Rotating device for heating turbine impeller

Abstract

The invention belongs to the technical field of heat treatment equipment of steam turbines, and discloses a rotating device for heating an impeller of a steam turbine, which comprises a bearing table for bearing the impeller, the bearing table circumferentially rotates around the axis, and further comprises a support cylinder coaxially arranged with the bearing table, and the bearing table is rotatably arranged on the support cylinder. Wherein a through hole is formed in the center of the bearing table and the center of the supporting cylinder in a penetrating mode, the heating piece is arranged in the through hole, and the output end of the heating piece faces the impeller; the impeller rotates in the circumferential direction along with the bearing table and is evenly heated by a heating piece. Through the design that the impeller synchronously rotates along with the bearing table and the heating piece heats the impeller at the bearing center, the heating piece can evenly heat the rotating impeller in all directions, the problem of uneven heating caused by the fact that the impeller is static in a traditional heating mode is effectively solved, it is ensured that all parts of the impeller are consistent in mechanical performance, and the service life of the impeller is prolonged. The service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam turbine heat treatment equipment, and specifically relates to a rotating device for heating a steam turbine impeller. Background Art

[0002] In the field of steam turbine production, the impeller and the rotor main shaft usually adopt an interference fit. The inner hole of the impeller is smaller than the outer diameter of the rotor main shaft. This requires heating the impeller during assembly to promote the expansion of its inner hole so that it can be sleeved onto the rotor main shaft.

[0003] Currently, the impeller heating method mainly relies on manual operation. Multiple operators each hold a blowtorch to bake the impeller. This heating method has a long heating time and low efficiency. More importantly, it is very difficult to ensure the uniformity of heating when manually holding the blowtorch, resulting in uneven heating of the impeller. There may be phenomena of local overheating or overcooling, which will not only affect the uniformity of the inner hole expansion of the impeller, and then affect the assembly accuracy of the impeller and the rotor main shaft, thus affecting the mechanical properties of the impeller, but also may shorten its service life.

[0004] Therefore, a rotating device for heating a steam turbine impeller is proposed to solve the above problems. Summary of the Invention

[0005] To solve the problems raised in the above background art, the present invention provides a rotating device for heating a steam turbine impeller.

[0006] To achieve the above object, the present invention provides the following technical solution: A rotating device for heating a steam turbine impeller, including a bearing platform for carrying the impeller, the bearing platform rotates circumferentially around the axis, and further includes: A support cylinder, coaxially arranged with the bearing platform, and the bearing platform is rotatably arranged on the support cylinder.

[0007] Among them, a through hole is provided through the centers of the bearing platform and the support cylinder, A heating element, arranged in the through hole, and its output end faces the impeller; The impeller is uniformly heated by the heating element as it rotates circumferentially along with the bearing platform; A lifting platform, located radially outside the bearing platform, is used to lift / not lift the impeller vertically to a position higher than / not higher than the bearing platform.

[0008] In the above technical solution, preferably, the heating element includes: A flame spraying column, arranged in the through hole; A flame guiding passage, arranged in the flame spraying column; Flame spraying holes, vertically arranged in an array on the outside of the flame spraying column and communicating with the flame guiding passage.

[0009] In the above technical solution, preferably, it further includes: The moving frame slides radially along the flame jet column; The shielding plate and the limiting pulley are both connected to the moving frame; The reciprocating transmission member is arranged on the flame jet column and its output end is connected to the moving frame, and is used to drive the shielding plate and the limiting pulley on the moving frame to move radially; Moving along with the moving frame in the direction away from / towards the impeller, driving the limiting pulley away from / towards the surface of the impeller and the shielding plate to not shield / shield the flame jet holes. When the shielding plate shields the flame jet holes, the covered area of the flame ejected from the flame jet holes adapts to the axial length of the impeller.

[0010] In the above technical solution, preferably, the reciprocating transmission member includes: The upper electromagnetic suction plate is arranged on the flame jet column; The lower electromagnetic suction plate slides on the outside of the flame jet column and is fixedly connected to the moving frame; When the upper electromagnetic suction plate and the lower electromagnetic suction plate are in the state of being electrified and attracting / being powered off and releasing, it is used to drive the moving frame to move in the direction away from / towards the impeller.

[0011] In the above technical solution, preferably, the shielding plate and the flame jet holes are in the same vertical plane, and the limiting pulley and the shielding plate are arranged on adjacent planes on the moving frame and do not shield the flame jet holes during the movement.

[0012] In the above technical solution, preferably, it further includes: The fixing frame is connected to the moving frame, and the limiting pulley is rotatably arranged on the fixing frame; The rotary transmission member is arranged on the fixing frame and its output end is connected to the limiting pulley; Moving along with the moving frame to drive the limiting pulley to approach / away from the surface of the impeller, the rotary transmission member drives the limiting pulley to rotate away from / towards the flame jet column to be perpendicular / parallel to the flame jet column. Among them, when the limiting pulley is perpendicular to the flame jet column, the bottom surface of the limiting pulley and the bottom surface of the shielding plate are in the same plane.

[0013] In the above technical solution, preferably, the rotary transmission member includes: The rotating gear is connected to the shaft end of the limiting pulley; The function plate is arranged on the flame jet column; The toothed plate is arranged on the function plate; Moving along with the fixing frame to drive the limiting pulley to approach / away from the surface of the impeller, the rotating gear meshes with the toothed plate and rotates forward / backward to drive the limiting pulley to rotate to be perpendicular / parallel to the flame jet column.

[0014] In the above technical solution, preferably, the limiting pulley includes a shaft and a roller, the two ends of the shaft are respectively connected to the rotating gear and the roller, the fixing frame includes an L-shaped table, the rotating gear is arranged at the horizontal and vertical connection of the L-shaped table and can rotate around the position, a first magnetic block is arranged on the horizontal surface of the L-shaped table, and a second magnetic block is arranged on the side of the shaft away from the jet column; As the shaft rotates to be perpendicular to or parallel to the flame column, the first magnetic block and the second magnetic block are magnetically attracted or released.

[0015] In the above technical solution, preferably, it further includes a motor, the output end of the motor is provided with a transmission gear, the support platform is provided with a rotating gear, and the transmission gear is meshed with the rotating gear.

[0016] In the above technical solution, preferably, the lifting platform includes a push rod and a support plate, a lifting plate is rotatably provided on the support plate, and an output end of the push rod is connected to the lifting plate to drive the lifting plate to move back and forth vertically.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a design in which the impeller rotates synchronously with the carrier platform and the heating element heats the impeller at the carrier center, so that the heating element can uniformly heat the rotating impeller in all directions, effectively avoiding the problem of uneven heating caused by the stationary impeller in traditional heating methods, ensuring that the mechanical properties of various parts of the impeller are consistent, and extending its service life.

[0018] Furthermore, by setting a shielding plate, a limiting pulley, an upper electromagnetic suction plate and a lower electromagnetic suction plate, the movable frame slides radially on the flame column by energizing for mutual attraction and de-energizing for elimination of attraction, and then the shielding degree of the flame hole by the shielding plate is adjusted in coordination with the contact between the limiting pulley and the impeller surface, so that the coverage area of ​​the flame ejected from the flame hole can be flexibly changed to meet the heating requirements of impellers of different sizes, thereby improving the versatility of the device; Moreover, the limiting pulley can be rotated to two states, vertical or parallel to the flame column, under the action of the gear and the tooth plate. It can respectively realize the auxiliary baffle plate to change the flame hole area during the rotation of the impeller and avoid the placement and removal path of the impeller during the lifting process, ensuring that the impeller can be lifted smoothly, providing convenience for the preparation work before impeller heating and the subsequent processing after heating, and ensuring the continuity of the entire work process.

[0019] At the same time, when the shaft of the limiting pulley rotates to be perpendicular to the flame column, the first magnetic block and the second magnetic block are magnetically attracted to each other, which can effectively resist the force generated by the rotation of the impeller and prevent it from being transmitted to the fixed frame and the baffle plate, thereby ensuring that the entire heating device maintains stable operation during the impeller rotation heating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Three-dimensional structure diagram of the present invention; Figure 2 Three-dimensional structure diagram of the carrier table and support cylinder of the present invention; Figure 3 Three-dimensional structure diagram of the lifting table of the present invention; Figure 4 Three-dimensional structure diagram of the carrier table, motor, and transmission gear of the present invention; Figure 5 Three-dimensional structure diagram of the support cylinder of the present invention; Figure 6 Three-dimensional structure diagram of the heating element, shielding plate, and limit pulley of the present invention; Figure 7 Cross-sectional structure diagram of the present invention, flame spraying column, flame guiding passage, and flame spraying holes; Figure 8 Three-dimensional structure diagram of the L-shaped table, rotating gear, and function board of the present invention.

[0021] In the figure: 1. Carrier table; 2. Support cylinder; 3. Through hole; 4. Heating element; 41. Flame spraying column; 42. Flame guiding passage; 43. Flame spraying holes; 5. Lifting table; 51. Push rod; 52. Support plate; 53. Lifting plate; 6. Moving frame; 7. Shielding plate; 8. Limit pulley; 81. Shaft rod; 82. Roller; 9. Reciprocating transmission member; 91. Upper electromagnetic suction plate; 92. Lower electromagnetic suction plate; 10. Fixed frame; 101. L-shaped table; 11. Rotating transmission member; 111. Rotating gear; 112. Function board; 113. Toothed plate; 12. First magnetic block; 13. Second magnetic block; 14. Motor; 15. Transmission gear; 16. Rotating gear. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] As Figure 1 、 Figure 2 、 Figure 5 shown, the present invention provides a rotating device for heating a steam turbine impeller, including a carrier table 1 for carrying the impeller, and the carrier table 1 rotates circumferentially around the axis. The rotating device further includes: A support cylinder 2, coaxially arranged with the carrier table 1, and the carrier table 1 is rotatably arranged on the support cylinder 2.

[0024] Among them, a through hole 3 is provided through the centers of the carrier table 1 and the support cylinder 2. A heating element 4 is disposed in the through hole 3, with its output end facing the impeller; The impeller rotates along the circumferential direction with the carrier 1 and is evenly heated by the heating element 4; The lifting platform 5 is located radially outside the supporting platform 1 and is used to lift / not lift the impeller vertically to a position higher than / not higher than the supporting platform 1 .

[0025] The above design uniformly receives the heat radiation of the heating element 4 during the rotation of the impeller, ensures the uniformity of the heating of the impeller, avoids local overheating or overcooling, and improves the heating quality and efficiency of the impeller.

[0026] In combination with the design of the lifting platform 5, when the impeller needs to be placed, taken out or otherwise processed, the impeller can be lifted to a position higher than the supporting platform 1 by the lifting platform 5. For example, during the heating process, the impeller can be lowered to a position not higher than the supporting platform 1 so that it can rotate to receive heating from the heating element 4.

[0027] like Figure 6 , Figure 7 As shown, the heating element 4 comprises: The flame column 41 is arranged in the through hole 3; The flame guide passage 42 is provided in the flame column 41; The flame holes 43 are arranged in a vertical array outside the flame column 41 and are connected to the flame guide passage 42; The flame holes 43 can be designed to be at least two groups, which are symmetrically arranged on the outside of the flame column 41; The vertical array and symmetrically arranged distribution of the flame holes can ensure that when the impeller rotates circumferentially with the support platform 1, all parts from top to bottom can be evenly swept by the flame, thereby improving the uniformity of heating and facilitating the uniform heating of all parts of the impeller.

[0028] In the existing processing, due to the different axial lengths of impellers of different specifications and different heating requirements, the above heating method cannot accurately control the heating area for different impellers, which easily leads to the inability to guarantee the accuracy of the heating effect. Therefore, the following improvements are proposed: like Figure 6 As shown, it also includes: The movable frame 6 slides radially on the flame column 41; The shielding plate 7 and the limiting pulley 8 are both connected to the moving frame 6; A reciprocating transmission member 9 is provided on the flame column 41 and the output end of the reciprocating transmission member 9 is connected to the moving frame 6, and is used for driving the shielding plate 7 and the limiting pulley 8 on the moving frame 6 to move radially; As the moving frame 6 moves away from / closer to the impeller, it drives the limiting pulley 8 to move away from / closer to the impeller surface and the baffle 7 to unblock / block the flame ejection holes 43. When the baffle 7 blocks the flame ejection holes 43, the coverage area of the flame ejected from the flame ejection holes 43 adapts to the axial length of the impeller.

[0029] When the baffle 7 blocks the flame ejection holes 43, the flame coverage area can be accurately adapted to the axial length of the impeller. For impellers of different specifications, the number and distribution range of the actually participating flame ejection holes 43 can be flexibly adjusted, avoiding heating unnecessary parts of the impeller, ensuring the accuracy of the heating effect and preventing energy waste in areas that do not require heating.

[0030] Specifically, when adjusting the position of the baffle 7 to adapt to the axial length of the impeller, through the contact feedback between the limiting pulley 8 and the impeller surface, the moving distance of the moving frame 6 can be controlled to ensure that the baffle 7 blocks the flame ejection holes 43 in place.

[0031] The reciprocating transmission member 9 includes: The upper electromagnetic suction plate 91 is arranged on the flame ejection column 41; The lower electromagnetic suction plate 92 is slidably arranged outside the flame ejection column 41 and is fixedly connected to the moving frame 6; When the upper electromagnetic suction plate 91 and the lower electromagnetic suction plate 92 are in the state of being electrified and attracting / being powered off and releasing, it is used to drive the moving frame 6 to move away from / closer to the impeller.

[0032] During the feeding and discharging and rotation stages of the impeller, the electromagnetic suction plates are energized and powered off respectively. The response speed of the electromagnetic suction plates driving the moving frame 6 to move is fast, enabling the equipment to quickly switch between different heating tasks of the impeller and reducing the equipment adjustment time.

[0033] The baffle 7 and the flame ejection holes 43 are in the same vertical plane. The limiting pulley 8 and the baffle 7 are arranged on the moving frame 6 in adjacent planes and do not block the flame ejection holes 43 during the movement.

[0034] The position design of the baffle 7 and the flame ejection holes 43 and the limiting pulley 8 and the baffle 7 on the moving frame 6 ensures that the baffle 7 achieves the blocking effect on the flame ejection holes 43. At the same time, it also ensures that the limiting pulley 8 will not interfere with the flame ejection of the flame ejection holes while adapting to the impeller position and assisting the moving frame 6 in positioning, enabling the two to not interfere with each other, achieving effective blocking control of the flame ejection holes 43 and meeting the adaptation requirements for the impeller position.

[0035] Such as Figure 6 、 Figure 8 shown, it also includes: The fixing frame 10 is connected to the moving frame 6, and the limiting pulley 8 is rotatably arranged on the fixing frame 10; The rotary transmission member 11 is arranged on the fixing frame 10 and its output end is connected to the limiting pulley 8; As the movable frame 6 drives the limiting pulley 8 to approach / move away from the impeller surface, the rotating transmission member 11 drives the limiting pulley 8 to rotate away from / close to the jet flame column 41 to be perpendicular to / parallel to the jet flame column 41, wherein when the limiting pulley 8 is perpendicular to the jet flame column 41, the bottom surface of the limiting pulley 8 and the bottom surface of the baffle plate 7 are located in the same plane.

[0036] The limiting pulley 8 can be switched between the two states of being parallel and perpendicular to the jet flame column 41 by rotating the transmission member 11. When the limiting pulley 8 is parallel to the jet flame column 41, it is far away from the impeller surface, which is convenient for the equipment to carry out some preliminary preparations and later operations, such as placing and hoisting the impeller, without causing interference. During the heating process, the limiting pulley 8 is rotated to be perpendicular to the jet flame column 41 and close to the impeller surface, which can adapt to the impeller in real time. The whole process does not require an additional transmission source, and adaptive transformation of different working stages is achieved.

[0037] The rotating transmission member 11 comprises: The rotating gear 111 is connected to the shaft end of the limiting pulley 8; The functional plate 112 is arranged on the flame column 41; The tooth plate 113 is provided on the function plate 112; As the fixing frame 10 drives the limiting pulley 8 to approach / move away from the impeller surface, the rotating gear 111 meshes with the tooth plate 113 to rotate forwardly / reversely to drive the limiting pulley 8 to rotate to be perpendicular / parallel to the jet flame column 41 .

[0038] When the fixing frame 10 drives the limiting pulley 8 to approach or move away from the impeller surface, the meshing movement of the rotating gear 111 on the tooth plate 113 ensures that the limiting pulley 8 rotates according to the predetermined requirements, and realizes the automatic deployment and reset operation during the movement.

[0039] The limiting pulley 8 includes a shaft 81 and a roller 82, and the two ends of the shaft 81 are connected to the rotating gear 111 and the roller 82 respectively. The fixed frame 10 includes an L-shaped platform 101, and the rotating gear 111 is arranged at the horizontal and vertical connection position of the L-shaped platform 101 and can rotate around the position. A first magnetic block 12 is arranged on the horizontal surface of the L-shaped platform 101, and a second magnetic block 13 is arranged on the side of the shaft 81 away from the jet flame column 41; As the shaft 81 rotates to be perpendicular to or parallel to the flame column 41 , the first magnetic block 12 and the second magnetic block 13 are magnetically attracted or de-magnetized.

[0040] The first magnetic block 12 and the second magnetic block 13 are magnetically attracted or released. When the limiting pulley 8 contacts the impeller surface vertically with the flame column 41, the attracted state can stabilize the shaft 81, so that it always maintains a vertical posture under factors such as vibration caused by the rotation of the impeller, ensuring that the shielding plate 7 accurately covers the flame hole 43, and the shaft 81 is released from magnetic attraction under the rotation of the gear 111 in the non-heating state.

[0041] As shown Figure 4 in the figure, it further includes a motor 14. A rotating gear 15 is provided at the output end of the motor 14, and a rotating gear 16 is provided on the bearing table 1. The rotating gear 15 meshes with the rotating gear 16.

[0042] The above-mentioned gear transmission is a way to drive the rotation of the bearing table 1 in this application. In actual application scenarios, other transmission methods such as chain transmission (meshing of a chain and a sprocket) and worm and worm gear transmission can also be used to replace the mechanical energy, and can be replaced according to actual needs.

[0043] As shown Figure 3 in the figure, the lifting platform 5 includes a push rod 51 and a support plate 52. A lifting plate 53 is rotatably provided on the support plate 52. The output end of the push rod 51 is connected to the lifting plate 53 and is used to drive the lifting plate 53 to reciprocate vertically.

[0044] The transmission method of the push rod 51 can also be replaced with other linear transmission methods according to actual needs for use.

[0045] The working principle and usage process of the present invention: Start the lifting platform 5 to lower the lifting plate 53 to a suitable position, and place the impeller to be heated on the bearing table 1; At this time, the electromagnetic suction plate 91 and the lower electromagnetic suction plate 92 are de-energized and demagnetized. The moving frame 6 moves radially along the flame jet column 41 towards the impeller, and the shielding plate 7 moves accordingly to block the flame jet holes 43, adjusting the coverage area of the flame ejected from the flame jet holes 43. At the same time, the limit pulley 8 rotates to a state perpendicular to the flame jet column 41 under the action of the gear 111 and the toothed plate 113, and the first magnetic block 12 and the second magnetic block 13 are magnetically attracted. When the limit pulley 8 continues to move until it is disengaged from the surface of the impeller, the operation of controlling the coverage area of the flame ejected from the shielding plate 7 blocking the flame jet holes 43 is completed; Start the motor 14 to drive the rotating gear 16 to rotate through the rotating gear 15, thereby driving the bearing table 1 to rotate circumferentially around the axis, and the impeller also rotates synchronously. At the same time, the flame is ejected from the flame jet holes 43 to heat the impeller; After the heating is completed, the electromagnetic suction plate 91 and the lower electromagnetic suction plate 92 are energized and attracted, and the shielding plate 7 and the limit pulley 8 move up and reset. During this process, the limit pulley 8 rotates to a state parallel to the flame jet column 41 under the action of the gear 111 and the toothed plate 113, and the magnetic attraction between the first magnetic block 12 and the second magnetic block 13 is released, completing the storage operation of the limit pulley 8. The operator can then hoist the heated impeller.

[0046] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus.

[0047] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotating device for heating a steam turbine impeller, comprising a bearing table (1) for carrying the impeller, and the bearing table (1) rotates circumferentially around the axis line, characterized in that: It also includes: A support cylinder (2), coaxially arranged with the carrier table (1), and the carrier table (1) is rotatably arranged on the support cylinder (2); Wherein, through holes (3) are provided through the centers of the carrier table (1) and the support cylinder (2); A heating element (4), arranged in the through hole (3), and its output end faces the impeller; The impeller is uniformly heated by the heating element (4) as the carrier table (1) rotates circumferentially; A lifting table (5), located radially outside the carrier table (1), for lifting / non-lifting the impeller vertically to a position higher than / not higher than the carrier table (1).

2. The rotating device for heating a steam turbine impeller according to claim 1, characterized in that: The heating element (4) includes: A flame spraying column (41), arranged in the through hole (3); A flame guiding passage (42), arranged in the flame spraying column (41); Flame spraying holes (43), vertically arranged in an array on the outside of the flame spraying column (41) and communicating with the flame guiding passage (42).

3. The rotating device for heating a steam turbine impeller according to claim 2, characterized in that: It also includes: A moving frame (6), sliding radially on the flame spraying column (41); A shielding plate (7) and a limiting pulley (8), both connected to the moving frame (6); A reciprocating transmission member (9), arranged on the flame spraying column (41) and its output end connected to the moving frame (6), for driving the shielding plate (7) and the limiting pulley (8) on the moving frame (6) to move radially; As the moving frame (6) moves away from / towards the impeller, it drives the limiting pulley (8) to move away from / towards the impeller surface and the shielding plate (7) to not shield / shield the flame spraying holes (43). When the shielding plate (7) shields the flame spraying holes (43), the coverage area of the flame ejected from the flame spraying holes (43) matches the axial length of the impeller.

4. A rotating device for heating a steam turbine impeller according to claim 3, characterized in that: The reciprocating transmission member (9) includes: An upper electromagnetic suction plate (91), arranged on the flame spraying column (41); A lower electromagnetic suction plate (92), slidably arranged outside the flame spraying column (41) and fixedly connected to the moving frame (6); When the upper electromagnetic suction plate (91) and the lower electromagnetic suction plate (92) are in a state of being electrified and attracting / being powered off and releasing, they are used to drive the moving frame (6) to move away from / towards the impeller.

5. A rotating device for heating a steam turbine impeller according to claim 3, characterized in that: The shielding plate (7) is in the same vertical plane as the flame spraying holes (43), and the limiting pulley (8) and the shielding plate (7) are arranged in adjacent planes on the moving frame (6) and do not shield the flame spraying holes (43) during the movement.

6. The rotating device for heating a steam turbine impeller according to claim 5, characterized in that: It also includes: A fixing frame (10), connected to the moving frame (6), and the limiting pulley (8) is rotatably arranged on the fixing frame (10); A rotary transmission member (11), arranged on the fixing frame (10) and its output end connected to the limiting pulley (8); As the moving frame (6) drives the limiting pulley (8) to approach / away from the impeller surface, the rotary transmission member (11) drives the limiting pulley (8) to rotate away from / towards the flame spraying column (41) until it is perpendicular / parallel to the flame spraying column (41). Among them, when the limiting pulley (8) is perpendicular to the flame spraying column (41), the bottom surface of the limiting pulley (8) and the bottom surface of the shielding plate (7) are in the same plane.

7. The rotating device for heating a steam turbine impeller according to claim 6, characterized in that: The rotary transmission member (11) includes: A rotary gear (111), connected to the shaft end of the limiting pulley (8); A function plate (112), arranged on the flame spraying column (41); A toothed plate (113), arranged on the function plate (112); As the fixing frame (10) drives the limiting pulley (8) to approach / away from the impeller surface, the rotating gear (111) meshes with the toothed plate (113) and rotates forward / backward to drive the limiting pulley (8) to rotate to be perpendicular / parallel to the flame jet column (41).

8. A rotating device for heating a steam turbine impeller according to claim 7, characterized in that: The limiting pulley (8) includes a shaft rod (81) and a roller (82). Both ends of the shaft rod (81) are respectively connected to the rotating gear (111) and the roller (82). The fixing frame (10) includes an L-shaped platform (101). The rotating gear (111) is arranged at the connection of the horizontal and vertical sides of the L-shaped platform (101) and can rotate around this position. A first magnetic block (12) is arranged on the horizontal surface of the L-shaped platform (101), and a second magnetic block (13) is arranged on one side of the shaft rod (81) away from the flame jet column (41). As the shaft rod (81) rotates to be perpendicular / parallel to the flame jet column (41), the first magnetic block (12) and the second magnetic block (13) are magnetically attracted / demagnetized from each other.

9. A rotating device for heating a steam turbine impeller according to any one of claims 1-8, characterized in that: It further includes a motor (14). A transmission gear (15) is arranged at the output end of the motor (14). A rotating gear (16) is arranged on the bearing platform (1). The transmission gear (15) meshes with the rotating gear (16).

10. A rotating device for heating a steam turbine impeller according to claim 9, characterized in that: The lifting platform (5) includes a push rod (51) and a support plate (52). A lifting plate (53) is rotatably arranged on the support plate (52). The output end of the push rod (51) is connected to the lifting plate (53) and is used to drive the lifting plate (53) to reciprocate vertically.

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