CN201464425U - Device for automatically detecting quality of brake pads - Google Patents
Device for automatically detecting quality of brake pads Download PDFInfo
- Publication number
- CN201464425U CN201464425U CN2009201244366U CN200920124436U CN201464425U CN 201464425 U CN201464425 U CN 201464425U CN 2009201244366 U CN2009201244366 U CN 2009201244366U CN 200920124436 U CN200920124436 U CN 200920124436U CN 201464425 U CN201464425 U CN 201464425U
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- brake block
- travelling belt
- brake
- optoelectronic switch
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- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000012216 screening Methods 0.000 claims abstract description 8
- 230000005693 optoelectronics Effects 0.000 claims description 36
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000010009 beating Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 7
- 230000007246 mechanism Effects 0.000 abstract description 4
- 230000002950 deficient Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 10
- 230000004044 response Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a device for automatically detecting the quality of brake pads. The device comprises a brake pad conveying mechanism, a multi-point automatic knocking module, a voice acquisition and processing module and a brake pad screening module; a brake pad conveying module conveys the brake pads to the voice acquisition and the screening parts behind by adopting a narrow conveying belt; an upward supporting device for the brake pads upwards supports the brake pads conveyed to a knocking position to the lower part of a knocking hammer, and the brake pads can be exactly knocked by the knocking hammer; the multi-point automatic knocking hammer automatically knocks a plurality of position points in sequence, and voice signals acquired by a pickup of the voice acquisition and processing module enter a computer to be processed and further judge the quality of the brake pads; and finally, the brake pads with the poor quality are rejected by the screening module according to the processing results. The automatic detection device can quickly, automatically and accurately screen the brake pads with the poor quality, thereby saving lots of manpower and material resources, and also avoiding the false detection phenomenon of the manual detection. Furthermore, the automatic detection device can be also used for detecting the quality of other workpieces.
Description
Technical field
The utility model relates to a kind of device of Non-Destructive Testing quality of brake pad, especially relates to a kind of automatic detection device for quality of brake pad.
Background technology
Most important security system on the automobile is exactly a brake system, and all brake components all are safety members.The friction pair that the braking of automobile has mainly utilized friction force that braking brake block and brake flange press generation mutually to form produces braking moment, and the kinetic energy of automobile is changed into heat energy, the temperature of brake block and brake flange 300～400 degree that can rise when brake this moment.Therefore the usability to brake block requires high in application.At any time may cause the brake system collapse during the defective brake block of quality uses and brewage traffic accident.After the brake block manufacturing is finished, need every brake block is carried out quality testing, guarantee " zero-fault ".
The defective of brake block is mainly derived from the manufacture process.The manufacturing of brake block is that the potpourri that multiple fiber prescription evenly mixes is carried out extrusion modling under High Temperature High Pressure.But since in the process of mix inhomogeneous batching or mix the brake block that factor such as not thorough causes pushing out and may exist the inhomogeneous or inner defective that the cavity is arranged of quality.These defectives must detect in the quality inspection process.
Present most of brake block manufacturing plant is adopting simply to pound with a hammer judges the quality of quality of brake pad by people's ear listening.It is different that sound that send after having cavity or the inhomogeneous place of material to knock brake block inside and specification product same position are knocked the sound that sends.This detection method is simple, but needs the extremely abundant workman of experience to come listening to judge that human resources consumption is bigger.The workman often knocks two or three time at random, just judges whether defectiveness of brake block by this sound, and the dynamics of knocking all can not better controlled with beating position, therefore can not get access to defective information accurately like this.And thereby messenger can cause the hearing ability drop or produce phonism owing to fatigue badly influencing judged result under long-time the detection.So the method for this manual detection not only will consume great amount of manpower but also can not accurately judge the result.
Someone proposes to adopt the method for ultrasonic scanning to judge whether defectiveness.The shape of brake block is an arc, so must adopt ultrasonic curved surface scanning, scan area need cover the area of monoblock brake block, and scanning process more complicated and ultrasonic curved surface scanning cost are very big.And some circular holes itself are arranged on brake block, also these holes can be included during scanning, the existence in these holes will make handles Scan Architecture complexity more.It is consuming time a lot of to scan a brake block, and the quality inspection of brake block is full inspection.Will cause detection efficiency very low but cost is very high like this.
Summary of the invention
The utility model provides a kind of automatic detection device for quality of brake pad, by a plurality of fixed positions again brake block being knocked and gathers acoustic signals, and signal analyzed and realizes Non-Destructive Testing.
The technical solution adopted in the utility model is:
The utility model is provided with the steel shelf in soundproof box, the steel shelf is placed in the travelling belt top, the travelling belt width is less than the width of brake block, guide rail is fixed on the both sides of steel shelf along the travelling belt direction, on two guide rails respectively symmetric arrangement three knocking devices are arranged, each knocking device can move freely and fix at slide block, the receiving end of first pair of correlation optoelectronic switch is separately fixed at the travelling belt both sides with transmitting terminal, make be transported to that the brake block that knocks the hand hammer below in the knocking device can block that correlation optoelectronic switch transmitting terminal sends light, the supporting plate horizontal positioned also is fixed on the telescopic shaft of brake block pop-up cylinder, brake block pop-up cylinder and supporting plate are placed on the travelling belt below, supporting plate is installed support stick respectively along the both sides of conveyer belt, and the support stick width of both sides is greater than the width of travelling belt, the second pair of correlation optoelectronic switch place first pair of correlation optoelectronic switch directly over, the feasible light that when brake block is held in the palm beating position, can block second pair of correlation optoelectronic switch just, brake block screening module is the cylinder that is used to reject by, the 3rd pair of correlation optoelectronic switch and a V font handgrip are formed; V font handgrip is fixed on the cylinder telescopic shaft end that is used to reject, the 3rd pair of correlation optoelectronic switch lies against the travelling belt both sides, the direction back-end location that transmit along travelling belt at the cylinder that is used to reject the position of the 3rd pair of correlation optoelectronic switch, make when the brake block that sends blocks the light path of the 3rd pair of correlation optoelectronic switch just, the elongation of the extension arm of the cylinder that is used to reject can be pushed brake block open, acoustic pickup is placed on the top of knocking device, is connected with computing machine by the sound collection card of lead-in wire outside soundproof box.
Described supporting plate has a plurality of threaded holes along the both sides of conveyer belt, and support stick can match with a plurality of threaded holes respectively, holds up the brake block of different size.
Described knocking device comprises and knocks the short U-shaped elastic arm of hand hammer, armature and a length of side on one side, knocks hand hammer and is installed in U-shaped elasticity brachium limit medial surface, and armature is installed in the arc end medial surface of U-shaped elastic arm, and U-shaped elastic arm minor face is fixed on the slide block.
The beneficial effects of the utility model are:
Knock the frequency response that sound has reflected brake block bucketing hammer after knocking brake block, frequency response that the defective brake block of quality knocks hand hammer and up-to-standard brake block are distinguished to some extent to the frequency response that hand hammer knocks.By gathering its voice signal, signal is carried out fast fourier transform, behind wavelet transformation and the analysis of spectrum, can identify the quality of brake pad quality.This method simple and fast, cost is lower, and extensibility is better, when need increasing brake block model to be checked, only need " learn " once before detection and data storing is got up to get final product.The utility model can be used for detecting the quality of brake block, and its advantage is to filter out the defective brake block of quality fast and automatically, accurately, has saved lot of manpower and material resources, has also avoided the flase drop phenomenon of manual detection.The utility model can also be used to detecting the quality of other workpiece.
Description of drawings
Fig. 1 is the one-piece construction schematic diagram of automatic detection device for quality of brake pad.
Fig. 2 is a brake block pop-up apparatus structure schematic diagram in the automatic detection device for quality of brake pad.
Fig. 3 is the structure principle chart of knocking device in the automatic detection device for quality of brake pad.
Among the figure: 1, brake block, 2, travelling belt, 3, the steel shelf, 4, guide rail, 5, slide block, 6, the U-shaped elastic arm, 7, armature, 8, knock hand hammer, 9, first pair of correlation optoelectronic switch, 10, second pairs of correlation optoelectronic switches, 11, V font handgrip, 12, the 3rd pair of correlation optoelectronic switch, 13, the cylinder that is used to reject, 14, soundproof box, 15, support stick, 16, supporting plate, 17, brake block pop-up cylinder, 18, acoustic pickup, 19, the sound collection card, 20, computing machine.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Principle of the present utility model is:
The brake block connecting gear transmits brake block to be checked, fix a soundproof box in the centre position of delivery module, connecting gear transmits brake block to be checked and passes soundproof box, multipoint mode is knocked module automatically a plurality of location points of the brake block that sends is knocked in the soundproof box, place in the soundproof box and be used to gather the acoustic pickup of knock tone signal, acoustic pickup is gathered the sound that knocks each time respectively and is sent voice signal to computing machine by microprocessor controls, by computer processing data and judge whether defectiveness of workpiece by analysis. and the terminal horizontal of connecting gear is placed brake block screening module and is used to reject the defective brake block of quality.
Reflect the frequency response that workpiece knocks hand hammer in fact by the sound that knocks the workpiece acquisition.Inhomogeneous or middle when the cavity is arranged when the brake block defectiveness such as quality, knock the signal that mixes of the signal that can significantly sneak into a low frequency in the voice signal that sends in defective zone or some other frequency.This also is a main basis for estimation of the present utility model.The utility model will be before work the various models of typing be judged as the sound that qualified brake block sample knocks, and every sample selects the easiest a plurality of positions that defective occurs and can cover whole brake block to knock the other typing sound of cutting respectively, these sound is numbered deposit in calculator memory.When detecting, will wait for contrast available from the moving acoustic information that knocks that accesses the brake block sample of this model after importing the model of brake block to be checked.For the position of knocking, the beating position of every kind of model all is that fixing not allowing changes.Need knock hammer in strict accordance with certain location arrangements before the work, can not at will change in the course of work.
The brake block connecting gear mainly is made up of narrower travelling belt.Above brake block lies in, deliver to aft section by travelling belt and carry out the sound typing.Because brake block can not be placed directly on the travelling belt when knocking and knock, the voice signal that collects like this can be sneaked into the frequency response that is sent to mechanism and be caused certain influence to judgement, so when knocking, must brake block be got on from the travelling belt upper support with supporting mechanism, so need use narrow travelling belt, support stick can get up the brake block pop-up from the travelling belt both sides like this.
Multipoint mode is knocked module automatically and is placed in the soundproof box, by soundproof box, and the steel shelf, guide rail, slide block, the U-shaped elastic arm, armature knocks hand hammer, the correlation optoelectronic switch, brake block pop-up cylinder, supporting plate, support stick is formed.Through statistical study, the position that is prone to defective is in the place of brake block by both sides.
The utility model has selected a plurality of beating positions to carry out knocking successively, differentiates whether defectiveness of brake block by analyzing these sound that knock that are prone to defective locations.Because the brake block size that needs to detect has nothing in common with each other, so the position that need knock is also all inequality, here knocking hand hammer is fixed on the U-shaped bullet surname arm, U-shaped elastic arm installed inside upper armature, can make U-shaped elastic arm generation deformation by the two-stage power on/off that makes coil on the armature like this, realize the process of knocking.And the U-shaped spring arm by screw retention on slide block, regulate the position of beating point by the distance of adjusting slider on guide rail.In when work, just do not allow to change again after well for the position adjustments of the brake block slide block of same model.When the light path of correlation optoelectronic switch transmitting terminal is transmitted brake block that band sends and blocks, this moment, the brake block pop-up cylinder of brake block below will extend automatically, and four support sticks erectting on the supporting plate rise to brake block picking-up steadily and knock the position that hand hammer can knock.Four support sticks are to couple together by the screw thread of an end and the screw on the supporting plate, diverse location on supporting plate has the threaded hole of identical size, can conveniently adjust the position of support stick, can hold up the brake block of different size like this and guarantee that brake block can be stabilized picking-up.When work, the support stick position adjusted back before brake block model change to be checked its position do not allow change.The support stick support end adopts rubber or felt materials, because need friction disc is unsettled when knocking, if the support stick metal material directly contacts with the brake block rigidity, the sound that knocks will be sneaked into the frequency response of support stick and supporting plate, not only can increase the stiction that picks out but also can reduce the noise composition that reacts the brake block frequency response with felt or rubber material.
The sound collection processing module is by acoustic pickup, the sound collection card, computing machine is formed, acoustic pickup is installed in the soundproof box, be used for gathering the knock tone signal, the sound collection card cooperates acoustic pickup that voice signal is converted to the digital signal of computer Recognition, and gets up signal storage then that computing machine carries out Treatment Analysis to signal.
Brake block screening module is made up of a cylinder and a V font handgrip.Control cylinder is flexible can reject away brake block from travelling belt.
Concrete structure of the present utility model is:
As shown in Figure 1, steel shelf 3 is set in soundproof box 14, steel shelf 3 is placed in travelling belt 2 tops, travelling belt 2 width are less than the width of brake block 1, guide rail 4 is fixed on the both sides of steel shelf 3 along travelling belt 2 directions, on two guide rails 4 respectively symmetric arrangement three knocking devices are arranged, each knocking device can move freely and fix at slide block 5, the receiving end of first pair of correlation optoelectronic switch 9 is separately fixed at travelling belt 2 both sides with transmitting terminal, make be transported to that the brake block 1 that knocks hand hammer 8 belows in the knocking device can block that correlation optoelectronic switch 9 transmitting terminals send light, supporting plate 16 horizontal positioned also are fixed on the telescopic shaft of brake block pop-up cylinder 17, brake block pop-up cylinder 17 and supporting plate 16 are placed on travelling belt 2 belows, supporting plate 16 is installed support stick 15 respectively along the both sides that travelling belt 2 moves, and support stick 15 width of both sides are greater than the width of travelling belt 2, the second pair of correlation optoelectronic switch 10 place first pair of correlation optoelectronic switch 9 directly over, the feasible light that when brake block 1 is held in the palm beating position, can block second pair of correlation optoelectronic switch 10 just, brake block screening module is by a cylinder that is used to reject 13, the 3rd pair of correlation optoelectronic switch 12 and a V font handgrip 11 are formed; V font handgrip 11 is fixed on the cylinder 13 telescopic shaft ends that are used to reject, the 3rd pair of correlation optoelectronic switch 12 lies against travelling belt 2 both sides, the position of the 3rd pair of correlation optoelectronic switch 12 is in the position of the cylinder 13 that is used to reject along the about 10cm in direction rear end of travelling belt transmission, make when the brake block that sends blocks the light path of the 3rd pair of correlation optoelectronic switch 12 just, the elongation of the extension arm of the cylinder 13 that is used to reject can be pushed brake block 1 open, acoustic pickup 18 is placed on the top of knocking device, is connected with computing machine 20 by the sound collection card 19 of lead-in wire outside soundproof box 14.
As shown in Figure 2, described supporting plate 16 has a plurality of threaded holes along the both sides that travelling belt 2 moves, and support stick 15 can match with a plurality of threaded holes respectively, holds up the brake block 1 of different size.
As shown in Figure 2, on the brake block rest device by support stick 15, supporting plate 16, brake block pop-up cylinder 17 is formed, four support sticks 15 erectting on the supporting plate 16 rise to brake block 1 picking-up steadily and knock the position that hand hammer 8 can knock.Four support sticks 15 are to couple together by the screw thread of an end and the screw on the supporting plate 16, diverse location on supporting plate 16 has the threaded hole of identical size, can conveniently adjust the position of support stick, can hold up the brake block of different size like this and guarantee that brake block can be stabilized picking-up.When work, after had adjusted support stick 15 positions, change was not allowed in its position before brake block 1 model change to be checked.Support stick 15 support ends adopt rubber or felt materials, because need friction disc is unsettled when knocking, if the support stick metal material directly contacts with the brake block rigidity, the sound that knocks will be sneaked into the frequency response of support stick and supporting plate, not only can increase the stiction that picks out but also can reduce the noise composition that reacts the brake block frequency response with felt or rubber material.
As shown in Figure 3, described knocking device comprises and knocks the short U-shaped elastic arm 6 of hand hammer 8, armature 7 and a length of side on one side, knock hand hammer 8 and be installed in U-shaped elastic arm 6 long limit medial surfaces, armature 7 is installed in the arc end medial surface of U-shaped elastic arm 6, and U-shaped elastic arm 6 minor faces are fixed on the slide block 5.
Entire work process of the present utility model is:
As shown in Figure 1, brake block 1 lies in above the travelling belt 2, being sent to soundproof box 14 by travelling belt 2 and carrying out the sound typing. soundproof box 14 adopts sandwich construction, acoustical cotton is inserted in the inside, guarantee to sneak into less in the soundproof box noise as far as possible. soundproof box 14 side evolution mouths, make travelling belt 2 and brake block 1 therefrom to pass through. transmit the light path that enters soundproof box 14 and sheltered from first pair of correlation optoelectronic switch 9 just when brake block 1, this moment system learn brake block 1 be sent to striking mechanism under, 17 elongations of brake block pop-up cylinder, the support stick of erectting on the supporting plate 16 15 supports brake block 1, up to being held the fixing positions that hand hammer 8 strikes of knocking by U-shaped elastic arm 6 length after armature 7 absorption, at this moment blocked the light path of second pair of correlation optoelectronic switch 10 just, after system obtains the chopping signal of second pair of correlation optoelectronic switch 10, beginning is carried out power on/off to the armature of 6 knocking devices successively, realize six and knock the process that hand hammer 8 knocks successively. simultaneously, acoustic pickup 18 collects this six voice signals respectively, and by sound collection card 19 voice signal is converted to digital signal and is sent to computing machine 20. computing machines prior knock tone signal of typing specification product same position before work. in the course of the work, computing machine 20 is handled the knocking of the brake block of gathering to be measured, extract the waveform character value, calling the waveform character that knocks of the up-to-standard brake block of the same model that is stored in advance in the computing machine then compares, judge according to certain threshold range whether brake block to be checked is qualified, and store results. knock adopt sound and finish after, 17 backhauls of brake block pop-up cylinder, brake block 1 is put back on the travelling belt 2, travelling belt 2 continues operation, when running to the light path that covers the 3rd pair of correlation optoelectronic switch 12 just, travelling belt 2 determines whether stopping to continue operation according to the judged result of computing machine. if this quality of brake pad of computer-made decision is defective, then travelling belt 2 is out of service, the cylinder 13 that is used to simultaneously reject extends, the V font handgrip of cylinder arm front portion is released travelling belt 2 with brake block 1, afterwards, cylinder 13 backhauls that are used to reject, travelling belt 2 continues operation; If judge that brake block 1 is certified products, then travelling belt 2 does not stop, and brake block 1 is transported in the finished product case of back.
Claims (3)
1. automatic detection device for quality of brake pad, it is characterized in that: steel shelf (3) is set in soundproof box (14), steel shelf (3) is placed in travelling belt (2) top, travelling belt (2) width is less than the width of brake block (1), guide rail (4) is fixed on the both sides of steel shelf (3) along travelling belt (2) direction, on two guide rails (4) respectively symmetric arrangement three knocking devices are arranged, each knocking device can move freely and fix in slide block (5), the receiving end of first pair of correlation optoelectronic switch (9) is separately fixed at travelling belt (2) both sides with transmitting terminal, make be transported to that the brake block (1) that knocks hand hammer (8) below in the knocking device can block that correlation optoelectronic switch (9) transmitting terminal sends light, supporting plate (16) horizontal positioned also is fixed on the telescopic shaft of brake block pop-up cylinder (17), brake block pop-up cylinder (17) and supporting plate (16) are placed on travelling belt (2) below, supporting plate (16) is installed support stick (15) respectively along the both sides of travelling belt (2) motion, and the support stick of both sides (15) width is greater than the width of travelling belt (2), second pair of correlation optoelectronic switch (10) place first pair of correlation optoelectronic switch (9) directly over, the feasible light that when brake block (1) is held in the palm beating position, can block second pair of correlation optoelectronic switch (10) just, brake block screening module is by a cylinder that is used to reject (13), the 3rd a pair of correlation optoelectronic switch (12) and a V font handgrip (11) are formed; V font handgrip (11) is fixed on cylinder (13) the telescopic shaft end that is used to reject, the 3rd pair of correlation optoelectronic switch (12) lies against travelling belt (2) both sides, the direction back-end location that transmit along travelling belt at the cylinder that is used to reject (13) position of the 3rd pair of correlation optoelectronic switch (12), make when the brake block that sends blocks the light path of the 3rd pair of correlation optoelectronic switch (12) just, the elongation of the extension arm of the cylinder that is used to reject (13) can be pushed brake block (1) open, acoustic pickup (18) is placed on the top of knocking device, is connected with computing machine (20) by the sound collection card (19) of lead-in wire outside soundproof box (14).
2. a kind of automatic detection device for quality of brake pad according to claim 1, it is characterized in that: described supporting plate (16) has a plurality of threaded holes along the both sides of travelling belt (2) motion, support stick (15) can match with a plurality of threaded holes respectively, holds up the brake block (1) of different size.
3. a kind of automatic detection device for quality of brake pad according to claim 1, it is characterized in that: described knocking device comprises and knocks the short U-shaped elastic arm (6) of hand hammer (8), armature (7) and a length of side on one side, knock hand hammer (8) and be installed in the long limit of U-shaped elastic arm (6) medial surface, armature (7) is installed in the arc end medial surface of U-shaped elastic arm (6), and U-shaped elastic arm (6) minor face is fixed on the slide block (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201244366U CN201464425U (en) | 2009-07-10 | 2009-07-10 | Device for automatically detecting quality of brake pads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201244366U CN201464425U (en) | 2009-07-10 | 2009-07-10 | Device for automatically detecting quality of brake pads |
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| CN201464425U true CN201464425U (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201244366U Expired - Fee Related CN201464425U (en) | 2009-07-10 | 2009-07-10 | Device for automatically detecting quality of brake pads |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419347A (en) * | 2011-08-17 | 2012-04-18 | 江苏安捷汽车配件有限公司 | Brake pad quality detection control device, and use method and application thereof |
| CN102998364A (en) * | 2012-11-20 | 2013-03-27 | 雅安恒圣高纯石墨科技有限责任公司 | Audio spectrum detection system and method for internal crack of graphite product |
| CN109856237A (en) * | 2019-03-13 | 2019-06-07 | 东北林业大学 | A kind of ultrasonic wave online automatic detection equipment of railway bearing Internal and external cycle |
| CN114354759A (en) * | 2022-01-21 | 2022-04-15 | 浙江三鼠智能科技有限公司 | Intelligent building audio and video equipment detection device |
-
2009
- 2009-07-10 CN CN2009201244366U patent/CN201464425U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419347A (en) * | 2011-08-17 | 2012-04-18 | 江苏安捷汽车配件有限公司 | Brake pad quality detection control device, and use method and application thereof |
| CN102998364A (en) * | 2012-11-20 | 2013-03-27 | 雅安恒圣高纯石墨科技有限责任公司 | Audio spectrum detection system and method for internal crack of graphite product |
| CN109856237A (en) * | 2019-03-13 | 2019-06-07 | 东北林业大学 | A kind of ultrasonic wave online automatic detection equipment of railway bearing Internal and external cycle |
| CN114354759A (en) * | 2022-01-21 | 2022-04-15 | 浙江三鼠智能科技有限公司 | Intelligent building audio and video equipment detection device |
| CN114354759B (en) * | 2022-01-21 | 2023-11-21 | 浙江三鼠智能科技有限公司 | Intelligent building audio and video equipment detection device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20100710 |