Double-arm parallel crane and working method

Abstract

The invention provides a double-arm parallel crane and a working method. The double-arm parallel crane comprises a base, a slewing bearing, a slewing platform, slewing drive devices, a tripod and double-arm boom portions, wherein the base is connected with an outer ring of the slewing bearing; the slewing platform is connected with an inner ring screw of the slewing bearing; the tripod is fixedlymounted on the slewing platform; two arms are hinged on the slewing platform; the bottom surface of the base is a rectangular hollow base with a circular top surface; an upward first cylinder is disposed at the top of the base; the cross-sectional area of the first cylinder is smaller than the bottom surface area of the base; the central axis of the first cylinder is parallel to but not coincidentwith the central axis of the bottom surface of the base; the slewing platform comprises a quadrangular prism provided with a cavity, a second cylinder and a circular plate provided with a hollow structure; and when goods is picked up, the slewing drive devices are started to drive the slewing bearing and drive the slewing platform to rotate out to an appropriate position for picking up the goodsto a placement area. By adopting the crane, large lifting capacity, strong pressure bearing capacity, small self-weight, high stability, energy saving and environmental protection can be realized.

Description

technical field [0001] The invention relates to the technical field of cranes, and specifically discloses a double-arm parallel crane and a working method. Background technique [0002] Offshore platform cranes are mainly cranes used on offshore platforms. It is a kind of equipment for loading and unloading goods on offshore platforms and hoisting personnel to the platform. It is one of the most important production and safety equipment in offshore oil production. Due to the harsh sea environment, It has high requirements on safety, reliability, maintainability, wind resistance and corrosion resistance. At the same time, unlike general land cranes, offshore platform cranes are generally fixed on the ship platform, and the movement of the platform itself will have a strong impact on the movement of the load. During operation, the offshore crane will pitch, roll and heave with the waves. These movements will cause the load to swing, especially during the lifting process. Such...

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Problems solved by technology

[0005] In the patent document whose application number is CN201220444856.4, a large-scale surrounding pile offshore platform crane is disclosed. On the main deck, a base is provided on the spud shoe, a slewing support device is provided on the pedestal, a slewing platform is provided above the slewing support device, and a driver's cab and a machine room are provided on one side of the slewing platform. , the slewing platform is provided with a jib luffing winch, a main hoisting winch, and an auxiliary hoisting winch in turn, and a herringbone frame is also arranged on the slewing platform, and the top of the herringbone frame is provided with a top pulley block of the herringbone frame, The slewing platform is connected with a jib, the top of the jib is provided with a pulley block at the head of the jib, and the main hook, the auxiliary hook and the luffing hook are arranged under the top of the jib. Simple model, compact structure, small deck space occupation, strong adaptability, and high efficiency, but the spud shoe of the offshore platform crane is a cylindrical structure, and the crane base is also a cylindrical structure, and the load-bearing capacity of this structure is limited. Poor stability

[0006] In the patent document with the application number CN201320664157.5, a double-arm tower crane is disclosed, which includes a crane main body and a boom part, the crane main body and the boom part are hingedly connected, and a pull arm mechanism is also provided between them, and the pull arm One end of the mechanism is connected to the boom part, and the other end is connected to the main body of the crane through a steel rope; the boom part includes a first boom and a second boom, and the first boom and the second boom are arranged side by side and fixed by a connecting piece The pulling arm mechanism includes a first connecting rod, a second connecting rod, a connecting frame and a pulling arm pulley block, one end of the first connecting rod and the second connecting rod is connected with the pulling arm pulley block through the connecting frame, and the other end is connected with the boom portion, The boom of the crane adopts a double-arm structure. Under the condition of carrying the same load, the length of the single-arm boom is more than twice as long as that of the double-arm boom, so that the double-arm boom The self-weight is reduced, the structure size is reduced, and the stability of the boom structure is good, but the base of the crane is a long cylindrical structure, the fixed platform is directly connected to the hull, welded on the main deck of the ship, and the base is fixed on the fixed platform , the base seat has a long cylindrical structure, the diameter of the cylinder is small, the load-bearing capacity is poor, the height is large, the center of gravity is high, and the structural stability is poor; the double-arm tower crane is a fixed crane, the scope of application is limited, and the utilization rate is low

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