Ship stern door hoisting method

Abstract

The invention belongs to the technical field of ship manufacturing, and provides a ship stern door hoisting method which comprises the following steps: acquiring a compression precision error threshold value of a sealing gasket and generating a precision segmentation error condition; performing first-stage operation on the door frame and the stern door, and enabling first flatness data of the stern structure to meet a precision segmentation error condition; performing second-stage operation on the door frame; calculating a first compression precision error and a first deviation value of the sealing gasket; adjusting the position of the reverse jacking structure according to the first deviation value so as to mount the base structure; performing second-stage operation on the stern door; calculating to obtain a second compression precision error and a second deviation value; and adjusting preset mounting information of the sealing gasket according to the second deviation value to mount the sealing gasket. According to the hoisting method, compression precision control is decomposed into precision control in operation in different stages, accurate positioning of the base structure is achieved, the error of the compression amount of the sealing gasket is effectively reduced, hoisting operation of the stern door can be completed at a time, and the hoisting efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of shipbuilding, and in particular to a method for hoisting a stern door of a ship. Background Art

[0002] Ro-ro ship is a ship specially used for transporting vehicles, large cargoes, etc. In the design and construction of ro-ro ship, one of the core goals of ship design is to ensure the navigation safety of the ship, ensure that the stern door has good sealing performance when closed and extend the service life of the gasket. According to the design requirements, the compression of the gasket at the stern door hatch needs to be controlled within a certain range. For example, the compression error of the compression rubber is 6mm, that is, the compression of the compression rubber needs to be controlled within the range of 15mm±6mm. If the compression of the gasket is too small, it cannot effectively prevent seawater from penetrating into the cabin, resulting in damage to the tightness of the ship. If the compression of the gasket is too large, it will cause excessive extrusion of the gasket, accelerate its aging and damage, shorten its service life, and increase the maintenance cost and operation risk of the ship.

[0003] In order to meet the above compression requirements, the flatness of the installation position of the stern door clamping plate and the installation position of the door frame gasket needs to be controlled within 0.5 times the compression accuracy error. For example, when the gasket is a compressed rubber, the flatness at the compression position needs to be controlled within 3mm. However, in the actual shipbuilding process, there will be precision deviations in the stages of stern door segment production, door frame segment production, door frame segment assembly, and door frame segment installation. When the stern door is installed using traditional installation methods based on the theoretical installation dimensions, the compression of the gasket often fails to meet the design requirements, thereby reducing the service life of the gasket. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present application is to provide a method for hoisting the stern door of a ship, which is used to solve the problems existing in the prior art that the compression amount of the sealing gasket after the stern door is installed cannot meet the design requirements, and can achieve high-precision positioning of the base structure during the installation of the stern door, effectively reducing the precision error of the compression amount of the sealing gasket.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the present application provides a method for hoisting a stern door of a ship, comprising the following steps:

[0006] Obtaining a preset compression accuracy error threshold of the sealing gasket, and generating an accuracy segmentation error condition according to the compression accuracy error threshold;

[0007] Acquire first flatness data of the stern structure, perform first-stage operations on the door frame and the stern door respectively, and make the first balance data meet the precision segmented error condition;

[0008] Performing a second phase of operation on the door frame to install the door frame to the stern of the vessel;

[0009] Acquiring second flatness data of the stern structure in real time, and calculating a first compression precision error and a first deviation of the sealing gasket according to the first flatness data and the second flatness data;

[0010] adjusting the position of the inverted top structure according to the first deviation, and installing the base structure onto the inverted top structure;

[0011] Performing a second phase of operation on the stern door to install the stern door on the base structure;

[0012] According to the second flatness data, a second compression accuracy error and a second deviation are calculated;

[0013] According to the second deviation, preset installation information of the sealing gasket is adjusted to install the sealing gasket on the door frame.

[0014] Optionally, generating a precision segmentation error condition according to the compression precision error threshold comprises the following steps:

[0015] According to the compression accuracy error threshold, a stern door segmentation accuracy error threshold, a door frame segmentation accuracy error threshold, and a deck surface accuracy error threshold are generated; wherein the stern door segmentation accuracy error includes a stern door pressing surface flatness threshold, the door frame segmentation accuracy error threshold includes a door frame pressing surface flatness threshold and an inner frame surface flatness threshold, and the deck surface accuracy error threshold includes a first deck flatness threshold and a second deck flatness threshold;

[0016] Generate the precision segmentation error condition; wherein the precision segmentation error condition includes that the flatness error of the stern door is less than the stern door segmentation precision error threshold, the flatness error of the door frame is less than the door frame segmentation precision error threshold, and the flatness error of the stern deck is less than the deck surface precision error threshold.

[0017] Optionally, obtaining first flatness data of the stern structure, performing first-stage operations on the door frame and the stern door respectively, and making the first balance data meet the precision segmented error condition, comprises the following steps:

[0018] respectively detecting the stern door, the door frame and the stern deck to obtain the first flatness data;

[0019] According to the first flatness data, the first door frame pressing surface error, the inner frame flatness error, the first stern door pressing surface error and the first stern deck surface error are calculated respectively;

[0020] The first stage operation is performed on the door frame and the stern door respectively, and the first door frame pressing surface error is smaller than the door frame pressing surface flatness threshold, the inner frame isoplanarity error is smaller than the inner frame surface flatness threshold, the first stern door pressing surface error is smaller than the stern door pressing surface flatness threshold, and the first stern deck surface error is smaller than the first deck flatness threshold.

[0021] Optionally, performing a second stage operation on the door frame comprises the following steps:

[0022] Calculating the second stern deck surface error according to the first flatness data;

[0023] The door frame is subjected to a second stage operation, and the second stern deck surface error is made smaller than the second deck flatness threshold, so as to install the door frame to the stern of the ship.

[0024] Optionally, the second flatness data includes the flatness of the second door frame pressing surface and the flatness of the second stern door pressing surface; real-time acquisition of the second flatness data of the stern structure includes the following steps:

[0025] After the door frame completes the first stage of operation, a plurality of first detection points spaced apart from each other are arranged on the pressing surface of the door frame;

[0026] Testing the first testing point to obtain the flatness of the pressing surface of the second door frame;

[0027] After the stern door completes the first stage operation, a plurality of second detection points spaced apart from each other are arranged on the pressing surface of the stern door;

[0028] The second detection point is detected to obtain the flatness of the second stern door pressing surface.

[0029] Optionally, calculating and obtaining the first compression accuracy error and the first deviation of the sealing gasket comprises the following steps:

[0030] According to the second flatness data, a second door frame pressing surface error and a second stern door pressing surface error are calculated respectively;

[0031] Calculating the first compression accuracy error according to the second door frame pressing surface error and the second stern door pressing surface error;

[0032] The first deviation is calculated based on the first compression accuracy error and the compression accuracy error threshold.

[0033] Optionally, before adjusting the position of the inverted top structure according to the first deviation, the method further includes the following steps:

[0034] Determining the bow and stern directions of the ship, and obtaining the centerline of the stern door at the stern of the ship;

[0035] Acquire the distance between the hinge structure in the stern door and the center line of the stern door as the hinge distance to the base of the hinge structure along the width direction;

[0036] Acquire the distance between the base structure and the center line of the stern door as a first base-to-base distance of the base structure along the width direction;

[0037] Acquire a distance between the base structure and the top surface of the stern deck in the vertical direction as a second base-to-base distance of the base structure in the vertical direction;

[0038] The width direction, the bow and stern direction and the vertical direction are perpendicular to each other.

[0039] Optionally, the precision segmentation error condition further includes that the base position precision error is less than a base precision error threshold; and adjusting the position of the inverted top structure includes the following steps:

[0040] Calculate the difference between the distance between the hinge and the base and the distance between the corresponding base and the base as the misalignment deviation value;

[0041] Obtaining the difference between the horizontal heights of the first end and the second end of the inner frame surface of the door frame close to the stern deck along the vertical direction as the door frame horizontal height difference; wherein the first end and the second end are respectively located on opposite sides of the inner frame surface along the width direction;

[0042] Adjusting the position of the inverted top structure along the width direction so that the misalignment deviation value is less than the base accuracy error threshold;

[0043] Adjusting the position of the anti-top structure along the vertical direction so that the precision error of the distance between the second base and the base is less than 0.5 times the horizontal height difference of the door frame;

[0044] According to the first deviation, the position of the anti-top structure is adjusted along the bow and stern directions.

[0045] Optionally, calculating the second compression precision error and the second deviation comprises the following steps:

[0046] According to the second flatness data acquired in real time, the third door frame pressing surface error and the third stern door pressing surface error are calculated respectively;

[0047] The second compression accuracy error is calculated according to the third door frame pressing surface error and the third stern door pressing surface error;

[0048] The second deviation is calculated based on the second compression accuracy error and the compression accuracy error threshold.

[0049] Optionally, the preset installation information of the sealing gasket includes a sealing gasket installation precision error, and when the second deviation is a non-zero value, the difference between the sealing gasket installation precision error and the second deviation is calculated as a new sealing gasket installation precision error.

[0050] As described above, compared with the prior art, the method for hoisting the stern door of a ship provided in the present application has at least the following beneficial effects:

[0051] According to the compression accuracy error threshold of the sealing gasket, the compression accuracy control of the sealing gasket is decomposed into the accuracy control in the first stage operation and the second stage operation to generate the accuracy segmented error condition, and at the same time, the flatness of the inner frame surface of the door frame and the stern deck is detected, and the first deviation, the misalignment deviation value, and the accuracy error of the second base distance are calculated in advance to achieve the precision positioning of the door frame and the stern door, which can effectively reduce the accuracy error of the compression of the sealing gasket after the stern door is hoisted, and ensure that the compression of the sealing gasket can meet the design requirements; and, by adjusting the preset installation information of the sealing gasket through the second deviation value, the accuracy error of the compression of the sealing gasket is further reduced, and the compression of the sealing gasket after the stern door is hoisted can be ensured to meet the design requirements. Therefore, the hoisting method of the ship stern door of the present application can effectively reduce the error of the compression of the sealing gasket, ensure that the compression of the sealing gasket meets the design requirements, and at the same time enable the stern door to complete the hoisting operation at one time, improve the hoisting efficiency of the stern door, reduce the time of hoisting hook, reduce the risk of hoisting, and improve the hoisting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 Shown is a flow chart of a method for hoisting a stern door of a ship provided in an embodiment of the present application.

[0054] Figure 2 Shown is a schematic structural diagram of the stern of a ship provided in an embodiment of the present application.

[0055] Figure 3 Shown is a schematic structural diagram of the stern deck in the vicinity of the door frame installation position provided in an embodiment of the present application.

[0056] Figure 4Shown is a schematic structural diagram of a door frame provided in an embodiment of the present application.

[0057] Figure 5 Shown is a schematic diagram of forming a first detection point on the pressing surface of a door frame provided by an embodiment of the present application.

[0058] Figure 6 Shown is a schematic diagram of forming a second detection point on the pressing surface of the stern door provided by an embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to make the technical purpose, technical solution and technical effect of the present application clearer, the technical solution in the present application will be clearly and completely described in conjunction with the embodiments below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0060] Therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0061] In the description of the present application, it should be noted that the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the implementation or example are included in at least one implementation or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more implementations or examples in a suitable manner.

[0062] In the prior art, due to the precision deviations in the stages of segmented production of the stern door, segmented production of the door frame, assembly of the door frame sections, and installation of the door frame sections, when the stern door is installed using the traditional installation method according to the theoretical installation size, the compression amount of the gasket often fails to meet the design requirements, thereby reducing the service life of the gasket. The traditional method of increasing the precision requirements for the surface flatness of the stern door and the door frame so that the compression amount of the gasket meets the design requirements will significantly reduce the work efficiency of the stern door and the door frame during the manufacturing and installation process, and has a poor effect on improving the error of the compression amount of the gasket.

[0063] In order to solve the above problems in the prior art, the present embodiment provides a method for hoisting a stern door of a ship, which can achieve high-precision positioning and position calibration of the base structure during the installation of the stern door, thereby effectively reducing the precision error of the compression amount of the sealing gasket.

[0064] Reference Figure 1 The method for hoisting a ship stern door provided in this embodiment includes steps S1 to S8, specifically including:

[0065] Step S1: obtaining a preset compression accuracy error threshold of the sealing gasket, and generating an accuracy segmentation error condition according to the compression accuracy error threshold;

[0066] Step S2: obtaining the first flatness data of the stern structure, performing the first stage operation on the door frame and the stern door respectively, and making the first flatness data meet the precision segmentation error condition;

[0067] Step S3: performing a second stage operation on the door frame to install the door frame to the stern of the ship;

[0068] Step S4: acquiring the second flatness data of the stern structure in real time, and calculating the first compression accuracy error and the first deviation of the sealing gasket according to the first flatness data and the second flatness data;

[0069] Step S5: adjusting the position of the inverted top structure according to the first deviation, and installing the base structure on the inverted top structure;

[0070] Step S6: performing a second phase operation on the stern door to install the stern door on the base structure;

[0071] Step S7: calculating a second compression accuracy error and a second deviation according to the second flatness data;

[0072] Step S8: adjusting the preset installation information of the sealing gasket according to the second deviation so as to install the sealing gasket on the door frame.

[0073] The following will describe in detail the method for hoisting the stern door of a ship of this embodiment in conjunction with the accompanying drawings. It should be noted that the above sequence does not strictly represent the step sequence of the method for hoisting the stern door of a ship protected by this application, and those skilled in the art can adjust it according to actual needs.

[0074] First, step S1 is executed to obtain a preset compression accuracy error threshold of the sealing gasket, and generate an accuracy segmentation error condition according to the compression accuracy error threshold.

[0075] In an optional embodiment, the sealing gasket is, for example, a rubber gasket, and the compression accuracy error threshold of the sealing gasket is 6 mm. The compression amount of the sealing gasket at the stern hatch of the ship is denoted as a, and the compression amount of the sealing gasket is required to be within the range of a±6 mm. For example, if a is 15 mm, the compression amount of the sealing gasket is between 15 mm±6 mm.

[0076] In an optional embodiment, executing step S1 includes the following steps: generating a stern door segmentation accuracy error threshold, a door frame segmentation accuracy error threshold, and a deck surface accuracy error threshold according to the compression accuracy error threshold; generating the accuracy segmentation error condition; wherein the accuracy segmentation error condition includes that the stern door flatness error is less than the stern door segmentation accuracy error threshold, the door frame flatness error is less than the door frame segmentation accuracy error threshold, and the stern deck flatness error is less than the deck surface accuracy error threshold, the stern door segmentation accuracy error includes the stern door pressing surface flatness threshold, the door frame segmentation accuracy error threshold includes the door frame pressing surface flatness threshold and the inner frame surface flatness threshold, and the deck surface accuracy error threshold includes the first deck flatness threshold and the second deck flatness threshold.

[0077] Furthermore, the stern door pressing surface flatness threshold, the door frame pressing surface flatness threshold and the inner frame surface flatness threshold can be set to 1 / 4 of the compression accuracy error threshold, for example, 1.5 mm, the first deck flatness threshold can be set to 1 mm, and the second deck flatness threshold can be set to 1 / 2 of the compression accuracy error threshold, for example, 3 mm.

[0078] Further, executing step S1 also includes: generating a base accuracy error threshold according to the compression accuracy error threshold. The accuracy segmentation error condition also includes that the base position accuracy error is less than the base accuracy error threshold. Furthermore, the base accuracy error threshold can be set to a value less than the compression accuracy error threshold, for example, 5 mm.

[0079] Then, step S2 is executed to obtain the first flatness data of the stern structure, perform the first stage operation on the door frame and the stern door respectively, and make the first flatness data meet the precision segmentation error condition.

[0080] The first flatness data is the flatness data of the relevant surface in the stern structure of the ship. Figure 2 This is a schematic diagram of the ship's stern structure. Figure 2 In the figure, the rectangular opening is the hatch, and the stern structure may include, for example, a stern door, a door frame, a stern deck and other related structures. The stern deck is the deck at the bottom inner side of the hatch, the door frame is located at the hatch, and the structure extending outward from the hatch is the stern door. Figure 3 The structural diagram of the stern deck is shown. When obtaining the first flatness data of the stern deck, Figure 3The rectangular area formed by the long and medium-length dotted lines is inspected, and other adjacent areas may also be inspected to monitor the flatness of the stern deck. Figure 4 The schematic diagram of the structure of the door frame is shown, wherein the surface where the gray thick line is located is the compression surface of the door frame. Optionally, the first stage operation can be, for example, a segmented manufacturing stage. When the first stage operation is performed on the door frame and the stern door, the first flatness data is obtained by measuring, so that the surface flatness of the door frame, the stern door and the stern deck can meet the precision segmented error condition, effectively reducing the adverse effect of the uneven surface conditions of the door frame, the stern door and the stern deck on the compression of the sealing gasket.

[0081] In an optional embodiment, executing step S2 includes the following steps: detecting the stern door, door frame and stern deck respectively to obtain first flatness data; calculating the first door frame pressing surface error, inner frame coplanarity error, first stern door pressing surface error and first stern deck surface error respectively according to the first balance data; performing the first stage operation on the door frame and stern door respectively, and making the first door frame pressing surface error less than the door frame pressing surface flatness threshold, the inner frame coplanarity error less than the inner frame surface flatness threshold, the first stern door pressing surface error less than the stern door pressing surface flatness threshold, and the first stern deck surface error less than the first deck flatness threshold.

[0082] The first flatness data includes the flatness of the first door frame pressing surface of the door frame and the flatness of the inner frame, the flatness of the first stern door pressing surface of the stern door, and the flatness of the first stern deck surface of the stern deck. When the first stage operation is performed on the door frame, the pressing surface and the inner frame surface of the door frame are detected to obtain the flatness of the first door frame pressing surface and the inner frame congruence, and the first door frame pressing surface error and the inner frame congruence error are calculated according to the flatness of the first door frame pressing surface and the inner frame congruence; when the first stage operation is performed on the door frame, the surface of the stern deck is detected to obtain the flatness of the first stern deck surface, and the first stern deck surface error is calculated according to the flatness of the first stern deck surface; when the first stage operation is performed on the stern door, the pressing surface of the stern door is detected to obtain the flatness of the first stern door pressing surface, and the first stern door pressing surface error is calculated according to the flatness of the first stern door pressing surface.

[0083] Next, step S3 is executed to perform a second-stage operation on the door frame to install the door frame to the stern of the ship. The second-stage operation may be, for example, a loading stage.

[0084] In an optional embodiment, executing step S3 may include the following steps: calculating the second stern deck surface error according to the first flatness data; performing the second stage operation on the door frame, and making the second stern deck surface error less than the second deck flatness threshold, so as to install the door frame to the stern of the ship. Wherein, the first flatness data also includes the flatness of the second stern deck surface, and when performing the second stage operation on the door frame, the surface of the stern deck is detected to obtain the flatness of the second stern deck surface, and the second stern deck surface error is calculated according to the flatness of the second stern deck surface.

[0085] Next, step S4 is performed to obtain the second flatness data of the stern structure in real time, and to calculate the first compression accuracy error and the first deviation of the sealing gasket according to the first flatness data and the second flatness data.

[0086] Specifically, the first compression accuracy error of the sealing gasket is calculated based on the first flatness data and the second flatness data, and the first deviation is calculated based on the first compression accuracy error and the compression accuracy error threshold. Optionally, the first deviation is the difference between the first compression accuracy error calculated above and the compression accuracy error threshold.

[0087] In an optional embodiment, the second flatness data includes the flatness of the second door frame pressing surface and the flatness of the second stern door pressing surface. In executing step S4, the second flatness data of the stern structure is obtained in real time, including the following steps: after the door frame completes the first stage operation, a number of first detection points spaced apart from each other are set on the pressing surface of the door frame; the first detection points are detected to obtain the flatness of the second door frame pressing surface; after the stern door completes the first stage operation, a number of second detection points spaced apart from each other are set on the pressing surface of the stern door; the second detection points are detected to obtain the flatness of the second stern door pressing surface.

[0088] Figure 5 A schematic diagram of setting the first detection point on the door frame clamping surface is shown. The positions of several black dots in the figure are the first detection points. It can be understood that the door frame clamping surface is a closed annular surface, which also includes the side of the stern deck at the bottom of the hatch to form a closed rectangular annular surface. Figure 6 A schematic diagram of setting a second detection point on the pressing surface of the stern door is shown, the number and position of the first detection point corresponds to the number and position of the second detection point, and after the stern door is installed, when the stern door is closed, the second detection point on the stern door presses the first detection point on the door frame through the sealing pad. Further, a preset step length can be used to set multiple first detection points and second detection points, for example, a step length of 500 mm or other suitable values ​​is used to set multiple first detection points and second detection points.

[0089] In an optional embodiment, step S4 is executed to calculate the first compression accuracy error and the first deviation of the sealing gasket, including the following steps: according to the second flatness data, respectively calculating the second door frame pressing surface error and the second stern door pressing surface error; according to the second door frame pressing surface error and the second stern door pressing surface error, calculating the first compression accuracy error; according to the first compression accuracy error and the compression accuracy error threshold, calculating the first deviation.

[0090] Furthermore, the second flatness data includes the flatness of the second door frame pressing surface and the flatness of the second stern door pressing surface. Based on the flatness of the second door frame pressing surface, the second door frame pressing surface error at the first detection point of the door frame is calculated. Based on the flatness of the second stern door pressing surface, the second stern door pressing surface error at the second detection point of the stern door is calculated.

[0091] Further, the second door frame pressing surface error at the first detection point of the door frame is recorded as Fn, the second stern door pressing surface error at the corresponding second detection point of the stern door is recorded as fn, the compression accuracy error threshold is recorded as C0, the first compression accuracy error is recorded as C1, and the first deviation is recorded as D1. The first compression accuracy error is C1 = |Fn-fn|, when C0>C1, the first deviation D1=0, when C0<C1, the first deviation D1=C1-C0.

[0092] Next, step S5 is performed to adjust the position of the inverted top structure according to the first deviation, and to install the base structure onto the inverted top structure.

[0093] The first deviation is the position deviation of the base structure to ensure the design requirements, that is, it corresponds to the position deviation of the anti-top structure. By adjusting the position of the anti-top structure, the position of the base structure installed on the anti-top structure can be calibrated to achieve precise positioning of the base structure and reduce the risk of adversely affecting the compression of the sealing gasket.

[0094] In an optional embodiment, before executing step S5, the following steps are also included: determining the bow and stern directions of the ship, and obtaining the centerline of the stern door at the stern of the ship; obtaining the distance between the hinge structure in the stern door and the centerline of the stern door, as the hinge distance to the base of the hinge structure along the width direction; obtaining the distance between the base structure and the centerline of the stern door, as the first base distance to the base of the base structure along the width direction; obtaining the distance between the base structure and the top surface of the stern deck along the vertical direction, as the second base distance to the base of the base structure along the vertical direction; wherein the width direction, the bow and stern direction and the vertical direction are mutually perpendicular, corresponding to Figure 2 The x-axis direction, y-axis direction and z-axis direction are shown. Figure 2 , Figure 5 and Figure 6 The construction line (straight dashed line) shown in is the center line of the stern door described in this embodiment. Figure 3 The area where the 7 dotted boxes are located is the installation location of the base structure. Figure 5 The structures within the 7 dotted boxes shown in the figure are the base structures.

[0095] Furthermore, the precision segmentation error condition also includes that the base position precision error is less than the base precision error threshold, and step S5 is executed to adjust the position of the anti-top structure, including the following steps: calculating the difference between the distance between the hinge and the base and the corresponding first base and the base as the misalignment deviation value; obtaining the difference between the horizontal heights of the first end and the second end of the inner frame surface of the door frame close to the stern deck side in the vertical direction as the door frame horizontal height difference; wherein the first end and the second end are respectively located on opposite sides of the inner frame surface in the width direction; adjusting the position of the anti-top structure in the width direction so that the misalignment deviation value is less than the base precision error threshold; adjusting the position of the anti-top structure in the vertical direction so that the precision error of the distance between the second base and the base is less than 0.5 times the horizontal height difference of the door frame height; adjusting the position of the anti-top structure in the bow and stern direction according to the first deviation. By adjusting the position of the anti-top structure in the width direction, bow and stern direction and vertical direction, the precise positioning of the base structure is achieved, which can effectively reduce the precision error of the compression amount of the sealing gasket after the stern door is installed.

[0096] Furthermore, the number of base structures is set to 7, for example, and the corresponding first base-to-base distances are B1, B2, B3, B4, B5, B6, and B7, respectively. The number of hinge structures corresponding to the above 7 base structures is also 7, and the corresponding hinge-to-base distances are b1, b2, b3, b4, b5, b6, and b7, respectively. The corresponding misalignment deviation values ​​are B1-b1, B2-b2, B3-b3, B4-b4, B5-b5, B6-b6, and B7-b7. It should be noted that the above number of base structures is only for the convenience of illustrating the solution of the present application, and the specific number can be set according to actual needs, and is not limited thereto.

[0097] Further, the base structure includes two main hinge bases and a plurality of secondary hinge bases located between the two main hinge bases. The position of each base structure along the width direction can be determined by the distance between the base center point between the two main hinge bases and the center line of the stern door. For example, the theoretical value of the distance between the base center point and the center line of the stern door can be preset to 600 mm. The position of each base structure along the vertical direction and the precision error of the distance between the second base and the base can be determined by the distance between the base structure and the top surface of the stern deck. For example, the theoretical value of the distance between the base structure and the top surface of the stern deck can be preset to 485 mm.

[0098] Next, step S6 is executed to perform a second phase operation on the stern door to install the stern door on the base structure.

[0099] The second stage operation may be, for example, a loading stage operation. The stern door is provided with a plurality of hinge structures, and the stern door may be installed to the stern of the ship by hoisting or other suitable means, so that the hinge structure of the stern door matches the base structure.

[0100] Next, step S7 is executed to calculate a second compression accuracy error and a second deviation according to the second flatness data.

[0101] Specifically, after completing step S6 and installing the stern door on the base structure, the second compression accuracy error of the sealing gasket is calculated based on the second flatness data obtained in real time, and the second deviation is calculated based on the second compression accuracy error and the compression accuracy error threshold. Optionally, the second deviation is the difference between the calculated second compression accuracy error and the compression accuracy error threshold. In this embodiment, in the process of executing steps S4 to S7, the flatness of the stern door, door frame and other structures in the stern structure is detected in real time to update the second flatness data in real time, realize real-time monitoring of the flatness of the stern structure, and ensure that the second flatness data can reflect the flatness of the stern structure at the current stage.

[0102] In an optional embodiment, step S7 is executed to calculate the second compression accuracy error and the second deviation, including the following steps: according to the second flatness data acquired in real time, respectively calculating the third door frame pressing surface error and the third stern door pressing surface error; according to the third door frame pressing surface error and the third stern door pressing surface error, calculating the second compression accuracy error; according to the second compression accuracy error and the compression accuracy error threshold, calculating the second deviation.

[0103] Further, the second flatness data includes the flatness of the second door frame pressing surface and the flatness of the second stern door pressing surface. After completing step S6 and installing the stern door on the base structure, the third door frame pressing surface error at the first detection point of the door frame is calculated based on the real-time acquired second door frame pressing surface flatness, and the third stern door pressing surface error at the second detection point is calculated based on the real-time acquired second stern door pressing surface flatness. The values ​​of the third door frame pressing surface error and the third stern door pressing surface error can be positive, negative or zero.

[0104] Furthermore, the compression accuracy error threshold is recorded as C0, the second deviation is recorded as D2, the second compression accuracy error is C2, the second compression accuracy error C2 is the difference between the third door frame clamping surface error and the third stern door clamping surface error, when C0>C2, the second deviation D2=0, when C0<C2, the second deviation D2=C2-C0.

[0105] Finally, step S8 is performed to adjust the preset installation information of the sealing gasket according to the second deviation so as to install the sealing gasket on the door frame.

[0106] The preset installation information of the gasket includes at least the gasket installation precision error, and the gasket installation precision error is adjusted according to the second deviation to update the preset installation information of the gasket. Optionally, when the second deviation is a non-zero value, the difference between the gasket installation precision error and the second deviation is calculated as a new gasket installation precision error to complete the adjustment of the preset installation information of the gasket.

[0107] In this embodiment, the stern door flatness error is the error of the surface flatness of the stern door, at least including the first stern door pressing surface error, the second stern door pressing surface error, and the third stern door pressing surface error; the door frame flatness error is the error of the surface flatness of the door frame, at least including the first door frame pressing surface error, the second door frame pressing surface error, the third door frame pressing surface error and the inner frame flatness error; the stern deck flatness error is the error of the surface flatness of the stern deck, at least including the first stern deck surface error and the second stern deck surface error.

[0108] In this embodiment, a total station or other suitable equipment can be used to detect the flatness of the stern structure, such as the first flatness data and the second flatness data, and a steel wire can be used in conjunction with a wire frame ( Figure 5 The two cylindrical structures on both sides of the middle base structure are the wire draw frames) to locate the positions of the hinge structure and the base structure, and then obtain data such as the distance between the hinge and the base, the distance between the first base and the base, and the distance between the second base and the base.

[0109] As described above, by decomposing the compression precision control of the gasket into the precision control of the segmentation stage and the loading stage, and detecting the flatness of the inner frame surface of the door frame and the stern deck at the same time, to generate the precision segmentation error condition, the first deviation, the misalignment deviation value, and the second base-to-base distance precision error are calculated in advance, so that the position of the relevant stern structure can be adjusted during the segmentation stage and the loading stage of the door frame and the stern door, respectively, to achieve high-precision positioning of the base structure and the stern door, effectively reducing the precision error of the compression of the gasket, and adjusting the preset installation information of the gasket through the second deviation, further reducing the precision error of the compression of the gasket, effectively ensuring that after the stern door is installed, the precision error of the compression of the gasket can meet the design requirements. It can be seen that the hoisting method of this embodiment can effectively reduce the error of the compression of the gasket, ensure that the compression of the gasket meets the design requirements, and at the same time improve the hoisting efficiency of the stern door, ensure that the stern door completes the hoisting operation at one time, reduce the time of hoisting hooks, reduce the risk of hoisting, and improve the hoisting efficiency.

[0110] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify, change or combine the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A method for hoisting a ship stern door, characterized in that: The following steps are involved: Obtaining a preset compression accuracy error threshold of the sealing gasket, and generating an accuracy segmentation error condition according to the compression accuracy error threshold; Acquire first flatness data of the stern structure, perform first-stage operations on the door frame and the stern door respectively, and make the first balance data meet the precision segmented error condition; Performing a second phase of operation on the door frame to install the door frame to the stern of the vessel; Acquiring second flatness data of the stern structure in real time, and calculating a first compression precision error and a first deviation of the sealing gasket according to the first flatness data and the second flatness data; adjusting the position of the inverted top structure according to the first deviation, and installing the base structure onto the inverted top structure; Performing a second phase of operation on the stern door to install the stern door on the base structure; According to the second flatness data, a second compression accuracy error and a second deviation are calculated; According to the second deviation, preset installation information of the sealing gasket is adjusted to install the sealing gasket on the door frame.

2. The method for hoisting a ship stern door according to claim 1, characterized in that: Generating a precision segmentation error condition according to the compression precision error threshold comprises the following steps: According to the compression accuracy error threshold, a stern door segmentation accuracy error threshold, a door frame segmentation accuracy error threshold, and a deck surface accuracy error threshold are generated; wherein the stern door segmentation accuracy error includes a stern door pressing surface flatness threshold, the door frame segmentation accuracy error threshold includes a door frame pressing surface flatness threshold and an inner frame surface flatness threshold, and the deck surface accuracy error threshold includes a first deck flatness threshold and a second deck flatness threshold; Generate the precision segmentation error condition; wherein the precision segmentation error condition includes that the flatness error of the stern door is less than the stern door segmentation precision error threshold, the flatness error of the door frame is less than the door frame segmentation precision error threshold, and the flatness error of the stern deck is less than the deck surface precision error threshold.

3. The method for hoisting a ship stern door according to claim 2, characterized in that: Acquiring first flatness data of the stern structure, performing first-stage operations on the door frame and the stern door respectively, and making the first balance data meet the precision segmented error condition, includes the following steps: respectively detecting the stern door, the door frame and the stern deck to obtain the first flatness data; According to the first flatness data, the first door frame pressing surface error, the inner frame flatness error, the first stern door pressing surface error and the first stern deck surface error are calculated respectively; The first stage operation is performed on the door frame and the stern door respectively, and the first door frame pressing surface error is smaller than the door frame pressing surface flatness threshold, the inner frame isoplanarity error is smaller than the inner frame surface flatness threshold, the first stern door pressing surface error is smaller than the stern door pressing surface flatness threshold, and the first stern deck surface error is smaller than the first deck flatness threshold.

4. The method for hoisting a ship stern door according to claim 2, characterized in that: The second stage of operation on the door frame includes the following steps: Calculating the second stern deck surface error according to the first flatness data; The door frame is subjected to a second stage operation, and the second stern deck surface error is made smaller than the second deck flatness threshold, so as to install the door frame to the stern of the ship.

5. The method for hoisting a ship stern door according to claim 1, characterized in that: The second flatness data includes the flatness of the second door frame pressing surface and the flatness of the second stern door pressing surface; real-time acquisition of the second flatness data of the stern structure includes the following steps: After the door frame completes the first stage of operation, a plurality of first detection points spaced apart from each other are arranged on the pressing surface of the door frame; Testing the first testing point to obtain the flatness of the pressing surface of the second door frame; After the stern door completes the first stage operation, a plurality of second detection points spaced apart from each other are arranged on the pressing surface of the stern door; The second detection point is detected to obtain the flatness of the second stern door pressing surface.

6. The method for hoisting a ship stern door according to claim 1, characterized in that: Calculating the first compression accuracy error and the first deviation of the sealing gasket comprises the following steps: According to the second flatness data, a second door frame pressing surface error and a second stern door pressing surface error are calculated respectively; Calculating the first compression accuracy error according to the second door frame pressing surface error and the second stern door pressing surface error; The first deviation is calculated based on the first compression accuracy error and the compression accuracy error threshold.

7. The method for hoisting a ship stern door according to claim 1, characterized in that: Before adjusting the position of the inverted top structure according to the first deviation, the method further includes the following steps: Determining the bow and stern directions of the ship, and obtaining the centerline of the stern door at the stern of the ship; Acquire the distance between the hinge structure in the stern door and the center line of the stern door as the hinge distance to the base of the hinge structure along the width direction; Acquire the distance between the base structure and the center line of the stern door as a first base-to-base distance of the base structure along the width direction; Acquire a distance between the base structure and the top surface of the stern deck in the vertical direction as a second base-to-base distance of the base structure in the vertical direction; The width direction, the bow and stern direction and the vertical direction are perpendicular to each other.

8. The method for hoisting a ship stern door according to claim 6, characterized in that: The precision segmentation error condition also includes that the base position precision error is less than the base precision error threshold; adjusting the position of the anti-top structure includes the following steps: Calculate the difference between the distance between the hinge and the base and the distance between the corresponding base and the base as the misalignment deviation value; Obtaining the difference between the horizontal heights of the first end and the second end of the inner frame surface of the door frame close to the stern deck along the vertical direction as the door frame horizontal height difference; wherein the first end and the second end are respectively located on opposite sides of the inner frame surface along the width direction; Adjusting the position of the inverted top structure along the width direction so that the misalignment deviation value is less than the base accuracy error threshold; Adjusting the position of the anti-top structure along the vertical direction so that the precision error of the distance between the second base and the base is less than 0.5 times the horizontal height difference of the door frame; According to the first deviation, the position of the anti-top structure is adjusted along the bow and stern directions.

9. The method for hoisting a ship stern door according to claim 1, characterized in that: Calculating the second compression precision error and the second deviation comprises the following steps: According to the second flatness data acquired in real time, the third door frame pressing surface error and the third stern door pressing surface error are calculated respectively; The second compression accuracy error is calculated according to the third door frame pressing surface error and the third stern door pressing surface error; The second deviation is calculated based on the second compression accuracy error and the compression accuracy error threshold.

10. The method for hoisting a ship stern door according to claim 1, characterized in that: The preset installation information of the sealing gasket includes a sealing gasket installation precision error. When the second deviation is a non-zero value, the difference between the sealing gasket installation precision error and the second deviation is calculated as a new sealing gasket installation precision error.

Images