Main beam balancing device of double-beam bridge crane

Abstract

The invention discloses a main beam balancing device of a double-beam bridge crane, relates to the field of hoisting equipment, and aims to solve the problems of unstable operation and potential safety hazards of the hoisting equipment due to rail abrasion and wheel damage caused by rail gnawing in the moving process of an existing double-beam crane. A lifting frame is slidably connected to the middle of the rail bearing beam, a lifting assembly is arranged on the lifting frame, bearing beams are fixedly connected to the two ends of the rail bearing beam, balance blocks are fixedly connected to the outer sides of the bearing beams, two symmetrically-distributed bearing rods are fixedly connected to the balance blocks, and traction assemblies are installed between the bearing rods and the rail bearing beam. The device has the advantages that the auxiliary beam is additionally arranged on the rail bearing beam through the balance block and the bearing rods, the adjusting frame on the bearing rods is used for assisting the lifting frame, the downward load of the lifting frame is reduced, and the rail gnawing problem in the moving process of the lifting frame is reduced.

Description

Technical Field

[0001] This invention relates to the field of lifting equipment technology, and in particular to a main beam balancing device for a double-girder bridge crane. Background Technology

[0002] Double-girder bridge cranes are common lifting equipment widely used in construction sites, ports, and other similar locations. They utilize two parallel beams between which the lifting machinery moves to lift, transport, and lower goods, offering significant lifting capacity and working range. However, existing double-girder bridge cranes have some design flaws, particularly regarding the balance and stability of the main beam.

[0003] A novel double-girder bridge crane, disclosed in patent application number "CN202311003905.X", includes a main girder and a rail support beam. The rail support beam has a rotating rod driven by a motor. A translation frame is rotatably connected to the top of the rail support beam, and an installation assembly is fixedly connected to the bottom of the translation frame. An adjustment assembly is fixedly connected to the bottom of the installation assembly, and a gripping assembly is fixedly connected to the bottom of the adjustment assembly. The bottom of the rail support beam is fixedly connected to the main girder, and a connecting block is fixedly connected to the side of the main girder away from the rail support beam. A protective assembly is fixedly connected to the bottom of the main girder. This application adjusts the gripping height of the gripping assembly using the adjustment assembly, allowing for flexible adjustment of the cargo height during gripping to maintain uniform force distribution.

[0004] The aforementioned application aims to ensure the stability of double-girder cranes by reducing sway during lifting. However, for most current double-girder bridge cranes, the crossbeam design relies solely on support points at both ends. This design, when lifting heavy objects, causes significant deflection and deformation of the crossbeam due to the immense weight borne by the lifting frame. As the lifting frame moves along the crossbeam, this deformation intensifies, leading to uneven contact between the lifting frame and the crossbeam, and consequently, rail wear.

[0005] Rail wear refers to the severe wear that occurs when the wheel flanges of a crane come into contact with the side of the rail during operation. This not only accelerates the wear of crane components and reduces the service life of the equipment, but also affects the operational stability and safety of the crane. Specifically, rail wear can lead to the following problems: Rail wear: Friction between the wheel flanges and the side of the rail accelerates rail wear, and in severe cases, can even lead to rail damage; Wheel damage: Rail wear exacerbates the wear of the wheel flanges, thus affecting the balance and stability of the wheels; Unstable operation: Rail wear can cause the crane to sway and tilt during operation, affecting the crane's positioning accuracy and operational stability; Safety hazards: In severe cases, rail wear can even lead to the crane derailing or overturning, causing serious safety accidents. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a main beam balancing device for a double-girder bridge crane. This design effectively solves the problems of rail wear and wheel damage caused by rail biting during the movement of existing double-girder cranes, thereby avoiding the problems of unstable operation of the lifting equipment and potential safety hazards.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The present invention includes a rail support beam, a lifting frame slidably connected to the middle of the rail support beam, a lifting assembly provided on the lifting frame, load-bearing beams fixedly connected to both ends of the rail support beam, a counterweight fixedly connected to the outer side of the load-bearing beam, two symmetrically distributed load-bearing rods fixedly connected to the counterweights, a traction assembly installed between the load-bearing rods and the rail support beam, an adjusting frame slidably connected to the two load-bearing rods, and a connecting assembly installed between the adjusting frame and the lifting frame; The connecting assembly includes two sets of symmetrically distributed connecting rods. The upper end of the connecting rod is fixedly connected to a first sleeve, which is rotatably connected to the adjusting frame. The lower end of the connecting rod is fixedly connected to a second sleeve, which is rotatably connected to a support rod, which is fixedly connected to the lifting frame.

[0008] Preferably, the adjusting frame includes a first support rod, a second support rod that slides relative to the first support rod on one side, two sets of first sleeves that are rotatably connected to the first support rod and the second support rod respectively, two first sliding sleeves that slide relative to each other are slidably connected on the first support rod, two second sliding sleeves that slide relative to each other are slidably connected on the second support rod, a hinged connecting rod is installed between the two first sliding sleeves and the two second sliding sleeves, and a telescopic rod is fixedly connected between the first support rod and the second support rod, the telescopic rod being located above the hinged connecting rod.

[0009] Preferably, a first roller is rotatably connected to the lifting frame, a first track is fitted below the first roller, the first track is fixedly connected to the rail support beam, a first pulley is coaxially fixedly connected to the first roller, a connecting belt is fitted on the first pulley, a second pulley is fitted on the connecting belt, and a one-way lubricator is fitted on the second pulley, the one-way lubricator being located outside the first roller.

[0010] Preferably, the one-way lubricator includes a housing, an oil storage chamber inside the housing, an oil conveying plate rotatably connected inside the oil storage chamber, the oil conveying plate being fixedly connected to the second pulley, the oil conveying plate having a ratchet groove, an oil storage groove cooperating with the oil conveying plate on the inner side of the housing, an oil pipe fixedly connected to the outer end of the oil storage groove, a lubrication wheel rotatably connected to the lower end of the oil pipe, and the lubrication wheel being located on the side of the first track.

[0011] Preferably, there are two oil storage tanks, two oil pipes, and two lubrication wheels. The oil storage tank is located above the rotation center of the oil conveying plate. The oil pipe is provided with an oil outlet hole. The lubrication wheel is provided with a through hole. The oil pipe is inclined downwards. The two oil pipes are located on both sides of the housing, and the two lubrication wheels are located on both sides of the first track.

[0012] Preferably, the lifting assembly includes a winch, which is rotatably connected to the lifting frame. A lifting rope is fitted onto the winch, and a hook is connected to the lower end of the lifting rope.

[0013] Preferably, buffer columns are fixedly connected to both sides of the lifting frame.

[0014] Preferably, the traction assembly includes a first hanging ring, which is fixedly connected to the rail support beam. A traction rope is fitted onto the first hanging ring, and two second hanging rings are fitted onto the upper end of the traction rope. The two second hanging rings are symmetrically distributed about the first hanging ring, and the second hanging rings are fixedly connected to the load-bearing rod.

[0015] Preferably, a second track is fixedly connected inside the load-bearing rod, and a second roller that cooperates with the second track is rotatably connected to the adjusting frame.

[0016] The key advantages of this invention compared to existing technologies are: The present invention adds balance blocks on both sides of the load-bearing beam. The point of action of the load-bearing rod and the balance block is located on the outside of the load-bearing beam. This can prevent the track on the lower side of the load-bearing beam from being subjected to force on one side and play a role in balancing the track below.

[0017] In this invention, the load-bearing rod is located above the rail beam and provides an auxiliary crossbeam for the rail beam. Through the traction component, the support strength of the rail beam is improved, the deflection and deformation of the rail beam are reduced, the levelness of the rail beam is ensured, and the problem of rail biting during the movement of the lifting frame is avoided.

[0018] In this invention, the adjusting frame is located above the lifting frame. The adjusting frame shares the load of the lifting frame with the connecting rod, reducing the load of the lifting frame on the rail beam and avoiding the problem of rail wear caused by excessive load during the movement of the lifting frame. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the rail support beam connection structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the traction component structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the connecting rod connection structure of the present invention.

[0023] Figure 5 This is a schematic diagram of the adjustment frame structure of the present invention.

[0024] Figure 6 This is a schematic diagram of the connection structure between the connecting rod and the lifting frame of the present invention.

[0025] Figure 7 This is a schematic diagram of the axial structure of the lifting frame of the present invention.

[0026] Figure 8 This is a schematic diagram of the forward structure of the lifting frame of the present invention.

[0027] Figure 9 This is a schematic diagram of the first roller connection structure of the present invention.

[0028] Figure 10 This is a schematic diagram of the axial cross-sectional structure of the housing of the present invention.

[0029] Figure 11 This is a schematic diagram of the left cross-sectional structure of the housing of the present invention.

[0030] Figure 12 This is a schematic diagram of the exploded structure of the oil pipe and lubrication wheel of the present invention.

[0031] The diagram labels are as follows: 1. Rail support beam; 2. Lifting frame; 3. Lifting assembly; 301. Winch; 302. Lifting rope; 303. Hook; 4. Load-bearing beam; 5. Counterweight; 6. Load-bearing rod; 7. Traction assembly; 701. First hanging ring; 702. Traction rope; 703. Second hanging ring; 8. Adjusting frame; 801. First support rod; 802. Second support rod; 803. First sliding sleeve; 804. Second sliding sleeve; 805. Telescopic rod; 9. Connecting assembly; 01. Connecting rod; 902. Second sleeve; 903. Third sleeve; 904. Support rod; 10. First roller; 11. First track; 12. First pulley; 13. Connecting belt; 14. Second pulley; 15. Housing; 16. Oil storage chamber; 17. Oil conveying plate; 18. Racket groove; 19. Oil storage tank; 19. Oil pipe; 20. Lubricating wheel; 21. Oil outlet; 22. Buffer column; 23. Second track; 24. Second roller; 25. Oil pipe. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] Please see the appendix Figure 1-12This embodiment discloses a main beam balancing device for a double-girder bridge crane: It includes a support beam 1, a lifting frame 2 slidably connected to the middle of the support beam 1, a lifting assembly 3 on the lifting frame 2, load-bearing beams 4 fixedly connected to both ends of the support beam 1, a balance block 5 fixedly connected to the outer side of the load-bearing beam 4, two symmetrically distributed load-bearing rods 6 fixedly connected to the balance block 5, a traction assembly 7 installed between the load-bearing rods 6 and the support beam 1, an adjusting frame 8 slidably connected to the two load-bearing rods 6, and a connecting assembly 9 installed between the adjusting frame 8 and the lifting frame 2; the connecting assembly 9 includes two sets of symmetrically distributed connecting rods 901, a first sleeve fixedly connected to the upper end of the connecting rod 901, the first sleeve being rotatably connected to the adjusting frame 8, a second sleeve 902 fixedly connected to the lower end of the connecting rod 901, a support rod 904 rotatably connected to the second sleeve 902, and the support rod 904 being fixedly connected to the lifting frame 2.

[0034] The support beam 1 is a double-beam structure. The two crossbeams of the support beam 1 are located on the front and rear sides of the lifting frame 2. The support beam 1 serves as the support and guide structure for the lifting frame 2, providing a stable lifting and horizontally movable working environment. There are two load-bearing beams 4, located at opposite ends of the two support beams 1. The load-bearing beams 4 are situated above the support rails and have traveling and braking components. The two load-bearing beams 4 and the two support beams 1 form a hollow cuboid structure. The traveling components on the load-bearing beams 4 can drive the load-bearing beams 4 and 1 to move back and forth along the erected rails. The braking components control the position of the load-bearing beams 4. The materials and components of the load-bearing beams 4 and 1 are the same as those of existing double-beam cranes and are widely used in practice. The application will not be described in detail here. The lifting frame 2 can move laterally along the support beam 1. The lifting assembly 3 on the lifting frame 2 is responsible for performing the lifting operation. The lifting assembly 3 consists of a winch 301, a traction rope 702, and a hook 303. The winch 301 is connected to a control system, which controls the forward and reverse rotation of the winch 301 and its speed. The traction rope 702 is a wire rope or chain. The hook 303 is used to hang heavy objects. The lifting operation of the hook 303 on the heavy objects is controlled by the winch 301 winding and unwinding the traction rope 702. The double girder crane has a large span. The support beam 1 is located inside the erected track. To improve the stability of the support beam 1, balance blocks 5 are installed on both sides of the support beam 1. The balance blocks 5 are located at... On the outside of the load-bearing beam 4, the counterweight 5 is fixedly connected to the load-bearing beam 4. Two load-bearing rods 6 are connected between the two counterweights 5. The connection point between the load-bearing rods 6 and the counterweights 5 is located on the outside of the erecting track. The load-bearing rods 6 have an n-shaped structure. When the load-bearing rods 6 are subjected to a vertically downward force, they will transfer the downward force to the two counterweights 5. This increases the force on the counterweights 5 on the outside of the erecting track, thus balancing the imbalance of forces inside and outside the erecting track. The load-bearing rods 6 are located above the load-bearing beam 1, and the horizontal part of the load-bearing rods 6 is laid parallel to the load-bearing beam 1 vertically. The adjusting frame 8 is erected on the two load-bearing rods 6, located directly above the lifting frame 2. The left and right ends of the adjusting frame 8 are connected to the lifting frame 2 via connecting components 9. The connecting components 9 are in a tensioned state. The connecting assembly 9 connects the adjusting frame 8 and the lifting frame 2 together. During operation, the adjusting frame 8 can share the downward force of the lifting frame 2 through the connecting assembly 9. The two sets of supports, the lifting frame 2 and the adjusting frame 8, share the weight of the lifted load, thus preventing the lifting frame 2 from breaking due to excessive weight and preventing rail wear during movement. There are two sets of connecting assemblies 9, located on the left and right sides of the adjusting frame 8 respectively. Each set of connecting assemblies 9 has two connecting rods 901. The upper end of the connecting rod 901 is connected to the first sleeve, and the lower end of the connecting rod 901 is connected to the second sleeve 902. The second sleeve 902 is connected to the lifting frame 2 through the support rod 904. The first sleeve and the adjusting frame 8 have a degree of freedom of rotation.The second sleeve 902 and the support rod 904 have rotational freedom. Simultaneously, the load-bearing rod 6 provides a horizontal limit to the adjusting frame 8, and the rail-bearing beam 1 provides a horizontal limit to the lifting frame 2. The lifting frame 2, adjusting frame 8, and two connecting rods 901 form a quadrilateral mechanism that maintains horizontal movement on both the upper and lower sides. The lateral width of the adjusting frame 8 is adjustable. Both the adjusting frame 8 and the lifting frame 2 are subjected to significant downward gravity. When the lateral width of the adjusting frame 8 increases, the distance between the adjusting frame 8 and the lifting frame 2 must decrease accordingly. The length between the load-bearing rod 6 and the rail-bearing beam 1 remains constant. This increases the force exerted by the adjusting frame 8 on the upper side of the crane, allowing the adjusting frame 8 to share the load of the lifting frame 2 and preventing the lifting frame 2 from experiencing rail wear due to excessive load.

[0035] The adjusting frame 8 has a first support rod 801 and a second support rod 802 at its two ends. Two sets of traction components 7 are respectively connected to the first support rod 801 and the second support rod 802. The first sleeves on the first support rod 801 and the second support rod 802 are symmetrically distributed. Furthermore, two first sliding sleeves 803 are installed on the first support rod 801, and two second sliding sleeves 804 are installed on the second support rod 802. A hinged connecting rod is installed between the two first sliding sleeves 803 and the two second sliding sleeves 804. The hinged connecting rod consists of two mutually rotating connecting rods, with a hinge point in the middle of each connecting rod. The four hinge points of the two connecting rods are respectively connected to the two first sliding sleeves 803 and the two second sliding sleeves 804. A telescopic rod 805 is installed between the second sliding sleeve 804 and the first sliding sleeve 803. The telescopic rod 805 is a hydraulic rod, and its movement is controlled hydraulically. Figure 4 and Figure 5 As shown, when the telescopic rod 805 becomes longer, it causes the distance between the first support rod 801 and the second support rod 802 to increase. The increased length of the first support rod 801 and the second support rod 802 will cause the hinge points at the ends of the hinged connecting rod to move closer to each other. The movement of the ends of the hinged connecting rod is achieved through the sliding installation of the first sliding sleeve 803 and the second sliding sleeve 804. At the same time, the hinged connecting rod connects the first support rod 801 and the second support rod 802 into a whole, ensuring that the first support rod 801 and the second support rod 802 move synchronously.

[0036] The lifting frame 2 has four first rollers 10, all located within two first tracks 11. These two tracks are situated on two separate beams of the supporting beam 1. Each first roller 10 shares a drive shaft. All four first rollers 10 are fitted with one-way lubricators on their outer sides. During movement, these lubricators apply lubricant to the first tracks 11, reducing friction between the rollers 10 and the tracks 11 and minimizing heat generation. This prevents the rollers 10 from wearing off the tracks. The four one-way lubricators are divided into two groups: the one-way lubricator on the left side of the lifting frame 2 only dispenses lubricant when the lifting frame 2 moves to the left, and the one-way lubricator on the right side only dispenses lubricant when the lifting frame 2 moves to the right. This ensures that the first tracks 11 are always lubricated before the rollers 10 come into contact with the tracks. To ensure the lubricating oil effectively acts on the first roller 10, the one-way lubricator is driven by a pulley group consisting of a first pulley 12, a second pulley 14, and a connecting belt 13. The first pulley 12 and the second pulley 14 tension the connecting belt 13. When the first roller 10 rotates, it drives the first pulley 12 to rotate. The first pulley 12 rotates via the connecting belt 13, which in turn drives the second pulley 14. The second pulley 14 is the power source for the one-way lubricator, driving the oil-carrying disc 17 within it to rotate. The oil-carrying disc 17 is located within the housing 15 of the one-way lubricator. An oil storage chamber 16 within the housing 15 is used for lubricating oil. The level of lubricating oil in the oil storage chamber 16 will not exceed the rotation center of the oil-carrying disc 17, and simultaneously, the oil level in the oil storage chamber 16 will not be lower than the lowest point of the oil-carrying disc 17. This ensures that during the rotation of the oil-carrying disc 17, the ratchet groove 18 of the oil-carrying disc 17 can act on the lubricating oil. Figure 10As shown, the oil pan 17 has multiple ratchet grooves 18, which are tilted to one side. When the oil pan 17 rotates counterclockwise, the ratchet grooves 18 bend upwards, and some lubricating oil is stored in the ratchet grooves 18. As the oil pan 17 rotates upwards, the front and rear sides of the oil pan 17 are in contact with the inner wall of the oil storage cavity 16. The lubricating oil in the ratchet grooves 18 will only move from the front and rear sides of the ratchet grooves 18 into the oil storage trough 19 after it moves to the position of the oil storage trough 19. The height of the oil storage trough 19 is higher than that of the lubrication wheel. At a height of 20, the lubricating oil in the oil reservoir 19 moves to the lubricating wheel 20 through the oil pipe 25 under the action of gravity. The lubricating wheel 20 is rotatably connected to the oil pipe 25, which can reduce the friction between the lubricating wheel 20 and the first track 11. The lubricating wheel 20 has small holes, and the lubricating oil slowly seeps out to the surface of the lubricating wheel 20 through the small holes. In this way, after the lubricating wheel 20 rolls into contact with the first track 11, it can ensure that the lubricating oil is evenly coated on both sides of the first track 11. This can effectively reduce the problem of the first roller 10 biting the track when it moves.

[0037] Furthermore, to improve the lubrication of the first track 11, two lubrication wheels 20 are provided, located on the front and rear sides of the first track 11. The one-way lubricator on the left side of the lifting frame 2 has the same structure as the one-way lubricator on the right side, and their ratchet grooves 18 face the same direction. This ensures that only one set of one-way lubricators lubricates the first track 11 when the lifting frame 2 moves laterally.

[0038] The one-way lubricator and the first roller 10 are located on the front and rear sides of the lifting frame 2, respectively. Buffer columns 22 are installed on the left and right sides of the lifting frame 2. The buffer columns 22 are used to protect the safety of the lifting frame 2, reduce the damage to the lifting frame 2 during collisions when the lifting frame 2 moves laterally, and ensure the overall stability of the device.

[0039] The load-bearing rod 6 and the rail beam 1 are connected together by a traction assembly 7. There are multiple traction assemblies 7. The first hanging ring 701 in the traction assembly 7 is fixedly installed on the rail beam 1, and the two second hanging rings 703 are located below the load-bearing rod 6. The traction rope 702 has a V-shaped structure. There are rope loops at the connection between the traction rope 702 and the first hanging ring 701 and the second hanging ring 703. In addition, a rope length adjuster can be installed on the traction rope 702. The rope length adjuster can adjust the length of the traction rope 702 to ensure the traction of the load-bearing rod 6 on the rail beam 1 and improve the tensile strength of the rail beam 1.

[0040] Furthermore, to reduce the friction between the adjusting frame 8 and the load-bearing rod 6, a second roller 24 is installed on the adjusting frame 8. The cooperation between the second roller 24 and the second track 23 facilitates the movement of the adjusting frame 8 on the load-bearing rod 6 and ensures the stability of the horizontal movement of the adjusting frame 8.

[0041] The overall workflow of this invention is as follows: In this application, the load-bearing beam 4, the rail support beam 1, the balance block 5, and the load-bearing rod 6 uniformly provide stable support. The lifting frame 2 serves as the carrier of the lifting assembly 3. The adjusting frame 8 is located above the lifting frame 2 and is connected to the lifting frame 2 via the connecting assembly 9. The load-bearing rod 6 supports the adjusting frame 8, which reduces the load on the lifting frame 2 and minimizes rail wear when the lifting frame 2 moves. The lifting frame 2 is connected to the adjusting frame 8 via the connecting rod 901. The movement of the lifting frame 2 drives the adjusting frame 8 to move via the connecting rod 901, thereby ensuring that the adjusting frame 8 is always directly above the lifting frame 2. The adjusting frame 8 distributes the weight of the lifting frame 2, ensuring that the lifting frame 2 can move smoothly during lifting. In addition, one-way lubricators are installed at the four corners of the lifting frame 2. The one-way lubricators lubricate the first track 11 of the lifting frame 2, thereby improving the stability of the lifting frame 2 during operation.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A main beam balancing device for a double-girder bridge crane, characterized in that: The system includes a rail beam (1), a lifting frame (2) which is slidably connected to the middle of the rail beam (1), a lifting assembly (3) which is provided on the lifting frame (2), a load-bearing beam (4) which is fixedly connected to both ends of the rail beam (1), a balance block (5) which is fixedly connected to the outside of the load-bearing beam (4), two symmetrically distributed load-bearing rods (6) which are fixedly connected to the balance block (5), a traction assembly (7) which is installed between the load-bearing rods (6) and the rail beam (1), an adjustment frame (8) which is slidably connected to the two load-bearing rods (6), and a connecting assembly (9) which is installed between the adjustment frame (8) and the lifting frame (2). The connecting assembly (9) includes two sets of symmetrically distributed connecting rods (901). The upper end of the connecting rod (901) is fixedly connected to a first sleeve, which is rotatably connected to the adjusting frame (8). The lower end of the connecting rod (901) is fixedly connected to a second sleeve (902), which is rotatably connected to a support rod (904). The support rod (904) is fixedly connected to the lifting frame (2).

2. The main beam balancing device for a double-girder bridge crane according to claim 1, characterized in that: The adjusting frame (8) includes a first support rod (801), a second support rod (802) that slides relative to the first support rod (801) is provided on one side, two sets of first sleeves are rotatably connected to the first support rod (801) and the second support rod (802) respectively, two first sliding sleeves (803) that slide relative to each other are slidably connected on the first support rod (801), two second sliding sleeves (804) that slide relative to each other are slidably connected on the second support rod (802), a hinged connecting rod is installed between the two first sliding sleeves (803) and the two second sliding sleeves (804), and a telescopic rod (805) is fixedly connected between the first support rod and the second support rod, the telescopic rod (805) being located above the hinged connecting rod.

3. A main beam balancing device for a double-girder bridge crane according to claim 1 or 2, characterized in that: The lifting frame (2) is rotatably connected to a first roller (10), and a first track (11) is fitted below the first roller (10). The first track (11) is fixedly connected to the rail support beam (1). The first roller (10) is coaxially fixedly connected to a first pulley (12). A connecting belt (13) is fitted on the first pulley (12). A second pulley (14) is fitted on the connecting belt (13). The second pulley (14) is fitted with a one-way lubricator, which is located outside the first roller (10).

4. The main beam balancing device for a double-girder bridge crane according to claim 3, characterized in that: The one-way lubricator includes a housing (15), an oil storage chamber (16) is provided inside the housing (15), an oil conveying plate (17) is rotatably connected inside the oil storage chamber (16), the oil conveying plate (17) is fixedly connected to the second pulley (14), the oil conveying plate (17) is provided with a ratchet groove (18), the inner side of the housing (15) is provided with an oil storage groove (19) that cooperates with the oil conveying plate (17), the outer end of the oil storage groove (19) is fixedly connected to an oil pipe (25), the lower end of the oil pipe (25) is rotatably connected to a lubrication wheel (20), and the lubrication wheel (20) is located on the side of the first track (11).

5. The main beam balancing device for a double-girder bridge crane according to claim 4, characterized in that: There are two oil storage tanks (19), two oil pipes (25), and two lubrication wheels (20). The oil storage tank (19) is located above the rotation center of the oil conveying plate (17). The oil pipe (25) is provided with an oil outlet hole (21). The lubrication wheel (20) is provided with a through hole. The oil pipe (25) is inclined downward. The two oil pipes (25) are located on both sides of the housing (15). The two lubrication wheels (20) are located on both sides of the first track (11).

6. The main beam balancing device for a double-girder bridge crane according to claim 1, characterized in that: The lifting assembly (3) includes a winch (301), which is rotatably connected to the lifting frame (2). A lifting rope (302) is fitted on the winch (301), and a hook (303) is connected to the lower end of the lifting rope (302).

7. The main beam balancing device for a double-girder bridge crane according to claim 1, characterized in that: Both sides of the lifting frame are fixedly connected to buffer columns (22).

8. The main beam balancing device for a double-girder bridge crane according to claim 1, characterized in that: The traction assembly (7) includes a first hanging ring (701), which is fixedly connected to the rail beam (1). A traction rope (702) is fitted on the first hanging ring (701), and two second hanging rings (703) are fitted on the upper end of the traction rope (702). The two second hanging rings (703) are symmetrically distributed about the first hanging ring (701), and the second hanging rings (703) are fixedly connected to the load-bearing rod (6).

9. A main beam balancing device for a double-girder bridge crane according to claim 1, characterized in that: The load-bearing rod (6) is fixedly connected to a second track (23), and the adjusting frame (8) is rotatably connected to a second roller (24) that cooperates with the second track (23).

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