Wind turbine generator bolt load monitoring device based on fine deformation monitoring

Abstract

The invention discloses a wind turbine generator bolt load monitoring device based on fine deformation monitoring, which comprises a data communication unit, a plurality of transmitting module units and a plurality of sensor ends, and is characterized in that each sensor end comprises a lower bearing body, a top end cover, a high-precision strain resistance bridge, a fine deformation beam and a lifting pin, the top end cover is installed at the first end of the lower bearing body, the lower bearing body is provided with a hollow space on the inner side of the top end cover, the lower bearing body is provided with a plurality of through lifting pin holes in the radial direction, the lifting pins are placed in the lifting pin holes, the fine deformation beam is installed at the top of the lower bearing body, and the first ends of the lifting pins make contact with the fine deformation beam. The second end of the lifting pin protrudes out of the second end of the lower bearing body and makes contact with a nut to be monitored, and the high-precision strain resistance bridge is pasted on the fine deformation beam and used for outputting a sensor end signal. And each transmitting module unit at least acquires one path of sensor end signal and performs data optimization and data fidelity processing on the sensor end signal.

Description

Technical Field

[0001] The present invention relates to the field of wind turbine monitoring, and in particular to a wind turbine bolt load monitoring device based on subtle deformation monitoring. Background Art

[0002] The daily operation of large-scale wind turbine groups will inevitably bring great demand for unit operation and maintenance. In order to reduce the maintenance workload, wind turbine manufacturers have improved the design quality, adopted advanced design technology, and strictly controlled the production process, thereby improving the quality and operation stability of various components of wind turbines. More and more functional or structural components in wind turbines under existing processes have adopted maintenance-free production and installation processes to reduce the subsequent operation and maintenance workload.

[0003] In order to reduce the workload of unit operation and maintenance and improve the power generation efficiency of the whole machine and the whole field, in addition to relying on the unit's own product quality and the precision of daily operation and maintenance, technical monitoring methods can also be used to monitor the operating health status of the unit in real time. Among them, the connections between the various components of the unit are usually connected in a bolted manner, such as between the hub pitch bearing and the blade, between the generator set and the main frame, and between the towers on each floor. The bolt connections between the components have pre-tightening requirements and each inspection cycle also requires relevant maintenance inspections. There are many fastening bolts on each unit, and frequent torque or looseness inspections will increase the workload. At the same time, it is difficult to find bolts that are loose but not completely separated in daily simple inspections, and even those that are loose may not be intuitively judged by the naked eye. Most of the bolt loosening monitoring products currently available on the market are of the "switch quantity" type. When the loosening alarm is generated, the bolts are already loose, and there is no early warning of loosening. Under the current production background, it is necessary to develop a technical product with low investment cost, high monitoring accuracy and early warning. Summary of the invention

[0004] The present invention provides a wind turbine bolt load monitoring device based on subtle deformation monitoring, which is used to solve the technical problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides a wind turbine bolt load monitoring device based on subtle deformation monitoring, which includes a data communication unit, a plurality of transmission module units and a plurality of sensor terminals.

[0006] The sensor end includes a lower support body, a top cover, a high-precision strain resistance bridge, a fine deformation beam and a top pin. The side surface of the lower support body is annular, and the top cover is installed at the first end of the lower support body. The lower support body is provided with a hollow space on the inner side of the top cover. The lower support body is provided with a plurality of penetrating top pin holes in the radial direction. The top pins are placed in the top pin holes. The hollow space is used for installing the fine deformation beam and the high-precision strain resistance bridge. The fine deformation beam is installed on the top of the lower support body. The first end of the top pin contacts the fine deformation beam. The second end of the top pin protrudes from the second end of the lower support body and contacts the nut to be monitored. The high-precision strain resistance bridge is pasted on the fine deformation beam. The high-precision strain resistance bridge is used to output the sensor end signal.

[0007] The top cover and the lower support are provided with threaded holes with matching positions. When in use, the threaded holes are connected with external screws, so that the bolt load monitoring device and the unloosened nut to be monitored are relatively stationary.

[0008] Each transmitter module unit collects at least one sensor end signal and performs data optimization and data fidelity processing on the sensor end signal. Each transmitter module unit is connected to the data communication unit.

[0009] The data communication unit is connected with the host computer control system.

[0010] In one embodiment of the present invention, the sensor end monitors the bolt rotation angle with an accuracy of less than 1°, and monitors the bolt rotation displacement with an accuracy of less than 10 μm.

[0011] In one embodiment of the present invention, the lower support body and the top cover are made of a material capable of shielding electromagnetic interference.

[0012] In one embodiment of the present invention, the lower support body and the top cover, and the fine deformation beam and the lower support body are all installed by bolts.

[0013] In one embodiment of the present invention, a through fastening hole is further provided on the side surface of the lower support body, and the fastening hole is used for installing a top screw to further fasten the lower support body.

[0014] The wind turbine bolt load monitoring device based on subtle deformation monitoring provided by the present invention can accurately monitor the loosening state of the bolts and can give an alarm as soon as the nuts become loose. It has low manufacturing cost, simple installation and strong practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall connection relationship of a wind turbine bolt load monitoring device based on subtle deformation monitoring according to an embodiment of the present invention;

[0017] Figure 2A is a three-dimensional diagram of a sensor end according to an embodiment of the present invention;

[0018] Figure 2B is a cross-sectional view of a sensor end according to an embodiment of the present invention;

[0019] Figure 2C A top view of a sensor end according to an embodiment of the present invention;

[0020] Figure 2D is a side view of a sensor end according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a top cover according to an embodiment of the present invention;

[0022] Figure 4A A three-dimensional diagram of a top pin according to an embodiment of the present invention;

[0023] Figure 4B A front view of a top pin according to an embodiment of the present invention;

[0024] Figure 4C A side view of a push pin according to an embodiment of the present invention;

[0025] Figure 5A A three-dimensional diagram of a micro-deformation beam according to an embodiment of the present invention;

[0026] Figure 5B A top view of a micro-deformation beam according to an embodiment of the present invention;

[0027] Figure 5C A side view of a micro-deformation beam according to an embodiment of the present invention;

[0028] Fig. 6A A three-dimensional diagram of a lower support body according to an embodiment of the present invention;

[0029] Figure 6B A top view of a lower support body according to an embodiment of the present invention;

[0030] Figure 6C A side view of a lower support body according to an embodiment of the present invention;

[0031] Figure 7 This is a usage status diagram of a wind turbine bolt load monitoring device based on subtle deformation monitoring according to an embodiment of the present invention.

[0032] Explanation of the accompanying drawings: 1-data communication unit; 2-transmitter module unit; 3-sensor end; 4-fastening hole; 31-lower support body; 32-top cover; 33-high-precision strain resistance bridge; 34-fine deformation beam; 35-push pin; hollow space A; push pin hole 311; threaded hole B; external screw C; nut to be monitored D; 321, 322, 323-installation holes. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1 FIG. 1 is a schematic diagram showing the overall connection relationship of a wind turbine bolt load monitoring device based on fine deformation monitoring according to an embodiment of the present invention. The wind turbine bolt load monitoring device based on fine deformation monitoring provided by the present invention comprises a data communication unit 1, a plurality of transmission module units 2 and a plurality of sensor terminals 3. Figure 1 It can be seen that each transmitter module unit 2 is connected to multiple sensor terminals 3, and the data communication unit 1 is connected to multiple transmitter module units 2.

[0035] Figure 2A FIG. 4 is a three-dimensional diagram of a sensor end according to an embodiment of the present invention. Figure 2B is a cross-sectional view of a sensor end according to an embodiment of the present invention, Figure 2C is a top view of a sensor end according to an embodiment of the present invention, Figure 2D FIG. 4 is a side view of a sensor end according to an embodiment of the present invention. Figure 2A to Figure 2D As shown, the sensor end 3 includes a lower support body 31, a top cover 32, a high-precision strain resistor bridge 33, a fine deformation beam 34 and a top pin 35. The side surface of the lower support body 31 is annular, as shown in FIG. Figure 3 The figure shows a schematic diagram of a top cover of an embodiment of the present invention, wherein the top cover 32 is mounted on the first end of the lower support body 31, and the lower support body 31 is provided with a hollow space A on the inner side of the top cover 32. The lower support body 31 is provided with a plurality of through-penetrating ejector holes 311 in the radial direction, and the ejector pins 35 are placed in the ejector holes 311. The ejector holes 311 have the function of limiting the movement and placing the ejector pins 35. The hollow space A is provided for installing a fine deformation beam 34 and a high-precision strain resistance bridge 35. The fine deformation beam 34 is mounted on the top of the lower support body 31, and the first end of the ejector pin 35 contacts the fine deformation beam 34. The second end of the ejector pin 35 protrudes from the second end of the lower support body 31 and contacts the nut D to be monitored, as shown in FIG. Figure 4A , Figure 4B , Figure 4CThe figures are a stereoscopic view, a front view and a side view of a push pin according to an embodiment of the present invention. A high-precision strain resistor bridge 33 is attached to a fine deformation beam 34. The high-precision strain resistor bridge 33 is used to output a sensor end signal, such as Figure 5A , Figure 5B , Figure 5C 1 and 2 show a three-dimensional view, a top view and a side view of a micro-deformation beam according to an embodiment of the present invention. Fig. 6A , Figure 6B , Figure 6C Shown are three-dimensional views of a lower support body according to an embodiment of the present invention.

[0036] Figure 7 The following is a diagram of the use status of a bolt load monitoring device for a wind turbine based on fine deformation monitoring according to an embodiment of the present invention. The top cover 32 and the lower support body 31 are provided with threaded holes B with matching positions. When in use, the threaded hole B is connected to an external screw rod C, so that the bolt load monitoring device and the unloosened nut D to be monitored are relatively stationary. When the nut D to be monitored is loosened, the nut D to be monitored is screwed out toward the sensor end, which will apply a force to the ejector pin 35, and the ejector pin 35 will further trigger the fine deformation beam 34 to deform. Since the high-precision strain resistor bridge 33 is attached to the fine deformation beam 34, the high-precision strain resistor bridge 33 outputs a sensor end signal due to changes in internal resistance or pressure difference of the bridge section.

[0037] Each transmitter module unit 2 collects at least one sensor end signal and performs data optimization and data fidelity processing on the sensor end signal. Each transmitter module unit 2 is connected to the data communication unit 1.

[0038] The data communication unit 1 is connected to the host control system.

[0039] In one embodiment of the present invention, the sensor end monitors the bolt rotation angle with an accuracy of less than 1°, and monitors the bolt rotation displacement with an accuracy of less than 10 μm.

[0040] In one embodiment of the present invention, the lower support body and the top cover are made of a material capable of shielding electromagnetic interference.

[0041] In one embodiment of the present invention, the lower support body 31 and the top cover 32, and the fine deformation beam 34 and the lower support body 31 are all installed by bolts. Figure 2A , Figure 3 After the mounting holes 321 in the bottom of the housing are bolted, the lower support 31 can be connected to the top cover 32. Figure 5A , Figure 5B The mounting holes 322, Figure 6B After bolts are installed in the mounting holes 323 in the lower support 31 , the fine deformation beam 34 can be connected to the lower support 31 .

[0042] In one embodiment of the present invention, the side of the lower support body is further provided with a through fastening hole 4, and the fastening hole 4 is used to install a top screw to further fasten the lower support body. Figure 7 The middle external screw rod C is tightened to further fix the sensor end and the external screw rod C so that no relative movement occurs.

[0043] In other embodiments, the wind turbine bolt load monitoring device based on subtle deformation monitoring provided by the present invention can be set on the nut D to be monitored by other means, such as clamping, gluing or switching.

[0044] The wind turbine bolt load monitoring device based on subtle deformation monitoring provided by the present invention can accurately monitor the loosening state of the bolts and can give an alarm as soon as the nuts become loose. It has low manufacturing cost, simple installation and strong practical value.

[0045] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0046] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wind turbine bolt load monitoring device based on subtle deformation monitoring, characterized in that: It includes a data communication unit, multiple transmitter module units and multiple sensor terminals. The sensor end includes a lower support body, a top cover, a high-precision strain resistance bridge, a fine deformation beam and a top pin. The side surface of the lower support body is annular, and the top cover is installed at the first end of the lower support body. The lower support body is provided with a hollow space on the inner side of the top cover. The lower support body is provided with a plurality of penetrating top pin holes in the radial direction. The top pins are placed in the top pin holes. The hollow space is used for installing the fine deformation beam and the high-precision strain resistance bridge. The fine deformation beam is installed on the top of the lower support body. The first end of the top pin contacts the fine deformation beam. The second end of the top pin protrudes from the second end of the lower support body and contacts the nut to be monitored. The high-precision strain resistance bridge is pasted on the fine deformation beam. The high-precision strain resistance bridge is used to output the sensor end signal. The top cover and the lower support are provided with threaded holes with matching positions. When in use, the threaded holes are connected with external screws, so that the bolt load monitoring device and the unloosened nut to be monitored are relatively stationary. Each transmitter module unit collects at least one sensor end signal and performs data optimization and data fidelity processing on the sensor end signal. Each transmitter module unit is connected to the data communication unit. The data communication unit is connected with the host computer control system.

2. The wind turbine bolt load monitoring device based on subtle deformation monitoring according to claim 1 is characterized in that: The sensor end monitors the bolt rotation angle with an accuracy of less than 1°, and the bolt rotation displacement with an accuracy of less than 10μm.

3. The wind turbine bolt load monitoring device based on subtle deformation monitoring according to claim 1 is characterized in that: The lower support body and the top cover are made of materials capable of shielding electromagnetic interference.

4. The wind turbine bolt load monitoring device based on subtle deformation monitoring according to claim 1 is characterized in that: The lower support body and the top cover, as well as the micro-deformation beam and the lower support body are all installed by bolts.

5. The wind turbine bolt load monitoring device based on subtle deformation monitoring according to claim 1 is characterized in that: The side surface of the lower support body is further provided with a through fastening hole, and the fastening hole is used for installing a top screw to further fasten the lower support body.

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