CN208314009U - The non-contact vehicle speed sensor of Hall-type and its control system of tangential direction installation - Google Patents
The non-contact vehicle speed sensor of Hall-type and its control system of tangential direction installation Download PDFInfo
- Publication number
- CN208314009U CN208314009U CN201820866388.7U CN201820866388U CN208314009U CN 208314009 U CN208314009 U CN 208314009U CN 201820866388 U CN201820866388 U CN 201820866388U CN 208314009 U CN208314009 U CN 208314009U
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- Prior art keywords
- hall
- tangential direction
- vehicle speed
- speed sensor
- type
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2637—Vehicle, car, auto, wheelchair
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The non-contact vehicle speed sensor of Hall-type and its control system of a kind of tangential direction installation of the utility model, are related to automobile sensor field.It include: installation shell, its axial direction of a lateral edge of the installation housing tip is provided with induction zone, and the induction zone is located at the installation enclosure interior；The installation shell tail end is provided with connector, and the connector is for connecting external control unit outside；The installation shell with gear box casing for being fixedly connected；Gap is equipped between the induction zone and induction wheel on output shaft of gear-box, the top plan of the induction zone is parallel with the tangential direction of the induction wheel；Electronic circuit is set to the installation enclosure interior, connect respectively with the induction zone, the connector.Mounting means is more flexible；The voltage signal that induction zone generates is transmitted to full-vehicle control unit after filtering, shaping, amplification reach requirement, through the electronic circuit, connector output, accurately quickly reflects car speed.
Description
Technical field
The utility model relates to automotive sensor technology fields, and in particular to a kind of Hall-type of tangential direction installation is non-to be connect
Touch vehicle speed sensor and its control system.
Background technique
As universal and commercialization, demand of the market to vehicle sensors of automobile are more, it is desirable that also stringenter.Wherein,
Vehicle speed sensor and its indicator (speedometer) are to provide the important tool of Vehicle Speed information.
Vehicle speed sensor main function is detection output shaft of gear-box revolving speed, feeds back carload instrument through its signal and control is single
Member calculates the travel speed of vehicle.The device of measurement automobile speed mileage signal is usually touch sensor at present, is passed through
Mechanical screw rod output shaft rotation magnetic pole generates pulse signal, so that the speed of running car is detected, due to mechanical wear
And the reasons such as cooperation of metalwork, so that general common vehicle speed mileage sensor service life is all very short.Additionally, due to speed
The position of odometer sensor installation is more complicated, so that replacement of products maintenance is more troublesome, it is short, maintenance inconvenience there are the service life
Technical problem.
Noncontacting proximity sensor can effectively solve the problem that above-mentioned technical problem.The existing non-contact vehicle speed sensor of Hall-type, though
It so can smoothly realize the detection of speed, but the non-contact vehicle speed sensor mounting means of existing Hall-type is fixed, sensor is necessary
It is installed with target wheel central axis.Current existing automobile variable speed box structure has been fixed, and most of vehicle is caused not to be available non-connect
Touch sensor, and continue to continue to use contact type structure.Existing automobile gearbox is switched to original contact vehicle speed sensor
Noncontacting proximity sensor, existing main problem is: installing to meet sensor and target wheel central axis, needs more to change
Fast case rear cover, but existing gearbox is Al-alloy casing mostly, and casting expense is excessively high, causes switching surfaces excessively high.
In view of this, proposing the application.
Summary of the invention
For the defects in the prior art, the purpose of the utility model is to provide a kind of mounting means flexibly, does not need to change
Become the non-contact vehicle speed sensor of Hall-type of the tangential direction installation of gearbox rear cover.
In a first aspect, the utility model provides a kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation, packet
Include: installation shell, its axial direction of a lateral edge of the installation housing tip are provided with induction zone, and the induction zone is located at the installation
Enclosure interior；The installation shell tail end is provided with connector, and the connector is for connecting external control unit outside；The installation
Shell with gear box casing for being fixedly connected；
Gap, the top flat of the induction zone are equipped between the induction zone and induction wheel on output shaft of gear-box
Face is parallel with the tangential direction of the induction wheel；
Electronic circuit is set to the installation enclosure interior, connect respectively with the induction zone, the connector.
Further, the induction zone includes: Hall element and permanent magnetic steel,
The top plan of the Hall element is parallel with the tangential direction of the induction wheel, the top of the Hall element with
The induction wheel is contactless to be oppositely arranged；
The Hall element is fixed on the permanent magnetic steel, and the electronic circuit is fixedly connected with the Hall element,
The induced voltage that the Hall element generates is transmitted to the connector by the electronic circuit, and the connector is used for institute
The induced voltage for stating Hall element generation is exported to external control unit outside.
Further, further includes: sensor installs snap-gauge, after the installation shell is fixed on the gearbox
End cap.
Further, further includes: sealing ring is set between installation shell and the gear box casing.
Further, further includes: bracket, the corner of the bracket are provided with a card slot, and the card slot is for described in fixation
Permanent magnetic steel；The side of the bracket is provided with a bulge-structure, and the bulge-structure is for fixing the electronic circuit.
Further, fender bracket is additionally provided on the outside of the bulge-structure, the electronic circuit passes through the fender bracket
One end is fixed with the bulge-structure, and the other end of the fender bracket is for fixing the Hall element；
The connecting path of the Hall element and the electronic circuit is located in the fender bracket.
Further, the induction wheel is soft magnetic material.
Further, the gap of the Hall element and the induction wheel is 0.8mm-2.0mm.
Second aspect, the utility model provide the non-contact vehicle speed sensor control system of Hall-type, including control unit
With the non-contact vehicle speed sensor of Hall-type of tangential direction described in any of the above embodiments installation, described control unit is for receiving institute
The voltage signal of vehicle speed sensor is stated, and the voltage signal is converted into velocity information.
The non-contact vehicle speed sensor of Hall-type and its control system of a kind of tangential direction installation provided by the utility model,
During installation, so that induction zone installation parallel with the tangential direction of the induction wheel, is not required to have to make sensor
Top and the induction wheel face, therefore on mounting means relatively flexibly, it is non-contact replacing with touch sensor
When formula sensor, gearbox rear cover is had no need to change, carries out mounting and adjusting direction, installation along former touch sensor position
Mode is more flexible.When induction wheel rotation, the static magnetic field strength that the permanent magnetic steel near the induction zone provides generates the period
The variation of property；So that the magnetic flux for passing through sensor generates periodically variation, the induction zone is generated by change magnetic flux
Periodically variable voltage signal, the signal is after filtering, shaping, amplification reach requirement, through the electronic circuit, the connection
Device output is transmitted to full-vehicle control unit, accurately quickly reflects car speed.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar
Element or part are generally identified by similar appended drawing reference.In attached drawing, each element or part might not be according to actual ratios
It draws.
The non-contact vehicle speed sensor structure of Hall-type for the tangential direction installation that Fig. 1 an embodiment of the present invention provides
Figure；
Fig. 2 is the non-contact vehicle speed sensor signal of Hall-type for the tangential direction installation that an embodiment of the present invention provides
Acquire schematic diagram；
Fig. 3 is the non-contact vehicle speed sensor letter of Hall-type for the tangential direction installation that another embodiment of the utility model provides
Number acquisition schematic diagram；
Appended drawing reference:
1- Hall element
2- permanent magnetic steel
3- bracket
31- card slot
32- bulge-structure
33- fender bracket
4- electronic circuit
5- installs shell
6- sealing ring
7- connector
8- sensor installs snap-gauge
9 gear box casings
10- induction wheel
Specific embodiment
The technical solution of the utility model is described in detail below in conjunction with specific embodiment.Following embodiment is only
For clearly illustrating the technical solution of the utility model, therefore it is intended only as example, and cannot be used as a limitation and limit this reality
With novel protection scope.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this reality
The ordinary meaning understood with novel one of ordinary skill in the art.
As shown in Figure 1, a kind of non-contact vehicle of Hall-type of tangential direction installation provided in an embodiment of the present invention
Fast sensor, comprising: installation shell 5, its axial direction of a lateral edge on installation 5 top of shell are provided with induction zone, the induction
Area is located inside the installation shell 5；5 tail end of installation shell is provided with connector 7, and the connector 7 is outer for connecting
Portion's control unit；The installation shell 5 with gear box casing 9 for being fixedly connected；The induction zone is exported with gearbox is located at
Gap is equipped between induction wheel 10 on axis, the top plan of the induction zone is parallel with the tangential direction of the induction wheel 10；
Electronic circuit 4 is set to the installation enclosure interior, connect respectively with the induction zone, the connector 7.The utility model
The non-contact vehicle speed sensor of Hall-type and its control system of a kind of tangential direction installation provided, during installation, so that described
Induction zone installation parallel with the tangential direction of the induction wheel 10, is not required to have to make the top of sensor and the induction
10 faces are taken turns, therefore on mounting means relatively flexibly, when touch sensor is replaced with noncontacting proximity sensor, no
It needs to change gearbox rear cover, carries out mounting and adjusting direction along former touch sensor position, mounting means is more flexible.When
When induction wheel 10 rotates, the static magnetic field strength that the permanent magnetic steel near the induction zone provides generates periodically variation；Make
The magnetic flux obtained across sensor generates periodically variation, and the induction zone is generated periodically variable by change magnetic flux
Voltage signal, the signal is after filtering, shaping, amplification reach requirement, through the electronic circuit 4, the output transmitting of the connector 7
To full-vehicle control unit, accurately quickly reflect car speed.
A kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation provided in an embodiment of the present invention, institute
Stating induction zone includes: Hall element 1 and permanent magnetic steel 2, the tangent line of the top plan of the Hall element 1 and the induction wheel 10
Direction is parallel, the top of the Hall element 1 with the induction wheel 10 is contactless is oppositely arranged；The Hall element 1 is fixed
In on the permanent magnetic steel 2, the electronic circuit 4 is fixedly connected with the Hall element 1, the sense that the Hall element 1 generates
Voltage is answered to be transmitted to the connector 7 by the electronic circuit 4, what the connector 7 was used to generate the Hall element 1
Induced voltage is exported to external control unit outside.The Hall element 1, the permanent magnetic steel 2, the electronic circuit 4 are all set in
In the installation shell 5.The induced voltage that the Hall element 1 generates is transmitted to the connector by the electronic circuit 4
7, the connector 7 is for exporting the induced voltage that the Hall element 1 generates to external control unit outside.The permanent magnetic steel
2 be to provide the permanent magnetic steel 2 in constant quiescent magnetic field.Permanent magnetic steel 2 when induction wheel 10 rotates, near the Hall element 1
The static magnetic field strength of offer generates periodically variation；So that the magnetic flux for passing through sensor generates periodically variation, institute
It states Hall element 1 and periodically variable voltage signal is generated by change magnetic flux, which reaches through filtering, shaping, amplification
After it is required that, it is transmitted to full-vehicle control unit through the electronic circuit 4, the output of the connector 7, accurately quickly reflects vehicle
Speed.
A kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation provided in an embodiment of the present invention, also
It include: sensor installation snap-gauge 8, for the installation shell 5 to be fixed on to the rear end cap of the gearbox, so that speed
Sensor is installed snap-gauge 8 by sensor and is mounted on speed changer rear end cap (with former mechanical sensor mounting-positioning holes one
It causes).In order to guarantee the leakproofness of gearbox, a kind of Hall-type of tangential direction installation provided in an embodiment of the present invention
Non-contact vehicle speed sensor, further includes: sealing ring 6 is set between the installation shell 5 and gear box casing 9.The product pass through
Installation snap-gauge is fixed on gearbox in speed sensor mounting hole, passes through the sealing in the pinch sensors of shell and mounting hole
Circle 6 guarantees the sealing to gearbox.
A kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation provided in an embodiment of the present invention, also
It include: bracket 3, the corner of the bracket 3 is provided with a card slot 31, and the card slot 31 is for fixing the permanent magnetic steel 2；It is described
The side of bracket 3 is provided with a bulge-structure 32, and the bulge-structure 32 is for fixing the electronic circuit 4.
A kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation provided in an embodiment of the present invention, institute
State and be additionally provided with fender bracket 33 on the outside of bulge-structure 32, the electronic circuit 4 pass through the fender bracket 33 one end with it is described convex
It plays structure 32 to fix, the other end of the fender bracket 33 is for fixing the Hall element 1；The Hall element 1 and the electricity
The connecting path of sub-circuit 4 is located in the fender bracket 33.
In the case where not changing gearbox overall structure, because the application with the driving tooth on output shaft in cabinet in the prior art not
Together, it uses induction wheel 10 (common 8 teeth, 16 teeth), a kind of tangential direction installation provided in an embodiment of the present invention
The non-contact vehicle speed sensor of Hall-type, 10 material of induction wheel is mainly soft magnetic material, when induction wheel 10 rotates, is caused
The static magnetic field strength that the permanent magnetic steel 2 of 1 attachment of Hall element provides generates periodically variation, and Hall element 1 is according to Hall
Effect principle generates induced voltage, by electronic circuit 4 and the output of connector 7 to external control unit outside.The utility model one is real
A kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation provided in example, the Hall element 1 and the induction are provided
The gap of wheel 10 is 0.8mm-2.0mm.
As shown in Fig. 2, the position shown in Fig. 2 at induction wheel 10, the magnetic line of force across Hall element 1 disperses, and magnetic field is strong
It spends relatively weak；As shown in figure 3, the position shown in Fig. 3 at the induction wheel 10, across the magnetic line of force Relatively centralized of Hall element 1,
Magnetic field strength is stronger.When induction wheel 10 rotates, the magnetic line of force intensity across Hall element 1 changes, to generate pulse friendship
Become induced voltage signal to amplify by electronic circuit 4, be shaped to standard block signal, be exported by connector 7 to instrument, control
Unit etc..Hall part and 10 spacing of induction wheel are 0.8mm-2.0mm, can guarantee its reliable output.
The non-contact vehicle speed sensor control system of Hall-type, including control are additionally provided in the utility model other embodiments
The non-contact vehicle speed sensor of Hall-type of unit and tangential direction described in any of the above embodiments installation, described control unit is for connecing
The voltage signal of the vehicle speed sensor is received, and the voltage signal is converted into velocity information.Described control unit can be single
The controllers such as piece machine processor, CPU.
The utility model has several advantages that
Under the premise of not changing gear box, instead of the used touch sensor of gearbox, use is contactless
Sensor reduces gearbox cost, reduces components type, unified speed ratio relationship, gearbox model is reduced, convenient for management and group
Knit production；
High sensitivity, consistency are good, and freedom from vibration is high；
Technology maturation, advanced, frequency response is up to 10KHz；
Part is few, fault point is few, and without transmission parts, electronic product long service life, reliability is increased substantially.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this reality
The ordinary meaning understood with novel one of ordinary skill in the art.
In the description of the present application, 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 the figure or
Positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the device or member of indication or suggestion meaning
Part must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relatively important
Property or implicitly indicate the quantity of indicated technical characteristic.The meaning of " plurality " is two in the description of the present invention,
More than, unless otherwise specifically defined.
In this application 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；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
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 this application unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly 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
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the specification of the utility model, numerous specific details are set forth.It is to be appreciated, however, that the reality of the utility model
Applying example can practice without these specific details.In some embodiments, be not been shown in detail well known method,
Structure and technology, so as not to obscure the understanding of this specification.
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 contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and is necessarily directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be with
It can be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this field
Technical staff can by the feature of different embodiments or examples described in this specification and different embodiments or examples into
Row combination and combination.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type, should all cover in the claim of the utility model and the range of specification.
Claims (9)
1. a kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation characterized by comprising
Shell is installed, its axial direction of a lateral edge of the installation housing tip is provided with induction zone, and the induction zone is located at the peace
Fill enclosure interior；The installation shell tail end is provided with connector, and the connector is for connecting external control unit outside；The peace
Dress shell with gear box casing for being fixedly connected；
Be equipped with gap between the induction zone and induction wheel on output shaft of gear-box, the top plan of the induction zone with
The tangential direction of the induction wheel is parallel；
Electronic circuit is set to the installation enclosure interior, connect respectively with the induction zone, the connector.
2. a kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation according to claim 1, which is characterized in that
The induction zone includes: Hall element and permanent magnetic steel,
The top plan of the Hall element is parallel with the tangential direction of the induction wheel, the top of the Hall element with it is described
Induction wheel is contactless to be oppositely arranged；
The Hall element is fixed on the permanent magnetic steel, and the electronic circuit is fixedly connected with the Hall element, described
The induced voltage that Hall element generates is transmitted to the connector by the electronic circuit, and the connector is used for by described in suddenly
The induced voltage that your element generates is exported to external control unit outside.
3. a kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation according to claim 1, which is characterized in that
Further include: sensor installs snap-gauge, for the installation shell to be fixed on to the rear end cap of the gearbox.
4. a kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation according to claim 1, which is characterized in that
Further include: sealing ring is set between installation shell and the gear box casing.
5. a kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation according to claim 2, which is characterized in that
Further include: bracket, the corner of the bracket are provided with a card slot, and the card slot is for fixing the permanent magnetic steel；The bracket
Side be provided with a bulge-structure, the bulge-structure is for fixing the electronic circuit.
6. a kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation according to claim 5, which is characterized in that
Fender bracket, the one end and the bulge-structure of the electronic circuit across the fender bracket are additionally provided on the outside of the bulge-structure
Fixed, the other end of the fender bracket is for fixing the Hall element；
The connecting path of the Hall element and the electronic circuit is located in the fender bracket.
7. a kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation according to claim 1, which is characterized in that
The induction wheel is soft magnetic material.
8. a kind of non-contact vehicle speed sensor of Hall-type of tangential direction installation according to claim 1, which is characterized in that
The gap of the induction zone and the induction wheel is 0.8mm-2.0mm.
9. the non-contact vehicle speed sensor control system of Hall-type, which is characterized in that any including control unit and claim 1-8
The non-contact vehicle speed sensor of Hall-type of tangential direction installation described in, described control unit is for receiving the speed sensing
The voltage signal of device, and the voltage signal is converted into velocity information.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018103326491 | 2018-04-13 | ||
| CN201810332649 | 2018-04-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208314009U true CN208314009U (en) | 2019-01-01 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810568585.5A Withdrawn CN108445251A (en) | 2018-04-13 | 2018-06-05 | The non-contact vehicle speed sensor of Hall-type and its control system of tangential direction installation |
| CN201820866388.7U Active CN208314009U (en) | 2018-04-13 | 2018-06-05 | The non-contact vehicle speed sensor of Hall-type and its control system of tangential direction installation |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810568585.5A Withdrawn CN108445251A (en) | 2018-04-13 | 2018-06-05 | The non-contact vehicle speed sensor of Hall-type and its control system of tangential direction installation |
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| CN (2) | CN108445251A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816730B (en) * | 2021-01-04 | 2022-11-08 | 东风柳州汽车有限公司 | Hall type rotating speed sensor, rotating speed measuring device and measuring method |
-
2018
- 2018-06-05 CN CN201810568585.5A patent/CN108445251A/en not_active Withdrawn
- 2018-06-05 CN CN201820866388.7U patent/CN208314009U/en active Active
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|---|---|
| CN108445251A (en) | 2018-08-24 |
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