CN208968569U - A kind of automatic traction device for the detection of multi-step deep hole - Google Patents

A kind of automatic traction device for the detection of multi-step deep hole Download PDF

Info

Publication number
CN208968569U
CN208968569U CN201821734366.1U CN201821734366U CN208968569U CN 208968569 U CN208968569 U CN 208968569U CN 201821734366 U CN201821734366 U CN 201821734366U CN 208968569 U CN208968569 U CN 208968569U
Authority
CN
China
Prior art keywords
support tube
deep hole
rod
auxiliary support
detection
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
Application number
CN201821734366.1U
Other languages
Chinese (zh)
Inventor
章婷
冯勇
王宏睿
蒋荣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Institute of Technology
Original Assignee
Nanjing Institute of Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nanjing Institute of Technology filed Critical Nanjing Institute of Technology
Priority to CN201821734366.1U priority Critical patent/CN208968569U/en
Application granted granted Critical
Publication of CN208968569U publication Critical patent/CN208968569U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

The utility model discloses a kind of automatic traction devices for the detection of multi-step deep hole, including pre-driver mechanism, postposition driving mechanism and auxiliary support mechanism, the pre-driver mechanism to be connected through auxiliary support mechanism with postposition driving mechanism.When measurement, pre-driver mechanism, auxiliary support mechanism and postposition driving mechanism are successively placed in from inside to outside in multi-step deep hole to be measured first;Secondly, according to the measured value of the distance measuring sensor measured value and first pressure sensor and second pressure sensor of pre-driver mechanism and postposition driving mechanism, drive control pre-driver mechanism, postposition driving mechanism and auxiliary support mechanism, the draw operations between cooperative achievement multi-step deep hole different-diameter.The present apparatus uses the pre-driver mechanism, postposition driving mechanism and the auxiliary support mechanism that automatically control, it can be achieved that having the deep blind hole internal diameter of multi-step continuously to detect, and helps the precision and efficiency for guaranteeing diameter measuring in deep blind hole.

Description

A kind of automatic traction device for the detection of multi-step deep hole
Technical field
The utility model relates to a kind of automatic traction devices for the detection of multi-step deep hole, belong to deep hole detection technique neck Domain.
Background technique
As application percentage of the large-scale whole class workpiece in the products such as modern aircraft, steamer, large-scale precision instrument is continuous It improves, the detection of multi-step deep hole also frequently occurs.Since existing deep hole detection device is difficult to realize in multi-step deep hole Draw operations are severely impacted multi-step deep hole precision and efficiency of detecting, thus compel to develop some suitable for multi-step Deep hole automatic traction device.
Summary of the invention
Technical problem to be solved by the utility model is to provide a kind of automatic tractions suitable for the detection of multi-step deep hole Device.
In order to solve the above technical problems, the technical solution adopted by the utility model is:
A kind of automatic traction device for the detection of multi-step deep hole, including auxiliary support mechanism and it is symmetricly set on institute State auxiliary support mechanism two sides driving mechanism connected to it;
The driving mechanism includes the first support tube, several is located at the circumferentially upper equally distributed ranging of first support tube Sensor, several equally distributed radial direction the first back-up roller wheel component and axial movements in the first support tube circumferential direction Driving device, the first back-up roller wheel component include parallelogram connection-rod, drive rod, the first roll wheel assembly, idler wheel driving Device and first pressure sensing device, the parallelogram connection-rod is perpendicular to first support tube, wherein a vertical rod It is connect with first support tube, another vertical rod outboard end successively drives with the first pressure sensing device, the idler wheel Device and first roll wheel assembly connection, described drive rod one end are connect with the axial movement driving device, the other end It is hinged with one horizon bar of parallelogram connection-rod;
The auxiliary support mechanism include the second support tube and turntable in second support tube, fixed disk, Rotation drive device and several the second back-up roller wheel of equally distributed radial direction components are evenly distributed in the fixed disk disk The radial groove of the second back-up roller wheel component count is corresponded to, the corresponding sliding slot number is evenly distributed in the turntable disk The radial strut slot of amount, the turntable and the fixed disk are coaxially disposed, and the second back-up roller wheel component includes being mounted on The slide block assembly that the arc-shaped slot is pierced by the sliding slot, the radial strut being connect with the slide block assembly and successively position In second pressure sensing device and the second roll wheel assembly on the support rod, the rotation drive device and the turntable connect It connects.
First support tube is T shape support tube, and the distance measuring sensor is located at the thick section of T shape support tube, described the One back-up roller wheel component is located at the T shape support tube thin segment, and the T shape support tube thin segment is connect with the auxiliary support mechanism.
The axial movement driving device includes positioned at the motor at one end center and the motor in first support tube The screw rod for exporting axis connection, the translating bracket being mounted on the screw rod and the support plate positioned at the screw rod other end, it is described flat It moves bracket circumferential direction and is equipped with protrusion corresponding with the first back-up roller wheel component count, the first support tube side wall is equipped with Axial strip slot corresponding with the protrusion quantity, the protrusion can move in the strip slot, the protrusion and institute State drive rod connection.
The first back-up roller wheel component and the second back-up roller wheel component including three groups etc. points of distributions.
The distance measuring sensor including three groups etc. points of distributions.
The first pressure sensing device and the second pressure sensing device use pressure sensor.
The utility model is achieved the utility model has the advantages that driving mechanism, middle part setting auxiliary is arranged in rear and front end in the present apparatus Supporting mechanism can be adapted for the detection of step-like deep hole, to improve the efficiency and precision of step longhole survey.
Detailed description of the invention
Fig. 1 is embodiment overall structure diagram;
Fig. 2 is driving mechanism the schematic diagram of the section structure in embodiment;
Fig. 3 is auxiliary support mechanism section structural scheme of mechanism in embodiment;
Fig. 4 is mobile supporting structure schematic diagram in embodiment;
Fig. 5 is Cap structure for box-like container schematic diagram in embodiment;
Fig. 6 is embodiment turntable structural schematic diagram;
Fig. 7 is fixed disk structural schematic diagram in embodiment.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.Following embodiment is only used for clearly illustrating this The technical solution of utility model, and cannot be used as a limitation the limitation protection scope of the utility model.
As shown in Figure 1, a kind of automatic traction device for the detection of multi-step deep hole, including pre-driver mechanism 1000, Postposition driving mechanism 1000 and auxiliary support mechanism 2000.Wherein, pre-driver mechanism is consistent with postposition driving mechanism structure, right Claim to be arranged on 2000 both sides of auxiliary support mechanism and be connected thereto.
As shown in Fig. 2, being illustrated by taking preposition driving mechanism as an example.
Pre-driver mechanism body be T-type support tube 1001, the thick section of T-type support tube 1001 radially fill there are three it is uniformly distributed Distance measuring sensor 1002, three mounting heights of the uniformly distributed distance measuring sensor 1002 away from 1001 center line of T-type support tube are equal;T 1001 thin segment of type support tube is equipped with driving device 1 by bracket 1 close to one end central hole of thick section, drives One 1005 output shaft of device can be rotated across the coaxially connected screw rod 1007 of bracket 1;1007 other end of screw rod passes through translation branch Frame 1004, the support plate that is rotatably connected 1008;Support plate 1008 is fixed in 1001 thin segment centre bore of T-type support tube;Outside end Wall is equipped with the axial slide of one group of trisection, and translating bracket 1004 is mounted in axial slide by protrusion 1004-1;It is another Hold attaching cover 1;Cover 1003 is evenly distributed three groups of support base 1003-1, as shown in Figure 5;Link assembly quantity is 3 Group is evenly arranged on around T-type support tube 1001, including by draft link 1009, upper pendulum bar 1010, vertical translation bar 1011 and driving Bar 1012;Draft link 1009 is in arranged in parallel with upper pendulum bar 1010, and one end of draft link 1009 and upper pendulum bar 1010 is to rotate Pair is connected with support base 1003-1 respectively, and the other end is connected with vertical translation bar 1011 respectively with revolute pair, constitutes one parallel four Side shape connecting rod;1012 one end of drive rod is connected with revolute pair with 1004 protrusion of translating bracket, and the other end is with revolute pair and draft link 1009 middle parts are connected;Vertical translation 1011 end of bar connects wheel carrier 1;One 1013 attaching driving wheel of wheel carrier and motor 1014, And first pressure sensor (not shown) is also equipped between wheel carrier 1 and vertical translation bar 1011;Each link assembly connection The mounting height of driving wheel and motor 1014 away from 1001 center line of T-type support tube it is equal.
As shown in figure 3,2000 main body of auxiliary support mechanism is column type support cylinder 2001, the 2001 both ends attaching of column type support cylinder Cover plate 2 2013, centre bore are provided with turntable 2002 and fixed disk 2003;Turntable 2002 and fixed disk 2003 are co-axially mounted, and are turned 2002 projecting shaft 2002-2 of disk passes through rolling bearing 1, bearing (ball) cover 2005 and 2006 output shaft phase of the second driving device Even;Rolling bearing 1 is mounted in 2003 centre bore 2003-2 of fixed disk;Bearing (ball) cover 2005 respectively with rolling bearing one 2004 are connected with the end face of fixed disk 2003;Second driving device 2006 is mounted on bearing (ball) cover 2005;Outside fixed disk 2003 Round to be connected with 2001 center bore inner wall of column type support cylinder, left end face is equipped with the radial groove 2003-1 of trisection, such as Fig. 7 institute Show, 2002 disk of turntable is equipped with the radial kidney-shaped slot 2002-1 of trisection, and the kidney-shaped both ends slot 2002-1 are located at two directly Diameter is not on equal circle, and the circle size that two diameters do not wait is designed according to hereinafter 2007 radial stroke of radial slider, Mei Gejing Into sliding slot, 2003-1 is provided with radial slider 2007;Affixed 2008 one end of short axle of radial slider 2007;2008 other end of short axle Kidney-shaped slot 2002-1 is connected with pole socket 2009 on turntable 2002, and the axis of rolling is housed between short axle 2008 and turntable 2002 Hold 2 2009;2010 one end of support rod is connected along 2002 radial direction of turntable with pole socket 2009, and the other end is threadedly coupled wheel carrier two 2011;2 2011 end of wheel carrier connects directive wheel 2012, and installation of each directive wheel 2012 away from 1001 center line of T-type support tube is high Spend it is equal, and between wheel carrier 2 2011 and support rod 2010 be equipped with second pressure sensor (not shown).
A kind of automatic traction device working principle for the detection of multi-step deep hole is as follows:
1) before measuring, first according to the size and distance measuring sensor and first for being tested multi-step deep hole inlet internal diameter The driving wheel and motor 1014 of pre-driver mechanism and postposition driving mechanism is adjusted to appropriate position by the measured value of pressure sensor It sets, even if driving wheel and motor 1014 reliably press against on the inner wall of multi-step deep hole inlet;Secondly, starting the second driving dress 2006 are set, the directive wheel 2012 of auxiliary support mechanism 2000 is adjusted to retracted position along 2003 radial direction of fixed disk, even if directive wheel 2012 is contactless with multi-step deep hole inlet inner wall;Finally, pre-driver mechanism, auxiliary support mechanism 2000, postposition are driven Motivation structure is placed in multi-step deep hole inlet from the inside to the outside.
2) when measuring, according to the distance measuring sensor measured value and the first pressure of pre-driver mechanism and postposition driving mechanism The measured value of force snesor and second pressure sensor, drive control pre-driver mechanism, postposition driving mechanism and Auxiliary support Mechanism 2000, the automatic draw operations between cooperative achievement multi-step deep hole different-diameter, specific implementation step are as follows:
A) hole internal diameter equal segments
That is pre-driver mechanism and when 2002 measured value of distance measuring sensor of postposition driving mechanism equal always, starts preposition The driving wheel and motor 1014 of driving mechanism drive auxiliary support mechanism 2000 and postposition driving mechanism one in multi-step deep hole With advancing, the directive wheel 2012 of auxiliary support mechanism is in radially retracted position, i.e. directive wheel 2012 and multi-step deep hole always Inner wall does not contact;
B) hole internal diameter changes from small to big section
That is measurement of the distance measuring sensor 2002 of pre-driver mechanism greater than the distance measuring sensor 2002 of postposition driving mechanism Value, specific implementation step are as follows:
(1) the second driving device 2006 of starting makes radial slider 2007, pole socket by turntable 2002 and fixed disk 2003 2009, support rod 2010 and wheel carrier 2 2011 drive directive wheel 2012 to be moved radially outward along fixed disk 2003, make directive wheel 2012 press against on the hole inner wall of reduced diameter section, and auxiliary support mechanism 2000 enters holding state, are simultaneously stopped pre-driver machine The driving wheel and motor 1014 of structure;
(2) driving wheel and motor 1014 for starting postposition driving mechanism, push auxiliary support mechanism 2000 and pre-driver Mechanism advances in multi-step deep hole together;
(3) start pre-driver mechanism first driving device 1005, by screw rod 1007 drive translating bracket 1004 to Auxiliary support mechanism 2000 is mobile, makes link assembly and wheel carrier 1 that driving wheel and motor 1014 are pressed against position pair To hole inner wall on, pre-driver mechanism enters multi-step deep hole enlarged diameter section, is simultaneously stopped the driving wheel of postposition driving mechanism And motor 1014;
(4) the second driving device 2006 of starting makes radial slider 2007, pole socket by turntable 2002 and fixed disk 2003 2009, support rod 2010 and wheel carrier 2 2011 drive directive wheel 2012 to move radially inwardly along fixed disk 2003, make directive wheel 2012 are detached from hole inner wall corresponding to current location, and auxiliary support mechanism 2000 exits the holding state of reduced diameter section;
(5) diameter is made by turntable 2002 and fixed disk 2003 in the moment that auxiliary support mechanism 2000 enters enlarged diameter section To sliding block 2007, pole socket 2009, support rod 2010 and wheel carrier 2 2011 drive directive wheel 2012 along fixed disk 2003 radially outward It is mobile, press against directive wheel 2012 on hole inner wall corresponding to current location, auxiliary support mechanism 2000 enters enlarged diameter section Holding state;
(6) enter the moment of enlarged diameter section in postposition driving mechanism, start the first driving device of postposition driving mechanism 1005, it drives translating bracket 1004 mobile to auxiliary support mechanism 2000 by screw rod 1007, makes link assembly and wheel carrier one 1013 press against driving wheel and motor 1014 on the hole inner wall of enlarged diameter section, and it is straight greatly that postposition driving mechanism enters multi-step deep hole Diameter section, while auxiliary support mechanism 2000 releases holding state, so far completes the step deep hole traction behaviour that diameter changes from small to big Make;
C) hole internal diameter section from large to small
That is measured value of the distance measuring sensor 2002 of forerunner mechanism less than the distance measuring sensor 2002 of rear-guard mechanism, specific reality Apply that steps are as follows:
(1) the second driving device 2006 of starting makes radial slider 2007, pole socket by turntable 2002 and fixed disk 2003 2009, support rod 2010 and wheel carrier 2 2011 drive directive wheel 2012 to be moved radially outward along fixed disk 2003, make directive wheel 2012 press against on the hole inner wall of enlarged diameter section, and auxiliary support mechanism 2000 enters holding state, are simultaneously stopped pre-driver machine The driving wheel and motor 1014 of structure;
(2) driving wheel and motor 1014 for starting postposition driving mechanism, push auxiliary support mechanism 2000 and pre-driver Mechanism advances in multi-step deep hole together;
(3) start pre-driver mechanism first driving device 1005, by screw rod 1007 drive translating bracket 1004 to It is mobile far from auxiliary support mechanism 2000, make link assembly and wheel carrier 1 that driving wheel and motor 1014 are pressed against minor diameter On the hole inner wall of section, pre-driver mechanism enters multi-step deep hole reduced diameter section, is simultaneously stopped the driving wheel of postposition driving mechanism And motor 1014;
(7) the second driving device 2006 of starting makes radial slider 2007, pole socket by turntable 2002 and fixed disk 2003 2009, support rod 2010 and wheel carrier 2 2011 drive directive wheel 2012 to move radially inwardly along fixed disk 2003, make directive wheel 2012 are detached from hole inner wall corresponding to current location, and auxiliary support mechanism 2000 exits the holding state of enlarged diameter section;
(8) diameter is made by turntable 2002 and fixed disk 2003 in the moment that auxiliary support mechanism 2000 enters reduced diameter section To sliding block 2007, pole socket 2009, support rod 2010 and wheel carrier 2 2011 drive directive wheel 2012 along fixed disk 2003 radially outward It is mobile, press against directive wheel 2012 on the hole inner wall of reduced diameter section, auxiliary support mechanism 2000 enters the support of reduced diameter section State;
D) enter the moment of reduced diameter section in postposition driving mechanism, start the first driving device of postposition driving mechanism 1005, it drives translating bracket 1004 to far from the movement of auxiliary support mechanism 2000 by screw rod 1007, makes link assembly and wheel carrier One 1013 press against driving wheel and motor 1014 on the hole inner wall of reduced diameter section, and it is small that postposition driving mechanism enters multi-step deep hole Diameter segment, while auxiliary support mechanism 2000 releases holding state, so far completes the step deep hole traction of diameter from large to small Operation.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, without deviating from the technical principle of the utility model, several improvement and deformations can also be made, these change It also should be regarded as the protection scope of the utility model into deformation.

Claims (6)

1. it is a kind of for multi-step deep hole detection automatic traction device, characterized in that including auxiliary support mechanism (2000) with And it is symmetricly set on the auxiliary support mechanism (2000) two sides driving mechanism connected to it (1000);
The driving mechanism includes the first support tube (1001), several is located at that the first support tube (1001) circumferential direction is upper uniform to divide The distance measuring sensor (1002) of cloth, several radial directions first equally distributed in the first support tube (1001) circumferential direction support Roll wheel assembly and axial movement driving device, the first back-up roller wheel component includes parallelogram connection-rod, drive rod (1012), the first roll wheel assembly, roller driving device and first pressure sensing device, the parallelogram connection-rod perpendicular to First support tube (1001), wherein a vertical rod is connect with first support tube (1001), another vertical rod outboard end It is successively connect with the first pressure sensing device, the roller driving device and first roll wheel assembly, the driving Bar one end is connect with the axial movement driving device, and the other end and one horizon bar of parallelogram connection-rod are hinged;
The auxiliary support mechanism (2000) includes the second support tube (2001) and is located in second support tube (2001) Turntable (2002), fixed disk (2003), rotation drive device (2006) and several the second back-up rollers of equally distributed radial direction Wheel assembly is evenly distributed with the radial groove of the corresponding second back-up roller wheel component count in fixed disk (2003) disk (2003-1) is evenly distributed with the radial strut slot of corresponding sliding slot (2003-1) quantity in turntable (2002) disk (2002-1), the turntable (2002) and the fixed disk (2003) are coaxially disposed, and the second back-up roller wheel component includes peace The slide block assembly (2007) and the slide block assembly of the arc-shaped slot (2002-1) are pierced by the sliding slot (2003-1) (2007) radial strut (2010) connected and the second pressure sensing device being sequentially located on the support rod (2010) With the second roll wheel assembly, the rotation drive device is connect with the turntable (2002).
2. a kind of automatic traction device for the detection of multi-step deep hole according to claim 1, characterized in that described the One support tube (1001) is T shape support tube, and the distance measuring sensor (1002) is located at the thick section of T shape support tube, described first Back-up roller wheel component is located at the T shape support tube thin segment, and the T shape support tube thin segment and the auxiliary support mechanism (2000) are even It connects.
3. a kind of automatic traction device for the detection of multi-step deep hole according to claim 1, characterized in that the axis To the motor (1005), defeated with the motor that mobile drive deivce includes positioned at the interior one end center of the first support tube (1001) The screw rod (1007) of axis connection, the translating bracket (1004) that is mounted on the screw rod and the support positioned at the screw rod other end out Plate (1008), translating bracket (1004) circumferential direction are equipped with protrusion corresponding with the first back-up roller wheel component count (1004-1), the first support tube (1001) side wall are equipped with axial strip slot corresponding with protrusion (1004-1) quantity Hole, the protrusion (1004-1) can move in the strip slot, the protrusion (1004-1) and the drive rod (1012) Connection.
4. a kind of automatic traction device for the detection of multi-step deep hole according to claim 1, characterized in that including three The the first back-up roller wheel component and the second back-up roller wheel component of group etc. point distribution.
5. a kind of automatic traction device for the detection of multi-step deep hole according to claim 1, characterized in that including three The distance measuring sensor (1002) of group etc. point distribution.
6. a kind of automatic traction device for the detection of multi-step deep hole according to claim 1, characterized in that described the One pressure sensitive device and the second pressure sensing device use pressure sensor.
CN201821734366.1U 2018-10-25 2018-10-25 A kind of automatic traction device for the detection of multi-step deep hole Active CN208968569U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821734366.1U CN208968569U (en) 2018-10-25 2018-10-25 A kind of automatic traction device for the detection of multi-step deep hole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821734366.1U CN208968569U (en) 2018-10-25 2018-10-25 A kind of automatic traction device for the detection of multi-step deep hole

Publications (1)

Publication Number Publication Date
CN208968569U true CN208968569U (en) 2019-06-11

Family

ID=66761248

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201821734366.1U Active CN208968569U (en) 2018-10-25 2018-10-25 A kind of automatic traction device for the detection of multi-step deep hole

Country Status (1)

Country Link
CN (1) CN208968569U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109374030A (en) * 2018-10-25 2019-02-22 南京工程学院 A kind of automatic traction device for the detection of multi-step deep hole

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109374030A (en) * 2018-10-25 2019-02-22 南京工程学院 A kind of automatic traction device for the detection of multi-step deep hole
CN109374030B (en) * 2018-10-25 2024-05-24 南京工程学院 Automatic traction device for multi-step deep hole detection

Similar Documents

Publication Publication Date Title
US11181355B2 (en) On-line automatic detection device for wheel brake space
CN105222690B (en) Hole-bored axle from end to end coaxiality of inner hole detection means
CN109307497B (en) Automatic measuring device for rotation moment of engine crankshaft and roundness of rotating shaft
CN205014973U (en) Synchronous detection device of car symmetry plate
CN108759758A (en) A kind of engine bearing clearance detector and measurement method
CN208968569U (en) A kind of automatic traction device for the detection of multi-step deep hole
CN112815866A (en) Internal thread detector based on laser profile scanning and detection method thereof
CN109855868A (en) A kind of bearing axial rigidity dynamic testing method and test equipment
CN105180881A (en) Parallelism detection device
CN208680246U (en) A kind of full-automatic coalignment for shaft-like workpiece
CN106017396B (en) A kind of vehicle dynamic front beam measuring device
CN204373622U (en) A kind of pick-up unit of vehicle bodywork soldering cramping apparatus
CN208527703U (en) A kind of roll dynamic measuring instrument and Mannesmann piercing mill
CN204788326U (en) Depth of parallelism check out test set
CN110095064A (en) Spiral line detection device
CN206845363U (en) A kind of device for the detection of high pressure oil rail axiality
CN109373848A (en) Solar components frame mounting hole automatic detection device
CN109374030A (en) A kind of automatic traction device for the detection of multi-step deep hole
CN205027293U (en) Hole -bored axle from end to end hole axiality detection device
CN209214576U (en) A kind of equal diameter superdeep holes inside diameter measurement system based on flexible cable traction
CN215984583U (en) Inertial navigation testing device
CN206702927U (en) Balance weight manipulator pastes extrusion equipment
CN109188325A (en) High precision electro magnet test device and its method
CN112525669B (en) Resiliometer with perpendicular auxiliary function
CN212111606U (en) Executor testing arrangement and executor test cabinet

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant