CN112304236A - On-line monitoring device for high-strength bolt tightness - Google Patents
On-line monitoring device for high-strength bolt tightness Download PDFInfo
- Publication number
- CN112304236A CN112304236A CN202011315596.6A CN202011315596A CN112304236A CN 112304236 A CN112304236 A CN 112304236A CN 202011315596 A CN202011315596 A CN 202011315596A CN 112304236 A CN112304236 A CN 112304236A
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- China
- Prior art keywords
- bolt
- strain sensor
- signal
- tightness
- monitoring device
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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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
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
Abstract
The invention discloses an online monitoring device for the tightness of a high-strength bolt, and belongs to the field of online monitoring. The bolt comprises a bolt, wherein a tubular strain sensor is fixedly arranged in the bolt, a signal transmission line of the tubular strain sensor extends out of the bolt, the signal transmission line is connected with a signal acquisition and processing module, and the signal acquisition and processing module is connected with a single-chip Microcomputer (MCU); the signal acquisition processing module is used for receiving and processing signals of the tubular strain sensor and sending the signals to the MCU; the MCU is used for comparing the received signal with a set value, and sending an alarm signal when the received signal deviates from the preset range of the set value. The invention has simple structure and high generalization degree, can meet the use requirements of various industrial fastening scenes and reasonably evaluate and arrange operation and maintenance work.
Description
Technical Field
The invention belongs to the field of online detection, and particularly relates to an online monitoring device for the tightness of a high-strength bolt.
Background
In industrial scenes such as operation of mechanical equipment and the like, high-strength bolts are often used for fixing, for example, bolts for the top cover of a hydroelectric generating set in a hydropower station are fixed. Once bolt loosening or fatigue fracture occurs, there is a possibility of a significant safety accident due to the roof being pushed open under high water pressure. If the bolt of the tower barrel of the wind generating set is loosened or subjected to fatigue fracture, serious accidents such as tower falling and the like can be caused. Therefore, the online monitoring of the high-strength bolt fastening condition is significant.
Disclosure of Invention
The invention aims to overcome the defect that the fastening condition of a high-strength bolt is not monitored, and provides an on-line monitoring device for the fastening degree of the high-strength bolt.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an on-line monitoring device for the tightness of a high-strength bolt comprises a bolt, wherein a tubular strain sensor is fixedly arranged in the bolt, a signal transmission line of the tubular strain sensor extends out of the bolt, the signal transmission line positioned outside the bolt is connected with a signal acquisition and processing module, and the signal acquisition and processing module is connected with a single-chip Microcomputer (MCU);
the signal acquisition processing module is used for receiving signals of the tube-type strain sensor, converting the signals into digital signals and sending the digital signals to the MCU;
the MCU is used for comparing the received signal with a set value, and sending an alarm signal when the received signal deviates from the preset range of the set value.
Furthermore, a hexagonal flange is arranged at one end of the bolt, a mounting hole is formed in the bolt close to the hexagonal flange, and threads are arranged in the mounting hole;
the shell of the tubular strain sensor is provided with threads, the tubular strain sensor is arranged in the mounting hole in a threaded fit mode, and the signal transmission line extends out of the bolt through the hexagonal flange.
Furthermore, weather-resistant glue for sealing is arranged in the mounting hole.
Furthermore, the periphery of the screw rod of the bolt is provided with threads.
Further, the pipe-shaped strain sensor and the bolt are welded into a whole.
Furthermore, the tubular strain sensor is a fiber grating strain sensor, and the corresponding signal acquisition processing module has a photoelectric conversion function.
Furthermore, the tubular strain sensor is a resistance strain sensor, and the corresponding signal acquisition and processing module has an A/D conversion function.
Further, a fastener is arranged outside the bolt;
when the fastening force of the bolt reaches a preset torque, the output signal of the tubular strain sensor corresponds to the normal elongation of the bolt;
along with the alternating action of mechanical motion, vibration and temperature change, the tightness of the bolt is reduced, and the output signal of the tubular strain sensor is reduced along with the reduction;
and when the output signal of the tubular strain sensor deviates from the preset range of the signal of the normal elongation of the bolt, an alarm signal is sent out.
Compared with the prior art, the invention has the following beneficial effects:
according to the on-line monitoring device for the high-strength bolt tightness, the fastening state of the bolt is monitored in real time by arranging the tubular strain sensor, and an alarm signal is sent out when the fastening state is larger than a preset range, so that the fastening state of the bolt can be actively provided to avoid safety accidents. The invention has simple structure and high generalization degree, can meet the use requirements of various industrial fastening scenes and reasonably evaluate and arrange operation and maintenance work.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the bolt of the present invention when mounted on a flange;
fig. 3 is a schematic diagram of an expanded structure of the present invention.
Wherein: 1-a bolt; 2-tube type strain sensors; 101-hexagonal flange; 102-a screw; 3-weather-resistant glue; 4-signal transmission line.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, fig. 1 is a schematic structural diagram of the present invention, and an on-line monitoring device for high-strength bolt tightness includes a bolt 1, a tubular strain sensor 2, a signal acquisition processing module, and a single chip microcomputer. A hexagonal flange 101 is arranged at one end of the bolt 1, a mounting hole is formed in the bolt 1 close to the hexagonal flange 101, threads are arranged in the mounting hole, and threads are arranged on the periphery of the screw 102; the shell of the tubular strain sensor 2 is provided with threads; the tubular strain sensor 2 is installed in the bolt 1 through screwing, the tubular strain sensor 2 and the bolt 1 are reliably connected into a whole through welding, and weather-resistant glue 3 is sealed in the installation hole; a signal transmission line 4 of the tubular strain sensor 2 extends out of the bolt 1 through a hexagonal flange 101, the other end of the signal transmission line 4 is connected with a signal acquisition and processing module, and the signal acquisition and processing module processes a strain sensor signal and transmits the strain sensor signal to a single-chip microcomputer MCU; the single chip microcomputer MCU has a comparison function and is used for comparing the received signal of the tubular strain sensor 2 with a set value and sending an alarm signal when the received signal deviates from the preset range of the set value.
When the tubular strain sensor 2 is a fiber grating strain sensor, the tubular strain sensor 2 outputs an optical signal, and the adopted signal acquisition processing module has a photoelectric conversion function; when the tube-type strain sensor 2 is a strain sensor based on the resistance strain gauge principle, the tube-type strain sensor 2 outputs a voltage signal, and the adopted signal acquisition and processing module has an A/D conversion function.
Referring to fig. 2, fig. 2 is a schematic view showing a structure of the bolt of the present invention when the bolt 1 installed in the pipe type strain sensor 2 is installed on a fastening member such as a flange, and the fastening member is fastened by applying a rated torque. At this time, the bolt 1 is stressed to be elongated, when the fastening force of the bolt 1 reaches the preset moment, as an initial stage, at this time, the signal of the tubular strain sensor 2 is the elongation for fastening a normal bolt. Along with the alternating action of mechanical motion, vibration, temperature change and the like, the tightness of the bolt 1 is gradually reduced, and the output signal value of the tubular strain sensor 2 is also gradually reduced; and when the strain signal deviates from the preset range of the elongation signal of the fastening normal bolt, sending an alarm prompt.
Referring to fig. 3, fig. 3 is a schematic structural diagram of the high-strength bolt tightness on-line detection device after expansion, and the high-strength bolt tightness on-line detection device can be further expanded into an on-line detection system. The on-line monitoring system adopts a bus structure and is divided into three layers: the system comprises a field detection layer, a communication management layer and a background data analysis layer. The on-site detection layer has a signal acquisition and processing function, transmits a detected strain value to a communication management machine of the communication management layer in real time through a network, and transmits stress information to the background data analysis layer of the central control room through an optical fiber according to a standard protocol. The background data analysis layer realizes the storage and analysis of each point data to be monitored, adopts methods such as contrastive analysis, trend analysis and D-S evidence reasoning to realize the comprehensive judgment of the bolt fastening condition and the loosening degree, and provides the comprehensive judgment for operation and maintenance personnel to realize the state maintenance.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. The on-line monitoring device for the tightness of the high-strength bolt comprises a bolt (1), wherein a tubular strain sensor (2) is fixedly arranged in the bolt (1), a signal transmission line (4) of the tubular strain sensor (2) extends out of the bolt (1), the signal transmission line (4) positioned outside the bolt (1) is connected with a signal acquisition and processing module, and the signal acquisition and processing module is connected with a single-chip microcomputer MCU (microprogrammed control unit);
the signal acquisition processing module is used for receiving signals of the tube-type strain sensor (2), converting the signals into digital signals and sending the digital signals to the MCU;
the MCU is used for comparing the received signal with a set value, and sending an alarm signal when the received signal deviates from the preset range of the set value.
2. The on-line monitoring device for the tightness of the high-strength bolt according to claim 1, characterized in that a hexagonal flange (101) is arranged at one end of the bolt (1), a mounting hole is formed in the bolt (1) close to the hexagonal flange (101), and a thread is arranged in the mounting hole;
be equipped with the screw thread on the shell of cast strain sensor (2), cast strain sensor (2) are established in the mounting hole through the screw-thread fit, signal transmission line (4) extend to outside bolt (1) through hexagonal flange (101).
3. The on-line monitoring device for the tightness of a high-strength bolt according to claim 2, characterized in that a weather-resistant glue (3) for sealing is provided in the mounting hole.
4. An on-line monitoring device for the tightness of high-strength bolts according to claim 1, 2 or 3, characterized in that the bolt (1) is provided with threads on the periphery of the screw (102).
5. The high-strength bolt tightness on-line monitoring device according to claim 4, wherein the tubular strain sensor (2) is welded with the bolt (1) as a whole.
6. The on-line monitoring device for the tightness of the high-strength bolt according to claim 1, wherein the tubular strain sensor (2) is a fiber grating strain sensor, and a corresponding signal acquisition and processing module has a photoelectric conversion function.
7. The high-strength bolt tightness on-line monitoring device according to claim 1, wherein the tubular strain sensor (2) is a resistance strain type strain sensor, and the corresponding signal acquisition and processing module has an A/D conversion function.
8. The on-line monitoring device of the tightness of the high-strength bolt according to claim 1, characterized in that a fastener is provided outside the bolt (1);
when the fastening force of the bolt (1) reaches a preset torque, at the moment, the tubular strain sensor (2) outputs a signal corresponding to the normal elongation of the bolt (1);
along with the alternating action of mechanical movement, vibration and temperature change, the tightness of the bolt (1) is reduced, and the output signal of the tubular strain sensor (2) is reduced;
when the output signal of the tubular strain sensor (2) deviates from the preset range of the signal of the normal elongation of the bolt (1), an alarm signal is sent out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315596.6A CN112304236A (en) | 2020-11-21 | 2020-11-21 | On-line monitoring device for high-strength bolt tightness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315596.6A CN112304236A (en) | 2020-11-21 | 2020-11-21 | On-line monitoring device for high-strength bolt tightness |
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| Publication Number | Publication Date |
|---|---|
| CN112304236A true CN112304236A (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011315596.6A Pending CN112304236A (en) | 2020-11-21 | 2020-11-21 | On-line monitoring device for high-strength bolt tightness |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029420A (en) * | 2021-03-05 | 2021-06-25 | 上海理工大学 | Embedded wireless passive bolt tightness state monitoring system based on surface acoustic wave technology |
| CN114061819A (en) * | 2021-10-20 | 2022-02-18 | 广州建筑股份有限公司 | Scaffold fastener tightening torque monitoring device |
| CN114318415A (en) * | 2022-01-11 | 2022-04-12 | 青岛双瑞海洋环境工程股份有限公司 | Anti-dismantling early warning system and method for electrolytic cell |
-
2020
- 2020-11-21 CN CN202011315596.6A patent/CN112304236A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029420A (en) * | 2021-03-05 | 2021-06-25 | 上海理工大学 | Embedded wireless passive bolt tightness state monitoring system based on surface acoustic wave technology |
| CN114061819A (en) * | 2021-10-20 | 2022-02-18 | 广州建筑股份有限公司 | Scaffold fastener tightening torque monitoring device |
| CN114318415A (en) * | 2022-01-11 | 2022-04-12 | 青岛双瑞海洋环境工程股份有限公司 | Anti-dismantling early warning system and method for electrolytic cell |
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