Folding arm crane with mounting structure

Abstract

The utility model relates to the technical field of folding arm cranes, in particular to a folding arm crane with a mounting structure, which aims at solving the technical problem of overcoming the mounting defects of a suspension arm and a base in the prior art and is mainly realized through the following technical scheme. Comprising a mounting arm, a first folding arm and a second folding arm which are sequentially hinged, the first folding arm is further connected with a hoisting winch with a winch rope, the connecting base is arranged at the bottom of the mounting arm and hinged to the mounting arm, and the connecting base comprises a base body, a connecting base and base supporting legs. The connecting rack comprises a first rack and a second rack, the connecting base is arranged, so that the mounting stability is ensured, the overall mass is reduced, the use of the folding arm crane is not influenced, the connecting rack is arranged to realize the stable connection of the suspension arm part, the structural fracture caused by local shearing force or torsion during the hoisting work is avoided, and the practical safety of the suspension arm is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of folding arm cranes, in particular to a folding arm crane with a mounting structure. Background Art

[0002] Folding arm crane is an important lifting equipment in modern industry and plays a major role in the installation and lifting of industrial equipment. Folding arm crane consists of a lifting arm, a turntable, a frame and legs. The mechanical movement of the crane is achieved through the actions of mechanisms such as luffing, telescoping, hoisting and rotation, and the vertical transportation and short-distance horizontal transportation of heavy objects are achieved through the combination of different actions.

[0003] When the folding arm cranes in the prior art are in use, most of them are directly fixed and installed in the required position to carry out the lifting work. However, due to the high overall height of the crane and the long length of the boom, the forces generated between the boom and the connecting arm, and between the boom and the base during lifting are relatively large, resulting in large local shear force or torsion force, which poses a safety hazard. In order to ensure even force, the mass of the base will be increased, but the excessive mass of the base will lead to inconvenience in installation, and excessive pressure will be generated on the installation end during use, affecting the stability of use, and it is difficult to balance the lifting force and the installation stability force. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects of the installation of the boom and the base in the prior art, thereby providing a folding arm crane with a mounting structure.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A folding arm crane with a mounting structure comprises a mounting arm, a first folding arm and a second folding arm which are hingedly arranged in sequence, a hoisting winch is further connected to the first folding arm on a side away from the second folding arm, a winch rope is wound around the hoisting winch, and further comprises:

[0007] A connecting base, the connecting base is arranged at the bottom of the mounting arm and is hingedly arranged with the mounting arm, the connecting base comprises a base body, a connecting base and a base support foot, the base body is provided with a plurality of mounting holes, the connecting base is positioned and rotatably installed above the base body, the base support foot array is arranged at the four corners of the base body and extends away from the center of the base body, the base body and the base support foot piece are further provided with a reinforcing plate, the reinforcing plate is symmetrically arranged on both sides of the base support foot and the adjacent two side edges are respectively welded and fixed to the side wall of the base body and the side wall of the base support foot;

[0008] A connecting frame, the connecting frame includes two first frames connecting the mounting arm and the first folding arm and two second frames connecting the first folding arm and the second folding arm, the first frame is arranged on opposite sides of the mounting arm, one end of the first frame is fixed to the outside of the side wall of the mounting arm close to the top, and the other end is hinged to the outer side wall of the first folding arm, the second frame is arranged on opposite sides of the first folding arm, one end of the second frame is fixed to one end of the first folding arm away from the mounting arm, and the other end is hinged to the outer side wall of the second folding arm.

[0009] By adopting the above technical solution, a connecting base is provided to install the bottom of the folding arm crane, and the base body and the connecting base rotate relative to each other to realize the rotary motion of the folding arm crane. The base support feet increase the overall installation firmness of the base body, and the connecting base is connected to the mounting arm and ensures that the mounting arm is stable during movement. The connecting base reduces the overall mass while ensuring the stability of the installation and does not affect the use of the folding arm crane. In order to improve the safety of use, a counterweight can be placed in the groove formed by the reinforcement plate to increase the stability of the bottom; a connecting frame is provided to achieve stable connection of the boom parts, avoid structural fracture caused by local shear force or torsion during lifting work, and improve the practical safety of the boom.

[0010] Furthermore, a first accommodating groove is provided in the mounting arm, a first telescopic cylinder is arranged in the first accommodating groove, the bottom of the first telescopic cylinder is hingedly installed at the bottom of the first accommodating groove, and the output shaft of the first telescopic cylinder is hingedly arranged to the bottom of one end of the first folding arm; a second accommodating groove is provided at one end of the first folding arm close to the second folding arm, a second telescopic cylinder is arranged in the second accommodating groove, one end of the second telescopic cylinder is hinged to the second accommodating groove, and the output shaft of the second telescopic cylinder is hingedly arranged to one end of the second folding arm.

[0011] By adopting the above technical solution, a first telescopic rod is set to drive the first folding arm to move relative to the installation arm, and a second telescopic cylinder is set to drive the second folding arm to move relative to the first folding arm, so as to control the adjustment and rotation of the two folding arms and increase the lifting range of the folding arm crane.

[0012] Furthermore, the base support leg includes an extension rod and a fixed plate, one end of the extension rod is fixed to the base body, and the other end is connected to the fixed plate, the height of the extension rod close to the base body is greater than the height of the side away from the base body, the fixed plate includes a plate body and multiple support plates, the bottom surface of the plate body and the lower bottom surface of the extension rod are in the same horizontal plane, the support plate is welded and fixed to the plate body and connects the plate body and the extension rod, the fixed plate also includes an extension plate, the extension plate is arranged on the outside of the plate body and connected to the side wall of the extension rod.

[0013] By adopting the above technical solution, an extension rod and a fixing plate are provided to increase the bottom area of ​​the installation structure, making the bottom installation more secure and making the bottom fit the ground to lower the overall center of gravity, thereby achieving force dispersion and avoiding excessive local pressure.

[0014] Furthermore, the connecting base includes a first base plate, a second base plate and two fixed plates, the first base plate is clamped and arranged above the second base plate, a plurality of screw holes are arranged on the first base plate and the second base plate, the fixed plates are symmetrically arranged between the first base plate and the second base plate, a waist-shaped weight-reducing hole is opened in the middle of the fixed plates, and a rotary drive is arranged on the outer side of the second base plate, and the rotary drive is fixed on the base body.

[0015] By adopting the above technical solution, a fixing plate is provided after the first base plate and the second base plate are clamped and fixed to increase the fixation between the two, thereby ensuring that the first base plate and the second base plate are subjected to uniform force and avoiding deformation of the structural parts. Weight-reducing holes are provided on the fixing plate to reduce the weight of the structural parts without affecting the fixed connection, thereby reducing the overall mass of the device and facilitating subsequent disassembly and installation.

[0016] Furthermore, a fixing part is provided on the base body, and the fixing part is arranged in a circular array along the connecting base. The fixing part includes a fixing block fixed on the base body and a lifting rod vertically slidably arranged on the fixing block. A tightening block is extended from the lower bottom surface of the lifting rod, and the first base plate is correspondingly provided with an annular tightening groove.

[0017] By adopting the above technical solution, the fixing part is arranged to rotate into place when the connecting base is connected, and the lifting rod drives the clamping block to descend and be clamped and fixed with the clamping groove, so that the folding arm crane can be positioned and the rotational movement is reduced during the positioning operation; and when the folding arm crane needs to adjust the rotation, the fixing part can also be raised without affecting the rotation adjustment angle.

[0018] Furthermore, the connecting base also includes a connecting frame, which is U-shaped and has an opening upward. The side walls at both ends of the top of the connecting frame are provided with axial holes. The axial holes are clamped with an axial reinforcement structure, and the axial reinforcement structure is a connecting shaft seat with a diameter larger than the axial hole.

[0019] By adopting the above technical solution, the connecting frame is used to install the connecting mounting arm, ensuring the stable connection and installation at the bottom of the mounting arm, and the connecting shaft seat increases the strength of the bottom shaft end and reduces damage to the shaft end.

[0020] Furthermore, a plurality of welding holes are provided on the side of one end of the first frame close to the mounting arm, and a plurality of first limiting plates and a first reinforcing plate are connected between the two first frames, and the first reinforcing plate is arranged along the width direction of the first frame and has a length less than the width of the first bracket; a plurality of welding holes are also provided on one end of the second frame close to the first folding arm, and a plurality of second limiting plates and a second reinforcing plate are connected between the two second frames, and the second reinforcing plate is arranged along the width direction of the second frame and has a length less than the width of the second bracket.

[0021] By adopting the above technical solution, after the first frame and the mounting arm are welded and fixed, the first limit plate and the first reinforcement plate are added, the welding area between the first frames is increased, thereby increasing the overall welding strength and improving the strength of the connection part. The setting of the limit plate can also prevent the first folding arm from excessively rotating relative to the mounting arm. Similarly, after the second frame and the mounting arm are welded and fixed, the second limit plate and the second reinforcement plate are added, the welding area between the second frames is increased, the strength of the connection part is improved, and the structural stability is effectively improved. This avoids the generation of large local shear force or torsion during the lifting of the folding arm crane, thereby reducing the possibility of structural damage.

[0022] Furthermore, the first folding arm and the second folding arm are also provided with a guide structure corresponding to the lifting winch, and the guide structure includes guide wheels arranged in pairs, and the guide wheels are positioned and rotatably installed on the first folding arm and the second folding arm. A guide groove is opened in the middle of the outer circumferential surface of the guide wheel, and a winch rope is passed through the guide groove.

[0023] By adopting the above technical solution, a guide structure is set for limiting, the guide wheels are relatively set and the winch rope is clamped up and down to reduce shaking during subsequent lifting, and the structure is ensured to be stable, avoiding rope slippage and achieving smooth lifting, effectively improving operational safety.

[0024] In summary, the technical solution of the utility model has the following advantages:

[0025] 1. The utility model provides a folding arm crane with a mounting structure, and a connecting base is provided to mount the bottom of the folding arm crane. The base body and the connecting base rotate relative to each other to realize the rotary motion of the folding arm crane. The base support feet increase the overall mounting firmness of the base body. The connecting base is connected to the mounting arm and ensures that the mounting arm is stable during movement. The connecting base reduces the overall mass while ensuring the stability of the installation and does not affect the use of the folding arm crane.

[0026] 2. The folding arm crane with a mounting structure provided by the utility model is provided with a connecting frame to achieve stable connection of the boom parts, avoid structural fracture caused by local shear force or torsion during lifting work, and improve the practical safety of the boom.

[0027] 3. The folding arm crane with an installation structure provided by the utility model is provided with a guide structure for limiting the position. The guide wheels are relatively arranged and the winch rope is clamped up and down to reduce the shaking during subsequent lifting, and also ensure the stability of the structure, avoid the rope from falling off, and achieve smooth lifting, effectively improving the operational safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of a knuckle boom crane with a mounting structure provided in one embodiment of the utility model;

[0030] Figure 2 It is a bottom-up structural schematic diagram of a knuckle boom crane with a mounting structure provided in one embodiment of the utility model;

[0031] Figure 3 A schematic cross-sectional view of a folding arm crane with a mounting structure provided in one embodiment of the utility model;

[0032] Figure 4 A schematic diagram of a top view of a connecting base provided in one embodiment of the utility model;

[0033] Figure 5 The exploded structure diagram of the connection base provided in one embodiment of the utility model.

[0034] Description of reference numerals:

[0035] 1. Mounting arm; 11. First receiving groove; 111. First telescopic cylinder; 2. First folding arm; 21. Second receiving groove; 211. Second telescopic cylinder; 3. Second folding arm; 4. Connecting base; 5. Base body; 51. Mounting hole; 52. Reinforcement plate; 53. Fixing piece; 531. Fixing block; 532. Lifting rod; 5321. Tightening block; 6. Connecting base; 61. First base plate; 611. Tightening groove; 62. Second base plate; 621. Rotation drive; 63. Fixing plate; 6 31. Weight-reducing hole; 64. Connecting frame; 641. Axis hole; 6411. Axis reinforcement structure; 7. Base support; 71. Extension rod; 72. Fixed plate; 721. Plate body; 722. Support plate; 723. Extension plate; 8. Connecting frame; 81. First frame; 811. First limit plate; 812. First reinforcement plate; 82. Second frame; 821. Second limit plate; 822. Second reinforcement plate; 83. Welding hole; 9. Guide structure; 91. Guide wheel; 911. Guide groove. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] A folding arm crane with a mounting structure, such as Figure 1 As shown, a folding arm crane with a mounting structure comprises a mounting arm 1, a first folding arm 2 and a second folding arm 3 which are hingedly arranged in sequence. A lifting winch with a winch rope is also connected to the first folding arm 2. The winch rope (not shown in the figure) is led out from the lifting winch and extends to the second folding arm 3 through the upper side of the first folding arm 2. It also comprises a connecting base 4 and a connecting frame 8. The connecting base 4 is arranged at the bottom of the mounting arm 1 and is hingedly arranged with the mounting arm 1. The connecting base 4 comprises a base body 5, a connecting base 6 and a base support leg 7. A plurality of penetrating mounting holes 51 are arranged in an array around the upper surface of the base body 5. The connecting base 6 is positioned and rotatably installed above the base body 5. The base support leg 7 is arranged in an array at the four corners of the base body 5 and extends away from the center of the base body 5. The connecting frame 8 includes a first frame 81 and a second frame 82. The first frame 81 is arranged on two opposite sides of the mounting arm 1. One end of the first frame 81 is fixed to the outside of the side wall of the mounting arm 1 near the top, and the other end is hinged to the outer side wall of the first folding arm 2. The second frame 82 is arranged on two opposite sides of the first folding arm 2. One end of the second frame 82 is fixed to one end of the first folding arm 2 away from the mounting arm 1, and the other end is hinged to the outer side wall of the second folding arm 3. The connection base 4 is arranged to reduce the overall mass while ensuring stable installation, and does not affect the use of the folding arm crane. The connection frame 8 is arranged to achieve stable connection of the boom parts, avoid structural fracture caused by local shear force or torsion during lifting work, and improve the practical safety of the boom.

[0038] The base body 5 and the base legs 7 are also provided with reinforcing plates 52, which are symmetrically arranged on both sides of the base legs 7 and the adjacent two sides are respectively welded and fixed to the side walls of the base body 5 and the side walls of the base legs 7. A counterweight can be placed in the groove formed by the reinforcing plate 52 to increase the stability of the bottom.

[0039] The first folding arm 2 and the second folding arm 3 are also provided with a plurality of guide structures 9 corresponding to the hoisting winches. The guide structures 9 include guide wheels 91 arranged in pairs. The guide wheels 91 are respectively positioned and rotatably installed on the first folding arm 2 and the second folding arm 3. A guide groove 911 is provided in the middle of the outer circumference of the guide wheel 91. A winch rope is passed through the guide groove 911. The guide structure 9 is provided for limiting, and the guide wheels 91 are relatively arranged and clamp the winch rope up and down, which reduces the shaking during subsequent lifting, ensures the stability of the structure, avoids the rope from falling off, and realizes stable lifting, effectively improving the safety of operation.

[0040] like Figure 1 and Figure 2As shown, a first receiving groove 11 is provided in the mounting arm 1, a first telescopic cylinder 111 is arranged in the first receiving groove 11, the bottom of the first telescopic cylinder 111 is hingedly installed at the bottom of the first receiving groove 11, and the output shaft of the first telescopic cylinder 111 is hingedly arranged at the bottom of one end of the first folding arm 2. A second receiving groove 21 is provided at one end of the first folding arm 2 close to the second folding arm 3, a second telescopic cylinder 211 is arranged in the second receiving groove 21, one end of the second telescopic cylinder 211 is hingedly arranged with the second receiving groove 21, and the output shaft of the second telescopic cylinder 211 is hingedly arranged with one end of the second folding arm 3. The first telescopic cylinder 111 and the second telescopic cylinder 211 are driven by oil cylinders or air cylinders to control the movement of the corresponding folding arms, a first telescopic rod is arranged to drive the first folding arm 2 to move relative to the mounting arm 1, and a second telescopic cylinder 211 is arranged to drive the second folding arm 3 to move relative to the first folding arm 2, so as to control the adjustment and rotation of the two folding arms and increase the hoisting range of the folding arm crane.

[0041] like Figure 1 , Figure 4 and Figure 5 As shown, the base support leg 7 includes an extension rod 71 and a fixed plate 72, one end of the extension rod 71 is fixed on the base body 5, and the other end is connected to the fixed plate 72, the height of the side of the extension rod 71 close to the base body 5 is greater than the height of the side away from the base body 5, the fixed plate 72 includes a plate body 721 and a plurality of support plates 722, the bottom surface of the plate body 721 and the bottom surface of the extension rod 71 are in the same horizontal plane, the support plate 722 is welded and fixed on the plate body 721 and connects the plate body 721 and the extension rod 71, and the fixed plate 72 also includes an extension plate 723, which is arranged on the outside of the plate body 721 and connected to the side wall of the extension rod 71. The extension rod 71 and the fixed plate 72 are arranged to increase the bottom area of ​​the installation structure, so that the bottom installation is more firm and the bottom is close to the ground to reduce the overall center of gravity, so as to achieve force dispersion and avoid excessive local pressure.

[0042] The connecting base 6 includes a first base plate 61, a second base plate 62 and two fixing plates 63. The first base plate 61 is clamped and arranged above the second base plate 62. The first base plate 61 and the second base plate 62 are both provided with a plurality of screw holes, and the screw holes fix the first base plate 61 and the second base plate 62. The fixing plate 63 is symmetrically arranged between the first base plate 61 and the second base plate 62. A waist-shaped weight-reducing hole 631 is provided in the middle of the fixing plate 63. A rotary drive 621 is provided on the outer side of the second base plate 62, and the rotary drive 621 is fixed on the base body 5. After the first base plate 61 and the second base plate 62 are clamped and fixed, the fixing plate 63 is provided to increase the fixation between the two, ensure that the first base plate 61 and the second base plate 62 are evenly stressed, and avoid deformation of the structural parts. The weight-reducing holes 631 are provided on the fixing plate 63 to reduce the weight of the structural parts without affecting the fixed connection, reduce the overall mass of the device, and facilitate subsequent disassembly and installation.

[0043] The base body 5 is also provided with a fixing member 53, which is arranged in an array along the circumference of the connecting base 6. The fixing member 53 includes a fixing block 531 fixed on the base body 5 and a lifting rod 532 vertically slidingly arranged on the fixing block 531. A tightening block 5321 is extended from the bottom surface of the lifting rod 532. The tightening block 5321 is a trapezoidal block with a smaller bottom area than the top. The first base plate 61 is correspondingly provided with an annular tightening groove 611. When the fixing member 53 is set and the connecting base 6 is rotated into place and needs to be fixed, the lifting rod 532 drives the tightening block 5321 to descend and tighten with the tightening groove 611, so that the folding arm crane can be positioned and the rotation movement is reduced during the positioning operation; and when the folding arm crane needs to adjust the rotation, the fixing member 53 can also be raised without affecting the rotation adjustment angle.

[0044] The connection base 6 also includes a connection frame 64, which is U-shaped and has an opening facing upward. The side walls at both ends of the top of the connection frame 64 are provided with shaft holes 641, and a shaft reinforcement structure 6411 is provided at the shaft hole 641. The shaft reinforcement structure 6411 is a connection shaft seat with a diameter larger than the shaft hole 641. The connection frame 64 is used to install and connect the mounting arm 1 to ensure that the bottom connection and installation of the mounting arm 1 is stable. The connection shaft seat increases the strength of the bottom shaft end and reduces damage to the shaft end.

[0045] like Figure 2 and Figure 3 As shown, a plurality of welding holes 83 are provided on the side of one end of the first frame 81 close to the mounting arm 1, and a plurality of first limit plates 811 and a first reinforcing plate 812 are connected between the two first frames 81. The first reinforcing plate 812 is arranged along the width direction of the first frame 81 and its length is less than the width of the first bracket. After the first frame 81 is welded and fixed to the mounting arm 1, the first limit plate 811 and the first reinforcing plate 812 are added to increase the welding area between the first frames 81, thereby increasing the overall welding strength and improving the strength of the connection part. The setting of the limit plate can also prevent the first folding arm 2 from excessively rotating relative to the mounting arm 1. A plurality of welding holes 83 are also provided on the end of the second frame 82 close to the first folding arm 2, and a plurality of second limit plates 821 and a second reinforcing plate 822 are connected between the two second frames 82. The second reinforcing plate 822 is arranged along the width direction of the second frame 82 and its length is less than the width of the second bracket. Similarly, after the second frame 82 is welded and fixed to the mounting arm 1, the second limit plate 821 and the second reinforcing plate 822 are added, so as to increase the welding area between the second frame 82, enhance the strength of the connection part, and effectively improve the structural stability; avoid the generation of large local shear force or torsion during the lifting of the folding arm crane, and reduce the possibility of structural damage.

[0046] The working principle and use method of the folding arm crane with mounting structure are as follows: base legs 7 extend outward from the four corners of the base body 5, the base legs 7 include an extension rod 71 fixed to the base body 5 and a fixed plate 72 arranged at the end of the extension rod 71, the fixed plate 72 and the extension rod 71 are reinforced by a support plate 722 and an extension plate 723, the extension rod 71 and the base body 5 are also connected by a reinforcement plate 52, the first base plate 61 and the second base plate 62 are positioned and rotatably screwed on the base body 5, the first base plate 61 and the second base plate 62 are reinforced by a fixed plate 63, a connecting frame 64 is fixed above the first base plate 61, the connecting frame 64 is hinged to the mounting arm 1, the mounting arm 1 is also hinged to the first folding arm 2, and the first folding arm 2 is hinged to the second folding arm 3; the mounting arm 1, the first folding arm 2 and the second folding arm 3 are connected and reinforced by a connecting frame 8, and a guide structure 9 is also provided on the first folding arm 2 and the second folding arm 3 for guidance.

[0047] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A folding arm crane with a mounting structure, comprising a mounting arm (1), a first folding arm (2) and a second folding arm (3) which are hingedly arranged in sequence, wherein a hoisting winch is connected to the first folding arm (2) on a side away from the second folding arm (3), and a winch rope is wound around the hoisting winch, characterized in that: Also includes: A connecting base (4), the connecting base (4) is arranged at the bottom of the mounting arm (1) and is hinged to the mounting arm (1), the connecting base (4) comprises a base body (5), a connecting base (6) and a base support foot (7), the base body (5) is provided with a plurality of mounting holes (51), the connecting base (6) is positioned and rotatably mounted above the base body (5), the base support foot (7) is arranged in an array at the four corners of the base body (5) and extends away from the center of the base body (5), the base body (5) and the base support foot (7) are also provided with a reinforcing plate (52), the reinforcing plate (52) is symmetrically arranged on both sides of the base support foot (7) and the adjacent two side edges are respectively welded and fixed to the side wall of the base body (5) and the side wall of the base support foot (7); A connecting frame (8), the connecting frame (8) comprising two first frames (81) connecting the mounting arm (1) and the first folding arm (2) and two second frames (82) connecting the first folding arm (2) and the second folding arm (3), the first frame (81) being arranged on opposite sides of the mounting arm (1), one end of the first frame (81) being fixed to the outside of the side wall of the mounting arm (1) close to the top, and the other end being hinged to the outer side wall of the first folding arm (2), the second frame (82) being arranged on opposite sides of the first folding arm (2), one end of the second frame (82) being fixed to one end of the first folding arm (2) away from the mounting arm (1), and the other end being hinged to the outer side wall of the second folding arm (3).

2. A folding arm crane with a mounting structure according to claim 1, characterized in that: A first receiving groove (11) is provided in the mounting arm (1), a first telescopic cylinder (111) is arranged in the first receiving groove (11), the bottom of the first telescopic cylinder (111) is hingedly mounted on the bottom of the first receiving groove (11), and the output shaft of the first telescopic cylinder (111) is hingedly arranged on the bottom of one end of the first folding arm (2); a second receiving groove (21) is provided at one end of the first folding arm (2) close to the second folding arm (3), a second telescopic cylinder (211) is arranged in the second receiving groove (21), one end of the second telescopic cylinder (211) is hingedly arranged on the second receiving groove (21), and the output shaft of the second telescopic cylinder (211) is hingedly arranged on one end of the second folding arm (3).

3. A folding arm crane with a mounting structure according to claim 1, characterized in that: The base support leg (7) comprises an extension rod (71) and a fixed plate (72); one end of the extension rod (71) is fixed on the base body (5), and the other end is connected to the fixed plate (72); the height of the side of the extension rod (71) close to the base body (5) is greater than the height of the side away from the base body (5); the fixed plate (72) comprises a plate body (721) and a plurality of support plates (722); the bottom surface of the plate body (721) and the bottom surface of the extension rod (71) are in the same horizontal plane; the support plates (722) are welded and fixed on the plate body (721) and connect the plate body (721) and the extension rod (71); the fixed plate (72) further comprises an extension plate (723); the extension plate (723) is arranged on the outside of the plate body (721) and connected to the side wall of the extension rod (71).

4. A folding arm crane with a mounting structure according to claim 3, characterized in that: The connecting base (6) comprises a first base plate (61), a second base plate (62) and two fixing plates (63); the first base plate (61) is clamped and arranged above the second base plate (62); a plurality of screw holes are arranged on the first base plate (61) and the second base plate (62); the fixing plates (63) are symmetrically arranged between the first base plate (61) and the second base plate (62); a waist-shaped weight-reducing hole (631) is opened in the middle of the fixing plates (63); a rotary drive (621) is arranged on the outer side of the second base plate (62); and the rotary drive (621) is fixed on the base body (5).

5. A folding arm crane with a mounting structure according to claim 4, characterized in that: The base body (5) is also provided with a fixing member (53), and the fixing member (53) is arranged in a circular array along the connection base (6). The fixing member (53) comprises a fixing block (531) fixed on the base body (5) and a lifting rod (532) vertically slidably arranged on the fixing block (531), and a tightening block (5321) is extended from the bottom surface of the lifting rod (532), and the first base plate (61) is correspondingly provided with an annular tightening groove (611).

6. A folding arm crane with a mounting structure according to claim 5, characterized in that: The connecting base (6) further comprises a connecting frame (64), the connecting frame (64) being U-shaped and opening upward, the side walls at both ends of the top of the connecting frame (64) being provided with shaft holes (641), the shaft holes (641) being provided with shaft reinforcement structures (6411) in a clamping manner, and the shaft reinforcement structures (6411) being connecting shaft seats having a diameter larger than the shaft holes (641).

7. A folding arm crane with a mounting structure according to claim 1, characterized in that: A plurality of welding holes (83) are provided on the side surface of one end of the first frame (81) close to the mounting arm (1); a plurality of first limiting plates (811) and a first reinforcing plate (812) are also connected between the two first frames (81); the first reinforcing plate (812) is arranged along the width direction of the first frame (81) and has a length less than the width of the first frame (81); a plurality of welding holes (83) are also provided on the end of the second frame (82) close to the first folding arm (2); a plurality of second limiting plates (821) and a second reinforcing plate (822) are connected between the two second frames (82); the second reinforcing plate (822) is arranged along the width direction of the second frame (82) and has a length less than the width of the second frame (82).

8. The knuckle boom crane with a mounting structure according to claim 1, characterized in that: The first folding arm (2) and the second folding arm (3) are also provided with a guide structure (9) corresponding to the lifting winch. The guide structure (9) includes a pair of guide wheels (91). The guide wheels (91) are rotatably mounted on the first folding arm (2) and the second folding arm (3). A guide groove (911) is provided in the middle of the outer circumference of the guide wheel (91), and a winch rope is passed through the guide groove (911).

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