Folding arm type crane

Abstract

The invention provides a folding arm type crane, and belongs to the technical field of cranes. The folding arm type crane comprises a base, a horizontal arm, a vertical arm and a pressing assembly. The vertical arm comprises a plurality of vertical telescopic arms and a roller unit which are sequentially sleeved together from inside to outside, and the top end of the vertical telescopic arm located on the outermost layer is hinged to one end of the horizontal arm; the pressing assembly is connected with the multiple vertical telescopic arms and used for applying radial force to the connected vertical telescopic arms, so that when the first vertical telescopic arm and the second vertical telescopic arm slide relatively, the radial force is applied to the connected vertical telescopic arms. The rolling wheel unit is connected with the first vertical telescopic arm and the second vertical telescopic arm in an abutting mode. According to the invention, vibration can be reduced, and the control precision of the folding arm type crane is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cranes, and in particular relates to a knuckle-arm crane. Background Art

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

[0003] In the related art, a folding arm crane includes a base, a horizontal arm and a vertical arm. The two ends of the horizontal arm are hinged to the base and the top of the vertical arm respectively. Among them, in order to achieve telescopic, the horizontal arm includes a plurality of horizontal telescopic arms nested together. Two adjacent horizontal telescopic arms can be telescoped in the horizontal direction. In order to reduce the friction between two adjacent horizontal telescopic arms, the adjacent horizontal telescopic arms are connected by roller sliding. The vertical arm is similar to the horizontal arm in structure, and the vertical arm also includes a plurality of vertical telescopic arms nested together, and the adjacent vertical telescopic arms are connected by roller sliding.

[0004] However, since two adjacent vertical telescopic arms are also connected by rollers for sliding connection, there must be a gap between the vertical telescopic arms and the rollers. During the operation of the crane, since the gap exists on the left and right sides of the vertical direction, and the force applied to the vertical arm when lifting heavy objects is in the vertical direction rather than the left and right directions, the vertical arm will shake left and right when it is rapidly extended and retracted, causing severe vibration and affecting the control accuracy of the crane. Summary of the invention

[0005] The embodiment of the present disclosure provides a folding arm crane, which can reduce vibration and improve the control accuracy of the folding arm crane. The technical solution is as follows:

[0006] The disclosed embodiment provides a folding arm crane, which comprises a base, a horizontal arm, a vertical arm and a clamping assembly; the vertical arm comprises a plurality of vertical telescopic arms and roller units which are sequentially connected together from the inside to the outside; among two adjacent vertical telescopic arms, the vertical telescopic arm located at the outer layer is a first vertical telescopic arm, and the vertical telescopic arm located at the inner layer is a second vertical telescopic arm; the second vertical telescopic arm is slidably connected to the first vertical telescopic arm through the roller unit; the second vertical telescopic arm can move in a vertical direction relative to the first vertical telescopic arm, and the top of the vertical telescopic arm located at the outermost layer is hinged to one end of the horizontal arm; the clamping assemblies are respectively connected to the plurality of vertical telescopic arms, and the clamping assemblies are used to apply 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.

[0007] In another implementation of the present disclosure, the roller unit includes a plurality of first roller groups, each of the first roller groups includes at least one first roller, the plurality of first roller groups correspond one-to-one to the plurality of first vertical telescopic arms, the first rollers in the first roller groups are all located at the bottom of the corresponding first vertical telescopic arms and partially extend into the corresponding first vertical telescopic arms, and each first roller is rotatably connected to the corresponding first vertical telescopic arm; the clamping assembly includes a plurality of first clamping units, and the plurality of first clamping units correspond one-to-one to the plurality of first vertical telescopic arms and the plurality of first roller groups, respectively; in two adjacent vertical telescopic arms, the first clamping unit is located at the bottom end of the corresponding first vertical telescopic arm and rotatably connected to the corresponding first vertical telescopic arm, and the first clamping 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 fits with the first roller.

[0008] In another implementation of the present disclosure, the first roller and the first clamping unit corresponding to the first roller group are respectively located on opposite sides of the axial direction of the first vertical telescopic arm; the first clamping unit includes a rotating bracket and a force-applying component, the rotating bracket is rotatably connected to the bottom end of the first vertical telescopic arm through a rotating shaft, the axial direction of the rotating shaft is perpendicular to the length direction of the first vertical telescopic arm, and the force-applying component is connected to the rotating bracket for driving the rotating bracket to abut against the second vertical telescopic arm.

[0009] In another implementation of the present disclosure, the force-applying component includes a thrust rod and an elastic member; one end of the thrust rod is movably connected to the rotating bracket, and the other end of the thrust rod is movably connected to the first vertical telescopic arm, and the length direction of the thrust rod is horizontal; the elastic member is sleeved outside the thrust rod, and both ends are clamped between the rotating bracket and the thrust rod, and the thrust rod is used to adjust the deformation of the elastic member.

[0010] In another implementation of the present disclosure, the rotating bracket includes a rotating plate and a clamping roller, and the rotating plate is rotatably connected to the first vertical telescopic arm via the rotating shaft; the clamping roller is located between the rotating plate and the second vertical telescopic arm, and the clamping roller is rotatably connected to the rotating plate, and the clamping roller is at least partially located inside the first vertical telescopic arm, and the clamping roller is used to slide in contact with the second vertical telescopic arm.

[0011] In another implementation of the present disclosure, the roller unit also includes a plurality of second roller groups, each of the second roller groups includes at least one second roller, the plurality of second roller groups correspond one-to-one to the plurality of second vertical telescopic arms, the second roller in each of the second roller groups is located inside the top of the corresponding second vertical telescopic arm, and partially protrudes outside the corresponding second vertical telescopic arm, and the second roller is rotatably connected to the corresponding second vertical telescopic arm; the clamping assembly includes a plurality of second clamping units, and the plurality of second clamping units correspond one-to-one to the plurality of second vertical telescopic arms and the plurality of second roller groups, respectively; in two adjacent vertical telescopic arms, the second clamping unit is located at the top of the corresponding second vertical telescopic arm and rotatably connected to the corresponding second vertical telescopic arm, and the second clamping unit is used to apply a force to the first vertical telescopic arm adjacent to the outer side of the corresponding second vertical telescopic arm, so that the first vertical telescopic arm fits with the second roller.

[0012] In another implementation of the present disclosure, the second roller and the corresponding first clamping unit are respectively located on opposite sides of the axial 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 another implementation of the present disclosure, the vertical arm also includes a plurality of vertical telescopic driving members, and the plurality of vertical telescopic driving members correspond one-to-one to the plurality of second vertical telescopic arms. The fixed end of the vertical telescopic driving member is connected to the first vertical telescopic arm of the outer layer adjacent to the corresponding second vertical telescopic arm, and the other end of the vertical telescopic driving member is connected to the corresponding second vertical telescopic arm, and the vertical telescopic driving member can be telescoped along the vertical direction.

[0014] In another implementation of the present disclosure, the folding arm crane also includes a first luffing cylinder and a second luffing cylinder, wherein both ends of the first luffing cylinder are respectively hinged to the horizontal arm and the base, and both ends of the second luffing cylinder are respectively hinged to the vertical arm and the horizontal arm.

[0015] In yet another implementation of the present disclosure, the base includes a pedestal, a slewing bearing and a turntable, the turntable is rotatably connected to the base via the slewing bearing, and the turntable is hinged to the horizontal arm.

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

[0017] Since the folding arm crane provided in the embodiment of the present disclosure includes not only a base, a horizontal arm and a vertical arm, but also a clamping assembly, and the clamping assembly is used to make the rollers slide in contact with the first vertical telescopic arm and the second vertical telescopic arm respectively. In this way, when the vertical arm of the folding arm crane is being extended and retracted, the clamping assembly can be used to make the first vertical telescopic arm and the second vertical telescopic arm always be able to slide in contact with the roller unit, thereby reducing the probability of relative shaking between the first vertical telescopic arm and the second vertical telescopic arm, ultimately reducing vibration and improving the control accuracy of the folding arm crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic structural diagram of a folding arm crane provided in an embodiment of the present disclosure;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure of a folding arm crane in an extended state;

[0021] Figure 3 for Figure 2 Schematic diagram of the assembly of the middle vertical arm;

[0022] Figure 4 for Figure 3 A schematic structural diagram of the first pressing unit;

[0023] Figure 5 for Figure 4 Schematic diagram of the structure of the rotating plate;

[0024] Figure 6 for Figure 1 Schematic diagram of the mid-horizontal arm after pitching;

[0025] Figure 7 It is a schematic diagram of the assembly of the horizontal arm;

[0026] The symbols in the figure mean the following:

[0027] 1. Base; 11. Base; 12. Slewing bearing; 13. Turntable;

[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 drive member;

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

[0030] 4. Clamping assembly; 41. First clamping unit; 411. Rotating bracket; 4111. Rotating plate; 4112. Clamping roller; 4113. Connecting plate; 412. Force-applying component; 4121. Thrust rod; 4122. Elastic member; 413. Rotating shaft; 415. First limiting plate; 416. Second limiting plate; 42. Second clamping unit;

[0031] 5. The first luffing cylinder; 6. The second luffing cylinder; 7. Lifting hook. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0033] The embodiment of the present disclosure provides a knuckle boom crane, such as Figure 1 As shown, a folding arm crane comprises a base 1, a horizontal arm 2, a vertical arm 3 and a clamping assembly 4.

[0034] Figure 2 for Figure 1 Schematic diagram of the structure of the extended state of the mid-folding arm crane, combined with Figure 2 The horizontal arm 2 includes a plurality of horizontal telescopic arms 21 connected together from the inside to the outside in sequence. One end of the horizontal telescopic arm 21 located in the outermost layer is hinged to the base 1. Among two adjacent horizontal telescopic arms 21, the horizontal telescopic arm 21 located in the inner layer can move in the horizontal direction relative to the horizontal telescopic arm 21 located in 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 roller units 33 which are connected together from the inside to the outside in sequence. Among two adjacent vertical telescopic arms 31, the vertical telescopic arm 31 located in the outer layer is the first vertical telescopic arm 311, and the vertical telescopic arm 31 located in the inner layer is the second vertical telescopic arm 312. The second vertical telescopic arm 312 is slidably connected to the first vertical telescopic arm 311 through the roller unit 33. The second vertical telescopic arm 312 can move in 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 in the outermost layer is hinged to one end of the horizontal telescopic arm 21 located in the innermost layer.

[0036] The clamping assembly 4 is connected to the plurality of vertical telescopic arms 31 , respectively. The clamping assembly 4 is used to make the roller unit 33 slide in contact with the first vertical telescopic arm 311 and the second vertical telescopic arm 312 , respectively.

[0037] Since the folding arm crane provided in the embodiment of the present disclosure includes not only the base 1, the horizontal arm 2 and the vertical arm 3, but also includes the clamping assembly 4, and the clamping assembly 4 is used to make the roller unit 33 slide and 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 arm crane is being extended and retracted, the first vertical telescopic arm 311 and the second vertical telescopic arm 312 can always slide and contact with the roller unit 33 through the clamping assembly 4, thereby reducing the probability of relative shaking between the first vertical telescopic arm 311 and the second vertical telescopic arm 312, and finally reducing vibration, thereby improving the control accuracy of the folding arm crane.

[0038] Figure 3 for Figure 2 Schematic diagram of the assembly of the middle vertical arm, combined 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 one-to-one to the plurality of first vertical telescopic arms 311, the first rollers 331 in the first roller groups are all located at the bottom of the corresponding first vertical telescopic arms 311, and partially extend into the corresponding first vertical telescopic arms 311, and each of the first rollers 331 is rotatably connected to the corresponding first vertical telescopic arms 311.

[0039] The clamping assembly 4 includes a plurality of first clamping units 41. The plurality of first clamping units 41 correspond to the plurality of first vertical telescopic arms 311 and the plurality of first roller groups, respectively. In two adjacent vertical telescopic arms 31, the first clamping unit 41 is located at the bottom end of the corresponding first vertical telescopic arm 311 and is rotatably connected to the corresponding first vertical telescopic arm 311. The first clamping unit 41 is used to apply a radially inward force to the second vertical telescopic arm 312 adjacent to the corresponding first vertical telescopic arm 311, so that the second vertical telescopic arm 312 fits the first roller 331.

[0040] In the above implementation, the first roller 331 is used to guide 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 clamping unit 41 is used to apply a radially 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 radially inward force, one side of the second vertical telescopic arm 312 will move closer to the first vertical telescopic arm 311 and get close to 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 respectively abut against the first vertical telescopic arm 311 and the second vertical telescopic arm 312 when the first vertical telescopic arm 311 and the second vertical telescopic arm 312 slide relative to each other, thereby reducing the shaking of the vertical arm 3.

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

[0043] In the above implementation, the first roller 331 and the corresponding first clamping unit 41 are arranged on opposite sides of the axis of the first vertical telescopic arm 311, so that the first clamping unit 41 can apply a radially inward force to the second vertical telescopic arm 312 to make the first roller 331 fit well with the first vertical telescopic arm 311 and the second vertical telescopic arm 312, thereby reducing the gap between the first roller 331 and the first vertical telescopic arm 311 and the second vertical telescopic arm 312, and avoiding shaking between the first vertical telescopic arm 311 and the second vertical telescopic arm 312.

[0044] Figure 4 for Figure 3 The structural diagram of the first pressing unit in Figure 4 Optionally, the first clamping unit 41 includes a rotating bracket 411 and a force-applying component 412. The rotating bracket 411 is rotatably connected to the bottom end of the first vertical telescopic arm 311 through a rotating shaft 413. The axial direction of the rotating shaft 413 is perpendicular to the length direction of the first vertical telescopic arm 311. The force-applying component 412 is connected to the rotating bracket 411 and is used to drive the rotating bracket 411 to abut against the second vertical telescopic arm 312.

[0045] In the above implementation, the rotating bracket 411 is used to be rotatably connected to the first vertical telescopic arm 311. The force applying component 412 is used to drive the rotating bracket 411 to abut against the second vertical telescopic arm 312, thereby applying a radially inward force to the second vertical telescopic arm 312.

[0046] In other examples, the first pressing unit 41 may be a lever structure, the middle portion of the rotating bracket 411 is rotatably connected to the outer wall of the first vertical telescopic arm 311, one end of the rotating bracket 411 is connected to the force applying component 412, and the force applying component 412 may be an oil cylinder, etc. The other end of the rotating bracket 411 is used to contact the second vertical telescopic arm 312. In this way, when the oil cylinder is extended and retracted, it will drive the other end of the rotating bracket 411 to apply a radially inward force to the second vertical telescopic arm 312.

[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 to the rotating bracket 411, and the other end of the thrust rod 4121 is movably connected to the first vertical telescopic arm 311, and the length direction of the thrust rod 4121 is horizontal.

[0048] The elastic member 4122 is sleeved outside the thrust rod 4121 , and both ends are clamped between the rotating bracket 411 and the thrust rod 4121 . The thrust rod 4121 is used to adjust the deformation 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 bracket 411, thereby causing the rotating bracket 411 to rotate.

[0050] In the disclosed embodiment, the thrust rod 4121 is a bolt or a screw, etc., and a nut hole is provided in the outer wall of the first vertical telescopic arm 311. 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 (that is, the deformation amount) of the elastic member 4122 can be adjusted.

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

[0052] In the disclosed embodiment, the elastic member 4122 is a disc spring, which can make the elastic member 4122 have greater rigidity, so as to withstand a large load with a small deformation.

[0053] Optionally, the rotating bracket 411 includes a rotating plate 4111 and a pressing roller 4112 , and the rotating plate 4111 is rotatably connected to the first vertical telescopic arm 311 via 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 rotatably connected to 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 for sliding contact with the second vertical telescopic arm 312. The rotation axis of the pressing roller 4112 is parallel to the rotation axis 413 of the rotating bracket 411.

[0055] In the above implementation, the rotating bracket 411 is configured as a rotating plate 4111 and a pressing roller 4112, and the rotating plate 4111 can provide a mounting base for the pressing roller 4112, and the rotating plate 4111 can be rotatably connected to the first vertical telescopic arm 311. The pressing roller 4112 is used to contact and squeeze the second vertical telescopic arm 312. The pressing roller 4112 is used to achieve a rolling connection with the second vertical telescopic arm 312 during movement, so as to reduce the friction between the two and facilitate the extension and retraction of the second vertical telescopic arm 312.

[0056] In the disclosed embodiment, in order to facilitate the connection between the rotating plate 4111 and the vertical telescopic arm 31 , an arc-shaped ear plate 3111 is provided in the side wall of the first vertical telescopic arm 311 , and the rotating plate 4111 is rotatably connected to the arc-shaped ear plate 3111 via a rotating shaft 413 .

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

[0058] In the embodiment of the present disclosure, in order to prevent the rotating plate 4111 and the pressing roller 4112 from being separated from the vertical telescopic arm 31, the first pressing unit 41 further includes a first limiting plate 415 and a second limiting plate 416. The first limiting plate 415 is located on a side of the rotating plate 4111 away from the arc-shaped ear plate 3111, and the first limiting plate 415 and the rotating plate 4111 are fixed together by bolts or other fasteners. The second limiting plate 416 is located on a side of the rotating plate 4111 away from the pressing roller 4112, and the second limiting plate 416 and the rotating plate 4111 are fixed together by bolts or other fasteners.

[0059] Figure 5 for Figure 4 Schematic diagram of the structure of the rotating plate, combined with Figure 5 The rotating bracket 411 further includes an L-shaped connecting plate 4113, which is located on one side of the rotating plate 4111 along the length direction of the vertical telescopic arm 31 and connected to the rotating plate 4111. The L-shaped cavity of the connecting plate 4113 is used to install the force-applying component 412. Among them, 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 the screw hole in the vertical telescopic arm 31.

[0060] See again Figure 3Optionally, the roller unit 33 also includes multiple second roller groups, each second roller group includes at least one second roller 332, and the multiple second roller groups correspond one by one to the multiple second vertical telescopic arms 312. The second roller 332 in each of the second roller groups is located inside the top of the corresponding second vertical telescopic arm 312, and partially protrudes outside the corresponding second vertical telescopic arm 312. The second roller 332 is rotatably connected to the corresponding second vertical telescopic arm 312.

[0061] The clamping assembly 4 includes a plurality of second clamping units 42 , and the plurality of second clamping units 42 correspond one-to-one to the plurality of second vertical telescopic arms 312 and the plurality of second roller groups, respectively.

[0062] In the two adjacent vertical telescopic arms 31, the second clamping unit 42 is located at the top of the corresponding second vertical telescopic arm 312 and is rotatably connected to the corresponding second vertical telescopic arm 312. The second clamping unit 42 is used to apply force to the first vertical telescopic arm 311 adjacent to the outside of the corresponding second vertical telescopic arm 312, so that the first vertical telescopic arm 311 fits with the second roller 332.

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

[0064] By arranging the second roller 332 and the corresponding second clamping unit 42 on opposite sides of the axis of the second vertical telescopic arm 312, the second clamping unit 42 can apply a radial outward force to the first vertical telescopic arm 311, so that the second roller 332 can fit well with the first vertical telescopic arm 311 and the second vertical telescopic arm 31, respectively, thereby reducing the gap between the second roller 332 and the first vertical telescopic arm 311 and the second vertical telescopic arm 312, and avoiding shaking between the first vertical telescopic arm 311 and the second vertical telescopic arm 312.

[0065] That is to say, by setting the second roller 332, the friction between the first vertical telescopic arm 311 and the second vertical telescopic arm 312 can be further reduced. At the same time, by setting the second clamping 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 contact the second roller 332 and the first roller 331 respectively.

[0066] Optionally, the second roller 332 and the corresponding first pressing unit 41 are respectively located on opposite sides of the axial 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 .

[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 and the corresponding first clamping unit 41 are respectively located on the opposite sides of the axial direction of the first vertical telescopic arm 311, so that the first clamping unit 41 and the second clamping unit 42 can apply a force to the first vertical telescopic arm 311 and the second vertical telescopic arm 312 on the same side, so that the first vertical telescopic arm 311 and the second vertical telescopic arm 312 can move closer to each other after being subjected to the force, and finally the vertical arm 3 can be quickly and smoothly extended and retracted in the vertical direction, and the telescopic movement speed can reach 2m / s.

[0068] In the disclosed embodiment, the second pressing unit 42 has the same structure as the first pressing unit 41 and will not be described in detail here.

[0069] Optionally, the vertical arm 3 also includes multiple vertical telescopic driving members 34, and the multiple vertical telescopic driving members 34 correspond one by one to the multiple second vertical telescopic arms 312. The fixed end of the vertical telescopic driving member 34 is connected to the first vertical telescopic arm 311 of the outer layer of the corresponding second vertical telescopic arm 312, and the other end of the vertical telescopic driving member 34 is connected to the corresponding second vertical telescopic arm 312. The vertical telescopic driving member 34 can be telescoped along the vertical direction.

[0070] In the above implementation, the vertical telescopic drive 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 extend from the first vertical telescopic arm 311 or retract into the first vertical telescopic arm 311, thereby realizing the extension or shortening of the vertical arm 3.

[0071] In this embodiment, the vertical arm 3 adopts two-stage telescopic operation, that is, there are two first vertical telescopic arms 311 and two second vertical telescopic arms 312. Correspondingly, there are also two vertical telescopic driving members 34.

[0072] It should be noted that the two adjacent vertical telescopic arms 31 mentioned above refer to any group as long as there is an outer vertical telescopic arm 31 and an 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. In other words, all vertical telescopic arms 31 except the innermost layer are the first vertical telescopic arms 311. All vertical telescopic arms 31 except the outermost layer are the second vertical telescopic arms 312.

[0073] Figure 6 for Figure 1 Schematic diagram of the mid-horizontal arm after pitching, combined with Figure 6 Optionally, the folding arm crane also includes a first luffing cylinder 5 and a second luffing cylinder 6, the two ends of the first luffing cylinder 5 are respectively hinged to the horizontal arm 2 and the base 1, and the two ends of the second luffing cylinder 6 are respectively hinged to the vertical arm 3 and the horizontal arm 2.

[0074] In the above implementation, the first luffing cylinder 5 is used to change the angle between the horizontal arm 2 and the base 1, thereby achieving the pitch of the horizontal arm 2. The second luffing cylinder 6 is used to change the angle between the vertical arm 3 and the horizontal arm 2, thereby changing the vertical arm 3 so that it always maintains the vertical lifting direction.

[0075] The folding arm crane further comprises a hook 7, which is connected to an end of the innermost vertical telescopic arm 31 away from the horizontal arm 2. The hook 7 is used to lift heavy objects.

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

[0077] Optionally, the base 1 includes a base 11, a slewing bearing 12 and a turntable 13, and the turntable 13 is rotatably connected to the base 1 through the slewing bearing 12. The turntable 13 is hinged to the horizontal arm 2.

[0078] By configuring the base 1 to have the above structure, the base 1 can drive the horizontal arm 2 to perform a 360-degree circular rotation, thereby changing the lifting range of the vertical arm 3 .

[0079] Figure 7 The assembly diagram of the horizontal arm is shown in Figure 2. Figure 7 The horizontal telescopic arm 21 located at the outer layer of the two adjacent horizontal telescopic arms 21 is the first horizontal telescopic arm 211, and the horizontal telescopic arm 21 located at the inner layer is the second horizontal telescopic arm 212. Two third rollers 2111 are provided at one end of the first horizontal telescopic arm 211 facing the vertical arm 3. The two third rollers 2111 are arranged opposite to each other and are 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 to the first horizontal telescopic arm 211. Each third roller 2111 is used to make rotational contact with the second horizontal telescopic arm 212.

[0080] Two fourth rollers 2121 are provided in one end of the second horizontal telescopic arm 212 away from the vertical arm 3, and the two fourth rollers 2121 are arranged opposite to each other and are respectively located on 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 to the second horizontal telescopic arm 212. Each fourth roller 2121 is used for rotationally contacting with 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 by the third roller 2111 and the fourth roller 2121.

[0081] Moreover, since the horizontal arm 2 will be dragged by the vertical arm 3, the horizontal arm 2 as a whole will be subjected to the vertical force. Therefore, the third roller 2111 and the fourth roller 2121 are respectively arranged on the opposite sides of the length direction of the horizontal telescopic arm 21. The third roller 2111 and the fourth roller 2121 can make the two adjacent first horizontal telescopic arms 211 and the second horizontal telescopic arms 212 fit well with each other through the third roller 2111 and the fourth roller 2121, thereby avoiding shaking between the first horizontal telescopic arm 211 and the second horizontal telescopic arm 212, and finally realizing the rapid and smooth extension and retraction of the horizontal arm 2, and the horizontal extension speed can reach 1.5m / s.

[0082] Continue to see Figure 7 Optionally, the horizontal arm 2 further includes a plurality of horizontal telescopic driving members 22, and the plurality of horizontal telescopic driving members 22 are arranged one by one with the plurality of second horizontal telescopic arms 212, and one end of each horizontal telescopic driving member 22 is connected to one end of the corresponding second horizontal telescopic arm 212, and the other end is connected to the corresponding first horizontal telescopic arm 211 adjacent to the outer layer. In this way, each second horizontal telescopic arm 212 can be controlled to telescope relative to the outer layer first horizontal telescopic arm 211 by controlling each horizontal telescopic driving member 22, thereby adjusting the length of the horizontal arm 2.

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

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

[0085] The following briefly introduces the working process of the knuckle boom crane provided by the embodiment of the present disclosure:

[0086] When the folding arm crane is required to lift or put down heavy objects and the operating range needs to be changed, the horizontal arm 2 can be controlled to be telescopic to achieve the horizontal movement of the vertical arm 3. At the same time, the telescopic distance 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 elastic member 4122 is compressed by adjusting the squeezing force of the thrust rod 4121 in the first clamping unit 41 and the second clamping unit 42 on the elastic member 4122; the reaction force generated after the elastic member 4122 is compressed will cause the clamping roller 4112 to be pressed against the corresponding vertical telescopic arm 31 and maintain the corresponding clamping force, thereby eliminating the gap between the two adjacent vertical telescopic arms 31 and preventing the vertical arm 3 from shaking.

[0088] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A folding arm crane, characterized in that: The folding arm crane comprises a base (1), a horizontal arm (2), a vertical arm (3) and a clamping assembly (4); The vertical arm (3) comprises a plurality of vertical telescopic arms (31) and roller units (33) which are connected together in sequence from the inside to the outside; of two adjacent vertical telescopic arms (31), the vertical telescopic arm (31) located at the outer layer is a first vertical telescopic arm (311), and 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 to the first vertical telescopic arm (311) via the roller unit (33); the second vertical telescopic arm (312) can move in a 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 hinged to one end of the horizontal arm (2); The clamping assembly (4) is respectively connected to the plurality of vertical telescopic arms (31), and the clamping assembly (4) is used to apply radial force to the connected vertical telescopic arms (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) is respectively in contact with the first vertical telescopic arm (311) and the second vertical telescopic arm (312).

2. The folding arm crane according to claim 1, characterized in that: The roller unit (33) comprises a plurality of first roller groups, each of the first roller groups comprises 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 rollers (331) in the first roller groups are all located at the bottom of the corresponding first vertical telescopic arms (311) and partially extend into the corresponding first vertical telescopic arms (311), and each first roller (331) is rotatably connected to the corresponding first vertical telescopic arm (311); The clamping assembly (4) comprises a plurality of first clamping units (41), and the plurality of first clamping units (41) correspond one-to-one to the plurality of first vertical telescopic arms (311) and the plurality of first roller groups respectively; In the two adjacent vertical telescopic arms (31), the first clamping unit (41) is located at the bottom end of the corresponding first vertical telescopic arm (311) and is rotationally connected to the corresponding first vertical telescopic arm (311), and the first clamping unit (41) is used to apply a force to the second vertical telescopic arm (312) adjacent to the corresponding first vertical telescopic arm (311), so that the second vertical telescopic arm (312) fits with the first roller (331).

3. The knuckle boom crane according to claim 2, characterized in that: The first roller (331) and the first pressing unit (41) corresponding to the first roller group are respectively located on opposite sides of the axis direction of the first vertical telescopic arm (311); The first clamping unit (41) comprises a rotating bracket (411) and a force-applying component (412); the rotating bracket (411) is rotatably connected to the bottom end of the first vertical telescopic arm (311) via a rotating shaft (413); the axial direction of the rotating shaft (413) is perpendicular to the length direction of the first vertical telescopic arm (311); the force-applying component (412) is connected to the rotating bracket (411) and is used to drive the rotating bracket (411) to abut against the second vertical telescopic arm (312).

4. The folding arm crane according to claim 3, 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 bracket (411), and the other end of the thrust rod (4121) is movably connected to the first vertical telescopic arm (311), and the length direction of the thrust rod (4121) is horizontal; The elastic member (4122) is sleeved outside the thrust rod (4121), and two ends are clamped between the rotating bracket (411) and the thrust rod (4121). The thrust rod (4121) is used to adjust the deformation of the elastic member (4122).

5. The knuckle boom crane according to claim 3, characterized in that: The rotating bracket (411) comprises a rotating plate (4111) and a pressing roller (4112); the rotating plate (4111) is rotatably connected to the first vertical telescopic arm (311) via the rotating shaft (413); The clamping roller (4112) is located between the rotating plate (4111) and the second vertical telescopic arm (312), and the clamping roller (4112) is rotatably connected to the rotating plate (4111), and the clamping roller (4112) is at least partially located inside the first vertical telescopic arm (311), and the clamping roller (4112) is used for sliding contact with the second vertical telescopic arm (312).

6. The knuckle boom crane according to claim 2, characterized in that: 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 one to one with the plurality of second vertical telescopic arms (312), the second roller (332) in each of the second roller groups is located inside 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 rotatably connected to the corresponding second vertical telescopic arm (312); The clamping assembly (4) comprises a plurality of second clamping units (42), and the plurality of second clamping units (42) correspond one-to-one to the plurality of second vertical telescopic arms (312) and the plurality of second roller groups, respectively; In two adjacent vertical telescopic arms (31), the second clamping unit (42) is located at the top end of the corresponding second vertical telescopic arm (312) and is rotationally connected to the corresponding second vertical telescopic arm (312), and the second clamping 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) and the second roller (332) are in contact with each other.

7. The knuckle boom crane according to claim 6, characterized in that: The second roller (332) and the corresponding first pressing unit (41) are respectively located on opposite sides of the axial 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).

8. The knuckle boom crane according to any one of claims 1 to 7, characterized in that: The vertical arm (3) further comprises a plurality of vertical telescopic drive members (34), wherein the plurality of vertical telescopic drive members (34) correspond one-to-one to the plurality of second vertical telescopic arms (312), a fixed end of the vertical telescopic drive member (34) is connected to the first vertical telescopic arm (311) of the outer layer adjacent to the corresponding second vertical telescopic arm (312), and the other end of the vertical telescopic drive member (34) is connected to the corresponding second vertical telescopic arm (312), and the vertical telescopic drive member (34) can be telescoped in the vertical direction.

9. The knuckle boom crane according to any one of claims 1 to 7, characterized in that: The folding arm crane further comprises a first luffing cylinder (5) and a second luffing cylinder (6), wherein two ends of the first luffing cylinder (5) are respectively hinged to the horizontal arm (2) and the base (1), and two ends of the second luffing cylinder (6) are respectively hinged to the vertical arm (3) and the horizontal arm (2).

10. The knuckle boom crane according to any one of claims 1 to 7, characterized in that: The base (1) comprises a base (11), a slewing bearing (12) and a turntable (13); the turntable (13) is rotatably connected to the base (1) via the slewing bearing (12); and the turntable (13) is hinged to the horizontal arm (2).

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