CN218916800U - Slot wedge tightness diagnostic system - Google Patents
Slot wedge tightness diagnostic system Download PDFInfo
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- CN218916800U CN218916800U CN202320063264.6U CN202320063264U CN218916800U CN 218916800 U CN218916800 U CN 218916800U CN 202320063264 U CN202320063264 U CN 202320063264U CN 218916800 U CN218916800 U CN 218916800U
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Abstract
The utility model discloses a slot wedge tightness diagnostic system, which comprises a vibration exciter for knocking a slot wedge, wherein a pickup for collecting sound is arranged beside the vibration exciter; the output end of the pickup is connected with the signal conditioner, and the output end of the signal conditioner is connected with the data acquisition card; the output end of the data acquisition card is connected with a PC, the PC is connected with the data processing module, and the output end of the PC is connected with the vibration exciter; the vibration exciter comprises a square shell, and an L-shaped knocking head is hinged between the left side surface and the right side surface of the shell; a knocking convex point is arranged on the top end surface of the horizontal plate of the knocking head, and a penetrating hole is formed in a bottom plate of the shell corresponding to the knocking convex point; the vertical plate of the knocking head is hinged with a connecting plate, and the other end of the connecting plate is hinged with a pushing rod; the other end of the pushing rod is sleeved with a control box, and a control unit is arranged in the control box. The utility model has the advantages of high mechanization degree, high safety and high accuracy of detection results.
Description
Technical Field
The utility model relates to the technical field of generators, in particular to a slot wedge tightness diagnosis system.
Background
In the power industry, power station equipment is generally used for a longer period of time. The large-sized generator set can lead to loosening of stator slot wedges due to aging, vibration, abrasion and the like in long-term operation. The loose slot wedge makes the stator bar originally pressed under the slot wedge loose, which affects the reliability of the long-term operation of the generator and even causes motor operation accidents. Therefore, the periodic detection of the tightness state of the slot wedge in the stator bore of the generator is of great significance to the normal operation of the motor.
The current detection mode is as follows: the experienced person carries the detection equipment into the generator to manually strike the slot wedge, and the experienced person can judge the tightness degree of the slot wedge by means of listening to the sound by the human ear while striking.
Before detection, the traditional detection method consumes a large amount of manpower and material resources because of the need of extracting the generator rotor, has long detection period and larger loss caused by production stoppage during maintenance; moreover, the detection method lacks objectivity, cannot quantitatively analyze the tightness degree of the slot wedge, and cannot reserve the data record capable of being repeatedly queried.
Therefore, there is a need for a generator slot wedge detection exciter.
Disclosure of Invention
The utility model aims to provide a slot wedge tightness diagnosis system for solving the problems in the background technology.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows.
The slot wedge tightness diagnosis system comprises a vibration exciter for knocking the slot wedge, and a pickup for collecting sound is arranged beside the vibration exciter; the output end of the pickup is connected with the signal conditioner, and the output end of the signal conditioner is connected with the data acquisition card; the output end of the data acquisition card is connected with a PC, the PC is connected with the data processing module, and the output end of the PC is connected with the vibration exciter; the vibration exciter is mounted on the robot when in use, and comprises a square shell, wherein an L-shaped knocking head perpendicular to the left side surface and the right side surface is hinged between the left side surface and the right side surface of the shell, and the right angle part of the L-shaped knocking head is hinged with the left side surface and the right side surface; a knocking convex point which penetrates through the bottom plate of the shell and is used for knocking the slot wedge of the generator is arranged on the top end surface of the horizontal plate of the knocking head, and a penetrating hole is formed in the bottom plate of the shell corresponding to the knocking convex point; the vertical plate of the knocking head is hinged with a connecting plate, and the other end of the connecting plate is hinged with a pushing rod; the other end of the pushing rod is sleeved with a control box and extends out of the control box, and a control unit which drives the pushing rod to horizontally move back and forth relative to the control box through electromagnetic force is arranged in the control box.
According to the technical scheme, the PC comprises a solid state disk, and data acquired by the data acquisition card are stored in the solid state disk of the PC.
Further optimizing the technical scheme, the PC comprises a display screen, and the display screen displays the time domain waveform, the frequency domain waveform and the plane development diagram of the diagnosis result.
According to the further optimized technical scheme, the right-angle part of the knocking head is connected with the left side surface and the right side surface through the first pin shaft, and the right-angle part is provided with a through groove penetrating through the first pin shaft; the end of the knocking head vertical plate is provided with a connecting hole penetrating through the second pin shaft, the middle of the end of the vertical plate is provided with a groove, a connecting plate is sleeved on the second pin shaft positioned in the groove, and the other end of the connecting plate is hinged with a pushing rod through a third pin shaft.
According to the further optimized technical scheme, the control unit comprises a control box arranged in the control box and a circuit board for providing working current for the control box, and the push rod is arranged in the control box in a penetrating way; the push rod outside the control box is sleeved with a spring for restoring the push rod, one end of the spring is fixedly connected with the outer side wall of the control box, and the other end of the spring is fixedly connected with the middle part of the push rod.
According to the further optimized technical scheme, a power module, a signal generator and a power amplifier which are electrically connected in sequence are arranged on the circuit board, and the output end of the power amplifier is connected with the two ends of the control box; an operation button for adjusting the output duty ratio of the signal generator is arranged on the top plate of the shell.
By adopting the technical scheme, the utility model has the following technical progress.
The slot wedge tightness diagnostic system provided by the utility model is used for detecting through the robot auxiliary diagnostic system, so that the labor intensity of workers is reduced, the degree of mechanization is high, and the detection safety is improved; the sound generated by the impact hammer and the slot wedge is collected and processed through the pickup and the signal conditioner matched with the data acquisition card, and then is input into the PC for analysis and recording, so that the accuracy of the detection result is improved.
Drawings
FIG. 1 is a block diagram of the structure of the present utility model;
FIG. 2 is a block diagram of a vibration exciter in the present utility model;
wherein: 1. the device comprises a vibration exciter, 111, an elliptical hole, 12, a knocking head, 121, a connecting hole, 122, knocking convex points, 13, a spring, 14, a connecting plate, 15, a push rod, 16, a control box, 2, a sound pick-up, 3, a data acquisition card, 4, a signal conditioner, 5, a PC, 6 and a data processing module.
Detailed Description
The utility model will be described in further detail with reference to the drawings and the specific embodiments.
The slot wedge tightness diagnosis system is shown in combination with figures 1 to 2 and comprises a vibration exciter 1, a sound pick-up 2, a data acquisition card 3, a signal conditioner 4, a PC 5 and a data processing module 6; the vibration exciter 1 comprises a knocking head 12, a spring 13, a connecting plate 14, a pushing rod 15 and a control box 16.
The square casing of vibration exciter 1, it has the beating head 12 to articulate through first round pin axle between the left and right sides face of casing, beating head 12 is L type, and beating head 12 and side are perpendicular. The right angle part of the knocking head 12 is provided with a through groove 12 penetrating through the first pin shaft, and the tail end of the vertical plate of the knocking head 12 is provided with a connecting hole 121 penetrating through the second pin shaft.
The top end surface of the horizontal plate of the knocking head 12 is provided with knocking convex points 122, and the knocking convex points 122 are hemispherical convex points. The tapping bumps 122 pass through the bottom plate of the housing to tap the generator slot wedges.
A bottom plate of the casing corresponding to the knocking protrusion 122 is provided with a penetration hole so as to facilitate the motion of the knocking head 12. A groove 14 is formed in the middle of the tail end of the vertical plate of the knocking head 12, a connecting plate 14 is sleeved on a second pin shaft positioned in the groove 14, and the other end of the connecting plate 14 is hinged with a pushing rod 15 through a third pin shaft.
A control box 16 is arranged in the shell, and a push rod 15 horizontally passes through the control box 16 and then extends out of the shell. A control unit is provided in the control box 16, and the control unit drives the push rod 15 to horizontally reciprocate relative to the control box by electromagnetic force.
The control unit comprises a control box arranged in the control box 16 and a circuit board providing the control box with an operating current. The pushing rod 15 is penetrated in the control box 16, and when the control box 16 is electrified, a magnetic field is generated to drive the pushing rod 15 to horizontally move. The pushing rod 15 positioned outside the control box 16 is sleeved with a spring 13, one end of the spring 13 is fixedly connected with the outer side wall of the control box 16, and the other end of the spring is fixedly connected with the middle part of the pushing rod 15. When the control box is powered off, the pushing rod 15 is reset under the action of the elastic force of the spring 13.
The circuit board is provided with a power module, a signal generator and a power amplifier which are electrically connected in sequence, and the output end of the power amplifier is connected with two ends of the control box 16. An operation button for adjusting the output duty ratio of the signal generator is arranged on the top plate of the shell, and the knocking frequency of the knocking head is controlled by changing the output duty ratio.
The two side surfaces of the shell are provided with arc elliptical holes 111 which are arranged in parallel relatively and used for guiding the second pin shaft.
A pickup 2 is arranged beside the vibration exciter 1, and the pickup 2 is used for collecting sound. The output of the pickup 2 is connected with a signal conditioner 4, and the output of the signal conditioner 4 is connected with a data acquisition card 3, and the data acquisition card 3 converts sound into a digital signal.
The output end of the data acquisition card 3 is connected with a PC 5, the PC 5 is connected with a data processing module 6, and the output end of the PC 5 is connected with the vibration exciter 1.
The PC 5 comprises a solid state disk, and the data acquired by the data acquisition card 3 are stored in the solid state disk of the PC 5.
The PC 5 includes a display screen on which a time-domain waveform, a frequency-domain waveform, and a planar development of the diagnosis result are displayed.
And selecting three characteristics of 6810-8190Hz frequency band area, center of frequency spectrum based on a vertical axis and peak frequency as fault characteristics of slot wedge tightness to obtain a diagnosis result.
Area of frequency band: dividing frequency band intervals according to the positions of peaks in the amplitude spectrum, respectively calculating the areas of the amplitude spectrums in the intervals, and calculating the frequency band amplitude areas according to the already-defined frequency intervals, wherein the frequency band amplitude areas are the sum of the frequency spectrum amplitudes, and the calculation formula is as follows:
where i, j represent the start and end values of each interval, respectively.
Spectral centroid: the characteristic quantity representing the position of the centroid of the frequency spectrum is related to tone, reflects the brightness of sound, and causes different brightness of the knocked sound due to different tightness of the slot wedge, wherein the centroid (SCy) of the frequency spectrum based on the vertical axis of the frequency spectrum is selected, and the calculation is shown as follows:
the transverse gauge outfit of the plane development diagram of the diagnosis result is 'slot wedge number-state grade', the longitudinal gauge outfit is 'slot number', the state grade is classified into nine grades 1-9 according to industry standards, the higher the grade is, the deeper the fault degree is represented, wherein the grade 1-3 corresponds to the normal green state, the grade 4-6 represents the early warning yellow state, the grade 7-9 represents the fault red state, and the green, yellow and red represent the normal, early warning and fault states of the slot wedge respectively. Clicking the corresponding slot wedge, and popping up the collected time domain signals and the extracted fault characteristics in the form of text boxes. And (5) manually checking the signal to perform secondary confirmation, and checking the next abnormal point after closing the window.
When the vibration exciter is actually used, the slot wedge number is manually input, the vibration exciter 1 is installed on the robot, the robot walks according to a detection route, meanwhile, the PC 5 outputs vibration exciting waveforms to the vibration exciter 1, the control box 16 is connected with a direct-current power supply, when the control box 16 generates a magnetic field to attract the push rod 15 to approach, the spring 13 is compressed, the knocking head 12 rotates around the pin hole, so that the knocking salient point 122 extends out of the bottom plate of the shell and is provided with a penetrating hole, the vibration exciter 1 impacts the slot wedge, and sounds are emitted; when the magnetic force of the control box 16 is eliminated, the spring 13 stretches and recovers, the pushing rod 15 is away from the control box 16, the knocking head 12 is rotated and recovered, and the knocking convex point 122 is separated from the slot wedge to complete one knocking.
The sound quality of the knocked-out sound is different due to the fact that the tightness of the slot wedge is different, the sound signals are picked up by the pickup 2, the pickup 2 sends the sound to the signal conditioner 4, and the data acquisition card 3 connected with the signal conditioner 4 converts the sound into digital signals to be processed by the PC 5. If the average value of the detected signals exceeds a threshold value, displaying a plane development diagram of a diagnosis result and acquired data on a display screen of the PC 5, and simultaneously, automatically storing the data in a solid state disk of the PC 5; after the robot finishes detection, the collected data are extracted to carry out slot wedge tightness fault diagnosis, and the slot wedge tightness diagnosis result is displayed in a plane unfolding diagram mode. Then the robot walks reversely and then sequentially detects and displays the result, and then the detection of the next slot wedge can be performed.
Claims (6)
1. Slot wedge tightness diagnostic system, its characterized in that: the device comprises a vibration exciter (1) for knocking the slot wedge, and a pickup (2) for collecting sound is arranged beside the vibration exciter (1); the output end of the pickup (2) is connected with the signal conditioner (4), and the output end of the signal conditioner (4) is connected with the data acquisition card (3); the output end of the data acquisition card (3) is connected with a PC (5), the PC (5) is connected with a data processing module (6), and the output end of the PC (5) is connected with the vibration exciter (1); the vibration exciter (1) is mounted on the robot when in use, the vibration exciter (1) comprises a square shell, an L-shaped knocking head (12) perpendicular to the left side surface and the right side surface is hinged between the left side surface and the right side surface of the shell, and the right angle part of the L-shaped knocking head (12) is hinged with the left side surface and the right side surface; a knocking convex point (122) penetrating through the bottom plate of the shell and used for knocking the slot wedge of the generator is arranged on the top end surface of the horizontal plate of the knocking head (12), and a penetrating hole is formed in the bottom plate of the shell corresponding to the knocking convex point (122); the vertical plate of the knocking head is hinged with a connecting plate (14), and the other end of the connecting plate (14) is hinged with a pushing rod (15); the other end of the pushing rod (15) is sleeved with a control box (16) and extends out of the control box (16), and a control unit which drives the pushing rod (15) to move horizontally back and forth relative to the control box (16) through electromagnetic force is arranged in the control box (16).
2. The slot wedge tightness diagnostic system of claim 1 wherein: the PC (5) comprises a solid state disk, and the data acquired by the data acquisition card (3) are stored in the solid state disk of the PC (5).
3. The slot wedge tightness diagnostic system of claim 2 wherein: the PC (5) comprises a display screen, and a plane expansion diagram of the time domain waveform, the frequency domain waveform and the diagnosis result is displayed on the display screen.
4. The slot wedge tightness diagnostic system of claim 1 wherein: the right-angle part of the knocking head (12) is connected with the left side surface and the right side surface through a first pin shaft, and a through groove penetrating through the first pin shaft is formed in the right-angle part; the end of the vertical plate of the knocking head (12) is provided with a connecting hole (121) penetrating through the second pin shaft, the middle of the end of the vertical plate is provided with a groove, a connecting plate (14) is sleeved on the second pin shaft positioned in the groove, and the other end of the connecting plate (14) is hinged with a pushing rod (15) through a third pin shaft.
5. The slot wedge tightness diagnostic system of claim 4 wherein: the control unit comprises a control box (16) arranged on the control box (16) and a circuit board for providing working current for the control box (16), and the push rod (15) is arranged in the control box (16) in a penetrating way; the push rod (15) positioned at the outer side of the control box (16) is sleeved with a spring (13) for restoring the push rod (15), one end of the spring (13) is fixedly connected with the outer side wall of the control box (16), and the other end is fixedly connected with the middle part of the push rod (15).
6. The slot wedge tightness diagnostic system of claim 5 wherein: the circuit board is provided with a power module, a signal generator and a power amplifier which are electrically connected in sequence, and the output end of the power amplifier is connected with the two ends of the control box (16); an operation button for adjusting the output duty ratio of the signal generator is arranged on the top plate of the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320063264.6U CN218916800U (en) | 2023-01-10 | 2023-01-10 | Slot wedge tightness diagnostic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320063264.6U CN218916800U (en) | 2023-01-10 | 2023-01-10 | Slot wedge tightness diagnostic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218916800U true CN218916800U (en) | 2023-04-25 |
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ID=86046290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320063264.6U Active CN218916800U (en) | 2023-01-10 | 2023-01-10 | Slot wedge tightness diagnostic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218916800U (en) |
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2023
- 2023-01-10 CN CN202320063264.6U patent/CN218916800U/en active Active
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