CN101865750B - Portable calibrating device for pull pressure sensor - Google Patents
Portable calibrating device for pull pressure sensor Download PDFInfo
- Publication number
- CN101865750B CN101865750B CN 201010204961 CN201010204961A CN101865750B CN 101865750 B CN101865750 B CN 101865750B CN 201010204961 CN201010204961 CN 201010204961 CN 201010204961 A CN201010204961 A CN 201010204961A CN 101865750 B CN101865750 B CN 101865750B
- Authority
- CN
- China
- Prior art keywords
- sensor
- calibration
- calibrating installation
- force
- pull pressure
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a pull pressure sensor which is a sensor used for pull pressure measurement of an aircraft elevator control system. The sensor has the characteristics of two-way force measurement, long range, high precision, continuous application force value points and the like. Aiming at solving the problem that weight calibration cannot realize the continuous loading of a force value in the traditional method of dead weight type (weight) calibration, a pull pressure calibration device is developed in the invention based on a hydraulic sensor technology and comprises a one-way quantitative hydraulic pump, a bidirectional hydraulic control module, a one-way oil-return device, a special calibration clamp, a calibration force sensor and a standard force value display. The device is developed based on a measurement principle of a back-to-back comparative method, intensively solves three key problems on two-way continuous force source, two-way large-range loading force (100,000N) and portability (26cm*21cm*82cm) of the whole set of device. The device can also be used for the calibration of the pull pressure sensors with the precision lower than 0.05 percent in other fields.
Description
Technical field
The present invention relates to a kind of calibrating device for sensors, specifically, relate to a kind of calibrating installation for aircraft evelvator control system pull pressure sensor.
Background technology
The aircraft evelvator control system is the control system of aircraft taxi direction and flight attitude, mainly stretch out the power value output that driving force, the right side are stretched out 6 directions such as driving force, left withdrawal driving force, right withdrawal driving force, left output rocking arm power and right output rocking arm power by a left side, line of travel and flight attitude to aircraft are controlled, and the accuracy of power output value directly affects flight quality and flight safety.The at present measurement of these power values mainly relies on pull pressure sensor in the steering wheel hydraulic test bench and supporting display device thereof, require these sensors are carried out periodic calibration according to national metrological verification regulations, to guarantee its performance parameter and technical indicator accurately and reliably.
All adopt net weight formula (counterweight) calibration steps for wide range pull pressure sensor (more than the 30000N) at present, this method precision is high, good reliability, but these counterweights are bulky, carry inconvenience, and most net weight formula metrological standard unit is comprised of fixed lever and motor drive mechanism, do not possess the condition of carrying, can not carry out portable, motor driven metering.In addition, described pull pressure sensor is to be applied in the continuous environment that loads of power value, and net weight formula calibrating installation does not possess the continuous value-added tax function of power value, and this calibration for the sensor nonlinear parameter has significant limitation.
Standard transducer refers to be used as the power sensor of standard set-up in calibration pull pressure sensor process.Standard transducer is relative concept, and when the ratio of the uncertainty of measurement of certain sensor and the uncertainty of measurement of tested sensor is lower than 1/3, and this sensor passed through repeatability, stability assessment, and then this sensor just can be called standard transducer.In the present invention, standard transducer employing measuring accuracy is 0.03% proof force sensor.
Summary of the invention
Purpose of the present invention just is for above-mentioned the deficiencies in the prior art, and a kind of calibration problem that can solve the wide range pull pressure sensor is provided.
The objective of the invention is to realize by following portable calibrating device for pull pressure sensor.
A kind of calibrating installation for aircraft evelvator control system pull pressure sensor is made of unidirectional quantitative hydraulic pump, bidirectional hydraulic control module, unidirectional oil return apparatus, calibration unit clamp, proof force sensor group and this 6 part of proof force value display; Described bidirectional hydraulic control module is made of oil circuit cross-over valve, bidirectional hydraulic lock and oil cylinder; Described unidirectional oil return apparatus is made of oil accumulator, retaining valve and oil return conduit; Described calibration unit clamp is made of housing, level governor, weighing bracket, upper and lower bottom plate, upper and lower bottom plate anchor clamps, level meter and the coaxial anchor clamps of sensor; Described power value display is made of power value capture card, data processing unit, power value display unit and calibration special module.
As shown in drawings, the annexation of each parts of the present invention is: housing 13 is peripheral casing, inner oil cylinder 9, oil circuit cross-over valve 8, bidirectional hydraulic lock 7 and the return line placed.Bidirectional hydraulic lock 7 is connected with unidirectional quantitative hydraulic pump 1 usefulness hydraulic hose; The piston top of oil cylinder 9 connects lower shoe anchor clamps 18, lower shoe anchor clamps connection standard power sensor 5, the coaxial anchor clamps 21 of proof force sensor top connecting sensor, the coaxial anchor clamps of sensor top connects by the dynamometry sensor, connected upper plate anchor clamps 19 by dynamometry sensor top, upper and lower base plate anchor clamps connect weighing bracket 15.Simultaneously, proof force sensor 5 links to each other with proof force value display 6, and tested sensor is connected with tested sensor force value display.
Described portable calibrating device for pull pressure sensor wherein, is connected standard transducer with tested sensor " back-to-back " coaxial rigid, bear the power of equidirectional and size to guarantee standard transducer and tested sensor.
Described portable calibrating device for pull pressure sensor, wherein, the calibration unit clamp is the calibration clamp with " angled pin ", and this angled pin is mutually vertical with weighing bracket, and its effect is that the deformation that guarantees calibration clamp can not exert an influence to the force measurement result.
Described portable calibrating device for pull pressure sensor, wherein, described calibrating installation is applicable to height to the continuous loading of the bidirectional force of 100000N range.
Described portable calibrating device for pull pressure sensor, wherein, described calibrating installation calibration accuracy reaches 0.05%.
Described portable calibrating device for pull pressure sensor, wherein, described calibrating installation possesses little volume to 26cm * 21cm * 82cm and light weight to 50KG.
Described portable calibrating device for pull pressure sensor, wherein, described power value display (6) can compatible 7 standard transducers.
The present invention has following beneficial effect:
Portable pressure calibrating installation provided by the invention can be applied to the force measurement of the calibration of airplane hydraulic pressure gear train, the maintenance of weaponry pressure multi-function test stand and the multiple vertical load of industrial circle mechanism, as long as be used for measuring the power sensor in two-way 100000N (10 tons) the static force value scope, all can on the basis of the corresponding anchor clamps of design, use this calibrating installation to calibrate.
Will also be appreciated that above embodiment only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement also are considered as protection scope of the present invention.
Description of drawings
Fig. 1: the portable calibrating device for pull pressure sensor schematic diagram, wherein each component names and Reference numeral is corresponding as follows: unidirectional quantitative hydraulic pump 1, bidirectional hydraulic control module 2, unidirectional oil return apparatus 3, calibration unit clamp 4, proof force sensor 5 and proof force value display 6;
Fig. 2: bidirectional hydraulic control module structural drawing, wherein each component names and Reference numeral is corresponding as follows: unidirectional quantitative hydraulic pump 1, oil circuit cross-over valve 7, bidirectional hydraulic lock 8 and oil cylinder 9;
Fig. 3: unidirectional oil return apparatus synoptic diagram, wherein each component names and Reference numeral is corresponding as follows: unidirectional quantitative hydraulic pump 1, oil circuit cross-over valve 7, bidirectional hydraulic lock 8 and oil cylinder 9, oil accumulator 10, retaining valve 11 and oil return conduit 12; And
Fig. 4: special-purpose calibration clamp synoptic diagram, wherein each component names and Reference numeral is corresponding as follows: the coaxial anchor clamps 21 of housing 13, level governor 14, weighing bracket 15, lower shoe 16, upper plate 17, lower shoe anchor clamps 18, upper plate anchor clamps 19, level meter 20 and sensor.
Embodiment
Patent of the present invention is described further with specific embodiment below in conjunction with accompanying drawing.
As shown in drawings:
Portable calibrating device for pull pressure sensor of the present invention is made of unidirectional quantitative hydraulic pump 1, bidirectional hydraulic control module 2, unidirectional oil return apparatus 3, calibration unit clamp 4, proof force sensor 5 and proof force value display 6 these 6 parts; Described bidirectional hydraulic control module 2 is made of oil circuit cross-over valve 7, bidirectional hydraulic lock 8 and oil cylinder 9; Described unidirectional oil return apparatus 3 is made of oil accumulator 10, retaining valve 11 and oil return conduit 12; Described calibration unit clamp 4 is made of the coaxial anchor clamps 21 of housing 13, level governor 14, weighing bracket 15, lower shoe 16, upper plate 17, lower shoe anchor clamps 18, upper plate anchor clamps 19, level meter 20 and sensor;
Wherein, described special-purpose calibration clamp 4 needs the whole series to be used, and each screw flight that forms special-purpose calibration clamp 4 has adopted the design of intensification refinement, is in order to reduce the uncertainty that deformation brings that contacts between screw thread and sensor.In addition, install in the process of this calibrating installation, installation steps are very crucial, must install according to the program of setting, with the position science guaranteeing to install, rationally, especially when described calibration clamp is installed, needs to use and decide torque wrench and reinforce, the identical installing force of coaxial upper use guarantees that the power sensor is in the identical force environment under original state.
The portable calibrating device for pull pressure sensor working method that present embodiment provides is as follows:
At first, the preliminary work before calibrating comprises 1. device installation and the 2. preliminary work of two parts of full scale precompressed.
1. device is installed: as shown in Figure 4, from bottom to top with lower floor 16, lower floor anchor clamps 19, proof force sensor 5, the coaxial anchor clamps 21 of sensor, installed successively by dynamometry sensor (by the dynamometry sensor between the coaxial anchor clamps 21 of upper plate anchor clamps 19 and sensor), upper plate anchor clamps 19, upper plate 17; Adjust the state that upper plate anchor clamps 19, the coaxial anchor clamps 21 of sensor are in sensor just not stress, with level governor 14 with the single unit system leveling, unidirectional quantitative hydraulic pump 1 is connected with oil circuit cross-over valve 7, opens proof force value display 6 power supplys and carry out preheating.
2. full scale precompressed:
Establishing criteria dynamometer vertification regulation is at first to being carried out two-way full scale precompressed by the dynamometry sensor; Open the switch of unidirectional quantitative hydraulic pump 1, move oil circuit cross-over valve 7 to " pressing to " position, make proof force sensor 5 and born in the same way the together pressure of value by the dynamometry sensor.In the pressure process, observation caliber power value displayed value 6 when reaching full scale, is moved oil circuit cross-over valve 7 to " stopping " position simultaneously, opens the oil return switch on the unidirectional quantitative hydraulic pump 1, at this moment, because the hydraulic pressure that throw of poston causes begins oil return; Close the oil return switch, oil circuit cross-over valve 7 moved on the position of " pulling to ", continue observation caliber power value display 6. when reach tested sensor pull to full scale the time, move the oil circuit cross-over valve to " stopping " position.
Secondly, pull to calibration process, take the pull pressure sensor of 50000N as example, comprise following four steps:
1. select calibrated channel: at first proof force value display is pulled to passage (concrete establishing method and channel number see equipment operating manual for details) be chosen for 50000N by the measurement passage of dynamometry value display, carry out the setting of range, resolution and unit.
2. choose the calibrated force value point of tested sensor according to rules, control unidirectional quantitative hydraulic pump 1 and pressurize, by the time the power value show stable after, observe and record standard power value display 6 and by the reading of dynamometry value display.The difference of two display numerical value is by the calibration error of school sensor.
3. the selection of power value point is according to from small to large order, when carrying out pick up calibration, and need to calibrating one by one smoothly according to power value point.After each survey time is finished, make calibrating installation turn back to zero point, duplicate measurements.
4. carry out the calculating of indices according to measurement result.
At last, press to calibration process: it is basic identical with pulling to calibration process operation to press to calibration process, and different is that calibrate the position that oil circuit cross-over valve 7 need to be moved to " pulling to ".
Claims (7)
1. calibrating installation that is used for aircraft evelvator control system pull pressure sensor, it is characterized in that: described device is by this 6 part formation of unidirectional quantitative hydraulic pump (1), bidirectional hydraulic control module (2), unidirectional oil return apparatus (3), calibration unit clamp (4), proof force sensor (5) and proof force value display (6); Described bidirectional hydraulic control module (2) is made of oil circuit cross-over valve (7), bidirectional hydraulic lock (8) and oil cylinder (9); Described unidirectional oil return apparatus (3) is made of oil accumulator (10), retaining valve (11) and oil return conduit (12); Described calibration unit clamp (4) is made of housing (13), level governor (14), weighing bracket (15), lower shoe (16), upper plate (17), lower shoe anchor clamps (18), upper plate anchor clamps (19), level meter (20) and the coaxial anchor clamps of sensor (21).
2. calibrating installation according to claim 1, it is characterized in that: the calibration unit clamp is the calibration clamp with " angled pin ", this angled pin is mutually vertical with weighing bracket, and its effect is that the deformation that guarantees calibration clamp does not exert an influence to the force measurement result.
3. calibrating installation according to claim 1 is characterized in that: standard transducer is connected with tested sensor " back-to-back " coaxial rigid, bears the power of equidirectional and size to guarantee standard transducer and tested sensor.
4. calibrating installation according to claim 1, it is characterized in that: described calibrating installation is applicable to the continuous loading of the bidirectional force of 100000N range.
5. calibrating installation according to claim 1, it is characterized in that: described calibrating installation calibration accuracy reaches 0.05%.
6. calibrating installation according to claim 1, it is characterized in that: described calibrating installation possesses the weight of volume and the 50KG of 26cm * 21cm * 82cm.
7. calibrating installation according to claim 1 is characterized in that: described proof force value display (6) can compatible 7 proof force sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010204961 CN101865750B (en) | 2010-06-22 | 2010-06-22 | Portable calibrating device for pull pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010204961 CN101865750B (en) | 2010-06-22 | 2010-06-22 | Portable calibrating device for pull pressure sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101865750A CN101865750A (en) | 2010-10-20 |
| CN101865750B true CN101865750B (en) | 2013-10-30 |
Family
ID=42957557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010204961 Expired - Fee Related CN101865750B (en) | 2010-06-22 | 2010-06-22 | Portable calibrating device for pull pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101865750B (en) |
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353438B (en) * | 2011-06-13 | 2013-07-03 | 中国一冶集团有限公司 | Scale calibrating device and scale calibrating method for hopper scale with hopper or hopper bin horizontal detection |
| CN102288363B (en) * | 2011-06-24 | 2012-12-12 | 常州市常欣电子衡器有限公司 | Device for calibrating force sensor of lifting capacity limiter |
| CN102539067A (en) * | 2011-12-20 | 2012-07-04 | 北京动力机械研究所 | Device and method for simulating underwater calibration of underwater thrust sensor |
| CN102564555B (en) * | 2011-12-28 | 2014-07-09 | 太原航空仪表有限公司 | Compensation device for hydraulic oil or nitrogen pressure damage of landing gear for airplane weighing |
| CN103376186A (en) * | 2012-04-16 | 2013-10-30 | 昆山市创新科技检测仪器有限公司 | Planar suspension bearing |
| CN103376187B (en) * | 2012-04-16 | 2015-06-10 | 昆山市创新科技检测仪器有限公司 | High-precision load deformation automatic compensation device |
| CN102890001B (en) * | 2012-09-21 | 2015-06-03 | 山西汾河焦煤股份有限公司回坡底煤矿 | Pneumatic landing leg type jumbolter detecting platform |
| CN102944355A (en) * | 2012-10-24 | 2013-02-27 | 连云港步升机械有限公司 | Calibration stand of tension monitoring stress hinge pin for cable disengaging hook |
| CN103148982B (en) * | 2013-02-04 | 2015-06-24 | 河南科技大学 | Calibration device of pull-press integrated sensor |
| CN104422560A (en) * | 2013-08-27 | 2015-03-18 | 北京中科泛华测控技术有限公司 | Sensor detection device |
| CN104422559A (en) * | 2013-08-27 | 2015-03-18 | 北京中科泛华测控技术有限公司 | Hydraulic force applying system |
| CN104406877A (en) * | 2014-12-04 | 2015-03-11 | 天津市计量监督检测科学研究院 | Portable force value loaded detection device |
| CN105300594A (en) * | 2015-11-12 | 2016-02-03 | 西安航空动力股份有限公司 | Calibration device and calibration method of tension sensor |
| CN105547584B (en) * | 2015-12-04 | 2019-02-15 | 中国航空工业集团公司金城南京机电液压工程研究中心 | One kind is portable to pull to force value system for field calibrating installation |
| CN108132124A (en) * | 2016-11-30 | 2018-06-08 | 北京航天计量测试技术研究所 | Zero passage continuous force calibrating device for sensors |
| CN107290102B (en) * | 2017-04-27 | 2019-05-24 | 沈阳金凯瑞科技有限公司 | A kind of integrated correction device |
| CN107255544A (en) * | 2017-06-12 | 2017-10-17 | 中国航发湖南动力机械研究所 | Load sensor calibrating device |
| CN108254124A (en) * | 2017-12-20 | 2018-07-06 | 西安航天计量测试研究所 | A kind of portable Force measure utensil field calibration device and method |
| CN108436819B (en) * | 2018-05-22 | 2024-03-12 | 苏州热工研究院有限公司 | Calibration device and calibration method for high-load bolt fastening machine tool |
| CN108692835B (en) * | 2018-06-08 | 2021-09-24 | 北京金风科创风电设备有限公司 | Calibration system |
| CN109000847A (en) * | 2018-06-28 | 2018-12-14 | 中国人民解放军国防科技大学 | Calibration method for force sensor |
| CN108801529B (en) * | 2018-07-05 | 2024-04-05 | 陈俊胤 | Real-time tension detection device and method for small unmanned aerial vehicle |
| CN111412972A (en) * | 2019-01-04 | 2020-07-14 | 梅特勒-托利多(常州)精密仪器有限公司 | Automatic pressurizer reaches hydraulic pressure calibration system including it |
| CN111458005A (en) * | 2020-06-09 | 2020-07-28 | 宁波中和衡器有限公司 | Dynamic balance standard force source based symmetric retransmission sensor field calibration device and method |
| CN114754921B (en) * | 2021-01-08 | 2023-11-17 | 广州汽车集团股份有限公司 | Force sensor checking device and force sensor checking method |
| CN114858318B (en) * | 2021-02-03 | 2024-06-25 | 中国石油天然气集团有限公司 | Wireless injection head load calibrator |
| CN112857552A (en) * | 2021-03-08 | 2021-05-28 | 苏州龙双电子科技有限公司 | Weighing sensor calibration system and weighing sensor calibration method |
| CN113252494B (en) * | 2021-03-30 | 2024-09-10 | 湘潭市计量测试检定所 | Hydraulic bolt stretcher calibration method |
| CN114264408B (en) * | 2021-12-30 | 2024-11-08 | 江西飞达电气设备有限公司 | Method for calibrating force measuring ring by using force sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3301038A (en) * | 1964-01-02 | 1967-01-31 | North American Aviation Inc | Thrust measurement calibrator |
| US4273513A (en) * | 1978-10-02 | 1981-06-16 | Ga Industries, Inc. | Pump failure protection for liquid transmission pipe lines |
| CN101419111A (en) * | 2008-12-10 | 2009-04-29 | 重庆大学 | Force sensor demarcating device |
| CN201569540U (en) * | 2009-11-27 | 2010-09-01 | 中国直升机设计研究所 | Novel torque loading calibrating device |
-
2010
- 2010-06-22 CN CN 201010204961 patent/CN101865750B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3301038A (en) * | 1964-01-02 | 1967-01-31 | North American Aviation Inc | Thrust measurement calibrator |
| US4273513A (en) * | 1978-10-02 | 1981-06-16 | Ga Industries, Inc. | Pump failure protection for liquid transmission pipe lines |
| CN101419111A (en) * | 2008-12-10 | 2009-04-29 | 重庆大学 | Force sensor demarcating device |
| CN201569540U (en) * | 2009-11-27 | 2010-09-01 | 中国直升机设计研究所 | Novel torque loading calibrating device |
Non-Patent Citations (1)
| Title |
|---|
| 毛宏宇，胡卓林，李效辉，王书士.《振动传感器动态校准的数字补偿方法研究》.《仪器仪表学报》.2009,第30卷(第10期),215-218. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101865750A (en) | 2010-10-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101865750B (en) | Portable calibrating device for pull pressure sensor | |
| CN201133859Y (en) | 2MN microcomputer controlled electrohydraulic servo-force standard machine | |
| CN100501359C (en) | Loading test bench of straight stroke electric actuating mechanism | |
| CN101571442B (en) | Calibration method for six-dimension force sensor calibration device with medium measurement range | |
| CN108120549A (en) | Volume range force sensor calibrating installation | |
| CN101226094A (en) | Standardization method for six-dimension force sensor calibration device | |
| CN104006964B (en) | Harmonic drive tooth mesh and deformation of flexible wheel dynamic characterization measurement system | |
| CN1318834C (en) | Direct shear test machine for rock | |
| CN103245458A (en) | Half-sine quasi-static calibration device of force sensor | |
| CN109115510B (en) | Six-component force test bed and error determination method thereof | |
| CN103616128A (en) | Six-dimension force sensor calibration device and loading unit thereof | |
| CN103134674B (en) | Device and method used for detection of sliding performance of matching part | |
| CN100476381C (en) | Force moment testing device of corner type electric actuating mechanism | |
| CN206339329U (en) | Volume range force sensor calibrating installation | |
| CN202002770U (en) | Force sensor calibration and comparison device for engine dynamometer | |
| RU165648U1 (en) | TEST FOR TURBO-SCREW ENGINES TEST | |
| CN2898849Y (en) | Automatic checking platform of movable gas relay | |
| CN201057518Y (en) | Synthetic testing bench for pre-stressed anchorage and connector | |
| CN204389102U (en) | Dual force source superposing type multi-dimension force sensor calibrating installation | |
| CN206348142U (en) | Double-wall pipe elastic support dynamic fatigue test device | |
| KR20120096612A (en) | Device for measuring compressive forces of governor spring | |
| CN110514523A (en) | A kind of stress loading combination unit | |
| CN201464204U (en) | Dynamic jack load pretesting system | |
| CN207850594U (en) | Steel chord type anchor ergometer calibrating installation | |
| CN208238921U (en) | A kind of double mode truck scale calibrating installation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20101020 Assignee: Air Beijing Aviation Technology Co., Ltd. Assignor: Hu Zhuolin|Mao Hongyu Contract record no.: 2014990000379 Denomination of invention: Portable calibrating device for pull pressure sensor Granted publication date: 20131030 License type: Exclusive License Record date: 20140606 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 Termination date: 20140622 |
|
| EXPY | Termination of patent right or utility model |