CN-121990134-A - Hoisting and positioning method and system for ship moving ramp

CN121990134ACN 121990134 ACN121990134 ACN 121990134ACN-121990134-A

Abstract

The application provides a hoisting and positioning method and system for a ship movable ramp, comprising the steps of S1, obtaining three-dimensional actual measurement coordinates of a plurality of corresponding key points on a movable ramp and a ship ramp opening, S2, respectively constructing precision compensation models of the movable ramp and the ramp opening based on a design model and the three-dimensional actual measurement coordinates, S3, performing simulation assembly on the two precision compensation models in a virtual environment, iteratively adjusting the pose of the precision compensation model of the movable ramp according to a preset assembly tolerance, calculating at least one group of positioning compensation parameters required for realizing final matching, S4, finishing prefabrication and installation of corresponding positioning accessories before the movable ramp is hoisted physically, and/or finishing the ramp opening, and S5, hoisting the preprocessed movable ramp to the ramp opening to realize one-time hoisting and positioning. By adopting the technical scheme, the subsequent repeated trial assembly links can be eliminated, and the field operation time and the labor investment are greatly reduced.

Inventors

WU NANPENG
GUO JINLONG
DONG BORAN
ZHANG WENZHEN
XUE YONG
LU JINYU
ZHUANG PENGCHENG
ZHANG BO
LIU HONGLIANG
YU LU

Assignees

江南造船(集团)有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260212

Claims (10)

1. A hoisting and positioning method for a ship moving ramp is characterized by comprising the following steps: S1, acquiring three-dimensional actual measurement coordinates of a movable ramp and a plurality of corresponding key points on a hull ramp opening; S2, respectively constructing precision compensation models of the movable ramp and the ramp opening based on the design model and the three-dimensional actual measurement coordinates; S3, performing simulation assembly on the two precision compensation models in a virtual environment, iteratively adjusting the pose of the precision compensation model of the movable ramp according to a preset assembly tolerance, and calculating at least one group of positioning compensation parameters required by final matching; S4, according to the positioning compensation parameters, prefabricating and installing corresponding positioning accessories and/or trimming the ramp openings are completed before the movable ramp entity is hoisted; s5, hoisting the movable ramp subjected to pretreatment to the ramp opening to realize one-time hoisting positioning.
2. The method for hoisting and positioning the movable ramp of the ship according to claim 1, wherein the step of constructing the precision compensation model comprises the steps of importing a designed three-dimensional model of the movable ramp or the ramp opening, and correlating the three-dimensional actual measurement coordinates imported into the corresponding key points with theoretical design coordinates thereof to obtain actual manufacturing deviation or installation deviation information of the three-dimensional actual measurement coordinates.
3. The lifting and positioning method of a moving ramp of a ship according to claim 1, wherein the positioning compensation parameters include a pad thickness parameter for restraining the up-down degrees of freedom of the moving ramp, a ramp opening trimming allowance parameter for restraining the left-right degrees of freedom, and a hinge installation position parameter for restraining the front-back degrees of freedom.
4. The lifting and positioning method for a moving ramp of a ship according to claim 3, wherein the thickness parameters of the pad include a thickness of a pressing plate installed on the opening of the ramp for pressing the sealing member, a thickness of a bolt pad for carrying the moving ramp, and a thickness of a height limit adjusting plate for adjusting a final height of the moving ramp.
5. The method according to claim 4, wherein when calculating the thickness of the hold-down plate, for an installation site having an inclination angle θ with respect to a horizontal plane, the thickness δ of the hold-down plate is calculated according to a formula δ=Δz×cos θ based on a measured height deviation Δz of the movable ramp from the ramp opening at the installation site.
6. The lifting and positioning method of a moving ramp of a ship according to claim 4 or 5, wherein when calculating the thickness of the height limit adjusting plate, the height of the sealing member is further subtracted to manufacture a negative tolerance value based on a thickness value determined according to the simulation assembly.
7. The method for positioning and hoisting the movable ramp of the ship according to claim 1, wherein the simulated assembly further comprises an optimization adjustment process, namely, firstly adjusting the height deviation between at least three datum points on the movable ramp model and corresponding points of the ramp opening to zero, calculating the residual deviation of a fourth point, distributing the residual deviation to the at least three datum points according to a preset rule, enabling the movable ramp model and the ramp opening model to achieve the best fitting state in the horizontal direction, and then performing adjustment and parameter calculation in other directions.
8. The hoisting and positioning method of a ship moving ramp according to claim 1, wherein the key points include: Deck edge points for evaluating the degree of matching of a moving ramp and a ramp opening deck surface; a seal mounting location point for assessing an amount of seal assembly compression; The mounting position points of the bearing bolt and the high-low limiting device are used for limiting the up-down freedom degree of the movable ramp; hinge mounting points for limiting the fore-aft freedom of the moving ramp.
9. The method for lifting and positioning a moving ramp of a ship according to claim 1, wherein the preset assembly tolerance includes a height difference tolerance between the moving ramp and the ramp opening deck surface, a compression tolerance of a sealing member, and a lateral clearance tolerance between the ramp and the opening.
10. A lifting and positioning system for a moving ramp of a ship for implementing the method of any one of claims 1 to 9, comprising: the measuring unit is used for measuring three-dimensional actual measurement coordinates of key points on the movable ramp and the ramp opening; The calculation unit is internally provided with modeling software and simulation matching software and is used for constructing an accuracy compensation model based on the design model and the three-dimensional actual measurement coordinates and calculating simulation assembly and positioning compensation parameters; The hoisting unit is used for hoisting the movable ramp with the prefabricated installation and the opening trimming of the accessory to the opening of the ramp and completing the positioning according to the calculated positioning compensation parameters; and the welding unit is used for carrying out welding fixation on the positioned movable ramp accessory.

Description

Hoisting and positioning method and system for ship moving ramp Technical Field The application belongs to the technical field of ship engineering, and particularly relates to a hoisting and positioning method and system for a movable ramp of a ship. Background In an automobile carrier (PCTC), an openable and closable movable ramp for connecting decks of all layers is a key for ensuring vehicle traffic, the deck hoisting and positioning process of the PCTC is complex, and the requirements of severe tightness, functionality and assembly clearance between the ramp and a ship opening are related. The traditional hoisting positioning method is highly dependent on field experience and manual measurement of constructors, is completed through repeated hoisting, gasket trial fitting, trimming adjustment and other modes, has various problems, such as large influence on matching quality of movable ramps and openings due to human factors, easy generation of position deviation, difficult guarantee of positioning precision, sealing failure, operation clamping stagnation or uneven bearing, function influence, potential safety hazard initiation more likely, low construction efficiency, high cost, serious slow overall construction progress due to lengthy field debugging period, great labor and material consumption for reworking and trimming, and the lack of standardization and predictability in the existing operation mode, large fluctuation of operation quality among different teams or projects, and incapability of realizing stable construction in batches. Therefore, with the development of ship construction technology, higher requirements are put on the construction precision and efficiency of PCTC ships, and technical improvements on the existing hoisting and positioning process are needed to meet the requirements of modern ship construction. Disclosure of Invention In view of the above-mentioned shortcomings of the prior art, the present application aims to provide a lifting and positioning method and system for a movable ramp of a ship, wherein the method can measure data related to the movable ramp and the opening of the ramp by using a total station, perform data simulation matching by using computer software, calculate the thickness of a movable ramp compacting plate, the thickness of a bolt backing plate, the thickness of a height limiting adjusting plate, the left and right allowance of the opening of the ramp, and the installation position of a hinge eye plate, and perform advanced installation of key accessories of the movable ramp, so as to solve the problems of low lifting and positioning precision, low efficiency and large influence by human factors of the movable ramp in the prior art, realize high-precision and high-efficiency lifting and positioning of the movable ramp, shorten the construction period and reduce the construction cost. The above and other related objects are achieved by a first aspect of the present application, which provides a hoisting and positioning method for a moving ramp of a ship, comprising the following steps: S1, acquiring three-dimensional actual measurement coordinates of a movable ramp and a plurality of corresponding key points on a hull ramp opening; S2, respectively constructing precision compensation models of the movable ramp and the ramp opening based on the design model and the three-dimensional actual measurement coordinates; S3, performing simulation assembly on the two precision compensation models in a virtual environment, iteratively adjusting the pose of the precision compensation model of the movable ramp according to a preset assembly tolerance, and calculating at least one group of positioning compensation parameters required by final matching; S4, according to the positioning compensation parameters, prefabricating and installing corresponding positioning accessories and/or trimming the ramp openings are completed before the movable ramp entity is hoisted; s5, hoisting the movable ramp subjected to pretreatment to the ramp opening to realize one-time hoisting positioning. In some embodiments, the step of constructing the precision compensation model includes importing a design three-dimensional model of a movable ramp or a ramp opening, and correlating the three-dimensional actual measurement coordinates imported with corresponding key points and theoretical design coordinates thereof to obtain actual manufacturing deviation or installation deviation information thereof. In some embodiments, the positioning compensation parameters include a shim thickness parameter for constraining up and down degrees of freedom of the movable ramp, a ramp opening trim margin parameter for constraining left and right degrees of freedom, and a hinge mounting position parameter for constraining fore and aft degrees of freedom. In some embodiments, the shim plate thickness parameters include a compression plate thickness for compressing the seal mounted on the ramp opening, a plu