An online monitoring device for slip displacement of wind turbine coupling

Abstract

The present invention relates to an online monitoring device for the slippage displacement of a wind turbine coupling. The coupling is equipped with a torque overload protection mechanism. The device comprises: a first metal baffle and a first inductive proximity sensor for detecting the first metal baffle, a second metal baffle and a second inductive proximity sensor for detecting the second metal baffle, a controller connected to the first and second inductive proximity sensors, and an actuator connected to the controller. The first and second metal baffles are respectively positioned at the edges of the coupling. The distance between the first inductive proximity sensor and the straight line along the coupling axis is greater than the radius of the end of the coupling where the first metal baffle is mounted, and the distance between the second inductive proximity sensor and the straight line along the coupling axis is greater than the radius of the end of the coupling where the second metal baffle is mounted. Compared with existing technologies, the present invention has the advantages of low false alarm and missed alarm rates.

Description

Technical Field

[0001] The present invention relates to the field of wind turbine coupling slippage monitoring, and in particular to an online monitoring device for the slippage displacement of a wind turbine coupling. Background Art

[0002] Large wind turbines connect the generator and gearbox via a coupling. To protect the entire mechanical transmission chain, which consists of the generator and gearbox, and prevent component damage due to overload, a torque overload protection device is installed in the coupling. When the load is too high, the torque overload protection device releases energy by slipping. Excessive slippage of the torque overload protection device in the coupling will cause damage to the device.

[0003] Currently, wind turbine coupling slip is detected by using a master PLC system to compare the speed difference between the two sides of the coupling. For example, Chinese Patent CN110174264A discloses a wind turbine coupling slip warning device, wind turbine, and warning method. The slip warning device includes a first speed gear, a second speed gear, a first speed measurement sensor, a second speed measurement sensor, a dual-channel counter, and a wind turbine controller. The wind turbine controller calculates the difference in the cumulative pulse counts of the first and second speed gears within a preset time range of the self-starter operation and converts this cumulative pulse count difference into a cumulative pulse angle difference. Finally, the quantified cumulative pulse angle difference can be used to assess the coupling's operating and wear status, determine whether slip is occurring, and provide real-time warnings and maintenance prompts to the user when an anomaly occurs. Furthermore, the slip angle change rate can be calculated based on the cumulative pulse angle difference. By calculating the slip angle change rate over a standard time period, the wind turbine can be judged to determine whether the wind turbine is actually slipping, thereby preventing false alarms caused by signal interference and pulse loss.

[0004] However, due to hardware limitations and software response time, the alarm speed difference setting was high. The false alarm rate of the above solution is proportional to the detection accuracy: high detection accuracy results in a high false alarm rate. To avoid a high false alarm rate, the detection accuracy was set relatively low. This caused the coupling torque overload protection device to slip multiple times, even failing, without generating an alarm. This made it difficult to meet the requirements of low false alarm and missed alarm rates. Summary of the Invention

[0005] The purpose of the present invention is to provide an on-line monitoring device for the slip displacement of a wind turbine coupling.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] An online monitoring device for slip displacement of a wind turbine coupling, wherein a torque overload protection mechanism is installed in the coupling, and the device comprises:

[0008] a first metal baffle and a first inductive proximity sensor for detecting the first metal baffle,

[0009] a second metal baffle and a second inductive proximity sensor for detecting the second metal baffle,

[0010] A controller is connected to the first inductive proximity sensor and the second inductive proximity sensor,

[0011] Actuator, connected to the controller;

[0012] The first metal baffle and the second metal baffle are respectively arranged at the two end edges of the coupling. The distance between the first inductive proximity sensor and the straight line where the coupling axis is located is greater than the radius of one end of the coupling on which the first metal baffle is installed. The distance between the second inductive proximity sensor and the straight line where the coupling axis is located is greater than the radius of one end of the coupling on which the second metal baffle is installed.

[0013] When the coupling of the device is in a non-slip state, when the first metal blocking piece is aligned with the first inductive proximity sensor, the second metal blocking piece is aligned with the second inductive proximity sensor.

[0014] The controller includes:

[0015] a differential amplifier having input terminals connected to the first inductive proximity sensor and the second inductive proximity sensor, respectively, and configured to send a slip signal when outputs of the first inductive proximity sensor and the second inductive proximity sensor are inconsistent;

[0016] The PLC master control is connected to the differential amplifier and the differential amplifier, and is configured to control the actuator to operate after receiving the slip signal.

[0017] A pulse trigger latch is provided between the differential amplifier and the PLC main control.

[0018] The actuator includes a buzzer.

[0019] The actuator includes a warning LED light.

[0020] The arc of the first metal baffle is π / 180 to 5π / 180.

[0021] The arc of the first metal baffle is 2π / 180.

[0022] The arc of the second metal blocking piece is π / 180 to 5π / 180.

[0023] The arc of the second metal baffle is 2π / 180.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1) By providing a metal baffle and an inductive proximity sensor, the metal baffle can be captured by the inductive proximity sensor during the operation of the coupling, thereby accurately detecting slippage.

[0026] 2) Using differential amplifier to achieve synchronous comparison of signals with high reliability and high precision.

[0027] 3) The arc of the metal baffle is 2π / 180, which can improve accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 is a schematic diagram of the controller;

[0030] Figure 3 Schematic diagram of the relationship between the output signals of two inductive proximity sensors and the accumulated slip displacement;

[0031] Figure 4 This is a schematic diagram of the output signal of the differential amplifier during slipping;

[0032] Among them: 1. first metal baffle, 2. first inductive proximity sensor, 3. coupling, 4. torque overload protection mechanism, 5. second metal baffle, 6. second inductive proximity sensor, 7. controller, 71. differential amplifier, 72. pulse trigger latch, 73. PLC master control. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0034] An online monitoring device for the slip displacement of a wind turbine coupling, wherein a torque overload protection mechanism is installed in the coupling 3, such as Figure 1 As shown, the equipment includes:

[0035] A first metal baffle 1 and a first inductive proximity sensor 2 for detecting the first metal baffle 1,

[0036] The second metal baffle 5 and the second inductive proximity sensor 6 for detecting the second metal baffle 5,

[0037] The controller 7 is connected to the first inductive proximity sensor 2 and the second inductive proximity sensor 6, respectively.

[0038] Actuator 8, connected to controller 7;

[0039] The first metal baffle 1 and the second metal baffle 5 are respectively arranged at the two end edges of the coupling 3. The distance between the first inductive proximity sensor 2 and the straight line on which the axis of the coupling 3 is located is greater than the radius of the end of the coupling 3 where the first metal baffle 1 is installed. The distance between the second inductive proximity sensor 6 and the straight line on which the axis of the coupling 3 is located is greater than the radius of the end of the coupling 3 where the second metal baffle 5 is installed.

[0040] By providing the metal baffle and the inductive proximity sensor, the metal baffle can be captured by the inductive proximity sensor during the operation of the coupling 3, thereby accurately detecting slippage.

[0041] In this embodiment, when the coupling is not slipping, when the first metal baffle 1 is aligned with the first inductive proximity sensor 2, the second metal baffle 5 is aligned with the second inductive proximity sensor 6. In this way, the design of the controller 7 can be simplified and implemented in a pure hardware manner, such as Figure 2 As shown, the controller 7 includes:

[0042] a differential amplifier 71 , having input terminals connected to the first inductive proximity sensor 2 and the second inductive proximity sensor 6 , respectively, and configured to send a slip signal when outputs of the first inductive proximity sensor 2 and the second inductive proximity sensor 6 are inconsistent;

[0043] The PLC master 73 is connected to the differential amplifier 711 and the differential amplifier 711 and is configured to control the actuator to operate after receiving the slip signal.

[0044] Specifically, when the outputs of the first inductive proximity sensor 2 and the second inductive proximity sensor 6 are consistent, the output of the differential amplifier 71 is a low level, indicating that there is no slip. When the outputs of the first inductive proximity sensor 2 and the second inductive proximity sensor 6 are inconsistent, the output of the differential amplifier 71 is a high level, indicating that slip has occurred. At this time, after receiving the high level, the PLC main control 73 outputs a high level to the actuator 8. Based on this, this embodiment greatly improves the accuracy of slip monitoring and achieves both low missed alarm rate and false alarm rate.

[0045] In other embodiments, a pulse-triggered latch 72 may be provided between the differential amplifier 71 and the PLC master control 73 .

[0046] In this embodiment, the actuator 8 includes a buzzer and an alarm LED light. The arc of the first metal baffle 1 is 2π / 180, and the arc of the second metal baffle 5 is 2π / 180.

[0047] In other embodiments, the radian of the first metal blocking piece 1 is any value between π / 180 and 5π / 180. Similarly, the radian of the second metal blocking piece 5 is any value between π / 180 and 5π / 180.

[0048] In another embodiment, in order to reduce the sensitivity of the alarm, the PLC master 73 can be developed with software instead of simply controlling the actuator according to the high level. Figure 3 As shown, when slip occurs, as the displacement accumulates, under the condition of constant speed, the output signals of the first inductive proximity sensor 2 and the second inductive proximity sensor 6 will gradually decrease with the accumulation of displacement, corresponding to the following Figure 4 The output of the differential amplifier 71, the ratio of the width of the high level to the width of the low level between the high level will become larger. Therefore, by calculating this ratio, when the ratio exceeds the set threshold, the PLC master control 73 will output a high level to the actuator 8 again.

Claims

1. An online monitoring device for slip displacement of a wind turbine coupling, wherein a torque overload protection mechanism is installed in the coupling (3), characterized in that: The device comprises: a first metal baffle (1) and a first inductive proximity sensor (2) for detecting the first metal baffle (1), a second metal baffle (5) and a second inductive proximity sensor (6) for detecting the second metal baffle (5), The controller (7) is connected to the first inductive proximity sensor (2) and the second inductive proximity sensor (6), respectively. Actuator (8), connected to controller (7); The first metal baffle (1) and the second metal baffle (5) are respectively arranged at the two end edges of the coupling (3); the distance between the first inductive proximity sensor (2) and the straight line on which the axis of the coupling (3) is located is greater than the radius of the end of the coupling (3) on which the first metal baffle (1) is installed; and the distance between the second inductive proximity sensor (6) and the straight line on which the axis of the coupling (3) is located is greater than the radius of the end of the coupling (3) on which the second metal baffle (5) is installed; The controller (7) comprises: A differential amplifier (71), having input terminals connected to the first inductive proximity sensor (2) and the second inductive proximity sensor (6), and configured to send a slip signal when outputs of the first inductive proximity sensor (2) and the second inductive proximity sensor (6) are inconsistent; A PLC master (73), connected to the differential amplifier (71), is configured to control the actuator to operate after receiving the slip signal; A pulse trigger latch (72) is provided between the differential amplifier (71) and the PLC main control (73).

2. The on-line monitoring device for slip displacement of a wind turbine coupling according to claim 1, characterized in that: When the coupling of the device is in a non-slip state, when the first metal baffle (1) is aligned with the first inductive proximity sensor (2), the second metal baffle (5) is aligned with the second inductive proximity sensor (6).

3. The on-line monitoring device for slip displacement of a wind turbine coupling according to claim 1, characterized in that: The actuator (8) includes a buzzer.

4. The on-line monitoring device for slip displacement of a wind turbine coupling according to claim 1, characterized in that: The actuator (8) includes an alarm LED light.

5. The on-line monitoring device for slip displacement of a wind turbine coupling according to claim 1, characterized in that: The arc of the first metal baffle (1) is π / 180 to 5π / 180.

6. The on-line monitoring device for slip displacement of a wind turbine coupling according to claim 5, characterized in that: The arc of the first metal baffle (1) is 2π / 180.

7. The on-line monitoring device for slip displacement of a wind turbine coupling according to claim 1, characterized in that: The arc of the second metal baffle (5) is π / 180 to 5π / 180.

8. The on-line monitoring device for slip displacement of a wind turbine coupling according to claim 7, characterized in that: The arc of the second metal baffle (5) is 2π / 180.

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