Long cantilever beam lifting device

Abstract

The present invention belongs to the technical field of hoisting equipment, and specifically is a long cantilever beam lifting device, including a base mechanism, a column mechanism, a boom mechanism and a traction mechanism. In order to solve the problem of the risk of overturning of the existing lifting device during the lifting and rotation process, the present invention adopts a method of lowering the center of gravity of the attached center to improve the stability, and sets a column mechanism. By carrying the boom load on the column mechanism, and then connecting the boom load with the boom mechanism, while ensuring the stability of the boom mechanism, the center of gravity of the equipment is lowered, and the load of the equipment is nested with the column mechanism, which can not only effectively reduce the overall size, but also improve the stability during lifting; in addition, by carrying an angular momentum balancing device on the boom mechanism, the left balance wheel and the right balance wheel are driven to rotate, and the stability of the boom mechanism is improved by the angular momentum generated by the rotation, and the shaking caused by the goods during lifting and moving is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of hoisting equipment, and in particular relates to a long cantilever beam lifting device. Background Art

[0002] Cantilever cranes mainly use the width (pitch) of the boom to rotate around the vertical axis to lift and lower goods. They are flexible to use and meet the requirements of loading and unloading. They are available in fixed, mobile and floating types. Fixed cantilever cranes are directly installed on the piers of the dock or warehouse and can only work in situ. Some of the booms can only pitch but not rotate, while some can pitch and rotate. Mobile boom cranes can run along tracks or on the ground. They are mainly truck cranes, tire cranes, crawler cranes and portal cranes. Among them, tire cranes and portal cranes are widely used in ports. Truck, tire, crawler and other mobile cranes are also called automatic cranes. Floating heavy cranes are cantilever cranes installed on special flat-bottomed boats. They are widely used in loading and unloading of sea and river ports and port construction.

[0003] In order to maintain balance, existing lifting devices carry loads on a horizontal boom, which results in a higher center of gravity for the lifting device. During the lifting process, the movement of the cargo will cause the center of gravity of the lifting device to shift, causing the equipment to shake and easily overturn. Secondly, during the rotation of the lifting device, since the center of gravity is too high and the base of the traditional lifting device is not wide enough or has insufficient support, it is more likely to lose balance, and the risk of the entire device overturning will also increase. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a long cantilever beam lifting device. In order to solve the problem of the risk of overturning of the existing lifting device during lifting and rotation, the present invention adopts the method of lowering the center of gravity of the load to improve the stability, and sets a column mechanism. By carrying the boom load on the column mechanism, and then connecting the boom load with the boom mechanism, the center of gravity of the equipment is lowered while ensuring the stability of the boom mechanism. At the same time, the load of the equipment is nested with the column mechanism, which can not only effectively reduce the overall size, but also improve the stability during lifting. In addition, by carrying an angular momentum balancing device on the boom mechanism, the left balance wheel and the right balance wheel are driven to rotate, and the stability of the boom mechanism is improved by the angular momentum generated by the rotation, thereby reducing the shaking of the goods during lifting and moving.

[0005] The technical solution adopted by the present invention is as follows: The present invention provides a long cantilever beam lifting device, including a base mechanism, a column mechanism, an arm mechanism and a traction mechanism, the base mechanism is installed on the ground, the lower end of the column mechanism is transmission connected to the base mechanism, the arm mechanism is arranged at the upper end of the column mechanism, and the traction mechanism is slidably arranged on the arm mechanism, the base mechanism is used to fix the main structure, the column mechanism is used to provide load and improve the stability of the main body during rotation, and the arm mechanism is the main carrying mechanism, which is used to carry the traction mechanism and perform lifting through the traction mechanism.

[0006] Among them, the base mechanism includes a fixed chassis, a docking base and a rotating gear ring. The fixed chassis is installed on the ground, the docking base is arranged above the fixed chassis, and the rotating gear ring is arranged on the top of the docking base, relying on the fixed chassis to improve the stability of the base mechanism.

[0007] As a further preferred embodiment of the present invention, inner core foundation piles are provided on the fixed chassis, and the bottom ends of the inner core foundation piles extend deep into the ground, so as to improve the bearing capacity of the base mechanism by utilizing the inner core foundation piles.

[0008] Furthermore, the column mechanism includes a weight-bearing outer arm, a rotating mounting plate, a rotating motor and a rotating gear. The weight-bearing outer arm is sleeved on the outside of the inner core foundation pile, and the bottom end of the weight-bearing outer arm is also rotatably connected to the bottom of the inner core foundation pile. The rotating mounting plate is arranged on the weight-bearing outer arm, the rotating motor is arranged on the rotating mounting plate, and the rotating gear is arranged on the output end of the rotating motor.

[0009] As a further preferred embodiment of the present invention, the rotating gear is meshedly connected with a rotating gear ring, the rotating motor drives the rotating gear to rotate, and the column mechanism is controlled to rotate by the rotating motor to realize the rotation lifting of the lifting device.

[0010] As a further preferred embodiment of the present invention, a boom weight is provided on the load-bearing outer arm, which is the main weight of the column mechanism and can effectively lower the center of gravity of the equipment. The lower center of gravity makes the equipment more stable when lifting and moving heavy objects, reduces the risk of shaking and overturning, and improves the safety of the operator and surrounding personnel. At the same time, the lower center of gravity makes the equipment more flexible during lifting, reduces the need for additional adjustments due to the high center of gravity, and improves the accuracy and efficiency of the operation.

[0011] Furthermore, the boom mechanism includes a boom base, a sliding arm docking shaft, a load-bearing docking shaft, a carrying boom and a load-bearing boom, the boom base is arranged at the top of the column mechanism, the sliding arm docking shaft is arranged at the middle of the boom base, the load-bearing docking shaft is arranged at the top of the boom base, symmetrical carrying booms are rotatably provided at both ends of the sliding arm docking shaft, and a load-bearing boom is rotatably provided on the load-bearing docking shaft.

[0012] Furthermore, a top isotropic axis is provided at one end of the load-bearing boom, and a bottom isotropic axis is provided at one end of the carrying boom. A linkage limit arm is rotatably connected to the top isotropic axis, and the lower end of the linkage limit arm is rotatably connected to the bottom isotropic axis. The load-bearing boom, the carrying boom, the linkage limit arm and the boom base together form a quadrilateral structure, which allows the load-bearing boom and the carrying boom to be subjected to force synchronously during lifting, and the load-bearing boom and the carrying boom can respectively assume the functions of load-bearing and stability, and the load is evenly distributed on the load-bearing boom and the carrying boom, which can reduce the stress concentration of a single boom, thereby improving the safety of the entire system, and the natural characteristics of the quadrilateral structure enable the system to maintain dynamic stability during movement, so that under the action of external force or disturbance, the structure can still maintain its shape to prevent shaking or instability.

[0013] As a further preferred embodiment of the present invention, an angular momentum balancing device is provided at the other end of the carrying boom, and the angular momentum balancing device comprises a right rotating shaft, a right balancing wheel, a right transmission gear disc, a left transmission gear disc, a left rotating shaft, a left balancing wheel, a balancing gear disc and a balancing motor. The right rotating shaft is rotatably arranged at the other end of one group of carrying booms, and the left rotating shaft is rotatably arranged at the other end of another group of carrying booms. The right rotating shaft is rotatably connected to the left rotating shaft at the same time. The right balancing wheel is arranged at the outer end of the right rotating shaft, the right transmission gear disc is arranged on the right rotating shaft, the left balancing wheel is arranged on one end of the left rotating shaft, and the left transmission gear disc is arranged on the other end of the left rotating shaft. The balancing motor is arranged above the carrying boom, and the balancing gear disc is arranged on the output end of the balancing motor. The balance gear plate is meshed and connected with the left balance wheel, and the balance gear plate is meshed and connected with the right balance wheel at the same time. During the rotation of the left balance wheel and the right balance wheel, due to the law of conservation of angular momentum (in the absence of external torque, the angular momentum of the object remains unchanged, and the rotating object tends to keep the direction of its rotation axis unchanged) and the gyro effect (when a rotating object is subjected to an external torque, its rotation axis will produce precession (that is, the rotation axis itself rotates around another axis) instead of changing direction immediately), an angular momentum in the opposite direction is provided to the axial direction of the left rotation axis (coaxial with the right rotation axis). Due to the conservation of angular momentum, the rotating object will resist changing the direction of its rotation axis when disturbed, thereby improving the stability of the boom mechanism.

[0014] Furthermore, the traction mechanism includes a sliding device and an electric hoist, the sliding device is slidably arranged between two groups of carrying arms, and the electric hoist is arranged below the sliding device.

[0015] Among them, the sliding device includes a main sliding system, a driving unit, a secondary sliding system and a boom connecting arm, the main sliding system is slidably arranged on the carrying boom, the secondary sliding system is slidably arranged on the carrying boom, the driving unit is arranged on the side wall of the main sliding system, one end of the boom connecting arm is fixedly connected to the bottom of the main sliding system, and the other end of the boom connecting arm is fixedly connected to the bottom of the secondary sliding system.

[0016] Among them, the main sliding system includes a sliding cabin, a horizontal pulley and an extrusion pulley. A symmetrical horizontal pulley is rotatably provided in the sliding cabin. The horizontal pulley is in rolling contact with the carrying boom. A symmetrical extrusion pulley is rotatably provided in the sliding cabin. The horizontal pulley is transmission-connected to the output end of the driving unit. The horizontal pulley is mainly used for the main sliding system to slide on the carrying boom. The extrusion pulley is used to limit the sliding cabin, so that the horizontal pulley and the carrying boom can maintain a stable contact area.

[0017] Furthermore, the boom load includes a main load-bearing casting, a side casting, an upper rotating arm, a lower rotating arm and a hydraulic support arm, the main load-bearing casting is arranged on the load-bearing outer arm, one end of the upper rotating arm is rotatably arranged on the main load-bearing casting, the side casting is rotatably connected to the other end of the upper rotating arm, one end of the lower rotating arm is rotatably arranged on the main load-bearing casting, the side casting is rotatably connected to the other end of the lower rotating arm, the fixed end of the hydraulic support arm is rotatably arranged on the main load-bearing casting, the telescopic end of the hydraulic support arm is rotatably connected to the side casting, and when the column mechanism rotates, the side casting is supported by the hydraulic support arm, which increases the rotational torque of the boom load in disguised form, can provide smoother rotational movement, reduce swinging and shaking caused by acceleration, deceleration or sudden change of direction, and help improve the stability and safety of operation.

[0018] As a further preferred embodiment of the present invention, a traction steel cable is provided at the other end of the load-bearing boom, and the traction steel cable is simultaneously connected to the main load-bearing casting, and the traction steel cable is utilized to connect the load-bearing boom and the main load-bearing casting.

[0019] The beneficial effects achieved by the present invention using the above structure are as follows: The beneficial effects of a long cantilever beam lifting device provided by this scheme are as follows:

[0020] (1) In order to solve the problem of the overturning risk of existing lifting devices during lifting and rotation, a column mechanism is set to lower the center of gravity of the equipment, and the load of the equipment is nested with the column mechanism, which can not only effectively reduce the overall size but also improve the stability during lifting;

[0021] (2) Setting the boom load and increasing the rotational torque of the boom load by opening the side castings can provide a smoother rotational movement for the column mechanism, effectively reducing the swing and shaking caused by acceleration, deceleration or sudden change of direction, avoiding the equipment from tipping over during rotation, and improving the stability and safety of operation;

[0022] (3) An angular momentum balancing device is provided to drive the left and right balancing wheels to rotate, thereby providing angular momentum in opposite directions and resisting disturbances that change the direction of the rotation axis, thereby improving the stability of the boom mechanism;

[0023] (4) A boom mechanism is set up, and the load-bearing boom, the carrying boom, the linkage limit arm and the boom base form a quadrilateral structure, which can achieve synchronous force, evenly distribute the load, and improve safety and stability. This design optimizes load distribution, enhances operational accuracy, extends equipment life, and has flexibility and versatility. At the same time, it simplifies design and maintenance and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a long cantilever beam lifting device proposed by the present invention;

[0025] Figure 2 A side view of a long cantilever beam lifting device proposed by the present invention;

[0026] Figure 3 is a structural schematic diagram of the base mechanism;

[0027] Figure 4 It is a structural schematic diagram of the column mechanism;

[0028] Figure 5 It is a structural diagram of the boom load;

[0029] Figure 6 It is a structural schematic diagram of the boom mechanism;

[0030] Figure 7 is a schematic diagram of the structure of the angular momentum balancing device;

[0031] Figure 8 It is a structural schematic diagram of the traction mechanism;

[0032] Fig. 9 Exploded diagram of the main sliding system;

[0033] Fig.10 is a structural schematic diagram of the main sliding system;

[0034] Fig.11 This is the connection diagram of the traction cable.

[0035] Among them, 1. base mechanism, 2. column mechanism, 3. boom mechanism, 4. traction mechanism, 101. fixed chassis, 102. docking base, 103. rotating gear ring, 104. inner core pile, 201. load-bearing outer arm, 202. rotating carrying plate, 203. rotating motor, 204. rotating gear, 205. boom load, 206. main load-bearing casting, 207. side casting, 208. upper rotating arm, 209. lower rotating arm, 210. hydraulic support arm, 301. boom base, 302. sliding arm docking shaft, 303. load-bearing docking shaft, 304. carrying boom, 305. load-bearing boom, 306. top co-axial axis, 307. linkage limit arm, 308. bottom co-axial axis, 309. angular momentum balancing device, 310. right rotating shaft, 311. right balancing wheel, 312. right transmission gear disc, 313. left transmission gear disc, 314. left rotating shaft, 315. left balancing wheel, 316. balancing gear disc, 317. balancing motor, 318. traction cable, 401. sliding device, 402. electric hoist, 403. main sliding system, 404. driving unit, 405. auxiliary sliding system, 406. boom connecting arm, 407. sliding cabin, 408. horizontal pulley, 409. extrusion pulley.

[0036] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0039] like Figure 1-Figure 11 As shown, the present invention provides a long cantilever beam lifting device, including a base mechanism 1, a column mechanism 2, an arm mechanism 3 and a traction mechanism 4, the base mechanism 1 is installed on the ground, the lower end of the column mechanism 2 is transmission-connected to the base mechanism 1, the arm mechanism 3 is arranged at the upper end of the column mechanism 2, and the traction mechanism 4 is slidably arranged on the arm mechanism 3.

[0040] Among them, the base mechanism 1 includes a fixed chassis 101, a docking base 102 and a rotating gear ring 103. The fixed chassis 101 is installed on the ground, the docking base 102 is arranged above the fixed chassis 101, and the rotating gear ring 103 is arranged on the top of the docking base 102; an inner core foundation pile 104 is arranged on the fixed chassis 101, and the bottom end of the inner core foundation pile 104 is deep underground.

[0041] The column mechanism 2 includes a load-bearing outer arm 201, a rotating mounting plate 202, a rotating motor 203 and a rotating gear 204. The load-bearing outer arm 201 is sleeved on the outer side of the inner core pile 104. The bottom end of the load-bearing outer arm 201 is rotatably connected to the bottom of the inner core pile 104. The rotating mounting plate 202 is arranged on the load-bearing outer arm 201, the rotating motor 203 is arranged on the rotating mounting plate 202, and the rotating gear 204 is arranged on the output end of the rotating motor 203; the rotating gear 204 is meshed and connected with the rotating gear ring 103; a boom weight 205 is arranged on the load-bearing outer arm 201; the boom weight 205 includes a main load casting 206, side casting 207, upper rotating arm 208, lower rotating arm 209 and hydraulic support arm 210, the main load-bearing casting 206 is arranged on the load-bearing outer arm 201, one end of the upper rotating arm 208 is rotatably arranged on the main load-bearing casting 206, the side casting 207 is rotatably connected to the other end of the upper rotating arm 208, one end of the lower rotating arm 209 is rotatably arranged on the main load-bearing casting 206, the side casting 207 is rotatably connected to the other end of the lower rotating arm 209, the fixed end of the hydraulic support arm 210 is rotatably arranged on the main load-bearing casting 206, and the telescopic end of the hydraulic support arm 210 is rotatably connected to the side casting 207.

[0042] The boom mechanism 3 includes a boom base 301, a sliding arm docking shaft 302, a load-bearing docking shaft 303, a carrying boom 304 and a load-bearing boom 305. The boom base 301 is arranged at the top of the column mechanism 2, the sliding arm docking shaft 302 is arranged at the middle of the boom base 301, the load-bearing docking shaft 303 is arranged at the top of the boom base 301, and symmetrical carrying booms 304 are rotatably arranged at both ends of the sliding arm docking shaft 302, and a load-bearing boom 305 is rotatably arranged on the load-bearing docking shaft 303; A top isotropic shaft 306 is provided at one end of the load-bearing arm 305, a bottom isotropic shaft 308 is provided at one end of the carrying arm 304, a linkage limit arm 307 is rotatably connected to the top isotropic shaft 306, and the lower end of the linkage limit arm 307 is rotatably connected to the bottom isotropic shaft 308; an angular momentum balancing device 309 is provided at the other end of the carrying arm 304, and the angular momentum balancing device 309 includes a right rotating shaft 310, a right balancing wheel 311, a right transmission gear disc 312, and a left transmission gear disc 313, a left rotating shaft 314, a left balancing wheel 315, a balancing gear disc 316 and a balancing motor 317, the right rotating shaft 310 is rotatably arranged at the other end of one set of carrying booms 304, the left rotating shaft 314 is rotatably arranged at the other end of another set of carrying booms 304, the right rotating shaft 310 is rotatably connected to the left rotating shaft 314 at the same time, the right balancing wheel 311 is arranged at the outer end of the right rotating shaft 310, the right transmission gear disc 312 is arranged on the right rotating shaft 310, and the left balancing wheel 315 is arranged on the left rotating shaft 31 4, a left transmission gear disc 313 is arranged on the other end of the left rotating shaft 314, a balancing motor 317 is arranged above the carrying boom 304, a balancing gear disc 316 is arranged on the output end of the balancing motor 317, the balancing gear disc 316 is meshed and connected with the left balancing wheel 315, and the balancing gear disc 316 is also meshed and connected with the right balancing wheel 311; a traction cable 318 is arranged on the other end of the load-bearing boom 305, and the traction cable 318 is also connected to the main load-bearing casting 206.

[0043] The traction mechanism 4 includes a sliding device 401 and an electric hoist 402. The sliding device 401 is slidably arranged between two sets of carrying arms 304, and the electric hoist 402 is arranged below the sliding device 401; the sliding device 401 includes a main sliding system 403, a driving unit 404, an auxiliary sliding system 405 and an arm connecting arm 406. The main sliding system 403 is slidably arranged on the carrying arm 304, the auxiliary sliding system 405 is slidably arranged on the carrying arm 304, and the driving unit 404 is arranged on the side wall of the main sliding system 403. One end of the boom connecting arm 406 is fixedly connected to the bottom of the main sliding system 403, and the other end of the boom connecting arm 406 is fixedly connected to the bottom of the auxiliary sliding system 405; the main sliding system 403 includes a sliding cabin 407, a horizontal pulley 408 and an extrusion pulley 409, and a symmetrical horizontal pulley 408 is rotatably provided in the sliding cabin 407, and the horizontal pulley 408 is rollingly fitted with the carrying boom 304, and a symmetrical extrusion pulley 409 is rotatably provided in the sliding cabin 407, and the horizontal pulley 408 is transmission-connected to the output end of the driving unit 404.

[0044] When used specifically, during the lifting process of the device, the electric hoist 402 is used to lift the cargo, and the angular momentum balancing device 309 is started. The balancing motor 317 is started first, and the balancing motor 317 drives the balancing gear plate 316 to rotate. The rotation of the balancing gear plate 316 drives the left balancing wheel 315 to rotate. The rotation of the left balancing wheel 315 drives the left rotating shaft 314 to rotate. The rotation of the left rotating shaft 314 drives the left balancing wheel 315 to rotate. The rotation of the balancing gear plate 316 drives the right rotating shaft 310 to rotate. The rotation of the right rotating shaft 310 drives the right balancing wheel 311 to rotate. The right balancing wheel 311 rotates in opposite directions to the left balancing wheel 315. The angular momentum torque generated by the rotation of the right balancing wheel 311 and the left balancing wheel 315 is opposite in horizontal direction and coaxial with the axial direction of the right rotating shaft 310. During the lifting process of the electric hoist 402, the angular momentum generated by the right balancing wheel 311 and the left balancing wheel 315 can be improved The stability of the carrying boom 304, at the same time, when the sliding device 401 slides with the carrying boom 304, the shaking of the carrying boom 304 can also be reduced; when the equipment needs to be rotated, the boom load 205 is turned on, and the hydraulic support arm 210 is extended to drive the upper rotating arm 208 and the lower rotating arm 209 to rotate synchronously. The rotation of the upper rotating arm 208 and the lower rotating arm 209 drives the side casting 207 to expand outward. When the side castings 207 on both sides are synchronously expanded, it is equivalent to that the rotation radius of the boom load 205 during the rotation process increases, that is, the displacement vector increases, while the momentum provided by the rotating motor 203 remains unchanged. In order to maintain the conservation of angular momentum, the overall rotation speed of the equipment must be slowed down, which can provide smoother rotational motion, and can effectively reduce the swing and shaking caused by acceleration, deceleration or sudden change of direction, avoid the equipment from tipping over during rotation, and improve the stability and safety of operation.

[0045] The above is the specific working process of the present invention, and you can repeat this step next time you use it.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0047] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present invention.

[0048] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A long cantilever beam lifting device, characterized in that: The invention comprises a base mechanism (1), a column mechanism (2), an arm mechanism (3) and a traction mechanism (4); the base mechanism (1) is installed on the ground; the lower end of the column mechanism (2) is transmission-connected to the base mechanism (1); the arm mechanism (3) is arranged at the upper end of the column mechanism (2); and the traction mechanism (4) is slidably arranged on the arm mechanism (3); the base mechanism (1) comprises a fixed chassis (101), a docking base (102) and a rotating gear ring (103); the fixed chassis (101) is installed on the ground; the docking base (102) is arranged on the fixed chassis (101) The rotating gear ring (103) is arranged on the top of the docking base (102); the fixed chassis (101) is provided with an inner core pile (104), and the bottom end of the inner core pile (104) is deep into the ground; the column mechanism (2) comprises a load-bearing outer arm (201), a rotating carrying plate (202), a rotating motor (203) and a rotating gear (204); the load-bearing outer arm (201) is sleeved on the outside of the inner core pile (104), and the bottom end of the load-bearing outer arm (201) is rotatably connected to the bottom of the inner core pile (104); the rotating carrying plate (202) is arranged on the load-bearing outer arm (201), the rotating motor (203) is arranged on the rotating mounting plate (202), and the rotating gear (204) is arranged on the output end of the rotating motor (203); the load-bearing outer arm (201) is provided with a boom load (205); the boom mechanism (3) comprises a boom base (301), a sliding arm docking shaft (302), a load-bearing docking shaft (303) and a load-bearing boom (305), the boom base (301) is arranged on the top of the column mechanism (2), the sliding arm docking shaft (302) is arranged in the middle of the boom base (301), and the load-bearing docking shaft (303) Located at the top of the boom base (301), symmetrical carrying booms (304) are rotatably provided at both ends of the sliding arm docking shaft (302), and there are two groups of carrying booms (304). A load-bearing boom (305) is rotatably provided on the load-bearing docking shaft (303); a top isotropic shaft (306) is provided at the long end of the load-bearing boom (305), and a bottom isotropic shaft (308) is provided at the long end of the carrying boom (304); a linkage limit arm (307) is rotatably connected to the top isotropic shaft (306), and the lower end of the linkage limit arm (307) is rotatably connected to the bottom isotropic shaft (308);An angular momentum balancing device (309) is provided at the short arm end of the carrying boom (304), and the angular momentum balancing device (309) comprises a right rotating shaft (310), a right balancing wheel (311), a right transmission gear plate (312), a left transmission gear plate (313), a left rotating shaft (314), a left balancing wheel (315), a balancing gear plate (316) and a balancing motor (317). The right rotating shaft (310) is rotatably provided at the short arm end of one group of carrying booms (304), and the left rotating shaft (314) is rotatably provided at the short arm end of another group of carrying booms (304). The right rotating shaft (310) is simultaneously rotatably connected to the left rotating shaft (314). Then, the right balancing wheel (311) is arranged at the outer end of the right rotating shaft (310), the right transmission toothed disc (312) is arranged on the right rotating shaft (310), the left balancing wheel (315) is arranged at the outer end of the left rotating shaft (314), the left transmission toothed disc (313) is arranged at the inner end of the left rotating shaft (314), the balancing motor (317) is arranged above the carrying boom (304), the balancing toothed disc (316) is arranged at the output end of the balancing motor (317), the balancing toothed disc (316) is meshedly connected with the left balancing wheel (315), and the balancing toothed disc (316) is meshedly connected with the right balancing wheel (311) at the same time. ; 2. A long cantilever beam lifting device according to claim 1, characterized in that: The boom load (205) comprises a main load-bearing casting (206), a side casting (207), an upper rotating arm (208), a lower rotating arm (209) and a hydraulic support arm (210); the main load-bearing casting (206) is arranged on the load-bearing outer arm (201); one end of the upper rotating arm (208) is rotatably arranged on the main load-bearing casting (206); the side casting (207) is rotatably connected to the other end of the upper rotating arm (208); one end of the lower rotating arm (209) is rotatably arranged on the main load-bearing casting (206); the side casting (207) is rotatably connected to the other end of the lower rotating arm (209); the fixed end of the hydraulic support arm (210) is rotatably arranged on the main load-bearing casting (206); and the telescopic end of the hydraulic support arm (210) is rotatably connected to the side casting (207).

3. A long cantilever beam lifting device according to claim 2, characterized in that: A traction steel cable (318) is provided at the short arm end of the load-bearing suspension arm (305), and the traction steel cable (318) is also connected to the main load-bearing casting (206).

4. A long cantilever beam lifting device according to claim 3, characterized in that: The rotating gear (204) is meshingly connected with the rotating gear ring (103).

5. A long cantilever beam lifting device according to claim 4, characterized in that: The traction mechanism (4) comprises a sliding device (401) and an electric hoist (402); the sliding device (401) is slidably disposed between two sets of carrying arms (304); and the electric hoist (402) is disposed below the sliding device (401).

6. A long cantilever beam lifting device according to claim 5, characterized in that: The sliding device (401) comprises a main sliding system (403), a driving unit (404), a secondary sliding system (405) and a boom connecting arm (406); the main sliding system (403) is slidably arranged on the inner side of a group of carrying booms (304); the secondary sliding system (405) is slidably arranged on the inner side of another group of carrying booms (304); the driving unit (404) is arranged on the side wall of the main sliding system (403); one end of the boom connecting arm (406) is fixedly connected to the bottom of the main sliding system (403); and the other end of the boom connecting arm (406) is fixedly connected to the bottom of the secondary sliding system (405).

7. A long cantilever beam lifting device according to claim 6, characterized in that: The main sliding system (403) comprises a sliding cabin (407), a horizontal pulley (408) and an extrusion pulley (409); a symmetrical horizontal pulley (408) is rotatably provided in the sliding cabin (407); the horizontal pulley (408) is in rolling contact with the carrying boom (304); a symmetrical extrusion pulley (409) is rotatably provided in the sliding cabin (407); the horizontal pulley (408) is drivingly connected to the output end of the driving unit (404).

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