Shaft removing device of mixed-flow unit and using method of shaft removing device

Abstract

The invention provides a mixed-flow unit shaft disengaging device and a using method thereof.The mixed-flow unit shaft disengaging device comprises a generator shaft and a water turbine shaft, two supporting frames are arranged on the generator shaft, position adjusting devices are arranged at the two ends of each supporting frame, jacks are arranged between the position adjusting devices and the generator shaft, and clamping mechanisms are arranged at the bottoms of the jacks; the position adjusting device comprises a rotary supporting mechanism and a transverse adjusting mechanism, and a sleeving cylinder is arranged at the bottom of the transverse adjusting mechanism. In the shaft disengaging process, an operator does not need to wave a sledge hammer to hit, and the phenomenon that the operator is injured due to the fact that the sledge hammer hits the operator is avoided. In the shaft disengaging process, the weight of the rotating wheel is borne by the two bolts, and the phenomenon that the rotating wheel suddenly falls off and people below are seriously hurt due to improper operation when the bolts are hit is avoided. Meanwhile, the phenomena that time and labor are wasted in the continuous process of manually using a sledge hammer, operators are prone to fatigue, and the operators need to be replaced frequently are avoided.

Description

Technical Field

[0001] The invention relates to the field of maintenance of hydraulic generators, and in particular to a shaft-off device for a Francis type unit and a use method thereof. Background Art

[0002] In the maintenance of vertical turbine generators, the unit needs to be turned to check the verticality of the mirror plate sliding surface relative to the center line of the main shaft and the bending degree and direction of each section of the main shaft. The work of uncoupling and connecting the shaft will be carried out many times.

[0003] The prior art method of uncoupling the shaft is to leave two bolts symmetrically, first use a sledgehammer to loosen and remove the remaining bolts, and then divide into two groups of people to simultaneously use a sledgehammer to loosen the two symmetrically remaining bolts. During this process, the two bolts continue to bear the weight of the runner, and it is necessary for manpower to continuously hit them with a sledgehammer until the runner falls entirely onto the straight section of the tailwater pipe, and then the two bolts can be completely loosened and removed. The prior art method of coupling the shaft is: the coupling process is opposite to the uncoupling process, and it is necessary to use a method of slowly tightening two symmetrical bolts to lift the runner and combine it with the generator flange. During this process, the two bolts continue to bear the weight of the runner, and it is necessary for manpower to continuously hit them with a sledgehammer.

[0004] During the de-shafting work, in a narrow space, the operator's range of movement is limited when swinging the sledgehammer, and it is difficult to ensure a stable swinging trajectory. The sledgehammer is easily deviated from the target and injures the operator. Or during the de-shafting process, the weight of the runner is borne by two bolts. If the bolts are hit improperly, the runner may suddenly fall and cause serious harm to the personnel below. At the same time, the continuous process of using a sledgehammer manually is time-consuming and laborious, and the operator is easily fatigued, and personnel need to be replaced frequently, which reduces work efficiency. It is difficult to accurately control the strength and angle of manual strikes with a sledgehammer, resulting in uneven force on the bolts and an unstable fall of the runner. For this reason, we propose a de-shafting device for a mixed flow unit and a method of using it to solve the above problems. Summary of the invention

[0005] The present invention provides a mixed flow unit de-shafting device and a method for using the same, which solve the problems that during the de-shafting operation, a sledgehammer is used continuously by manpower to easily injure an operator, the bolts are subjected to uneven force, causing an unstable fall of the impeller, or improper operation when striking the bolts, causing the impeller to fall suddenly, thereby causing damage to equipment and personnel.

[0006] Another problem solved by the present invention is that the device can decouple turbine shafts with different turbine shaft diameters and different turbine shaft connecting hole positions, thereby avoiding the problem that a dedicated decoupling device cannot be used due to changes in the connecting hole positions of different turbine shafts.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a mixed flow unit de-shafting device and a method of using the same, including a generator shaft and a turbine shaft, two support frames are provided on the generator shaft, positioning devices are provided at both ends of the support frames, a jack is provided between the positioning device and the generator shaft, a clamping mechanism is provided at the bottom of the jack, the positioning device includes a slewing support mechanism and a horizontal adjustment mechanism, and a socket tube is provided at the bottom of the horizontal adjustment mechanism.

[0008] In the preferred solution, a flange is provided at one end of the generator shaft, and a plurality of connecting holes are provided on the flange. The generator shaft and the turbine shaft have the same structure, and two support frames are symmetrically installed relative to the generator shaft. Lifting bolts are provided on the support frames, and the lifting bolts pass through the connecting holes of the generator shaft and the turbine shaft, and the clamping mechanism is installed in the connecting holes.

[0009] In a preferred embodiment, the support frame includes a bracket, an arc-shaped plate is provided on the top of the bracket, circular connecting plates are provided at both ends of the arc-shaped plate, an arc-shaped groove is provided on the outer circle of the circular connecting plate, a through hole is provided on the bracket, a first rotating hole is provided on the circular connecting plate, and a bottom groove is provided at the bottom of the arc-shaped plate.

[0010] In a preferred solution, the slewing support mechanism includes a slewing support, the slewing support includes an outer ring and an inner ring gear, the outer ring and the inner ring gear are rotatably connected, a gear is provided inside the slewing support, and a rotating handle is provided on the gear.

[0011] In the preferred solution, the gear meshes with the inner ring gear, the inner ring gear is provided with a mounting hole, the handle rests on the first rotating hole, the outer ring rests on the bottom groove, and the outer ring is connected to the support frame.

[0012] In the preferred solution, the horizontal adjustment mechanism includes a disc with a rotating adjustment handle, a first bevel gear at one end of the adjustment handle, a second bevel gear at one side of the first bevel gear, a screw rod on the second bevel gear, and a U-shaped frame at the bottom of the disc.

[0013] In a preferred solution, a connecting column and an axial hole are provided on the disc, the connecting column is connected to the slewing support mechanism, the adjustment handle includes a rotating shaft, the rotating shaft abuts against the axial hole, and sliding grooves are provided at both ends of the U-shaped frame.

[0014] In the preferred embodiment, the sleeve includes a slide plate, the slide plate rests on the slide groove, a sleeve is provided at the bottom of the slide plate, one end of the jack rests on the sleeve, a threaded hole is provided on the slide plate, the threaded hole is connected to the screw rod, a bottom plate is provided at the bottom of the jack, and a clamping mechanism is provided at the bottom of the bottom plate.

[0015] In a preferred embodiment, the clamping mechanism includes a circular pillar and a plurality of sliding rods, a limiting column is provided on the sliding rod, a slave gear is provided at one end of the circular pillar, a plurality of second U-shaped frames are provided on the circular pillar, the sliding rod rests on the second U-shaped frame, an arc-shaped support plate is provided at one end of the sliding rod, a motor is provided on one of the second U-shaped frames, a main gear is provided at the output end of the motor, the main gear is meshed with the slave gear, a second arc-shaped groove is provided on the slave gear, and the limiting column rests on the second arc-shaped groove.

[0016] A method for using a shaft-off device for a mixed flow unit, characterized by: S1, preparation before shaft-off: manually remove three bolts symmetrically on one side in advance, place two jacks on the flange, install four clamping mechanisms in the connecting holes on both sides, and install two support frames against the flange; S2. Installing the clamping mechanism: driving the motor of the clamping mechanism to extend the sliding rod so that the plurality of arc-shaped support plates abut against the connecting holes of the generator shaft or the turbine shaft; S3, the lifting bolt passes through the through hole and is placed on the middle connecting hole, and a nut is set at the bottom of the lifting bolt; S4, adjusting the circumferential position of the sleeve tubes at both ends of the support frame: driving the rotary support mechanism of the position adjustment device to rotate the rotating handle to rotate the inner ring gear to adjust the circumferential position of the sleeve tube relative to the support frame; S5. Adjust the axial position of the sleeves at both ends: drive the adjustment handle of the horizontal adjustment mechanism to rotate the second bevel gear, so as to rotate the screw rod, so as to move the sleeve horizontally relative to the support frame, so as to adjust the axial position of the sleeve; S6. Lifting the support frame: driving multiple jacks so that one end of the jacks extends into the socket, and lifting the jacks in unison so that the nuts are against the turbine shaft; S7. Gradually remove the coupling bolts on the remaining generator shafts. The overall weight of the runner will be borne by four jacks. After the coupling bolts are removed, slowly lower the jacks to drop the turbine shaft steadily.

[0017] The beneficial effects of the present invention are as follows: when the shaft needs to be removed, two jacks are placed on the connecting holes, a clamping mechanism is provided at the bottom of the jack, and the clamping mechanism is driven to open the clamping mechanism so that the arc-shaped support plate abuts against the connecting hole, so that the jack is installed on the generator shaft, so that the jack can adapt to different generator shaft aperture sizes. The jack can be freely adjusted, and the jack can be installed as the position of the connecting hole changes, so that the overall structure can adapt to different position changes of the connecting hole.

[0018] Drive the rotating handle of the slewing support mechanism to rotate the inner ring gear relative to the outer ring, to rotate the horizontal adjustment mechanism relative to the support frame, and to rotate the sleeve relative to the center of the slewing support mechanism to adjust the circumferential position of the sleeve. Drive the adjusting handle of the horizontal adjustment mechanism to rotate the first bevel gear to rotate the screw to move the sleeve horizontally relative to the horizontal adjustment mechanism to adjust the horizontal position of the sleeve. One end of the jack extends into the sleeve, and the sleeve can adjust the position in the circumferential and horizontal directions. When the generator shaft model changes, the generator shaft diameter changes, or the number of connecting holes changes, resulting in a change in the position of the connecting holes, the positioning device can adapt to the position changes of the connecting holes of different generator shafts, so that the overall structure can be suitable for the decoupling treatment of generator shafts and turbine shafts of different models.

[0019] During the shaft uncoupling process, the three adjacent bolts supporting the generator shaft on both sides are removed, and the overall structure is installed on the generator shaft. During the entire process, the operator does not need to swing a sledgehammer to hit, thus avoiding the phenomenon of operators being injured by the sledgehammer. During the shaft uncoupling process, the weight of the runner is borne by two bolts, thus avoiding improper operation when hitting the bolts, causing the runner to suddenly fall and cause serious injuries to the personnel below. At the same time, it avoids the time-consuming and laborious process of using a sledgehammer continuously, which makes operators easily fatigued and requires frequent personnel replacement, thus reducing work efficiency, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments; Figure 1 It is an axonometric view of the overall structure of the present invention; Figure 2 It is a front view of the overall structure of the present invention; Figure 3 It is an axonometric view of a local structure of the present invention; Figure 4 is an axial side view of the support frame of the present invention; Figure 5 The present invention Figure 4 A magnified view of A; Figure 6 is an axonometric view of the positioning device of the present invention; Figure 7 is an exploded view of the slewing support mechanism of the present invention; Figure 8 It is an axial side view of the horizontal adjustment mechanism of the present invention; Fig. 9 It is a side view of the horizontal adjustment mechanism of the present invention; Fig.10 is an axial side view of the sleeve of the present invention; Fig.11 is a top view of the clamping mechanism of the present invention; In the figure: generator shaft 1; flange 101; connecting hole 102; turbine shaft 2; support frame 3; arc plate 301; bracket 302; through hole 303; circular connecting plate 304; first rotating hole 3041; arc groove 305; bottom groove 306; lifting bolt 4; jack 5; bottom plate 501; adjustment device 6; slewing support mechanism 7; outer ring 701; inner ring gear ring 702; mounting hole 7021; gear 703; rotating handle 704; horizontal adjustment mechanism 8; disk 801; shaft hole 8 011; connecting column 8012; adjusting handle 802; rotating shaft 8021; first bevel gear 803; second bevel gear 804; screw rod 805; U-shaped frame 806; sliding groove 807; nut 9; sleeve 10; slide plate 1001; sleeve 1002; threaded hole 1003; clamping mechanism 11; slave gear 1101; second U-shaped frame 1102; sliding rod 1103; arc support plate 1104; main gear 1105; second arc groove 1106; limiting column 1107. DETAILED DESCRIPTION

[0021] Embodiment 1: like Figure 1-11 In the invention, a shaft-off device for a mixed flow unit includes a generator shaft 1 and a turbine shaft 2. Two support frames 3 are provided on the generator shaft 1. Position adjustment devices 6 are provided at both ends of the support frames 3. A jack 5 is provided between the position adjustment device 6 and the generator shaft 1. A clamping mechanism 11 is provided at the bottom of the jack 5. The position adjustment device 6 includes a rotary support mechanism 7 and a horizontal adjustment mechanism 8. A sleeve 10 is provided at the bottom of the horizontal adjustment mechanism 8. With this structure, when the shaft needs to be off, the two jacks 5 are placed on the connecting hole 102. The clamping mechanism 11 is provided at the bottom of the jack 5. The clamping mechanism 11 is driven to open the clamping mechanism 11 so that the arc support plate 1104 abuts against the connecting hole 102, so that the jack 5 is installed on the generator shaft 1, so that the jack 5 can adapt to different aperture sizes of the generator shaft 1. The jack 5 can be adjusted freely, and the jack 5 can be installed as the position of the connecting hole 102 changes, so that the overall structure can adapt to different position changes of the connecting hole 102.

[0022] The rotating handle 704 of the slewing support mechanism 7 is driven to rotate the inner ring gear 702 relative to the outer ring 701, so that the horizontal adjustment mechanism 8 is rotated relative to the support frame 3, so that the sleeve 10 is rotated relative to the center of the slewing support mechanism 7 to adjust the circumferential position of the sleeve 10. The adjusting handle 802 of the horizontal adjustment mechanism 8 is driven to rotate the first bevel gear 803, so that the screw rod 805 is rotated, so that the sleeve 10 is horizontally moved relative to the horizontal adjustment mechanism 8 to adjust the horizontal position of the sleeve 10. One end of the jack 5 extends into the sleeve 10, and the sleeve 10 can adjust the position in the circumferential and horizontal directions. When the model of the generator shaft 1 changes, the diameter of the generator shaft 1 changes, or the number of the connecting holes 102 changes, resulting in a change in the position of the connecting holes 102, the positioning device 6 can adapt to the position change of the connecting holes 102 of different generator shafts 1, so that the overall structure can be suitable for the decoupling treatment of different models of generator shafts 1 and turbine shafts 2.

[0023] During the process of uncoiling, the three adjacent bolts supporting the generator shaft 1 on both sides are removed, and the overall structure is installed on the generator shaft 1. During the whole process, the operator does not need to swing a sledgehammer to hit, so as to avoid the phenomenon that the operator is injured by the sledgehammer during the process. During the process of uncoiling, the weight of the wheel is borne by two bolts, so as to avoid improper operation when hitting the bolts, causing the wheel to fall suddenly and causing serious injuries to the personnel below. At the same time, it avoids the phenomenon that the continuous process of manpower using a sledgehammer is time-consuming and laborious, the operator is easily fatigued, and the personnel need to be frequently replaced, which reduces the work efficiency.

[0024] During the shaft connection process, the device can still be used. The turbine shaft 2 is installed on the bottom bracket. After the lifting bolts 4 are installed, the nuts 9 are installed on the lifting bolts 4, and the jacks 5 are driven to make the turbine shaft 2 rest against the generator shaft 1. Then, other bolts are installed on the generator shaft 1 and the turbine shaft 2. The overall structure is quick and convenient, more efficient, and has low labor intensity, making it suitable for use.

[0025] In the preferred solution, a flange 101 is provided at one end of the generator shaft 1, and a plurality of connecting holes 102 are provided on the flange 101. The generator shaft 1 and the turbine shaft 2 have the same structure, and two support frames 3 are symmetrically installed relative to the generator shaft 1. Lifting bolts 4 are provided on the support frames 3, and the lifting bolts 4 pass through the connecting holes 102 of the generator shaft 1 and the turbine shaft 2, and the clamping mechanism 11 is installed in the connecting hole 102.

[0026] In the preferred solution, the support frame 3 includes a support frame 302, a curved plate 301 is provided on the top of the support frame 302, circular connecting plates 304 are provided at both ends of the curved plate 301, an arc groove 305 is provided on the outer ring of the circular connecting plate 304, a through hole 303 is provided on the support frame 302, a first rotating hole 3041 is provided on the circular connecting plate 304, and a bottom groove 306 is provided at the bottom of the curved plate 301. With this structure, the positioning device 6 is provided at both ends of the support frame 3. The curved structure of the curved plate 301 enables the support frame 3 to adapt to the generator shaft 1.

[0027] In a preferred solution, the slewing support mechanism 7 includes a slewing support, and the slewing support includes an outer ring 701 and an inner ring gear 702, the outer ring 701 and the inner ring gear 702 are rotatably connected, and a gear 703 is provided inside the slewing support, and a rotating handle 704 is provided on the gear 703. According to this structure, the rotating handle 704 of the slewing support mechanism 7 is driven to rotate the inner ring gear 702 relative to the outer ring 701, so that the horizontal adjustment mechanism 8 rotates relative to the support frame 3, so that the sleeve 10 rotates relative to the center of the slewing support mechanism 7, so as to adjust the circumferential position of the sleeve 10.

[0028] In the preferred solution, the gear 703 meshes with the inner ring gear 702, the inner ring gear 702 is provided with a mounting hole 7021, the handle 704 abuts against the first rotating hole 3041, the outer ring 701 abuts against the bottom groove 306, and the outer ring 701 is connected to the support frame 3. With this structure, the outer ring 701 is connected to the support frame 3, the disk 801 of the horizontal adjustment mechanism 8 is connected to the inner ring gear 702, and when the handle 704 is driven to rotate, the sleeve 10 is rotated relative to the center of the rotary support mechanism 7 to adjust the circumferential position of the sleeve 10.

[0029] In a preferred embodiment, the horizontal adjustment mechanism 8 includes a disk 801, a rotating adjustment handle 802 is provided on the disk 801, a first bevel gear 803 is provided at one end of the adjustment handle 802, a second bevel gear 804 is provided at one side of the first bevel gear 803, a screw rod 805 is provided on the second bevel gear 804, and a U-shaped frame 806 is provided at the bottom of the disk 801. According to this structure, the first bevel gear 803 is rotatably connected to the disk 801, a bracket block is provided at one side of the disk 801, the second bevel gear 804 is rotatably connected to the bracket block, the first bevel gear 803 is meshed with the second bevel gear 804, and the adjustment handle 802 is rotatably connected to the disk 801.

[0030] The adjusting handle 802 of the horizontal adjustment mechanism 8 is driven to rotate the first bevel gear 803, so that the screw rod 805 is rotated, so that the sleeve 10 moves horizontally relative to the horizontal adjustment mechanism 8, so as to adjust the horizontal position of the sleeve 10. One end of the jack 5 extends into the sleeve 10, and the sleeve 10 can adjust the position in the circumferential and horizontal directions. In the preferred solution, the disc 801 is provided with a connecting column 8012 and an axial hole 8011, the connecting column 8012 is connected to the slewing support mechanism 7, the adjusting handle 802 includes a rotating shaft 8021, the rotating shaft 8021 abuts on the axial hole 8011, and the two ends of the U-shaped frame 806 are provided with a slide groove 807. With this structure, the outer ring 701 abuts on the bottom groove 306, so that the outer ring 701 abuts on the support frame 3, and the connecting column 8012 abuts on the inner ring gear ring 702 of the slewing support mechanism 7. When the inner ring gear ring 702 rotates relative to the outer ring 701, the horizontal adjustment mechanism 8 rotates relative to the inner ring gear ring 702. With this structure, the center line of the slide groove 807 is parallel to the center line of the slewing support mechanism 7, so that the slide groove 807 is aligned with the center of the slewing support mechanism 7, and the adjusting handle 802 is driven to make the sleeve 10 move in a circular motion relative to the slewing support mechanism 7.

[0031] In a preferred embodiment, the sleeve 10 includes a slide plate 1001, the slide plate 1001 abuts against the slide groove 807, a sleeve 1002 is provided at the bottom of the slide plate 1001, one end of the jack 5 abuts against the sleeve 1002, a threaded hole 1003 is provided on the slide plate 1001, the threaded hole 1003 is connected to the screw rod 805, a bottom plate 501 is provided at the bottom of the jack 5, and a clamping mechanism 11 is provided at the bottom of the bottom plate 501. According to this structure, In a preferred solution, the clamping mechanism 11 includes a round pillar and a plurality of sliding rods 1103, a limiting column 1107 is provided on the sliding rod 1103, a slave gear 1101 is provided at one end of the round pillar, a plurality of second U-shaped frames 1102 are provided on the round pillar, the sliding rod 1103 abuts against the second U-shaped frame 1102, an arc support plate 1104 is provided at one end of the sliding rod 1103, a motor is provided on one of the second U-shaped frames 1102, a main gear 1105 is provided at the output end of the motor, the main gear 1105 is meshed with the slave gear 1101, a second arc groove 1106 is provided on the slave gear 1101, and the limiting column 1107 abuts against the second arc groove 1106. With this structure, the round pillar of the clamping mechanism 11 is connected to the bottom plate 501.

[0032] Embodiment 2: Further illustrate with reference to Example 1: A method for using a shaft-off device for a mixed flow unit, characterized by: S1, preparation before shaft-off: manually remove three bolts symmetrically on one side in advance, place two jacks 5 on a flange 101, install four clamping mechanisms 11 in connecting holes 102 on both sides, and install two support frames 3 against the flange 101; S2. Install the clamping mechanism 11: drive the motor of the clamping mechanism 11 to extend the sliding rod 1103 so that the plurality of arc-shaped support plates 1104 abut against the connecting holes of the generator shaft 1 or the turbine shaft 2; S3, the lifting bolt 4 passes through the through hole 303 and is placed on the middle connecting hole 102, and a nut 9 is set at the bottom of the lifting bolt 4; S4, adjusting the circumferential position of the sleeve tubes 10 at both ends of the support frame 3: driving the rotary support mechanism 7 of the position adjustment device 6 to rotate the rotating handle 704 to rotate the inner ring gear 702 so that the sleeve tube 10 is relative to the support frame 3 to adjust the circumferential position of the sleeve tube 10; S5. Adjust the axial position of the sleeve tubes 10 at both ends: drive the adjustment handle 802 of the horizontal adjustment mechanism 8 to rotate the second bevel gear 804, so as to rotate the screw rod 805, so as to move the sleeve tube 10 horizontally relative to the support frame 3, so as to adjust the axial position of the sleeve tube 10; S6, lifting the support frame 3: driving multiple jacks 5 so that one end of the jack 5 extends into the socket 10, and lifting the jacks 5 in unison so that the nut 9 abuts against the turbine shaft 2; S7. Gradually remove the coupling bolts on the remaining generator shafts 1. The overall weight of the runner will be borne by the four jacks 5. After the coupling bolts are removed, slowly lower the jacks 5 to drop the turbine shaft 2 steadily.

[0033] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A shaft-off device for a mixed flow unit, characterized in that: The invention comprises a generator shaft (1) and a turbine shaft (2), wherein two support frames (3) are provided on the generator shaft (1), and positioning devices (6) are provided at both ends of the support frames (3). A jack (5) is provided between the positioning device (6) and the generator shaft (1), and a clamping mechanism (11) is provided at the bottom of the jack (5). The positioning device (6) comprises a slewing support mechanism (7) and a horizontal adjustment mechanism (8), and a sleeve tube (10) is provided at the bottom of the horizontal adjustment mechanism (8).

2. According to claim 1, a shaft-off device for a mixed flow unit is characterized in that: A flange (101) is provided at one end of the generator shaft (1), and a plurality of connecting holes (102) are provided on the flange (101). The generator shaft (1) and the turbine shaft (2) have the same structure. Two support frames (3) are symmetrically installed relative to the generator shaft (1). The support frames (3) are provided with lifting bolts (4). The lifting bolts (4) penetrate the connecting holes (102) of the generator shaft (1) and the turbine shaft (2), and the clamping mechanism (11) is installed in the connecting hole (102).

3. According to claim 1, a shaft-off device for a mixed flow unit is characterized in that: The support frame (3) comprises a support (302), a curved plate (301) is provided on the top of the support (302), circular connecting plates (304) are provided at both ends of the curved plate (301), an outer ring of the circular connecting plate (304) is provided with a curved groove (305), a through hole (303) is provided on the support (302), a first rotating hole (3041) is provided on the circular connecting plate (304), and a bottom groove (306) is provided on the bottom of the curved plate (301).

4. The shaft-off device of a mixed flow unit according to claim 1, characterized in that: The slewing support mechanism (7) comprises a slewing support, the slewing support comprises an outer ring (701) and an inner ring gear (702), the outer ring (701) and the inner ring gear (702) are rotatably connected, a gear (703) is provided inside the slewing support, and a rotating handle (704) is provided on the gear (703).

5. The shaft-off device of a mixed flow unit according to claim 4, characterized in that: The gear (703) meshes with the inner ring gear (702), a mounting hole (7021) is provided on the inner ring gear (702), the handle (704) abuts against the first rotating hole (3041), the outer ring (701) abuts against the bottom groove (306), and the outer ring (701) is connected to the support frame (3).

6. The shaft-off device of a mixed flow unit according to claim 1, characterized in that: The horizontal adjustment mechanism (8) comprises a disc (801), a rotatable adjustment handle (802) is provided on the disc (801), a first bevel gear (803) is provided at one end of the adjustment handle (802), a second bevel gear (804) is provided at one side of the first bevel gear (803), a screw rod (805) is provided on the second bevel gear (804), and a U-shaped frame (806) is provided at the bottom of the disc (801).

7. The shaft-off device of a mixed flow unit according to claim 6, characterized in that: The disc (801) is provided with a connecting column (8012) and an axial hole (8011), the connecting column (8012) is connected to the slewing support mechanism (7), the adjusting handle (802) comprises a rotating shaft (8021), the rotating shaft (8021) abuts against the axial hole (8011), and sliding grooves (807) are provided at both ends of the U-shaped frame (806).

8. The shaft-off device of a mixed flow unit according to claim 1, characterized in that: The sleeve (10) comprises a slide plate (1001), the slide plate (1001) abuts against the slide groove (807), a sleeve (1002) is provided at the bottom of the slide plate (1001), one end of the jack (5) abuts against the sleeve (1002), a threaded hole (1003) is provided on the slide plate (1001), the threaded hole (1003) is connected to the screw rod (805), a bottom plate (501) is provided at the bottom of the jack (5), and a clamping mechanism (11) is provided at the bottom of the bottom plate (501).

9. The shaft-off device of a mixed flow unit according to claim 1, characterized in that: The clamping mechanism (11) comprises a round pillar and a plurality of sliding rods (1103), a limiting pillar (1107) being provided on the sliding rod (1103), a slave gear (1101) being provided at one end of the round pillar, a plurality of second U-shaped frames (1102) being provided on the round pillar, the sliding rod (1103) being abutted against the second U-shaped frames (1102), an arc-shaped support plate (1104) being provided at one end of the sliding rod (1103), a motor being provided on one of the second U-shaped frames (1102), a main gear (1105) being provided at the output end of the motor, the main gear (1105) being meshed with the slave gear (1101), a second arc-shaped groove (1106) being provided on the slave gear (1101), and the limiting pillar (1107) being abutted against the second arc-shaped groove (1106).

10. A method for using a shaft-decoupling device for a mixed flow unit according to any one of claims 1 to 9, characterized in that: S1. Preparation before shaft removal: three bolts are manually removed symmetrically on one side in advance, two jacks (5) are placed on the flange (101), four clamping mechanisms (11) are installed in the connecting holes (102) on both sides, and two support frames (3) are installed against the flange (101); S2, installing the clamping mechanism (11): driving the motor of the clamping mechanism (11) to extend the sliding rod (1103) so that the plurality of arc-shaped support plates (1104) abut against the connecting holes of the generator shaft (1) or the turbine shaft (2); S3, the lifting bolt (4) passes through the through hole (303) and is placed on the middle connecting hole (102), and a nut (9) is arranged at the bottom of the lifting bolt (4); S4, adjusting the circumferential position of the sleeve tube (10) at both ends of the support frame (3): driving the rotary support mechanism (7) of the position adjustment device (6) to rotate the rotating handle (704) to rotate the inner ring gear (702) to adjust the circumferential position of the sleeve tube (10) relative to the support frame (3); S5. Adjusting the axial position of the sleeve tubes (10) at both ends: driving the adjustment handle (802) of the horizontal adjustment mechanism (8) to rotate the second bevel gear (804), thereby rotating the screw rod (805), so that the sleeve tube (10) moves horizontally relative to the support frame (3), so as to adjust the axial position of the sleeve tube (10); S6. Lifting the support frame (3): driving a plurality of jacks (5) so that one end of the jacks (5) extends into the socket (10), and lifting the jacks (5) in unison so that the nuts (9) abut against the turbine shaft (2); S7. Gradually remove the coupling bolts on the remaining generator shafts (1). The overall weight of the runner will be borne by the four jacks (5). After the coupling bolts are removed, slowly lower the jacks (5) to steadily lower the turbine shaft (2).

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