Tower crane boom capable of adjusting lateral windward area and tower crane thereof

Abstract

The tower crane boom capable of adjusting the lateral windward area comprises a track arranged on the tower crane boom, winding drum mechanisms are arranged at the two ends of the track, the winding drum mechanisms are connected with a plurality of wind shields arranged on the track through steel wire ropes, and a positioning device used for determining the positions of the wind shields is arranged on the track. According to the tower crane boom capable of adjusting the lateral windward area and the tower crane thereof, the windward area of the boom is changed under different working conditions and the influence of wind load on the stress of the tower crane in the horizontal direction is reduced by arranging the position-adjustable baffle wind plate on the boom, so that the windward area of the boom of the tower crane is adjustable; and various working condition requirements can be flexibly met.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, in particular to a tower crane boom with adjustable lateral windward area and a tower crane thereof. Background Art

[0002] When a tower crane is working under normal conditions of lifting heavy objects, the forces on the tower crane mainly come from its own weight, the load and the wind bending moment. When it stops working and does not lift heavy objects in strong winds, the forces on the tower crane mainly come from its own weight and the wind bending moment. The tower crane will stop working in storm conditions and release the slewing lock to allow the upper half of the tower crane to rotate freely in the wind to achieve the minimum wind-resistant area. When a continuous strong wind is about to come, the hook will be retracted to the highest position, the trolley will be retracted to the minimum amplitude of the arm root, the slewing mechanism weather vane brake will be opened, and the boom can rotate freely 360°. There must be no obstacles within the slewing range to ensure that there is enough safety distance between the tower crane and the building, and between the tower groups. In the short-arm-to-long-arm state, the sail should be set according to the relevant requirements of the instruction manual to ensure that the tower crane can rotate with the wind.

[0003] Therefore, tower cranes need to be calculated and checked during design, mainly including four working conditions: 1. Static load and no wind working condition, 2. Dynamic load and wind working condition, 3. Sudden unloading working condition, 4. Anti-storm working condition in non-working state, so that the tower crane can show obvious outstanding performance in both dynamic load and wind working condition and anti-storm working condition.

[0004] Wind bending moment: The calculation formula is wind pressure × windbreak area × distance offset.

[0005] Side wind: wind blows from the left / right side of the boom to the other side of the boom.

[0006] Backblowing: The wind blows from the base of the boom to the end of the boom. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a tower crane boom with adjustable lateral windward area and a tower crane thereof, so that the windward area of the tower crane boom can be adjusted and flexibly adapted to various working conditions.

[0008] The present invention is implemented by the following technical solution: a tower crane boom with adjustable lateral windward area, comprising a track arranged on the tower crane boom, a drum mechanism being provided at both ends of the track, the drum mechanism being connected to a plurality of windshields arranged on the track via steel wire ropes, and a positioning device being provided on the track for determining the position of the windshields.

[0009] It is further provided that: the number of the rails is the same as the number of the wind deflectors.

[0010] A limiting device for preventing the windshield from derailing is provided on the track.

[0011] The limiting device is a T-shaped groove, and the bottom of the windshield is provided with a T-shaped protrusion used in conjunction with the T-shaped groove.

[0012] Two positioning devices are provided on each track, one positioning device is used to control the starting position of the wind shield, and the other positioning device is used to control the target position of the wind shield.

[0013] In the non-working state of anti-storm working conditions, multiple wind shields are evenly distributed on the track and do not overlap with each other. In the working state of dynamic load wind conditions, each wind shield is located at the starting point of the track and overlaps with each other.

[0014] The windshield includes a fixed windshield and a movable windshield. In the non-working anti-storm working condition, the movable windshield is between two adjacent fixed windshields. In the working state under dynamic load wind conditions, the movable windshield overlaps with the fixed windshield.

[0015] The distance between the two adjacent fixed windshields is greater than the width of the movable windshield.

[0016] It also includes a controller, wherein the input end of the controller is connected to the positioning device, the output end of the controller is connected to the reel mechanism, and the positioning device is a limit switch.

[0017] A tower crane comprising a tower crane boom with adjustable lateral windward area according to any one of claims 1 to 9 The present invention has the following advantages: the tower crane boom with adjustable lateral windward area and the tower crane thereof of the present invention can change the windward area of the boom under different working conditions by arranging an adjustable position baffle wind plate on the boom, thereby reducing the influence of wind load on the horizontal force of the tower crane, making the windward area of the tower crane boom adjustable and flexibly adapting to various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, as part of this disclosure, are intended to provide a further understanding of the disclosure. The exemplary embodiments of the disclosure and their descriptions are intended to explain the disclosure and do not constitute undue limitations thereon. Obviously, the drawings described below are merely examples, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0019] In the attached figure: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure under dynamic load and wind conditions in working state; Figure 3 is a structural diagram of another embodiment of the present invention; Figure 4 yes Figure 3 Schematic diagram of the structure under normal working conditions.

[0020] In the figure: 1. windshield, 2. track, 3. wire rope, 4. drum mechanism, 5. fixed windshield, 6. movable windshield.

[0021] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0025] like Figures 1 to 4The tower crane boom with adjustable lateral frontal area shown in the figure includes a track 2 mounted on the boom. A drum mechanism 4 is provided at each end of the track 2. The drum mechanism 4 is connected to a plurality of windshields 1 mounted on the track 2 via steel cables. A positioning device is provided on the track 2 for determining the position of the windshields 1. The number of tracks 2 is the same as the number of windshields 1. The tower crane boom with adjustable lateral windward area of the present invention comprises a windshield, a track, a wire rope and a drum mechanism. The track is arranged on the side of the boom and operates through the drum mechanism. The wire rope pulls the windshield to move laterally on the track. When in use, in a non-working state under storm-resistant conditions, the windshields are spread out on the track and do not overlap with each other. After the upper half of the tower crane faces the wind, it freely rotates to the rear-blowing direction. Since the bending moment of the counterweight on the tower body in the rear-blowing posture is opposite to the direction of the wind bending moment, part of the wind bending moment can be offset to achieve the optimal state; in a working state under dynamic load with wind conditions, the windshields overlap or partially overlap with each other, providing minimum wind resistance and reducing the bending moment caused by the side-blowing wind on the tower crane.

[0026] like Figures 1 to 4 The tower crane boom shown has an adjustable lateral windward area, and the track 2 is provided with a limiting device for preventing the windshield 1 from derailing. The limiting device is a T-shaped groove, and the bottom of the windshield 1 is provided with a T-shaped protrusion used in conjunction with the T-shaped groove. The track of the present invention is provided with a limiting device to prevent the windshield from derailing. Specifically, the limiting device is a T-shaped groove and a T-shaped protrusion used in conjunction with each other. This structure can play a guiding role when the windshield moves, and can also play a limiting role to prevent the windshield from derailing under storm conditions, thereby ensuring the smooth operation of the windshield.

[0027] like Figures 1 to 4 In the tower crane boom with adjustable lateral frontal area shown, each track 2 is equipped with two positioning devices: one for controlling the starting position of windshield 1, and the other for controlling the target position of windshield 1. In the tower crane boom with adjustable lateral frontal area of the present invention, each windshield has two corresponding positioning devices for determining the initial and final positions of the windshield, facilitating control of the windshield's position under different operating conditions.

[0028] like Figures 1 to 2 The tower crane boom shown has an adjustable lateral windward area. In the non-working anti-storm working condition, multiple wind shields 1 are evenly distributed on the track 2 and do not overlap with each other. In the working state under dynamic load and wind conditions, each wind shield is located at the starting point of the track 2 and overlaps with each other.

[0029] like Figures 3 and 4The tower crane boom with adjustable lateral windward area shown in the figure comprises a windshield 1 including a fixed windshield 5 and a movable windshield 6. In a non-working state for anti-storm conditions, the movable windshield 6 is between two adjacent fixed windshields 5. In a working state for dynamic load and wind conditions, the movable windshield 6 overlaps with the fixed windshield 5. The distance between the two adjacent fixed windshields 5 is greater than the width of the movable windshield 6. The tower crane boom with adjustable lateral windward area of the present invention can also adopt the form of combining fixed windshields and movable windshields according to actual needs. The fixed windshields are arranged at a certain distance, and the gaps between the fixed windshields can be filled by the movable windshield on the rear side of each fixed windshield when necessary. When a smaller windshield area is required under normal working conditions, the mobile windshield is located behind the fixed windshield, and the overall windshield area of the boom is smaller; when a larger windshield area is required under storm-resistant conditions, the drum mechanism works and the wire rope pulls the mobile windshield, causing the mobile windshield to move out from the rear of the fixed windshield along the track. All windshields are fully unfolded, and the overall windshield area of the boom is larger.

[0030] like Figures 1 to 4 The tower crane boom with adjustable lateral windward area shown in FIG. further includes a controller, the controller input of which is connected to a positioning device, and the controller output of which is connected to a reel mechanism 4. The positioning device is a limit switch. The present invention also includes a controller that controls the movement of the reel mechanism, which in turn controls the movement of the windshield, by human input of signals to the controller. A positioning device on the track detects whether the windshield has reached its designated position and transmits a signal to the controller, which determines whether to stop the reel mechanism, thereby manually controlling the movement of the windshield and changing the boom's windshield area.

[0031] A tower crane includes the aforementioned tower crane boom with adjustable lateral windward area. A tower crane equipped with the tower crane boom with adjustable lateral windward area is expected to significantly improve its overall performance under both dynamic load wind conditions and storm wind resistance conditions.

[0032] The tower crane boom with adjustable lateral windward area and the tower crane thereof of the present invention can adjust and control the windward area of the boom by moving the wind shield. The windward area of the boom should have a large difference before and after the adjustment. This difference is sufficient to enable the boom to complete free rotation before the strong wind arrives. That is, when facing continuous strong wind, the wind will inevitably blow from the balance arm to the boom. After the upper half of the tower crane faces the wind, it can freely rotate to the rear-blowing direction. Since the bending moment of the counterweight on the tower body in the rear-blowing posture is opposite to the wind bending moment, part of the wind bending moment can be offset to achieve the optimal state.

[0033] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0034] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0035] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A tower crane boom with adjustable lateral frontal area, characterized in that: The invention comprises a track (2) arranged on a tower crane boom, with drum mechanisms (4) provided at both ends of the track (2), the drum mechanisms (4) being connected to a plurality of windshields (1) arranged on the track (2) via steel wire ropes, and a positioning device for determining the position of the windshields (1) being provided on the track (2).

2. The tower crane boom with adjustable lateral frontal area according to claim 1, characterized in that: The number of the rails (2) is the same as the number of the wind deflectors (1).

3. The tower crane boom with adjustable lateral frontal area according to claim 1, characterized in that: The track (2) is provided with a limiting device for preventing the windshield (1) from derailing.

4. The tower crane boom with adjustable lateral frontal area according to claim 3, characterized in that: The limiting device is a T-shaped groove, and the bottom of the windshield (1) is provided with a T-shaped protrusion used in conjunction with the T-shaped groove.

5. The tower crane boom with adjustable lateral windward area according to claim 1, characterized in that: Two positioning devices are provided on each track (2), one positioning device is used to control the starting position of the windshield (1), and the other positioning device is used to control the target position of the windshield (1).

6. The tower crane boom with adjustable lateral frontal area according to claim 1, characterized in that: In the non-working state under the anti-storm working condition, the plurality of wind shields (1) are evenly distributed on the track (2) and do not overlap with each other. In the working state under the dynamic load wind working condition, each wind shield is located at the starting point of the track (2) and overlaps with each other.

7. The tower crane boom with adjustable lateral frontal area according to claim 1, characterized in that: The windshield (1) comprises a fixed windshield (5) and a movable windshield (6); in a non-working state under a storm-resistant working condition, the movable windshield (6) is between two adjacent fixed windshields (5); in a working state under a dynamic load and wind working condition, the movable windshield (6) overlaps with the fixed windshield (5).

8. The tower crane boom with adjustable lateral frontal area according to claim 5, characterized in that: The distance between the two adjacent fixed windshields (5) is greater than the width of the movable windshield (6).

9. The tower crane boom with adjustable lateral frontal area according to claim 1, characterized in that: It also includes a controller, wherein the input end of the controller is connected to the positioning device, the output end of the controller is connected to the reel mechanism (4), and the positioning device is a limit switch.

10. A tower crane, characterized in that: A tower crane boom with adjustable lateral windward area comprising the boom according to any one of claims 1 to 9.

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