CN109279046A - A kind of cabin fill method and cabin filling device cart - Google Patents

A kind of cabin fill method and cabin filling device cart Download PDF

Info

Publication number
CN109279046A
CN109279046A CN201811039111.8A CN201811039111A CN109279046A CN 109279046 A CN109279046 A CN 109279046A CN 201811039111 A CN201811039111 A CN 201811039111A CN 109279046 A CN109279046 A CN 109279046A
Authority
CN
China
Prior art keywords
cabin
filling
layer bracket
cart
sliding rail
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
Application number
CN201811039111.8A
Other languages
Chinese (zh)
Other versions
CN109279046B (en
Inventor
韩凯
高建
冯建民
贺谦
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.)
AVIC Aircraft Strength Research Institute
Original Assignee
AVIC Aircraft Strength Research Institute
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 AVIC Aircraft Strength Research Institute filed Critical AVIC Aircraft Strength Research Institute
Priority to CN201811039111.8A priority Critical patent/CN109279046B/en
Publication of CN109279046A publication Critical patent/CN109279046A/en
Application granted granted Critical
Publication of CN109279046B publication Critical patent/CN109279046B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64FGROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F5/00Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
    • B64F5/60Testing or inspecting aircraft components or systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62BHAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B3/00Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Automatic Assembly (AREA)

Abstract

This application provides a kind of cabin fill method and cabin filling device carts.The cabin fill method includes the following steps: step 1: sliding rail cart group is installed to I-shaped sliding rail;Step 2: by lower floor support be placed on engine room floor, and suspend lower floor support;Step 3: filled and process being placed on lower floor support, places upper layer bracket on the filled and process being well placed;Step 4: upper layer bracket and lower floor support are connected by bandage;Step 5: by the hanging ring of the sunpender of cable wire connecting sliding rail cart group and upper layer bracket, shrinking the brake screw of lower floor support, be suspended on filled and process on sliding rail cart and form filling device;Step 6: pushing filling device that it is made to reach the predetermined position in aircraft cabin.The cabin fill method of the application utilizes cabin sliding rail, and filler can be made to move into cabin from hatch door along sliding rail, avoid manual handling, efficient and convenient.

Description

Cabin filling method and cart for cabin filling device
Technical Field
The application belongs to the technical field of airplane structure fatigue tests, and particularly relates to a cabin filling method and a cart for a cabin filling device.
Background
In the fatigue test of the airplane structure, the cabin pressurization test is an important test item of the airplane structure test. From the aspects of the pressurizing load characteristics and safety of test projects, the pressurizing equipment is required to rapidly inflate the cabin to reach the pressurizing load required by the test in the cabin pressurizing test, and the cabin is rapidly deflated to complete a rise and fall cycle, so that the test risk is reduced, and the test speed is accelerated. Currently, the method used is to fill the cabin with filler to reduce the required inflation space and the amount of inflation to achieve the above objectives. The method is applied to the static test of the airplane structure, but the following problems exist in the practical application of the fatigue test of the airplane structure: fatigue tests require that the aircraft structure be inspected every day, and that it is necessary to remove all the filler from the cabin for comprehensive inspection and maintenance when a certain number of landing gear is reached. This requires that the tester will carry the filler out of the cabin by hand during the inspection, which is laborious and time-consuming, and seriously affects the fatigue test progress of the aircraft, resulting in an increase in test cost.
Accordingly, a technical solution is desired to overcome or at least alleviate at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
It is an object of the present application to provide a cabin filling method that solves at least one of the above-mentioned drawbacks of the prior art.
The technical scheme of the application is as follows:
the application provides a cabin filling method, which is used for filling a filling device into an aircraft cabin, and the cabin filling method comprises the following steps:
step 1: mounting the sliding rail cart group on an I-shaped sliding rail at the upper part of an aircraft cabin;
step 2: placing a lower layer bracket with a brake screw on the floor of the engine room, and controlling the brake screw to extend out, so that the lower layer bracket is suspended;
and step 3: placing the filling foam on the lower layer bracket, and placing the upper layer bracket on the placed filling foam;
and 4, step 4: the upper layer bracket and the lower layer bracket are connected through the binding belt, and the binding belt is tightened through adjusting a ratchet type tightener on the binding belt, so that the upper layer bracket and the lower layer bracket are enabled to clamp the filling foam in the middle to form a whole;
and 5: connecting a steel cable with an anti-falling hook with a suspender of the sliding rail cart group and a hanging ring of an upper layer bracket, and contracting a brake screw of a lower layer bracket to enable filling foam to be hung on the sliding rail cart, thereby forming a filling device;
step 6: and pushing the filling device to reach a preset position in the aircraft cabin, extending out the brake screw rod 5, and transferring the weight load of the filling device to the floor of the aircraft body through the slide rail.
Preferably, the nacelle filling method further comprises:
step 6: and repeatedly manufacturing the filling devices, so that the cabin of the airplane is filled with a preset number of filling devices.
Preferably, the step 6 further comprises:
there is a space between any two filling devices.
Preferably, each of the trolley sets comprises two trolley trolleys.
The application also provides a cart for the cabin filling device, which comprises an upper layer bracket, a lower layer bracket, a connecting device and a brake screw rod; wherein,
the upper layer bracket is connected with the lower layer bracket through a connecting device;
the brake screw is installed on the lower layer bracket.
Preferably, the brake screw comprises a brake cylinder and a screw mounted within the brake cylinder, the screw being movable relative to the brake cylinder.
Preferably, the brake screw further comprises a brake pin, the brake cylinder is provided with a first hole, the screw is provided with a plurality of second holes, and the brake pin is adapted to be inserted into the first hole and the second hole simultaneously.
Preferably, the connecting means is a strap.
Preferably, the strap is provided with a ratchet type tightener.
Preferably, the cart for the cabin filling device further comprises a steel cable, wherein the steel cable is arranged on the upper layer bracket and is used for being connected with the sliding rail cart group.
The cabin filling method has the following advantages:
1. the cabin sliding rail is utilized, so that the filler can be moved into the cabin from the cabin door along the sliding rail, manual carrying is avoided, and the cabin is rapid and convenient;
2. the filling devices can slide in the engine room, and the inspection space can be replaced to each space in the engine room through replacement among the filling devices, so that the tester can quickly inspect the structure of the engine room without moving fillers out of the engine room, and the test period is shortened;
3. the filling device and the loading equipment in the cabin are strictly independent in space, so that the normal operation of the loading equipment in the cabin is prevented from being influenced, and potential safety hazards are eliminated;
4. the filling device has the advantages of simple structure, simplicity and convenience in operation, strong practical reliability and suitability for airplane structure fatigue tests.
Drawings
Fig. 1 is a schematic flow diagram of a nacelle filling method according to a first embodiment of the invention.
Fig. 2 is a schematic structural view of a filling device of the cabin filling method of the present invention.
FIG. 3 is a schematic illustration of the cabin filling apparatus of the present application being placed within an aircraft cabin.
Wherein:
the device comprises a sliding rail cart 1, an upper layer bracket 2, a filling foam 3, a binding band with a ratchet wheel type tightener 4, a brake screw rod 5, a lower layer bracket 6 and a steel cable 7.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present application and for simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the scope of the present application.
Fig. 1 is a schematic flow diagram of a nacelle filling method according to a first embodiment of the invention. Fig. 2 is a schematic structural view of a filling device of the cabin filling method of the present invention. FIG. 3 is a schematic illustration of the cabin filling apparatus of the present application being placed within an aircraft cabin.
A cabin filling method as shown in fig. 1 for filling a filling device into an aircraft cabin, the cabin filling method comprising the steps of:
step 1: mounting the sliding rail cart group 1 on an I-shaped sliding rail at the upper part of an aircraft cabin;
step 2: placing the lower layer bracket 6 with the brake screw 5 on the floor of the engine room, and controlling the brake screw to extend out, so that the lower layer bracket 6 is suspended;
and step 3: placing the filling foam 3 on the lower layer bracket 6, and placing the upper layer bracket 2 on the placed filling foam 3;
and 4, step 4: the upper layer bracket 2 and the lower layer bracket 6 are connected through the binding belt 4, and the binding belt is tightened through adjusting a ratchet type tightener on the binding belt 4, so that the upper layer bracket and the lower layer bracket are enabled to clamp the filling foam in the middle to form a whole;
and 5: connecting a steel cable 7 with an anti-falling hook with a suspender of the sliding rail cart group 1 and a hanging ring of the upper layer bracket 2, and contracting a brake screw 5 of the lower layer bracket 6 to make the filling foam 3 hung on the sliding rail cart 1, thereby forming a filling device;
step 6: and pushing the filling device to reach a preset position in the aircraft cabin, extending out the brake screw rod 5, and transferring the weight load of the filling device to the floor of the aircraft body through the slide rail.
The cabin filling method has the following advantages:
1. the cabin sliding rail is utilized, so that the filler can be moved into the cabin from the cabin door along the sliding rail, manual carrying is avoided, and the cabin is rapid and convenient;
2. the filling devices can slide in the engine room, and the inspection space can be replaced to each space in the engine room through replacement among the filling devices, so that the tester can quickly inspect the structure of the engine room without moving fillers out of the engine room, and the test period is shortened;
3. the filling device and the loading equipment in the cabin are strictly independent in space, so that the normal operation of the loading equipment in the cabin is prevented from being influenced, and potential safety hazards are eliminated;
4. the filling device has the advantages of simple structure, simplicity and convenience in operation, strong practical reliability and suitability for airplane structure fatigue tests.
In this embodiment, the nacelle filling method further comprises:
step 6: and repeatedly manufacturing the filling devices, so that the cabin of the airplane is filled with a preset number of filling devices.
In this embodiment, the step 6 further includes: there is a space between any two filling devices.
In the present embodiment, each trolley group 1 comprises two trolleys.
The present application is described in further detail below by way of examples, it being understood that the examples do not constitute any limitation to the present application.
Referring to fig. 2 and 3, in the present embodiment, in a first step, two slide rail carts are respectively mounted on two i-shaped slide rails at the upper part of a cabin, each slide rail cart is a cart with four pulleys and capable of sliding on the slide rails of the cabin, and has a boom mechanism capable of suspending a heavy object;
secondly, placing the lower-layer support with the brake screw on the floor of the engine room, and enabling the brake screw to extend out completely to enable the lower-layer support to be suspended in the air to avoid floor loading equipment;
and thirdly, placing the selected filling foam on a lower layer bracket, and placing an upper layer bracket on the placed filling foam. Then, the upper layer bracket and the lower layer bracket are connected through the binding band, and the binding band is tightened through adjusting a ratchet type tightener on the binding band, so that the upper layer bracket and the lower layer bracket are enabled to clamp the filling foam in the middle to form a whole;
fourthly, connecting a steel cable with an anti-drop hook with a suspender of the sliding rail cart and a hanging ring of the upper layer bracket, and contracting a brake screw of the lower layer bracket to hang the filling foam on the sliding rail cart;
fifthly, pushing the filling device to reach a preset position, extending out the brake screw rod, and transferring the weight load of the filling device to the floor of the machine body through the slide rail to realize the protection of the slide rail;
and a sixth step of repeating the first to fifth steps and moving the filling device into the cabin in sequence without filling the cabin. A plurality of spaces are reserved between the filling devices to be used as inspection spaces (as shown in fig. 3), and channels are reserved on two sides of the filling devices to facilitate the testers to go in and out of the filling devices. Through the replacement between the filling device, the inspection space can be replaced to each space in the aircraft cabin, so that the tester can quickly and comprehensively inspect the aircraft body structure, and the technical requirements of the aircraft structure fatigue test are met.
Preferably, the upper layer bracket and the lower layer bracket are provided with hanging ring structures, so that the connection of the steel cable and the binding belt is convenient.
Preferably, the four corners of the lower support are provided with brake screws which are extended and retracted by rotating the screws, and the structure is convenient for the filling device to be placed on the floor of the cabin when the filling device is in place and keeps a certain distance with the floor (as shown in fig. 3), so that the sliding rails can be protected and the interference with floor loading equipment can be avoided.
In this embodiment, the upper bracket 2 and the lower bracket 6 preferably have a ring structure to facilitate the connection between the cable 7 and the strap 4.
Preferably, the lower support 6 is provided with brake screws 5 at four corners thereof, and is extended and contracted by rotating the screws. The structure is convenient for the filling device to be placed on the floor of the cabin when the filling device is in place, and keeps a certain distance with the floor (as shown in figure 2), thereby not only protecting the sliding rail, but also avoiding the interference with floor loading equipment.
In the fatigue test of the whole airplane, the method is applied, the key problem is solved, and the obvious effect is achieved. Practice proves that the method can reduce the inflation space of the engine room, reduce the inflation quantity, meet the test requirement of quick inflation and deflation, and can improve the test progress and reduce the test cost without moving the filler out of the engine room during inspection and maintenance.
The application also provides a cart for the cabin filling device, which comprises an upper layer bracket, a lower layer bracket, a connecting device and a brake screw rod; wherein, the upper layer bracket is connected with the lower layer bracket through a connecting device; the brake screw is arranged on the lower layer bracket.
In this embodiment, the brake screw includes a brake cylinder and a screw mounted within the brake cylinder, the screw being movable relative to the brake cylinder.
In this embodiment, the brake screw further comprises a brake pin, the brake cylinder is provided with a first hole, the screw is provided with a plurality of second holes, and the brake pin is adapted to be inserted into the first hole and the second hole simultaneously. By adopting the structure, when the screw of the screw rod needs to be braked and fixed, the brake pin can penetrate into the first hole and the second hole.
Referring to fig. 2, in the present embodiment, the attachment means is a strap.
Referring to fig. 2, in the present embodiment, a ratchet-type tightener is provided on the binding band.
Referring to fig. 2, in the present embodiment, the cart for a cabin filling apparatus further includes a wire rope disposed on the upper bracket, and the wire rope 7 is used for connecting with the trolley assembly 1.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A cabin filling method for filling a filling device into an aircraft cabin, characterized in that it comprises the following steps:
step 1: mounting a sliding rail cart group (1) on an I-shaped sliding rail at the upper part of an aircraft cabin;
step 2: placing a lower layer bracket (6) with a brake screw rod (5) on the floor of the engine room, and controlling the brake screw rod to extend out, so that the lower layer bracket (6) is suspended;
and step 3: placing the filling foam (3) on the lower layer bracket (6), and placing the upper layer bracket (2) on the placed filling foam (3);
and 4, step 4: the upper layer bracket (2) and the lower layer bracket (6) are connected through the binding belt (4), and the binding belt is tightened through adjusting a ratchet type tightener on the binding belt (4), so that the upper layer bracket and the lower layer bracket are enabled to clamp the filling foam in the middle to form a whole;
and 5: connecting a steel cable (7) with an anti-drop hook with a suspender of the sliding rail cart group (1) and a hanging ring of the upper layer bracket (2), and contracting a brake screw (5) of the lower layer bracket (6) to make the filling foam (3) hung on the sliding rail cart (1) so as to form a filling device;
step 6: and after the filling device is pushed to reach a preset position in the aircraft cabin, the braking screw rod (5) is extended out, and the weight load of the filling device is transferred to the floor of the aircraft body through the sliding rail.
2. The cabin filling method according to claim 1, further comprising:
step 6: and repeatedly manufacturing the filling devices, so that the cabin of the airplane is filled with a preset number of filling devices.
3. The nacelle filling method as recited in claim 2, wherein the step 6 further comprises:
there is a space between any two filling devices.
4. The nacelle filling method as claimed in claim 1, wherein each skid cart group (1) comprises two skid carts.
5. The cart for the cabin filling device is characterized by comprising an upper layer bracket (2), a lower layer bracket (6), a connecting device and a brake screw rod (5); wherein,
the upper layer bracket (2) is connected with the lower layer bracket (6) through a connecting device;
and the brake screw (5) is arranged on the lower layer bracket (6).
6. The cart for a cabin filling apparatus according to claim 5, characterized in that the brake screw (5) comprises a brake cylinder and a screw mounted in the brake cylinder, the screw being movable relative to the brake cylinder.
7. The cart for a cabin filling apparatus according to claim 6, characterized in that said brake screw (5) further comprises a brake pin, said brake cylinder being provided with a first hole and said screw being provided with a plurality of second holes, said brake pin being adapted to be inserted simultaneously into said first and second holes.
8. The cart for a cabin filling apparatus according to claim 7, characterized in that said connecting means are straps (4).
9. The cart for a cabin filling apparatus according to claim 8, characterized in that the straps (4) are provided with ratchet tighteners.
10. The cart for a cabin filling apparatus according to claim 9, further comprising a wire rope (7), said wire rope (7) being arranged on said upper support (2), said wire rope (7) being adapted to be connected to a trolley cart set (1).
CN201811039111.8A 2018-09-06 2018-09-06 Cabin filling method and cart for cabin filling device Active CN109279046B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811039111.8A CN109279046B (en) 2018-09-06 2018-09-06 Cabin filling method and cart for cabin filling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811039111.8A CN109279046B (en) 2018-09-06 2018-09-06 Cabin filling method and cart for cabin filling device

Publications (2)

Publication Number Publication Date
CN109279046A true CN109279046A (en) 2019-01-29
CN109279046B CN109279046B (en) 2021-07-09

Family

ID=65184231

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811039111.8A Active CN109279046B (en) 2018-09-06 2018-09-06 Cabin filling method and cart for cabin filling device

Country Status (1)

Country Link
CN (1) CN109279046B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102680181A (en) * 2011-03-14 2012-09-19 铁道部运输局 Method and device for testing vehicle body airtightness and fatigue of railway vehicle
CN102935896A (en) * 2011-08-15 2013-02-20 中国航空工业集团公司西安飞机设计研究所 Method for adjusting and controlling cabin pressure
CN106596003A (en) * 2016-11-29 2017-04-26 中国航空工业集团公司沈阳飞机设计研究所 Composite aircraft fuselage section pressurizing test method
US20170149257A1 (en) * 2015-10-30 2017-05-25 Engineering Design, Inc. Field charging unit for various batteries in multiple deployable devices
CN107687921A (en) * 2017-07-07 2018-02-13 中国航空工业集团公司西安飞机设计研究所 A kind of airtight inspection method of aircraft air-tight cabin

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102680181A (en) * 2011-03-14 2012-09-19 铁道部运输局 Method and device for testing vehicle body airtightness and fatigue of railway vehicle
CN102935896A (en) * 2011-08-15 2013-02-20 中国航空工业集团公司西安飞机设计研究所 Method for adjusting and controlling cabin pressure
US20170149257A1 (en) * 2015-10-30 2017-05-25 Engineering Design, Inc. Field charging unit for various batteries in multiple deployable devices
CN106596003A (en) * 2016-11-29 2017-04-26 中国航空工业集团公司沈阳飞机设计研究所 Composite aircraft fuselage section pressurizing test method
CN107687921A (en) * 2017-07-07 2018-02-13 中国航空工业集团公司西安飞机设计研究所 A kind of airtight inspection method of aircraft air-tight cabin

Also Published As

Publication number Publication date
CN109279046B (en) 2021-07-09

Similar Documents

Publication Publication Date Title
CN104309816B (en) Method and tool for unloading wall panel assemblies at cargo space doors of airplanes
CN104163250B (en) A kind of reliability test for undercarriage cabin door lock system
CN108860648B (en) A remove device for main undercarriage in aviation field
CN205452906U (en) Combination dock switch overhauls platform
CN110937105B (en) Automatic gravity center control device and method thereof
CN109279046B (en) Cabin filling method and cart for cabin filling device
CN110320818A (en) A kind of high-speed rail shipping balance control system and method
CN107401381A (en) Telescopic derrick steel wire rope system retractor device
CN207346997U (en) One kind hangs vehicle safety protection device
CN206231381U (en) Rail cable car
CN112896547B (en) Maintenance device for overhauling small aircraft
CN105699104B (en) High-speed flexible sled test device
CN209815528U (en) CT (computed tomography) replacing device inside enclosed bus
CN201671530U (en) Rotary lift emergency escape ladder
US20200407204A1 (en) Mobile lift column cable suspension bracket and associated method
CN211076382U (en) Missile hanging vehicle
CN205333329U (en) High -speed flexible slide rail test device
CN206555707U (en) A kind of counterweight mounting structure of cylinder filling frame
CN106240430A (en) A kind of moving gantry type, rotatable automatic weighing vehicle-mounted Self-loading-unloading equipment
CN205344971U (en) Manual hydraulic pressure commodity circulation car of high stability
CN206555710U (en) A kind of safe and simple cylinder filling frame
CN113348754B (en) Deep space detector safety separation test device and test method
CN105905312A (en) Installation platform and dismounting method thereof for overall floor of large transport aircraft
US3037727A (en) Landing plate
CN207832445U (en) A kind of device of experiment rail wagon brake cylinder criterion of acceptability

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