CN208704093U - A kind of exhaust control system - Google Patents
A kind of exhaust control system Download PDFInfo
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- CN208704093U CN208704093U CN201820791200.7U CN201820791200U CN208704093U CN 208704093 U CN208704093 U CN 208704093U CN 201820791200 U CN201820791200 U CN 201820791200U CN 208704093 U CN208704093 U CN 208704093U
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Abstract
The utility model embodiment provides a kind of exhaust control system, is related to field of experiment equipment, to solve the problems, such as energy waste.Wherein, the exhaust control system, including air exhausting device and air supply device；Wherein, the air exhausting device includes several laboratory hoods, and the laboratory hood includes exhaust duct, air draft air-valve and air exhaust controller, and the air draft air-valve is mounted on the exhaust duct, the air exhaust controller is mounted on the air draft air-valve, and the air exhaust controller is connect with the air draft air-valve；The air supply device includes that air supply duct, air-supply air-valve and air blowing control device, the air-supply air-valve are mounted on the air supply duct, and the air blowing control device is mounted on the air-supply air-valve, and the air blowing control device is connect with the air-supply air-valve；Several described air exhaust controllers are connect with the air blowing control device.Exhaust control system provided by the utility model embodiment is applied to laboratory.
Description
Technical field
The utility model relates to field of experiment equipment, more particularly to a kind of exhaust control system.
Background technique
In some chemistry and medical laboratory, it is typically provided with vent cabinet, the dirt that vent cabinet can will generate in experimentation
Dye gas etc. is handled and is discharged in time, to guarantee the safety of the environment of experimenter and laboratory.
The working principle of vent cabinet are as follows: by polluted gas generated in experimentation etc., drained under the action of air draft logical
In wind cabinet.Therefore, because the air draft of vent cabinet acts on, negative pressure will form testing indoor confined space, to be unfavorable for dirt
Contaminate the discharge of gas etc..In order to solve this problem, it can take and mend the measure of wind in laboratory to adjust the indoor air pressure of experiment.
But benefit wind measure and the air draft of the vent cabinet work taken now are two independent operating modes, therefore are being mended
When wind, it will lead to mend that air quantity is extra, and generated energy consumption is also increase accordingly when mending wind, to cause energy waste.
Utility model content
The utility model embodiment is the technical problem to be solved is that a kind of exhaust control system is provided, to solve energy wave
The problem of taking.
To solve the above-mentioned problems, the utility model discloses a kind of exhaust control systems, including air exhausting device and air-supply
Device；Wherein, the air exhausting device includes several laboratory hoods, and the laboratory hood includes exhaust duct, air draft air-valve and air draft control
Device processed, the air draft air-valve are mounted on the exhaust duct, and the air exhaust controller is mounted on the air draft air-valve, described
Air exhaust controller is connect with the air draft air-valve；The air supply device includes air supply duct, air-supply air-valve and air blowing control device, institute
It states air-supply air-valve to be mounted on the air supply duct, the air blowing control device is mounted on the air-supply air-valve, the air-supply control
Device processed is connect with the air-supply air-valve；Several described air exhaust controllers are connect with the air blowing control device；The air draft control
Device processed works as front wind speed and current exhaust air rate for obtaining, and according to target face wind speed or target exhaust air rate, controls the air draft
The open angle of air-valve, while the current exhaust air rate that will acquire is sent to the air blowing control device；The air blowing control device is used for
The current exhaust air rate is read, and calculates the air draft total amount of the air exhausting device, while obtaining current air output, is worked as according to described
Preceding air output and the air draft total amount control the open angle of the air-supply air-valve.
Compared with prior art, the utility model embodiment includes following advantages:
In exhaust control system in the utility model embodiment, including air exhausting device and air supply device.Wherein, air draft
Device includes several laboratory hoods, and laboratory hood includes exhaust duct, air draft air-valve and air exhaust controller, for each laboratory hood, row
Wind controller can obtain corresponding laboratory hood when front wind speed, and the target face wind speed inputted in advance is compared, to air draft air-valve
The size of open angle is adjusted, and laboratory hood is made to be maintained at target face wind speed, or by when front wind speed can be obtained it is corresponding
Current exhaust air rate, and the target exhaust air rate inputted in advance is compared, the size of the open angle of air draft air-valve is adjusted, makes to arrange
Wind cabinet is maintained at target exhaust air rate, meanwhile, the current exhaust air rate real-time transmission that air exhaust controller can also will acquire to air blowing control
Device, so that the current exhaust air rate of multiple laboratory hoods, which can be all sent to, to be sent when multiple laboratory hoods in air exhausting device work at the same time
Wind controller；Air blowing control device reads the exhaust air rate of air exhaust controller transmission, and carries out summarizing calculating, finally obtains air exhausting device
Air draft total amount, air supply device air-supply when, the current air output and air draft total amount that air blowing control device will acquire are compared, root
It is adjusted according to size of the comparison result to the open angle of air-supply air-valve, so that air draft total amount and air output reach dynamic and put down
Weighing apparatus, avoids extra energy waste.It can be seen that the exhaust control system of the utility model embodiment realizes air draft dress
The linkage between air supply device is set, indoor pressure difference is effectively controlled, avoids energy waste.
Detailed description of the invention
Fig. 1 is the structural block diagram of the exhaust control system of the utility model embodiment；
Fig. 2 is the first structure block diagram of the laboratory hood of the utility model embodiment；
Fig. 3 is the working principle diagram of the exhaust control system of the utility model embodiment；
Fig. 4 is the second structural block diagram of the laboratory hood of the utility model embodiment.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
Referring to Fig. 1, the utility model embodiment provides a kind of exhaust control system, including air exhausting device 100 and air-supply
Device 200；Wherein, air exhausting device 100 includes several laboratory hoods 10, and laboratory hood 10 includes exhaust duct 11,12 and of air draft air-valve
Air exhaust controller 13, air draft air-valve 12 are mounted on exhaust duct 11, and air exhaust controller 13 is mounted on air draft air-valve 12, air draft
Controller 13 is connect with air draft air-valve 12；Air supply device 200 includes air supply duct 21, air-supply air-valve 22 and air blowing control device 23,
Air-supply air-valve 22 is mounted on the air supply duct 21, and air blowing control device 23 is mounted on air-supply air-valve 22, air blowing control device 23
It is connect with air-supply air-valve 22；Several air exhaust controllers 13 are connect with air blowing control device 23；Air exhaust controller 13 is for obtaining
When front wind speed and current exhaust air rate, and according to target face wind speed or target exhaust air rate, the open angle of air draft air-valve 12 is controlled,
The current exhaust air rate that will acquire simultaneously is sent to air blowing control device 23；Air blowing control device 23 is counted for reading current exhaust air rate
The air draft total amount of air exhausting device 100 is calculated, while obtaining current air output, according to current air output and air draft total amount, control air-supply
The open angle of air-valve 22.
In the exhaust control system of the present embodiment, including 200 two large divisions of air exhausting device 100 and air supply device.
In air exhausting device 100, including several laboratory hoods 10, several laboratory hoods 10 successively indicate different numbers,
In the work of air exhausting device 100, may be selected open laboratory hood 10 quantity, and for it is each it is in running order in air draft
Cabinet 10, corresponding air exhaust controller 13 can obtain corresponding laboratory hood 10 when front wind speed, according to acquisition when front wind speed can
The open angle of air draft air-valve 12 on exhaust duct 11 is adjusted, with control when front wind speed keeps target value；Alternatively,
It, can be to the air draft air-valve 12 on exhaust duct 11 according to current exhaust air rate by current exhaust air rate can be calculated when front wind speed
Open angle is adjusted, and keeps target value to control current exhaust air rate；And the current air draft that air exhaust controller 13 can will obtain
Real-time transmission is measured to air blowing control device 23.
The air blowing control device 23 of air supply device 200 can read the current exhaust air rate of the transmission of air exhaust controller 13 in real time, thus
Air blowing control device 23 can carry out the current exhaust air rate of multiple laboratory hoods 10 to summarize calculating, to obtain the air draft of air exhausting device 100
Total amount.For air supply device 200 in air-supply, air blowing control device 23 can obtain current air output in real time, and by current air output and row
Wind total amount is compared, and the air-supply air-valve 22 on air supply duct 21 is moderately adjusted according to the result of comparison, so that current air output
Reach dynamic equilibrium with air draft total amount.
It can be seen that the air exhaust controller 13 of the air exhausting device 100 in embodiment and the air blowing control of air supply device 200
It is connected between device 23, realizes the linkage between air exhausting device 100 and air supply device 200, thus between exhaust air rate and air output
It can reach dynamic equilibrium, under the premise of guaranteeing personnel safety, effectively control indoor pressure difference, and not will cause extra energy
Source waste.
It should be noted that air output and air draft total amount is made to reach dynamic equilibrium, need to guarantee to be negative pressure in laboratory hood 10, with
Conducive to the discharge of indoor polluted gas etc..
Illustratively, the controller in the present embodiment can be singlechip chip, can be realized by 485 buses between controller
Linkage.
Meanwhile the air exhausting device 100 in the present embodiment it can be seen from above content can control current exhaust air rate to be maintained at
Target exhaust air rate, or control work as front wind speed and are maintained at target face wind speed, avoid because exhaust air rate is too big, cause the energy unrestrained
Take, thus the problem of further solving energy waste.In addition to this, face wind speed is maintained at a constant value, also can avoid
Face wind speed is too big or too small gas is caused to flow out.
It should be noted that laboratory hood 10 further includes cabinet body, cabinet body is connected to exhaust duct 11, and air draft air-valve 12 can be located at
The junction of cabinet body and exhaust duct 11.Particularly, in Fig. 1, with the connection relationship of air draft air-valve 12 and exhaust duct 11, come
Indicate that air draft air-valve 12 is mounted on exhaust duct 11, but in practical applications, can flexible design air draft air-valve 12 installation position
Set, as air draft air-valve 12 also it is mountable on the cabinet, etc..
Participate in Fig. 2, it is preferable that air exhausting device 100 may include three kinds of operating modes, automatic mode, minimal mode and maximum
Mode, accordingly, air exhaust controller 13 include automatic mode control unit 131, minimal mode control unit 132 and max model
Control unit 133, automatic mode control unit 131, minimal mode control unit 132 and max model control unit 133 with
Air draft air-valve 12 connects.
Referring to Fig. 3, in automatic mode, automatic mode control unit 131 is used for according to when front wind speed and target face wind
Speed controls the open angle of air draft air-valve 12.
In automatic mode, using target face wind speed as reference value, control is maintained at target face wind speed when front wind speed.If working as
Front wind speed is greater than target face wind speed, then the open angle for controlling air draft air-valve 12 reduces, and can turn down air draft air-valve 12；If working as
Front wind speed is less than target face wind speed, then the open angle for controlling air draft air-valve 12 increases, and can open air draft air-valve 12 greatly；If working as
Front wind speed is equal to target face wind speed, i.e., when front, wind speed meets the requirement of target face wind speed, then controls beating for air draft air-valve 12
Angle of release degree is kept, and can stop the adjustment to air draft air-valve 12.Automatic mode can greatly reduce the demand of personnel, reduce energy consumption
Meanwhile reducing the investment of labor cost.
Goal face wind speed is the face wind speed that lab assistant inputs in advance, according to country to the face wind of laboratory hood 10
The standard requirements of fast 0.4m/s~0.6m/s can set 0.5m/s for target face wind speed.
Referring to Fig. 3, in minimal mode, minimal mode control unit 132 is used for according to current exhaust air rate and target air draft
Amount controls the open angle of air draft air-valve 12.
In minimal mode, using target exhaust air rate as reference value, control current emissions amount is maintained at target exhaust air rate.If working as
Preceding exhaust air rate is greater than target exhaust air rate, then the open angle for controlling air draft air-valve 12 reduces, and can turn down air draft air-valve 12；If working as
Preceding exhaust air rate is less than target exhaust air rate, then the open angle for controlling air draft air-valve 12 increases, and can open air draft air-valve 12 greatly；If working as
Preceding exhaust air rate is equal to target exhaust air rate, i.e., current exhaust air rate meets target exhaust air rate, then controls the open angle of air draft air-valve 12
It keeps, the adjustment to air draft air-valve 12 can be stopped.When laboratory does not have personnel, air draft mode can be set in minimal mode,
To guarantee air circulation appropriate, it is ensured that the Environmental security in laboratory.
Wherein, in minimal mode, target exhaust air rate is related with the cabinet door area of laboratory hood 10, and therefore, it is necessary to obtain first
It takes the door height of laboratory hood 10 to calculate cabinet door area, obtains target exhaust air rate further according to cabinet door area, thus rationally control row
The open angle of wind air-valve 12.
Referring to fig. 2, it is preferable that laboratory hood 10 further includes a high sensor 14, and the high sensor 14 of door is controlled with minimal mode
Unit 132 connects.The door that the high sensor 14 of door is used to monitor laboratory hood 10 is high, and minimal mode control unit 132 obtains Men Gaohou
Target exhaust air rate can be set.
Referring to Fig. 3, in max model, max model control unit 133, the open angle for controlling air draft air-valve is protected
It holds in maximum value.
In max model, control current emissions amount keeps maximum, and the open angle for directly controlling air draft air-valve 12 is kept
In maximum value, air draft air-valve 12 can be opened to the maximum.When the gas generated in laboratory is more, air draft mode can be set in
Max model, to guarantee the quick discharge of polluted gas etc., it is ensured that personnel safety.
Referring to fig. 4, further, laboratory hood 10 further includes face air velocity transducer 15, face air velocity transducer 15 and air draft control
Device 13 processed connects.
Face air velocity transducer 15 works as front wind speed for acquiring in real time, and air exhaust controller 13 works as front wind for obtaining in real time
Speed, and will be compared when front wind speed with target face wind speed, if turning down air draft wind when front wind speed is greater than target face wind speed
Valve 12；If opening big air draft air-valve 12 when front wind speed is less than target face wind speed；If when front wind speed is equal to target face wind speed,
Then stop changing air draft air-valve 12.Air exhaust controller 13 is also used to by obtaining when front airspeedometer calculates current exhaust air rate etc..
Preferably, the principle acquisition of thermal mass detection flows can be used when front wind speed in face air velocity transducer 15.
Further, laboratory hood 10 further includes human body sensor 16, and air exhaust controller 13 includes that target face wind speed is adjusted automatically
Whole unit 134, human body sensor 16 are connect with target face wind speed adjust automatically unit 134；Wherein, human body sensor 16 is for supervising
Whether survey has human body close；Target face wind speed adjust automatically unit 134 is used for the adjust automatically target face wind when there is human body close
Speed.
Referring to Fig. 3, for example, in automatic mode, when lab assistant is operated before 10 cabinet of laboratory hood, people is on the move
Meeting airflow influence, to lead to the collected face wind speed of face air velocity transducer 15 because airflow influence meeting opposite wind speed interferes
There is error with practical face wind speed, therefore when front wind speed is no longer satisfied requirement, it is likely that will cause the stream such as polluted gas
Out the phenomenon that, and human body sensor 16 is provided in the present embodiment on laboratory hood 10, human body sensor 16 is for monitoring air draft
Whether cabinet 10 has human body to approach, the target face wind when human body sensor 16 has monitored that human body is close, in air exhaust controller 13
Fast adjust automatically unit 134 will on the basis of the target face wind speed inputted originally adjust automatically, with eliminate human body interference because
Element.When being blocked because of human body, it will usually cause collected front wind speed of working as relatively low, therefore, the increase that is automatically regulated to be herein is adjusted
It is whole.
Wherein, target face wind speed adjust automatically unit 134 is a part in air exhaust controller 13, can be circuit, or
Person's chip etc., human body sensor 16 are realized with target face wind speed certainly by the connection with target face wind speed adjust automatically unit 134
The association of dynamic adjustment unit 134, further realize it is associated with air exhaust controller 13, so that human body sensor 16 can be filled with air draft
Setting 100 automatic mode is associated.
Preferably, the adjusted value of target face wind speed adjust automatically unit 134 is+0.2m/s.
Based on human body the annoyance level caused by the wind speed of front, target face wind speed can be increased 0.2m/s.
In more preferred embodiments, the adjusted value of also settable target face wind speed adjust automatically unit 134 is other values,
Depending on specifically can be according to actual conditions.
Participate in Fig. 4, it is preferable that laboratory hood 10 further includes Temperature Humidity Sensor 17, and air exhaust controller 13 includes alarm unit
135, Temperature Humidity Sensor 17 is connect with alarm unit 135.
It further include Temperature Humidity Sensor 17 in laboratory hood 10, Temperature Humidity Sensor 17 is for real-time to improve safety
Monitor the current temperature and humidity in laboratory hood 10；Alarm unit 135 compares current temperature and humidity and temperature for obtaining current temperature and humidity
Humidity threshold issues warning note, to provide a kind of security monitoring measure when current temperature and humidity is greater than Threshold of Temperature And Humidity.
Wherein, Threshold of Temperature And Humidity is highest temperature and humidity of the laboratory hood 10 under security situation.
If the temperature and humidity in laboratory hood 10 is higher, the capable of emitting warning note of alarm unit 135, to improve laboratory
Safety guarantees personnel safety；It does not need personnel simultaneously to monitor at any time yet, realizes automatic alarm, it is ensured that unattended height
Imitate work.
Further, laboratory hood 10 further includes touch display screen, touch display screen respectively with air exhaust controller 13 and air-supply
Controller 23 connects.
Touch display screen includes operation panel, for lab assistant input operation control.Such as: being equipped on operation panel
The on & off switch of air exhaust controller 13 and the on & off switch of air blowing control device 23, lab assistant can control two controls on operation panel
Device opening of device processed, further to complete the linkage work of air draft and air-supply.
Touch display screen further includes display panel, for showing the running parameter etc. of laboratory hood 10.Such as: Temperature Humidity Sensor
17 temperature and humidity values real-time monitored can be displayed in touch display screen, and lab assistant can be intuitive to see in laboratory hood 10
Temperature and humidity.
It further, include air supply pattern selection key and air draft mode selecting key in touch display screen.
Referring to Fig. 3, lab assistant can carry out model selection in touch display screen.When lab assistant selects air draft mould
When formula, air draft setting parameter, such as laboratory hood number, target face wind speed and cabinet door width parameter can be inputted, air draft mode is started
Start, air exhausting device 100 starts discharge and tests indoor polluted gas etc..After the starting of air draft mode, it is defaulted as automatic mode, also
Minimal mode and max model can be selected according to the actual situation.
When lab assistant selects air supply pattern, air-supply setting parameter can be inputted, such as laboratory hood quantity, air-supply open area
Etc. parameters, starting air supply pattern start, air supply device 200 starts toward laboratory in feeding air quantity, in the work of air supply device 200
In, the air draft total amount based on reading is compared with current air output, if current air output is greater than air draft total amount, control is sent
The open angle of wind air-valve 22 reduces, and can turn down air-supply air-valve；If current air output is less than air draft total amount, air-supply air-valve is controlled
22 open angle increases, and can open big air-supply air-valve and be conducive to so that air draft total amount and current air output reach dynamic equilibrium
Test the discharge of indoor polluted gas etc..
Preferably, 3.5 cun of touch display screens can be selected in touch display screen.
It should be noted that air draft display area and air-supply display area can be respectively displayed on different display interfaces, when
When selecting air draft mode, the corresponding display interface of touch display screen is air draft display screen, when selecting air supply pattern, touches display
Shield corresponding display interface for air-supply display screen.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
Although the preferred embodiment of the utility model embodiment has been described, those skilled in the art are once learnt
Basic creative concept, then additional changes and modifications can be made to these embodiments.So appended claims are intended to solve
It is interpreted as including preferred embodiment and all change and modification for falling into the utility model embodiment range.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements not only wrap
Those elements are included, but also including other elements that are not explicitly listed, or further includes for this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in process, method, article or the terminal device for including the element.
Above to a kind of exhaust control system provided by the utility model, it is described in detail, it is used herein
Specific case is expounded the principles of the present invention and embodiment, and the explanation of above example is only intended to help to manage
Solve the method and its core concept of the utility model；At the same time, for those skilled in the art, according to the utility model
Thought, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as
Limitations of the present invention.
Claims (9)
1. a kind of exhaust control system, which is characterized in that including air exhausting device and air supply device；Wherein,
The air exhausting device includes several laboratory hoods, and the laboratory hood includes exhaust duct, air draft air-valve and air exhaust controller, institute
It states air draft air-valve to be mounted on the exhaust duct, the air exhaust controller is mounted on the air draft air-valve, the air draft control
Device processed is connect with the air draft air-valve；
The air supply device includes that air supply duct, air-supply air-valve and air blowing control device, the air-supply air-valve are mounted on the air-supply
On pipeline, the air blowing control device is mounted on the air-supply air-valve, and the air blowing control device is connect with the air-supply air-valve；
Several described air exhaust controllers are connect with the air blowing control device；
The air exhaust controller works as front wind speed and current exhaust air rate for obtaining, and according to target face wind speed or target air draft
Amount, the current exhaust air rate that controls the open angle of the air draft air-valve, while will acquire are sent to the air blowing control device；
The air blowing control device calculates the air draft total amount of the air exhausting device for reading the current exhaust air rate, obtains simultaneously
Current air output is taken, according to the current air output and the air draft total amount, controls the open angle of the air-supply air-valve.
2. exhaust control system according to claim 1, which is characterized in that the air exhaust controller includes:
Automatic mode control unit controls the air draft air-valve for working as front wind speed and the target face wind speed according to described
Open angle；
Minimal mode control unit, for controlling the air draft air-valve according to the current exhaust air rate and the target exhaust air rate
Open angle；
Max model control unit, the open angle for controlling the air draft air-valve are maintained at maximum value.
3. exhaust control system according to claim 2, which is characterized in that the laboratory hood further includes a high sensor,
The high sensor of door is connect with the minimal mode control unit.
4. exhaust control system according to claim 1, which is characterized in that the laboratory hood further includes face wind speed sensing
Device, the face air velocity transducer are connect with the air exhaust controller.
5. exhaust control system according to claim 1, which is characterized in that the laboratory hood further includes human body sensor,
The air exhaust controller includes target face wind speed adjust automatically unit, and the human body sensor is adjusted automatically with the target face wind speed
Whole unit connection；Wherein,
The human body sensor is for having monitored whether that human body is close；
The target face wind speed adjust automatically unit is used for the target face wind speed described in adjust automatically when there is human body close.
6. exhaust control system according to claim 5, which is characterized in that the target face wind speed adjust automatically unit
Adjusted value is+0.2m/s.
7. exhaust control system according to claim 1, which is characterized in that the laboratory hood further includes temperature and humidity sensing
Device, the air exhaust controller include alarm unit, and the Temperature Humidity Sensor is connect with the alarm unit.
8. described in any item exhaust control systems according to claim 1~7, which is characterized in that the laboratory hood further includes touching
Display screen is touched, the touch display screen is connect with the air exhaust controller and the air blowing control device respectively.
9. exhaust control system according to claim 8, which is characterized in that include air supply pattern in the touch display screen
Selection key and air draft mode selecting key.
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| CN201820791200.7U CN208704093U (en) | 2018-05-25 | 2018-05-25 | A kind of exhaust control system |
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| CN201820791200.7U CN208704093U (en) | 2018-05-25 | 2018-05-25 | A kind of exhaust control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613319A (en) * | 2018-05-25 | 2018-10-02 | 北京普莱德斯工程技术有限责任公司 | A kind of exhaust control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613319A (en) * | 2018-05-25 | 2018-10-02 | 北京普莱德斯工程技术有限责任公司 | A kind of exhaust control system |
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Effective date of registration: 20230914 Address after: Room 31614, Building 1, Building 1, Jinqiao International Plaza, No. 50 Keji Road, High tech Zone, Xi'an City, Shaanxi Province, 710016 Patentee after: Shaanxi Dodo Construction Engineering Co.,Ltd. Address before: 100079 room 709, building 1, 21 shunsantiao, Songzhuang Road, Fengtai District, Beijing Patentee before: BEIJING PLADS ENGINEERING TECHNOLOGY Co.,Ltd. |