CN113790884A - Monitoring system for flange connecting bolt state - Google Patents
Monitoring system for flange connecting bolt state Download PDFInfo
- Publication number
- CN113790884A CN113790884A CN202111146757.8A CN202111146757A CN113790884A CN 113790884 A CN113790884 A CN 113790884A CN 202111146757 A CN202111146757 A CN 202111146757A CN 113790884 A CN113790884 A CN 113790884A
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- bolt
- flange
- monitoring system
- acquisition unit
- wire
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 230000000694 effects Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention provides a monitoring system for the state of a flange connecting bolt, which comprises a data acquisition unit, an upper computer and a traction wire, wherein the traction wire is used for sequentially connecting a plurality of bolts which connect an upper flange and a lower flange in series; the data acquisition unit is used for acquiring the tension of the traction wire and transmitting the acquired tension to the upper computer; the upper computer is used for comparing the received tension force with a preset threshold value and judging whether to send out alarm information or not according to a comparison result; the invention can realize the monitoring and alarming of the loosening and the breakage of all bolts of the flange, and has good monitoring effect and strong reliability.
Description
Technical Field
The invention relates to the technical field of flange connecting bolt monitoring, in particular to a monitoring system for the state of a flange connecting bolt.
Background
The flange connection is a connection mode of a detachable structure formed by connecting a flange, a gasket and a bolt, and the flange connection is widely applied in the current wind power industry and plays an important role. The flange connecting structure of the tower barrel of the wind turbine generator is subjected to various alternating loads and impact loads in work. Under the alternating load of tension and compression, the screw thread may generate plastic deformation to cause the bolt to be loosened, and the bolt tension is reduced. The bolt tension is too small, so that the connection is unreliable, and the normal work of the machine is influenced. If the bolt tension is too large, the bolt can be broken under the action of load, so that the bearing capacity of the connecting joint is weakened, and structural instability can be caused in severe cases. Therefore, in order to ensure that the bolt tension is in a normal state, the moment wrench is used for checking the pretightening force of the bolt, which is an important content of regular maintenance.
When the product operation and maintenance is in remote areas, high places, at sea or other places inconvenient to maintain, the regular inspection operation and maintenance strategy of the bolt tension is generally performed once in half a year or a year. This work is wasted time and energy, and the personnel are subjective and objective many factors influence in the aspect in addition, can not guarantee to discover the unusual problem of bolt pulling force in time at every turn, so it is very necessary to carry out on-line monitoring to tower section of thick bamboo flange bolt pulling force.
Disclosure of Invention
The invention aims to provide a monitoring system for the state of a flange connecting bolt, which solves the defects in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a monitoring system for the state of a flange connecting bolt, which comprises a data acquisition unit, an upper computer and a traction wire, wherein the traction wire is used for sequentially connecting a plurality of bolts which connect an upper flange and a lower flange in series; the data acquisition unit is used for acquiring the tension of the traction wire and transmitting the acquired tension to the upper computer; the upper computer is used for comparing the received tension force with a preset threshold value and judging whether to send out alarm information according to a comparison result.
Preferably, the data acquisition unit comprises a switch device and an information acquisition unit, wherein the switch device is mounted at the end part of one end of the traction wire; the information acquisition unit is used for acquiring the state of the switching device and transmitting the acquired state to the upper computer.
Preferably, the switching devices are arranged in plurality and uniformly distributed on the traction line; each switch device is connected with an information acquisition unit; and the plurality of information acquisition units are all connected to the upper computer.
Preferably, each bolt is provided with a bolt buckle, and the bolt buckle is connected with the traction wire.
Preferably, the bolt buckle is a spring coil, and the spring coil is sleeved on a screw rod of the bolt; and the bolt buckle is provided with a wire passing hole for passing a traction wire.
Preferably, the two wire passing holes are formed in the two ends of the bolt buckle.
Preferably, the wire passing hole is of a buckle structure.
Preferably, the pull wires are provided with a plurality of pull wires which are uniformly distributed along the circumferential direction of the flange, and the bolts on the flange are sequentially connected in series.
Preferably, each traction line is provided with a data acquisition unit.
Compared with the prior art, the invention has the beneficial effects that:
the monitoring system for the flange connecting bolt state provided by the invention can realize monitoring and alarming on the loosening and fracture problems of all bolts of the flange, and has good monitoring effect and strong reliability.
Furthermore, the line passing hole of the bolt buckle is of a buckle structure, the traction line is convenient to install, the bolt is convenient and simple to replace after the bolt is broken, and the monitoring system is stable and reliable.
Furthermore, the bolt buckle is a spring coil, and can be directly screwed into a screw of the bolt during installation, so that the installation is convenient.
Furthermore, one or more segments of pull wires can be adopted according to the requirement of monitoring precision, and the number of the switching devices is selected to be proper.
Further, the bolts are connected in series and tightened through the bolt buckles and the traction lines, a switch device does not need to be arranged on each bolt, the number of the needed switch devices is small, the field installation is convenient, and the installation time and the cost are saved.
Drawings
FIG. 1 is a schematic view of the mounting of a pull wire and a bolt buckle according to the present invention;
FIG. 2 is a schematic view showing the installation of a flange joint bolt monitoring system according to embodiment 1;
FIG. 3a is a schematic view of a bolt fastener according to the present invention; wherein, the wire passing hole is of a circular ring structure;
FIG. 3b is a schematic view of another structure of the bolt fastener according to the present invention; wherein, the wire passing hole is of a buckle structure;
FIG. 4 is a schematic view showing the installation of a flange joint bolt monitoring system according to embodiment 2;
FIG. 5 is a schematic view showing the installation of a flange joint bolt monitoring system according to embodiment 3;
in the figure: 1-a switch device, 2-a bolt buckle, 21-a wire through hole, 3-a traction wire, 4-an upper flange, 5-a lower flange, 6-a bolt and 7-an information acquisition unit.
Detailed Description
The invention is further described with reference to the following figures and examples.
Example 1
According to the monitoring system for the bolt state of the flange connection provided by the embodiment, as shown in fig. 1 and fig. 2, the upper flange 4 and the lower flange 5 are connected by the bolts 6, the flange connection structure can be subjected to various loads in work, so that the bolts are broken or serious, and the monitoring system for the bolt state of the flange connection provided by the embodiment can be used for monitoring all bolts on the connection flange. The monitoring system comprises a switch device 1, a bolt buckle 2, a traction wire 3, an information acquisition unit 7 and an upper computer.
Wherein: the information acquisition unit 7 is provided with at least two ports compatible with the access of at least one switching device 1, the switching device 1 is connected with the information acquisition unit 7 through a signal line, and on-off state data of the switching device 1 is transmitted to the information acquisition unit 7.
The switch device 1 and the information acquisition unit 7 are both fixed on the flange or near the flange, wherein the switch device 1 is fixed on the flange or near the flange in a gluing mode, a magnetic connection mode or a fastener connection mode.
The information acquisition unit 7 is connected with the upper computer in a wired or wireless mode, so that the received state data of the switching device is transmitted to the upper computer.
The upper computer is provided with a monitoring program, the monitoring program stores and analyzes received data and achieves an alarm function, the alarm function is set in the monitoring program, and when the state of the switch device is changed from closed to open, the upper computer gives out an alarm and indicates the position of the switch device with the changed on-off state.
The bolt buckle 2 is provided with at least one wire passing hole 21, and the two ends of the bolt buckle are provided with the wire passing holes 21 in the embodiment, so that on one hand, when the bolt buckle 2 is screwed into a position, close to the nut, on the screw rod, the bolt buckle 2 is ensured to have the wire passing holes to form a circular ring as much as possible, and the penetration and the serial connection tensioning of a traction wire are facilitated; on the other hand, if one of the wire passing holes is damaged, the other wire passing hole can be reserved, and the structure of the bolt buckle is shown in fig. 3 a.
The thread passing hole 21 of the bolt buckle 2 can be arranged to be of a collar structure, as shown in fig. 3b, when the traction thread is installed in the thread passing hole of a common structure, the traction thread needs to pass through the thread passing holes in sequence, and if the bolt is broken and needs to be replaced, the traction thread needs to be installed again. But use buckle structure's cross line hole 21, only need open the buckle of crossing the line hole when the installation pull wire, detain the pull wire in cross the line downthehole can again, simple to operate, in addition, when taking place the bolt fracture and need changing the bolt, need not to install the pull wire again, be convenient for maintain and guarantee monitoring system's stability.
The bolt buckle 2 is located on the outer side of the nut and is close to the nut, the diameter of a spring wire of the bolt buckle 2 is smaller than the opening size of the thread teeth and is embedded into the thread, and the bolt buckle 2 is not prone to being separated after being screwed into the screw.
The material of the bolt buckle 2 can be metal or nonmetal, but it needs to have certain elasticity and smooth surface.
In this embodiment, monitoring system is provided with four pull wires 3, and pull wire 3 passes through the line hole and establishes ties the taut back with the bolt, and the both ends of pull wire 3 are fixed respectively on corresponding bolt buckle 2, and pull wire 3 is steel wire or non-metal wire.
When the bolt breaks or becomes loose seriously, the traction wire will generate a certain pulling force under the action of centrifugal force generated by the rotation of the bolt along with the flange or the gravity of the fallen part of the bolt, and the switch device 1 is changed from a connection state to a disconnection state under the action of the pulling force. The information acquisition unit 7 monitors the state change and transmits the state data to the upper computer, and the upper computer sends out an alarm and indicates the position of the switching device 1 with the state change.
Example 2
The flange joint bolt monitoring system provided in this embodiment has a structure similar to that of embodiment 1, except that one pull wire 3 is provided, one switching device 1 is provided, and the switching device 1 is provided at one end of the pull wire 3. The installation schematic diagram of the monitoring system of the present embodiment is shown in fig. 4. The monitoring accuracy of the flange connection bolt monitoring system provided by the embodiment is lower than that of the flange connection bolt monitoring system provided by the embodiment 1, but the quantity of pull wires and switch devices can be saved.
Example 3
The structure of the flange joint bolt monitoring system provided in this embodiment is substantially the same as that of embodiment 2, except that in this embodiment, in addition to one switching device 1 provided at one end of the traction wire 3, two switching devices 1 are provided at other positions of the traction wire 3, as shown in fig. 5. The monitoring precision of the flange connection bolt monitoring system provided by the embodiment is higher than that of the flange connection bolt monitoring system provided by the embodiment 2, all bolts are connected in series by using one traction wire, the traction wire does not need to be segmented, and the flange connection bolt monitoring system is convenient to install.
Claims (9)
1. A monitoring system for the state of a flange connecting bolt is characterized by comprising a data acquisition unit, an upper computer and a traction wire (3), wherein the traction wire (3) is used for sequentially connecting a plurality of bolts (6) which connect an upper flange and a lower flange in series; the data acquisition unit is used for acquiring the tension of the traction wire and transmitting the acquired tension to the upper computer; the upper computer is used for comparing the received tension force with a preset threshold value and judging whether to send out alarm information according to a comparison result.
2. The monitoring system for the condition of the flange connecting bolt according to claim 1, characterized in that the data acquisition unit comprises a switch device (1) and an information acquisition unit (7), wherein the switch device (1) is installed at the end of one end of the traction wire (3); the information acquisition unit (7) is used for acquiring the state of the switch device (1) and transmitting the acquired state to the upper computer.
3. The flange connecting bolt state monitoring system according to claim 2, wherein a plurality of switch devices (1) are provided, and the plurality of switch devices (1) are uniformly distributed on the traction wire (3); each switch device (1) is connected with an information acquisition unit (7); the plurality of information acquisition units (7) are all connected to the upper computer.
4. A flange joint bolt condition monitoring system according to claim 1, characterized in that each bolt (6) is provided with a bolt buckle (2), and the bolt buckles (2) are connected with the traction wires (3).
5. A flange connection bolt condition monitoring system according to claim 4, characterized in that the bolt buckle (2) is a spring coil which is sleeved on a screw rod of the bolt (6); the bolt buckle (2) is provided with a wire passing hole (21) for passing a traction wire.
6. The monitoring system for the condition of the flange connecting bolt according to claim 5, wherein two wire passing holes (21) are arranged, and the two wire passing holes (21) are arranged at two ends of the bolt buckle (2).
7. The monitoring system for the condition of the flange connecting bolt as recited in claim 5, wherein the wire passing hole (21) is a snap structure.
8. The monitoring system for the condition of the flange connecting bolts as claimed in claim 1, wherein a plurality of pulling wires (3) are provided, the pulling wires (3) are uniformly distributed along the circumferential direction of the flange, and the bolts (6) on the flange are sequentially connected in series.
9. A flange joint bolt condition monitoring system according to claim 8, characterized in that each traction wire (3) is provided with a data acquisition unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111146757.8A CN113790884A (en) | 2021-09-28 | 2021-09-28 | Monitoring system for flange connecting bolt state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111146757.8A CN113790884A (en) | 2021-09-28 | 2021-09-28 | Monitoring system for flange connecting bolt state |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113790884A true CN113790884A (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111146757.8A Pending CN113790884A (en) | 2021-09-28 | 2021-09-28 | Monitoring system for flange connecting bolt state |
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| Country | Link |
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| CN (1) | CN113790884A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016053479A (en) * | 2014-09-02 | 2016-04-14 | 株式会社共和電業 | Screw looseness monitoring system, screw removal monitoring system, and screw looseness or removal monitoring system |
| CN110231158A (en) * | 2019-07-05 | 2019-09-13 | 江苏轶一电力科技有限公司 | A kind of steel tower bolt looseness monitoring device |
| US10724857B1 (en) * | 2018-11-09 | 2020-07-28 | Smart Wires Inc. | Real-time bolt monitoring system |
| CN211954195U (en) * | 2020-06-05 | 2020-11-17 | 郑州爱因特电子科技有限公司 | Flange bolt looseness monitoring device |
| JP2021015041A (en) * | 2019-07-12 | 2021-02-12 | Ｊｆｅエンジニアリング株式会社 | Bolt inspection device, bolt inspection system, bolt inspection method, and program |
| CN214666706U (en) * | 2021-04-19 | 2021-11-09 | 陕西中科启航科技有限公司 | Flange connecting bolt monitoring system |
-
2021
- 2021-09-28 CN CN202111146757.8A patent/CN113790884A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016053479A (en) * | 2014-09-02 | 2016-04-14 | 株式会社共和電業 | Screw looseness monitoring system, screw removal monitoring system, and screw looseness or removal monitoring system |
| US10724857B1 (en) * | 2018-11-09 | 2020-07-28 | Smart Wires Inc. | Real-time bolt monitoring system |
| CN110231158A (en) * | 2019-07-05 | 2019-09-13 | 江苏轶一电力科技有限公司 | A kind of steel tower bolt looseness monitoring device |
| JP2021015041A (en) * | 2019-07-12 | 2021-02-12 | Ｊｆｅエンジニアリング株式会社 | Bolt inspection device, bolt inspection system, bolt inspection method, and program |
| CN211954195U (en) * | 2020-06-05 | 2020-11-17 | 郑州爱因特电子科技有限公司 | Flange bolt looseness monitoring device |
| CN214666706U (en) * | 2021-04-19 | 2021-11-09 | 陕西中科启航科技有限公司 | Flange connecting bolt monitoring system |
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Application publication date: 20211214 |
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| RJ01 | Rejection of invention patent application after publication |