Method for centering ship propulsion motor and thrust bearing

Abstract

The invention relates to the technical field of optical indication measurement, in particular to a ship propulsion motor and thrust bearing centering method. A ship propulsion motor and thrust bearing centering method comprises the steps that a propulsion motor and a thrust bearing are placed in place, before a coupler is installed, a three-dimensional scanning tool is used for scanning a motor flange plate and a bearing flange plate, initial axes of the motor flange plate and the bearing flange plate are fitted according to the outer circle surfaces of the motor flange plate and the bearing flange plate, and a coordinate system is established; extending the respective initial axes to the same plane in the coordinate system, and judging the offset of the two axes; and then installing a coupler, scanning the motor flange plate and the bearing flange plate by using the three-dimensional scanning tool again, synchronizing the information into the coordinate system, fitting respective final axes according to respective outer circle surfaces, extending the respective final axes to the same plane in the coordinate system, and judging the offset of the two final axes. The problem that in the prior art, measurement cannot be effectively carried out under the condition that turning cannot be carried out is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical indication measurement, and particularly to a method for aligning a ship propulsion motor with a thrust bearing. Background Art

[0002] During the construction of an electric propulsion ship, the propulsion motor provides torque to the ship shafting, and the torque is converted into propulsion power through the propeller at the tail of the shafting. The thrust bearing can bear the axial thrust of the shafting and prevent the shaft and related components from axially moving. Generally, during installation, a motor flange is set on the propulsion motor, a bearing flange is installed on the thrust bearing, and a coupling is installed between the two flanges. The alignment degree between the propulsion motor and the thrust bearing is crucial for the operation of the power system, and alignment detection is required during installation.

[0003] In the prior art during detection, usually the method of installing a dummy shaft is adopted, that is, a dummy shaft is installed in the thrust bearing, and a dial indicator is used for measurement during the process of turning the shaft by hand, and it is judged whether the reading of the dial indicator changes during one revolution. The above method is time-consuming and laborious, has high requirements for personnel, and cannot be used in some scenarios where the shaft cannot be turned by hand. Summary of the Invention

[0004] In view of this, the present invention provides a method for aligning a ship propulsion motor with a thrust bearing, so as to solve the problem that effective measurement cannot be carried out in the prior art in scenarios where the shaft cannot be turned by hand.

[0005] A method for aligning a ship propulsion motor with a thrust bearing, place the propulsion motor and the thrust bearing in place. Before installing the coupling, use a three-dimensional scanning tool to scan the front and rear planes and the outer circumferential surfaces of the motor flange connected to the propulsion motor and the bearing flange connected to the thrust bearing, fit the respective initial axes according to the respective outer circumferential surfaces, and establish a coordinate system. Extend the respective initial axes to the same plane in this coordinate system, judge the offset between the two, and if there is an offset, correct it to the qualified range; then install the coupling, and use the three-dimensional scanning tool to scan the rear plane and the outer circumferential surface of the motor flange and the bearing flange again, and synchronize this information to the coordinate system. Fit the respective final axes according to the respective outer circumferential surfaces, extend the respective final axes to the same plane in this coordinate system, judge the offset between the two, and if there is an offset, correct it to the qualified range.

[0006] Further, during the process of establishing the coordinate system, use a tracker to track the three-dimensional scanning tool, and incorporate the points scanned by the three-dimensional scanning tool into the same coordinate system.

[0007] Further, after installing the coupling and before scanning again, install a reflective patch on the propulsion motor and / or the thrust bearing and measure the position of the reflective point in the coordinate system. After installing the coupling, restore the coordinate system based on the position of the reflective patch.

[0008] Further, measure the horizontal plane of the thrust bearing base. The origin of the coordinate system is defined as the intersection point of the front plane of the bearing flange and the axis. The X-axis is defined as the axis of the bearing flange, the YZ plane is defined as the front plane of the bearing flange, and the XY plane is defined as the horizontal plane of the thrust bearing base.

[0009] Further, select corresponding points corresponding to the Y value and the Z value on the relative planes of the two flanges, measure the distances of multiple groups of corresponding points, and thus obtain the opening size of the two flanges.

[0010] Further, based on the center of the circle where the flange is located, construct a "plus" sign or a "cross" sign on the flange. The corresponding points are the intersection points of the "plus" sign or the "cross" sign and the edge of the flange.

[0011] Further, when extending their respective initial axes to the same plane in this coordinate system, use the front plane of the bearing flange as this plane.

[0012] Further, in the three-dimensional scanning stage, keep one of the two flanges stationary and rotate the other flange, scan again to obtain corresponding data, and judge the alignment degree of the flanges at different positions.

[0013] Further, during the process of rotating the flange, take a measurement every 90 degrees.

[0014] Further, keep the bearing flange stationary and rotate the motor flange.

[0015] The beneficial effects of the method for aligning a ship propulsion motor and a thrust bearing in the present invention are as follows: In the present invention, first, the propulsion motor and the thrust bearing are placed in place to facilitate subsequent measurement. After installing the coupling, the flange surfaces of the flanges will be blocked. Therefore, before installing the coupling, the positions of the two are measured first, and the propulsion motor and the thrust bearing are kept aligned to avoid overall misalignment caused by misalignment of the installation foundation. After installing the coupling, measurement is continued to ensure alignment before and after installation. Specifically, a three-dimensional scanning tool is used to scan the motor flange and the bearing flange before installation, and their respective axes are fitted according to their outer circumferences. By establishing a coordinate system, precise information about their axes is obtained. The respective initial axes are extended to the same plane in this coordinate system. If the two are aligned, they should be at the same point; if not, they will not be at the same point. After aligning the two, the coupling is installed, and the same method is used to detect the device after installing the coupling until the alignment is qualified. This method uses three-dimensional scanning, eliminating the need for barring the engine for inspection, thus solving the problem in the prior art that effective measurement cannot be carried out in scenarios where barring the engine is not possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 Schematic structural diagram of the propulsion motor and the thrust bearing placed in place;

[0018] Figure 2 Schematic structural diagram of the coupling installed between the propulsion motor and the thrust bearing;

[0019] Figure 3 Schematic structural diagram of the three-dimensional scanning tool.

[0020] The meanings of the reference numerals in the drawings are as follows: 1, thrust bearing; 2, bearing flange; 3, propulsion motor; 4, motor flange; 5, shafting; 6, coupling; 7, processor; 8, connecting cable; 9, tracker; 10, tracker bracket; 11, scanner. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be described through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0022] The terms used in this disclosure are for the purpose of describing particular embodiments only and are not intended to limit the disclosure. The singular forms "a", "the", and "said" used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses 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 only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0024] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0025] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two elements. It may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms may be understood according to specific circumstances.

[0026] In the subsequent description, the suffixes such as "module", "component", or "unit" used to represent elements are only for the convenience of describing the present invention, and they do not have a specific meaning in themselves. Therefore, "module" and "component" may be used interchangeably.

[0027] For a better understanding of the technical solution of the present invention, the present invention will be described in detail below with reference to the drawings.

[0028] In Embodiment 1 of the method for aligning a marine propulsion motor with a thrust bearing (hereinafter referred to as the alignment method) in the present invention:

[0029] In the centering method of the present invention, the preparation work before measurement is first carried out, which specifically includes:

[0030] 1. Install the thrust bearing 1, the propulsion motor 3 and its flange in place. As Figure 1 shown, clean the front surface, rear surface and outer peripheral surface of the motor flange 4 and the bearing flange 2, and keep no sundries interfering near the two flanges. The front surface refers to the flange surface of the two flanges for installing other components, and the rear surface is the surface arranged parallel to this plane.

[0031] 2. Install the three-dimensional scanning device, and use the three-dimensional scanning device to scan and measure the three surfaces of each component. In order to facilitate the representation of data in the coordinate system, a tracker 9 is also set. The scanner 11 should be within the irradiation range of the installed tracker 9 during the scanning process, and use the tracker 9 to measure the angle of the position of the scanner 11. The distance between the two should not exceed 3m, otherwise the scanning will not be successful, and it is ensured that there is no occlusion between the tracker 9 and the scanner 11. As Figure 3 shown, the tracker 9 is fixedly installed on the ground through the tracker 9 installation bracket. The scanner 11 can be manually taken. The tracker 9 always aims at a specific point on the scanner 11. All the data in the tracker 9 and the scanner 11 are transmitted into the processor 7 through the connection cable 8 for processing. In the processor 7, integrating the data of the tracker 9 and the scanner 11, the position and shape and other information of the two flanges are represented in the coordinate system.

[0032] 3. Perform data scanning on the outer circle and plane of the two flanges, and ensure that the flanges have no shaking or vibration during the scanning process; if the flange has the condition of barring the gears, perform data scanning once every 90° rotation of the two flanges; specifically, during the rotation process, keep the motor flange 4 rotating while the bearing flange 2 is stationary, because during the installation process, the length of the shafting 5 usually connected to the bearing flange 2 is relatively large and it is difficult to rotate.

[0033] 4. Analyze and process the collected centering data:

[0034] S401. Fit the data respectively to establish the data of the motor flange 4 and the bearing flange 2, including the front plane and the rear plane;

[0035] S402. Fit the data respectively to establish the outer circle circumferences of the two flanges;

[0036] S403. Establish the axes of the front and rear two cylinders and their intersection points with the front plane of the flange;

[0037] S404. Fit the data to establish the base horizontal plane of the bearing flange 2. Since the base is default to be horizontal, this plane can be used as a reference to establish a horizontal plane, which is convenient for the establishment of the coordinate system;

[0038] S405, converting the data coordinate axis system 5 into the axis system 5 coordinate system, specifically:

[0039] Origin: the intersection of the front plane of bearing flange 2 and its axis;

[0040] X-axis: bearing flange 2 axis;

[0041] YZ plane: front plane of bearing flange 2;

[0042] S406, the coordinate value of the intersection of the motor flange 4 axis and the front plane, i.e., the centering deviation, is compared with the standard to determine whether it is qualified; if it is unqualified, the positions of the two are adjusted so that the positions of the two meet the centering requirements;

[0043] S407, using software functions to analyze and calculate the parallelism of the planes of the two flanges and the parallelism of the two opposite surfaces; since the front planes of the two flanges will be blocked after the coupling 6 is installed, analyzing the parallelism of the two flanges can also provide a basis for measuring only the rear plane after the coupling 6 is installed;

[0044] S408. Establish edge points with one-to-one correspondence between Y value and Z value on two flange surfaces in a "X" or "M" shape;

[0045] S409, calculate the distance between the corresponding points, obtain the maximum and minimum values of the opening distance, and compare with the standard to determine whether it is qualified.

[0046] S410. For flanges that meet the conditions for turning, calculate the average value of the four sets of alignment data and compare them with the standards to determine whether the alignment results of the two flanges are qualified. If they are unqualified, there will be shaking on the flange surface during the rotation process, which indicates that the part may be unqualified and needs to be replaced. If they are qualified, the influence of the two flanges' own processing accuracy and the two flange bearing clearance can be eliminated, thereby improving the accuracy of the alignment data.

[0047] This completes the correction before installing the coupling 6. After installing the coupling 6, scanning measurement needs to be performed again to ensure that the propulsion motor 3 and the thrust bearing 1 are still coaxial after installation. Specifically, the steps are as follows:

[0048] 1. Clean the rear surface and outer peripheral surface of the motor flange 4 and the bearing flange 2, and keep the two flanges free of debris. The front surface refers to the flange surface of the two flanges used to install other components, and the rear surface is the surface arranged parallel to this plane.

[0049] 2. Paste reflective patches at intervals of about 300mm in the entire area of the device to be scanned; this allows the reflective patches to be used as specific points for anchoring during scanning, making it easier to restore the coordinate system;

[0050] 3. Install a 3D scanning device and use it to scan and measure the three surfaces of each component. To facilitate data representation in the coordinate system, a tracker 9 is also provided. During the scanning process, the scanner 11 should be within the irradiation range of the installed tracker 9, and the tracker 9 is used to measure the angle of the position of the scanner 11. The distance between the two should not exceed 3m, otherwise the scanning will not be successful, and it is necessary to ensure that there is no obstruction between the tracker 9 and the scanner 11;

[0051] 4. Use the tracker 9 to scan and record the positions of the reflective patches;

[0052] 5. Conduct data scanning on the outer circle and front plane of the two flange plates. During the scanning process, ensure that the flange plates do not shake or vibrate; if the flange plates have the condition for barring the gears, conduct data scanning every 90° rotation of the two flanges; specifically, during the rotation process, keep the motor flange plate 4 rotating while the bearing flange plate 2 remains stationary. This is because during the installation process, the length of the shafting 5 usually connected to the bearing flange plate 2 is relatively large and it is difficult to rotate.

[0053] 6. Analyze and process the collected alignment data:

[0054] S601. Fit the data separately to establish the data of the rear planes of the motor flange plate 4 and the bearing flange plate 2;

[0055] S602. Fit the data separately to establish the outer circle circumferences of the two flanges;

[0056] S603. Establish the axes of the front and rear cylinders respectively, that is, the intersection points of the axes with the front planes of the flange plates;

[0057] S604. Fit the data to establish the base horizontal plane of the bearing flange plate 2. Since the base is default to be horizontal, a horizontal plane can be established based on this plane, which is convenient for establishing the coordinate system;

[0058] S605. Convert the data coordinate axis system 5 to the axis system 5 coordinate system. Specifically:

[0059] Origin: The intersection point of the front plane of the bearing flange plate 2 and its axis;

[0060] X-axis: The axis of the bearing flange plate 2;

[0061] YZ plane: The front plane of the bearing flange plate 2;

[0062] S606. The coordinate value of the intersection point of the axis of the motor flange plate 4 and the front plane is the alignment deviation. Compare with the standard to judge whether it is qualified; if it is unqualified, adjust the positions of the two to make their positions meet the alignment requirements;

[0063] S607. Use the software function to analyze and calculate the parallelism of the two opposite surfaces in the two flanges;

[0064] S608. Use a "X" or "M" shape to establish edge points on the two flange surfaces with Y values and Z values corresponding to each other;

[0065] S609, calculate the distance between the corresponding points, obtain the maximum and minimum values of the opening distance, and compare with the standard to determine whether it is qualified.

[0066] S610. For flanges that meet the conditions for turning, calculate the average value of the four sets of alignment data and compare them with the standards to determine whether the alignment results of the two flanges are qualified. If they are unqualified, there will be shaking on the flange surface during the rotation process, which indicates that the part may be unqualified and needs to be replaced. If they are qualified, the influence of the two flanges' own processing accuracy and the two flange bearing clearance can be eliminated, thereby improving the accuracy of the alignment data.

[0067] It should be clear that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A method for aligning a ship propulsion motor and a thrust bearing, characterized in that: Place the propulsion motor and the thrust bearing in place. Before installing the coupling, use a 3D scanning tool to scan the front and rear planes and the outer circular surfaces of the motor flange connected to the propulsion motor and the bearing flange connected to the thrust bearing. Fit the respective initial axes based on their outer circular surfaces, establish a coordinate system, extend the respective initial axes to the same plane in this coordinate system, judge the offset between the two, and correct it to the qualified range if there is an offset; then install the coupling, use the 3D scanning tool to scan the rear plane and the outer circular surface of the motor flange and the bearing flange again, and synchronize this information into the said coordinate system. Fit the respective final axes based on their outer circular surfaces, extend the respective final axes to the same plane in this coordinate system, judge the offset between the two, and correct it to the qualified range if there is an offset.

2. The method for aligning a marine propulsion motor and a thrust bearing according to claim 1, characterized in that: During the process of establishing the coordinate system, use a tracker to track the 3D scanning tool and incorporate the points scanned by the 3D scanning tool into the same coordinate system.

3. The method for aligning a marine propulsion motor and a thrust bearing according to claim 1 or 2, characterized in that: After installing the coupling and before scanning again, install a reflective patch on the propulsion motor and / or the thrust bearing and measure the position of the reflective point in the coordinate system. After installing the coupling, restore the coordinate system based on the position of the reflective patch.

4. The method for aligning a marine propulsion motor and a thrust bearing according to claim 1 or 2, characterized in that: Measure the horizontal plane of the thrust bearing pedestal. The origin of the coordinate system is defined as the intersection point of the front plane of the bearing flange and the axis, the X-axis is defined as the axis of the bearing flange, the YZ plane is defined as the front plane of the bearing flange, and the XY plane is defined as the horizontal plane of the thrust bearing pedestal.

5. The method for aligning a marine propulsion motor and a thrust bearing according to claim 4, characterized in that: Select corresponding points corresponding to the Y value and the Z value on the relative planes of the two flanges, measure the distances of multiple groups of corresponding points, and thus obtain the opening size of the two flanges.

6. The method for aligning a marine propulsion motor with a thrust bearing according to claim 5, characterized in that: Based on the center of the circle where the flange is located, construct a "cross" line or a "plus" line on the flange, and the corresponding points are the intersection points of the "cross" line or the "plus" line and the edge of the flange.

7. The method for aligning a marine propulsion motor and a thrust bearing according to claim 1 or 2, characterized in that: When extending the respective initial axes to the same plane in this coordinate system, use the front plane of the bearing flange as this plane.

8. The method for aligning a marine propulsion motor and a thrust bearing according to claim 1 or 2, characterized in that: During the 3D scanning stage, keep one of the two flanges stationary, rotate the other flange, scan again to obtain corresponding data, and judge the alignment degree of the flanges at different positions.

9. The method for aligning a marine propulsion motor and a thrust bearing according to claim 8, wherein: During the process of rotating the flange, take a measurement every 90 degrees.

10. The method for aligning a marine propulsion motor and a thrust bearing according to claim 8, characterized in that: Keep the bearing flange stationary and rotate the motor flange.

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