A device and method for measuring the flatness of a container ship butt plate

Abstract

The application discloses a device and method for measuring the butt joint flatness of a thick plate of a container ship. The device is characterized in that: the fixed assembly is clamped at a section edge, the left and right two measuring assemblies are respectively clamped on a hatch coaming plate and an inner longitudinal wall plate, the slide rod of the fixed assembly is pulled, the slide rod drives the telescopic rod to be elongated or shortened, and the position of the measuring assembly is adjusted, so that the flatness deviation of different span positions is quickly measured, the flatness of the hatch coaming plate and the inner longitudinal wall plate of the container ship section is quickly and synchronously measured, the complex process of traditional positioning and calculation multiple times is simplified into intuitive scale reading, and the measuring efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to an apparatus and method for measuring the flatness of the butt joint of thick plates in container ships. Background Technology

[0002] During shipbuilding, especially in the large-scale assembly phase of container ships, the outer plating of the hull top section serves as the base surface. The hatch cofferdams, parallel to the ground, are installed on the main deck, which is perpendicular to the ground. Simultaneously, inner longitudinal bulkheads are installed vertically below the main deck, also parallel to the ground. According to the section construction flatness requirements, the hatch cofferdams and inner longitudinal bulkheads should be on the same horizontal line to ensure the integrity and sealing of the hatch structure. However, in actual construction, after the sections are side-welded, due to welding stress and thermal deformation, the hatch cofferdams and inner longitudinal bulkheads often experience localized deformation, causing them to be out of alignment. This deformation not only affects the assembly accuracy of the sections but also leads to difficulties in subsequent assembly work and may even affect the overall structural strength and serviceability of the ship.

[0003] Currently, the traditional method for inspecting whether the inner longitudinal bulkheads and hatch coamings of container ships are on the same horizontal line is to use a level, laser measuring instrument, or string line method, taking the main deck as the center and measuring the flatness at equal intervals on both sides of the hatch coamings and inner longitudinal bulkheads. This method has the following problems: First, the measurement process is cumbersome, requiring multiple positioning and measurement; second, it is difficult to obtain the relative flatness of the plates at two different locations simultaneously, requiring calculation; third, the measurement accuracy is greatly affected by human factors, especially in large-sized sections, where the cumulative error is significant; fourth, the measurement efficiency is low, usually requiring 2-3 experienced technicians to spend 1-2 hours to complete the measurement of one area; fifth, existing measuring tools are difficult to adapt to complex on-site environmental conditions, such as limited space and insufficient lighting.

[0004] With the increasing size of ships and the ever-increasing precision requirements, especially the stringent requirements for the flatness of the hatch area of ​​container ships, developing a special tooling and method that can quickly and accurately measure the flatness of the hatch bulkhead and inner longitudinal bulkhead has become an urgent technical problem for shipyards. Summary of the Invention

[0005] In view of this, the present invention provides an apparatus and method for measuring the flatness of the joint of thick plates in container ships. The present invention can solve the problems of difficulty, low accuracy and poor efficiency in measuring the flatness of hatch coamings and inner longitudinal walls during the sectional assembly stage, and realize the simultaneous measurement of the flatness deviation of plates at different positions, providing accurate data support for sectional correction.

[0006] A device for measuring the flatness of the butt joint of thick plates in a container ship includes a fixing assembly for securing the entire device to the edge of a section, horizontally extendable telescopic rods disposed on both sides of the fixing assembly, and a measuring assembly disposed at the ends of the two telescopic rods. The fixed component is connected to the telescopic rod via a transmission component to extend or shorten the telescopic rod to adjust the measuring span. The measuring assembly includes a measuring clamp frame for clamping onto the plate. A first measuring fixing tube and a second measuring fixing tube are fixed at the center of the top and bottom inner sides of the measuring clamp frame, respectively. A first spring is installed inside the first measuring fixing tube, and a second spring is installed inside the second measuring fixing tube. Ball bearings are fixed to the lower end of the first spring and the upper end of the second spring. The upper end of the first spring and the lower end of the second spring are both fixed to the measuring clamp frame. A measuring post, passing through the first spring and connected to the ball bearings, is provided through the top of the measuring clamp frame. In the initial state, the first spring is under tension under the weight of its corresponding ball, while the second spring is in a free extension state and a portion of its ball extends out from its measuring fixing tube.

[0007] Preferably, the fixing component includes a fixing frame and a slide rod disposed on the back of the fixing frame. The front of the fixing frame is provided with a clamping groove that matches the shape of the segmented edge. A slide groove is longitudinally opened on the back of the fixing frame. A part of the slide rod is slidably engaged in the slide groove. The slide rod is provided with multiple positioning holes and is connected to the transmission component.

[0008] Preferably, the transmission assembly includes a connecting shaft and two connecting rods. The connecting shaft is vertically fixed on the slide rod, and the two connecting rods are both obliquely upward. One end of each connecting rod is connected to the connecting shaft, and the other end of each connecting rod is connected to its corresponding telescopic rod via a pin. The end of the telescopic rod connected to the connecting rod is also fixed to the fixed clamping frame, and the other end is fixed to the measuring clamping frame.

[0009] Preferably, the telescopic rod is a scissor-type telescopic rod.

[0010] Preferably, the slide bar is a T-shaped slide bar, which is a cross-shaped groove on the clamping frame.

[0011] A method for measuring the flatness of the butt joint of thick plates in a container ship using the aforementioned device specifically includes the following steps: S1, the fixing component of the device is snapped into the segmented edge, so that the clamping groove of its fixing frame is snapped into the joint between the main deck and the hatch bulkhead and the inner longitudinal bulkhead. S2, the measuring clamps of the left and right measuring components are respectively clamped onto the hatch bulkhead and the inner longitudinal bulkhead. At this time, the upper and lower balls of the two measuring components are in contact with the upper and lower surfaces of their corresponding plates. S3. Slowly pull the slide bar. The slide bar drives the telescopic rod to extend or shorten to move the two measuring components to a certain span position. Read the readings displayed by the measuring columns of the two measuring components at the current span position. The difference between the two readings is the flatness deviation at the current span position. S4. Repeat step S3 to obtain the flatness deviation at different span positions. S5. Based on the flatness deviation data at different span positions and the readings of the left and right measuring columns, determine the flatness correction scheme so that the hatch bulkhead and the inner longitudinal bulkhead are on the same horizontal plane.

[0012] Preferably, in step S3, after the slide rod drives the telescopic rod to extend or shorten and moves the left and right measuring components to a certain span position, a positioning pin is inserted into the positioning hole of the slide rod to fix the slide rod at the current height position.

[0013] The beneficial effects of this invention are: 1. This invention uses a fixing component to secure the segment opening, and two sets of measuring components to secure the left and right sides of the hatch coaming and inner longitudinal wall, respectively. By pulling the sliding rod of the fixing component, the telescopic rod is extended or shortened to adjust the position of the measuring components, thereby quickly measuring the flatness deviation at different span positions. This enables rapid and synchronous measurement of the flatness of the hatch coaming and inner longitudinal wall of container ships, simplifying the complex process that traditionally required multiple positioning and calculations into an intuitive scale reading, greatly improving measurement efficiency. Furthermore, the time for a single measurement is reduced from 30-60 minutes to less than 10 minutes, increasing efficiency by more than 70%.

[0014] 2. The measuring column on the measuring component of the present invention is set with millimeter-level scale, which can make the measurement accuracy as accurate as ±0.5mm, far higher than the measurement accuracy of ±2mm of the traditional method. This significantly improves the flatness measurement accuracy and also reduces the dependence on the skill level of the operator. Ordinary workers can master the measurement method after simple training.

[0015] 3. This invention can simultaneously acquire flatness data under different spans, providing a more comprehensive basis for segmented correction; moreover, the structure is simple and stable, adaptable to complex on-site environments, and has broad application value. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the invention being installed on the segmented edge.

[0018] Figure 2 This is a schematic diagram of the structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the measurement component.

[0020] The meanings of the labels in the diagram are as follows: 1 is a fixed component, 11 is a fixed clamping frame, 12 is a sliding rod, 13 is a connecting shaft, and 14 is a connecting rod. 2 is a telescopic pole. 3 is the measuring component, 31 is the measuring column, 32 is the measuring clamping frame, 33 is the first measuring fixing tube, 34 is the ball bearing, 35 is the second measuring fixing tube, 36 is the first spring, and 37 is the second spring. 4 is the inner longitudinal wall panel. 5 is the main deck. 6 represents the hatch bulkhead. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0022] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0023] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0024] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0026] The present invention provides a device for measuring the flatness of the joint of thick plates of container ships, including a fixing component 1, horizontally extendable telescopic rods 2 disposed on both sides of the fixing component 1, and a measuring component 3 disposed at the ends of the two telescopic rods.

[0027] Specifically, the fixing component 1 is used to fix the entire device at the segmented edge. The fixing component 1 includes a fixing frame 11 and a slide rod 12 disposed on the back of the fixing frame 11. The front of the fixing frame 11 is provided with a clamping groove that matches the shape of the segmented edge. The back of the fixing frame 11 is longitudinally provided with a slide groove. A part of the slide rod 12 is slidably engaged in the slide groove. The slide rod 12 is provided with multiple positioning holes and is connected to the transmission component.

[0028] In this embodiment, since the junction of the main deck 5 with the hatch cofferdam 6 and the inner longitudinal bulkhead 4 is cross-shaped, the fixing frame 11 is designed as a cross-shaped frame, and a cross-shaped U-shaped clamping groove is opened on the fixing frame 11 so that the fixing frame 11 can be precisely locked at the cross junction of the main deck 5 with the hatch cofferdam 6 and the inner longitudinal bulkhead 4, that is, the vertical groove of the clamping groove locks the main deck 5, and the horizontal groove locks the hatch cofferdam 6 and the inner longitudinal bulkhead 4. A Y-shaped sliding groove is longitudinally opened on the back of the fixing frame 11, and a protrusion extends from the front of the sliding rod 12, which is locked in the Y-shaped sliding groove.

[0029] In this embodiment, the fixed clamping frame 11 is made of high-strength aluminum alloy. The vertical groove of the clamping slot is 15mm wide and 40mm deep, and the horizontal groove of the clamping slot is 15mm wide and 30mm deep. The opening width of the sliding groove on its back is 20mm, the internal width is 18mm, and the groove depth is 35mm. The sliding rod 12 is made of stainless steel and is T-shaped. Its top horizontal bar is 120mm long and 15mm in diameter for easy hand gripping and operation. Its vertical bar is 200mm long and 15mm in diameter, and the protrusion extending from the vertical bar is engaged in the sliding groove of the fixed clamping frame 11.

[0030] The slide bar 12 is connected to the left and right telescopic rods 2 through a transmission assembly to drive the left and right telescopic rods 2 to extend or shorten synchronously to adjust the measuring span.

[0031] The transmission assembly includes a connecting shaft 13 and two connecting rods 14. The connecting shaft 13 is vertically fixed on the slide rod 12. Both connecting rods 14 are obliquely upward. One end of each connecting rod 14 is connected to the connecting shaft 13. The other end of each connecting rod 14 is connected to its corresponding telescopic rod 2 via a pin. The end of the telescopic rod connected to the connecting rod 14 is also fixed to the fixed clamping frame 11, and the other end is fixed to the measuring clamping frame 32.

[0032] When the slide rod 12 slides along the slide groove of the fixed clamp frame 11, since both the left and right connecting rods 14 are connected to the connecting shaft 13 on the slide rod 12, the two connecting rods 14 will rotate around the connecting shaft 13. Since the connecting rod 14 is hinged to the end of the telescopic rod through the pin, the rotation of the connecting rod 14 will cause the telescopic rod 2 to rotate, thereby causing the telescopic rod 2 to extend or shorten.

[0033] The telescopic pole is a scissor-type telescopic pole, which consists of multiple poles that intersect at the center point through pins. The two ends of each "X"-shaped intersecting pole unit are connected to other poles through pins, thus forming a linked grid unit.

[0034] In this embodiment, the telescopic rod consists of eight intersecting "X"-shaped rod units, each made of high-strength aluminum alloy and composed of two rods each 150mm long. When the slide rod 12 moves upward, the telescopic rod 2 extends, thereby increasing the measurement span of the two measuring components 3; when the slide rod 12 moves downward, the telescopic rod 2 shortens, thereby decreasing the measurement span of the two measuring components 3. When the telescopic rod 2 is extended to its longest length, the measurement span is at its maximum, reaching 1500mm; when the telescopic rod 2 is retracted to its shortest length, the measurement span is at its minimum, 300mm, so that the device can adapt to the measurement needs of different sized segments.

[0035] The left and right sets of measuring components 3 work together to measure the flatness between the hatch bulkhead 6 and the inner longitudinal bulkhead 4. The measuring component 3 includes a measuring clamping frame 32 for clamping onto the plate. A first measuring fixing tube 33 and a second measuring fixing tube 35 are respectively fixed at the center of the top inner side and the bottom inner side of the measuring clamping frame 32. A first spring 36 is installed in the first measuring fixing tube 33, and a second spring 37 is installed in the second measuring fixing tube 35. Ball bearings 34 are fixed to the lower end of the first spring 36 and the upper end of the second spring 37. The upper end of the first spring 36 and the lower end of the second spring 37 are fixed to the measuring clamping frame 32. A measuring column 31 is provided through the top of the measuring clamping frame 32, passing through the first spring 36 and connected to the ball bearing.

[0036] The function of the first measuring fixing tube 33 and the second measuring fixing tube 35 is to constrain the spring within their tubes to ensure that the spring is stably compressed or stretched in the up and down directions.

[0037] When the device is not installed in the initial state at the segmented edge, the first spring 36 is in a stretched state under the weight of its corresponding ball, but the second spring 37 is in a free-stretched state and a part of its ball extends out from its measuring fixing tube.

[0038] When the fixing component is locked at the segment edge and the measuring clamp 32 is locked onto the edge of the hatch bulkhead 6 or the inner longitudinal wall 4, the upper and lower balls first contact the upper and lower surfaces of the hatch bulkhead 6 or the inner longitudinal wall 4. As the pressure increases, the first spring 36 and the second spring 37 are compressed, so that the measuring clamp 32 firmly holds the plate. At the same time, the measuring column 31 extends upward from the top of the measuring clamp 32 by 5-10mm to read the scale during subsequent measurements.

[0039] To facilitate reading the scale, the scale displayed on the measuring column 31 is set to 0 when the measuring clamp 32 is clamped on the hatch bulkhead 6 or the inner longitudinal bulkhead 4 at the minimum measuring span.

[0040] To ensure measurement accuracy, millimeter-level graduations are set on the measuring column 31.

[0041] In this embodiment, the measuring clamp 32 is a U-shaped frame made of stainless steel. The width of its U-shaped groove is 20mm and the depth is 35mm, which can accommodate plates with a thickness of 10-18mm. A 15mm through-hole is provided at the top of the measuring clamp 32 for installing the measuring column 31. Two pins are fixed on the back of the measuring clamp 32 for connecting with the rod of the telescopic rod. The first spring 36 and the second spring 37 in the measuring clamp 32 have the same elastic force, both 50N, but the weight of the ball installed on the first spring 36 is greater than the weight of the ball installed on the second spring 37. Both the upper and lower balls are made of bearing steel.

[0042] The present invention also provides a method for measuring the flatness of the butt joint of thick plates of a container ship using the above-described device, specifically including the following steps: S1, the fixing component of the device is snapped into the segmented edge, so that the clamping groove of the fixing frame 11 is snapped into the joint between the main deck 5 and the hatch bulkhead 6 and the inner longitudinal bulkhead 4.

[0043] S2, the measuring clamps 32 of the left and right measuring components are respectively clamped onto the hatch bulkhead 6 and the inner longitudinal bulkhead 4. At this time, the upper and lower balls of the two measuring components are in contact with the upper and lower surfaces of their corresponding plates, and the scales displayed by the measuring columns 31 of the two measuring components are both 0.

[0044] S3, slowly pull the slide bar 12. The slide bar 12 drives the telescopic rod 2 to extend or shorten to move the two measuring components to a certain span position. Then, insert the positioning pin into the positioning hole of the slide bar 12 to fix the slide bar 12 at the current height position. Then, read the readings displayed by the measuring column 31 of the two measuring components at the current span position. The difference between the two readings is the flatness deviation at the current span position.

[0045] S4. Repeat step S3 to obtain the flatness deviation at different span positions.

[0046] S5. Based on the flatness deviation data at different span positions and the readings of the two measuring columns 31 on the left and right, determine the flatness correction scheme so that the hatch bulkhead 6 and the inner longitudinal bulkhead 4 are on the same horizontal plane.

[0047] The following section uses a hull section of a 14,000 TEU container ship as an example to illustrate in detail the method of measuring the flatness of the joint of thick plates of a container ship using the device described above.

[0048] During the large-scale assembly of the side sections of a certain type of 14,000 TEU container ship, after the section construction is completed, it is necessary to check the flatness between the hatch coaming 6 and the inner longitudinal bulkhead 4, that is, to check whether the hatch coaming 6 and the inner longitudinal bulkhead 4 are on the same horizontal plane.

[0049] First, the operator inserts the fixed clamping frame 11 into the section edge, so that the vertical groove of its clamping slot is locked onto the main deck 5, and the horizontal groove is locked onto the hatch bulkhead 6 and the inner longitudinal bulkhead 4, ensuring that the tooling is stable as a whole.

[0050] Then, the measuring clamps 32 of the left and right sets of measuring components 3 are respectively inserted into the edges of the hatch bulkhead 6 and the inner longitudinal wall 4 at the required measuring positions, and the upper and lower balls 34 of the two sets of measuring components are made to fully contact the surface of the plate.

[0051] Next, the operator holds the top of the slide bar 12 and slowly pulls it upwards to gradually unfold the telescopic bar 2. The two measuring clamps 32 are adjusted to a position 0.5m away from the main deck 5. The positioning pin is inserted into the positioning hole of the slide bar 12 to fix the slide bar 12. Then, the scale values ​​of the left and right measuring columns 31 are read and recorded. For example, the reading on the hatch bulkhead 6 side is +1.5mm, and the reading on the inner longitudinal bulkhead 4 side is -0.8mm. The flatness deviation is calculated to be 2.3mm.

[0052] Then, pull out the positioning pin, continue to pull the slide bar 12 upwards, adjust the measuring end 3 to a position 1.0m away from the main deck 5, fix the slide bar 12 again and record the scale values ​​of the left and right measuring columns 31.

[0053] Repeat the above steps to measure the data at a position 1.5m away from the main deck using the same method.

[0054] After recording all measurement data, reset slide bar 12 to its lowest position and remove the tooling from the section edge. Based on all recorded data, analyze the flatness of the mating between hatch bulkhead 6 and inner longitudinal bulkhead 4, and determine the correction scheme.

[0055] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A device for measuring the flatness of the butt joint of thick plates in container ships, characterized in that, It includes a fixing component (1) for fixing the entire device at the segment edge, horizontally telescopic rods (2) set on both sides of the fixing component (1), and a measuring component (3) set at the ends of the two telescopic rods. The fixed component (1) is connected to the telescopic rod (2) through the transmission component to drive the telescopic rod (2) to extend or shorten to adjust the measuring span; The measuring assembly (3) includes a measuring clamp (32) for clamping onto the plate. A first measuring fixing tube (33) and a second measuring fixing tube (35) are fixed at the center of the inner top and inner bottom of the measuring clamp (32), respectively. A first spring (36) is provided inside the first measuring fixing tube (33), and a second spring (37) is provided inside the second measuring fixing tube (35). A ball bearing (34) is fixed at the lower end of the first spring (36) and the upper end of the second spring (37). The upper end of the first spring (36) and the lower end of the second spring (37) are fixed on the measuring clamp (32). A measuring column (31) that passes through the first spring (36) and is connected to the ball bearing is provided through the top of the measuring clamp (32). In the initial state, the first spring (36) is in a stretched state under the weight of its corresponding ball, but the second spring (37) is in a free-stretched state and a part of its ball extends out from its measuring fixed tube.

2. The device for measuring the flatness of the butt joint of thick plates in container ships according to claim 1, characterized in that, The fixing component (1) includes a fixing frame (11) and a slide rod (12) disposed on the back of the fixing frame (11). The front of the fixing frame (11) is provided with a clamping groove that matches the shape of the segmented edge. A slide groove is longitudinally opened on the back of the fixing frame (11). A part of the slide rod (12) is slidably locked in the slide groove. The slide rod (12) is provided with multiple positioning holes. The slide rod (12) is connected to the transmission component.

3. The device for measuring the flatness of the butt joint of thick plates in container ships according to claim 2, characterized in that, The transmission assembly includes a connecting shaft (13) and two connecting rods (14). The connecting shaft (13) is vertically fixed on the slide rod (12). The two connecting rods (14) are both set obliquely upward. One end of each connecting rod (14) is connected to the connecting shaft (13). The other end of each connecting rod (14) is connected to its corresponding telescopic rod (2) through a pin. The end of the telescopic rod connected to the connecting rod (14) is also fixed to the fixed clamping frame (11), and the other end is fixed to the measuring clamping frame (32).

4. The apparatus for measuring the flatness of the butt joint of thick plates in a container ship according to claim 1 or 3, characterized in that, The telescopic pole is a scissor-type telescopic pole.

5. The apparatus for measuring the flatness of the butt joint of thick plates in container ships according to claim 2, characterized in that, The slide bar (12) is a T-shaped slide bar with a cross-shaped groove on the clamping frame (11).

6. A method for measuring the flatness of the butt joint of thick plates of a container ship using the apparatus according to any one of claims 1-5, characterized in that, Specifically, the following steps are included: S1, the fixing component of the device is clamped at the segment edge, so that the clamping groove of its fixing frame (11) is clamped at the joint between the main deck (5) and the hatch bulkhead (6) and the inner longitudinal bulkhead (4); S2, the measuring clamps (32) of the left and right measuring components are respectively clamped on the hatch bulkhead (6) and the inner longitudinal wall (4). At this time, the upper and lower balls of the two measuring components are in contact with the upper and lower surfaces of their corresponding plates. S3, slowly pull the slide bar (12), the slide bar (12) drives the telescopic bar (2) to extend or shorten to move the two measuring components to a certain span position, and read the readings displayed by the measuring column (31) of the two measuring components at the current span position. The reading deviation between the two is the flatness deviation of the current span position. S4. Repeat step S3 to obtain the flatness deviation at different span positions. S5. Based on the flatness deviation data at different span positions and the readings of the two measuring columns (31) on the left and right, determine the flatness correction scheme so that the hatch bulkhead (6) and the inner longitudinal bulkhead (4) are on the same horizontal plane.

7. The method according to claim 6, characterized in that, In step S3, the slide rod (12) drives the telescopic rod (2) to extend or shorten, and after moving the two measuring components to a certain span position, a positioning pin is inserted into the positioning hole of the slide rod (12) to fix the slide rod (12) at the current height position.

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