CN113639625A - Dynamic testing system for seat ring clearance of large-scale rotating machinery - Google Patents
Dynamic testing system for seat ring clearance of large-scale rotating machinery Download PDFInfo
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- CN113639625A CN113639625A CN202110797856.6A CN202110797856A CN113639625A CN 113639625 A CN113639625 A CN 113639625A CN 202110797856 A CN202110797856 A CN 202110797856A CN 113639625 A CN113639625 A CN 113639625A
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- eddy current
- scale rotating
- current sensor
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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
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
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Abstract
The invention provides a dynamic testing system for a large-scale rotating machine seat ring gap, wherein an eddy current sensor is arranged on an upper seat ring of a large-scale rotating machine, a data acquisition instrument is used for acquiring output signals of the eddy current sensor, and the acquired data are transmitted to an upper computer for real-time display and analysis, and the testing method comprises the following steps: installing an eddy current sensor for measuring the axial displacement and the radial displacement of the large-scale rotating mechanical seat ring; calibrating the eddy current sensor by adopting a two-point calibration method; setting parameters of a data acquisition system, including channel parameters, bridge voltage, sensitivity, measurement quantity, sampling frequency, balance zero clearing and a filtering mode; starting to collect, displaying the waveform of the data in real time, and storing the waveform data and the picture; and (4) performing spectrum analysis on the waveform by taking the time period needing to be analyzed as an abscissa and the measurement gap value as an ordinate. The invention can dynamically measure the clearance of the large-scale rotating machinery seat ring with high precision, and has the functions of power-on self-starting, power-on self-checking, real-time monitoring of the running state and the like.
Description
Technical Field
The invention relates to a dynamic measurement technology of large-scale rotating machinery, in particular to a dynamic clearance measurement system of a large-scale rotating machinery seat ring.
Background
The large-scale rotating machine seat ring is a connecting part of the large-scale rotating machine and the vehicle body, and can support the large-scale rotating machine and enable the large-scale rotating machine to rotate in the 360-degree direction under the driving of the steering gear. The large-scale rotating mechanical race can be regarded as a large-scale radial ball bearing, the ball of the bearing can support the upper race and drive the large-scale rotating mechanical system to flexibly rotate in the raceway of the lower race, the balls are mutually independent and continuously contact and collide with the upper race and the lower race. In practical conditions, due to abrasion in a machining process and a using process, gaps exist between the upper and lower races and the balls, the balls slightly collide with the upper and lower races in the raceway, and collision contact forces exist between the balls and the upper and lower races. In the working process of the large-scale rotating machinery, huge transient impact is generated between the upper and lower races and the balls of the large-scale rotating machinery. The upper and lower races are simultaneously subjected to axial force, radial force and overturning moment, so that a gap is formed between the upper and lower races. The non-linearity of the race clearance, in turn, affects the stability of the normal operation. Therefore, the clearance characteristic of the raceway of a large rotary machine is very important for the study of the large rotary machine. However, large rotating machines are bulky, have a complex and narrow internal space, and the measuring device is often operated in harsh environments such as severe impact vibration and dirt and oil contamination. Therefore, it is highly desirable to provide a dynamic clearance measurement system for a race of a large-scale rotating machine, which dynamically measures the change of the clearance of the race of the large-scale rotating machine and simultaneously meets the requirements of the large-scale rotating machine on complicated structure, narrow space and strong impact.
Disclosure of Invention
The invention aims to provide a dynamic clearance measuring system for a large rotating mechanical seat ring.
The technical solution for realizing the purpose of the invention is as follows: the utility model provides a large-scale rotating machinery seat ring clearance dynamic test system, at large-scale rotating machinery upper race installation eddy current sensor, utilizes the data acquisition appearance to gather eddy current sensor's output signal to the data of will gathering are passed through the giga net and are given host computer real-time demonstration and analysis, and its rotating machinery seat ring clearance dynamic test's concrete step is:
step one, beating 3 upper seat rings
The through holes are spaced by 120 degrees and are used for installing the eddy current sensor to measure the axial displacement of the large-scale rotating machinery seat ring, 3 installing supports are welded on the large-scale rotating machinery upper seat ring, and 3 installing supports are arranged on the supports
The position of the through hole is consistent with the position of the eddy current for measuring the axial gap, and the through hole is used for installing an eddy current sensor to measure the radial displacement of the large-scale rotating mechanical seat ring;
step two, calibrating the eddy current sensor by adopting a two-point calibration method, firstly, giving out determined two-point displacement values X1 and X2 by using a feeler gauge, and acquiring corresponding two-point output voltage values V1 and V2 by using a data acquisition system to further obtain the sensitivity of the eddy current sensor: s ═ (V1-V2)/(X1-X2);
setting parameters of a data acquisition system, including channel parameters, bridge voltage, sensitivity, measurement quantity, sampling frequency, balance zero clearing and a filtering mode;
step four, starting to collect, displaying the waveform of the data in real time, and storing the waveform data and the picture;
and step five, performing spectrum analysis on the waveform by taking the time period needing to be analyzed as an abscissa and taking the measurement gap value as an ordinate.
Further, the eddy current displacement sensor selects HZ-891 XL.
Further, the data acquisition instrument selects a domestic Donghua DH5922D data acquisition system.
Furthermore, the output line of the eddy current sensor and the input line of the data acquisition channel are welded on an aviation plug panel of the main control box, and a universal meter is used for measuring the conduction condition.
Further, the intelligent control device further comprises an industrial personal computer, a temperature control detection control module and a temperature control module, wherein the industrial personal computer, the eddy current sensor pre-processor and the temperature control detection control module are fixedly installed in the main control box, the data acquisition system and the temperature control module are installed in the digital acquisition box, and the two boxes are respectively provided with a processing panel for aerial insertion installation and channel acquisition line connection.
Furthermore, the main control box and the data acquisition box adopt a damping design.
Furthermore, a voltage stabilizing module is additionally arranged, and a power supply outputs a stable voltage after passing through the voltage stabilizing module to supply power to the data acquisition system and the industrial personal computer.
Compared with the prior art, the invention has the following remarkable advantages: the clearance of the large-scale rotating machinery seat ring can be dynamically measured with high precision, and the device has the functions of power-on self-starting, power-on self-checking, real-time monitoring of the running state and the like. The system is portable and easy to operate, and meanwhile, the test system can also be applied to other occasions of dynamic displacement measurement in high-precision complex environments, and has a great application prospect.
Drawings
FIG. 1 is a schematic diagram of the system testing of the present invention.
Fig. 2 is a diagram illustrating an eddy current sensor mounting method according to the present invention.
FIG. 3 is a graph of the test results of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The eddy current sensor has the advantages of good long-term working reliability, wide measuring range, high sensitivity, strong anti-interference capability, non-contact measurement, high response speed, no influence of media such as oil and water and the like, and is widely applied to the on-line monitoring and fault diagnosis of the state of large-scale rotating machinery.
Accordingly, the invention provides a dynamic testing system for a large-scale rotating machine seat ring gap based on an eddy current sensor, the testing principle of the system is shown in fig. 1, the eddy current sensor is installed on an upper seat ring of the large-scale rotating machine, a data acquisition instrument acquires output signals of the eddy current sensor, and the acquired data are transmitted to an upper computer through a gigabit network to be displayed and analyzed in real time. The dynamic testing method for the rotating mechanical race clearance comprises the following specific steps:
step one, the mounting mode of the electric eddy current is shown in fig. 2. The eddy current sensor is arranged on the upper seat ring of the large-scale rotating machinery, and 3 eddy current sensors are arranged on the upper seat ring
The interval between every two sensors is 120 degrees, and the through holes are used for measuring the axial displacement of the large-scale rotating machinery seat ring. Welding 3 mounting brackets on the upper seat ring of the large-scale rotating machine, and punching 3 mounting brackets
The position of the through hole is consistent with the position of the eddy current of the measuring axial gap, and the through hole is used for measuring the radial displacement of the large-scale rotating machinery seat ring.
And step two, calibrating the eddy current sensor by adopting a two-point calibration method. The determined two-point displacement values are X1 and X2 (unit mm) by using a feeler gauge, and the corresponding two-point output voltage values are V1 and V2 (unit mv) by using a data acquisition system, so that the sensitivity is as follows: s ═ V1-V2)/(X1-X2) (unit: mv/mm).
And step three, setting parameters of the data acquisition system. Setting a full-bridge mode for channel parameters, setting the bridge voltage to be 24V, setting the sensitivity to be a numerical value calculated in the second step, setting the measurement quantity to be a displacement value, setting the sampling frequency to be 128k, clearing balance, and setting the filtering mode to be low-pass filtering.
Step four, starting to collect data, and displaying the waveform of the data in real time; and storing the waveform data and the picture, and stopping acquisition when the acquisition is stopped.
And fifthly, carrying out spectrum analysis on the waveform by using an analysis mode of the test system, selecting a time period to be analyzed by the abscissa of the waveform analysis, and measuring the size of the gap value by the ordinate.
As a preferred embodiment, HZ-891XL is selected as the eddy current displacement sensor. The eddy current sensor pre-stage generates a high frequency current signal which is fed through a cable to the head of the probe, generating an alternating magnetic field around the head. The alternating magnetic field can generate an eddy current field on the surface of the lower race of the large-scale rotating machine, and the eddy current field can also generate an alternating magnetic field in the opposite direction, so that the amplitude and the phase of the high-frequency current of the probe head coil are changed, namely the effective impedance of the coil is changed. The distance change between the probe and the lower seat ring of the large-scale rotating machine can be converted into the change of an electric signal through the front-mounted device.
As a preferred implementation mode, the data acquisition instrument selects a domestic Donghua DH5922D data acquisition system which adopts an advanced System On Chip (SOC) and gigabit Ethernet communication, and the number of channels can be infinitely expanded; meanwhile, a DMA transmission mode is adopted, so that the condition that the sampling is not halted and the code leakage does not occur for a long time is ensured; continuous sampling frequency is up to 256 kHz/channel; and the machine can be started for automatic acquisition, and the unmanned requirement of large-scale rotating machinery is met.
In a preferred embodiment, the output line of the eddy current sensor and the input line of the data acquisition channel are welded on an aviation plug panel of the main control box, and a multimeter is used for measuring the conduction condition.
As a preferred embodiment, the large-scale rotating machinery race clearance dynamic test system further comprises an industrial personal computer, a temperature control detection control module and a temperature control module, wherein the industrial personal computer, the electric eddy current sensor pre-processor and the temperature control detection control module are fixedly installed in a main control box, a data acquisition system and the temperature control module are installed in a digital acquisition box, and two box bodies are respectively provided with a processing panel for aerial insertion installation and channel acquisition line connection. The industrial personal computer is used for setting parameters of the data acquisition system and storing acquired data, the temperature control detection module is used for monitoring the temperatures of the main control box and the data acquisition box, and the temperature control module is used for carrying out PTC heating temperature rise when the temperature is lower than-20 ℃.
As a more preferable embodiment, the main control box and the number mining box adopt a damping design. And a voltage stabilizing module can be additionally arranged, a power supply inputs 28V coarse power through the three-core aviation plug, and outputs 24V stable voltage through the 24V voltage stabilizing module to supply power to the data acquisition system and the industrial personal computer.
The dynamic testing system for the seat ring clearance of the large-scale rotating machinery carries out signal acquisition and analysis, the testing result is shown in figure 3, the ordinate is an actual measured clearance value, and the abscissa is a corresponding time value. It can be seen that the maximum measurement gap value is 0.120mm and the minimum measurement gap value is 0.080 mm.
In conclusion, the invention can dynamically measure the clearance of the seat ring of the large-scale rotating machinery with high precision, and has the functions of power-on self-starting, power-on self-checking, real-time monitoring of the running state and the like.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. The utility model provides a large-scale rotating machinery seat circle clearance dynamic test system which characterized in that, seat circle installation eddy current sensor on large-scale rotating machinery, utilizes the data acquisition appearance to gather eddy current sensor's output signal to the data of will gathering are passed through the gigabit net and are given host computer real-time display and analysis, and its rotating machinery seat circle clearance dynamic test's concrete step is:
step one, beating 3 upper seat rings
The through holes are spaced by 120 degrees and are used for installing the eddy current sensor to measure the axial displacement of the large-scale rotating machinery seat ring, 3 installing supports are welded on the large-scale rotating machinery upper seat ring, and 3 installing supports are arranged on the supports
And the position of measuring the axial gap eddy currentThe positions are consistent, and the eddy current sensors are used for mounting to measure the radial displacement of the large-scale rotating mechanical seat ring;
step two, calibrating the eddy current sensor by adopting a two-point calibration method, firstly, giving out determined two-point displacement values X1 and X2 by using a feeler gauge, and acquiring corresponding two-point output voltage values V1 and V2 by using a data acquisition system to further obtain the sensitivity of the eddy current sensor: s ═ (V1-V2)/(X1-X2);
setting parameters of a data acquisition system, including channel parameters, bridge voltage, sensitivity, measurement quantity, sampling frequency, balance zero clearing and a filtering mode;
step four, starting to collect, displaying the waveform of the data in real time, and storing the waveform data and the picture;
and step five, performing spectrum analysis on the waveform by taking the time period needing to be analyzed as an abscissa and taking the measurement gap value as an ordinate.
2. The large rotating machine race gap dynamic testing system of claim 1, characterized in that the eddy current displacement sensor is selected HZ-891 XL.
3. The large scale rotating machine race gap dynamic testing system of claim 1, wherein the data acquisition instrument is selected from the homemade donghua DH5922D data acquisition system.
4. The dynamic testing system for the seat clearance of the large-scale rotating machinery according to claim 1, wherein the output line of the eddy current sensor and the input line of the data acquisition channel are welded on an aviation plug panel of a main control box, and a universal meter is used for measuring the conduction condition.
5. The dynamic testing system for the seat ring gap of the large-scale rotating machinery as claimed in claim 1, further comprising an industrial personal computer, a temperature control detection control module and a temperature control module, wherein the industrial personal computer, the electric eddy current sensor pre-processor and the temperature control detection control module are fixedly installed in a main control box, the data acquisition system and the temperature control module are installed in a digital acquisition box, and two box bodies are both provided with panels for aerial insertion installation and channel acquisition line connection.
6. The dynamic testing system for the seat clearance of the large-scale rotating machinery according to claim 5, wherein the main control box and the data acquisition box are designed to be shock-absorbing.
7. The dynamic testing system for the seat ring gap of the large-scale rotating machinery as claimed in claim 5, wherein a voltage stabilizing module is additionally arranged, and a power supply outputs a stable voltage after passing through the voltage stabilizing module to supply power to the data acquisition system and the industrial personal computer.
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