CN105352715A - Separation testing method for axial force, bending moment and torque of load for a drilling tool - Google Patents
Separation testing method for axial force, bending moment and torque of load for a drilling tool Download PDFInfo
- Publication number
- CN105352715A CN105352715A CN201510825193.9A CN201510825193A CN105352715A CN 105352715 A CN105352715 A CN 105352715A CN 201510825193 A CN201510825193 A CN 201510825193A CN 105352715 A CN105352715 A CN 105352715A
- Authority
- CN
- China
- Prior art keywords
- drilling tool
- cylindrical bar
- epsiv
- strain
- axial
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0061—Force sensors associated with industrial machines or actuators
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a separation testing method for axial force, bending moment and torque of load for a drilling tool. The method comprises: selecting three points at equal intervals on the cross section of a cylinder rod with the same size to a drilling tool; respectively placing strain sensors at the three points to measure the axial strain; placing a strain sensor at other directions of any point to measure the strain of the direction; establishing a threaded rod model and a cylinder rod model in finite element simulation software so as to obtain the difference between the axial stress value of the drilling tool and the axial stress value of the cylinder rod and the shear stress ratio of the drilling tool to the cylinder rod on the same slope; and then obtaining the axial force, the bending moment and the torque of the drilling tool through calculation. Compared with the prior art, the separation testing method for axial force, bending moment and torque of load for a drilling tool takes the drilling tool as a product obtained by overlaying screw threads on the cylinder rod with the same size to the drilling tool, and can realize a separation test of the axial force, the bending moment and the torque of the composite load by measuring the axial strain at the three points and the strain of other directions from any point, and is simple, accurate and reliable.
Description
Technical field
The present invention relates to mechanical engineering field, the method for testing of particularly a kind of drilling tool load pressure bending separation.
Background technology
Drilling apparatus is widely used in the industry such as oil and geologic prospecting, building and mine coal mining, the drilling tool that in drilling process, drill bit and drilling rod form can be subject to the effect of axle pressure (being called for short " axle power "), moment of flexure and moment of torsion simultaneously, and the size of three kinds of parameters relates to the smooth degree of drilling process and the height of drilling efficiency.
Existing research method or technology mainly concentrate the compound action measuring moment of flexure and moment of torsion, axle power and moment of torsion, such as with ohmer, moment of flexure under combined deformation and moment of torsion are detected, axle power moment of torsion is measured, axle power, moment of flexure are not carried with the power of moment of torsion three coupling and are separated by this method of testing, therefore lack the method for testing that above-mentioned three mechanics parameters of drilling rod under a kind of actual condition are separated.
Summary of the invention
The technical matters that the present invention solves is: overcome the deficiencies in the prior art, provides a kind of method of testing that axial strain realizes combined load situation lower shaft power with the strain on other direction at any point place, moment of flexure is separated with the drilling tool load pressure bending of moment of torsion discrete testing being positioned at 3, same interface place by measuring drilling rod lateral surface.
Technical solution of the present invention is: the method for testing that a kind of drilling tool load pressure bending is separated, and comprises the steps:
(1) with drilling tool with the cylindrical bar xsect of size and side hand over A, B and C of circumferentially getting and equidistantly distributing at 3, A, B and C place strain transducer 1, strain transducer 2, strain transducer 3 respectively, are that a strain transducer 4 is placed at γ Angle Position place in A side, some place and with axis;
(2) use strain transducer 1, strain transducer 2, strain transducer 3 correspondence to measure the axial strain at A, B, C 3 place respectively, and be designated as ε respectively
a, ε
b, ε
c, use strain transducer 4 is measured A side, some place and is the strain stress of γ angular direction with axis
γ;
(3) in finite element emulation software, drilling tool length is inputted, external diameter, internal diameter, screw wing height, width, pitch, head number, set up threaded rod model, then input material, material characteristic parameter, load, the way of restraint, obtain drilling tool side any point axial stress, input and the cylindrical bar length of drilling tool with size in finite element emulation software, external diameter, internal diameter, set up cylindrical bar model, then input material, material characteristic parameter, load and the way of restraint, obtain the axial stress with any point position, drilling tool side identical point on cylindrical bar side, and two axial stresses are done the difference DELTA that difference obtains drilling tool axial tension stress and cylindrical bar axial tension stress,
(4) to finite element emulation software input drilling tool length, external diameter, internal diameter, screw wing height, width, pitch, head number, set up threaded rod model, then input material, material characteristic parameter, load, the way of restraint, draw the shear Stress Distribution of drilling tool, to finite element emulation software input and the cylindrical bar length of drilling tool with size, external diameter, internal diameter, set up cylindrical bar model, then input material, material characteristic parameter, load, the way of restraint, obtain the shear Stress Distribution of cylindrical bar, and then obtain drilling tool and the shearing stress axially in side, γ angular direction, cylindrical bar and the shearing stress ratio k axially in side, γ angular direction,
(5) the axle power F of drilling tool is calculated
nfor
Moment M is
Torque T is
Wherein, S is and the cylindrical bar xsect of drilling tool with size, and E is the Young's modulus of elasticity of drilling tool material, and R is and the cylindrical bar cross sectional radius of drilling tool with size, I
zfor with the moment of inertia of drilling tool with the cylindrical bar of size, sin (2 γ)=a, μ are the Poisson ratio of drilling tool material, cos (2 γ)=b.
Be ANSYS in described finite element emulation software.
Described material characteristic parameter comprises density, elastic modulus, Poisson ratio, yield strength.
The present invention's advantage is compared with prior art:
(1) the present invention is positioned at the strain on the axial strain at 3, same interface place and other direction at any point place by measurement drilling rod lateral surface, just can realize the discrete testing of the axle power of combined load, moment of flexure and moment of torsion, solve axle power, the power of moment of flexure and moment of torsion three coupling carry separation problem, have method simply, advantage accurately and reliably;
(2) the present invention to be carried with the power of moment of torsion three coupling by axle power, moment of flexure and is separated, solve the problem of drilling tool complex load decoupling zero test in Practical Project, range of application comprises the structures such as cylinder drilling rod, pipe drilling rod, screw thread column drilling rod, threaded tubular drilling rod, and having can the advantage of on-line real-time measuremen;
(3) the present invention compared with prior art, drilling tool is superposed the product after screw thread as with drilling tool with the cylindrical bar of size, obtain drilling tool, the axial stress of cylindrical bar, shear strain distribution correction by simulation software, and then obtain drilling tool axle power, moment of flexure and moment of torsion solution.
Accompanying drawing explanation
Fig. 1 is cylindrical bar force diagram in the method for testing of a kind of drilling tool load pressure of the present invention bending separation;
Fig. 2 is sensing station force diagram in the method for testing that is separated of a kind of drilling tool load pressure of the present invention bending, and sensor 1, sensor 2, sensor 3 are used for surveying drilling rod axial strain, and sensor 4 is used for surveying the strain with sensor 3 one-tenth γ angular direction.
Embodiment
The present invention is directed to the deficiencies in the prior art, propose a kind of based on the method for strain monitoring realization to drilling tool axle power, moment of flexure and moment of torsion discrete testing, by to same size cylindrical bar strain monitoring, realize the separation of its combined load mechanics parameter, then correction is obtained by emulation, and then the separation realized screw rod mechanics parameter, below in conjunction with accompanying drawing, the inventive method is described in detail.
One, the separation of cylindrical bar mechanics parameter
As shown in Figure 1, with drilling apparatus with the cylindrical bar xsect of size and side hand over A, B and C of circumferentially getting and equidistantly distributing at 3, the center of circle is O, invention introduces 4 strain transducers as shown in Figure 2, wherein three (strain transducer 1, strain transducer 2, strain transducer 3) is affixed on A, B, C 3 point respectively vertically, remembers that 3 axial stresses are respectively σ
Α, σ
Β, σ
c, a strain transducer 4 is pasted, then the axle power F suffered by cylindrical bar with axial in γ angular direction in any point (as the A point) side, place in A, B, C are 3
nbe respectively with moment M
Wherein, R, S=π R
2and I
z=π R
4/ 4 section radius being respectively cylindrical bar, sectional area and moment of inertia, the central angle of note AO and moment of flexure couple application point line to be measured is α, then
The strain transducer detected object that A, B, C 3 place axially places is strain, and A, B, C 3 point, remembers that 3 axial strains are respectively ε
a, ε
b, ε
c, the Young's modulus of elasticity of drilling tool material is E, utilizes the relation of stress and strain can obtain the stress value of this position, is respectively
σ
A=Eε
A(4)
σ
B=Eε
B(5)
σ
C=Eε
C(6)
Recycling formula (1) and formula (2), just separable go out the axle power F of cylindrical bar
nand moment M.
Meanwhile, the stress of 3 also can use axle power F
nrepresent with moment M:
Note shearing stress is τ, then the torque T being applied to cylindrical bar is
T=τ·W
ρ(10)
Wherein, W
ρfor Torsion Section coefficient.
Under pure torsion effect, the shearing stress τ of cylindrical bar is directly proportional to shear strain, and its ratio is shear modulus, but under Action of Combined Loads, the relation of shearing stress τ and shear strain meets generalized Hooke law.
Any point (as A point) side, place in A, B, C are 3 pastes a strain transducer with axial in γ angular direction, and the strain recorded is ε
γ, the Young's modulus of elasticity of note drilling tool material is E, and Poisson ratio is μ, shearing stress
Note sin (2 γ)=a, cos (2 γ)=b, cylindrical bar Torsion Section coefficient W
ρ=π R
3/ 2, this pattern (10) becomes
To sum up, by same position both direction strain detecting, the moment of torsion of this position of cylindrical bar can be determined.
(1), (2) and (3) formula shows, measure the strain of 3 A, B, C place axial strains and any point (as: A point) any γ angular direction, drilling rod side, place that same cross section and bar side circumferential boundary lines equidistantly distribute, the separation of cylindrical bar at Action of Combined Loads lower shaft power, moment of flexure and moment of torsion can be realized.
Two, the separation of threaded drillpipe mechanics parameter
General drilling tool is external thread structure, considers screw rod complex structure, is difficult to provide the analytic expression accurately describing the distribution of its mechanics parameter, therefore, measures the strain value of limited Nodes, directly cannot provide the value of drilling tool axle power, moment of flexure and moment of torsion.
Consider that threaded rod is the product that cylindrical bar is superimposed with screw thread, on the basis of cylindrical bar mechanics parameter expression formula, by revising the approximate analytic solution that can obtain axle power, moment of flexure and moment of torsion on external spiral drilling rod.
On cylindrical bar basis, after considering screw thread, A, B, C 3 axial stresses need introduce correction amount, with former stress σ
a, σ
b, σ
csuperimposed, note three is respectively σ '
a, σ '
b, σ '
c, obtained by (7), (8) and (9) formula
The axle power of threaded drillpipe, moment of torsion and moment of flexure are respectively
Wherein, correction amount depends on helicitic texture and material, also relevant with α, asks the difference between threaded rod axial tension stress and cylindrical bar axial stress theoretical value, can obtain Δ by emulation.Equally, emulate the shear Stress Distribution of spiral drill pipe, trying to achieve with axis is the stress of side, γ angular direction and the ratio k of the equidirectional shearing stress τ theoretical value of same size cylindrical bar, (10) formula is modified to
Visible, measure 3 A, B, C place axial strains that the same cross section of threaded drillpipe and bar sideline equidistantly distribute, utilization (15) and (16) separable go out axle power in combined load and moment of flexure; In conjunction with the strain of any point (as: A point) any γ angular direction, drilling rod side, place, utilize (17) formula, separable go out moment of torsion.For hollow drilling tool, in (15) and (16) formula, give corresponding sectional area and moment of inertia, give corresponding Torsion Section coefficient in (17) formula, the separation of combined load can be realized equally.When changing drilling tool structure, the thought that above-mentioned load is separated is applicable equally, and just correction amount and k have difference.
In finite element emulation software, (such as ANSYS) inputs threaded rod length, external diameter, internal diameter, screw wing height, width, pitch, head number, set up threaded rod model, input cylindrical bar length, external diameter, internal diameter, set up cylindrical bar model, input material (such as 45 steel), material characteristic parameter (comprises density, elastic modulus, Poisson ratio, yield strength), (such as bar two ends freely-supported is fixed for load and the way of restraint, front end applies 20Nm moment of torsion and 600N axial force), draw the stress result of threaded rod and cylindrical bar identical point, then the poor difference DELTA obtained between threaded rod axial tension stress and cylindrical bar axial stress theoretical value is done to the two.Equally, to finite element emulation software input threaded rod length, external diameter, internal diameter, screw wing height, width, pitch, head number, set up threaded rod model, input cylindrical bar length, external diameter, internal diameter, set up cylindrical bar model, input material (such as 45 steel), material characteristic parameter (comprises density, elastic modulus, Poisson ratio, yield strength), (such as bar two ends freely-supported is fixed for load and the way of restraint, front end applies 20Nm moment of torsion and 600N axial force), draw the shear Stress Distribution to spiral drill pipe, try to achieve threaded rod and the shearing stress axially in side, γ angular direction and the equidirectional shearing stress ratio k of same size cylindrical bar.
The content be not described in detail in instructions of the present invention belongs to the known technology of those skilled in the art.
Claims (3)
1. a method of testing for drilling tool load pressure bending separation, is characterized in that comprising the steps:
(1) with drilling tool with the cylindrical bar xsect of size and side hand over A, B and C of circumferentially getting and equidistantly distributing at 3, A, B and C place strain transducer 1, strain transducer 2, strain transducer 3 respectively, are that a strain transducer 4 is placed at γ Angle Position place in A side, some place and with axis;
(2) use strain transducer 1, strain transducer 2, strain transducer 3 correspondence to measure the axial strain at A, B, C 3 place respectively, and be designated as ε respectively
a, ε
b, ε
c, use strain transducer 4 is measured A side, some place and is the strain stress of γ angular direction with axis
γ;
(3) in finite element emulation software, drilling tool length is inputted, external diameter, internal diameter, screw wing height, width, pitch, head number, set up threaded rod model, then input material, material characteristic parameter, load, the way of restraint, obtain drilling tool side any point axial stress, input and the cylindrical bar length of drilling tool with size in finite element emulation software, external diameter, internal diameter, set up cylindrical bar model, then input material, material characteristic parameter, load and the way of restraint, obtain the axial stress with any point position, drilling tool side identical point on cylindrical bar side, and two axial stresses are done the difference DELTA that difference obtains drilling tool axial tension stress and cylindrical bar axial tension stress,
(4) to finite element emulation software input drilling tool length, external diameter, internal diameter, screw wing height, width, pitch, head number, set up threaded rod model, then input material, material characteristic parameter, load, the way of restraint, draw the shear Stress Distribution of drilling tool, to finite element emulation software input and the cylindrical bar length of drilling tool with size, external diameter, internal diameter, set up cylindrical bar model, then input material, material characteristic parameter, load, the way of restraint, obtain the shear Stress Distribution of cylindrical bar, and then obtain drilling tool and the shearing stress axially in side, γ angular direction, cylindrical bar and the shearing stress ratio k axially in side, γ angular direction,
(5) the axle power F of drilling tool is calculated
nfor
Moment M is
Torque T is
Wherein, S is and the cylindrical bar xsect of drilling tool with size, and E is the Young's modulus of elasticity of drilling tool material, and R is and the cylindrical bar cross sectional radius of drilling tool with size, I
zfor with the moment of inertia of drilling tool with the cylindrical bar of size, sin (2 γ)=a, μ are the Poisson ratio of drilling tool material, cos (2 γ)=b.
2. the method for testing of a kind of drilling tool load pressure bending separation according to claim 1, is characterized in that: be ANSYS in described finite element emulation software.
3. the method for testing of a kind of drilling tool load pressure bending separation according to claim 1, is characterized in that: described material characteristic parameter comprises density, elastic modulus, Poisson ratio, yield strength.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201510825193.9A CN105352715B (en) | 2015-11-24 | 2015-11-24 | A kind of method of testing of drilling tool load pressure bending separation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201510825193.9A CN105352715B (en) | 2015-11-24 | 2015-11-24 | A kind of method of testing of drilling tool load pressure bending separation |
Publications (2)
Publication Number | Publication Date |
---|---|
CN105352715A true CN105352715A (en) | 2016-02-24 |
CN105352715B CN105352715B (en) | 2017-12-22 |
Family
ID=55328722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201510825193.9A Active CN105352715B (en) | 2015-11-24 | 2015-11-24 | A kind of method of testing of drilling tool load pressure bending separation |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN105352715B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106644566A (en) * | 2016-12-01 | 2017-05-10 | 北京卫星制造厂 | Unmanned independent self-adapting drilling method orienting complicated moon surface work conditions |
CN109870259A (en) * | 2019-02-14 | 2019-06-11 | 五邑大学 | Equivalent shear stress measurement device between shield screw conveyor and modified dregs |
CN116659834A (en) * | 2023-05-24 | 2023-08-29 | 广东鼎泰高科技术股份有限公司 | Apparatus and method for evaluating drill performance |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5044204A (en) * | 1990-07-09 | 1991-09-03 | Teledyne Industries, Inc. | Device with strain gaged threaded portion |
CN1940514A (en) * | 2005-09-30 | 2007-04-04 | 比亚迪股份有限公司 | Force-measuring sensing method |
CN101506624A (en) * | 2006-01-20 | 2009-08-12 | 埃克森美孚上游研究公司 | Method and system for evaluating groups of threaded connections |
CN102175357A (en) * | 2011-03-09 | 2011-09-07 | 上海交通大学 | Method for directly measuring bearing force based on structure micro-strain |
CN102332047A (en) * | 2011-10-09 | 2012-01-25 | 西安交通大学 | Bolt finite element parametric modeling method capable of realizing hexahedron grid division |
CN102410011A (en) * | 2011-08-18 | 2012-04-11 | 上海大学 | Method for evaluating performance of drill pipe connector |
CN103954494A (en) * | 2014-05-12 | 2014-07-30 | 暨南大学 | Mechanical performance testing method of oblique-coil springs |
US20140251688A1 (en) * | 2010-02-01 | 2014-09-11 | Aps Technology, Inc. | System and method for monitoring and controlling underground drilling |
CN104156498A (en) * | 2014-05-26 | 2014-11-19 | 北京宇航系统工程研究所 | Finite element method and strength evaluation method for bolt |
-
2015
- 2015-11-24 CN CN201510825193.9A patent/CN105352715B/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5044204A (en) * | 1990-07-09 | 1991-09-03 | Teledyne Industries, Inc. | Device with strain gaged threaded portion |
CN1940514A (en) * | 2005-09-30 | 2007-04-04 | 比亚迪股份有限公司 | Force-measuring sensing method |
CN101506624A (en) * | 2006-01-20 | 2009-08-12 | 埃克森美孚上游研究公司 | Method and system for evaluating groups of threaded connections |
US20140251688A1 (en) * | 2010-02-01 | 2014-09-11 | Aps Technology, Inc. | System and method for monitoring and controlling underground drilling |
CN102175357A (en) * | 2011-03-09 | 2011-09-07 | 上海交通大学 | Method for directly measuring bearing force based on structure micro-strain |
CN102410011A (en) * | 2011-08-18 | 2012-04-11 | 上海大学 | Method for evaluating performance of drill pipe connector |
CN102332047A (en) * | 2011-10-09 | 2012-01-25 | 西安交通大学 | Bolt finite element parametric modeling method capable of realizing hexahedron grid division |
CN103954494A (en) * | 2014-05-12 | 2014-07-30 | 暨南大学 | Mechanical performance testing method of oblique-coil springs |
CN104156498A (en) * | 2014-05-26 | 2014-11-19 | 北京宇航系统工程研究所 | Finite element method and strength evaluation method for bolt |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106644566A (en) * | 2016-12-01 | 2017-05-10 | 北京卫星制造厂 | Unmanned independent self-adapting drilling method orienting complicated moon surface work conditions |
CN106644566B (en) * | 2016-12-01 | 2019-04-09 | 北京卫星制造厂 | A kind of unmanned autonomically adaptive drilling method towards complicated lunar surface operating condition |
CN109870259A (en) * | 2019-02-14 | 2019-06-11 | 五邑大学 | Equivalent shear stress measurement device between shield screw conveyor and modified dregs |
CN116659834A (en) * | 2023-05-24 | 2023-08-29 | 广东鼎泰高科技术股份有限公司 | Apparatus and method for evaluating drill performance |
CN116659834B (en) * | 2023-05-24 | 2023-12-08 | 广东鼎泰高科技术股份有限公司 | Apparatus and method for evaluating drill performance |
Also Published As
Publication number | Publication date |
---|---|
CN105352715B (en) | 2017-12-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN107630711B (en) | A kind of monitoring device and method of roadway surrounding rock stress and displacement | |
CN104457681B (en) | Girder structure dynamic deflection monitoring method based on strain mode | |
CN103712790B (en) | A kind of experimental facilities studying drilling string dynamics characteristic | |
CN101819111B (en) | Method for testing tensile modulus of brittle material | |
US9963852B2 (en) | Test method for friction resistance at inner and outer sidewalls of pipe pile | |
CN103217278A (en) | Device and method for testing normal static characteristics of junction surface of high-strength bolt | |
CN102607965B (en) | Double-cross detector and testing method for testing shearing strength values of soil mass in situ | |
CN110424950B (en) | Strain gauge arrangement mode of measurement while drilling device and bridging method of electric bridge | |
CN105352715A (en) | Separation testing method for axial force, bending moment and torque of load for a drilling tool | |
CN105040985B (en) | The detecting system and method for stretching force under a kind of vertical finish rolling deformed bar anchor | |
CN107882011B (en) | miniature probe with temperature compensation function | |
CN103837279A (en) | Prestress anchoring structure tensioning force detecting system based on single-freedom-degree system | |
CN104034453B (en) | Concrete-bridge single shaft original position storage stress detection method based on substep jumping through rings | |
CN106524988A (en) | Three-dimensional strain rosette apparatus based on octahedron and test method | |
CN103644986B (en) | A kind of rock pressure [in mine measurement mechanism based on hollow grouting anchor structure | |
CN104296980A (en) | Device and method for testing normal static stiffness characteristics of joint surfaces of shim plate, foundation and foundation bolt of heavy-duty machine tool | |
CN206627375U (en) | Pipeline rigidity automatic testing equipment | |
CN108181038A (en) | Torque-indicating wrench and its torque measuring method | |
CN106441651A (en) | Measuring device for pressure of railway vehicle | |
CN206037977U (en) | Fracture width changes dynamic monitoring device based on response of meeting an emergency | |
CN206656854U (en) | One kind is used for laboratory drag-line gear type tensioning vibration detecting device | |
CN102519637B (en) | Force determining support for structural test | |
CN206709778U (en) | Consider the strain detection testing device that temperature influences | |
CN204730964U (en) | A kind of high sensitivity strain gauge | |
CN105370220A (en) | Underground multiparameter measuring short joint |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |