Hydraulic lock ingot control device for speed regulator servomotor of water-turbine generator set

Abstract

The utility model discloses a hydraulic lock spindle control device for a speed regulator servomotor of a water-turbine generator set, which comprises a lock spindle component and a hydraulic control component, and the hydraulic control component comprises an electromagnetic valve, a first oil supply pipeline, a second oil supply pipeline and a high-pressure needle valve. The two ends of the first oil supply pipeline are communicated with an internal oil way of the electromagnetic valve and an external speed regulator oil supply pipeline respectively, the two ends of the second oil supply pipeline are communicated with the internal oil way of the electromagnetic valve and an oil inlet of the piston cylinder body respectively, and the high-pressure needle valve is installed on the second oil supply pipeline. According to the hydraulic control device, the hydraulic control assembly is arranged and comprises the electromagnetic valve and the high-pressure needle valve, accurate control over an oil way of the servomotor locking device is achieved through the design, the oil way is effectively cut off when the servomotor locking piston cylinder body and the pipeline connecting piece have the oil leakage defect, and continuous, safe and stable operation of main equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of speed governor control of a water turbine generator set, in particular to a hydraulic lock spindle control device for a speed governor servomotor of a water turbine generator set. Background Art

[0002] At present, the turbine generator sets of large and medium-sized hydropower stations at home and abroad generally use speed governors to adjust the opening of the movable guide vanes of the turbines, thereby adjusting the flow through the turbine runner and adjusting the output of the generator sets. The turbine speed governor controls two sets of relays through the hydraulic control system to drive the control ring to move clockwise or counterclockwise, and the control ring drives the guide vanes to open or close, thereby achieving the effect of adjusting the opening of the movable guide vanes.

[0003] Since there is a certain amount of water leakage when the turbine guide vanes are fully closed, a water torque in the opening direction will be generated on the guide vanes, and the control circuit may also malfunction. In order to ensure the safety of equipment and personnel, after the unit is shut down and the guide vanes are fully closed, a relay hydraulic lock is generally used to prevent the relay from malfunctioning, so as to prevent the guide vanes from opening by mistake.

[0004] In the prior art, the control oil pipeline of the relay locking spindle device is generally not equipped with a device for cutting off the oil circuit. When the piston chamber and the pipeline connector of the relay locking spindle device leak oil, the oil circuit cannot be effectively cut off, and the oil pressure device needs to be drained and the pressure is relieved, which seriously affects the safe and stable operation of the unit. Utility Model Content

[0005] The utility model aims to provide a hydraulic lock spindle control device for a speed governor servomotor of a hydro-turbine generator set, so as to solve the problem mentioned in the background technology that the oil circuit cannot be effectively cut off when the piston chamber and the pipeline connector of the servomotor lock spindle device leak oil.

[0006] In order to solve the above technical problems, the utility model provides a hydraulic spindle locking control device of a speed governor relay of a hydro-turbine generator set, which includes a spindle locking assembly, the spindle locking assembly includes a piston cylinder, a piston, a piston rod and a spindle locking gate plate, and also includes a hydraulic control assembly, the hydraulic control assembly includes a solenoid valve, a first oil supply pipeline, a second oil supply pipeline and a high-pressure needle valve, the two ends of the first oil supply pipeline are respectively connected to the internal oil circuit of the solenoid valve and the external speed governor oil supply pipeline, the two ends of the second oil supply pipeline are respectively connected to the internal oil circuit of the solenoid valve and the oil inlet of the piston cylinder, and the high-pressure needle valve is installed on the second oil supply pipeline.

[0007] Furthermore, the piston cylinder body includes a piston cavity and a cavity cover, the piston cavity is cylindrical and hollow, a first oil supply channel is provided at the bottom of the piston cavity, the cavity cover is installed at the top of the piston cavity, and a second oil supply channel is provided inside the cavity, and the first oil supply channel and the second oil supply channel are respectively connected to the second oil supply pipeline.

[0008] Furthermore, the second oil supply pipeline includes a first connecting pipe and a second connecting pipe, the first connecting pipe connects the internal oil circuit of the solenoid valve and the first oil supply channel, the second connecting pipe connects the oil supply pipeline of the solenoid valve and the second oil supply channel, the number of the high-pressure needle valves is two, and the two high-pressure needle valves are respectively installed on the first connecting pipe and the second connecting pipe.

[0009] Furthermore, it also includes a signal feedback component, which includes a first signal feedback component, a second signal feedback component and a mechanical indicator. The first signal feedback component includes a support plate, and the upper and lower ends of the support plate are respectively equipped with a first travel switch and a second travel switch. The second signal feedback component includes a mounting plate, and the two ends of the mounting plate are respectively equipped with a first proximity switch and a second proximity switch. The mechanical indicator includes a pointer rod, which is used to feedback the position status of the locking spindle. The first end of the pointer rod is connected to the locking spindle gate plate, and the pointer rod moves between the first travel switch and the second travel switch and between the first proximity switch and the second proximity switch.

[0010] Furthermore, the mechanical indicator includes an indicator plate having a guide groove and installed on the outside of the first travel switch and the second travel switch, and travel marks are provided at both ends of the indicator plate. The second end of the pointer rod passes through the guide groove and is slidably connected to the inner wall of the guide groove.

[0011] Furthermore, the mechanical indicator comprises a pointer, and the pointer is fixedly connected to the second end of the pointer rod.

[0012] Furthermore, the lock spindle assembly also includes a support, which is a rectangular flat plate with a through hole at its center, the piston cylinder is installed above the support, the support is fixedly installed on the turbine governor relay body, and the through hole is adapted to the piston rod.

[0013] The beneficial effects of the utility model are as follows: the utility model sets a hydraulic control component, which includes a solenoid valve and a high-pressure needle valve. This design realizes precise control of the oil circuit of the relay locking device and effectively cuts off the oil circuit when oil leakage occurs in the relay locking piston cylinder and pipeline connectors, thereby ensuring the continuous safe and stable operation of the main equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0015] Figure 2 It is a schematic diagram of the local structure of an embodiment of the utility model.

[0016] Figure 3 It is a schematic diagram of the partial cross-sectional structure of an embodiment of the utility model.

[0017] Among them: 1. Locking spindle assembly; 2. Hydraulic control assembly; 3. Signal feedback assembly.

[0018] 11. Piston cylinder; 12. Piston; 13. Piston rod; 14. Locking gate; 15. Support; 21. Solenoid valve; 22. First oil supply pipeline; 23. Second oil supply pipeline; 24. High-pressure needle valve; 31. First signal feedback component; 32. Second signal feedback component; 33. Mechanical indicator.

[0019] 111, piston cavity; 112, cavity cover; 231, first connecting pipe; 232, second connecting pipe; 311, support plate; 312, first travel switch; 313, second travel switch; 321, mounting plate; 322, first proximity switch; 323, second proximity switch; 331, pointer rod; 332, indicator plate; 333, pointer.

[0020] 1111, first oil supply channel; 1112, first oil supply port; 1121, second oil supply channel; 1122, second oil supply port; 3321, guide groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiment is only one embodiment of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0022] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] In the following description, references to "one embodiment", "an embodiment", "an example", "an example", etc. indicate that the embodiment or example described in this way may include specific features, structures, characteristics, properties, elements or limitations, but not every embodiment or example necessarily includes the specific features, structures, characteristics, properties, elements or limitations. In addition, repeated use of the phrase "according to one embodiment of the present application" may refer to the same embodiment, but does not necessarily refer to the same embodiment.

[0024] like Figure 1-3 As shown, the utility model discloses a hydraulic lock spindle control device for a governor relay of a hydro-turbine generator set, which includes a lock spindle assembly 1, which includes a piston cylinder 11, a piston 12, a piston rod 13 and a lock spindle gate 14, that is, the piston 12 is installed inside the piston cylinder 11, the first end of the piston rod 13 is located inside the piston cylinder 11 and connected to the piston 12, and the second end of the piston rod 13 is located outside the piston cylinder 11 and connected to the lock spindle gate 14. It also includes a hydraulic control assembly 2, which includes a solenoid valve 21, a first oil supply pipeline 22, a second oil supply pipeline 23 and a high-pressure needle valve 24, the two ends of the first oil supply pipeline 22 are respectively connected to the internal oil circuit of the solenoid valve 21 and the external governor oil supply pipeline, the two ends of the second oil supply pipeline 23 are respectively connected to the internal oil circuit of the solenoid valve 21 and the oil inlet of the piston cylinder 11, and the high-pressure needle valve 24 is installed on the second oil supply pipeline 23.

[0025] The solenoid valve 21 controls the circulation of the operating oil. The first oil supply pipeline 22 provides a channel for the external speed regulator to supply oil to the solenoid valve 21. The second oil supply pipeline 23 guides the operating oil in the solenoid valve 21 to the oil inlet of the piston cylinder 11. The high-pressure needle valve 24 can further accurately control the flow and pressure of the operating oil entering the oil inlet of the piston cylinder 11. At the same time, the high-pressure needle valve 24 can also be used as a stop valve for the relay lock spindle control oil pipeline. When the relay lock spindle piston cylinder 11 and the pipeline connector have oil leakage defects, the oil circuit is effectively cut off to ensure the continuous safe and stable operation of the main equipment.

[0026] The utility model sets a hydraulic control component 2, which includes a solenoid valve 21 and a high-pressure needle valve 24. This design realizes precise control of the oil circuit of the servomotor locking device and effectively cuts off the oil circuit when oil leakage occurs in the servomotor locking piston cylinder 11 and the pipeline connector, thereby ensuring the continuous safe and stable operation of the main equipment.

[0027] In one embodiment, the piston cylinder 11 includes a piston cavity 111 and a cavity cover 112. The piston cavity 111 is cylindrical and hollow. A first oil supply passage 1111 is provided at the bottom of the piston cavity 111. The cavity cover 112 is mounted on the top of the piston cavity 111 and a second oil supply passage 1121 is provided inside the cavity. The first oil supply passage 1111 and the second oil supply passage 1121 are respectively connected to the second oil supply pipeline 23. In this embodiment, a first oil supply port 1112 connected to the first oil supply passage 1111 is provided at the bottom of the piston cavity 111, and a second oil supply port 1122 connected to the second oil supply passage 1121 is provided at the top of the cavity cover 112.

[0028] That is, the piston cavity 111 is cylindrical and hollow, ensuring that the piston 12 performs linear reciprocating motion therein, ensuring that the piston 12 can maintain a stable trajectory during movement, and the cavity cover 112 is installed on the top of the piston cavity 111 to seal and protect the piston cavity 111. A first oil supply channel 1111 is provided at the bottom of the piston cavity 111, and a second oil supply channel 1121 is provided inside the cavity cover 112 to further control the flow direction of the operating oil.

[0029] In one embodiment, the second oil supply pipeline 23 includes a first connecting pipe 231 and a second connecting pipe 232, wherein the first connecting pipe 231 is connected to the internal oil circuit of the solenoid valve 21 and the first oil supply channel 1111, and the second connecting pipe 232 is connected to the oil supply pipeline of the solenoid valve 21 and the second oil supply channel 1121. There are two high-pressure needle valves 24, which are respectively installed on the first connecting pipe 231 and the second connecting pipe 232. Two high-pressure needle valves 24 are installed, respectively located on the first connecting pipe 231 and the second connecting pipe 232. This design provides independent control of the two oil supply channels, so that the system can more flexibly adjust the flow rate and pressure of the operating oil. The opening size can be manually adjusted according to the actual situation to control the oil supply flow or cut off the oil circuit.

[0030] In the embodiment, the solenoid valve 21 has three control modes: first, remote automatic control mode of the computer monitoring system; second, local automatic / manual control mode of the speed governor control system; and third, pure manual control mode of the solenoid valve 21. At the same time, a switchable oil circuit is set inside the solenoid valve 21. Through the above three control modes, the internal oil circuit is switched by electrical signals to realize hydraulic control of the locking device.

[0031] In one embodiment, a signal feedback component 3 is also included, which includes a first signal feedback component 31, a second signal feedback component 32 and a mechanical indicator 33. The first signal feedback component 31 includes a support plate 311, and the upper and lower ends of the support plate 311 are respectively installed with a first travel switch 312 and a second travel switch 313. The second signal feedback component 32 includes a mounting plate 321, and the two ends of the mounting plate 321 are respectively installed with a first proximity switch 322 and a second proximity switch 323. The mechanical indicator 33 includes a pointer rod 331, which is used to feedback the position status of the locking spindle. The first end of the pointer rod 331 is connected to the locking spindle gate 14, and the pointer rod 331 moves between the first travel switch 312 and the second travel switch 313 and between the first proximity switch 322 and the second proximity switch 323.

[0032] In this embodiment, the first travel switch 312, the second travel switch 313, the first proximity switch 322 and the second proximity switch 323 are electrically connected to the speed regulator control system and the computer monitoring system respectively, and are prior art and will not be described in detail here.

[0033] In one embodiment, the mechanical indicator 33 includes an indicator plate 332, which is provided with a guide groove 3321 and is installed on the outside of the first travel switch 312 and the second travel switch 313. Both ends of the indicator plate 332 are provided with travel marks. The second end of the pointer rod 331 passes through the guide groove 3321 and is slidably connected to the inner wall of the guide groove 3321, so as to facilitate the feedback of the locking position signal. In the embodiment, the upper part of the indicator plate 332 is engraved with an exit mark corresponding to the horizontal position of the rotating arm of the first travel switch 312, and the lower part of the indicator plate 332 is engraved with an entry mark corresponding to the horizontal position of the rotating arm of the second travel switch 313. When the locking spindle is inserted and withdrawn, the locking spindle gate 14 drives the pointer rod 331 to move up and down, and the pointer rod 331 drives the pointer 333 to move up and down in the guide groove 3321 of the indicator plate 332.

[0034] In one embodiment, the mechanical indicator 33 includes a pointer 333, and the pointer 333 is fixedly connected to the second end of the pointer rod 331. In this embodiment, the pointer rod 331 is in a "7" shape, the lower end of the vertical part of the pointer rod 331 is connected to the upper end of the locking gate plate 14, and the end of the horizontal part of the pointer rod 331 passes through the guide groove 3321 on the indicator plate 332 and is connected to the pointer 333.

[0035] In one embodiment, the lock spindle assembly 1 also includes a support 15, which is a rectangular flat plate with a through hole at its center. A piston cylinder 11 is installed above the support 15. The support 15 is fixedly installed on the turbine governor relay body, and the through hole is adapted to the piston rod 13.

[0036] The design ideas of this embodiment are as follows:

[0037] The locking spindle assembly 1, the hydraulic control assembly 2 and the signal feedback assembly 3 are all arranged in the water wheel chamber of the turbine. The locking spindle assembly 1 includes a support 15 fixedly mounted on the turbine governor servomotor body, a cylindrical hollow piston cavity 111 fixed above the support 15, a cavity cover 112 mounted on the top of the piston cavity 111, a piston 12 mounted inside the piston cavity 111, a piston rod 13 passing through the through hole on the support 15, and the two ends of the piston rod 13 are respectively connected to the piston 12 and the locking spindle gate 14. A first oil supply channel 1111 is provided at the bottom of the piston cavity 111, a second oil supply channel 1121 is provided inside the cavity cover 112, and a first oil supply port 1112 communicating with the first oil supply channel 1111 is opened at the bottom of the piston cavity 111, and a second oil supply port 1122 communicating with the second oil supply channel 1121 is opened at the top of the cavity cover 112.

[0038] The hydraulic control component 2 includes a solenoid valve 21, a first oil supply pipeline 22, a second oil supply pipeline 23 and two high-pressure needle valves 24. The second oil supply pipeline 23 includes a first connecting pipe 231 and a second connecting pipe 232. The two ends of the first oil supply pipeline 22 are respectively connected to the internal oil circuit of the solenoid valve 21 and the external speed regulator oil supply pipeline. The two ends of the first connecting pipe 231 are respectively connected to the internal oil circuit of the solenoid valve 21 and the first oil supply port 1112 on the piston cavity 111. The second connecting pipe 232 is respectively connected to the oil supply pipeline of the solenoid valve 21 and the second oil supply port 1122 on the cavity cover 112. The two high-pressure needle valves 24 are respectively installed on the first connecting pipe 231 and the second connecting pipe 232.

[0039] The signal feedback component 3 includes a first signal feedback component 31, a second signal feedback component 32 and a mechanical indicator 33. The first signal feedback component 31 includes a support plate 311, and the first travel switch 312 and the second travel switch 313 are respectively installed at the upper and lower ends of the support plate 311. The second signal feedback component 32 includes a mounting plate 321, and the first proximity switch 322 and the second proximity switch 323 are respectively installed at both ends of the mounting plate 321. The mechanical indicator 33 includes a pointer rod 331, an indicator plate 332 and a pointer 333, which is used to feedback the position status of the locking spindle. The first end of the pointer rod 331 is connected to the locking spindle gate plate 14, and the pointer rod 331 moves between the first travel switch 312 and the second travel switch 313 and between the first proximity switch 322 and the second proximity switch 323. A guide groove 3321 is opened on the indicator plate 332, and the indicator plate 332 is installed on the outer side of the first travel switch 312 and the second travel switch 313. Both ends of the indicator plate 332 are provided with travel marks. The pointer rod 331 is in a "7" shape. The lower end of the vertical part of the pointer rod 331 is connected to the upper end of the locking gate plate 14, and the end of the horizontal part of the pointer rod 331 passes through the guide groove 3321 on the indicator plate 332 and is connected to the pointer 333.

[0040] That is, two sets of signal feedback components with different technical principles are provided as feedback elements of the lock state. The first signal feedback component 31 uses two contact mechanical travel switches to feedback the lock position state. When the lock is put in, the pointer rod 331 moves downward. After the lock is put in place, the pointer rod 331 contacts the second travel switch 313, and the contact of the second travel switch 313 is connected, sending a lock signal. When the lock is withdrawn, the pointer rod 331 moves upward. After the lock is withdrawn, the pointer rod 331 contacts the first travel switch 312, and the contact of the first travel switch 312 is connected, sending a lock signal. The second signal feedback component 32 uses two proximity switches to feedback the lock position state. When the lock is put in, the pointer rod 331 moves downward. After the lock is put in place, the second proximity switch 323 senses the pointer rod 331, and the second proximity switch 323 is actuated, sending a lock signal. When the lock is withdrawn, the pointer rod 331 moves upward. After the lock is withdrawn, the first proximity switch 322 senses the pointer rod 331, and the first proximity switch 322 is actuated, sending a lock signal. Through the mutual redundant configuration of the first signal feedback component 31 and the second signal feedback component 32, it can be ensured that the first signal feedback component 31 can still work normally when the second signal feedback component 32 cannot operate reliably due to interference from the ambient temperature, surrounding objects and similar switches, and it can also be ensured that when the first signal feedback component 31 causes incorrect signal feedback due to the strong impact of the pointer rod 331 with the travel switch, causing the travel switch contact to be damaged or the travel switch moving rod to be broken, the second signal feedback component 32 can still accurately feedback the lock spindle position signal. This effectively avoids failures such as unsuccessful unit startup caused by incorrect feedback of the lock spindle position signal, and improves the startup success rate of the hydro-turbine generator set and the safety and stability of equipment operation.

[0041] By setting the solenoid valve 21 and two high-pressure needle valves 24, it is not only possible to effectively adjust and control the flow of the operating oil, reduce the impact force between the pointer rod 331 and the travel switch, effectively avoid damage to the travel switch contacts or breakage of the travel switch arm, greatly increase the service life and working reliability of the first signal feedback member 31, and further improve the success rate of unit startup and the safety and stability of operation; at the same time, the two high-pressure needle valves 24 can also be used as stop valves for the relay lock spindle control oil pipeline, effectively cut off the oil circuit when the relay lock spindle piston cylinder 11 and the pipeline connector have oil leakage defects, and ensure the continuous safe and stable operation of the main equipment. A switchable oil circuit is set inside the solenoid valve 21, and the internal oil circuit is switched by electrical signals through the remote automatic control mode of the computer monitoring system or the local automatic / manual control mode of the speed governor control system or the pure manual control mode of the solenoid valve 21 body to realize the hydraulic control of the lock spindle device.

[0042] The upper part of the indicator plate 332 corresponds to the horizontal position of the arm of the first travel switch 312, and the lower part of the indicator plate 332 corresponds to the horizontal position of the arm of the second travel switch 313, and the locking plate gate 14 drives the pointer rod 331 to move up and down when the locking plate is inserted and withdrawn, and the pointer rod 331 drives the pointer 333 to move up and down in the guide groove 3321 of the indicator plate 332. When the locking plate is inserted into place, the pointer 333 accurately indicates the insertion mark, and when the locking plate is withdrawn into place, the pointer 333 accurately indicates the withdrawal mark. In other words, the signal feedback component 3 can intuitively and effectively indicate the actual position state of the locking plate, which is conducive to the operation and maintenance personnel to inspect the equipment and check the correctness of the electrical signal.

[0043] The utility model sets a hydraulic control component 2, which includes a solenoid valve 21 and a high-pressure needle valve 24. This design realizes precise control of the oil circuit of the servomotor locking device and effectively cuts off the oil circuit when oil leakage occurs in the servomotor locking piston cylinder 11 and the pipeline connector, thereby ensuring the continuous safe and stable operation of the main equipment.

[0044] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic spindle lock control device for a speed governor relay of a hydro-turbine generator set, comprising a spindle lock assembly, wherein the spindle lock assembly comprises a piston cylinder, a piston, a piston rod and a spindle lock gate, characterized in that: It also includes a hydraulic control component, which includes a solenoid valve, a first oil supply pipeline, a second oil supply pipeline and a high-pressure needle valve, the two ends of the first oil supply pipeline are respectively connected to the internal oil circuit of the solenoid valve and the external speed regulator oil supply pipeline, the two ends of the second oil supply pipeline are respectively connected to the internal oil circuit of the solenoid valve and the oil inlet of the piston cylinder body, and the high-pressure needle valve is installed on the second oil supply pipeline.

2. According to claim 1, a hydraulic lock spindle control device for a speed governor relay of a hydro-turbine generator set, characterized in that: The piston cylinder body includes a piston cavity and a cavity cover. The piston cavity is cylindrical and hollow. A first oil supply channel is provided at the bottom of the piston cavity. The cavity cover is installed at the top of the piston cavity and has a second oil supply channel inside. The first oil supply channel and the second oil supply channel are respectively connected to the second oil supply pipeline.

3. A hydraulic lock spindle control device for a speed governor servo of a hydro-turbine generator set according to claim 2, characterized in that: The second oil supply pipeline includes a first connecting pipe and a second connecting pipe, the first connecting pipe connects the internal oil circuit of the solenoid valve and the first oil supply channel, the second connecting pipe connects the oil supply pipeline of the solenoid valve and the second oil supply channel, the number of the high-pressure needle valves is two, and the two high-pressure needle valves are respectively installed on the first connecting pipe and the second connecting pipe.

4. According to claim 1, a hydraulic lock spindle control device for a speed governor servo of a hydro-generator set, characterized in that: It also includes a signal feedback component, which includes a first signal feedback component, a second signal feedback component and a mechanical indicator. The first signal feedback component includes a support plate, and the upper and lower ends of the support plate are respectively installed with a first travel switch and a second travel switch. The second signal feedback component includes a mounting plate, and the two ends of the mounting plate are respectively installed with a first proximity switch and a second proximity switch. The mechanical indicator includes a pointer rod, which is used to feedback the position status of the locking spindle. The first end of the pointer rod is connected to the locking spindle gate, and the pointer rod moves between the first travel switch and the second travel switch and between the first proximity switch and the second proximity switch.

5. A hydraulic lock spindle control device for a speed governor servo of a hydro-turbine generator set according to claim 4, characterized in that: The mechanical indicator includes an indicator plate, which has a guide groove and is installed on the outside of the first travel switch and the second travel switch. Both ends of the indicator plate are provided with travel marks. The second end of the pointer rod passes through the guide groove and is slidably connected to the inner wall of the guide groove.

6. A hydraulic lock spindle control device for a speed governor servo of a hydro-turbine generator set according to claim 5, characterized in that: The mechanical indicator comprises a pointer, and the pointer is fixedly connected to the second end of the pointer rod.

7. The hydraulic lock spindle control device for a speed governor servo of a hydro-turbine generator set according to claim 1, characterized in that: The locking spindle assembly also includes a support, which is a rectangular flat plate with a through hole at its center. The piston cylinder is installed above the support, and the support is fixedly installed on the turbine governor relay body. The through hole is adapted to the piston rod.

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