CN108640014A - A kind of clamping lifting gear for parking robot platform - Google Patents
A kind of clamping lifting gear for parking robot platform Download PDFInfo
- Publication number
- CN108640014A CN108640014A CN201810397501.6A CN201810397501A CN108640014A CN 108640014 A CN108640014 A CN 108640014A CN 201810397501 A CN201810397501 A CN 201810397501A CN 108640014 A CN108640014 A CN 108640014A
- Authority
- CN
- China
- Prior art keywords
- clamping
- hydraulic cylinder
- lifting
- fixed
- loop bar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
- B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/28—Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
Abstract
The invention discloses a kind of clamping lifting gears for parking robot platform,Including automatic parking platform,Lifting body and grip main body,The automatic parking mesa base is equipped with movable pulley,It is fixed on the automatic parking platform medial surface that there are four transition driving hydraulic cylinders,One group of traversing loop bar is installed on each transition driving hydraulic cylinder,Sliding sleeve is equipped with traversing slide bar in traversing loop bar,Traversing top end of sliding rod is fixed with pedestal,The lifting body bottom is lifting hydraulic cylinder,It is vertically-mounted on lifting hydraulic cylinder to have one group of raise-lower hydraulic loop bar,Raise-lower hydraulic loop bar inner vertical sliding sleeve is equipped with raise-lower hydraulic slide bar,It states and grips body interior and be provided with a fixed block and grip block,Grip block side is fixedly connected with clamping hydraulic pressure slide bar,Clamping hydraulic pressure sliding bar is sleeved on inside clamping hydraulic pressure loop bar,Automatic parking platform one end is equipped with electric oil pump.The present invention, which can effectively be adjusted work and be suitable for different size automobile, to be lifted.
Description
Technical field
The present invention relates to automatic parking technical field, specially a kind of clamping for parking robot platform lifts dress
It sets.
Background technology
Parking robot is different from traditional robot as the term suggests being the device for carrying out automatic parking, parks
Robot more precisely parking platform generally includes elevating mechanism, vehicle securing mechanism, mobile mechanism's several major group
At.
Existing parking robot while it is working, is substantially carried out the work fixed automobile and jack up lifting again, just specific
During fixed jack-up lifting, the parking robot operation principle of different operating mode would also vary from, in Apparatus for parking vehicles
During the actual division of device people, it is that the width of parking robot is more than vehicle mainly to have two major classes one, and another kind is Apparatus for parking vehicles
Device people's width is less than two kinds of vehicle, and for either specific any parking robot, existing parking robot faces
The problem of being matched with actual vehicle size, and the specification size fixation of existing parking robot is, therefore matched
On there are segmental defects.
Invention content
The purpose of the present invention is to provide a kind of clamping lifting gears for parking robot platform, have hydraulic pressure transverse direction
The advantage that telescopic lifting and hydraulic clamping are fixed, solving existing parking robot, there are specification sizes to fix, and can not carry out
There is the problem of certain defect in the vehicle match of different size specification in adjusting.
To achieve the above object, the present invention provides the following technical solutions：A kind of clamping liter for parking robot platform
Falling unit, including automatic parking platform, lifting body and main body is gripped, the automatic parking mesa base is equipped with movement
It takes turns, transition driving hydraulic cylinder there are four fixations on the automatic parking platform medial surface, is installed on each transition driving hydraulic cylinder
There is one group of traversing loop bar, sliding sleeve is equipped with traversing slide bar in traversing loop bar, and traversing top end of sliding rod is fixed with pedestal, and the lifting is led
Body bottom is lifting hydraulic cylinder, and lifting hydraulic cylinder is fixed on pedestal, vertically-mounted on lifting hydraulic cylinder to have one group of lifting liquid
Pressing sleeve bar, raise-lower hydraulic loop bar inner vertical sliding sleeve are equipped with raise-lower hydraulic slide bar, and raise-lower hydraulic top end of sliding rod is fixed with top plate,
The body interior that grips is provided with a fixed block and grip block, and grip block side is fixedly connected with clamping hydraulic pressure slide bar,
Clamping hydraulic pressure sliding bar is sleeved on inside clamping hydraulic pressure loop bar, and clamping hydraulic pressure loop bar is mounted in clamping driving hydraulic cylinder, institute
It states automatic parking platform one end and electric oil pump is installed.
Preferably, the automatic parking platform is closed tail end in front end and opens wide setting, and automatic parking berm width is default
Value is more than general-utility car width.
Preferably, the movable pulley is located at automatic parking mesa base four corners, and movable pulley is Mecanum wheel.
The transition driving hydraulic cylinder is that one group of opposition is arranged two-by-two.
Preferably, there are four the lifting body is also arranged altogether, and each lifting body corresponds on each pedestal.
Preferably, the fixed block and grip block mating setting one by one, and fixed block and the opposed distribution of grip block.
Preferably, the fixed block is fixed on top plate upper surface.
Preferably, the grip block slides with respect to top plate and is arranged.
Preferably, the clamping driving hydraulic cylinder is fixed on top plate upper surface.
Preferably, the electric oil pump and each transition driving hydraulic cylinder, lifting hydraulic cylinder and clamping driving hydraulic cylinder it
Between pass through the oil line pipe of Electromagnetic Control carry out fluid connection.
Compared with prior art, beneficial effects of the present invention are as follows：
1, the present invention can make mainly by the way that the combination of traversing loop bar, traversing slide bar and transition driving hydraulic cylinder is arranged
After automatic parking platform moves to vehicle bottom, lateral telescopic adjustment can be carried out, the vehicle to adapt to different in width uses,
Requirement of most vehicles for automatic parking berm width on the market can be met so that the subsequent main body that grips can
Normally to carry out gripping work.
2, the present invention constitutes liquid by the combination of setting raise-lower hydraulic slide bar, raise-lower hydraulic loop bar and lifting hydraulic cylinder
Press the mechanism of lifting so that have the function that hydraulic lifting jacks up automobile in the present invention, and compared to pneumatic or electronic
For, hydraulic coupling, which is more stablized to be more suitable for jacking up with the automobile of the larger heavier-weight of volume, to be used.
3, hydraulic pressure slide bar, clamping hydraulic pressure loop bar and the combination that driving hydraulic cylinder is clamped is clamped by setting in the present invention, reaches
The effect of the automobile chassis that is clamped using hydraulic-driven, the automobile chassis chassis that can also adapt to different-thickness are used.
4, the present invention is mounted with movable pulley in the bottom of automatic parking platform, and movable pulley is that Mecanum wheel makes this hair
Bright movement is more flexible especially to turn round in narrow range.
Description of the drawings
Fig. 1 is the vertical view of the present invention；
Fig. 2 is the front view of the present invention；
Fig. 3 is the lifting body structural schematic diagram in the present invention；
Fig. 4 is to grip main body schematic diagram in the present invention.
In figure：1- electric oil pumps；2- automatic parking platforms；The traversing loop bars of 3-；The traversing slide bars of 4-；5- pedestals；The traversing drives of 6-
Hydrodynamic cylinder pressure；7- lifting bodies；8- movable pulleys；9- grips main body；10- top plates；11- raise-lower hydraulic slide bars；12- lifts liquid
Pressing sleeve bar；13- lifting hydraulic cylinders；14- fixed blocks；15- grip blocks；Hydraulic pressure slide bar is clamped in 16-；Hydraulic pressure loop bar is clamped in 17-；18-
Driving hydraulic cylinder is clamped.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It please refers to Fig.1 to 4, a kind of embodiment provided by the invention：A kind of clamping for parking robot platform lifts
Device, including automatic parking platform 2, lifting body 7 and grip main body 9, it is spacious that automatic parking platform 2 in front end is closed tail end
It opens up and sets, and 2 width preset value of automatic parking platform is more than general-utility car width, 2 bottom of automatic parking platform is equipped with movement
Wheel 8, movable pulley 8 is located at 2 bottom four corners of automatic parking platform, and movable pulley 8 is Mecanum wheel, and movable pulley 8 is wheat
Ke Namu wheels can make present invention movement more flexible, and fixed on 2 medial surface of automatic parking platform there are four traversing driving liquid
Cylinder pressure 6, transition driving hydraulic cylinder 6 are that one group of opposition is arranged two-by-two, and one group of traversing set is equipped on each transition driving hydraulic cylinder 6
Bar 3, sliding sleeve is equipped with traversing slide bar 4 in traversing loop bar 3, and 4 top of traversing slide bar is fixed with pedestal 5, and transition driving hydraulic cylinder 6 is used
In driving traversing slide bar 4 to eject pedestal 5 outward, lifting body 7 is also altogether there are four settings, and each lifting body 7 corresponds to
On each pedestal 5,7 bottom of lifting body is lifting hydraulic cylinder 13, and lifting hydraulic cylinder 13 is fixed on pedestal 5, raise-lower hydraulic
It is vertically-mounted on cylinder 13 to there is one group of raise-lower hydraulic loop bar 12,12 inner vertical sliding sleeve of raise-lower hydraulic loop bar to be slided equipped with raise-lower hydraulic
Bar 11,11 top of raise-lower hydraulic slide bar are fixed with top plate 10, lifting hydraulic cylinder 13 for driving raise-lower hydraulic slide bar 11 upwards or
Person stretches downwards, grips main body 9 and is internally provided with a fixed block 14 and grip block 15, fixed block 14 and grip block 15
Mating setting one by one, and the 15 opposed distribution of fixed block 14 and grip block, fixed block 14 are fixed on 10 upper surface of top plate, grip block
The 15 opposite sliding of top plate 10 settings, 15 side of grip block are fixedly connected with clamping hydraulic pressure slide bar 16, and clamping hydraulic pressure slide bar 16 slides
It is sleeved on inside clamping hydraulic pressure loop bar 17, clamping hydraulic pressure loop bar is mounted in clamping driving hydraulic cylinder 18, and driving hydraulic cylinder is clamped
18 are fixed on 10 upper surface of top plate, and clamping driving hydraulic cylinder 18 is utilized for driving clamping hydraulic pressure slide bar 16 to push grip block 15
Effect between grip block 15 and fixed block 14 carries out hydraulic pressure fixed clamp work, automatic parking platform 2 to automobile chassis chassis
One end is equipped with electric oil pump 1, electric oil pump 1 and each transition driving hydraulic cylinder 6, lifting hydraulic cylinder 13 and clamping driving hydraulic pressure
Fluid connection is carried out by the oil line pipe of Electromagnetic Control between cylinder 18.
According to embodiments of the present invention, bottom of car to be parked is moved to by 8 present invention of movable pulley, passes through electric oil pump
1 generates the variation of fluid, and fluid can be transformed into mechanical energy by transition driving hydraulic cylinder 6 and then drive traversing slide bar 4 by base
The ejection outward of seat 5, drives raise-lower hydraulic slide bar 11 by gripping on top plate 10 and top plate 10 by lifting hydraulic cylinder 13
Main body 9 pushes the effect that lifting can be realized upwards, by be clamped the driving clamping of driving hydraulic cylinder 18 hydraulic pressure slide bar 16 move after
And grip block 15 is driven to be moved automobile chassis chassis therewith through the opposite fixed clamp effect of grip block 15 and fixed block 14
Place is fixed.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of clamping lifting gear for parking robot platform, including automatic parking platform (2), lifting body (7) and
Grip main body (9), it is characterised in that：Automatic parking platform (2) bottom is equipped with movable pulley (8), the automatic pool
It is fixed there are four transition driving hydraulic cylinder (6) on vehicle platform (2) medial surface, it is equipped with one on each transition driving hydraulic cylinder (6)
The traversing loop bar (3) of group, the interior sliding sleeve of traversing loop bar (3) are equipped with traversing slide bar (4), and traversing slide bar (4) top is fixed with pedestal
(5), lifting body (7) bottom is lifting hydraulic cylinder (13), and lifting hydraulic cylinder (13) is fixed on pedestal (5), lifting
It is vertically-mounted on hydraulic cylinder (13) to there is one group of raise-lower hydraulic loop bar (12), raise-lower hydraulic loop bar (12) inner vertical sliding sleeve to be equipped with
Raise-lower hydraulic slide bar (11), raise-lower hydraulic slide bar (11) top are fixed with top plate (10), and described grip sets inside main body (9)
It is equipped with a fixed block (14) and grip block (15), grip block (15) side is fixedly connected with clamping hydraulic pressure slide bar (16), and liquid is clamped
Press slide bar (16) sliding sleeve internal mounted in clamping hydraulic pressure loop bar (17), clamping hydraulic pressure loop bar is mounted on clamping driving hydraulic cylinder (18)
Interior, described automatic parking platform (2) one end is equipped with electric oil pump (1).
2. a kind of clamping lifting gear for parking robot platform according to claim 1, it is characterised in that：It is described
Automatic parking platform (2) is closed tail end in front end and opens wide setting, and automatic parking platform (2) width preset value is more than general-utility car
Width.
3. a kind of clamping lifting gear for parking robot platform according to claim 1, it is characterised in that：It is described
Movable pulley (8) is located at automatic parking platform (2) bottom four corners, and movable pulley (8) is Mecanum wheel.
4. a kind of clamping lifting gear for parking robot platform according to claim 1, it is characterised in that：It is described
Transition driving hydraulic cylinder (6) is that one group of opposition is arranged two-by-two.
5. a kind of clamping lifting gear for parking robot platform according to claim 1, it is characterised in that：It is described
There are four lifting body (7) is also arranged altogether, and on the corresponding each pedestal (5) of each lifting body (7).
6. a kind of clamping lifting gear for parking robot platform according to claim 1, it is characterised in that：It is described
Fixed block (14) and grip block (15) mating setting one by one, and fixed block (14) and grip block (15) opposed distribution.
7. a kind of clamping lifting gear for parking robot platform according to claim 1, it is characterised in that：It is described
Fixed block (14) is fixed on top plate (10) upper surface.
8. a kind of clamping lifting gear for parking robot platform according to claim 1, it is characterised in that：It is described
Grip block (15) is with respect to top plate (10) sliding setting.
9. a kind of clamping lifting gear for parking robot platform according to claim 1, it is characterised in that：It is described
Clamping driving hydraulic cylinder (18) is fixed on top plate (10) upper surface.
10. a kind of clamping lifting gear for parking robot platform according to claim 1, it is characterised in that：Institute
It states between electric oil pump (1) and each transition driving hydraulic cylinder (6), lifting hydraulic cylinder (13) and clamping driving hydraulic cylinder (18)
Fluid connection is carried out by the oil line pipe of Electromagnetic Control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810397501.6A CN108640014A (en) | 2018-04-28 | 2018-04-28 | A kind of clamping lifting gear for parking robot platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810397501.6A CN108640014A (en) | 2018-04-28 | 2018-04-28 | A kind of clamping lifting gear for parking robot platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108640014A true CN108640014A (en) | 2018-10-12 |
Family
ID=63748473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810397501.6A Pending CN108640014A (en) | 2018-04-28 | 2018-04-28 | A kind of clamping lifting gear for parking robot platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108640014A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111196579A (en) * | 2020-03-03 | 2020-05-26 | 徐宜灯 | Adjustable fixing device for motor vehicle maintenance lifting table |
| CN111910977A (en) * | 2020-08-17 | 2020-11-10 | 重庆工商大学 | Parking robot |
| CN112194047A (en) * | 2020-09-24 | 2021-01-08 | 浙江硕维轨道交通装备有限公司 | Lifting device for subway monitoring and maintenance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204728778U (en) * | 2015-02-10 | 2015-10-28 | 广州信邦汽车装备制造有限公司 | A kind of liftable parking robot |
| CN204782157U (en) * | 2015-02-10 | 2015-11-18 | 广州信邦汽车装备制造有限公司 | Multi -functional robot that parks |
| CN204804421U (en) * | 2015-02-10 | 2015-11-25 | 广州信邦汽车装备制造有限公司 | Robot vertically parks |
| CN205835327U (en) * | 2016-06-30 | 2016-12-28 | 安徽省科昌机械制造股份有限公司 | A kind of transition mechanical hand |
| CN206530117U (en) * | 2017-03-01 | 2017-09-29 | 上海汇聚自动化科技有限公司 | Intelligent omnidirectional's shifting carrying platform parking robot |
| CN206705239U (en) * | 2017-05-13 | 2017-12-05 | 浙江博众汽车科技有限公司 | A kind of handling device |
| CN107826087A (en) * | 2017-12-11 | 2018-03-23 | 山西东杰智能物流装备股份有限公司 | A kind of intelligent parking ferry-boat robot |
-
2018
- 2018-04-28 CN CN201810397501.6A patent/CN108640014A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204728778U (en) * | 2015-02-10 | 2015-10-28 | 广州信邦汽车装备制造有限公司 | A kind of liftable parking robot |
| CN204782157U (en) * | 2015-02-10 | 2015-11-18 | 广州信邦汽车装备制造有限公司 | Multi -functional robot that parks |
| CN204804421U (en) * | 2015-02-10 | 2015-11-25 | 广州信邦汽车装备制造有限公司 | Robot vertically parks |
| CN205835327U (en) * | 2016-06-30 | 2016-12-28 | 安徽省科昌机械制造股份有限公司 | A kind of transition mechanical hand |
| CN206530117U (en) * | 2017-03-01 | 2017-09-29 | 上海汇聚自动化科技有限公司 | Intelligent omnidirectional's shifting carrying platform parking robot |
| CN206705239U (en) * | 2017-05-13 | 2017-12-05 | 浙江博众汽车科技有限公司 | A kind of handling device |
| CN107826087A (en) * | 2017-12-11 | 2018-03-23 | 山西东杰智能物流装备股份有限公司 | A kind of intelligent parking ferry-boat robot |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111196579A (en) * | 2020-03-03 | 2020-05-26 | 徐宜灯 | Adjustable fixing device for motor vehicle maintenance lifting table |
| CN111196579B (en) * | 2020-03-03 | 2021-06-15 | 绍兴市高砚智生物科技有限公司 | Adjustable fixing device for motor vehicle maintenance lifting table |
| CN111910977A (en) * | 2020-08-17 | 2020-11-10 | 重庆工商大学 | Parking robot |
| CN112194047A (en) * | 2020-09-24 | 2021-01-08 | 浙江硕维轨道交通装备有限公司 | Lifting device for subway monitoring and maintenance |
| CN112194047B (en) * | 2020-09-24 | 2022-03-11 | 浙江硕维轨道股份有限公司 | Lifting device for subway monitoring and maintenance |
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Application publication date: 20181012 |
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