference of the basic arm 100. A plurality of amplitude change box groups 300 are arranged at intervals along the circumference of the basic arm 100. For example, there are two amplitude change box groups 300, and the two amplitude change box groups 300 are symmetrically arranged on both sides of the basic arm 100. The amplitude change box group 300 includes a first amplitude change box 310 and a second amplitude change box 320. The first amplitude change box 310 and the second amplitude change box 320 are both arranged on the outer circumference of the basic arm 100. The first amplitude change box 310 extends along the axial direction of the basic arm 100. The second amplitude change box 320 is arranged obliquely relative to the axial direction of the basic arm 100. One end of the first amplitude change box 310 stops at the support plate 200, and the other end of the first amplitude change box 310 is used to connect with the amplitude change cylinder (not shown in the figure). One end of the second amplitude change box 320 stops at the support plate 200 and the other end stops at the side of the first amplitude change box 310.
[0051] Specifically, the luffing cylinder may be connected to the first luffing boxes 310 of two adjacent luffing box groups 300, wherein the luffing cylinder and the first luffing boxes 310 may be connected via a pin shaft, and the luffing cylinder may drive the telescopic arm 1 to perform telescopic movement.
[0052] By providing the first luffing box 310, the luffing cylinder and its load can be transferred to the support plate 200, and no sharp-angle structure is formed at the connection between the first luffing box 310 and the support plate 200, thereby avoiding excessive local pressure, improving the stability of the luffing box group 300, increasing the load-bearing capacity of the luffing box group 300, and making the luffing box group 300 relatively light.
[0053] The second amplitude variation box 320 is provided to support the first amplitude variation box 310 from the side of the first amplitude variation box 310. A part of the pressure on the first amplitude variation box 310 can be transmitted to the support plate 200 through the second amplitude variation box 320, thereby reducing the stress at the connection between the first amplitude variation box 310 and the support plate 200, reducing the probability of stress concentration, and distributing the force more evenly in various areas of the telescopic arm 1, thereby increasing the load-bearing capacity of the amplitude variation box group 300, thereby increasing the load-bearing capacity of the telescopic arm 1.
[0054] like Figure 2-Figure 4 As shown, in the technical solution of this embodiment, the second luffing boxes 320 of two adjacent luffing box groups 300 are located between the two first luffing boxes 310. In this way, the space occupied by the two adjacent luffing box groups 300 in the circumferential direction of the telescopic arm 1 is small, which is conducive to improving the space utilization of the telescopic arm 1, and can reduce the size of the support plate 200, save materials, and reduce costs and weight.
[0055] In some embodiments not shown, the second amplitude box 320 can be connected to the opposite side surfaces of the first amplitude box 310 along the circumference of the basic arm 100, that is, the amplitude box group 300 includes at least two second amplitude boxes 320, and the two second amplitude boxes 320 are arranged on the opposite side surfaces of the first amplitude box 310 along the circumference of the basic arm 100. The stress on the first amplitude box 310 can be transmitted to the support plate 200 and the rest of the telescopic arm 1 through the two amplitude boxes, thereby further improving the uniformity of the stress distribution.
[0056] like Figure 3-Figure 4 , Figure 6 As shown, in the technical solution of this embodiment, the telescopic arm 1 also includes a third amplitude box 400, which is connected between two adjacent first amplitude boxes 310, and the third amplitude box 400 is located on the side of the second amplitude box 320 away from the support plate 200, and the third amplitude box 400 is spaced apart from the basic arm 100.
[0057] For example, the third amplitude transformer box 400 has a cavity, and the cavity can pass through both ends of the third amplitude transformer box 400, and both ends of the third amplitude transformer box 400 are respectively connected to the first amplitude transformer box 310, so that the opening of the cavity is closed by the first amplitude transformer box 310, so that the cavity is formed into a closed cavity; or the cavity does not pass through both ends of the third amplitude transformer box 400, and the third amplitude transformer box 400 directly defines a closed cavity. In addition, the third amplitude transformer box 400 is made of a metal material with relatively high rigidity.
[0058] By setting the third amplitude change box 400, the path between two adjacent first amplitude change boxes 310 can be increased, the relative position between two adjacent first amplitude change boxes 310 can be limited, and the probability of the relative position between two adjacent first amplitude change boxes 310 can be reduced, which is beneficial to improving the connection reliability between the first amplitude change box 310 and the amplitude change cylinder.
[0059] In addition, the third amplitude-changing box 400 is spaced apart from the basic arm 100, that is, the third amplitude-changing box 400 is not connected to the basic arm 100, which can prevent a cross section with a sudden rigidity change from being formed on the basic arm 100 (for example, the lower shell of the telescopic arm 1). Generally speaking, the rigidity of the third amplitude-changing box 400 is greater than that of the lower shell of the telescopic arm 1, thereby avoiding a large difference in deformation between the third amplitude-changing box 400 and the basic arm 100 and causing stress anomalies, thereby improving the bending moment resistance of the telescopic arm 1.
[0060] like Figure 2-Figure 5 As shown, in the technical solution of this embodiment, the second amplitude change box 320 includes a first inclined plate 321 and a second inclined plate 322 .
[0061] The first inclined plate 321 is provided on the outer peripheral surface of the basic arm 100, and the first inclined plate 321 is inclined relative to the axial direction of the basic arm 100, one end of the first inclined plate 321 abuts against the support plate 200 and the other end abuts against the side of the first amplitude change box 310. The second inclined plate 322 is provided on the outer peripheral surface of the basic arm 100, and the second inclined plate 322 is inclined relative to the axial direction of the basic arm 100, the second inclined plate 322 is spaced apart from the first inclined plate 321, one end of the second inclined plate 322 abuts against the support plate 200 and the other end abuts against the side of the first amplitude change box 310; wherein the spacing between the first inclined plate 321 and the second inclined plate 322 gradually increases in the direction away from the support plate 200.
[0062] The first inclined plate 321 and the second inclined plate 322 can support the first amplitude change box 310 and transfer the stress of the first amplitude change box 310 to the support plate 200 and the basic arm 100, which can increase the force transmission path of the first amplitude change box 310, and is beneficial to uniformly transfer the stress on the first amplitude change box 310 to various areas of the telescopic arm 1, thereby improving the force uniformity of the telescopic arm 1 and reducing stress concentration and damage on the first amplitude change box 310.
[0063] The first inclined section has a first connecting end and a first supporting end, the second inclined section has a second connecting end and a second supporting end, the distance between the first connecting end and the second connecting end is greater than the distance between the first supporting end and the second supporting end, the second connecting end is located between the first connecting end and the supporting plate 200, and the second supporting section is located between the first supporting section and the first amplitude change box 310.
[0064] In this way, the second amplitude box 320 covers a larger size of the first amplitude box 310, which can more effectively transfer the stress of each area on the first amplitude box 310, and provide a better support effect for the first amplitude box 310. The size of the second amplitude box 320 covering the support plate 200 is reduced, and space can be reserved. The telescopic arm 1 can arrange other structures near the support plate 200, thereby improving the space utilization of the telescopic arm 1.
[0065] like Figure 3-Figure 5 As shown, in the technical solution of this embodiment, the second amplitude change box 320 further includes a first cover plate 323 and a second cover plate 324, the first cover plate 323 is connected to the first inclined plate 321, the second inclined plate 322 and the support plate 200, and the first cover plate 323 is spaced apart from the basic arm 100. The second cover plate 324 is connected to the first inclined plate 321, the first amplitude change box 310 and the support plate 200, and the second cover plate 324 is spaced apart from the basic arm 100.
[0066] By providing the first cover plate 323, impurities such as dust can be prevented from entering between the first inclined plate 321 and the second inclined plate 322, the dust accumulation on the telescopic arm 1 is reduced, the rate at which the second amplitude change box 320 is corroded and damaged is slowed down, and the service life is extended. In addition, a space is formed between the basic arm 100, the first cover plate 323, the first inclined plate 321, the second inclined plate 322 and the support plate 200, and the space can play a role in buffering and absorbing external forces, thereby improving the uniformity of stress distribution on the telescopic arm 1;
[0067] By setting the second cover plate 324, impurities such as dust can be prevented from entering between the second inclined plate 322 and the first amplitude change box 310, thereby reducing the dust accumulation on the telescopic arm 1, slowing down the rate at which the first amplitude change box 310 and the second amplitude change box 320 are corroded and damaged, and extending the service life. In addition, a space is formed between the basic arm 100, the second cover plate 324, the second inclined plate 322 and the support plate 200, which can buffer and absorb external forces, thereby improving the uniformity of stress distribution on the telescopic arm 1.
[0068] like Figure 3-Figure 5 As shown, in the technical solution of this embodiment, the first amplitude change box 310 includes a first vertical plate 311 , a second vertical plate 312 , a first horizontal plate 313 and a second horizontal plate 314 .
[0069] The first vertical plate 311 is provided on the outer peripheral surface of the basic arm 100 and extends along the axial direction of the basic arm 100. One end of the first vertical plate 311 is connected to the support plate 200, and the other end of the first vertical plate 311 is used to connect to the luffing cylinder. The side surface of the first vertical plate 311 is connected to the first inclined plate 321 and the second inclined plate 322. The second vertical plate 312 is provided on the outer peripheral surface of the basic arm 100 and extends along the axial direction of the basic arm 100. The first vertical plate 311 and the second vertical plate 312 are arranged at intervals along the circumferential direction of the basic arm 100. One end of the second vertical plate 312 is connected to the support plate 200, and the other end is used to connect to the luffing cylinder.
[0070] The first transverse plate 313 is provided on the outer circumference of the basic arm 100, and the first transverse plate 313 extends along the circumference of the basic arm 100. The first transverse plate 313 is connected to the first vertical plate 311 and the second vertical plate 312, and is provided corresponding to the end of the first inclined plate 321 connected to the first vertical plate 311. The second transverse plate 314 is provided on the outer circumference of the basic arm 100, and the second transverse plate 314 extends along the circumference of the basic arm 100. The second transverse plate 314 is connected to the first vertical plate 311 and the second vertical plate 312, and the second transverse plate 314 is provided corresponding to the end of the second inclined plate 322 connected to the first vertical plate 311.
[0071] By providing the first vertical plate 311 and the second vertical plate 312, the connection area between the first amplitude box 310 and the amplitude cylinder can be increased, and the connection reliability between the first amplitude box 310 and the amplitude cylinder can be improved. In addition, the external force applied by the amplitude cylinder to the first amplitude box 310 can be transmitted to the support plate 200 through two paths, which reduces the stress level of each vertical plate, reduces the probability of damage to each vertical plate, and increases the upper limit of the external force that the first amplitude box 310 can bear.
[0072] By setting the first transverse plate 313 and the second transverse plate 314, the relative position between the first vertical plate 311 and the second vertical plate 312 can be limited, and the relative position between the first vertical plate 311 and the second vertical plate 312 can be ensured to be reliable. In addition, since the first transverse plate 313 is correspondingly arranged with the first inclined plate 321, and the second transverse plate 314 is correspondingly arranged with the second inclined plate 322, the first transverse plate 313 establishes a fast force transmission channel between the first inclined plate 321 and the second vertical plate 312, and the second transverse plate 314 establishes a fast force transmission channel between the second inclined plate 322 and the second vertical plate 312, which can improve the force transmission efficiency between the first amplitude change box 310 and the second amplitude change box 320, and is conducive to improving the force uniformity of the telescopic arm 1.
[0073] like Figure 3-Figure 5 As shown, in the technical solution of this embodiment, the first amplitude change box 310 also includes a third vertical plate 315 and a third horizontal plate 316 .
[0074] The third vertical plate 315 is arranged on the outer circumferential surface of the basic arm 100, and the third vertical plate 315 extends along the axial direction of the basic arm 100. The third vertical plate 315 is located on the side of the second vertical plate 312 facing away from the first vertical plate 311. The third vertical plate 315 and the second vertical plate 312 are arranged at intervals along the circumferential direction of the basic arm 100. One end of the third vertical plate 315 is connected to the support plate 200, and the other end is used to connect to the amplitude cylinder. The third transverse plate 316 is connected between the second vertical plate 312 and the third vertical plate 315, and the third transverse plate 316 is arranged on the side of the first transverse plate 313 facing away from the support plate 200.
[0075] By providing the third vertical plate 315, the connection area between the first amplitude changing box 310 and the amplitude changing cylinder can be increased, and the connection reliability between the first amplitude changing box 310 and the amplitude changing cylinder can be improved. In addition, the external force applied by the amplitude changing cylinder to the first amplitude changing box 310 adds a force transmission path, reduces the force level of each vertical plate, reduces the probability of damage to each vertical plate, and increases the upper limit of the external force that the first amplitude changing box 310 can bear.
[0076] Furthermore, by providing the third transverse plate 316 , the relative position between the third vertical plate 315 and the second vertical plate 312 can be limited, thereby ensuring that the relative position between the third vertical plate 315 and the second vertical plate 312 is reliable. Furthermore, the third transverse plate 316 can be provided corresponding to the third amplitude box 400 .
[0077] like Figure 1-Figure 3 As shown, in the technical solution of this embodiment, the second horizontal plate 314 is connected to one end of the first vertical plate 311 facing the support plate 200 , one end of the second vertical plate 312 facing the support plate 200 , and one end of the third vertical plate 315 facing the support plate 200 .
[0078] The first luffing box 310 further includes a fourth vertical plate 317 and a fifth vertical plate 318. The fourth vertical plate 317 is disposed on the outer peripheral surface of the basic arm 100 and extends along the circumference of the basic arm 100. The fourth vertical plate 317 is connected between the third transverse plate 316 and the support plate 200, and the fourth vertical plate 317 is disposed corresponding to the first vertical plate 311. The fifth vertical plate 318 is disposed on the outer peripheral surface of the basic arm 100 and extends along the circumference of the basic arm 100. The fifth vertical plate 318 is connected between the third transverse plate 316 and the support plate 200, and the fifth vertical plate 318 is disposed corresponding to the second vertical plate 312.
[0079] The second horizontal plate 314 can fix the relative positions of the first vertical plate 311, the second vertical plate 312 and the third vertical plate 315. Combined with the first horizontal plate 313 fixing the positions of the first vertical plate 311 and the second vertical plate 312, and the third horizontal plate 316 fixing the relative positions of the second vertical plate 312 and the third vertical plate 315, the structural strength of the first amplitude change box 310 is greatly increased.
[0080] In addition, the fourth vertical plate 317 can increase the force transmission efficiency between the first vertical plate 311 and the support plate 200, and the fifth vertical plate 318 can increase the force transmission efficiency between the second vertical plate 312 and the support plate 200, thereby ensuring the force transmission efficiency between the boom cylinder and the support plate 200, making the stress distribution on the telescopic arm 1 more uniform and reducing the probability of stress concentration.
[0081] like Figure 3-Figure 5As shown, in the technical solution of this embodiment, the telescopic arm 1 also includes at least one structure of the first sealing plate 330, the second sealing plate 340, the third sealing plate 350, the fourth sealing plate 360, the fifth sealing plate 370 and the sixth sealing plate 380. The first sealing plate 330 is connected to the first vertical plate 311, the second vertical plate 312 and the first transverse plate 313. The second sealing plate 340 is connected to the first vertical plate 311, the second vertical plate 312, the first transverse plate 313 and the second transverse plate 314, and the second sealing plate 340 is spaced apart from the basic arm 100. The third sealing plate 350 is connected to the second vertical plate 312, the third vertical plate 315, the second transverse plate 314 and the third transverse plate 316, and the third sealing plate 350 is spaced apart from the basic arm 100. The fourth sealing plate 360 is connected to the fourth vertical plate 317, the fifth vertical plate 318, the second transverse plate 314 and the support plate 200, and the third sealing plate 350 is spaced apart from the basic arm 100. The fifth sealing plate 370 is connected to the fifth vertical plate 318, the second horizontal plate 314 and the support plate 200, the sixth sealing plate 380 is connected to the fifth sealing plate 370, the second horizontal plate 314, the support plate 200 and the basic arm 100, the sixth sealing plate 380 is arranged corresponding to the third vertical plate 315, and the fifth sealing plate 370 is arranged at a distance from the basic arm 100.
[0082] For example, one end of the first sealing plate 330 away from the supporting arm may be connected to the base arm 100 .
[0083] By providing the first sealing plate 330, impurities such as dust can be prevented from entering between the first vertical plate 311 and the second vertical plate 312, the dust accumulation on the telescopic arm 1 is reduced, the rate at which the first amplitude change box 310 is corroded and damaged is slowed down, and the service life is extended. In addition, a space is formed between the basic arm 100, the first sealing plate 330, the first vertical plate 311, the second vertical plate 312 and the first horizontal plate 313, and the space can play a role in buffering and absorbing external forces, thereby improving the uniformity of stress distribution on the telescopic arm 1;
[0084] For example, there may be a plurality of first sealing plates 330 , and the plurality of first sealing plates 330 are arranged at intervals along the thickness of the first sealing plate 330 .
[0085] By providing the second sealing plate 340, impurities such as dust can be prevented from entering between the first vertical plate 311 and the second vertical plate 312, the dust accumulation on the telescopic arm 1 is reduced, the rate at which the first amplitude change box 310 is corroded and damaged is slowed down, and the service life is extended. In addition, a space is formed between the basic arm 100, the second sealing plate 340, the first vertical plate 311, the second vertical plate 312, the first horizontal plate 313 and the second horizontal plate 314, and the space can play a role in buffering and absorbing external forces, thereby improving the uniformity of stress distribution on the telescopic arm 1;
[0086] For example, there may be a plurality of second sealing plates 340 , and the plurality of second sealing plates 340 are arranged at intervals along the thickness of the second sealing plate 340 .
[0087] By providing the third sealing plate 350, impurities such as dust can be prevented from entering between the second vertical plate 312 and the third vertical plate 315, the dust accumulation on the telescopic arm 1 is reduced, the rate at which the first amplitude change box 310 is corroded and damaged is slowed down, and the service life is extended. In addition, a space is formed between the basic arm 100, the third sealing plate 350, the second vertical plate 312, the third vertical plate 315, the second horizontal plate 314 and the third horizontal plate 316, and the space can play a role in buffering and absorbing external forces, thereby improving the uniformity of stress distribution on the telescopic arm 1;
[0088] For example, there may be a plurality of third sealing plates 350 , and the plurality of third sealing plates 350 are arranged at intervals along the thickness of the third sealing plate 350 .
[0089] By providing the fourth sealing plate 360, impurities such as dust can be prevented from entering between the fourth vertical plate 317 and the fifth vertical plate 318, the dust accumulation on the telescopic arm 1 is reduced, the rate at which the first amplitude change box 310 is corroded and damaged is slowed down, and the service life is extended. In addition, a space is formed between the basic arm 100, the fourth sealing plate 360, the fourth vertical plate 317, the fifth vertical plate 318, the second horizontal plate 314 and the support plate 200, and the space can play a role in buffering and absorbing external forces, thereby improving the uniformity of stress distribution on the telescopic arm 1;
[0090] For example, there may be a plurality of fourth sealing plates 360 , and the plurality of fourth sealing plates 360 are arranged at intervals along the thickness of the fourth sealing plate 360 .
[0091] By providing the fifth sealing plate 370 and the sixth sealing plate 380, dust and other impurities can be prevented from entering between the third horizontal plate 316 and the support plate 200, thereby reducing the dust accumulation on the telescopic arm 1, slowing down the rate at which the first amplitude change box 310 is corroded and damaged, and extending the service life. In addition, a space is formed between the basic arm 100, the fifth sealing plate 370, the sixth sealing plate 380, the fifth vertical plate 318, the second horizontal plate 314 and the support plate 200, and the space can buffer and absorb external forces, thereby improving the uniformity of stress distribution on the telescopic arm 1.
[0092] like Figure 3-Figure 5 As shown, in the technical solution of this embodiment, the telescopic arm 1 also includes a first anti-compression buckling reinforcement rib 500 and a second anti-compression buckling reinforcement rib 600.
[0093] The first anti-buckling reinforcement rib 500 is provided on the outer circumference of the basic arm 100, and the first anti-buckling reinforcement rib 500 extends along the axial direction of the basic arm 100, the first anti-buckling reinforcement rib 500 is connected to the side of the support plate 200 facing away from the amplitude change box group 300, and the first anti-buckling reinforcement rib 500 is correspondingly arranged with the first amplitude change box 310. The second anti-buckling reinforcement rib 600 is provided on the outer circumference of the basic arm 100, and the second anti-buckling reinforcement rib 600 extends along the axial direction of the basic arm 100, the second anti-buckling reinforcement rib 600 is connected to the side of the support plate 200 facing away from the amplitude change box group 300, and is correspondingly arranged with the second amplitude change box 320.
[0094] The first anti-buckling reinforcement rib 500 can be directly welded to the basic arm 100 or welded to the basic arm 100 through a bracket; the second anti-buckling reinforcement rib 600 can be directly welded to the basic arm 100 or welded to the basic arm 100 through a bracket.
[0095] By providing the first anti-buckling reinforcement rib 500 , the area corresponding to the support plate 200 and the first amplitude change box 310 can be supported to prevent the support plate 200 from being deformed due to excessive local force, thereby ensuring the structural stability of the support plate 200 .
[0096] The second anti-buckling reinforcement rib 600 can provide support for the area corresponding to the support plate 200 and the second amplitude change box 320 , thereby preventing the support plate 200 from being deformed due to excessive local force, thereby ensuring the structural stability of the support plate 200 .
[0097] Furthermore, the second anti-buckling reinforcement rib 600 extends from one end of the support plate 200 to the arm head of the basic arm 100. Under the condition of hoisting, the basic arm 100 is subjected to bending moment, the front end of the support plate 200 is concave inward, and the stress is large in the transition zone where the rigidity difference is large. By increasing the length of the second anti-buckling reinforcement rib 600, the size of the basic arm 100 covered by the second anti-buckling reinforcement rib 600 is large, the overall rigidity of the basic arm 100 can be increased, and the anti-buckling moment capacity of the basic arm 100 is further improved, and the hoisting performance of the basic arm 100 is greatly improved.
[0098] In addition, the length of the first anti-buckling reinforcement rib 500 is L1, and the length of the second anti-buckling reinforcement rib 600 is L2, and 1.5≤L2 / L1≤2. Wherein, L2 / L1 can be 1.5, 1.6, 1.7, 1.8, 1.9 or 2.
[0099] By setting L2 / L1 to be not less than 1.5, it is possible to avoid the length of the first anti-compression buckling reinforcement rib 500 being too long, and to prevent the first anti-compression buckling reinforcement rib 500 from having a large bending moment at the end away from the support plate 200, thereby avoiding excessive stress concentration at the connection between the basic arm 100 and the end of the first anti-compression buckling reinforcement rib 500 away from the support plate 200, and reducing the probability of damage to the basic arm 100; by setting L2 / L1 to be not greater than 2, it is possible to avoid the length of the first anti-compression buckling reinforcement rib 500 being too short, and the connection area between the first anti-compression buckling reinforcement rib 500 and the basic arm 100 being small, thereby avoiding insufficient rigidity of the first anti-compression buckling reinforcement rib 500 at the connection between the support plate 200 and the first amplitude change box 310, and effectively preventing the support plate 200 from deformation.
[0100] In addition, the first anti-compression buckling reinforcement rib 500 and the second anti-compression buckling reinforcement rib 600 are arranged at intervals, the first anti-compression buckling reinforcement rib 500 has a larger thickness, and the second anti-compression buckling reinforcement rib 600 has a smaller thickness. While ensuring that the bending moment resistance performance of the anti-compression buckling reinforcement rib meets the requirements, the weight of the telescopic arm 1 can also be reduced.
[0101] In addition, the included angle between the central axis of the second anti-buckling reinforcement rib 600 and the first inclined plate 321 is R1, and the included angle between the central axis of the second anti-buckling reinforcement rib 600 and the second inclined plate 322 is R2, and R1 is smaller than R2.
[0102] Since the connection between the first inclined plate 321 and the first amplitude change box 310 is higher than the connection between the second inclined plate 322 and the first amplitude change box 310, the stress borne by the first inclined plate 321 is greater than the stress borne by the second inclined plate 322. By making the angle between the central axis of the second anti-compression reinforcement rib 600 and the first inclined plate 321 smaller, it is beneficial to the transmission of force between the first inclined plate 321 and the second anti-compression reinforcement rib 600, so as to avoid excessive stress on the support plate 200 at the corresponding points of the first inclined plate 321 and the second anti-compression reinforcement rib 600, thereby reducing the deformation probability of the support plate 200.
[0103] According to an embodiment of the present invention, on the other hand, a crane is further provided, the crane comprising the telescopic arm 1 and a luffing cylinder, the luffing cylinder being connected to a first luffing box 310. The crane may be a mobile crane. Furthermore, the luffing cylinder is located between two adjacent luffing box groups 300, and the luffing cylinder is connected to the first luffing boxes 310 of the two adjacent luffing box groups 300, so that the upper limit of the luffing capacity of the luffing cylinder can be increased, and the luffing cylinder can drive the telescopic arm 1 to extend and retract.
[0104] The crane of the embodiment of the present invention, using the telescopic arm 1, has the advantage of uniform stress distribution, and effectively avoids local stress concentration.
[0105] The force transmission process of the telescopic arm 1 is described below in conjunction with the accompanying drawings:
[0106] First, the luffing cylinder is connected to two adjacent luffing box groups 300, and the luffing cylinder and the load connected thereto transmit force to the two luffing box groups 300;
[0107] Then, the force of each amplitude box group 300 is transmitted through the first vertical plate 311, the second vertical plate 312 and the third vertical plate 315, a part of the force is transmitted to the second horizontal plate 314, and then transmitted to the support plate 200 through the fourth vertical plate 317 and the fifth vertical plate 318, and another part of the force is transmitted to the second horizontal plate 314, and then transmitted to the first inclined plate 321 and the second inclined plate 322 through the fourth vertical plate 317 and the fifth vertical plate 318, and then transmitted to the support plate 200;
[0108] Finally, the support plate 200 transmits the force to the first anti-buckling reinforcement rib 500 and the second anti-buckling reinforcement rib 600 .
[0109] Among them, those skilled in the art can understand that, in the above process, the first sealing plate 330, the second sealing plate 340, the third sealing plate 350, the fourth sealing plate 360, the fifth sealing plate 370 and the sixth sealing plate 380 also participate in the transmission of force, and the force of the first amplitude change box 310, the force of the second amplitude change box 320 and the force of the support plate 200 will also be transmitted to the basic arm 100.
[0110] In addition, the above-mentioned transverse plates, vertical plates, support plate 200, third amplitude change box 400, first anti-buckling reinforcement rib 500, second anti-buckling reinforcement rib 600 and basic arm 100 can be welded to each other or connected by other means.
[0111] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.
Claims
1. A telescopic arm, characterized in that: include: Basic Arm (100); A support plate (200) is provided on the outer peripheral surface of the basic arm (100) and extends along the circumference of the basic arm (100); Two amplitude change box groups (300) are symmetrically arranged on both sides of the basic arm (100), and the amplitude change box group (300) comprises a first amplitude change box (310) and a second amplitude change box (320). The first amplitude change box (310) and the second amplitude change box (320) are both arranged on the outer peripheral surface of the basic arm (100). The first amplitude change box (310) extends along the axial direction of the basic arm (100), and the second amplitude change box (320) is inclined relative to the axial direction of the basic arm (100). One end of the first amplitude change box (310) abuts against the support plate (200), and the other end is used for connecting to the amplitude change cylinder. One end of the second amplitude change box (320) abuts against the support plate (200), and the other end abuts against the side surface of the first amplitude change box (310).
2. The telescopic arm according to claim 1, characterized in that: The second amplitude transformer boxes (320) of two adjacent amplitude transformer boxes groups (300) are located between the two first amplitude transformer boxes (310).
3. The telescopic arm according to claim 1, characterized in that: Also includes: The third amplitude change box (400) is connected between two adjacent first amplitude change boxes (310) and is located on a side of the second amplitude change box (320) away from the support plate (200). The third amplitude change box (400) is spaced apart from the basic arm (100).
4. The telescopic arm according to claim 1, characterized in that: The second amplitude changing box (320) comprises: A first inclined plate (321) is arranged on the outer peripheral surface of the basic arm (100) and is arranged to be inclined relative to the axial direction of the basic arm (100), one end of the first inclined plate (321) abuts against the support plate (200) and the other end abuts against the side surface of the first amplitude change box (310); a second inclined plate (322) disposed on the outer peripheral surface of the basic arm (100) and inclined relative to the axial direction of the basic arm (100); the second inclined plate (322) is spaced apart from the first inclined plate (321) and is located between the first inclined plate (321) and the support plate (200); one end of the second inclined plate (322) abuts against the support plate (200) and the other end abuts against the side surface of the first amplitude change box (310); Wherein, the distance between the first inclined plate (321) and the second inclined plate (322) gradually increases in a direction away from the support plate (200).
5. The telescopic arm according to claim 4, characterized in that: The second amplitude changing box (320) further comprises: a first cover plate (323) connected to the first inclined plate (321), the second inclined plate (322) and the support plate (200), the first cover plate (323) being spaced apart from the basic arm (100); A second cover plate (324) is connected to the first inclined plate (321), the first amplitude change box (310) and the support plate (200), and the second cover plate (324) is spaced apart from the basic arm (100).
6. The telescopic arm according to claim 4, characterized in that: The first amplitude transformer box (310) comprises: A first vertical plate (311) is arranged on the outer peripheral surface of the basic arm (100) and extends along the axial direction of the basic arm (100); one end of the first vertical plate (311) is connected to the support plate (200), and the other end is used to be connected to the amplitude cylinder; the side surface of the first vertical plate (311) is connected to the first inclined plate (321) and the second inclined plate (322); a second vertical plate (312) disposed on the outer peripheral surface of the basic arm (100) and extending along the axial direction of the basic arm (100); the first vertical plate (311) and the second vertical plate (312) are spaced apart along the circumference of the basic arm (100); one end of the second vertical plate (312) is connected to the support plate (200), and the other end is used to be connected to the amplitude cylinder; A first transverse plate (313) is arranged on the outer peripheral surface of the basic arm (100) and extends along the circumferential direction of the basic arm (100); the first transverse plate (313) is connected to the first vertical plate (311) and the second vertical plate (312); the first transverse plate (313) and the first inclined plate (321) are arranged correspondingly to one end connected to the first vertical plate (311); A second transverse plate (314) is arranged on the outer peripheral surface of the basic arm (100) and extends along the circumferential direction of the basic arm (100); the second transverse plate (314) is connected to the first vertical plate (311) and the second vertical plate (312); the first transverse plate (313) and the second transverse plate (314) are arranged at intervals along the axial direction of the basic arm (100); the second transverse plate (314) and the second inclined plate (322) are arranged corresponding to one end connected to the first vertical plate (311).
7. The telescopic arm according to claim 6, characterized in that: The first amplitude transformer box (310) further comprises: a third vertical plate (315) disposed on the outer peripheral surface of the basic arm (100) and extending along the axial direction of the basic arm (100); the third vertical plate (315) is located on a side of the second vertical plate (312) facing away from the first vertical plate (311); the third vertical plate (315) and the second vertical plate (312) are spaced apart along the circumference of the basic arm (100); one end of the third vertical plate (315) is connected to the support plate (200), and the other end is used to be connected to the amplitude cylinder; The third transverse plate (316) is connected between the second vertical plate (312) and the third vertical plate (315) and extends along the circumference of the basic arm (100). The third transverse plate (316) is arranged on a side of the first transverse plate (313) facing away from the support plate (200).
8. The telescopic arm according to claim 7, characterized in that: The second horizontal plate (314) is connected to one end of the first vertical plate (311) facing the support plate (200), one end of the second vertical plate (312) facing the support plate (200), and one end of the third vertical plate (315) facing the support plate (200); The first amplitude transformer box (310) further comprises: a fourth vertical plate (317), which is disposed on the outer peripheral surface of the basic arm (100) and extends along the circumference of the basic arm (100); the fourth vertical plate (317) is connected between the second transverse plate (314) and the support plate (200), and is disposed corresponding to the first vertical plate (311); A fifth vertical plate (318) is disposed on the outer peripheral surface of the basic arm (100) and extends along the circumference of the basic arm (100). The fifth vertical plate (318) is connected between the second transverse plate (314) and the support plate (200) and is disposed corresponding to the second vertical plate (312).
9. The telescopic arm according to claim 8, characterized in that: Also includes at least one structure: A first sealing plate (330) connected to the first vertical plate (311), the second vertical plate (312) and the first horizontal plate (313); A second sealing plate (340) connected to the first vertical plate (311), the second vertical plate (312), the first horizontal plate (313) and the second horizontal plate (314); A third sealing plate (350) connected to the second vertical plate (312), the third vertical plate (315), the second horizontal plate (314) and the third horizontal plate (316); a fourth sealing plate (360), connected to the fourth vertical plate (317), the fifth vertical plate (318), the second horizontal plate (314) and the supporting plate (200); A fifth sealing plate (370) and a sixth sealing plate (380), wherein the fifth sealing plate (370) is connected to the fifth vertical plate (318), the second horizontal plate (314) and the support plate (200), and the sixth sealing plate (380) is connected to the fifth sealing plate (370), the second horizontal plate (314), the support plate (200) and the basic arm (100), and the sixth sealing plate (380) is arranged corresponding to the third vertical plate (315).
10. The telescopic arm according to any one of claims 1 to 9, characterized in that: Also includes: A first anti-buckling reinforcing rib (500) is arranged on the outer peripheral surface of the basic arm (100) and extends along the axial direction of the basic arm (100); the first anti-buckling reinforcing rib (500) is connected to a side of the support plate (200) facing away from the amplitude variation box group (300) and is arranged corresponding to the first amplitude variation box (310); A second anti-buckling reinforcement rib (600) is arranged on the outer peripheral surface of the basic arm (100) and extends along the axial direction of the basic arm (100); the second anti-buckling reinforcement rib (600) is connected to a side of the support plate (200) facing away from the amplitude variation box group (300) and is arranged corresponding to the second amplitude variation box (320).
11. The telescopic arm according to claim 10, characterized in that: The second anti-buckling reinforcement rib (600) extends from one end of the support plate (200) to the arm head of the basic arm (100); and / or, The length of the first anti-buckling reinforcement rib (500) is L1, the length of the second anti-buckling reinforcement rib (600) is L2, 1.5≤L2 / L1≤2; and / or, The angle between the central axis of the second anti-buckling reinforcement rib (600) and the first inclined plate (321) is R1, and the angle between the central axis of the second anti-buckling reinforcement rib (600) and the second inclined plate (322) is R2, and R1<R2.
12. A mobile crane, characterized in that: include: The telescopic arm (1) according to any one of claims 1 to 11; The luffing cylinder is connected to the first luffing box (310).