Method, equipment and medium for marking baselines on vertical membrane tanks

Abstract

The present invention relates to a method, device, and medium for marking a baseline on a vertical film tank, comprising: placing a laser level at the center of the bottom circle of the vertical film tank, adjusting the vertical laser emitted by the laser level to coincide with the initial angle between the tank wall; initially setting a circle of corner points on the bottom and a circle of corner points on the top, and using the laser level to collect corner point data; establishing a Cartesian coordinate system based on the collected corner point data, fixing the coordinates of any corner point on the bottom, and adjusting the coordinates of the remaining corner points on the bottom by setting a constraint sequence; wherein the set constraints include the line connecting two adjacent corner points on the bottom being perpendicular to the line connecting the marked point and the center of the circle, the cumulative offset of the center lines of adjacent tank walls in the plane of the vertical angle bisector being less than a set threshold, and the distance between the center of the tank bottom and the line connecting the current wall mark point and the opposite wall mark point being less than a set threshold; and using the adjusted corner point coordinates to mark the baseline. Compared with existing technologies, the present invention has the advantages of high efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of film tank baseline marking, and in particular to a vertical film tank baseline marking method, equipment and medium. Background Art

[0002] As a core facility for liquefied natural gas (LNG) storage, vertical membrane tanks are widely used in energy storage projects due to their efficient space utilization, manageable construction costs, and long service life. The internal tank system within a vertical membrane tank places extremely high demands on the precise delineation of the baseline, as the accuracy of this baseline is directly related to the overall performance and safe operation of the tank.

[0003] The vertical membrane tank has a complex structure, consisting of multiple layers of tank walls and a large area of ​​tank bottom. The tank bottom is usually divided into multiple functional sectors. During the construction process, the corrugated plates of the tank wall must be strictly aligned in a ring with the corrugated plates of the corresponding sectors of the tank bottom and the corrugated plates relative to the tank wall in the vertical and horizontal directions to ensure the integrity and sealing of the tank structure. The precise installation of the corrugated plates depends on the positioning of the insulating modules below, and the installation of the insulating modules is based on the baseline as a key reference. Once the baseline deviates, it will not only cause the corrugated plates to be installed misaligned, destroying the sealing system of the tank and increasing the risk of liquefied natural gas leakage, but it may also cause stress concentration, affecting the structural strength of the tank and reducing the service life and safety factor of the tank.

[0004] After searching, Chinese invention patent application CN115265503A discloses a method for marking the baseline of a membrane tank. The method establishes a theoretical model of a membrane tank within a tank through POLYWORKS software, and marks information on the built membrane tank within a tank. The actual model of the membrane tank within a tank is established by measuring the measurement points on the tank wall. The actual model and the theoretical model are fitted and the baseline of the membrane tank wall and tank bottom is marked. Finally, the baseline of the tank wall and tank bottom is inspected.

[0005] However, the above technology relies on POLYWORKS software to complete the fitting of the actual model and the theoretical model. When the fitting result does not meet the baseline test, re-measurement and fitting are required, which greatly affects the marking efficiency. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a method, equipment and medium for marking the baseline of a vertical film tank with high efficiency and high precision.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] According to a first aspect of the present invention, a method for marking a reference line on a vertical film tank is provided, comprising:

[0009] Place the laser level at the center of the bottom circle of the vertical film tank, and adjust the vertical laser emitted by the laser level to coincide with the initial angle line of the tank wall;

[0010] Initially set a circle of corner points at the bottom and a circle of corner points at the top, and use a laser level to collect corner point data;

[0011] A Cartesian coordinate system is established based on the collected corner point data. The coordinates of any corner point on the bottom are fixed, and the coordinates of the remaining corner points on the bottom are adjusted by setting a constraint sequence. The set constraints include that the line connecting two adjacent corner points on the bottom is perpendicular to the line connecting the marked point and the center of the circle, the cumulative offset of the center lines of adjacent tank walls in the vertical angle bisector plane is less than a set threshold, and the distance between the center of the tank bottom circle and the line connecting the current wall mark point and the opposite wall mark point is less than a set threshold.

[0012] Use the adjusted corner point coordinates to draw the baseline.

[0013] Preferably, the laser level is placed at the center of the bottom circle of the vertical film tank, and the laser emitted vertically by the laser level is adjusted to coincide with the initial angle line of the tank wall. Specifically, the geometric center of the bottom surface of the vertical film tank is used as the center of the tank bottom circle, and the laser level is placed so that the laser spot at the bottom of the laser level coincides with the center of the tank bottom circle, and the laser emitted vertically by the laser level is adjusted to coincide with the initial angle line of the tank wall.

[0014] Preferably, the initial setting of a circle of corner points at the bottom specifically includes:

[0015] For each initial tank wall angle line, mark a first marking point and a second marking point at a first distance and a second distance upward from the tank bottom, respectively, and connect the first marking point and the second marking point to obtain the wall angle line;

[0016] For each wall angle line, mark two third marking points on the left and right walls at a third distance upward from the tank bottom. The vertical intersection of the line connecting the two third marking points at the corresponding wall angle line is used as the corner point; the value of the third distance is between the first distance and the second distance;

[0017] A laser level is used to collect corner point data around the bottom of the tank wall.

[0018] Preferably, for each wall angle line, two third marking points are marked on the left and right walls at the third distance upward from the bottom of the tank, respectively. Specifically, for each wall angle line, a right-angle mold is used to fit one right-angle side to the bottom of the tank, and the other right-angle side is fit to the left and right walls, respectively, and two third marking points are marked on the left and right walls at the third distance upward from the bottom of the tank, respectively.

[0019] Preferably, the coordinates of any corner point of the fixed bottom are adjusted by setting a constraint sequence, specifically:

[0020] For the M corner points in the bottom circle, fix the coordinates of any corner point, record it as P1, and mark the other corner points of the bottom in sequence to obtain the corner point set {P1, P1, …, PM};

[0021] With corner point P1 as the fixed point, if the set constraints are not met, the coordinates of corner point P2 are adjusted until the set constraints are met. Otherwise, with corner point P2 as the fixed point, the coordinates of corner point P3 are determined and adjusted.

[0022] The process loops through the process for one cycle. If the adjustment satisfies the set constraints, the adjusted corner point coordinates are output for subsequent baseline drawing. Otherwise, the process is interrupted and an abnormal output is given.

[0023] Preferably, the cumulative offset of the adjacent tank wall midlines in the vertical angle bisector plane is less than a set threshold, specifically:

[0024] The vertical plane where the vertical angle bisector is located is the vertical angle bisector plane;

[0025] Set wall width , according to the left and right offset angle of the current wall centerline on the vertical angle bisector plane , calculate the horizontal centerline offset distance of the wall as , according to the left and right offset angle of the next adjacent wall midline on the vertical angle bisector plane: , calculate the offset distance of the horizontal centerline of adjacent walls as ;

[0026] When the left and right offset angle and When they are in the same direction, the offset accumulation constraint is: ;

[0027] When the left and right offset angle and When the directions are different, the offset accumulation constraint is: ;

[0028] in, Set the horizontal axis tilt tolerance threshold.

[0029] Preferably, the distance between the center of the tank bottom circle and the line connecting the current wall marking point and the opposite wall marking point is less than a set threshold, specifically: the distance between the center of the tank bottom circle and the line connecting the current wall marking point and the opposite wall marking point is less than 1 mm.

[0030] Preferably, frog jump points are randomly arranged on the inner wall of the vertical film tank to ensure the consistency of the installation position of the laser tracker.

[0031] According to a second aspect of the present invention, an electronic device is provided, comprising a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the program, any one of the methods described above is implemented.

[0032] According to a third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, any one of the methods described above is implemented.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The present invention does not need to establish a theoretical model in advance. It is directly based on actual measurement data and, according to the actual requirements of the project, takes the line connecting two adjacent corner points as perpendicular to the line connecting the mark point and the center of the circle, the cumulative offset of the center line of the adjacent tank wall in the vertical angle bisector plane is less than the set threshold, and the distance between the center of the tank bottom circle and the line connecting the current wall mark point and the opposite wall mark point is less than the set threshold as the constraint conditions. The corner point positions are adjusted quickly and accurately in sequence, and the baseline can be drawn according to the corner point settings, which is more efficient and reliable. Moreover, only one corner point coordinate needs to be adjusted for each constraint judgment, and the calculation amount for a single adjustment is smaller, which is more convenient for on-site operation.

[0035] (2) By marking two points at a set distance from the bottom of the tank, the wall angle line is obtained by connecting them. Then, two points are marked on the left and right walls at a set distance from the bottom of the tank. The longitudinal intersection of the connecting lines is used as the initial corner point. The points and lines are interconnected to build a plane constraint, and the on-site operation is precise and controllable.

[0036] (3) During the process of adjusting the corner coordinates, the adjacent wall centerline offset constraint is introduced. The sine function is used to map the centerline offset angle and the centerline offset amount, so that the offset of the wall centerline in the vertical angle bisector plane can be quickly calculated. At the same time, different offset cumulative expressions are selected according to the similarities and differences in the offset directions of adjacent walls. The adjacent wall constraints are applied sequentially to realize multi-level offset error transmission, thereby improving the accuracy of the overall adjustment of the corner coordinates.

[0037] (4) Under the constraints of adjacent walls, additional constraints of the current wall and the opposite wall are introduced during the corner point coordinate adjustment process, ensuring the high reliability and accuracy of the overall corner point coordinate adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Flow chart of the method of the present invention.

[0039] Figure 2 Schematic diagram of the wall corner points.

[0040] Figure 3This is a schematic diagram of the bottom angle line.

[0041] Figure 4 Schematic diagram for right-angle template placement.

[0042] Figure 5 Schematic diagram of corner point locations.

[0043] Figure 6 Schematic diagram of the location of the frog jumping point.

[0044] Figure 7 Schematic diagram of collecting bottom corner points for the laser tracker.

[0045] Figure 8 Schematic diagram of the top marking point location.

[0046] Figure 9 Schematic diagram of the top corner point position.

[0047] Figure 10 Schematic diagram of wall centerline offset calculation.

[0048] Figure 11 A locally enlarged schematic diagram of the wall centerline offset calculation.

[0049] Figure 12 This is a schematic diagram of the angle line point marking. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0051] Example

[0052] like Figure 1 As shown, this embodiment provides a method for marking a reference line of a vertical film tank, the method comprising:

[0053] S1. Place the laser level at the center of the bottom circle of the vertical film tank, and adjust the vertical laser emitted by the laser level to coincide with the initial angle line of the tank wall;

[0054] S2. Initially set the bottom circle of corner points and the top circle of corner points, and use a laser level to collect corner point data;

[0055] S3. Establish a Cartesian coordinate system based on the collected corner point data, fix the coordinates of any corner point on the bottom, and adjust the coordinates of the remaining corner points on the bottom by setting constraints in sequence; wherein the set constraints include that the line connecting two adjacent corner points on the bottom is perpendicular to the line connecting the marked point and the center of the circle, the cumulative offset of the center lines of adjacent tank walls in the vertical angle bisector plane is less than a set threshold, and the distance between the center of the tank bottom circle and the line connecting the current wall marked point and the opposite wall marked point is less than a set threshold;

[0056] S4. Use the adjusted corner point coordinates to draw the baseline.

[0057] Next, the method of this embodiment is introduced in detail.

[0058] First, the definitions of terms involved in this embodiment are given:

[0059] Tank bottom circle and tank top center: The geometric center of the tank bottom is taken as the tank bottom circle center, and the point at the height of the tank top plane vertically above the tank bottom circle center is taken as the tank top circle center.

[0060] Markout point: Starting from the center of the tank bottom and the center of the tank top, draw a perpendicular line to the bottom and top edges of the tank according to the angle bisector of the regular polyhedron. The intersection point is called the markout point (Note: for regular polygons, the markout point coincides with the midpoint of the edge);

[0061] Centerline of tank wall: The line connecting the markout points of the upper and lower sides of a wall is called the centerline of the tank wall.

[0062] S1. Place the laser level at the center of the bottom circle of the vertical film tank, and adjust the vertical laser emitted by the laser level to coincide with the initial angle line of the tank wall.

[0063] Specifically, the geometric center of the bottom surface of the vertical film tank is used as the center of the tank bottom circle, and a laser level is placed so that the laser spot at the bottom of the laser level coincides with the center of the tank bottom circle, and the laser emitted vertically by the laser level is adjusted to coincide with the initial angle line of the tank wall.

[0064] S2. Initially set a circle of corner points at the bottom and a circle of corner points at the top, and use a laser level to collect corner point data.

[0065] Initially set the bottom circle of corner points, including:

[0066] S201. Angle line marking: For each initial tank wall angle line, mark a first marking point and a second marking point at a first distance and a second distance upward from the tank bottom, respectively. Connect the first marking point and the second marking point to obtain the wall angle line. In this embodiment, adjust the laser level so that the vertical laser emitted by the laser coincides with the initial tank wall angle line, and then use a marker to draw two marking points at about 100 mm and 300 mm upward from the tank bottom, such as Figure 2 Use the ink fountain to connect the upper and lower adjacent angle points with a line, as shown. Figure 3 As shown, complete all the angle lines at the bottom of the entire tank wall in the same way.

[0067] S202, corner point marking: For each wall angle line, for each wall angle line, use a right angle mold, such as Figure 4 As shown, one right-angled side is aligned with the bottom of the tank, and the other right-angled side is aligned with the left and right walls respectively. Two third marking points are marked on the left and right walls at a third distance upward from the bottom of the tank. Use an ink fountain to mark the vertical intersection of the connecting line of the two third marking points at the corresponding wall angle line as the corner point, as shown in the figure below. Figure 5 As shown, wherein the value of the third distance is between the first distance and the second distance. In this embodiment, the third distance ranges from 100 to 200 mm.

[0068] S203. Use a laser level to collect corner point data around the bottom of the tank wall.

[0069] In the same manner as for the tank wall bottom, mark corner points on each initial wall angle line at a set distance below the tank top plane.

[0070] In this embodiment, frog jump points are randomly set on the inner wall of the vertical film tank to ensure the consistency of the laser tracker installation position when the initial installation position of the laser tracker is offset or the error is corrected multiple times. Figure 6 The specific installation process of the frog jump point is as follows: first clean the installation target base, press the target base against the tank wall, and then use hot melt glue to apply glue around the target base to ensure that the target base is firmly attached.

[0071] In this embodiment, the laser tracker is mounted securely and placed around it with visible protective objects to prevent external impacts and displacement of the laser tracker during operation. The mounting method (magnetic or tripod support) is determined based on the actual site environment or location.

[0072] Use a laser level to collect corner point data, including:

[0073] S211. Measure bottom data: Install the laser tracker on the bottom of the tank. One person holds the target base and the target ball and aligns them with the corner points. Use the laser tracker to collect a circle of corner points on the bottom of the tank wall. Figure 7 As shown, the data of a circle at the bottom of the tank is obtained and a Cartesian coordinate system is established.

[0074] S212, measure the top data: use the laser tracker and target ball to mark and measure the top position according to the design size, Figure 8 Use the ink fountain to connect the horizontal and vertical marking points, and generate an intersection point between each two adjacent faces, as shown in the figure below. Figure 9 shown.

[0075] S3. Establish a Cartesian coordinate system based on the collected corner point data, fix the coordinates of any corner point on the bottom, and adjust the coordinates of the remaining corner points on the bottom by setting a constraint sequence; wherein the set constraints include that the line connecting two adjacent corner points on the bottom is perpendicular to the center line of the tank wall, the cumulative offset of the center lines of adjacent tank walls in the vertical angle bisector plane is less than a set threshold, and the distance between the center point of the tank bottom and the line connecting the current wall mark point and the opposite wall mark point is less than a set threshold.

[0076] The adjustment process logic is as follows:

[0077] 1) For the M corner points in the bottom circle, fix the coordinates of any corner point, record it as P1, and mark the other corner points in sequence to obtain the corner point set {P1, P1, …, PM};

[0078] 2) With corner point P1 as the fixed point, if the set constraints are not met, the coordinates of corner point P2 are adjusted until the set constraints are met. Otherwise, with corner point P2 as the fixed point, the coordinates of corner point P3 are determined and adjusted;

[0079] 3) The process loops through the loop once. If the adjustment satisfies the set constraints, the adjusted corner point coordinates are output for subsequent baseline drawing. Otherwise, the process is interrupted and an abnormal output is given.

[0080] The constraints set for the adjustment process include:

[0081] Constraint 1: The line connecting two adjacent corner points at the bottom (bottom edge of the tank wall) is perpendicular to the centerline of the tank wall.

[0082] Constraint 2: Constrain the cumulative offset of the center lines of adjacent tank walls in the vertical angle bisector plane to be less than the set threshold:

[0083] The vertical plane where the vertical angle bisector emitted by the laser level is located is the vertical angle plane;

[0084] like Figure 10 and Figure 11 As shown, set the wall width , according to the left and right offset angle of the current wall centerline on the vertical angle bisector plane , calculate the horizontal centerline offset distance of the wall as , according to the left and right offset angle of the next adjacent wall midline on the vertical angle bisector plane: , calculate the offset distance of the horizontal centerline of adjacent walls as ; When the left and right offset angles and When they are in the same direction, the offset accumulation constraint is: ; When the left and right offset angles and When the directions are different, the offset accumulation constraint is: ;in, is the set horizontal axis tilt tolerance threshold. In this embodiment, the horizontal axis tilt tolerance threshold is Set to 4mm. Figure 11 In the figure, A is the tilt tolerance of the horizontal axis.

[0085] Constraint 3: The distance between the center of the tank bottom and the line connecting the current wall mark point and the opposite wall mark point is less than a set threshold. In this embodiment, the threshold is 1 mm.

[0086] S4. According to the adjusted corner point coordinates, new tank wall corner points, tank wall corner lines and tank wall center lines are obtained, and reference lines are drawn.

[0087] Specifically, the calculated new corner points are marked at the coordinate positions in the form of points, and the distance between the two points is about 2 meters, such as Figure 12 As shown, draw the angle line and use the ink fountain to connect all the points longitudinally in sequence to form the final wall angle line. When adjusting, align the sharp corner of the right-angle mold with this line.

[0088] The electronic device of the present invention includes a central processing unit (CPU), which can perform various appropriate actions and processes according to computer program instructions stored in a read-only memory (ROM) or loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for device operation can also be stored. The CPU, ROM, and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0089] Many components in a device are connected to the I / O interface, including: input units, such as a keyboard and mouse; output units, such as various types of displays and speakers; storage units, such as magnetic disks and optical disks; and communication units, such as network cards, modems, and wireless communication transceivers. The communication unit allows the device to exchange information / data with other devices via computer networks such as the Internet and / or various telecommunication networks.

[0090] The processing unit performs the various methods and processes described above, such as methods S1 to S3. For example, in some embodiments, methods S1 to S3 can be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit. In some embodiments, part or all of the computer program can be loaded and / or installed on the device via a ROM and / or a communication unit. When the computer program is loaded into the RAM and executed by the CPU, one or more steps of the methods S1 to S3 described above can be performed. Alternatively, in other embodiments, the CPU can be configured to execute methods S1 to S3 by any other appropriate means (e.g., by means of firmware).

[0091] The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, and without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), and the like.

[0092] The program code for implementing the method of the present invention can be written in any combination of one or more programming languages. Such program code can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device so that when the program code is executed by the processor or controller, the functions / operations specified in the flow chart and / or block diagram are implemented. The program code can be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0093] In the context of the present invention, machine-readable medium can be a tangible medium that can contain or store a program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0094] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for marking a reference line on a vertical film tank, characterized in that: include: Place the laser level at the center of the bottom circle of the vertical film tank, and adjust the vertical laser emitted by the laser level to coincide with the initial angle line of the tank wall; Initially set a circle of corner points at the bottom and a circle of corner points at the top, and use a laser level to collect corner point data; A Cartesian coordinate system is established based on the collected corner point data. The coordinates of any corner point on the bottom are fixed, and the coordinates of the remaining corner points on the bottom are adjusted by setting a constraint sequence. The set constraints include that the line connecting two adjacent corner points on the bottom is perpendicular to the line connecting the marked point and the center of the circle, the cumulative offset of the center lines of adjacent tank walls in the vertical angle bisector plane is less than a set threshold, and the distance between the center of the tank bottom circle and the line connecting the current wall mark point and the opposite wall mark point is less than a set threshold. Use the adjusted corner point coordinates to draw the baseline; The cumulative offset of the adjacent tank wall midlines in the vertical angle bisector plane is less than a set threshold, specifically: The vertical plane where the vertical angle bisector is located is the vertical angle bisector plane; Set wall width , according to the left and right offset angle of the current wall centerline on the vertical angle bisector plane , calculate the horizontal centerline offset distance of the wall as , according to the left and right offset angle of the next adjacent wall midline on the vertical angle bisector plane: , calculate the offset distance of the horizontal centerline of adjacent walls as ; When the left and right offset angle and When they are in the same direction, the offset accumulation constraint is: ; When the left and right offset angle and When the directions are different, the offset accumulation constraint is: ; in, The horizontal axis tilt tolerance threshold is set; The distance between the center of the tank bottom circle and the line connecting the current wall mark point and the opposite wall mark point is less than a set threshold, specifically: the distance between the center of the tank bottom circle and the line connecting the current wall mark point and the opposite wall mark point is less than 1 mm.

2. A method for marking a reference line on a vertical film tank according to claim 1, characterized in that: The laser level is placed at the center of the bottom circle of the vertical film tank, and the laser emitted vertically by the laser level is adjusted to coincide with the initial angle line of the tank wall. Specifically, the geometric center of the bottom surface of the vertical film tank is used as the center of the tank bottom circle, and the laser level is placed so that the laser spot at the bottom of the laser level coincides with the center of the tank bottom circle, and the laser emitted vertically by the laser level is adjusted to coincide with the initial angle line of the tank wall.

3. A method for marking a reference line on a vertical film tank according to claim 1, characterized in that: The initial setting of the bottom circle of corner points specifically includes: For each initial tank wall angle line, mark a first marking point and a second marking point at a first distance and a second distance upward from the tank bottom, respectively, and connect the first marking point and the second marking point to obtain the wall angle line; For each wall angle line, mark two third marking points on the left and right walls at a third distance upward from the tank bottom. The vertical intersection of the line connecting the two third marking points at the corresponding wall angle line is used as the corner point; the value of the third distance is between the first distance and the second distance; A laser level is used to collect corner point data around the bottom of the tank wall.

4. A method for marking a reference line on a vertical film tank according to claim 3, characterized in that: For each wall angle line, two third marking points are marked on the left and right walls at the third distance upward from the bottom of the tank. Specifically, for each wall angle line, a right-angle mold is used to fit one right-angle side to the bottom of the tank, and the other right-angle side is fit to the left and right walls respectively, and two third marking points are marked on the left and right walls at the third distance upward from the bottom of the tank respectively.

5. A method for marking a reference line on a vertical film tank according to claim 1, characterized in that: The coordinates of any corner point of the fixed bottom are adjusted by setting the constraint sequence, specifically: For the M corner points in the bottom circle, fix the coordinates of any corner point, record it as P1, and mark the other corner points of the bottom in sequence to obtain the corner point set {P1, P1, …, PM}; With corner point P1 as the fixed point, if the set constraints are not met, the coordinates of corner point P2 are adjusted until the set constraints are met. Otherwise, with corner point P2 as the fixed point, the coordinates of corner point P3 are determined and adjusted. The process loops through the process for one cycle. If the adjustment satisfies the set constraints, the adjusted corner point coordinates are output for subsequent baseline drawing. Otherwise, the process is interrupted and an abnormal output is given.

6. A method for marking a reference line on a vertical film tank according to claim 1, characterized in that: Frog jump points are randomly arranged on the inner wall of the vertical film tank to ensure the consistency of the installation position of the laser tracker.

7. An electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor executes the program, the method according to any one of claims 1 to 6 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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