CN108974989A - A kind of high speed material casting belt feeder for shipment - Google Patents
A kind of high speed material casting belt feeder for shipment Download PDFInfo
- Publication number
- CN108974989A CN108974989A CN201811060522.5A CN201811060522A CN108974989A CN 108974989 A CN108974989 A CN 108974989A CN 201811060522 A CN201811060522 A CN 201811060522A CN 108974989 A CN108974989 A CN 108974989A
- Authority
- CN
- China
- Prior art keywords
- material casting
- belt feeder
- belt
- main body
- casting belt
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G67/00—Loading or unloading vehicles
- B65G67/60—Loading or unloading ships
- B65G67/606—Loading or unloading ships using devices specially adapted for bulk material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
- B65G23/02—Belt- or chain-engaging elements
- B65G23/04—Drums, rollers, or wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G31/00—Mechanical throwing machines for articles or solid materials
- B65G31/02—Mechanical throwing machines for articles or solid materials comprising belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G41/00—Supporting frames or bases for conveyors as a whole, e.g. transportable conveyor frames
- B65G41/001—Supporting frames or bases for conveyors as a whole, e.g. transportable conveyor frames with the conveyor adjustably mounted on the supporting frame or base
- B65G41/002—Pivotably mounted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
- B65G69/04—Spreading out the materials conveyed over the whole surface to be loaded; Trimming heaps of loose materials
- B65G69/0466—Spreading out the materials conveyed over the whole surface to be loaded; Trimming heaps of loose materials with throwing devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Ship Loading And Unloading (AREA)
Abstract
The invention discloses a kind of high speed material casting belt feeders for shipment, including material casting belt feeder main body, pitching and swing mechanism, swing mechanism and main structure；Material casting belt feeder main body includes conveyer belt and pinch roller；Main body mechanism includes intermediate chute；Pitching and swing mechanism include material casting belt feeder pitching hydraulic cylinder, chute oscillating motor and mating hydraulic station；Material casting belt feeder pitching hydraulic cylinder controls entire material casting belt feeder and raises or fall；Chute oscillating motor drives intermediate chute to swing；Material slides by intermediate chute to the conveyer belt with arc-shaped grooves, and the material above it is dished out in conveyor belt high-speed operation；Swing mechanism turns round entire material-throwing device, closes a position and loads onto ship to each local in cabin.Material is dished out to each place of cabin and is closed a position by the present invention, so as to cancel the boom frame telescopic or revolution of ship loader, reduces the cost of ship loader, also reduces main screw lift, and harbour capital construction cost is also reduced.
Description
Technical field
The present invention relates to a kind of material casting belt feeders, and in particular to a kind of high speed material casting belt feeder for shipment.
Background technique
The shipment of ship loader needs one and closes a position process to guarantee the balance of ship, generally use at present telescopic jib or
Cantilever crane turns round to realize, will increase the cost of ship loader in this way.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high speed material casting belt feeder for shipment, by material dish out to
Each place of cabin is closed a position, and so as to cancel the boom frame telescopic or revolution of ship loader, reduces the cost of ship loader,
Main screw lift is also reduced, harbour capital construction cost is also reduced.
In order to solve the above technical problems, the present invention adopts the following technical scheme that: a kind of high speed material casting belt for shipment
Machine, including material casting belt feeder main body, pitching and swing mechanism and main structure；
The material casting belt feeder main body includes conveyer belt and the pinch roller that conveyer belt is pressed into arc-shaped grooves；Main structure includes
Intermediate chute material being delivered on conveyer belt；The pitching and swing mechanism include material casting belt feeder pitching hydraulic cylinder,
Chute oscillating motor and mating hydraulic station；The mating hydraulic station is that material casting belt feeder pitching hydraulic cylinder and chute swing liquid
Cylinder pressure fuel feeding；The material casting belt feeder pitching hydraulic cylinder control material casting belt feeder main body is raised or is fallen；The chute pendulum
Hydrodynamic cylinder pressure controls intermediate chute and swings, and is finely adjusted to the material drop point of shipment；When being closed a position, material casting belt feeder
Material casting belt feeder main body is raised material feeding state by pitching hydraulic cylinder, and belt feeder can be closed a position with material casting, and material is by intermediate
Chute slides to the material casting belt feeder main body with arc-shaped grooves, and the conveyor belt high-speed operation of material casting belt feeder main body will thereon
The material in face is dished out；When being not required to material casting, material casting belt feeder pitching hydraulic cylinder falls belt feeder, belt feeder not material feeding, material
It is directly loaded onto ship without belt feeder.
Further, the high speed material casting belt feeder further includes swing mechanism, and the swing mechanism is by entire material casting
Device is turned round, and is closed a position and is loaded onto ship to each local in cabin.
Further, the swing mechanism includes revolving support and three-in-one driving motor；The revolving support setting
It in the upper flange periphery of main structure, is fixedly connected with main structure, material casting belt feeder main body is connect with main structure, and three close
One driving motor drives revolving support to rotate in upper flange periphery by gear, so that entire material-throwing device be driven to be returned
Turn.
Further, the material casting belt feeder main body include driving roller, it is driven roller, belt conveyor support, pinch roller, defeated
Send band and driving device；The driven roller and the driving roller pass through conveying band connection；Driven roller and driving rolling
Cylinder is mounted on belt conveyor support；The pinch roller is installed on the top of conveyer belt by belt conveyor support；The pinch roller
Press conveyer belt and conveyer belt is pressed into arc-shaped grooves structure in edge；The driving device drives driving roller rotation, thus band
Dynamic driven roller and conveyer belt operation.
Further, the driving device includes driving motor, belt wheel and transmission belt；The output end of the driving motor
It is connect with the belt wheel, driving pulley rotation, the belt wheel is connect by transmission belt with the driving roller, belt wheel rotation
Driving roller rotation is driven by transmission belt.
Further, the material casting belt feeder main body further includes block roller；The conveyer belt is in the two sides of return belt position
2 groups of block rollers are installed.
Further, the main structure includes main body rack, upper flange and intermediate chute；The main body rack
Top is provided with feeding port；The intermediate chute is set to the lower section of feeding port, and top is rotatablely connected with main body rack；It slips
One end of slot oscillating motor is fixed on main body rack, and the other end is hinged on the back side of intermediate chute；Drive intermediate chute tune
Whole material drop point；The lower end of the main body rack is connect with the main axis at driving roller both ends, material casting belt feeder pitching liquid
One end of cylinder pressure is fixed on main body rack, and the other end and belt conveyor support are articulated and connected；The upper flange and ship loader
Discharging chute connection.
Further, high speed material casting belt feeder further includes auxiliary device；The auxiliary device include cable flexing bracket,
Steering and pitching limit assembly and cover.
Beneficial effects of the present invention:
1) present invention, which is dished out material to each place of cabin by high speed material casting belt feeder, closes a position, thus desirable
Disappear the boom frame telescopic or revolution of ship loader, reduces the cost of ship loader, also reduce main screw lift, and harbour capital construction cost is also
Reduction is arrived.
2) due to being pressed into arc-shaped by pinch roller, material reaches at material casting belt feeder circular arc point of contact through intermediate chute, due to throwing
Expect that belt feeder high-speed cruising, material generate very big centrifugal force through circular arc, increase the frictional force of material and belt, avoid material
It skids and deposits when accelerating.
3) angle of pitching and swing mechanism control material casting belt feeder, controls the angle of material casting, to control the distance of material casting
It is far and near.
4) swing mechanism reduces the cart operation of ship loader, makes it that can meet the shipment of all angles in fixed position.
Detailed description of the invention
It, below will be to needed in the embodiment in order to more clearly illustrate the technical solution in the embodiment of the present invention
Attached drawing is simply introduced, it should be apparent that, the accompanying drawings in the following description is only some embodiments recorded in the present invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is overall structure diagram of the invention.
Fig. 2 is side view of the invention.
Fig. 3 is the A direction view of Fig. 2.
Fig. 4 is top view of the invention.
Specific embodiment
Technical solution of the present invention will be clearly and completely described by specific embodiment below.
As shown in Figure 1, for a kind of high speed material casting belt feeder for shipment of the invention, including material casting belt feeder main body 1,
Pitching and swing mechanism 2, swing mechanism 3 and main structure 4.
Material casting belt feeder main body 1 includes driving roller 1-5, driven roller 1-1, belt conveyor support 1-2, pinch roller 1-4, conveying
Band 1-7 and driving device 1-6；Driven roller 1-1 is connected with driving roller 1-5 by conveyer belt 1-7；Driven roller 1-1 and drive
Dynamic roller 1-5 is mounted on belt conveyor support 1-2；Pinch roller 1-4 is installed on the upper of conveyer belt 1-7 by belt conveyor support 1-2
Side；Press conveyer belt 1-7 and conveyer belt 1-7 is pressed into arc-shaped grooves structure in the edge of pinch roller 1-4；Driving device 1-6 includes driving
Motor, belt wheel and transmission belt；The output end of driving motor is connect with belt wheel, driving pulley rotation, and belt wheel is driven by transmission belt
Belt wheel connection, by the center axis connection of shaft coupling and driving roller, belt wheel rotation is driven by transmission belt to be driven driven pulley
Roller 1-5 rotation, so that driven roller 1-1 and conveyer belt 1-7 be driven to run, conveyer belt is run at high speed the material above it
It dishes out, conveyer belt uses flat belt.
To prevent belt deflection, material casting belt feeder main body 1 further includes block roller 1-3；Conveyer belt 1-7 in return belt two
Side position is equipped with 2 groups of block roller 1-3.
Pitching and swing mechanism 2 of the invention includes material casting belt feeder pitching hydraulic cylinder 2-1, chute oscillating motor 2-2
With mating hydraulic station 2-3；Mating hydraulic station 2-3 is material casting belt feeder pitching hydraulic cylinder 2-1 and chute oscillating motor 2-2 confession
Oil；Material casting belt feeder pitching hydraulic cylinder 2-1 controls entire material casting belt feeder and raises or fall；Chute oscillating motor 2-2 driving
Intermediate chute 4-3 swing, when being closed a position, material casting belt feeder pitching hydraulic cylinder by material casting belt feeder main body raise by
Material state, belt feeder can be closed a position with material casting, and material slides by intermediate chute to the material casting belt feeder for having arc-shaped grooves
In main body, the material above it is dished out in the conveyor belt high-speed operation of material casting belt feeder main body；When being not required to material casting, material casting belt
Machine pitching hydraulic cylinder falls belt feeder, and belt feeder not material feeding, material is directly loaded onto ship without belt feeder.
Main body mechanism 4 of the invention includes that main structure 4 includes main body rack 4-2, upper flange 4-1 and intermediate chute 4-
3；Feeding port is provided at the top of the main body rack 4-2；The intermediate chute 4-3 is set to the lower section of feeding port, top
Portion and main body rack 4-2 are rotatablely connected；One end of chute oscillating motor 2-2 is fixed on main body rack 4-2, and the other end is hinged
At the back side of intermediate chute 4-3；Intermediate chute 4-3 is driven to adjust material drop point；The lower end of the main body rack 2 and driving are rolled
The main axis connection at cylinder both ends, one end of material casting belt feeder pitching hydraulic cylinder 2-1 are fixed on main body rack 4-2, the other end
It is articulated and connected with belt conveyor support 1-2；The discharging chute of the upper flange and ship loader connects.
Swing mechanism 3 turns round entire material-throwing device, closes a position and loads onto ship to each local in cabin.Turn-around machine
Structure 3 includes revolving support 3-2 and three-in-one driving motor 3-1；The revolving support 3-2 is set to the top of main structure 4
Flange periphery is fixedly connected with main structure 4, and material casting belt feeder main body 1 is connect with main structure, three-in-one driving motor 3-1
Revolving support 3-2 is driven to rotate in upper flange periphery by gear, so that entire material-throwing device be driven to be turned round.
The effects of to meet rotation power supply and safeguard protection, high speed material casting belt feeder further includes auxiliary device；Described is auxiliary
Helping device includes cable flexing bracket 5-1, steering and pitching limit 5-2 component and cover 5-3.
The working principle of the invention:
For material casting belt feeder due to being pressed into arc-shaped by pinch roller 1-4, material reaches material casting belt feeder circular arc point of contact through intermediate chute 4-3
Place, due to material casting belt feeder high-speed cruising, material generates very big centrifugal force through circular arc, increases the frictional force of material and belt,
It avoids material to skid and deposit when accelerating, material is enabled to can speed up belt most under the effect of powerful frictional force
Big speed.Finally, material is dished out with the high speed equal with belt, reaches each position of cabin, meets requirement of closing a position.It is intermediate
Chute is swung by chute oscillating motor 2-2, can be finely adjusted to the material drop point of shipment.
Material casting belt feeder pitching hydraulic cylinder 2-1 controls the angle of material casting belt feeder, the angle of material casting is controlled, to control material casting
Distance.When normal shipment, without the stage closed a position, material casting belt feeder pitching hydraulic cylinder 2-1 can raise material casting belt feeder
It rises, is not contacted with material, directly loaded onto ship.
Swing mechanism can satisfy ± 160 degree of normal work revolution, and the revolution of the limit ± 170 degree reduces ship loader
Cart operation makes it that can meet the shipment of all angles in fixed position.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to design of the invention
It is defined with range, without departing from the design concept of the invention, ordinary engineering and technical personnel is to this hair in this field
The all variations and modifications that bright technical solution is made should all fall into protection scope of the present invention, claimed skill of the invention
Art content is all documented in technical requirements book.
Claims (8)
1. a kind of high speed material casting belt feeder for shipment, it is characterised in that: including material casting belt feeder main body (1), pitching and pendulum
Motivation structure (2) and main structure (4)；
The material casting belt feeder main body (1) includes conveyer belt (1-7) and the pinch roller that conveyer belt (1-7) is pressed into arc-shaped grooves
(1-4)；Main structure (4) includes the intermediate chute (4-3) being delivered to material on conveyer belt (1-7)；The pitching and pendulum
Motivation structure (2) includes material casting belt feeder pitching hydraulic cylinder (2-1), chute oscillating motor (2-2) and mating hydraulic station；Described
Mating hydraulic station (2-3) is material casting belt feeder pitching hydraulic cylinder (2-1) and chute oscillating motor (2-2) fuel feeding；The throwing
Material belt feeder pitching hydraulic cylinder (2-1) control material casting belt feeder main body is raised or is fallen；The chute oscillating motor (2-2)
It controls intermediate chute (4-3) to swing, the material drop point of shipment is finely adjusted；When being closed a position, material casting belt feeder is bowed
It faces upward hydraulic cylinder (2-1) and material casting belt feeder main body (1) is raised into material feeding state, belt feeder can be closed a position with material casting, material warp
Cross intermediate chute (4-3) slide to arc-shaped grooves material casting belt feeder main body (1) on, material casting belt feeder main body (1) it is defeated
It send and the material above it is dished out with high-speed cruising；When being not required to material casting, material casting belt feeder pitching hydraulic cylinder (2-1) is by belt feeder
It falls, belt feeder not material feeding, material is directly loaded onto ship without belt feeder.
2. a kind of high speed material casting belt feeder for shipment according to claim 1, it is characterised in that: the high speed is thrown
Expect that belt feeder further includes swing mechanism (3), the swing mechanism turns round entire material-throwing device, to each in cabin
It closes a position and loads onto ship in place.
3. a kind of high speed material casting belt feeder for shipment according to claim 1, it is characterised in that: the swing mechanism
It (3) include revolving support (3-2) and three-in-one driving motor (3-1)；The revolving support (3-2) is set to main structure
(4) upper flange periphery is fixedly connected with main structure (4), and material casting belt feeder main body (1) is connect with main structure, and three close
One driving motor (3-1) is rotated by gear driving revolving support (3-2) in upper flange periphery, so that entire material casting be driven to fill
It sets and is turned round.
4. a kind of high speed material casting belt feeder for shipment according to claim 1, it is characterised in that: the material casting skin
Band owner's body (1) includes driving roller (1-5), driven roller (1-1), belt conveyor support (1-2), pinch roller (1-4), conveyer belt
(1-7) and driving device (1-6)；The driven roller (1-1) and the driving roller (1-5) pass through conveyer belt (1-7)
Connection；Driven roller (1-1) and driving roller (1-5) are mounted on belt conveyor support (1-2)；The pinch roller (1-4) is logical
Cross the top that belt conveyor support (1-2) is installed on conveyer belt (1-7)；The edge of the pinch roller (1-4) presses conveyer belt (1-7) will
Conveyer belt (1-7) is pressed into arc-shaped grooves structure；The driving device (1-6) drives driving roller (1-5) rotation, to drive
Driven roller (1-1) and conveyer belt (1-7) operation.
5. a kind of high speed material casting belt feeder for shipment according to claim 4, it is characterised in that: the driving dress
Setting (1-6) includes driving motor, belt wheel and transmission belt；The output end of the driving motor is connect with the belt wheel, drives band
Wheel rotation, the belt wheel are connect by transmission belt with the driving roller (1-5), and belt wheel rotation is driven by transmission belt to be driven
Roller (1-5) rotation.
6. a kind of high speed material casting belt feeder for shipment according to claim 4, it is characterised in that: the material casting skin
Band owner's body (1) further includes block roller (1-3)；The conveyer belt (1-7) is equipped with 2 groups of block roller (1- in two side positions of return belt
3).
7. a kind of high speed material casting belt feeder for shipment according to claim 1, it is characterised in that: the main body knot
Structure (4) includes main body rack (4-2), upper flange (4-1) and intermediate chute (4-3)；
Feeding port is provided at the top of the main body rack (4-2)；The intermediate chute (4-3) is set under feeding port
Side, top are rotatablely connected with main body rack (4-2)；One end of chute oscillating motor (2-2) is fixed on main body rack (4-2)
On, the other end is hinged on the back side of intermediate chute (4-3)；Intermediate chute (4-3) is driven to adjust material drop point；The main body branch
The lower end of frame (2) is connect with the main axis at driving roller both ends, and one end of material casting belt feeder pitching hydraulic cylinder (2-1) is fixed on
On main body rack (4-2), the other end and belt conveyor support (1-2) are articulated and connected；The discharging of upper flange and the ship loader
Chute connection.
8. a kind of high speed material casting belt feeder for shipment according to claim 1, it is characterised in that: high speed material casting belt
Machine further includes auxiliary device；The auxiliary device includes cable flexing bracket (5-1), steering and pitching limit (5-2) component
With cover (5-3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811060522.5A CN108974989A (en) | 2018-09-12 | 2018-09-12 | A kind of high speed material casting belt feeder for shipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811060522.5A CN108974989A (en) | 2018-09-12 | 2018-09-12 | A kind of high speed material casting belt feeder for shipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108974989A true CN108974989A (en) | 2018-12-11 |
Family
ID=64546121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811060522.5A Pending CN108974989A (en) | 2018-09-12 | 2018-09-12 | A kind of high speed material casting belt feeder for shipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108974989A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4968211A (en) * | 1989-08-21 | 1990-11-06 | Ira Compton | Self-propelled loose bulk material slinger vehicle |
| CN2505453Y (en) * | 2001-08-30 | 2002-08-14 | 白彦扩 | Belt conveying throwing machine |
| CN101016118A (en) * | 2007-03-07 | 2007-08-15 | 常熟市诚达港务机械设备厂 | Throwing mechanism for cabin cleaning vehicle |
| CN201592891U (en) * | 2010-01-14 | 2010-09-29 | 中国石油天然气股份有限公司 | Automatic sand delivering machine used for petroleum drilling |
| CN103803258A (en) * | 2014-03-03 | 2014-05-21 | 成都市富瑞达生物技术有限公司 | Small and medium size throwing machine |
-
2018
- 2018-09-12 CN CN201811060522.5A patent/CN108974989A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4968211A (en) * | 1989-08-21 | 1990-11-06 | Ira Compton | Self-propelled loose bulk material slinger vehicle |
| CN2505453Y (en) * | 2001-08-30 | 2002-08-14 | 白彦扩 | Belt conveying throwing machine |
| CN101016118A (en) * | 2007-03-07 | 2007-08-15 | 常熟市诚达港务机械设备厂 | Throwing mechanism for cabin cleaning vehicle |
| CN201592891U (en) * | 2010-01-14 | 2010-09-29 | 中国石油天然气股份有限公司 | Automatic sand delivering machine used for petroleum drilling |
| CN103803258A (en) * | 2014-03-03 | 2014-05-21 | 成都市富瑞达生物技术有限公司 | Small and medium size throwing machine |
Non-Patent Citations (3)
| Title |
|---|
| 于秀芬: "《港口装卸工艺》", 31 December 2003, 大连海事大学出版社 * |
| 杨茅甄: "《现代物流 Logistics 理论与实务》", 31 August 2003, 上海人民出版社 * |
| 水运管理专业联络网统编教材: "《港口装卸工作组织》", 28 February 1983 * |
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Application publication date: 20181211 |