A method and system for measuring the center locus of the inner and outer shafts in a two-axis mode

Abstract

The present application provides a method and system for measuring the center locus of the inner and outer shafts in a biaxial mode. The method includes: n measuring holes are evenly distributed in the circumferential direction of the same axial position section of the outer shaft in the biaxial shaft system, where n is an integer multiple of 4. At the same time, a first and a second laser displacement sensor are arranged vertically and horizontally at the axial positions adapted to the measuring holes; when the inner shaft and the outer shaft rotate independently at the same time, when the light rays of the first and second laser displacement sensors synchronously pass through the measuring holes on the outer shaft, are incident and return, the real-time horizontal and vertical displacements of the inner shaft are obtained, and then the center locus characteristics of the inner shaft are obtained; when the light rays of the first and second laser displacement sensors simultaneously leave the measuring holes on the outer shaft and cannot be incident and return from the journal of the outer shaft, the light rays of the first and second laser displacement sensors are simultaneously incident on the surface of the outer shaft and return. At this time, the real-time horizontal and vertical distance displacements of the outer shaft are obtained, and then the center locus characteristics of the outer shaft are obtained.

Description

Technical Field

[0001] This application belongs to the field of shaft center orbit measurement, and particularly relates to a method and system for measuring the inner and outer shaft center orbits in a dual-axis mode. Background Technique

[0002] During the commissioning and operation of a large rotating tester (such as an aero-engine), when the rotational speed of the shafting reaches over 10,000 rpm and often changes, it is necessary to monitor the stable operation of the shafting.

[0003] In the prior art, a certain dual-axis rotating tester adopts a design method of coaxial output of the inner and outer shafts, with the inner shaft sleeved in the outer shaft and the two shafts operating simultaneously. During the test, in order to prevent radial rubbing caused by non-concentricity and axial offset of the inner and outer shafts, it is necessary to monitor the shaft center orbits of the inner and outer shafts in real time.

[0004] As Figure 1 shown in the schematic diagram of the shaft center orbit test in the single-axis mode of the prior art, two displacement sensors 11 are respectively arranged at the horizontal and vertical positions of the same axial section of the rotating shaft 12 to collect the horizontal and vertical displacement data of the rotating shaft. After analysis by the data processing device 13, the shaft center orbit of the rotating shaft can be obtained (the shaft center orbit refers to the movement track of a point on the shaft center relative to the unit in a plane perpendicular to the shafting. In the acquisition of vibration signals, the shaft center orbit graph is synthesized by two vibration displacement signals perpendicular to each other on the same shafting, and the equipment is detected and diagnosed through the obtained shaft center orbit graph).

[0005] However, this test method can only effectively test the shaft center orbit of a single-axis structure. For a dual-axis tester, since the inner shaft journal is wrapped by the outer shaft, the operating state of the inner shaft cannot be directly observed and measured during operation.

[0006] Therefore, it is necessary to design a new test method to synchronously measure the shaft center orbits of the inner and outer shafts during the simultaneous operation of the inner and outer shafts. Summary of the Invention

[0007] The purpose of this application is to provide a method and system for measuring the inner and outer shaft center orbits in a dual-axis mode to solve or mitigate at least one problem in the background technique.

[0008] The technical solution of this application is: A method for measuring the inner and outer shaft center orbits in a dual-axis mode, including:

[0009] On the circumference of the same axial position section of the outer shaft in the dual-axis shafting, n measurement holes are evenly distributed, where n is an integer multiple of 4. At the same time, a first laser displacement sensor and a second laser displacement sensor arranged vertically and horizontally are set at the axial positions adapting to the measurement holes in the dual-axis shafting;

[0010] When the inner shaft and the outer shaft rotate independently at the same time, when the light rays of the first laser displacement sensor and the second laser displacement sensor synchronously pass through the measurement holes on the outer shaft, are incident and return, the real-time horizontal and vertical displacements of the inner shaft in the two-shaft system are obtained, and the axis locus characteristics of the inner shaft are obtained according to the real-time displacements;

[0011] When the light rays of the first laser displacement sensor and the second laser displacement sensor simultaneously break away from the measurement holes on the outer shaft and cannot be incident and return from the outer shaft journal, the light rays of the first laser displacement sensor and the second laser displacement sensor are simultaneously incident on the surface of the outer shaft and return. At this time, the real-time distance displacements of the outer shaft in the horizontal and vertical directions are obtained, and the axis locus characteristics of the outer shaft are obtained according to the real-time displacements.

[0012] Further, the rotation speed ratio of the inner shaft to the outer shaft is not equal to an integer multiple of the number of measurement holes.

[0013] Further, the circumferential angle of the measurement holes provided on the outer shaft is α. During the time T when the outer shaft rotates one week, the time period T1 when the light rays of the first laser displacement sensor and the second laser displacement sensor synchronously pass through the measurement holes on the outer shaft, are incident and return satisfies: T1 = T·n·α / 360;

[0014] The time period T2 when the light rays of the first laser displacement sensor and the second laser displacement sensor are simultaneously incident on the surface of the outer shaft and return satisfies: T2 = T·(1 - n·α / 360).

[0015] Further, on the premise of ensuring the structural safety of the two-shaft system, the circumferential angle α of the measurement holes provided on the outer shaft is as large as possible.

[0016] On the other hand, the technical solution provided by the present application is: a measurement system for the axis locus of the inner and outer shafts in a two-shaft mode, adopting the measurement method for the axis locus of the inner and outer shafts in a two-shaft mode as described in any one of the above, and the measurement system includes:

[0017] A first laser displacement sensor, a second laser displacement sensor and a data processing device. The first laser displacement sensor and the second laser displacement sensor are arranged at the vertical position and the horizontal position of the axial position section with measurement holes on the outer shaft in the two-shaft system, and are used for measuring the vertical and horizontal real-time displacements of the inner shaft and / or the outer shaft;

[0018] A data processing device, which is connected to the first laser displacement sensor and the second laser displacement sensor, and is used for extracting the displacement data measured by the two laser displacement sensors within a predetermined time period, so as to obtain the real-time displacements of the inner shaft and the outer shaft from the first laser displacement sensor and the second laser displacement sensor, and finally obtain the axis locus characteristics of the inner shaft and the outer shaft.

[0019] The method and system for measuring the axial center trajectories of the inner and outer shafts under the double-axis mode provided by this application avoid the method of indirectly measuring the axial center trajectories of the inner and outer shafts by using vibration sensors, but can directly measure the axial center trajectories of the inner and outer shafts of the double-axis and double-duct tester, with high test accuracy. Brief Description of the Drawings

[0020] To more clearly illustrate the technical solutions provided by this application, the drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application.

[0021] Figure 1 Schematic diagram of the single-axis axial center trajectory test method in the prior art.

[0022] Figure 2 Schematic diagram of the inner shaft test state of the axial center trajectories of the inner and outer shafts in the double-axis mode of this application.

[0023] Figure 3 Schematic diagram of the outer shaft test state of the axial center trajectories of the inner and outer shafts in the double-axis mode of this application.

[0024] Reference Signs:

[0025] 21 - First laser displacement sensor

[0026] 22 - Second laser displacement sensor

[0027] 23 - Outer shaft

[0028] 24 - Inner shaft

[0029] 25 - Measurement hole Detailed Embodiments

[0030] To make the purpose, technical solutions, and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the drawings in the embodiments of this application.

[0031] To synchronously measure the axial center trajectory of the inner shaft during the operation of the double-axis shafting, realize real-time monitoring of the radial safety distance between the inner and outer shafts, and can directly and accurately measure and obtain the real-time operation state and axial center trajectory of the double-axis shafting of the inner and outer shafts at the same time, this application provides a method and system for measuring the axial center trajectories of the inner and outer shafts under the double-axis mode.

[0032] As Figure 2 and Figure 3 shown, the method for measuring the axial center trajectories of the inner and outer shafts under the double-axis mode provided by this application includes the following content:

[0033] 1) Set n measuring holes 25 in the circumferential direction of a cross-section at a certain axial position of the journal of the outer shaft 23 in a two-shaft system. Here, n is an integer multiple of 4 and the measuring holes 25 are evenly distributed in the circumferential direction. At the same time, set the first laser displacement sensor 21 and the second laser displacement sensor 22 arranged vertically and horizontally at the axial positions adapting to the measuring holes 25 in the two-shaft system;

[0034] 2) When the inner and outer shafts rotate independently at the same time, when the light rays of the first laser displacement sensor 21 and the second laser displacement sensor 22 just synchronously pass through the measuring holes 25 on the outer shaft 23 and are incident and return, the real-time distance states in the horizontal and vertical directions of the inner shaft 24 in the two-shaft system can be obtained; when the light rays of the first laser displacement sensor 21 and the second laser displacement sensor 22 simultaneously break away from the measuring holes 25 on the outer shaft 23 and cannot be incident and return from the journal of the outer shaft 23, the light rays of the first laser displacement sensor 21 and the second laser displacement sensor 22 are simultaneously incident on the surface of the outer shaft 23 and return. At this time, the real-time distance states in the horizontal and vertical directions of the outer shaft 23 can be obtained;

[0035] 3) The circumferential angle of a single measuring hole 25 on the outer shaft 23 is α. During the time T when the outer shaft 23 rotates one week, the first laser displacement sensor 21 and the second laser displacement sensor 22 will obtain the relevant displacement measurement data of the inner shaft 24 within the time period T1, and T1 = T·n·α / 360. By extracting the data within this time period T1, the real-time displacement value of the journal of the inner shaft 24 between the two laser displacement sensors can be obtained, and then the center orbit characteristics of the inner shaft 24 can be obtained;

[0036] At the same time, the relevant displacement measurement data of the outer shaft 23 within the time period T2 will be obtained synchronously, and T2 = T·(1 - n·α / 360). By extracting the data within this time period T2, the real-time displacement value of the journal of the outer shaft 23 between the two laser displacement sensors can be obtained, and then the center orbit characteristics of the outer shaft 23 can be obtained.

[0037] Finally, the real-time radial positions of the centers of the inner and outer shafts during the working process of the two-shaft system are realized, and the center orbit characteristics of the inner and outer shafts are obtained.

[0038] It should be noted that in the measurement method of this application, when the rotation speed ratio of the inner shaft 24 to the outer shaft 23 is equal to an integer multiple of the number n of the measuring holes 25, only the displacement change of the circumferentially fixed position points of the inner shaft 24 can be measured at this time, and the center orbit of the inner shaft 24 cannot be measured. Therefore, in this application, making the rotation speed ratio of the inner shaft 24 to the outer shaft 23 not equal to an integer multiple of the number n of the measuring holes 25 can obtain the center orbit data of the inner and outer shafts.

[0039] In a preferred embodiment of the present application, in order to obtain as much relevant displacement measurement data of the inner shaft 24 as possible within a single revolution period of the outer shaft 23, and on the premise of ensuring the structural safety of the dual-axis shafting, the circumferential angle α of the measurement hole 25 provided on the outer shaft 23 is made as large as possible.

[0040] In addition, the present application also provides an inner and outer shaft center orbit measurement system in a dual-axis mode. The measurement system includes: a first laser displacement sensor, a second laser displacement sensor, and a data processing device. The first laser displacement sensor and the second laser displacement sensor are arranged at the vertical and horizontal positions of the outer shaft with measurement holes in the dual-axis shafting. The data processing device is connected to the first laser displacement sensor and the second laser displacement sensor, and is used to extract the data measured by the two laser displacement sensors within a predetermined time period, so as to obtain the real-time displacement values between the journal of the inner and outer shafts and the two laser displacement sensors, and finally obtain the center orbit characteristics of the inner and outer shafts.

[0041] The inner and outer shaft center orbit measurement method and system provided by the present application avoid the method of indirectly measuring the inner and outer shaft center orbits by using vibration sensors, but can directly measure the inner and outer shaft center orbits of the dual-axis and dual-duct tester, and the test accuracy is high.

[0042] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for measuring the center locus of the inner and outer axes in a dual-axis mode, characterized in that Including: n measuring holes are evenly arranged in the circumferential direction of the cross-section at the same axial position of the outer shaft in the two-shaft system, where n is an integer multiple of 4. At the same time, a first laser displacement sensor and a second laser displacement sensor arranged vertically and horizontally are provided at the axial positions adapting to the measuring holes in the two-shaft system; When the inner shaft and the outer shaft rotate independently at the same time, when the light rays of the first laser displacement sensor and the second laser displacement sensor synchronously pass through the measuring holes on the outer shaft and are incident and returned, the real-time horizontal and vertical displacements of the inner shaft in the two-shaft system are obtained, and the center locus characteristics of the inner shaft are obtained according to the real-time displacements; When the light rays of the first laser displacement sensor and the second laser displacement sensor simultaneously deviate from the measuring holes on the outer shaft and cannot be incident and returned from the outer shaft journal, the light rays of the first laser displacement sensor and the second laser displacement sensor are simultaneously incident on the surface of the outer shaft and returned. At this time, the real-time distance displacements of the outer shaft in the horizontal and vertical directions are obtained, and the center locus characteristics of the outer shaft are obtained according to the real-time displacements.

2. The method for measuring the center trajectory of the inner and outer shafts in the biaxial mode according to claim 1, wherein The rotation speed ratio of the inner shaft to the outer shaft is not equal to an integer multiple of the number of measuring holes.

3. The method for measuring the center locus of the inner and outer shafts in the biaxial mode according to claim 1, wherein The circumferential angle of the measuring holes provided on the outer shaft is α. During the time T when the outer shaft rotates one week, the time period T1 when the light rays of the first laser displacement sensor and the second laser displacement sensor synchronously pass through the measuring holes on the outer shaft and are incident and returned satisfies: T1 = T·n·α / 360; The time period T2 when the light rays of the first laser displacement sensor and the second laser displacement sensor are simultaneously incident on the surface of the outer shaft and returned satisfies: T2 = T·(1 - n·α / 360).

4. The method for measuring the center locus of the inner and outer shafts in the biaxial mode according to claim 3, wherein, Under the condition of ensuring the structural safety of the two-shaft system, the circumferential angle α of the measuring holes provided on the outer shaft is as large as possible.

5. A measurement system for the inner and outer shaft center trajectories in a dual-axis mode, which adopts the measurement method for the inner and outer shaft center trajectories in a dual-axis mode as described in any one of claims 1 to 4, characterized in that, The measuring system includes: A first laser displacement sensor, a second laser displacement sensor and a data processing device. The first laser displacement sensor and the second laser displacement sensor are arranged at the vertical position and the horizontal position of the cross-section at the axial position with measuring holes on the outer shaft adapting to the two-shaft system, and are used for measuring the vertical and horizontal real-time displacements of the inner shaft and / or the outer shaft; A data processing device, which is connected to the first laser displacement sensor and the second laser displacement sensor, and is used for extracting the displacement data measured by the two laser displacement sensors within a predetermined time period, so as to obtain the real-time displacements of the inner shaft and the outer shaft from the first laser displacement sensor and the second laser displacement sensor, and finally obtain the center locus characteristics of the inner shaft and the outer shaft.

Images