Wind turbine unit bolt monitoring device based on enameled wire

Abstract

The utility model provides a wind turbine bolt monitoring device based on an enamelled wire, the bolt head of each bolt is fixedly provided with two hangers, the enamelled wire passes through the two hangers on the bolt head and is fixedly connected with the two hangers, and the enamelled wire connects all bolts on the same flange in series and then is connected to an on-off data monitoring acquisition unit. The on-off data monitoring and collecting unit is connected with the upper computer, when the bolt is loosened, the bolt head drives the enameled wire on the hanging lug to rotate synchronously, the enameled wire is stretched and fractured, and the on-off data monitoring and collecting unit monitors a conduction signal of the enameled wire and transmits the conduction signal to the upper computer. According to the device, all bolt heads on the same flange are connected in series through the varnished wires, and the conduction signals of the varnished wires are monitored, so that monitoring and early warning are carried out on the loosening and even fracture risk of the bolts, effective monitoring of the bolts is realized, the loosening or fracture problem of all the bolts on the same flange can be monitored at a time, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine bolt monitoring, in particular to a wind turbine bolt monitoring device based on enameled wire, which performs online monitoring on bolts of wind turbine blade roots, towers and the like. Background Art

[0002] The wind power industry has developed rapidly, and the number of stock wind turbines has increased year by year. While providing the society with considerable green energy every year, there are also frequent safety accidents in wind farm operations. Among various wind farm safety accidents, accidents such as tower collapse and blade falling caused by loose and broken bolts have the characteristics of large economic losses and high risk of casualties, and the negative impact is particularly prominent. Therefore, online monitoring of the status of wind turbine blade root bolts and tower bolts has become a necessary means to timely identify problems such as loose and broken bolts, provide decision-making basis for precise operation and maintenance of wind turbines, reduce the probability of serious accidents, and ensure the safe operation of wind turbines.

[0003] In the existing technical solutions for wind turbines, there is a method of monitoring the looseness of bolts by monitoring nuts, that is, using a rotational displacement sensor to monitor the distance of the nut's loose rotation, and then converting the distance into an angle to calculate the looseness of the nut. However, this solution is difficult to implement and will affect the normal torque maintenance of the bolts. There is also a method of monitoring the looseness of bolts by monitoring the early warning force, which can monitor tower bolts and blade root bolts, etc., but this technology still has adaptability problems in engineering applications and has not been widely used. It cannot be well matched and adapted to special bolts and special working conditions. There is also a method of monitoring the looseness of bolts by monitoring the flange gap. This method is to monitor whether the bolts are loose by monitoring the size of the flange gap. This solution can use a single sensor to monitor about 6 bolts, and does not affect the construction and maintenance of the bolts. It is the most convenient and effective application at this stage. However, when using this solution to monitor tower bolts, problems can often be discovered only after multiple bolts are loose or loose to a certain extent, and it is not possible to accurately warn of bolt loosening. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a wind turbine bolt monitoring device based on enameled wire. The device connects all bolt heads on the same flange in series through the enameled wire, and monitors the conduction signal of the enameled wire, thereby monitoring and warning of the risk of loosening or even breakage of the bolts, thereby achieving effective monitoring of the bolts and monitoring the loosening or breakage of all bolts on the same flange at one time with low cost.

[0005] The technical solution adopted to achieve the above-mentioned purpose of the utility model is:

[0006] A wind turbine bolt monitoring device based on enameled wire at least includes enameled wire and an on-off data monitoring and acquisition unit, wherein two hanging ears are fixedly arranged on the bolt head of the bolt, the enameled wire passes through the two hanging ears on the bolt head and is fixedly connected to the two hanging ears, and the enameled wire connects all the bolts on the same flange in series and then is connected to the on-off data monitoring and acquisition unit, the on-off data monitoring and acquisition unit is connected to a host computer, when the bolt is loosened, the bolt head drives the enameled wire on the hanging ear to rotate synchronously, the enameled wire is stretched and broken, and the on-off data monitoring and acquisition unit monitors the conduction signal of the enameled wire and transmits the conduction signal to the host computer.

[0007] The bolt heads of the bolts are fixedly connected with a cover plate, and the two hanging ears are fixedly arranged on the cover plate.

[0008] The cover plate is a magnetic cover plate, which is fixed on the bolt head by magnetic adsorption.

[0009] The cover plate is fixed at the center position of the bolt head.

[0010] The connecting line between the two hanging ears passes through the center point of the bolt head, and the two hanging ears are close to the edge of the bolt head.

[0011] The fixing direction of the enameled wire on the bolt head via the two hanging ears is the direction in which the enameled wire will be stretched when the bolt is loosened.

[0012] The length of the enameled wire between two adjacent bolts is the same and is not tightened.

[0013] The actual length of the enameled wire between two adjacent bolts minus the length of the enameled wire between two adjacent bolts when tightened is the reserved amount of the enameled wire. The reserved amount of the enameled wire is adjusted according to the size of the bolt, the distance between the two hanging ears, and the bolt loosening warning value.

[0014] The enameled wire is wound around the hanging ear and fixed by gluing.

[0015] The host computer is provided with an alarm module, and when the host computer receives a conduction signal loss, the alarm module sends out an alarm.

[0016] Compared with the prior art, the beneficial effects of the wind turbine bolt monitoring device based on enameled wire provided by the utility model are as follows: 1. The wind turbine bolt monitoring device based on enameled wire provided by the utility model connects all bolt heads on the same flange in series through enameled wire, and monitors the conduction signal of the enameled wire through the on-off data monitoring and acquisition unit, warns of the risk of bolt loosening or even breaking, and performs timely maintenance, thereby realizing effective monitoring of the bolts, and any bolt on the same flange that is loose can be monitored, and the loosening or breaking problems of all bolts on the same flange can be monitored at one time, with low cost. 2. The hanging ears in the utility model are all arranged on the cover plate, and the cover plate is a magnetic cover plate, which is attracted to the bolt head by a strong magnetic magnet, and the cover plate is easy to disassemble, which is convenient for on-site maintenance of the bolt torque. 3. Two hanging ears are arranged in the utility model, and the two hanging ears are close to the edge of the bolt head, so that the distance between the two hanging ears is as large as possible, so that when the bolt is loose, the enameled wire rotates with the bolt head with a larger amplitude, the enameled wire is easier to be stretched, and the loosening of the bolt is easier to be monitored, and the bolt monitoring accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the installation of a wind turbine bolt monitoring device based on enameled wire provided by the utility model;

[0018] Figure 2 It is a schematic diagram of the connection between the hanging ear, the cover plate and the bolt head in the utility model;

[0019] In the figure: 1-bolt, 2-enameled wire, 3-hanging ear, 4-cover plate, 5-flange. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] The blade root, tower and other positions of the wind turbine are fixed by flanges and bolts 1 installed on the flanges 5. In this embodiment, the bolts at the flange connection on the wind turbine are monitored by a wind turbine bolt monitoring device based on enameled wire.

[0022] The installation diagram of the wind turbine bolt monitoring device based on enameled wire provided in this embodiment is as follows: Figure 1 As shown, it includes an enameled wire 2, a continuity data monitoring and acquisition unit and a host computer.

[0023] In this embodiment, two hanging ears 3 are fixedly arranged on the bolt head of each bolt. Preferably, a cover plate 4 is fixedly connected to the bolt head of each bolt, and the two hanging ears are fixedly arranged on the cover plate. Figure 2Furthermore, the cover plate is a magnetic cover plate, which is made of a strong magnet and is fixed to the bolt head by magnetic adsorption. When the fan is subjected to bolt maintenance and torque, it can be easily disassembled, which is convenient for maintenance personnel to inspect and repair.

[0024] The enameled wire passes through two hanging ears on the bolt head and is fixedly connected to the two hanging ears. Specifically, the enameled wire is wound around the hanging ears and fixed with glue. The enameled wire connects all the bolts on the same flange in series and then is connected to the on-off data monitoring and acquisition unit. That is, after the enameled wire is connected in series for one circle, both ends of the enameled wire are connected to the on-off data monitoring and acquisition unit to achieve electrical conduction. If the enameled wire is not disconnected, the on-off data monitoring and acquisition unit detects a conduction signal. If the enameled wire is disconnected, the on-off data monitoring and acquisition unit detects that the conduction signal is lost.

[0025] In this embodiment, the length of the enameled wire between two adjacent bolts is the same and is not tightened. Specifically, the enameled wire reserve (i.e., the actual length of the enameled wire between two adjacent bolts minus the length of the enameled wire between two adjacent bolts when tightened) is adjustable, so as to make early warning adjustments for the looseness degree in different situations. In actual settings, the enameled wire stretching length caused by the rotation angle is first calculated based on the bolt size and the spacing between the two hanging ears, and then the enameled wire reserve is determined based on the bolt loosening warning value (i.e., the bolt is loose to the extent that an early warning is required).

[0026] In this embodiment, the line between the two hanging ears passes through the center point of the bolt head, and the cover plate is fixed at the center position of the bolt head, that is, the line between the two hanging ears passes through the center point of the cover plate. The cover plate in the figure is circular, that is, the two hanging ears are located on a diameter line of the cover plate. Furthermore, the two hanging ears are close to the edge of the bolt head, ensuring that when the bolt is loose, the enameled wire rotates with the bolt head to a greater extent, the enameled wire is easier to be stretched, and the loosening of the bolt can be detected as early as possible.

[0027] In this embodiment, the fixing direction of the enameled wire on the bolt head through the two hanging ears is the direction in which the enameled wire will be stretched when the bolt is loosened. Figure 1 As shown, the bolt loosening direction is clockwise, and the fixing direction of the enameled wire on the bolt head through the two hanging ears is counterclockwise of the line connecting each bolt and the center point of the flange, so that when the bolt loosens clockwise, the enameled wire in the reverse direction is wound and tightened with its fixing bolt as the center. In actual settings, if the bolt loosens in the counterclockwise direction, the fixing direction of the enameled wire on the bolt head through the two hanging ears is clockwise of the line connecting each bolt and the center point of the flange.

[0028] The on-off data monitoring and acquisition unit is connected to the host computer. When the bolt is loose, the bolt head rotates, and the bolt head drives the enameled wire on the lug to rotate synchronously, thereby stretching the enameled wire. When the bolt continues to loosen or even breaks, the stretched enameled wire will break. The on-off data monitoring and acquisition unit monitors the conduction signal of the enameled wire and transmits the conduction signal to the host computer, effectively monitoring the loosening of the bolt. In this embodiment, an alarm module is provided on the host computer. When the host computer receives the loss of the conduction signal, the alarm module sends an alarm, and the ladder operation and maintenance personnel promptly replace and repair the bolts.

[0029] Based on the characteristics of enameled wire that it can be electrically conductive and easily broken, the utility model invents a wind turbine bolt monitoring device based on enameled wire. By monitoring the conduction signal of the enameled wire, early warning of the risk of bolt loosening or even breaking is issued and timely maintenance is carried out, thereby realizing effective monitoring of the bolts and realizing one-time monitoring of the loosening or breaking problems of all bolts on the same flange at a low cost.

Claims

1. A wind turbine bolt monitoring device based on enameled wire, comprising at least enameled wire and a continuity data monitoring and acquisition unit, characterized in that: Two hanging ears are fixedly provided on the bolt head of the bolt, the enameled wire passes through the two hanging ears on the bolt head and is fixedly connected to the two hanging ears, and the enameled wire connects all the bolts on the same flange in series and is connected to the on-off data monitoring and acquisition unit, the on-off data monitoring and acquisition unit is connected to the host computer, when the bolt is loosened, the bolt head drives the enameled wire on the hanging ear to rotate synchronously, the enameled wire is stretched and broken, and the on-off data monitoring and acquisition unit monitors the conduction signal of the enameled wire and transmits the conduction signal to the host computer.

2. The wind turbine bolt monitoring device based on enameled wire according to claim 1 is characterized in that: The bolt heads of the bolts are fixedly connected with a cover plate, and the two hanging ears are fixedly arranged on the cover plate.

3. The wind turbine bolt monitoring device based on enameled wire according to claim 2 is characterized in that: The cover plate is a magnetic cover plate, which is fixed on the bolt head by magnetic adsorption.

4. The wind turbine bolt monitoring device based on enameled wire according to claim 2 is characterized in that: The cover plate is fixed at the center position of the bolt head.

5. The wind turbine bolt monitoring device based on enameled wire according to claim 1 is characterized in that: The connecting line between the two hanging ears passes through the center point of the bolt head, and the two hanging ears are close to the edge of the bolt head.

6. The wind turbine bolt monitoring device based on enameled wire according to claim 1 is characterized in that: The fixing direction of the enameled wire on the bolt head via the two hanging ears is the direction in which the enameled wire will be stretched when the bolt is loosened.

7. The wind turbine bolt monitoring device based on enameled wire according to claim 1 is characterized in that: The length of the enameled wire between two adjacent bolts is the same and is not tightened.

8. The wind turbine bolt monitoring device based on enameled wire according to claim 7 is characterized in that: The actual length of the enameled wire between two adjacent bolts minus the length of the enameled wire between two adjacent bolts when tightened is the reserved amount of the enameled wire. The reserved amount of the enameled wire is adjusted according to the size of the bolt, the distance between the two hanging ears, and the bolt loosening warning value.

9. The wind turbine bolt monitoring device based on enameled wire according to claim 1, characterized in that: The enameled wire is wound around the hanging ear and fixed by gluing.

10. The wind turbine bolt monitoring device based on enameled wire according to claim 1, characterized in that: The host computer is provided with an alarm module, and when the host computer receives a conduction signal loss, the alarm module sends out an alarm.

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