Bolt fracture detection device and wind generating set

Abstract

The utility model discloses a bolt fracture detection device and a wind generating set, and relates to the technical field of wind power generation, the bolt fracture detection device comprises an enameled wire, a proximity switch and an on-off control terminal, the enameled wire is used for being fixedly connected with each main shaft bolt of the wind generating set; the proximity switches and the enameled wires are arranged at intervals; and the opening and closing control terminal is electrically connected with the proximity switch and is used for controlling the opening and closing of a power supply of the wind generating set. In the technical scheme of the utility model, the proximity switch outputs normal current when normally detecting the metal of the enameled wire, which represents that the unit is normal; when the spindle bolt is broken, the output current of the proximity switch is reduced to zero, the unit reports a fault, and the on-off control terminal controls the unit to stop due to the fault; the main shaft bolt is monitored in real time through the bolt fracture detection device, once the main shaft bolt is fractured, the opening and closing control terminal can immediately control the unit to stop, and therefore the unit is protected and prevented from continuing to run to cause faults.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, and particularly relates to a bolt fracture detection device and a wind turbine generator set. Background Art

[0002] A wind turbine generator set is composed of a generator, an impeller, a transmission system, a nacelle, a tower barrel, etc. Three blades and their pitch components together form the impeller. In a wind turbine generator set, the impeller transmits mechanical energy to the gearbox through the main shaft, and the bolts on the blades and the main shaft bear relatively large wind loads.

[0003] Although high-strength bolts are generally used for connection at present, and a bolt detector is used for crack detection during regular inspections or on-board inspections, it is still found that there are invisible or direct fractures in the fixed bolts of the main shaft and blades.

[0004] If the lubrication of the bolt installation process of the whole machine is not in place, since the bolt detector cannot detect the problem of bolt fracture in real time, under the impact of high wind loads, the fracture of the fixed bolts of the main shaft and blades may be aggravated, resulting in an increase in maintenance costs and even causing serious faults of the unit and shutdown. Summary of the Utility Model

[0005] The main purpose of the utility model is to propose a bolt fracture detection device and a wind turbine generator set, aiming to monitor in real time whether the main shaft bolts are fractured.

[0006] To achieve the above object, the bolt fracture detection device proposed by the utility model is applied to a wind turbine generator set, and the bolt fracture detection device includes

[0007] Enameled wire, which is used for fixedly connecting with each main shaft bolt of the wind turbine generator set;

[0008] Proximity switch, which is used for connecting to the main shaft of the wind turbine generator set and facing the enameled wire; the proximity switch is arranged at an interval from the enameled wire; and

[0009] Open / close control terminal, which is electrically connected to the proximity switch and is used for controlling the opening and closing of the power supply of the wind turbine generator set.

[0010] In an embodiment, the bolt fracture detection device further includes a magnetic base, which is fixedly connected to one end of the proximity switch away from the enameled wire and is used for adsorbing the main shaft.

[0011] In an embodiment, the bolt fracture detection device further includes a sleeve, which is used for fixedly connecting with each main shaft bolt, and the enameled wire is arranged inside the sleeve.

[0012] In one embodiment, the casing is made of aramid.

[0013] In one embodiment, the bolt breakage detection device further includes an alarm, which is arranged on the main shaft and electrically connected to the proximity switch.

[0014] In one embodiment, the bolt breakage detection device further includes an electromagnetic signal shielding component, which includes a shielding cylinder for connecting the main shaft; the shielding cylinder abuts against the enameled wire, and the proximity switch is located inside the shielding cylinder.

[0015] In one embodiment, the electromagnetic signal shielding component further includes a conductive coating provided on the inner peripheral wall of the shielding cylinder.

[0016] In one embodiment, the shielding cylinder is made of graphene.

[0017] In one embodiment, the shortest distance between the proximity switch and the enameled wire is defined as L, and 2mm ≤ L ≤ 3mm.

[0018] The present utility model also provides a wind turbine generator, which includes an impeller, a main shaft, a main shaft bolt, and any one of the above bolt breakage detection devices. The impeller is detachably connected to the main shaft, the main shaft is threadedly connected to the main shaft bolt, the enameled wire is fixedly connected to the main shaft bolt, and the proximity switch is arranged on the main shaft.

[0019] In the technical solution of the present utility model, the bolt breakage detection device includes an enameled wire, a proximity switch, and an opening and closing control terminal. The enameled wire is used for fixedly connecting to each main shaft bolt of the wind turbine generator; the proximity switch is used for connecting to the main shaft of the wind turbine generator and is arranged facing the enameled wire; the proximity switch and the enameled wire are arranged at intervals; the opening and closing control terminal is electrically connected to the proximity switch and is used for controlling the opening and closing of the power supply of the wind turbine generator. In the technical solution of the present utility model, the proximity switch can sense the enameled wire; the proximity switch has three wires, two of which are power supply wires connected to the power supply module in the nacelle, and the other is the lead wire of the opening and closing control terminal; when the proximity switch normally detects the metal of the enameled wire, it outputs a normal current, which is connected to the carbon brush feedback wire, indicating that the unit is normal; when the main shaft bolt breaks, together with the enameled wire breaking, the main shaft bolt and part of the enameled wire fall off, and when the main shaft rotates, the proximity switch cannot detect the fallen main shaft bolt and the enameled wire on it, and the output current will become 0V, and the unit reports a carbon brush wear fault, and the opening and closing control terminal controls the unit to stop due to the fault; through the bolt breakage detection device, the main shaft bolt is monitored in real time. Once the main shaft bolt breaks, the opening and closing control terminal can immediately control the unit to stop, so as to protect the unit from continuing to operate and causing a fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 FIG. 1 is a schematic structural diagram of an embodiment of the bolt fracture detection device provided by the present invention;

[0022] Figure 2 For Figure 1 FIG. 2 is a partial enlarged view of part A in FIG. 1;

[0023] Figure 3 FIG. 3 is a schematic structural diagram of an embodiment of the sleeve in the bolt fracture detection device;

[0024] Figure 4 FIG. 4 is a schematic structural diagram of an embodiment of the shielding cylinder in the bolt fracture detection device.

[0025] Explanation of the reference numerals in the drawings:

[0026] 1000, bolt fracture detection device; 1, enameled wire; 2, proximity switch; 3, magnetic base; 4, sleeve; 5, alarm; 61, shielding cylinder; a, spindle bolt; b, spindle.

[0027] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Detailed Embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if the embodiments of the present utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] The present utility model provides a bolt fracture detection device 1000.

[0032] Please refer to Figure 1 and Figure 2 In an embodiment of the present utility model, the bolt fracture detection device 1000 includes an enameled wire 1, a proximity switch 2, and an opening and closing control terminal. The enameled wire 1 is used for fixedly connecting to each main shaft bolt a of the wind turbine generator set; the proximity switch 2 is used for connecting to the main shaft b of the wind turbine generator set and is arranged facing the enameled wire 1; the proximity switch 2 and the enameled wire 1 are arranged at intervals; the opening and closing control terminal is electrically connected to the proximity switch 2 and is used for controlling the opening and closing of the power supply of the wind turbine generator set.

[0033] In the technical solution of the present utility model, the proximity switch 2 can sense the enameled wire 1; the proximity switch 2 has three wires. Two are power supply wires connected to the power supply module in the nacelle, and the other is the lead wire of the opening and closing control terminal; when the proximity switch 2 normally detects the metal of the enameled wire 1, it outputs a normal current, which is connected to the carbon brush feedback wire, indicating that the unit is normal; when the main shaft bolt a fractures, together with the enameled wire 1, the main shaft bolt a and part of the enameled wire 1 fall off. When the main shaft b rotates, the proximity switch 2 cannot detect the fallen main shaft bolt a and the enameled wire 1 on it, and the output current will become 0V, and the unit reports a carbon brush wear fault. The opening and closing control terminal controls the unit to stop due to a fault; through the bolt fracture detection device 1000, real-time monitoring of the main shaft bolt a is carried out, improving the monitoring accuracy; once the main shaft bolt a fractures, the opening and closing control terminal can immediately control the unit to stop, thereby protecting the unit from continuing to operate and causing a fault.

[0034] It can be understood that the connection method between the proximity switch 2 and the main shaft b can be welding or bonding. Please refer to Figure 1 and Figure 2, in an embodiment of the present utility model, the bolt fracture detection device 1000 further includes a magnetic base 3. The magnetic base 3 is fixedly connected to the end of the proximity switch 2 away from the enameled wire 1 and is used to adsorb the main shaft b. The use of the magnetic base 3 provides a stable fixing method, enabling the proximity switch 2 to be firmly adsorbed on the main shaft b, reducing displacement caused by vibration or impact, thereby improving the detection stability and reliability of the bolt fracture detection device 1000; the design of the magnetic base 3 allows for the quick and convenient installation and disassembly of the proximity switch 2; since the magnetic base 3 can ensure a constant distance between the proximity switch 2 and the main shaft b, it helps to improve the detection sensitivity of the proximity switch 2 to the enameled wire 1 and ensure the accurate transmission of signals; in the case of the fracture of the main shaft bolt a, the magnetic base 3 can ensure that the proximity switch 2 does not fall off due to the fracture of the main shaft bolt a.

[0035] Please refer to Figure 3 , in an embodiment of the present utility model, the bolt fracture detection device 1000 further includes a sleeve 4. The sleeve 4 is used for fixedly connecting with each main shaft bolt a, and the enameled wire 1 is arranged inside the sleeve 4. The sleeve 4 can protect the enameled wire 1 from being damaged by external objects, thereby ensuring the monitoring accuracy of the bolt fracture detection device 1000.

[0036] It can be understood that the material of the sleeve 4 can be aramid or polyphenylene sulfide. In an embodiment of the present utility model, the material of the sleeve 4 is aramid. Aramid, full name "poly-p-phenylene terephthalamide", is a high-performance synthetic fiber with excellent properties such as ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight; aramid fibers have excellent tensile strength, with a strength exceeding 5 to 6 times that of high-quality steel, and at the same time, their density is relatively low, and the impact on the operation of the main shaft b can be almost negligible; the dielectric constant of the aramid fiber composite material is as low as about 3.85 (10 GHz), ensuring good signal penetration performance and strength through the aramid sleeve 4, thereby enabling the proximity switch 2 to accurately monitor the enameled wire 1. Therefore, aramid is preferably used as the material of the sleeve 4.

[0037] Please refer to Figure 1 , in an embodiment of the present utility model, the bolt fracture detection device 1000 further includes an alarm 5. The alarm 5 is arranged on the main shaft b and is electrically connected to the proximity switch 2. When the proximity switch 2 detects a bolt fracture, that is, when it cannot sense the enameled wire 1, the alarm 5 will immediately give an audible and visual alarm, reminding the staff or the automatic control system to take emergency measures, such as shutting down for inspection, to avoid further equipment damage or accidents; the addition of the alarm 5 improves the safety of the entire detection system because it can quickly respond to potential fault situations, reducing the risk of accidents and ensuring the safety of personnel and equipment; as an integral part of the detection system, the addition of the alarm 5 makes the entire system more complete, improving the accuracy and reliability of fault detection.

[0038] Please refer to Figure 4 Figure 4 In an embodiment of the present utility model, the bolt fracture detection device 1000 further includes an electromagnetic signal shielding component. The electromagnetic signal shielding component includes a shielding cylinder 61, and the shielding cylinder 61 is used to connect to the main shaft b; the shielding cylinder 61 abuts against the enameled wire 1, and the proximity switch 2 is located inside the shielding cylinder 61. The shielding cylinder 61 can effectively isolate external electromagnetic interference, ensure that the detection signal of the proximity switch 2 is not interfered by external factors, and thus improve the accuracy of bolt state detection; the shielding cylinder 61 not only protects the enameled wire 1 from physical damage in the external environment, but also protects the proximity switch 2 from the influence of mechanical vibration or impact, thereby extending the service life of the device.

[0039]

[0039] Furthermore, in an embodiment of the present utility model, the electromagnetic signal shielding component further includes a conductive coating, and the conductive coating is provided on the inner peripheral wall of the shielding cylinder 61. The conductive coating further improves the stability of the proximity switch 2 to sense the enameled wire 1 by reducing external electromagnetic interference, ensuring that the state of the main shaft bolt a can be reliably detected under various environmental conditions.

[0040]

[0040] It can be understood that the material of the shielding cylinder 61 can be graphene or copper. In an embodiment of the present utility model, the material of the shielding cylinder 61 is graphene. Graphene has high conductivity and a large specific surface area, can effectively absorb and reflect electromagnetic waves, and provides excellent electromagnetic shielding effect; graphene-based materials can be prepared into flexible shielding cylinders 61, which are suitable as the material of the shielding cylinder 61 that needs to be installed inside the wind turbine. At the same time, the density of graphene is small, and the influence on the operation of the main shaft b can be almost ignored.

[0041]

[0041] In an embodiment of the present utility model, the shortest distance between the proximity switch 2 and the enameled wire 1 is defined as L, and 2mm ≤ L ≤ 3mm. 2mm ≤ L ≤ 3mm can ensure that the distance between the proximity switch 2 and the enameled wire 1 will neither cause physical interference due to being too close nor affect the induction effect due to being too far; maintaining a distance range of 2mm to 3mm can optimize the induction sensitivity of the proximity switch 2 to the enameled wire 1 and ensure accurate detection of the state of the main shaft bolt a.

[0042]

[0042] The present utility model also proposes a wind power generation set, which includes an impeller, a main shaft b, a main shaft bolt a, and a bolt fracture detection device 1000. The specific structure of the bolt fracture detection device 1000 refers to the above embodiment. Since this wind power generation set adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here.

[0043] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A bolt fracture detection device (1000), applied to a wind turbine generator set, characterized in that: The bolt fracture detection device (1000) comprises An enameled wire (1), the enameled wire (1) being used for being fixedly connected to each main shaft bolt (a) of the wind turbine generator set; A proximity switch (2), the proximity switch (2) being used to connect to the main shaft (b) of the wind turbine generator set and being arranged facing the enameled wire (1); the proximity switch (2) and the enameled wire (1) being arranged at a distance; as well as An on / off control terminal, the on / off control terminal is electrically connected to the proximity switch (2) and is used to control the on / off of the power supply of the wind turbine generator set.

2. The bolt fracture detection device (1000) according to claim 1, characterized in that: The bolt fracture detection device (1000) further comprises a magnetic base (3), wherein the magnetic base (3) is fixedly connected to an end of the proximity switch (2) away from the enameled wire (1) and is used to absorb the main shaft (b).

3. The bolt fracture detection device (1000) according to claim 1, characterized in that: The bolt fracture detection device (1000) further comprises a sleeve (4), wherein the sleeve (4) is used for being fixedly connected to each of the main shaft bolts (a), and the enameled wire (1) is arranged in the sleeve (4).

4. The bolt fracture detection device (1000) according to claim 3, characterized in that: The material of the sleeve (4) is aramid.

5. The bolt fracture detection device (1000) according to claim 1, characterized in that: The bolt fracture detection device (1000) further comprises an alarm (5), wherein the alarm (5) is arranged on the main shaft (b) and is electrically connected to the proximity switch (2).

6. The bolt fracture detection device (1000) according to any one of claims 1 to 5, characterized in that: The bolt fracture detection device (1000) further comprises an electromagnetic signal shielding component, wherein the electromagnetic signal shielding component comprises a shielding cylinder (61), wherein the shielding cylinder (61) is used to connect the main shaft (b); the shielding cylinder (61) abuts against the enameled wire (1), and the proximity switch (2) is located inside the shielding cylinder (61).

7. The bolt fracture detection device (1000) according to claim 6, characterized in that: The electromagnetic signal shielding component also includes a conductive coating, which is arranged on the inner peripheral wall of the shielding cylinder (61).

8. The bolt fracture detection device (1000) according to claim 6, characterized in that: The shielding tube (61) is made of graphene.

9. The bolt fracture detection device (1000) according to any one of claims 1 to 5, characterized in that: The shortest distance between the proximity switch (2) and the enameled wire (1) is defined as L, 2mm≤L≤3mm.

10. A wind turbine generator set, characterized in that: The wind turbine generator set comprises an impeller, a main shaft (b), a main shaft bolt (a), and a bolt fracture detection device (1000) as described in any one of claims 1 to 9, wherein the impeller is detachably connected to the main shaft (b), the main shaft (b) is threadedly connected to the main shaft bolt (a), the enameled wire (1) is fixedly connected to the main shaft bolt (a), and the proximity switch (2) is arranged on the main shaft (b).

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