Crane main beam and crane using the main beam

Abstract

The present invention relates to the technical field of cranes, and in particular to a crane main beam and a crane using the main beam, which can adjust the horizontal state of the main beam, assist the starting and movement of the lifting trolley, effectively reduce the starting current and the operating current, and have good practicality and high safety; it includes a lifting trolley, on which a winder and a walking track wheel set are installed; it also includes two bearing frames, a movable beam, two upper limit connecting structures, two lower limit connecting structures and an angle adjustment mechanism, both bearing frames are provided with upper limit connecting structures, the lifting trolley walks on the movable beam, the movable beam is provided with a lower limit connecting structure matching the two upper limit connecting structures, the lower limit connecting structure of the movable beam is movably connected to the upper limit connecting structure, the angle adjustment mechanism is respectively connected to the two bearing frames and the left and right ends of the movable beam, the angle adjustment mechanism drives the movable beam to tilt to a certain angle, so that the lifting trolley can slide in a specified direction along the movable beam under the action of gravity.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and in particular to a crane main beam and a crane using the main beam. Background Art

[0002] Cranes, especially gantry cranes and bridge cranes installed in sites and workshops are equipped with main beams. The main beams are generally set horizontally. A lifting trolley that moves along the main beam is set on the main beam. The lifting trolley is equipped with a sling winder and an electric travel wheel set. After the crane hangs the heavy object, the lifting trolley moves left and right along the main beam, and the main beam moves back and forth along the track in the site, thereby lifting the heavy object to the designated position.

[0003] After the trolley hoists a heavy object, the main beam will collapse under the gravity of the object and the trolley. There are many optimized main beam structures in the prior art to minimize this collapse, such as the anti-sway bridge crane main beam structure proposed in the patent application disclosed as "CN111470419A." However, this main beam collapse cannot be eliminated. On the main beam of the prior art crane, the trolley is always started from a stationary state. The starting current of the trolley's motor is much greater than the rated operating current. For a trolley lifting a heavy object, even a small amount of collapse will significantly hinder the trolley's starting and operation, significantly increasing the starting and operating currents required by the trolley. This increases power consumption and is not conducive to safe use. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a crane main beam and a crane using the main beam that can adjust the horizontal state of the main beam, assist the starting and movement of the lifting trolley, effectively reduce the starting current and the operating current, and has good practicality and high safety.

[0005] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion. The cooperation and limit of the position connection structure allows the two ends of the movable beam to move up and down slightly without being separated from the two bearing frames. When lifting heavy objects, before the walking track wheel group of the lifting trolley is started, the angle adjustment mechanism is operated, so that the movable beam is tilted to a certain angle in the moving direction of the lifting trolley, so that the lifting trolley and the heavy object slide under the action of their own gravity, overcoming the obstruction caused by the collapse of the movable beam. After the walking track wheel group of the lifting trolley rotates, its drive motor is restarted. At this time, the rotor of the drive motor is in a rotating state, eliminating the influence of motor stalling, thereby greatly reducing the starting current of the drive motor. Since the lifting trolley moves along the inclined movable beam, the operating current of the above-mentioned drive motor is reduced, which is beneficial to saving energy and safe use. Before the heavy object reaches the specified position, the angle adjustment mechanism is reset, so that the movable beam returns to a horizontal state, which is beneficial for the lifting trolley to stop at the specified position, and has good practicality.

[0006] Preferably, it also includes a plurality of inclined cables, and upright columns are provided on both supporting frames. One end of the plurality of inclined cables is respectively connected to the upright columns of the two supporting frames, and the other end of the plurality of inclined cables is connected to the movable beam. The connection points of the plurality of inclined cables and the movable beam are evenly arranged; the plurality of inclined cables pull and lift the movable beam, thereby increasing the load-bearing capacity of the movable beam.

[0007] Preferably, it also includes two spirit levels, which are symmetrically installed on the left and right parts of the movable beam respectively, and the two spirit levels are electrically connected to the angle adjustment mechanism; the two spirit levels cooperate to detect the horizontal state and tilt angle of the movable beam, and send the detection information to the angle adjustment mechanism, so that the movable beam can be restored to a horizontal state before the lifting trolley starts and after it stops, and at the same time control the tilt angle of the movable beam to be at a certain angle, not too large or too small.

[0008] Preferably, it also includes two lower columns and a lower pull cable, and two lower columns are vertically installed downward on the left and right ends of the lower end surface of the movable beam, and the two ends of the lower pull cable are respectively connected to the two lower columns; when the movable beam collapses downward due to gravity, it will drive the lower ends of the two lower columns to tilt sideways. At this time, the tensile effect of the lower pull cable reduces the inclination of the two lower columns, thereby improving the bearing capacity of the movable beam.

[0009] Preferably, the angle adjustment mechanism includes two hydraulic cylinders and a hydraulic unit, and load-bearing beams are provided on the columns of the two supporting frames. The fixed ends of the two hydraulic cylinders are respectively connected to the load-bearing beams of the two supporting frames, and the piston rods of the two hydraulic cylinders are respectively connected to the left and right ends of the movable beam, and the hydraulic unit is installed on the crossbeam between the two supporting frames; when the angle of the movable beam needs to be adjusted to assist the starting of the lifting trolley, the hydraulic unit drives the hydraulic cylinder in the opposite direction of the movement of the lifting trolley to contract, so that the movable beam is tilted to a certain angle, so that the lifting trolley slides under the action of gravity, thereby achieving the purpose of reducing the starting current and running current of the driving motor of the walking track wheel group of the lifting trolley.

[0010] Preferably, the angle adjustment mechanism includes two camshafts, multiple cams, two swing arms, two hydraulic cylinders and a hydraulic unit. A load-bearing beam is provided on the columns of the two carriers. The two camshafts are rotatably mounted on the left and right ends of the movable beam respectively. Multiple cams are installed on the two camshafts. The cam surfaces of the multiple cams extend out of the lower end surface of the movable beam and contact with the upper end surface of the carrier. The lower ends of the two swing arms are respectively connected to the two camshafts, and the upper ends of the two swing arms are respectively rotatably connected to the piston rods of the two hydraulic cylinders. The length of the swing arm is greater than the cam diameter of the cam. The fixed ends of the two hydraulic cylinders are respectively The two camshafts are rotatably connected to the load-bearing beams respectively; when the angle of the movable beam needs to be adjusted to assist the starting of the lifting trolley, the hydraulic unit drives the hydraulic cylinder 2 in the opposite direction of the movement of the lifting trolley to extend, and the piston rod of the hydraulic cylinder 2 pushes the upper end of the swing arm to rotate downward, and the lower end of the swing arm drives the camshaft to rotate, and the camshaft drives multiple cams to rotate, so that the cam surfaces of the multiple cams extend out of the lower end surface of the movable beam and contact with the support frame, thereby lifting one end of the movable beam and tilting the movable beam at a certain angle, so as to achieve the purpose of reducing the starting current and operating current of the driving motor of the traveling track wheel group of the lifting trolley.

[0011] Preferably, the angle adjustment mechanism includes multiple lower brackets, multiple lower support arms, multiple upper support arms, two push blocks, a hydraulic cylinder and a hydraulic unit. The lower end surfaces of the two support frames are each equipped with multiple lower brackets, and the multiple lower brackets are arranged symmetrically on the left and right. The lower ends of the multiple lower support arms are respectively rotatably hinged to the multiple lower brackets, and the upper ends of the multiple upper support arms are respectively rotatably hinged to the lower end surfaces of the left and right ends of the movable beam. The lower ends of the two push blocks are respectively rotatably hinged to the upper ends of the multiple lower support arms, and the upper ends of the two push blocks are respectively rotatably hinged to the lower ends of the multiple upper support arms. The multiple lower support arms and the multiple upper support arms are all arranged tilted, and the tilt angles of the multiple lower support arms are the same. Similarly, the two ends of hydraulic cylinder three are connected to two push blocks respectively; when the angle of the movable beam needs to be adjusted to assist the starting of the lifting trolley, the hydraulic unit drives hydraulic cylinder three to extend or shorten, and the two ends of hydraulic cylinder three pull or push the two push blocks synchronously close or away, so that the multiple lower support arms and multiple upper support arms on one side are vertically extended under the drive of one push block, pushing one end of the movable beam to rise, so that the multiple lower support arms and multiple upper support arms on the other side are more inclined under the drive of another push block, pulling the other end of the movable beam down, thereby tilting the movable beam to a certain angle, thereby achieving the purpose of reducing the starting current and operating current of the driving motor of the walking track wheel group of the lifting trolley.

[0012] A crane comprises the crane main beam as described above; adopting the above technical solution can reduce the power consumption of the crane and improve the safety of crane use.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the cooperative limitation of the two upper limit connection structures and the two lower limit connection structures enables the two ends of the movable beam to move up and down slightly without being separated from the two supporting frames. When lifting heavy objects, before the walking track wheel group of the lifting trolley is started, the angle adjustment mechanism is operated, so that the movable beam is tilted to a certain angle in the moving direction of the lifting trolley, so that the lifting trolley and the heavy object slide under the action of their own gravity, overcoming the obstruction caused by the collapse of the movable beam. After the walking track wheel group of the lifting trolley rotates, its drive motor is restarted. At this time, the rotor of the drive motor is in a rotating state, eliminating the influence of motor stalling, thereby greatly reducing the starting current of the drive motor. Since the lifting trolley moves along the inclined movable beam, the operating current of the above-mentioned drive motor is reduced, which is beneficial to saving energy and safe use. Before the heavy object reaches the specified position, the angle adjustment mechanism is reset, so that the movable beam returns to a horizontal state, which is beneficial for the lifting trolley to stop at the specified position, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is an axonometric structural diagram of embodiment 1 of the present invention;

[0015] Figure 2 is a front structural diagram of Example 1 of the present invention;

[0016] Figure 3 2 is a schematic diagram of the axonometric structure of embodiment 2 of the present invention;

[0017] Figure 4 is a front structural diagram of embodiment 2 of the present invention;

[0018] Figure 5 1 is a schematic diagram of the axonometric structure of embodiment 3 of the present invention;

[0019] Figure 6 is a front structural diagram of Example 3 of the present invention;

[0020] Figure 7 It is a schematic diagram of the structure of the load-bearing frame, movable beam and other structures in the exploded state;

[0021] Markings in the attached figure: 1. Hoisting trolley; 2. Carrying frame; 3. Movable beam; 4. Inclined cable; 5. Upper limit connecting structure; 6. Lower limit connecting structure; 7. Level; 8. Support beam; 9. Lower column; 10. Lower cable; 11. Hydraulic cylinder one; 12. Camshaft; 13. Cam; 14. Swing arm; 15. Hydraulic cylinder two; 16. Lower bracket; 17. Lower support arm; 18. Upper support arm; 19. Push block; 20. Hydraulic cylinder three. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0023] Example 1

[0024] like Figure 1 、 Figure 2 and Figure 7 As shown, it also includes multiple inclined cables 4, and upright columns are provided on the two supporting frames 2. One end of the multiple inclined cables 4 is respectively connected to the columns of the two supporting frames 2, and the other end of the multiple inclined cables 4 is connected to the movable beam 3. The connection points of the multiple inclined cables 4 and the movable beam 3 are evenly arranged; it also includes two spirit levels 7, which are symmetrically installed on the left and right parts of the movable beam 3, and the two spirit levels 7 are electrically connected to the angle adjustment mechanism; it also includes two lower columns 9 and lower cables 10, and two lower columns 9 are vertically installed downward on the left and right ends of the lower end surface of the movable beam 3, and the two ends of the lower cable 10 are respectively connected to the two lower columns 9; the angle adjustment mechanism includes two hydraulic cylinders 11 and a hydraulic unit, and load-bearing beams are provided on the columns of the two supporting frames 2. The fixed ends of the two hydraulic cylinders 11 are respectively connected to the load-bearing beams of the two supporting frames 2, and the piston rods of the two hydraulic cylinders 11 are respectively connected to the left and right ends of the movable beam 3, and the hydraulic unit is installed on the crossbeam between the two supporting frames 2.

[0025] The cooperation and limitation of the two upper limit connection structures 5 and the two lower limit connection structures 6 allow the two ends of the movable beam 3 to move up and down slightly without being separated from the two bearing frames 2. When the movable beam 3 collapses downward due to gravity, it will drive the lower ends of the two lower columns 9 to tilt sideways. At this time, the tensile effect of the lower cable 10 reduces the tilting degree of the two lower columns 9. Multiple inclined cables 4 pull and lift the movable beam 3, thereby improving the load-bearing capacity of the movable beam 3. When lifting heavy objects, before the walking track wheel group of the lifting trolley 1 is started, the hydraulic unit drives the hydraulic cylinder 11 in the opposite direction of the movement of the lifting trolley 1 to contract, so that the movable beam 3 tilts to a certain angle, and the two spirit levels 7 cooperate to detect the tilt angle of the movable beam 3. The lifting trolley 1 and the heavy object slide under the action of their own gravity, overcoming the obstruction caused by the collapse of the movable beam 3. After the walking track wheel group of the lifting trolley 1 rotates, its drive motor is restarted. At this time, the rotor of the drive motor is in a rotating state, eliminating the influence of the motor stalling, thereby greatly reducing the starting current of the drive motor. Since the lifting trolley 1 moves along the inclined movable beam 3, the operating current of the above-mentioned drive motor is reduced, which is beneficial to saving energy and safe use. Before the heavy object reaches the specified position, the hydraulic cylinder 11 is reset, so that the movable beam 3 returns to a horizontal state. The two spirit levels 7 cooperate to detect the horizontal state of the movable beam 3, which is beneficial for the lifting trolley 1 to stop at the specified position and has good practicality.

[0026] Example 2

[0027] like Figure 3 and Figure 4 As shown, the angle adjustment mechanism includes two camshafts 12, multiple cams 13, two swing arms 14, two hydraulic cylinders 15 and a hydraulic unit. Load-bearing beams are provided on the columns of the two supporting frames 2. The two camshafts 12 are rotatably installed on the left and right ends of the movable beam 3 respectively. Multiple cams 13 are installed on the two camshafts 12. The cam surfaces of the multiple cams 13 extend out of the lower end surface of the movable beam 3 and contact the upper end surface of the supporting frame 2. The lower ends of the two swing arms 14 are respectively connected to the two camshafts 12, and the upper ends of the two swing arms 14 are respectively rotatably connected to the piston rods of the two hydraulic cylinders 15. The length of the swing arm 14 is greater than the cam diameter of the cam 13, and the fixed ends of the two hydraulic cylinders 15 are respectively rotatably connected to the load-bearing beams of the two camshafts 12.

[0028] When it is necessary to adjust the angle of the movable beam 3 to assist the starting of the lifting trolley 1, the hydraulic unit drives the hydraulic cylinder 2 15 in the opposite direction of the movement of the lifting trolley 1 to extend, and the piston rod of the hydraulic cylinder 2 15 pushes the upper end of the swing arm 14 to rotate downward, and the lower end of the swing arm 14 drives the camshaft 12 to rotate, and the camshaft 12 drives multiple cams 13 to rotate, so that the cam surfaces of the multiple cams 13 extend out of the lower end surface of the movable beam 3 and contact the support frame 2, thereby lifting one end of the movable beam 3 and tilting the movable beam 3 to a certain angle, thereby achieving the purpose of reducing the starting current and operating current of the driving motor of the traveling track wheel group of the lifting trolley 1.

[0029] Example 3

[0030] like Figure 5 and Figure 6 As shown, the angle adjustment mechanism includes multiple lower brackets 16, multiple lower support arms 17, multiple upper support arms 18, two push blocks 19, a hydraulic cylinder three 20 and a hydraulic unit. The lower end surfaces of the two supporting frames 2 are each installed with multiple lower brackets 16, and the multiple lower brackets 16 are arranged symmetrically on the left and right. The lower ends of the multiple lower support arms 17 are respectively rotatably hinged to the multiple lower brackets 16, and the upper ends of the multiple upper support arms 18 are respectively rotatably hinged to the lower end surfaces of the left and right ends of the movable beam 3. The lower ends of the two push blocks 19 are respectively rotatably hinged to the upper ends of the multiple lower support arms 17, and the upper ends of the two push blocks 19 are respectively rotatably hinged to the lower ends of the multiple upper support arms 18. The multiple lower support arms 17 and the multiple upper support arms 18 are all arranged tilted, and the inclination angles of the multiple lower support arms 17 are the same, and the inclination angles of the multiple upper support arms 18 are the same. The two ends of the hydraulic cylinder three 20 are respectively connected to the two push blocks 19.

[0031] When the angle of the movable beam 3 needs to be adjusted to assist the starting of the lifting trolley 1, the hydraulic unit drives the hydraulic cylinder three 20 to extend or shorten, and the two ends of the hydraulic cylinder three 20 pull or push the two push blocks 19 to move closer or farther away synchronously, so that the multiple lower support arms 17 and the multiple upper support arms 18 on one side are vertically extended under the drive of one push block 19, pushing one end of the movable beam 3 to rise, so that the multiple lower support arms 17 and the multiple upper support arms 18 on the other side are more inclined under the drive of another push block 19, pulling the other end of the movable beam 3 down, thereby tilting the movable beam 3 to a certain angle, thereby achieving the purpose of reducing the starting current and operating current of the walking track wheel group drive motor of the lifting trolley 1.

[0032] like Figures 1 to 7As shown, a crane main beam and a crane using the main beam of the present invention, when working and lifting heavy objects, first, before the running track wheel group of the lifting trolley 1 is started, the hydraulic unit drives the angle adjustment mechanism to operate, so that the movable beam 3 is tilted at a certain angle to the moving direction of the lifting trolley 1, so that the lifting trolley 1 and the heavy object slide under the action of their own gravity. Then, after the running track wheel group of the lifting trolley 1 is rotated, its driving motor is restarted. At this time, the rotor of the driving motor is in a rotating state, eliminating the influence of the motor stalling, thereby greatly reducing the starting current of the driving motor. Then, since the lifting trolley 1 moves along the inclined movable beam 3, the operating current of the above-mentioned driving motor is reduced, which is beneficial to saving energy and safe use. Finally, before the heavy object reaches the specified position, the angle adjustment mechanism is reset, so that the movable beam 3 returns to the horizontal state, and the lifting trolley 1 is stopped at the specified position.

[0033] The main functions achieved by the present invention are:

[0034] 1. It can adjust the horizontal state of the main beam, overcome the influence of the main beam sagging, assist the starting and moving of the lifting trolley, effectively reduce the starting current and running current, and has good practicality and high safety;

[0035] 2. It has upper and lower cable structures to improve the load-bearing capacity of the main beam;

[0036] 3. Detect the horizontal state and tilt angle of the main beam and adjust it automatically.

[0037] The installation method, connection method or setting method of the crane main beam of the present invention and the crane using the main beam are all common mechanical methods, and can be implemented as long as they can achieve their beneficial effects; the lifting trolley 1, movable beam 3, inclined cable 4, level 7, lower cable 10, hydraulic cylinder 11, hydraulic unit, camshaft 12, cam 13, hydraulic cylinder 2 15, and hydraulic cylinder 3 20 of the crane main beam of the present invention and the crane using the main beam are purchased on the market, and technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without the need for technical personnel in this field to pay creative labor.

[0038] All technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the present specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A crane main beam, comprising a lifting trolley (1), on which a winder and a running track wheel set are mounted; characterized in that: The invention also includes two bearing frames (2), a movable beam (3), two upper limit connection structures (5), two lower limit connection structures (6) and an angle adjustment mechanism. The two bearing frames (2) are connected by a crossbeam. The two bearing frames (2) are both provided with an upper limit connection structure (5). The movable beam (3) is provided with a track. The walking track wheel group of the lifting trolley (1) rolls on the above track. The lower end surfaces of the left and right ends of the movable beam (3) are respectively provided with lower limit connection structures (6) matching the two upper limit connection structures (5). The lower limit connection structures (6) at the left and right ends of the movable beam (3) are respectively movably connected to the upper limit connection structures (5) of the two bearing frames (2). The angle adjustment mechanism connects the two bearing frames (2) and the left and right ends of the movable beam (3). The angle adjustment mechanism drives the movable beam (3) to tilt at a certain angle, so that the lifting trolley (1) can slide along the movable beam (3) in a specified direction under the action of gravity. After the traveling track wheel set of the lifting trolley (1) rotates, its driving motor is restarted. At this time, the rotor of the driving motor is in a rotating state, eliminating the effect of motor stalling. Before the weight reaches the specified position, the angle adjustment mechanism is reset, so that the movable beam (3) returns to a horizontal state. The angle adjustment mechanism includes two hydraulic cylinders (11) and a hydraulic unit. A load-bearing beam is provided on the columns of the two support frames (2). The fixed ends of the two hydraulic cylinders (11) are respectively connected to the load-bearing beams of the two support frames (2). The piston rods of the two hydraulic cylinders (11) are respectively connected to the left and right ends of the movable beam (3). The hydraulic unit is installed on the crossbeam between the two support frames (2).

2. A crane main beam, comprising a lifting trolley (1), on which a winder and a running track wheel set are mounted; characterized in that: The invention also includes two bearing frames (2), a movable beam (3), two upper limit connection structures (5), two lower limit connection structures (6) and an angle adjustment mechanism. The two bearing frames (2) are connected by a crossbeam. The two bearing frames (2) are both provided with an upper limit connection structure (5). The movable beam (3) is provided with a track. The walking track wheel group of the lifting trolley (1) rolls on the above track. The lower end surfaces of the left and right ends of the movable beam (3) are respectively provided with lower limit connection structures (6) matching the two upper limit connection structures (5). The lower limit connection structures (6) at the left and right ends of the movable beam (3) are respectively movably connected to the upper limit connection structures (5) of the two bearing frames (2). The angle adjustment mechanism connects the two bearing frames (2) and the left and right ends of the movable beam (3). The angle adjustment mechanism drives the movable beam (3) to tilt at a certain angle, so that the lifting trolley (1) can slide along the movable beam (3) in a specified direction under the action of gravity. After the traveling track wheel set of the lifting trolley (1) rotates, its driving motor is restarted. At this time, the rotor of the driving motor is in a rotating state, eliminating the effect of motor stalling. Before the weight reaches the specified position, the angle adjustment mechanism is reset, so that the movable beam (3) returns to a horizontal state. The angle adjustment mechanism comprises two camshafts (12), a plurality of cams (13), two swing arms (14), two hydraulic cylinders (15) and a hydraulic unit. A load-bearing beam is provided on the columns of the two carriers (2). The two camshafts (12) are rotatably mounted on the left and right ends of the movable beam (3). The two camshafts (12) are respectively mounted with a plurality of cams (13). The cam surfaces of the plurality of cams (13) extend out of the lower end surface of the movable beam (3) and contact the upper end surface of the carrier (2). The lower ends of the two swing arms (14) are respectively connected to the two camshafts (12). The upper ends of the two swing arms (14) are respectively rotatably connected to the piston rods of the two hydraulic cylinders (15). The length of the swing arms (14) is greater than the cam diameter of the cam (13). The fixed ends of the two hydraulic cylinders (15) are respectively rotatably connected to the load-bearing beams of the two camshafts (12).

3. A crane main beam, comprising a lifting trolley (1), on which a winder and a running track wheel set are mounted; characterized in that: The invention also includes two bearing frames (2), a movable beam (3), two upper limit connection structures (5), two lower limit connection structures (6) and an angle adjustment mechanism. The two bearing frames (2) are connected by a crossbeam. The two bearing frames (2) are both provided with an upper limit connection structure (5). The movable beam (3) is provided with a track. The walking track wheel group of the lifting trolley (1) rolls on the above track. The lower end surfaces of the left and right ends of the movable beam (3) are respectively provided with lower limit connection structures (6) matching the two upper limit connection structures (5). The lower limit connection structures (6) at the left and right ends of the movable beam (3) are respectively movably connected to the upper limit connection structures (5) of the two bearing frames (2). The angle adjustment mechanism connects the two bearing frames (2) and the left and right ends of the movable beam (3). The angle adjustment mechanism drives the movable beam (3) to tilt at a certain angle, so that the lifting trolley (1) can slide along the movable beam (3) in a specified direction under the action of gravity. After the traveling track wheel set of the lifting trolley (1) rotates, its driving motor is restarted. At this time, the rotor of the driving motor is in a rotating state, eliminating the effect of motor stalling. Before the weight reaches the specified position, the angle adjustment mechanism is reset, so that the movable beam (3) returns to a horizontal state. The angle adjustment mechanism includes a plurality of lower brackets (16), a plurality of lower support arms (17), a plurality of upper support arms (18), two push blocks (19), a hydraulic cylinder (20) and a hydraulic unit. The lower end surfaces of the two carriers (2) are both equipped with a plurality of lower brackets (16). The plurality of lower brackets (16) are arranged symmetrically on the left and right. The lower ends of the plurality of lower support arms (17) are respectively rotatably hinged to the plurality of lower brackets (16). The upper ends of the plurality of upper support arms (18) are respectively hinged to the left and right sides of the movable beam (3). The lower end surface of the end is rotatably hinged, the lower ends of the two push blocks (19) are respectively rotatably hinged with the upper ends of the multiple lower support arms (17), the upper ends of the two push blocks (19) are respectively rotatably hinged with the lower ends of the multiple upper support arms (18), the multiple lower support arms (17) and the multiple upper support arms (18) are all arranged tilted, the tilt angles of the multiple lower support arms (17) are the same, the tilt angles of the multiple upper support arms (18) are the same, and the two ends of the hydraulic cylinder three (20) are respectively connected to the two push blocks (19).

4. A crane main beam according to any one of claims 1, 2 or 3, characterized in that: The system further comprises a plurality of inclined cables (4), wherein both supporting frames (2) are provided with upright columns, one end of each of the plurality of inclined cables (4) is respectively connected to the upright columns of the two supporting frames (2), and the other end of each of the plurality of inclined cables (4) is connected to the movable beam (3), and the connection points of the plurality of inclined cables (4) and the movable beam (3) are evenly arranged.

5. A crane main beam according to any one of claims 1, 2 or 3, characterized in that: It also includes two levels (7), which are symmetrically mounted on the left and right parts of the movable beam (3), respectively, and the two levels (7) are electrically connected to the angle adjustment mechanism.

6. A crane main beam according to claim 4, characterized in that: It also includes two lower columns (9) and a lower pull cable (10). The two lower columns (9) are vertically installed downward at the left and right ends of the lower end surface of the movable beam (3), and the two ends of the lower pull cable (10) are respectively connected to the two lower columns (9).

7. A crane, characterized in that: The crane comprises a crane main beam as described in any one of claims 1 to 6.

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