Luffing mechanism for crane and crane

Abstract

The invention relates to the field of engineering machinery, and discloses a luffing mechanism for a crane and the crane, the luffing mechanism comprises a transition support, a luffing frame, a supporting leg, a pulling plate and a hoisting mechanism, the transition support is of a box type structure, the fixed end of the luffing frame is hinged to the transition support, the supporting leg is connected to the movable end of the luffing frame, and the pulling plate is arranged on the transition support. The variable-amplitude frame is vertically arranged at the bottom of the movable end of the variable-amplitude frame when folded above the transition support, one end of the pulling plate is hinged to the movable end of the variable-amplitude frame, the other end of the pulling plate is hinged to the transition support, and the hoisting mechanism is installed on the transition support. The luffing mechanism comprises the transition support of the box type structure, the stability of the luffing mechanism in the transportation process can be remarkably improved, the situation of rollover damage is avoided, meanwhile, the installation process of the luffing mechanism is greatly simplified, the installation efficiency is effectively improved, and the workload is effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery, specifically, it relates to a luffing mechanism for a crane and a crane. Background Technology

[0002] The luffing mechanism is an important component of the crane, mainly consisting of the luffing frame, the hoisting mechanism, and the tie plate. The fixed end of the luffing frame is hinged to the rear section of the turntable. One end of the tie plate is hinged to the movable end of the luffing frame, and the other end is hinged to the rear end of the turntable. The hoisting mechanism is mounted on the turntable and connected to the pulley on the movable end of the luffing frame via a wire rope. The hoisting mechanism drives the luffing frame to pitch by winding and unwinding the rope, and the pitching motion of the luffing frame drives the crane boom to pitch to achieve luffing.

[0003] In existing luffing mechanisms, transportation is typically carried out as a separate unit. Support legs are installed at both ends of the luffing frame, with the end connecting the tie plate to the turntable and the hoisting mechanism respectively attached to the frame. During transport, the entire luffing mechanism is supported by the two support legs. This support method has poor stability and is prone to tipping over, causing damage. Furthermore, installation on the turntable requires detaching the tie plate and the hoisting mechanism from the luffing frame and then connecting them to the turntable, making the installation process complex and cumbersome. Summary of the Invention

[0004] In view of the above-mentioned shortcomings or defects in the prior art, the present invention provides a luffing mechanism for a crane and a crane, aiming to solve the technical problems of poor stability of the luffing mechanism during transportation and the complicated and cumbersome installation process.

[0005] To achieve the above objectives, the present invention provides a luffing mechanism for a crane, the luffing mechanism comprising:

[0006] The transition support includes a first support plate, a second support plate, and two connecting side plates. The first support plate and the second support plate are spaced apart and opposite to each other along a first horizontal direction. The two connecting side plates are respectively connected between the first support plate and the second support plate and are spaced apart and opposite to each other along a second horizontal direction perpendicular to the first horizontal direction. The top and bottom of the first support plate are respectively provided with a luffing frame hinge seat and a first turntable hinge seat. The top and bottom of the second support plate are respectively provided with a pull plate hinge seat and a second turntable hinge seat.

[0007] The fixed end of the luffing frame is hinged to the luffing frame hinge seat;

[0008] A support leg is connected to the movable end of the luffing frame and is vertically positioned at the bottom of the movable end of the luffing frame when the luffing frame is folded above the transition support.

[0009] The pull plate has one end hinged to the movable end of the luffing frame and the other end hinged to the pull plate hinge seat;

[0010] The hoisting mechanism is mounted on the transition support.

[0011] Optionally, when the luffing frame is folded above the transition support, the support surface formed by the bottom of the support leg, the bottom lower edge of the first support plate, and the bottom lower edge of the second support plate is lower than the lowest point of the pull plate in the drooping state; or, the support surface formed by the bottom of the support leg, the first turntable hinge seat, and the second turntable hinge seat is lower than the lowest point of the pull plate in the drooping state.

[0012] Optionally, the first support plate is a trapezoidal structure that is narrower at the top and wider at the bottom.

[0013] Optionally, the top of the first support plate is provided with a luffing frame hinge seat at each of the two ends in the second horizontal direction, and the bottom of the first support plate is provided with a first turntable hinge seat at each of the two ends in the second horizontal direction.

[0014] Optionally, the hoisting mechanism is mounted on the two connecting side plates and located between the two connecting side plates.

[0015] Optionally, a telescopic drive hinge seat is fixedly connected to the connecting side plate, and the luffing mechanism further includes a telescopic drive, one end of which is hinged to the telescopic drive hinge seat, and the other end is hinged to the luffing frame.

[0016] Optionally, the first support plate gradually tilts from bottom to top in a direction close to the second support plate, and the second support plate gradually tilts from bottom to top in a direction away from the first support plate.

[0017] Optionally, the first support plate and the second support plate are respectively provided with weight reduction holes.

[0018] The present invention also provides a crane, the crane comprising:

[0019] Slewing mechanism;

[0020] The turntable includes a front section of the turntable mounted on the rotary mechanism and a rear section of the turntable connected to the end of the front section of the turntable. The top of the end of the rear section of the turntable is provided with a first variable amplitude hinge seat and a second variable amplitude hinge seat arranged sequentially from front to back.

[0021] In the aforementioned luffing mechanism for a crane, the transition bracket is hinged to the first luffing hinge seat and the second luffing hinge seat respectively via the first turntable hinge seat and the second turntable hinge seat to be installed on the rear section of the turntable.

[0022] Optionally, the rear section of the turntable is detachably connected to the end of the front section of the turntable, and the crane further includes a power system mounted on the rear section of the turntable.

[0023] Through the above technical solution, the luffing mechanism of the present invention includes a transition bracket, which is a box-shaped structure composed of a first support plate, a second support plate, and two connecting side plates. It has good support stability. During the transportation of the luffing mechanism, the luffing frame can be folded on top of the transition bracket. The entire luffing mechanism is supported by the support legs and the turntable hinge seat at the bottom of the transition bracket or the lower edge of the bottom of the transition bracket. In this way, the stability of the luffing mechanism during transportation can be significantly improved, avoiding the situation of tipping over and being damaged. When it needs to be installed on the turntable, the transition bracket is hinged to the turntable through the first turntable hinge seat and the second turntable hinge seat respectively to be installed on the turntable. In this way, the installation of the luffing mechanism on the turntable is completed. The pulling plate and the hoisting mechanism can achieve their corresponding functions without disassembling and installing on the turntable, which greatly simplifies the installation process and effectively improves installation efficiency and reduces workload.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed embodiments to explain the invention, but do not constitute a limitation thereof.

[0026] In the attached diagram:

[0027] Figure 1 This is a schematic diagram of the amplitude-changing mechanism in a specific embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the transition support structure in the diagram;

[0029] Figure 3 for Figure 1 A schematic diagram of the luffing frame structure;

[0030] Figure 4 This is a schematic diagram of the luffing mechanism mounted on the turntable in a specific embodiment of the present invention;

[0031] Figure 5 for Figure 4 Top view.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100 Transition Bracket

[0034] 101 First support plate 102 Second support plate

[0035] 103 Connecting side plate 104 Luffing frame hinge seat

[0036] 105 First turntable hinge seat; 106 Pull plate hinge seat

[0037] 107 Second Turntable Hinge Seat

[0038] 200 luffing frame

[0039] 300 Supporting Leg

[0040] 400 pull plate

[0041] 500 hoisting mechanism

[0042] 600 Telescopic Drive Component

[0043] 700° slewing mechanism

[0044] 800 turntable front section

[0045] 900 turntable rear section

[0046] 1000 Power System Specific Implementation

[0047] The specific embodiments of the present invention 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 the present invention.

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0049] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used to describe the relative positions of components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions.

[0050] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] The present invention first provides a luffing mechanism for a crane.

[0052] In one embodiment, reference is made to the appendix. Figure 1 To be continued Figure 3 As shown, the amplitude-changing mechanism includes:

[0053] The transition support 100 includes a first support plate 101, a second support plate 102, and two connecting side plates 103. The first support plate 101 and the second support plate 102 are spaced apart and opposite to each other along a first horizontal direction. The two connecting side plates 103 are respectively connected between the first support plate 101 and the second support plate 102, and are spaced apart and opposite to each other along a second horizontal direction perpendicular to the first horizontal direction. The top and bottom of the first support plate 101 are respectively provided with a luffing frame hinge seat 104 and a first turntable hinge seat 105. The top and bottom of the second support plate 102 are respectively provided with a pull plate hinge seat 106 and a second turntable hinge seat 107.

[0054] The luffing frame 200 has its fixed end hinged to the luffing frame hinge seat 104.

[0055] The support leg 300 is connected to the movable end of the luffing frame 200 and is vertically positioned at the bottom of the movable end of the luffing frame 200 when the luffing frame 200 is folded above the transition support 100.

[0056] The pull plate 400 is hinged at one end to the movable end of the luffing frame 200, and at the other end to the hinge seat 106 of the pull plate 400.

[0057] The hoisting mechanism 500 is installed on the transition bracket 100.

[0058] In this embodiment, the luffing mechanism includes a transition bracket 100. The transition bracket 100 is a box-shaped structure composed of a first support plate 101, a second support plate 102, and two connecting side plates 103, which has good support stability. During the transportation of the luffing mechanism, the luffing frame 200 can be folded on top of the transition bracket 100. The entire luffing mechanism is supported by the support legs 300 and the turntable hinge seat at the bottom of the transition bracket 100 or the lower edge of the bottom of the transition bracket 100. This significantly improves the stability of the luffing mechanism during transportation and avoids tipping damage. When it needs to be installed on the turntable, the transition bracket 100 is hinged to the turntable through the first turntable hinge seat 105 and the second turntable hinge seat 107 respectively to install it on the turntable. In this way, the installation of the luffing mechanism on the turntable is completed. The pull plate 400 and the hoisting mechanism 500 can achieve their respective functions without disassembling and installing on the turntable, which greatly simplifies the installation process and effectively improves installation efficiency and reduces workload.

[0059] Specifically, the two connecting side plates 103 can be connected to the first support plate 101 and the second support plate 102 by welding, so that the transition bracket 100 has good structural strength. In addition, reinforcing ribs can be connected between the connecting side plates 103 and the first support plate 101 and between the connecting side plates 103 and the second support plate 102, thereby further improving the structural strength of the transition bracket 100.

[0060] Specifically, the luffing frame hinge 104 and the first turntable hinge 105 can also be connected to the first support plate 101 by welding, and the pull plate hinge 106 and the second turntable hinge 107 can also be connected to the second support plate 102 by welding. This can improve the connection strength between the transition support 100 and the luffing frame 200, the pull plate 400, and the turntable. In addition, the luffing frame hinge 104 and the first turntable hinge 105, as well as the pull plate hinge 106 and the second turntable hinge 107, can be connected by connecting plates or formed into an integral component. This can further improve the connection strength between the transition support 100 and the luffing frame 200, the pull plate 400, and the turntable.

[0061] In practical applications, the specific arrangement and quantity of the luffing frame hinge seats 104 can be designed according to the specific structural form of the luffing frame 200. For example, the luffing frame 200 may include two parallel longitudinal beams and a crossbeam connecting the two longitudinal beams. The first ends of the two longitudinal beams constitute the fixed ends of the luffing frame 200, and the second ends of the two longitudinal beams constitute the movable ends of the luffing frame 200. Correspondingly, the transition support 100 may include two luffing frame hinge seats 104. The two luffing frame hinge seats 104 are arranged at intervals along the second horizontal direction on the top of the first support plate 101. The first ends of the two longitudinal beams of the luffing frame 200 are respectively hinged to the two luffing frame hinge seats 104.

[0062] Similarly, the specific arrangement and quantity of the pull plate hinge seats 106 can be designed according to the specific structural form of the pull plate 400. For example, the luffing mechanism includes two sets of pull plates 400 arranged in parallel. Correspondingly, the transition support 100 may include two pull plate hinge seats 106. The two pull plate hinge seats 106 are arranged at intervals along the second horizontal direction on the top of the second support plate 102. One end of the two sets of pull plates 400 is hinged to the movable end of the luffing frame 200, and the other end is hinged to the two pull plate hinge seats 106 respectively.

[0063] To ensure the stability of the transition bracket 100 during transportation, the transition bracket 100 may include two first turntable hinge seats 105 and two second turntable hinge seats 107. The two first turntable hinge seats 105 are respectively arranged at both ends of the bottom of the first support plate 101 in the second horizontal direction, and the two second turntable hinge seats 107 are respectively arranged at both ends of the bottom of the second support plate 102 in the second horizontal direction. In this way, when the transition bracket 100 is transported, the two first turntable hinge seats 105 and the two second turntable hinge seats 107 can serve as support points for the transition bracket 100. Alternatively, the bottom lower edge of the first support plate 101 can be set lower than the first turntable hinge seats 105, and the bottom lower edge of the second support plate 102 can be set lower than the second turntable hinge seats 107. In this way, when the transition bracket 100 is transported, the bottom lower edges of the first support plate 101 and the bottom lower edges of the second support plate 102 can serve as support points for the transition bracket 100, which can also ensure the stability of the transition bracket 100 during transportation.

[0064] In one embodiment, reference is made to the appendix. Figure 1 As shown, when the luffing frame 200 is folded above the transition support 100, the support surface formed by the bottom of the support leg 300, the bottom lower edge of the first support plate 101, and the bottom lower edge of the second support plate 102 is lower than the lowest point of the drooping pull plate 400. Alternatively, the support surface formed by the bottom of the support leg 300, the first turntable hinge seat 105, and the second turntable hinge seat 107 is lower than the lowest point of the drooping pull plate 400.

[0065] Understandably, the pull plate 400 is a chain structure composed of multiple pull plate units hinged together in sequence. During transportation, it will be in a drooping state. In this embodiment, the support surface formed by the transition bracket 100 is lower than the lowest point of the drooping pull plate 400. With this setting, the drooping pull plate 400 will not wear against the transport vehicle's carrying platform during transportation. Compared with the prior art, which requires positioning components such as positioning pins to close and lock the pull plate 400 onto the luffing frame 200, the pull plate 400 does not need to be disassembled or connected to positioning components during installation or transportation, effectively improving the convenience of switching the pull plate 400 between installation and transportation states.

[0066] In one embodiment, reference is made to the appendix. Figure 2 and attached Figure 5 As shown, the first support plate 101 has a trapezoidal structure that is narrower at the top and wider at the bottom.

[0067] Understandably, trapezoidal structures have good stability. By setting the first support plate 101 as a trapezoidal structure that is narrower at the top and wider at the bottom, the stability of the luffing mechanism during transportation can be effectively improved.

[0068] In one embodiment, reference is made to the appendix. Figure 2 As shown, the top of the first support plate 101 is provided with a luffing frame hinge seat 104 at both ends of the second horizontal direction, and the bottom of the first support plate 101 is provided with a first turntable hinge seat 105 at both ends of the second horizontal direction.

[0069] With this configuration, on the one hand, the first support plate 101 has a trapezoidal structure, which has good structural strength and can ensure the lifting performance of the luffing frame 200. On the other hand, the first support plate 101 has a structure that is narrow at the top and wide at the bottom. The fixed end of the luffing frame 200 is hinged to two luffing frame hinge seats 104 respectively located at both ends of the top of the first support plate 101 in the second horizontal direction. In this way, the overall width of the luffing frame 200 can be designed to be narrower. This allows the luffing frame 200 to reduce its width while ensuring its lifting performance, thereby achieving the purpose of weight reduction. It also makes the center of gravity of the luffing mechanism lower and its stability better.

[0070] In one embodiment, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, the winch mechanism 500 is mounted on and between two connecting side plates 103. This arrangement allows the winch mechanism 500 to be installed using the two connecting side plates 103 as mounting brackets, effectively simplifying the structure. Furthermore, placing the winch mechanism 500 between the two connecting side plates 103 protects it even when it is housed within the transition bracket 100, while also ensuring the compactness of the luffing mechanism structure.

[0071] In one embodiment, reference is made to the appendix. Figure 1 As shown, a telescopic drive hinge seat is fixedly connected to the connecting side plate 103. The luffing mechanism also includes a telescopic drive 600, one end of which is hinged to the telescopic drive hinge seat, and the other end is hinged to the luffing frame 200.

[0072] Understandably, some luffing mechanisms may include telescopic drive components 600 such as hydraulic cylinders. In this embodiment, the telescopic drive component 600 is also integrated onto the transition bracket 100, which can be transported synchronously with the luffing mechanism. Furthermore, during the installation of the luffing mechanism onto the turntable, the telescopic drive component 600 can perform its corresponding functions without needing to be disassembled and reinstalled on the turntable, which greatly simplifies the installation process and effectively improves installation efficiency and reduces workload.

[0073] Specifically, each of the two connecting side plates 103 has a telescopic drive hinge seat on its opposite side. The luffing mechanism may include two telescopic drives 600. One end of each of the two telescopic drives 600 is hinged to the telescopic drive hinge seat, and the other end is hinged to both sides of the luffing frame 200 in the width direction.

[0074] In one embodiment, reference is made to the appendix. Figure 1 As shown, the first support plate 101 gradually tilts from bottom to top in a direction close to the second support plate 102, while the second support plate 102 gradually tilts from bottom to top in a direction away from the first support plate 101. With this configuration, when the transition bracket 100 is installed on the turntable, it will tilt and extend beyond the rear of the turntable. This ensures that even with a relatively short luffing frame 200, it has sufficient length to extend beyond the rear of the turntable. This allows the luffing frame 200 to maintain its lifting performance while reducing its length, achieving weight reduction. It also lowers the center of gravity of the luffing mechanism and improves its stability.

[0075] In one embodiment, reference is made to the appendix. Figure 2 As shown, the first support plate 101 and the second support plate 102 are respectively provided with weight reduction holes. This arrangement can effectively reduce the overall weight of the luffing mechanism, making it easier to handle and improving the convenience of transportation.

[0076] The present invention also provides a crane.

[0077] In one embodiment, reference is made to the appendix. Figure 4 and attached Figure 5 As shown, the crane includes:

[0078] Slewing mechanism 700;

[0079] The turntable includes a front section 800 mounted on a rotary mechanism 700 and a rear section 900 connected to the end of the front section 800. The top of the end of the rear section 900 is provided with a first variable amplitude hinge seat and a second variable amplitude hinge seat arranged sequentially from front to back.

[0080] The aforementioned luffing mechanism for a crane has a transition bracket 100 that is hinged to the first luffing hinge seat and the second luffing hinge seat via the first turntable hinge seat 105 and the second turntable hinge seat 107, respectively, to be installed at the rear section 900 of the turntable.

[0081] Clearly, cranes that employ the aforementioned luffing mechanism also possess the beneficial effects of that luffing mechanism.

[0082] In one embodiment, reference is made to the appendix. Figure 4 and attached Figure 5 As shown, the rear section 900 of the turntable is detachably connected to the end of the front section 800 of the turntable. The crane also includes a power system 1000, which is mounted on the rear section 900 of the turntable. With this configuration, the rear section 900 of the turntable and the power system 1000 can be transported as a single transport unit during actual transportation.

[0083] In the description of this invention, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0084] In this invention, unless otherwise explicitly 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 them; 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] 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 the present invention. 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.

[0086] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A luffing mechanism for a crane, characterized in that, The amplitude-changing mechanism includes: The transition support (100) includes a first support plate (101), a second support plate (102), and two connecting side plates (103). The first support plate (101) and the second support plate (102) are spaced apart and arranged opposite to each other along a first horizontal direction. The two connecting side plates (103) are respectively connected between the first support plate (101) and the second support plate (102), and are spaced apart and arranged opposite to each other along a second horizontal direction perpendicular to the first horizontal direction. The top and bottom of the first support plate (101) are respectively provided with a luffing frame hinge seat (104) and a first turntable hinge seat (105). The top and bottom of the second support plate (102) are respectively provided with a pull plate hinge seat (106) and a second turntable hinge seat (107). The luffing frame (200) has its fixed end hinged to the luffing frame hinge seat (104); A support leg (300) is connected to the movable end of the luffing frame (200) and is vertically positioned at the bottom of the movable end of the luffing frame (200) when the luffing frame (200) is folded above the transition support (100); The pull plate (400) is hinged at one end to the movable end of the luffing frame (200) and at the other end to the hinge seat (106) of the pull plate (400); The hoisting mechanism (500) is mounted on the transition support (100).

2. The luffing mechanism for a crane according to claim 1, characterized in that, When the luffing frame (200) is folded above the transition support (100), the support surface formed by the bottom of the support leg (300), the bottom lower edge of the first support plate (101), and the bottom lower edge of the second support plate (102) is lower than the lowest point of the drooping pull plate (400), or the support surface formed by the bottom of the support leg (300), the first turntable hinge seat (105), and the second turntable hinge seat (107) is lower than the lowest point of the drooping pull plate (400).

3. The luffing mechanism for a crane according to claim 1, characterized in that, The first support plate (101) is a trapezoidal structure that is narrower at the top and wider at the bottom.

4. The luffing mechanism for a crane according to claim 3, characterized in that, The top of the first support plate (101) is provided with a luffing frame hinge seat (104) at both ends of the second horizontal direction, and the bottom of the first support plate (101) is provided with a first turntable hinge seat (105) at both ends of the second horizontal direction.

5. The luffing mechanism for a crane according to claim 1, characterized in that, The hoisting mechanism (500) is mounted on the two connecting side plates (103) and located between the two connecting side plates (103).

6. The luffing mechanism for a crane according to claim 1, characterized in that, A telescopic drive hinge seat is fixedly connected to the connecting side plate (103). The luffing mechanism also includes a telescopic drive (600). One end of the telescopic drive (600) is hinged to the telescopic drive hinge seat, and the other end is hinged to the luffing frame (200).

7. The luffing mechanism for a crane according to claim 1, characterized in that, The first support plate (101) gradually tilts from bottom to top in a direction close to the second support plate (102), and the second support plate (102) gradually tilts from bottom to top in a direction away from the first support plate (101).

8. The luffing mechanism for a crane according to claim 1, characterized in that, The first support plate (101) and the second support plate (102) are respectively provided with weight reduction holes.

9. A crane, characterized in that, The crane includes: Rotary mechanism (700); The turntable includes a front section (800) mounted on the rotary mechanism (700) and a rear section (900) connected to the end of the front section (800). The top of the end of the rear section (900) is provided with a first variable amplitude hinge seat and a second variable amplitude hinge seat arranged sequentially from front to back. According to any one of claims 1 to 8, the luffing mechanism for a crane, the transition bracket (100) is hinged to the first luffing hinge seat and the second luffing hinge seat via the first turntable hinge seat (105) and the second turntable hinge seat (107) respectively to be mounted on the rear section (900) of the turntable.

10. The crane according to claim 9, characterized in that, The rear section (900) of the turntable is detachably connected to the end of the front section (800) of the turntable, and the crane also includes a power system (1000) mounted on the rear section (900).

Images