CN105469607A - Geomagnetic vehicle detector and installation method for same - Google Patents
Geomagnetic vehicle detector and installation method for same Download PDFInfo
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- CN105469607A CN105469607A CN201510994498.2A CN201510994498A CN105469607A CN 105469607 A CN105469607 A CN 105469607A CN 201510994498 A CN201510994498 A CN 201510994498A CN 105469607 A CN105469607 A CN 105469607A
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- support
- pcba
- earth magnetism
- wagon detector
- battery
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
Abstract
The invention relates to a geomagnetic vehicle detector which specifically comprises a PCBA, a battery, a support and a shell, wherein one end of the support is a PCBA clamping part, the other end of the support is a battery support, the PCBA is fixed on the PCBA clamping part, and the battery is fixed on the battery support; the shell comprises a shell body and a shell cover, and the shell cover and the shell body are welded to form a sealing chamber; and the support firmly equipped with the PCBA and the battery is assembled on the shell body and sealed inside the sealing chamber through arrangement of the PCBA clamping part towards the bottom part of the shell body. The invention also relates to an installation method of the geomagnetic vehicle detector, and the method comprises inverted installation of the geomagnetic vehicle detector. The geomagnetic vehicle detector and the installation method for the same provided by the invention can basically avoid PCBA water soaking and can increase waterproof performance of the geomagnetic vehicle detector.
Description
Technical field
The present invention relates to intelligent transportation field, especially a kind of earth magnetism wagon detector and installation method thereof.
Background technology
Intelligent transportation system (ITS, IntelligentTransportationSystem), by the integrated whole ground traffic control system that applies to effectively such as the infotech of advanced person, data communication transmission technology, Electronic transducer technology, control technology and computer technology, can on a large scale, comprehensive performance in real time, composite communications transport management role accurately and efficiently.Composite communications transport management specifically comprises public transport management, commercial car operation management, trip requirements management, emergency traffic management, wagon control and safety management etc., and vehicle detecting system is then the data basis that ITS realizes composite communications transport management.
Vehicle detecting system is divided into two classes according to the type of wagon detector: based on the vehicle detecting system of fixed vehicle detecting device, and based on the vehicle detecting system of moving vehicle detecting device.For the vehicle detecting system based on fixed vehicle detecting device, each track of road network is distributed under some class wagon detector needs to be fixedly installed on road surface, such as, earth magnetism wagon detector, such laying feature makes vehicle equipment incessantly need to solve and install checkout equipment and can damage the problems such as road surface, difficulty of construction are large, working environment severe under also needing to consider road surface is for the impact of wagon detector, and especially humidity is for the impact of wagon detector.
Concrete, earth magnetism wagon detector is generally embedded in urban road upper strata, urban road upper strata mostly is pitch cement gravel or concrete material is laid, these properties of materials not easily seep water after solidifying, but the water infiltered not easily evaporates discharge, cause the working environment of earth magnetism wagon detector moist for a long time, at the time earth magnetism wagon detector of rainy, many snow or even under water, thus waterproof is one of necessary performance of earth magnetism wagon detector.
At present, usually water-tight is realized by arranging O-ring seal between the housing and cap of earth magnetism wagon detector shell.But when vehicle crosses above earth magnetism wagon detector, magnetic vehicle detecting device produces horizontal forward impulsive force and downward pressure over the ground, the seam crossing of housing and enclosing cover is out of shape, and then cause seal failure to seep water, the earth magnetism wagon detector that takes place frequently in practice leaks and causes the assembling printed circuit board (PCB) (PCBA of detecting device, printedcircuitboardassembly) damage event also demonstrates this point, visible, and aforementioned seal structure can not the waterproof demand of magnetic vehicle detecting device contentedly.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of earth magnetism wagon detector and installation method thereof, substantially can stop the possibility of PCBA immersion, improves the water resistance of earth magnetism wagon detector.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of earth magnetism wagon detector, comprising: PCBA, battery, support and shell; Described shell comprises housing and cap, and cap forms seal chamber together with case weld; Described PCBA and battery are fixed on the bracket, are sealed in described seal chamber together with support; Described cap bottom surface is provided with pillar, and this pillar contacts with described support but do not extrude, and be inverted described seal chamber time this shore supports described in support.
Further, support is located in addition in described support both sides; The side wall inner surfaces corresponding positions of described housing is equipped with location supporting piece; Accordingly,
Described support is sealed in described seal chamber and comprises: described location support embeds described location supporting piece, and support does not contact with housing bottom.
Further, described support one end is PCBA fastener, and the other end is battery tray; Accordingly,
Described PCBA and battery are fixed and are specially on the bracket,
Described PCBA is fixed on PCBA fastener, and described battery is fixed in battery tray.
Further, described PCBA fastener comprises at least four symmetrical between two sub-fasteners; Accordingly,
Described PCBA is fixed on PCBA fastener: each subcard part fixes an angle or a limit of PCBA; Wherein,
Described subcard part comprises dop and shell fragment, and dop upwards supports an angle or a limit of PCBA, and shell fragment then extruding downwards fixes this angle or limit.
Further, described battery tray comprises base, and the arc flap that the relative both sides of base extend upward; Accordingly,
Described battery is fixed in battery tray and comprises: base supports described battery, and two arc flaps then hug this battery and the common self-contained battery of base; Accordingly,
Described pillar contacts with described support but does not extrude and is specially,
The arc flap extrados that described pillar is corresponding with self contacts but does not extrude;
Described in described shore supports, support is specially,
Described shore supports is under the arc flap extrados of self correspondence.
Further, the height of described seal chamber and the ponding situation of environment for use, the upper surface of battery meet following formula to the distance of housing bottom surface inside surface:
Wherein, P is atmospheric pressure, and ρ is the density of water, and g is acceleration of gravity, h
sfor the height of seal chamber, h
xfor the upper surface of battery is to the distance of housing bottom surface inside surface, h
jfor the height of the ponding water surface to described housing inner bottom surface on rear road surface installed by earth magnetism wagon detector.
Further, described PCBA mono-jiao is provided with the first positioning port/the first positioning table, and one jiao, described support is provided with the first positioning table/the first positioning port, and this first positioning table embeds the first positioning port; Described location support comprises the first location support and the second location support, be divided into support both sides, described location supporting piece comprises the first location supporting piece and the second location supporting piece, and this first location support embeds the first location supporting piece, and the second location support embeds the second location supporting piece;
Accordingly,
There is arrow described outside bottom surface, and when described bracket assembled is on housing, this arrow points is fixed on the x-axis positive dirction of geomagnetic sensor on the PCBA in this housing.
Further, described PCBA mono-jiao is provided with the first positioning port/the first positioning table, and one jiao, described support is provided with the first positioning table/the first positioning port, and this first positioning table embeds the first positioning port; Described location support comprises the first location support and the second location support, be divided into support both sides, described location supporting piece comprises the first location supporting piece and the second location supporting piece, and this first location support embeds the first location supporting piece, and the second location support embeds the second location supporting piece; Accordingly,
There is arrow described outside bottom surface, and when described bracket assembled is on housing, this arrow points is fixed on the y-axis positive dirction of the geomagnetic sensor on the PCBA of this housing.
The installation method of described earth magnetism wagon detector, comprising:
Hole on road upper strata;
Described earth magnetism wagon detector end face is downward, bottom surface is upwards inverted in the hole;
Fixed sealing material magnetic vehicle detecting device is regularly filled in the gap in earth magnetism wagon detector and described hole.
Further, the described detecting device of magnetic vehicle regularly comprises: in the gap in earth magnetism wagon detector and described hole, pour into casting glue; Or,
At bottom place mat dry cement or the fine sand soil in described hole, pour into casting glue in the gap of earth magnetism wagon detector and described hole sidewall; Or,
At bottom place mat dry cement or the fine sand soil in described hole, and at the gap-fill dry cement of earth magnetism wagon detector and described hole lower sidewall or fine sand soil, pour into casting glue in the gap of earth magnetism wagon detector and described hole side wall upper part.
Based on above-mentioned, earth magnetism wagon detector provided by the invention and installation method thereof, have the following advantages and feature:
1, earth magnetism wagon detector of the present invention, when being inverted installation earth magnetism wagon detector, shore supports plays described support, like this, earth magnetism wagon detector seepage is not serious, pour in water level when not reaching PCBA and the residing height of battery, PCBA and battery can not be dipped into, improve the water resistance of earth magnetism wagon detector;
2, during earth magnetism wagon detector serious leakage, the pressure equilibrium inside and outside annular seal space is utilized to form new annular seal space, PCBA and battery are positioned at this new annular seal space, substantially can stop the possibility of PCBA and battery immersion, further increase the water resistance of earth magnetism wagon detector;
3, fix PCBA with PCBA fastener, be convenient to assemble fixing PCBA, and be convenient to forward assembling earth magnetism wagon detector, and earth magnetism wagon detector is installed in inversion afterwards;
4, adopt location supporting piece hold up support, avoid assembling, transport time PCBA contact with housing bottom, wear and tear pcb board and on device, ease of assembly, transport;
5, dop upwards supports an angle or a limit of PCBA, shell fragment then extruding downwards fixes this angle or limit, after earth magnetism wagon detector is installed in inversion, be angle or limit that shell fragment then upwards holds up PCBA, play the effect of damping, the problem such as the device contacts that the vibrations avoiding vehicle frequently to cross causing cause is bad;
6, battery tray establishes arc flap, after earth magnetism wagon detector is installed in inversion, by the shore supports arc flap of cap bottom surface, when being given a shock, arc flap elastic telescopic, further damping, the problem such as the device contacts that the vibrations avoiding vehicle frequently to cross causing cause is bad;
7, with the first positioning table/the first positioning port coupling of first positioning port/the first positioning table of PCBA mono-jiao and one jiao, support, the second positioning table one of support side with the second positioning port one of housing sidewall mates, the second positioning port two coupling of the second positioning table two of support opposite side and housing sidewall, the direction of traffic defined in arrow points earth magnetism wagon detector algorithm when having ensured assembling on outside bottom surface, reaches 3 grades of mistake proofings;
8, installation is inverted, when making earth magnetism wagon detector seepage, water pours in by down, upper immersion first, like this, when seepage is not serious, the water yield is little, soaks less than top, and seepage serious time, the pressure equilibrium inside and outside seal chamber can be utilized to form new seal chamber, provide condition, to improve the water resistance of earth magnetism wagon detector for substantially stopping PCBA immersion.
Accompanying drawing explanation
Fig. 1 is the fractionation structural representation of the embodiment of the present invention one earth magnetism wagon detector;
Fig. 2 is the structural representation of the support of the embodiment of the present invention one earth magnetism wagon detector.
Embodiment
Basic thought of the present invention is: PCBA generally has water-proof coating, has certain adaptability, thus, for the leakage scenarios except causing PCBA and directly soaking, substantially can not cause irreversible damage to PCBA to the large working environment that waits of moisture.Given this, the situation that in use PCBA of earth magnetism wagon detector directly soaks is badly in need of stopping.And cap and housing joining place are the normal positions of sending out of seepage, visible, in the embodiment of the present invention, the support described in described shore supports when being inverted described seal chamber, namely when being inverted installation earth magnetism wagon detector, the pillar on earth magnetism wagon detector cap is made to hold up support, battery and PCBA are positioned at seal chamber top, during seepage, water enters from the cap be positioned at bottom seal chamber and housing joining place, as long as seepage is not serious, pour in water level when not reaching battery and the residing height of PCBA, battery and PCBA can not be dipped into; And when there is cap and case weld place serious leakage, water pours in from bottom to top, gas in seal chamber is pressed to housing bottom, when by described in the pressure=atmospheric pressure+wagon detector of the pressure of the gas that compresses+the pour in water of seal chamber during water environment pressure, can at former seal chamber top, namely battery and PCBA present position, form new seal chamber, battery and PCBA can be avoided to be immersed in water, and then substantially to have stopped PCBA by the possibility of soaking.
Concrete, the fractionation structure of the embodiment of the present invention one earth magnetism wagon detector as shown in Figure 1, comprising: PCBA1, battery 2, support 3 and shell 4; Shell 4 comprises housing 41 and cap 42, and housing 41 and cap 42 are welded together to form seal chamber; Described PCBA1 and battery 2 are fixed on support 3, are sealed in described seal chamber together with support 3; Described cap 42 bottom surface is provided with pillar 421, and this pillar 421 contacts with described support 3 but do not extrude, and this pillar 421 supports described support 3 when being inverted described seal chamber.Wherein,
Describedly be welded as ultrasonic soldering.Sealing wire can be arranged at cap 42 bottom edge or housing 41 sidewall end face.Sealing wire be designed to prior art, repeat no more herein.
Support is located in addition in described support 3 both sides; The side wall inner surfaces corresponding positions of described housing 41 is equipped with location supporting piece; Accordingly,
Described support 3 is sealed in described seal chamber and comprises: described location support embeds described location supporting piece, and support 3 does not contact with bottom housing 41.
Described support 3 one end is PCBA fastener 31, and the other end is battery tray 32; Accordingly,
Described PCBA1 and battery 2 are fixed on described support 3 and are specially,
Described PCBA1 is fixed on PCBA fastener 31, and described battery 2 is fixed in battery tray 32.
Further, as shown in Figure 2, described PCBA fastener 31 comprises at least four symmetrical between two sub-fasteners; Accordingly,
Described PCBA1 is fixed on PCBA fastener 31: each subcard part fixes an angle or a limit of PCBA1; Wherein,
Described subcard part comprises dop 311 and shell fragment 312, and dop 311 upwards supports an angle or a limit of PCBA1, and 312, shell fragment downwards extruding fixes this angle or limit;
Here, after earth magnetism wagon detector is installed in inversion, be angle or limit that 312, shell fragment upwards holds up PCBA1, play the effect of damping, the problem such as device and pcb board loose contact on the PCBA1 that the vibrations avoiding vehicle frequently to cross causing cause;
Further, the side of each described subcard part all can arrange the first baffle plate 313, to fix PCBA1 further, prevents PCBA1 horizontal slip.
Described battery tray 32 comprises base 321, and the arc flap 322 that the relative both sides of base 321 extend upward; Accordingly,
Described battery 2 is fixed in battery tray 32 and comprises: base 321 support cells 2, two arc flap 322 hugs this battery 2 self-contained battery 2 common with base 321; Accordingly,
Cap 42 bottom surface is provided with two described pillars 421, lay respectively at two positions corresponding with described arc flap 322 on cap 42 bottom surface, when the embodiment of the present invention one earth magnetism wagon detector has been assembled, arc flap 322 extrados that each described pillar 421 is corresponding with self contacts but does not extrude; And installing and using the embodiment of the present invention for the moment, under described pillar 421 is supported on arc flap 322 extrados of self correspondence, hold up described support 3, make to be fixed on PCBA1 on support 3 and battery is positioned at seal chamber top.
Described base 321 is equipped with second baffle 323 with the adjacent both sides of extending arc flap 322, with further self-contained battery 2, prevents battery 2 horizontal slip.
For practical function: when the pressure equilibrium inside and outside earth magnetism wagon detector serious leakage, seal chamber forms new seal chamber, PCBA1 and battery 2 are all positioned at this new seal chamber and do not soak, and the ponding situation of the height of described seal chamber and the environment for use of earth magnetism wagon detector, the upper surface of battery 2 are to the following formula of distance demand fulfillment of housing 41 bottom surface inside surface:
Wherein, P is atmospheric pressure, and ρ is the density of water, and g is acceleration of gravity, h
sfor the height of seal chamber, h
xfor the upper surface of battery 2 is to the distance of housing 41 bottom surface inside surface, h
jfor the height of the ponding water surface to described housing 41 inner bottom surface on rear road surface installed by earth magnetism wagon detector.
The mistake proofing design that the embodiment of the present invention one earth magnetism wagon detector also includes assembling, installs, concrete,
When the direction of traffic defined in the embodiment of the present invention one earth magnetism wagon detector algorithm is the x-axis positive dirction of geomagnetic sensor on PCBA1, assembling, the mistake proofing of installing design specific as follows:
Described PCBA1 mono-jiao is provided with the first positioning port, and 3 one jiaos, described support is provided with the first positioning table, and this first positioning table embeds the first positioning port; Described location support comprises the first location support and the second location support, be divided into support 3 both sides, described location supporting piece comprises the first location supporting piece and the second location supporting piece, and this first location support embeds the first location supporting piece, and the second location support embeds the second location supporting piece;
Accordingly,
There is arrow the described outside bottom surface of housing 41, and when described support 3 is assembled on housing 41, this arrow points is fixed on the x-axis positive dirction of geomagnetic sensor on the PCBA1 in this housing 41.Or,
Described PCBA1 mono-jiao is provided with the first positioning table, and 3 one jiaos, described support is provided with the first positioning port, and this first positioning table embeds the first positioning port; Described location support comprises the first location support and the second location support, be divided into support 3 both sides, described location supporting piece comprises the first location supporting piece and the second location supporting piece, and this first location support embeds the first location supporting piece, and the second location support embeds the second location supporting piece;
Accordingly,
There is arrow the described outside bottom surface of housing 41, and when described support 3 is assembled on housing 41, this arrow points is fixed on the x-axis positive dirction of geomagnetic sensor on the PCBA1 in this housing 41.Wherein,
Earth magnetism wagon detector related algorithm be embodied as prior art, repeat no more herein.
When the direction of traffic defined in the embodiment of the present invention one earth magnetism wagon detector algorithm is the y-axis positive dirction of geomagnetic sensor on PCBA1, assembling, the mistake proofing of installing design specific as follows:
Described PCBA1 mono-jiao is provided with the first positioning table, and 3 one jiaos, described support is provided with the first positioning port, and this first positioning table embeds the first positioning port; Described location support comprises the first location support and the second location support, be divided into support 3 both sides, described location supporting piece comprises the first location supporting piece and the second location supporting piece, and this first location support embeds the first location supporting piece, and the second location support embeds the second location supporting piece; Accordingly,
There is arrow the described outside bottom surface of housing 41, and when described support 3 is assembled on housing 41, this arrow points is fixed on the y-axis positive dirction of the geomagnetic sensor on the PCBA1 of this housing 41.Or,
Described PCBA1 mono-jiao is provided with the first positioning port, and 3 one jiaos, described support is provided with the first positioning table, and this first positioning table embeds the first positioning port; Described location support comprises the first location support and the second location support, be divided into support 3 both sides, described location supporting piece comprises the first location supporting piece and the second location supporting piece, and this first location support embeds the first location supporting piece, and the second location support embeds the second location supporting piece; Accordingly,
There is arrow the described outside bottom surface of housing 41, and when described support 3 is assembled on housing 41, this arrow points is fixed on the y-axis positive dirction of the geomagnetic sensor on the PCBA1 of this housing 41.
The installation method of the embodiment of the present invention two earth magnetism wagon detector, comprising:
Hole on road upper strata;
Described earth magnetism wagon detector end face is downward, bottom surface is upwards inverted in the hole;
Fixed sealing material magnetic vehicle detecting device is regularly filled in the gap in earth magnetism wagon detector and described hole.Wherein,
The described detecting device of magnetic vehicle regularly comprises: in the gap in earth magnetism wagon detector and described hole, pour into casting glue; Or,
At bottom place mat dry cement or the fine sand soil in described hole, pour into casting glue in the gap of earth magnetism wagon detector and described hole sidewall; Or,
At bottom place mat dry cement or the fine sand soil in described hole, and at the gap-fill dry cement of earth magnetism wagon detector and described hole lower sidewall or fine sand soil, pour into casting glue in the gap of earth magnetism wagon detector and described hole side wall upper part.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (10)
1. an earth magnetism wagon detector, comprising: PCBA, battery, support and shell; Described shell comprises housing and cap, and cap forms seal chamber together with case weld; Described PCBA and battery are fixed on the bracket, are sealed in described seal chamber together with support; It is characterized in that, described cap bottom surface is provided with pillar, and this pillar contacts with described support but do not extrude, and be inverted described seal chamber time this shore supports described in support.
2. earth magnetism wagon detector according to claim 1, is characterized in that, support is located in addition in described support both sides; The side wall inner surfaces corresponding positions of described housing is equipped with location supporting piece; Accordingly,
Described support is sealed in described seal chamber and comprises: described location support embeds described location supporting piece, and support does not contact with housing bottom.
3. earth magnetism wagon detector according to claim 1 and 2, is characterized in that, described support one end is PCBA fastener, and the other end is battery tray; Accordingly,
Described PCBA and battery are fixed and are specially on the bracket,
Described PCBA is fixed on PCBA fastener, and described battery is fixed in battery tray.
4. earth magnetism wagon detector according to claim 3, is characterized in that, described PCBA fastener comprises at least four symmetrical between two sub-fasteners; Accordingly,
Described PCBA is fixed on PCBA fastener: each subcard part fixes an angle or a limit of PCBA; Wherein,
Described subcard part comprises dop and shell fragment, and dop upwards supports an angle or a limit of PCBA, and shell fragment then extruding downwards fixes this angle or limit.
5. earth magnetism wagon detector according to claim 3, is characterized in that, described battery tray comprises base, and the arc flap that the relative both sides of base extend upward; Accordingly,
Described battery is fixed in battery tray and comprises: base supports described battery, and two arc flaps then hug this battery and the common self-contained battery of base; Accordingly,
Described pillar contacts with described support but does not extrude and is specially,
The arc flap extrados that described pillar is corresponding with self contacts but does not extrude;
Described in described shore supports, support is specially,
Described shore supports is under the arc flap extrados of self correspondence.
6. earth magnetism wagon detector according to claim 5, is characterized in that, the upper surface of the height of described seal chamber and the ponding situation of environment for use, battery meets following formula to the distance of housing bottom surface inside surface:
Wherein, P is atmospheric pressure, and ρ is the density of water, and g is acceleration of gravity, h
sfor the height of seal chamber, h
xfor the upper surface of battery is to the distance of housing bottom surface inside surface, h
jfor the height of the ponding water surface to described housing inner bottom surface on rear road surface installed by earth magnetism wagon detector.
7. earth magnetism wagon detector according to claim 2, is characterized in that, described PCBA mono-jiao is provided with the first positioning port/the first positioning table, and one jiao, described support is provided with the first positioning table/the first positioning port, and this first positioning table embeds the first positioning port; Described location support comprises the first location support and the second location support, be divided into support both sides, described location supporting piece comprises the first location supporting piece and the second location supporting piece, and this first location support embeds the first location supporting piece, and the second location support embeds the second location supporting piece;
Accordingly,
There is arrow described outside bottom surface, and when described bracket assembled is on housing, this arrow points is fixed on the x-axis positive dirction of geomagnetic sensor on the PCBA in this housing.
8. earth magnetism wagon detector according to claim 2, is characterized in that, described PCBA mono-jiao is provided with the first positioning port/the first positioning table, and one jiao, described support is provided with the first positioning table/the first positioning port, and this first positioning table embeds the first positioning port; Described location support comprises the first location support and the second location support, be divided into support both sides, described location supporting piece comprises the first location supporting piece and the second location supporting piece, and this first location support embeds the first location supporting piece, and the second location support embeds the second location supporting piece; Accordingly,
There is arrow described outside bottom surface, and when described bracket assembled is on housing, this arrow points is fixed on the y-axis positive dirction of the geomagnetic sensor on the PCBA of this housing.
9. the installation method of earth magnetism wagon detector according to claim 1, it is characterized in that, the method comprises:
Hole on road upper strata;
Described earth magnetism wagon detector end face is downward, bottom surface is upwards inverted in the hole;
Fixed sealing material magnetic vehicle detecting device is regularly filled in the gap in earth magnetism wagon detector and described hole.
10. the installation method of earth magnetism wagon detector according to claim 9, is characterized in that, the described detecting device of magnetic vehicle regularly comprises: in the gap in earth magnetism wagon detector and described hole, pour into casting glue; Or,
At bottom place mat dry cement or the fine sand soil in described hole, pour into casting glue in the gap of earth magnetism wagon detector and described hole sidewall; Or,
At bottom place mat dry cement or the fine sand soil in described hole, and at the gap-fill dry cement of earth magnetism wagon detector and described hole lower sidewall or fine sand soil, pour into casting glue in the gap of earth magnetism wagon detector and described hole side wall upper part.
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| CN203910038U (en) * | 2014-04-29 | 2014-10-29 | 广东艾科技术股份有限公司 | Underground type terrestrial magnetism detector |
| CN203981197U (en) * | 2014-06-23 | 2014-12-03 | 安徽宁致电子科技有限公司 | The shell of applicable magnetic survey detecting device |
| CN204097909U (en) * | 2014-09-17 | 2015-01-14 | 新疆华赛信息技术有限公司 | A kind of wireless geomagnetism wagon detector shell |
| CN204808590U (en) * | 2015-07-22 | 2015-11-25 | 青岛海信网络科技股份有限公司 | Earth magnetism detector |
| CN205354353U (en) * | 2015-12-28 | 2016-06-29 | 迈锐数据（北京）有限公司 | Earth magnetism vehicle detector |
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