CN109887157A - A kind of environment-friendly type payment mechanism for city bus based on block chain technology - Google Patents
A kind of environment-friendly type payment mechanism for city bus based on block chain technology Download PDFInfo
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- CN109887157A CN109887157A CN201910083906.7A CN201910083906A CN109887157A CN 109887157 A CN109887157 A CN 109887157A CN 201910083906 A CN201910083906 A CN 201910083906A CN 109887157 A CN109887157 A CN 109887157A
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Abstract
The present invention relates to a kind of environment-friendly type payment mechanisms for city bus based on block chain technology, including main body, mounting post and operation panel, the side of the separate operation panel of main body is equipped with energy-saving mechanism, energy-saving mechanism includes support component and adjusting component, support component includes support shaft and solar panels, adjusting component includes first motor, wire spool, bracing wire, sliding block and adjusting rod, the side of the close operation panel of main body is equipped with dedusting mechanism, dedusting mechanism includes shaft, rotary broom and two dust removal assemblies, dust removal assembly includes lifting unit and rotating unit, lifting unit includes the second motor, screw rod and elevator, the environment-friendly type payment mechanism for city bus based on block chain technology passes through energy-saving mechanism, it is generated electricity by solar panels, electric energy is provided to payment mechanism, the energy is saved, improve the feature of environmental protection, pass through dust removal machine Structure can carry out cleaning to operation plate surface, avoid dust from being covered on operation panel, influence to pay effect.
Description
Technical field
The present invention relates to a kind of environment-friendly type payment mechanisms for city bus 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 the payment of city bus
Device.
The public transport payment mechanism of the prior art is typically all to use traditional data encryption mode, it is easy to data be caused to lose
It loses, also, the public transport payment mechanism of the prior art is in running order for a long time, needs to expend a large amount of electric energy, waste of energy,
The feature of environmental protection of payment mechanism is reduced, moreover, the operation panel of existing public transport payment mechanism is chronically exposed to outer, easy quilt
Dust covering influences to pay effect, reduces the practicability of payment mechanism.
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 environment-friendly type payment mechanism for city bus of art.
The technical solution adopted by the present invention to solve the technical problems is: a kind of public for city based on block chain technology
The environment-friendly type payment mechanism of friendship, including main body, mounting post and operation panel, the main body are fixed on the top of mounting post, the behaviour
Make plate to be arranged in main body, processor and memory, the processor and memory electrical connection are equipped in the main body, it is described to deposit
Reservoir receives the block chain data of block chain link point write-in, and stores to block chain data；
The side of the separate operation panel of the main body is equipped with energy-saving mechanism, and the energy-saving mechanism includes support component and adjusting
Component, the adjusting component and support component are sequentially connected；
The support component includes support shaft and solar panels, and one end of the support shaft is fixed on the separate operation of main body
The side of plate, the other end and solar panels of the support shaft are hinged, and the adjusting component and solar panels are sequentially connected；
The adjusting component includes first motor, wire spool, bracing wire, sliding block and adjusting rod, and the first motor is fixed on
The side of the separate operation panel of main body, the first motor and wire spool are sequentially connected, and one end of the bracing wire is arranged in coiling
On disk, the other end of the bracing wire is fixedly connected with a slide block, and one end of the adjusting rod and sliding block are hinged, the adjusting rod it is another
One end is hinged with solar panels, and the first motor is electrically connected with processor；
The side of the close operation panel of the main body be equipped with dedusting mechanism, the dedusting mechanism include shaft, rotary broom and
Two dust removal assemblies, two dust removal assemblies are separately positioned on the two sides of operation panel, the shaft setting two dust removal assemblies it
Between, the dust removal assembly is connect with rotating shaft transmission, and the rotary broom is set in shaft；
The dust removal assembly includes lifting unit and rotating unit, and the separate behaviour of lifting unit is arranged in the rotating unit
Make the side of plate, the lifting unit includes the second motor, screw rod and elevator, and second motor is fixed on the close of main body
The side of operation panel, the screw rod are vertically provided at the lower section of the second motor, and the top transmission of second motor and screw rod connects
Connect, the elevator is set on screw rod, the elevator with the junction of screw rod be equipped with the matched screw thread of screw rod, two
Elevator is respectively sleeved on the both ends of shaft, and second motor is electrically connected with processor.
Preferably, block catenary system is equipped in the processor in order to ensure the safety of equipment inner facility data,
The block catenary system includes that data Layer, network layer, common recognition layer, excitation layer, contract layer and application layer, the block chain data are come
Derived from data Layer.
Preferably, in order to improve the intelligence degree of equipment, the processor is single-chip microcontroller or PLC, the memory
Including memory database and disk database, the memory database and disk database receive the write-in of block chain link point respectively
Block chain data, and block chain data are stored.
Preferably, the adjusting component further includes pilot unit in order to limit the moving direction of sliding block, the guiding is single
Member includes guide rod and two struts, and the both ends of the guide rod pass through the one of the separate operation panel of two struts and main body respectively
Side is fixedly connected, and the sliding block is set on guide rod, and the sliding block is slidably connected with guide rod.
Preferably, the adjusting component further includes spring, one end of the spring and sliding block in order to which band movable slider is mobile
Lower section connection, the other end of the spring connect with the strut of first motor separate in two struts.
Preferably, the lifting unit further includes bearing block, and the bearing block is fixed in order to provide support force to screw rod
In the side of the close operation panel of main body, one end far from the second motor of the screw rod is arranged in bearing block.
Preferably, being coated with anticorrosion galvanizing layer on the screw rod to extend the service life of screw rod.
Preferably, the rotating unit includes gear and rack gear, and the rack gear is fixed in order to enable rotary broom rotates
The side of the close operation panel of main body, the wheel and rack engagement, two gears are respectively sleeved at the both ends of shaft.
Preferably, being coated with lubricating oil on the rack gear in order to enable gear rotation is smooth.
Preferably, in order to enable the precise and stable work of first motor, the first motor are servo motor.
The invention has the advantages that being somebody's turn to do the environment-friendly type payment mechanism for city bus based on block chain technology, adopt
Data storage is carried out with block chain technology, so that data safety degree is high, also, should be based on the public for city of block chain technology
The environment-friendly type payment mechanism of friendship is generated electricity by energy-saving mechanism by solar panels, is provided electric energy to payment mechanism, has been saved energy
Source improves the feature of environmental protection, compared with existing energy-saving mechanism, the angle of the adjustable solar panels of the energy-saving mechanism, so that too
It is positive can plate face sunlight always, improve generating effect, by dedusting mechanism, cleaner can be carried out to operation plate surface
Make, dust is avoided to be covered on operation panel, influences to pay effect, compared with existing dedusting mechanism, which can make
It obtains rotary broom and becomes mobile side rotation, improve clean effect.
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 environment-friendly type payment mechanism for city bus of the invention based on block chain technology
Systematic schematic diagram；
Fig. 2 is the structural representation of the environment-friendly type payment mechanism for city bus of the invention based on block chain technology
Figure；
Fig. 3 is the side view of the environment-friendly type payment mechanism for city bus of the invention based on block chain technology；
Fig. 4 is the dedusting mechanism of the environment-friendly type payment mechanism for city bus of the invention based on block chain technology
Structural schematic diagram；
Fig. 5 is the energy-saving mechanism of the environment-friendly type payment mechanism for city bus of the invention based on block chain technology
Structural schematic diagram；
In figure: 1. mounting posts, 2. main bodys, 3. operation panels, 4. second motors, 5. screw rods, 6. elevators, 7. gears, 8. teeth
Item, 9. shafts, 10. rotary brooms, 11. bearing blocks, 12. first motors, 13. wire spools, 14. bracing wires, 15. sliding blocks, 16. are adjusted
Bar, 17. solar panels, 18. support shafts, 19. guide rods, 20. springs, 21. struts.
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 environment-friendly type payment mechanism for city bus based on block chain technology, including main body 2,
Mounting post 1 and operation panel 3, the main body 2 is interior to be equipped with processor and memory, and the processor and memory are electrically connected, described
Memory receives the block chain data of block chain link point write-in, and stores to block chain data, is equipped in the processor
Block catenary system, the block catenary system include data Layer, network layer, common recognition layer, excitation layer, contract layer and application layer, described
Block chain data source is single-chip microcontroller or PLC in data Layer, the processor, and the memory includes memory database and disk
Database, the memory database and disk database receive the block chain data of block chain link point write-in respectively, and to 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.
By block catenary system, the safety of data storage not only can guarantee, but also also improve the intelligent journey of equipment
Degree.
As shown in Fig. 2, a kind of environment-friendly type payment mechanism for city bus based on block chain technology, the main body 2
It is fixed on the top of mounting post 1, the setting of operation panel 3 is on the body 2；
The environment-friendly type payment mechanism for city bus based on block chain technology passes through solar energy by energy-saving mechanism
Plate 17 generates electricity, and provides electric energy to payment mechanism, has saved the energy, improved the feature of environmental protection, can be to operation panel by dedusting mechanism
3 surfaces carry out cleaning, and dust is avoided to be covered on operation panel 3, influence to pay effect.
The side of the separate operation panel 3 of the main body 2 is equipped with energy-saving mechanism, and the energy-saving mechanism includes support component and tune
Component is saved, the adjusting component and support component are sequentially connected；
The support component includes support shaft 18 and solar panels 17, and one end of the support shaft 18 is fixed on main body 2
Side far from operation panel 3, the other end and solar panels 17 of the support shaft 18 are hinged, the adjusting component and solar panels
17 transmission connections；
The adjusting component includes first motor 12, wire spool 13, bracing wire 14, sliding block 15 and adjusting rod 16, and described first
Motor 12 is fixed on the side of the separate operation panel 3 of main body 2, and the first motor 12 is sequentially connected with wire spool 13, the drawing
One end of line 14 is arranged on wire spool 13, and the other end of the bracing wire 14 is fixedly connected with sliding block 15, the adjusting rod 16
One end and sliding block 15 are hinged, and the other end and solar panels 17 of the adjusting rod 16 are hinged, the first motor 12 and processor
Electrical connection；
When carrying out power generation operation, first motor 12 starts, and wire spool 13 rotates, and tightens or loosen bracing wire 14, thus
Band movable slider 15 moves up and down, and by adjusting rod 16 solar panels 17 is rotated, realizes and adjust 17 angle of solar panels
Function, enables 17 face sunlight of solar panels, improves the effect of power generation, has saved the energy, improves payment mechanism
The feature of environmental protection.
The side of the close operation panel 3 of the main body 2 is equipped with dedusting mechanism, and the dedusting mechanism includes shaft 9, rotary broom
10 and two dust removal assemblies, two dust removal assemblies are separately positioned on the two sides of operation panel 3, and the shaft 9 is arranged in two dedustings
Between component, the dust removal assembly and shaft 9 are sequentially connected, and the rotary broom 10 is set in shaft 9；
The dust removal assembly includes lifting unit and rotating unit, and the separate behaviour of lifting unit is arranged in the rotating unit
Make the side of plate 3, the lifting unit includes the second motor 4, screw rod 5 and elevator 6, and second motor 4 is fixed on main body 2
Close operation panel 3 side, the screw rod 5 is vertically provided at the lower section of the second motor 4, second motor 4 and screw rod 5
Top transmission connection, the elevator 6 is set on screw rod 5, the elevator 6 be equipped with the junction of screw rod 5 and screw rod 5
Matched screw thread, two elevators 6 are respectively sleeved on the both ends of shaft 9, and second motor 4 is electrically connected with processor.
When being dusted work, the second motor 4 starting, screw rod 5 is rotated, and elevator 6 is driven to move down, and drives shaft
9 move down, so that rotary broom 10 carries out cleaning to operation panel 3, while shaft 9 is mobile, drive turning for two sides
Moving cell work, so that rotary broom 10 also rotates while moving down, improves clear so that shaft 9 rotates
Clean effect avoids dust covering operation panel 3, influences to pay effect.
Preferably, the adjusting component further includes pilot unit, the guiding in order to limit the moving direction of sliding block 15
Unit includes guide rod 19 and two struts 21, and it is remote with main body 2 that the both ends of the guide rod 19 pass through two struts 21 respectively
Side from operation panel 3 is fixedly connected, and the sliding block 15 is set on guide rod 19, and the sliding block 15 connects with the sliding of guide rod 19
It connects.By the way that guide rod 19 is arranged, the moving direction of sliding block 15 is limited, the stability when movement of sliding block 15 is improved.
Preferably, the adjusting component further includes spring 20, one end of the spring 20 in order to which band movable slider 15 is mobile
It is connect with the lower section of sliding block 15, the strut 21 in the other end of the spring 20 and two struts 21 far from first motor 12 connects
It connects.When 17 angle of solar panels is adjusted, by tightening bracing wire 14 sliding block 15 is moved up, while extension spring
20, when bracing wire 14 lengthens, in order to set back, band movable slider 15 moves down the spring 20 in tensional state, passes through tune
Pole 16 adjusts the angle of solar panels 17, to realize the function of adjusting 17 angle of solar panels.
Preferably, the lifting unit further includes bearing block 11, the bearing block in order to provide support force to screw rod 5
11 are fixed on the side of the close operation panel 3 of main body 2, and one end far from the second motor 4 of the screw rod 5 is arranged in bearing block 11
It is interior.By the way that bearing block 11 is arranged, in the case where not influencing the rotation of screw rod 5, support force is provided to screw rod 5, improves screw rod 5
Stability when rotation.
Preferably, being coated with anticorrosion galvanizing layer on the screw rod 5 to extend the service life of screw rod 5.
Preferably, the rotating unit includes gear 7 and rack gear 8, the rack gear 8 in order to enable rotary broom 10 rotates
It is fixed on the side of the close operation panel 3 of main body 2, the gear 7 is engaged with rack gear 8, and two gears 7 are respectively sleeved at shaft 9
Both ends.
When being dusted work, lifting unit, which works, is, elevator 6 is driven to move down, thus drive shaft 9 mobile,
So that gear 7 moves on rack gear 8, since rack gear 8 is fixedly installed, so that gear 7 rotates, so that shaft 9 rotates, thus
It realizes rotary broom 10 to rotate while mobile, improves clean effect.
Preferably, being coated with lubricating oil on the rack gear 8, reducing gear 7 and tooth in order to enable gear 7 rotates smoothness
Frictional force between item 8 improves the fluency when movement of gear 7.
Preferably, in order to enable the precise and stable work of first motor 12, the first motor 12 are servo motor.
When carrying out power generation operation, first motor 12 starts, and wire spool 13 rotates, and tightens or loosen bracing wire 14, thus
Band movable slider 15 moves up and down, and by adjusting rod 16 solar panels 17 is rotated, realizes and adjust 17 angle of solar panels
Function, enables 17 face sunlight of solar panels, improves the effect of power generation, has saved the energy, improves payment mechanism
The feature of environmental protection.When being dusted work, the second motor 4 starting, screw rod 5 is rotated, and elevator 6 is driven to move down, band turn
Axis 9 moves down, so that rotary broom 10, which carries out cleaning while shaft 9 is mobile to operation panel 3, drives two sides
Rotating unit work, so that rotary broom 10 also rotates while moving down, improves so that shaft 9 rotates
Clean effect avoids dust covering operation panel 3, influences to pay effect.
Compared with prior art, it is somebody's turn to do the environment-friendly type payment mechanism for city bus based on block chain technology, using area
Block chain technology carries out data storage, so that data safety degree is high, also, should be based on block chain technology for city bus
Environment-friendly type payment mechanism is generated electricity by energy-saving mechanism by solar panels 17, is provided electric energy to payment mechanism, has been saved the energy,
The feature of environmental protection is improved, compared with existing energy-saving mechanism, the angle of the adjustable solar panels 17 of the energy-saving mechanism, so that the sun
Can the face sunlight always of plate 17, improve generating effect, by dedusting mechanism, cleaner can be carried out to 3 surface of operation panel
Make, dust is avoided to be covered on operation panel 3, influences to pay effect, compared with existing dedusting mechanism, which can make
It obtains rotary broom 10 and becomes mobile side rotation, improve clean effect.
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 environment-friendly type payment mechanism for city bus based on block chain technology, including main body (2), mounting post (1)
With operation panel (3), the main body (2) is fixed on the top of mounting post (1), and the operation panel (3) is arranged on main body (2),
It is characterized in that, processor and memory, the processor and memory electrical connection, the memory is equipped in the main body (2)
Receive the block chain data of block chain link point write-in, and block chain data are stored；
The side of the separate operation panel (3) of the main body (2) is equipped with energy-saving mechanism, and the energy-saving mechanism includes support component and tune
Component is saved, the adjusting component and support component are sequentially connected；
The support component includes support shaft (18) and solar panels (17), and one end of the support shaft (18) is fixed on main body
(2) side of separate operation panel (3), the other end of the support shaft (18) and solar panels (17) hingedly, the adjusting group
Part and solar panels (17) are sequentially connected；
The adjusting component includes first motor (12), wire spool (13), bracing wire (14), sliding block (15) and adjusting rod (16), institute
State the side that first motor (12) is fixed on the separate operation panel (3) of main body (2), the first motor (12) and wire spool (13)
One end of transmission connection, the bracing wire (14) is arranged on wire spool (13), the other end of the bracing wire (14) and sliding block (15)
Be fixedly connected, one end of the adjusting rod (16) and sliding block (15) hingedly, the other end and solar panels of the adjusting rod (16)
(17) hingedly, the first motor (12) is electrically connected with processor；
The side of the close operation panel (3) of the main body (2) is equipped with dedusting mechanism, and the dedusting mechanism includes shaft (9), roller
(10) and two dust removal assemblies are brushed, two dust removal assemblies are separately positioned on the two sides of operation panel (3), and shaft (9) setting exists
Between two dust removal assemblies, the dust removal assembly and shaft (9) are sequentially connected, and the rotary broom (10) is set on shaft (9)；
The dust removal assembly includes lifting unit and rotating unit, and the separate operation panel of lifting unit is arranged in the rotating unit
(3) side, the lifting unit include the second motor (4), screw rod (5) and elevator (6), and second motor (4) is fixed
In the side of the close operation panel (3) of main body (2), the screw rod (5) is vertically provided at the lower section of the second motor (4), and described
The top of two motors (4) and screw rod (5) is sequentially connected, and the elevator (6) is set on screw rod (5), the elevator (6)
It is equipped with the junction of screw rod (5) and is respectively sleeved at the both ends of shaft (9) with screw rod (5) matched screw thread, two elevators (6)
On, second motor (4) is electrically connected with processor.
2. as described in claim 1 based on the environment-friendly type payment mechanism for city bus 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 environment-friendly type payment mechanism for city bus 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 environment-friendly type payment mechanism for city bus of block chain technology, feature exists
In the adjusting component further includes pilot unit, and the pilot unit includes guide rod (19) and two struts (21), described to lead
Pass through two struts (21) respectively to the both ends of bar (19) to be fixedly connected with the side of the separate operation panel (3) of main body (2), it is described
Sliding block (15) is set on guide rod (19), and the sliding block (15) is slidably connected with guide rod (19).
5. as described in claim 1 based on the environment-friendly type payment mechanism for city bus of block chain technology, feature exists
In the adjusting component further includes spring (20), and one end of the spring (20) is connect with the lower section of sliding block (15), the spring
(20) the other end is connect with the strut (21) in two struts (21) far from first motor (12).
6. as described in claim 1 based on the environment-friendly type payment mechanism for city bus of block chain technology, feature exists
In the lifting unit further includes bearing block (11), and the bearing block (11) is fixed on the close operation panel (3) of main body (2)
Side, one end setting far from the second motor (4) of the screw rod (5) is in bearing block (11).
7. as described in claim 1 based on the environment-friendly type payment mechanism for city bus of block chain technology, feature exists
In being coated with anticorrosion galvanizing layer on the screw rod (5).
8. as described in claim 1 based on the environment-friendly type payment mechanism for city bus of block chain technology, feature exists
In the rotating unit includes gear (7) and rack gear (8), and the rack gear (8) is fixed on the close operation panel (3) of main body (2)
Side, the gear (7) are engaged with rack gear (8), and two gears (7) are respectively sleeved at the both ends of shaft (9).
9. as claimed in claim 8 based on the environment-friendly type payment mechanism for city bus of block chain technology, feature exists
In being coated with lubricating oil on the rack gear (8).
10. as described in claim 1 based on the environment-friendly type payment mechanism for city bus of block chain technology, feature exists
In the first motor (12) is servo motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910083906.7A CN109887157A (en) | 2019-01-29 | 2019-01-29 | A kind of environment-friendly type payment mechanism for city bus based on block chain technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910083906.7A CN109887157A (en) | 2019-01-29 | 2019-01-29 | A kind of environment-friendly type payment mechanism for city bus based on block chain technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109887157A true CN109887157A (en) | 2019-06-14 |
Family
ID=66927312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910083906.7A Withdrawn CN109887157A (en) | 2019-01-29 | 2019-01-29 | A kind of environment-friendly type payment mechanism for city bus based on block chain technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109887157A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110930522A (en) * | 2019-11-19 | 2020-03-27 | 深圳市乐业科技有限公司 | Shock-absorbing type collection device for urban public transport based on block chain technology |
| CN111199610A (en) * | 2020-01-08 | 2020-05-26 | 赵虎珍 | Bus card swiping device with dust removal function based on block chain technology |
-
2019
- 2019-01-29 CN CN201910083906.7A patent/CN109887157A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110930522A (en) * | 2019-11-19 | 2020-03-27 | 深圳市乐业科技有限公司 | Shock-absorbing type collection device for urban public transport based on block chain technology |
| CN111199610A (en) * | 2020-01-08 | 2020-05-26 | 赵虎珍 | Bus card swiping device with dust removal function based on block chain technology |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190614 |
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| WW01 | Invention patent application withdrawn after publication |