Method and device for measuring the shaft alignment of a diesel engine unit with a bulkhead barrier by means of a laser tracker

Abstract

The application discloses a method and device for measuring the shaft alignment of a diesel engine and a generator set blocked by a bulkhead by using a laser tracker. The method and device use a high-precision laser tracker, and overcomes the blocking obstacle of the bulkhead by opening a process hole in the bulkhead. The data of each measuring point on the main shafts of the diesel engine and the generator are collected respectively, and then the data are processed and analyzed by software to obtain the shaft alignment result data of the two main shafts, such as the shaft center coordinate deviation, the shaft center line angle and the distance between the flanges of the two main shafts. The application fully excavates the functions of the laser tracker, and plays the application of the laser tracker in the shaft alignment measurement of the diesel engine and the generator set of a large ship. The application solves the problem of the shaft alignment measurement of the diesel engine and the generator set blocked by the bulkhead, and can replace the traditional dial gauge or digital laser alignment instrument to overcome the shortcomings of the shaft alignment measurement of the dial gauge or the digital laser alignment instrument in a complex measurement environment. The application greatly improves the precision, efficiency and visibility of the shaft alignment of the diesel engine and the generator set of a large ship, and has high practical value.

Description

TECHNICAL FIELD

[0001] The present application relates to shipbuilding, in particular to a method and device for realizing shaft alignment measurement of large ship diesel engine unit with bulkhead barrier by laser tracker. BACKGROUND

[0002] In the shipbuilding process, the commonly used shafting equipment shaft alignment measurement methods include traditional mechanical dial gauge measurement method and digital laser alignment instrument measurement method. When the diesel engine unit of large ship has bulkhead barrier, due to the light path obstruction in the shafting measurement site and the inconvenience of two shaft rotation, it is difficult to use dial gauge and laser alignment instrument for shaft alignment measurement, and a new method is needed to solve this problem. SUMMARY

[0004]

[0003] In view of the problems existing in the prior art, the present application provides a method and device for measuring shaft alignment of diesel engine unit with bulkhead barrier by laser tracker. After using the method and device, the bulkhead barrier obstacle is overcome by opening process holes in the bulkhead, and then the data of each measurement point on the diesel engine and generator main shaft flange circle are collected by data acquisition and processing software, so as to calculate the shaft alignment result data. The method can replace the traditional dial gauge or digital laser alignment instrument in the shaft alignment measurement in complex measurement environment, has the advantages of high precision, good stability, high efficiency and visual measurement data, and has high practical value.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is:

[0005] The present application provides a method for measuring shaft alignment of diesel engine unit with bulkhead barrier by laser tracker, comprising the following steps:

[0006] Step 1: erecting the laser tracker:

[0007] The laser tracker is erected near the generator main shaft, ensuring that the triangular support of the laser tracker is stable and the contact surface is rigid and has no vibration;

[0008] Step 2: light path inspection:

[0009] According to the visual range of the laser tracker, the appropriate erection position of the laser tracker is determined, and in the measurement environment of the diesel engine unit, a plurality of process holes are opened on the bulkhead to guide the light of the tracker target ball;

[0010] Step 3: instrument calibration:

[0011] Connect the laser tracker to the computer and start the laser tracker, and before measurement, calibrate the laser tracker, place the calibration tripod in a stable position, use the calibration software, and guide the tracker target ball light to the calibration point of the calibration tripod, execute the calibration operation, and when the calibration error meets the requirements, the instrument calibration operation is completed;

[0012] Step four: measurement point data acquisition:

[0013] After the laser tracker calibration is completed, measurement point data is collected, wherein the tracker target ball light is guided to collect diesel engine measurement point data through the process hole;

[0014] Step five: data processing and analysis:

[0015] The data acquisition and processing software is used to process and analyze the measurement point data of the two main shaft flange circles of the diesel engine unit, and the axis center coordinate deviation, axis center line angle and distance between the two main shaft flange circles of the diesel engine unit are obtained.

[0016] In order to solve the technical problems, the further technical solutions adopted by the present application are:

[0017] Optionally, the method for measuring the cabin wall barrier diesel engine unit shaft centering by using the laser tracker, wherein in step four, the measurement point data acquisition step further comprises:

[0018] Step four one: the tracker target ball is placed on the two main shaft flange circles of the diesel engine unit to collect a plurality of points, and the distance between the two main shaft flange circles is obtained by fitting a plane;

[0019] Step four two: in the selection of the measurement points on the diesel engine main shaft flange circle, one of the measurement points is set at the highest point of the circumference of the diesel engine main shaft flange circle, and the measurement point participates in establishing a reference coordinate system; the collection area of the measurement point is located in the measurement area of the diesel engine main shaft flange circle, and the measurement point is selected in the area;

[0020] Step four three: in the selection of the measurement points on the generator main shaft flange circle, the tracker target ball light is first guided to be adsorbed on the pin base, and then the pin base is tightly attached to the circumferential edge of the diesel engine main shaft flange circle, and then the measurement points are collected in the visible area.

[0021] Optionally, the method for measuring the cabin wall barrier diesel engine unit shaft centering by using the laser tracker, wherein in step four two, the collection area of the measurement point on the diesel engine main shaft flange circle is located in the measurement area of 1 / 3 to 1 / 2 of the laser coverable circle, and 5-8 measurement points are selected in the collection area.

[0022] Optionally, the method for measuring the shaft centering of the diesel generator set blocked by the bulkhead with the laser tracker, wherein in step four three, the visual area collects 5-8 measuring points.

[0023] Optionally, the method for measuring the shaft centering of the diesel generator set blocked by the bulkhead with the laser tracker, wherein in step five, the data acquisition and processing software is used to collect the measuring points, and the step further comprises:

[0024] Step five one: all the measuring points on the flange circle of the two main shafts of the diesel generator set are selected, and the first circle and the second circle are formed by the best fitting;

[0025] Step five two: the center point feature of the first circle of the diesel engine main shaft flange circle is obtained;

[0026] Step five three: the plane feature of the first circle of the diesel engine main shaft flange circle is obtained;

[0027] Step five four: the reference coordinate system is created by taking the center point feature, the plane feature and the highest measuring point of the diesel engine shaft circle as the reference features;

[0028] Step five five: after the reference coordinate system is constructed, since the origin of the reference coordinate system is the center of the first circle, the deviation value of the Y and Z coordinates of the second circle is directly read in the software, that is, the shaft center coordinate deviation of the two main shafts of the diesel generator set;

[0029] Step five six: the normal angle between the first circle and the second circle is obtained through the angle query operation, that is, the shaft center angle of the two main shafts of the diesel generator set;

[0030] Step five seven: the distance between the plane where the first circle is located and the plane where the second circle is located is obtained through the distance query operation, that is, the distance between the two main shaft flange circles.

[0031] Optionally, the method for measuring the shaft centering of the diesel generator set blocked by the bulkhead with the laser tracker, wherein in step five four, the X, Y and Z axes are manually adjusted before the reference coordinate system is created.

[0032] To solve the above technical problems, the technical solutions adopted by the present application are:

[0033] The application provides a device for measuring the shaft alignment of a diesel generator set blocked by a bulkhead by using a laser tracker, which comprises a diesel engine, a diesel engine main shaft flange circle, a bulkhead, a generator main shaft flange circle, a generator, a laser tracker and a tracker target ball, the diesel engine is fixedly connected with the diesel engine main shaft flange circle, the generator is fixedly connected with the generator main shaft flange circle, the circumferences of the diesel engine main shaft flange circle and the generator main shaft flange circle are both used for collecting data by being attached to the movable tracker target ball, the bulkhead is arranged between the diesel engine main shaft flange circle and the generator main shaft flange circle, the bulkhead is provided with a plurality of process holes, the laser tracker collects the measuring points of the tracker target ball on the diesel engine main shaft flange circle and the generator main shaft flange circle by the tracker target ball, and the tracker target ball is used for guiding light to pass through the process holes of the bulkhead.

[0034] Optionally, the device for measuring the shaft alignment of a diesel generator set blocked by a bulkhead by using a laser tracker, further comprises a computer, the computer is electrically connected with the laser tracker, the computer is installed with calibration software and data acquisition and processing software, the calibration software guides light of the tracker target ball to calibration points of a calibration triangular support, executes a calibration operation program, and the data acquisition and processing software processes and analyzes the data of each measuring point of the two main shaft flange circles of the diesel generator set, so as to obtain the shaft center coordinate deviation, the shaft center line angle and the distance between the two main shaft flange circles and other shaft alignment result data of the two main shafts.

[0035] Compared with the prior art, the application has the following technical effects:

[0036] The application uses a high-precision laser tracker, controls through a data acquisition and processing software, overcomes the blocking obstacle of the bulkhead by arranging process holes in the bulkhead, collects the data of each measuring point on the main shafts of the diesel engine and the generator, and then processes and analyzes the data through the software, so as to obtain the shaft center coordinate deviation, the shaft center line angle and the distance between the two main shaft flange circles and other shaft alignment result data of the two main shafts. The application fully excavates the function of the laser tracker itself, plays the application of the laser tracker in the shaft alignment measurement of the diesel generator set of a large ship, solves the problem of the shaft alignment measurement of the diesel generator set blocked by the bulkhead, can replace the traditional dial gauge or digital laser alignment instrument to solve the problem of the shaft alignment measurement in a complex measurement environment, greatly improves the precision, efficiency and visibility of the shaft alignment of the diesel generator set of a large ship, and has high practical value.

[0037] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application and can be implemented according to the content of the description, the following will be described in detail with the preferred embodiments of the application and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0039] Figure 1 is a flowchart of a method for measuring the shaft centering of a diesel generator set by a laser tracker according to the present application;

[0040] Figure 2 is a flowchart of a method for measuring the shaft centering of a diesel generator set by a laser tracker according to the present application;

[0041] Figure 3 is an operation diagram for collecting the measurement points by using the data collection and processing software according to the present application;

[0042] Figure 4 is an operation diagram for fitting the circumferences of the flanges of the two main shafts of the diesel generator set by using the data collection and processing software according to the present application;

[0043] Figure 5 is an operation diagram for generating the center point features of the flange circle of the diesel engine main shaft by using the data collection and processing software according to the present application;

[0044] Figure 6 is an operation diagram for generating the plane features of the flange circle of the diesel engine main shaft by using the data collection and processing software according to the present application;

[0045] Figure 7 is an operation diagram for creating the reference coordinate system by using the data collection and processing software according to the present application;

[0046] Figure 8 is an operation diagram for displaying the axial coordinate deviation of the two main shafts of the diesel generator set by using the data collection and processing software according to the present application;

[0047] Figure 9 is an operation diagram for inquiring the included angle of the axial lines of the two main shafts of the diesel generator set by using the data collection and processing software according to the present application;

[0048] Figure 10 is an operation diagram for inquiring the distance between the flange circles of the two main shafts of the diesel generator set by using the data collection and processing software according to the present application.

[0049] wherein the diesel engine 1, the flange circle of the diesel engine main shaft 2, the bulkhead 3, the process hole 31, the flange circle of the generator main shaft 4, the generator 5, the computer 6, the laser tracker 7 and the tracker target ball 8. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper", "lower", "left" and "right" generally refer to the upper, lower, left and right of the device in the actual use or working state, and specifically refer to the drawing plane direction in the drawings.

[0051] The present application provides a method and device for measuring the shaft alignment of a diesel generator set blocked by a bulkhead with a laser tracker. The following will be described in detail. It should be noted that the description order of the following embodiments is not used to limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0052] The present application overcomes the blocking obstacle of the bulkhead by opening a process hole in the bulkhead, and then collects the data of each measurement point on the diesel engine and generator main shafts respectively through data acquisition and processing software, so as to calculate the shaft alignment result data. The present application can replace the traditional dial gauge or digital laser alignment instrument to measure the shaft alignment in a complex measurement environment, has the advantages of high precision, good stability, high efficiency and visual measurement data, and has high practical value.

[0053] Embodiment 1

[0054] Please refer to Figures 1-9 The present application provides a method for measuring the shaft alignment of a diesel generator set blocked by a bulkhead with a laser tracker, which comprises the following steps:

[0055] Step 1: erecting a laser tracker

[0056] The instrument of the laser tracker is erected near the generator main shaft, and the triangular support of the laser tracker is stable and has strong contact surface rigidity without vibration;

[0057] Step 2: light path inspection

[0058] According to the visual range of the laser tracker, a suitable erection position of the laser tracker is determined, and a plurality of process holes are opened on the bulkhead in the measurement environment of the diesel generator set to guide the light of the target ball of the laser tracker.

[0059] Step 3: instrument calibration

[0060] Connect the laser tracker to the computer and start the laser tracker, and before measurement, calibrate the laser tracker, place the calibration tripod in a stable position, use the calibration software, and guide the tracker target ball light to the calibration point of the calibration tripod, execute the calibration operation, and when the calibration error meets the requirements, the instrument calibration operation is completed;

[0061] Step four: measurement point data acquisition:

[0062] After the laser tracker calibration is completed, measurement point data is collected, wherein the tracker target ball light is guided to collect diesel engine measurement point data through the process hole;

[0063] Step five: data processing and analysis:

[0064] The data acquisition and processing software is used to process and analyze the measurement point data of the two main shaft flange circles of the diesel engine unit, and the axis center coordinate deviation, axis center line angle, and distance between the two main shaft flange circles are obtained.

[0065] In step four of the embodiment, the measurement point data acquisition step further includes:

[0066] Step four one: the tracker target ball is placed on the two main shaft flange circles of the diesel engine unit to collect a plurality of points, and the distance between the two main shaft flange circles is obtained by fitting a plane;

[0067] Step four two: in the selection of the measurement points of the diesel engine main shaft flange circle, one of the measurement points is set at the highest point of the circumference of the diesel engine main shaft flange circle, and this measurement point is used to establish a reference coordinate system. The measurement point collection area is located in the measurement area of the diesel engine main shaft flange circle, and the measurement points are selected in this area.

[0068] Step four three: in the measurement point collection of the generator main shaft flange circle, first, the tracker target ball light is guided and adsorbed on the pin base, then the pin base is tightly attached to the edge of the circumference of the diesel engine main shaft flange circle, and then the measurement points are collected in the visible area.

[0069] Further preferably, in step four two, the measurement point collection area of the diesel engine main shaft flange circle is located in the measurement area of 1 / 3 to 1 / 2 of the laser coverable circle, and 5-8 measurement points are selected in this collection area.

[0070] Further preferably, in step four three, the visible area collects 5-8 measurement points.

[0071] In step five of the embodiment, the data acquisition and processing software is used to collect measurement points, as shown in Figure 3 Further includes:

[0072] Step five one: select all measurement points of the two main shaft flange circles of the diesel engine unit, and the best fitting forms a first circle and a second circle, as shown in Figure 4

[0073] Step five two: the first circle of the diesel engine main shaft flange circle generates its center point feature, as shown in Figure 5

[0074] Step five three: the first circle of the diesel engine main shaft flange circle generates its plane feature, as shown in Figure 6

[0075] Step five four: the center point feature, the plane feature and the highest measurement point of the diesel engine shaft circle are taken as reference features to create a reference coordinate system, as shown in Figure 7

[0076] Step five five: after the reference coordinate system is constructed, since the origin of the reference coordinate system is the center of the first circle, the Y and Z coordinate deviation values of the second circle are directly read in the software, which are the shaft center coordinate deviations of the two main shafts of the diesel engine unit, as shown in Figure 8

[0077] Step five six: through angle query operation, the normal angle between the first circle and the second circle is obtained, which is the shaft center line angle of the two main shafts of the diesel engine unit, as shown in Figure 9

[0078] Step five seven: through distance query operation, the distance between the plane where the first circle is located and the plane where the second circle is located is obtained, which is the distance between the two main shaft flange circles, as shown in Figure 10

[0079] Further preferably, in step five four, before creating the reference coordinate system, the X, Y and Z axes are manually adjusted.

[0080] Example 2

[0081] Please refer to Figure 1 and Figure 2 ​​​​​​​This application also provides a device for measuring the shaft alignment of a diesel generator set by using a laser tracker to block the bulkhead, including a diesel engine 1, a diesel engine main shaft flange circle 2, a bulkhead 3, a generator main shaft flange circle 4, a generator 5, a laser tracker 7, and a tracker target ball 8. The diesel engine 1 is fixedly connected to the diesel engine main shaft flange circle 2, and the generator 5 is fixedly connected to the generator main shaft flange circle 4. Data is collected on the circumferences of both the diesel engine main shaft flange circle 2 and the generator main shaft flange circle 4 by contacting the movable tracker target ball 8. The bulkhead 3 is disposed between the diesel engine main shaft flange circle 2 and the generator main shaft flange circle 4. The bulkhead 3 has several process holes 31. The laser tracker 7 collects the measurement points of the tracker target ball 8 on the diesel engine main shaft flange circle 2 and the generator main shaft flange circle 4 through the tracker target ball 8. The tracker target ball 8 is used to guide light through the process holes 31 of the bulkhead 3.

[0082] Further preferably, the system also includes a computer 6, which is electrically connected to the laser tracker 7. The computer 6 is equipped with calibration software and data acquisition and processing software. The calibration software guides the target ball of the tracker to the calibration point of the calibration tripod and executes the calibration operation procedure. The data acquisition and processing software processes and analyzes the data of each measurement point on the flange circle of the two main shafts of the diesel generator unit to obtain shaft alignment results such as the shaft center coordinate deviation, the included angle of the shaft centerline, and the distance between the flange circles of the two main shafts.

[0083] The working principle and process of this invention:

[0084] like Figures 1-10 As shown, a method for measuring the shaft alignment of a diesel generator unit blocked by a bulkhead using a laser tracker includes the following steps:

[0085] Step 1: Set up the laser tracker:

[0086] The laser tracker is mounted near the generator main shaft, ensuring that the laser tracker's tripod is stable and the contact surface is rigid and free from vibration.

[0087] Step 2: Optical path inspection:

[0088] The appropriate installation location for the laser tracker is determined based on its field of view. In the measurement environment of this diesel generator unit, several process holes are opened on the bulkhead for the target ball of the tracker to guide the light.

[0089] Step 3: Instrument Calibration

[0090] Connect the laser tracker to the computer and start the laser tracker, before measurement, calibrate the laser tracker, place the calibration tripod in a stable position, use the calibration software, and guide the tracker target ball light to the calibration point of the calibration tripod, perform the calibration operation, and when the calibration error meets the requirements, the instrument calibration operation is completed;

[0091] Step four: measurement point data acquisition:

[0092] After the laser tracker is calibrated, measurement point data is collected, wherein the measurement point data of the diesel engine is collected by guiding the tracker target ball light through the process hole;

[0093] Specifically, in step four, the measurement point data acquisition step further includes:

[0094] Step four one: place the tracker target ball on the two main shaft flange circles of the diesel engine unit to collect a plurality of points, and use the collected points to fit a plane to obtain the distance value of the two main shaft flange circles;

[0095] Step four two: in the selection of the measurement points on the diesel engine main shaft flange circle, set one of the measurement points at the highest point on the circumference of the diesel engine main shaft flange circle, and use this measurement point to establish a reference coordinate system. The measurement point collection area is located in the measurement area of the diesel engine main shaft flange circle, and the measurement points are selected in this area;

[0096] Step four three: in the measurement point collection of the generator main shaft flange circle, first guide the tracker target ball light to be adsorbed on the pin base, then tightly abut the pin base on the circumferential edge of the diesel engine main shaft flange circle, and then collect measurement points in the visible area;

[0097] Step five: data processing and analysis:

[0098] Use the data acquisition and processing software to process and analyze the measurement point data of the two main shaft flange circles of the diesel engine unit, and obtain the shaft center coordinate deviation, shaft center line angle, and distance between the two main shaft flange circles, etc. The shaft centering result data;

[0099] Specifically, in step five, the data processing and analysis step further includes:

[0100] Step five one: select all the measurement points on the circumferences of the two main shaft flange circles of the diesel engine unit, and best fit to form a first circle and a second circle;

[0101] Step five two: generate the center point feature of the diesel engine main shaft flange circle from the first circle;

[0102] Step five three: generate the plane feature where the diesel engine main shaft flange circle is located from the first circle;

[0103] Step five four: the reference coordinate system is created by taking the center point feature, the plane feature and the highest measuring point of the diesel engine shaft great circle as the reference features;

[0104] Step five five: after the reference coordinate system is constructed, since the reference coordinate system origin is the center of the first circle, the Y and Z coordinate deviation values of the second circle are directly read in the software, which are the shaft center coordinate deviations of the two main shafts of the diesel generator set;

[0105] Step five six: the normal angle between the first circle and the second circle is obtained through the angle query operation, which is the shaft center line angle of the two main shafts of the diesel generator set;

[0106] Step five seven: the distance between the plane where the first circle is located and the plane where the second circle is located is obtained through the distance query operation, which is the flange circle distance of the two main shafts;

[0107] Through the above data processing and analysis steps, the large ship cabin wall blocking diesel generator set shaft alignment result data is obtained.

[0108] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or direct or indirect application in other related technical fields based on the content of the specification and drawings is also included in the patent protection scope of the present application.

Claims

1. A method for measuring the shaft alignment of a diesel generator unit obstructed by a bulkhead using a laser tracker, characterized in that: Includes the following steps: Step 1: Set up the laser tracker: The laser tracker is mounted near the generator main shaft, ensuring that the laser tracker's tripod is stable and the contact surface is rigid and free from vibration. Step 2: Optical path inspection: The appropriate installation location for the laser tracker is determined based on its field of view. In the measurement environment of this diesel generator unit, several process holes are opened on the bulkhead for the target ball of the tracker to guide the light. Step 3: Instrument Calibration Connect the laser tracker to the computer and start the laser tracker. Before measurement, calibrate the laser tracker. Place the calibration tripod in a stable position. Use the calibration software to guide the target ball of the tracker to the calibration point of the calibration tripod and perform the calibration operation. When the calibration error meets the requirements, the instrument calibration operation is completed. Step 4: Data Acquisition at Measurement Points After the laser tracker is calibrated, measurement point data is collected. Specifically, the diesel engine measurement point data is collected by guiding light through the process hole using the tracker's target ball. Step 5: Data Processing and Analysis Data acquisition and processing software was used to process and analyze the data of each measuring point on the flange circle of the two main shafts of the diesel generator unit, and the shaft alignment results data such as the shaft center coordinate deviation, the included angle of the shaft centerline, and the distance between the flange circles of the two main shafts were obtained.

2. The method for measuring the shaft alignment of a diesel generator unit with bulkhead obstruction using a laser tracker according to claim 1, characterized in that: In step four, the step of acquiring measurement point data further includes: Step 41: Place the target ball of the tracking instrument bare against the circular surface of the two main shaft flanges of the diesel generator set and collect several points to fit the plane and obtain the distance value between the two main shaft flange circular surfaces; Step 42: In selecting the measurement points of the diesel engine main shaft flange circle, set one of the measurement points at the highest point of the circumference of the diesel engine main shaft flange circle, and use this measurement point to establish a reference coordinate system. The acquisition area of ​​the measurement point is located in the measurement area of ​​the diesel engine main shaft flange circle, and the measurement point is selected within this area. Step 43: In the acquisition of measurement points on the generator main shaft flange circle, first guide the light from the target ball of the tracker and attach it to the pin base, then place the pin base close to the circumferential edge of the diesel engine main shaft flange circle, and then acquire measurement points in the visible area.

3. The method for measuring the shaft alignment of a diesel generator unit with bulkhead obstruction using a laser tracker according to claim 2, characterized in that: In step four, the acquisition area of ​​the diesel engine main shaft flange circle measurement point is located in the measurement area of ​​1 / 3 to 1 / 2 circle that can be covered by the laser, and 5-8 measurement points are selected within this acquisition area.

4. The method for measuring the shaft alignment of a diesel generator unit with bulkhead obstruction using a laser tracker according to claim 2, characterized in that: In step four, five to eight measurement points are selected for the visible area.

5. The method for measuring the shaft alignment of a diesel generator unit blocked by a bulkhead using a laser tracker according to claim 1, characterized in that: In step five, the steps for collecting measurement points using data acquisition and processing software also include: Step 51: Select all measurement points around the circumference of the two main shaft flanges of the diesel generator unit, and use the best fit to form the first and second circles; Step 52: Obtain the center point feature from the first circle of the diesel engine main shaft flange; Step 53: Generate the planar feature containing the first circle of the diesel engine main shaft flange; Step 54: Create a reference coordinate system using the center point feature, the plane feature, and the highest measurement point of the great circle of the diesel engine shaft as reference features; Step 55: After the reference coordinate system is constructed, since the origin of the reference coordinate system is the center of the first circle, the deviation values ​​of the Y and Z coordinates of the second circle can be directly read in the software, which are the axis center coordinate deviations of the two main shafts of the diesel generator unit. Steps 5 and 6: By performing an angle query operation, the normal angle between the first circle and the second circle is obtained, which is the angle between the centerlines of the two main shafts of the diesel generator unit. Step 57: By performing a distance query operation, the distance between the plane containing the first circle and the plane containing the second circle is obtained, which is the distance between the circular surfaces of the two main spindle flanges.

6. The method for measuring the shaft alignment of a diesel generator unit with bulkhead obstruction using a laser tracker according to claim 5, characterized in that: In step 54, before creating the reference coordinate system, manually adjust the orientation of the X, Y, and Z axes.

7. A device for measuring the shaft alignment of a diesel generator unit obstructed by a laser tracker, characterized in that: The system includes a diesel engine (1), a diesel engine main shaft flange circle (2), a bulkhead (3), a generator main shaft flange circle (4), a generator (5), a laser tracker (7), and a tracker target ball (8). The diesel engine (1) is fixedly connected to the diesel engine main shaft flange circle (2), and the generator (5) is fixedly connected to the generator main shaft flange circle (4). Data is collected by the circumference of the diesel engine main shaft flange circle (2) and the generator main shaft flange circle (4) through contact with the mobile tracker target ball (8). The bulkhead (3) is located between the diesel engine main shaft flange circle (2) and the generator main shaft flange circle (4). The bulkhead (3) has several process holes (31). The laser tracker (7) collects the measurement points of the tracker target ball (8) on the diesel engine main shaft flange circle (2) and the generator main shaft flange circle (4) through the tracker target ball (8). The tracker target ball (8) is used to guide light through the process holes (31) of the bulkhead (3).

8. The device for measuring the shaft alignment of a diesel generator unit blocked by a bulkhead using a laser tracker according to claim 7, characterized in that: It also includes a computer (6), which is electrically connected to the laser tracker (7). The computer (6) is equipped with calibration software and data acquisition and processing software. The calibration software guides the target ball of the tracker to the calibration point of the calibration tripod and executes the calibration operation program. The data acquisition and processing software processes and analyzes the data of each measurement point on the flange circle of the two main shafts of the diesel generator unit to obtain the shaft center coordinate deviation, the included angle of the shaft center line and the distance between the flange circles of the two main shafts, etc., and the shaft alignment result data.

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