Shipbuilding gantry crane with polyline rigid leg

Abstract

The invention belongs to the technical field of hoisting equipment, and discloses a shipbuilding gantry crane with a polyline rigid leg. The gantry crane is characterized in that: the gantry crane comprises a polyline rigid leg, wherein the axis of the polyline rigid leg is a polyline. The polyline rigid leg is composed of a rigid leg upper portion and a rigid leg lower portion. The rigid leg upper portion is connected with a main beam lower cover plate, and the rigid leg lower portion is connected to a vehicle operating mechanism. The axes of the rigid leg upper portion and the rigid leg lower portion form a polyline. When there is no load effect, the rigid leg upper portion is inclined towards the outside of the span, such that the position of the main beam is deflected towards the rigid leg. A value selection condition of an included angle theta between the axis of the rigid leg upper portion and the axis of the rigid leg lower portion is that: when the crane is in operation, underload effect, the maximum value when the rigid leg is inclined towards the outside of the span equals the maximum value when the rigid leg is inclined towards the inside of the span. The gantry crane provided by the invention has advantages that: with the gantry crane, work loads of welding and fine-grinding are reduced, operation difficulties and risks are reduced, single-side inclination angle of the rigid leg is reduced, and security is enhanced.

Description

technical field [0001] The invention belongs to the technical field of hoisting equipment, and relates to a shipbuilding gantry crane with broken-line rigid legs. Background technique [0002] The gantry of a shipbuilding gantry crane consists of a main girder, rigid legs and flexible legs. The connection between the main girder and the rigid leg is a rigid node, and the connection between the main girder and the flexible leg is a hinge point. function), the axis of the main girder in the plane of the mast is an arched parabola, and the axes of the rigid legs and flexible legs in the plane of the mast are both a plumb line. Because the shipbuilding gantry crane has a large lifting capacity, span and lifting range, the weight and size of the gantry are also large, and it is generally assembled in sections after being manufactured. In order to ensure the designed camber of the main girder of the crane, each section of the main girder should be inclined at an angle relative to...

AI Technical Summary

Problems solved by technology

This requires developing and welding a weld joint with a circumference of tens of meters at a height of tens of meters or even hundreds of meters, and it is also necessary to ensure the connection accuracy and welding quality, which is quite difficult and dangerous.

In addition, after the portal frame is stressed, due to the deformation of the main beam and the characteristics of the rigid joints, the main beam as a whole will move with the change of the magnitude, direction and position of the load, and most of them will be biased towards the direction of the flexible leg, and the top of the rigid leg will also move. Moving with the main girder makes the axis of the rigid leg tilt away from the vertical state. When the span and height of the crane are large, this tilting in one direction makes people feel unsafe

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