CN107525494B - Laser plummet fixing device and reference laser establishing method of spherical tube bundle assembly - Google Patents
Laser plummet fixing device and reference laser establishing method of spherical tube bundle assembly Download PDFInfo
- Publication number
- CN107525494B CN107525494B CN201710570615.1A CN201710570615A CN107525494B CN 107525494 B CN107525494 B CN 107525494B CN 201710570615 A CN201710570615 A CN 201710570615A CN 107525494 B CN107525494 B CN 107525494B
- Authority
- CN
- China
- Prior art keywords
- fixing
- laser
- laser plummet
- base
- centering
- 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
- 238000000034 method Methods 0.000 title claims description 10
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 238000003780 insertion Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/002—Active optical surveying means
- G01C15/004—Reference lines, planes or sectors
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Laser Beam Processing (AREA)
- Lasers (AREA)
Abstract
The invention discloses a laser plummet fixing device which comprises a base, wherein a supporting piece is arranged at the top of the base, a fixing part capable of fixing a laser plummet is arranged on the supporting piece, an optical alignment channel is arranged on the supporting piece, a fixing clamping groove is arranged at the side part of the base, a centering observation hole corresponding to the alignment channel is arranged at the top of the base, and the centering observation hole is communicated with the fixing clamping groove. The laser plummet is fixed on the support piece by a worker through the support piece arranged on the fixing device base, and the fixing device is arranged at a required position through the fixing clamping groove on the base; the laser plummet is fixed on the clamping surface of the tube bundle assembly through the fixing device, and the laser is used as a reference line, so that compared with a solid line, the laser has a better alignment effect, the insertion of the anti-vibration strip assembly cannot be influenced, and the assembly efficiency is greatly improved. The invention is applied to the field of nuclear power equipment.
Description
Technical Field
The invention relates to the field of nuclear power, in particular to a laser plummet fixing device and a reference laser establishing method of a spherical tube bundle assembly.
Background
The CAP1400/CAP 1000/Hualong I reactor type steam generator tube bundle assembly is used as a lung of nuclear power, is also a pressure boundary of a primary side and a secondary side of a reactor, and plays an important role in reliability, safety and effectiveness of the whole service life (60 years) of a reactor system. The CAP1400/CAP 1000/Hualong I stack type steam generator tube bundle part is spherical, mainly comprises dense heat exchange tubes and anti-vibration strips embedded in the dense heat exchange tubes, and is represented as a regular embedded anti-vibration strip assembly in a spherical tube bundle assembly in appearance. After two rows of heat exchange tubes adjacent to the anti-vibration strip assembly penetrate through the tube plate, the anti-vibration strip assembly is inserted into the two rows of heat exchange tubes from deep to shallow, in order to restrain the heat exchange tubes from generating harmful flow-induced vibration, the anti-vibration strip assembly needs to be inserted into the spherical tube bundle by a specified depth to ensure the lap joint with the corresponding tubes and be symmetrical left and right, and therefore base line alignment needs to be completed on the tube bundle assembly. At present, a wire drawing method is generally adopted for aligning baselines of tube bundle assemblies, but accumulated errors are generated due to repeated removal and recovery of measurement datum lines, the measurement results are affected after the accumulated errors reach a certain amount, meanwhile, the datum lines are solid, the insertion of each layer of anti-vibration strip assembly is solid and continuous, and inevitable interference occurs, so that special attention is needed for installation of the anti-vibration strip assembly, and the assembly efficiency is seriously affected.
Disclosure of Invention
In order to solve the above problems, it is an object of the present invention to provide a laser plummet fixing apparatus capable of effectively fixing a laser plummet and mounting the laser plummet at a desired position.
The technical scheme adopted by the invention is as follows: the utility model provides a laser plummet fixing device, includes the base, the base top is equipped with support piece, be equipped with the fixed part that can fix the laser plummet on the support piece, be equipped with the optics on the support piece and aim at the passageway, the base lateral part is equipped with fixed slot, the base top is equipped with and aims at the corresponding centering observation hole of passageway with the optics, the centering observation hole communicates with each other with fixed slot.
As a further improvement of the above technical solution, the supporting member includes a bottom plate, the bottom plate is fixedly connected to the base through a connecting rod, a first moving assembly is transversely slidably connected to the bottom plate, and a first optical alignment hole is formed in the first moving assembly.
As a further improvement of the above technical solution, the first moving assembly is longitudinally slidably connected with a second moving assembly, the second moving assembly is provided with a second optical alignment hole, the first optical alignment hole is communicated with the second optical alignment hole to form an optical alignment channel, and the fixing portion is disposed at the top of the second moving assembly.
As a further improvement of the above technical solution, the fixing portion includes three fixing members, the three fixing members are distributed on the top of the second moving assembly in a triangular structure, the three fixing members enclose a space capable of fixing the laser plummet, and the second optical alignment hole is located in a central region of the space.
As a further improvement of the above solution, any one of the fixtures has a stroke of movement in a radial direction centered on the second optical alignment hole.
As a further improvement of the above technical solution, the first moving assembly is provided with a first fine adjustment nut capable of limiting the sliding of the first moving assembly, and the second moving assembly is provided with a second fine adjustment nut capable of limiting the sliding of the second moving assembly.
As a further improvement of the technical scheme, the base is of a C-shaped structure, the fixing clamping groove is a C-shaped opening of the C-shaped structure, and the bottom of the base is provided with a fixing screw.
As a further improvement of the above technical solution, an extension plate is provided on the other side portion of the base corresponding to the fixing slot.
The invention also provides a reference laser establishing method of the spherical tube bundle assembly, which comprises the following steps:
a. manufacturing two centering targets on the circular clamping surface, wherein the two centering targets are positioned on the same diameter;
b. fixing the laser plummet on a centering target through the laser plummet fixing device, wherein the laser plummet is fixedly connected with a supporting piece, a base is fixedly connected with a circular clamping surface, and the centering target is superposed with a centering observation hole and is positioned on an extension line of an optical alignment channel;
c. and starting the laser plummet, wherein a cursor of the optical centering system at one end of the laser plummet is aligned with one centering target, and laser of the laser generator at the other end of the laser plummet is aligned with the other centering target.
As a further improvement of the above technical solution, in step c, the laser plummet fixing device is adjusted to make both ends of the laser plummet respectively aligned with the two centering targets.
The invention has the beneficial effects that: according to the laser plummet disclosed by the invention, the support piece is arranged on the base of the fixing device, a worker fixes the laser plummet on the support piece, and the fixing device is installed at a required position through the fixing clamping groove on the base; the laser plummet is fixed on the clamping surface of the tube bundle assembly through the fixing device, and the laser is used as a reference line, so that compared with a solid line, the laser has a better alignment effect, the insertion of the anti-vibration strip assembly cannot be influenced, and the assembly efficiency is greatly improved.
Drawings
The invention is further described with reference to the following figures and embodiments.
FIG. 1 is a schematic view of a laser plummet fixture;
FIG. 2 is a schematic illustration of a baseline laser build-up method for a bulb bundle assembly.
Detailed Description
The laser plummet fixing device shown in fig. 1 comprises a base 1, wherein a support piece 2 is arranged at the top of the base 1, a fixing part 21 capable of fixing the laser plummet is arranged on the support piece 2, an optical alignment channel is arranged on the support piece 2, a fixing clamping groove 11 is arranged on the side part of the base 1, a centering observation hole 12 corresponding to the optical alignment channel is arranged at the top of the base 1, and the centering observation hole 12 is communicated with the fixing clamping groove 11.
The working principle of the fixing device of the embodiment is as follows: in the process of establishing a reference line using a laser plummet, a worker first sets two centering targets on a straight line to be aligned, then installs a fixture at the position of one of the centering targets and coincides the centering targets with the centering observation holes 12, and then installs the laser plummet on the fixture. And starting the laser plummet, enabling a cursor of an optical centering system at one end of the laser plummet to pass through the optical alignment channel and then fall on a centering target in the centering observation hole 12, enabling laser of a laser centering system at the other end of the laser plummet to fall on the other centering target, enabling the laser to be a reference line at the moment, and completing the establishment work of the reference line.
Preferably, the supporting member 2 includes a bottom plate 22, the bottom plate 22 is fixedly connected to the base 1 through a connecting rod 3, a first moving assembly 23 is transversely slidably connected to the bottom plate 22, and a first optical alignment hole is formed in the first moving assembly 23. The connecting rod 3 is used for connecting the bottom plate 22 with the base 1, so that the bottom plate 22 and the base 1 form an interval, and a worker can conveniently observe whether a cursor of the optical centering system accurately falls on a centering target in the centering observation hole 12. The first moving component 23 is longitudinally connected with a second moving component 24 in a sliding manner, the second moving component 24 is provided with a second optical alignment hole 241, the first optical alignment hole is communicated with the second optical alignment hole 241 and forms an optical alignment channel, and the fixing portion 21 is arranged at the top of the second moving component 24 and is located on the same horizontal plane in the transverse direction and the longitudinal direction in the embodiment.
A first slide rail is arranged at the top of the bottom plate 22, a first slide block corresponding to the first slide rail is arranged on the first moving assembly 23, and the first moving assembly 23 is transversely connected to the first slide rail in a sliding manner through the first slide block; the top of the second moving component 24 is provided with a second slide rail, the second moving component 24 is provided with a second slide block corresponding to the second slide rail, and the second moving component 24 is transversely connected to the second slide rail through the second slide block in a sliding manner. The worker slides the first moving assembly 23 and the second moving assembly 24 to change the position of the laser plummet until the establishment of the datum line is completed.
Preferably, the fixing portion 21 includes three fixing members, the three fixing members are distributed on the top of the second moving assembly 24 in a triangular structure, the three fixing members enclose a space capable of fixing the laser plummet, and the second optical alignment hole 241 is located in a central region of the space. The laser plummet is secured to the second motion assembly 24 by three fasteners.
Preferably, any one of the fixing members has a moving stroke in a radial direction centering on the second optical alignment hole 241, the top of the second moving assembly 24 is provided with three strip-shaped grooves corresponding to the fixing members in the radial direction centering on the second optical alignment hole 241, each fixing member is connected to the corresponding strip-shaped groove by bolts, and the fixing portions can fix laser plummets of different models or sizes by moving the three fixing members.
Preferably, the first moving assembly 23 is provided with a first fine adjustment nut 231 capable of limiting the first moving assembly 23 to slide, the second moving assembly 24 is provided with a second fine adjustment nut 242 capable of limiting the second moving assembly 24 to slide, and the position of the laser plummet or the cursor of the laser plummet can be adjusted more accurately through the first fine adjustment nut 231 and the second fine adjustment nut 242.
Preferably, the base 1 is a C-shaped structure, the fixing clamping groove 11 is a C-shaped opening of the C-shaped structure, and the bottom of the base 1 is provided with a fixing screw 13.
Preferably, an extension plate 14 is arranged on the other side portion of the base 1 corresponding to the fixing slot 11, and a distance measuring tool is arranged on the extension plate 14 to improve the functionality of the fixing device.
Referring to fig. 2, the present invention further provides a method for establishing a reference laser of a spherical tube bundle assembly, which is used for installing a CAP1400/CAP 1000/hualong first-number stack type steam generator tube bundle assembly, and comprises the following steps:
a. two centering targets 5 are manufactured on the circular clamping surface 4, and the two centering targets 5 are positioned on the same diameter;
b. fixing the laser plummet 6 on a centering target by the laser plummet fixing device, wherein the laser plummet 6 is fixedly connected with the supporting piece 2, the base 1 is fixedly connected with the circular clamping surface 4, and the centering target is superposed with the centering observation hole and is positioned on the extension line of the optical alignment channel;
c. starting the laser plummet 6, aligning the cursor of the optical centering system at one end of the laser plummet 6 with one centering target, and aligning the laser of the laser generator at the other end with the other centering target.
The laser plummet is fixed on the clamping surface of the tube bundle assembly through the fixing device, and the laser is used as a reference line, so that compared with a solid line, the laser has a better alignment effect, the insertion of the anti-vibration strip assembly cannot be influenced, and the assembly efficiency is greatly improved.
Preferably, in the step b, the base 1 of the laser plummet fixing device is fixedly connected with the circular clamping surface 4, the laser plummet 6 is fixedly connected with the supporting piece 2, and the centering observation hole is coincided with the centering target when the laser plummet fixing device is installed; and c, adjusting a first fine adjustment nut and a second fine adjustment nut on the laser plummet fixing device to enable two ends of the laser plummet to be respectively aligned with the two centering targets.
The present invention is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (7)
1. The utility model provides a laser plummet fixing device which characterized in that: the laser plummet comprises a base (1), wherein a supporting piece (2) is arranged at the top of the base (1), a fixing part (21) capable of fixing a laser plummet is arranged on the supporting piece (2), an optical alignment channel is arranged on the supporting piece (2), a fixing clamping groove (11) is arranged on the side part of the base (1), a centering observation hole (12) corresponding to the optical alignment channel is arranged at the top of the base (1), the centering observation hole (12) is communicated with the fixing clamping groove (11), the supporting piece (2) comprises a bottom plate (22), the bottom plate (22) is fixedly connected with the base (1) through a connecting rod (3), a first moving component (23) is transversely connected with the bottom plate (22) in a sliding manner, a first optical alignment hole is arranged on the first moving component (23), and a second moving component (24) is longitudinally connected with the first moving component (23) in a sliding manner, the second moving assembly (24) is provided with a second optical alignment hole (241), the fixed part (21) comprises three fixing pieces, the three fixing pieces are distributed on the top of the second moving assembly (24) in a triangular structure, the three fixing pieces surround to form a space capable of fixing the laser plummet, the second optical alignment hole (241) is positioned in the central area of the space, the laser plummet is fixed on a second moving assembly (24) by three fixing pieces, any one of the fixing pieces has a moving stroke in a radial direction taking a second optical alignment hole (241) as a center, the top of the second moving assembly (24) is provided with three strip-shaped grooves corresponding to the fixing pieces along the radial direction taking the second optical alignment hole (241) as the center, each fixing piece is connected with the corresponding strip-shaped groove through a bolt, by moving the three fixing pieces, the fixing part (21) can fix laser plummets of different models or sizes.
2. The laser plummet fixture of claim 1, wherein: the first optical alignment hole is communicated with the second optical alignment hole (241) and forms an optical alignment channel, and the fixed part (21) is arranged at the top of the second movable component (24).
3. The laser plummet fixture of claim 2, wherein: the first moving component (23) is provided with a first fine adjustment nut (231) capable of limiting the first moving component (23) to slide, and the second moving component (24) is provided with a second fine adjustment nut (242) capable of limiting the second moving component (24) to slide.
4. A laser plummet fixture according to any one of claims 1 to 3, wherein: the base (1) is of a C-shaped structure, the fixing clamping groove (11) is of a C-shaped opening of the C-shaped structure, and a fixing screw (13) is arranged at the bottom of the base (1).
5. The laser plummet fixture of claim 4, wherein: and an extension plate (14) is arranged on the other side part of the base (1) corresponding to the fixed clamping groove (11).
6. A reference laser establishing method of a spherical tube bundle assembly is characterized by comprising the following steps:
a. two centering targets (5) are manufactured on the circular clamping surface (4), and the two centering targets (5) are positioned on the same diameter;
b. -fixing the laser plummet (6) on a centering target by means of the laser plummet fixing device according to any of the claims 1 to 5, the laser plummet (6) being fixedly connected to the support (2), the base (1) being fixedly connected to the circular clamping surface (4), the centering target coinciding with the centering sight hole and being located on the extension of the optical alignment channel;
c. and starting the laser plummet (6), wherein the cursor of the optical centering system at one end of the laser plummet (6) is aligned with one centering target, and the laser of the laser generator at the other end is aligned with the other centering target.
7. The fiducial laser build-up method for a bundle assembly of spherical tubes as recited in claim 6, wherein: and c, adjusting the laser plummet fixing device to enable two ends of the laser plummet to be respectively aligned with the two centering targets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710570615.1A CN107525494B (en) | 2017-07-13 | 2017-07-13 | Laser plummet fixing device and reference laser establishing method of spherical tube bundle assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710570615.1A CN107525494B (en) | 2017-07-13 | 2017-07-13 | Laser plummet fixing device and reference laser establishing method of spherical tube bundle assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107525494A CN107525494A (en) | 2017-12-29 |
| CN107525494B true CN107525494B (en) | 2020-08-28 |
Family
ID=60749092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710570615.1A Active CN107525494B (en) | 2017-07-13 | 2017-07-13 | Laser plummet fixing device and reference laser establishing method of spherical tube bundle assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107525494B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112975268B (en) * | 2021-05-12 | 2021-08-06 | 上海电气核电设备有限公司 | Installation method of anti-seismic strip of steam generator |
| EP4148380A1 (en) | 2021-09-09 | 2023-03-15 | Techtronic Cordless GP | Device and method for laser alignment |
| CN113878529B (en) * | 2021-11-22 | 2022-10-18 | 山东大学 | A high-precision alignment manufacturing method and device for shell-and-tube heat exchangers |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101165456A (en) * | 2006-10-17 | 2008-04-23 | 张敏俐 | Self-balancing rotary laser |
| CN101566472A (en) * | 2009-05-22 | 2009-10-28 | 南京航空航天大学 | Coordinate positioning auxiliary device for laser tracker used for large-scale curved surface |
| US7926191B2 (en) * | 2008-07-28 | 2011-04-19 | Lecc Technology Co., Ltd. | Laser guiding device for machine tools |
| CN204313839U (en) * | 2014-10-28 | 2015-05-06 | 中铁建设集团有限公司 | A kind of laser plummet axis projection mounting base |
| JP5830526B2 (en) * | 2010-04-30 | 2015-12-09 | インターデイジタル パテント ホールディングス インコーポレイテッド | Home node identification, interference reduction, and energy saving |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5830526B2 (en) * | 1979-11-08 | 1983-06-29 | 有行 加藤 | Plummet on the measuring point |
| JPH09243370A (en) * | 1996-03-13 | 1997-09-19 | Toyo Techno Kk | Laser marking device |
| CN202066511U (en) * | 2011-02-23 | 2011-12-07 | 浙江吉利汽车研究院有限公司 | Angle-adjustable laser gun mounting base |
| CN205642375U (en) * | 2016-05-03 | 2016-10-12 | 三门峡龙王庄煤业有限责任公司 | Tunnel laser guide instrument fixing device |
| CN107525493B (en) * | 2016-06-20 | 2024-03-29 | 乔佰文 | Laser direction indicator |
| CN106017435B (en) * | 2016-06-30 | 2019-08-20 | 中交一航局第四工程有限公司 | A kind of laser aid and its application method |
-
2017
- 2017-07-13 CN CN201710570615.1A patent/CN107525494B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101165456A (en) * | 2006-10-17 | 2008-04-23 | 张敏俐 | Self-balancing rotary laser |
| US7926191B2 (en) * | 2008-07-28 | 2011-04-19 | Lecc Technology Co., Ltd. | Laser guiding device for machine tools |
| CN101566472A (en) * | 2009-05-22 | 2009-10-28 | 南京航空航天大学 | Coordinate positioning auxiliary device for laser tracker used for large-scale curved surface |
| JP5830526B2 (en) * | 2010-04-30 | 2015-12-09 | インターデイジタル パテント ホールディングス インコーポレイテッド | Home node identification, interference reduction, and energy saving |
| CN204313839U (en) * | 2014-10-28 | 2015-05-06 | 中铁建设集团有限公司 | A kind of laser plummet axis projection mounting base |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107525494A (en) | 2017-12-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107525494B (en) | Laser plummet fixing device and reference laser establishing method of spherical tube bundle assembly | |
| CN216682035U (en) | Cylinder body spring press-fitting mechanism | |
| CN106001242A (en) | Full-automatic hydraulic punching machine | |
| CN103418969A (en) | Special-shaped pipe fitting welding auxiliary clamp | |
| CN104723094A (en) | Adjusting device for equipment installing alignment | |
| CN104227302A (en) | Overall welding and detection device for bracket | |
| CN207723942U (en) | A kind of cutting clamper of thin-wall stainless steel pipe fitting | |
| CN108438877B (en) | Device is put in getting of bogie spring | |
| CN103639766A (en) | Positioning fixture for borehole | |
| CN103499259B (en) | 360 degree of conducting rod installing plate positioning rules and localization method | |
| CN203863266U (en) | Manufacturing tool for section-variable truss arm | |
| CN104785814A (en) | Drilling worktable for manufacturing tube support plates and method of manufacturing tube support plates using the same | |
| CN203375942U (en) | Calibrating device disposed on elevator guide rail | |
| CN218955621U (en) | Bent pipe checking fixture | |
| CN104942611A (en) | Adjustable horizontal device for assisting installation of multi-stand-column supporting structure | |
| CN105065876A (en) | Greenhouse gas emission monitoring equipment | |
| CN203869628U (en) | Engine valve cone thickness size gauge | |
| CN205393918U (en) | Cylindricality part welding auxiliary assembly | |
| CN204487412U (en) | A kind of wind power blade tip lightening portion arrester positioning tool | |
| CN101596651B (en) | Hydraulic support structural member spring tube hole processing and spring tube assembly method | |
| CN213969467U (en) | A change device that is used for welder to change electrode cap | |
| CN105973098B (en) | A kind of electric car main support performance universal check tool | |
| CN204740270U (en) | Paster transformer tool for production test | |
| CN209510324U (en) | Measuring instrument placing device in a kind of measurement of shield tunnel | |
| CN116748724B (en) | Device and method for replacing pipe guide rails |
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 |