CN208745993U - A kind of locomotive sand-spraying control cabinet - Google Patents
A kind of locomotive sand-spraying control cabinet Download PDFInfo
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- CN208745993U CN208745993U CN201821288014.8U CN201821288014U CN208745993U CN 208745993 U CN208745993 U CN 208745993U CN 201821288014 U CN201821288014 U CN 201821288014U CN 208745993 U CN208745993 U CN 208745993U
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- stucco
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Abstract
The utility model discloses a kind of locomotive sand-spraying control cabinets, belong to railway locomotive technical field.Including cabinet and it is set to the intracorporal DC converter of case, control module and stucco relay, cabinet has power supply interface, baroceptor connecting interface, stucco electric pneumatic valve connecting interface, speed signalling interface and stucco signaling interface, the input terminal of DC converter is connect with power supply interface, the output end of DC converter is connect with control module and stucco electric pneumatic valve connecting interface respectively, speed signalling interface, stucco signaling interface, baroceptor connecting interface and stucco relay control terminal connect with control module.The utility model is simple in sturcture, ingenious in design, easy to implement, is conducive to the automatization level for promoting existing locomotive sand-spraying system, and then improve the stability and safety of locomotive operation.
Description
Technical field
The utility model relates to a kind of locomotive sand-spraying control cabinets, belong to railway locomotive technical field.
Background technique
When locomotive traction, driving wheel active force will generate idle running on rail, lead locomotive if it is greater than adhesion strength, wheel
Gravitation, which sharply declines, even to disappear, and serious person leads to traction motor failure.
Adhesion strength between train wheel and rail is affected by various factors.Locomotive is started to walk in tractor-trailer train, accelerates, is rushed
In the case that slope operation etc. needs to increase tractive force, frost is especially operated in, snow, ice, water, grease, wheel tread lose circle, rail
When under the situations such as damage, generation axle weight transfer, it is easy to appear idle running between wheel and rail, skids, leading for idler shaft occurs
Gravitation sharply declines, and then influences the performance of the entire hauling capacity of a locomotive.At this point, by the equably stucco on Rail Surface, it can
To improve the adhesion strength of locomotive, the idle running of wheel is eliminated, gives full play to the tractive force of locomotive.
Currently, the sander of electric power, diesel locomotive mainly by sandbox, sanding valve, sand pipe, compressed air line, spread
The components such as sand electric pneumatic valve composition.The effect of sandbox is the qualified sand of storage；Sanding valve is the critical component of locomotive sand spraying device,
Effect is that the sand in sandbox is blowed floating and equably sprayed out by the compressed air provided when needing stucco using locomotive itself
Come；The effect of sand pipe is that the sand of raising for spraying out sanding valve is oriented between locomotive wheel and rail；Compressed air line effect
It is to use the compressed air supply sanding valve of locomotive main air reservoir output；The effect of stucco electric pneumatic valve is to turn on or turns off to lead to and spread
The compressed air of sand valve, stucco electric pneumatic valve turn on and off, and are by electric appliance (oneself related on driver's (manually controlling) or locomotive
Dynamic control) control.
Above-mentioned stucco control mode is relatively simple.When needing stucco, driver presses stucco button, and control stucco electricity is empty
Valve obtains electric, actuation, opens the compressed air gas circuit led under vehicle, and sanding valve blows out sand under pressure.But locomotive
State changes at any time, and single mode controls stucco process, and there is drawbacks.With in practice, driver will be according to train traction
Control actual stucco amount after state, the speed of service, weather conditions comprehensive descision by way of manually controlling again, it is therefore an objective to
One layer of thin sand is equably covered between wheel and rail, this is more satisfactory state.But in the actual operation process,
Even veteran high level driver is also extremely difficult to such ideal stucco result.Stucco amount is too small, then can not provide
Enough frictional force；Stucco amount is excessive, can not efficiently solve the idle running of wheel, also will increase additional resistance, band instead
Carry out many negative consequences.In addition, stucco amount is excessive to be also added when opening vehicle again when implementation emergency braking locomotive closes on parking
Resistance.
For this purpose, automatic improving can be carried out to existing locomotive, but control panel not ready-made in the prior art can
To meet the needs of the automatic stucco of locomotive.
Utility model content
Aiming at the problems existing in the prior art, it the utility model proposes a kind of locomotive sand-spraying control cabinet, can install
In existing locomotive, as a part of locomotive automation stucco transformation, hardware supported is provided for the automatic stucco of locomotive.
To achieve the goals above, the utility model provides the following technical solutions:
A kind of locomotive sand-spraying control cabinet comprising cabinet and set on the intracorporal DC converter of case, control module and spread
Sand relay, the cabinet have power supply interface, baroceptor connecting interface, stucco electric pneumatic valve connecting interface, speed signal
Interface and stucco signaling interface, the input terminal of the DC converter are connect with the power supply interface, the DC converter
Output end is connect with control module and stucco electric pneumatic valve connecting interface respectively, and the stucco relay is for controlling stucco electric pneumatic valve
The on-off of connecting interface, the speed signalling interface, stucco signaling interface, baroceptor connecting interface and stucco relay
Control terminal connect with the control module.
Optionally, be additionally provided with excision switch on the cabinet, excision switch be connected to the stucco signaling interface and
On circuit between the control module.
Optionally, touch screen is additionally provided on the cabinet, the touch screen is connect with the control module.
Optionally, between the speed signalling interface and the control module and the stucco signaling interface with it is described
Photoelectric isolating circuit is equipped between control module.
Optionally, the input voltage of the DC converter is 110 volts, and output voltage is 24 volts, in the control module
Equipped with the power circuit for 24 volts of voltages to be converted to 5 volts of voltage.
Optionally, the stucco relay is two, respectively preceding to stucco relay and backward stucco relay, described
Speed signalling interface includes front-wheel speed signalling interface and rear-wheel speed signalling interface, and the stucco signaling interface includes preceding to spreading
Sand signaling interface and backward stucco signaling interface, the baroceptor connecting interface include preceding to the connection of stucco baroceptor
Interface and backward stucco baroceptor connecting interface, the stucco electric pneumatic valve connecting interface include preceding to the connection of stucco electric pneumatic valve
Interface and backward stucco electric pneumatic valve connecting interface；There are four air plug interfaces for tool on the cabinet, wherein forward direction stucco air pressure sensing
Device connecting interface and forward direction stucco electric pneumatic valve connecting interface are set in the first air plug interface, and backward stucco baroceptor connects
Mouth and backward stucco electric pneumatic valve connecting interface are set in the second air plug interface, and front-wheel speed signalling interface and rear-wheel speed signal connect
Mouth is set in third air plug interface, and power supply interface, forward direction stucco signaling interface and backward stucco signaling interface are set to the 4th air plug
In interface.
From narration above as can be seen that the beneficial effect of technical solutions of the utility model is:
The utility model can be used for being transformed upgrading to the stucco control system of existing locomotive.Specifically, this control
Case needs to be fitted to the sub-control box in the original stucco gas circuit of locomotive.The sub-control box is used in the original stucco gas circuit of locomotive
It connects a stucco electric pneumatic valve, and wind pressure sensor is set in the front end of stucco electric pneumatic valve.When transformation, by stucco electric pneumatic valve and wind
The circuit interface of pressure sensor is connect with the stucco electric pneumatic valve connecting interface of this control cabinet and baroceptor connecting interface respectively,
And the power supply interface of this control cabinet, speed signalling interface and stucco signaling interface are passed with the power supply of locomotive itself, axle speed respectively
Sensor and stucco switch connection, the relevant information of locomotive can be acquired by control cabinet, and control sub-control box and realize to stucco
The automatic control of journey.
Specifically, the principle of the automatic stucco control based on the utility model is as follows: ideally, stucco amount should be with
Locomotive speed is at certain proportionate relationship, and when speed is slow, stucco amount is small, and when speed is fast, stucco amount is big.The inventor of this patent is logical
Cross theoretical research and a large amount of simulated experiment discovery, in the case where wind pressure is certain, the opening time of locomotive electric pneumatic valve and stucco
Amount is substantially proportional to relationship.Meanwhile the size of wind pressure also has a certain impact to stucco amount, can be fitted outlet air by many experiments
The curved line relation of pressure and stucco amount.Therefore, opening for stucco electric pneumatic valve can be controlled in a manner of PWM wave according to wind pressure and speed
The time is opened, to control stucco amount.
As it can be seen that the utility model structure is simple, integrated level is high, convenient for deployment, can be directly installed on and existing spread manually
It is very easy to use without doing excessive transformation to existing locomotive on sand locomotive, it is easy to promote and utilize.Also, by control mould
Program appropriate is loaded in block, and the automation control of locomotive sand-spraying may be implemented, greatly promote the accuracy of stucco amount, improve
The security reliability of locomotive driving.In addition, the utility model is further provided with Phototube Coupling electricity in the periphery of control module
Road, photoelectric isolating circuit can play the role of insulation blocking to the original circuit of locomotive, ensure the original electrical system of locomotive
It is unaffected.Further, excision switch can also be arranged in the utility model between stucco signal and control module.In this way,
By way of disconnecting switch, stucco signal can be separated, the extention in the utility model compared with the existing technology is complete
Full excision, to restore the original stucco control structure of locomotive.
In short, the utility model structure is simple, and it is easy to implement, be conducive to the Automated water for promoting existing locomotive sand-spraying system
It is flat, and then improve the stability and safety of locomotive operation.Meanwhile using the utility model can be convenient to existing locomotive into
Row transformation and upgrade, to make the utility model that there is extremely strong application prospect and economic benefit.
Detailed description of the invention
In order to clearly describe this patent, one or more attached drawing is provided below.
Fig. 1 is the structural block diagram of entire control structure in the utility model embodiment；
Fig. 2 is the structural schematic diagram of sub-control box in the utility model embodiment；
Fig. 3~7 are several electrical block diagrams in the utility model embodiment；
Fig. 8 is a kind of use state structural block diagram of the utility model embodiment.
Specific embodiment
Understanding for the ease of those skilled in the art to the art of this patent scheme, below to this in the form of concrete case
The technical solution of patent is described further.
Fig. 1 show a kind of locomotive sand-spraying control device including electric cabinet and sub-control box, wherein sets in sub-control box
There are wind pressure sensor and stucco electric pneumatic valve, sub-control box has gas circuit entrance, gas circuit outlet and circuit interface, the connection of stucco electric pneumatic valve
Between the gentle way outlet of gas circuit entrance, wind pressure sensor is set between gas circuit entrance and stucco electric pneumatic valve, and circuit interface includes
The sensor interface being connected with wind pressure sensor and the electric pneumatic valve interface being connected with stucco electric pneumatic valve, stucco electric pneumatic valve are in normal
Open state；DC-DC DC converter, control module and stucco relay are equipped in electric cabinet, electric cabinet has power supply interface, passes
Sensor connecting interface, electric pneumatic valve connecting interface, speed signalling interface, stucco signaling interface, the input terminal of DC converter and confession
Electrical interface connection, the output end of DC converter are connect with control module and electric pneumatic valve connecting interface respectively, and stucco relay is used
In control electric pneumatic valve connecting interface on-off, speed signalling interface, stucco signaling interface, sensor connecting interface and stucco after
The control terminal of electric appliance is connect with control module；Electric pneumatic valve interface is connect with electric pneumatic valve connecting interface, sensor interface and sensing
The connection of device connecting interface.
Specifically, as shown in Fig. 2, sub-control box includes cabinet 1 and wind pressure sensor 4, stucco electricity in cabinet 1
Empty valve 3 and valve block 2, valve block 2 have a gentle way outlet 22 of gas circuit entrance 21, and wind pressure sensor 4 and stucco electric pneumatic valve 3 are and valve block
2 connections, and wind pressure sensor 4 and 3 sequential series of stucco electric pneumatic valve are between the gentle way outlet 22 of gas circuit entrance 21.Wind pressure sensing
Device 4 has a lead 40, and stucco electric pneumatic valve 3 has a lead 30, lead 40 and lead 30 with four core circuit interfaces 11 on cabinet 1
Connection.Entire cabinet 1 only has gas circuit entrance 21, gas circuit outlet 22 and circuit interface 11 totally three external interfaces.In addition, to reinforce
Also gasket can be arranged between stucco electric pneumatic valve 3 and valve block 2 in leakproofness.
In use, electric cabinet can be arranged in locomotive control room, by the speed interface of electric cabinet and the axle speed of locomotive
Sensor connection, power supply interface is connect with electrical locomotive power, by the stucco pedal or stucco button of stucco signaling interface and locomotive
Connection.Meanwhile sub-control box is set to locomotive bottom close to the position of stucco, the original pneumatic circuit of locomotive is truncated, will be cut
Disconnected pipeline is connect with the gentle way outlet of gas circuit entrance of sub-control box respectively, so that sub-control box is connected on the original stucco of locomotive
In gas circuit.
By working out program appropriate, the control device can be made to realize the automatic control to locomotive sand-spraying amount.It is specific next
It says, following procedure can be run in the control module:
(1) stucco pedal signal is detected；
(2) when receiving pedal signal, the pulse signal of the shaft speed sensor of locomotive is introduced, pulse signal is by controlling
Timer count in module is simultaneously converted to speed v；Meanwhile the wind pressure p of respective line is obtained by wind pressure sensor；
(3) stucco amount w is calculated according to the proportional relation of speed and the amount of sanding, i.e. w=k × v, k are proportionality coefficient；
(4) pwm pulse fixed to the stucco electric pneumatic valve of the sub-control box output period controls signal, in a cycle T, stucco
The opening time of electric pneumatic valve is t, then the shut-in time of stucco electric pneumatic valve is T-t；Wherein:
t1=f1(w, p),
t2=f2(w, p),
f1And f2It is the binary quadratic polynomial about w and p.
When pedal is stepped on, the original stucco electric pneumatic valve of locomotive is in the open state, and present apparatus stucco electric pneumatic valve is then by controlling
Module carries out automatically controlling, according to the calculated opening/closing time of control module, present apparatus stucco electric pneumatic valve can control by
Air supply, and then control stucco amount.
In general, cycle T can be set as 1500 milliseconds, certainly, can also be set as other according to the actual situation rationally
Numerical value.
Optionally, still see Fig. 1, excision switch is additionally provided on electric cabinet, excision switch is connected to stucco signaling interface and control
On circuit between molding block.Excision switch can control the access of stucco signal, when the present apparatus breaks down, or not need
When the present apparatus is controlled, the present apparatus can be cut off from entire stucco control system by way of disconnecting excision switch.
Since the stucco electric pneumatic valve in sub-control box is in normally open, after cutting off the present apparatus, the stucco gas circuit of locomotive is only by locomotive
The control of original stucco electric pneumatic valve, the present apparatus will not have any impact to original control mode of locomotive.
Optionally, touch screen is additionally provided on electric cabinet, touch screen is connect with control module.Touch screen provides people for electric cabinet
Machine interactive interface.By human-computer interaction interface, the parameter in control process can be configured and be adjusted, and can detecte control
The operating status of system processed.
Optionally, the circuit interface of sub-control box is the four core sockets collectively constituted by sensor interface and electric pneumatic valve interface,
Sensor connecting interface and electric pneumatic valve connecting interface collectively constitute a four core air plug interfaces being located on electric cabinet.
Optionally, it is all provided between speed signalling interface and control module and between stucco signaling interface and control module
There is photoelectric isolating circuit.Certainly, photoelectric isolating circuit can also be integrated in same PCB circuit board jointly with control module.Light
Electric isolating circuit is the prior art, and details are not described herein again.Photoelectric isolating circuit can play isolation to the original circuit of locomotive and protect
The effect of shield, that is, the automatically controlled box part in this example will not influence the electric property of the original circuit of locomotive completely, to ensure locomotive
The reliable and stable operation of original electrical system.
Optionally, the input voltage of DC-DC DC converter is 110 volts, and output voltage is 24 volts, and control module is equipped with
For 24 volts of voltages to be converted to the power circuit of 5 volts of voltage.The power input of DC converter can be mentioned directly using train
The 110V direct current of confession does not need external other power supplys.The DC converter can using one piece meet EN50155 and
The EN45545-2 railway system certification DC-DC converter, the converter have short circuit, overload, over-voltage, overheat, input protect,
The functions such as input and output isolation, have wider voltage power supply range, ensure that the stability of system work.
In above-mentioned each example, control module can be using ARM single-chip microcontroller as main part, DC-DC DC converter and machine
Vehicle power supply connection, for locomotive 110V power supply to be converted to 24V power supply.
Specifically, the control core of control module can choose the Cortex-M3 processor of mainstream, which possesses
The problem of 72M dominant frequency, 20K RAM, 64K ROM, built-in house dog will not crash.Multiple timers built in the processor,
Accurately calculating speed line pulse can be sampled, calculate speed.12 ADC, with detection wind pressure, detection speed it is fast.Built-in
64KRAM meets the storage of real time data.By writing storage polling routine, data storage can achieve thousands of times.
Fig. 3 show the power circuit of control module, uses DC-DC chip, and 24V power supply is converted to 5V power supply, from
And it is the power supply such as control and detection circuit.
Fig. 5 show the control circuit of present apparatus stucco electric pneumatic valve, is realized by triode and relay, single-chip microcontroller output
Low and high level controls the on-off of triode Q4, to control the switch of relay JDQ1, relay controls the switch of electric pneumatic valve again.
Fig. 6 show the stucco signal deteching circuit in control module, and the signal that sands is 110V level signal, defeated by J7
Enter to photoelectric isolated chip 6N136, is converted to 3.3V level signal by VO pin and is output to single-chip microcontroller.Photoelectric isolated chip one
Aspect plays signal isolation, on the other hand also functions to the effect of level conversion.
Fig. 7 show the speed signal detection circuit in control module, and speed signal is two-way quadrature coding pulse signal,
It is inputted respectively by J5, J6, the encoder interfaces of single-chip microcontroller is input to by two-way photoelectric isolated chip.
The range of wind pressure sensor is 0~1.6MPa, and signal type is 4~20mA, and working range is 0.1~1.6 megapascal.
Fig. 4 is shown in control module for handling the circuit of wind pressure sensor signal, the current signal of wind pressure sensor
It for 4~20mA, is inputted by J1, is converted to 600~3000mV voltage signal by 150 Ohmic resistances, is input to the ADC of single-chip microcontroller
Port.
Present apparatus stucco electric pneumatic valve can use the normally opened electric pneumatic valve of locomotive.
In the prior art, locomotive head generally has there are four stucco position, i.e. the near front wheel, off-front wheel, left rear wheel and the right side
Rear-wheel, this is just corresponding, and there are four sandboxes, wherein the sandbox of the near front wheel and off-front wheel shares a stucco electric pneumatic valve, part knot
Structure be referred to as before to stucco, the sandbox of left rear wheel and off hind wheel shares another stucco electric pneumatic valve, after which is referred to as
To stucco.Meanwhile stucco pedal (or stucco button) is generally two, to stucco and backward stucco before respectively corresponding.Actually answer
In, before sub-control box being separately positioned on on the stucco electric pneumatic valve main line of stucco and backward stucco (as shown in Figure 8).
At this point, still seeing Fig. 1, the two sub-control box can share an electric cabinet, should include two in electric cabinet correspondingly
Cover control circuit.Specifically, stucco relay is two, respectively preceding to stucco relay and backward stucco relay, vehicle
Fast signaling interface includes front-wheel speed signalling interface and rear-wheel speed signalling interface, and stucco signaling interface includes preceding to stucco signal
Interface and backward stucco signaling interface, baroceptor connecting interface include preceding to stucco baroceptor connecting interface and backward
Stucco baroceptor connecting interface, stucco electric pneumatic valve connecting interface include preceding to stucco electric pneumatic valve connecting interface and backward stucco
Electric pneumatic valve connecting interface
It can respectively be connect by each interface organization of the electric cabinet at four air plug interfaces (respectively with 1#, 2#, 3#, 4# definition)
Mouthful set-up mode can (locomotive in following each tables refers to SS as given a definition4No. 0778 locomotive):
1 direction of advance stucco of table controls 1# air plug (4 line)
2 direction of retreat stucco of table controls 2# air plug (4 line)
Table 33# air plug (7 line)
Table 44# air plug (5 line)
The utility model control cabinet has extremely strong integration and ease for use.The original stucco system of locomotive is transformed
When, only need to be additionally arranged at the bottom sub-control box in locomotive, original gas circuit is truncated and connects with sub-control box, at the same by corresponding conducting wire with it is automatically controlled
Case connection.In this way, entire transformation process is simple and easy, this is but also the utility model is highly convenient for promotion and application.Together
When, it can also ensure that the utility model and locomotive original structure keep opposite by the design of photoelectric isolating circuit and disconnect switch
It is independent, the utility model can be cut off completely from entire control system when necessary, without influencing, locomotive is original to be spread
The normal operation of sand control system.
In short, the utility model is simple in sturcture, ingenious in design, and it is easy to implement, be conducive to promote existing locomotive sand-spraying system
Automatization level, and then improve locomotive operation stability and safety.Meanwhile the utility model is easy to apply, it can be right
Existing locomotive is transformed upgrading, has extremely strong application prospect and economic benefit.
It should be pointed out that the above specific embodiment is the specific case of this patent implementation, without also can not
All implementations of this patent can be covered, therefore the restriction to the scope of this patent cannot be regarded as；All and above case
Belong to the implementation of same idea or the assembled scheme of above-mentioned several schemes, within the protection domain of this patent..
Claims (6)
1. a kind of locomotive sand-spraying control cabinet, it is characterised in that: including cabinet and be set to the intracorporal DC converter of case, control mould
Block and stucco relay, the cabinet have power supply interface, baroceptor connecting interface, stucco electric pneumatic valve connecting interface, vehicle
Fast signaling interface and stucco signaling interface, the input terminal of the DC converter are connect with the power supply interface, and the direct current becomes
The output end of parallel operation is connect with control module and stucco electric pneumatic valve connecting interface respectively, and the stucco relay is for controlling stucco
The on-off of electric pneumatic valve connecting interface, the speed signalling interface, stucco signaling interface, baroceptor connecting interface and stucco
The control terminal of relay is connect with the control module.
2. locomotive sand-spraying control cabinet according to claim 1, it is characterised in that: excision switch is additionally provided on the cabinet,
The excision switch is connected on the circuit between the stucco signaling interface and the control module.
3. locomotive sand-spraying control cabinet according to claim 1, it is characterised in that: be additionally provided with touch screen, institute on the cabinet
Touch screen is stated to connect with the control module.
4. locomotive sand-spraying control cabinet according to claim 1, it is characterised in that: the speed signalling interface and the control
Photoelectric isolating circuit is equipped between module and between the stucco signaling interface and the control module.
5. locomotive sand-spraying control cabinet according to claim 1, it is characterised in that: the input voltage of the DC converter is
110 volts, output voltage is 24 volts, and the control module is equipped with the power circuit for 24 volts of voltages to be converted to 5 volts of voltage.
6. locomotive sand-spraying control cabinet according to claim 1, it is characterised in that: the stucco relay is two, respectively
To be preceding to stucco relay and backward stucco relay, the speed signalling interface includes front-wheel speed signalling interface and rear-wheel vehicle
Fast signaling interface, the stucco signaling interface include preceding to stucco signaling interface and backward stucco signaling interface, the air pressure transmission
Sensor connecting interface includes preceding to stucco baroceptor connecting interface and backward stucco baroceptor connecting interface, described to spread
Sand electric pneumatic valve connecting interface includes preceding to stucco electric pneumatic valve connecting interface and backward stucco electric pneumatic valve connecting interface；On the cabinet
There are four air plug interfaces for tool, wherein forward direction stucco baroceptor connecting interface and forward direction stucco electric pneumatic valve connecting interface are set to
In first air plug interface, backward stucco baroceptor connecting interface and backward stucco electric pneumatic valve connecting interface are set to the second air plug
In interface, front-wheel speed signalling interface and rear-wheel speed signalling interface are set in third air plug interface, power supply interface, forward direction stucco
Signaling interface and backward stucco signaling interface are set in the 4th air plug interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821288014.8U CN208745993U (en) | 2018-08-10 | 2018-08-10 | A kind of locomotive sand-spraying control cabinet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821288014.8U CN208745993U (en) | 2018-08-10 | 2018-08-10 | A kind of locomotive sand-spraying control cabinet |
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| CN208745993U true CN208745993U (en) | 2019-04-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110194186A (en) * | 2019-06-19 | 2019-09-03 | 长春冠信瑞达轨道客车配件有限公司 | Electronics sand position display circuit plate |
-
2018
- 2018-08-10 CN CN201821288014.8U patent/CN208745993U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110194186A (en) * | 2019-06-19 | 2019-09-03 | 长春冠信瑞达轨道客车配件有限公司 | Electronics sand position display circuit plate |
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