Knuckleboom crane

Abstract

The disclosure provides a folding arm crane, and belongs to the technical field of cranes. The folding arm crane comprises a base, a horizontal arm, a vertical arm and a compression assembly; the vertical arm comprises a plurality of vertical telescopic arms and a roller unit which are successively sleeved together from inside to outside, and the top end of the vertical telescopic arm located at the outermost layer is hinged to one end of the horizontal arm; the compression assembly is connected with the plurality of vertical telescopic arms respectively, and the compression assembly is used for applying a radial force to the connected vertical telescopic arms, so that when the first vertical telescopic arm and the second vertical telescopic arm slide relative to each other, the roller unit abuts against the first vertical telescopic arm and the second vertical telescopic arm respectively. The disclosure can reduce vibration and improve the control accuracy of the folding arm crane.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of cranes, and particularly relates to a folding arm type crane. BACKGROUND

[0002] In order to reduce the space occupied by the crane and increase the working range of the crane, the crane is usually arranged as a folding arm type crane.

[0003] In the related art, the folding arm type crane comprises a base, a horizontal arm and a vertical arm. Two ends of the horizontal arm are respectively hinged to the base and the top of the vertical arm. In order to realize telescoping, the horizontal arm comprises a plurality of horizontal telescopic arms sleeved together. The adjacent two horizontal telescopic arms can be telescopically extended along the horizontal direction. In order to reduce the friction between the adjacent two horizontal telescopic arms, the adjacent two horizontal telescopic arms are connected by rollers. The vertical arm is similar in structure to the horizontal arm, and the vertical arm also comprises a plurality of vertical telescopic arms sleeved together, and the adjacent two vertical telescopic arms are connected by rollers.

[0004] However, since the adjacent two vertical telescopic arms are also connected by rollers, there must be a gap between the vertical telescopic arm and the roller. During the working process of the crane, since the gap exists on the left and right sides in the vertical direction, and the force acting on the vertical arm when lifting a heavy object is in the vertical direction, not in the left and right directions, when the vertical arm is telescopically extended, the vertical arm will sway left and right, thereby causing severe vibration, which affects the control accuracy of the crane. SUMMARY

[0005] The folding arm type crane provided by the present disclosure can reduce vibration and improve the control accuracy of the folding arm type crane. The technical solution is as follows:

[0006] The folding arm type crane provided by the present disclosure can reduce vibration and improve the control accuracy of the folding arm type crane. The technical solution is as follows:

[0007] In still another implementation form of the disclosure, the roller unit comprises a plurality of first roller groups, each of the first roller groups comprises at least one first roller, the plurality of first roller groups correspond to the plurality of first vertical telescopic arms one by one, the first roller in the first roller group is located at the bottom of the corresponding first vertical telescopic arm and partially extends into the corresponding first vertical telescopic arm, and each of the first rollers is rotationally connected with the corresponding first vertical telescopic arm; the pressing assembly comprises a plurality of first pressing units, the plurality of first pressing units correspond to the plurality of first vertical telescopic arms and the plurality of first roller groups one by one; in the adjacent two vertical telescopic arms, the first pressing unit is located at the bottom end of the corresponding first vertical telescopic arm and is rotationally connected with the corresponding first vertical telescopic arm, and the first pressing unit is used to apply a force to the second vertical telescopic arm adjacent to the corresponding first vertical telescopic arm, so that the second vertical telescopic arm is in contact with the first roller.

[0008] In still another implementation form of the disclosure, the first roller and the first pressing unit corresponding to the first roller group are located on opposite sides of the axis direction of the first vertical telescopic arm; the first pressing unit comprises a rotating support and a force applying component, the rotating support is rotationally connected with the bottom end of the first vertical telescopic arm through a rotating shaft, the axis direction of the rotating shaft is perpendicular to the length direction of the first vertical telescopic arm, and the force applying component is connected with the rotating support and is used to drive the rotating support to abut against the second vertical telescopic arm.

[0009] In still another implementation form of the disclosure, the force applying component comprises a push rod and an elastic member; one end of the push rod is movably connected with the rotating support, the other end of the push rod is movably connected with the first vertical telescopic arm, and the length direction of the push rod is horizontal; the elastic member is sleeved outside the push rod and is clamped between the rotating support and the push rod at both ends, and the push rod is used to adjust the deformation amount of the elastic member.

[0010] In still another implementation form of the disclosure, the rotating support comprises a rotating plate and a pressing roller, the rotating plate is rotationally connected with the first vertical telescopic arm through the rotating shaft; the pressing roller is located between the rotating plate and the second vertical telescopic arm, and the pressing roller is rotationally connected with the rotating plate, the pressing roller is at least partially located in the first vertical telescopic arm, and the pressing roller is used to slide with the second vertical telescopic arm.

[0011] In a further implementation form of the present disclosure, the roller unit further comprises a plurality of second roller groups, each of the second roller groups comprising at least one second roller, the plurality of second roller groups corresponding to the plurality of second vertical telescopic arms one by one, the second roller in each of the second roller groups being located in the top of the corresponding second vertical telescopic arm and partially protruding outside the corresponding second vertical telescopic arm, the second roller being rotationally connected with the corresponding second vertical telescopic arm; the pressing assembly comprises a plurality of second pressing units, the plurality of second pressing units corresponding to the plurality of second vertical telescopic arms and the plurality of second roller groups one by one; among the two adjacent vertical telescopic arms, the second pressing unit is located at the top end of the corresponding second vertical telescopic arm and is rotationally connected with the corresponding second vertical telescopic arm, the second pressing unit being configured to apply a force to the first vertical telescopic arm adjacent to the outside of the corresponding second vertical telescopic arm, so that the first vertical telescopic arm is in contact with the second roller.

[0012] In a further implementation form of the present disclosure, the second roller and the corresponding first pressing unit are located on opposite sides of the axis direction of the first vertical telescopic arm, and the first roller and the second roller are located on the same side of the first vertical telescopic arm.

[0013] In a further implementation form of the present disclosure, the vertical arm further comprises a plurality of vertical telescopic driving members corresponding to the plurality of second vertical telescopic arms one by one, a fixed end of the vertical telescopic driving member being connected with the first vertical telescopic arm adjacent to the outer layer of the corresponding second vertical telescopic arm, the other end of the vertical telescopic driving member being connected with the corresponding second vertical telescopic arm, the vertical telescopic driving member being capable of telescoping in the vertical direction.

[0014] In a further implementation form of the present disclosure, the knuckle boom crane further comprises a first luffing oil cylinder and a second luffing oil cylinder, two ends of the first luffing oil cylinder being respectively hingedly connected with the horizontal arm and the base, two ends of the second luffing oil cylinder being respectively hingedly connected with the vertical arm and the horizontal arm.

[0015] In a further implementation form of the present disclosure, the base comprises a base table, a slewing bearing and a rotating table, the rotating table being rotationally connected with the base through the slewing bearing, the rotating table being hingedly connected with the horizontal arm.

[0016] The technical scheme provided by the embodiments of the present disclosure has the following beneficial effects:

[0017] The folding crane provided by the embodiment of the present disclosure comprises a base, a horizontal arm and a vertical arm, and further comprises a pressing assembly, and the pressing assembly is used to make the rollers in sliding contact with the first vertical telescopic arm and the second vertical telescopic arm respectively. In this way, when the vertical arm of the folding crane is telescoped, the first vertical telescopic arm and the second vertical telescopic arm can be in sliding contact with the roller unit at all times through the pressing assembly, the probability of relative shaking between the first vertical telescopic arm and the second vertical telescopic arm is reduced, vibration is ultimately reduced, and the control accuracy of the folding crane is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0019] Figure 1 A structural schematic diagram of a folding crane provided by the embodiment of the present disclosure is shown in FIG. 1.

[0020] Figure 2 A structural schematic diagram of a folding crane provided by the embodiment of the present disclosure is shown in FIG. 1. Figure 1 A structural schematic diagram of an extended state of the folding crane is shown in FIG. 2.

[0021] Figure 3 A structural schematic diagram of an extended state of the folding crane is shown in FIG. 2. Figure 2 An assembly schematic diagram of the vertical arm is shown in FIG. 3.

[0022] Figure 4 An assembly schematic diagram of the vertical arm is shown in FIG. 3. Figure 3 A structural schematic diagram of the first pressing unit is shown in FIG. 4.

[0023] Figure 5 A structural schematic diagram of the first pressing unit is shown in FIG. 4. Figure 4 A structural schematic diagram of the rotating plate is shown in FIG. 5.

[0024] Figure 6 A structural schematic diagram of the rotating plate is shown in FIG. 5. Figure 1 A schematic diagram after the horizontal arm is pitched is shown in FIG. 6.

[0025] Figure 7 An assembly schematic diagram of the horizontal arm is shown in FIG. 7.

[0026] The meanings of the symbols in the drawings are as follows:

[0027] 1, base; 11, base table; 12, slewing bearing; 13, rotating table;

[0028] 2, horizontal arm; 21, horizontal telescopic arm; 211, first horizontal telescopic arm; 2111, third roller; 212, second horizontal telescopic arm; 2121, fourth roller; 22, horizontal telescopic driving member;

[0029] 3, vertical arm; 31, vertical telescopic arm; 311, first vertical telescopic arm; 3111, arc-shaped lug; 3112, opening; 312, second vertical telescopic arm; 33, roller unit; 331, first roller; 332, second roller; 34, vertical telescopic driving member;

[0030] 4, compression assembly; 41, first compression unit; 411, rotating support; 4111, rotating plate; 4112, compression roller; 4113, connecting plate; 412, force applying member; 4121, push rod; 4122, elastic member; 413, rotating shaft; 415, first limiting plate; 416, second limiting plate; 42, second compression unit;

[0031] 5, first amplitude-changing oil cylinder; 6, second amplitude-changing oil cylinder; 7, hook. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the drawings.

[0033] The present disclosure provides a foldable arm crane, as shown in the accompanying drawings. Figure 1 A foldable arm crane includes a base 1, a horizontal arm 2, a vertical arm 3, and a compression assembly 4.

[0034] Figure 2 For Figure 1 the structure of the extended state of the foldable arm crane, in combination with Figure 2 The horizontal arm 2 includes a plurality of horizontal telescopic arms 21 which are sequentially sleeved together from inside to outside. One end of the horizontal telescopic arm 21 located at the outermost layer is hinged to the base 1. Among the adjacent two horizontal telescopic arms 21, the horizontal telescopic arm 21 located at the inner layer can move along the horizontal direction relative to the horizontal telescopic arm 21 located at the outer layer. The length direction of each horizontal telescopic arm 21 is the horizontal direction.

[0035] The vertical arm 3 includes a plurality of vertical telescopic arms 31 and a roller unit 33 which are sequentially sleeved together from inside to outside. Among the adjacent two vertical telescopic arms 31, the vertical telescopic arm 31 located at the outer layer is the first vertical telescopic arm 311, and the vertical telescopic arm 31 located at the inner layer is the second vertical telescopic arm 312. The second vertical telescopic arm 312 is slidingly connected with the first vertical telescopic arm 311 through the roller unit 33. The second vertical telescopic arm 312 can move along the vertical direction relative to the first vertical telescopic arm 311, and the length direction of each vertical telescopic arm 31 is the vertical direction. The top end of the vertical telescopic arm 31 located at the outermost layer is hinged to one end of the horizontal telescopic arm 21 located at the innermost layer.

[0036] The compression assembly 4 is connected with the plurality of vertical telescopic arms 31 respectively, and the compression assembly 4 is used for enabling the roller units 33 to be in sliding contact with the first vertical telescopic arm 311 and the second vertical telescopic arm 312 respectively.

[0037] In the folding crane provided by the embodiment of the present disclosure, not only the base 1, the horizontal arm 2 and the vertical arm 3 are included, but also the compression assembly 4 is included, and the compression assembly 4 is used for enabling the roller units 33 to be in sliding contact with the first vertical telescopic arm 311 and the second vertical telescopic arm 312 respectively. In this way, when the vertical arm 3 of the folding crane is telescoped, the first vertical telescopic arm 311 and the second vertical telescopic arm 312 can always be in sliding contact with the roller units 33 through the compression assembly 4, the probability of relative shaking between the first vertical telescopic arm 311 and the second vertical telescopic arm 312 is reduced, and finally the vibration is reduced, and the control accuracy of the folding crane is improved.

[0038] Figure 3 For Figure 2 The assembly schematic diagram of the vertical arm, in combination with Figure 3 Optionally, the roller unit 33 includes a plurality of first roller groups, each of the first roller groups includes at least one first roller 331, the plurality of first roller groups correspond to the plurality of first vertical telescopic arms 311 one by one, the first roller 331 in the first roller group is located at the bottom of the corresponding first vertical telescopic arm 311 and partially extends into the corresponding first vertical telescopic arm 311, and each first roller 331 is rotationally connected with the corresponding first vertical telescopic arm 311.

[0039] The compression assembly 4 includes a plurality of first compression units 41. The plurality of first compression units 41 correspond to the plurality of first vertical telescopic arms 311 and the plurality of first roller groups one by one. In the adjacent two vertical telescopic arms 31, the first compression unit 41 is located at the bottom end of the corresponding first vertical telescopic arm 311 and is rotationally connected with the corresponding first vertical telescopic arm 311, and the first compression unit 41 is used for exerting a radially inward force on the second vertical telescopic arm 312 adjacent to the corresponding first vertical telescopic arm 311, so that the second vertical telescopic arm 312 is in close contact with the first roller 331.

[0040] In the above implementation manner, the first roller 331 is used for guiding the second vertical telescopic arm 312 moving in and out of the first vertical telescopic arm 311, while reducing the friction between the first vertical telescopic arm 311 and the second vertical telescopic arm 312.

[0041] The first pressing unit 41 is used to apply a radial inward force to the second vertical telescopic arm 312. Since the second vertical telescopic arm 312 is located inside the first vertical telescopic arm 311, when the second vertical telescopic arm 312 is subjected to a radial inward force, one side of the second vertical telescopic arm 312 will move close to the first vertical telescopic arm 311 to close the first vertical telescopic arm 311, so that the gap between the first vertical telescopic arm 311 and the second vertical telescopic arm 312 is reduced, and finally the first roller 331 can be in abutment with the first vertical telescopic arm 311 and the second vertical telescopic arm 312 respectively when the first vertical telescopic arm 311 and the second vertical telescopic arm 312 slide relative to each other, reducing the shaking of the vertical arm 3, etc.

[0042] The first roller 331 and the first pressing unit 41 corresponding to the first roller group are located on opposite sides of the axis direction of the first vertical telescopic arm 311.

[0043] In the above implementation, by arranging the first roller 331 and the corresponding first pressing unit 41 on opposite sides of the axis direction of the first vertical telescopic arm 311, the first pressing unit 41 can apply a radial inward force to the second vertical telescopic arm 312, so that the first roller 331 is well fitted with the first vertical telescopic arm 311 and the second vertical telescopic arm 312 respectively, the gap between the first roller 331 and the first vertical telescopic arm 311 and the second vertical telescopic arm 312 is reduced, and the shaking between the first vertical telescopic arm 311 and the second vertical telescopic arm 312 is avoided.

[0044] Figure 4 For Figure 3 The structure diagram of the first pressing unit, combined with Figure 4 Optionally, the first pressing unit 41 comprises a rotating support 411 and a force applying component 412, the rotating support 411 is rotatably connected with the bottom end of the first vertical telescopic arm 311 through a rotating shaft 413, the axis direction of the rotating shaft 413 is perpendicular to the length direction of the first vertical telescopic arm 311, and the force applying component 412 is connected with the rotating support 411 and is used to drive the rotating support 411 to abut against the second vertical telescopic arm 312.

[0045] In the above implementation, the rotating support 411 is used to be rotatably connected with the first vertical telescopic arm 311. The force applying component 412 is used to drive the rotating support 411 to abut against the second vertical telescopic arm 312, so as to apply a radial inward force to the second vertical telescopic arm 312.

[0046] In other examples, the first pressing unit 41 can be a lever structure, the middle part of the rotating support 411 is rotationally connected with the outer wall of the first vertical telescopic arm 311, one end of the rotating support 411 is connected with the force applying component 412, which can be an oil cylinder or the like. The other end of the rotating support 411 is used to contact the second vertical telescopic arm 312. In this way, when the oil cylinder is retracted, the other end of the rotating support 411 drives the second vertical telescopic arm 312 to exert a radial inward force.

[0047] Optionally, the force applying component 412 includes a thrust rod 4121 and an elastic member 4122. One end of the thrust rod 4121 is movably connected with the rotating support 411, the other end of the thrust rod 4121 is movably connected with the first vertical telescopic arm 311, and the length direction of the thrust rod 4121 is horizontal.

[0048] The elastic member 4122 is sleeved on the thrust rod 4121 and clamped at both ends between the rotating support 411 and the thrust rod 4121, and the thrust rod 4121 is used to adjust the deformation amount of the elastic member 4122.

[0049] In the above implementation, the thrust rod 4121 is used to press the elastic member 4122, so that the elastic member 4122 can exert a force on the rotating support 411, thereby rotating the rotating support 411.

[0050] In the embodiment of the present disclosure, the thrust rod 4121 is a bolt or a screw rod, and the outer wall of the first vertical telescopic arm 311 is provided with a nut hole. The end of the thrust rod 4121 is threadedly connected in the nut hole. By adjusting the length of the first vertical telescopic arm 311 screwed into the nut hole, the compression amount (i.e. the deformation amount) of the elastic member 4122 can be adjusted.

[0051] In other examples, the force applying component 412 can also be other structures, such as the oil cylinder, telescopic rod and the like mentioned above.

[0052] In the embodiment of the present disclosure, the elastic member 4122 is a disc spring. In this way, the elastic member 4122 can have a large stiffness, thereby bearing a large load with a small deformation.

[0053] Optionally, the rotating support 411 includes a rotating plate 4111 and a pressing roller 4112, and the rotating plate 4111 is rotationally connected with the first vertical telescopic arm 311 through a rotating shaft 413.

[0054] The pressing roller 4112 is located between the rotating plate 4111 and the second vertical telescopic arm 312, and the pressing roller 4112 is rotationally connected with the rotating plate 4111. The pressing roller 4112 is at least partially located in the first vertical telescopic arm 311, and the pressing roller 4112 is used to slide with the second vertical telescopic arm 312. The rotating shaft of the pressing roller 4112 is parallel to the rotating shaft 413 of the rotating support 411.

[0055] In the above implementation, the rotating support 411 is provided as a rotating plate 4111 and a compression roller 4112. The rotating plate 4111 provides a mounting base for the compression roller 4112, and the rotating plate 4111 is rotationally connected to the first vertical telescopic arm 311. The compression roller 4112 is used to contact and press the second vertical telescopic arm 312. Moreover, the compression roller 4112 is used to rotationally connect with the second vertical telescopic arm 312 when the second vertical telescopic arm 312 moves, so as to reduce the friction between the two and facilitate the telescopic movement of the second vertical telescopic arm 312.

[0056] In the embodiment of the present disclosure, in order to facilitate the connection between the rotating plate 4111 and the vertical telescopic arm 31, an arc-shaped lug 3111 is arranged in the side wall of the first vertical telescopic arm 311, and the rotating plate 4111 is rotationally connected to the arc-shaped lug 3111 through a rotating shaft 413.

[0057] In order to facilitate the compression roller 4112 to extend into the vertical telescopic arm 31, an opening 3112 is arranged in the side wall of the vertical telescopic arm 31, and the compression roller 4112 is partially located in the opening 3112.

[0058] In the embodiment of the present disclosure, in order to prevent the rotating plate 4111 and the compression roller 4112 from being separated from the vertical telescopic arm 31, the first compression unit 41 further includes a first limiting plate 415 and a second limiting plate 416. The first limiting plate 415 is located on the side of the rotating plate 4111 away from the arc-shaped lug 3111, and the first limiting plate 415 is fixed to the rotating plate 4111 by a fastener such as a bolt. The second limiting plate 416 is located on the side of the rotating plate 4111 away from the compression roller 4112, and the second limiting plate 416 is fixed to the rotating plate 4111 by a fastener such as a bolt.

[0059] Figure 5 For Figure 4 the structure of the rotating plate, in combination Figure 5 The rotating support 411 further includes an L-shaped connecting plate 4113. The connecting plate 4113 is located on one side of the rotating plate 4111 along the length direction of the vertical telescopic arm 31, and is connected to the rotating plate 4111. An L-shaped cavity of the connecting plate 4113 is used to mount a force applying component 412. The elastic member 4122 is located in the L-shaped cavity of the connecting plate 4113, and one end of the thrust rod 4121 passes through the connecting plate 4113 and is connected to a screw hole in the vertical telescopic arm 31.

[0060] Again referring to Figure 3Optionally, the roller unit 33 further comprises a plurality of second roller groups, each of the second roller groups comprises at least one second roller 332, the plurality of second roller groups correspond to the plurality of second vertical telescopic arms 312 one by one, the second roller 332 in each of the second roller groups is located in the top of the corresponding second vertical telescopic arm 312 and partially protrudes out of the corresponding second vertical telescopic arm 312, and the second roller 332 is rotationally connected with the corresponding second vertical telescopic arm 312.

[0061] The pressing assembly 4 comprises a plurality of second pressing units 42, and the plurality of second pressing units 42 correspond to the plurality of second vertical telescopic arms 312 and the plurality of second roller groups one by one.

[0062] In the adjacent two vertical telescopic arms 31, the second pressing unit 42 is located at the top end of the corresponding second vertical telescopic arm 312 and is rotationally connected with the corresponding second vertical telescopic arm 312, and the second pressing unit 42 is used to apply a force to the first vertical telescopic arm 311 adjacent to the outer side of the corresponding second vertical telescopic arm 312, so that the first vertical telescopic arm 311 is in close contact with the second roller 332.

[0063] In the above implementation manner, the second roller 332 is used to further guide the second vertical telescopic arm 312 when the second vertical telescopic arm 312 enters into the first vertical telescopic arm 311, and to reduce the friction between the first vertical telescopic arm 311 and the second vertical telescopic arm 312.

[0064] And the second roller 332 and the corresponding second pressing unit 42 are arranged on the opposite sides of the axis of the second vertical telescopic arm 312, so that the second pressing unit 42 applies a radial outward force to the first vertical telescopic arm 311, which can make the second roller 332 be in good contact with the first vertical telescopic arm 311 and the second vertical telescopic arm 312, respectively, reduce the gap between the second roller 332 and the first vertical telescopic arm 311 and the second vertical telescopic arm 312, and avoid the shaking between the first vertical telescopic arm 311 and the second vertical telescopic arm 312.

[0065] That is, by arranging the second roller 332, the friction between the first vertical telescopic arm 311 and the second vertical telescopic arm 312 can be further reduced, and by arranging the second pressing unit 42, the gap between the first vertical telescopic arm 311 and the second vertical telescopic arm 312 can be further reduced, so that the first vertical telescopic arm 311 and the second vertical telescopic arm 312 can be in contact with the second roller 332 and the first roller 331, respectively.

[0066] Optionally, the second roller 332 is located on the opposite side of the axis direction of the first vertical telescopic arm 311 relative to the corresponding first pressing unit 41, and the first roller 331 and the second roller 332 are located on the same side of the first vertical telescopic arm 311.

[0067] In the above implementation, the first roller 331 and the second roller 332 are located on the same side of the first vertical telescopic arm 311, and the second roller 332 is located on the opposite side of the axis direction of the first vertical telescopic arm 311 relative to the corresponding first pressing unit 41, so that the first pressing unit 41 and the second pressing unit 42 can apply force to the same side of the first vertical telescopic arm 311 and the second vertical telescopic arm 312, so that the first vertical telescopic arm 311 and the second vertical telescopic arm 312 can be close to each other after being subjected to the force, and finally realize the fast and stable telescoping of the vertical arm 3 in the vertical direction, and the telescoping speed can reach 2m / s.

[0068] In the embodiment of the present disclosure, the second pressing unit 42 and the first pressing unit 41 are the same structure, which will not be described here.

[0069] Optionally, the vertical arm 3 further comprises a plurality of vertical telescopic driving members 34, the plurality of vertical telescopic driving members 34 correspond to the plurality of second vertical telescopic arms 312 one by one, a fixed end of the vertical telescopic driving member 34 is connected with the first vertical telescopic arm 311 outside the corresponding second vertical telescopic arm 312, the other end of the vertical telescopic driving member 34 is connected with the corresponding second vertical telescopic arm 312, and the vertical telescopic driving member 34 can be telescoped in the vertical direction.

[0070] In the above implementation, the vertical telescopic driving member 34 is used to drive the second vertical telescopic arm 312 to telescope relative to the first vertical telescopic arm 311, so that the second vertical telescopic arm 312 can be extended from the first vertical telescopic arm 311 or retracted into the first vertical telescopic arm 311, thereby realizing the lengthening or shortening of the vertical arm 3.

[0071] In the embodiment, the vertical arm 3 adopts two-stage telescoping, that is, the first vertical telescopic arm 311 is two, and the second vertical telescopic arm 312 is also two. Correspondingly, the vertical telescopic driving member 34 is also two.

[0072] It should be noted that the above-mentioned adjacent two vertical telescopic arms 31 refer to any group, as long as there is one outer vertical telescopic arm 31 and one inner vertical telescopic arm 31. Therefore, the same vertical telescopic arm 31 can be the first vertical telescopic arm 311 or the second vertical telescopic arm 312. That is to say, all the vertical telescopic arms 31 except the innermost layer are the first vertical telescopic arms 311. All the vertical telescopic arms 31 except the outermost layer are the second vertical telescopic arms 312.

[0073] Figure 6 For Figure 1 The schematic view after the horizontal arm tilts, combined with Figure 6 Optionally, the folding crane further comprises a first luffing cylinder 5 and a second luffing cylinder 6, two ends of the first luffing cylinder 5 are respectively hinged with the horizontal arm 2 and the base 1, and two ends of the second luffing cylinder 6 are respectively hinged with the vertical arm 3 and the horizontal arm 2.

[0074] In the above implementation manner, the first luffing cylinder 5 is used to change the included angle between the horizontal arm 2 and the base 1, thereby realizing the tilting of the horizontal arm 2. The second luffing cylinder 6 is used to change the included angle between the vertical arm 3 and the horizontal arm 2, thereby changing so that the vertical arm 3 always remains in the vertical direction to hoist.

[0075] Optionally, the folding crane further comprises a hook 7, the hook 7 is connected with the end of the vertical telescopic arm 31 located in the innermost layer and away from the horizontal arm 2. The hook 7 is used to hoist heavy objects.

[0076] The hook 7 can be a mechanical hand, a hook, etc.

[0077] Optionally, the base 1 comprises a base table 11, a rotary support 12 and a rotating table 13, the rotating table 13 is rotationally connected with the base 1 through the rotary support 12. The rotating table 13 is hinged with the horizontal arm 2.

[0078] The base 1 is arranged in the above structure, which can make the base 1 drive the horizontal arm 2 to rotate in a 360-degree circle, thereby changing the hoisting range of the vertical arm 3.

[0079] Figure 7 The schematic view for the assembly of the horizontal arm, combined with Figure 7 The horizontal telescopic arm 21 located in the outer layer among the two adjacent horizontal telescopic arms 21 is a first horizontal telescopic arm 211, and the horizontal telescopic arm 21 located in the inner layer is a second horizontal telescopic arm 212. Two third rollers 2111 are arranged at the end of the first horizontal telescopic arm 211 facing the vertical arm 3, and the two third rollers 2111 are oppositely arranged and respectively located at opposite sides of the length direction of the first horizontal telescopic arm 211. Each third roller 2111 partially extends into the first horizontal telescopic arm 211 and is rotationally connected with the first horizontal telescopic arm 211. Each third roller 2111 is used to rotationally contact with the second horizontal telescopic arm 212.

[0080] The second horizontal telescopic arm 212 is internally provided with two fourth rollers 2121 at one end of the vertical arm 3, and the two fourth rollers 2121 are oppositely arranged and respectively located at opposite sides of the length direction of the second horizontal telescopic arm 212. Each fourth roller 2121 partially extends out of the second horizontal telescopic arm 212 and is rotationally connected with the second horizontal telescopic arm 212. Each fourth roller 2121 is used for rotationally contacting the first horizontal telescopic arm 211. In this way, the friction between the first horizontal telescopic arm 211 and the second horizontal telescopic arm 212 can be reduced through the third roller 2111 and the fourth roller 2121.

[0081] Moreover, since the horizontal arm 2 will be pulled by the vertical arm 3, the horizontal arm 2 as a whole will be subjected to a vertical force, so that the third roller 2111 and the fourth roller 2121 are respectively arranged at opposite sides of the length direction of the horizontal telescopic arm 21, so that the adjacent first horizontal telescopic arm 211 and the second horizontal telescopic arm 212 can be well fitted through the third roller 2111 and the fourth roller 2121, thereby avoiding the shaking between the first horizontal telescopic arm 211 and the second horizontal telescopic arm 212, and finally realizing the fast and stable telescoping of the horizontal arm 2, and the horizontal telescoping speed can reach 1.5 m / s.

[0082] Continuing to refer to Figure 7 Optionally, the horizontal arm 2 further comprises a plurality of horizontal telescopic driving members 22, and the plurality of horizontal telescopic driving members 22 are arranged in one-to-one correspondence with the plurality of second horizontal telescopic arms 212. One end of each horizontal telescopic driving member 22 is connected with one end of the corresponding second horizontal telescopic arm 212, and the other end is connected with the first horizontal telescopic arm 211 adjacent to the outer layer of the first horizontal telescopic arm 211. In this way, the length of the horizontal arm 2 can be adjusted by controlling each horizontal telescopic driving member 22 to control the telescoping of each second horizontal telescopic arm 212 relative to the outer layer of the first horizontal telescopic arm 211.

[0083] In this embodiment, the horizontal arm 2 adopts one-level telescoping, that is, the first horizontal telescopic arm 211 and the second horizontal telescopic arm 212 are both one. Correspondingly, the horizontal telescopic driving member 22 is also one.

[0084] In this embodiment, in order to facilitate control and provide sufficient power, the horizontal telescopic driving member 22 and the vertical telescopic driving member 34 are both telescopic hydraulic cylinders.

[0085] The working process of the folding crane provided by the embodiment of the present disclosure will be briefly introduced as follows:

[0086] When it is necessary to change the working range during lifting or lowering of the folding crane, the horizontal arm 2 can be controlled to telescope, so as to realize the horizontal movement of the vertical arm 3. At the same time, the telescoping between the vertical telescopic arms 31 can be changed to change the length of the vertical arm 3.

[0087] When the length of the vertical arm 3 is changed, the first pressing unit 41 and the second pressing unit 42 are adjusted to compress the elastic member 4122 by adjusting the extrusion force of the push rod 4121 on the elastic member 4122, and the reaction force generated after the elastic member 4122 is compressed makes the pressing roller 4112 press against the corresponding vertical telescopic arm 31 and maintains the corresponding pressing force, thereby eliminating the gap between the two adjacent vertical telescopic arms 31 and avoiding the shaking of the vertical arm 3.

[0088] The above description is only optional embodiments of the present disclosure and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A knuckle-joint crane, characterized in that The folding crane comprises a base (1), a horizontal arm (2), a vertical arm (3) and a pressing assembly (4); The vertical arm (3) comprises multiple vertical telescopic arms (31) and roller units (33) which are sleeved together from inside to outside, among the two adjacent vertical telescopic arms (31), the vertical telescopic arm (31) located at the outer layer is a first vertical telescopic arm (311), the vertical telescopic arm (31) located at the inner layer is a second vertical telescopic arm (312), the second vertical telescopic arm (312) is slidably connected with the first vertical telescopic arm (311) through the roller unit (33), the second vertical telescopic arm (312) can move along the vertical direction relative to the first vertical telescopic arm (311), and the top end of the vertical telescopic arm (31) located at the outermost layer is hingedly connected with one end of the horizontal arm (2); The roller unit (33) comprises multiple first roller groups, each first roller group comprises at least one first roller (331), the multiple first roller groups correspond to the multiple first vertical telescopic arms (311) in a one-to-one manner, the first roller (331) in the first roller group is located at the bottom of the corresponding first vertical telescopic arm (311) and partially extends into the corresponding first vertical telescopic arm (311), and each first roller (331) is rotationally connected with the corresponding first vertical telescopic arm (311); The pressing assembly (4) comprises a plurality of first pressing units (41) corresponding to the plurality of first vertical telescopic arms (311) and the plurality of first roller groups respectively. In adjacent two vertical telescopic arms (31), the first pressing unit (41) is located at the bottom end of the corresponding first vertical telescopic arm (311), and the first roller (331) and the first pressing unit (41) corresponding to the first roller group are located on the opposite sides of the axis direction of the first vertical telescopic arm (311). The first pressing unit (41) comprises a rotating support (411) and a force applying component (412). The rotating support (411) comprises a rotating plate (4111) and a pressing roller (4112). The rotating plate (4111) is rotationally connected to the corresponding first vertical telescopic arm (311) through a rotating shaft (413). The axis direction of the rotating shaft (413) is perpendicular to the length direction of the first vertical telescopic arm (311). The pressing roller (4112) is located between the rotating plate (4111) and the second vertical telescopic arm (312), and the pressing roller (4112) is rotationally connected to the rotating plate (4111). The pressing roller (4112) is at least partially located in the corresponding first vertical telescopic arm (311). The pressing roller (4112) is used for sliding contact with the second vertical telescopic arm (312). The force applying component (412) is connected to the rotating support (411) and is used to drive the rotating support (411) to abut against the second vertical telescopic arm (312). The pressing assembly (4) is used to apply a radial force to the connected vertical telescopic arm (31), so that when the first vertical telescopic arm (311) and the second vertical telescopic arm (312) slide relative to each other, the roller unit (33) abuts against the first vertical telescopic arm (311) and the second vertical telescopic arm (312) respectively. The first pressing unit (41) is used to apply a force to the adjacent second vertical telescopic arm (312) corresponding to the first vertical telescopic arm (311), so that the second vertical telescopic arm (312) is attached to the first roller (331).

2. A knuckle-joint boom crane according to claim 1, characterized in that The force applying component (412) comprises a thrust rod (4121) and an elastic member (4122). One end of the thrust rod (4121) is movably connected to the rotating support (411), and the other end of the thrust rod (4121) is movably connected to the first vertical telescopic arm (311). The length direction of the thrust rod (4121) is horizontal. The elastic member (4122) is sleeved on the thrust rod (4121) and clamped at both ends between the rotating support (411) and the thrust rod (4121). The thrust rod (4121) is used to adjust the deformation amount of the elastic member (4122).

3. A knuckle-joint boom crane according to claim 1, characterized in that The roller unit (33) further comprises a plurality of second roller groups, each of which comprises at least one second roller (332), and the plurality of second roller groups correspond to the plurality of second vertical telescopic arms (312) one by one, the second roller (332) in each second roller group is located in the top of the corresponding second vertical telescopic arm (312) and partially protrudes outside the corresponding second vertical telescopic arm (312), and the second roller (332) is rotationally connected with the corresponding second vertical telescopic arm (312); The pressing assembly (4) comprises a plurality of second pressing units (42), which correspond to the plurality of second vertical telescopic arms (312) and the plurality of second roller groups one by one. In the adjacent two vertical telescopic arms (31), the second pressing unit (42) is located at the top end of the corresponding second vertical telescopic arm (312) and is rotationally connected with the corresponding second vertical telescopic arm (312), and the second pressing unit (42) is used to apply force to the first vertical telescopic arm (311) adjacent to the outer side of the corresponding second vertical telescopic arm (312), so that the first vertical telescopic arm (311) is in close contact with the second roller (332).

4. A knuckle-joint boom crane according to claim 3, characterised in that The second roller (332) and the corresponding first pressing unit (41) are located on opposite sides of the axis direction of the first vertical telescopic arm (311), and the first roller (331) and the second roller (332) are located on the same side of the first vertical telescopic arm (311).

5. A knuckle-joint boom crane according to any one of claims 1 - 4, characterized in that The vertical arm (3) further comprises a plurality of vertical telescopic driving members (34) corresponding to the plurality of second vertical telescopic arms (312), one end of the vertical telescopic driving member (34) is connected with the first vertical telescopic arm (311) adjacent to the outer layer of the corresponding second vertical telescopic arm (312), and the other end of the vertical telescopic driving member (34) is connected with the corresponding second vertical telescopic arm (312), and the vertical telescopic driving member (34) can be telescoped in the vertical direction.

6. A knuckle-joint boom crane according to any one of claims 1 - 4, characterized in that The folding arm crane further comprises a first luffing oil cylinder (5) and a second luffing oil cylinder (6), both ends of the first luffing oil cylinder (5) are hingedly connected with the horizontal arm (2) and the base (1) respectively, and both ends of the second luffing oil cylinder (6) are hingedly connected with the vertical arm (3) and the horizontal arm (2) respectively.

7. A knuckle-joint boom crane according to any one of claims 1 - 4, characterized in that The base (1) comprises a base table (11), a slewing bearing (12), and a rotating table (13), the rotating table (13) is rotationally connected with the base (1) through the slewing bearing (12), and the rotating table (13) is hingedly connected with the horizontal arm (2).

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