CN107084834B - It is able to achieve the uplock reliability test of lock ring lateral position adjustment - Google Patents
It is able to achieve the uplock reliability test of lock ring lateral position adjustment Download PDFInfo
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- CN107084834B CN107084834B CN201710264899.1A CN201710264899A CN107084834B CN 107084834 B CN107084834 B CN 107084834B CN 201710264899 A CN201710264899 A CN 201710264899A CN 107084834 B CN107084834 B CN 107084834B
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- lock ring
- uplock
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- load
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H21/00—Gearings comprising primarily only links or levers, with or without slides
- F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
- F16H21/16—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and reciprocating motion
- F16H21/18—Crank gearings; Eccentric gearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Transmission Devices (AREA)
Abstract
It is able to achieve the uplock reliability test of lock ring lateral position adjustment, belongs to air equipment uplock reliability test technical field.The present invention is to solve the problem of that existing aircraft uplock experimental rig overall stiffness is low and can not achieve lock ring lateral position and artificially adjust.Its uplock is test specimen, is mounted on support stand；Lock ring module, crank module and load driver module are located at the lower section of uplock, are fixed on the table top of shake table by support respectively；Lock ring module is used to simulate the up and down motion of lock ring under truth, and is able to achieve the adjustment of lock ring lateral position；Load driver module loads service load to uplock for driving lock ring to move up and down, and by lock ring module；Crank module is between lock ring module and load driver module, for by the movement of load driver module and load transmission to lock ring module.The present invention is used for the reliability test of uplock.
Description
Technical field
The present invention relates to the uplock reliability tests for being able to achieve the adjustment of lock ring lateral position, belong on air equipment
Position lock reliability test technical field.
Background technique
Uplock is the important spare part of aircraft, is not only present in undercarriage, undercarriage door, transporter back cargo hold door etc.
It in traditional mechanism, exists in some novel mechanisms, such as the lift fan hatch door mechanism of F-35, the goods of X-37B sky and space plane
Storehouse hatch door mechanism etc..All kinds of movement mechanisms that uplock is used to lock or unlock on aircraft are be easy to cause winged once failing
Machine mission failure or even the major accident of fatal crass.Therefore, the reliability of uplock is the emphasis of airplane design personnel concern
Content.In order to assess the reliability index of aircraft uplock, exposure dominant failure mode and weak link, and realize reliability water
Flat raising, it is very necessary for carrying out reliability test to uplock in laboratory environments.
In flight course, uplock use condition is severe, at the same bear random vibration, height epidemic disaster, lock ring load,
The comprehensive function of many factors such as hydraulic pressure.Therefore need experimental rig that can simulate the motor function of uplock, to latch hook plus
Maneuvering load is carried, while there is lesser volume, weight and biggish rigidity, the lesser integrated environment examination in space can be mounted on
In tryoff.In addition, lock ring lateral position is to influence one of the opening/closing lock function of uplock and key factor of reliability, it is necessary to
The artificial control and adjustment of lock ring lateral position are realized during the test.
Chinese patent " a kind of device for testing reliability of cabin door lock for aircrafts ", publication No. 102530265, and a kind of " aircraft
Uplock reliability test ", publication No. 104019983, respectively for hatch door shaft and the perpendicular peace of latch hook shaft
Capable situation proposes two kinds of experimental rigs, it is unable to adjust the lateral position of lock ring.
Chinese patent " the vertical experimental rig for undercarriage hatch door uplock reliability test ", publication No. is
103983444, provide a kind of experimental rig for trigger-type uplock, it by the position of " front guide slot " and " rear guide groove " come
The lateral position of adjustment and control lock ring.Chinese patent " the horizontal examination for undercarriage hatch door uplock reliability test
Experiment device ", publication No. 103983443 and Chinese patent " a kind of improved aircraft landing gear cabin door lock experimental rig " are public
Cloth number is 105841951, and in two kinds of experimental rigs, lock ring lateral position is controlled and adjusted by the length of " rotating beam ".
Problem is shared existing for above-mentioned five kinds of experimental rigs is: overall stiffness is lower, can generate seriously in the low frequency region of random vibration
Covibration, can not make uplock bear random vibration power spectral density be within the defined limits of error.
Summary of the invention
It is low the invention aims to solve existing aircraft uplock experimental rig overall stiffness, and can not achieve lock ring
The problem of lateral position artificially adjusts provides a kind of uplock reliability test dress for being able to achieve the adjustment of lock ring lateral position
It sets.
The uplock reliability test of the present invention for being able to achieve the adjustment of lock ring lateral position, it includes supporting table
Frame, it further includes lock ring module, crank module and load driver module；
Uplock is mounted on support stand, and lock ring module, crank module and load driver module are set to uplock
Lower section；
Support stand includes uplock mounting plate, stiffening plate and bottom plate, and uplock mounting plate is vertically mounted on bottom plate, adds
Strong plate is fixedly connected on the side of uplock mounting plate and is fixed on bottom plate；Uplock is mounted on uplock mounting plate；
Lock ring module includes lock ring, rocker arm, lock ring adjusting rod, rocker arm support and connecting rod, and a pair of of auricle is arranged in one end,
Pinhole is respectively set on a pair of of auricle, lock ring is mounted between a pair of of auricle by pin, and be located at uplock below with it is upper
The adaptable position of the latch hook of position lock；Threaded hole is arranged in the rocker arm other end, and the threaded one end of lock ring adjusting rod is mounted on rocker arm
Threaded hole in, the lock ring adjusting rod other end has oscillating bearing, which is fixed by rocker arm support；
Crank module includes No.1 crank, shaft, No. two cranks and crank support, and shaft level is mounted on crank support
On, one end of the inner end consolidation No.1 crank of shaft is connected between the other end and lock ring of No.1 crank by connecting rod；Shaft
Outboard end consolidate No. two cranks one end；
Load driver module includes screw rod connector, screw rod, adjusting nut, spring, load frame, pressurized strut, load frame support
And linear slide bearing,
Mounting hole is arranged in the both ends for loading frame, and for installing linear slide bearing, screw rod is slidably mounted on load frame
Two linear slide bearings in, one end of screw rod is connected through a screw thread screw rod connector, and two groups of mounting ears are arranged on screw rod connector
Piece, one group of lug-mounted connect the other end of No. two cranks by pin；Another group of lug-mounted connects pressurized strut by pin
The end strip-shaped hole of pull rod；
A pair of of auricle is respectively set in two sides above and below the load one end of frame far from screw rod connector, and a pair of of auricle of upside is for pacifying
The outboard end of pressurized strut is filled, a pair of of auricle of downside is for connecting load frame support；Spring and adjusting nut are mounted on screw rod,
Positioned at the inside of load frame.
Advantages of the present invention: the present invention, which is directed in aircraft uplock reliability test, needs load vibration stress, and simulates
Position lock movement and lock ring load load demand and propose, have it is small in size, light-weight, rigidity is sufficiently large and with long service life
Advantage.The present invention is able to achieve the artificial control and adjustment of lock ring lateral position, to be conducive to study lock ring during the test
Influence of the lateral position to uplock motor function and reliability.
The present invention includes support stand, lock ring module, crank module and load driver module, and uplock is test specimen, installation
On support stand.Lock ring module, crank module and load driver module are located at the lower section of uplock, pass through support respectively
It is fixed on the table top of shake table.Lock ring module is used to simulate the up and down motion of lock ring under truth, and is able to achieve lock ring cross
Adjustment to position；Load driver module loads work to uplock for driving lock ring to move up and down, and by lock ring module
Load；Crank module is between lock ring module and load driver module, for passing the movement of load driver module and load
It is delivered in lock ring module.
The present invention by rocker arm and lock ring adjusting rod realize lock ring lateral position it is artificial control and adjustment, and operate compared with
For convenience, it can be used to study influence of the lock ring lateral position to uplock motor function and reliability；Linear slide in the present invention
The torque that the radial load that bearing is born is used to that pressurized strut pulling force to be overcome to generate screw rod, since the arm of force is shorter, linear slide
Radial load suffered by bearing is smaller, will not generate violent abrasion, and the service life of experimental rig is longer；After unlocking, in bullet
Under the action of spring force, pressurized strut pull rod and lock ring automatically revert to the position before locking, are not required to provide pressure to pressurized strut again,
Therefore the control system entirely tested is simplified.
Detailed description of the invention
Fig. 1 is three-dimensional installation diagram of the experimental rig of the present invention under uplock opening state；
Fig. 2 is three-dimensional installation diagram of the experimental rig when uplock is triggered；
Fig. 3 is three-dimensional installation diagram of the experimental rig under uplock closed state；
Fig. 4 is the stereoscopic schematic diagram that latch hook is installed on support stand；
Fig. 5 is the perspective view of lock ring module；
Fig. 6 is the perspective view of load driver module；
Fig. 7 is the perspective view for loading frame；
Fig. 8 is the perspective view of crank and shaft；
Fig. 9 is the perspective view of shaft.
Specific embodiment
Specific embodiment 1: illustrating present embodiment below with reference to Fig. 1 to Fig. 9, lock is able to achieve described in present embodiment
The uplock reliability test of ring lateral position adjustment, it includes support stand, it further includes lock ring module, crank module
With load driver module；
Uplock is mounted on support stand, and lock ring module, crank module and load driver module are set to uplock
Lower section；
Support stand includes uplock mounting plate 1, stiffening plate 2 and bottom plate 3, and uplock mounting plate 1 is vertically mounted on bottom plate 3
On, stiffening plate 2 is fixedly connected on the side of uplock mounting plate 1 and is fixed on bottom plate 3；Uplock is mounted on uplock peace
In loading board 1；
Lock ring module includes lock ring 5, rocker arm 6, lock ring adjusting rod 7, rocker arm support 8 and connecting rod 9,6 one end of rocker arm setting one
To auricle, pinhole is respectively set on a pair of of auricle, lock ring 5 is mounted between a pair of of auricle by pin, and is located at uplock
The adaptable position of the latch hook 4 of lower section and uplock；Threaded hole, the threaded one end of lock ring adjusting rod 7 is arranged in 6 other end of rocker arm
It is mounted in the threaded hole of rocker arm 6,7 other end of lock ring adjusting rod has oscillating bearing, and the oscillating bearing is solid by rocker arm support 8
It is fixed；
Crank module includes No.1 crank 10,11, No. two cranks 12 of shaft and crank support 13, the horizontal installation of shaft 11
On crank support 13, one end of the inner end of shaft 11 consolidation No.1 crank 10, the other end and lock ring 5 of No.1 crank 10 it
Between connected by connecting rod 9；The outboard end of shaft 11 consolidates one end of No. two cranks 12；
Load driver module includes screw rod connector 14, screw rod 15, adjusting nut 16, spring 17, load frame 18, pressurized strut
19, frame support 20 and linear slide bearing 21 are loaded,
Mounting hole is arranged in the both ends for loading frame 18, and for installing linear slide bearing 21, screw rod 15 is slidably mounted on
In two linear slide bearings 21 for loading frame 18, one end of screw rod 15 is connected through a screw thread screw rod connector 14, screw rod connector 14
Two groups of lug-mounteds of upper setting, one group of lug-mounted connect the other end of No. two cranks 12 by pin；Another group of lug-mounted
The end strip-shaped hole of 19 pull rod of pressurized strut is connected by pin；
A pair of of auricle is respectively set in two sides above and below the load one end of frame 18 far from screw rod connector 14, and a pair of of auricle of upside is used
In the outboard end of installation pressurized strut 19, a pair of of auricle of downside is for connecting load frame support 20；Spring 17 and adjusting nut 16
It is mounted on screw rod 15, positioned at the inside of load frame 18.
In present embodiment, the bottom plate of support stand is located at lowest part, is horizontally arranged, is provided with the spiral shell connecting with shake table
Keyhole.Uplock mounting plate is fixedly arranged in a vertical manner above bottom plate, and is provided with uplock mounting hole.Stiffening plate is with vertical side
Formula is fixedly arranged at the top of bottom plate, and consolidates with uplock mounting plate, and stiffening plate 2 carries out the vertical stiffness of uplock mounting plate 1
Reinforce.
Lock ring is mounted on rocker arm end by pin in lock ring module, is located at below uplock.The root of rocker arm is provided with
Threaded hole.There is screw thread in lock ring adjusting rod one end, is mounted in the threaded hole of rocker arm root, by precession or screws out lock ring adjusting rod
The lateral position of lock ring can be adjusted.The lock ring adjusting rod other end is mounted on rocker arm support by pin, keeps rocker arm upper and lower
It swings.
Shaft is mounted in a horizontal manner on crank support in crank module, and No.1 crank and No. two cranks are fixedly arranged at respectively
The both ends of shaft.To prevent movement interference, suitable angle is provided between No.1 crank and No. two cranks.Connecting rod is mounted on lock
Between ring and No.1 crank.
The load frame of load driver module is cuboid frame-shaped construction, is vertically arranged with the through-hole for installing screw rod,
Root is provided with two groups of auricles connecting with load frame support and pressurized strut.Screw rod is mounted on load frame, spring and adjusting spiral shell
Mother is mounted on screw rod, is located inside load frame.Screw rod connector is fixedly arranged at screw end, is provided with and No. two cranks and pressurized strut
The pin of connection.There is strip-shaped hole in the end of pressurized strut pull rod.
In conjunction with Fig. 1 to Fig. 4, uplock mounting plate 1, stiffening plate 2 and the bottom plate 3 in support stand are whole by aluminium alloy plate
It cuts, three is consolidated by welding.
Shown in Fig. 5, rocker arm 6 is formed by aluminium alloy plate overall processing, and end is provided with auricle and pin for installing lock ring 5
Sub-aperture, root are provided with the threaded hole for installing lock ring adjusting rod 7.Lock ring 5 is mounted on the auricle of rocker arm end by pin
It is interior, positioned at the lower section of latch hook 4.Lock ring adjusting rod 7 is externally threaded spherical plain bearing rod end, and threaded one end is mounted on rocker arm 6
In the threaded hole of root, there is one end of oscillating bearing to be directly installed on the table top of shake table by rocker arm support 8, make rocker arm can
To swing up and down.
In Fig. 6 and Fig. 7, load frame 18 is formed by aluminium alloy overall processing.Linear slide bearing 21 is mounted on by bolt
Load the both ends of frame 18.Load frame 18 is directly installed on the table top of shake table by loading frame support 20, and can be swung up and down.
Screw rod 15 is mounted in the hole of linear slide bearing 21, and freely slidable.Inside load frame 18, spring 17 is located at close add
The side of frame support 20 is carried, the free end of spring 17 is adjusted by adjusting nut 16.
Specific embodiment 2: illustrating present embodiment below with reference to Fig. 8 and Fig. 9, present embodiment is to embodiment one
It is described further, there is step at 11 both ends of shaft, and No.1 crank 10 and No. two cranks 12 are connected to the low of 11 two sides of shaft
At step, and it is locked by installation nut；No.1 crank 10 and No. two cranks 12 are consolidated by flat key or spline and shaft 11.
Shown in Fig. 8 and Fig. 9, there is step at 11 both ends of shaft, for installing No.1 crank 10 and No. two cranks 12, step it is outer
There is screw thread in side, for installing nut, so that two cranks be locked.Two cranks are solid by flat key or spline mode and shaft 11
Knot.Shaft 11 is mounted in a horizontal manner in the axis hole on crank support 13.
Specific embodiment 3: illustrating that present embodiment, present embodiment make embodiment one or two below with reference to Fig. 8
It further illustrates, the angle between No.1 crank 10 and No. two cranks 12 is 120 °.
To prevent in motion process No. two cranks 12 to interfere with screw rod connector 14, between No.1 crank and No. two cranks
It is provided with 120 ° of angle.Connecting rod 9 is mounted between lock ring 5 and No.1 crank 10.
This experimental rig, in use, by precession or back-out lock ring adjusting rod 7, can be adjusted and control in test process
The radius that lock ring 5 is swung up and down, so as to adjust the lateral position of lock ring 5.During the adjustment of 5 lateral position of lock ring, due to lock ring
Adjusting rod 7 is connect by pin with rocker arm support 8, and the rotational angle of lock ring adjusting rod 7 should be 180 ° of integral multiple, therefore minimum
Adjust 1/2 screw pitch that step-length is lock ring adjusting rod 7.
Before on-test, the length of 19 pull rod of pressurized strut, when pressurized strut 19 being made to be retracted into extreme position, 5 energy of lock ring are adjusted
Reach the position of triggering uplock.In fact, very high degree of regulation is not needed, when pressurized strut 19 is retracted into extreme position
When, 5 position of lock ring is also acceptable only slight beyond theoretical trigger position, such as more than 1mm, will not influence test result.
In addition, adjusting the position of adjusting nut 16 before on-test, after closing uplock, the load that lock ring 5 is born is located at requirement
Within the limits of error.
Experimental rig operating process of the invention is as follows:
Step 1: before locking, latch hook 4 is located at opening state, and lock ring 5 is located at extreme lower position.
Step 2: when locking, uplock and the pressure supply simultaneously of pressurized strut 19, the pull rod of pressurized strut 19 retracts and compressed spring 17,
Lock ring 5 is driven to move upwards and hit latch hook 4 by crank module simultaneously.
Step 3: when pressurized strut 19 is retracted into extreme position, lock ring 5 triggers uplock.
Step 4: after uplock is triggered, latch hook 4 is actively closed, while driving screw rod 15 by lock ring 5 and crank module
It retracts, and continues compressed spring 17.
Step 5: after uplock is closed, 19 pressure release of pressurized strut.
Step 6: when unlocking, uplock provides unlocking pressure and is opened to extreme position, 19 pull rod of screw rod 15 and pressurized strut
It is stretched out under the driving of 17 elastic force of spring, while lock ring 5 being driven to move to extreme lower position.
Claims (3)
1. a kind of uplock reliability test for being able to achieve the adjustment of lock ring lateral position, it includes support stand, supporting table
Frame includes uplock mounting plate (1), stiffening plate (2) and bottom plate (3), and uplock mounting plate (1) is vertically mounted on bottom plate (3),
Stiffening plate (2) is fixedly connected on the side of uplock mounting plate (1) and is fixed on bottom plate (3)；Uplock is mounted on upper
It locks on mounting plate (1), which is characterized in that it further includes lock ring module, crank module and load driver module；
Uplock is mounted on support stand, and lock ring module, crank module and load driver module are set to the lower section of uplock；
Lock ring module includes lock ring (5), rocker arm (6), lock ring adjusting rod (7), rocker arm support (8) and connecting rod (9), rocker arm (6) one
A pair of of auricle is arranged in end, and pinhole is respectively set on a pair of of auricle, and lock ring (5) is mounted between a pair of of auricle by pin, and
The position adaptable with the latch hook (4) of uplock below uplock；Threaded hole is arranged in rocker arm (6) other end, and lock ring is adjusted
Bar (7) threaded one end is mounted in the threaded hole of rocker arm (6), and lock ring adjusting rod (7) other end has oscillating bearing, the pass
Bearings are fixed by rocker arm support (8)；
Crank module includes No.1 crank (10), shaft (11), No. two cranks (12) and crank support (13), and shaft (11) is horizontal
Be mounted on crank support (13), one end of the inner end of shaft (11) consolidation No.1 crank (10), No.1 crank (10)
It is connect between the other end and lock ring (5) by connecting rod (9)；The outboard end of shaft (11) consolidates one end of No. two cranks (12)；
Load driver module includes screw rod connector (14), screw rod (15), adjusting nut (16), spring (17), load frame (18), makees
Dynamic cylinder (19), load frame support (20) and linear slide bearing (21),
Mounting hole is arranged in the both ends for loading frame (18), and for installing linear slide bearing (21), screw rod (15) is slidably installed
In two linear slide bearings (21) of load frame (18), one end of screw rod (15) is connected through a screw thread screw rod connector (14),
Two groups of lug-mounteds are set on screw rod connector (14), and one group of lug-mounted connects the other end of No. two cranks (12) by pin；
Another group of lug-mounted connects the end strip-shaped hole of pressurized strut (19) pull rod by pin；
A pair of of auricle is respectively set in two sides up and down for the one end of load frame (18) far from screw rod connector (14), and a pair of of auricle of upside is used
In the outboard end of installation pressurized strut (19), a pair of of auricle of downside is for connecting load frame support (20)；Spring (17) and adjusting
Nut (16) is mounted on screw rod (15), is located at the inside of load frame (18).
2. the uplock reliability test according to claim 1 for being able to achieve the adjustment of lock ring lateral position, feature
It is, there is step at shaft (11) both ends, and No.1 crank (10) and No. two cranks (12) are connected to the low of shaft (11) two sides
At step, and it is locked by installation nut；No.1 crank (10) and No. two cranks (12) pass through flat key or spline and shaft (11)
Consolidation.
3. the uplock reliability test according to claim 2 for being able to achieve the adjustment of lock ring lateral position, feature
It is, the angle between No.1 crank (10) and No. two cranks (12) is 120 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710264899.1A CN107084834B (en) | 2017-04-21 | 2017-04-21 | It is able to achieve the uplock reliability test of lock ring lateral position adjustment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710264899.1A CN107084834B (en) | 2017-04-21 | 2017-04-21 | It is able to achieve the uplock reliability test of lock ring lateral position adjustment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107084834A CN107084834A (en) | 2017-08-22 |
| CN107084834B true CN107084834B (en) | 2019-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710264899.1A Active CN107084834B (en) | 2017-04-21 | 2017-04-21 | It is able to achieve the uplock reliability test of lock ring lateral position adjustment |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801617A (en) * | 2018-06-12 | 2018-11-13 | 西北工业大学 | A kind of load-measuring device for cabin door lock reliability test |
| CN109969428B (en) * | 2019-02-28 | 2024-03-29 | 西安生淼机电科技有限责任公司 | Test method of comprehensive test device for reliability and static strength/rigidity of upper lock of nose landing gear of airplane |
| CN110763451B (en) * | 2019-11-15 | 2021-06-01 | 西北工业大学 | Cabin door lock reliability test device capable of controlling lock hook load and lock ring position |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7552627B2 (en) * | 2006-05-01 | 2009-06-30 | Goodrich Corporation | Brake wear measurement apparatus and method |
| DE102010053277A1 (en) * | 2010-12-02 | 2012-06-06 | Airbus Operations Gmbh | Locking fixture, recliner fixture, component system, main wing of an aircraft wind tunnel model and aircraft wind tunnel model with such a main wing |
| CN202158921U (en) * | 2011-07-20 | 2012-03-07 | 西安艾威科技有限公司 | Test board for self-locking moment of airplane wheel nut |
| CN103983444B (en) * | 2014-05-21 | 2016-05-25 | 西北工业大学 | For the vertical experimental rig of undercarriage hatch door uplock reliability test |
| CN103983443B (en) * | 2014-05-21 | 2016-07-06 | 西北工业大学 | Horizontal test device for undercarriage hatch door uplock reliability test |
| CN105004521B (en) * | 2015-08-18 | 2017-08-25 | 浙江国检检测技术股份有限公司 | It is a kind of to be used for the device of aircraft quick-detachable lock durability and slow test |
| CN105841951B (en) * | 2016-05-25 | 2018-07-13 | 西北工业大学 | A kind of improved aircraft landing gear cabin door lock experimental rig |
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