CN107378470B - Axis alignment device for large cylindrical workpiece - Google Patents

Axis alignment device for large cylindrical workpiece Download PDF

Info

Publication number
CN107378470B
CN107378470B CN201710590452.3A CN201710590452A CN107378470B CN 107378470 B CN107378470 B CN 107378470B CN 201710590452 A CN201710590452 A CN 201710590452A CN 107378470 B CN107378470 B CN 107378470B
Authority
CN
China
Prior art keywords
feeding mechanism
servo motor
guide rail
screw
rolling guide
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
CN201710590452.3A
Other languages
Chinese (zh)
Other versions
CN107378470A (en
Inventor
张元敏
李耀辉
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.)
Xuchang University
Original Assignee
Xuchang University
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 Xuchang University filed Critical Xuchang University
Priority to CN201710590452.3A priority Critical patent/CN107378470B/en
Publication of CN107378470A publication Critical patent/CN107378470A/en
Application granted granted Critical
Publication of CN107378470B publication Critical patent/CN107378470B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/10Aligning parts to be fitted together
    • B23P19/12Alignment of parts for insertion into bores

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Automatic Assembly (AREA)

Abstract

The invention discloses an axis alignment device of a large cylindrical workpiece, which comprises a front alignment mechanism, a rear alignment mechanism and an adjusting bracket, wherein two ends of the adjusting bracket are respectively fixed above the front alignment mechanism and the rear alignment mechanism; the front alignment mechanism is a first horizontal feeding mechanism, and the first horizontal feeding mechanism comprises a first servo motor, a first rolling guide rail, a first screw feeding mechanism, a first spring support and a first ball support; the output shaft of the first servo motor is connected with a first screw feeding mechanism, the first screw feeding mechanism is connected with a sliding seat of a first rolling guide rail, a first spring support and a first ball support are fixed on the sliding seat of the first rolling guide rail, and one end of an adjusting bracket is fixed on the first spring support; the invention simplifies the assembly process, improves the production efficiency, reduces the production cost, improves the assembly precision, improves the labor condition of workers and has good market application value.

Description

Axis alignment device for large cylindrical workpiece
Technical Field
The invention relates to a workpiece alignment device, in particular to an axis alignment device for a large cylindrical workpiece.
Background
There are many large cylindrical workpieces in factories, such as large drive shafts. The cylindrical workpieces are aligned with the cylindrical holes in the assembly process, the assembly of the large cylindrical workpieces at the present stage is carried out manually, and the prior large cylindrical assembly has the following technical problems:
(1) The whole process adopts manual operation, so that the assembly efficiency is very low;
(2) The assembly accuracy is controlled by the experience of an operator to a great extent, and the assembly accuracy has great uncertainty;
(3) The large cylindrical workpiece is manually aligned and assembled, so that the labor intensity of workers is high.
The prior art has defects and needs improvement.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides an axis alignment device for a large cylindrical workpiece.
The invention provides a technical proposal, which relates to an axis alignment device of a large cylindrical workpiece, comprising a front alignment mechanism, a rear alignment mechanism and an adjusting bracket, wherein two ends of the adjusting bracket are respectively fixed above the front alignment mechanism and the rear alignment mechanism; the front alignment mechanism is a first horizontal feeding mechanism, and the first horizontal feeding mechanism comprises a first servo motor, a first rolling guide rail, a first screw feeding mechanism, a first spring support and a first ball support; the output shaft of the first servo motor is connected with a first screw feeding mechanism, the first screw feeding mechanism is connected with a sliding seat of a first rolling guide rail, a first spring support and a first ball support are fixed on the sliding seat of the first rolling guide rail, the number of the first spring supports is two, the two first spring supports are respectively arranged on two sides of the first ball support, one end of an adjusting bracket is fixed on the first spring support, and a large cylinder workpiece is placed on the adjusting bracket; the rear alignment mechanism comprises a second horizontal feeding mechanism and a vertical feeding mechanism, and the second horizontal feeding mechanism comprises a second servo motor, a second rolling guide rail, a second spiral feeding mechanism, a second spring support and a second ball support; the output shaft of the second servo motor is connected with the second screw feeding mechanism, the second screw feeding mechanism is connected with the sliding seat of the second rolling guide rail, the vertical feeding mechanism and the second spring support are fixed on the sliding seat of the second rolling guide rail, the second ball support is fixed on the vertical feeding mechanism, the number of the second spring supports is two, the two second ball supports are respectively arranged on two sides of the vertical feeding mechanism, and the other end of the adjusting support is fixed on the second spring support.
Preferably, the vertical feeding mechanism comprises a third servo motor, a horizontal plate, guide posts and a screw rod, wherein the guide posts are arranged in a plurality, the guide posts are vertically fixed on a sliding seat of the second rolling guide rail, the horizontal plate is movably fixed on the guide posts through linear motion bearings, a third screw hole is formed in the horizontal plate and used for passing through the third screw rod, one end of the third screw rod is connected with the third servo motor, and the third servo motor drives the horizontal plate to move up and down along the guide posts through the third screw rod.
Preferably, the first screw feeding mechanism comprises a first flange plate and a first screw rod, a bearing is arranged in the first flange plate, one end of the first screw rod is sleeved in the bearing, an output shaft of the first servo motor is connected with the first screw rod, a clamping block is arranged below a sliding seat of the first rolling guide rail, a screw hole is formed in the clamping block, the first screw rod penetrates through the screw hole, and the first servo motor pushes the sliding seat of the first rolling guide rail to slide on the first rolling guide rail through the first screw rod.
Preferably, the fixing position of the large cylindrical workpiece placed by the adjusting bracket is set to be arc-shaped, the arc-shaped is 1/4 circle, the bottom end of the adjusting bracket is provided with a strip-shaped groove, the strip-shaped groove is used for supporting the ball through a first ball, and the ball supported by the first ball and the ball supported by the second ball are both convex on the inner wall of the adjusting bracket.
Preferably, the first spring support and the second spring support are both composed of a spring and a hydraulic rod, the spring is sleeved on the hydraulic rod, two ends of the hydraulic rod are connected with two ends of the spring through metal sheets, the metal sheet at one end of the hydraulic rod is welded on the bottom surface of the adjusting support, and the metal sheet at the other end of the hydraulic rod is welded on the upper surface of the sliding seat.
Compared with the prior art, the axial alignment device for the large cylindrical workpiece has the advantages that the axial alignment of the large cylindrical workpiece is realized through the front alignment mechanism and the rear alignment mechanism, and compared with the manual operation, the axial alignment device for the large cylindrical workpiece has the advantages that the accuracy of the axial alignment is controlled through the servo motor, the assembly process is simplified, the production efficiency is improved, the production cost is reduced, the uncertainty of manual assembly is eliminated, the assembly accuracy is improved, the labor condition of workers is improved, and the market application value is good.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic view of a front-end alignment mechanism according to the present invention;
FIG. 3 is a schematic view of a post alignment mechanism according to the present invention.
Detailed Description
The above-described features are continuously combined with each other to form various embodiments not listed above, and are regarded as the scope of the present invention described in the specification; and, it will be apparent to those skilled in the art from this disclosure that modifications and variations can be made without departing from the scope of the invention defined in the appended claims.
In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, the axis alignment device for the large cylindrical workpiece comprises a front alignment mechanism, a rear alignment mechanism and an adjusting bracket 101, wherein two ends of the adjusting bracket 101 are respectively fixed above the front alignment mechanism and the rear alignment mechanism; the front alignment mechanism is a first horizontal feeding mechanism, and the first horizontal feeding mechanism comprises a first servo motor 102, a first rolling guide rail 103, a first screw feeding mechanism 104, a first spring support 105 and a first ball support 106; the output shaft of the first servo motor 102 is connected with a first screw feeding mechanism 104, the first screw feeding mechanism 104 is connected with a sliding seat of a first rolling guide rail 103, a first spring support 105 and a first ball support 106 are fixed on the sliding seat of the first rolling guide rail 103, two first spring supports 105 are arranged and are respectively arranged on two sides of the first ball support 106, one end of an adjusting bracket 101 is fixed on the first spring support 105, and a large cylinder workpiece 100 is placed on the adjusting bracket 101; the rear alignment mechanism includes a second horizontal feed mechanism including a second servo motor 110, a second rolling rail 109, a second screw feed mechanism 111, a second spring support 112, and a second ball support 113, and a vertical feed mechanism 108; the output shaft of the second servo motor 110 is connected with a second screw feeding mechanism 111, the second screw feeding mechanism 111 is connected with a sliding seat of a second rolling guide rail 109, a vertical feeding mechanism 108 and a second spring support 112 are fixed on the sliding seat of the second rolling guide rail 109, a second ball support 113 is fixed on the vertical feeding mechanism 108, two second spring supports 112 are arranged and are respectively arranged on two sides of the vertical feeding mechanism 108, and the other end of the adjusting support 101 is fixed on the second spring support 112.
Preferably, the vertical feeding mechanism 108 includes a third servo motor, a horizontal plate, guide posts and a screw, the guide posts are plural, the guide posts are all vertically fixed on the slide base of the second rolling guide 109, the horizontal plate is movably fixed on the guide posts through a linear motion bearing, a third screw hole is formed on the horizontal plate and is used for passing through the third screw, one end of the third screw is connected with the third servo motor, and the third servo motor drives the horizontal plate to move up and down along the guide posts through the third screw.
Preferably, the first screw feeding mechanism 104 includes a first flange and a first screw, a bearing is disposed in the first flange, one end of the first screw is sleeved in the bearing, an output shaft of the first servo motor 102 is connected with the first screw, a fixture block is disposed below a sliding seat of the first rolling guide 103, a screw hole is disposed on the fixture block, the first screw penetrates through the screw hole, and the first servo motor 102 pushes the sliding seat of the first rolling guide 103 to slide on the first rolling guide 103 through the first screw.
Preferably, the fixing position of the large cylindrical workpiece 100 placed by the adjusting bracket 101 is set to be arc, the arc is 1/4 circle, the bottom end of the adjusting bracket 101 is provided with a bar-shaped groove, and the bar-shaped groove is used for passing through the first ball support 106 and the second ball support 113, and the rolling balls of the first ball support 106 and the second ball support 113 are both convex on the inner wall of the adjusting bracket 101.
Preferably, the first spring support 105 and the second spring support 112 are both composed of a spring and a hydraulic rod, the spring is sleeved on the hydraulic rod, two ends of the hydraulic rod are connected with two ends of the spring through metal sheets, the metal sheet at one end of the hydraulic rod is welded on the bottom surface of the adjusting bracket 101, and the metal sheet at the other end of the hydraulic rod is welded on the upper surface of the sliding seat.
Further, encoders are respectively arranged in the first servo motor 102, the second servo motor 110 and the third servo motor, the encoders are also connected with a wireless unit, the wireless unit is connected with a handheld terminal in a wireless communication mode, a wireless module is arranged in the handheld terminal, the wireless module and the wireless unit communicate through a Zigbee protocol, and a plurality of keys are arranged on the handheld terminal to control the servo motors; further, a processor is arranged in the handheld terminal, the wireless module is connected with the processor, the key is connected with the processor, and the processor is an STC89C52 singlechip; preferably, a touch screen is embedded in the handheld terminal, and the touch screen is connected with the processor.
The working principle of the invention is as follows: placing the large cylindrical workpiece 100 on the adjusting bracket 101, wherein the arc shape on the adjusting bracket 101, the rolling ball of the first ball support 106 and the rolling ball of the second ball support 113 mutually support the large cylindrical workpiece 100; the first servo motor 102 of the first horizontal feeding mechanism drives the first screw to rotate, the first screw drives the sliding seat of the first rolling guide rail 103 to horizontally move on the first rolling guide rail 103 through the screw hole, and then drives the front end of the large cylinder workpiece 100 on the mobilizing support fixed on the sliding seat to horizontally move, so that the axis of the cylinder is aligned with the center point of the cylinder cavity, the first spring support 105 and the second spring support 112 can well share the gravity of the large cylinder workpiece 100, the large cylinder workpiece 100 is prevented from sinking due to uneven stress, after the center position of the front axis is aligned, the first servo motor 102 is locked through the handheld terminal, and then the adjustment of the rear alignment mechanism is performed; the adjustment principle of the rear alignment mechanism is similar to that of the front alignment mechanism, except that the rear alignment mechanism has an up-down adjustment function, and can horizontally place the axis of the large cylindrical workpiece 100. Under the condition that the front alignment mechanism is locked, the rear alignment mechanism is adjusted, the second horizontal feeding mechanism is adjusted first, the axis of the large cylindrical workpiece 100 is located in the same vertical plane with the axis of the cylindrical cavity to be aligned, and then the vertical feeding mechanism 108 is used for adjusting up and down, so that the axis of the large cylindrical workpiece 100 is horizontally placed, and finally the alignment with the axis of the cylindrical cavity is achieved. The second horizontal feeding mechanism is balanced by the second ball support 113 to distribute the stress generated in the adjusting process so as to avoid the clamping phenomenon in the adjusting process, and meanwhile, the second spring supports 112 on two sides provide a certain supporting force so as to avoid overlarge resistance in the adjusting process.
The above-described features are continuously combined with each other to form various embodiments not listed above, and are regarded as the scope of the present invention described in the specification; and, it will be apparent to those skilled in the art from this disclosure that modifications and variations can be made without departing from the scope of the invention defined in the appended claims.

Claims (3)

1. The axis alignment device for the large cylindrical workpiece is characterized by comprising a front alignment mechanism, a rear alignment mechanism and an adjusting bracket, wherein two ends of the adjusting bracket are respectively fixed above the front alignment mechanism and the rear alignment mechanism; the front alignment mechanism is a first horizontal feeding mechanism, and the first horizontal feeding mechanism comprises a first servo motor, a first rolling guide rail, a first screw feeding mechanism, a first spring support and a first ball support; the output shaft of the first servo motor is connected with a first screw feeding mechanism, the first screw feeding mechanism is connected with a sliding seat of a first rolling guide rail, a first spring support and a first ball support are fixed on the sliding seat of the first rolling guide rail, the number of the first spring supports is two, the two first spring supports are respectively arranged on two sides of the first ball support, one end of an adjusting bracket is fixed on the first spring support, and a large cylinder workpiece is placed on the adjusting bracket;
the rear alignment mechanism comprises a second horizontal feeding mechanism and a vertical feeding mechanism, and the second horizontal feeding mechanism comprises a second servo motor, a second rolling guide rail, a second spiral feeding mechanism, a second spring support and a second ball support; the output shaft of the second servo motor is connected with a second screw feeding mechanism, the second screw feeding mechanism is connected with a sliding seat of a second rolling guide rail, a vertical feeding mechanism and a second spring support are fixed on the sliding seat of the second rolling guide rail, two second ball supports are fixed on the vertical feeding mechanism, the two second spring supports are respectively arranged on two sides of the vertical feeding mechanism, and the other end of the adjusting support is fixed on the second spring support;
the vertical feeding mechanism comprises a plurality of guide posts, a plurality of third servo motors, a horizontal plate, guide posts and screws, wherein the guide posts are vertically fixed on a sliding seat of a second rolling guide rail, the horizontal plate is movably fixed on the guide posts through linear motion bearings, a third screw hole is formed in the horizontal plate and is used for connecting one end of the third screw through the third screws, and the third servo motors drive the horizontal plate to move up and down along the guide posts through the third screws;
the first screw feeding mechanism comprises a first flange plate and a first screw rod, a bearing is arranged in the first flange plate, one end of the first screw rod is sleeved in the bearing, an output shaft of the first servo motor is connected with the first screw rod, a clamping block is arranged below a sliding seat of the first rolling guide rail, a screw hole is formed in the clamping block, the first screw rod penetrates through the screw hole, and the first servo motor pushes the sliding seat of the first rolling guide rail to slide on the first rolling guide rail through the first screw rod;
the wireless terminal is characterized in that encoders are arranged in the first servo motor, the second servo motor and the third servo motor, the encoders are further connected with a wireless unit, the wireless unit is connected with the handheld terminal in a wireless communication mode, a wireless module is arranged in the handheld terminal, the wireless module and the wireless unit are communicated through a Zigbee protocol, and a plurality of keys are arranged on the handheld terminal to control the first servo motor, the second servo motor and the third servo motor.
2. The axis alignment device of a large cylindrical workpiece according to claim 1, wherein the fixing position of the large cylindrical workpiece placed by the adjusting bracket is set to be arc-shaped, the arc-shaped is 1/4 circle, the bottom end of the adjusting bracket is provided with a strip-shaped groove, the strip-shaped groove is used for supporting by a first ball and a second ball, and the rolling balls of the first ball and the second ball are both protruded on the inner wall of the adjusting bracket.
3. The axis alignment device of a large cylindrical workpiece according to claim 2, wherein the first spring support and the second spring support are composed of a spring and a hydraulic rod, the spring is sleeved on the hydraulic rod, two ends of the hydraulic rod are connected with two ends of the spring through metal sheets, the metal sheet at one end of the hydraulic rod is welded to the bottom surface of the adjusting support, and the metal sheet at the other end of the hydraulic rod is welded to the upper surface of the sliding seat.
CN201710590452.3A 2017-07-19 2017-07-19 Axis alignment device for large cylindrical workpiece Active CN107378470B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710590452.3A CN107378470B (en) 2017-07-19 2017-07-19 Axis alignment device for large cylindrical workpiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710590452.3A CN107378470B (en) 2017-07-19 2017-07-19 Axis alignment device for large cylindrical workpiece

Publications (2)

Publication Number Publication Date
CN107378470A CN107378470A (en) 2017-11-24
CN107378470B true CN107378470B (en) 2023-09-05

Family

ID=60335963

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710590452.3A Active CN107378470B (en) 2017-07-19 2017-07-19 Axis alignment device for large cylindrical workpiece

Country Status (1)

Country Link
CN (1) CN107378470B (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1485672A (en) * 2002-08-27 2004-03-31 ������������ʽ���� Cam mechanism of a photographing lens
CN102594041A (en) * 2012-03-09 2012-07-18 上海克来机电自动化工程有限公司 Device for automatically and synchronously assembling magnetic shoes and U-shaped spring of direct-current motor
CN202668059U (en) * 2012-02-14 2013-01-16 烟台金晖铜业有限公司 Parallel type milling and drilling machine
CN103240603A (en) * 2012-02-14 2013-08-14 烟台金晖铜业有限公司 Parallel drilling and milling machine
CN103889765A (en) * 2011-10-19 2014-06-25 株式会社捷太格特 Driving force transmission device
CN104607984A (en) * 2014-12-19 2015-05-13 山东永华机械有限公司 Wall-hanging type screw supporting device for gantry machining center
CN205032897U (en) * 2015-08-26 2016-02-17 长治市永华机械有限公司 A circular arc and an axle type repairing welding are met sb. at airport

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6591652B1 (en) * 2001-07-13 2003-07-15 Emerson Electric Co. Roll grooving apparatus
US8015854B2 (en) * 2006-12-19 2011-09-13 Enkotec A/S Mechanism for feeding blanks to be threaded into a thread rolling machine
JP4971063B2 (en) * 2007-07-27 2012-07-11 株式会社ダイヘン Transport device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1485672A (en) * 2002-08-27 2004-03-31 ������������ʽ���� Cam mechanism of a photographing lens
CN103889765A (en) * 2011-10-19 2014-06-25 株式会社捷太格特 Driving force transmission device
CN202668059U (en) * 2012-02-14 2013-01-16 烟台金晖铜业有限公司 Parallel type milling and drilling machine
CN103240603A (en) * 2012-02-14 2013-08-14 烟台金晖铜业有限公司 Parallel drilling and milling machine
CN102594041A (en) * 2012-03-09 2012-07-18 上海克来机电自动化工程有限公司 Device for automatically and synchronously assembling magnetic shoes and U-shaped spring of direct-current motor
CN104607984A (en) * 2014-12-19 2015-05-13 山东永华机械有限公司 Wall-hanging type screw supporting device for gantry machining center
CN205032897U (en) * 2015-08-26 2016-02-17 长治市永华机械有限公司 A circular arc and an axle type repairing welding are met sb. at airport

Also Published As

Publication number Publication date
CN107378470A (en) 2017-11-24

Similar Documents

Publication Publication Date Title
CN204639883U (en) A kind of stainless steel tube polissoir
KR200488342Y1 (en) Servo rotation type full function cutter module for a spring forming machine
CN202922261U (en) Axle box body locating device
CN106826954A (en) A kind of smart-cut equipment based on Internet of Things
CN112247958A (en) Industrial robot calibration mechanism and calibration method
CN117324692A (en) Orifice chamfering device for machining mechanical parts
CN107378470B (en) Axis alignment device for large cylindrical workpiece
CN212350449U (en) Refractory material detects with system appearance device with many drill bits
CN211638371U (en) Precision machine perforating device
CN112658693A (en) Diversified high-efficient type processing equipment of built-in main shaft
CN219747016U (en) Gantry numerical control machine tool for multidirectional machining
CN201030491Y (en) Universal positioning device for processing contraprop faying surface
CN203791635U (en) Rotary coaxial processing lathe
CN206883168U (en) A kind of axis alignment device of large cylinder workpiece
CN113319431B (en) Roller surface laser texturing device
CN206276921U (en) A kind of support board structure of numerically controlled lathe
CN115090918A (en) High-speed through type drilling center
CN111001859B (en) Controllable sliding structure of planer type milling machine
CN113732360A (en) Angle-adjustable drilling device for machining
CN106180800A (en) The device of the boring Internal Spherical Surface of teaching
CN201795013U (en) Support device for horizontal lead screw
CN211362436U (en) Cutting machine is used in production of plastic-aluminum door and window
CN216858335U (en) Steel sheet multistation high accuracy drilling equipment
CN219007326U (en) Pressfitting machine is used in 3D floor preparation
CN207875220U (en) The miniature engraving machines of 3D

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