CN103698409B - Drum-type probe device for ultrasonic testing applied to steel plate - Google Patents
Drum-type probe device for ultrasonic testing applied to steel plate Download PDFInfo
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- CN103698409B CN103698409B CN201310750784.5A CN201310750784A CN103698409B CN 103698409 B CN103698409 B CN 103698409B CN 201310750784 A CN201310750784 A CN 201310750784A CN 103698409 B CN103698409 B CN 103698409B
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Abstract
A drum-type probe device for ultrasonic testing is characterized by comprising a middle shaft, probes, internal flanges, external flanges and an outer film, wherein the middle shaft is hollow to allow a cable to pass through, two ends are sealed, a through hole is formed in the outer wall on one side, and a mounting base is arranged on the through hole; the probes are arranged on the mounting base in a sealed manner and exposed out of an emission end surface; the two internal flanges are arranged at two ends of the middle shaft respectively; the two external flanges are arranged at two ends of the middle shaft respectively and located outside the internal flanges; and the outer film is made of a flexible and acoustically-transparent material, located outside the middle shaft and wraps the probes, and two ends of the outer film are connected between the outer end surfaces of the internal flanges and the inner end surfaces of the external flanges in a sealing manner. Compared with the prior art, the drum-type probe device for ultrasonic testing has the advantages that due to additional arrangement of the outer film, in a detection process, the outer film is contacted with a steel plate surface while the probes are not contacted with the steel plate surface, so that abrasion of the probes is reduced, and the service life of the probes is guaranteed.
Description
Technical field
The present invention relates to a kind of steel plate damage detection apparatus, more particularly, to a kind of ultrasonic detection device.
Background technology
At present, steel-plate ultrasound ripple detection is generally initially directly detected to steel plate by operator's hand hold transducer of bending over, this
Mode is relatively simple, there are a lot of deficiencies.Because steel plate area is big, quantity is many, and probe abrasion is excessive, and for a long time
Detection of bending over or squat down easily causes operator's fatigue, high labor intensive, and detection speed is slower；This kind of detection means can
Chinese utility model patent with referenced patent number as ZL200720199686.7《A kind of ultrasonic flaw detecting device》(authorize
Notification number is CN201141855Y), can Chinese utility model with referenced patent number as ZL200920254007.0 special
Profit《Handheld steel sheet detector》(Authorization Notice No. is CN201503418U) etc..
For this reason, researcher develops a lot of inspection cars to carrying out steel plate detection, it passes through multiple ultrasonic probes side by side,
The chip contact good with the holding of detected surface of steel plate of popping one's head in is ensured using water coincidence mode.Improve detection speed, fall
Low labour intensity.MCC Jingtang Construction Co., Ltd., Machine Design research institute of Jining City, Jilin Province sky close wind power equipment
Co., Ltd and Deng Duojia enterprises and institutions of Xinjiang Bayi Iron ＆ Steel Co., Ltd. of Baosteel Group Corporation all have developed similar products, specifically
Refer to the Chinese utility model patent of Patent No. ZL 201020588791.1《Ultrasonic flaw detection device for steel plate》(authorize public
Announcement number:CN201844998U)；Can Chinese utility model patent with referenced patent number as ZL201020156915.9《?
Wire type multi-channel ultrasonic wave medium plate detection device》(Authorization Notice No. is CN201653988U)；Patent No.
The Chinese utility model patent of ZL201120154373.6《Eight channel ultrasonic steel plate inspection cars》(Authorization Notice No. is
CN202101975U)；The Chinese utility model patent of Patent No. ZL201220309975.9《Steel-plate ultrasound ripple is automatic
Testing equipment》(Authorization Notice No.:CN202693526U) etc..But all adopt contact probe on this kind of inspection car,
Skiing type is made to pop one's head in, the acoustic beam angle of this probe is unadjustable.When probe car assembles, by ultrasonic probe
Fix down, vertical detection face.Detection process is contacted with surface of steel plate, in order to ensure that ultrasonic wave can smoothly enter
Steel plate, needs probe is pressed on steel plate so that fitting closely, when surface of steel plate is more coarse, in detection process
Constantly friction can lead to heavy wear of popping one's head in.With detecting head surface serious wear, it will produce with the contact surface of surface of steel plate
Change shape, leads to internal ultrasonic wave sound bundle direction change, reduces detection sensitivity, more serious generation missing inspection or mistake
Inspection.Shorten the service life of probe, increased testing cost.
Content of the invention
The technical problem to be solved is to provide one kind to fit tightly with surface of steel plate for the above-mentioned state of the art
Close and pop one's head in nonabradable ultrasound examination drum-type probe apparatus.
The present invention solves the technical scheme that adopted of above-mentioned technical problem：A kind of ultrasound examination drum-type probe apparatus,
It is characterized in that including
Axis, hollow supplies cable to pass through and two ends sealing setting, and side outer wall offers through hole, this through hole is provided with peace
Dress seat；
Probe, is sealingly arranged in aforesaid mounting seat and exposes emitting facet；
Inner flange, is two, is respectively arranged on aforementioned axis two ends；
Outward flange, is two, is respectively arranged on aforementioned axis two ends and is located at outside inner flange；And
Adventitia, for flexible entrant sound material, wraps up, before two ends are sealedly attached to outside aforementioned axis and by aforementioned probe
State between inner flange outer face and outward flange inner face.
The mounting means of probe is preferably as follows structure：The close axis of described mounting seat inwall has annular groove, this annular
It is provided with sealing ring, the side of described mounting seat offers location hole near outer end, it is fixed that a securing member is arranged in this in groove
Position in the hole and probe is positioned and is fixed with a location nut.
Further, this device also includes motor and the decelerator with motor connection, the clutch end of this decelerator and axis
Connect, for hollow and two ends are equipped with axle envelope and axle sleeve to described outward flange from the outside to the core, and aforementioned axle envelope outer wall is covered with gland,
It is provided with the deep groove ball bearing with central axis cooperation in aforementioned axle sleeve.
Further, it is provided with the first circlip and Ge Lai circle, described axle sleeve outer wall between described sleeve lining and axis outer wall
It is provided with the second back-up ring and O-ring and outward flange inwall between.
Further, run through and offer first through hole on side outward flange and inner flange, run through opposite side outward flange and inner flange
Offer the second through hole and third through-hole, in aforesaid first through hole, be provided with water inlet component, set in aforesaid second through hole
It is equipped with gas deflation assembly, in aforesaid third through-hole, be provided with drain assembly.
Further, for enabling probe to be adjusted accordingly, car body and platform are also included, this car body at least includes base plate, aforementioned
Platform be located above base plate and can be arranged at up and down on aforesaid base plate, described axis, adventitia and outward flange are located at
Below base plate, described outward flange outer end is provided with connector, and two connecting screw rods are disposed through base plate two ends, upper end with
Platform connects, and lower end is flexibly connected with former connector.
The top of described connecting screw rod is stretched out platform and is disposed with adjusting nut, positioning briquetting and locking screw from the outside to the core
Mother, the bottom of described connecting screw rod has bulb, and accordingly, the upper end of described connector has and the activity of aforementioned bulb
The ball groove of cooperation.Probe left and right directions can be finely tuned.
Further, described platform periphery offers multiple first perforation, and accordingly, described base plate offers multiple the
Two perforation, are provided with linear bearing in each second perforation, and multiple guide spiro rods extend through bores a hole and straight in aforesaid first
In bobbin holds, top fixing nut is fixed, and bottom is provided with buffer spring.
For enabling probe to lift, described car body also includes a handle located at base plate side, the junction of this handle and base plate
It is provided with a directive wheel；This device also includes slide block, extension spring and hauling rope, and aforesaid slide block can be movably on base plate；
Aforesaid extension spring one end is connected with the fixed column on base plate, and the other end is connected with the side of slide block, and aforementioned hauling rope one end sets
Put with handle on, the other end is bypassed directive wheel and is connected with the opposite side of slide block；The side of described platform has a roller,
This roller can rollably arrange with the inclined plane of slide block on.
Compared with prior art, it is an advantage of the current invention that：Due to setting up of adventitia, in detection process, adventitia and steel
Plate surface contacts, and pops one's head in and be not directly contacted with surface of steel plate, reduces to the abrasion popped one's head in the use it is ensured that popping one's head in
Life-span.
Brief description
Fig. 1 is example structure schematic diagram.
Fig. 2 is example structure sectional view.
Fig. 3 is magnified partial view in Fig. 2.
Fig. 4 is the structure sectional view at embodiment Fig. 2 partly another visual angle.
Specific embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As depicted in figs. 1 and 2, the ultrasound examination drum-type probe apparatus in the present embodiment include axis 1, probe 12,
Inner flange 1a, outward flange 1b, adventitia 10, motor, decelerator 37, car body, platform 5, slide block 67, extension spring 64
And hauling rope 63.
In conjunction with shown in Fig. 3 and Fig. 4, axis 1 hollow supplies cable to pass through and two ends sealing setting, and side outer wall offers four
Individual through hole, this through hole is provided with mounting seat 11；The close axis of mounting seat 11 inwall has annular groove, this annular
It is provided with sealing ring 14, probe 12 is four, and each probe 12 is sealingly arranged in mounting seat 11 and reveals in groove
Go out emitting facet；Specifically, the side of mounting seat 11 offers location hole near outer end, and it is fixed that securing member 13 is arranged in this
Position in the hole and fixed probe 12 positioning and with location nut.
Inner flange 1a is two, is respectively arranged on axis 1 two ends；Outward flange 1b is also two, is respectively arranged on axis 1
Two ends are simultaneously located at outside inner flange 1a；For hollow and two ends are equipped with axle envelope and axle sleeve 3, axle to outward flange 1b from the outside to the core
Envelope outer wall is covered with gland 36, is provided with the deep groove ball bearing 34 with central axis cooperation in axle sleeve 3.Axle sleeve 3 inwall and
It is provided with the first circlip 31 and Ge Lai circle 39 between axis 1 outer wall, set between axle sleeve 3 outer wall and outward flange 1b inwall
There are the second circlip 32 and O-ring 38.
Sealing ring 7 is arranged between axis 1 and outward flange 1b, for keeping off oil, prevents the skidding ester in bearing to run off and is subject to
Tide, and as prevention sliding ring abrasion back roll inner couplings media leaks.First circlip 31 ensures axis 1
There is not axially-movable with axle sleeve 3.O-ring 38 is used for waterproof.Lattice come to enclose 39 for sealing with prevent inner couplings Jie
Matter exosmoses.Second circlip 32 ensures that outward flange 1b and axle sleeve 3 do not occur axially-movable.
Adventitia 10 is flexible entrant sound material, and positioned at axis 1 outside and will pop one's head in and 12 wrap up, two ends are sealedly attached to interior method
Between blue 1a outer face and outward flange 1b inner face.By outward flange 1b and inner flange 1a and flexible tubular adventitia 10
Edge clamping, formation is tightly connected, to form probe 12 interior sealing spaces between outward flange 1b and inner flange 1a,
Pop one's head in the hydraulically full couplant in 12 interior sealing spaces.Outward flange 1b and inner flange 1a is carried out even using screw bolt and nut
Connect.
Decelerator 37 is connected with motor (in figure no shows), and the clutch end of this decelerator 37 is connected with axis 1.This reality
Apply the preferred turbine and worm structure of decelerator 37 in example.Motor adopts micromachine, for controlling probe 12 around axis
1 circuit oscillation, is moved by electric switch controlled motor, drives the change-speed gearing in decelerator 37 that rotating speed is down to low
Speed is run, and drives axis 1 to rotate, reaches inner probe 12 circuit oscillation.
As shown in figure 1, car body includes base plate 61 and handle 62, handle 62 located at base plate 61 side, handle 62 with
The junction of base plate 61 is provided with directive wheel 65；Slide block 67 can be movably on base plate 61；Extension spring 64 one end and base plate
Fixed column 66 (or fixing bolt) on 61 connects, and the other end is connected with the side of slide block 67, and hauling rope 63 one end is arranged
On handle 62, the other end is bypassed directive wheel 65 and is connected with the opposite side of slide block 67；The side of platform 5 has one
Roller 68, this roller 68 can rollably arrange with the inclined plane of slide block 67 on.
Offer first through hole in conjunction with, shown in Fig. 4, running through on side outward flange 1b and inner flange 1a, run through outside opposite side
Flange 1b and inner flange 1a offers the second through hole and third through-hole, is provided with water inlet component in first through hole, and second leads to
In the hole is provided with gas deflation assembly, is provided with drain assembly in third through-hole.Drain assembly does not mutually connect with water inlet component.Enter
Water assembly includes water inlet pipe 41, water inlet pipe nut 42 and silicone tube 43, and water inlet pipe 41 and first through hole carry out sealing even
Connect, water inlet pipe nut 42 controls the switch of water inlet pipe 41, and silicone tube 43 is enclosed within water inlet pipe 41, by water inlet pipe 41
Internal to probe 12 can inject water.Gas deflation assembly and drain assembly are arranged on outward flange 1b with axisymmetric position, row
Pneumatic module includes L-type blast pipe 44, polytetrafluoroethylene (PTFE) pad 441 and blast pipe nut 45, and drain assembly includes L-type row
Water pipe 46, polytetrafluoroethylene (PTFE) pad 461 and drainpipe nut 47.
When needing to carry out water filling inside to probe 12, tighten drainpipe nut first and close drain assembly, then turn on
Drainpipe nut opens gas deflation assembly, then opens water inlet pipe 41, external water source is accessed inside probe 12, works as probe
After filling water inside 12, close water inlet pipe 41 and gas deflation assembly；When discharging water, it is first turned on water inlet pipe 41 or exhaust
Assembly, then opens drain assembly, so that water is voluntarily flowed out.
In conjunction with shown in Fig. 2, platform 5 is located at base plate 61 top and can be arranged at up and down on base plate 61, axis 1, outward
Film 10 and outward flange 1b are located at below base plate 61, and platform 5 is rectangular table face, act as adjusting probe 12
Sound beam direction and whole height.Outward flange 1b outer end is provided with connector 35, and two connecting screw rods 54 are disposed through base plate
61 two ends, upper end is connected with platform 5, and lower end is flexibly connected with connector 35.Platform is stretched out on the top of connecting screw rod 54
5 and be disposed with adjusting nut 51, positioning briquetting 52 and locking nut 53, the bottom of connecting screw rod 54 from the outside to the core
There is bulb 55, accordingly, the upper end of connector 35 has the ball groove with bulb 55 activity cooperation.Platform 5 periphery
Offer multiple first perforation, accordingly, base plate 61 offers multiple second perforation, is provided with straight in each second perforation
Bobbin holds 57, and multiple guide spiro rods 56 extend through in the first perforation and linear bearing 57, and top is solid with fixing nut
Fixed, bottom is provided with buffer spring 58 by bolt 59.Guide spiro rod 56 in the present embodiment is 4.By adjusting
The adjusting nut 51 of connecting screw rod 54 upper end is realized connecting screw rod 54 and is lifted, thus driving on probe 12 left and right directions
Micro- swing.
In conjunction with shown in Fig. 1, operating personnel's control handle 62 applies pulling force to hauling rope 63, is drawn by hauling rope 63
Slide block moves in the guide rail on base plate 61, and extension spring 64 is stretched, using slide block inclined plane upwards, roller 68
Lifting in inclined plane, so makes platform 5 and probe 12 liftings simultaneously so that probe 12 lift-off ground, it is to avoid non-
When detection state or inspection car turn to, external membrane 10 causes unnecessary abrasion；After operating personnel's release handle 62, draw
Spring 64 shrinks, and produces pulling force to slide block so as to return in situ, roller 68 declines in inclined plane, platform 5 and popping one's head in
12 also decline simultaneously, return to operating position.
Probe 12 in the present embodiment adopts ultrasonic wave water logging normal probe, and each probe 12 can independently mounted be dismantled,
If one of damage, the probe 12 of this damage only need to be changed.The ultrasound beamformer of probe 12 transmitting is through coupling
Close medium (water), penetrate adventitia 10 enter steel plate inside, when ultrasonic wave runs into defect in steel plate internal communication, part or
The whole sound wave of person can be reflected back, and is popped one's head in 12 receptions further through adventitia 10 and couplant.Shifting with inspection car
Dynamic, probe 12, in surface of steel plate progressive rolling movement, can achieve the uninterrupted detection to steel plate.
Due to setting up of adventitia, in detection process, adventitia is contacted with surface of steel plate, and it is not straight with surface of steel plate to pop one's head in
Contact, reduces to the abrasion popped one's head in the service life it is ensured that popping one's head in.In addition, multiple probes are installed concentratedly
In one axis, a width of 400mm of scanning area, detects steel plate thickness scope 13～100mm, has ultrasonic acoustic
Bundle regulatory function, it may be achieved the overall rising height of ultrasound wave barrel formula probe>5cm, realizes the water logging within drum-type probe
About normal probe group and circuit oscillation, amplitude of fluctuation>± 2 degree；Can achieve that easily ultrasonic wave acoustic beam direction is adjusted, carry
The high adaptability of drum-type probe, is greatly enhanced detection speed, reduces labour intensity, can meet the Supreme People's Procuratorate and test the speed
The application demand of degree steel plate inspection car.
Claims (4)
1. a kind of ultrasound examination drum-type probe apparatus being applied to steel plate are it is characterised in that include
Axis, hollow supplies cable to pass through and two ends sealing setting, and side outer wall offers through hole, this through hole is provided with mounting seat；
Probe, is sealingly arranged in aforesaid mounting seat and exposes emitting facet；
Inner flange, is two, is respectively arranged on aforementioned axis two ends；
Outward flange, is two, is respectively arranged on aforementioned axis two ends and is located at outside inner flange；And
Adventitia, for flexible entrant sound material, outside aforementioned axis and by aforementioned probe parcel, two ends are sealedly attached between aforementioned inner flange outer face and outward flange inner face；
This device also includes motor and the decelerator with motor connection, the clutch end of this decelerator is connected with axis, for hollow and two ends are equipped with axle envelope and axle sleeve to described outward flange from the outside to the core, and aforementioned axle envelope outer wall is covered with gland, are provided with the deep groove ball bearing with central axis cooperation in aforementioned axle sleeve；
Also include car body and platform, this car body at least includes base plate, aforesaid platform is located above base plate and can be arranged at up and down on aforesaid base plate, described axis, adventitia and outward flange are located at below base plate, described outward flange outer end is provided with connector, two connecting screw rods are disposed through base plate two ends, and upper end is connected with platform, and lower end is flexibly connected with former connector；
The top of described connecting screw rod is stretched out platform and is disposed with adjusting nut, positioning briquetting and locking nut from the outside to the core, and the bottom of described connecting screw rod has bulb, and accordingly, the upper end of described connector has the ball groove with the activity cooperation of aforementioned bulb；
Described platform periphery offers multiple first perforation, accordingly, described base plate offers multiple second perforation, it is provided with linear bearing in each second perforation, multiple guide spiro rods extend through in the aforesaid first perforation and linear bearing, top fixing nut is fixed, and bottom is provided with buffer spring；
Described car body also includes a handle located at base plate side, and this handle is provided with a directive wheel with the junction of base plate；This device also includes slide block, extension spring and hauling rope, and aforesaid slide block can be movably on base plate；Aforesaid extension spring one end is connected with the fixed column on base plate, and the other end is connected with the side of slide block, and in the setting of aforementioned hauling rope one end and handle, the other end is bypassed directive wheel and is connected with the opposite side of slide block；The side of described platform has a roller, and this roller can rollably be arranged in the inclined plane of slide block.
2. the ultrasound examination drum-type probe apparatus being applied to steel plate according to claim 1, it is characterized in that the inwall of described mounting seat has annular groove, this annular groove is arranged near axis, it is provided with sealing ring in this annular groove, the side of described mounting seat offers location hole near outer end, and a securing member is arranged in this positioning in the hole and positions probe and fixed with a location nut.
3. the ultrasound examination drum-type probe apparatus being applied to steel plate according to claim 1, it is characterized in that being provided with the first circlip and Ge Lai circle between described sleeve lining and axis outer wall, between described axle sleeve outer wall and outward flange inwall, it is provided with the second back-up ring and O-ring.
4. the ultrasound examination drum-type probe apparatus being applied to steel plate according to claim 1, it is characterized in that run through offering first through hole on side outward flange and inner flange, run through opposite side outward flange and inner flange offers the second through hole and third through-hole, it is provided with water inlet component in aforesaid first through hole, it is provided with gas deflation assembly in aforesaid second through hole, in aforesaid third through-hole, be provided with drain assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310750784.5A CN103698409B (en) | 2013-12-30 | 2013-12-30 | Drum-type probe device for ultrasonic testing applied to steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310750784.5A CN103698409B (en) | 2013-12-30 | 2013-12-30 | Drum-type probe device for ultrasonic testing applied to steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103698409A CN103698409A (en) | 2014-04-02 |
| CN103698409B true CN103698409B (en) | 2017-02-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310750784.5A Expired - Fee Related CN103698409B (en) | 2013-12-30 | 2013-12-30 | Drum-type probe device for ultrasonic testing applied to steel plate |
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| Country | Link |
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| CN (1) | CN103698409B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730142B (en) * | 2014-11-20 | 2017-11-17 | 北京航空航天大学 | A kind of flat magnetic field scanning imaging system based on Hall sensor |
| CN106645426A (en) * | 2016-11-25 | 2017-05-10 | 上海交通大学 | Limiting and constant pressure-maintaining device for optical fiber type attenuated total reflection probe |
| CN107037134B (en) * | 2017-04-25 | 2024-02-13 | 中国科学院声学研究所 | Submersible ultrasonic probe alignment structure and adjustment method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1141046A (en) * | 1965-05-21 | 1969-01-22 | Automation Ind Inc | Ultrasonic testing |
| CN1286401A (en) * | 1999-08-25 | 2001-03-07 | 攀枝花钢铁（集团）公司钢铁研究院 | Ultrasonic inspection method and device for rail |
| CN2615666Y (en) * | 2003-03-14 | 2004-05-12 | 中国科学院声学研究所 | Phased array probe for solid material ultrasound nondestructive testing |
| CN102565196A (en) * | 2011-12-10 | 2012-07-11 | 无锡莱林检测机械有限公司 | Ultrasonic flaw-detecting machine for steel pipes |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004020335A (en) * | 2002-06-14 | 2004-01-22 | Osaka Gas Co Ltd | Ultrasonic flaw detecting apparatus |
| JP2006053040A (en) * | 2004-08-11 | 2006-02-23 | Kobe Steel Ltd | Cast piece freezing layer thickness measuring device of continuous casting machine |
| JP4555837B2 (en) * | 2007-01-11 | 2010-10-06 | 新日本製鐵株式会社 | Steel pipe or steel pipe pile gripping device |
-
2013
- 2013-12-30 CN CN201310750784.5A patent/CN103698409B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1141046A (en) * | 1965-05-21 | 1969-01-22 | Automation Ind Inc | Ultrasonic testing |
| CN1286401A (en) * | 1999-08-25 | 2001-03-07 | 攀枝花钢铁（集团）公司钢铁研究院 | Ultrasonic inspection method and device for rail |
| CN2615666Y (en) * | 2003-03-14 | 2004-05-12 | 中国科学院声学研究所 | Phased array probe for solid material ultrasound nondestructive testing |
| CN102565196A (en) * | 2011-12-10 | 2012-07-11 | 无锡莱林检测机械有限公司 | Ultrasonic flaw-detecting machine for steel pipes |
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Effective date of registration: 20160812 Address after: 315103 Zhejiang city of Ningbo province high tech Zone Lingyun Road No. 199 Applicant after: CHINA WEAPON SCIENCE ACADEMY NINGBO BRANCH Applicant after: NO.52 INSTITUTE OF CHINA NORTH INDUSTRIES Group Corp. Address before: 315103 Ningbo science and Technology Park, Zhejiang Lingyun Road, No. 199 Applicant before: NO.52 Institute of China North Industries Group Corp. |
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