Vibration sensor calibration device and method

Abstract

The application discloses a kind of vibration sensor calibration device and method, belong to vibration sensor calibration technical field, it includes calibration device host, calibration comparison sensor and standard background board, the vibration excitation source of calibration device host is arranged at the center position of standard background board, and the distance is equal, and the vibration excitation source is compared with the distance of calibration comparison sensor and the vibration sensor to be checked, calibration comparison sensor and the vibration sensor to be checked are connected with the acquisition end signal of calibration device host;Annular mounting groove is arranged on standard background board, and calibration comparison sensor and the vibration sensor to be checked are arranged in annular mounting groove, and are fixed by fixing part.The application can flexibly adjust the number of vibration sensor to be measured, position, and carry out convenient fixing, and utilize standard adjustable vibration source to emit signal, and the synchronous measurement comparison of calibration comparison sensor and the vibration sensor to be checked is realized, to realize accurate calibration to vibration sensor.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vibration sensor calibration, and particularly relates to a vibration sensor calibration device and method. BACKGROUND

[0002] At present, vibration sensors are widely used in power systems for monitoring abnormal vibrations of large power equipment such as transformers (high resistance) caused by internal bolt loosening, partial discharge and other faults, which plays an important role in early warning of power equipment defects in operation. The vibration online monitoring device in operation is affected by the high electric field and high magnetic field of the live equipment for a long time, and the performance of the internal electronic components may be aged or deteriorated, resulting in poor measurement accuracy, which affects the accurate judgment of the running state of the power equipment. Therefore, it is necessary to regularly calibrate the online monitoring device. However, there is no perfect calibration method for vibration sensors at present. Therefore, a vibration sensor laboratory calibration method is needed to ensure the uniformity of the test environment, use a standard adjustable vibration source to send signals, and realize the laboratory calibration of the vibration sensor by comparing the synchronous measurement of the sensor and the vibration sensor to be calibrated, which has great popularization value.

[0003] The patent document with publication number CN 208488164 U discloses a multi-type vibration sensor comparison device, which comprises a fixed disc, a vibration calibration device, a data acquisition device and a computer. The vibration calibration device is connected with a plurality of vibration sensors to be measured, and is used to output a control signal according to a control instruction to control the vibration of the vibration sensors to be measured. The fixed disc comprises a plurality of sensor mounting grooves for mounting the vibration sensors to be measured. The data acquisition device is connected with the plurality of vibration sensors to be measured respectively, and is used to acquire the vibration response signals generated by each vibration sensor when the plurality of vibration sensors vibrate. The computer is connected with the data acquisition device and the vibration calibration device respectively, and is used to acquire the vibration response signals and output the control instruction to the vibration calibration device. In the patent document, the vibration sensors are fixed by being screwed into the sensor mounting grooves. However, most vibration sensors do not have pre-set threads, so the use range of the comparison device is small and the flexibility is poor.

[0004] The patent document with the publication number CN 108981893 A discloses an eddy current sensor dynamic and static characteristic verification support and a verification method, which specifically realizes dynamic and static test of the eddy current sensor on a vibration calibration test bench in an eddy current sensor verification process. The invention comprises a base, a stand, a beam, a sliding seat, a clamp, a micrometer, an eddy current sensor, a voltage display and a cable, the stand is installed on the base, the beam is slidingly installed on the stand, the sliding seat is slidingly installed on the beam, the micrometer is installed on the sliding seat, the clamp is installed on the micrometer, the eddy current sensor is installed on the clamp, and the eddy current sensor is connected with the voltage display through the cable. The calibration test bench for different types of vibration sensors can be used to carry out calibration work for the eddy current sensor, which is convenient to use and realizes calibration of dynamic and static characteristics of multiple eddy current sensors; and is suitable for fixing eddy current sensors with different diameters. However, the invention can only calibrate one vibration sensor at a time, and the efficiency is low. SUMMARY

[0005] Therefore, the present application provides a vibration sensor calibration device and method, which can flexibly adjust the number and position of the vibration sensor to be tested, and conveniently fix it, ensure the uniformity of the test environment, use a standard adjustable vibration source to emit a signal, and realize accurate calibration of the vibration sensor by synchronous measurement and comparison of the calibration comparison sensor and the vibration sensor to be calibrated.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows: a vibration sensor calibration device, comprising a calibration device host, a calibration comparison sensor and a standard background plate, wherein the vibration excitation source of the calibration device host is arranged at the center position of the standard background plate, the calibration comparison sensor and the vibration sensor to be calibrated are both arranged on the standard background plate and are equidistant from the vibration excitation source, and the calibration comparison sensor and the vibration sensor to be calibrated are both connected with the signal acquisition end of the calibration device host.

[0007] An annular mounting groove is arranged on the standard background plate, the vibration excitation source is arranged at the center of the annular mounting groove, a plurality of fixing members are arranged outside the annular mounting groove, and the calibration comparison sensor and the vibration sensor to be calibrated are both arranged in the annular mounting groove and are fixed by the fixing members.

[0008] Further, the standard background plate is an aluminum plate with uniform thickness.

[0009] Further, a plurality of screw holes are uniformly arranged on the side of the annular mounting groove, the fixing member is a bolt, and the bolt is threadedly connected in the screw hole.

[0010] Further, a plurality of annular mounting sleeves are movably arranged in the annular mounting groove, screw holes are also arranged on the side surface of the annular mounting sleeve, the test comparison sensor and the to-be-tested vibration sensor are placed in the annular mounting sleeve, and the bolts are sequentially threaded through the annular mounting groove and the annular mounting sleeve for fixation.

[0011] A vibration sensor calibration method, comprising the following steps:

[0012] S1: install the vibration excitation source of the calibration device host in the center position of the standard background plate, and ensure that the vibration characteristics of the vibration excitation signal emitted by the calibration device host remain uniform in the entire standard background plate transmission range;

[0013] S2: symmetrically arrange the test comparison sensor and the to-be-tested vibration sensor with the vibration excitation source as the center point, and ensure that the test environments of the test comparison sensor and the to-be-tested vibration sensor are consistent;

[0014] S3: record the measurement values of the test comparison sensor and the to-be-tested vibration sensor by adjusting the vibration excitation signal of the vibration excitation source, and realize the calibration of the vibration sensor by synchronously measuring and comparing the test comparison sensor and the to-be-tested vibration sensor.

[0015] Compared with the prior art, the vibration sensor calibration device has the following beneficial effects:

[0016] 1. The vibration sensor calibration device of the present application is characterized in that an annular mounting groove is arranged on the standard background plate, the vibration excitation source of the calibration device host is located in the center of the annular mounting groove, the test comparison sensor and the to-be-tested vibration sensor are arranged in the annular mounting groove and are respectively fixed by the fixing members, and the distance between the test comparison sensor, the to-be-tested vibration sensor and the vibration excitation source is kept consistent, thereby ensuring the calibration accuracy, and the number and position of the to-be-tested vibration sensor can be adjusted at will, the installation flexibility is high, and the calibration efficiency is improved.

[0017] 2. The annular mounting groove movably arranges a plurality of annular mounting sleeves, screw holes are arranged on the side surface of the annular mounting sleeve, the test comparison sensor and the to-be-tested vibration sensor are placed in the annular mounting sleeve, and the bolts are sequentially threaded through the annular mounting groove and the annular mounting sleeve for fixation. The structure design is because there are many types and models of vibration sensors, and their shapes are cylindrical, hexagonal prism, etc. If only the bolts are used for fixation, there are problems of inconvenient fixation and instability. The present application arranges a plurality of annular mounting sleeves in the annular mounting groove, and the vibration sensors are placed therein, which can limit the vibration sensors from being squeezed and sliding during fixation, and the bolts are sequentially threaded through the annular mounting groove and the annular mounting sleeve, thereby abutting and fixing the vibration sensors.

[0018] 3. The vibration sensor calibration method of the present application realizes the uniformity of the test environment through the standard background plate, then uses the standard adjustable vibration source to emit signals, and realizes the laboratory calibration of the vibration sensor through the synchronous measurement comparison of the calibration comparison sensor and the calibrated vibration sensor. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the working principle diagram of embodiment 1 of the present application;

[0020] Figure 2 is the top view of embodiment 2 of the present application;

[0021] Figure 3 is the front view of embodiment 3 of the present application;

[0022] Figure 4 is the top view of embodiment 3 of the present application;

[0023] In the figure, 1 is a calibration device host, 2 is a calibration comparison sensor, 3 is a standard background plate, 4 is a vibration excitation source, 5 is a calibrated vibration sensor, 6 is a ring-shaped mounting groove, 7 is a bolt, 8 is a ring-shaped mounting sleeve, 9 is a bottom plate, 10 is a support rod, 11 is a ring-shaped frame, and 12 is a buckle. DETAILED DESCRIPTION

[0024] To make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0025] Embodiment 1

[0026] The embodiments of the present application provide a vibration sensor laboratory calibration method, which first installs the vibration excitation source of the calibration device host at the most possible central position of the standard background plate, ensures that the vibration characteristics of the vibration excitation signal emitted by the calibration device host in the transmission range of the entire standard background plate are as uniform as possible, then symmetrically arranges the calibration comparison sensor and the calibrated vibration sensor with the vibration excitation source as the center point, and ensures that the test environment of the calibration comparison sensor and the calibrated vibration sensor is as consistent as possible. For the sake of convenience, the arrangement points of the vibration excitation source, the calibration comparison sensor and the calibrated vibration sensor can be marked in advance on the standard background plate with a marker pen. By adjusting the vibration excitation signal of the vibration excitation source, the measurement values of the calibration comparison sensor and the calibrated vibration sensor are recorded, and the laboratory calibration of the vibration sensor is realized.

[0027] The standard background plate is an aluminum plate with uniform material processing (no air gap, crack or other metal impurities inside), uniform size and thickness, so as to ensure that the vibration excitation signal emitted by the calibration device host is transmitted with uniform characteristics in the entire standard background plate.

[0028] As shown in Figure 1 , the basic principle of the vibration sensor calibration method is to realize the uniformity of the test environment through the standard background plate, and then use the standard adjustable vibration source to emit a signal, and realize the laboratory calibration of the vibration sensor through the synchronous measurement comparison of the calibration comparison sensor and the vibration sensor to be calibrated.

[0029] Embodiment 2

[0030] As shown in Figure 2 , a vibration sensor calibration device includes a calibration device host 1, a calibration comparison sensor 2 and a standard background plate 3, the vibration excitation source 4 of the calibration device host 1 is arranged at the center position of the standard background plate 3, the calibration comparison sensor 2 and the vibration sensor to be calibrated 5 are arranged on the standard background plate 3 and have equal distances from the vibration excitation source 4, and the calibration comparison sensor 2 and the vibration sensor to be calibrated 5 are connected with the acquisition end signal of the calibration device host 1.

[0031] The standard background plate 3 is provided with a ring-shaped mounting groove 6, the vibration excitation source 4 is arranged at the center of the ring-shaped mounting groove 6, a plurality of fixing members are arranged outside the ring-shaped mounting groove 6, and the calibration comparison sensor 2 and the vibration sensor to be calibrated 5 are arranged in the ring-shaped mounting groove 6 and are fixed by the fixing members respectively.

[0032] The standard background plate 3 is an aluminum plate with uniform thickness.

[0033] A plurality of screw holes are uniformly arranged on the side of the ring-shaped mounting groove 6, the fixing member is a bolt 7, the bolt 7 is threadedly connected in the screw hole, a plurality of ring-shaped mounting sleeves 8 are movably arranged in the ring-shaped mounting groove 6, screw holes are also arranged on the side surface of the ring-shaped mounting sleeve 8, the calibration comparison sensor 2 and the vibration sensor to be calibrated 5 are placed in the ring-shaped mounting sleeve 8, and the bolt 7 passes through the ring-shaped mounting groove 6 and the ring-shaped mounting sleeve 8 in sequence for fixation.

[0034] The vibration sensor calibration device of the embodiment of the application has a calibration method as follows:

[0035] S1: install the vibration excitation source of the calibration device host at the center position of the standard background plate, so as to ensure that the vibration characteristics of the vibration excitation signal emitted by the calibration device host remain uniform in the entire standard background plate transmission range;

[0036] S2: Install the verification comparison sensor and the vibration sensor being verified in different annular mounting sleeves within the annular mounting groove, and fix the sensor by passing bolts through the annular mounting groove and the annular mounting sleeve in sequence;

[0037] S3: By adjusting the vibration excitation signal of the vibration excitation source, the measured values ​​of the comparison sensor and the vibration sensor being tested are recorded and compared. The vibration sensor is tested by synchronously measuring and comparing the comparison sensor and the vibration sensor being tested.

[0038] The vibration sensor calibration device of this invention has an annular mounting groove on a standard background plate, with a vibration excitation source at the center. When the calibration comparison sensor and the vibration sensor to be calibrated are mounted on the annular mounting groove, the distance from both to the vibration excitation source can be guaranteed to be equal. Moreover, multiple vibration sensors to be calibrated can be mounted, enabling simultaneous calibration of multiple vibration sensors and improving calibration efficiency.

[0039] Example 3

[0040] like Figures 3-4 As shown, the vibration sensor calibration device of this embodiment is a further improvement on embodiment 2, and its difference from embodiment 2 is as follows:

[0041] It also includes a base plate 9 and a wire support frame. The standard background plate 3 is fixedly mounted on the base plate 9. The wire support frame is mounted on the base plate 9 and located outside the standard background plate 3. The wire support frame includes a support rod 10 and a ring frame 11. The ring frame 11 is fixedly mounted on the support rod 10. The ring frame 11 is located directly above the standard background plate 3. Multiple buckles 12 are slidably mounted on the ring frame 11. The wires of the verification comparison sensor 2 and the vibration sensor 5 being verified are respectively secured in the buckles 12 and can slide around the ring frame 11.

[0042] The vibration sensor calibration device of this invention sets up a wire support frame above the standard background plate, so that the wires of the calibration comparison sensor and the vibration sensor being calibrated are arranged upwards, thereby avoiding a large number of wires falling on the standard background plate and affecting the calibration results. Moreover, the wires slide along the ring frame through the buckle, so the wiring is neat and flexible, and can adapt to the position setting of multiple vibration sensors being calibrated.

[0043] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A vibration sensor calibration device, characterized in that: The device includes a calibration device host, a calibration comparison sensor, and a standard background plate. The vibration excitation source of the calibration device host is located at the center of the standard background plate. The calibration comparison sensor and the vibration sensor being calibrated are both located on the standard background plate and are equidistant from the vibration excitation source. Both the calibration comparison sensor and the vibration sensor being calibrated are connected to the signal acquisition terminal of the calibration device host. An annular mounting groove is provided on the standard background plate, and the vibration excitation source is provided at the center of the annular mounting groove. Multiple fixing parts are provided on the outside of the annular mounting groove. The verification comparison sensor and the vibration sensor being verified are both provided in the annular mounting groove and are respectively fixed by the fixing parts. The annular mounting groove is provided with a plurality of screw holes evenly distributed around its periphery. The fastener is a bolt, which is threaded into the screw hole. A plurality of annular mounting sleeves are movably disposed in the annular mounting groove. The annular mounting sleeves are also provided with screw holes on their sides. The verification comparison sensor and the vibration sensor being verified are placed in the annular mounting sleeves. The bolt passes through the annular mounting groove and the annular mounting sleeves in sequence for fixation. The verification method of the vibration sensor verification device is as follows: S1: Install the vibration excitation source of the calibration device host at the center of the standard background plate to ensure that the vibration characteristics of the vibration excitation signal emitted by the calibration device host remain uniform throughout the transmission range of the entire standard background plate. S2: Install the verification comparison sensor and the vibration sensor being verified in different annular mounting sleeves within the annular mounting groove, and fix the sensor by passing bolts through the annular mounting groove and the annular mounting sleeve in sequence; S3: By adjusting the vibration excitation signal of the vibration excitation source, the measured values ​​of the comparison sensor and the vibration sensor being tested are recorded and compared. The vibration sensor is tested by synchronously measuring and comparing the comparison sensor and the vibration sensor being tested.

2. The vibration sensor calibration device according to claim 1, characterized in that: The standard background plate is an aluminum plate of uniform thickness.

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