CN114321738A - Pipeline early warning system - Google Patents
Pipeline early warning system Download PDFInfo
- Publication number
- CN114321738A CN114321738A CN202011281846.9A CN202011281846A CN114321738A CN 114321738 A CN114321738 A CN 114321738A CN 202011281846 A CN202011281846 A CN 202011281846A CN 114321738 A CN114321738 A CN 114321738A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- early warning
- signal processing
- film capacitor
- processing module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The application relates to a pipeline early warning system, which comprises an alternating current power supply circuit, a control circuit and a control circuit, wherein the alternating current power supply circuit is used for supplying alternating current; a thin film capacitor connected to the AC power supply circuit; the signal processing module is used for acquiring electric signal data in the thin film capacitor and generating an early warning signal according to the change of the electric signal data; the signal processing module is also used for transmitting the early warning signal to the control terminal; the control terminal is used for alarming after acquiring the early warning signal; the film capacitor is provided with a plurality of, and a plurality of film capacitor are connected with the pipeline along the pipeline periphery in proper order. The integrity of the film capacitor is detected through electrical signal data, and the film capacitor is stable and accurate. The method and the device have the effects of low false alarm rate and high early warning precision.
Description
Technical Field
The application relates to the field of early warning, in particular to a pipeline early warning system.
Background
Pipelines are currently the most common type of transportation equipment used to transport resources over long distances. The west-east transportation engineering for transporting natural gas is the most representative. Secondly, the transportation of resources such as product oil, petroleum and water is mainly based on the erection of pipelines. And the pipeline spanning dozens of kilometers and even hundreds of kilometers is not easy to realize manual supervision. Pipeline early warning systems are developed to protect pipelines and resources in the pipelines.
Early warning system among the correlation technique mostly monitors the pipeline through detector instruments such as pressure sensor, temperature sensor and optic fibre vibrations sensing. When the monitored index is abnormal, the detection instrument transmits a signal to a controller connected with the detection instrument, and the controller analyzes the obtained index change rule to judge whether the pipeline has a problem or not so as to control the alarm to give an alarm or not. And the related responsible personnel check and protect the pipeline through the alarm state of the alarm.
In view of the above-mentioned related technologies, the inventor believes that the pressure sensor, the temperature sensor, the light vibration sensor, and the like monitor the pipeline through indirect signals, and do not directly monitor whether the pipeline itself is damaged. And the pipeline is usually buried underground or erected outdoors, and the environment condition is more complicated. The probability that the external environment triggers the detection instrument to transmit the alarm signal is high, so that the false alarm rate is increased, and the early warning precision of the early warning system is reduced.
Disclosure of Invention
In order to reduce the false alarm rate and further improve the early warning precision, the application provides a pipeline early warning system.
The application provides a pipeline early warning system adopts following technical scheme:
a pipeline early warning system comprises an alternating current power supply circuit, a pipeline early warning circuit and a pipeline early warning circuit, wherein the alternating current power supply circuit is used for supplying alternating current;
the direct current power supply circuit is used for providing direct current;
a thin film capacitor connected to the ac power supply circuit;
the system comprises a signal processing module and a control terminal; the signal processing module is connected with the direct-current power supply circuit and used for acquiring electric signal data in the thin film capacitor and generating an early warning signal according to the change of the electric signal data; the signal processing module is also used for transmitting an early warning signal to the control terminal;
and the control terminal is used for alarming after acquiring the early warning signal.
By adopting the technical scheme, the thin film capacitor is coated on the outer wall of the pipeline, and when the pipeline is damaged destructively, such as drilling, breaking or local damage. The thin film capacitor is damaged, and the electric signal data in an alternating current circuit where the thin film capacitor is located can generate sudden change. The signal processing module generates an early warning signal to the control terminal based on the sudden change of the electric signal data, and the control terminal gives an alarm to remind workers. Compared with detection modes such as a pressure sensor or a light vibration sensor in the related technology, on one hand, the scheme can fully cover the outer peripheral side of the pipeline, and comprehensive protection is realized; on the other hand, the alarm is started when the pipeline per se encounters abnormity, so that the false alarm rate is reduced, and the early warning precision is improved.
Optionally, the film capacitor includes two conductive layers stacked and used for forming two electrode plates of the capacitor, and an insulating layer is disposed between the two conductive layers.
Through adopting above-mentioned technical scheme, conducting layer and insulating layer constitute the capacitor structure, compare in detection instrument such as sensor. The pipeline early warning detection is realized through the change of the electric signal data, and the stability is higher. The conducting layer is not easy to damage under the natural environment, the false alarm rate is reduced, and the early warning precision is improved.
Optionally, a protective layer for covering the conductive layer is disposed on one side of the conductive layer away from the insulating layer.
By adopting the technical scheme, the protective layer covers the conductive layer and the insulating layer, so that objects in the external environment are not easy to contact with the conductive layer and the insulating layer, and the conductive layer or the insulating layer is not easy to damage. The stability of the film capacitor is improved, the false alarm rate is reduced, and the early warning precision is improved.
Optionally, the conductive layer is formed by laying conductive strips, the width of each conductive strip is set to be 0.5-5 cm, and the thickness of each conductive layer is set to be 0.1-1 cm.
Through adopting above-mentioned technical scheme, centimetre level bandwidth helps improving the destruction precision of conducting band. That is, when the conductive band is damaged less than the bandwidth width, the electric signal data acquired by the signal processing module is not enough to exceed the signal threshold, so that the early warning is not easily triggered. The early warning precision is selective, and the false alarm rate is reduced. The thickness setting of conducting layer is between 0.1 micron ~ 1 centimetre, helps improving the flexibility of conducting layer, and the thin film capacitor of being convenient for fully wraps the periphery side at the pipeline, carries out the early warning protection to the pipeline, has improved the early warning precision.
Optionally, a plurality of film capacitors are arranged, and the film capacitors are sequentially laid along the periphery of the pipeline; and the adjacent film capacitors are mutually contacted and fixedly connected with the pipeline.
By adopting the technical scheme, when the length of the pipeline is longer, the pipeline is coated by a plurality of film capacitors. Adjacent film capacitors are in contact with each other. Make other people be difficult for destroying the pipeline through the gap between the adjacent film capacitor, cause the detection leak, help improving the early warning precision, carry out better early warning protection to the pipeline.
Optionally, a plurality of film capacitors are arranged, and the film capacitors are sequentially laid along the periphery of the pipeline; an overlapping section is formed between adjacent film capacitors.
Through adopting above-mentioned technical scheme, when other people destroy the pipeline, if destroy the overlap section that the position is located adjacent film capacitor. The control terminal will receive both early warning signals simultaneously. At the moment, the related responsible personnel can know that the damage position is positioned in the overlapping section, and the positioning precision is improved.
Optionally, one signal processing module is provided, and each thin film capacitor is connected to the signal processing module.
Through adopting above-mentioned technical scheme, a plurality of film capacitor are connected with a signal processing module, help reduce cost, reduce the construction degree of difficulty. Therefore, the installation precision is ensured, the false alarm rate is reduced, and the early warning precision is improved.
Optionally, a difference module is arranged in the signal processing module; the difference module is used for carrying out difference numbering on the electric signal data in the film capacitors; and the difference module is also used for numbering the early warning signals according to the numbers of the electric signal data corresponding to the early warning signals when the signal processing module generates the early warning signals.
By adopting the technical scheme, the cost and the construction difficulty are further reduced, the installation precision is ensured, the false alarm rate is reduced, and the early warning precision is improved.
Optionally, the number of the signal processing modules is multiple, and the multiple signal processing modules are in one-to-one correspondence communication connection with the thin film capacitors.
Through adopting above-mentioned technical scheme, every film capacitor all corresponds and sets up a signal processing module, helps improving the stability that the signal of telecommunication data acquireed and transmitted. Therefore, the false alarm rate is reduced, and the early warning precision is improved.
Optionally, the film capacitor is connected to a positioning module, and the positioning module is configured to generate position data and transmit the position data to the control terminal.
By adopting the technical scheme, the positioning module is convenient for relevant responsible personnel to know the position of the damaged thin film capacitor. Therefore, the device can arrive at the site in time and protect the pipeline.
Drawings
Fig. 1 is a circuit connection diagram of a pipeline early warning system in embodiment 1 of the present application;
FIG. 2 is a schematic view of a connection structure between a pipe and a film capacitor in example 1 of the present application;
fig. 3 is a sectional view of a film capacitor in embodiment 1 of the present application;
fig. 4 is a schematic view of the overall structure of the film capacitor in embodiment 1 of the present application;
fig. 5 is a block diagram of a signal processing module in embodiment 1 of the present application;
FIG. 6 is a side view showing the connection of a pipe and a film capacitor according to example 2 of the present application;
fig. 7 is a circuit connection diagram of a pipeline warning system in embodiment 3 of the present application;
fig. 8 is a schematic diagram of a related structure of a signal processing module.
Description of reference numerals: 1. an alternating current power supply circuit; 2. a thin film capacitor; 21. a conductive layer; 22. an insulating layer; 23. a protective layer; 24. a connection terminal; 3. a signal processing module; 31. a difference module; 4. a control terminal; 5. a positioning module; 6. a pipeline; 7. a DC power supply circuit.
Detailed Description
The embodiment of the application discloses a pipeline early warning system.
Example 1
Referring to fig. 1, the pipeline early warning system includes an ac power circuit 1, a dc power circuit 7, a film capacitor 2, a signal processing module 3, and a control terminal 4. The ac power supply circuit 1 supplies ac power to the film capacitor 2, and generates electric signal data in the film capacitor 2. The direct current power supply circuit 7 is used for providing direct current, and the signal processing module 3 is connected with the direct current power supply circuit 7. The signal processing module 3 acquires the electrical signal data in the film capacitor 2, generates an early warning signal according to the change of the electrical signal data, and transmits the early warning signal to the control terminal 4. And the control terminal 4 is used for giving an alarm after receiving the early warning signal. The relevant responsible personnel can know the early warning information in time conveniently.
Referring to fig. 2, one or more film capacitors 2 may be provided. The film capacitor 2 is connected to the pipe 6 along the outer periphery of the pipe. Specifically, when the film capacitor 2 is provided in plurality, the plurality of film capacitors 2 are sequentially wrapped on the pipeline along the periphery of the pipeline. The adjacent film capacitors 2 are in contact with each other. The film capacitors 2 are fixedly connected with the pipeline 6, and the fixed connection mode is determined by specific construction, such as gluing or welding.
Referring to fig. 1 and 3, the film capacitor 2 includes two conductive layers 21 stacked to constitute two capacitor plates, and an insulating layer 22 is interposed between the two conductive layers 21. The insulating layer 22 and the two conductive layers 21 constitute a capacitor structure. Each conductive layer 21 is connected with a connection terminal 24, and the connection terminal 24 is used for connecting the ac power supply circuit 1 and the conductive layer 21 connected thereto. An ac circuit is formed between ac power supply circuit 1, connection terminal 24, and conductive layer 21, and electric signal data is formed in conductive layer 21. The insulating layer 22 may be made of rubber or plastic.
Referring to fig. 4, the thickness of the conductive layer 21 is set between 0.1 μm and 1 cm, and the conductive layer 21 is formed by at least one conductive tape. In particular, the conductive strips are provided as strips of material having conductive properties, such as aluminum strips, copper strips, graphite or conductive carbon black. The conductive strips are laid back and forth in a zigzag pattern from one side of the insulating layer 22 to the other side with gaps formed therebetween. The gap allows alternating current to flow through any one of the conductive layers 21. For another example, when a direct current is applied to the conductive tape, the gaps allow the direct current in the conductive tape to flow in the direction in which the conductive tape is laid. The width of the conductive band is set between 0.5 cm and 5 cm, which is helpful for relevant responsible personnel to set a threshold value, thereby reducing the false alarm rate.
Referring to fig. 3, a side of the conductive layer 21 away from the insulating layer 22 is provided with a protective layer 23, and the protective layer 23 is made of an insulating material, such as a rubber film or a plastic film. The interlayer bonding between the conductive layer 21 and the insulating layer 22 and between the conductive layer 21 and the protective layer 23 may be specifically determined according to a manufacturing process of the thin film capacitor, such as plating, etching, or bonding by a polymer adhesive. The protective layer 23 is used to cover the conductive layer 21 and the insulating layer 22, so that an external object is not easily in direct contact with the conductive layer 21 or the insulating layer 22, and the conductive layer 21 and the insulating layer 22 are not easily scratched. The stability of the electric signal data is improved, the false alarm rate is reduced, and the early warning precision is improved. In addition, the protective layer 23 may be provided as an anticorrosive film to make the conductive layer 21 and the insulating layer 22 less susceptible to corrosion. Lines such as power supply lines and signal transmission lines are arranged between the protective layer 23 and the conductive layer 21, which are close to one side of the outer peripheral surface of the pipeline, so that line protection is realized, and lines such as power supply lines of the pipeline early warning system are not easy to be damaged by others.
Referring to fig. 1, a plurality of signal processing modules 3 are provided, and the plurality of signal processing modules 3 are connected to the film capacitors 2 in a one-to-one correspondence manner. That is, one signal processing module 3 is provided in each film capacitor 2, and the input terminal of the signal processing module 3 is connected to the connection terminal 24 in the corresponding film capacitor 2, thereby acquiring the electrical signal data in the conductive layer 21. The electrical signal data may be a voltage signal, a current signal, or a resistance signal.
Referring to fig. 1 and 5, taking a voltage signal as an example, a voltage average value in a normal state is taken as a reference signal. The voltage signal in the film capacitor 2 is collected and the average value thereof is calculated, and the voltage average value is compared with the voltage reference signal. When the film capacitor 2 is damaged, such as puncture, tearing and corrosion, the conductive belt is broken, the difference value between the conductive belt and the thin film capacitor is larger than the signal threshold value, a high level signal is output, and the control terminal receives the high level signal and then gives an alarm or drives an alarm connected with the control terminal to give an alarm.
For another example, by collecting the current signal in the film capacitor 2, when the film capacitor 2 is damaged, the resistance value of the film capacitor 2 increases, the current value in the ac circuit decreases, and even the film capacitor 2 makes the ac circuit in an open circuit state, the current value is zero. At this time, when the acquired current signal exceeds the threshold range, the signal processing module 3 outputs a high level signal to prompt the control terminal to alarm. The signal processing module 3 can be an MCU or a singlechip. The signal processing module 3 may compare the electrical signal data with a threshold value by using a comparison circuit or a program capable of implementing a comparison function, and output a low level signal or a high level signal. The low level signal is considered normal, and the high level signal is an alarm signal.
Referring to fig. 1, a rectifying circuit and a switching unit are disposed in the signal processing module 3, an input end of the rectifying circuit is connected to the ac power supply circuit 1, and the switching unit is connected between an output end of the rectifying circuit and a power supply end of the signal processing module 3. The switching unit is connected with the direct-current power circuit 7, and when the alternating-current circuit is in an open circuit state, the switching unit conducts the direct-current power supply and the power supply end of the signal processing module 3, so that the stable work of the signal processing module 3 is ensured.
Referring to fig. 1 and 2, the film capacitor 2 is connected with a positioning module 5, and specifically, the positioning module 5 is embedded between the protective layer 23 and the conductive layer 21. The positioning module 5 can be a Beidou chip or a GPS chip and is used for generating position data and transmitting the position data to the control terminal 4 in real time. When the control terminal 4 receives the early warning signal, the related responsible personnel know the position of the damaged film capacitor 2 through the corresponding position data, so that the pipeline 6 is protected on site in time. The control terminal 4 may be a PLC control system or a PC terminal.
As a variation of this embodiment, the positioning module 5 is integrated in the signal processing module 3, connected to the control terminal 4, and transmits the position data to the control terminal 4 in real time.
When the film capacitor 2 is laid, the positioning module 5 and the signal processing module 3 are disposed on the side close to the outer peripheral surface of the pipe 6. When the thin film capacitor 2 is damaged by another person, the conductive layer 21 is damaged preferentially, but not the positioning module 5 or the signal processing module 3. In addition, because the circuit, the positioning module 5 and the signal processing module 3 in the system are all positioned between the protective layer 23 and the conductive layer 21 and are positioned at one side close to the outer peripheral surface of the pipeline 6, the circuit, the signal processing module 3 and the positioning module 5 of the system are not easy to be damaged by others under the condition of not damaging the conductive layer 21.
The implementation principle of the embodiment 1 is as follows: the alternating current power circuit 1, the film capacitor 2 and the signal processing module 3 form an alternating current circuit, and the signal processing module 3 acquires electrical signal data in the film capacitor 2. When the thin film capacitor 2 is damaged, the conductive layer 21 is broken, so that the electrical signal data is abruptly changed. The signal processing module 3 generates a corresponding early warning signal and transmits the early warning signal to the control terminal 4. And the control terminal 4 gives an alarm after receiving the early warning signal or controls an alarm connected with the control terminal to give an alarm. After the related responsible personnel hear the warning, through looking over corresponding position data, learn the position that the film capacitor 2 that damages is located, then arrive the scene, protect the pipeline. Because the acquisition and transmission of the electric signal data are stable and are not easily interfered by the external environment, the false alarm rate of the early warning system is favorably reduced. In addition, a plurality of film capacitor 2 fully wraps on the outer peripheral face of pipeline, helps improving the early warning precision, carries out abundant early warning protection to the pipeline.
Example 2
Referring to fig. 6, the present embodiment is different from embodiment 1 in that a plurality of film capacitors 2 are provided, and an overlapping section is formed between adjacent film capacitors 2. The overlapped section is the overlapped part of the adjacent film capacitors 2, such as Δ 1 and Δ 2 in the figure. When other people destroy the overlapping section, the control terminal 4 receives two early warning signals simultaneously, so that the related responsible person can more accurately determine the destroyed position of the film capacitor 2, and the early warning precision is improved.
Example 3
Referring to fig. 7 and 8, the present embodiment is different from embodiment 1 in that one signal processing module 3 is provided, and the signal processing module 3 is connected to a plurality of film capacitors 2 for acquiring electrical signal data generated by each film capacitor 2. The signal processing module 3 is provided with a difference module 31, and the difference module 31 is used for performing differential numbering on the electrical signal data in the plurality of film capacitors 2. The differential numbers, that is, the numbers of the electric signal data in each film capacitor 2 are different from each other. The difference module 31 is further configured to number the early warning signal according to the number of the electrical signal data corresponding to the early warning signal when the signal processing module 3 generates the early warning signal. And related responsible personnel check the number of the early warning signal through the control terminal 4, so that the position of the damaged film capacitor 2 is known.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A pipeline early warning system, its characterized in that: comprises an alternating current power supply circuit (1) for supplying alternating current;
a DC power supply circuit (7) for supplying DC power;
a thin film capacitor (2) connected to the AC power supply circuit (1);
the device comprises a signal processing module (3) and a control terminal (4); the signal processing module (3) is connected with the direct-current power supply circuit (7) and is used for acquiring electrical signal data in the film capacitor (2) and generating an early warning signal according to the change of the electrical signal data; the signal processing module (3) is also used for transmitting an early warning signal to the control terminal (4);
and the control terminal (4) is used for alarming after acquiring the early warning signal.
2. The pipeline warning system of claim 1, wherein: the film capacitor (2) comprises two conducting layers (21) which are stacked and used for forming two electrode plates of the capacitor, and an insulating layer (22) is arranged between the two conducting layers (21).
3. The pipeline warning system of claim 2, wherein: and a protective layer (23) used for covering the conductive layer (21) is arranged on one side of the conductive layer (21) far away from the insulating layer (22).
4. The pipeline warning system of claim 2, wherein: the conducting layer (21) is formed by laying conducting strips, the width of each conducting strip is set to be 0.5-5 cm, and the thickness of the conducting layer (21) is set to be 0.1-1 cm.
5. The pipeline warning system of claim 1, wherein: the film capacitors (2) are arranged in a plurality, and the film capacitors (2) are sequentially laid along the periphery of the pipeline; the adjacent film capacitors (2) are in mutual contact, and the film capacitors (2) are fixedly connected with the pipeline.
6. The pipeline warning system of claim 1, wherein: the film capacitors (2) are arranged in a plurality, and the film capacitors (2) are sequentially laid along the periphery of the pipeline; an overlapping section is formed between the adjacent film capacitors (2).
7. The pipeline warning system of claim 1, wherein: the number of the signal processing modules (3) is one, and each film capacitor (2) is connected with the signal processing module (3).
8. The pipeline warning system of claim 1, wherein: a difference module (31) is arranged in the signal processing module (3); the difference module (31) is used for carrying out difference numbering on the electric signal data in the film capacitors (2); the difference module (31) is also used for numbering the early warning signals according to the numbers of the electric signal data corresponding to the early warning signals when the signal processing module (3) generates the early warning signals.
9. The pipeline warning system of claim 1, wherein: the signal processing modules (3) are arranged in a plurality, and the signal processing modules (3) are in one-to-one correspondence communication connection with the film capacitors (2).
10. The pipeline warning system of claim 9, wherein: the film capacitor (2) is connected with a positioning module (5), and the positioning module (5) is used for generating position data and transmitting the position data to the control terminal (4).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011079820 | 2020-10-10 | ||
| CN2020110798206 | 2020-10-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114321738A true CN114321738A (en) | 2022-04-12 |
Family
ID=81031878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011281846.9A Pending CN114321738A (en) | 2020-10-10 | 2020-11-16 | Pipeline early warning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114321738A (en) |
-
2020
- 2020-11-16 CN CN202011281846.9A patent/CN114321738A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10429267B2 (en) | Pipe assembly | |
| US8971673B2 (en) | Sensor tape for security detection and method of fabrication | |
| CN213513226U (en) | Pipeline early warning system | |
| WO2010041806A1 (en) | Pipeline monitoring system and method | |
| WO2014195756A1 (en) | Sensor tape for security detection and method of fabrication | |
| CN103927834A (en) | Underground pipeline perimeter intrusion early warning system | |
| US8653971B2 (en) | Sensor tape for security detection and method of fabrication | |
| CN103697334A (en) | Sleeve type automatic early warning system for underground buried object | |
| CN209638791U (en) | A kind of submarine pipeline leakage monitoring system | |
| WO2011021882A2 (en) | Leaking-fluid and pipe-cut sensing device, a production method for the same and a pipe employing the same | |
| CN114321738A (en) | Pipeline early warning system | |
| CN105974244B (en) | A kind of operation cable grounding condition detection method divided using frequency conversion resonance vibration | |
| CN205388231U (en) | Wireless power supply formula pipeline stress monitored control system | |
| CN108766641B (en) | A kind of deep-sea watertight cable | |
| JP2009531826A (en) | Power cable that can be searched for faults | |
| CA2845350C (en) | Cable assembly for providing power through inductive coupling | |
| WO2022075928A1 (en) | Intelligent link box with early warning system for online monitoring of sheath bonding system and high voltage cable accessories | |
| CN111863332A (en) | Intelligent loss measuring cable | |
| RU66834U1 (en) | MASKABLE SECURITY SYSTEM FOR UNDERGROUND PIPELINES FROM AN UNAUTHORIZED PIPE | |
| CN212871254U (en) | Flexible film electronic component | |
| JPH0340280B2 (en) | ||
| CN217879580U (en) | External-damage-prevention alarm system for underground pipeline | |
| CN214700314U (en) | Pipeline oil leakage early warning system | |
| CN210182122U (en) | Uninterrupted monitoring cable | |
| CN209880237U (en) | Intelligent loss measuring cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: Room 230, building 4, science and Technology Creative Park, Yuelu street, Yuelushan University Science and Technology City, Changsha City, Hunan Province, 410005 Applicant after: Changsha Jixia Technology Consulting Co.,Ltd. Address before: Room 230, building 4, science and Technology Creative Park, Yuelu street, Yuelushan University Science and Technology City, Changsha City, Hunan Province, 410005 Applicant before: Changsha Jixia Consulting Co.,Ltd. |