A luffing tower crane jib head

Abstract

This application discloses a luffing tower crane jib head, including a modularly designed jib head frame, hoisting pulley block, and maintenance basket. The jib head frame consists of a lower section structure, a main chord structure, and a first diagonal web member, which is stable and easy to connect. The lower section structure has detachable and modular outriggers at the bottom, which facilitates support during transportation and installation and reduces weight during operation. One end of the main chord member is firmly connected to the jib section, while the other end is closed to enhance strength. The first diagonal web member and the transverse web member form a triangular structure to distribute the force. The hoisting pulley block is equipped with a rope-stopping device, with the rope-stopping ring and rope-stopping rod providing double protection to prevent the wire rope from detaching and ensuring convenient wire rope passage. In addition, a walkway, handrails, and maintenance basket are provided to offer workers a stable working platform. This application improves the spatial adaptability, safety, and operational efficiency of the luffing tower crane jib head while reducing costs.

Description

Technical Field

[0001] This utility model relates to the field of luffing tower crane technology, specifically to a luffing tower crane jib head. Background Technology

[0002] In the field of tower cranes, luffing jib tower cranes play an indispensable role in various sectors such as construction sites, bridge construction, and port loading and unloading due to their unique dynamic stress condition design. Compared to flat-top tower cranes, luffing jib tower cranes need to withstand more complex and variable dynamic loads during operation, thus requiring more complex and demanding designs for their key components. Among these, the jib head of the luffing jib tower crane, as the core load-bearing component with multiple functions including load-bearing, jib adjustment, jib ratio adjustment, and anti-torsion, directly affects the overall performance, safety, and operational efficiency of the tower crane due to its rational design.

[0003] Most jib head designs on the market are primarily designed for flat-top tower cranes, such as the jib head for a flat-top tower crane disclosed in patent CN112239161B. While this structure can meet the operational requirements of flat-top tower cranes to a certain extent, achieving smooth overhead crane lifting operations through components such as the jib head, connecting mechanism, buffer mechanism, and lubrication mechanism, luffing jib tower cranes, due to the special dynamic stress conditions they operate under, place higher demands on the jib head design. Existing luffing jib tower cranes often employ an integrated jib head design. Although this design is simple, it has many limitations. The integrated jib head is relatively long, limiting the possibility of more jib combinations and reducing spatial adaptability; at the same time, the hoisting wire rope usually passes through the outside of the jib head structure, which not only makes operation inconvenient and affects the efficiency of tower crane installation and dismantling, but also poses a safety hazard of the wire rope detaching from the pulley. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical defects and provide a luffing tower crane jib head, including:

[0005] boom frame, lifting pulley block and maintenance basket;

[0006] The arm head frame adopts a modular design, consisting of a lower plate structure, a main chord structure, and a first diagonal web member connecting the lower plate structure and the main chord structure;

[0007] The lower structure includes a rectangular frame and an internal first square tube and two second diagonal web members. The rectangular frame is composed of two main chord members, the second square tube, and transverse web members.

[0008] One end of the main chord structure is connected to the boom section via an ear plate, and the other end is fixed to the lower structure via a lifting pulley mounting plate.

[0009] The lifting pulley group includes a first lifting pulley group and a second lifting pulley group, both of which are installed on the lifting pulley mounting plate, and a rope-blocking device is provided around the second lifting pulley group;

[0010] The rope-blocking device includes a rope-blocking rod and a rope-blocking ring. The rope-blocking ring is connected by a pair of rope-blocking rod mounting ears and a pair of fixing ears to form an anti-detachment structure.

[0011] In the preferred embodiment of the above technical solution, the lower part of the lower plate structure is provided with two pairs of first leg mounting ears and two pairs of second leg mounting ears. The bottom of the first leg mounting ears is equipped with a detachable assembled leg, and the assembled leg is connected to the second leg mounting ears by a leg diagonal rod.

[0012] In the preferred embodiment of the above technical solution, one end of the main chord is connected to the boom section via a joint, and the other end is a closed end.

[0013] In the preferred embodiment of the above technical solution, there are two first oblique web members. The lower ends of the two first oblique web members are respectively connected to the two ends of the transverse web member, and the upper ends of the two first oblique web members are connected to the lower part of the ear plate. The two first oblique web members and the transverse web member form a triangular structure.

[0014] In the preferred embodiment of the above technical solution, the rope-blocking rod mounting ear plate and the fixed ear plate are respectively disposed on the front and rear sides of the arc-shaped end face under the lifting pulley mounting plate. The rope-blocking ring includes two arc-shaped rods, the two ends of which are respectively connected to the rope-blocking rod mounting ear plate and the fixed ear plate, and an anti-derailment gap is formed between the two arc-shaped rods for the wire rope to pass through.

[0015] In the preferred embodiment of the above technical solution, the rope-blocking rod is horizontally positioned between the two rope-blocking rod mounting ears.

[0016] The preferred embodiment of the above technical solution also includes a walkway and a handrail. The walkway is fixed to the main chord via a walkway mounting base, and the handrail is connected between the maintenance basket and the main chord structure.

[0017] In the preferred embodiment of the above technical solution, the maintenance basket is fixed to the main chord via a maintenance basket mounting base, and a safety wire rope is provided at the upper end of the maintenance basket.

[0018] This application has significant advantages over the prior art: This application has significant advantages over the prior art. To address the limitations of existing luffing tower cranes' integrated jib head structure in terms of jib combination restrictions, poor spatial adaptability, and operational inconvenience and safety hazards caused by the hoisting wire rope passing through externally, this application proposes a modular jib head frame design. This frame is cleverly combined with a lower section structure, main chord structure, and first diagonal web member, ensuring stability and facilitating connection to other components. It also features prefabricated outriggers for support during transport and installation, which can be removed during operation to reduce weight and improve lifting performance. The main chord is securely connected to the jib section and its other end is sealed, enhancing its strength and preventing debris from entering. The first diagonal web member and the transverse web member form a triangular structure, effectively distributing and bearing forces from all directions, reducing deformation and vibration. The hoisting pulley block is equipped with a rope-blocking device; the rope-blocking ring and rope-blocking rod work together to form a double protection system, preventing the wire rope from detaching from the pulley block. The design of the hoisting wire rope's path is convenient and cost-effective. Furthermore, a walkway, handrails, and maintenance basket are provided to offer workers a stable working platform and ensure their safety. Overall, this application improves the spatial adaptability, safety, and operational efficiency of the luffing jib tower crane jib head while reducing costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the boom head of a luffing tower crane according to this application;

[0020] Figure 2 This is a partial structural diagram of the boom head of a luffing tower crane according to this application;

[0021] Figure 3 This is an enlarged schematic diagram of the rope-blocking device at the jib head of a luffing tower crane according to this application.

[0022] As shown in the figure: 1. Lower structure, 11. First square tube, 12. Second diagonal web member, 13. Main chord member, 14. Second square tube, 15. Horizontal web member, 16. Maintenance basket mounting base, 17. Walkway mounting base, 18. First leg mounting ear plate, 19. First leg mounting ear plate, 2. Main chord structure, 21. Ear plate, 22. Lifting pulley mounting plate, 23. Rope guide rod, 24. Rope guide rod mounting ear plate, 25. Fixed ear plate, 3. First lifting pulley block, 4. Second lifting pulley block, 5. First diagonal web member, 6. Maintenance basket, 7. Walkway, 8. Handrail, 9. Prefabricated outriggers. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0025] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0026] To make the content of this utility model easier to understand, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0027] Reference Appendix Figure 1 -Appendix Figure 3 The technical problem to be solved by this utility model is to overcome the above-mentioned technical defects and provide a boom head for a luffing tower crane, including: a boom head frame, a lifting pulley block and a maintenance basket 6; the boom head frame adopts a modular design and is composed of a lower structure 1, a main chord structure 2 and a first diagonal brace 5 connecting the lower structure 1 and the main chord structure 2; the lower structure 1 includes a rectangular frame and an internal first square tube 11 and two second diagonal braces 12, the rectangular frame is composed of two main chords 13, a second square tube 14 and a transverse brace 15; one end of the main chord structure 2 is connected to the boom section through an ear plate 21, and the other end is fixed to the lower structure 1 through a lifting pulley mounting plate 22; the lifting pulley block includes a first lifting pulley block 3 and a second lifting pulley block 4, both of which are installed on the lifting pulley mounting plate 22, and a rope-blocking device is provided around the second lifting pulley block 4; the lifting pulley mounting plate 22 adopts a lightweight design to reduce the overall weight of the boom head and improve the overall lifting performance of the machine. The rope-blocking device includes a rope-blocking rod 23 and a rope-blocking ring 26. The rope-blocking ring 26 is connected by a pair of rope-blocking rod mounting ears 24 and a pair of fixing ears 25 to form an anti-detachment structure.

[0028] First, the boom head frame adopts a modular design concept, cleverly combining a lower structure 1, a main chord structure 2, and a first diagonal web member 5 connecting the lower structure 1 and the main chord structure 2. The lower structure 1 is ingeniously designed, comprising a rectangular frame and an internal first square tube 11 and two second diagonal web members 12. The rectangular frame is constructed from two main chord members 13, a second square tube 14, and transverse web members 15. This structure is not only stable but also provides a solid foundation for subsequent connections with other components.

[0029] Furthermore, the lower section of the structure 1 is meticulously equipped with two pairs of first leg mounting lugs 18 and two pairs of second leg mounting lugs 19. A detachable prefabricated outrigger 9 is mounted at the bottom of the first leg mounting lug 18, and a leg diagonal brace connects the prefabricated outrigger 9 to the second leg mounting lug 19. The prefabricated outrigger 9 plays a crucial role during transportation, effectively supporting the boom head and preventing damage due to swaying during transport. During on-site installation, the prefabricated outrigger 9 also supports the entire boom assembly, ensuring stability during installation. Before the tower crane begins operation, it can be removed, reducing the overall weight of the boom head and further improving the tower crane's lifting performance, providing a strong guarantee for the efficient operation of the tower crane.

[0030] As a crucial component of the boom head frame, the main chord 13 is tightly connected at one end to the boom section via a joint. This connection method ensures the stability between the main chord 13 and the boom section, allowing it to withstand the enormous tensile and compressive forces generated by the tower crane during operation. The other end of the main chord 13 is designed as a closed end. This closed structure not only enhances the strength of the main chord 13 itself but also effectively prevents external debris from entering its interior, avoiding any impact on its performance due to debris accumulation. This ensures stable operation of the tower crane under various complex working conditions.

[0031] In the boom head frame, the placement of the first diagonal web members 5 is crucial. Two first diagonal web members 5 are installed here, their lower ends precisely connected to both ends of the horizontal web member 15, while their upper ends are connected together below the ear plate 21. The two first diagonal web members 5 and the horizontal web member 15 cleverly form a triangular structure. This triangular structure possesses extremely high stability, effectively distributing and bearing forces from all directions during tower crane operation, reducing deformation and vibration of the boom head frame, providing reliable support for the boom head, and ensuring the safety and stability of tower crane lifting operations.

[0032] The hoisting pulley block plays a crucial role in tower crane hoisting operations, and the rope-stopping device is an important component ensuring its normal operation. The rope-stopping rod mounting lug 24 and the fixed lug 25 are respectively located on the front and rear sides of the lower arc-shaped end face of the hoisting pulley mounting plate 22. The rope-stopping ring 26 consists of two arc-shaped rods, with both ends securely connected to the rope-stopping rod mounting lug 24 and the fixed lug 25, respectively. A gap is formed between the two arc-shaped rods to prevent the wire rope from slipping through. This design effectively confines the wire rope within a specific range when passing through the hoisting pulley block, preventing it from detaching and significantly improving the safety of tower crane hoisting operations.

[0033] The rope-stop bar 23 is positioned horizontally between the two rope-stop bar mounting ears 24, its location carefully designed. The hoisting wire rope passes through the top groove of the first hoisting pulley block 3, through the space between the hoisting pulley mounting plates 22, and exits on the right side of the second hoisting pulley block 4, directly connecting to the hook. This facilitates installation, saves labor costs, reduces installation and dismantling costs, and improves economic efficiency. During the tower crane's luffing process, the tangent point between the wire rope and the pulley is constantly changing. The rope-stop bar 23 acts as a stop, preventing the wire rope from jumping out of the pulley groove due to the changing tangent point. Together with the rope-stop ring 26, it forms a double protection system, further reducing the risk of the wire rope detaching from the pulley block and providing double protection for the safe operation of the tower crane.

[0034] To facilitate maintenance and repair work such as scaling and boom head operation during future use, this utility model also includes a walkway 7 and a handrail 8. The walkway 7 is securely fixed to the main chord 13 via a walkway mounting base 17, providing workers with a stable working platform. The handrail 8 connects the maintenance basket 6 and the main chord structure 2. When workers walk or work on the walkway 7, they can hold onto the handrail 8, increasing their balance and stability, effectively preventing falls, and providing reliable protection for worker safety.

[0035] The maintenance suspended platform 6 is a crucial location for workers performing high-altitude operations, and its securing method and safety measures are of paramount importance. The maintenance suspended platform 6 is securely fixed to the main chord 13 via the maintenance suspended platform mounting base 16, ensuring that it will not sway or fall off during use. Furthermore, a safety wire rope is installed at the upper end of the maintenance suspended platform 6. This safety wire rope provides secondary protection in the event of an accident, further ensuring the safety of workers and providing them with a safe and reliable working environment.

[0036] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A boom head for a luffing tower crane, characterized in that, include: boom head frame, lifting pulley block and maintenance basket (6); The arm head frame adopts a modular design and consists of a lower plate structure (1), a main chord structure (2), and a first inclined web member (5) connecting the lower plate structure (1) and the main chord structure (2). The lower structure (1) includes a rectangular frame and an internal first square tube (11) and two second diagonal web members (12). The rectangular frame is composed of two main chord members (13), a second square tube (14) and a transverse web member (15). One end of the main chord structure (2) is connected to the boom section of the crane arm via an ear plate (21), and the other end is fixed to the lower plate structure (1) via a lifting pulley mounting plate (22). The lifting pulley group includes a first lifting pulley group (3) and a second lifting pulley group (4), both of which are installed on the lifting pulley mounting plate (22), and a rope-blocking device is provided around the second lifting pulley group (4); The rope-blocking device includes a rope-blocking rod (23) and a rope-blocking ring (26). The rope-blocking ring (26) is connected by a pair of rope-blocking rod mounting ears (24) and a pair of fixing ears (25) to form an anti-detachment structure.

2. The boom head of a luffing tower crane according to claim 1, characterized in that, The lower part of the lower structure (1) is provided with two pairs of first leg mounting ear plates (18) and two pairs of second leg mounting ear plates (19). The bottom of the first leg mounting ear plate (18) is equipped with a detachable assembled leg (9). The assembled leg (9) and the second leg mounting ear plate (19) are connected by a leg diagonal rod.

3. The boom head of a luffing tower crane according to claim 1, characterized in that, One end of the main chord (13) is connected to the boom section of the crane arm via a joint, and the other end is a closed end.

4. The boom head of a luffing tower crane according to claim 1, characterized in that, There are two first oblique web members (5). The lower ends of the two first oblique web members (5) are respectively connected to the two ends of the horizontal web member (15). The upper ends of the two first oblique web members (5) are connected to the lower part of the ear plate (21). The two first oblique web members (5) and the horizontal web member (15) form a triangular structure.

5. The boom head of a luffing tower crane according to claim 1, characterized in that, The rope-blocking rod mounting ear plate (24) and the fixed ear plate (25) are respectively set on the front and rear sides of the lower arc-shaped end face of the lifting pulley mounting plate (22). The rope-blocking ring (26) includes two arc-shaped rods. The two ends of the arc-shaped rods are respectively connected to the rope-blocking rod mounting ear plate (24) and the fixed ear plate (25), and an anti-derailment gap is formed between the two arc-shaped rods for the wire rope to pass through.

6. The boom head of a luffing tower crane according to claim 5, characterized in that, The rope-stopping rod (23) is placed horizontally between the two rope-stopping rod mounting ears (24).

7. The boom head of a luffing tower crane according to claim 1, characterized in that, It also includes a walkway (7) and a handrail (8). The walkway (7) is fixed to the main chord (13) by a walkway mounting base (17), and the handrail (8) is connected between the maintenance basket (6) and the main chord structure (2).

8. The boom head of a luffing tower crane according to claim 1, characterized in that, The maintenance basket (6) is fixed to the main chord (13) by the maintenance basket mounting seat (16), and a safety wire rope is provided at the upper end of the maintenance basket (6).

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