Mast crane

Abstract

The utility model discloses a mast crane which comprises a lifting hook, a main arm, a front base, a lifting winch, a variable amplitude winch, a rear base, a propeller strut rear supporting rod, a propeller strut front supporting rod and a pulling plate, and is characterized in that a slewing bearing is arranged on the front base, a rotary table is arranged on the slewing bearing, an upper vehicle part of the crane is arranged on the rotary table, and a lower vehicle part of the crane is arranged on the main arm. The front supporting rod is detachably connected with a supporting frame and a threaded sleeve which are used for assisting equipment installation. The rotary table, the slewing bearing, the installation auxiliary tool and other components are arranged, the hoisting mechanism is arranged on the side face of the rotary table, the revolvability of the upper vehicle part of the crane is achieved, overwater operation in the dismounting and mounting process is avoided, the overturning moment of the slewing bearing is shared by connection of the rear supporting rod of the propeller strut and the rear base, and the hoisting efficiency is improved. In conclusion, the slewing bearing has the advantages that the structural design is reasonable, the number of parts is small, the assembling and disassembling processes are simple and convenient, and the manufacturing, transferring, installing and using costs are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, and particularly relates to a mast crane. Background Technique

[0002] The mast crane is one of the more common cranes and is commonly used in ports and construction sites. It is usually fixedly installed, that is, the hoisting of objects is achieved through the pitching of the main boom and the lifting and lowering of the hook. During the installation and disassembly process, since the main boom needs to extend into the water, a floating crane ship is often required to assist in the operation, which not only increases the cost but also poses safety hazards. Although there are already some rotary mast cranes that can reduce the need for water operations. For example, a mast crane disclosed in the invention patent with the Chinese patent publication number CN113602981A arranges a large number of counterweights at the hinge point of the rear strut, enabling the heavy object to move in different directions, expanding the working range of the mast crane, and avoiding water-based disassembly and installation operations to a certain extent. However, its high equipment and installation costs limit its wide application. Content of the Utility Model

[0003] Purpose of the utility model: The purpose of the utility model is to provide a rotary mast crane that does not require water-based disassembly and installation, has low equipment and installation costs, and has a simple structure.

[0004] Technical solution: A mast crane provided by the utility model includes a hook, a main boom, a front base, a hoisting winch, a luffing winch, a rear base, a rear strut of the A-frame, a front strut of the A-frame, and a pull plate. It is characterized in that a slewing bearing is arranged on the front base, a turntable is arranged on the slewing bearing, and the upper part of the crane is installed on the turntable. A support frame and a threaded sleeve for assisting in the installation of the equipment are detachably connected to the front strut.

[0005] Further, a winch platform is arranged on the side of the turntable, and the hoisting winch and the luffing winch are installed on the winch platform.

[0006] Further, the main boom and the front strut of the A-frame share a hinge point, and the connecting line of the left and right hinge points passes through the center of the slewing bearing.

[0007] Further, the bottom of the rear strut of the A-frame is hinged to the rear base.

[0008] Further, a slewing mechanism is arranged on one side of the turntable, and the slewing mechanism drives the slewing bearing and the above parts.

[0009] Further, the front base and the rear base are anchored to the foundation through anchor bolts.

[0010] Beneficial effects: Compared with the prior art, the utility model has the following advantages: (1) Avoiding water operations: By setting components such as a turntable, a slewing bearing, and installation auxiliary tools, and arranging the hoisting mechanism on the side of the turntable, the utility model realizes the slewing of the upper part of the crane, avoiding water operations during the disassembly and assembly process, and reducing costs and potential safety hazards; (2) Reducing the burden on the slewing bearing: The connection between the rear strut of the derrick and the rear base of the utility model shares the overturning moment of the slewing bearing, enabling the selection of a slewing bearing with a smaller size and further reducing costs; (3) Simple structure and low cost: The mast crane of the utility model has a reasonable structural design, a small number of components, and a simple disassembly and assembly process, reducing the manufacturing, transportation, installation, and use costs. Brief Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model after assembly;

[0012] Figure 2 It is a schematic diagram of the overall structure of the utility model during assembly preparation;

[0013] Figure 3 It is a schematic diagram of the overall structure of the utility model during the assembly process. Detailed Description of the Preferred Embodiment

[0014] The technical solution of the utility model will be further described below with reference to the accompanying drawings.

[0015] A mast crane of the utility model, as Figures 1-3 shown, includes a hook 1, a main boom 2, a turntable 3, a slewing bearing 4, a front base 5, a hoisting winch 6, a luffing winch 7, a rear base 8, a rear strut of the derrick 9, a front strut of the derrick 10, and a pull plate 11. An installation auxiliary tool support frame 12 and a threaded sleeve 13 are detachably connected to the front strut of the derrick 10. A slewing bearing 4 is arranged on the front base 5, a turntable 3 is arranged on the slewing bearing 4, a slewing mechanism 14 is arranged on one side of the turntable 3, a hoisting platform is arranged on the other side of the turntable 3, the hoisting winch 6 and the luffing winch 7 are arranged on the hoisting platform, and above the slewing bearing 4 (that is, except for the two bases), after adding the installation auxiliary tool threaded sleeve 13, it can be rotated by the slewing mechanism 14. The front base 5 and the rear base 8 are anchored to the foundation by anchor bolts. The main boom 2 and the front strut of the derrick 10 share a hinge point, and the connecting line of the left and right hinge points passes through the center of the slewing bearing 4. The bottom of the rear strut of the derrick 9 is hinged to the rear base 8.

[0016] The implementation process of the utility model is detailed as follows: Define two positions, the working position and the assembly position. The working position is the position where the crane performs hoisting operations, perpendicular to the wharf; the assembly position is along the wharf direction, that is, at a 90-degree angle to the working position of the crane.

[0017] Crane assembly process: First, position and anchor the front base 5 and the rear base 8 at the working position, and assemble the upper part of the crane at the assembly position, as Figure 2 shown. First, install the slewing bearing 4 and the turntable 3 in place, install two winches (hoisting winch 6, luffing winch 7), then lay the rear strut 9 of the derrick on the ground, install the main boom 2 and the front strut 10 of the derrick, and note that appropriate supports such as the support frame 12 should be used for both to prevent damage to the components below. Connect the front strut 10 of the derrick to the rear strut 9, and note that only one pin is installed between the two sections of the front strut 9. Install the pull plate 11, thread the luffing rope, start the luffing winch 7, and use the weight of the main boom 2 to lift the derrick to the predetermined angle, as Figure 3 shown. Thread the hoisting rope, install the threaded sleeve 13, and raise the main boom. After the boom is raised to the predetermined angle, start the slewing mechanism, rotate the crane to the working position, connect the rear strut 9 of the derrick to the rear base 8, and remove the threaded sleeve 13 to complete the crane installation, as Figure 1 shown.

Claims

1. A mast crane, comprising a hook (1), a main boom (2), a front pedestal (5), a hoisting winch (6), a luffing winch (7), a rear pedestal (8), a backstay of the A-frame (9), a front stay of the A-frame (10) and a pull plate (11), characterized in that, A slewing bearing (4) is provided on the front base (5), a turntable (3) is provided on the slewing bearing (4), and the upper part of the crane is installed on the turntable (3). A support frame (12) and a threaded sleeve (13) for assisting in equipment installation are detachably connected to the front strut (10).

2. The derrick crane according to claim 1, characterized in that, A hoisting platform is provided on the side of the turntable (3), and the hoisting winch (6) and the luffing winch (7) are installed on the hoisting platform.

3. A mast crane according to claim 1, characterized in that, The main boom (2) and the front strut (10) of the guy derrick share a hinge point, and the connecting line of the left and right hinge points passes through the center of the slewing bearing (4).

4. A derrick crane according to claim 1, characterized in that, The bottom of the rear strut (9) of the guy derrick is hinged to the rear base (8).

5. A derrick crane according to claim 1, characterized in that, A slewing mechanism (14) is provided on one side of the turntable (3), and the slewing mechanism (14) drives the slewing bearing (4) and the parts above it.

6. A derrick crane according to claim 1, characterized in that, The front base (5) is anchored to the foundation by anchor bolts.

7. A derrick crane according to claim 1, wherein, The rear base (8) is anchored to the foundation by anchor bolts.

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