Hydraulic lifting stern platform

Abstract

The present invention relates to ship building technology, and is especially one hydraulically lifting stern platform including working platform, planar slipway, rolling wheels, rudder blade floor stand, propeller floor stand and four main elevating hydraulic cylinders. Of the four main elevating hydraulic cylinders, one is the master one and the others are slave ones. There is one linear displacement sensor in each of the hydraulic cylinders for sensing the elevating displacement and controlling the synchronous displacement. The rolling wheels have separately limited rotating direction, and the rudder blade floor stand and the propeller floor stand separately for installing rudder blade and propeller are screwed to the planar slipway. The present invention is used for installation of rudder blades and propeller and can shorten installation period and raise operation safety greatly.

Description

technical field [0001] The invention relates to a device in the technical field of shipbuilding, in particular to a stern hydraulic lifting working platform. Background technique [0002] With the development of ship construction technology, the same period of ship construction, construction quality, and construction safety have been greatly improved. The tonnage of ships is showing a trend of increasing development. There are more and more types of ships, and there is an urgent need for reliable, safe, stable and simple construction. Equipment, ship rudder blades and ship propellers are the main components of ships, which are characterized by large volume and mass, with a maximum mass of more than 100 tons per piece. The installation of ship rudder blades, propellers and hulls is carried out at the stern, that is, the installation space is limited by the structure of the stern Due to the limitations of the installation, large slipways or dock door cranes cannot be used for ...

AI Technical Summary

Problems solved by technology

There are several problems in this prior art: (1) Since the working platform is a scalene rectangle, the track and wheelbase of the rolling wheels below are asymmetrical. Readjusted by wheelbase and wheelbase, and introduces an unreliable factor to the stability when moving

(2) The 90° rotation of the scroll wheel under the workbench is done manually. When the workbench platform is switched from lateral movement to longitudinal movement, since several scroll wheels are driven by hydraulic motors respectively, if the scroll wheel rotates 90°, the hydraulic pressure will be caused. If the rotation direction of the motor is inconsistent, the movement of the workbench platform will cause great problems and dangers, and the manual operation guarantee is unreliable

(3) The four hydraulic cylinders at the four corners of the working platform are controlled by a set of oil circuits to rise or fall synchronously. On the one hand, because the oil path from the oil pipe (via) controls the valve, the length of the oil path to each hydraulic cylinder is different, resulting in oil pressure. Different losses will inevitably cause differences in the rising or falling speeds of the four hydraulic cylinders. On the other hand, the load of the working platform is very uneven, and the large and small loads cause differences in the rising or falling speeds of the hydraulic cylinders. The difference in displacement, when it is serious, the worktable will be seriously tilted, which will greatly lead to installation safety problems, and the rudder blades and propellers are installed with a certain accuracy on the hull, and serious tilt will increase the difficulty of installation

(4) lifting stand is installed on the movable sliding platform of both sides of working platform, when rudder blade is installed, because rudder blade is complex helical shape, often down is big and up is small, and the stand of prior art is straight stand, When the operator installs the hull on the top of the rudder blade, the upper end must be installed on the stand to operate the scaffolding, adding a springboard, which is time-consuming and unsafe

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