CN106628222A - Aircraft-carrier arresting cable system based on eddy current braking - Google Patents
Aircraft-carrier arresting cable system based on eddy current braking Download PDFInfo
- Publication number
- CN106628222A CN106628222A CN201610993687.2A CN201610993687A CN106628222A CN 106628222 A CN106628222 A CN 106628222A CN 201610993687 A CN201610993687 A CN 201610993687A CN 106628222 A CN106628222 A CN 106628222A
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- stator
- coil
- aircraft
- rotor
- magnetic
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- 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.)
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- 230000005540 biological transmission Effects 0.000 claims abstract description 29
- 239000000498 cooling water Substances 0.000 claims abstract description 13
- 230000004888 barrier function Effects 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000007853 buffer solution Substances 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 239000000969 carrier Substances 0.000 abstract description 2
- 210000000515 tooth Anatomy 0.000 description 17
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND 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
- B64F1/00—Ground or aircraft-carrier-deck installations
- B64F1/02—Ground or aircraft-carrier-deck installations for arresting aircraft, e.g. nets or cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/02—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type
- H02K49/04—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
The invention discloses an aircraft-carrier arresting cable system based on eddy current braking, and belongs to the technical field of landing arresting of carrier aircrafts of aircraft carriers. When an aircraft lands and hooks an arresting cable, transmission shafts are driven by steel cables to rotate, and meanwhile rotators rotate along with rotating of the transmission shafts; as magnet exciting coils are powered on at the moment, the surfaces of stators rightly opposite to magnetic conductive teeth are cut through magnetic lines, and eddy currents are generated, resistance torque for arresting the rotors to continue to rotate is generated; the resistance torque is transferred to the arresting cable through the transmission shafts and the steel cables, and braking force of a carrier aircraft is formed; when baking is carried out, as the eddy currents are only generated on the stators, heat is only generated on the stators, and is taken away through cooling water in cooling water channels inside the stators; when baking is not required, exciting currents in the coils are powered off through a control cabinet, the coils cannot generate the magnetic lines at the moment, the eddy currents cannot be generated on the surfaces of the stators, and braking torque cannot be generated. The aircraft-carrier arresting cable system serves as a carrier-aircraft landing arresting device, the structure is simple, and controlling is convenient.
Description
Technical field
The present invention relates to a kind of aircraft carrier barrier cable system braked based on current vortex, is belonged to aircraft carrier and warship and block skill
Art field.
Background technology
Modern fixed-wing carrier-borne aircraft flying speed about 200-300km/h, to make it pacify in the type aircraft carrier deck of limited length
Complete warship, it is necessary to install aircraft carrier arrester.
Most of aircraft carriers adopt hydraulic bounce arrester in prior art, and it includes various fine control valves, move close
Envelope etc., complex structure is with high costs, and technical difficulty is big.
The content of the invention
It is with low cost instant invention overcomes the deficiency of hydraulic bounce arrester, there is provided a kind of simple structure, control
The convenient aircraft carrier barrier cable system based on current vortex braking.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：The invention provides it is a kind of based on current vortex brake
Aircraft carrier barrier cable system, the system includes that arresting engine (1), resetting means (2), cable wire (3), arrester wires (4), arrester wires are supported
(5), leading block group (6), pulley buffer system (7), circulating water cooling device (8), switch board (9)；Using circulating water
Device (8) radiates, and prevents braking moment heat fading, strengthens its continuous braking ability；Using resetting means (2) to the resistance after obstruction
Block Suo Jinhang reclaim reset, be next time warship prepare；Gather the tension signal of arrester wires (4) and stop using switch board (9)
Tach signal on machine power transmission shaft (1.5), by adjusting exciting current, to stopping cable system real-time control is carried out.
Further, the arresting engine includes four liquid-cooled electric eddy current brakes (left and right is each two), two, left/right side liquid
Cold type electric eddy current brake stator (1.3) is connected by bearing (1.4) with power transmission shaft (1.5)；Rotor (1.1) by connector with
Power transmission shaft (1.5) is connected as a single entity, and rotating around on the two power transmission shafts (1.5), the other end is passed through and led for one end of two cable wires (3)
It is connected with arrester wires (4) two ends respectively to assembly pulley (6).
Further, stator (1.3) internal layer is cylindrical shape with outer layer, and is connected by annular canister bottom.Stator (1.3) is outward
Layer surface has intake-outlet, and there is cooling water channel inside；The rotor (1.1) is mainly made up of circumferential magnetic teeth, this
A little magnetic teeths " are embedded in " between stator (1.3) ectonexine, and are connected with power transmission shaft (1.5) by connector, and rotor (1.1) is with biography
Moving axis (1.5) rotates together.
Further, rotor (1.1) magnetic teeth is located at stator (1.3) between internal layer and outer layer, in stator (1.3) outer layer
Magnetic force line cutting is received with inner layer outer surface in surface.The addendum circle arc of rotor (1.1) magnetic teeth is with the stator (1.3) outward
About 2 millimeters of gap is kept between layer inner surface circular arc；The bottom of the tooth circular arc and the stator of rotor (1.1) magnetic teeth
(1.3) about 2 millimeters of gap is kept between inner layer outer surface circular arc.
A kind of operation principle of the aircraft carrier barrier cable system braked based on current vortex of the present invention is as follows：
When aircraft warship and hooks arrester wires (4), by cable wire (3) power transmission shaft (1.5) can be driven to rotate, while rotor
(1.1) also rotate with；Now because magnet exciting coil (1.2) be powered, with magnetic teeth just to stator (1.3) surface cut by the magnetic line of force
Current vortex is cut and produces, so as to produce the moment of resistance for hindering rotor (1.1) persistently to rotate, the moment of resistance passes through power transmission shaft (1.5),
Cable wire (3) is delivered on arrester wires (4), forms the brake force to carrier-borne aircraft；During braking, because current vortex is only in stator (1.3)
Upper generation, consequently only that producing heat on stator (1.3), these heats are by the cooling in stator (1.3) internal cooling water channel
Water is taken away；When need not brake, the exciting current in coil (1.2) is disconnected by switch board (9), and now coil (1.2) is also
The magnetic line of force will not be produced, stator (1.3) surface would not produce current vortex, i.e., will not produce braking moment.
Compared with prior art, the present invention has the advantages that.
The present invention is used as a kind of carrier landing arrester, and its simple structure is easy to control.Arrester wires (4) is by steel
Rope (3) and connector drive brake rotor (1.1) rotation, rotor magnetic teeth be located at stator (1.3) internal layer and outer layer it
Between, have cooling water channel inside stator (1.3), when rotor (1.1) is with drive axis, with magnetic teeth just to stator (1.3) table
Face is produced current vortex by magnetic force line cutting, and so as to produce heat on stator (1.3) surface, these heats are finally by cooling water
Cooling water in road is taken away, and the present invention is exactly constantly consumed and converted the mechanical energy of aircraft using this principle, so as to play
The effect of braking.
Of the invention maximum the characteristics of is that cable wire (3) is wound on two power transmission shafts (1.5) of arresting engine (1), simple structure；Resistance
Machine (1) is blocked using liquid-cooled electric eddy current brake, simple structure, reliability is high；Stop machine rotor (1.1) rotary inertia little, it is right
Transmission system affects little；Radiated using circulating water cooling device (8), good heat dissipation effect；Coil (1.2) is concentrated and is directly wound on
On stator (1.3) so that processing technology is simpler；The toroid that coil (1.2) is produced is an entirety, reduces magnetic loss
Lose, improve operating efficiency, simple installation, reliability is high, and the electrodeless regulation of braking moment, real-time control can be realized.
Description of the drawings
Fig. 1 is a kind of aircraft carrier barrier cable system isometric view braked based on current vortex of the present invention；
Fig. 2 is a kind of aircraft carrier barrier cable system arresting engine front view braked based on current vortex of the present invention；
Fig. 3 is a kind of aircraft carrier barrier cable system liquid-cooled electric eddy current brake stator knot braked based on current vortex of the present invention
Structure；
Fig. 4 is a kind of aircraft carrier barrier cable system liquid-cooled electric eddy current brake rotor knot braked based on current vortex of the present invention
Structure；
Fig. 5 is that a kind of aircraft carrier barrier cable system liquid-cooled electric eddy current brake braked based on current vortex of the present invention is mainly tied
Structure parameter；
In figure：1st, arresting engine, 2, resetting means, 3, cable wire, 4, arrester wires, 5, arrester wires support, 6, leading block group, 7,
Pulley buffer system, 8, circulating water cooling device, 9, switch board, 1.1, rotor, 1.2, coil, 1.3, stator, 1.4, bearing,
1.5th, power transmission shaft.
Specific embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
As shown in figure 1, it is a kind of based on current vortex brake aircraft carrier barrier cable system, the system include arresting engine (1), reset
Device (2), cable wire (3), arrester wires (4), arrester wires support (5), leading block group (6), pulley buffer system (7), recirculated water
Cooling device (8), switch board (9)；Arresting engine (1) by four symmetrical arrangements liquid-cooled electric eddy current brakes, and axle
(1.4) and power transmission shaft (1.5) composition are held, every liquid-cooled electric eddy current brake is by rotor (1.1), coil (1.2), stator
(1.3) constitute；Stator (1.3) is connected by bearing (1.4) with power transmission shaft (1.5)；Rotor (1.1) is by connector and power transmission shaft
(1.5) be connected as a single entity, one end of two cable wires (3) rotating around on two power transmission shafts (1.5), the other end of two cable wires (3)
It is connected with arrester wires (4) two ends respectively again through after leading block group (6), pulley buffer system (7)；Rotor (1.1) magnetic teeth
Addendum circle arc and the stator (1.3) outer layer inner surface circular arc between keep about 2 millimeters of gap；The rotor (1.1) is led
About 2 millimeters of gap is kept between the bottom of the tooth circular arc of magnetic tooth and the stator (1.3) inner layer outer surface circular arc.Resetting means (2)
The end of power transmission shaft (1.5) is arranged on, circulating water cooling device (8), switch board (9) and coil are provided with the outside of stator (1.3)
(1.2) connect.
The rotor (1.1) is made up of circumferential magnetic teeth, and rotor (1.1) is rotated with power transmission shaft (1.5).
The internal layer of stator (1.3) is cylindrical shape with outer layer, and is connected by annular canister bottom；The inside of stator (1.3) is provided with cooling water
Road；The coil (1.2) is concentrated and is directly wound on the stator (1.3), and the coil (1.2) and stator (1.3) are
Stationary parts；The coil (1.2) forms toroid after being powered, the toroid is an entirety, to reduce magnetic loss.
The switch board (9) is connected by wire with the coil (1.2), the power on/off and size of current of control coil (1.2),
To reach the purpose of control braking moment.
During work, switch board (9) makes storage battery connect with coil (1.2), makes coil (1.2) be obtained in that excitation ability；Magnetic
Road, through rotor (1.1) magnetic teeth, reaches stator (1.3) outer layer from the beginning of stator (1.3) internal layer, and forms a complete magnetic
Road.Magnetic field is formed in air gap between rotor (1.1) and stator (1.3), the magnetic field is related to exciting current；When aircraft warship simultaneously
When hooking arrester wires (4), by cable wire (3) power transmission shaft (1.5) can be driven to rotate, while rotor (1.1) is also rotated with；Now
Because magnet exciting coil (1.2) is powered, with magnetic teeth just to stator (1.3) surface by magnetic force line cutting and producing current vortex, so as to
The moment of resistance for hindering rotor (1.1) persistently to rotate is produced, the moment of resistance is delivered to arrester wires by power transmission shaft (1.5), cable wire (3)
(4) on, the brake force to carrier-borne aircraft is formed；During braking, because current vortex is only produced on stator (1.3), consequently only that stator
(1.3) heat is produced on, these heats are taken away by the cooling water in stator (1.3) internal cooling water channel；When need not brake,
Exciting current in coil (1.2) is disconnected by switch board (9), and now coil (1.2) would not also produce the magnetic line of force, stator
(1.3) surface would not produce current vortex, i.e., will not produce braking moment.
Embodiment
A electric eddy current brake is designed, rotor adopts mild steel, gas length 1.5mm with stator material.Other are main
Parameter is as follows：Stator outer layer external diameter；Stator outer layer internal diameter；Stator internal layer external diameter；Stator internal layer internal diameter；Brake width w=
475mm；The magnetic teeth number of teeth；D=1000mm；Turn number N=1000 circle；Four brakes always weigh about 20 tons.
During electric current I=45A proper by simulation calculation, the Brake Mean Power F ≈ 1300kN that can be produced；Assume carrier-borne aircraft weight
Amount m=30000kg, warship speed, when not considering the factors such as bias, driftage, air drag, frictional force；By calculating：Averagely subtract
Speed a=43m/s2；Braking time, braking distance.Switch board can by adjust electric current, adjust braking time and braking away from
From.
Claims (4)
1. it is a kind of based on current vortex brake aircraft carrier barrier cable system, it is characterised in that：The system includes arresting engine (1), resets
Device (2), cable wire (3), arrester wires (4), arrester wires support (5), leading block group (6), pulley buffer system (7), recirculated water
Cooling device (8), switch board (9)；Arresting engine (1) by four symmetrical arrangements liquid-cooled electric eddy current brakes, and axle
(1.4) and power transmission shaft (1.5) composition are held, every liquid-cooled electric eddy current brake is by rotor (1.1), coil (1.2), stator
(1.3) constitute；Stator (1.3) is connected by bearing (1.4) with power transmission shaft (1.5)；Rotor (1.1) is by connector and power transmission shaft
(1.5) be connected as a single entity, one end of two cable wires (3) rotating around on two power transmission shafts (1.5), the other end of two cable wires (3)
It is connected with arrester wires (4) two ends respectively again through after leading block group (6), pulley buffer system (7)；Rotor (1.1) magnetic teeth
Addendum circle arc and the stator (1.3) outer layer inner surface circular arc between keep about 2 millimeters of gap；The rotor (1.1) is led
About 2 millimeters of gap is kept between the bottom of the tooth circular arc of magnetic tooth and the stator (1.3) inner layer outer surface circular arc；Resetting means (2)
The end of power transmission shaft (1.5) is arranged on, circulating water cooling device (8), switch board (9) and coil are provided with the outside of stator (1.3)
(1.2) connect.
2. it is according to claim 1 it is a kind of based on current vortex brake aircraft carrier barrier cable system, it is characterised in that：Rotor
(1.1) it is made up of circumferential magnetic teeth, rotor (1.1) is rotated with power transmission shaft (1.5)；The internal layer of stator (1.3)
Cylindrical shape is with outer layer, and is connected by annular canister bottom；The inside of stator (1.3) is provided with cooling water channel；The coil (1.2)
Concentrate and be directly wound on the stator (1.3), the coil (1.2) and stator (1.3) are stationary parts；The coil
(1.2) toroid is formed after being powered, the toroid is an entirety, to reduce magnetic loss；The switch board (9) passes through
Wire is connected with the coil (1.2), the power on/off and size of current of control coil (1.2), to reach control brake force
The purpose of square.
3. it is according to claim 1 it is a kind of based on current vortex brake aircraft carrier barrier cable system, it is characterised in that：Work
When, switch board (9) makes storage battery connect with coil (1.2), makes coil (1.2) be obtained in that excitation ability；Magnetic circuit is from stator (1.3)
Internal layer starts, and through rotor (1.1) magnetic teeth, reaches stator (1.3) outer layer, and forms a complete magnetic circuit；Rotor (1.1) with
Magnetic field is formed in air gap between stator (1.3), the magnetic field is related to exciting current；When aircraft warship and hooks arrester wires (4)
When, by cable wire (3) power transmission shaft (1.5) can be driven to rotate, while rotor (1.1) is also rotated with；Now because of magnet exciting coil
(1.2) be powered, with magnetic teeth just to stator (1.3) surface by magnetic force line cutting and current vortex is produced, hinder to turn so as to produce
The moment of resistance that sub (1.1) persistently rotate, the moment of resistance is delivered on arrester wires (4) by power transmission shaft (1.5), cable wire (3), is formed
Brake force to carrier-borne aircraft.
4. it is according to claim 1 it is a kind of based on current vortex brake aircraft carrier barrier cable system, it is characterised in that：Braking
When, because current vortex is only produced on stator (1.3), consequently only that producing heat on stator (1.3), these heats pass through stator
(1.3) cooling water in internal cooling water channel is taken away；When need not brake, the exciting current in coil (1.2) passes through switch board
(9) disconnect, now coil (1.2) would not also produce the magnetic line of force, and stator (1.3) surface would not produce current vortex, i.e., will not
Produce braking moment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610993687.2A CN106628222A (en) | 2016-11-09 | 2016-11-09 | Aircraft-carrier arresting cable system based on eddy current braking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610993687.2A CN106628222A (en) | 2016-11-09 | 2016-11-09 | Aircraft-carrier arresting cable system based on eddy current braking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106628222A true CN106628222A (en) | 2017-05-10 |
Family
ID=58806502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610993687.2A Pending CN106628222A (en) | 2016-11-09 | 2016-11-09 | Aircraft-carrier arresting cable system based on eddy current braking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106628222A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107117326A (en) * | 2017-06-07 | 2017-09-01 | 清华大学天津高端装备研究院 | System, device and brake are stopped based on the aircraft carrier that hybrid magnets are braked |
| CN109250139A (en) * | 2017-07-16 | 2019-01-22 | 陈培洪 | Flywheel-type electromagnetism arresting system |
| CN109606748A (en) * | 2018-11-23 | 2019-04-12 | 北京蓝箭空间科技有限公司 | Enhancement rocket recovery device and liquid rocket |
| CN110844103A (en) * | 2019-12-23 | 2020-02-28 | 安徽天路航空科技股份有限公司 | Arresting device with buffer function |
| CN113212784A (en) * | 2021-06-28 | 2021-08-06 | 天津大学 | Meeting butt joint device for ferry airship |
| CN117163310A (en) * | 2023-09-01 | 2023-12-05 | 大连长丰实业总公司 | Method for adjusting size of brake band of arresting net equipment |
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|---|---|---|---|---|
| CN102490908A (en) * | 2011-11-29 | 2012-06-13 | 宁波市鄞州发辉机械科技有限公司 | Aircraft carrier barrier cable |
| CN102611277A (en) * | 2012-03-09 | 2012-07-25 | 北京工业大学 | Liquid-cooled eddy current retarder with projecting pole structure |
| CN103482077A (en) * | 2012-06-12 | 2014-01-01 | 济南高达信息技术有限公司 | Variable-torque electromagnetic damping type carrier-based aircraft landing arrester |
| CN106059250A (en) * | 2016-06-01 | 2016-10-26 | 北京工业大学 | Rotor embedded type electromagnetic liquid cooling retarder |
-
2016
- 2016-11-09 CN CN201610993687.2A patent/CN106628222A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102490908A (en) * | 2011-11-29 | 2012-06-13 | 宁波市鄞州发辉机械科技有限公司 | Aircraft carrier barrier cable |
| CN102611277A (en) * | 2012-03-09 | 2012-07-25 | 北京工业大学 | Liquid-cooled eddy current retarder with projecting pole structure |
| CN103482077A (en) * | 2012-06-12 | 2014-01-01 | 济南高达信息技术有限公司 | Variable-torque electromagnetic damping type carrier-based aircraft landing arrester |
| CN106059250A (en) * | 2016-06-01 | 2016-10-26 | 北京工业大学 | Rotor embedded type electromagnetic liquid cooling retarder |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107117326A (en) * | 2017-06-07 | 2017-09-01 | 清华大学天津高端装备研究院 | System, device and brake are stopped based on the aircraft carrier that hybrid magnets are braked |
| CN109250139A (en) * | 2017-07-16 | 2019-01-22 | 陈培洪 | Flywheel-type electromagnetism arresting system |
| CN109606748A (en) * | 2018-11-23 | 2019-04-12 | 北京蓝箭空间科技有限公司 | Enhancement rocket recovery device and liquid rocket |
| CN110844103A (en) * | 2019-12-23 | 2020-02-28 | 安徽天路航空科技股份有限公司 | Arresting device with buffer function |
| CN110844103B (en) * | 2019-12-23 | 2023-12-19 | 安徽天路航空科技股份有限公司 | Blocking device with buffering function |
| CN113212784A (en) * | 2021-06-28 | 2021-08-06 | 天津大学 | Meeting butt joint device for ferry airship |
| CN117163310A (en) * | 2023-09-01 | 2023-12-05 | 大连长丰实业总公司 | Method for adjusting size of brake band of arresting net equipment |
| CN117163310B (en) * | 2023-09-01 | 2024-04-05 | 大连长丰实业总公司 | Method for adjusting size of brake band of arresting net equipment |
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Application publication date: 20170510 |