CN105817997B - A kind of curved surfaces ozzle polishing survey tool and its application method - Google Patents
A kind of curved surfaces ozzle polishing survey tool and its application method Download PDFInfo
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- CN105817997B CN105817997B CN201610182179.6A CN201610182179A CN105817997B CN 105817997 B CN105817997 B CN 105817997B CN 201610182179 A CN201610182179 A CN 201610182179A CN 105817997 B CN105817997 B CN 105817997B
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- polishing
- measurement
- gage frame
- ozzle
- cylinder
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention provides a kind of curved surfaces ozzle polishing survey tool, gage frame including rectangular configuration, the positioner of two diagonal end points of rectangular configuration, gage frame longitudinal rod both sides locking device, fixation and buffer unit, be arranged in montant in gage frame, end points has bearing pin, surface layout has cross bar, measuring set of cylinder and the measuring instrument of centring hole, in positioning and measurement, the cylinder of measuring set of cylinder is vertically disposed in centring hole, by in the rectangular channel of the measurement bar insertion measuring set of cylinder in measuring instrument, measuring instrument is set to be contacted with nozzle surface.Present invention also offers the application method of above-mentioned curved surfaces ozzle polishing survey tool.Device provided by the invention overcomes the deficiencies in the prior art, can control measurement error in 0.02mm, meet the requirement by the precision controlling of polishing amount within 0.1mm when measurement object is installed at the scene, and simple in construction, manufactures and easy to use.
Description
Technical field
The present invention relates to a kind of curved surfaces ozzle polishing survey tool, more particularly to one kind to be applied to two generations, San Daihe
Polishing survey tool when power station is installed similar to the equipment of in-pile component.
Background technology
In nuclear power plant's hot operation, in-pile component and pressure vessel may generating material deformations.After meeting to deform
Ozzle gap still meets the requirement such as Seismic analysis of NPPs, flow, it is desirable in room temperature, it is necessary to ensure that two heat of in-pile component
Certain interval be present between two hot arc ozzles of section ozzle and pressure vessel, the gap must be controlled in about 4.3 ± 0.12mm.
Because of factors such as manufacturing process, measurement errors, the hot arc ozzle of in-pile component and pressure vessel can not in the fabrication stage
The precision of design requirement is fully achieved.Need after at the construction field (site) coordinating in-pile component and pressure vessel, beaten according to measured value
The nozzle surface of in-pile component is ground, to reach design requirement.When equipment is dispatched from the factory, design side is with laser tracker to structure in heap
Part ozzle measures, and provides polishing amount and polishing position by measurement, however, the survey of this survey tool of laser tracker
Measure error about 0.1mm, it is impossible to meet 0.1mm polishing required precision.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of arc that can be by the precision controlling of polishing amount within 0.1mm
Surface ozzle polishing survey tool.
In order to solve the above-mentioned technical problem, the technical scheme is that providing a kind of curved surfaces ozzle polishing measurement work
Tool, it is characterised in that including：
Gage frame, the gage frame is the rectangular configuration being made up of longitudinal rod and transverse bar, and transverse bar edge is horizontal
Direction sets radian, to be bonded the curved surfaces of measurement object；
Positioner, positioned at any two diagonal end points of rectangular configuration of gage frame；
Locking device, positioned at gage frame longitudinal rod both sides, for gage frame to be fastened on into measurement object；
Fixed and buffer unit, positioned at gage frame longitudinal rod and transverse bar center position, for aiding in fixation measuring frame
Frame, and cushioning effect is played to ozzle；
The montant that surface layout has axis hole, is parallel to each other, by the support perpendicular to measurement object, it is arranged in gage frame
On, and it is parallel with the longitudinal rod of gage frame；
End points has the cross bar that bearing pin, surface layout have centring hole, and edge is fixed on montant perpendicular to the direction of montant；
Measuring set of cylinder, including chassis and the cylinder on chassis, cylinder center are disposed with rectangular channel；
Measuring instrument, including measurement bar and the tapered end positioned at measurement bar one end；
In positioning and measurement, the cylinder of measuring set of cylinder is vertical in the centring hole of cross bar, the measurement bar of measuring instrument
Insert in the rectangular channel of measuring set of cylinder, measuring instrument is contacted with nozzle surface.
Preferably, the gage frame is stainless steel.
Preferably, the montant is two.
Preferably, the positioner is positioning pore structure.
Preferably, the compression device is included in the tight lock that gage frame longitudinal rod both sides same level direction is distributed respectively
Circle, binding strap is each passed through the deflation circle in same level direction, around measurement object one enclose or multi-turn after lock.
Preferably, the fixation and buffer unit include the compression located at gage frame longitudinal rod and transverse bar center position
Bolt, and the buffering spacer positioned at hold-down bolt end, hold-down bolt are correspondingly screwed in clamp sleeve, and buffering spacer is close to
In nozzle surface.
Preferably, the end of the cross bar is disposed with magnetic devices.
Preferably, screw-in bolt is respectively distributed with the gage frame longitudinal rod both sides same level direction, screws in bolt edge
Screw in, be close to measurement object surface perpendicular to measurement object direction.
Preferably, it is lined with rubber blanket on the contact surface of the binding strap, buffering spacer, screw-in bolt and measurement object.
Present invention also offers the application method of above-mentioned curved surfaces ozzle polishing survey tool, it is characterised in that step
For：
Step 1, survey tool is fixed in measurement object；
Step 2, the cylinder of measuring set of cylinder is vertically disposed in the centring hole of cross bar, the measurement bar in measuring instrument is inserted
In the rectangular channel for entering measuring set of cylinder, the taper end points of measuring instrument is contacted with measurement object surface, and surveyed using measuring instrument
Amount is located at the positioner of two diagonal end points of gage frame to the vertical range on measurement object surface, records numerical value, measuring instrument
Marked with the contact point on measurement object surface；
If step 3, basis are in the pre-determined dry rubbing control point of nozzle surface, position of the mobile cross bar in gage frame
Put, using step 2 method measurement cross bar on centring hole to polish control point Q1~Qn vertical range, and record numerical value R1~
Rn；
Step 4, polishing control point is polished, after the completion of polishing, repeat step 2, positioner, positioner arrived
The vertical range on measurement object surface is confirmed；
If the tapered end and measurement object surface contact point in step 5, measuring instrument are not marks, adjustment measurement
Framework makes measuring instrument be overlapped with the contact point on measurement object surface with mark；Measurement and positioning device to mark distance whether with
The numerical value of record is identical before polishing, if the tapered end in measuring instrument and measurement object surface contact point are not marks, adjustment
The distance that gage frame marks the contact point on positioner and measurement object surface is numerical value；
After step 6, gage frame adjustment, putting position of the adjustment cross bar in gage frame, and measuring set of cylinder and measurement
Instrument vertical is put into the position of different centring hole on cross bar, if measurement object surface dry rubbing control point Q1~Qn after measurement polishing
The vertical range of corresponding centring hole and numerical value T1~Tn is recorded on to cross bar, compare R1 and T1, R2 and T2 ... ..., Rn and Tn
Distance, calculate polishing amount；Polishing, measurement work are repeated, until the amount of being polished for a plurality of times sum R1+Rn is equal to desired polishing amount
Afterwards, survey tool is removed.
Device provided by the invention overcomes the deficiencies in the prior art, can control measurement error in 0.02mm, meet to survey
Requirement when amount object is installed at the scene by the precision controlling of polishing amount within 0.1mm, and simple in construction, manufacture and user
Just.
Brief description of the drawings
Fig. 1 is the curved surfaces ozzle polishing survey tool using renderings that the present embodiment provides；
Fig. 2 is the curved surfaces ozzle polishing survey tool front schematic view that the present embodiment provides；
Fig. 3 is the curved surfaces ozzle polishing survey tool stereogram that the present embodiment provides；
Fig. 4 is cross bar stereogram；
Fig. 5 is measuring instrument stereogram；
Fig. 6 is measuring set of cylinder stereogram.
Embodiment
To become apparent the present invention, hereby with preferred embodiment, and the detailed description of attached related data is as follows.
Fig. 1~Fig. 3 is respectively that the curved surfaces ozzle polishing survey tool using renderings that provides of the present embodiment, front show
Intention and stereogram, described curved surfaces ozzle polishing survey tool, including：
Gage frame N, the gage frame are rectangular configuration, and the horizontally disposed arc of transverse bar of gage frame
Degree, to be bonded the curved surfaces of measurement object；
Positioner, positioned at any two diagonal end points of rectangular configuration of gage frame；
Locking device, positioned at gage frame longitudinal rod both sides, for gage frame to be fastened on into measurement object；
Fixed and buffer unit, it is solid for aiding in positioned at gage frame matrix structure longitudinal rod and transverse bar center position
Determine gage frame, and cushioning effect is played to ozzle；
The montant that two root surfaces are disposed with axis hole, are parallel to each other, by the support perpendicular to measurement object, it is arranged in measurement
On framework, and it is parallel with the longitudinal rod of gage frame；
End points has the cross bar J that bearing pin P, surface layout have centring hole M, as shown in figure 4, by bearing pin P along perpendicular to montant
Direction be fixed on montant；
Measuring set of cylinder F, including chassis U and the cylinder V on the U of chassis, cylinder V center are disposed with rectangular channel K, such as Fig. 5
It is shown；
Measuring instrument G, including the measurement bar Y and tapered end Z positioned at measurement bar one end, as shown in Figure 6；
In positioning and measurement, measuring set of cylinder F cylinder V is vertically disposed in cross bar J positioning hole or centring hole Q,
By in measuring instrument G measurement bar Y insertion measuring set of cylinder F rectangular channel K, measuring instrument G is set to be contacted with nozzle surface.
Cylinder V diameter is smaller 0.1mm than the diameter of the centring hole M on cross bar J, makes chassis U diameter than pair on cross bar J
The big 10mm of mesopore M diameters, make rectangular channel K size bigger 0.1mm than measuring instrument G measurement bar Y.
In the particular embodiment, the gage frame is stainless steel；
In the particular embodiment, the positioner in Fig. 1 as being located at two diagonal end points of gage frame rectangular configuration
Shown in positioning hole H1 and positioning hole H2；
In the particular embodiment, the locking device is included in gage frame longitudinal rod both sides upper and lower part same level
Two tight retainer A1, B1, A2, B2 that direction is respectively distributed, two binding straps A, B are each passed through deflation circle A1, A2 and B1, B2, around
Locked after crossing measurement object one week；
In the particular embodiment, the fixation and buffer unit are positioned at gage frame matrix structure longitudinal rod and transverse direction
Hold-down bolt D1, D2, D3, D4 of bar center position, and buffering spacer C1, C2, C3, C4 positioned at hold-down bolt end, pressure
Tight bolt is correspondingly screwed in the clamp sleeve on buffering spacer, and buffering spacer is close into nozzle surface；
In the particular embodiment, cross bar J end points is disposed with magnetic devices K1, K2；
In the particular embodiment, in gage frame longitudinal rod both sides same level direction, respectively distribution two screws in bolts,
Screw in, be close to measurement object surface along perpendicular to measurement object direction；
In the particular embodiment, binding strap A, B, buffering spacer C1, C2, C3, C4, screw-in bolt and measurement object connect
Thick rubber is lined with contacting surface, to increase the frictional force of structure and in-pile component surface and protect in-pile component surface.
The application method of above-mentioned curved surfaces ozzle polishing survey tool, step include：
S1, survey tool is used into binding strap, buffering spacer and is bolted in measurement object；
S2, measuring set of cylinder F cylinder V is vertically disposed in cross bar J positioning hole, by the measurement bar Y in measuring instrument G
Insert in measuring set of cylinder F rectangular channel K, measuring instrument G taper end points Z is contacted with measurement object surface, and utilize measurement
Instrument G measurement and positionings hole H1 and positioning hole H2 to measurement object surface vertical range, record numerical value P1, P2, measuring instrument G with
Contact point mark I1, the I2 on measurement object surface：
If S3, basis, in the pre-determined dry rubbing control point Q1~Qn of nozzle surface, cross bar J is in gage frame N for movement
On position, measure the upper centring hole of cross bar J to the vertical range for the control point Q1~Qn that polishes using S2 method and record numerical value
R1~Rn；
S4, polishing control point is polished, after the completion of polishing, repeatedly the step of S2 is to positioning hole, positioning hole to measurement
The vertical range of subject surface is confirmed；
If the tapered end Z and measurement object surface contact point on S5, measuring instrument G are not mark I1, I2, adjust
Gage frame N, measuring instrument G is set to be overlapped with the contact point on measurement object surface with mark I1, I2；Measurement and positioning hole H1, H2 are extremely
Mark I1, I2 distance whether identical with numerical value P1, the P2 recorded before polishing, such as the tapered end Z on measuring instrument G and measurement
Subject surface contact point is not I1, I2, and adjustment gage frame N marks positioning hole H1, H2 and the contact point on measurement object surface
I1, I2 distance are numerical value P1, P2；
After S6, gage frame N adjustment, by adjust putting position and measuring set of cylinder F of the cross bar J on gage frame N and
Measuring instrument G is vertically put into the position of different centring hole on cross bar J.If measurement object surface dry rubbing control point after measurement polishing
The vertical range of centring hole corresponding on Q1~Qn to cross bar J, and record numerical value T1~Tn.Compare R1 and T1, R2 and
T2 ... ..., Rn and Tn distance, calculate polishing amount.Polishing, measurement work are repeated, until the amount of being polished for a plurality of times sum R1+Rn etc.
After desired polishing amount, survey tool is removed.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (9)
1. a kind of application method of curved surfaces ozzle polishing survey tool, curved surfaces ozzle polishing survey tool include：
Gage frame (N), the gage frame are the rectangular configuration that is made up of longitudinal rod and transverse bar, and transverse bar is along level side
To radian is set, to be bonded the curved surfaces of measurement object；
Positioner, positioned at any two diagonal end points of rectangular configuration of gage frame；
Locking device, positioned at gage frame longitudinal rod both sides, for gage frame to be fastened on into measurement object；
Fixed and buffer unit, positioned at gage frame longitudinal rod and transverse bar center position, for aiding in fixation measuring framework, and
Cushioning effect is played to ozzle；
The montant that surface layout has axis hole, is parallel to each other, by the support perpendicular to measurement object, it is arranged in gage frame,
It is and parallel with the longitudinal rod of gage frame；
End points has the cross bar (J) that bearing pin, surface layout have centring hole (M), and edge is fixed on montant perpendicular to the direction of montant；
Measuring set of cylinder (F), including chassis (U) and the cylinder (V) on chassis (U), cylinder (V) center are disposed with rectangular channel
(K)；
Measuring instrument (G), including measurement bar (Y) and the tapered end (Z) positioned at measurement bar one end；
In positioning and measurement, the cylinder (V) of measuring set of cylinder (F) is vertical in cross bar (J) centring hole (M), measuring instrument
(G) in the rectangular channel (K) of measurement bar (Y) insertion measuring set of cylinder (F), measuring instrument (G) is made to be contacted with nozzle surface；
Characterized in that, the application method step is：
Step 1, survey tool is fixed in measurement object；
Step 2, measuring set of cylinder (F) cylinder (V) is vertically disposed in cross bar (J) centring hole (M), by measuring instrument (G)
In measurement bar (Y) insertion measuring set of cylinder (F) rectangular channel (K) in, make the taper end points (Z) of measuring instrument (G) and measurement pair
As surface contacts, and using measuring instrument (G) measurement positioned at two diagonal end points of gage frame positioner to measurement object table
The vertical range in face, record numerical value (P1, P2), measuring instrument (G) and the contact point mark (I1, I2) on measurement object surface；
If step 3, according in the pre-determined dry rubbing control point (Q1~Qn) of nozzle surface, mobile cross bar (J) is in measurement frame
Position on frame (N), using the method for step 2 measure centring hole (M) on cross bar (J) to polishing control point Q1~Qn it is vertical away from
From, and record numerical value R1~Rn；
Step 4, polishing control point is polished, after the completion of polishing, repeat step 2, to positioner, positioner to measurement
The vertical range of subject surface is confirmed；
If the tapered end (Z) in step 5, measuring instrument (G) is not mark (I1, I2) with measurement object surface contact point,
Then adjusting gage frame (N) makes measuring instrument (G) and the contact point on measurement object surface be overlapped with mark (I1, I2)；Measurement is fixed
Whether position device is to marking the distance of (I1, I2) identical with the numerical value (P1, P2) that is recorded before polishing, in measuring instrument (G)
Tapered end (Z) is not mark (I1, I2) with measurement object surface contact point, and adjusting gage frame (N) makes positioner with surveying
The distance for measuring the contact point mark (I1, I2) of subject surface is numerical value (P1, P2)；
After step 6, gage frame (N) adjustment, putting position of the adjustment cross bar (J) in gage frame (N), and measuring set of cylinder
(F) and measuring instrument (G) is vertically put into the position of different centring hole on cross bar (J), and measurement object surface is some after measurement polishing
Polishing control point Q1~Qn to corresponding centring hole on cross bar (J) vertical range and record numerical value T1~Tn, compare R1 and T1,
R2 and T2 ... ..., Rn and Tn distance, calculate polishing amount；Polishing, measurement work are repeated, until the amount of being polished for a plurality of times sum R1+
After Rn is equal to desired polishing amount, survey tool is removed.
A kind of 2. application method of curved surfaces ozzle polishing survey tool as claimed in claim 1, it is characterised in that：It is described
Gage frame is stainless steel.
A kind of 3. application method of curved surfaces ozzle polishing survey tool as claimed in claim 1, it is characterised in that：It is described
Montant is two.
A kind of 4. application method of curved surfaces ozzle polishing survey tool as claimed in claim 1, it is characterised in that：It is described
Positioner is positioning pore structure.
A kind of 5. application method of curved surfaces ozzle polishing survey tool as claimed in claim 1, it is characterised in that：It is described
Locking device is included in the tight retainer that gage frame longitudinal rod both sides same level direction is distributed respectively, and binding strap is each passed through together
The deflation circle of one horizontal direction, around measurement object one enclose or multi-turn after lock.
A kind of 6. application method of curved surfaces ozzle polishing survey tool as described in claim 1 or 5, it is characterised in that：
The fixation and buffer unit include the hold-down bolt located at gage frame longitudinal rod and transverse bar center position, and positioned at pressure
The buffering spacer of tight bolt end, hold-down bolt are correspondingly screwed in clamp sleeve, and buffering spacer is close into nozzle surface.
A kind of 7. application method of curved surfaces ozzle polishing survey tool as claimed in claim 1, it is characterised in that：It is described
The end of cross bar (J) is disposed with magnetic devices.
A kind of 8. application method of curved surfaces ozzle polishing survey tool as claimed in claim 6, it is characterised in that：It is described
Screw-in bolt is respectively distributed with gage frame longitudinal rod both sides same level direction, screws in bolt and is revolved along perpendicular to measurement object direction
Enter, be close to measurement object surface.
A kind of 9. application method of curved surfaces ozzle polishing survey tool as claimed in claim 8, it is characterised in that：It is described
Binding strap, buffering spacer, screw on the contact surface of bolt and measurement object and be lined with rubber blanket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610182179.6A CN105817997B (en) | 2016-03-28 | 2016-03-28 | A kind of curved surfaces ozzle polishing survey tool and its application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610182179.6A CN105817997B (en) | 2016-03-28 | 2016-03-28 | A kind of curved surfaces ozzle polishing survey tool and its application method |
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| Publication Number | Publication Date |
|---|---|
| CN105817997A CN105817997A (en) | 2016-08-03 |
| CN105817997B true CN105817997B (en) | 2018-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610182179.6A Active CN105817997B (en) | 2016-03-28 | 2016-03-28 | A kind of curved surfaces ozzle polishing survey tool and its application method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107020573A (en) * | 2017-06-05 | 2017-08-08 | 上海第机床厂有限公司 | In-pile component outlet nozzle polishing measurement apparatus and the method for measurement polishing |
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| CN201463859U (en) * | 2009-07-28 | 2010-05-12 | 钱菊生 | Arc-shaped continuous caster sector section two-way cantilever type measuring rod three-dimensional test table |
| CN102435163A (en) * | 2011-09-20 | 2012-05-02 | 长沙理工大学 | Hydroturbine blade profile measurement device and method |
| CN202216627U (en) * | 2011-07-14 | 2012-05-09 | 深圳奔迅汽车玻璃有限公司 | Dimension measuring device used for pre-processing of automobile glass |
| CN203371304U (en) * | 2013-07-25 | 2014-01-01 | 云南冶金昆明重工有限公司 | Clamping device capable of effectively maintaining machining precision of inner hole of thin-shell workpiece |
| CN204694255U (en) * | 2015-04-10 | 2015-10-07 | 中交天航南方交通建设有限公司 | A kind of square installs and measures frame |
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2016
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4146967A (en) * | 1977-08-15 | 1979-04-03 | The Boeing Company | Rotor blade inspection fixture |
| CN201463859U (en) * | 2009-07-28 | 2010-05-12 | 钱菊生 | Arc-shaped continuous caster sector section two-way cantilever type measuring rod three-dimensional test table |
| CN202216627U (en) * | 2011-07-14 | 2012-05-09 | 深圳奔迅汽车玻璃有限公司 | Dimension measuring device used for pre-processing of automobile glass |
| CN102435163A (en) * | 2011-09-20 | 2012-05-02 | 长沙理工大学 | Hydroturbine blade profile measurement device and method |
| CN203371304U (en) * | 2013-07-25 | 2014-01-01 | 云南冶金昆明重工有限公司 | Clamping device capable of effectively maintaining machining precision of inner hole of thin-shell workpiece |
| CN204694255U (en) * | 2015-04-10 | 2015-10-07 | 中交天航南方交通建设有限公司 | A kind of square installs and measures frame |
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| CN105817997A (en) | 2016-08-03 |
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Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Patentee after: CHINA NUCLEAR INDUSTRY 23 CONSTRUCTION Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. Patentee before: CHINA NUCLEAR INDUSTRY 23 CONSTRUCTION Co.,Ltd. |
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