CN111457841A - Continuous measuring method for runout of rotating body and centering measuring method for rotating body - Google Patents
Continuous measuring method for runout of rotating body and centering measuring method for rotating body Download PDFInfo
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- CN111457841A CN111457841A CN202010503339.9A CN202010503339A CN111457841A CN 111457841 A CN111457841 A CN 111457841A CN 202010503339 A CN202010503339 A CN 202010503339A CN 111457841 A CN111457841 A CN 111457841A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B11/272—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes using photoelectric detection means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
- G01B7/31—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B7/312—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention belongs to the technical field of measuring tools, and particularly relates to a continuous measuring method for runout of a rotating member and a centering measuring method for the rotating member, wherein the continuous measuring method comprises the following steps: the rotary member is mounted on the rotor support; a reflective tape is pasted on the rotating body; a photoelectric sensor and m eddy current sensors are arranged on one side of the revolving part; the photoelectric sensor and the eddy current sensor are connected with a vibration data acquisition instrument through signals; and rotating the rotating body part at a constant speed, and acquiring an output signal of the photoelectric sensor and an output signal of each eddy current sensor by the vibration data acquisition instrument, and converting the output signals of the eddy current sensors into a jitter value. The invention has the beneficial effects that: the continuous measuring method is simple, convenient and practical, has high efficiency, can simultaneously measure the run-out values of the rotating body parts along a plurality of axial radial cross sections, effectively evaluates whether the rotating body parts have bending deformation or not, can measure continuous data, and has comprehensive, accurate and high-efficiency measurement; the centering measurement method can determine the centering condition of the rotating elements when the rotating elements are connected.
Description
Technical Field
The invention belongs to the technical field of measuring tools, and particularly relates to a continuous measuring method for runout of a rotating member and a centering measuring method for the rotating member.
Background
The size of the runout value of the rotating element is always one of the conditions affecting the equipment precision of the mechanical industry, and the requirement of a steam turbine rotor such as a shaft part on the runout value is the highest. The steam turbine rotor is a core component of the whole steam turbine equipment, and the magnitude of the vibration value at the shaft neck of the steam turbine rotor is related to whether the whole steam turbine generator unit can operate safely for a long time. The radial run-out value of the rotor is a key index for inspecting the bending condition of the rotor and judging whether the connection of the two rotors is in alignment.
The main measuring method of the prior rotating body part is to utilize a dial indicator to measure the runout values of a plurality of positions of the rotor in the circumferential direction, the accuracy of the measuring result is influenced by the error of manual reading, the flexibility of a dial indicator transmission machine, the effectiveness of the dial indicator, the position selection of the measuring data and the like, the manual detection efficiency is low, and the measurement is only single measurement in a static state; in the existing measuring method, only 8 measuring points are selected in the circumferential direction of the rotor for static measurement, and the circumferential runout change condition of the rotor cannot be continuously reflected. The same problem exists for other types of rotary members.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention aims to provide a continuous measurement method for measuring the runout of a rotating body, which is used for solving the problems that in the prior art, the accuracy of the measurement result is affected by the error of manual reading, the flexibility of a dial indicator transmission machine, the effectiveness of the dial indicator, the selection position of the measurement data, etc., the manual detection efficiency is low, and the measurement is only a single measurement in a static state; in the existing measuring method, a plurality of measuring points are selected in the circumferential direction of the rotating member for static measurement, and the circumferential runout change condition of the rotating member cannot be continuously reflected.
To achieve the above and other related objects, the present invention provides a continuous measurement method for runout of a rotary member, comprising the steps of:
s1, the rotary piece is rotatably arranged on the rotor support.
S2, pasting a light reflecting belt on the outer circular surface of any position of the rotating body piece; a photoelectric sensor is configured on one side of the rotary member in a non-contact mode, a signal sending surface and a signal receiving surface of the photoelectric sensor are arranged right opposite to the light reflecting belt, and a gap is reserved between the photoelectric sensor and the light reflecting belt.
S3, configuring m eddy current sensors on one side of the rotating body in a non-contact mode, selecting m detection sections perpendicular to the central axis of the rotating body on the rotating body, enabling the central axes of induction coils of the eddy current sensors to be located on the detection sections in a one-to-one correspondence mode, enabling the central axis of the induction coil of each eddy current sensor to extend to the central axis of the rotating body in parallel, and enabling a gap to be reserved between each eddy current sensor and the outer circular surface of the rotating body.
Preferably, the rotating body is a turbine rotor, and m is 5. The 5 detection sections are respectively the end positions (A, B) at the two ends, the position (C, D) of the two journals and the position (E) at which the deflection of the middle of the rotor is maximum. The arrangement angles of all the eddy current sensors are required to be consistent, and the eddy current sensors can be horizontally arranged or vertically arranged.
And S4, connecting signals of the photoelectric sensor and the eddy current sensor to a vibration data acquisition instrument.
S5, rotating the rotating body part at a constant speed, collecting output signals of the photoelectric sensor by using a vibration data collector, and taking a time period of two adjacent output signals of the photoelectric sensor as a rotation period; and setting the rotation period as the sampling interval time of the vibration data acquisition instrument, continuously rotating the rotating member at a constant speed, and converting the output signal of each acquired eddy current sensor into a jitter value by the vibration data acquisition instrument in each rotation period.
Preferably, the photoelectric sensor and the eddy current sensor can be mounted on the rotor support, and can also be mounted on other independent sensor supports.
Specifically, in step S4, the following operations may be further performed: 1) cleaning the outer circular surface of the detected section of the rotary part, and increasing the smoothness of the detected surface so as to improve the precision of signal acquisition; 2) the distance between each eddy current sensor and the rotating body is adjusted to a signal output state, so that the output signal is more stable.
The head of the eddy current sensor is provided with an induction coil, and the direct current voltage value in the output signal of the sensor is in direct proportion to the gap between the induction coil and the surface of the rotating body. For example, for an eddy current sensor with a sensitivity of 8V/mm, the distance between the sensor and the rotor surface should be adjusted to 1.25mm, i.e. the gap voltage is-10V, so that the linear relationship between the change of the gap between the sensor and the rotor surface after the rotor rotates and the output voltage of the sensor can be ensured.
The continuous measuring method for the runout of the rotating body part is simple, convenient and practical, has high efficiency, can simultaneously measure the runout value of the rotating body part along a plurality of radial cross sections in the axial direction, can effectively evaluate whether the rotating body part has bending deformation or not, and has more comprehensive and accurate results compared with the data measured by the traditional measuring method by utilizing a mechanical measuring tool; the reliability of the on-line measurement process is high, and powerful support can be provided for diagnosis and treatment of subsequent problems; the existing measuring method can only measure a single section and is limited by measuring space.
The continuous measuring method for the runout of the rotating member has the advantages of accurate and reliable data, high precision (0.01-0.1 micrometer), and the precision of a dial indicator used by the existing measuring method is 1 micrometer.
The continuous measurement method for the jumping of the rotary member can quickly position the position with the largest jumping, and provides powerful support for diagnosis and treatment of subsequent problems.
S6, if the rotation period is n, in α rotation period, the maximum jumping values measured by the vibration data acquisition instrument through each eddy current sensor are 1 α∠ theta 1 and 2 α∠ theta 2 … … m α∠ theta m respectively, wherein n is a positive integer, α is an integer from 1 to n, ∠ theta 1 and ∠ theta 2 … … ∠ theta m are the circumferential azimuth angles of the rotary member corresponding to the maximum jumping values in each detection section, the n maximum jumping values on each detection section are subjected to arithmetic mean calculation, and the maximum jumping mean value on each detection section is obtained
Wherein m α∠ θ m indicates the rotary member in the α th rotation cycleMaximum runout value at circumferential azimuth ∠ θ m the present invention is more accurate by arithmetic mean calculation.
Further, in step S2, before the reflective tape is attached, the surface of the rotating member to be attached is cleaned, so that the reflective surface of the reflective tape is prevented from being concave and convex, and the accuracy of the photoelectric sensing is not affected.
Further, in step S5, after the rotating member rotates at a constant speed for a period of time, the vibration data acquisition instrument acquires the output signal of the eddy current sensor. Preferably, the rotating body is rotated at 150 rpm-700 rpm for a period of time before being measured in order to avoid possible influences by temporary bending of the rotating shaft.
Preferably, the vibration data acquisition instrument outputs the acquired signal of the photoelectric sensor and the acquired signal of the eddy current sensor to a computer, and the computer displays the data. And displaying a jitter value waveform curve on each detection section on a computer, recording a circumferential azimuth angle of a maximum jitter value position of each detected section, and recording the maximum jitter value of each detected section. The computer can display the numerical value instantly and record the change curve chart of the jumping value of the rotary member along with the time.
The data measured by the continuous measuring method for the runout of the rotating member has continuity, and the variation trend of the runout of the whole circumferential direction of the rotating member can be intuitively reflected. In the existing measurement method, only 8 measurement points are selected in the circumferential direction of the rotating member to perform static measurement one by one, the circumferential runout change condition of the rotating member cannot be continuously reflected, and a rectangular coordinate curve reflected on a computer cannot be formed.
The computer can be replaced by a plotter, and can directly plot the jumping value change curve chart and the cycle curve chart of the rotating body.
Further, the rotor support is replaced with a lathe. In a lathe, the rotating body part can be installed through the center, the rotation is more stable, and the axial movement cannot be generated.
Preferably, the vibration data acquisition instrument is a Bentley 408 vibration data acquisition instrument, is simple to operate, has 24-32 dynamic channels, can cooperatively receive dynamic waveform input and/or static input of a plurality of channels, and is convenient to purchase and high in precision.
In addition, similarly, a method of centering a rotating member includes the steps of:
p1, connecting the two rotating parts into a coaxial assembly through a coupler and a bolt, and then rotatably mounting the coaxial assembly on the rotor bracket;
p2, pasting a reflective belt on the outer circular surface of any position of the coaxial assembly; a photoelectric sensor is configured on one side of the coaxial assembly in a non-contact manner, a signal sending surface and a signal receiving surface of the photoelectric sensor are arranged right opposite to the reflective belt, and a gap is reserved between the photoelectric sensor and the reflective belt;
p3, configuring two eddy current sensors on one side of the coaxial assembly in a non-contact manner, selecting a detection section perpendicular to the central axis of the coaxial assembly on each of the two flanges of the coupler, wherein the central axes of the induction coils of the eddy current sensors are correspondingly positioned on the detection sections one by one, the central axis of the induction coil of each eddy current sensor extends to the central axis of the coaxial assembly in parallel, and a gap is reserved between each eddy current sensor and the flange;
the P4, the photoelectric sensor and the eddy current sensor are connected with a vibration data acquisition instrument through signals;
p5, rotating the coaxial assembly at a constant speed, collecting the output signal of the photoelectric sensor by the vibration data collector, taking the time period of two adjacent output signals of the photoelectric sensor as a rotation period, setting the rotation period as the sampling interval time of the vibration data collector, continuing to rotate the coaxial assembly at the constant speed, converting the collected output signal of each eddy current sensor into a jitter value by the vibration data collector in each rotation period, continuously measuring n rotation periods, wherein the maximum jitter values sequentially measured by the vibration data collector through each eddy current sensor in α rotation period are 1 α∠ theta 1 and 2 α∠ theta 2 respectively, wherein α is an integer from 1 to n, ∠ theta 1 and ∠ theta 2 are circumferential azimuth angles corresponding to the maximum jitter values in each detection section, and performing arithmetic mean calculation on the n maximum jitter values on each detection section to obtain the maximum jitter values on the two detection sectionsMean value of jitter
And
set a pair of intermediate criteria β if
And
if the two rotating parts are smaller than the centering standard value β, the centering of the two rotating parts is judged to be qualified, otherwise, the centering is not judged to be qualified.
Specifically, in step P4, the following operations may also be performed: 1) cleaning the outer circular surface of the detected section of the coaxial assembly, and increasing the smoothness of the detected surface so as to improve the precision of signal acquisition; 2) the distance between each eddy current sensor and the rotating body is adjusted to a signal output state, so that the output signal is more stable.
The principle of the measuring method for centering the rotating member is the same as that of a continuous measuring method for jumping of the rotating member, and the number of the rotors in the measuring method for centering the rotating member can be not only two, but also more than two.
The vibration data acquisition instrument outputs the acquired signals of the photoelectric sensor and the eddy current sensor to the computer, and the computer displays data. And displaying a jitter value waveform curve on each detection section on a computer, recording a circumferential azimuth angle of a maximum jitter value position of each detected section, and recording the maximum jitter value of each detected section. The computer can display the numerical value instantly and record the change curve chart of the jumping value of the rotary member along with the time.
The computer can be replaced by a plotter, and can directly plot the jumping value change curve chart and the cycle curve chart of the rotating body.
In conclusion, the invention provides a method which is accurate, reliable, efficient and capable of continuously measuring the run-out value of the rotating body member, so that whether the run-out value of the rotating body member meets the standard or not can be verified in the production process of the rotating body member, and whether the rotating body member has bending deformation or not can be effectively evaluated; and after the rotary part has a fault that the vibration exceeds the standard, reference is provided for analysis of the reason on a computer for displaying data, the accuracy of fault diagnosis is improved, and the running safety of the rotary part is improved. The rotating member centering measuring method can determine whether the centering condition of the rotating members meets the requirement or not when a plurality of rotating members are connected.
As mentioned above, the continuous measurement method for runout of a rotating body of the present invention has at least the following advantages:
1. the continuous measuring method for the runout of the rotating body part is simple, convenient and practical, has high efficiency, can simultaneously measure the runout value of the rotating body part along a plurality of radial cross sections in the axial direction, effectively evaluates whether the rotating body part has bending deformation or not, and has more comprehensive and accurate results compared with the data measured by the traditional measuring method by utilizing a mechanical measuring tool; the method has high reliability in the on-line measurement process, and can provide powerful support for diagnosis and treatment of subsequent problems.
2. The data measured by the continuous measuring method for the runout of the rotating member has continuity, and the variation trend of the runout of the whole circumferential direction of the rotating member can be intuitively reflected.
3. The continuous measuring method for the runout of the rotating member has the advantages of accurate and reliable data, high precision (0.01-0.1 micrometer), and the precision of a dial indicator used by the existing measuring method is 1 micrometer.
4. The continuous measurement method for the jumping of the rotary member can quickly position the position with the largest jumping, and provides powerful support for diagnosis and treatment of subsequent problems.
In addition, the rotating member centering measurement method applied to the rotating member run-out continuous measurement method has at least the following beneficial effects: whether the centering condition of the rotating parts meets the requirement or not can be determined when the plurality of rotating parts are connected.
Drawings
Fig. 1 is a schematic view of a measuring apparatus for continuous measurement of the runout of a rotary member to which the present invention is applied.
FIG. 2 is a graph of rotor runout at different test cross-sections over a plurality of successive cycles during rotation of the rotor as shown on the display of the computer of FIG. 1.
Fig. 3 is a schematic view of the mounting structure of the eddy current sensor and the coupling in the rotating member centering measurement method of the present invention.
Fig. 4 is a schematic view of a circumferential azimuth angle ∠ θ m indicated on a detection cross section in the continuous measurement method of the runout of rotating bodies of the present invention.
Description of reference numerals:
1. a rotating body member;
2. a rotor support;
3. a reflective band;
4. a photosensor;
5. an eddy current sensor;
6. a vibration data acquisition instrument;
7. a computer;
8. a coupling is provided.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
An embodiment of the present invention, shown in fig. 1 and 2, for continuous measurement of the runout of a rotating body member, comprises the steps of:
s1, the rotary body part 1 is rotatably arranged on the rotor bracket 2.
S2, attaching a reflective belt 3 to the outer circular surface of any position of the rotating body part 1; a photoelectric sensor 4 is configured on one side of the revolving body 1 in a non-contact mode, a signal sending surface and a signal receiving surface of the photoelectric sensor 4 are arranged right opposite to the reflective belt 3, and a gap is reserved between the photoelectric sensor 4 and the reflective belt 3.
S3, configuring m eddy current sensors 5 on one side of the rotating body part 1 in a non-contact mode, selecting m detection cross sections perpendicular to the central axis of the rotating body part 1 on the rotating body part 1, wherein the central axes of induction coils of the eddy current sensors 5 are located on the detection cross sections in a one-to-one correspondence mode, the central axis of the induction coil of each eddy current sensor 5 extends to the central axis of the rotating body part 1 in parallel, and a gap is reserved between each eddy current sensor 5 and the outer circular surface of the rotating body part 1.
Preferably, the rotating body 1 is a turbine rotor, and m is 5. As shown in fig. 1, the 5 detection sections are the end positions at both ends (A, B), the two journal positions (C, D), and the position (E) at which the rotor center deflection is maximum. The arrangement angles of all the eddy current sensors 5 must be kept consistent, and the eddy current sensors can be horizontally arranged or vertically arranged.
And S4, the photoelectric sensor 4 and the eddy current sensor 5 are in signal connection with the vibration data acquisition instrument 6.
S5, rotating the rotating body part 1 at a constant speed, and collecting output signals of the photoelectric sensor 4 by the vibration data collector 6, wherein the time period of two adjacent output signals of the photoelectric sensor 4 is taken as a rotation period; and setting the rotation period as the sampling interval time of the vibration data acquisition instrument 6, continuously rotating the rotating body part 1 at a constant speed, and converting the acquired output signal of each eddy current sensor 5 into a jitter value by the vibration data acquisition instrument 6 in each rotation period.
The photoelectric sensor 4 and the eddy current sensor 5 can be mounted on the rotor holder 2, or can be mounted on a separate sensor holder.
Specifically, in step S4, the following operations may be further performed: 1) cleaning the outer circular surface of the detected section of the rotary part 1, and increasing the smoothness of the detected surface to improve the accuracy of signal acquisition; 2) the distance between each eddy current sensor 5 and the rotating body 1 is adjusted to a signal output state, so that the output signal is more stable.
Wherein, the head of the eddy current sensor 5 is provided with an induction coil, and the direct current voltage value in the output signal of the sensor is in direct proportion to the clearance between the induction coil and the surface of the revolving member 1. For example, for an eddy current sensor 5 with a sensitivity of 8V/mm, as shown in FIG. 1, the distance between the sensor and the rotor surface should be adjusted to 1.25mm, i.e., the gap voltage should be-10V, so that the linear relationship between the change of the gap between the sensor and the rotor surface and the output voltage of the sensor can be ensured after the rotor rotates.
The continuous measuring method for the runout of the rotating body part is simple, convenient and practical, has high efficiency, can simultaneously measure the runout value of the rotating body part 1 along a plurality of radial cross sections in the axial direction, can effectively evaluate whether the rotating body part 1 has bending deformation or not, and has more comprehensive and accurate results compared with the data measured by the traditional measuring method by utilizing a mechanical measuring tool; the on-line measurement process of the embodiment has high reliability, and can provide powerful support for diagnosis and treatment of subsequent problems; the existing measuring method can only measure a single section and is limited by measuring space.
The continuous measuring method for the runout of the rotating member in the embodiment has the advantages that the obtained data are accurate and reliable, the precision is high (0.01-0.1 micrometer), and the precision of a dial indicator used by the existing measuring method is 1 micrometer.
The continuous measurement method for the jumping of the rotary member can quickly locate the position with the largest jumping, and provides powerful support for diagnosis and treatment of subsequent problems.
S6, if the rotation period is n, in α rotation period, the maximum run-out values measured by the vibration data acquisition instrument 6 through the eddy current sensors 5 are 1 α∠ theta 1 and 2 α∠ theta 2 … … m α∠ theta m respectively, wherein n is a positive integer, α is an integer from 1 to n, ∠ theta 1 and ∠ theta 2 … … ∠ theta m are the circumferential azimuth angle of the rotor 1 corresponding to the maximum run-out value in each detection section, the n maximum run-out values on each detection section are arithmetically calculated, and the average value of the maximum run-out values on each detection section is obtained
Where m α∠ θ m represents the maximum run-out value of the rotating member 1 at the circumferential azimuth ∠ θ m in the α th rotation cycle, and the circumferential azimuth represented on the inspection cross-section by ∠ θ m as shown in fig. 4, where the position of the light-reflecting belt 3 is 0 °, the rotating member 1 rotates clockwise.
Further, in step S2, before the reflective tape 3 is attached, the surface to be attached of the rotating member 1 is cleaned, so that the reflective surface of the reflective tape 3 is prevented from being concave and convex, and the accuracy of the photoelectric sensing is not affected.
Further, in step S5, after the rotating member 1 rotates at a constant speed for a period of time, the vibration data acquisition instrument 6 acquires the output signal of the eddy current sensor 5. Preferably, the rotating body 1 is measured after a period of rotation at 150-700 rpm, in order to avoid possible influences by temporary bending of the rotating shaft.
Preferably, the vibration data collector 6 outputs the collected signal of the photoelectric sensor 4 and the signal of the eddy current sensor 5 to the computer 7, and the computer 7 displays the data. And displaying a jitter value waveform curve on each detection section on the computer 7, recording the circumferential azimuth angle of the maximum jitter value position of each detected section, and recording the maximum jitter value of each detected section. The computer 7 can display the numerical value in real time and record the change curve of the jumping value of the rotating body member 1 along with the time, the curve A-E shown in figure 2 represents the change curve of the jumping value of the rotating body member 1 measured on each detection section, and the curve 0 represents the cycle curve of photoelectric induction.
The data measured by the continuous measuring method for the runout of the rotating body member in the embodiment has continuity, and the variation trend of the runout of the rotating body member 1 in the whole circumferential direction can be intuitively reflected. In the existing measurement method, only 8 measurement points are selected in the circumferential direction of the rotating member 1 to perform static measurement one by one, the circumferential runout change condition of the rotating member 1 cannot be continuously reflected, and a rectangular coordinate curve reflected on a computer cannot be formed.
In another embodiment, the computer 7 may be replaced by a plotter, which may directly plot the variation curve of the run-out value and the cycle curve of the rotary member 1.
Further, the rotor holder 2 is replaced with a lathe. In a lathe, the rotating body part 1 can be installed through the center, the rotation is more stable, and the axial movement cannot be generated.
Preferably, the vibration data acquisition instrument 6 is the bentley 408 vibration data acquisition instrument 6, the operation is simple, the number of the 24-32 dynamic channels is provided, the dynamic waveform input and/or the static input of a plurality of channels can be cooperatively received, the purchase of the instrument is convenient, and the precision is high.
In addition, similarly, a method of centering a rotating member includes the steps of:
p1, connecting the two rotating parts 1 into a coaxial assembly through a coupler 8 and a bolt, and then rotatably mounting the coaxial assembly on the rotor bracket 2;
p2, pasting the outer circular surface of any position of the coaxial assembly on the reflective belt 3; a photoelectric sensor 4 is configured on one side of the coaxial assembly in a non-contact mode, a signal sending surface and a signal receiving surface of the photoelectric sensor 4 are arranged right opposite to the reflective belt 3, and a gap is reserved between the photoelectric sensor 4 and the reflective belt 3;
p3, as shown in fig. 3, two eddy current sensors 5 are configured on one side of the coaxial assembly in a non-contact manner, a detection section perpendicular to the central axis of the coaxial assembly is selected on each of the two flanges of the coupling 8, the central axes of the induction coils of the eddy current sensors 5 are located on the detection section in a one-to-one correspondence manner, the central axis of the induction coil of each eddy current sensor 5 extends to the central axis of the coaxial assembly in parallel, and a gap is left between each eddy current sensor 5 and the flange;
the P4, the photoelectric sensor 4 and the eddy current sensor 5 are all connected to the vibration data acquisition instrument 6 through signals;
p5, rotating the coaxial assembly at a constant speed, acquiring the output signal of the photoelectric sensor 4 by the vibration data acquisition instrument 6, taking the time period of two adjacent output signals of the photoelectric sensor 4 as a rotation period, setting the rotation period as the sampling interval time of the vibration data acquisition instrument 6, continuing to rotate the coaxial assembly at the constant speed, converting the acquired output signal of each eddy current sensor 5 into a jitter value by the vibration data acquisition instrument 6 in each rotation period, continuously measuring n rotation periods, wherein the maximum jitter values sequentially measured by the vibration data acquisition instrument 6 through each eddy current sensor 5 in α rotation periods are 1 α∠ theta 1 and 2 α∠ theta 2 respectively, wherein α is an integer from 1 to n, ∠ theta 1 and ∠ theta 2 are circumferential azimuth angles corresponding to the maximum jitter values in each detection section, performing arithmetic mean calculation on the n maximum jitter values on each detection section, and obtaining the maximum average jitter value on the two detection sections
And
set a pair of intermediate criteria β if
And
if the two values are less than the centering standard value β, the centering of the two rotating parts 1 is judged to be qualified, otherwise, the centering is not judged to be qualified.
Specifically, in step P4, the following operations may also be performed: 1) cleaning the outer circular surface of the detected section of the coaxial assembly, and increasing the smoothness of the detected surface so as to improve the precision of signal acquisition; 2) the distance between each eddy current sensor 5 and the rotating body 1 is adjusted to a signal output state, so that the output signal is more stable.
The principle of the measuring method for centering the rotating member in the embodiment is the same as that of the continuous measuring method for the runout of the rotating member, and the number of the rotors in the measuring method for centering the rotating member 1 in the embodiment can be not only two, but also more than two.
The vibration data acquisition instrument 6 outputs the acquired signal of the photoelectric sensor 4 and the acquired signal of the eddy current sensor 5 to the computer 7, and the computer 7 displays data. And displaying a jitter value waveform curve on each detection section on the computer 7, recording the circumferential azimuth angle of the maximum jitter value position of each detected section, and recording the maximum jitter value of each detected section. The computer 7 can display the numerical value instantly and record the change curve chart of the jumping value of the revolving body 1 along with the time.
In another embodiment, the computer 7 may be replaced by a plotter, which may directly plot the variation curve of the run-out value and the cycle curve of the rotary member 1.
In conclusion, the embodiment provides a method for accurately, reliably, efficiently and continuously measuring the run-out value of the rotating body member 1, so that whether the run-out value of the rotating body member 1 meets the standard or not can be verified in the production process of the rotating body member 1, and whether the rotating body member 1 has bending deformation or not can be effectively evaluated; and after the rotary part 1 has a fault that the vibration exceeds the standard, a reference is provided for the analysis of the reason on the computer 7 for displaying data, the accuracy of fault diagnosis is improved, and the running safety of the rotary part 1 is improved. The rotating member centering measurement method of the present embodiment can determine whether the centering of the rotating member 1 is satisfactory or not when a plurality of rotating members 1 are connected.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. A continuous measurement method for runout of a rotating body, comprising the steps of:
rotatably mounting the rotor member to the rotor frame;
attaching a reflective belt to the outer circular surface of any position of the rotary member; a photoelectric sensor is configured on one side of the revolving body in a non-contact mode, a signal sending surface and a signal receiving surface of the photoelectric sensor are arranged right opposite to the light reflecting belt, and a gap is reserved between the photoelectric sensor and the light reflecting belt;
the method comprises the following steps that m eddy current sensors are configured on one side of a rotary part in a non-contact mode, m detection sections perpendicular to the central axis of the rotary part are selected on the rotary part, the central axes of induction coils of the eddy current sensors are correspondingly located on the detection sections one by one, the central axes of the induction coils of the eddy current sensors extend to the central axis of the rotary part in parallel, and a gap is reserved between the eddy current sensors and the outer circular surface of the rotary part;
the photoelectric sensor and the eddy current sensor are connected with a vibration data acquisition instrument through signals;
rotating the rotating body at a constant speed, wherein the vibration data acquisition instrument acquires output signals of the photoelectric sensor, and the time period of two adjacent output signals of the photoelectric sensor is taken as a rotation period; and setting the rotation period as the sampling interval time of the vibration data acquisition instrument, and continuously rotating the rotating body at a constant speed, wherein in each rotation period, the vibration data acquisition instrument converts the acquired output signal of each eddy current sensor into a jitter value.
2. The continuous measuring method of the runout of the rotary body parts as claimed in claim 1, further comprising the steps of measuring the maximum runout values of said vibration data collecting instrument sequentially measured by each eddy current sensor in α th rotation period respectively as 1 α∠ θ 1 and 2 α∠ θ 2 … … m α∠ θ m, wherein n is a positive integer, α is an integer from 1 to n, and ∠ θ 1 and ∠ θ 2 … … ∠ θ m are sequentially used for each detection cutoffThe circumferential azimuth angle of the rotating member corresponding to the maximum run-out value in the plane; carrying out arithmetic mean calculation on the n maximum jitter values on each detection section, and obtaining the maximum jitter average value on each detection section
3. The continuous measurement of rotary member run-out of claim 1, wherein: before the reflective tape is pasted, the surface to be pasted of the rotary part is cleaned.
4. The continuous measurement of rotary member run-out of claim 1, wherein: and after the rotating piece rotates for a period of time at a constant speed, the vibration data acquisition instrument acquires the output signal of the eddy current sensor.
5. The continuous measurement of rotary member run-out of claim 1, wherein: the vibration data acquisition instrument outputs the acquired signals of the photoelectric sensor and the acquired signals of the eddy current sensor to a computer, and the computer displays data.
6. Continuous measurement of the runout of rotating bodies according to any of claims 1-5, characterized in that: the rotor support is replaced by a lathe.
7. A method of centering a rotating member, comprising the steps of:
connecting the two rotating parts into a coaxial assembly through a coupler and a bolt, and then rotatably mounting the coaxial assembly on the rotor bracket;
attaching a reflective tape to the outer circular surface of any position of the coaxial assembly; configuring a photoelectric sensor on one side of a coaxial assembly in a non-contact manner, wherein a signal sending surface and a signal receiving surface of the photoelectric sensor are arranged right opposite to a reflective belt, and a gap is reserved between the photoelectric sensor and the reflective belt;
the method comprises the following steps that two eddy current sensors are configured on one side of a coaxial assembly in a non-contact mode, a detection section perpendicular to the central axis of the coaxial assembly is selected from two flanges of a coupler, the central axes of induction coils of the eddy current sensors are located on the detection section in a one-to-one correspondence mode, the central axis of the induction coil of each eddy current sensor extends to the central axis of the coaxial assembly in parallel, and a gap is reserved between each eddy current sensor and the corresponding flange;
the photoelectric sensor and the eddy current sensor are connected with a vibration data acquisition instrument through signals;
the method comprises the steps of rotating a coaxial assembly at a constant speed, setting a rotation period as sampling interval time of a vibration data acquisition instrument, continuing to rotate the coaxial assembly at the constant speed, converting the acquired output signal of each eddy current sensor into a jitter value by the vibration data acquisition instrument in each rotation period, continuously measuring n rotation periods, wherein the maximum jitter values sequentially measured by the vibration data acquisition instrument through the eddy current sensors in α rotation periods are respectively 1 α∠ theta 1 and 2 α∠ theta 2, α is an integer from 1 to n, ∠ theta 1 and ∠ theta 2 are circumferential azimuth angles corresponding to the maximum jitter values in each detection section, carrying out arithmetic mean calculation on the n maximum jitter values on each detection section, and obtaining the maximum jitter average value on the two detection sections
And
set a pair of intermediate criteria β if
And
if the two rotating parts are smaller than the centering standard value β, the centering of the two rotating parts is judged to be qualified, otherwise, the centering is not judged to be qualified.
8. The rotary member centering measurement method of claim 7, wherein: the vibration data acquisition instrument outputs the acquired signals of the photoelectric sensor and the acquired signals of the eddy current sensor to a computer, and the computer displays data.
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Application publication date: 20200728 |