Assembling and disassembling tool of ship stern shaft nut and assembling and disassembling method

Abstract

The invention discloses an assembling and disassembling tool of a ship stern shaft nut and an assembling and disassembling method. According to the assembling and disassembling tool of the ship sternshaft nut, a copper sleeve capable of rotating along with the stern shaft nut is arranged on a steel shaft, a ball bearing is arranged between the copper sleeve and the steel shaft, so that the friction resistance generated when the nut and the copper sleeve rotate around the steel shaft can be effectively reduced, under the same condition, the assembling and disassembling tool can disassemble andassemble the stern shaft nut of a larger weight, the maximum weight of the assembled and disassembled ship stern shaft nut can be 3 ton, and the adaptability is high. The assembling and disassemblingmethod avoids damage to threads of the nut in the assembling and disassembling process, the screwing-in and screwing-out operation of the nut is more convenient and easy, and therefore the physical strength and time of the work personnel are saved beneficially.

Description

Technical field [0001] The invention relates to the technical field of shipbuilding, in particular to a ship stern shaft nut disassembly tool and a disassembly method. Background technique [0002] When repairing ships, some parts need to be disassembled and inspected. Among them, the weight of the ship's stern shaft propeller stern shaft nut is generally in the range of 0.3-3 tons, so it is loosened and screwed in. The work must be carried out with special tooling. [0003] At present, the installation method of hydraulic nuts on the stern shaft of large ships is: fix the lifting ring on the hydraulic nut, use the hand chain hoist to drive the wire rope to lift the lifting ring, lift the hydraulic nut to the installation position, and drag it by multiple installers. To the bolts of the stern shaft of a large ship, finally use a chain hoist or a crane to further tighten the hydraulic nut through a wire rope. Due to the limitation of the installation position of the hydraulic nut ...

AI Technical Summary

Problems solved by technology

[0005] The suspension bar and the pin shaft in the special installation tool for the ship stern shaft are vertically welded on the main body, and the three-section welded structure will cause a stress concentration area to appear on the main body of the installation tool. There will be a risk of fracture at the weld, which will lead to interruption of the maintenance project, economic loss or even personal injury to the on-site staff, and there is a potential safety hazard; Sliding to achieve balance adjustment. At the same time, the roller is sleeved on the pin shaft and installed by rotating the roller and the hydraulic nut together. In order to bear the heavy weight of the nut and the moment of inertia generated by its rotation, the sleeve and the roller must use Stronger materials also require a larger volume, so its own weight will increase, increasing the difficulty of lifting and turning the nut

In addition, the roller and the pin are sleeved and connected, and the friction coefficient of the contact surface is relatively large. In addition, the pressure generated by the nut on the roller during installation further increases the friction coefficient between the roller and the pin. There will be huge friction between them, which will consume too much physical strength and time for the staff

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