Slot wedge tightness positioning detection device

Abstract

The utility model provides a slot wedge tightness degree positioning detection device, the device comprises a frame structure and a host computer, the frame structure is provided with an excitation module, a sound acquisition module, a motion module, a communication module and a control mainboard, the excitation module and the motion module are respectively electrically connected with the control mainboard, the control mainboard is in signal connection with the communication module, and the host computer is in signal connection with the communication module. The communication module and the sound collection module are in signal connection with the upper computer, the sound collection module is used for collecting sound signals generated when the excitation module knocks the slot wedge, and the motion module is arranged at the bottom of the frame structure and used for driving the frame structure to move. The stator slot wedge detection device can enter a stator and rotor air gap under the condition that a rotor of a generator is not pulled out, the stator slot wedge is effectively positioned and detected, and the problem of stator slot wedge detection is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of motor monitoring technology, and in particular to a slot wedge tightness positioning and detection device. Background Technology

[0002] Stator slot wedges are structures used to fix the stator bars within the stator slots. The stator is a key component in a steam turbine generator that achieves magneto-electric energy conversion, and the stator bars are the medium for generating and transmitting electrical energy. Stator slot wedges use insulating materials to prevent the stator bars from vibrating and displacing due to electromagnetic forces and other forces during operation, thus avoiding damage to the stator bar insulation. Loosening of the stator bars will cause poor local heat dissipation, resulting in abnormal temperature rises. The combined effects of vibration, thermal stress, and alternating electromagnetic forces cause the bars to repeatedly squeeze and rub against the slot wedges, leading to insulation damage, exacerbating discharge corrosion and vibration within the slots, and simultaneously affecting adjacent slot wedges, amplifying the impact and creating a vicious cycle. Loosening of the stator slot wedges will lead to a decrease in generator performance, and in severe cases, cause the generator to fail to operate stably. Therefore, detecting the tightness of the stator slot wedges is crucial.

[0003] Currently, the tightness of stator slot wedges is mainly tested using manual tapping, hardness or displacement testing, and acoustic spectrum analysis. Large steam turbine generators have numerous stator wedge slots, making manual inspection time-consuming, labor-intensive, and inaccurate. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a slot wedge tightness positioning and detection device, which can accurately diagnose generator stator slot wedge tightness faults by positioning and tapping the stator slot wedge.

[0005] To achieve the above objectives, this utility model provides a slot wedge tightness positioning and detection device. The device includes a frame structure and a host computer. The frame structure is equipped with a vibration module, a sound acquisition module, a motion module, a communication module, and a control motherboard. The vibration module and the motion module are electrically connected to the control motherboard, and the control motherboard is signal-connected to the communication module. The communication module and the sound acquisition module are signal-connected to the host computer. The sound acquisition module is used to acquire the sound signal generated by the vibration module striking the slot wedge. The motion module is located at the bottom of the frame structure and is used to drive the frame structure to move.

[0006] Furthermore, the frame structure includes at least a chassis and a shell, wherein the chassis and the shell are detachably connected.

[0007] Furthermore, the vibration module includes an electric telescopic rod and a striking head. The fixed end of the electric telescopic rod is located at the top of the middle part of the housing and is used to drive the striking head to strike the groove wedge. The middle part of the chassis has a channel through which the electric telescopic rod and the striking head can pass. The striking head is fixedly connected to the telescopic end of the electric telescopic rod and is used to strike the groove wedge. The electric telescopic rod is electrically connected to the control main board.

[0008] Furthermore, the excitation module also includes a positioning unit, a camera, and a fill light. The positioning unit is connected to the control motherboard via signals, and the camera and fill light are electrically connected to the control motherboard. The camera and fill light are respectively located at the front end of the housing, and the positioning unit is located inside the frame structure. The positioning unit is used to locate the position of the detection device, the camera is used to capture the striking position of the excitation module, and the fill light is used to provide supplementary lighting for the camera.

[0009] Furthermore, the camera and fill light are provided at both the front and rear ends of the chassis.

[0010] Furthermore, the sound acquisition module includes an RF unit, a microphone, and an acquisition card. The microphone is connected to the acquisition card for acquiring the sound emitted by the excitation module. The acquisition card is connected to the RF unit for converting the analog signal acquired by the microphone into a digital signal. The RF unit is connected to the host computer for transmitting the digital signal converted by the acquisition card to the host computer.

[0011] Furthermore, the motion module includes a driver, a motor, and a track. The driver is electrically connected to the motor and is respectively located above the chassis. It is used to control the start and stop of the motor. The motor is used to drive the track to move. The track is located inside the outer shell. The driver is electrically connected to the control main board.

[0012] Furthermore, the track is a magnetically adsorbed track.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model provides a slot wedge tightness positioning and detection device, which can automatically move to the target slot wedge under the drive of the motion module, so that the control motherboard can control the excitation module to smoothly strike the target slot wedge to generate a sound signal. The sound acquisition module collects the sound signal generated by the excitation module striking the target slot wedge and sends it directly to the host computer, avoiding the loss of sound signal in secondary transmission, ensuring the correct identification of the slot wedge tightness, and effectively solving the problem of stator slot wedge detection. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This utility model provides a slotted wedge tightness positioning and detection device according to Embodiment 1. Left sectional side view intention ;

[0017] Figure 2 This utility model provides a slotted wedge tightness positioning and detection device according to Embodiment 1. Right sectional side view intention ;

[0018] Figure 3 This is a groove wedge tightness positioning and detection device provided in Embodiment 2 of this utility model. Left sectional side view intention ;

[0019] In the diagram, 1 is the chassis, 2 is the outer shell, 3 is the communication module, 4 is the control motherboard, 5 is the electric telescopic rod, 6 is the striking head, 7 is the positioning unit, 8 is the camera, 9 is the supplementary light, 10 is the radio frequency unit, 11 is the acquisition card, 12 is the microphone, 13 is the driver, 14 is the motor, and 15 is the track. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0021] Example 1

[0022] Reference Figure 1 and Figure 2 This embodiment provides a slot wedge tightness positioning and detection device. The device includes a frame structure and a host computer. The frame structure is provided with a vibration module, a sound acquisition module, a motion module, a communication module 3, and a control motherboard 4. The vibration module and the motion module are electrically connected to the control motherboard 4, and the control motherboard 4 is signal connected to the communication module 3. The communication module 3 and the sound acquisition module are signal connected to the host computer. The sound acquisition module is used to acquire the sound signal generated by the vibration module striking the slot wedge. The motion module is located at the bottom of the frame structure and is used to drive the frame structure to move.

[0023] The device is controlled by a motion module controlled by a main board 4, which moves the frame structure to the target wedge. The main board 4 controls a vibration module to strike the target wedge. The sound acquisition module collects the sound emitted by the struck wedge and sends the collected sound signal to the host computer. The communication module 3 is responsible for the communication between the main board 4 and the host computer.

[0024] In a preferred embodiment, the frame structure includes at least a chassis 1 and a housing 2, wherein the chassis 1 and the housing 2 are detachably connected. In this embodiment, the frame structure is further defined. It is known that the detection device needs to be equipped with a vibration module, a sound acquisition module, a motion module, a communication module 3, and a control motherboard 4. If the frame structure of the device does not include a chassis and a housing, the overall stability of the device will be greatly reduced, making it prone to deformation or damage during operation. The wear and tear on the vibration module, sound acquisition module, motion module, communication module 3, and control motherboard 4, which are located within the frame structure, will also increase. Therefore, the frame structure must at least include a chassis 1 and a housing 2 to protect the vibration module, sound acquisition module, motion module, communication module 3, and control motherboard 4 located within the frame structure.

[0025] In a preferred embodiment, the vibration module includes an electric telescopic rod 5 and a striking head 6. The fixed end of the electric telescopic rod 5 is located at the top of the middle part of the housing 2 and is used to drive the striking head 6 to strike the groove wedge. A channel is provided in the middle of the chassis 1 through which the electric telescopic rod 5 and the striking head 6 can pass. The striking head 6 is fixedly connected to the telescopic end of the electric telescopic rod 5 and is used to strike the groove wedge. The electric telescopic rod 5 is electrically connected to the control main board 4.

[0026] Since the depth of the slot wedge varies among different generator models, the vibration module of this invention's testing device controls the electric telescopic rod 5 via the control motherboard 4 to move the striking head 6 up and down, thereby achieving an adjustable striking distance. Before testing, the electric telescopic rod 5 is adjusted to drive the striking head 6 to a suitable striking height according to the generator model. The striking frequency can be set according to the actual situation, and this invention does not limit this. The electric telescopic rod 5 requires a certain amount of space when extending and retracting. If it is directly placed on the chassis, it will affect the movement of the device. Therefore, this invention places the electric telescopic rod 5 in the middle of the inner top of the frame structure shell. During the movement of the device, the electric telescopic rod 5 remains in a retracted state. When the device moves to the target slot wedge, the control motherboard 4 controls the electric telescopic rod 5 to strike according to the depth of the target slot wedge. An opening is provided in the middle of the chassis 1 so that the electric telescopic rod 5 can smoothly drive the striking head 6 to strike the target slot wedge.

[0027] In a preferred embodiment, the sound acquisition module includes an RF unit 10, a microphone 12, and an acquisition card 11. The microphone 12 is signal-connected to the acquisition card 11 and is used to acquire the sound emitted by the excitation module. The acquisition card 11 is signal-connected to the RF unit 10 and is used to convert the analog signal acquired by the microphone 12 into a digital signal. The RF unit 10 is signal-connected to the host computer and is used to transmit the digital signal converted by the acquisition card 11 to the host computer for further analysis.

[0028] To detect the tightness of the slot wedge, collecting the sound emitted when the target slot wedge is struck is an essential step. In this embodiment, microphone 12 is used to collect the sound signal emitted by the vibration module striking the target slot wedge. The acquisition card 11 has a high sampling rate, which can accurately convert the sound signal collected by microphone 12 into a digital signal that can be processed by the host computer. The radio frequency unit 10 has excellent transmission performance, which can stably transmit the digital signal converted by acquisition card 11 to the host computer.

[0029] In a preferred embodiment, the motion module includes a driver 13, a motor 14, and a track 15. The driver 13 is electrically connected to the motor 14 and is respectively located above the chassis 1. The driver 13 controls the start and stop of the motor 14. The motor 14 drives the track 15 to move. The track 15 is located inside the housing 2. The driver 13 is electrically connected to the control mainboard 4. In this embodiment, the control mainboard 4 controls the driver 13 to drive the motor 14 to rotate. The output shaft of the motor 14 is connected to the track 15, thereby moving the device to the target slot wedge. To ensure that the device can smoothly enter the stator-rotor air gap of the generator, the track 15 is located inside the housing 2.

[0030] The track 15 is a magnetically attached track. In this embodiment, the magnetically attached track on a vertical and non-planar surface can stably attach the device to the moving surface when the device moves, thereby achieving more accurate striking of the target wedge.

[0031] Example 2

[0032] Based on the foregoing embodiments, the difference between this embodiment and the foregoing embodiments is as follows:

[0033] Reference Figure 3 In a preferred embodiment, the vibration module further includes a positioning unit 7, a camera 8, and a supplementary light 9. The positioning unit 7 is signal-connected to the control motherboard 4, and the camera 8 and the supplementary light 9 are electrically connected to the control motherboard 4. The camera 8 and the supplementary light 9 are respectively located at the front end of the housing 2, and the positioning unit 7 is located inside the frame structure. The positioning unit 7 is used to locate the position of the detection device, the camera 8 is used to capture the striking position of the vibration module, and the supplementary light 9 is used to provide supplementary light for the camera 8.

[0034] To address the issue of inaccurate strike point determination when striking the target wedge, this embodiment includes a positioning unit 7, a camera 8, and a supplementary light 9. The positioning unit 7 sends the exact location of the device striking the target wedge to the host computer via the control motherboard 4. The control motherboard 4 then controls the camera 8 to capture images during the strike and sends these images to the host computer. Since the light inside the wedge is weak, a supplementary light 9 is placed next to the camera 8 to provide illumination during image capture. The aiming position of the camera 8 can be adjusted based on actual conditions to ensure it captures clear images; this embodiment does not impose any limitations.

[0035] In a preferred embodiment, the camera 8 and the supplementary light 9 are provided at both the front and rear ends of the chassis 1. In order to accurately locate the striking position of the detection device, cameras and supplementary lights aligned with the striking groove wedge position are provided at both the front and rear ends of the chassis 1.

[0036] In the above embodiments, the communication module, control motherboard, electric telescopic pole, positioning unit, camera, supplementary light, radio frequency unit, acquisition card, microphone, driver, motor and track can all be existing products on the market. Their internal circuit connections and power supply settings are conventional technical means for those skilled in the art, and their connection methods and principles will not be specifically described here.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for detecting the tightness of a slotted wedge, characterized in that, The device includes a frame structure and a host computer. The frame structure is equipped with a vibration excitation module, a sound acquisition module, a motion module, a communication module, and a control motherboard. The vibration excitation module and the motion module are electrically connected to the control motherboard, and the control motherboard is signal-connected to the communication module. The communication module and the sound acquisition module are signal-connected to the host computer. The sound acquisition module is used to acquire the sound signal generated by the vibration module striking the slot wedge. The motion module is located at the bottom of the frame structure and is used to drive the frame structure to move.

2. The slotted wedge tightness positioning and detection device according to claim 1, characterized in that, The frame structure includes at least a chassis and an outer shell, and the chassis and the outer shell are detachably connected.

3. The slotted wedge tightness positioning and detection device according to claim 2, characterized in that, The vibration module includes an electric telescopic rod and a striking head. The fixed end of the electric telescopic rod is located at the top of the middle part of the housing and is used to drive the striking head to strike the groove wedge. The middle part of the chassis has a channel through which the electric telescopic rod and the striking head can pass. The striking head is fixedly connected to the telescopic end of the electric telescopic rod and is used to strike the groove wedge. The electric telescopic rod is electrically connected to the control main board.

4. The slotted wedge tightness positioning and detection device according to claim 2, characterized in that, The vibration module also includes a positioning unit, a camera, and a fill light. The positioning unit is connected to the control motherboard via signals, and the camera and fill light are electrically connected to the control motherboard. The camera and fill light are respectively located at the front end of the housing. The positioning unit is located inside the frame structure. The positioning unit is used to locate the position of the detection device, the camera is used to capture the impact position of the vibration module, and the fill light is used to provide supplementary lighting for the camera.

5. The slot wedge tightness positioning and detection device according to claim 4, characterized in that, The camera and fill light are installed at both the front and rear ends of the chassis.

6. The slotted wedge tightness positioning and detection device according to claim 1, characterized in that, The sound acquisition module includes an RF unit, a microphone, and an acquisition card. The microphone is connected to the acquisition card for acquiring the sound emitted by the excitation module. The acquisition card is connected to the RF unit for converting the analog signal acquired by the microphone into a digital signal. The RF unit is connected to the host computer for transmitting the digital signal converted by the acquisition card to the host computer.

7. The slotted wedge tightness positioning and detection device according to claim 2, characterized in that, The motion module includes a driver, a motor, and tracks. The driver is electrically connected to the motor and is located on the chassis. It is used to control the start and stop of the motor. The motor is used to drive the tracks to move. The tracks are located inside the outer shell. The driver is electrically connected to the control main board.

8. The slot wedge tightness positioning and detection device according to claim 7, characterized in that, The track is a magnetically adsorbed track.

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