CN107941526B - Abnormal sound detection equipment for automobile instrument panel assembly of assembly line - Google Patents
Abnormal sound detection equipment for automobile instrument panel assembly of assembly line Download PDFInfo
- Publication number
- CN107941526B CN107941526B CN201711366154.2A CN201711366154A CN107941526B CN 107941526 B CN107941526 B CN 107941526B CN 201711366154 A CN201711366154 A CN 201711366154A CN 107941526 B CN107941526 B CN 107941526B
- Authority
- CN
- China
- Prior art keywords
- vibration
- instrument panel
- sound
- panel assembly
- sound box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 238000010030 laminating Methods 0.000 claims 1
- 230000002950 deficient Effects 0.000 abstract description 3
- 238000012216 screening Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 210000005069 ears Anatomy 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The invention discloses abnormal sound detection equipment for an automobile instrument panel assembly of a production line, which comprises a tool fixture for bearing the automobile instrument panel assembly, a conveyor belt for conveying the tool fixture, a vibration generator, a jacking mechanism for driving the vibration generator to move in the vertical direction, and a closed sound detection box for detecting sound; the device can accurately measure the sound generated by the automobile instrument panel assembly on the vibration value of each frequency through a digital means, and can find defective products through accurate comparison of computers, so that the aim of detecting and screening is fulfilled.
Description
Technical Field
The invention relates to the field of detection equipment, in particular to automobile instrument panel assembly abnormal sound detection equipment for a production line.
Background
The first diagram shows a schematic diagram of the structure of the automobile instrument panel assembly, including an instrument panel bottom case 101, an instrument 106, an instrument pointer 105, a circuit board 102, a number plate 103 and a panel cover 104. One or more physical meters such as an ammeter, a water thermometer, an engine oil pressure meter, a fuel gauge, a speedometer, an engine tachometer and the like are arranged on a traditional automobile instrument panel; a series of digital display devices are added to the modern automobiles to be used for displaying the reading number of the instrument; the various instruments and devices mentioned above are mainly fixed on the automobile instrument panel by means of adhesive bonding, screw reinforcement and other fastening modes. In the running process of the automobile, the instrument panel is inevitably subjected to vibration with various frequencies, and if the instrument and the device are not firmly fixed or loose due to overlarge stress during resonance, serious faults such as instrument collision and the like can be caused, so that the instrument panel is required to be subjected to vibration detection in the production stage.
At present, the vibration test of the instrument panel in the automobile industry mainly judges whether the instrument panel is abnormal in vibration through the human ears, so as to judge whether the instrument and the device are fastened or not, and whether touch occurs between each instrument and each device or not.
Judging that abnormal sound exists in a plurality of defects through human ears: the abnormal sound judging mode is subjective judgment, so that the situation of judging errors possibly occurs, and the workload is increased in the reinspection; the capture range of the sound of the human ear is limited, and abnormal sounds which do not need the receiving range of the frequency of the human ear can not be easily found; the manual operation is difficult to ensure that the time of each operation is the same, so that the beat of the production line is not uniform; some of the unobvious fastening problems are not easily checked by human ear detection, such as instrument panels, and some assemblies with meters that are not fastened in place resonate at a certain vibration frequency, which if the vibration frequency is the frequency that is commonly reached during the running of an automobile, can result in increased loosening of the instruments and devices inside the instrument panel assembly after long-term operation.
Therefore, a device suitable for assembly line production, accurate in sound detection and wide in sound detection frequency is required to detect abnormal sounds of the automobile instrument panel assembly.
Disclosure of Invention
In order to overcome the problems, the invention provides the abnormal sound detection equipment for the automobile instrument panel assembly of the assembly line, which can accurately measure the sound generated by the automobile instrument panel assembly on the vibration value of each frequency through a digital means, and can find defective products through accurate comparison of computers, thereby achieving the purpose of detection and screening.
The invention provides automobile instrument panel assembly abnormal sound detection equipment for a production line, which comprises a tool fixture for bearing an automobile instrument panel assembly, a conveyor belt for conveying the tool fixture, a vibration generator, a jacking mechanism for driving the vibration generator to move in the vertical direction, and a sound box for detecting sound; the tool fixture on the conveyor belt is conveyed to the vibration generator, the jacking mechanism jacks up the vibration generator, and the tool fixture is jacked up to the sound measuring box arranged above.
The automobile instrument panel assembly comprises an instrument panel shell and one or more instrument parts fixed on the instrument panel shell; the instrument panel shell is fixed on the tool fixture.
The jacking mechanism comprises a base, a horizontally arranged top plate, a guide pillar for guiding in the vertical direction and a hydraulic cylinder; the hydraulic cylinder body is fixed on the base, and a piston rod of the hydraulic cylinder is connected with the top plate; one end of the guide post is fixed on the top plate, and the other end of the guide post penetrates through the base.
The vibration generator comprises a vibration controller for controlling the vibration frequency, a power amplifier for amplifying a control signal of the vibration controller, and a vibration table for generating vibration;
the vibrating table comprises a vibrating base and a table top, and the vibrating base is connected with the table top through four connecting rods distributed on the top angle;
the vibration base is arranged on the top plate and is connected with the power amplifier; a vibration sensor connected with the vibration controller is arranged on the table top;
the power amplifier is connected with the vibration controller.
The table top is provided with an electromagnetic chuck.
The sound box comprises a box-shaped sound box shell with an open bottom surface, a sponge attached to the inner wall of the sound box shell and one or more microphones corresponding to the number of the meters; the microphone fixing position is arranged right above the position where the instrument is located after the tool fixture is lifted to the closed side loudspeaker box.
The microphone is connected to a computer for audio analysis located outside the sound box.
And a sponge is filled between the sound box shell and the inner wall and the top plate of the sound box at a position where the sound box shell is not installed by the instrument.
The top plate contour is matched with the bottom surface open surface contour of the sounding box, and after the hydraulic cylinder lifts the vibrating table, the periphery of the top plate is attached to the inner wall of the sounding box to form a closed inner cavity.
The invention provides a device for detecting abnormal sound of an automobile instrument panel assembly for a production line, which can accurately measure sound generated by the automobile instrument panel assembly on vibration values of various frequencies through a digital means, and can find defective products through accurate comparison of computers, so that the aim of detecting and screening is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows an exploded view of a three-dimensional structure of an instrument panel;
FIG. 2 is a three-dimensional view showing an abnormal sound detecting apparatus for an automobile instrument panel assembly for a pipeline of the present embodiment;
fig. 3 shows a front view of the jack-up mechanism of the present embodiment;
FIG. 4 is a schematic diagram showing the connection of the vibration generator of the present embodiment;
fig. 5 shows a schematic diagram of the vibrating table of the present embodiment;
fig. 6 shows a half sectional view of the automobile instrument panel assembly abnormal sound detection apparatus for the flow line of the present embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 shows a schematic three-dimensional structure of an instrument panel, in which an instrument panel top cover 104 is fastened to an instrument panel bottom case 101 by a snap, and the embodiment of the invention is mainly aimed at detecting an instrument panel assembly without the instrument panel top cover 104.
Embodiment one:
fig. 2 is a three-dimensional view showing an abnormal sound detecting apparatus for an automobile instrument panel assembly for a pipeline of the present embodiment. The embodiment of the invention provides a device for detecting abnormal sound of an automobile instrument panel assembly for a production line, which comprises a tool fixture 202 for bearing an automobile instrument panel assembly 207, a conveyor belt 201 for conveying the tool fixture, a vibration generator 203, a jacking mechanism 204 for driving the vibration generator to move in the vertical direction, and a closed sound detecting box 205 for detecting sound.
The conveyor belt 201 in the embodiment of the invention is a roller conveyor belt, the tooling jig 202 is a rectangular flat plate, and an instrument panel assembly is fixed on the tooling jig 202.
The conveyor belt 201 conveys the tool jig 202 to the vibration generator 203, and before the tool jig 202 reaches the vibration generator 203, positioning is performed by guide blocks 206 arranged at both ends above the drum.
After the tool fixture 202 is transported to the vibration generator 203, the jack-up mechanism 204 jacks up the tool fixture 202 into the closed-side sound box 205, and performs the sounding process.
Embodiment two:
fig. 3 shows a front view of the jack-up mechanism of the present embodiment. The jacking mechanism comprises a base 301, a horizontally arranged top plate 303, a guide pillar 302 for guiding in the vertical direction and a hydraulic cylinder 304; the hydraulic cylinder 304 body is fixed on the base, and a piston rod is connected with the top plate 303; one end of the guide post 302 is fixed on the top plate 303, and the other end passes through the base 301; in order to limit the upward jacking height, a limit nut 305 is additionally arranged at the lower end of the guide post 302; because the base 301 and the top plate 303 are rectangular, the lengths of the adjacent sides are not equal, and in order to avoid errors in the installation direction, the installation positions of the four guide posts 302 are asymmetric.
Embodiment III:
fig. 4 shows a schematic diagram of the connection of the vibration generator of the present embodiment. The vibration generator comprises a vibration controller 401 for controlling a vibration frequency, a power amplifier 402 for amplifying a control signal of the vibration controller, and a vibration generator for generating vibration; the vibration controller 401 used in the embodiment of the present invention is a computer; since the vibration controller 401 and the power amplifier 402 are installed outside the pipeline, they are not shown in fig. 1.
The vibration generator comprises a vibration base 404 and a table top 403, wherein the vibration base 404 is connected with the table top 403 through four connecting rods 406 distributed on the top angle;
the vibration base 404 is installed on the top plate and connected with a power amplifier; a vibration sensor 405 connected with the vibration controller 401 is arranged on the table top;
the power amplifier 402 is connected to the vibration controller 401.
Fig. 5 shows a schematic diagram of the vibrating table of the present embodiment. The table top 403 is integrally connected with the connecting rod 406, and the connecting rod 406 extends into the air gap of the vibration base 404; a driving coil 501 is arranged at one end of the connecting rod 406 extending into the air gap, a permanent magnet 502 with magnetism is arranged around the air gap, and the permanent magnet 502 generates a fixed magnetic field 503; when the direction of the driving coil 501 is changed, that is, the direction of the force to which the driving coil 501 is subjected is changed; when the current direction of the driving coil 501 is changed at a change speed of a certain frequency, the table top 403 can be driven to generate vibration of a certain frequency.
Embodiment four:
when the vibration table vibrates, the tool fixture may be moved on the vibration table, so that the tool fixture needs to be fixed. The fixing mode adopted by the embodiment is a magnetic fixing mode, the table top is provided with an electromagnetic chuck 504, and the fixture jig can be fixed and loosened by controlling the on-off of the electromagnetic chuck 504.
Fifth embodiment:
FIG. 6 is a half sectional view showing an abnormal sound detecting apparatus for an automobile instrument panel assembly for a flow line of the present embodiment; the sound box comprises a box-shaped sound box shell 600 with an open bottom surface, a sponge 601 attached to the inner wall of the sound box shell and one or more microphones 602 corresponding to the number of the meters; the microphone 602 is fixed at a position right above the position of the instrument after the tool fixture is lifted to the closed side sound box.
The microphone 602 is connected to a computer for audio analysis located outside the sound box.
And a sponge 601 is filled between the sound box shell and the inner wall and the top plate of the sound box at a position where the sound box shell is not installed by the instrument.
The outline of the top plate 303 is matched with the outline of the bottom surface open surface of the sound box shell 600, and after the hydraulic cylinder 304 lifts the vibration table, the periphery of the top plate 303 is attached to the inner wall of the sound box.
In actual operation, the automobile instrument assembly 207 is firstly fixed on the tool fixture 202, and then is transported to a table top 403 of a vibration table positioned behind the conveyor belt 201 along with the tool fixture 202 by the conveyor belt 201, and an electromagnetic chuck 504 on the table top 403 of the vibration table is started to suck the tool fixture 202 tightly; at this time, the hydraulic cylinder 304 is started to jack up the whole vibrating table into the sound measuring box, wherein the periphery of the top plate 303 is attached and sealed with the inner wall of the sound measuring box shell 600 to form a sealed inner cavity; the sound absorbing sponge is filled around the automobile instrument assembly 207, wherein a cavity is arranged above the fixed position of the instrument, and a microphone 602 is arranged on the cavity.
Then, the vibration controller starts to send a vibration signal to the power amplifier, the power amplifier amplifies the vibration signal and drives the vibration base 404 to start to vibrate, the vibration frequency is detected by the vibration sensor 405, and the test frequency is gradually changed from 10Hz to 2000 Hz; during the vibration frequency variation process, each microphone 602 records sound frequency data to a computer, and the computer analyzes the sound data of each microphone 602; when the sound data captured by a certain microphone 602 is inconsistent with the standard frequency spectrum or is not in the standard range, that is, the situation that the instrument corresponding to the microphone 602 is possibly not fixed in place is indicated, the detection should be repeated; the test time on the resonance frequency should be correspondingly prolonged to test whether the resonance frequency affects the instrument loosening;
after the above steps are finished, the hydraulic cylinder 304 drives the vibration table to descend, and one-time action is finished.
The abnormal sound detection equipment for the automobile instrument panel assembly of the embodiment of the invention ensures the reliability and the accuracy of the test result through computer sounding, and makes corresponding automatic modification on the sounding mechanism, thereby being applicable to the production line, being beneficial to accelerating the production efficiency and reducing the labor cost.
The foregoing has described in detail the apparatus for detecting abnormal sound of an automobile instrument panel assembly for a production line provided by the embodiment of the present invention, and specific examples have been applied herein to illustrate the principles and embodiments of the present invention, where the foregoing description of the embodiment is only for helping to understand the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (4)
1. The abnormal sound detection equipment for the automobile instrument panel assembly of the assembly line is characterized by comprising a tool fixture for bearing the automobile instrument panel assembly, a conveyor belt for conveying the tool fixture, a vibration generator, a jacking mechanism for driving the vibration generator to move in the vertical direction and a sound detection box for detecting sound; the tool fixture on the conveyor belt is conveyed to the vibration generator, the jacking mechanism jacks the vibration generator, and the tool fixture is jacked into the sound measuring box arranged above;
the jacking mechanism comprises a base, a horizontally arranged top plate, a guide pillar for guiding in the vertical direction and a hydraulic cylinder; the hydraulic cylinder body is fixed on the base, and a piston rod of the hydraulic cylinder is connected with the top plate; one end of the guide post is fixed on the top plate, and the other end of the guide post penetrates through the base;
the vibration generator comprises a vibration controller for controlling the vibration frequency, a power amplifier for amplifying a control signal of the vibration controller, and a vibration table for generating vibration; the vibrating table comprises a vibrating base and a table top, and the vibrating base is connected with the table top through four connecting rods distributed on the top angle; the vibration base is arranged on the top plate and is connected with the power amplifier; a vibration sensor connected with the vibration controller is arranged on the table top; the power amplifier is connected with the vibration controller; the table top is provided with an electromagnetic chuck;
the sound box comprises a box-shaped sound box shell with an open bottom surface, a sponge attached to the inner wall of the sound box shell and one or more microphones corresponding to the number of meters; the microphone fixing position is arranged right above the position where the instrument is located after the tooling fixture is lifted to the side sound box;
the contour of roof with the open face contour of bottom surface of sound box cooperatees, the pneumatic cylinder will after the shaking table jack-up, the roof periphery with sound box inner wall laminating forms airtight inner chamber.
2. The apparatus for in-line vehicle instrument panel assembly abnormal sound detection of claim 1, wherein the vehicle instrument panel assembly comprises an instrument panel housing and one or more instrument parts secured to the instrument panel housing; the instrument panel shell is fixed on the tool fixture.
3. The apparatus for in-line vehicle instrument panel assembly abnormal sound detection of claim 1, wherein the microphone is connected to a computer for audio analysis located outside the sound box.
4. The apparatus for detecting abnormal sound of an automotive instrument panel assembly for a production line of claim 1, wherein a sponge is filled between the non-instrument mounting position of the sound box housing and the inner wall of the sound box and the top plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711366154.2A CN107941526B (en) | 2017-12-18 | 2017-12-18 | Abnormal sound detection equipment for automobile instrument panel assembly of assembly line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711366154.2A CN107941526B (en) | 2017-12-18 | 2017-12-18 | Abnormal sound detection equipment for automobile instrument panel assembly of assembly line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107941526A CN107941526A (en) | 2018-04-20 |
| CN107941526B true CN107941526B (en) | 2023-11-17 |
Family
ID=61943729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711366154.2A Active CN107941526B (en) | 2017-12-18 | 2017-12-18 | Abnormal sound detection equipment for automobile instrument panel assembly of assembly line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107941526B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113483884B (en) * | 2021-06-21 | 2023-09-26 | 深圳市优瑞特检测技术有限公司 | Vibration abnormal sound testing device for package detection and detection method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0219738A (en) * | 1988-07-07 | 1990-01-23 | Nissan Motor Co Ltd | Inspecting method of vehicle and vibrating device used therefor |
| CN1108206A (en) * | 1993-08-05 | 1995-09-13 | 神钢电机株式会社 | Apparatus for supplying units by vibration |
| CN2847246Y (en) * | 2005-10-28 | 2006-12-13 | 中国海洋大学 | Muscial instrument audio frequency characteristic resonance meter |
| CN103090965A (en) * | 2013-01-16 | 2013-05-08 | 广州市中新塑料有限公司 | Automotive upholstery vibration noise detection method and muting device |
| KR20160079438A (en) * | 2014-12-26 | 2016-07-06 | (주)세종이엠시 | Method of abnormal sound measuring and its measuring device of power seat assembly for vehicle |
-
2017
- 2017-12-18 CN CN201711366154.2A patent/CN107941526B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0219738A (en) * | 1988-07-07 | 1990-01-23 | Nissan Motor Co Ltd | Inspecting method of vehicle and vibrating device used therefor |
| CN1108206A (en) * | 1993-08-05 | 1995-09-13 | 神钢电机株式会社 | Apparatus for supplying units by vibration |
| CN2847246Y (en) * | 2005-10-28 | 2006-12-13 | 中国海洋大学 | Muscial instrument audio frequency characteristic resonance meter |
| CN103090965A (en) * | 2013-01-16 | 2013-05-08 | 广州市中新塑料有限公司 | Automotive upholstery vibration noise detection method and muting device |
| KR20160079438A (en) * | 2014-12-26 | 2016-07-06 | (주)세종이엠시 | Method of abnormal sound measuring and its measuring device of power seat assembly for vehicle |
Non-Patent Citations (1)
| Title |
|---|
| 车辆零部件试验用六自由度振动台技术;段鲁男;《2007中国汽车工程学会年会论文集 》;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107941526A (en) | 2018-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10197438B2 (en) | Device and method for testing impedance characteristic and expansion performance of sound absorption material | |
| CN103248993B (en) | Sound equipment abnormal sound checkout gear | |
| CN104266749A (en) | Device and method for offline detecting NVH (Noise Vibration and Harshness) of vehicle generator | |
| CN104776963A (en) | Acoustic excitation non-contact modal testing system and method | |
| CN205946169U (en) | Loudspeaker diaphragm F0 testing arrangement | |
| CN107941526B (en) | Abnormal sound detection equipment for automobile instrument panel assembly of assembly line | |
| CN203337352U (en) | Eddy current sensor multi-channel dynamic calibration device | |
| CN207689108U (en) | Structure dynamic tests system | |
| CN202255770U (en) | Testing tooling and testing system for air tightness of loudspeaker module | |
| US10488300B2 (en) | Vibration exciter | |
| CN100567914C (en) | Testing tone key of musical box is with sensor and proving installation | |
| CN107748068A (en) | A kind of power transmission shaft vibration test system | |
| CN206573247U (en) | Blast impulse mechanical effect target and electrical measuring method superpressure comprehensive test device | |
| CN106226177B (en) | Extra-high voltage direct current composite wall bushing internal and external anti-seismic testing device and testing method | |
| CN104316728A (en) | Method for calibrating sensitivity of multiple sensors | |
| CN207730453U (en) | A kind of automobile instrument disc assembly abnormal sound detection device for assembly line | |
| CN205902075U (en) | Terminal equipment's audio frequency characteristic test silence case | |
| CN110784815A (en) | Device and method for testing acoustic performance of product | |
| WO1998023938A1 (en) | A quality control system for testing mechanical devices | |
| JP5530333B2 (en) | Anti-vibration device inspection method and inspection device | |
| CN113483884A (en) | Vibration abnormal sound testing device for package detection and detection method thereof | |
| CN112014045A (en) | Vibration inspection device for electromechanical equipment production and use method thereof | |
| KR102205277B1 (en) | Detection sensor installation structure of acoustic resonance nondestructive testing device | |
| CN109443780A (en) | A method of engine is detected by echo test method and inflates pressure | |
| CN217059358U (en) | Multifunctional testing equipment for electric vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |