CN116972791A - Online monitoring and early warning method, system, medium and storage setting for metal expansion joint - Google Patents
Online monitoring and early warning method, system, medium and storage setting for metal expansion joint Download PDFInfo
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- CN116972791A CN116972791A CN202310890463.9A CN202310890463A CN116972791A CN 116972791 A CN116972791 A CN 116972791A CN 202310890463 A CN202310890463 A CN 202310890463A CN 116972791 A CN116972791 A CN 116972791A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012544 monitoring process Methods 0.000 title claims abstract description 28
- 239000002184 metal Substances 0.000 title claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 110
- 210000001061 forehead Anatomy 0.000 claims description 18
- 238000004590 computer program Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 2
- 230000008602 contraction Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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Abstract
The invention relates to the technical field of industrial pipeline/flue system monitoring, in particular to a metal expansion joint on-line monitoring and early warning method, a system, a medium and storage setting, wherein the method comprises the following steps: s1, mounting a displacement sensor and a strain sensor on an expansion joint at the inlet or outlet of a pump and a fan in a pipeline and flue system, and setting a displacement stroke L of the expansion joint when not working; s2, when the expansion joint works, the displacement sensor and the strain sensor acquire displacement signals and strain signals of the expansion joint and transmit the displacement signals and the strain signals to the computer system for analyzing and calculating real-time states of the displacement sensor and the strain sensor; and S3, monitoring the real-time state of the expansion joint according to the calculation result of the computer system, and issuing and displaying the real-time state by a display. The invention adopts the displacement sensor, the strain sensor and the computer system to monitor the expansion joint in real time, can collect data in real time, monitor and detect the running state, and improve the working efficiency.
Description
Technical Field
The invention relates to the technical field of industrial pipeline/flue system monitoring, in particular to a method, a system, a medium and storage arrangement for on-line monitoring and early warning of a metal expansion joint.
Background
The metal expansion joint has wide application, is mainly used for industrial pipeline/flue systems, is generally arranged at the inlet and outlet of a pump and a fan, and is used for compensating the thermal expansion and cold contraction displacement of a pipeline and reducing the thrust of the pipeline displacement to equipment and vibration generated in operation. The metal expansion joint is mainly divided into a bent pipe expansion joint, a corrugated pipe expansion joint and a sleeve expansion joint, and the corrugated pipe (an elastic element) and accessories such as an end pipe, a bracket, a flange, a conduit and the like which form a working main body of the metal expansion joint. The effective expansion and contraction deformation of the elastic element of the working main body is utilized to absorb the dimensional change generated by the heat expansion and cold contraction of the pipeline or compensate the axial, transverse and angular displacement of the pipeline/flue.
Because the operation working condition of the industrial equipment is complex and changeable, the medium temperature is unstable, the transportation pipeline/flue system is frequently expanded with heat and contracted with cold, the repeated displacement of the expansion joint is changed, and the fatigue, failure and damage of the elastic element directly affect the safety, reliability and stability of the pipeline/flue system.
At present, the field use of the expansion joint is not provided with an accurate detection method, and the expansion joint of the corrugated pipe only has the pull rod bolt as the axial displacement limitation during installation, so that the error in actual use is larger. The existing metal expansion joint stress strain force monitoring method has certain limitations: the manual inspection is relied on, the working efficiency is low, the technical requirements on personnel are high, and potential safety hazards exist; the expansion joint pull rod bolt can only limit axial displacement and has large error; the stress and strain conditions of the expansion joint cannot be monitored in real time.
Disclosure of Invention
Aiming at the problem of single monitoring method of stress strain force condition of expansion joint in the prior art, the invention provides an on-line monitoring and early warning method, system, medium and storage arrangement of the metal expansion joint, which provides basis for pump/fan fault identification, analysis and judgment by utilizing real-time data and historical data, and aims to solve the defects of inconvenient inspection, large measurement error, incapability of real-time state monitoring and early warning and the like in the operation of the metal expansion joint of a pipeline/flue in the field.
The invention is realized by the following technical scheme:
an on-line monitoring and early warning method for a metal expansion joint comprises the following steps:
s1, mounting a displacement sensor and a strain sensor on an expansion joint at the inlet or outlet of a pump and a fan in a pipeline and flue system, and setting a displacement stroke L of the expansion joint when not working;
s2, when the expansion joint works, the displacement sensor and the strain sensor acquire displacement signals and strain signals of the expansion joint and transmit the displacement signals and the strain signals to the computer system, and the real-time state of the displacement sensor and the real-time state of the strain sensor are obtained through analysis of the computer system;
and S3, monitoring the real-time state of the expansion joint according to the real-time state of the displacement sensor and the real-time state of the strain sensor, and issuing real-time display by a display.
Preferably, in S1, the displacement sensor is mounted on a tie rod of the expansion joint; the strain sensor is arranged on the corrugated pipe at the middle position of the expansion joint.
Preferably, in S2, the real-time state of the displacement sensor is analyzed as follows: calibrating the displacement L of the expansion joint when not working Label (C) The displacement stroke L1 under the rated working condition and the displacement stroke S of the expansion joint during working, wherein '(+ -)' represents the displacement direction of the expansion joint, the expansion joint is compressed to 'plus', the expansion is stretched to 'minus', and when L=L Label (C) When the expansion joint is not in operation, L is the displacement stroke of the expansion joint:
when L1 is between L+/-S, the displacement sensor is in a normal state, and the displacement sensor displays normal;
when L1 is smaller than L-S or L1 is larger than L+S, the displacement sensor is in an early warning state and sends out a displacement early warning signal.
Preferably, in S2, the real-time state of the displacement sensor is analyzed as follows: calibrating the displacement L of the expansion joint when not working Label (C) The displacement stroke L1 under the rated working condition and the displacement stroke S during working, wherein '(+ -)' represents the displacement direction of the expansion joint, the expansion joint is compressed to 'plus', the extension is 'minus', and when L is not equal to L Label (C) When first correcting l=l Label (C) According to L=L Label (C) The state of the displacement sensor is analyzed.
Preferably, when corrected, by L Label (C) Obtaining displacement deviation + -delta L with L, wherein "±" represents the displacement direction of the expansion joint, the expansion joint is compressed to "+" and the elongation is "-"; and then by adjusting the mounting position of the expansion joint when not in operationThe displacement deviation + -DeltaL is eliminated such that L=L Label (C) 。
Preferably, in S2, the real-time state of the strain sensor is analyzed as follows: setting the rated load of the strain sensor as sigma Forehead (forehead) The strain force of the expansion joint during operation is sigma;
when sigma is equal to or greater than sigma Forehead (forehead) When the strain sensor is in an early warning state, and a strain early warning signal is sent out;
when sigma is smaller than sigma Forehead (forehead) When the strain sensor is in a normal state.
Preferably, in S3, the real-time state of the expansion joint is divided into a normal state, an early warning state and an abnormal state according to the real-time state of the displacement sensor and the real-time state of the strain sensor;
when the strain sensor and the displacement sensor are in a normal state, the expansion joint is in a normal state;
when the displacement sensor or the strain sensor is in an early warning state, the expansion joint is in an early warning state;
when the displacement sensor and the strain sensor are both in an early warning state, the expansion joint is in an abnormal state.
The system comprises a data acquisition module, an analysis module and a data output module, wherein the data acquisition module is used for acquiring real-time data of the expansion joint, the analysis module is used for calculating the real-time data, and the data output module is used for outputting the real-time state of the expansion joint.
A terminal device comprising a memory, a processor and a computer program stored in the memory and running on the processor, the processor implementing the steps of the method when executing the computer program.
A computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method.
Compared with the prior art, the invention has the following beneficial effects:
according to the on-line monitoring and early warning method for the metal expansion joint, disclosed by the invention, the displacement sensor, the strain sensor and the computer system are adopted to monitor the expansion joint in real time, so that the real-time data acquisition can be realized, the running state can be detected, and the working efficiency can be improved. Meanwhile, the computer system has a data storage function, and the running state and performance are evaluated through historical data comparison and analysis, so that accurate and rapid early warning is realized, and safety guarantee is provided for the whole pipeline/flue system.
Furthermore, in the industrial pipeline/flue system, especially at the inlet and outlet of the pump/fan, displacement sensors are added (installed) on all the bellows expansion joints at different positions, so that on-site digital display can be realized, and the requirements of collecting the static (original installation) and dynamic displacement of the bellows expansion joints in the running process are met.
Furthermore, a strain sensor is arranged on the corrugated pipe at the middle position of the expansion joint, all detection data are transmitted to a computer (or a control system) through a signal acquisition device, deformation data of the expansion joint of the corrugated pipe are analyzed and displayed, and the functions of on-line real-time monitoring and state early warning can be realized.
Furthermore, a displacement and strain dynamic quantity combined type early warning method is selected to detect the state of the expansion joint, because the change of the medium temperature in the pipeline can cause the axial displacement of the expansion joint, the combined type early warning method can effectively monitor the axial displacement, the change of the medium pressure in the pipeline can cause the radial expansion of the corrugated pipe, the deformation quantity can be effectively monitored, and the influence of the change of the medium in the pipeline on the expansion joint can be effectively monitored.
Drawings
FIG. 1 is a schematic diagram of the positions of a displacement sensor and a strain sensor in the on-line monitoring and early warning method of a metal expansion joint.
FIG. 2 is a flow chart of a method for on-line monitoring and early warning of a metal expansion joint according to the present invention.
In the figure, 1, a pull rod; 2. a displacement sensor; 3. a flange plate; 4. a sleeve; 5. a bellows; 6. a strain sensor.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention discloses an online monitoring and early warning method for a metal expansion joint, which comprises the following steps with reference to figures 1 and 2:
s1, installing a displacement sensor and a strain sensor on an expansion joint at the inlet or outlet of a pump and a fan in a pipeline and flue system, and setting the displacement stroke L of the expansion joint when not working.
The expansion joint is a flexible element which can effectively compensate deformation, can compensate thermal expansion difference of a pipeline and a flue caused by temperature change, reduces axial load and deformation, and avoids strength damage, instability damage and pipe pull-out damage. The expansion joint comprises two pull rods, two flange plates, two sleeves and a corrugated pipe, wherein the sleeves and the flange plates are in one-to-one correspondence and are respectively arranged at two ends of the corrugated pipe, the flange plate sleeves are arranged at the outer sides of the sleeves, the two pull rods are symmetrically arranged at two sides of the corrugated pipe along the length axis of the corrugated pipe, and the end parts of the pull rods are connected with the flange plates through bolts. The strain sensor is arranged on the corrugated pipe at the middle position of the expansion joint.
And S2, when the expansion joint works, the displacement sensor and the strain sensor acquire displacement signals and strain signals of the expansion joint and transmit the displacement signals and the strain signals to the computer system, and the real-time state of the displacement sensor and the real-time state of the strain sensor are obtained through analysis of the computer system.
The displacement sensor is divided into two cases according to working conditions during calculation:
first kind: calibrating the displacement L of the expansion joint when not working Label (C) The displacement stroke L1 under the rated working condition and the displacement stroke S of the expansion joint during working, wherein '(+ -)' represents the displacement direction of the expansion joint, the expansion joint is compressed to 'plus', the expansion is stretched to 'minus', and when L=L Label (C) When (1):
when L1 is between L+/-S, the displacement sensor is in a normal state, and the displacement sensor displays normal;
when L1 is smaller than L-S or L1 is larger than L+S, the displacement sensor is in an early warning state and sends out a displacement early warning signal.
Second kind: calibrating the expansion joint when not in operationIs of the displacement travel L Label (C) The displacement stroke L1 under the rated working condition and the displacement stroke + -S during working, wherein '(+ -)' represents the displacement direction of the expansion joint, the expansion joint is compressed to 'plus', the expansion is stretched to 'minus', and when L is not equal to L, L=L is corrected first Label (C) According to L=L Label (C) The state of the displacement sensor is analyzed.
Wherein, during correction, L is used for Label (C) Obtaining displacement deviation + -delta L with L, wherein "±" represents the displacement direction of the expansion joint, the expansion joint is compressed to "+" and the elongation is "-"; the displacement deviation + -DeltaL is then eliminated by adjusting the mounting position of the expansion joint when not in operation such that L=L Label (C) 。
When the strain sensor calculates, the rated load of the strain sensor is set as sigma Forehead (forehead) The strain force of the expansion joint during operation is sigma;
when sigma is equal to or greater than sigma Forehead (forehead) When the strain sensor is in an early warning state, and a strain early warning signal is sent out;
when sigma is smaller than sigma Forehead (forehead) When the strain sensor is in a normal state.
S3, dividing the real-time state of the expansion joint into a normal state, an early warning state and an abnormal state according to the real-time state of the displacement sensor and the real-time state of the strain sensor, and issuing real-time display by a display, wherein the real-time display is specifically as follows:
when the strain sensor and the displacement sensor are in a normal state, the expansion joint is in a normal state;
when the displacement sensor or the strain sensor is in an early warning state, the expansion joint is in an early warning state;
when the displacement sensor and the strain sensor are both in an early warning state, the expansion joint is in an abnormal state.
The invention also discloses an on-line monitoring and early warning system for the stress deformation of the metal expansion joint, which comprises a data acquisition module, an analysis module and a data output module, wherein the data acquisition module is used for acquiring the real-time data of the expansion joint, the analysis module is used for calculating the real-time data, and the data output module is used for outputting the real-time state of the expansion joint.
The invention also discloses a terminal device comprising a memory, a processor and a computer program stored in the memory and running on the processor, the processor executing the steps of the method.
The invention also discloses a computer readable storage medium storing a computer program which when executed by a processor implements the steps of the method.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the technical solution of the present invention in any way, and it should be understood that the technical solution can be modified and replaced in several ways without departing from the spirit and principle of the present invention, and these modifications and substitutions are also included in the protection scope of the claims.
Claims (10)
1. The on-line monitoring and early warning method for the metal expansion joint is characterized by comprising the following steps of:
s1, mounting a displacement sensor and a strain sensor on an expansion joint at the inlet or outlet of a pump and a fan in a pipeline and flue system, and setting a displacement stroke L of the expansion joint when not working;
s2, when the expansion joint works, the displacement sensor and the strain sensor acquire displacement signals and strain signals of the expansion joint and transmit the displacement signals and the strain signals to the computer system, and the real-time state of the displacement sensor and the real-time state of the strain sensor are obtained through analysis of the computer system;
and S3, monitoring the real-time state of the expansion joint according to the real-time state of the displacement sensor and the real-time state of the strain sensor, and issuing real-time display by a display.
2. The on-line monitoring and early warning method of a metal expansion joint according to claim 1, wherein in S1, a displacement sensor is installed on a pull rod of the expansion joint; the strain sensor is arranged on the corrugated pipe at the middle position of the expansion joint.
3. The metal according to claim 1The expansion joint on-line monitoring and early warning method is characterized in that in S2, the real-time state analysis process of the displacement sensor is as follows: calibrating the displacement L of the expansion joint when not working Label (C) The displacement stroke L1 under the rated working condition and the displacement stroke S of the expansion joint during working, wherein '(+ -)' represents the displacement direction of the expansion joint, the expansion joint is compressed to 'plus', the expansion is stretched to 'minus', and when L=L Label (C) When the expansion joint is not in operation, L is the displacement stroke of the expansion joint:
when L1 is between L+/-S, the displacement sensor is in a normal state, and the displacement sensor displays normal;
when L1 is smaller than L-S or L1 is larger than L+S, the displacement sensor is in an early warning state and sends out a displacement early warning signal.
4. The method for on-line monitoring and early warning of a metal expansion joint according to claim 3, wherein in S2, the real-time state of the displacement sensor is analyzed as follows: calibrating the displacement L of the expansion joint when not working Label (C) The displacement stroke L1 under the rated working condition and the displacement stroke S during working, wherein '(+ -)' represents the displacement direction of the expansion joint, the expansion joint is compressed to 'plus', the extension is 'minus', and when L is not equal to L Label (C) When first correcting l=l Label (C) According to L=L Label (C) The state of the displacement sensor is analyzed.
5. The method for on-line monitoring and early warning of metal expansion joint according to claim 4, wherein during the correction, L is used for the purpose of Label (C) Obtaining displacement deviation + -delta L with L, wherein "±" represents the displacement direction of the expansion joint, the expansion joint is compressed to "+" and the elongation is "-"; the displacement deviation + -DeltaL is then eliminated by adjusting the mounting position of the expansion joint when not in operation such that L=L Label (C) 。
6. The method for on-line monitoring and early warning of a metal expansion joint according to claim 5, wherein in S2, the real-time state of the strain sensor is analyzed as follows: setting the rated load of the strain sensor as sigma Forehead (forehead) When the expansion joint worksIs sigma;
when sigma is equal to or greater than sigma Forehead (forehead) When the strain sensor is in an early warning state, and a strain early warning signal is sent out;
when sigma is smaller than sigma Forehead (forehead) When the strain sensor is in a normal state.
7. The on-line monitoring and early warning method of a metal expansion joint according to claim 6, wherein in S3, the real-time state of the expansion joint is divided into a normal state, an early warning state and an abnormal state according to the real-time state of the displacement sensor and the real-time state of the strain sensor;
when the strain sensor and the displacement sensor are in a normal state, the expansion joint is in a normal state;
when the displacement sensor or the strain sensor is in an early warning state, the expansion joint is in an early warning state;
when the displacement sensor and the strain sensor are both in an early warning state, the expansion joint is in an abnormal state.
8. The on-line monitoring and early warning system for the stress deformation of the metal expansion joint is characterized by comprising a data acquisition module, an analysis module and a data output module, wherein the data acquisition module is used for acquiring real-time data of the expansion joint, the analysis module is used for calculating the real-time data, and the data output module is used for outputting the real-time state of the expansion joint.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and running on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-7 when the computer program is executed by the processor.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310890463.9A CN116972791A (en) | 2023-07-19 | 2023-07-19 | Online monitoring and early warning method, system, medium and storage setting for metal expansion joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310890463.9A CN116972791A (en) | 2023-07-19 | 2023-07-19 | Online monitoring and early warning method, system, medium and storage setting for metal expansion joint |
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| CN116972791A true CN116972791A (en) | 2023-10-31 |
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| CN202310890463.9A Pending CN116972791A (en) | 2023-07-19 | 2023-07-19 | Online monitoring and early warning method, system, medium and storage setting for metal expansion joint |
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| CN (1) | CN116972791A (en) |
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- 2023-07-19 CN CN202310890463.9A patent/CN116972791A/en active Pending
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