Self-resetting locking device for hydraulic turbine servomotor

Abstract

The utility model discloses a water turbine servomotor self-resetting locking device which comprises a locking cylinder body, a cavity is formed in the middle of the locking cylinder body, an upper cylinder cover is arranged at the top of the locking cylinder body, a lower cylinder cover is arranged at the bottom of the locking cylinder body, and a piston is further arranged in the cavity in a sliding mode. The piston is connected with a piston rod, the piston rod penetrates through the lower cylinder cover, a locking block is arranged at the tail end of the piston rod, and the piston rod is further sleeved with a spring which is arranged between the lower cylinder cover and the bottom face of the piston. The upper cylinder cover is provided with an upper cylinder hydraulic hole communicated with the cavity, and the lower cylinder cover is provided with a lower cylinder hydraulic hole communicated with the cavity. According to the spring-assisted mechanical locking mechanism, the problem that a locking block of an existing locking device in a non-pressure state impacts a piston rod due to the fact that the locking block falls down due to dead weight is effectively solved, and potential equipment damage and potential safety hazards are prevented; the device can automatically adapt to pressure changes before and after pressure relief, and it is ensured that the locking block does not make misoperation; meanwhile, automatic resetting is achieved through the elastic force of the spring, and damage of the locking block to the piston rod in the non-pressure state is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to water conservancy power generation technical field, concretely relates to a water turbine servomotor self-resetting locking device. BACKGROUND

[0002] The servomotor of the hydroelectric generating set is an important component in the speed regulation system, which adjusts the guide vane opening to control the water flow when the generator is running, so as to realize the regulation of the unit speed and output power. In order to ensure that the guide vane will not be opened accidentally due to external factors or misoperation in the shutdown state, a locking device is usually configured to fix the guide vane position.

[0003] The existing locking device has some limitations. First of all, before the pressure relief of the speed regulation system, it must be ensured that the locking device has been correctly put into operation. Because in the no-pressure state, the locking block may fall due to gravity, in this case, if the locking block directly hits the piston rod of the servomotor, not only the equipment may be damaged, but also unpredictable safety hazards may be caused. Therefore, it is necessary to design a locking mechanism that can automatically adapt to pressure changes before and after the pressure relief of the speed regulation system, or to add a mechanical limiting structure to ensure that the locking block will not damage the piston rod due to gravity in any case. Therefore, it is necessary to improve the existing locking device to improve its safety in use. SUMMARY

[0004] In view of the deficiency that the existing locking device will damage the equipment and cause safety hazards when the locking block falls and hits the piston rod of the unit in the no-pressure state, the utility model provides a water turbine servomotor self-resetting locking device with self-resetting capability, which can automatically reset in the no-pressure state and avoid damage to the unit caused by the falling of the locking block.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A water turbine servomotor self-resetting locking device comprises a locking cylinder body, the middle of the locking cylinder body is a cavity, the top of the locking cylinder body is provided with an upper cylinder cover, the bottom of the locking cylinder body is provided with a lower cylinder cover, and a piston is further slidably arranged in the cavity; the bottom of the piston is fixedly connected with a piston rod, the piston rod extends outward through the lower cylinder cover, and a locking block is arranged at the end of the piston rod; a spring is further sleeved on the piston rod, and the spring is arranged between the lower cylinder cover and the bottom surface of the piston; the upper cylinder cover is provided with an upper cylinder hydraulic hole communicating with the cavity, and the lower cylinder cover is provided with a lower cylinder hydraulic hole communicating with the cavity.

[0007] Further, the top of the spring is fixedly connected with the bottom surface of the piston, and the bottom is fixedly connected with the top surface of the lower cylinder cover. By fixing the top of the spring with the bottom surface of the piston and the bottom with the top surface of the lower cylinder cover, the functionality and reliability of the self-resetting locking device of the water turbine servomotor are significantly improved, ensuring that the spring can stably provide a reset force and effectively prevent the locking block from freely falling due to gravity in any case, avoiding damage to the servomotor piston rod; at the same time, the fixed connection mode increases the structural stability of the entire system, reduces the risk of failure caused by loose or displaced parts, simplifies maintenance work, and improves the long-term operation reliability and safety of the equipment.

[0008] Further, the lower cylinder cover is provided with a through hole matching the piston rod, and a self-lubricating bushing matching the piston rod is embedded and installed at the top of the through hole. The self-lubricating bushing is made of copper-based self-lubricating bushing, which contains solid lubricant inside and gradually releases it during operation to form a persistent lubricating film, effectively reducing direct metal contact between the piston rod and the inner wall of the bushing and ensuring low friction coefficient even under long-term operation or harsh environment; the self-lubricating bushing allows the piston rod to move more smoothly when it contacts the lower cylinder body, reducing friction resistance and avoiding wear caused by insufficient or leakage of external lubricating oil, and the presence of the copper-based self-lubricating bushing provides more reliable mechanical support for the entire locking device, preventing failure caused by piston rod deviation or jamming and improving the safety and operation efficiency of the hydroelectric generating set.

[0009] Further, the bottom of the through hole is also provided with a circular ring-shaped gland, which is fixedly installed on the bottom surface of the lower cylinder cover by screws. The design of the gland not only effectively prevents the internal components such as the spring and piston rod from coming out of the through hole, ensuring the consistency and reliability of the locking block action, but also enhances the sealing effect of the entire device, preventing hydraulic oil leakage or external impurities from entering, improving the operation accuracy and long-term stability of the system; in addition, the detachable design of the gland fixed by screws makes it easy to install and remove, facilitating maintenance or replacement, simplifying the maintenance process and reducing maintenance costs.

[0010] Further, the bottom of the upper cylinder cover is designed as a boss matched with a cavity, and the top of the cylinder cover is detachably installed with a bolt, wherein a sealing ring is arranged at the position of the boss; the top of the lower cylinder cover is designed as a boss matched with a cavity, and the top of the cylinder cover is detachably installed with a bolt, wherein a sealing ring is arranged at the position of the boss. The upper cylinder cover and the lower cylinder cover are respectively clamped into the cavities through the sealing rings, and are fixedly connected with the locking cylinder through the bolts passing through the upper cylinder cover or the lower cylinder cover to complete the limiting operation, which is simple in structure and good in limiting effect. The detachable design facilitates the replacement or maintenance of the parts. The boss structure matched with the cavity is designed at the bottom of the upper cylinder cover and the top of the lower cylinder cover, and the sealing ring is installed at the position of the boss, so that the cylinder cover can be tightly clamped into the cavity of the locking cylinder, ensuring good sealing performance and preventing hydraulic oil leakage, and at the same time enhancing the stability of the overall structure. The upper cylinder cover and the lower cylinder cover are respectively fixedly connected with the locking cylinder through the bolts, realizing simple and effective limiting operation, ensuring that the piston will not deviate or vibrate during the working process, and improving the running accuracy and reliability of the system.

[0011] Further, the piston outer periphery is further provided with a guide belt and a combined sealing ring. The guide belt ensures the straightness and accuracy of the piston when moving up and down in the cylinder, reduces deviation and wear, and prolongs the service life of the piston and the cylinder. The combined sealing ring provides a multi-layer sealing effect, effectively preventing hydraulic oil leakage and preventing foreign matter from entering the cylinder interior, maintaining the cleanliness and efficient operation of the system.

[0012] Further, the upper cylinder hydraulic hole has two, and the outer side of the hole is respectively connected with an oil delivery pipe with a solenoid valve; the lower cylinder hydraulic hole has two, and the outer side of the hole is respectively connected with an oil delivery pipe with a solenoid valve. The oil delivery pipes on the upper cylinder hydraulic hole and the lower cylinder hydraulic hole are respectively connected with the oil inlet pipeline and the oil return pipeline of the oil supply equipment. When in use, by controlling the corresponding solenoid valve and the oil delivery equipment, the locking and unlocking operations of the locking device can be quickly completed without the need to replace the pipeline back and forth, which is convenient to control. For example, when the device needs to be locked, the solenoid valves on the oil delivery pipes connected with the upper cylinder hydraulic hole and the oil inlet pipeline and the oil delivery pipes connected with the lower cylinder hydraulic hole and the oil return pipeline are opened, and the oil enters the upper part of the cavity along the oil delivery pipe to push the piston down to realize locking, and vice versa.

[0013] Further, it further includes hydraulic oil tank, the top of hydraulic tank is equipped with oil inlet, and the side is further equipped with oil pump;The oil inlet pipe of the oil pump extends into the bottom, and the three-way joint is connected at the oil outlet. Two oil pipes connected with the upper cylinder hydraulic hole are connected with the oil inlet and the oil outlet of the oil tank respectively, two oil pipes connected with the lower cylinder hydraulic hole are connected with the oil inlet and the oil outlet of the oil tank respectively, when locking or unlocking, the electromagnetic valve on the oil pump and the corresponding oil pipe can be controlled to realize quick locking and unlocking;By accurately controlling the oil pump and the electromagnetic valve, it can ensure that the hydraulic oil flows along the predetermined path, so as to accurately complete the locking block input or exit action;In addition, the three-way joint connection mode simplifies the oil circuit system, reduces the number of pipelines and connection points, reduces the risk of leakage, and is convenient for maintenance and inspection.

[0014] Method for using:

[0015] When locking, the upper cylinder hydraulic hole is connected with the oil inlet pipeline of the factory, the lower cylinder hydraulic hole is connected with the oil return pipeline of the factory, and then the locking device is supplied with oil, at this time the hydraulic oil enters the cavity from the upper cylinder hydraulic hole, pushes the piston to move downward after filling the cavity, the piston moves to drive the piston rod and the locking block to move downward, the hydraulic oil in the cavity on one side of the piston rod is pushed out from the lower cylinder hydraulic hole, then the oil returns to the equipment of the factory through the oil return pipe, and the spring is compressed, so that the locking block is pushed into and clamped in the tumbler piston rod or control ring limiting hole, so as to fix the guide vane in the closed position, at this time, even if the oil pressure in the tumbler disappears, the guide vane will not be opened under the impact of water flow because the locking block has been firmly clamped in the tumbler piston rod or control ring; When unlocking, first confirm that the guide vane is indeed in the safe position and the hydraulic system is ready, connect the upper cylinder hydraulic hole with the oil return pipeline of the factory, connect the lower cylinder hydraulic hole with the oil inlet pipeline of the factory, and then supply oil to the locking device, at this time the hydraulic oil enters the cavity from the lower cylinder hydraulic hole, pushes the piston to move upward after filling the cavity, the piston moves to drive the piston rod and the locking block to move upward, and the spring is lifted by the elastic restoring force of itself, drives the locking block to leave the tumbler piston rod or control ring limiting hole, and the spring is reset.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] 1. The utility model discloses a spring auxiliary mechanical locking mechanism and hydraulic control system are combined, effectively solve the problem that the locking block of the existing locking device falls under the impact of the piston rod in the no pressure state, prevent potential equipment damage and security risks;The device can automatically adapt to pressure changes before and after the pressure relief of the speed regulation system, ensure that the locking block can keep stable state under any condition, and will not misoperate;At the same time, reliable locking and unlocking are realized by using hydraulic control, and the locking block is damaged to the piston rod in the no pressure state is avoided by using the spring elastic force automatic reset.

[0018] 2.The spring significantly improves the functionality and reliability of the water turbine servomotor self-resetting locking device, ensures that the spring can stably provide a reset force, effectively prevents the locking block from freely falling due to gravity in any case, and avoids damage to the servomotor piston rod;The self-lubricating bushing makes the relative movement of the piston rod and the lower cylinder body more smooth when they are in contact, reducing the friction resistance;The design of the gland not only effectively prevents the spring and the internal components such as the piston rod from falling out of the through hole, ensures the consistency and reliability of the locking block action, but also enhances the sealing effect of the entire device, prevents hydraulic oil leakage or external impurities from entering, and improves the system's running accuracy and long-term stability.

[0019] 3.The detachable design of the upper cylinder cover and the lower cylinder cover facilitates the replacement or maintenance of the components, and the connection through the sealing ring ensures good sealing to prevent hydraulic oil leakage, and the fixed connection of the locking cylinder body through the bolts realizes simple and effective limiting operation, ensuring that the piston does not deviate or vibrate during operation, improving the system's running accuracy and reliability;The guide belt on the outer periphery of the piston ensures the straightness and accuracy of the piston when moving up and down in the cylinder body, reducing deviation and wear, and prolonging the service life of the piston and the cylinder body.

[0020] 4.The oil delivery pipe on the upper cylinder hydraulic hole and the lower cylinder hydraulic hole is respectively connected to the oil inlet pipeline and the oil return pipeline of the oil supply equipment, and in use, by controlling the corresponding solenoid valve and the oil delivery equipment, the locking and unlocking operations of the locking device can be quickly completed without the need to replace the pipeline back and forth, facilitating operation;The setting of the hydraulic oil tank can realize quick locking and unlocking by controlling the oil pump and the solenoid valve on the corresponding oil delivery pipe when the device is locked or unlocked, which can ensure that the hydraulic oil flows along the predetermined path, thereby accurately completing the locking block input or exit action, and the operation is simple and safe and reliable to use.1. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic diagram of the locking cylinder body of the water turbine servomotor self-resetting locking device.

[0022] Figure 2 is Figure 1 the enlarged schematic view of A in figure

[0023] Figure 3 It is a structure schematic diagram of the hydraulic oil tank of the water turbine servomotor self-resetting locking device.

[0024] IDENTIFICATION OF DRAWINGS

[0025] Locking cylinder-1, cavity-11, lower cylinder cover-2, lower cylinder hydraulic hole-21, self-lubricating bushing-22, gland-23, screw-24, upper cylinder cover-3, upper cylinder hydraulic hole-31, piston-4, piston rod-41, guide belt-42, combined sealing ring-43, locking block-5, spring-6, bolt-71, sealing ring-72, oil delivery pipe-8, electromagnetic valve-81, hydraulic oil tank-9, oil inlet-91, oil pump-92. DETAILED DESCRIPTION

[0026] The utility model is further explained below in combination with the drawings.

[0027] Embodiment 1: a water turbine servomotor self-resetting locking device, including locking cylinder 1, the middle of locking cylinder 1 is cavity 11, is equipped with upper cylinder cover 3 on the top, is equipped with lower cylinder cover 2 on the bottom, still slidingly being equipped with piston 4 in cavity 11, the bottom of piston 4 is fixedly connected with piston rod 41, and piston rod 41 extends outward through lower cylinder cover 2, and locking block 5 is equipped at the end of piston rod 41, wherein spring 6 is further sleeved on piston rod 41, and spring 6 is arranged between lower cylinder cover 2 and the bottom surface of piston 4, upper cylinder cover 3 is equipped with upper cylinder hydraulic hole 31 that communicates cavity 11, and lower cylinder cover 2 is equipped with lower cylinder hydraulic hole 21 that communicates cavity 11.

[0028] When locking, upper cylinder hydraulic hole 31 is connected with the oil inlet pipeline of factory, lower cylinder hydraulic hole 21 is connected with the oil return pipeline of factory, then the locking device is supplied with oil, at this time, hydraulic oil enters cavity 11 from upper cylinder hydraulic hole 31, pushes piston 4 to move downwards after filling cavity 11, piston 4 moves and drives piston rod 41 and locking block 5 to move downwards, pushes the hydraulic oil in the cavity 11 on the side of piston rod 41 out from lower cylinder hydraulic, then the oil returns to the equipment of factory through the oil return pipe, and spring 6 is compressed, so that locking block 5 is pushed into and clamped in servomotor piston rod 41 or control ring limit hole, so as to fix the guide vane in the closed position, at this time, even if the oil pressure in the servomotor disappears, since locking block 5 has clamped servomotor piston rod 41 or control ring firmly, the guide vane will not be opened under the impact of water flow; when unlocking, first confirm that the guide vane is indeed in the safe position and the hydraulic system is ready, then upper cylinder hydraulic hole 31 is connected with the oil return pipeline of factory, lower cylinder hydraulic hole 21 is connected with the oil inlet pipeline of factory, then the locking device is supplied with oil, at this time, hydraulic oil enters cavity 11 from lower cylinder hydraulic hole 21, pushes piston 4 to move upwards after filling cavity 11, piston 4 moves and drives piston rod 41 and locking block 5 to move upwards, and spring 6 lifts piston 4 by virtue of the elastic restoring force of itself, drives locking block 5 to leave servomotor piston rod 41 or control ring limit hole, and the spring 6 resets after completing the unlocking process.

[0029] Example 2: The difference from Example 1 is that the top of the spring 6 is fixedly connected with the bottom surface of the piston 4, and the bottom is fixedly connected with the top surface of the lower cylinder cover 2. By fixing the top of the spring 6 with the bottom surface of the piston 4 and the bottom with the top surface of the lower cylinder cover 2, the functionality and reliability of the water turbine servomotor self-resetting locking device are significantly improved, ensuring that the spring 6 can stably provide a reset force and effectively prevent the locking block 5 from freely falling due to gravity in any case, avoiding damage to the servomotor piston rod 41; at the same time, the fixed connection mode increases the structural stability of the entire system, reduces the risk of failure caused by loose or displaced parts, simplifies maintenance, and improves the long-term operation reliability and safety of the equipment.

[0030] The bottom of the through hole is also provided with a circular ring-shaped gland 23, which is fixedly installed on the bottom surface of the lower cylinder cover 2 by screws 24. The design of the gland 23 not only effectively prevents the spring 6 and the piston rod 41 and other internal components from coming out of the through hole, ensuring the consistency and reliability of the locking block 5 action, but also enhances the sealing effect of the entire device, preventing hydraulic oil leakage or external impurities from entering, improving the operation accuracy and long-term stability of the system; in addition, the detachable design using screws 24 makes the gland 23 easy to install and remove, facilitating maintenance or replacement, simplifying the repair process and reducing maintenance costs.

[0031] Example 3: The difference from Example 2 is that the lower cylinder cover 2 is provided with a through hole matching the piston rod 41, and the top of the through hole is embedded with a self-lubricating bushing 22 matching the piston rod 41. The self-lubricating bushing 22 is made of copper-based self-lubricating bushing 22, which contains solid lubricant inside and gradually releases it during operation, forming a persistent lubricating film, effectively reducing the direct metal contact between the piston rod 41 and the inner wall of the bushing, ensuring low friction coefficient even in long-term operation or harsh environments; the self-lubricating bushing 22 makes the relative movement of the piston rod 41 and the lower cylinder body smoother, reducing friction resistance, while avoiding wear problems caused by insufficient or leakage of external lubricating oil, and the presence of the copper-based self-lubricating bushing 22 provides more reliable mechanical support for the entire locking device, preventing failures caused by piston rod 41 deviation or jamming, improving the safety and operation efficiency of the hydroelectric generating set.

[0032] The bottom of the upper cylinder cover 3 is designed as a boss matched with the cavity 11, and the top of the cylinder cover is detachably installed with a bolt 71, wherein the boss position is further provided with a sealing ring 72; the top of the lower cylinder cover 2 is designed as a boss matched with the cavity 11, and the top of the cylinder cover is detachably installed with a bolt 71, wherein the boss position is further provided with a sealing ring 72. The upper cylinder cover 3 and the lower cylinder cover 2 are respectively clamped into the cavity 11 through the sealing ring 72, and are fixedly connected with the locking cylinder body 1 through the bolt 71 passing through the upper cylinder cover 3 or the lower cylinder cover 2, to complete the limiting operation, which is simple in structure and good in limiting effect. The detachable design facilitates the replacement or maintenance of parts. The boss structure matched with the cavity 11 is designed at the bottom of the upper cylinder cover 3 and the top of the lower cylinder cover 2, and the sealing ring 72 is installed at the boss position, so that the cylinder cover can be tightly clamped into the cavity 11 of the locking cylinder body 1, ensuring good sealing performance and preventing hydraulic oil leakage, and at the same time enhancing the stability of the overall structure. The upper cylinder cover 3 and the lower cylinder cover 2 are respectively fixedly connected with the locking cylinder body 1 through the bolt 71, to realize simple and effective limiting operation, ensure that the piston 4 does not deviate or vibrate during operation, and improve the operation accuracy and reliability of the system.

[0033] The piston 4 is further provided with a guide belt 42 and a combined sealing ring 43. The guide belt 42 ensures the straightness and accuracy of the piston 4 when moving up and down in the cylinder body, reduces deviation and wear, and prolongs the service life of the piston 4 and the cylinder body. The combined sealing ring 43 provides multi-layer sealing effect, effectively prevents hydraulic oil leakage, and at the same time prevents foreign matter from entering the inside of the cylinder body, maintaining the cleanliness and efficient operation of the system.

[0034] In example 4, the upper cylinder hydraulic hole 31 has two, and the outer side of the hole is respectively connected with the oil conveying pipe 8 with electromagnetic valve 81; the lower cylinder hydraulic hole 21 has two, and the outer side of the hole is respectively connected with the oil conveying pipe 8 with electromagnetic valve 81. The oil conveying pipe 8 on the upper cylinder hydraulic hole 31 and the lower cylinder hydraulic hole 21 is respectively connected with the oil inlet pipeline and the oil return pipeline of the oil supply equipment. In use, by controlling the corresponding electromagnetic valve 81 and the oil conveying equipment, the locking and unlocking operation of the locking device can be quickly completed without changing the pipeline back and forth, which is convenient to control. For example, when the device needs to be locked, the electromagnetic valve 81 on the oil conveying pipe 8 connected with the upper cylinder hydraulic hole 31 and the oil inlet pipeline and the electromagnetic valve 81 on the oil conveying pipe 8 connected with the lower cylinder hydraulic hole 21 and the oil return pipeline are opened, and the oil enters the upper part of the cavity 11 along the oil conveying pipe 8, pushing the piston 4 down to achieve locking, and vice versa.

[0035] Further comprising hydraulic oil tank 9, the top of the hydraulic tank is provided with oil inlet 91, and the side is further provided with oil pump 92; the oil inlet pipe of the oil pump 92 extends into the bottom, and the oil outlet is connected with a three-way pipe.Two of the three-way pipes are connected with the oil inlet 91 and the oil outlet of the oil tank respectively, and the other two are connected with the oil inlet 91 and the oil outlet of the oil tank respectively, when locking or unlocking is needed, the oil pump 92 and the electromagnetic valve 81 on the corresponding oil pipe 8 can be controlled to realize quick unlocking and locking; by accurately controlling the oil pump 92 and the electromagnetic valve 81, the hydraulic oil can flow along the predetermined path, so that the locking block 5 can be accurately put into or withdrawn; in addition, the three-way pipe connection mode simplifies the oil circuit system, reduces the number of pipes and connection points, reduces the risk of leakage, and is convenient for maintenance and inspection.

[0036] In the specification of the utility model, a large number of specific details are explained. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0037] Finally, it should be noted that: the above embodiments are only used to illustrate the technical scheme of the utility model, but not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the utility model, and they should be covered in the scope of the claims and the specification of the utility model.

Claims

1. A hydro-turbine servomotor self-resetting locking device, characterized by: The application relates to a locking cylinder, which comprises a locking cylinder body (1) with a cavity (11) in the middle, an upper cylinder cover (3) at the top and a lower cylinder cover (2) at the bottom, and a piston (4) slidingly arranged in the cavity (11); the bottom of the piston (4) is fixedly connected with a piston rod (41), the piston rod (41) extends outwards through the lower cylinder cover (2), a locking block (5) is arranged at the end of the piston rod (41), a spring (6) is further arranged on the piston rod (41) and located between the lower cylinder cover (2) and the bottom surface of the piston (4); the upper cylinder cover (3) is provided with upper cylinder hydraulic holes (31) communicating with the cavity (11), and the lower cylinder cover (2) is provided with lower cylinder hydraulic holes (21) communicating with the cavity (11).

2. A hydraulic turbine servomotor self-resetting locking device as defined in claim 1, characterized in that: The top of the spring (6) is fixedly connected with the bottom surface of the piston (4), and the bottom is fixedly connected with the top surface of the lower cylinder cover (2).

3. A hydraulic turbine servomotor self-resetting locking device as defined in claim 1, wherein: A through hole for matching the piston rod (41) is arranged in the middle of the lower cylinder cover (2), and a self-lubricating bushing (22) for matching the piston rod (41) is embeddedly arranged at the top of the through hole.

4. A hydraulic turbine servomotor self-resetting locking device as defined in claim 3 wherein: A circular annular gland (23) is further arranged at the bottom of the through hole, and the gland (23) is fixedly arranged on the bottom surface of the lower cylinder cover (2) through screws (24).

5. A hydraulic turbine servomotor self-resetting locking device according to any one of claims 1 to 4, characterized in that: The bottom of the upper cylinder cover (3) is designed as a boss matched with the cavity (11), a bolt (71) is detachably arranged on the top of the cylinder cover, and a sealing ring (72) is further arranged at the boss position; the top of the lower cylinder cover (2) is designed as a boss matched with the cavity (11), a bolt (71) is detachably arranged on the top of the cylinder cover, and a sealing ring (72) is further arranged at the boss position.

6. A hydraulic turbine servomotor self-resetting locking device as defined in claim 5 wherein: A guide belt (42) and a combined sealing ring (43) are further arranged on the outer periphery of the piston (4).

7. A hydraulic turbine servomotor self-resetting locking device as defined in claim 1 wherein: The upper cylinder hydraulic holes (31) are two, and the outer sides of the holes are respectively connected with oil conveying pipes (8) provided with electromagnetic valves (81); the lower cylinder hydraulic holes (21) are two, and the outer sides of the holes are respectively connected with oil conveying pipes (8) provided with electromagnetic valves (81).

8. A hydraulic turbine servomotor self-resetting locking device as defined in claim 7 wherein: The application further comprises a hydraulic oil tank (9), the top of the hydraulic tank is provided with an oil inlet (91), and the side is further provided with an oil pump (92); the oil inlet pipe of the oil pump (92) extends into the bottom, and a three-way pipe is connected at the oil outlet.

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