CN115355454A - Building pressure regulating station pressure detection device and detection method thereof - Google Patents
Building pressure regulating station pressure detection device and detection method thereof Download PDFInfo
- Publication number
- CN115355454A CN115355454A CN202211005613.5A CN202211005613A CN115355454A CN 115355454 A CN115355454 A CN 115355454A CN 202211005613 A CN202211005613 A CN 202211005613A CN 115355454 A CN115355454 A CN 115355454A
- Authority
- CN
- China
- Prior art keywords
- pressure
- valve
- monitoring terminal
- building
- regulating station
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to a pressure detection device of a building pressure regulating station, which comprises a monitoring terminal and a cloud platform, wherein the monitoring terminal is connected with the cloud platform; the monitoring terminal comprises an intelligent ball valve, a valve control motor and a controller; the valve control motor is assembled on the intelligent ball valve, and the controller is installed on the valve control motor; the intelligent ball valve is connected with a downstream pipe wall, and a pressure probe insertion point position and a temperature probe insertion point position are installed on the downstream pipe wall; the invention has simple structure, can monitor the pressure and temperature fluctuation of the low-pressure pipeline in real time and upload the data to the cloud system. The terminal can report an emergency and ask for help or increased vigilance in real time when finding unusual end to can long-rangely carry out and close the valve operation, when involving safety inspection, can carry out pressurize test operation, whether to reveal in order to confirm by the check pressure change condition with certain time interval after closing the valve, effectively ensure gas user's gas safety.
Description
Technical Field
The invention belongs to the technical field of gas pipe network monitoring, and particularly relates to a pressure detection device and a pressure detection method for a building pressure regulating station.
Background
With the steady progress of urbanization in China, the number of newly-built residential districts is more and more, the mileage of a gas pipe network is continuously increased, and the number of building pressure regulating boxes arranged by a gas company is gradually increased. In city gas pipe network system, the gas pipeline uses a period of back, and the condition of leaking can appear in inevitable, nevertheless because gas pipeline is in large quantity, the staff can't learn the leakage department of gas pipeline fast in real time after appearing leaking, and can't learn the leakage degree of gas pipeline fast.
In view of the above-mentioned technical problems, improvements are needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a pressure detection device and a pressure detection method for a building pressure regulating station, so that the functions of intellectualization of pipeline temperature and pressure monitoring, quick response to leakage and the like are realized.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a pressure detection device of a building pressure regulating station comprises a monitoring terminal and a cloud platform; the monitoring terminal comprises an intelligent ball valve, a valve control motor and a controller; the valve control motor is assembled on the intelligent ball valve, and the controller is installed on the valve control motor; the intelligent ball valve is connected with a downstream pipe wall, and a pressure probe insertion point and a temperature probe insertion point are arranged on the downstream pipe wall.
As a preferred scheme of the invention, the controller comprises a pressure probe, a temperature probe, a main control unit and a liquid crystal screen; the main control unit collects monitoring data of the pressure probe and the temperature probe, controls the valve control motor to carry out valve opening and closing operation on the intelligent ball valve, and meanwhile, periodically informs and stores the data to the cloud platform according to set time.
As a preferred scheme of the present invention, the liquid crystal display displays current pressure and temperature data, or presses a key switch interface on the controller to view current temperature and pressure, set a threshold, and historical data content of temperature and pressure.
As a preferred scheme of the invention, the pressure probe and the temperature probe are respectively inserted into a pressure probe insertion point and a temperature probe insertion point of the downstream pipe wall, the sensor is placed on the downstream pipe wall of the ball valve to effectively monitor the gas leakage condition of the user-side pipeline, and the high-sensitivity pressure probe is easier to find abnormal pressure fluctuation.
As a preferred scheme of the present invention, the cloud platform is connected to the real-time monitoring terminal through a mobile communication network; the cloud platform can check temperature and pressure historical data, pressure maintaining test results, pressure maintaining test pressure change curves and issue pressure maintaining test instruction functions.
A building pressure regulating station pressure detection method is based on a building pressure regulating station pressure detection device and comprises the following steps:
the method comprises the following steps: the monitoring terminal acquires pressure data every 15 seconds when the gas pipeline uses gas, and uploads the stored records to the cloud platform every certain time;
step two: if the monitoring terminal continuously monitors the abnormal pressure state exceeding the set threshold value for multiple times, the monitoring terminal actively reports the overrun alarm to the cloud platform;
step three: the administrator can issue a pressure maintaining test instruction after receiving the overrun alarm on the cloud platform;
step four: and the monitoring terminal closes the valve after receiving the instruction, records pressure data within a period of time after closing the valve, uploads the data to the system after pressure maintaining test is completed, and then opens the valve.
In a preferred embodiment of the present invention, in the third step, the pressure holding test command may be selected by an administrator according to the situation.
As a preferable scheme of the present invention, in the fourth step, if the pressure is not changed, the pressure is determined to be normal; if the pressure continuously drops, the leakage is judged to be abnormal, and the monitoring terminal closes the valve according to the situation.
As a preferred aspect of the present invention, the pressure monitoring device checks the result of the pressure holding test and the pressure variation curve during the pressure holding test on the cloud platform.
As a preferable aspect of the present invention, in the second step, the monitoring terminal determines the leakage amount according to the pressure abnormal state of the threshold value by the following method:
a. if the set threshold value 1 is more than or equal to the Pmaximum value, and the Pminimum value is more than the set threshold value 2, the leakage is judged to be slight;
b. if the set threshold value 2 is more than or equal to the Pmax value-Pmin value and is more than the set threshold value 3, judging that the leakage is small;
c. if the set threshold value 3 is larger than or equal to the Pmax value-Pmin value, the leakage is judged to be large.
The invention has the beneficial effects that:
1. the invention has simple structure, can monitor the pressure and temperature fluctuation of the low-pressure pipeline in real time and upload the data to the cloud system. The terminal can report an emergency and ask for help or increased vigilance in real time when finding unusual end to can long-rangely carry out and close the valve operation, when involving safety inspection, can carry out pressurize test operation, whether to reveal in order to confirm by the check pressure change condition with certain time interval after closing the valve, effectively ensure gas user's gas safety.
2. The courtyard pressure regulating station pressure and temperature monitoring system is ingenious in design, real-time monitoring of pressure and temperature of the courtyard pressure regulating station is achieved, and collected data are sent to the cloud platform in a timing mode to be recorded and analyzed.
3. The invention can monitor the variation trend of pressure and temperature in real time and discover the leakage of the gas pipeline as soon as possible.
4. The invention can execute the pressure maintaining test operation issued by the cloud system, accurately judge leakage and eliminate false alarm.
5. The terminal is provided with the intelligent ball valve and the controller, and can quickly close the valve when damage occurs, so that the safety is guaranteed to the maximum extent.
Drawings
Fig. 1 is a schematic structural view of a monitoring terminal of a pressure detecting device of a building pressure regulating station according to an embodiment of the invention.
Fig. 2 is a connection schematic diagram of a pressure detection device of a building pressure regulating station and a detection method thereof according to an embodiment of the invention.
Fig. 3 is a pressure maintaining test flow chart of a building pressure regulating station pressure detecting device and a detecting method thereof according to an embodiment of the invention.
Fig. 4 is a system framework diagram of a building pressure regulating station pressure detecting device and a detecting method thereof according to an embodiment of the invention.
Reference numbers in the figures: the intelligent ball valve comprises an intelligent ball valve 1, a valve control motor 2, a controller 3, a pressure probe insertion point 4, a temperature probe insertion point 5, a downstream pipe wall 6, a pressure probe 31, a temperature probe 32, a main control unit 33, a liquid crystal screen 34, a monitoring terminal 100 and a cloud platform 200.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.
Example (b):
as shown in the figure 1, the invention provides a structural schematic diagram of a building pressure regulating station pressure detection device, in order to improve the automation management level of a gas company and discover potential leakage hazards of a gas pipe network in time, the invention provides the building pressure regulating station pressure detection device for a low-pressure pipeline (less than or equal to 10 kPa) at the output end of a building pressure regulating box, and the pressure and temperature fluctuation of the low-pressure pipeline can be monitored in real time and data can be uploaded to a cloud system; the pressure monitoring device comprises a monitoring terminal 100 and a cloud platform 200; the monitoring terminal 100 comprises an intelligent ball valve 1, a valve control motor 2 and a controller 3; the valve control motor 2 is assembled on the intelligent ball valve 1, and the controller 3 is installed on the valve control motor 2; a downstream pipe wall 6 is connected to the intelligent ball valve 1, and a pressure probe insertion point 4 and a temperature probe insertion point 5 are mounted on the downstream pipe wall 6; the invention has simple structure, can monitor the pressure and temperature fluctuation of the low-pressure pipeline in real time and upload the data to the cloud system. The terminal can report an emergency and ask for help or increased vigilance in real time when finding unusual end to can long-rangely carry out and close the valve operation, when involving safety inspection, can carry out pressurize test operation, whether to reveal in order to confirm by the check pressure change condition with certain time interval after closing the valve, effectively ensure gas user's gas safety.
The controller 3 comprises a pressure probe 31, a temperature probe 32, a main control unit 33 and a liquid crystal screen 34; the main control unit 33 collects monitoring data of the pressure probe 31 and the temperature probe 32, controls the valve control motor 2 to perform valve opening and closing operations on the intelligent ball valve 1, and at the same time, periodically informs and stores the data to the cloud platform 200 according to set time; the monitoring terminal 100 in this embodiment is provided with the intelligent ball valve 1 and the controller 3, and can rapidly close the valve when damage occurs, so as to guarantee safety to the maximum extent.
The liquid crystal display 34 displays the current pressure and temperature data, or clicks the key switch interface on the controller 3 to view the current temperature and pressure, set the threshold value, and the historical data content of the temperature and pressure.
The pressure probe 31 and the temperature probe 32 are respectively inserted into the pressure probe insertion point 4 and the temperature probe insertion point 5 of the downstream pipe wall 6, the sensor is placed on the downstream pipe wall 6 of the ball valve to effectively monitor the gas leakage condition of a user-side pipeline, and the high-sensitivity pressure probe is easy to find abnormal pressure fluctuation; by adopting the technical scheme, the change trend of pressure and temperature can be monitored in real time, and the leakage of the gas pipeline can be found as soon as possible.
The cloud platform 200 is connected with the real-time monitoring terminal 100 through a mobile communication network; the cloud platform 200 can check temperature and pressure historical data, pressure maintaining test results, pressure maintaining test pressure change curves and issue pressure maintaining test instruction functions; by adopting the technical scheme, the pressure maintaining test operation issued by the cloud system can be executed, the leakage can be accurately judged, and the false alarm can be eliminated.
As shown in fig. 2, the connection diagram of the building pressure regulating station pressure detecting apparatus and the detecting method thereof in this embodiment is shown, in this embodiment, the monitoring terminal is arranged at the outlet end of the community courtyard pressure regulating box, so that the leakage abnormality of the gas pipe network can be found in time, the local operation can be performed by matching with the WeChat small program of the mobile phone, and the maintenance by field personnel is facilitated; the courtyard pressure regulating station pressure and temperature monitoring system is ingenious in design, the pressure and the temperature of the courtyard pressure regulating station can be monitored in real time, and the acquired data are sent to the cloud platform in a timing mode to be recorded and analyzed.
As shown in fig. 3, it is a pressure maintaining test flow chart of the pressure detecting device and the detecting method for the building pressure regulating station of the present invention; the method comprises the steps that an administrator can issue a pressure maintaining test instruction after the cloud platform receives an overrun alarm, the monitoring terminal closes the valve after receiving the instruction, pressure data within a period of time after the valve is closed are recorded, the data are uploaded to a system after pressure maintaining test is completed, and then the valve is opened.
FIG. 4 is a system framework diagram of a pressure detection device and method for a building pressure regulating station according to the embodiment of the present invention; specifically, the pressure detection method for the building pressure regulating station comprises the following steps:
the method comprises the following steps: the monitoring terminal 100 acquires pressure data every 15 seconds when gas is used by the gas pipeline, and uploads the stored records to the cloud platform 200 every certain time;
step two: if the monitoring terminal 100 continuously monitors the abnormal pressure state exceeding the set threshold for multiple times, the monitoring terminal actively reports the overrun alarm to the cloud platform 200;
step three: after receiving the overrun alarm, the administrator can issue a pressure maintaining test instruction;
step four: and the monitoring terminal 100 closes the valve after receiving the instruction, records pressure data within a period of time after closing the valve, uploads the data to the system after pressure maintaining test is completed, and opens the valve.
In step three, the administrator may select the execution time minute and the execution times according to the situation.
In the fourth step, if the pressure is not changed, the result of the pressure maintaining test is judged to be normal; if the pressure continuously drops, the leakage is judged to be abnormal, and the monitoring terminal closes the valve according to the situation.
The pressure monitoring device checks the pressure holding test result and the pressure change curve in the pressure holding test process on the cloud platform 200.
In step two, the monitoring terminal 100 determines the leakage amount according to the abnormal pressure state of the threshold value by the following method:
a. if the set threshold value 1 is more than or equal to the Pmaximum value, and the Pminimum value is more than the set threshold value 2, the leakage is judged to be slight;
b. if the set threshold value 2 is more than or equal to the Pmax value-Pmin value and is more than the set threshold value 3, judging that the leakage is small;
c. if the set threshold value 3 is larger than or equal to the Pmax value-Pmin value, the leakage is judged to be large.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more here: the intelligent ball valve 1, the valve-controlled motor 2, the controller 3, the pressure probe insertion point 4, the temperature probe insertion point 5, the downstream pipe wall 6, the pressure probe 31, the temperature probe 32, the main control unit 33, the liquid crystal screen 34, the monitoring terminal 100, the cloud platform 200 and other terms are used, but the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. The utility model provides a building pressure regulating station pressure measurement, its characterized in that: the pressure monitoring device comprises a monitoring terminal (100) and a cloud platform (200); the monitoring terminal (100) comprises an intelligent ball valve (1), a valve control motor (2) and a controller (3); the valve control motor (2) is assembled on the intelligent ball valve (1), and the controller (3) is installed on the valve control motor (2); a downstream pipe wall (6) is connected to the intelligent ball valve (1), and a pressure probe insertion point position (4) and a temperature probe insertion point position (5) are installed on the downstream pipe wall (6).
2. The pressure detection device of the building pressure regulating station as claimed in claim 1, wherein: the controller (3) comprises a pressure probe (31), a temperature probe (32), a main control unit (33) and a liquid crystal screen (34); the main control unit (33) collects monitoring data of the pressure probe (31) and the temperature probe (32), controls the valve control motor (2) to carry out valve opening and closing operation on the intelligent ball valve (1), and meanwhile, can periodically inform and store the data to the cloud platform (200) according to set time.
3. The pressure detection device of the building pressure regulating station as claimed in claim 1, wherein: the liquid crystal display (34) displays current pressure and temperature data, or clicks a key switching interface on the controller (3) to check current temperature and pressure, set a threshold value and historical data content of temperature and pressure.
4. The building pressure regulating station pressure detecting device of claim 1, wherein: the pressure probe (31) and the temperature probe (32) are respectively inserted into a pressure probe insertion point (4) and a temperature probe insertion point (5) of the downstream pipe wall (6), the sensor is placed on the downstream pipe wall (6) of the ball valve to effectively monitor the gas leakage condition of a user side pipeline, and the high-sensitivity pressure probe can easily find abnormal pressure fluctuation.
5. The pressure detection device of the building pressure regulating station as claimed in claim 1, wherein: the cloud platform (200) is connected with the real-time monitoring terminal (100) through a mobile communication network; the cloud platform (200) can check temperature and pressure historical data, pressure maintaining test results, pressure maintaining test pressure change curves and issue pressure maintaining test instruction functions.
6. A pressure detection method for a building pressure regulating station is characterized by comprising the following steps: the building pressure regulating station pressure detecting device based on any one of claims 1 to 5, comprising the following steps:
the method comprises the following steps: the monitoring terminal (100) collects pressure data every 15 seconds when gas is used by the gas pipeline, and uploads the stored records to the cloud platform (200) every certain time;
step two: if the monitoring terminal (100) continuously monitors the abnormal pressure state exceeding the set threshold value for multiple times, the monitoring terminal actively reports the overrun alarm to the cloud platform (200);
step three: the administrator can issue a pressure maintaining test instruction after the cloud platform (200) receives the overrun alarm;
step four: and the monitoring terminal (100) closes the valve after receiving the instruction, records pressure data within a period of time after closing the valve, uploads the data to the system after pressure maintaining test is finished, and opens the valve.
7. The method for detecting the pressure of the building pressure regulating station according to claim 6, wherein the method comprises the following steps: in the third step, the pressure maintaining test command can be selected by the administrator according to the situation, such as execution time (minutes) and execution times.
8. The method for detecting the pressure of the building pressure regulating station according to claim 6, wherein the method comprises the following steps: in the fourth step, if the pressure is not changed, the result of the pressure maintaining test is judged to be normal; if the pressure continuously drops, the leakage is judged to be abnormal, and the monitoring terminal closes the valve according to the situation.
9. The method for detecting the pressure of the building pressure regulating station according to claim 6, wherein the method comprises the following steps: the pressure monitoring device checks the pressure holding test result and the pressure change curve in the pressure holding test process on the cloud platform (200).
10. The method for detecting the pressure of the building pressure regulating station according to claim 6, wherein the method comprises the following steps: in the second step, the monitoring terminal (100) judges the leakage amount according to the abnormal pressure state of the threshold value and the following method:
a. if the set threshold value 1 is more than or equal to the Pmaximum value, and the Pminimum value is more than the set threshold value 2, the leakage is judged to be slight;
b. if the set threshold value 2 is more than or equal to the Pmax value-Pmin value and is more than the set threshold value 3, judging that the leakage is small;
c. if the set threshold value 3 is larger than or equal to the Pmax value-Pmin value, the leakage is judged to be large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211005613.5A CN115355454A (en) | 2022-08-22 | 2022-08-22 | Building pressure regulating station pressure detection device and detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211005613.5A CN115355454A (en) | 2022-08-22 | 2022-08-22 | Building pressure regulating station pressure detection device and detection method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115355454A true CN115355454A (en) | 2022-11-18 |
Family
ID=84001743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211005613.5A Pending CN115355454A (en) | 2022-08-22 | 2022-08-22 | Building pressure regulating station pressure detection device and detection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115355454A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118090025A (en) * | 2024-04-28 | 2024-05-28 | 航宇星物联科技(辽宁)有限公司 | Intelligent gas meter pressure abnormality alarm detection and judgment method |
| CN118247927A (en) * | 2024-05-29 | 2024-06-25 | 杭州先锋电子技术股份有限公司 | Dynamic leakage monitoring and grading early warning system based on intelligent gas meter of Internet of things |
-
2022
- 2022-08-22 CN CN202211005613.5A patent/CN115355454A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118090025A (en) * | 2024-04-28 | 2024-05-28 | 航宇星物联科技(辽宁)有限公司 | Intelligent gas meter pressure abnormality alarm detection and judgment method |
| CN118247927A (en) * | 2024-05-29 | 2024-06-25 | 杭州先锋电子技术股份有限公司 | Dynamic leakage monitoring and grading early warning system based on intelligent gas meter of Internet of things |
| CN118247927B (en) * | 2024-05-29 | 2024-08-27 | 杭州先锋电子技术股份有限公司 | Dynamic leakage monitoring and grading early warning system based on intelligent gas meter of Internet of things |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115355454A (en) | Building pressure regulating station pressure detection device and detection method thereof | |
| CN111578149B (en) | Gas pipeline leakage monitoring method, device and system and storage medium | |
| CN200986521Y (en) | SF6 gas density relay check meter | |
| CN102294102A (en) | Fire extinguishing system network intelligent control device | |
| CN110336379A (en) | Transformer Substation Online Monitoring System and terminal device based on Internet of Things | |
| CN111260087A (en) | Management system for pipe network abnormity | |
| CN107340368A (en) | A kind of tap water quality monitoring record device and its monitoring method | |
| WO2024031855A1 (en) | Remote monitoring system for oil and gas in high-voltage bushing | |
| CN110685742A (en) | Automatic control system for underground drainage of coal mine | |
| CN115184817A (en) | Storage battery online monitoring system | |
| CN209196566U (en) | A kind of intelligent pipeline safety monitoring device and system | |
| CN112202241A (en) | Distribution network equipment state monitoring and fault judgment system | |
| CN202199019U (en) | Intelligent network control device for firefighting system | |
| CN216647165U (en) | Thing networking fire control water supply control system | |
| WO2022021539A1 (en) | Intelligent control methods for solution microparticle signal collection, device and server | |
| CN104793270A (en) | Comprehensive judging method of operation states of equipment in comprehensive meteorological observation network | |
| CN212644272U (en) | Water leakage prevention control device | |
| CN109599946A (en) | A kind of Efficient fault diagnostic method of power distribution automation switch | |
| CN212154859U (en) | Automatic control system for underground drainage of coal mine | |
| CN202003204U (en) | Embedded-type remote monitoring device for pipe network water quality | |
| CN115841737B (en) | Gas safety monitoring method and device constructed on gas cutting-off device | |
| CN210572666U (en) | Rural power grid distribution transformer temperature monitoring cloud service system based on Internet of things | |
| CN112664439A (en) | Secondary water supply intelligent control system | |
| CN115792156A (en) | Multi-parameter water quality on-line monitoring control method and device | |
| CN205580658U (en) | Oil supplementing device is got to few oily equipment on -line pressure monitoring of electric power and automatic ration |
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 |