Telescopic device for boom of tower crane

Abstract

The utility model provides a tower crane boom telescopic device, which relates to the technical field of engineering machinery and comprises a tower body, a telescopic component fixedly connected to the outer side of the tower body, a retractable component fixedly connected to the top end of the tower body, the telescopic component comprises a first driving motor, and the outer side of the first driving motor is mounted on the tower body. A first connecting frame is fixedly connected to the driving end of the first driving motor, a first extending frame is fixedly connected to the driving end of the first driving motor, a rotating bent block is rotationally connected to one end of the first extending frame, and a second extending frame is rotationally connected to the end, away from the first extending frame, of the rotating bent block; by means of the design, the tower crane can conduct unfolding and folding operation on the arm support in a complex construction site with limited space, the adaptability of equipment is improved, the tower crane can be installed in a limited construction environment, and the problem that the arm support cannot be unfolded in a narrow construction site due to the fact that the arm support is too long is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a tower crane boom telescopic device. Background Art

[0002] The tower crane jib, commonly known as the tower crane boom, is the part of a tower crane that is primarily used for hoisting, lifting, and moving heavy objects. Tower cranes are essential equipment for construction sites and large-scale engineering projects, especially in high-rise buildings and large-scale construction sites, where they can provide enormous lifting capacity and height.

[0003] A search of Chinese patent publication number CN220787871U discloses a tower crane. The tower crane comprises a tower body, a boom assembly, and a luffing mechanism. A tower head is mounted at the top of the tower body. The boom assembly includes a counterarm and a boom mounted horizontally at either end of the tower head, pivotally connected to the ends of the boom and tower head. The luffing mechanism includes a luffing rope and a drive assembly mounted on the counterarm. The first end of the luffing rope is connected to the drive assembly, and the second end is connected to the boom and tower head, respectively. The drive assembly drives the luffing rope to retract and extend, thereby driving the boom to pitch and swing.

[0004] In order to solve the problem of the complicated installation process of tower cranes, the above patent eliminates the A-frame structure of tower cranes in the prior art and adopts the method of installing a tower head instead of the A-frame, thereby optimizing the boom structure of the tower crane and facilitating installation.

[0005] However, in actual use, as the boom length of a tower crane increases, the size of the boom itself also increases. In some narrow construction sites, the long boom may require a larger range of space to unfold, resulting in the tower crane with a long boom being unable to be smoothly installed in the limited space. Therefore, the utility model provides a tower crane boom extension and retraction device. Utility Model Content

[0006] The purpose of the utility model is to solve the shortcomings of the prior art and provide a tower crane boom telescopic device.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a tower crane boom telescopic device, comprising a tower body, the outer side of the tower body is fixedly connected to a telescopic component, and the top of the tower body is fixedly connected to a retractable component;

[0008] The telescopic assembly includes a driving motor 1, the outer side of the driving motor 1 is installed on the tower body, the driving end of the driving motor 1 is fixedly connected to the connecting frame 1, the driving end of the driving motor 1 is fixedly connected to the extending frame 1, one end of the extending frame 1 is rotatably connected to the rotating bent block, the end of the rotating bent block away from the extending frame 1 is rotatably connected to the extending frame 2, the end of the extending frame 2 away from the rotating bent block is rotatably connected to the connecting frame 2, one end of the connecting frame 1 is fixedly connected to the rotating gear 1, and one end of the connecting frame 2 is fixedly connected to the rotating gear 2.

[0009] As a preferred embodiment, the retracting and extending assembly includes a second drive motor, the outer side of the second drive motor is installed on the tower body, the driving end of the second drive motor is fixedly connected to a winch drum, a steel wire rope is sleeved on the winch drum, and the outer side of the tower body is rotatably connected to a guide wheel.

[0010] The technical effect of adopting the above technical solution is that it can effectively control the retraction and extension of the crane arm, thereby reducing the complexity and time consumption of manual operation.

[0011] As a preferred embodiment, the bottom end of the connecting frame 1 is fixedly connected to the bending boom 1, and the bottom end of the connecting frame 2 is fixedly connected to the bending boom 2.

[0012] The technical effect of adopting the above technical solution is to ensure that the crane arm can move when it is retracted.

[0013] As a preferred embodiment, the rotating gear 1 and the rotating gear 2 are meshingly connected.

[0014] The technical effect of adopting the above technical solution is: providing a stable rotation point to prevent offset.

[0015] As a preferred embodiment, the end of the rotating bending block away from the extending frame 1 is rotatably connected to the connecting frame 1 and the connecting frame 2.

[0016] The technical effect of adopting the above technical solution is: ensuring power transmission at the bend, coordinating the rotating gear 1 and the rotating gear 2 to complete the rotation, and reducing stress concentration.

[0017] As a preferred embodiment, one end of the steel wire rope is fixedly connected to the rotating bend block, and the other end of the steel wire rope is fixedly connected to the second extension frame.

[0018] The technical effect of adopting the above technical solution is that the tension of the wire rope can be transmitted to the bending boom 1 and the bending boom 2.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are that, by setting drive motor 1 and drive motor 2 to start at the same time, drive motor 1 is responsible for the extension and retraction of the boom, and drive motor 2 controls the retraction and extension of the boom. When drive motor 1 is working, the balance and stability of the boom are ensured by rotating the extension frame, so that the rotating gear is tightly engaged, driving the connecting frame to rotate according to a predetermined path. After drive motor 2 is started, the winch drum rotates, and the wire rope reduces the tension on the bent boom 1, causing it to descend, and at the same time pulls the bent boom 2 up to achieve the folding of the two arms. The guide wheel accurately guides and accurately controls the extension and retraction state of the boom. This design enables the tower crane to perform boom deployment and retraction operations in construction sites with limited and complex space, improves the adaptability of the equipment, enables it to be installed in a limited construction environment, and effectively solves the problem that the boom is too long and cannot be deployed in a narrow construction site. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of a tower crane boom extension device provided by the utility model;

[0021] Figure 2 A deformation diagram of a tower crane boom extension device provided by the utility model;

[0022] Figure 3 A schematic diagram of the telescopic assembly structure of a tower crane boom telescopic device provided by the utility model;

[0023] Figure 4 for Figure 3 A in the enlarged view.

[0024] Legend:

[0025] 1. Tower body;

[0026] 2. Telescopic assembly; 21. Driving motor 1; 22. Connecting frame 1; 23. Connecting frame 2; 24. Extension frame 1; 25. Rotating bend block; 26. Extension frame 2; 27. Rotating gear 1; 28. Rotating gear 2;

[0027] 3. Retractable assembly; 31. Second drive motor; 32. Hoist drum; 33. Wire rope; 34. Guide wheel;

[0028] 4. Bend the first boom; 5. Bend the second boom. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] like Figure 1 - Figure 4 As shown, this embodiment provides a technical solution: a tower crane boom telescopic device, comprising a tower body 1, a telescopic assembly 2 fixedly connected to the outer side of the tower body 1, and a retractable assembly 3 fixedly connected to the top of the tower body 1;

[0031] The telescopic assembly 2 includes a driving motor 21, the outer side of the driving motor 21 is installed on the tower body 1, the driving end of the driving motor 21 is fixedly connected to the connecting frame 22, the driving end of the driving motor 21 is fixedly connected to the extension frame 24, one end of the extension frame 24 is rotatably connected to the rotating bent block 25, the end of the rotating bent block 25 away from the extension frame 24 is rotatably connected to the connecting frame 22 and the connecting frame 2 23, the end of the rotating bent block 25 away from the extension frame 24 is rotatably connected to the extension frame 2 26, the end of the extension frame 26 away from the rotating bent block 25 is rotatably connected to the connecting frame 23, one end of the connecting frame 22 is fixedly connected to the rotating gear 1 27, one end of the connecting frame 23 is fixedly connected to the rotating gear 2 28, the rotating gear 1 27 and the rotating gear 2 28 are meshedly connected, the bottom end of the connecting frame 22 is fixedly connected to the bending boom 1 4, and the bottom end of the connecting frame 2 23 is fixedly connected to the bending boom 2 5;

[0032] The tower body 1 is the main supporting structure of the entire tower crane, and a telescopic component 2 is fixedly installed on its outer side. The design of the telescopic component 2 allows the boom of the tower crane to be telescopic when needed, so that the length of the boom can be flexibly adjusted in a narrow construction site. The driving motor 1 21 provides power to drive the telescopic movement of the boom. The connecting frame 1 22 is fixedly connected to the driving end of the driving motor 1 21. It is responsible for transmitting the power of the driving motor 1 21 to the extension frame 1 24. The extension frame 1 24 is a part of the telescopic arm. By receiving the power of the driving motor 1 21, the telescopic movement of the boom is realized, ensuring that the lifting arm can be flexibly converted between different lengths. The rotating bend 25 is connected to one end of the extension frame 1 24, so that the extension frame 1 24 and the extension frame 2 26 can realize The bending block 25 is connected to the connecting frame 1 22 and the connecting frame 2 23 to form a stable rotating structure. This design ensures that the boom can maintain good balance and stability during the extension and retraction process. The extension frame 26 is connected together through the connecting frame 23 so that the bending effect can be achieved by rotating the bending block 25 when the drive motor 1 21 is driven. The rotating gear 28 is meshed with the rotating gear 1 27 to form a meshing transmission mechanism to ensure the synchronous operation between the two gears to achieve coordinated telescopic movement of the boom and reduce the risk of failure. The bending boom 1 4 is connected to the bending boom 2 5 through the telescopic assembly 2, which can adjust the angle while achieving load-bearing, thereby adapting to different operational requirements.

[0033] Furthermore, if Figure 1 - Figure 3 As shown, the retractable assembly 3 includes a second drive motor 31. The outer side of the second drive motor 31 is installed on the tower body 1. The driving end of the second drive motor 31 is fixedly connected to a winch drum 32. A steel wire rope 33 is sleeved on the winch drum 32. One end of the steel wire rope 33 is fixedly connected to the rotating bend block 25. The other end of the steel wire rope 33 is fixedly connected to the second extension frame 26. The outer side of the tower body 1 is rotatably connected to a guide wheel 34.

[0034] The second drive motor 31 is responsible for the retraction and extension of the boom as a power source, ensuring that the boom can be completed when it is telescopically extended. The hoist drum 32 is fixed to the driving end of the second drive motor 31. When the second drive motor 31 is started, the hoist drum 32 rotates accordingly, thereby driving the retraction and extension movement of the wire rope 33. The wire rope 33 is sleeved on the hoist drum 32. By winding and releasing on the hoist drum 32, the telescopic state of the boom is controlled. One end of the wire rope 33 is fixedly connected to the rotating bend 25. Through this connection, the retraction and extension assembly 3 can directly act on the rotating part of the telescopic assembly 2. When the retraction and extension operation is in progress, it drives the rotation and extension of the boom, thereby adjusting the working length and angle of the boom. The other end of the wire rope 33 is fixedly connected to the extension frame 26. This design ensures that the two parts of the boom can move in a coordinated manner during the retraction and extension process. By pulling and relaxing the wire rope 33, the extension frame 26 can be smoothly telescoped to achieve precise position control. The existence of the guide wheel 34 provides a fixed path and rotation direction for the wire rope 33, ensuring that the wire rope 33 will slide along the guide wheel 34 during the bending process.

[0035] Working principle:

[0036] like Figure 1 - Figure 4 As shown:

[0037] When in use: the drive motor 1 21 and the drive motor 2 31 are started at the same time. The main function of the drive motor 1 21 is to be responsible for the telescopic movement of the boom, while the drive motor 2 31 mainly controls the retraction and extension operation of the boom. When the drive motor 1 21 starts working, the extension frame 1 24 and the extension frame 2 26 rotate on the rotating bent block 25. The rotating bent block 25 ensures that the boom can maintain balance and stability during the telescopic movement during the rotation process, thereby enabling the rotating gear 1 27 and the rotating gear 2 28 to be tightly meshed and transmitted. This meshing transmission The method can effectively drive the connecting frame 1 22 and the connecting frame 2 23 to rotate on the specified working path. In addition, the start of the driving motor 2 31 drives the winch drum 32 to rotate. At this time, the wire rope 33, driven by the winch drum 32, reduces the pulling force on the bending boom 1 4, so that the bending boom 1 4 moves downward, and then pulls the bending boom 2 5 to move upward. In this way, the folding of the bending boom 1 4 and the bending boom 2 5 can be achieved, and the precise guidance of the guide wheel 34 further realizes the precise control of the telescopic state of the boom.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A tower crane boom telescopic device, comprising a tower body (1), characterized in that: The outer side of the tower body (1) is fixedly connected with a telescopic assembly (2), and the top of the tower body (1) is fixedly connected with a retractable assembly (3); the telescopic assembly (2) comprises a driving motor (21), the outer side of the driving motor (21) is mounted on the tower body (1), the driving end of the driving motor (21) is fixedly connected with a connecting frame (22), the driving end of the driving motor (21) is fixedly connected with an extension frame (24), one end of the extension frame (24) is rotatably connected with a rotating bend (25), the end of the rotating bend (25) away from the extension frame (24) is rotatably connected with an extension frame (26), the end of the extension frame (26) away from the rotating bend (25) is rotatably connected with a connecting frame (23), one end of the connecting frame (22) is fixedly connected with a rotating gear (27), and one end of the connecting frame (23) is fixedly connected with a rotating gear (28).

2. The tower crane boom extension device according to claim 1, characterized in that: The retractable assembly (3) comprises a second drive motor (31), the outer side of the second drive motor (31) is mounted on the tower body (1), the driving end of the second drive motor (31) is fixedly connected to a hoist drum (32), a steel wire rope (33) is sleeved on the hoist drum (32), and the outer side of the tower body (1) is rotatably connected to a guide wheel (34).

3. The tower crane boom extension device according to claim 1, characterized in that: The bottom end of the connecting frame 1 (22) is fixedly connected to the bending boom 1 (4), and the bottom end of the connecting frame 2 (23) is fixedly connected to the bending boom 2 (5).

4. The tower crane boom extension device according to claim 1, characterized in that: The rotating gear 1 (27) and the rotating gear 2 (28) are meshingly connected.

5. The tower crane boom extension device according to claim 1, characterized in that: One end of the rotating bending block (25) away from the extending frame 1 (24) is rotatably connected to the connecting frame 1 (22) and the connecting frame 2 (23).

6. The tower crane boom extension device according to claim 2, characterized in that: One end of the steel wire rope (33) is fixedly connected to the rotating bend block (25), and the other end of the steel wire rope (33) is fixedly connected to the second extension frame (26).

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