Turning gear and method for steam turbine

Abstract

The invention discloses a steam turbine turning gear and method, and relates to the technical field of steam turbine auxiliary equipment. The steam turbine turning gear comprises a motor, a speed reducer, a ratchet wheel, a connecting piece, a pawl mechanism and a rotating body, the motor is in transmission connection with the ratchet wheel, and the speed reducer is arranged between the motor and the ratchet wheel; the rotating body is fixedly connected to the end of a steam turbine rotor, the pawl mechanism is arranged in the rotating body, and the rotating body and the ratchet wheel are arranged in a separable mode through the pawl mechanism. The pawl mechanism is separated from the ratchet wheel when the rotating speed of the turbine rotor is higher than that of the ratchet wheel; the ratchet wheel, the rotating body and the end of the steam turbine rotor are arranged in the bearing box, and the connecting piece is arranged on the speed reducer and fixedly connected with the bearing box. The problems of starting static torque and bending before starting of a steam turbine and bending of a steam turbine rotor after shutdown can be solved, and automatic disengaging and meshing can be achieved.

Description

Technical Field

[0001] A turbine turning gear device and method are disclosed, relating to the field of turbine auxiliary equipment technology. Background Technology

[0002] Steam turbines utilize the pressure and thermal energy of high-temperature, high-pressure steam to drive generators, pumps, fans, compressors, and other appliances through turbine expansion. They are widely used in power plants, steel mills, and petrochemical plants. The turning gear is a key auxiliary device for steam turbines. Its core function is to drive the hot rotor to maintain a stable low speed after the turbine stops, preventing thermal bending deformation due to excessive temperature differences. Simultaneously, before starting the turbine, the turning gear can rotate the rotor to overcome the starting static torque, ensuring a smooth start-up.

[0003] Existing turbine turning gears employ manual engagement and disengagement control, resulting in cumbersome operation procedures and difficulty in precisely controlling engagement timing, making them susceptible to human error that could affect the turning effect. Furthermore, some automatic turning gears have complex structural designs, containing numerous hydraulic and electrical control components, leading to high manufacturing costs, numerous potential failure points, and significant maintenance challenges.

[0004] It is evident that existing turning gear devices suffer from problems such as cumbersome manual operation of engagement and disengagement, susceptibility to human error affecting the turning effect, and complex structural design, high manufacturing cost, and difficult maintenance of automatic turning gear devices. Summary of the Invention

[0005] In view of this, the main objective of the present invention is to provide a turbine turning gear device and method, which can solve the problems of the existing turning gear device having a cumbersome operation process of manual engagement and disengagement control, which is easily affected by human operation errors, and the automatic turning gear device having a complex structural design, high manufacturing cost, and high maintenance difficulty.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] The turbine turning gear includes: a motor, a reducer, a ratchet, a connector, a pawl mechanism, and a rotating body. The motor and the ratchet are connected by a drive, and the reducer is arranged between the motor and the ratchet.

[0008] In a preferred embodiment, the rotating body is fixedly connected to the end of the steam turbine rotor, the pawl mechanism is disposed within the rotating body, and the rotating body can be detached from the ratchet wheel via the pawl mechanism.

[0009] In a preferred embodiment, when the turbine rotor speed is lower than the ratchet speed, the pawl mechanism engages with the ratchet teeth, and the ratchet drives the turbine rotor to rotate.

[0010] In a preferred embodiment, when the turbine rotor speed is higher than the ratchet speed, the pawl mechanism disengages from the ratchet.

[0011] In a preferred embodiment, the ratchet, the rotating body, and the turbine rotor end are disposed inside the bearing housing, the connecting member is disposed on the reducer, and the connecting member and the bearing housing are fixedly connected.

[0012] In a preferred embodiment, the rotating body has a rotating cavity, and the pawl mechanism, the ratchet, and the end of the turbine rotor are disposed in the rotating cavity;

[0013] In a preferred embodiment, the rotating cavity extends through both ends of the rotating body, and a limiting cavity is also formed within the rotating body. The limiting cavity is distributed circumferentially along the rotating cavity, and the limiting cavity and the rotating cavity are in communication.

[0014] In a preferred embodiment, the ratchet is disposed in the rotating cavity, the pawl mechanism is disposed in the limiting cavity, and the pawl mechanism and the ratchet are separable.

[0015] In a preferred embodiment, the pawl mechanism includes a spring-loaded member and a tongue, wherein the spring-loaded member and the tongue are respectively disposed within the limiting cavity;

[0016] In a preferred embodiment, the tongue includes a rotating part, a spring-loaded part, and a tightening part. The rotating part and the tightening part are integrally formed on both sides of the spring-loaded part. The rotating part is rotatably disposed in the limiting cavity. The spring-loaded part is disposed on the spring-loaded part. The tightening part engages with the ratchet.

[0017] In a preferred embodiment, the clamping part is disposed in the ratchet tooth groove, and the clamping part engages with the ratchet teeth.

[0018] In a preferred embodiment, when the turbine rotor speed is lower than the ratchet speed, the spring force of the spring-loaded component causes the clamping part to engage with the ratchet teeth;

[0019] In a preferred embodiment, when the turbine rotor speed is higher than the ratchet speed, the top tongue is compressed by centrifugal force, causing the top clamping part to disengage from the ratchet.

[0020] In a preferred embodiment, the speed reducer is a planetary speed reducer.

[0021] In a preferred embodiment, the spring is a torsion spring.

[0022] In a preferred embodiment, a handwheel is further provided on the electric motor, and the handwheel and the electric motor are detachably connected;

[0023] In a preferred embodiment, a fixed frame is provided on the bearing housing, and a limit switch is provided inside the fixed frame. When the handwheel is placed inside the fixed frame, the motor is powered on.

[0024] A method for turning gears of a steam turbine specifically includes the following steps:

[0025] S1. Fix the device in the bearing housing with the connector, fix the rotating body and the end of the turbine rotor, and adjust the ratchet and pawl mechanism to the meshing state;

[0026] S2. When the turbine is shut down, the turbine rotor speed is zero. The pawl mechanism and ratchet mesh, the motor is started, and the ratchet is driven to rotate. The pawl mechanism and ratchet mesh together to make the rotating body drive the end of the turbine rotor to rotate.

[0027] S3. Start the steam turbine to make the steam turbine rotor rotate. During the drive process, the speed of the steam turbine rotor is higher than the speed of the ratchet. The pawl mechanism disengages from the ratchet under the action of centrifugal force. At the same time, the system detects that the speed of the steam turbine rotor is higher than the speed of the ratchet and the motor stops.

[0028] S4. When the turbine needs to be shut down, shut down the turbine and start the motor. When the turbine rotor speed is less than the ratchet speed, the pawl mechanism and the ratchet engage. The pawl mechanism and the ratchet engage to make the rotating body drive the turbine rotor end to rotate.

[0029] S5. Turn off the motor, and the turbine rotor speed gradually drops to zero.

[0030] The turbine turning gear device and method of the present invention have the following beneficial effects:

[0031] The turbine turning gear includes: a motor, a reducer, a ratchet, a connector, a pawl mechanism, and a rotating body. The motor and the ratchet are connected by a drive, and the reducer is disposed between the motor and the ratchet. The rotating body is fixedly connected to the end of the turbine rotor. The pawl mechanism is disposed within the rotating body, and the rotating body is separable from the ratchet via the pawl mechanism. When the turbine rotor speed is lower than the ratchet speed, the pawl mechanism and the ratchet teeth engage, and the ratchet drives the turbine rotor to rotate. When the turbine rotor speed is higher than the ratchet speed, the pawl mechanism disengages from the ratchet. The ratchet, the rotating body, and the end of the turbine rotor are disposed within a bearing housing. The connector is disposed on the reducer and is fixedly connected to the bearing housing.

[0032] This turbine turning gear can solve the problems of starting static torque and bending before turbine startup and turbine rotor bending after shutdown. It can achieve automatic disengagement and automatic engagement transmission, and has a simple, safe and reliable structure. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a structural schematic diagram of a turbine turning gear according to the present disclosure;

[0035] Figure 2 This is a structural schematic diagram of the rotating body, pawl mechanism, and ratchet engagement state of a turbine turning gear according to the present disclosure;

[0036] Figure 3 This is a structural schematic diagram of the rotating body, pawl mechanism and ratchet of a turbine turning gear according to the present disclosure in a separated state;

[0037] Figure 4 This is a schematic diagram of a turbine turning gear handwheel mounted on a bearing housing, according to the present disclosure.

[0038] [Explanation of Key Component Symbols]

[0039] 1. Electric motor;

[0040] 2. Gear reducer;

[0041] 3. Ratchet;

[0042] 4. Connectors;

[0043] 5. Ratchet mechanism;

[0044] 51. Springback component;

[0045] 52. Tongue; 521. Rotating part; 522. Springback part; 523. Tightening part;

[0046] 6. Solids of revolution;

[0047] 61. Rotating cavity; 62. Limiting cavity;

[0048] 7. Handwheel; 71. Limit switch;

[0049] 01. Steam turbine rotor; 02. Bearing housing. Detailed Implementation

[0050] The turbine turning gear device and method of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] according to Figures 1-4 As shown, the turbine turning gear includes: an electric motor 1 connected to a power source to provide driving force to a reducer 2 and a ratchet 3; a reducer 2 that converts the speed and torque of the electric motor 1; a ratchet 3 that serves as a transmission mechanism; and a connecting piece 4 for fixing the turning gear within the turbine bearing housing 02. A pawl mechanism 5 and a rotating body 6 drive the turbine rotor 01 to rotate via the rotation of the ratchet 3. The electric motor 1 and the ratchet 3 are connected in a transmission connection to drive the ratchet 3 to rotate. To convert the high-speed, low-torque output of the electric motor 1 to the low-speed, high-torque output required by the turbine rotor 01 during startup, a reducer 2, which is a planetary reducer, is installed between the electric motor 1 and the ratchet 3. The ratchet 3 is mounted on the shaft end of the reducer 2 to ensure high requirements for transmission smoothness, accuracy, and rigidity, while reducing impact and vibration.

[0056] In order for the ratchet 3 to drive the turbine rotor 01 to rotate, the rotating body 6 is fixedly connected to the end of the turbine rotor 01, and the pawl mechanism 5 is set inside the rotating body 6. The rotating body 6 can be separated from the ratchet 3 through the pawl mechanism 5, so as to realize the automatic disengagement and automatic engagement transmission between the turning gear and the turbine rotor 01.

[0057] Specifically, before the turbine starts, it is in a shut-off state, and the turbine rotor 01 rotates at a speed lower than that of the ratchet 3. The pawl mechanism 5 and the ratchet 3 engage under the action of the spring force. Specifically, the spring force of the spring-loaded part 51 causes the clamping part 523 to engage with the ratchet teeth of the ratchet 3.

[0058] When the steam turbine starts up, high-temperature sealing steam flows through the front and rear shaft seals, at which time the turbine rotor 01 is stationary. To prevent the turbine rotor 01 from bending due to uneven heating, the turning gear motor 1 is started. The ratchet 3 drives the rotating body 6, which in turn drives the turbine rotor 01 to rotate, thereby eliminating the temperature difference between the upper and lower parts of the turbine rotor 01 and preventing it from bending due to uneven heating.

[0059] according to Figure 2 As shown, when the speed of the turbine rotor 01 is lower than that of the ratchet 3, the pawl mechanism 5 engages with the ratchet teeth of the ratchet 3 under the action of the rebound force. The ratchet teeth of the ratchet 3 drive the rotating body 6, and the rotating body 6 drives the turbine rotor 01 to rotate.

[0060] according to Figure 3 As shown, after the turbine starts, the turbine rotor 01 gradually increases in speed. When the turbine rotor 01 speed exceeds the ratchet 3 speed, the rotating body 6, fixedly connected to the turbine rotor 01, rotates along with the turbine rotor 01. The pawl mechanism 5 inside the rotating body 6 overcomes the rebound force and disengages from the ratchet teeth of the ratchet 3 under the influence of centrifugal force. Specifically, the top tongue 52 compresses the rebound member 51 under the influence of centrifugal force, causing the clamping part 523 to disengage from the ratchet 3. This avoids additional load on the turbine rotor 01. It should be noted that... Figure 2 and Figure 3 The ratchet 3 shown rotates clockwise with the rotating body 6. Naturally, from the same viewpoint, the turbine rotor 01, which is fixedly connected to the rotating body 6, also rotates clockwise. Furthermore, when the system detects that the turbine rotor 01's speed is higher than the ratchet 3's speed, the motor 1 automatically stops operating.

[0061] After the turbine is shut down, the turbine rotor 01 remains at a high temperature. To prevent the rotor from bending due to its static state under these conditions, the motor 1 needs to be turned on to reduce impact. The ratchet 3 starts to rotate, and when the turbine rotor 01 rotates at a speed lower than that of the ratchet 3, the pawl mechanism 5 inside the rotating body 6 engages with the ratchet 3 under the action of the rebound force. The ratchet teeth of the ratchet 3 drive the rotating body 6, which in turn drives the turbine rotor 01 to rotate, thus preventing thermal bending.

[0062] In this specific embodiment, when the turbine rotor 01 rotates at a speed lower than the ratchet 3, the pawl mechanism 5 engages with the ratchet teeth of the ratchet 3 under the action of the rebound force. The engagement process is divided into two cases. In the first case, when the turbine rotor 01 rotates at zero speed, the turbine rotor 01 and the ratchet 3 are engaged. Subsequently, the turbine is started until the turbine rotor 01 rotates at a speed higher than the ratchet 3, at which point the pawl mechanism 5 disengages from the ratchet 3. In the first case, during the disengagement process of the pawl mechanism 5, the tongue 52 continuously contacts the ratchet teeth and the ratchet groove of the ratchet 3 with its pressing part 523, and under the action of centrifugal force, the pressing part 523 presses against the back contour of the ratchet teeth of the ratchet 3 and disengages from the ratchet teeth. In the second case, when the turbine rotor 01 rotates at a speed higher than the ratchet 3, the turbine is shut down until the turbine rotor 01 rotates at a speed lower than the ratchet 3. It should be noted that in the second scenario described above, as the turbine rotor 01's speed decreases, the centrifugal force applied to the ratchet mechanism 5 within the rotating body 6 gradually decreases. Under the restoring force of the spring-loaded component 51, the top tongue 52 continuously contacts the ratchet teeth and grooves of the ratchet 3. Furthermore, due to its eccentric structure, the top tongue 52's rotating portion 522 continuously rotates, compressing the spring-loaded component 51. In this specific embodiment, the spring-loaded component 51 is a torsion spring. The pressing portion 523 of the top tongue 52 inevitably causes friction, and when the ratchet 3's speed exceeds that of the turbine rotor 01, the ratchet teeth of the ratchet 3 engage. Due to the irreversibility of the ratchet mechanism, the ratchet 3 drives the turbine rotor 01 to rotate. This turning gear device can solve the problems of static torque and bending before turbine startup, and the bending problem of the turbine rotor 01 after shutdown. It can achieve automatic disengagement and automatic engagement transmission, and its structure is simple, safe, and reliable.

[0063] To limit the axial movement of the pawl mechanism 5 and the ratchet 3, a connecting piece 4 is provided between the turbine bearing housing 02 and the turning gear. The ratchet 3, the rotating body 6, and the end of the turbine rotor 01 are located inside the bearing housing 02, and the connecting piece 4 is located on the reducer 2. The connecting piece 4 and the bearing housing 02 are fixedly connected by bolts.

[0064] Specifically, the rotating body 6 has a rotating cavity 61. The pawl mechanism 5, ratchet 3, and the end of the turbine rotor 01 are located within the rotating cavity 61. The rotating cavity 61 of the rotating body 6 and the turbine rotor 01 are interference-fitted. Furthermore, the rotating body 6 and the turbine rotor 01 are fixedly connected by a heat-fitting method with end face saddle pins. The positioning position of the saddle pins is based on... Figure 1As shown, the long side of the rotating body 6 contacts the turbine rotor 01. A rotating cavity 61 extends through both ends of the rotating body 6. A limiting cavity 62 is also formed within the rotating body 6, distributed circumferentially along the rotating cavity 61, and the limiting cavity 62 and the rotating cavity 61 are connected. In this specific embodiment, multiple limiting cavities 62 are provided, and correspondingly, multiple pawl mechanisms 5 are also provided. The number of pawl mechanisms 5 is the same as the number of limiting cavities 62 to improve transmission efficiency. A ratchet 3 is disposed within the rotating cavity 61, and the pawl mechanisms 5 are disposed within the limiting cavities 62. The pawl mechanisms 5 and the ratchet 3 can be separated.

[0065] To engage with the ratchet 3 teeth, the pawl mechanism 5 includes a spring-loaded element 51 providing a rebound force and a tongue 52 engaging with the ratchet 3 teeth. The spring-loaded element 51 and the tongue 52 are respectively disposed within the limiting cavity 62. To be separable from the ratchet 3, the tongue 52 includes a rotating portion 521 for rotation, a spring-loaded portion 522 in contact with the spring-loaded element 51, and a clamping portion 523 engaging with the ratchet teeth. To ensure structural strength, the rotating portion 521 and the clamping portion 523 are integrally formed on both sides of the spring-loaded portion 522. The rotating portion 521 is rotatably disposed within the limiting cavity 62. By rotating, the clamping portion 523 disengages from the ratchet 3 teeth. The spring-loaded element 51 is disposed on the spring-loaded portion 522, allowing the tongue 52 to compress the spring-loaded element 51 through the spring-loaded portion 522. Of course, the tightening part 523 is located in the tooth groove of the ratchet 3, and the tightening part 523 and the ratchet 3 are in a meshing state when there is no centrifugal force.

[0066] In this specific embodiment, the ratchet 3, as the drive end of the turntable, has a designed rotational speed of 10.5 rpm, and the mass of the tongue 52 is 0.16 kg. The installation load of the spring-loaded part 51 is 1.4 N. When the rotational speed reaches approximately 230 rpm or higher, the tongue 52 disengages from the ratchet 3 under the influence of centrifugal force. Due to the eccentric mass of the spring-loaded part 522 and the clamping part 523 of the tongue 52 relative to its own mounting shaft, i.e., the rotating part 521, when the centrifugal force is 23.4 N, the tongue 52 overcomes the spring force of the spring-loaded part 51, compresses the spring-loaded part 51, and causes the rotating part 521 to rotate around its own mounting shaft. The spring-loaded part 522 of the tongue 52 is tightly fitted with the inner wall of the limiting cavity 62 of the rotating body 6. At this time, the clamping part 523 of the tongue 52 is separated from the ratchet 3, and the working load of the torsion spring of the spring-loaded part 51 is 22 N.

[0067] In order to enable manual rotation, a handwheel 7 is also provided on the motor 1. Specifically, a shaft extends from the tail end of the motor 1, and the handwheel 7 is detachably connected to the shaft at the tail end of the motor 1. A fixing frame is provided on the bearing housing 02, and a limit switch 71 is provided inside the fixing frame. When the handwheel 7 is installed in the fixing frame, the limit switch 71 is turned on, and the motor 1 can be powered on. This prevents the motor from being accidentally turned on and causing personal injury when the operator is manually rotating the motor.

[0068] It should be noted that, in this specific embodiment, while meeting the speed requirements of the turbine rotor 01 and the ratchet 3 of the turning gear, different models of turning gears need to be designed according to the weight and moment of inertia of the turbine rotor 01. Furthermore, due to the different driving objects, the turning speed varies, ranging from 3 to 45 rpm.

[0069] A method for turning a steam turbine, specifically including the following steps:

[0070] S1. Fix the device in the bearing housing 02 through the connector 4, fix the ends of the rotating body 6 and the turbine rotor 01, and adjust the ratchet 3 and the pawl mechanism 5 to the meshing state.

[0071] S2. When the turbine is shut down, the turbine rotor 01 rotates at zero speed. The pawl mechanism 5 and the ratchet 3 are engaged. The motor 1 is started, which drives the ratchet 3 to rotate. Through the engagement of the pawl mechanism 5 and the ratchet 3, the rotating body 6 drives the end of the turbine rotor 01 to rotate.

[0072] S3. Start the steam turbine to make the steam turbine rotor 01 rotate. During the driving process, the speed of the steam turbine rotor 01 is higher than the speed of the ratchet 3. The pawl mechanism 5 disengages from the ratchet 3 under the action of centrifugal force. At the same time, the system detects that the speed of the steam turbine rotor 01 is higher than the speed of the ratchet 3, and the motor 1 stops.

[0073] S4. When the turbine needs to be shut down, shut down the turbine and start the motor 1. When the speed of the turbine rotor 01 is less than the speed of the ratchet 3, the pawl mechanism 5 and the ratchet 3 engage. Through the engagement of the pawl mechanism 5 and the ratchet 3, the rotating body 6 drives the end of the turbine rotor 01 to rotate.

[0074] S5. Turn off motor 1, and the speed of turbine rotor 01 gradually drops to zero.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A turbine turning gear device, characterized in that, include: The motor (1), reducer (2), ratchet (3), connector (4), pawl mechanism (5) and rotating body (6) are connected by transmission between the motor (1) and the ratchet (3), and the reducer (2) is provided between the motor (1) and the ratchet (3). The rotating body (6) is fixedly connected to the end of the turbine rotor (01), and the pawl mechanism (5) is disposed inside the rotating body (6). The rotating body (6) can be separated from the ratchet wheel (3) through the pawl mechanism (5). When the rotational speed of the turbine rotor (01) is lower than the rotational speed of the ratchet (3), the pawl mechanism (5) and the ratchet (3) mesh, and the ratchet (3) drives the turbine rotor (01) to rotate; When the rotational speed of the turbine rotor (01) is higher than the rotational speed of the ratchet (3), the pawl mechanism (5) and the ratchet (3) disengage; The ratchet (3), the rotating body (6) and the turbine rotor (01) are disposed in the bearing housing (02), the connecting piece (4) is disposed on the reducer (2), and the connecting piece (4) and the bearing housing (02) are fixedly connected.

2. The turbine turning gear device according to claim 1, characterized in that, The rotating body (6) has a rotating cavity (61), and the ends of the pawl mechanism (5), the ratchet (3) and the turbine rotor (01) are arranged in the rotating cavity (61); The rotating cavity (61) extends through both ends of the rotating body (6), and a limiting cavity (62) is also provided inside the rotating body (6). The limiting cavity (62) is distributed circumferentially along the rotating cavity (61), and the limiting cavity (62) and the rotating cavity (61) are connected. The ratchet (3) is disposed in the rotating cavity (61), and the pawl mechanism (5) is disposed in the limiting cavity (62). The pawl mechanism (5) and the ratchet (3) can be separated.

3. The turbine turning gear device according to claim 2, characterized in that, The pawl mechanism (5) includes: a spring-loaded component (51) and a tongue (52), wherein the spring-loaded component (51) and the tongue (52) are respectively disposed in the limiting cavity (62); The tongue (52) includes a rotating part (521), a spring-loaded part (522), and a tightening part (523). The rotating part (521) and the tightening part (523) are integrally formed on both sides of the spring-loaded part (522). The rotating part (521) is rotatably disposed in the limiting cavity (62). The spring-loaded part (51) is disposed on the spring-loaded part (522). The tightening part (523) engages with the ratchet (3).

4. The turbine turning gear device according to claim 3, characterized in that, The tightening part (523) is disposed in the tooth groove of the ratchet (3), and the tightening part (523) and the ratchet (3) mesh.

5. The turbine turning gear device according to claim 4, characterized in that, When the turbine rotor (01) rotates at a speed lower than the ratchet (3), the spring force of the spring-loaded part (51) causes the clamping part (523) and the ratchet (3) to mesh. When the turbine rotor (01) rotates at a speed higher than the ratchet (3), the top tongue (52) is affected by centrifugal force and compresses the spring piece (51), causing the top clamping part (523) to disengage from the ratchet (3).

6. The turbine turning gear device according to claim 5, characterized in that, The speed reducer (2) is a planetary speed reducer.

7. The turbine turning gear device according to claim 6, characterized in that, The spring-loaded component (51) is a torsion spring.

8. The turbine turning gear according to claim 7, characterized in that, A handwheel (7) is also provided on the electric motor (1), and the handwheel (7) and the electric motor (1) are detachably connected; A fixed frame is provided on the bearing housing (02), and a limit switch (71) is provided inside the fixed frame. When the handwheel (7) is placed inside the fixed frame, the motor (1) is powered on.

9. A turning gear method using a turbine turning gear according to any one of claims 1-8, characterized in that, Specifically, the steps include the following: S1. Fix the device in the bearing housing (02) through the connector (4), fix the ends of the rotating body (6) and the turbine rotor (01), and adjust the ratchet (3) and the pawl mechanism (5) to the meshing state. S2. When the turbine is shut down, the turbine rotor (01) rotates at zero speed. The pawl mechanism (5) and ratchet (3) mesh, start the motor (1), drive the ratchet (3) to rotate, and through the meshing of the pawl mechanism (5) and ratchet (3), the rotating body (6) drives the end of the turbine rotor (01) to rotate. S3. Start the steam turbine to make the steam turbine rotor (01) rotate. During the driving process, the speed of the steam turbine rotor (01) is higher than the speed of the ratchet (3). The pawl mechanism (5) disengages from the ratchet (3) under the action of centrifugal force. At the same time, the system detects that the speed of the steam turbine rotor (01) is higher than the speed of the ratchet (3) and the motor (1) stops. S4. When the turbine needs to be shut down, shut down the turbine and start the motor (1). When the speed of the turbine rotor (01) is less than the speed of the ratchet (3), the pawl mechanism (5) and the ratchet (3) mesh. Through the meshing of the pawl mechanism (5) and the ratchet (3), the rotating body (6) drives the end of the turbine rotor (01) to rotate. S5. Turn off the motor (1), and the turbine rotor (01) speed gradually drops to zero.

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