CN112462706A - Data acquisition and monitoring control system - Google Patents
Data acquisition and monitoring control system Download PDFInfo
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- CN112462706A CN112462706A CN202011293656.9A CN202011293656A CN112462706A CN 112462706 A CN112462706 A CN 112462706A CN 202011293656 A CN202011293656 A CN 202011293656A CN 112462706 A CN112462706 A CN 112462706A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4183—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by data acquisition, e.g. workpiece identification
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/31—From computer integrated manufacturing till monitoring
- G05B2219/31282—Data acquisition, BDE MDE
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a data acquisition and monitoring control system, which comprises a periodic data acquisition unit, an uploading unit, a wireless network and a wired network, wherein the data acquisition unit is used for processing the acquired data and uploading the data, the acquired data is uploaded through the wireless network, if the wireless network signals are poor or damaged, the wireless network signals are switched to the wired network for uploading in real time, the gathered data is analyzed and judged in an early warning way, and when the detected information belongs to abnormal information, the information is distributed in an abnormal area for display. The invention carries out data acquisition through different acquisition ends, controls the acquisition ends to carry out periodic acquisition through the timing module, carries out wireless transmission on the acquired data, directly triggers switching under the condition that a wireless transmission structure is damaged, carries out wired transmission, is more intelligent, ensures the normal operation of the whole acquisition monitoring system, regularly displays through the display module, has considerable replacement image, carries out red display and gives an alarm when abnormal information exists, and alarms in two alarm modes from different frequencies.
Description
Technical Field
The invention relates to the technical field of data acquisition systems, in particular to a data acquisition and monitoring control system.
Background
In the production activity in-process of some mills, need use the change of each link of whole mill of a set of data acquisition system real-time supervision, make things convenient for the administrator to accomplish wholly to control, present monitoring process only carries out real time monitoring through the camera, because external environment's constantly change, data transmission structure and fragile cause data to lose, influence the monitoring, for this reason, we propose a data acquisition and monitoring control system.
Disclosure of Invention
Therefore, the invention aims to provide a data acquisition and monitoring control system, which carries out data acquisition through different acquisition ends, controls the acquisition ends to carry out periodic acquisition through a timing module, carries out wireless transmission on the acquired data, directly triggers switching under the condition that a wireless transmission structure is damaged, carries out wired transmission, is intelligent, ensures the normal operation of the whole acquisition and monitoring system, carries out regular display through a display module, is visible in image replacement, carries out red display and gives an alarm when abnormal information exists, and carries out alarm in two alarm modes from different frequencies.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a data acquisition and monitoring control system comprising:
acquiring data such as external temperature, pressure, light sensation, humidity and the like;
continuously acquiring all data according to a specified acquisition period within 10-20 seconds, wherein the acquisition period is determined according to the change of the environment;
the acquired data are processed and then uploaded through an uploading unit, the acquired data are uploaded through a wireless network, and if the wireless network signals are poor or damaged, the wireless network is switched to a wired network for uploading in real time;
carrying out early warning analysis and judgment on the collected data, and carrying out targeted display;
and when the detected information belongs to abnormal information, the abnormal information is distributed in the abnormal area for display, and the normal information data is displayed in the normal display area in a partition mode.
As a preferred scheme of the data acquisition and monitoring control system of the present invention, the specifically related unit structure is:
the acquisition module comprises a first data acquisition end, a second data acquisition end and a third data acquisition end which are connected with the first data acquisition end in parallel;
the timing unit is used for controlling the acquisition module to perform periodic acquisition;
the uploading module comprises data processing units respectively connected to different acquisition ends, a wireless uploading unit electrically connected with the data processing units and a wired uploading unit connected with the wireless uploading unit;
the monitoring module comprises a data collection unit and an early warning judgment unit, wherein the data collection unit is respectively connected to the two uploading units of the uploading module, and the early warning judgment unit is connected to the data collection unit;
and the display module comprises a display unit connected to the early warning judgment unit, a normal display area and an abnormal display area which are connected with the display unit in parallel, and the abnormal display area is connected with an alarm unit.
As a preferred embodiment of the data acquisition and monitoring control system of the present invention, the wireless uploading unit is provided with a module for determining whether data can be uploaded, and when the data cannot be uploaded wirelessly, the wireless uploading unit is directly switched to perform wired transmission.
As a preferable scheme of the data acquisition and monitoring control system of the present invention, a plurality of acquisition ends in the acquisition module are provided, and a plurality of different acquisition ends adopt different information.
As a preferable scheme of the data acquisition and monitoring control system of the present invention, the normal display area is displayed in green, and the abnormal display area is displayed in red.
As a preferable aspect of the data collection and monitoring control system of the present invention, the alarm unit includes a loud speaker and a buzzer.
Compared with the prior art, the invention has the beneficial effects that: the data acquisition is carried out through different acquisition ends, the acquisition ends are controlled by the timing module to carry out periodic acquisition, the acquired data are wirelessly transmitted, the switching is directly triggered under the condition that a wireless transmission structure is damaged, the wired transmission is carried out, the system is intelligent, the normal operation of the whole acquisition monitoring system is ensured, the regular display is carried out through the display module, the image change is considerable, the red display is carried out and the alarm is given out when abnormal information exists, two alarm modes give an alarm from different frequencies, when the system is particularly used, the data acquisition is carried out through the first data acquisition end, the second data acquisition end and the third data acquisition end to acquire the data of external temperature, pressure, light sensation, humidity and the like, all data are continuously acquired according to the specified acquisition period in the second-second period through the timing unit in the acquisition process, and the acquisition period is determined according to the change of the environment, the collected data is uploaded through an uploading unit after being processed, the collected data is uploaded through a wireless uploading unit based on a wireless network, if the wireless network signal is poor or damaged, the wireless network signal is switched to the wired uploading unit in real time to upload, so that the normal operation of the whole system is ensured, a plurality of different pieces of information are monitored, are subjected to summary analysis through the data collecting unit and are subjected to screening analysis through the early warning judgment unit, if the monitored numerical value is abnormal, the numerical value can be displayed independently for distinguishing, so that the fault can be discriminated in time, when the detected information belongs to abnormal information, the abnormal information is distributed in the abnormal area for display, the normal information data is displayed in the normal display area in a partition mode, the normal display area is displayed in green, the abnormal display area is red for display, and the alarm unit includes loudspeaker and bee calling organ of raising one's voice, carries out data acquisition through the collection end of difference.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise. Wherein:
fig. 1 is a block diagram of a data acquisition and monitoring control system according to the present invention.
In the figure: 100. an acquisition module; 110. a first data acquisition end; 120. a second data acquisition end; 130. a third data acquisition end; 200. a timing unit; 300. an uploading module; 310. a data processing unit; 320. a wireless uploading unit; 330. a wired uploading unit; 400. a monitoring module; 410. a data collection unit; 420. an early warning judgment unit; 500. a display module; 510. a display unit; 520. a normal display area; 530. an exception display area; 540. an alarm unit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and it will be apparent to those of ordinary skill in the art that the present invention may be practiced without departing from the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides a data acquisition and monitoring control system, which carries out data acquisition through different acquisition ends, controls the acquisition ends to carry out periodic acquisition through a timing module, carries out wireless transmission on the acquired data, directly triggers switching under the condition that a wireless transmission structure is damaged, carries out wired transmission, is relatively intelligent, ensures the normal operation of the whole acquisition and monitoring system, carries out regular display through a display module, is visible in replacement image, carries out red display and sends out an alarm when abnormal information exists, and carries out alarm in two alarm modes from different frequencies.
Fig. 1 is a schematic diagram illustrating an overall structure of an embodiment of a data acquisition and monitoring control system according to the present invention, and referring to fig. 1, the data acquisition and monitoring control system according to the present embodiment includes: acquisition module 100, timing unit 200, upload module 300, monitoring module 400, and display module 500.
The acquisition module 100 is used for information acquisition, and specifically, the acquisition module 100 includes a first data acquisition end 110, a second data acquisition end 120 and a third data acquisition end 130 connected in parallel with the first data acquisition end 110, and when the data acquisition module is used specifically, different data acquisition ends perform data acquisition and respectively acquire different information.
The timing unit 200 is used for controlling the acquisition module 100 to perform periodic acquisition, and specifically, the timing unit 200 controls the first data acquisition end 110, the second data acquisition end 120, and the third data acquisition end 130.
The monitoring module 400 is used for data summarization processing and processing, and specifically, the monitoring module 400 comprises a data collection unit 410 connected to two uploading units of the uploading module 300 and an early warning judgment unit 420 connected to the data collection unit 410, when the monitoring module is used specifically, a plurality of different information are monitored, summarized and analyzed through the data collection unit 410, screened and analyzed through the early warning judgment unit 420, if the monitored numerical value is abnormal, the monitored numerical value can be displayed independently and distinguished, and faults can be distinguished conveniently and timely distinguished.
With reference to fig. 1, in a specific use of the data acquisition and monitoring control system of the present embodiment, data acquisition is performed through the first data acquisition end 110, the second data acquisition end 120, and the third data acquisition end 130 to obtain data such as external temperature, pressure, light sensation, humidity, and the like, during the acquisition process, all data are continuously acquired through the timing unit 200 within 10 seconds to 20 seconds according to a specified acquisition period, the acquisition period is determined according to a change of an environment, the acquired data are processed and then uploaded through the uploading unit, the acquired data are uploaded through the wireless uploading unit 320 based on a wireless network, if a wireless network signal is poor or damaged, the wireless network signal is switched to the wired uploading unit 330 in real time to upload to ensure normal operation of the entire system, a plurality of different pieces of information are monitored to be summarized and analyzed through the data collection unit 410, the early warning judgment unit 420 is used for screening and analyzing, if the monitored numerical value is abnormal, the abnormal numerical value can be displayed independently and distinguished, faults can be distinguished conveniently and timely, when the detected information belongs to abnormal information, the abnormal information is distributed in abnormal areas to be displayed, normal information data is displayed through the normally displayed areas in a partitioned mode, the normal display area 520 is displayed in a green mode, the abnormal display area 530 is displayed in a red mode, the alarm unit 540 comprises a loudspeaker and a buzzer, data acquisition is carried out through different acquisition ends, the acquisition ends are controlled to be periodically acquired through the timing module, the acquired data are wirelessly transmitted, switching is directly triggered under the condition that the wireless transmission structure is damaged, wired transmission is carried out, intelligence is achieved, the whole acquisition and monitoring system is guaranteed to normally operate, regular display is carried out through the display module, the image is changed to be considerable, when abnormal information exists, red display is carried out, and an alarm is sent out, the two alarm modes alarm from different frequencies.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. A data acquisition and monitoring control system, comprising:
acquiring data such as external temperature, pressure, light sensation, humidity and the like;
continuously acquiring all data according to a specified acquisition period within 10-20 seconds, wherein the acquisition period is determined according to the change of the environment;
the acquired data are processed and then uploaded through an uploading unit, the acquired data are uploaded through a wireless network, and if the wireless network signals are poor or damaged, the wireless network is switched to a wired network for uploading in real time;
carrying out early warning analysis and judgment on the collected data, and carrying out targeted display;
and when the detected information belongs to abnormal information, the abnormal information is distributed in the abnormal area for display, and the normal information data is displayed in the normal display area in a partition mode.
2. A data acquisition and monitoring control system according to claim 1, wherein the specifically related unit structure is:
the acquisition module (100) comprises a first data acquisition end (110), a second data acquisition end (120) and a third data acquisition end (130), wherein the second data acquisition end and the third data acquisition end are connected with the first data acquisition end (110) in parallel;
the timing unit (200) is used for controlling the acquisition module (100) to perform periodic acquisition;
the uploading module (300) comprises data processing units (310) respectively connected to different acquisition ends, a wireless uploading unit (320) electrically connected with the data processing units (310), and a wired uploading unit (330) connected with the wireless uploading unit (320);
the monitoring module (400) comprises a data collection unit (410) which is respectively connected to the two uploading units of the uploading module (300) and an early warning judgment unit (420) which is connected to the data collection unit (410);
the display module (500) comprises a display unit (510) connected to the early warning judgment unit (420), a normal display area (520) and an abnormal display area (530) which are connected with the display unit (510) in parallel, and the abnormal display area (530) is connected with an alarm unit (540).
3. The data acquisition and monitoring control system according to claim 2, wherein the wireless uploading unit (320) is provided with a module for judging whether data can be uploaded, and when the data cannot be uploaded wirelessly, the wireless uploading unit is directly switched to perform wired transmission.
4. A data collection and monitoring control system according to claim 3, characterized in that a plurality of collection terminals are provided in the collection module (100), and a plurality of different collection terminals take different information.
5. The data collection and monitoring control system of claim 4, wherein the normal display area (520) is displayed in green and the abnormal display area (530) is displayed in red.
6. A data acquisition and monitoring control system according to claim 5, characterized in that said alarm unit (540) comprises a loud speaker and a buzzer.
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| CN202011293656.9A CN112462706A (en) | 2020-11-18 | 2020-11-18 | Data acquisition and monitoring control system |
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| CN202011293656.9A CN112462706A (en) | 2020-11-18 | 2020-11-18 | Data acquisition and monitoring control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324592A (en) * | 2021-06-30 | 2021-08-31 | 国网河北省电力有限公司信息通信分公司 | System, method, switching device and storage medium for pipe gallery monitoring |
| CN116895147A (en) * | 2023-06-21 | 2023-10-17 | 清华大学 | Road condition monitoring method, device, sensor and computer equipment |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369932A (en) * | 2008-09-26 | 2009-02-18 | 广州市聚晖电子科技有限公司 | Data collection apparatus adopting double standby links and use method thereof |
| CN102438037A (en) * | 2011-09-29 | 2012-05-02 | 上海中科深江电动车辆有限公司 | System and method for remotely monitoring running data in hybrid vehicle |
| CN106200602A (en) * | 2016-09-07 | 2016-12-07 | 东北大学 | A kind of based on Internet of Things and the industry preparation equipment moving monitoring system of cloud and method |
| US20180073682A1 (en) * | 2012-06-19 | 2018-03-15 | Shailendra Kumar Suman | Propane tank continuous monitoring system |
| CN108230592A (en) * | 2017-09-30 | 2018-06-29 | 广州汇安科技有限公司 | A kind of marine site sensing warnlng surveillance system and method |
| CN110865622A (en) * | 2019-12-06 | 2020-03-06 | 湖南精正设备制造有限公司 | Production line information acquisition system |
| CN110930673A (en) * | 2019-12-02 | 2020-03-27 | 上海宝钢工业技术服务有限公司 | Dual-communication automatic switching system and method for intelligent wireless temperature and humidity monitor |
| CN111447140A (en) * | 2019-01-17 | 2020-07-24 | 国网电子商务有限公司 | Intelligent data acquisition gateway, redundant network communication system and method |
| EP3734143A2 (en) * | 2011-03-21 | 2020-11-04 | Digital Lumens Incorporated | Methods, apparatus and systems for providing occupancy-based variable lighting |
-
2020
- 2020-11-18 CN CN202011293656.9A patent/CN112462706A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369932A (en) * | 2008-09-26 | 2009-02-18 | 广州市聚晖电子科技有限公司 | Data collection apparatus adopting double standby links and use method thereof |
| EP3734143A2 (en) * | 2011-03-21 | 2020-11-04 | Digital Lumens Incorporated | Methods, apparatus and systems for providing occupancy-based variable lighting |
| CN102438037A (en) * | 2011-09-29 | 2012-05-02 | 上海中科深江电动车辆有限公司 | System and method for remotely monitoring running data in hybrid vehicle |
| US20180073682A1 (en) * | 2012-06-19 | 2018-03-15 | Shailendra Kumar Suman | Propane tank continuous monitoring system |
| CN106200602A (en) * | 2016-09-07 | 2016-12-07 | 东北大学 | A kind of based on Internet of Things and the industry preparation equipment moving monitoring system of cloud and method |
| CN108230592A (en) * | 2017-09-30 | 2018-06-29 | 广州汇安科技有限公司 | A kind of marine site sensing warnlng surveillance system and method |
| CN111447140A (en) * | 2019-01-17 | 2020-07-24 | 国网电子商务有限公司 | Intelligent data acquisition gateway, redundant network communication system and method |
| CN110930673A (en) * | 2019-12-02 | 2020-03-27 | 上海宝钢工业技术服务有限公司 | Dual-communication automatic switching system and method for intelligent wireless temperature and humidity monitor |
| CN110865622A (en) * | 2019-12-06 | 2020-03-06 | 湖南精正设备制造有限公司 | Production line information acquisition system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324592A (en) * | 2021-06-30 | 2021-08-31 | 国网河北省电力有限公司信息通信分公司 | System, method, switching device and storage medium for pipe gallery monitoring |
| CN116895147A (en) * | 2023-06-21 | 2023-10-17 | 清华大学 | Road condition monitoring method, device, sensor and computer equipment |
| CN116895147B (en) * | 2023-06-21 | 2024-03-12 | 清华大学 | Road condition monitoring method, device, sensor and computer equipment |
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Application publication date: 20210309 |