Combined large hook and hoisting apparatus

Abstract

The application relates to the field of crane hooks, and discloses a combined large hook and hoisting equipment. The combined large hook comprises a first connecting beam, a combined pulley set, a first balance beam and a second balance beam. The combined pulley set is connected to the first connecting beam, the combined pulley set comprises a pulley set and a second connecting beam, and the pulley set is connected to the second connecting beam. The first balance beam is connected to the lower end of the combined pulley set. The upper end of the second balance beam is connected to the first balance beam, and the lower end of the second balance beam is connected to a hook. The combined pulley set and the first connecting beam are connected to a first connecting point, and the combined pulley set and the first balance beam are connected to a second connecting point. The first connecting point and the second connecting point are symmetrical about the vertical central axis of the combined pulley set. The two-stage connecting beam-balance beam structure realizes the modular configuration of the pulley set, provides more abundant hoisting weight gradient selection, significantly improves the overall stress state of the pulley set, and effectively reduces the eccentric moment.

Description

Technical Field

[0001] This application belongs to the field of crane hook technology, specifically relating to a combined large hook and lifting equipment. Background Technology

[0002] In existing technologies, to meet the heavy-duty lifting requirements of cranes, modular hook assemblies typically employ an eccentric hinge structure to achieve multi-condition adaptability. The core lifting unit consists of two pulley blocks, each wound with an independent wire rope. Switching between different lifting capacities is achieved by combining the eccentric hinge points of the left and right pulley blocks or using the middle hinge point alone. While this design balances economy and lifting capacity through modular combination, significant drawbacks of its hinge mechanism have been found in practical applications. First, the eccentric hinge layout causes eccentric moments in individual pulley blocks, affecting the uniformity of force distribution. Second, the eccentric hinge limits the distance between the center of the pulley block and the hinge point, further limiting the maximum number of pulleys in a single pulley block. Moreover, when there is a difference in the number of pulleys on the left and right sides of the modular hook assembly, an additional eccentric moment positively correlated with the difference in the number of pulleys is generated because the point of application of the wire rope tension deviates from the geometric center of the system.

[0003] The core contradiction of existing technology lies in the conflict between the scalability of the combination mode and the uniformity of force distribution. This contradiction is particularly prominent when pursuing high-ratio, large-tonnage working conditions. To achieve a larger lifting capacity, the number of pulleys needs to be increased, but the increase in the difference in the number of pulley groups exacerbates the risk of system off-center loading. Summary of the Invention

[0004] In view of at least one of the above-mentioned defects or deficiencies in the prior art, this application provides a combined large hook that can achieve multiple combinations and ensure uniform force distribution on the pulley block.

[0005] To achieve the above objectives, this application provides a combined large lifting hook, which includes:

[0006] First connecting beam;

[0007] A combined pulley system is connected to the first connecting beam. The combined pulley system includes a pulley assembly and a second connecting beam, and the pulley assembly is connected to the second connecting beam.

[0008] The first balance beam is connected to the lower end of the combined pulley block;

[0009] The second balance beam is connected to the first balance beam at its upper end and has a hook connected to its lower end.

[0010] The combined pulley system is connected to the first connecting beam at a first connection point, and the combined pulley system is connected to the first balance beam at a second connection point. Both the first connection point and the second connection point are symmetrical about the vertical central axis of the combined pulley system.

[0011] In some embodiments, the first connecting beam includes a first connecting hole and a second connecting hole symmetrically arranged about the first connecting hole. The second connecting beam is connected to the combined pulley block through the second connecting hole, and the first connecting hole is used to connect to the lifting equipment.

[0012] In some embodiments, the second connecting beam includes a third connecting hole and a fourth connecting hole. The third connecting hole is located at the center of the second connecting beam and is used to form the first connecting point by hinge with the second connecting hole of the first connecting beam via a pin. The fourth connecting hole is located below the third connecting hole and is used to connect with the pulley block.

[0013] In some embodiments, the combined pulley system includes at least two pulley systems symmetrically arranged on the second connecting beam, and at least two pulley systems are connected to the first balance beam to form a second connection point.

[0014] In some embodiments, the first balance beam includes two conversion pull plates, each having a large hinge hole and a small hinge hole. The large hinge hole is used for hinged to the second balance beam via a pin, and the small hinge hole is used for connection to the pulley block.

[0015] In some embodiments, the two conversion pull plates are placed laterally and arranged in a mirror-symmetrical manner, with one conversion pull plate stacked on top of the other to form a stacked structure, and the central axes of the large hinge holes of the two conversion pull plates are collinear and concentric.

[0016] In some embodiments, the two conversion pull plates are placed vertically and arranged in a mirror-symmetrical manner, with one conversion pull plate stacked on top of the other to form a stacked structure, and the central axes of the large hinge holes of the two conversion pull plates are collinear and concentric.

[0017] In some embodiments, the second balance beam includes a first connecting portion and an upper hinge hole disposed on the first connecting portion, the upper hinge hole being used for connection with the first balance beam.

[0018] In some embodiments, the second balance beam further includes a second connecting portion connected below the first connecting portion, the second connecting portion having a lower hinge hole at its center for connection with the hook.

[0019] A second aspect of this application provides a lifting device, which includes the combined large hook described in any one of the preceding claims.

[0020] Through the above technical solution, the present invention provides a combined large hook in which the upper side of the pulley block is connected to the second connecting beam and the lower side is connected to the first balance beam. On this basis, the upper side is connected to the connecting beam again and the lower side is connected to the second balance beam. The multi-level combination structure of the two-level connecting beam-balance beam realizes the modular configuration of the pulley block, supports the diversified configuration of the pulley block, supports the flexible combination of the number and connection method of the pulley block, and provides a richer selection of lifting capacity gradients. Under this connection structure, the key connection points are symmetrically arranged about the vertical central axis of the combined pulley block, which significantly improves the overall stress state of the pulley block, effectively reduces the eccentric moment, and makes the stress of each pulley block more uniform.

[0021] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0023] Figure 1 This is a schematic diagram of an embodiment of the combined large hook of this utility model;

[0024] Figure 2 This is a structural diagram of the conversion pull plate of the combined large hook in this utility model;

[0025] Figure 3 for Figure 1 A schematic diagram of the first balance beam in the embodiment;

[0026] Figure 4 This is a schematic diagram of another embodiment of the combined large hook of this utility model;

[0027] Figure 5 for Figure 4 A schematic diagram of the first balance beam in the embodiment;

[0028] Explanation of reference numerals in the attached figures

[0029] Detailed Implementation

[0030] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0031] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0032] like Figure 1 As shown, this application provides a combined large hook, including a first connecting beam 10, a combined pulley block 20, a first balance beam 30, and a second balance beam 40; the combined pulley block 20 is connected to the first connecting beam 10, and the combined pulley block 20 includes a pulley block 21 and a second connecting beam 22, with the pulley block 21 connected to the second connecting beam 22; the first balance beam 30 is connected to the lower end of the combined pulley block 20; the upper end of the second balance beam 40 is connected to the first balance beam 30, and the lower end is connected to a hook 43; wherein, the combined pulley block 20 is connected to the first connecting beam 10 at a first connection point, and the combined pulley block 20 is connected to the first balance beam 30 at a second connection point, and both the first connection point and the second connection point are symmetrical about the vertical central axis of the combined pulley block 20. It is understandable that both the first connection point and the second connection point are symmetrical about the vertical central axis of the combined pulley system 20, indicating that the first connection point and the second connection point can be located on the vertical central axis of the combined pulley system 20, or they can be symmetrical about the vertical central axis of the combined pulley system 20.

[0033] The number of pulley groups 21 included in the combined pulley block 20 can be adjusted according to actual usage. The connection point between the combined pulley block 20 and the first connecting beam 10 is the first connection point. The position of this first connection point must be symmetrical about the vertical central axis of the combined pulley block 20 itself. This means that regardless of the specific number and arrangement of pulleys inside the combined pulley block 20, the interface (i.e., the first connection point) of its physical connection with the upper first connecting beam 10 must be symmetrical about the vertical center line of the combined pulley block 20 module in space. This symmetrical design is key to ensuring the symmetry of the initial load transfer path. Similarly, the connection point between the combined pulley block 20 and the lower first balance beam 30 is the second connection point. The position of this second connection point must also be symmetrical about the vertical central axis of the combined pulley block 20 itself. Therefore, the combined pulley block 20 not only has a symmetrical first connection point at its upper end (where it connects to the first connecting beam 10), but also a symmetrical second connection point at its lower end (where it connects to the first balance beam 30). This ensures that the combined pulley block 20, as a single module, has its upper and lower connecting interfaces strictly symmetrical about its own central axis. By ensuring the symmetry of the upper and lower connecting points of the combined pulley block 20, the line of action of the resultant force of the loads acting on the combined pulley block 20 can be as close as possible to or coincide with the vertical central axis of the combined pulley block 20. This symmetrical arrangement minimizes the eccentric moment caused by the eccentricity of the connecting points, thereby optimizing the stress state of the internal components of the combined pulley block 20, making it mainly bear axial tensile or compressive forces, rather than additional bending stresses, thus improving the load-bearing efficiency and stability of the structure.

[0034] The combined pulley block 20 supports the first connecting beam 10 (typically connected to the crane boom or lifting frame) above, and the first balance beam 30 below. The first balance beam 30 further connects to the second balance beam 40, ultimately suspending the hook 43. This multi-stage structural design allows the entire modular large hook system to be modularly combined by configuring pulley blocks 21 of different numbers and specifications (within the combined pulley block 20), providing different lifting capacity gradients. With various pulley block configurations 21, good load transfer symmetry is maintained, effectively suppressing off-center loading. The two-stage balance beam design further optimizes the suspension posture of the hook 43 and the deflection angle of the wire rope. Ultimately, the entire system works collaboratively to achieve safe, stable, and efficient lifting of large, heavy objects.

[0035] The present invention provides a combined large hook in which the upper side of the pulley block 21 is connected to the second connecting beam 22 and the lower side is connected to the first balance beam 30. On this basis, the upper side is further connected to the connecting beam and the lower side is further connected to the second balance beam 40. The combination structure of the two-stage connecting beam-balance beam realizes the modular configuration of the pulley block 21, supports the diversified configuration of the pulley block 21, supports the flexible combination of the number and connection method of the pulley blocks 21, and provides a richer selection of lifting capacity gradients. Under this connection structure, the key connection points are symmetrically arranged about the vertical central axis of the combined pulley block 20, which significantly improves the overall stress state of the pulley block 21, effectively reduces the eccentric moment, and makes the stress of each pulley block 21 more uniform.

[0036] In some embodiments, the first connecting beam 10 includes a first connecting hole 11 and second connecting holes 12 symmetrically arranged about the first connecting hole 11. The second connecting beam 22 is connected to the combined pulley block 20 through the second connecting holes 12. The first connecting hole 11 is used for connection with lifting equipment; that is, the first connecting hole 11 is an interface for connecting the crane boom, lifting frame, or other upper-level load-bearing structure to the first connecting beam 10 through connecting parts such as pins and lifting rings. To ensure balanced force distribution on the first connecting beam 10, the first connecting hole 11 can be located at the horizontal center of the first connecting beam 10. The number of second connecting holes 12 can be one or more, depending on the number of combined pulley blocks 20. The position of the second connecting hole 12 is symmetrical about the position of the first connecting hole 11. The first connecting hole 11 is located at the horizontal center of the first connecting beam 10. Therefore, the position of the second connecting hole 12 can be symmetrically arranged on the first connecting beam 10, so that the combined pulley block 20 is symmetrically connected to the first connecting beam 10. This ensures that the load from the lifting equipment is transmitted to the combined pulley block 20 through the symmetrically arranged second connecting holes 12, which can maintain the symmetry of the load transmission path and effectively reduce the eccentric moment on the first connecting beam 10 and the combined pulley block 20.

[0037] In some embodiments, the second connecting beam 22 includes a third connecting hole 221 and a fourth connecting hole 222. The third connecting hole 221 is located at the center of the second connecting beam 22, that is, the third connecting hole 221 is located at the geometric center of the second connecting beam 22 along its length, or more precisely, on its vertical central axis (which coincides with or is parallel to the vertical central axis of the combined pulley block 20). It is used to form a first connection point with the second connecting hole 12 of the first connecting beam 10 by means of a pin. Specifically, the pin passes through both the second connecting hole 12 of the first connecting beam 10 and the third connecting hole 221 of the second connecting beam 22, realizing the hinged connection between the two. This connection point constitutes the first connection point. The fourth connecting hole 222 is located below the third connecting hole 221 and is used to connect with the pulley block 21.

[0038] In some embodiments, the combined pulley block 20 includes at least two pulley blocks 21, which are symmetrically arranged on the second connecting beam 22. Each of the at least two pulley blocks 21 is connected to the first balance beam 30 to form a second connection point. It is understood that the number of fourth connecting holes 222 can be set according to the number of pulley blocks 21. To ensure the balance of the pulley blocks 21, the fourth connecting holes 222 can be symmetrically arranged in the horizontal direction of the second connecting beam 22. The combined pulley block 20 can achieve modular configuration of the number and spatial layout of pulley blocks 21 by selecting and connecting different numbers and positions of pulley blocks 21 according to actual lifting capacity requirements, providing different lifting capacity gradient options for the diverse combination functions of the combined pulley block 20.

[0039] In some embodiments, the first balance beam 30 includes two transition plates 31, such as Figure 2 As shown, the conversion pull plate 31 has a large hinge hole 311 and a small hinge hole 312. The large hinge hole 311 is used to be hinged to the second balance beam 40 by a pin, and the small hinge hole 312 is used to connect to the pulley block 21. Since there are at least two pulley blocks 21, the number of small hinge holes 312 can also be set to multiple.

[0040] In some implementations, such as Figure 1 and Figure 3 As shown, the two conversion pull plates 31 are placed horizontally and arranged in a mirror symmetrical manner, with one conversion pull plate 31 stacked on top of the other conversion pull plate 31 to form a stacked structure, and the central axes of the large hinge holes 311 of the two conversion pull plates 31 are collinear and concentric.

[0041] In this embodiment, the second connecting holes 12 of the first connecting beam 10 are respectively connected to a combined pulley group 20. Each combined pulley group 20 includes three pulley groups 21, with the three pulley groups 21 having five, seven, and five pulleys respectively. The three pulley groups 21 are symmetrically arranged on the second connecting beam 22. Because there are a large number of pulley groups 21, the combined pulley group 20 is relatively long in its width direction. One conversion plate 31 is not enough to connect all the pulley groups 21. It can be considered to use two conversion plates 31 to be stacked alternately to extend the length of the conversion plate 31 in order to connect all the pulley groups 21. The staggered stacking significantly saves lateral space, making the entire combined large hook system more compact in the width direction. To avoid uneven stress caused by the shape of the conversion pull plates 31, the two conversion pull plates 31 are placed horizontally and arranged in a mirror-symmetrical manner, ensuring that they remain symmetrical even when stacked. The central axes of the large hinge holes 311 of the two conversion pull plates 31 are collinear and concentric. A pin can be used to pass through the two large hinge holes 311 and the upper hinge hole 411 of the second balance beam 40 to fix the two conversion pull plates 31 and the second balance beam 40. Specifically, the placement effect of the conversion pull plates 31 is as follows: Figure 2As shown, the pulleys are hinged to three pulley blocks 21 through holes L1, L2, and L3 in the small hinge hole 312. The holes L1, L2, and L3 connected to the pulley blocks 21 are the second connection points. The second connection points are symmetrical about the vertical central axis of the combined pulley block 20. Moreover, the connection point between the third connection hole 221 on the second connecting beam 22 and the second connection hole 12 on the first connecting beam 10, and the connection point between the first balance beam 30 and the second balance beam 40, are located on the vertical central axis of the combined pulley block 20. This allows the load force transmitted through them to be automatically balanced in the lateral direction, effectively suppressing lateral load imbalance.

[0042] In some implementations, such as Figure 4 and Figure 5 As shown, the two conversion pull plates 31 are placed vertically and arranged in a mirror symmetrical manner, with one conversion pull plate 31 stacked on top of the other conversion pull plate 31 to form a stacked structure, and the central axes of the large hinge holes 311 of the two conversion pull plates 31 are collinear and concentric.

[0043] In this embodiment, the second connecting holes 12 of the first connecting beam 10 are respectively connected to a combined pulley group 20. Each combined pulley group 20 includes two pulley groups 21, and the number of pulleys in each pulley group 21 is five. The two pulley groups 21 are symmetrically arranged on the second connecting beam 22. Although one conversion plate 31 is sufficient to connect all pulley groups 21, in order to avoid uneven force distribution caused by the shape of the conversion plate 31, the two conversion plates 31 are placed vertically and arranged in a mirror symmetrical manner. The vertical placement and staggered stacking significantly save the lateral space of the combined pulley group, making the entire combined large hook system more compact in the width direction. The two conversion plates 31 are still symmetrical left and right after being stacked. The central axes of the large hinge holes 311 of the two conversion plates 31 are collinear and concentric. A pin can be used to pass through the two large hinge holes 311 and the upper hinge hole 411 of the second balance beam 40 to fix the two conversion plates 31 and the second balance beam 40. Specifically, the placement effect of the conversion plate 31 is as follows: Figure 4 As shown, the pulleys are hinged to two pulley blocks 21 through holes L4 and L5 in the small hinge hole 312. The holes L4 and L5 connected to the pulley blocks 21 are the second connection points. The second connection points are symmetrical about the vertical central axis of the combined pulley block 20. Moreover, the connection point between the third connection hole 221 on the second connecting beam 22 and the second connection hole 12 on the first connecting beam 10, and the connection point between the first balance beam 30 and the second balance beam 40, are located on the vertical central axis of the combined pulley block 20. This allows the load force transmitted through them to be automatically balanced in the lateral direction, effectively suppressing lateral load imbalance.

[0044] It is understood that the above embodiment is only an example of the possible ways to implement the combined large hook, and does not represent all the combination methods of the combined large hook. The pulley group 21 of the combined large hook can also be other numbers to form different combination gradients.

[0045] In some embodiments, the second balance beam 40 includes a first connecting portion 41 and an upper hinge hole 411 disposed on the first connecting portion 41, the upper hinge hole 411 being used for connection with the first balance beam 30. The first connecting portion 41 is disposed on the upper part of the second balance beam 40 for easy connection with the first balance beam 30, and the second balance beam 40 and the first balance beam 30 are hinged at the upper hinge hole 411 by a pin for easy disassembly. The pin can be a through shaft or two short shafts, and no specific limitation is made here.

[0046] In some embodiments, the second balance beam 40 further includes a second connection portion 42 connected below the first connection portion 41. The center of the second connection portion 42 is provided with a lower hinge hole 421 for connecting with the hook 43, ensuring that the suspension point of the hook 43 is located on the vertical central axis of the second balance beam 40. This effectively eliminates the additional torque caused by the eccentricity of the connection point of the hook 43, significantly reduces the risk of the hook 43 swaying or rotating undesirably during the lifting process, and improves the stability of the lifting of heavy objects.

[0047] A second aspect of this application provides a lifting device, which includes a combined large hook as described above, wherein the combined large hook is connected to the device therein through a first connecting hole 11 on a first connecting beam 10.

[0048] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A combined large lifting hook, characterized in that, The combined large lifting hook includes: First connecting beam (10); A combined pulley block (20) is connected to the first connecting beam (10). The combined pulley block (20) includes a pulley block (21) and a second connecting beam (22). The pulley block (21) is connected to the second connecting beam (22). The first balance beam (30) is connected to the lower end of the combined pulley block (20); The second balance beam (40) is connected to the first balance beam (30) at its upper end and to a hook (43) at its lower end. The combined pulley group (20) is connected to the first connecting beam (10) at a first connection point, and the combined pulley group (20) is connected to the first balance beam (30) at a second connection point. Both the first connection point and the second connection point are symmetrical about the vertical central axis of the combined pulley group (20).

2. The combined large lifting hook according to claim 1, characterized in that, The first connecting beam (10) includes a first connecting hole (11) and a second connecting hole (12) symmetrically arranged about the first connecting hole (11). The second connecting beam (22) is connected to the combined pulley group (20) through the second connecting hole (12). The first connecting hole (11) is used to connect to the lifting equipment.

3. The combined large lifting hook according to claim 2, characterized in that, The second connecting beam (22) includes a third connecting hole (221) and a fourth connecting hole (222). The third connecting hole (221) is located at the center of the second connecting beam (22) and is used to form the first connection point by hinge with the second connecting hole (12) of the first connecting beam (10) through a pin. The fourth connecting hole (222) is located below the third connecting hole (221) and is used to connect with the pulley block (21).

4. The combined large lifting hook according to claim 3, characterized in that, The combined pulley group (20) includes at least two pulley groups (21), which are symmetrically arranged on the second connecting beam (22). At least two pulley groups (21) are connected to the first balance beam (30) to form a second connection point.

5. The combined large lifting hook according to any one of claims 1 to 4, characterized in that, The first balance beam (30) includes two conversion pull plates (31), which have a large hinge hole (311) and a small hinge hole (312). The large hinge hole (311) is used to be hinged to the second balance beam (40) by a pin, and the small hinge hole (312) is used to be connected to the pulley block (21).

6. The combined large lifting hook according to claim 5, characterized in that, The two conversion pull plates (31) are placed horizontally and arranged in a mirror symmetrical manner, with one conversion pull plate (31) stacked on the other conversion pull plate (31) to form a stacked structure, and the central axes of the large hinge holes (311) of the two conversion pull plates (31) are collinear and concentric.

7. The combined large lifting hook according to claim 5, characterized in that, The two conversion pull plates (31) are placed vertically and arranged in a mirror symmetrical manner, with one conversion pull plate (31) stacked on top of the other conversion pull plate (31) to form a stacked structure. The central axes of the large hinge holes (311) of the two conversion pull plates (31) are collinear and concentric.

8. The combined large lifting hook according to any one of claims 1 to 4, characterized in that, The second balance beam (40) includes a first connecting part (41) and an upper hinge hole (411) disposed on the first connecting part (41), the upper hinge hole (411) being used to connect with the first balance beam (30).

9. The combined large lifting hook according to claim 8, characterized in that, The second balance beam (40) also includes a second connection part (42) connected below the first connection part (41), and the center of the second connection part (42) is provided with a lower hinge hole (421) for connecting with the hook (43).

10. A lifting device, characterized in that, The lifting equipment includes the combined large hook as described in any one of claims 1 to 9.

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