CN111341075B - Alarm system and alarm method for looseness of bolts of wind turbine tower - Google Patents
Alarm system and alarm method for looseness of bolts of wind turbine tower Download PDFInfo
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- CN111341075B CN111341075B CN202010152035.2A CN202010152035A CN111341075B CN 111341075 B CN111341075 B CN 111341075B CN 202010152035 A CN202010152035 A CN 202010152035A CN 111341075 B CN111341075 B CN 111341075B
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- 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
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Abstract
The invention belongs to the technical field of real-time detection of bolt looseness, and discloses an alarm system and an alarm method for the bolt looseness of a wind turbine tower, wherein a magnet attached to a magnet is disconnected by displacement generated by the bolt looseness, and a signal is converted into resistance change under the action of a switch; the loosening quantity and position of the bolt can be obtained through collection, transmission and analysis of the resistance signal. According to the invention, through the vertical displacement change generated by loosening, the magnet bolt magnetically attached to the bottom end of the bolt is separated under the action of the insulating column force, the magnet falls off, the closed switch is disconnected under the action of the connecting rope, the loosening quantity of the bolt is monitored through the change of the resistance in the monitoring circuit, and the bolts are grouped, so that the loosening position is judged, the monitoring range is reduced, and the bolt can be more accurately and specifically overhauled. The invention can judge the number and the position of the bolt looseness and has great help to the development and the perfection of the tower state monitoring system.
Description
Technical Field
The invention belongs to the technical field of real-time detection of bolt looseness, and particularly relates to an alarm system and an alarm method for bolt looseness of a wind turbine tower.
Background
At present, in recent years, the environment is gradually deteriorated and the reserves of fossil energy are reduced, and new energy is increasingly paid attention and developed by countries around the world. Wind power is used as clean energy with mature technical development, and the installed capacity of the whole world is rapidly increased. Because the working mode of the wind driven generator is complex, and the tower barrel of the wind driven generator bears the aerodynamic load of various natural winds and the gravity load of the engine room and the wind wheel, the safety of the wind driven generator is extremely important, and once the wind driven generator fails, huge loss can be caused. The flange and the bolt are used as main connection modes of the tower barrel, the safety of the tower barrel is extraordinarily important, corresponding safety levels and early warning signals can be judged through monitoring and data analysis of the tower barrel, and corresponding maintenance measures can be taken in time to avoid loss.
Therefore, an alarm device and an alarm system capable of monitoring the loosening of the bolts of the fan tower in real time need to be invented. However, due to the fact that the number of bolts at the flange of the wind turbine tower is large, how to more effectively monitor the number and the positions of bolt looseness is a current problem.
Through the above analysis, the problems and defects of the prior art are as follows: (1) in the prior art, the quantity of bolt looseness is not monitored by the change of resistance in a monitoring circuit caused by the separation of a magnet magnetically attached to the bottom end of the bolt and the bolt, and meanwhile, the position for judging the looseness is not accurately monitored. Making the maintenance process difficult.
(2) The maintenance aiming at the looseness of the tower bolt is periodical maintenance, and the maintenance is not targeted, so that the workload is large, and time and labor are wasted. At present, in the monitoring technology aiming at bolt looseness, bolts at flanges are monitored according to modes of vibration signals, strain signals and the like, but because a tower barrel is in an irregular vibration state, certain difficulty exists in processing signal interference and extracting characteristics, and after the bolts are tightened, the arrangement of restorability is difficult again.
The difficulty in solving the above problems and defects is: due to the fact that the number of bolts at the flange of the wind turbine tower is large, how to more effectively monitor the number and the positions of bolt looseness is a current problem.
After the bolt is overhauled, the bolt is tightened again, and how to monitor the bolt by simple operation again.
The significance of solving the problems and the defects is as follows: through the research to the device and monitoring system, can solve the validity and the accuracy of monitoring bolt looseness and have very big help, can reduce the emergence of accident, can purposefully simpler discovery problem position to the maintainer, the operation of accomplishing the monitoring again that can be simple after resumeing.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an alarm system and an alarm method for the looseness of a wind turbine tower bolt.
The invention is realized in this way, and an alarming method for the looseness of a bolt of a wind turbine tower comprises the following steps:
firstly, disconnecting a magnet attached to a magnet through displacement generated by loosening a bolt, and converting a signal into resistance change through the action of a switch;
and step two, acquiring, transmitting and analyzing the resistance signals to obtain the loosening quantity and position of the bolts.
Further, the alarm method for the looseness of the bolts of the wind turbine tower further comprises the following steps:
firstly, mounting an alarm device for bolt loosening;
secondly, displacement variation is generated through loosening of the nut, the nut pushes the insulating column downwards, the magnet block at the bottom end of the bolt is pushed down, the closing switch is driven to be switched off, and resistance signals are changed;
thirdly, the signals are decoded and sent to a bolt loosening monitoring system module by a signal receiving module through the acquisition of a signal acquisition module and the signal processing and transmission of a signal transmitting module;
and fourthly, after the bolt loosening monitoring system judges the signals, evaluating and classifying the safety state of the tower bolt, calling the maintenance scheme in the maintenance manual, and obtaining the position of the loosened bolt and the quantity of the loosened bolt.
Furthermore, in the first step, after the bolt is pre-tightened, the magnet block is adsorbed at the bottom of the bolt, the insulating column is arranged between the bolt and the magnet block, and then the connecting rope is connected with the closed switch in the alarm switch.
Furthermore, in the second step, through grouping the bolts, the switches in the same group are connected in series and connected with the signal acquisition module.
Further, after the fourth step, the following steps are carried out: and after the loosened bolt is pre-tightened again, the alarm device for the bolt loosening is arranged and placed again.
Another object of the present invention is to provide an alarm system for implementing the loosening of a bolt of a wind turbine tower, comprising:
the signal acquisition module is used for converting the resistance variable quantity in the alarm switches connected in series in groups into current or voltage signals to be acquired and transmitted to the signal transmitting module;
the signal transmitting module is used for carrying out coding processing and data sending on the signals acquired and transmitted by the signals;
the power supply module is used for supplying power to the signal acquisition module and the signal transmission module at the monitoring position of the tower flange bolt;
the signal receiving module is used for receiving and decoding the signals transmitted by the signal transmitting module;
and the bolt looseness monitoring system module is used for analyzing and processing the signals, judging the number and the general position of bolt looseness and monitoring in real time.
The invention also aims to provide an alarm device for implementing the loosening of the bolts of the wind turbine tower, which comprises an insulating column; the insulating column is used for transferring displacement between the bolt and the magnet, the bolt is loosened to generate downward displacement, downward acting force and displacement are generated on the magnet block, the magnet block is separated from the bolt, and the alarm switch is driven to be switched off after the magnet block falls;
the magnet block is used for transmitting the loosening displacement change of the bolt, is adsorbed to the bottom end of the bolt and is connected with the alarm switch through a connecting rope;
the connecting rope is used for connecting the magnet block and the switch, and transmitting the force of the falling magnet block to the alarm switch to disconnect the alarm switch;
the alarm switch is arranged on the lower portion of the upper flange and the lower flange and is formed by connecting a resistor and a switch in parallel, the magnet block is pushed down by displacement generated by loosening of the bolt, and then the switch with short circuit of the resistor is disconnected to generate variation of the resistor in a circuit.
Another object of the present invention is to provide a program storage medium for receiving user input, the stored computer program causing an electronic device to execute the method for alarming loosening of a wind turbine tower bolt.
Another object of the present invention is to provide a computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface to implement the wind turbine tower bolt loosening warning method when executed on an electronic device.
By combining all the technical schemes, the invention has the advantages and positive effects that:
according to the invention, through the vertical displacement change generated by loosening, the magnet bolt magnetically attached to the bottom end of the bolt is separated under the action of the insulating column force, the magnet falls off, the closed switch is disconnected under the action of the connecting rope, the loosening quantity of the bolt is monitored through the change of the resistance in the monitoring circuit, and the bolts are grouped, so that the loosening position is judged, the monitoring range is reduced, and the bolt can be more accurately and specifically overhauled.
The invention can judge the number and the position of the bolt looseness, has great help to the development and the perfection of the state monitoring system of the tower, and has the advantages of repeated use, simple structure, low cost and the like in practical application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
FIG. 1 is a flow chart of an alarm method for loosening a bolt of a wind turbine tower according to an embodiment of the invention.
Fig. 2 is a schematic layout and installation diagram of an alarm device provided by the embodiment of the invention.
In the figure: 1. a bolt; 2. an upper flange and a lower flange; 3. an insulating column; 4. an alarm switch; 5. connecting ropes; 6. and a magnet block.
Fig. 3 is a schematic diagram of an alarm switch according to an embodiment of the present invention.
Fig. 4 is a schematic connection diagram of a bolt number and signal acquisition module according to an embodiment of the present invention.
FIG. 5 is a schematic view of an alarm system for loosening a bolt of a wind turbine tower according to an embodiment of the invention.
In the figure: 7. a signal acquisition module; 8. a signal transmitting module; 9. a power supply module; 10. a signal receiving module; 11. bolt looseness monitoring system module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the prior art, the quantity of bolt looseness is not monitored by the change of resistance in a monitoring circuit caused by the separation of a magnet magnetically attached to the bottom end of the bolt and the bolt, and meanwhile, the position for judging the looseness is not accurately monitored. Making the maintenance process difficult.
Aiming at the problems in the prior art, the invention provides an alarm system and an alarm method for the looseness of a wind turbine tower bolt, and the invention is described in detail below with reference to the attached drawings.
As shown in FIG. 1, the alarm method for the looseness of the bolt of the wind turbine tower provided by the invention comprises the following steps:
s101, firstly, the alarm device for bolt looseness is installed, as shown in figure 2, after the bolt is pre-tightened, the magnet block is adsorbed at the bottom of the bolt, the insulating column is placed between the bolt and the magnet block, and then the connecting rope is connected with the closed switch in the alarm switch.
S102, displacement variation is generated through loosening of the bolts, the magnet block at the bottom end of the bolts is jacked down to drive the closed switch to be disconnected, the circuit schematic diagram of the alarm switch is shown in fig. 3, accordingly, resistance signals are changed, in addition, the bolts are grouped, and the switches in the same group are connected in series and connected with the signal acquisition module, and the signal acquisition module is shown in fig. 4.
And S103, decoding and sending the signals to a bolt looseness monitoring system by the signal receiving module through the acquisition of the signal acquisition module and the signal processing and transmission of the signal transmitting module. The connection of the various modules is shown in figure 5.
And S104, after the bolt looseness monitoring system judges the signals, evaluating and classifying the safety state of the tower bolt, calling the maintenance scheme in the maintenance manual, and obtaining the specific maintenance position and the bolt looseness number.
And S105, after the loosened bolt is pre-tightened again, arranging and placing the alarm device again as shown in FIG. 2.
As shown in FIG. 2, the invention provides an alarm device for the looseness of a wind turbine tower bolt, which comprises a bolt 1, an upper flange 2, a lower flange 2, an insulating column 3, an alarm switch 4, a connecting rope 5 and a magnet block 6.
Insulating column 3, mainly be responsible for the transmission to the displacement between bolt and the magnet, when the not hard up decurrent displacement volume of production of bolt 1, insulating column 3 can produce decurrent effort and displacement to magnet piece 6, with the separation of magnet piece 6 and bolt, because the increase magnetic force in displacement clearance can be less than the gravity of magnet piece, magnet piece 6 drops, drives alarm switch 4's disconnection.
The magnet block 6 is used for transferring bolt loosening displacement change, is adsorbed to the bottom end of the bolt and is connected with the alarm switch 4 through a connecting rope.
The connecting rope 5 is used for connecting the magnet block and the switch, and transmits the force of the falling magnet block to the alarm switch 4 to be disconnected.
The alarm switch 4 is arranged on the lower part of the upper flange 2 and the lower flange 2 and mainly formed by connecting a resistor and a switch in parallel, the magnet block is pushed down by displacement generated by loosening of the bolt 1, and then the switch with short circuit of the resistor is disconnected, so that the variation of the resistor in the circuit is generated. The upper and lower flanges 2 are installed between the bolts 1 and the insulating columns 3.
In the present invention, fig. 3 is a schematic diagram of an alarm switch according to an embodiment of the present invention.
In the present invention, fig. 4 is a schematic connection diagram of a bolt number and signal acquisition module according to an embodiment of the present invention.
In the invention, fig. 5 is a diagram illustrating an alarm system for loosening a bolt of a wind turbine tower according to an embodiment of the invention, and the alarm system includes a signal acquisition module 7, a signal transmission module 8, a power supply module 9, a signal receiving module 10, and a bolt monitoring system module 11.
The signal acquisition module 7 is mainly used for converting the resistance variable quantity in the alarm switches connected in series in groups into current or voltage signals to be acquired and transmitted to the signal transmitting module.
The signal transmitting module 8 is mainly used for coding the signal acquired and transmitted and sending data.
The power supply module 9 is mainly used for supplying power to the signal acquisition module and the signal transmission module at the monitoring position of the tower flange bolt.
The signal receiving module 10 is mainly used for receiving and decoding the signal transmitted by the signal transmitting module.
The bolt looseness monitoring system module 11 mainly analyzes and processes signals, judges the number and the general position of bolt looseness, and has a real-time monitoring function.
In the invention, the bolt loosening alarm device comprises the following steps:
firstly, the bolt is tightened according to the standard, the magnet block is adsorbed at the bottom end of the bolt, the insulating column is arranged between the bolt and the magnet block, a switch in the alarm switch is closed, the alarm switch is connected with the magnet block through a connecting rope, then the alarm switch of the grouped bolt is connected in series to the signal acquisition module, the signal module is connected with the signal generation module, and the power supply module supplies power to the two modules. And finally, connecting and debugging the signal receiving module and the bolt looseness monitoring module.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary hardware platform, and may also be implemented by hardware entirely. With this understanding in mind, all or part of the technical solutions of the present invention that contribute to the background can be embodied in the form of a software product, which can be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments or some parts of the embodiments of the present invention.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The method for alarming the bolt looseness at the flange of the wind turbine tower is characterized by comprising the following steps of:
firstly, disconnecting a magnet attached to a magnet through displacement generated by loosening a bolt, and converting a signal into resistance change through the action of a switch;
acquiring, transmitting and analyzing resistance signals to obtain the loosening quantity and position of the bolts;
the alarm method for the looseness of the bolts of the wind turbine tower further comprises the following steps:
firstly, mounting an alarm device for bolt loosening;
secondly, displacement variation is generated through loosening of the bolt, the magnet block at the bottom end of the bolt is pushed down and falls off, the closing switch is driven to be switched off, and resistance signals are changed;
thirdly, the signals are decoded and sent to a bolt loosening monitoring system module by a signal receiving module through the acquisition of a signal acquisition module and the signal processing and transmission of a signal transmitting module;
fourthly, after the bolt loosening monitoring system judges the signals, the safety states of the tower bolts are evaluated and classified, and the maintenance scheme in the maintenance manual is called to obtain the positions of the loosened bolts and the quantity of the loosened bolts;
in the first step, after the bolt is pre-tightened, the magnet block is adsorbed at the bottom of the bolt due to magnetic force, the insulating column is arranged between the bolt and the magnet block, and then the connecting rope is connected with the closed switch in the alarm switch;
in the second step, the bolts are grouped, and the switches in the same group are connected in series and connected with the signal acquisition module;
after the fourth step, the following steps are carried out: and after the loosened bolt is pre-tightened again, the alarm device for the bolt loosening is arranged and placed again.
2. A wind turbine tower bolt looseness alarm system for implementing the wind turbine tower bolt looseness alarm method of claim 1, wherein the wind turbine tower bolt looseness alarm system comprises:
the signal acquisition module is used for converting the resistance variable quantity in the alarm switches connected in series in groups into current or voltage signals to be acquired and transmitted to the signal transmitting module;
the signal transmitting module is used for carrying out coding processing and data sending on the signals acquired and transmitted by the signals;
the power supply module is used for supplying power to the signal acquisition module and the signal transmission module at the monitoring position of the tower flange bolt;
the signal receiving module is used for receiving and decoding the signals transmitted by the signal transmitting module;
and the bolt looseness monitoring system module is used for analyzing and processing the signals, judging the number and the general position of bolt looseness and monitoring in real time.
3. The wind turbine tower bolt looseness alarm device for implementing the wind turbine tower bolt looseness alarm method of claim 1, wherein the wind turbine tower bolt looseness alarm device comprises an insulating column; the insulating column is used for transferring displacement between the bolt and the magnet, the bolt is loosened to generate downward displacement, downward acting force and displacement are generated on the magnet block, the magnet block is separated from the bolt, and the alarm switch is driven to be switched off after the magnet block falls;
the magnet block is used for transmitting the loosening displacement change of the bolt, is adsorbed to the bottom end of the bolt and is connected with the alarm switch through a connecting rope;
the connecting rope is used for connecting the magnet block and the switch, and transmitting the force of the falling magnet block to the alarm switch to disconnect the alarm switch;
the alarm switch is arranged on the lower portion of the upper flange and the lower flange and is formed by connecting a resistor and a switch in parallel, the magnet block is pushed down by displacement generated by loosening of the bolt, and then the switch with short circuit of the resistor is disconnected to generate variation of the resistor in a circuit.
4. A program storage medium for receiving user input, the stored computer program causing an electronic device to perform the method for alarming a bolt loosening of a tower of a wind turbine as recited in claim 1.
5. A computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface for implementing the method for alarming a loose bolt of a tower of a wind turbine as claimed in claim 1 when executed on an electronic device.
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| CN202010152035.2A CN111341075B (en) | 2020-03-06 | 2020-03-06 | Alarm system and alarm method for looseness of bolts of wind turbine tower |
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| CN202010152035.2A CN111341075B (en) | 2020-03-06 | 2020-03-06 | Alarm system and alarm method for looseness of bolts of wind turbine tower |
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| CN111341075B true CN111341075B (en) | 2021-11-16 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112990665A (en) * | 2021-02-23 | 2021-06-18 | 华中科技大学 | Alarm system, alarm method and alarm device for looseness of wind turbine tower bolt |
| CN113107181A (en) * | 2021-03-04 | 2021-07-13 | 安徽省标诺建筑科技有限公司 | Angle-adjustable diagonal I-shaped steel beam |
| CN113049168B (en) * | 2021-03-12 | 2022-12-09 | 北京英华达电力电子工程科技有限公司 | Fan mesh bolt pretightening force monitoring devices |
| CN114427929B (en) * | 2022-01-25 | 2023-06-06 | 华中科技大学 | Alarm method, system and terminal for monitoring looseness of wind turbine tower bolt |
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