CN-121994179-A - Axial displacement sensor field detection method

CN121994179ACN 121994179 ACN121994179 ACN 121994179ACN-121994179-A

Abstract

The invention provides a field detection method of an axial displacement sensor, belongs to the technical field of rotary machine monitoring, and can at least partially solve the problems of long time consumption and poor working condition matching of offline verification in the prior art. The method comprises the steps of installing a sensor probe on a detection device and keeping the original wiring state of an extension line and a front end processor, establishing a displacement reference through a laser interferometer, driving a simulation target to move according to a detection point sequence, collecting a standard value and obtaining a measurement value, and generating a detection report after error calculation and linearity analysis are carried out on the collected data. The invention realizes the near-in-situ detection of the sensor, obviously shortens the downtime, and can trace the detection result to the measurement standard.

Inventors

QU LILI
ZHOU CHENLONG
WEI XUAN
CAO HAOJUN
LI HAO
YOU ZHIXUN
GUO WEI
LI SIYAO
WANG ZHIHAO
LIU HUAN

Assignees

西安热工研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20260211

Claims (10)

1. An on-site detection method of an axial displacement sensor, comprising the steps of: The sensor transfer installation, namely detaching a probe of a displacement sensor to be detected from an original measuring point and installing the probe on a sensor installation bracket of a detection device, wherein an extension line connected with the displacement sensor and a front-end processor keep an original wiring state; Setting a displacement reference, namely adjusting the simulated target to the position right in front of the probe, adjusting the distance between the simulated target and the probe according to a measuring point displacement value displayed by a monitoring system until the displacement value is zero, and recording the current position of the simulated target as the zero point of the displacement reference; Starting detection after inputting detection parameters, driving the simulated target to sequentially move according to a preset detection point sequence, collecting an actual displacement value of the simulated target at each detection point as a standard value, and obtaining a displacement value displayed by the monitoring system as a measured value; And (3) data processing and judging, namely calculating single-point errors of all detection points and linearity of the sensor according to the standard value and the measured value, outputting a judging result according to comparison of a calculating result and a preset allowable range, and generating a detection report.
2. The method for in-situ detection of an axial displacement sensor of claim 1, wherein prior to the sensor transfer installation further comprises in-situ preparation of: confirming that the unit is in a stop state, and placing the detection device near the displacement sensor to be detected; connecting the detection device to a machine ground terminal through a ground wire, and ensuring that the ground resistance is not greater than a preset ground resistance threshold; and checking the battery electric quantity, the scram key function and the surface state of the simulation target.
3. The method of on-site axial displacement sensor inspection of claim 1, wherein the sensor transfer mounting further comprises: loosening the mounting nut of the displacement sensor and then detaching the probe from the original measuring point; the probe is mounted on the sensor mounting bracket and fixed through a clamp; ensuring that the simulated target remains parallel to the end face of the probe.
4. The on-site detection method of an axial displacement sensor according to claim 1, wherein the detection parameter includes set displacement values of a plurality of detection points, the number of the detection points being not less than 5 and being distributed in the range of the measurement range; Sensor information is also required to be input before the detection is started, and the sensor information comprises a sensor model, a measuring range and sensitivity.
5. The on-site detection method of an axial displacement sensor according to claim 1, wherein in the automatic detection execution, a ball screw is driven by a stepping motor through a speed reducer to drive the simulated target to move, and the simulated target stays at each detection point for a preset time to wait for the display reading of the monitoring system to be stable.
6. The method for in-situ detection of an axial displacement sensor according to claim 1, wherein the calculation formula of the single point error is: ; Wherein, the Representing the single point of error of the said signal, The value of the measurement is indicated as such, Representing the standard value.
7. The method for in-situ detection of an axial displacement sensor according to claim 1, wherein the linearity is calculated by: performing linear fitting on the data of all the detection points by adopting a least square method to obtain a fitting straight line; calculating the deviation between the measured value of each detection point and the corresponding value of the fitting straight line; And taking the ratio of the maximum absolute value of the deviation to the measuring range as the linearity.
8. The method for in-situ detection of an axial displacement sensor of claim 1, wherein the automatic detection further comprises a double safety limit protection during the execution of the automatic detection: When the distance between the simulated target and the probe is smaller than a preset minimum distance threshold or larger than a preset maximum distance threshold, triggering a stop by a photoelectric limit switch; and when the photoelectric limit switch fails, the mechanical stop block prevents the analog target from moving continuously.
9. The method according to claim 1, wherein the detection report includes unit identification information, sensor identification information, a detection time, the standard value of each detection point, the measured value and the single point error, the linearity value, an error curve, and the determination result.
10. The method for in-situ detection of an axial displacement sensor of claim 1, wherein the generating of the detection report further comprises sensor reinstallation: Controlling the simulated target to retract to an initial position; detaching the probe from the sensor mounting bracket; And reinstalling the probe to the original measuring point position.

Description

Axial displacement sensor field detection method Technical Field The invention relates to the technical field of rotary machine monitoring, in particular to a field detection method of an axial displacement sensor. Background The TSI system is a safety monitoring system of a large-scale rotary machine, monitors parameters such as shaft displacement, shaft vibration, eccentricity and the like through a displacement sensor, monitors parameters such as bearing seat vibration and the like through a speed sensor, acquires key operation parameters of a unit in real time, triggers an alarm or stops for protection when the parameters exceed the limit, and avoids major accidents such as shaft system collision and abrasion, bearing failure and the like. The system is widely applied to large-scale rotary mechanical equipment such as a steam turbine, a gas turbine and the like, and has important significance for guaranteeing safe and stable operation of key infrastructure such as electric power, petrochemical industry and the like. Currently TSI sensors commonly employ an off-line laboratory verification or calibration mode that suffers from the following technical drawbacks and engineering problems. First, assay calibration takes longer. The off-line checking and calibrating mechanism performs sensor checking or calibrating, not only comprises actual checking and calibrating time, but also requires the dismantling time, the round trip time, the waiting time of the checking and calibrating mechanism and the like of the sensor extension line and the front end processor, thereby obviously increasing the machine set downtime and causing larger economic loss. Second, the flexibility is poor. During the running of the unit, the sensor may drift in sensitivity due to factors such as ambient temperature, electromagnetic interference, mechanical vibration, etc., so as to form a misalignment blind area. Because the machine can not be stopped for a long time, a sensor extension line can not be disassembled, and the like, the problem of single measuring point of a machine set can not be timely and quantitatively verified, the machine set can be processed only in the maintenance period, and long processes such as the shutdown cooling of a steam turbine, the disassembly of the sensor and the extension line and a front-end processor, the sending and detection, the reinstallation, the startup debugging and the like are required to be carried out. Third, the condition matching is poor. The laboratory verification calibration environment is usually 23 ℃ plus or minus 5 ℃ at normal temperature, has no electromagnetic interference and static environment, and has great difference with the field working condition. When in operation, the bearing seat is in a high-temperature state, and a strong magnetic field environment exists around the generator, so that the laboratory calibration result cannot well reflect the actual performance of the site. Therefore, how to design a field detection method which is not completely disassembled and is close to the field working condition, and solve the inherent defects of offline delivery verification and calibration is a core problem which needs to be solved in the current rotary machine monitoring field. Disclosure of Invention The invention aims to at least solve one of the technical problems in the prior art and provides a field detection method of an axial displacement sensor. In order to achieve the above object, the present invention provides a method for in-situ detection of an axial displacement sensor, comprising: The sensor transfer installation, namely detaching a probe of a displacement sensor to be detected from an original measuring point and installing the probe on a sensor installation bracket of a detection device, wherein an extension line connected with the displacement sensor and a front-end processor keep an original wiring state; Setting a displacement reference, namely adjusting the simulated target to the position right in front of the probe, adjusting the distance between the simulated target and the probe according to a measuring point displacement value displayed by a monitoring system until the displacement value is zero, and recording the current position of the simulated target as the zero point of the displacement reference by a laser interferometer; starting detection after inputting detection parameters, driving the simulation target to sequentially move according to a preset detection point sequence, collecting an actual displacement value measured by the laser interferometer at each detection point as a standard value, and obtaining a displacement value displayed by the monitoring system as a measured value; And (3) data processing and judging, namely calculating single-point errors of all detection points and linearity of the sensor according to the standard value and the measured value, outputting a judging result according to comparison of a calculating result and a