CN114674278B - Piston rod settlement monitoring system with threshold shielding function - Google Patents
Piston rod settlement monitoring system with threshold shielding function Download PDFInfo
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- CN114674278B CN114674278B CN202210417389.4A CN202210417389A CN114674278B CN 114674278 B CN114674278 B CN 114674278B CN 202210417389 A CN202210417389 A CN 202210417389A CN 114674278 B CN114674278 B CN 114674278B
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- position sensor
- sinking displacement
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000006073 displacement reaction Methods 0.000 claims abstract description 64
- 238000012545 processing Methods 0.000 claims description 35
- 238000007405 data analysis Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 abstract description 3
- 239000000523 sample Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention discloses a piston rod settlement monitoring system with a threshold shielding function, and relates to the field of compressors. The technical scheme is characterized in that the data acquisition device transmits an acquisition instruction to the piston rod position sensor according to an angle signal transmitted by the crankshaft position sensor, and continuously measures the sinking displacement value of the piston rod in a 360-degree rotation period of the crankshaft, so that the sinking displacement value of the piston rod corresponds to the angle of the crankshaft. The invention has the threshold shielding function, can avoid unnecessary shutdown, and can analyze and pre-judge the trend of the sedimentation of the piston rod.
Description
Technical Field
The invention relates to the field of compressors, in particular to a piston rod settlement monitoring system with a threshold shielding function.
Background
For the reciprocating piston compressor, the piston part always reciprocates in the cylinder, and as most of the weight of the piston part acts on the supporting ring, the supporting ring is worn greatly after long-time use, the axis of the piston part is deviated from the center to contact with other parts, so that the piston rod, the cylinder sleeve and the packing part are damaged. In order to solve the problems, the scheme adopted at present is to monitor the sinking amount of the piston rod and carry out alarm prompt.
For example, an eddy current displacement sensor is arranged outside a flange of the cylinder packing box, and whether the piston rod is sunk or not is judged by monitoring the change of the distance (Y value) between a sensor probe and the surface of the piston rod. When the probe is arranged above the outer side of the flange, the monitored distance (Y value) increases to a certain value, and an alarm signal is sent out; when the probe is arranged below the outer side of the flange, the monitored distance (Y value) is reduced to a certain value, and an alarm signal is sent out. Similar structures are disclosed, for example, in the patent issued to CN203009264U, CN207686955U, CN211085093U and CN 20883171U.
However, since there is a gap between the piston and the cylinder, the stress state of the piston and the piston rod also changes, so that the piston rod has a certain amount of jump in the reciprocating process. Also, during operation, impurities entrained in the compressed medium, such as tar, catalyst fines, etc., may adhere to the surface of the piston rod or sensor probe.
Since the probe can only monitor and record an isolated measurement point, both of the above reasons may trigger a false alarm, resulting in unnecessary downtime.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a piston rod sedimentation monitoring system with a threshold shielding function, which has the threshold shielding function, can avoid unnecessary shutdown, and can analyze and pre-judge the sedimentation trend of the piston rod.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a piston rod settlement monitoring system with threshold shielding function, comprising:
the piston rod position sensor is used for continuously collecting the sinking displacement value of the piston rod;
the data acquisition device is connected with the piston rod position sensor;
the crank shaft position sensor is used for collecting the angle of the crank shaft;
the data processing unit is respectively connected with the data collector and the crankshaft position sensor;
a data server connected to the data processing unit; the method comprises the steps of,
the industrial personal computer is connected with the data server;
according to the angle signal sent by the crankshaft position sensor, the data acquisition device sends an acquisition instruction to the piston rod position sensor, and continuously measures the sinking displacement value of the piston rod in a 360-degree rotation period of the crankshaft, so that the sinking displacement value of the piston rod corresponds to the angle of the crankshaft.
Further, a limiting value of the sinking displacement value of the piston rod is arranged in the data processing unit, the received sinking displacement value is compared with the limiting value by the data processing unit, and the sinking displacement value reaching or exceeding the limiting value is defined as an overrun value; the overrun value is used as a monitoring basis for the data processing unit to send out an alarm signal;
an isolated super-limit value which does not accord with the variation trend of the sinking displacement value and appears in the rotation period of the crankshaft is defined as an isolated threshold value; the isolation threshold value is not used as a monitoring basis for the data processing unit to send out an alarm signal.
Further, a limiting value of the sinking displacement value of the piston rod is arranged in the data processing unit, the received sinking displacement value is compared with the limiting value by the data processing unit, and the sinking displacement value reaching or exceeding the limiting value is defined as an overrun value;
the data processing unit sends out an alarm signal when an overrun occurs in at least two consecutive crankshaft rotation periods.
Further, the data processing unit may send an alarm signal when an overrun occurs for at least five consecutive crankshaft rotation periods.
Further, the data processing unit compares the received sinking displacement value with the sinking displacement value of the previous crankshaft rotation period, and sends out an early warning signal or an alarm signal according to the comparison result;
when an early warning signal is sent, the compressor can still continue to work, and when an alarm signal is sent, the compressor needs to stop working.
Further, the comparison result includes a difference value of the dip displacement value, or a rate of change of the difference value of the dip displacement value.
Further, a data analysis module is arranged in the industrial personal computer and comprises a device for carrying out trend analysis on sinking displacement values of different crankshaft rotation periods.
Further, the piston rod position sensor includes an upper piston rod position sensor and a lower piston rod position sensor that are oppositely disposed at an upper side and a lower side of the piston rod, respectively.
Further, the sinking displacement value acquired by the upper piston rod position sensor is compared with the sinking displacement value acquired by the lower piston rod position sensor, and the superposition value is taken as a monitoring basis.
Further, the data collector is connected with a plurality of piston rod position sensors.
In summary, the invention has the following beneficial effects:
1. the sinking displacement value of the piston rod corresponds to the angle of the crankshaft, so that the sinking displacement value can be periodically and accurately measured, monitored and analyzed;
2. the isolated threshold is not used as a monitoring basis for the data processing unit to send out an alarm signal, so that the threshold shielding function of the system is realized, and the shutdown caused by false alarm is effectively avoided;
3. when the exceeding limit value appears in at least five continuous crankshaft rotation periods, the data processing unit can send out an alarm signal, so that the accuracy of a monitoring result can be improved, and unnecessary shutdown is avoided;
4. trend analysis is carried out on the sinking displacement values of different crankshaft rotation periods, so that the sinking displacement values of the piston rod can be predicted, and further the abrasion trend of the piston supporting ring and the piston ring can be predicted.
Drawings
Fig. 1 is a schematic structural diagram of a piston rod settlement detection system with a threshold shielding function in an embodiment;
FIG. 2 is a schematic diagram of the dip displacement values versus crank angle in an embodiment.
In the figure: 1. a crankshaft; 2. a piston rod; 3. a data collector; 4. a data processing unit; 5. a data server; 6. and the industrial personal computer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Examples:
a piston rod settlement monitoring system with a threshold shielding function, referring to fig. 1 and 2, comprises a piston rod position sensor, a data collector 3, a crank shaft position sensor, a data processing unit 4, a data server 5 and an industrial personal computer 6; wherein the piston rod position sensor is used for continuously acquiring the sinking displacement value of the piston rod 2, the crank shaft position sensor is used for acquiring the angle of the crank shaft 1, the data processing unit 4 is respectively connected with the data collector 3 and the crank shaft position sensor, and a signal isolation grid is arranged between the crank shaft position sensor and the data processing unit 4; according to the angle signal sent by the crank shaft position sensor, the data collector 3 sends a collection instruction to the piston rod position sensor, and continuously measures the sinking displacement value of the piston rod 2 in the 360-degree rotation period of the crank shaft 1, so that the sinking displacement value of the piston rod 2 corresponds to the angle of the crank shaft 1; in this embodiment, the sinking displacement value of the piston rod 2 corresponds to the angle of the crankshaft 1, so that the sinking displacement value can be periodically and accurately measured, monitored and analyzed, and a threshold shielding function can be conveniently realized to avoid unnecessary shutdown.
Referring to fig. 1 and 2, specifically, a limit value of the sinking displacement value of the piston rod 2 is set in the data processing unit 4, and the sinking displacement value reaching or exceeding the limit value is defined as an overrun value according to the processing unit 4 comparing the received sinking displacement value with the limit value; the exceeding limit value is used as a monitoring basis for the data processing unit 4 to send out an alarm signal; an isolated overrun value that does not correspond to the trend of the dip displacement value change that occurs during the crankshaft rotation period is defined as an isolated threshold value, such as the isolated threshold value that occurs around 120 ° in fig. 2; in this embodiment, the isolated threshold is not used as a monitoring basis for the data processing unit 4 to send out an alarm signal, so as to implement a threshold shielding function of the system, thereby effectively avoiding shutdown caused by false alarm.
With reference to fig. 1 and 2, the data processing unit 4 preferably emits an alarm signal only when an overrun occurs during at least two consecutive crankshaft rotation periods; more preferably, the data processing unit 4 will only issue an alarm signal when an overrun occurs for at least five consecutive crankshaft rotation periods; specifically, in this embodiment, when the limit value is exceeded in all five consecutive crankshaft rotation periods, the data processing unit 4 will send out an alarm signal; the time of one crankshaft rotation period is very short, so that after the exceeding limit value is monitored in the first crankshaft rotation period, the four crankshaft rotation periods are continuously monitored again, delay is avoided, the accuracy of the monitoring result can be improved, and unnecessary shutdown is avoided.
Referring to fig. 1 and 2, in the present embodiment, the sinking displacement value of the piston rod 2 is continuously measured in a 360 ° rotation period of the crankshaft 1, so that the sinking displacement value of the piston rod 2 corresponds to the angle of the crankshaft 1, so that more choices exist for sending out an alarm signal according to the decision basis, and different types of compressors and more working conditions can be matched; for example, the data processing unit 4 compares the received sinking displacement value with the sinking displacement value of the previous crankshaft rotation period, and sends out an early warning signal or an alarm signal according to the comparison result; when an early warning signal is sent out, the compressor can still continue to work, and when an alarm signal is sent out, the compressor needs to stop working; wherein, the comparison result comprises a difference value of the sinking displacement value or a difference value change rate of the sinking displacement value;
referring to fig. 1 and 2, in this embodiment, a data analysis module (i.e. data analysis software) is disposed in the industrial personal computer 6, and the data analysis module is configured to display the sinking displacement values of the piston rod 2 in real time, and is configured to perform trend analysis on the sinking displacement values of different crankshaft rotation periods, so as to predict the sinking displacement values of the piston rod 2, and further predict the wear trend of the piston supporting ring and the piston ring.
Referring to fig. 1 and 2, it is preferable that the piston rod position sensor in the present embodiment includes an upper side piston rod position sensor and a lower side piston rod position sensor which are oppositely disposed at the upper side and the lower side of the piston rod 2, respectively; the sinking displacement value acquired by the upper piston rod position sensor is compared with the sinking displacement value acquired by the lower piston rod position sensor, and the superposition value is taken as a monitoring basis, so that the accuracy can be improved; specifically, the sinking displacement value acquired by the upper piston rod position sensor is positive, the sinking displacement value acquired by the lower piston rod position sensor is negative, the sinking displacement value acquired by the lower piston rod position sensor is compared with the sinking displacement value acquired by the upper piston rod position sensor after being opposite, and a numerical value with high complete coincidence or high coincidence degree is taken as a numerical value with high credibility and is taken as a monitoring basis, so that the accuracy can be improved.
Referring to fig. 1 and 2, the data collector 3 in this embodiment is connected with a plurality of piston rod position sensors; specifically, in this embodiment, the data collector 3 adopts distributed data collection and bus communication, that is, the monitoring information of each piston rod position sensor is summarized to the data collector 3, and then is sent to the data processing unit 4 in a bus (CAN bus or 485 bus) manner, so that on-site wiring and wiring CAN be reduced, and installation cost is saved.
Claims (9)
1. A piston rod settlement monitoring system with threshold shielding function, comprising:
the piston rod position sensor is used for continuously collecting the sinking displacement value of the piston rod;
the data acquisition device is connected with the piston rod position sensor;
the crank shaft position sensor is used for collecting the angle of the crank shaft;
the data processing unit is respectively connected with the data collector and the crankshaft position sensor;
a data server connected to the data processing unit; the method comprises the steps of,
the industrial personal computer is connected with the data server;
the method is characterized in that:
according to the angle signal sent by the crankshaft position sensor, the data acquisition device sends an acquisition instruction to the piston rod position sensor, and continuously measures the sinking displacement value of the piston rod in a 360-degree rotation period of the crankshaft, so that the sinking displacement value of the piston rod corresponds to the angle of the crankshaft;
the data processing unit compares the received sinking displacement value with a limiting value, and the sinking displacement value reaching or exceeding the limiting value is defined as an overrun value; the overrun value is used as a monitoring basis for the data processing unit to send out an alarm signal;
an isolated super-limit value which does not accord with the variation trend of the sinking displacement value and appears in the rotation period of the crankshaft is defined as an isolated threshold value; the isolation threshold value is not used as a monitoring basis for the data processing unit to send out an alarm signal.
2. The piston rod settlement monitoring system with the threshold shielding function according to claim 1, wherein: the data processing unit compares the received sinking displacement value with a limiting value, and the sinking displacement value reaching or exceeding the limiting value is defined as an overrun value;
the data processing unit sends out an alarm signal when an overrun occurs in at least two consecutive crankshaft rotation periods.
3. The piston rod settlement monitoring system with the threshold shielding function according to claim 2, wherein: the data processing unit sends out an alarm signal when an overrun occurs in at least five consecutive crankshaft rotation periods.
4. The piston rod settlement monitoring system with the threshold shielding function according to claim 1, wherein: the data processing unit compares the received sinking displacement value with the sinking displacement value of the previous crankshaft rotation period and sends out an early warning signal or an alarm signal according to the comparison result;
when an early warning signal is sent, the compressor can still continue to work, and when an alarm signal is sent, the compressor needs to stop working.
5. The piston rod settlement monitoring system with the threshold shielding function according to claim 4, wherein: the comparison result includes a difference in the dip displacement values, or a rate of change in the difference in the dip displacement values.
6. The piston rod settlement monitoring system with the threshold shielding function according to claim 1, wherein: the industrial personal computer is internally provided with a data analysis module, and the data analysis module is used for carrying out trend analysis on sinking displacement values of different crankshaft rotation periods.
7. The piston rod settlement monitoring system with the threshold shielding function according to claim 1, wherein: the piston rod position sensor includes an upper piston rod position sensor and a lower piston rod position sensor that are oppositely disposed at an upper side and a lower side of the piston rod, respectively.
8. The piston rod settlement monitoring system with the threshold shielding function according to claim 7, wherein: and comparing the sinking displacement value acquired by the upper piston rod position sensor with the sinking displacement value acquired by the lower piston rod position sensor, and taking the superposition value as a monitoring basis.
9. The piston rod settlement monitoring system with the threshold shielding function according to claim 1, wherein: the data acquisition device is connected with a plurality of piston rod position sensors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210417389.4A CN114674278B (en) | 2022-04-20 | 2022-04-20 | Piston rod settlement monitoring system with threshold shielding function |
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| CN202210417389.4A CN114674278B (en) | 2022-04-20 | 2022-04-20 | Piston rod settlement monitoring system with threshold shielding function |
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| CN114674278B true CN114674278B (en) | 2024-02-09 |
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| DE29624456U1 (en) * | 1996-05-08 | 2003-12-18 | Kabushiki Kaisha Toyota Jidoshokki, Kariya | Reciprocating compressor - comprises cylinder blocks with cylinder bores, driving shaft supported on cylinder blocks, swash plate fixed to driving shaft, etc. |
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| CN101813563A (en) * | 2009-12-15 | 2010-08-25 | 吉林大学 | Engine piston position and phase position full operation condition measurement system and method |
| CN107300375A (en) * | 2017-08-21 | 2017-10-27 | 四川西南交大铁路发展股份有限公司 | A kind of high-speed railway subgrade Monitoring method of the subsidence and system |
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| CN111566330A (en) * | 2018-01-16 | 2020-08-21 | 法国大陆汽车公司 | Method for detecting a physical shutdown of an engine |
| CN113123952A (en) * | 2019-12-30 | 2021-07-16 | 无锡康茨压缩机配件与***有限公司 | Load signal linearization processing method for stepless air volume adjustment of compressor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9562823B2 (en) * | 2014-01-22 | 2017-02-07 | Deere & Company | Determining cylinder health in a reciprocating piston engine |
-
2022
- 2022-04-20 CN CN202210417389.4A patent/CN114674278B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29624456U1 (en) * | 1996-05-08 | 2003-12-18 | Kabushiki Kaisha Toyota Jidoshokki, Kariya | Reciprocating compressor - comprises cylinder blocks with cylinder bores, driving shaft supported on cylinder blocks, swash plate fixed to driving shaft, etc. |
| CN101126637A (en) * | 2006-08-16 | 2008-02-20 | 安德烈亚斯.斯蒂尔两合公司 | Method for determining the crankshaft position of a rotating crankshaft of an internal combustion engine |
| CN101813563A (en) * | 2009-12-15 | 2010-08-25 | 吉林大学 | Engine piston position and phase position full operation condition measurement system and method |
| CN107300375A (en) * | 2017-08-21 | 2017-10-27 | 四川西南交大铁路发展股份有限公司 | A kind of high-speed railway subgrade Monitoring method of the subsidence and system |
| CN111566330A (en) * | 2018-01-16 | 2020-08-21 | 法国大陆汽车公司 | Method for detecting a physical shutdown of an engine |
| CN109780121A (en) * | 2019-02-13 | 2019-05-21 | 重庆大学 | Anti-settling MR damper based on on-line monitoring |
| CN113123952A (en) * | 2019-12-30 | 2021-07-16 | 无锡康茨压缩机配件与***有限公司 | Load signal linearization processing method for stepless air volume adjustment of compressor |
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