CN109859379A - A kind of multi-functional shared bicycle payment devices based on block chain technology - Google Patents
A kind of multi-functional shared bicycle payment devices based on block chain technology Download PDFInfo
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- CN109859379A CN109859379A CN201910044318.2A CN201910044318A CN109859379A CN 109859379 A CN109859379 A CN 109859379A CN 201910044318 A CN201910044318 A CN 201910044318A CN 109859379 A CN109859379 A CN 109859379A
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Abstract
The present invention relates to a kind of multi-functional shared bicycle payment devices based on block chain technology, including main body, main body is equipped with display screen, protection mechanism and several keys, protection mechanism includes protection board, hinge assembly and two driving assemblies, driving assembly includes lifting unit, elevator and connection unit, clean box is equipped between two elevators, cleaning mechanism is equipped in clean box, cleaning mechanism includes translation component, translation plates and cleaning assemblies, the multi-functional shared bicycle payment devices based on block chain technology, data storage is carried out using block chain technology, so that data safety degree is high, and display screen is protected by protection mechanism, prevent display screen impaired, moreover, in protection mechanism operational process, clean box carries out lifting moving, the water mist on display screen is eliminated by the cleaning mechanism in clean box, make to show The clear two-dimensional code display of display screen facilitates people to scan payment, to improve the practicability of equipment.
Description
Technical field
The present invention relates to a kind of multi-functional shared bicycle payment devices 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, and which includes the payments of shared bicycle to be
System.
The shared bicycle payment devices of the prior art are typically all to use traditional data encryption mode, it is easy to cause to count
According to loss, also, in the shared bicycle payment devices of the prior art, payment two dimensional code is generally exposed directly to device external, and two
Dimension code is subject to scuffing etc. and destroys, while under some wet weathers, two dimensional code surface is easy to haze, these situations are all led
It causes mobile phone not scan the two-dimensional code clearly, influences to pay work, so that people is not available shared bicycle, in turn resulted in existing
Shared bicycle practicability reduce.
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 multi-functional shared bicycle payment devices of art.
The technical solution adopted by the present invention to solve the technical problems is: a kind of multi-functional shared based on block chain technology
Bicycle payment devices, including main body and pedestal, the main body are fixed on the top of pedestal, and the main body is equipped with display screen, protects
Mechanism and several keys are protected, the key is located at the lower section of display screen, is equipped with processor and memory, the place in the main body
Manage device and memory electrical connection, the memory receive block chain link point write-in block chain data, and to block chain data into
Row storage, the display screen and key are electrically connected with processor；
The protection mechanism includes protection board, hinge assembly and two driving assemblies, and the protection board is located at display screen
Top, the protection board are connect by hinge assembly with main body, and two driving assemblies are located at the two sides of display screen, the drive
Dynamic component includes lifting unit, elevator and connection unit, and the lifting unit and elevator are sequentially connected, and the elevator is logical
Connection unit is crossed to connect with protection board；
It is equipped with clean box between two elevators, cleaning mechanism is equipped in the clean box, the cleaning mechanism includes flat
Component, translation plates and cleaning assemblies are moved, the translation plates are located between translation component and cleaning assemblies, and the cleaning assemblies is located at
The side of the close main body of translation plates, the cleaning assemblies include that pressure sensor, spring, pressing plate, roller and two limits are single
Member, the pressure sensor are fixed in translation plates, the side that the pressure sensor passes through the separate main body of spring and pressing plate
The other side of pressing plate is arranged in connection, the roller, and two position-limiting units are located at the two sides of spring, and the spring is in pressure
Contracting state, the pressure sensor are electrically connected with processor, and the position-limiting unit includes limited block and gag lever post, the limited block
It is fixedly connected with the pressing plate by gag lever post, the translation plates are set on gag lever post.
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, 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, in order to drive elevator lifting moving, the lifting unit includes first motor, screw rod and bearing,
The first motor and bearing are each attached in main body, and the first motor is electrically connected with processor, the first motor and silk
The top of bar is sequentially connected, and the bottom end of the screw rod is arranged in bearing, and the elevator is set on screw rod, the elevator
Be equipped with the junction of screw rod and the matched screw thread of screw rod.
Preferably, the hinge assembly includes two hinge units, two hinge units for the ease of protection board rotation
The two sides of protection board are located at, the hinge unit includes side lever and casing, and described sleeve pipe is fixedly connected with main body, the side
One end of bar is arranged in casing, and the other end of the side lever is fixedly connected with protection board.
Preferably, the translation component includes the second motor, first connecting rod, the second company in order to drive translation plates mobile
Bar and two slideways, second motor are fixed in clean box, and second motor is electrically connected with processor, second electricity
Machine and first connecting rod are sequentially connected, and the first connecting rod is hinged by second connecting rod and translation plates, and two slideways are separately fixed at
Top and bottom in clean box, the both ends of the translation plates are slidably connected with two slideways respectively.
Preferably, the connection unit includes strut, first in order to be rotated by the mobile drive protection board of elevator
The shape of lantern ring, frame, the second lantern ring and horizontal axis, the frame is U-shaped, and the both ends of the frame are fixed on protection board, institute
The side that horizontal axis is fixed on the separate clean box of elevator is stated, first lantern ring and the second lantern ring are respectively sleeved at frame and cross
On axis, first lantern ring and the second lantern ring are fixedly connected with strut.
Preferably, one end of the separate elevator of the horizontal axis is equipped with protrusive board in order to avoid the second lantern ring is detached from horizontal axis.
Preferably, the energy conservation and environmental protection in order to realize equipment, the top of the main body is equipped with photovoltaic panel.
Preferably, in order to reinforce the security performance of equipment, the main body is equipped with camera, the camera and processing
Device electrical connection.
The invention has the advantages that the multi-functional shared bicycle payment devices based on block chain technology are somebody's turn to do, using block
Chain technology carries out data storage, so that data safety degree is high, and is protected by protection mechanism to display screen, prevents from showing
Display screen is impaired, compared with existing protection mechanism, the protection mechanism flexible structure, securely and reliably, moreover, in protection mechanism
In operational process, clean box carries out lifting moving, eliminates the water mist on display screen by the cleaning mechanism in clean box, makes to show
Shield clear two-dimensional code display, facilitates people to scan payment, to improve the practicability of equipment.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the system of the block catenary system of the multi-functional shared bicycle payment devices of the invention based on block chain technology
Schematic diagram；
Fig. 2 is the structural schematic diagram of the multi-functional shared bicycle payment devices of the invention based on block chain technology；
Fig. 3 is that the structure of the protection mechanism of the multi-functional shared bicycle payment devices of the invention based on block chain technology is shown
It is intended to；
Fig. 4 is the structural representation of the multi-functional shared bicycle payment devices cleaning mechanism of the invention based on block chain technology
Figure；
Fig. 5 is the portion the A enlarged drawing of Fig. 2；
In figure: 1. main bodys, 2. pedestals, 3. display screens, 4. keys, 5. protection boards, 6. elevators, 7. clean boxes, 8. translations
Plate, 9. pressure sensors, 10. springs, 11. pressing plates, 12. rollers, 13. limited blocks, 14. gag lever posts, 15. first motors, 16.
Bar, 17. bearings, 18. side levers, 19. casings, 20. second motors, 21. first connecting rods, 22. second connecting rods, 23. slideways, 24.
Bar, 25. first lantern rings, 26. frames, 27. second lantern rings, 28. horizontal axis, 29. protrusive boards, 30. photovoltaic panels, 31. cameras.
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 multi-functional shared bicycle payment devices based on block chain technology, including main body 1 and pedestal
2, the main body 1 is interior to be equipped with processor and memory, and the processor and memory electrical connection, the memory receive block chain
The block chain data of node write-in, and block chain data are stored, block catenary system, the area are equipped in the processor
Block 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 number
According to layer, the processor is single-chip microcontroller or PLC, and the memory includes memory database and disk database, the memory number
Receive the block chain data of block chain link point write-in respectively according to library and disk database, and 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 shown in Fig. 2, the main body 1 is fixed on the top of pedestal 2, the main body 1 is equipped with display screen 3, protection mechanism
With several keys 4, the key 4 is located at the lower section of display screen 3, and the display screen 3 and key 4 are electrically connected with processor；
Main body 1 is fixedly mounted on the top of pedestal 2, in main body 1, passes through the display payment two dimensional code of display screen 3, people need
When using shared bicycle, payment work is completed using the payment two dimensional code on mobile phone scanning display screen 3, can be taken shared single
Vehicle protects display screen 3 using protection mechanism, needs to pick up the car in user in order to avoid display screen 3 is by external damage
When, depresses button 4, protection mechanism operation facilitates the payment two dimensional code on people's scanning display screen 3 to carry out payment work.
As shown in figure 3, the protection mechanism includes protection board 5, hinge assembly and two driving assemblies, the protection board 5
Positioned at the top of display screen 3, the protection board 5 is connect by hinge assembly with main body 1, and two driving assemblies are located at display
The two sides of screen 3, the driving component include lifting unit, elevator 6 and connection unit, and the lifting unit and elevator 6 pass
Dynamic connection, the elevator 6 are connect by connection unit with protection board 5；
In protection mechanism, protection board 5 is supported by hinge assembly, facilitates protection board 5 to rotate, in the idleness of equipment
When, protection board 5 straight down, is covered on display screen 3, display screen 3 is protected, when people need to pick up the car, press by
Key 4, processor control the lifting unit starting of 3 two sides of display screen, drive elevator 6 to move up, elevator 6 is single by connection
Member acts on protection board 5, pushes up protection board 5, so that the two dimensional code for facilitating people to scan on display screen 3 carries out payment work
Make, after the completion of payment, lifting unit drives elevator 6 to move down, and drives protection board 5 to rotate down by connection unit, covers
It covers on display screen 3, display screen 3 can then be protected.
As shown in figure 4, being equipped with clean box 7 between two elevators 6, cleaning mechanism is equipped in the clean box 7, it is described clear
Clean mechanism includes translation component, translation plates 8 and cleaning assemblies, and the translation plates 8 are located between translation component and cleaning assemblies, institute
The side that cleaning assemblies is located at the close main body 1 of translation plates 8 is stated, the cleaning assemblies includes pressure sensor 9, spring 10, pressure
Plate 11, roller 12 and two position-limiting units, the pressure sensor 9 are fixed in translation plates 8, and the pressure sensor 9 passes through
Spring 10 is connect with the side of the separate main body 1 of pressing plate 11, and the other side of pressing plate 11 is arranged in the roller 12, and two limits are single
Member is located at the two sides of spring 10, and the spring 10 is in compressive state, and the pressure sensor 9 is electrically connected with processor,
The position-limiting unit includes limited block 13 and gag lever post 14, and the limited block 13 is fixedly connected by gag lever post 14 with pressing plate 11,
The translation plates 8 are set on gag lever post 14.
During elevator 6 carries out lifting moving, drives clean box 7 to do synchronization lifting and move, in clean box 7, cleaning
Mechanism operation, processor control translate component starting, drive translation plates 8 to push cleaning assemblies to main body 1 close to movement, so that clearly
Roller 12 in clean component is contacted with 3 surface of display screen, with the operation of translation component, translation plates 8 and display screen 3 it is horizontal away from
From diminution, to keep spring 10 compressed, pressure sensor 9 detects pressure data, and pressure data is passed to processing, place
It manages device and can determine that the active force between roller 12 and display screen 3, the active force when between the two reach specific according to pressure data
After value, translation component is out of service, and elevator 6 drives clean box 7 to carry out lifting moving at this time, so that translation plates 8 are gone up and down,
Translation plates 8 act on gag lever post 14, and gag lever post 14 does synchronous lifting with roller 12 with dynamic pressure plate 11 so that roller 12 along
The surface of display screen 3 is mobile, removes the water mist on display screen 3, facilitates the clearly display payment two dimensional code of display screen 3, consequently facilitating
People's scanning is paid.
As shown in figure 3, the lifting unit includes first motor 15, screw rod 16 and bearing 17,15 He of first motor
Bearing 17 is each attached in main body 1, and the first motor 15 is electrically connected with processor, the top of the first motor 15 and screw rod 16
The bottom end of end transmission connection, the screw rod 16 is arranged in bearing 17, and the elevator 6 is set on screw rod 16, the lifting
Block 6 be equipped with the junction of screw rod 16 and the matched screw thread of screw rod 16.
Processor controls first motor 15 and starts, and screw rod 16 is driven to rotate under the supporting role of bearing 17, and screw rod 16 is logical
Threaded function is crossed on elevator 6, so that elevator 6 carries out lifting moving along the axis of screw rod 16.
Preferably, the hinge assembly includes two hinge units for the ease of the rotation of protection board 5, two hinged single
Member is located at the two sides of protection board 5, and the hinge unit includes side lever 18 and casing 19, and described sleeve pipe 19 and main body 1 are fixed
One end of connection, the side lever 18 is arranged in casing 19, and the other end of the side lever 18 is fixedly connected with protection board 5.Casing
19 position is fixed, and is rotated convenient for side lever 18 with the axis of casing 19, and then facilitate the rotation of protection board 5.
As shown in figure 4, the translation component includes the second motor 20, first connecting rod 21, second connecting rod 22 and two slideways
23, second motor 20 is fixed in clean box 7, and second motor 20 is electrically connected with processor, second motor 20
It is sequentially connected with first connecting rod 21, the first connecting rod 21 is hinged by second connecting rod 22 and translation plates 8, and two slideways 23 are distinguished
The top and bottom in clean box 7 are fixed on, the both ends of the translation plates 8 are slidably connected with two slideways 23 respectively.
Processor controls the starting of the second motor 20, and first connecting rod 21 is driven to rotate, and first connecting rod 21 passes through second connecting rod 22
It acts in translation plates 8, so that the both ends of translation plates 8 are slided respectively along the slideway 23 of two fixed positions, to drive
Dynamic translation plates 8 are translated.
As shown in figure 5, the connection unit includes strut 24, the first lantern ring 25, frame 26, the second lantern ring 27 and horizontal axis
28, the shape of the frame 26 is U-shaped, and the both ends of the frame 26 are fixed on protection board 5, and the horizontal axis 28 is fixed on lifting
The side of the separate clean box 7 of block 6, first lantern ring 25 and the second lantern ring 27 are respectively sleeved on frame 26 and horizontal axis 28,
First lantern ring 25 and the second lantern ring 27 are fixedly connected with strut 24.
It can relatively rotate, can occur between the second lantern ring 27 and horizontal axis 28 opposite between first lantern ring 25 and frame 26
Rotation drives the height and position of horizontal axis 28 to change, horizontal axis 28 acts on second set when elevator 6 carries out lifting moving
On ring 27, the height and position of the first lantern ring 25 is driven to change by strut 24, and then drive protection board 5 with the axis of casing 19
Line is rotated.
Preferably, one end of the separate elevator 6 of the horizontal axis 28 is set in order to avoid the second lantern ring 27 is detached from horizontal axis 28
There is protrusive board 29.Position of second lantern ring 27 on horizontal axis 28 is limited using protrusive board 29, the second lantern ring 27 is avoided to be detached from horizontal axis 28.
Preferably, the energy conservation and environmental protection in order to realize equipment, the top of the main body 1 is equipped with photovoltaic panel 30.Utilize photovoltaic
Plate 30 can carry out photovoltaic power generation on sunny daytime, the electric energy of equipment operation be provided, to realize the energy conservation and environmental protection of equipment.
Preferably, in order to reinforce the security performance of equipment, the main body 1 is equipped with camera 31, the camera 31
It is electrically connected with processor.The front of main body 1 can be monitored by camera 31, to reinforce the security performance of equipment.
The shared bicycle payment devices when in use, are covered on display screen 3 by protection board 5, prevent display screen 3 by
Damage, when people need to take shared bicycle, depresses button 4, lifting unit drives elevator 6 to move up, and elevator 6 passes through company
Order member acts on protection board 5, so that protection board 5 is rotated up, pays, is rising so that people be facilitated to scan the two-dimensional code
During drop block 6 moves up, in clean box 7, translation component drives translation plates 8 close to main body 1, so that the rolling in cleaning assemblies
Cylinder 12 contacts display screen 3, and with the movement of elevator 6, roller 12 moves on display screen 3, removes the water mist on display screen 3,
Make the clear two-dimensional code display of display screen 3, people is facilitated to pay, to improve the practicability of equipment.
Compared with prior art, the multi-functional shared bicycle payment devices based on block chain technology are somebody's turn to do, using block chain skill
Art carries out data storage, so that data safety degree is high, and protects display screen 3 by protection mechanism, prevents from showing
Screen 3 is impaired, compared with existing protection mechanism, the protection mechanism flexible structure, securely and reliably, moreover, in protection mechanism
In operational process, clean box 7 carries out lifting moving, eliminates the water mist on display screen 3 by the cleaning mechanism in clean box 7, makes
The clear two-dimensional code display of display screen 3 facilitates people to scan payment, to improve the practicability of equipment.
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 multi-functional shared bicycle payment devices based on block chain technology, including main body (1) and pedestal (2), the master
Body (1) is fixed on the top of pedestal (2), and the main body (1) is equipped with display screen (3), protection mechanism and several keys (4), institute
State the lower section that key (4) is located at display screen (3), which is characterized in that processor and memory are equipped in the main body (1), it is described
Processor and memory electrical connection, the memory receive the block chain data of block chain link point write-in, and to block chain data
It is stored, the display screen (3) and key (4) are electrically connected with processor；
The protection mechanism includes protection board (5), hinge assembly and two driving assemblies, and the protection board (5) is located at display screen
(3) top, the protection board (5) are connect by hinge assembly with main body (1), and two driving assemblies are located at display screen
(3) two sides, the driving component include lifting unit, elevator (6) and connection unit, the lifting unit and elevator
(6) it is sequentially connected, the elevator (6) is connect by connection unit with protection board (5)；
Clean box (7) are equipped between two elevators (6), cleaning mechanism, the cleaning mechanism packet are equipped in the clean box (7)
Translation component, translation plates (8) and cleaning assemblies are included, the translation plates (8) are located between translation component and cleaning assemblies, described clear
Clean component is located at the side of the close main body (1) of translation plates (8), and the cleaning assemblies includes pressure sensor (9), spring
(10), pressing plate (11), roller (12) and two position-limiting units, the pressure sensor (9) is fixed on translation plates (8), described
Pressure sensor (9) is connect by spring (10) with the side of the separate main body (1) of pressing plate (11), and roller (12) setting exists
The other side of pressing plate (11), two position-limiting units are located at the two sides of spring (10), and the spring (10) is in compressive state,
The pressure sensor (9) is electrically connected with processor, and the position-limiting unit includes limited block (13) and gag lever post (14), the limit
Position block (13) is fixedly connected by gag lever post (14) with pressing plate (11), and the translation plates (8) are set on gag lever post (14).
2. the multi-functional shared bicycle payment devices based on block chain technology as described in claim 1, which is characterized in that described
Be equipped with block catenary system in 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. the multi-functional shared bicycle payment devices based on block chain technology as described in claim 1, which is characterized in that described
Processor is single-chip microcontroller or PLC, and the memory includes memory database and disk database, the memory database and disk
Database receives the block chain data of block chain link point write-in respectively, and stores to block chain data.
4. the multi-functional shared bicycle payment devices based on block chain technology as described in claim 1, which is characterized in that described
Lifting unit includes first motor (15), screw rod (16) and bearing (17), and the first motor (15) and bearing (17) are fixed
On main body (1), the first motor (15) is electrically connected with processor, and the top of the first motor (15) and screw rod (16) passes
Dynamic connection, in bearing (17), the elevator (6) is set on screw rod (16), described for the bottom end setting of the screw rod (16)
Elevator (6) be equipped with the junction of screw rod (16) and screw rod (16) matched screw thread.
5. the multi-functional shared bicycle payment devices based on block chain technology as described in claim 1, which is characterized in that described
Hinge assembly includes two hinge units, and two hinge units are located at the two sides of protection board (5), and the hinge unit includes
Side lever (18) and casing (19), described sleeve pipe (19) are fixedly connected with main body (1), and one end of the side lever (18) is arranged in casing
(19) in, the other end of the side lever (18) is fixedly connected with protection board (5).
6. the multi-functional shared bicycle payment devices based on block chain technology as described in claim 1, which is characterized in that described
Translating component includes the second motor (20), first connecting rod (21), second connecting rod (22) and two slideways (23), second motor
(20) it is fixed in clean box (7), second motor (20) is electrically connected with processor, and second motor (20) connects with first
Bar (21) transmission connection, the first connecting rod (21) hingedly by second connecting rod (22) and translation plates (8), divide by two slideways (23)
It is not fixed on the top and bottom in clean box (7), the both ends of the translation plates (8) connect with two slideway (23) slidings respectively
It connects.
7. the multi-functional shared bicycle payment devices based on block chain technology as described in claim 1, which is characterized in that described
Connection unit includes strut (24), the first lantern ring (25), frame (26), the second lantern ring (27) and horizontal axis (28), the frame
(26) shape is U-shaped, and the both ends of the frame (26) are fixed on protection board (5), and the horizontal axis (28) is fixed on elevator
(6) side of separate clean box (7), first lantern ring (25) and the second lantern ring (27) are respectively sleeved at frame (26) and cross
On axis (28), first lantern ring (25) and the second lantern ring (27) are fixedly connected with strut (24).
8. the multi-functional shared bicycle payment devices based on block chain technology as claimed in claim 7, which is characterized in that described
One end of the separate elevator (6) of horizontal axis (28) is equipped with protrusive board (29).
9. the multi-functional shared bicycle payment devices based on block chain technology as described in claim 1, which is characterized in that described
The top of main body (1) is equipped with photovoltaic panel (30).
10. the multi-functional shared bicycle payment devices based on block chain technology as described in claim 1, which is characterized in that institute
Main body (1) is stated equipped with camera (31), the camera (31) is electrically connected with processor.
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| CN201910044318.2A CN109859379A (en) | 2019-01-17 | 2019-01-17 | A kind of multi-functional shared bicycle payment devices based on block chain technology |
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|---|---|---|---|---|
| CN112669535A (en) * | 2020-12-11 | 2021-04-16 | 安徽美博智能科技有限公司 | Sharing air conditioner intelligent time control payment system |
| CN112907835A (en) * | 2021-01-19 | 2021-06-04 | 咸阳师范学院 | Tourism information internet electronic map display device |
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Application publication date: 20190607 |