Rotating speed measuring device and rotating speed measuring method for water-turbine generator set

Abstract

The invention relates to the technical field of rotating speed measurement, in particular to a rotating speed measuring device and method for a water-turbine generator set, and the device comprises a monitoring mechanism which comprises a housing, an operation screen adaptively installed on the outer side of the housing, and a display screen adaptively installed on the outer side of the housing. An acquisition part is arranged on the outer side of the shell; a non-contact rotating speed measuring method is adopted, a unit body does not need to be additionally installed and transformed, rotating speed measuring equipment and the water-turbine generator set are physically isolated, the distance between the rotating speed measuring equipment and the water-turbine generator set is long, vibration influence caused by operation of the water-turbine generator set is avoided, and extra risk factors are greatly reduced; when the camera needs to be adjusted or protected, the height of the camera can be adjusted only by pressing and rotating the rotating ring, after adjustment is completed, even if someone mistakenly touches the rotating ring to enable the rotating ring to rotate, the threaded sleeve cannot be driven to rotate, and it is ensured that the device has the self-locking effect.

Description

Technical Field

[0001] This invention relates to the field of speed measurement technology, and in particular to a speed measuring device and method for a hydro-generator set. Background Technology

[0002] Accurate measurement of the speed signal of a hydro-generator unit is crucial for improving the stability of the unit's control system and the power grid. Currently, there are two main methods for measuring the speed of hydro-generator units: one is the PT (potential transformer) speed measurement method, which calculates the speed by collecting the output voltage frequency using a voltage transformer; the other is a speed measurement method that uses a geared disc mounted on the shaft to capture pulses. In practical applications, the PT speed measurement method is prone to speed measurement anomalies and failures due to factors such as fuse blowouts, loose connections and poor contact, circuit breaker burnout, secondary overload, and insulation degradation. The geared disc speed measurement method requires the addition of mechanical structures and signal sensors to the unit. It is susceptible to mechanical failures due to shaft vibration, and the signal interface is prone to problems such as loose connections and poor circuit contact. Furthermore, the speed measurement accuracy of the geared disc method is relatively low at low speeds.

[0003] Furthermore, during the overhaul of hydro-generator units, power outage maintenance is typically employed, and exposed cameras are protected to prevent accidental contact during maintenance. Additionally, some cameras monitoring unit rotation require manual adjustment for maintenance, protection, and testing during the overhaul. However, current camera protection requires separate protective housings, and manually adjustable cameras require locking the control levers to ensure stability after adjustment. However, locking is inconvenient in actual operation. Summary of the Invention

[0004] In view of the problems of unstable contact speed measurement and inconvenient camera protection and locking after adjustment in the above-mentioned prior art, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a hydro-generator set speed measuring device.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hydro-generator unit speed measuring device, comprising,

[0007] The monitoring device includes a housing, an operating panel adapted to be installed on the outside of the housing, and a display screen adapted to be installed on the outside of the housing. An inspection door is rotatably connected to the outside of the housing, and a data acquisition component is provided on the outside of the housing.

[0008] As a preferred embodiment of the turbine generator set speed measuring device of the present invention, the acquisition component includes a mounting plate bolted to the outside of the housing, a protective block fixedly connected to the outside of the mounting plate, and a protective cavity opened at the top of the protective block. The protective block is provided with a shooting component inside, an operating component is adapted to be installed at the bottom of the protective block, and a limit component is adapted to be installed at the bottom of the protective block.

[0009] As a preferred embodiment of the turbine generator set speed measuring device of the present invention, the protective block is rotatably connected to a threaded sleeve, a threaded rod that is threadedly connected to the inside of the threaded sleeve, and a camera disposed at the top of the threaded rod. A slot is provided at the bottom of the inside of the threaded sleeve, and a friction ring is fixedly connected to the outside of the threaded sleeve.

[0010] The friction ring has a vertical friction pattern, and the threaded rod is slidably connected to the protective block.

[0011] In a preferred embodiment of the turbine generator set speed measuring device of the present invention, the operating component includes a transmission rod rotatably connected to the bottom end of the threaded sleeve, a chuck fixedly connected to the top end of the transmission rod, and a truncated cone fixedly connected to the bottom end of the transmission rod. A rotating ring is fixedly connected to the outer side of the truncated cone, a return spring is sleeved on the outer side of the transmission rod, and a trigger is provided at the top end of the truncated cone.

[0012] In a preferred embodiment of the turbine generator set speed measuring device of the present invention, the triggering element includes a pressure ring fixedly connected to the top of the truncated cone, and a protrusion fixedly connected to the outside of the pressure ring, wherein the protrusion is made of rubber.

[0013] As a preferred embodiment of the turbine generator set speed measuring device of the present invention, the limiting component includes a hinge seat fixedly connected to the bottom end of the protective block, a rotating shaft rotatably connected to the inner side of the hinge seat, and a connecting rod fixedly connected to the outer side of the rotating shaft. A friction plate is fixedly connected to the top end of the connecting rod, and the friction pattern of the friction plate is designed vertically.

[0014] In a preferred embodiment of the turbine generator set speed measuring device of the present invention, the limiting component further includes a bent rod fixedly connected to the outside of the rotating shaft, a groove formed on the outside of the bent rod, and a torsion spring disposed inside the rotating shaft, wherein the rotating shaft is connected to the hinge seat through the torsion spring.

[0015] As a preferred embodiment of the turbine generator set speed measuring device of the present invention, the housing is further provided with a PLC main controller, an interface conversion unit and a storage battery.

[0016] The PLC main controller, interface conversion unit, battery, operation panel, display screen and camera are electrically connected to each other.

[0017] The present invention also provides a method for measuring rotational speed.

[0018] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: a speed measurement method, including the aforementioned hydro-generator set speed measuring device, including the unit LCU, and the following steps:

[0019] S101, draw blue circular patterns evenly on the side wall of the hydro-generator unit; and calculate in advance the viewing angle n of the camera to the side wall of the hydro-generator unit;

[0020] S102: Obtain the status of the latest LCU speed measurement command of the hydro-generator unit. If the unit's LCU sends a speed measurement command, start speed measurement. If the unit sends a stop speed measurement command, end the speed measurement operation.

[0021] S103, when starting the rotation speed measurement, if there is a blue circle on the screen, the operation will not proceed; when the blue circle rotates out of the screen and there is no blue circle on the screen, the operation will begin; when the blue circle reappears on the screen, the time will be recorded.

[0022] S104: Do not process the blue circle while it remains in the image; continue to observe the position of the blue circle.

[0023] S105, record the time when the blue circular random group rotates out of the screen.

[0024] As a preferred embodiment of the rotational speed measurement method of the present invention, the formula for calculating the rotational angular velocity of the hydro-generator unit is:

[0025]

[0026] The beneficial effects of this invention are:

[0027] The non-contact speed measurement method eliminates the need for any additions or modifications to the generator set. The speed measurement equipment is physically isolated from the turbine generator set and is located at a considerable distance, thus avoiding the impact of vibrations caused by the generator set's operation and greatly reducing additional risk factors.

[0028] When the camera needs to be adjusted or protected, simply press and rotate the ring until the camera is completely inside the protective cavity. Similarly, the height of the camera can be adjusted by pressing and rotating the ring. After adjustment, even if someone accidentally touches the ring and causes it to rotate, it will not be able to drive the threaded sleeve to rotate, ensuring that the device has a self-locking effect. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0030] Figure 1 This is a schematic diagram of the overall invention.

[0031] Figure 2 This is an enlarged schematic diagram of part A of the present invention.

[0032] Figure 3 This is a schematic diagram of the interior of the present invention.

[0033] Figure 4 This is a schematic diagram of the internal structure of the present invention.

[0034] Figure 5 This is a cross-sectional schematic diagram of the present invention.

[0035] Figure 6 This is an enlarged schematic diagram of part B of the present invention.

[0036] Figure 7 This is a schematic diagram of the internal structure of the rotating shaft of the present invention.

[0037] Figure 8 This is a schematic diagram of the rotational speed measurement method of the present invention.

[0038] Figure 9 This is a flowchart of the rotational speed measurement method of the present invention. Detailed Implementation

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0040] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0042] Example 1

[0043] Reference Figures 1 to 7 This is the first embodiment of the present invention, which provides a hydro-generator set speed measuring device, comprising,

[0044] The monitoring device 100 includes a housing 101, an operating panel 102 adapted to be installed on the outside of the housing 101, and a display screen 103 adapted to be installed on the outside of the housing 101. An inspection door 104 is rotatably connected to the outside of the housing 101, and a data acquisition component 105 is provided on the outside of the housing 101.

[0045] Specifically, the acquisition component 105 includes a mounting plate 105a bolted to the outside of the housing 101, a protective block 105b fixedly connected to the outside of the mounting plate 105a, and a protective cavity 105c opened at the top of the protective block 105b. The inside of the protective block 105b is provided with a shooting component 105d, an operating component 105e is adapted to be installed at the bottom of the protective block 105b, and a limiting component 105f is adapted to be installed at the bottom of the protective block 105b.

[0046] Furthermore, the protective block 105b is internally rotatably connected to a threaded sleeve 105d-1, a threaded rod 105d-2 that is internally threaded to the threaded sleeve 105d-1, and a camera 105d-3 located at the top of the threaded rod 105d-2. The bottom of the threaded sleeve 105d-1 is provided with a slot 105d-4, and a friction ring 105d-5 is fixedly connected to the outside of the threaded sleeve 105d-1.

[0047] Among them, the friction ring 105d-5 has a vertical friction pattern, and the threaded rod 105d-2 is slidably connected to the protective block 105b.

[0048] Preferably, the operating component 105e includes a transmission rod 105e-1 rotatably connected to the bottom end of the threaded sleeve 105d-1, a chuck 105e-2 fixedly connected to the top end of the transmission rod 105e-1, and a frustum 105e-3 fixedly connected to the bottom end of the transmission rod 105e-1. A rotating ring 105e-4 is fixedly connected to the outer side of the frustum 105e-3. A return spring 105e-5 is sleeved on the outer side of the transmission rod 105e-1. A trigger element 105e-6 is provided at the top end of the frustum 105e-3.

[0049] It should be noted that the trigger 105e-6 includes a pressure ring 105e-6a fixedly connected to the top of the frustum 105e-3, and a protrusion 105e-6b fixedly connected to the outside of the pressure ring 105e-6a. The protrusion 105e-6b is made of rubber.

[0050] When using the camera 105d-3, to protect it, first press the rotating ring 105e-4 upwards, which will move the transmission rod 105e-1 at the top of the frustum 105e-3 and the locking head 105e-2 at the top of the transmission rod 105e-1 until the locking head 105e-2 is inserted into the slot 105d-4. The return spring 105e-5 will be compressed and contracted. Then, rotate the rotating ring 105e-4. The rotation of the rotating ring 105e-4 will cause the locking head 105e-2 to engage with the slot 105d-4, which will cause the threaded sleeve 105d-1 to rotate. The rotation of the threaded sleeve 105d-1 will then cause the camera 105d-3 at the top of the threaded rod 105d-2 to adjust its position.

[0051] Therefore, when it is necessary to protect the camera 105d-3, simply press and rotate the rotating ring 105e-4 until the camera 105d-3 is completely inside the protective cavity 105c. Similarly, pressing and rotating the rotating ring 105e-4 can adjust the height of the camera 105d-3, ensuring that the camera 105d-3 is in the optimal position during actual use. After adjustment, release the rotating ring 105e-4. Under the elasticity of the return spring 105e-5, the rotating ring 105e-4 will be reset, and the locking head 105e-2 will separate from the locking slot 105d-4. This ensures that even if someone accidentally touches the rotating ring 105e-4 and causes it to rotate, the threaded sleeve 105d-1 cannot be rotated, ensuring that the device has a self-locking effect.

[0052] In summary, when it is necessary to adjust or protect the camera 105d-3, simply press and rotate the rotating ring 105e-4 until the camera 105d-3 is completely inside the protective cavity 105c. Similarly, by pressing and rotating the rotating ring 105e-4, the height of the camera 105d-3 can be adjusted. After adjustment, even if someone accidentally touches the rotating ring 105e-4 and causes it to rotate, it will not be able to drive the threaded sleeve 105d-1 to rotate, ensuring that the device has a self-locking effect.

[0053] Example 2

[0054] Reference Figures 1 to 7 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a limiting component 105f, including a hinge seat 105f-1 fixedly connected to the bottom end of the protective block 105b, a rotating shaft 105f-2 rotatably connected to the inner side of the hinge seat 105f-1, and a connecting rod 105f-3 fixedly connected to the outer side of the rotating shaft 105f-2. A friction plate 105f-4 is fixedly connected to the top end of the connecting rod 105f-3, and the friction texture of the friction plate 105f-4 is designed vertically.

[0055] Specifically, the limiting assembly 105f also includes a bent rod 105f-5 fixedly connected to the outside of the rotating shaft 105f-2, a groove 105f-6 opened on the outside of the bent rod 105f-5, and a torsion spring 105f-7 disposed inside the rotating shaft 105f-2. The rotating shaft 105f-2 is connected to the hinge seat 105f-1 through the torsion spring 105f-7.

[0056] While pressing the rotating ring 105e-4, the pressure ring 105e-6a at the top of the frustum 105e-3 will slide, causing the sliding pressure ring 105e-6a to press against the bottom end of the bent rod 105f-5. This pressure causes the bent rod 105f-5 to rotate inside the hinge seat 105f-1, causing the torsion spring 105f-7 inside the rotating shaft 105f-2 to deform. Simultaneously, the rotating shaft 105f-2 will drive... The friction plate 105f-4 at one end of the connecting rod 105f-3 rotates, causing the friction plate 105f-4 to separate from the friction ring 105d-5 on the outside of the threaded sleeve 105d-1. Thus, after pressing the rotating ring 105e-4, not only can the chuck 105e-2 be inserted into the slot 105d-4, but the friction plate 105f-4 can also be separated from the friction ring 105d-5, thereby ensuring that pressing the rotating ring 105e-4 can drive the threaded sleeve 105d-1 to rotate.

[0057] After the adjustment is completed and the rotating ring 105e-4 is released, the truncated cone 105e-3 can be reset under the elasticity of the return spring 105e-5. Then, under the elasticity of the torsion spring 105f-7, the rotating shaft 105f-2 will be reset. At this time, the clasp 105e-2 leaves the inside of the clasp slot 105d-4, and the friction plate 105f-4 contacts the friction ring 105d-5. Through the double self-locking design, the camera 105d-3 can be ensured after adjustment.

[0058] After resetting, the pressure ring 105e-6a will be located inside the groove 105f-6 of the bent rod 105f-5. Under the elasticity of the torsion spring 105f-7, it will ensure that the friction plate 105f-4 at one end of the connecting rod 105f-3 is in contact with the friction ring 105d-5, preventing the threaded sleeve 105d-1 from rotating. Under the elasticity of the reset spring 105e-5, the frustum 105e-3 will always be pressed downward, which will cause the pressure ring 105e-6a to be pressed downward inside the groove 105f-6 of the bent rod 105f-5. Under the action of the pressing force, the tightness of the contact between the friction plate 105f-4 and the friction ring 105d-5 can be further improved.

[0059] After the adjustment is completed and the rotating ring 105e-4 is released, the rotating ring 105e-4 can be actively rotated. The rotating ring 105e-4 drives the pressure ring 105e-6a at the top of the frustum 105e-3 to rotate, and causes the protrusion 105e-6b on the outer side of the pressure ring 105e-6a to press against the inside of the groove 105f-6. Under the action of compression, the tightness of the contact between the friction plate 105f-4 and the friction ring 105d-5 will be increased again, ensuring the overall stability of the equipment after adjustment.

[0060] In summary, this device presents different challenges in actual use:

[0061] During a major overhaul of the unit, simply press and rotate the rotating ring 105e-4 to adjust the camera 105d-3 to the required position, then release it to fix the position of the camera 105d-3. There is no need to release the rotating ring 105e-4 again and rotate it to lock it again. If the rotating ring 105e-4 is accidentally rotated at this time, it will cause the protrusion 105e-6b to press against the inner wall of the groove 105f-6. This will not only not cause the camera 105d-3 to be adjusted, but will also improve the stability of the camera 105d-3 after adjustment. Since the position of the camera 105d-3 does not need to be precisely adjusted during the overhaul, the step of releasing the rotating ring 105e-4 is reduced, making the operation easier.

[0062] During normal testing, after adjusting the camera 105d-3, rotate the loosened rotating ring 105e-4 to cause the protrusion 105e-6b to press against the inner wall of the groove 105f-6, further improving the tightness of contact between the friction plate 105f-4 and the friction ring 105d-5, ensuring that the positional accuracy will not change during use. At the same time, after the protrusion 105e-6b presses against the inner wall of the groove 105f-6, the frictional force that the rotating ring 105e-4 needs to overcome when accidentally touched increases. Also, even if the rotating ring 105e-4 is accidentally touched and rotated, it will not be able to adjust the position of the camera 105d-3. Another set of protrusions 105e-6b can be used to press against the inner wall of the groove 105f-6.

[0063] Example 3

[0064] Reference Figures 1-9 This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a speed measurement method, including a hydro-generator unit speed measurement device (LCU), and the following steps:

[0065] S101, draw blue circular patterns evenly on the side wall of the hydro-generator unit; and calculate in advance the viewing angle n of the camera to the side wall of the hydro-generator unit;

[0066] S102: Obtain the status of the latest LCU speed measurement command of the hydro-generator unit. If the unit's LCU sends a speed measurement command, start speed measurement. If the unit sends a stop speed measurement command, end the speed measurement operation.

[0067] S103, when starting the rotation speed measurement, if there is a blue circle on the screen, the operation will not proceed; when the blue circle rotates out of the screen and there is no blue circle on the screen, the operation will begin; when the blue circle reappears on the screen, the time will be recorded.

[0068] S104: Do not process the blue circle while it remains in the image; continue to observe the position of the blue circle.

[0069] S105, record the time when the blue circular random group rotates out of the screen.

[0070] Specifically, the formula for calculating the rotational angular velocity of a hydro-generator unit is as follows:

[0071]

[0072] Furthermore, the interior of housing 101 also houses a PLC main controller, an interface conversion unit, and a battery.

[0073] The PLC main controller, interface conversion unit, battery, operation panel 102, display screen 103 and camera 105d-3 are electrically connected to each other.

[0074] The interface conversion unit receives the speed algorithm input signal transmitted by the unit's LCU and sends the signal to the PLC main controller. The PLC main controller continuously acquires image information from the unit via a 105D-3 camera and processes it using the algorithm. Further, the PLC main controller transmits the calculated speed to the interface conversion unit, converts it into an analog signal, and sends it to the unit's LCU. Simultaneously, to ensure power supply stability, the PLC main controller collects real-time battery status information. Power can be cut off in case of abnormal status.

[0075] In summary, the non-contact speed measurement method eliminates the need for any additions or modifications to the generator set itself. The speed measurement equipment is physically isolated from the turbine generator set and is located at a considerable distance, thus avoiding the impact of vibrations caused by the unit's operation and greatly reducing additional risk factors.

[0076] Compared with traditional methods, this method is based entirely on the actual rotation of the main shaft for speed measurement. It does not rely on the voltage and pulse signals generated by the rotation and is not affected by factors such as signal level strength, electrical braking and electromagnetic interference, making it more reliable and stable.

[0077] It is installed far from the main unit, resulting in low maintenance costs and no impact on unit operation during maintenance.

[0078] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0079] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0080] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A speed measuring device for a hydro-generator set, characterized in that: include, The monitoring mechanism (100) includes a housing (101), an operation panel (102) adapted to be installed on the outside of the housing (101), and a display screen (103) adapted to be installed on the outside of the housing (101). An inspection door (104) is rotatably connected to the outside of the housing (101), and a data acquisition component (105) is provided on the outside of the housing (101).

2. The hydro-generator set speed measuring device as described in claim 1, characterized in that: The acquisition component (105) includes a mounting plate (105a) bolted to the outside of the housing (101), a protective block (105b) fixedly connected to the outside of the mounting plate (105a), and a protective cavity (105c) formed at the top of the protective block (105b). The protective block (105b) is equipped with a shooting component (105d), an operating component (105e) is adapted to be installed at the bottom of the protective block (105b), and a limiting component (105f) is adapted to be installed at the bottom of the protective block (105b).

3. The hydro-generator set speed measuring device as described in claim 2, characterized in that: The protective block (105b) is internally rotatably connected to a threaded sleeve (105d-1), a threaded rod (105d-2) that is threadedly connected to the inside of the threaded sleeve (105d-1), and a camera (105d-3) disposed at the top of the threaded rod (105d-2). The bottom of the inside of the threaded sleeve (105d-1) is provided with a slot (105d-4), and a friction ring (105d-5) is fixedly connected to the outside of the threaded sleeve (105d-1). The friction ring (105d-5) has a vertical friction pattern, and the threaded rod (105d-2) is slidably connected to the protective block (105b).

4. The hydro-generator set speed measuring device as described in claim 3, characterized in that: The operating component (105e) includes a transmission rod (105e-1) rotatably connected to the bottom end of the threaded sleeve (105d-1), a chuck (105e-2) fixedly connected to the top end of the transmission rod (105e-1), and a frustum (105e-3) fixedly connected to the bottom end of the transmission rod (105e-1). A rotating ring (105e-4) is fixedly connected to the outer side of the frustum (105e-3). A return spring (105e-5) is sleeved on the outer side of the transmission rod (105e-1). A trigger element (105e-6) is provided at the top end of the frustum (105e-3).

5. The hydro-generator set speed measuring device as described in claim 4, characterized in that: The trigger (105e-6) includes a pressure ring (105e-6a) fixedly connected to the top of the truncated cone (105e-3), and a protrusion (105e-6b) fixedly connected to the outside of the pressure ring (105e-6a), the protrusion (105e-6b) being made of rubber.

6. The hydro-generator unit speed measuring device as described in claim 4 or 5, characterized in that: The limiting component (105f) includes a hinge seat (105f-1) fixedly connected to the bottom end of the protective block (105b), a rotating shaft (105f-2) rotatably connected to the inner side of the hinge seat (105f-1), and a connecting rod (105f-3) fixedly connected to the outer side of the rotating shaft (105f-2). A friction plate (105f-4) is fixedly connected to the top end of the connecting rod (105f-3), and the friction pattern of the friction plate (105f-4) is designed vertically.

7. The hydro-generator set speed measuring device as described in claim 6, characterized in that: The limiting assembly (105f) also includes a bent rod (105f-5) fixedly connected to the outside of the rotating shaft (105f-2), a groove (105f-6) formed on the outside of the bent rod (105f-5), and a torsion spring (105f-7) disposed inside the rotating shaft (105f-2). The rotating shaft (105f-2) is connected to the hinge seat (105f-1) through the torsion spring (105f-7).

8. The hydro-generator set speed measuring device as described in claim 7, characterized in that: The housing (101) also contains a PLC main controller, an interface conversion unit, and a battery. The PLC main controller, interface conversion unit, battery, operation panel (102), display screen (103) and camera (105d-3) are electrically connected to each other.

9. A method for measuring rotational speed, characterized in that: The device includes the turbine generator speed measuring device according to any one of claims 1 to 8, comprising the generator unit LCU, and the following steps: S101, Blue circular patterns are evenly drawn on the side wall of the hydro-generator unit; And calculate in advance the viewing angle n of the camera to the side wall of the hydro-generator unit; S102: Obtain the status of the latest LCU speed measurement command of the hydro-generator unit. If the unit's LCU sends a speed measurement command, start speed measurement. If the unit sends a stop speed measurement command, end the speed measurement operation. S103, when starting the rotation speed measurement, if there is a blue circle on the screen, the operation will not proceed; when the blue circle rotates out of the screen and there is no blue circle on the screen, the operation will begin; when the blue circle reappears on the screen, the time will be recorded. S104: Do not process the blue circle while it remains in the image; continue to observe the position of the blue circle. S105, record the time when the blue circular random group rotates out of the screen.

10. The rotational speed measurement method as described in claim 9, characterized in that: The formula for calculating the rotational angular velocity of a hydro-generator unit is:

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