Assembling and welding technique of ship water-jet propulsion flow-passage grid

A water-jet propulsion and grille technology, which is applied in shipbuilding, manufacturing tools, welding equipment, etc., can solve the problems that the movable model or sample box cannot be made according to the requirements, the structure is strong, and the shape of the hull is complicated, so as to avoid cracks or The effect of breaking the grid strips, ensuring the quality and strength, and meeting the technical requirements and precision requirements

Active Publication Date: 2009-05-06
JIANGNAN SHIPYARD GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The line shape of the hull at the runner grid is relatively complex and the structure is strong. Due to the assembly error of the hull, shrinkage and deformation after welding and other factors, the theoretical size and shape of the lofting will have different deviations from the actual sh

Method used

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  • Assembling and welding technique of ship water-jet propulsion flow-passage grid
  • Assembling and welding technique of ship water-jet propulsion flow-passage grid
  • Assembling and welding technique of ship water-jet propulsion flow-passage grid

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Embodiment Construction

[0031] Such as figure 1 As shown, the stainless steel runner grille of the water jet propulsion channel of the ship is composed of the front grille frame 1, the rear grille frame 5, the grille bar 2, the crosspiece 4 and the crosspiece seat 3, the grille bar 2 and the crosspiece 4. Vertical and horizontal intersect to form a grid shape, the two ends of the grid bar 2 are connected with the front grid frame 1 and the rear grid frame 5 respectively, and the crosspiece seat 3 is connected with the two ends of a middle crosspiece. Wherein the front grille frame 1, the rear grille frame 5 and the transom seat 3 need to be fixed in the hull flow channel, especially because the front grille frame 1 is a long curve, it should be well matched with the hull flow channel, and To reduce internal stress, the assembly of components should be carried out on-site in the flow channel. The specific process is as follows:

[0032] (1) Processing and manufacturing of grille components

[0033] ...

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Abstract

The invention discloses a welding process used for a marine water-jet propulsion chute grate. The process comprises the following steps: firstly, grate components are processed well and the margins are pre-preserved; the actual mounting is carried out to define the actual mounting positions and the final sizes of the components; the components are pre-fixed through spot welding; and after checked and passed, the components are welded in the ship chute to form a complete grate. The proper sequence and process parameters are adopted in the welding so as to reduce the internal stress as much as possible; after welding, the whole grate is demounted to repair welding seams and carry out aging treatment and then the grate is remounted so as to further enhance the strength of the grate and reduce internal stress. The invention can better satisfy the technical requirement and precision requirement of manufacturing, mounting and welding the chute grate so as to avoid the cracks or breaking of grate strips caused by the wearing of the grate structure due to ship vibration.

Description

technical field [0001] The invention belongs to the field of ship hull construction technology, and more specifically relates to a process for installing a welded flow channel grid in the water inlet flow channel during the construction of a ship using a water jet propeller. Background technique [0002] As a special ship propulsion device, water jet propulsion has strong anti-cavitation ability, small attachment resistance, good protection performance, low noise, simple transmission mechanism, strong ability to adapt to variable working conditions, good ship maneuvering and dynamic positioning performance And other features, and the capabilities of stranded self-rescue, turning, reversing, etc. are all unmatched by conventional propellers. Waterjet propulsion occupies a dominant position in the field of high-speed boats, and is also used on tugboats with variable working conditions and military ships that require high maneuverability. [0003] At present, the water inlet c...

Claims

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Application Information

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IPC IPC(8): B63B9/06B23K31/00
Inventor 钟广军
Owner JIANGNAN SHIPYARD GRP CO LTD
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