Wind turbine generator gear box planet wheel play online monitoring device

Abstract

The utility model belongs to the technical field of wind power generation, and discloses a wind turbine generator gearbox planet wheel play on-line monitoring device which comprises a hollow screw rod, a proximity switch sensor, an acquisition device, a wireless router and a server. The hollow lead screw is located on the inner side of the wind turbine generator gearbox, and one end of the hollow lead screw is installed at a screw hole formed in an end cover of the wind turbine generator gearbox in advance in a threaded fit mode. The proximity switch sensor penetrates into an inner cavity of the hollow lead screw from the outer side of the wind turbine generator gearbox, and a probe of the proximity switch sensor extends out of the other end of the hollow lead screw and points to the planet wheel. And the acquisition device is connected with the proximity switch sensor. Interference between the monitoring device and a planetary gear train transmission system which runs complexly is avoided by utilizing the hollow screw rod, the proximity switch sensor monitors the axial play stroke of the planetary gear in real time and feeds back the axial play stroke to the acquisition device, and then the axial play stroke is transmitted to the server through the wireless router, so that the aim of monitoring the play fault of the planetary gear on line is fulfilled.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind power generation, and relates to a planetary gear axial displacement monitoring device, in particular to an on-line monitoring device for the axial displacement of planetary gears in a wind turbine gearbox. Background Technique

[0002] The axial displacement of the planetary gears in the wind turbine gearbox has always been a difficult problem affecting the normal operation of the unit. The self-axial displacement of the planetary gears will cause their tooth surfaces to bear uneven loads, resulting in pitting, spalling, and increased wear on the tooth surfaces. In severe cases, the teeth of the planetary gears may break, causing the wind turbine gearbox to fail to transmit power normally. The sun gear and internal gear ring meshing with it will also be subjected to abnormal forces, and pitting, wear, etc. will also occur on their tooth surfaces, affecting their transmission accuracy and service life. The axial displacement of the planetary gears will also directly increase the load on the planetary gear bearings, causing them to bear additional axial and radial forces, which may lead to premature fatigue damage of the bearings, such as raceway wear, roller breakage, and cage damage. The axial displacement of the planetary gears will also cause the planet carrier to bear irregular forces, which may lead to deformation and cracking of the planet carrier. Especially under high loads, the damage to the planet carrier may be more serious. These damages and failures will directly or indirectly cause the unit to shut down. After the wind turbine gearbox fails, on-tower maintenance cannot be carried out, and the whole unit must be replaced down the tower. The maintenance cost is extremely high, and the downtime is long. The average downtime can reach 30 days. The high operation and maintenance costs seriously affect the economic benefits of the wind farm.

[0003] Due to the complex internal structure and extremely narrow space of the wind turbine gearbox, there are three planetary gears, and the three planetary gears rotate around their own central axes and revolve around the central axis of the sun gear of the wind turbine gearbox during operation. The complex operation mode in three-dimensional space makes it difficult to monitor. Affected by design conditions and on-site turbulence and other factors, the problem of planetary gear axial displacement is difficult to be completely cured. Some main engine manufacturers regard this problem as an acceptable phenomenon, but still need to be strictly controlled. Once out of control and the axial displacement of the planetary gears exceeds the limit, it will cause the wind turbine gearbox to fail, and such accidents have occurred frequently in reality.

[0004] At present, there is no mature monitoring device at home and abroad to standardize the measurement of planetary gear axial displacement. The monitoring of planetary gear axial displacement is limited to measuring the size parameters such as the diameter and thickness of the planetary gears with simple measuring tools such as vernier calipers and feeler gauges and comparing them with the design values. However, this monitoring method has the following problems: First, there are certain human errors in the detection. The installation position of the planetary gears inside the wind turbine gearbox is usually relatively narrow, and the operation space is limited. Factors such as the operation method and reading accuracy of the detection personnel may affect the accuracy of the measurement results; Second, the detection time is long and the labor intensity is high, making it difficult to achieve real-time monitoring; Third, because the wind turbine gearbox is at a high altitude, it also has a certain impact on the safety of the detection personnel.

[0005] Based on this, there is an urgent need to propose a new type of on-line monitoring device for the planetary gear axial displacement of a wind turbine gearbox to solve the above-mentioned technical problems existing in the prior art. Utility Model Content

[0006] The purpose of the present utility model is to propose an on-line monitoring device for the planetary gear axial displacement of a wind turbine gearbox, which can realize real-time on-line monitoring of the axial displacement of the planetary gear of the wind turbine gearbox to ensure the safe and stable operation of the unit.

[0007] In order to achieve the above object, the present utility model adopts the following technical solutions:

[0008] An on-line monitoring device for the planetary gear axial displacement of a wind turbine gearbox, comprising:

[0009] A hollow lead screw with a hollow structure, the hollow lead screw is located inside the wind turbine gearbox, and one end of the hollow lead screw is installed at a threaded hole pre-opened on the end cover of the wind turbine gearbox through thread fitting;

[0010] A proximity switch sensor for measuring the axial displacement of the planetary gear in the wind turbine gearbox, the proximity switch sensor penetrates into the inner cavity of the hollow lead screw from the outside of the wind turbine gearbox, and the probe of the proximity switch sensor extends out through the other end of the hollow lead screw and points to the planetary gear;

[0011] An acquisition device for collecting and storing the axial displacement data of the planetary gear, the acquisition device is connected to the signal output end of the proximity switch sensor;

[0012] A wireless router for signal connection with the acquisition device;

[0013] And a server for wireless communication connection with the wireless router.

[0014] Preferably, the acquisition device adopts an Ethernet gateway.

[0015] Preferably, the probe of the proximity switch sensor is bonded and fixed to the hollow lead screw with silicone sealant.

[0016] Preferably, the hollow lead screw is vertically installed on the end cover, and the probe of the proximity switch sensor vertically points to the planetary gear.

[0017] Preferably, the sensing distance of the proximity switch sensor is 1 mm, the length of the probe of the proximity switch sensor exceeding the hollow lead screw is 20 mm to 25 mm, and the vertical distance between the probe of the proximity switch sensor and the planetary gear is 5 mm.

[0018] Preferably, the proximity switch sensor adopts a capacitive sensor.

[0019] Preferably, the proximity switch sensor is connected to the acquisition device through a DI interface cable.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] As described above, the utility model relates to an on-line monitoring device for the axial displacement of the planet gear of a wind turbine gearbox. Aiming at the axial displacement fault of the planet gear of the wind turbine gearbox, the hollow lead screw is used for extension, avoiding the interference between the monitoring device and the complex planetary gear train transmission system in operation, solving the problems that the structure of the planetary gear train of the wind turbine gearbox is complex and the space is narrow and not suitable for setting detection devices, and realizing the monitoring of the axial displacement fault of the planet gear. The device monitors the axial displacement stroke of the planet gear in real time through a proximity switch sensor, the acquisition device collects and stores the axial displacement data of the planet gear in real time, and uploads the data to the server wirelessly, realizing the remote on-line monitoring of the axial displacement of the planet gear of the wind turbine gearbox, facilitating the detection personnel to timely master the operation state of the planet gear. The on-line monitoring device for the axial displacement of the planet gear of the wind turbine gearbox of the utility model can monitor the fault at the initial stage of the axial displacement of the planet gear. During this period, the unit can operate normally, facilitating the reservation of time for the replacement process of the wind turbine gearbox, thus reducing the average downtime caused by the axial displacement of the planet gear from the original 30 days to about 3 days, greatly shortening the downtime of the unit, saving the operation and maintenance cost of the wind turbine, and having important significance for reducing the failure rate of the unit and improving the operation reliability of the unit. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0023] Figure 1 It is a schematic diagram of the overall structure of the on-line monitoring device for the axial displacement of the planet gear of the wind turbine gearbox in the embodiment of the present utility model;

[0024] Among them, 1 - hollow lead screw, 2 - proximity switch sensor, 3 - acquisition device, 4 - wireless router, 5 - server, 61 - end cover, 62 - planet gear, 63 - sun gear, 64 - planet carrier, 65 - output shaft. Detailed Embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0026] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, the directional indications will also change accordingly.

[0028] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0029] In the present utility model, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In addition, the technical solutions between various embodiments of the present utility model 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 protection scope required by the present utility model.

[0031] Embodiment:

[0032] As Figure 1 shown, the on-line monitoring device for the planetary gear end-play of a wind turbine gearbox in this embodiment includes a hollow lead screw 1, a proximity switch sensor 2, a collection device 3, a wireless router 4, and a server 5.

[0033] The hollow lead screw 1 adopts a hollow structure. The hollow lead screw 1 is located inside the wind turbine gearbox, and one end of the hollow lead screw 1 is installed at a threaded hole pre-opened on the end cover 61 of the wind turbine gearbox through threaded fit.

[0034] In this embodiment, the number of planetary gears 62 of the wind turbine gearbox is three. The planetary gears 62 are fixedly connected to the output shaft 65 through a planetary carrier 64. During operation, the three planetary gears 62 rotate around their own central axes and also revolve around the central axis of the sun gear 63 of the wind turbine gearbox.

[0035] In this embodiment, the structure of the end cover 61 of the wind turbine gearbox is changed. Threaded holes are drilled in the end cover 61. Specifically, holes are drilled in the end cover 61 (the holes are through holes penetrating the end cover), and then tapping is used to rotate clockwise at a constant speed at the drilled holes, so that the drilled holes form a threaded shape. The external thread of the hollow screw rod is matched with the internal thread of the threaded hole, and the hollow screw rod 1 is screwed into the threaded hole.

[0036] The proximity switch sensor 2 is used to measure the axial displacement of the planet gear 62 in the wind turbine gearbox. The proximity switch sensor 2 penetrates into the inner cavity of the hollow screw rod 1 from the outside of the wind turbine gearbox, and the probe of the proximity switch sensor extends out through the other end of the hollow screw rod and points to the planet gear 62. When the planet gear 62 rotates, the proximity switch sensor 2 can monitor each planet gear 62.

[0037] In this embodiment, the proximity switch sensor 2 adopts a capacitive sensor. A capacitor is formed between the detection surface of the capacitive sensor and the metal surface and participates in the operation of the oscillation circuit. When there is no metal substance approaching, the capacitance value of the capacitor is in a stable initial state, and at this time the oscillator is in a normal oscillation state. When a metal substance approaches the detection surface of the sensor, the metal substance will affect the electric field distribution between the two plates of the capacitor. According to the capacitance calculation formula, the approach of the metal will cause the dielectric constant between the two plates to change (usually the dielectric constant of the metal is different from that of media such as air), or equivalently change the plate area or spacing, resulting in a change in the capacitance value of the capacitor.

[0038] In this embodiment, the probe of the proximity switch sensor is preferably adhesively fixed to the hollow screw rod 1 (specifically, the end of the hollow screw rod 1 close to the planet gear) with silicone sealant. The silicone sealant has excellent weather resistance, good sealing performance, chemical stability, electrical insulation and environmental protection.

[0039] The hollow screw rod 1 is vertically installed on the end cover 61, the probe of the proximity switch sensor vertically points to the planet gear 62, the length that the probe of the proximity switch sensor extends beyond the hollow screw rod 1 is 20 mm to 25 mm, the vertical distance between the probe of the proximity switch sensor and the planet gear 62 is 5 mm, the sensing distance of the proximity switch sensor 2 is 1.0 mm, its response time is less than 0.5 ms, the switching frequency is 2000 Hz, and the operating temperature is -25 °C to 70 °C.

[0040] In this embodiment, the probe of the proximity switch sensor can sequentially monitor each rotating planet gear 62, so as to effectively measure the axial displacement of the planet gear 62 in the wind turbine gearbox.

[0041] The acquisition device 3 is connected to the signal output end of the proximity switch sensor 2. The proximity switch sensor 2 transmits signals to the acquisition device 3 in real time, and the acquisition device 3 collects and stores the axial displacement data of the planet gear.

[0042] Specifically, the proximity switch sensor 2 is connected to the acquisition device 3 through a DI (Digital Signal Input) interface line.

[0043] In this embodiment, the acquisition device 3 preferably adopts an Ethernet gateway. The Ethernet gateway converts the DI digital signal into a network signal and transmits it to the server 5 in the form of Ethernet. The acquisition device 3 is located in the nacelle control box of the wind turbine.

[0044] In the on-line monitoring device for the planetary gear thrust of the wind turbine gearbox in this embodiment, the acquisition device 3 is signal-connected to the wireless router 4, and the wireless router 4 is wirelessly communicatively connected to the server 5.

[0045] In this embodiment, the server 5 is located in the wind farm computer room, and the wireless router 4 is located in the nacelle control box of the wind turbine unit and is connected to the acquisition device 3 through a network cable.

[0046] The wireless router 4 sends out the planetary gear 62 thrust displacement data through the wireless network. The server 5 receives the data sent by the wireless router 4 and alarms and displays the planetary gear 62 thrust fault.

[0047] Through the above design, it is beneficial to realize the remote on-line monitoring of the planetary gear thrust of the wind turbine gearbox.

[0048] The measurement process of the on-line monitoring device for the planetary gear thrust of the wind turbine gearbox of the present utility model is as follows:

[0049] The proximity switch sensor 2 is installed in the hollow lead screw 1 of the end cover 61 of the wind turbine gearbox. The position of the proximity switch sensor 2 is adjusted so that the probe of the proximity switch sensor is perpendicular to the outer surface of the planetary gear 62. At the same time, the distance between the probe of the proximity switch sensor and the outer surface of the planetary gear 62 is adjusted to 5 mm.

[0050] By controlling the data acquisition function of the acquisition device 3, the measurement data of the proximity switch sensor 2 is started to be acquired. The acquisition device 3 can set the acquisition frequency according to user needs, and the acquired data is stored in the acquisition device 3. By controlling the data transmission function of the acquisition device 3, the data acquired by the acquisition device 2 is sent out through the wireless router 4. The server 5 in the centralized control center receives the data sent by the wireless router 4, and the wind turbine operation and maintenance personnel can remotely view the thrust displacement data of the planetary gear 62. When the probe of the proximity switch sensor monitors that the planetary gear 62 has a thrust, the alarm function is triggered to timely notify the maintenance personnel for repair, which can effectively avoid damage to the planetary carrier 64 of the wind turbine gearbox.

[0051] So far, the present embodiment has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the on-line monitoring device for the planetary gear runout of the wind turbine gearbox of the present utility model. The monitoring device is designed for the planetary gear runout fault of the wind turbine gearbox. Its structure is delicate. By using the hollow screw rod 1 for extension, the interference between the monitoring device and the complex planetary gear train transmission system during operation is avoided, solving the problems that the structure of the planetary gear train of the wind turbine gearbox is complex and the space is narrow and not suitable for setting detection devices, and realizing the monitorability of the runout fault of the planetary gear 62. The monitoring device monitors the axial runout stroke of the planetary gear 62 in real time through the proximity switch sensor 2, and records the runout data of the planetary gear 62 in real time through the acquisition device 3, facilitating the detection personnel to timely master the operating state of the planetary gear 62. There is a runout stage of 1 to 2 months between the start of slight runout of the planetary gear 62 and the interference wear between the planetary gear 62 and the planet carrier 64. The planetary gear runout monitoring device of the present utility model can monitor this fault at the initial stage of the runout of the planetary gear 62. During this time period, the wind turbine can operate normally, and the maintenance personnel are reserved the time for the replacement process of the wind turbine gearbox to avoid damage to the planet carrier 64 of the wind turbine gearbox, greatly shortening the unit outage time, reducing the lost power, saving the operation and maintenance cost of the wind turbine, and being of great significance for reducing the unit failure rate and improving the operation reliability of the unit.

[0052] Certainly, the above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made by using the specification and drawings of the present utility model under the inventive concept of the present utility model, or direct / indirect application in other related technical fields are included in the patent protection scope of the present utility model and should be protected by the present utility model.

Claims

1. An on-line monitoring device for the planetary gear movement of a wind turbine gearbox, characterized in that Comprising: A hollow lead screw with a hollow structure, the hollow lead screw is located inside the gearbox of the wind turbine, and one end of the hollow lead screw is installed at a threaded hole pre-opened on the end cover of the gearbox of the wind turbine through threaded fit; A proximity switch sensor for measuring the axial displacement of the planet gear in the gearbox of the wind turbine, the proximity switch sensor penetrates into the inner cavity of the hollow lead screw from the outside of the gearbox of the wind turbine, and the probe of the proximity switch sensor extends out through the other end of the hollow lead screw and points to the planet gear; An acquisition device for collecting and storing the axial displacement data of the planet gear, the acquisition device is connected to the signal output end of the proximity switch sensor; A wireless router for connecting to the acquisition device; And a server for wirelessly communicating with the wireless router.

2. The on-line monitoring device for the axial displacement of the planet gear in the gearbox of the wind turbine according to claim 1, characterized in that The acquisition device adopts an Ethernet gateway.

3. The on-line monitoring device for the axial displacement of the planet gear in the gearbox of the wind turbine according to claim 1, characterized in that The probe of the proximity switch sensor is adhesively fixed to the hollow lead screw with silicone sealant.

4. The on-line monitoring device for the axial displacement of the planet gear in the gearbox of the wind turbine according to claim 1, characterized in that The hollow lead screw is vertically installed on the end cover, and the probe of the proximity switch sensor vertically points to the planet gear.

5. The on-line monitoring device for the axial displacement of the planet gear in the gearbox of the wind turbine according to claim 4, characterized in that The sensing distance of the proximity switch sensor is 1 mm, the length of the probe of the proximity switch sensor extending beyond the hollow lead screw is 20 mm to 25 mm, and the vertical distance between the probe of the proximity switch sensor and the planet gear is 5 mm.

6. The on-line monitoring device for the axial displacement of the planet gear in the gearbox of the wind turbine according to claim 1, characterized in that The proximity switch sensor adopts a capacitive sensor.

7. The on-line monitoring device for the axial displacement of the planet gear in the gearbox of the wind turbine according to claim 1, characterized in that The proximity switch sensor is connected to the acquisition device through a DI interface cable.

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