CN114739505B - A detection system and method for shaft vibration sensor with clamp - Google Patents
A detection system and method for shaft vibration sensor with clamp Download PDFInfo
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- CN114739505B CN114739505B CN202210265852.8A CN202210265852A CN114739505B CN 114739505 B CN114739505 B CN 114739505B CN 202210265852 A CN202210265852 A CN 202210265852A CN 114739505 B CN114739505 B CN 114739505B
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
- G01M13/045—Acoustic or vibration analysis
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- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
本发明公开了一种轴振传感器带卡件的检测系统及方法，标准振动传感器位于振动台上，支架固定于振动台上，轴振传感器位于支架上，轴振金属圆盘位于标准振动传感器上，轴振传感器经前置放大器、机架及卡件与卡件计算机软件系统相连接，卡件位于机架的被测点处，前置放大器与直流稳压源及数字多用表相连接，振动台经功率放大器与振动控制仪相连接，振动控制仪与标准振动传感器相连接，振动控制仪与比较法计算机软件系统相连接，该系统及方法能够准确实现轴振传感器带卡件的检测。
The invention discloses a detection system and method for a shaft vibration sensor with a card. A standard vibration sensor is located on a vibration table, a bracket is fixed on the vibration table, the shaft vibration sensor is located on the bracket, a shaft vibration metal disc is located on the standard vibration sensor, the shaft vibration sensor is connected to a card computer software system via a preamplifier, a frame and a card, the card is located at a measured point of the frame, the preamplifier is connected to a DC voltage regulator and a digital multimeter, the vibration table is connected to a vibration controller via a power amplifier, the vibration controller is connected to a standard vibration sensor, and the vibration controller is connected to a comparison method computer software system. The system and method can accurately realize the detection of the shaft vibration sensor with a card.
Description
Technical Field
The invention relates to a detection system and a detection method, in particular to a detection system and a detection method for a shaft vibration sensor with a clamping piece.
Background
The amplitude of vibration in the operation of the unit is an important index for the safety and economical operation of the unit. The excessively strong vibration means that the unit has serious defects, and the excessively large vibration amplitude can cause a plurality of damages such as unstable speed regulation system and further cause accidents of the speed regulation system, bearing bush Uygur alloy breakage, loosening and breaking of fastening screws, loosening and damaging of a generator exciting part and even damage of a unit foundation, further increase vibration, reduction of fatigue resistance of a rotating part and further damage of blades, wheel discs and the like, abrasion of end shaft seals, abrasion of sliding pins, abrasion of a steam seal of a baffle plate, misoperation of a crisis breaker and the like. Therefore, in the starting, stopping and running process of the unit, the vibration condition of the bearing must be closely monitored, so that the safety of the unit equipment and personnel is protected.
In general, a user of the unit equipment can send the shaft vibration sensor part to a laboratory for detection before or during the installation of the shaft vibration sensor and the clamping piece, and the matched clamping piece hardly confirms the metering performance and the use parameters, so that the technical requirements of field practical application are ignored, and the accuracy and the protectiveness of a turbine monitoring system have defects and uncertainties.
The accurate measurement of the shaft vibration sensor belt clamping piece and the emission of the correct protection action are of great importance to the safe and stable operation of the unit, so that the integral detection of the shaft vibration sensor belt clamping piece has great significance for practical application.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for detecting a shaft vibration sensor belt clamping piece, which can accurately detect the shaft vibration sensor belt clamping piece.
In order to achieve the aim, the detection system of the shaft vibration sensor with the clamping piece comprises a standard vibration sensor, a vibration controller, a power amplifier, a vibrating table, a shaft vibration sensor, a preamplifier, a clamping piece, a rack, a comparison method computer software system, a clamping piece computer software system, a direct current voltage stabilizing source, a digital multimeter, a shaft vibration metal disc and a bracket;
The standard vibration sensor is positioned on the vibration table, the support is fixed on the vibration table, the shaft vibration sensor is positioned on the support, the shaft vibration metal disc is positioned on the standard vibration sensor, the shaft vibration sensor is connected with the clamping piece computer software system through the preamplifier, the rack and the clamping piece, the clamping piece is positioned at the tested point of the rack, the preamplifier is connected with the direct current voltage stabilizing source and the digital multimeter, the vibration table is connected with the vibration controller through the power amplifier, the vibration controller is connected with the standard vibration sensor, and the vibration controller is connected with the comparison method computer software system.
The standard vibration sensor is connected with the vibration controller through a cable.
The vibration controller is a dynamic signal analyzer.
The shaft vibration metal disc is rigidly arranged above the standard vibration sensor, and the shaft vibration sensor is fixed on the bracket with adjustable initial gap in a non-contact mode.
The shaft vibration sensor is connected with the preamplifier through a cable.
The output cable of the standard vibration sensor is fixed in a winding S-shaped manner.
The gap voltage between the shaft vibration sensor and the shaft vibration metal disc is measured to be-10V or-12V through a digital multimeter.
The detection method of the shaft vibration sensor belt clamping piece comprises the following steps:
1) The card computer software system obtains the output value of the card, and the comparison method computer software system obtains the vibration signal of the standard vibration sensor;
2) Calculating the relative error of each measured point of the clamping piece according to the output value of the clamping piece and the vibration signal of the standard vibration sensor;
3) And adjusting the clamping piece according to the relative error of each measured point of the clamping piece.
The invention has the following beneficial effects:
When the detection system and the detection method for the shaft vibration sensor with the clamping piece are specifically operated, the clamping piece computer software system obtains the output value of the clamping piece, the comparison method computer software system obtains the vibration signal of the standard vibration sensor, the relative error of each measured point of the clamping piece is calculated according to the output value of the clamping piece and the vibration signal of the standard vibration sensor, and the clamping piece is regulated according to the relative error of each measured point of the clamping piece, so that the accurate measurement of the vibration condition of the bearing and the generation of correct protection action are ensured, and the safety operation of generator set equipment is ensured.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The vibration control device comprises a standard vibration sensor 1, a vibration control instrument 2, a power amplifier 3, a vibrating table 4, a shaft vibration sensor 5, a preamplifier 6, a clamping piece 7, a rack 8, a comparison method computer software system 9, a clamping piece computer software system 10, a direct current voltage stabilizing source 11, a digital multimeter 12, a shaft vibration metal disc 13 and a bracket 14.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Referring to fig. 1, the detection system with clamping pieces for the shaft vibration sensor comprises a standard vibration sensor 1, a vibration controller 2, a power amplifier 3, a vibration table 4, a shaft vibration sensor 5, a preamplifier 6, clamping pieces 7, a frame 8, a comparison method computer software system 9, a clamping piece computer software system 10, a direct current voltage stabilizing source 11, a digital multimeter 12, a shaft vibration metal disc 13 and a bracket 14;
The standard vibration sensor 1 is positioned on the vibration table 4, the bracket 14 is fixed on the vibration table 4, the shaft vibration sensor 5 is positioned on the bracket 14, the shaft vibration metal disc 13 is positioned on the standard vibration sensor 1, the shaft vibration sensor 5 is connected with the clamping piece computer software system 10 through the preamplifier 6, the rack 8 and the clamping piece 7, the clamping piece 7 is positioned at a measured point of the rack 8, the preamplifier 6 is connected with the direct current voltage stabilizing source 11 and the digital multimeter 12, the vibration table 4 is connected with the vibration controller 2 through the power amplifier 3, the vibration controller 2 is connected with the standard vibration sensor 1, and the vibration controller 2 is connected with the comparison computer software system 9;
The device comprises a standard vibration sensor 1, a vibration controller 2, a dynamic signal analyzer, a shaft vibration metal disc 13, a pre-amplifier 6, a shaft vibration sensor 5, a cable, a pre-amplifier 6, a cable, an output cable of the standard vibration sensor 1, a cable winding S-shaped structure, and a digital multimeter 12, wherein the shaft vibration metal disc 13 is arranged above the standard vibration sensor 1, the shaft vibration sensor 5 is arranged on the bracket 14 with adjustable initial gap, the output cable of the standard vibration sensor 1 is arranged on the bracket 14 with adjustable initial gap, the standard vibration sensor 1 is connected with the vibration controller 2 through the cable, the vibration controller 2 is a dynamic signal analyzer, the shaft vibration metal disc 13 is rigidly arranged above the standard vibration sensor 1, the shaft vibration sensor 5 is fixed on the bracket 14 with good rigidity and adjustable initial gap in a non-contact mode, the shaft vibration sensor 5 is connected with the pre-amplifier 6 through the cable, and the output cable of the standard vibration sensor 1 is fixed around the cable in an S-shaped structure, so that the gap voltage between the shaft vibration sensor 5 and the shaft vibration metal disc 13 can be measured to be-10V or-12V through the digital multimeter 12.
The specific working process of the invention is as follows:
Providing a vibration signal source for the vibration table 4 through the vibration controller 2 and the power amplifier 3, acquiring an output value of the clamping piece 7 by the clamping piece computer software system 10, and acquiring a vibration signal detected by the standard vibration sensor 1 by the comparison method computer software system 9;
During detection, 24V power supply is provided for the preamplifier 6 through the direct-current voltage stabilizing source 11, and the bracket 14 is regulated, so that the gap voltage between the shaft vibration sensor 5 and the shaft vibration metal disc 13, which is measured by the digital multimeter 12, is-10V or-12V;
the amplitude linearity detection comprises selecting a working reference frequency point of 55Hz, sequentially setting vibration amplitude values of 20 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm and 350 μm, converting the vibration amplitude value once, and recording the actual output amplitude value and current signal output value of the clamping piece 7 after stabilizing;
the frequency response detection comprises the steps of selecting a vibration amplitude constant value of 100 mu m, sequentially setting frequencies of 10Hz, 20Hz, 40Hz, 50Hz, 60Hz, 80Hz and 100Hz, and recording the actual output amplitude value and current signal output value of the clamping piece 7 after the vibration amplitude constant value is stabilized at each frequency point;
And detecting an alarm value protection action value, namely giving corresponding standard voltage and displacement signals to the vibrating table 4 at a reference frequency point of 55Hz (avoiding power frequency), and displaying and recording the output values of the alarm state and the protection action state of the clamping piece 7 and the standard output value according to the indicator lamp display of the clamping piece 7.
Calculating the relative measurement error of the clamping piece 7, and adjusting the clamping piece 7 according to the relative measurement error of the clamping piece 7, wherein,
Wherein, the relative error of amplitude linearity is:
The relative error of the frequency response is:
the relative error of the current output is:
Wherein Δx L is the relative error of each measured point of the clamping member 7, x i is the indication value of each measured point of the clamping member 7, x 0 is a preset standard value, Δx f is the relative error of each measured point of the clamping member 7, x i is the indication value of each measured point of the clamping member 7, x r is the standard value of the clamping member 7 at a certain reference frequency point, Δa is the relative error of current output of each measured point of the clamping member 7, a i is the output value of each measured point of the clamping member 7, and a 0 is the output standard value of the clamping member 7.
The output of the clamping piece 7 is regulated according to the relative measurement error of the clamping piece 7.
When the relative measurement error is within the maximum allowable error range, the alarm value and the protection action value of the clamping piece 7 meet the field application requirement.
The clamping piece 7 determines measured points according to the measuring range, all the measured points are uniformly distributed as much as possible according to the measuring range, the measured points are required to cover the measured points required by the actual work and the protection action of the site, the vibration controller 2 and the power amplifier 3 provide measuring vibration sources according to the determined measured points, and after the measuring vibration sources are stabilized, the comparison method computer software system 9 and the clamping piece computer software system 10 respectively collect standard values and measured values of the clamping piece 7 at all the measured points.
The amplitude linearity, frequency response and relative error of current output of the clamping piece 7 meet the technical indexes of +/-5%;
In the field practical application, the alarm value and the protection action value of the vibration setting of the common unit bearings of 300MW, 600MW and the like are 125 mu m and 250 mu m respectively, the standard voltage and the displacement value of the clamp 7 in the alarm and protection action display state and the output current and the displacement value of the clamp 7 are recorded as the alarm value and the protection action value by adjusting the output voltage value of the vibration control instrument 2 at the reference frequency point of 55Hz, the alarm and protection action display state of the clamp 7 is ensured to be correct without display or error display, and the alarm value and the protection action value meet the technical index requirements of the field practical application.
The invention is characterized in that:
the amplitude linearity, the frequency response and the relative measurement error of the current output of the shaft vibration sensor belt clamping piece can be accurately judged whether exceeds the maximum allowable error value;
whether the shaft vibration sensor belt clamping piece meets the use of bearing vibration monitoring of a thermal power plant or not can be determined, and the accuracy and the reliability of a steam turbine monitoring system are ensured;
The adjustment and correction of the shaft vibration sensor belt clamping piece can be provided, and the accuracy of measured parameters is ensured.
The alarm value and the protection action value of the shaft vibration sensor belt clamping piece can be accurately measured, the vibration condition of the bearing can be measured in the starting, stopping and running processes of the unit, the correct alarm indication and protection action can be made, and the safety of the unit equipment and personnel is ensured.
Claims (7)
1. The detection method of the shaft vibration sensor with the clamping piece is characterized by comprising a detection system based on the shaft vibration sensor with the clamping piece, wherein the detection system comprises a standard vibration sensor (1), a vibration control instrument (2), a power amplifier (3), a vibration table (4), a shaft vibration sensor (5), a preamplifier (6), the clamping piece (7), a rack (8), a comparison method computer software system (9), a clamping piece computer software system (10), a direct current voltage stabilizing source (11), a digital multimeter (12), a shaft vibration metal disc (13) and a bracket (14);
The standard vibration sensor (1) is positioned on the vibration table (4), the bracket (14) is fixed on the vibration table (4), the shaft vibration sensor (5) is positioned on the bracket (14), the shaft vibration metal disc (13) is positioned on the standard vibration sensor (1), the shaft vibration sensor (5) is connected with the clamping piece computer software system (10) through the preamplifier (6), the stand (8) and the clamping piece (7), the clamping piece (7) is positioned at a measured point of the stand (8), the preamplifier (6) is connected with the direct current voltage stabilizing source (11) and the digital multimeter (12), the vibration table (4) is connected with the vibration control instrument (2) through the power amplifier (3), the vibration control instrument (2) is connected with the standard vibration sensor (1), and the vibration control instrument (2) is connected with the comparison method computer software system (9);
the method comprises the following steps:
1) The clamping piece computer software system (10) acquires the output value of the clamping piece (7), and the comparison method computer software system acquires the vibration signal of the standard vibration sensor (1);
2) Calculating the relative error of each measured point of the clamping piece (7) according to the output value of the clamping piece (7) and the vibration signal of the standard vibration sensor (1);
3) Adjusting the clamping piece (7) according to the relative error of each measured point of the clamping piece (7);
Selecting a working reference frequency point of 55Hz, sequentially setting vibration amplitude values of 20 mu m, 50 mu m, 100 mu m, 150 mu m, 200 mu m, 250 mu m, 300 mu m and 350 mu m, converting the vibration amplitude values once, and recording the actual output amplitude value and the current signal output value of the clamping piece (7) after the vibration amplitude values are stabilized;
The frequency response detection comprises the steps of selecting a vibration amplitude constant value of 100 mu m, sequentially setting frequencies of 10Hz, 20Hz, 40Hz, 50Hz, 60Hz, 80Hz and 100Hz, and recording the actual output amplitude value and the current signal output value of the clamping piece (7) after the vibration amplitude constant value is stabilized at each frequency point;
The alarm value protection action value detection, namely giving corresponding standard voltage and displacement signals to the vibrating table (4) at a reference frequency point of 55Hz, and displaying and recording the alarm state of the clamping piece (7) and the output value and standard output value of the protection action state according to the indicator lamp of the clamping piece (7);
Calculating the relative measurement error of the clamping piece (7), and adjusting the clamping piece (7) according to the relative measurement error of the clamping piece (7), wherein,
Wherein, the relative error of amplitude linearity is:
The relative error of the frequency response is:
the relative error of the current output is:
Wherein Δx L is the relative error of each measured point of the clamping piece (7), x i is the indication value of each measured point of the clamping piece (7), x 0 is a preset standard value, Δx f is the relative error of each measured point of the clamping piece (7), x i is the indication value of each measured point of the clamping piece (7), x r is the standard value of the clamping piece (7) at a certain reference frequency point, Δa is the relative error of the current output of each measured point of the clamping piece (7), a i is the output value of each measured point of the clamping piece (7), and a 0 is the output standard value of the clamping piece (7).
2. The method for detecting the shaft vibration sensor belt clamping piece according to claim 1, wherein the standard vibration sensor (1) is connected with the vibration control instrument (2) through a cable.
3. The method for detecting the shaft vibration sensor belt clamping piece according to claim 1, wherein the vibration controller (2) is a dynamic signal analyzer.
4. The method for detecting the shaft vibration sensor belt clamping piece according to claim 1, wherein the shaft vibration metal disc (13) is rigidly arranged above the standard vibration sensor (1), and the shaft vibration sensor (5) is fixed on the bracket (14) capable of adjusting the initial gap in a non-contact mode.
5. The method for detecting a shaft vibration sensor belt clamping piece according to claim 1, wherein the shaft vibration sensor (5) is connected with the preamplifier (6) through a cable.
6. The method for detecting a shaft vibration sensor belt clip according to claim 1, wherein the output cable of the standard vibration sensor (1) is fixed in a manner of being wound around an S-shape.
7. The method for detecting the shaft vibration sensor belt clamping piece according to claim 1, wherein the gap voltage between the shaft vibration sensor (5) and the shaft vibration metal disc (13) is measured to be-10V or-12V through a digital multimeter (12).
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| CN202210265852.8A CN114739505B (en) | 2022-03-17 | 2022-03-17 | A detection system and method for shaft vibration sensor with clamp |
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| CN202210265852.8A CN114739505B (en) | 2022-03-17 | 2022-03-17 | A detection system and method for shaft vibration sensor with clamp |
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