CN109949426A - A kind of safety-type ticket-selling device for rail traffic based on block chain technology - Google Patents
A kind of safety-type ticket-selling device for rail traffic based on block chain technology Download PDFInfo
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- CN109949426A CN109949426A CN201910185371.4A CN201910185371A CN109949426A CN 109949426 A CN109949426 A CN 109949426A CN 201910185371 A CN201910185371 A CN 201910185371A CN 109949426 A CN109949426 A CN 109949426A
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Abstract
The present invention relates to a kind of safety-type ticket-selling devices for rail traffic based on block chain technology, including main body, display screen and operation panel, the display screen and operation panel are arranged in main body, the lower section of display screen is arranged in the operation panel, processor and memory are equipped in the main body, the processor and memory electrical connection, the memory receives the block chain data of block chain link point write-in, and block chain data are stored, the main body is equipped with protection mechanism, the protection mechanism includes protective cover and two transmission components, energy-saving mechanism is additionally provided in the main body, the energy-saving mechanism includes two movable plates and two Power Components, the safety-type ticket-selling device for rail traffic based on block chain technology improves safety by protection mechanism, moreover, section has also been reached by energy-saving mechanism It can effect.
Description
Technical field
The present invention relates to a kind of safety-type ticket-selling devices for rail traffic based on block chain technology.
Background technique
Block chain technology is that algorithm of knowing together with storing data, using distributed node is verified using block linked data structure
Guarantee the safety of data transmission and access with more new data, in the way of cryptography, using by automatized script generation to generate
The intelligent contract of code composition programs the completely new distributed basis framework and calculation of one kind with operation data, is distributed
The new application mode of the computer technologies such as data storage, point-to-point transmission, common recognition mechanism, Encryption Algorithm.
The data safety degree of block chain technology is higher, and application is also very extensive, wherein just including ticket machine field, ticketing
Machine system is by micro computer control, and powerful, flexibly, stability is high for setting, has two-dimensional bar code printing, contactless card identification, beats
The functions such as bill, bank card identification are printed, the rail traffics such as subway and public transport field are mainly used for.
The ticket machine of the prior art is typically all to use traditional data encryption mode, it is easy to loss of data is caused, and
And the ticket machine of the prior art in terms of safety there are problem, existing ticket machine in use, around ticket machine
There is not safety device, the payment for easily making criminal peep user is close, reduces safety, moreover, existing
Ticket machine be not used during be also constantly in open state, cause the waste of electric energy, be unfavorable for energy conservation.
Summary of the invention
The technical problem to be solved by the present invention is for overcome the deficiencies in the prior art, providing a kind of based on block chain skill
The safety-type ticket-selling device for rail traffic of art.
The technical solution adopted by the present invention to solve the technical problems is: a kind of handing over for track based on block chain technology
Logical safety-type ticket-selling device, including main body, display screen and operation panel, the display screen and operation panel are arranged at main body
On, the operation panel is arranged in the lower section of display screen, is equipped with processor and memory in the main body, the processor and deposits
Reservoir electrical connection, the memory receive the block chain data of block chain link point write-in, and store to block chain data；
The main body is equipped with protection mechanism, and the protection mechanism includes protective cover and two transmission components, the protection
The transversal cross-section shape of cover is circular arc, face where two endpoints of the circular cross-section of the protective cover respectively with two transmission groups
Part transmission connection, two transmission components are separately positioned on the two sides of main body, and the center of circle of the circular cross-section of the protective cover is towards close
The top of display screen is arranged in main direction setting, the protective cover；
It is additionally provided with energy-saving mechanism in the main body, the energy-saving mechanism includes two movable plates and two Power Components, and two
A movable plate is vertically provided at the two sides of display screen respectively, and the side of the close main body of the movable plate is equipped with solar panels, and two
A Power Component is separately positioned on above and below display screen, and the Power Component and movable plate are sequentially connected.
Preferably, being equipped with block catenary system, the block in the processor to improve the safety of data storage
Catenary system includes data Layer, network layer, common recognition layer, excitation layer, contract layer and application layer, and the block chain data source is in data
Layer.
Preferably, the processor is single-chip microcontroller or PLC, and the memory includes interior in order to improve the degree of automation
Deposit data library and disk database, the memory database and disk database receive the block chain of block chain link point write-in respectively
Data, and block chain data are stored.
Preferably, the transmission component includes driving unit and gear unit, the biography in order to drive protective cover to go up and down
Moving cell includes transmission case, guide rod, drive block, link block and fixed block, and the transmission case is fixed in main body, and the guide rod is perpendicular
To being arranged in transmission case, the top of the guide rod is fixed on the top in transmission case, and the fixed block is fixed on the bottom of guide rod
End, the drive block are set on guide rod, and the top of fixed block, the close protective cover of the transmission case is arranged in the drive block
Side be equipped with sliding slot, the sliding slot is vertically arranged, and the link block is arranged in sliding slot, the drive block by link block with
Protective cover is fixedly connected.
Preferably, the gear unit includes driving motor, roller, connecting line and determines in order to drive drive block to go up and down
Pulley, the driving motor are fixed on the inner wall of transmission case, and the lower section of fixed block, the driving is arranged in the driving motor
Motor is connect with drum drive, and the axis horizontal setting of the roller, one end of the connecting line is fixed on roller, the company
The other end of wiring is fixed on the top of drive block around fixed pulley, and for the connecting line on roller, the fixed pulley is solid
It is scheduled on main intracorporal top, the lower section of fixed pulley is arranged in the drive block.
Preferably, the guide rod is equipped with limited block in order to avoid drive block and fixed pulley bump against, the limited block is solid
Be scheduled on the side of the separate connecting line of guide rod, the top of the limited block and drive block against.
Preferably, the Power Component includes that power unit and two connections are single in order to drive two movable plates mobile
Member, the power unit include headstock, power motor, driving bevel gear, driven wheel of differential and transmission shaft, and the headstock is solid
It being scheduled in main body, the power motor is fixed on the inner wall of headstock, and the power motor and driving bevel gear are sequentially connected,
The driving bevel gear is engaged with driven wheel of differential, and the driven wheel of differential is mounted on transmission shaft, and the transmission shaft level is set
It sets in headstock, the side of the close display screen of the headstock is equipped with link slot, and the connection unit and movable plate are one by one
Corresponding, the both ends of the transmission shaft pass through two connection units respectively and two movable plates are sequentially connected.
Preferably, the connection unit includes screw rod and sliding block, the screw rod in order to realize movable plate mobile function
Horizontally disposed with transmission shaft, one end of the screw rod is connected and fixed with transmission shaft to be connect, and the inner wall of the headstock is set in silk
The other end of bar, the sliding block are set on screw rod, the sliding block with the junction of screw rod be equipped with the matched screw thread of screw rod,
The sliding block is arranged in link slot, and the sliding block is fixedly connected with movable plate.
Preferably, in order to avoid two movable plate synchronizing movings, the thread rotary orientation of two screw rods is opposite.
Preferably, in order to realize intelligence, the main body is equipped with infrared sensor and switch, the switch setting
In the side of operation panel, the infrared sensor, switch, driving motor and power motor are electrically connected with processor.
The invention has the advantages that being somebody's turn to do the safety-type ticket-selling device for rail traffic based on block chain technology, adopt
Data storage is carried out with block chain technology, so that data safety degree is high, also, should handing over for track based on block chain technology
Logical safety-type ticket-selling device improves safety by protection mechanism, compared with existing protection mechanism, the protection mechanism knot
Structure is simple, and cost is lower, moreover, has also reached energy-saving effect by energy-saving mechanism, should compared with existing energy-saving mechanism
Energy-saving mechanism is also equipped with dust-proof function, and structure is more ingenious, and practicability is higher.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the block catenary system of the safety-type ticket-selling device for rail traffic of the invention based on block chain technology
Systematic schematic diagram；
Fig. 2 is the structural representation of the safety-type ticket-selling device for rail traffic of the invention based on block chain technology
Figure；
Fig. 3 is the cross-sectional view of the safety-type ticket-selling device for rail traffic of the invention based on block chain technology；
Fig. 4 is the portion the A enlarged drawing of Fig. 3；
Fig. 5 is the portion the B enlarged drawing of Fig. 3；
Fig. 6 is the portion the C enlarged drawing of Fig. 3；
In figure: 1. main bodys, 2. display screens, 3. operation panels, 4. protective covers, 5. movable plates, 6. transmission cases, 7. guide rods, 8.
Drive block, 9. link blocks, 10. fixed blocks, 11. driving motors, 12. rollers, 13. connecting lines, 14. fixed pulleys, 15. limited blocks,
16. headstock, 17. power motors, 18. driving bevel gears, 19. driven wheel of differential, 20. transmission shafts, 21. screw rods, 22. sliding blocks,
23. switch.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
As shown in Figure 1, a kind of safety-type ticket-selling device for rail traffic based on block chain technology, including main body 1,
Display screen 2 and operation panel 3, the main body 1 is interior to be equipped with processor and memory, the processor and memory electrical connection, institute
It states memory and receives the block chain data of block chain link point write-in, and block chain data are stored, set in the processor
There is block catenary system, the block catenary system includes data Layer, network layer, common recognition layer, excitation layer, contract layer and application layer, institute
Block chain data source is stated in data Layer, the processor is single-chip microcontroller or PLC, and the memory includes memory database and magnetic
Disk database, the memory database and disk database receive the block chain data of block chain link point write-in respectively, and to area
Block chain data are stored.
In fact, processor is mainly used for handling data, and memory is stored for data, herein:
Data Layer encapsulates bottom data block and the technologies such as relevant data encryption and timestamp；
In fact, the block chain data that memory database and disk database receive or store come from data
Layer.
Network layer then includes distributed networking mechanism, data dissemination mechanism and data authentication mechanism etc.；
All kinds of common recognition algorithms of common recognition layer predominant package network node；
Economic factor is integrated into block chain technical system by excitation layer, main issuing mechanism including economic incentives and
Distribution mechanism etc.；
All kinds of scripts of contract layer predominant package, algorithm and intelligent contract, are the bases of block chain programmable features；
Application layer then encapsulates the various application scenarios and case of block chain.
As Figure 2-3, the display screen 2 and operation panel 3 are respectively provided on the body 1, and the setting of operation panel 3 exists
The lower section of display screen 2；
The main body 1 is equipped with protection mechanism, and the protection mechanism includes protective cover 4 and two transmission components, the guarantor
The transversal cross-section shape of shield 4 is circular arc, and the face where two endpoints of the circular cross-section of the protective cover 4 is passed with two respectively
Dynamic component transmission connection, two transmission components are separately positioned on the two sides of main body 1, the center of circle of the circular cross-section of the protective cover 4
It is arranged towards close to 1 direction of main body, the top of display screen 2 is arranged in the protective cover 4；
Energy-saving mechanism is additionally provided in the main body 1, the energy-saving mechanism includes two movable plates 5 and two Power Components,
Two movable plates 5 are vertically provided at the two sides of display screen 2 respectively, and the side of the close main body 1 of the movable plate 5 is equipped with solar energy
Plate, two Power Components are separately positioned on above and below display screen 2, and the Power Component and movable plate 5 are sequentially connected.
When user needs booking, move down protective cover 4 by transmission component, so that surrounding protective cover 4 makes
User can block user by protective cover 4, user is avoided to be peeped by criminal to disbursement letter in payment process
Breath, improve safety, after user's booking, run by Power Component, make two movable plates 5 close to be moved to
Stop rearward, the function of blocking display screen 2 is realized by two movable plates 5, achieved the effect that dust-proof, passes through movable plate 5
On solar panels absorb display screen 2 on light realize photovoltaic power generation, reached energy-efficient effect.
As shown in figure 4, the transmission component includes driving unit and gear unit, the gear unit include transmission case 6,
Guide rod 7, drive block 8, link block 9 and fixed block 10, the transmission case 6 is fixed on the body 1, and the guide rod 7 is vertically provided at
In transmission case 6, the top of the guide rod 7 is fixed on the top in transmission case 6, and the fixed block 10 is fixed on the bottom end of guide rod 7,
The drive block 8 is set on guide rod 7, and the top of fixed block 10, the close guarantor of the transmission case 6 is arranged in the drive block 8
The side of shield 4 is equipped with sliding slot, and the sliding slot is vertically arranged, and the link block 9 is arranged in sliding slot, and the drive block 8 passes through
Link block 9 is fixedly connected with protective cover 4, when there is user to need booking, is run by driving unit, and drive block 8 is being led
It is moved down on bar 7, until drive block 8 and fixed block 10 are against stopping, the movement of drive block 8 drives protection by link block 9
Cover 4 moves down, and realizes the function that driving protective cover 4 is gone up and down.
As shown in figure 5, the gear unit includes driving motor 11, roller 12, connecting line 13 and fixed pulley 14, the drive
Dynamic motor 11 is fixed on the inner wall of transmission case 6, and the lower section of fixed block 10, the driving motor is arranged in the driving motor 11
11 are sequentially connected with roller 12, and the axis horizontal setting of the roller 12, one end of the connecting line 13 is fixed on roller 12,
The other end of the connecting line 13 is fixed on the top of drive block 8 around fixed pulley 14, and the connecting line 13 is wound on roller 12
On, the fixed pulley 14 is fixed on the top in main body 1, and the lower section of fixed pulley 14 is arranged in the drive block 8, when protective cover 4
It when needing to decline, is run by driving motor 11, rotates roller 12, driven connecting line 13 to unclamp, make drive block 8 in gravity
The lower decline of effect, when protective cover 4 needs to rise, by 11 inverted running of driving motor, rotates backward roller 12, to make
Connecting line 13 pulls drive block 8 to move up, and protective cover 4 is driven to rise, and during protective cover 4 declines, passes through connecting line
When 13 transmission can collide to avoid protective cover 4 and user, user is further improved safety by rigid shock.
Preferably, the guide rod 7 is equipped with limited block 15, the limit in order to avoid drive block 8 and fixed pulley 14 bump against
Position block 15 is fixed on the side of separate the connecting line 13 of guide rod 7, and the top of the limited block 15 and drive block 8 is against passing through limit
Position block 15 can transition be mobile and drive block 8 and fixed pulley 14 is caused to bump against in uphill process to avoid drive block 8.
As shown in fig. 6, the Power Component includes power unit and two connection units, the power unit includes power
Case 16, power motor 17, driving bevel gear 18, driven wheel of differential 19 and transmission shaft 20, the headstock 16 are fixed on main body 1
On, the power motor 17 is fixed on the inner wall of headstock 16, and the power motor 17 is sequentially connected with driving bevel gear 18,
The driving bevel gear 18 is engaged with driven wheel of differential 19, and the driven wheel of differential 19 is mounted on transmission shaft 20, the transmission
Axis 20 is horizontally set in headstock 16, and the side of the close display screen 2 of the headstock 16 is equipped with link slot, and the connection is single
Member is corresponded with movable plate 5, and the both ends of the transmission shaft 20 pass through two connection units respectively and two transmissions of movable plate 5 connect
It connects, after user's booking, power motor 17 is run, and is made driving bevel gear 18 that driven wheel of differential 19 be driven to rotate, is passed through
The rotation of driven wheel of differential 19 rotates transmission shaft 20, and the rotation of transmission shaft 20 keeps two movable plates 5 close by connection unit
It is mobile, realize the mobile function of driving movable plate 5.
Preferably, the connection unit includes screw rod 21 and sliding block 22, institute in order to realize the mobile function of movable plate 5
It states screw rod 21 and transmission shaft 20 is horizontally disposed, one end of the screw rod 21 is connected and fixed with transmission shaft 20 to be connect, the headstock
16 inner wall is set in the other end of screw rod 21, and the sliding block 22 is set on screw rod 21, the sliding block 22 with screw rod 21
Junction is equipped with to be arranged in link slot with the matched screw thread of screw rod 21, the sliding block 22, and the sliding block 22 and movable plate 5 are fixed
Connection rotates screw rod 21 by the rotation of transmission shaft 20, so that sliding block 22 be made to move on screw rod 21, passes through the shifting of sliding block 22
It is dynamic to drive movable plate 5 mobile, realize the mobile function of movable plate 5.
Preferably, the thread rotary orientation of two screw rods 21 is on the contrary, work as screw rod in order to avoid two 5 synchronizing movings of movable plate
When 21 thread rotary orientation is identical, it will lead to two movable plates 5 to same direction movement, display screen 2 can not be blocked.
Preferably, in order to realize intelligence, the main body 1 is equipped with infrared sensor and switch 23, the switch
23 are arranged in the side of operation panel 3, the infrared sensor, switch 23, driving motor 11 and power motor 17 with place
Device electrical connection is managed, when user needs before booking station to main body 1, two movable plates 5 are in the shape for blocking display screen 2 at this time
State, infrared ray sensing detect signal and pass to processor, and processor controls driving motor 11 and power motor 17 is run, and make
Protective cover 4 moves down, and makes two movable plates 5 far from movement, and after user's booking, user presses switch 23,
Switch 23 issues signal to processor, and processor controls driving motor 11 and 17 inverted running of power motor, makes protective cover 4 and moves
Movable plate 5 resets, and realizes intelligence.
The safety-type ticket-selling device for rail traffic based on block chain technology is improved by the control lifting of protective cover 4
Safety, avoids the user from being peeped by criminal to payment information in payment process, also passes through Power Component control and moves
Movable plate 5 is mobile, to make solar panels that the light on display screen 2 can be absorbed, realizes photovoltaic power generation, has reached energy-efficient effect
Fruit can also prevent dust from falling on the display screen 2, achieve the effect that dust-proof by movable plate 5.
Compared with prior art, it is somebody's turn to do the safety-type ticket-selling device for rail traffic based on block chain technology and passes through protection
Mechanism improves safety, and compared with existing protection mechanism, the protection mechanism structure is simple, and cost is lower, moreover, also
Energy-saving effect is reached by energy-saving mechanism, compared with existing energy-saving mechanism, which is also equipped with dust-proof function, knot
Structure is more ingenious, and practicability is higher.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
1. a kind of safety-type ticket-selling device for rail traffic based on block chain technology, including main body (1), display screen (2)
With operation panel (3), the display screen (2) and operation panel (3) are arranged on main body (1), operation panel (3) setting
In the lower section of display screen (2), which is characterized in that be equipped with processor and memory, the processor and storage in the main body (1)
Device electrical connection, the memory receive the block chain data of block chain link point write-in, and store to block chain data；
The main body (1) is equipped with protection mechanism, and the protection mechanism includes protective cover (4) and two transmission components, the guarantor
The transversal cross-section shape of shield (4) is circular arc, and face where two endpoints of the circular cross-section of the protective cover (4) is respectively with two
A transmission component transmission connection, two transmission components are separately positioned on the two sides of main body (1), and the circular arc of the protective cover (4) is cut
The center of circle in face is arranged towards close to main body (1) direction, top of protective cover (4) setting in display screen (2)；
Energy-saving mechanism is additionally provided on the main body (1), the energy-saving mechanism includes two movable plates (5) and two Power Components,
Two movable plates (5) are vertically provided at the two sides of display screen (2) respectively, and the side of the close main body (1) of the movable plate (5) is set
There are solar panels, two Power Components are separately positioned on above and below display screen (2), the Power Component and movable plate
(5) it is sequentially connected.
2. as described in claim 1 based on the safety-type ticket-selling device for rail traffic of block chain technology, feature exists
In being equipped with block catenary system in, the processor, the block catenary system include data Layer, network layer, common recognition layer, excitation layer,
Contract layer and application layer, the block chain data source is in data Layer.
3. as described in claim 1 based on the safety-type ticket-selling device for rail traffic of block chain technology, feature exists
In the processor is single-chip microcontroller or PLC, and the memory includes memory database and disk database, the internal storage data
Library and disk database receive the block chain data of block chain link point write-in respectively, and store to block chain data.
4. as described in claim 1 based on the safety-type ticket-selling device for rail traffic of block chain technology, feature exists
In the transmission component includes driving unit and gear unit, and the gear unit includes transmission case (6), guide rod (7), transmission
Block (8), link block (9) and fixed block (10), the transmission case (6) are fixed on main body (1), and the guide rod (7) is vertically arranged
In transmission case (6), the top of the guide rod (7) is fixed on the top in transmission case (6), and the fixed block (10), which is fixed on, leads
The bottom end of bar (7), the drive block (8) are set on guide rod (7), and the drive block (8) is arranged in the top of fixed block (10),
The side of the close protective cover (4) of the transmission case (6) is equipped with sliding slot, and the sliding slot is vertically arranged, link block (9) setting
In sliding slot, the drive block (8) is fixedly connected by link block (9) with protective cover (4).
5. as claimed in claim 4 based on the safety-type ticket-selling device for rail traffic of block chain technology, feature exists
In the gear unit includes driving motor (11), roller (12), connecting line (13) and fixed pulley (14), the driving motor
(11) it is fixed on the inner wall of transmission case (6), driving motor (11) setting is in the lower section of fixed block (10), the driving electricity
Machine (11) and roller (12) are sequentially connected, and the axis horizontal setting of the roller (12), one end of the connecting line (13) is fixed
On roller (12), the other end of the connecting line (13) is fixed on the top of drive block (8), the company around fixed pulley (14)
On roller (12), the fixed pulley (14) is fixed on the top in main body (1) for wiring (13), and the drive block (8) sets
Set the lower section in fixed pulley (14).
6. as claimed in claim 5 based on the safety-type ticket-selling device for rail traffic of block chain technology, feature exists
In the guide rod (7) is equipped with limited block (15), and the limited block (15) is fixed on the separate connecting line (13) of guide rod (7)
Side, the tops of the limited block (15) and drive block (8) against.
7. as described in claim 1 based on the safety-type ticket-selling device for rail traffic of block chain technology, feature exists
In the Power Component includes power unit and two connection units, and the power unit includes headstock (16), power motor
(17), driving bevel gear (18), driven wheel of differential (19) and transmission shaft (20), the headstock (16) are fixed on main body (1),
The power motor (17) is fixed on the inner wall of headstock (16), and the power motor (17) and driving bevel gear (18) are driven
Connection, the driving bevel gear (18) are engaged with driven wheel of differential (19), and the driven wheel of differential (19) is mounted on transmission shaft
(20) on, the transmission shaft (20) is horizontally set in headstock (16), and the one of the close display screen (2) of the headstock (16)
Side is equipped with link slot, and the connection unit and movable plate (5) correspond, and the both ends of the transmission shaft (20) pass through two respectively
Connection unit and two movable plates (5) are sequentially connected.
8. as claimed in claim 7 based on the safety-type ticket-selling device for rail traffic of block chain technology, feature exists
In the connection unit includes screw rod (21) and sliding block (22), and the screw rod (21) and transmission shaft (20) are horizontally disposed, the silk
One end of bar (21) is connected and fixed with transmission shaft (20) and connect, and the inner wall of the headstock (16) is set in the another of screw rod (21)
End, the sliding block (22) is set on screw rod (21), the sliding block (22) be equipped with the junction of screw rod (21) and screw rod
(21) matched screw thread, the sliding block (22) are arranged in link slot, and the sliding block (22) is fixedly connected with movable plate (5).
9. as claimed in claim 8 based on the safety-type ticket-selling device for rail traffic of block chain technology, feature exists
In the thread rotary orientation of two screw rods (21) is opposite.
10. as described in claim 1 based on the safety-type ticket-selling device for rail traffic of block chain technology, feature exists
In the main body (1) is equipped with infrared sensor and switch (23), and the switch (23) is arranged the one of operation panel (3)
Side, the infrared sensor, switch (23), driving motor (11) and power motor (17) are electrically connected with processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910185371.4A CN109949426A (en) | 2019-03-12 | 2019-03-12 | A kind of safety-type ticket-selling device for rail traffic based on block chain technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910185371.4A CN109949426A (en) | 2019-03-12 | 2019-03-12 | A kind of safety-type ticket-selling device for rail traffic based on block chain technology |
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| CN109949426A true CN109949426A (en) | 2019-06-28 |
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ID=67008769
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| CN201910185371.4A Withdrawn CN109949426A (en) | 2019-03-12 | 2019-03-12 | A kind of safety-type ticket-selling device for rail traffic based on block chain technology |
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