An intelligent lifting system and method for overhauling a runner of an axial-flow generator set

Abstract

The application discloses an intelligent lifting system and method for overhauling a runner of an axial flow generator set, which comprises a lifting device installed on a ring-shaped base, and the ring-shaped base is installed on a transition base; the lifting device comprises a lifting base, a motor, a speed reducer and a winding drum, which are installed on the lifting base; the output shaft of the motor is connected with the output shaft of the speed reducer through a connecting device; the output shaft of the speed reducer is connected with one end of the winding drum; the bottom of the lifting base is provided with a weighing device; the other end of the input shaft of the speed reducer is provided with a limiting device; and the other end of the winding drum is provided with an encoder. The weighing device can detect the tension of the steel wire rope in real time, and the safety of the steel wire rope and the system structure is ensured; the encoder can detect the rotating speed of the winding drum in real time, the speed is uniform when multiple lifting systems operate simultaneously, the stable lifting of the trestle platform is ensured, and the limiting device is arranged to prevent the steel wire rope from falling after the motor stops working. The application has the characteristics of convenient installation, high safety and good stability.

Description

Technical Field

[0001] This invention relates to the field of axial-flow generator set maintenance technology, and in particular to an intelligent lifting system and method for an axial-flow generator set runner maintenance frame. Background Technology

[0002] The erection of a maintenance scaffold for a power plant's runner is a key controlled operation. The process involves first placing various metal aggregates, up to 4 meters long, through a narrow conical inlet gate into the tailrace pipe. After assembling an 11-meter diameter circular platform at the bottom of the tailrace pipe, two cranes lift it from the tailrace pipe to the 30-meter conical inlet gate. During this lifting, the four hooks of the two cranes must be connected by wire ropes threaded through pulley systems and lifted synchronously. This operation is highly susceptible to serious safety accidents such as scraping against the runner's inner wall, platform deformation, hitting the spillway cone, and platform collapse. Furthermore, the installation and removal of the runner suspension fixtures are constrained by the power plant's hydraulic structure, leading to problems such as skewed lifting, unclear command signals, and potential production safety accidents. Therefore, an intelligent lifting system for an axial-flow generator runner maintenance scaffold was designed to address these issues. Summary of the Invention

[0003] The technical problem to be solved by this invention is to address the problems existing in the background technology mentioned above, and to provide an intelligent lifting system for the maintenance frame of an axial-flow generator set. The system is positioned and installed on the support arm of the generator set's upper frame via a transition base. The lifting base is limited by a ring base, making installation simple and convenient. A weighing device is installed on the underside of the lifting base to monitor the tension of the wire rope in real time, ensuring the safety of the wire rope and the structure. An encoder monitors the rotational speed of the drum in real time, ensuring uniform speed when multiple lifting systems operate simultaneously, guaranteeing the smooth lifting of the frame platform. A limit device is provided for automatic locking, preventing the wire rope from falling after the motor stops working. The system features convenient installation, high safety, and good stability.

[0004] Another technical problem to be solved by the present invention is to provide a method for intelligent lifting system of axial flow generator runner maintenance frame, which is used for lifting and hoisting the frame platform.

[0005] To achieve the above-mentioned technical features, the present invention aims to provide an intelligent lifting system for an axial-flow generator set runner maintenance frame, comprising a lifting device mounted on an annular base, the annular base mounted on a transition base, the lifting device including a lifting base, a motor, a reducer, and a drum, the motor, reducer, and drum being respectively mounted on the lifting base, the output shaft of the motor being connected to the output shaft of the reducer via a connecting device, the output shaft of the reducer being connected to one end of the drum for transmission, a weighing device being installed at the bottom of the lifting base and supported within the annular base, a limit device being installed at the other end of the input shaft of the reducer, and an encoder being installed at the other end of the drum.

[0006] The transition base includes a trapezoidal base frame, with a horizontal brace connected to the small end of the base frame, and diagonal braces connected to the two corners of the large end of the base frame. A lifting lug is installed on the upper side of the base frame, and a positioning post is installed at the bottom of the base frame.

[0007] The annular base includes an inner ring, an outer ring, and a bottom ring. The inner ring is fixed to the inner circumference of the bottom ring, and the outer ring is fixed to the outer circumference of the bottom ring. The inner ring, outer ring, and bottom ring are combined to form an annular groove.

[0008] Weighing devices are installed at the four corners of the lower side of the lifting base. Each weighing device includes a mounting block, a load cell, and a support leg. The upper end of the mounting block is fixedly connected to the lifting base. One end of the load cell is mounted on the mounting block, and the other end of the load cell is mounted on the support leg. Fixed connectors are installed at the four corners of the upper side of the lifting base. Each fixed connector includes a connecting chain and a U-shaped clip. One end of the connecting chain is fixedly connected to the lifting base, and the other end is fixedly connected to the U-shaped clip. Bolts are screwed onto the side wall of the U-shaped clip, which is used to connect and fix it to the annular base.

[0009] The connecting device includes a brake wheel and a drum brake. The two ends of the brake wheel are connected to the output shaft of the motor and the input shaft of the reducer, respectively. The drum brake is installed on the lifting base in cooperation with the brake wheel.

[0010] One end of the drum is connected to the output shaft of the reducer for transmission, and the other end is rotatably connected to the bearing seat. The bearing seat is mounted on the lifting base. The encoder is fixedly mounted on the bearing seat by a bracket, and the encoder shaft is connected to the drum for transmission.

[0011] The limiting device includes a first hinge seat, a limiting rod, a second hinge seat, and an electric push rod. A stop gear is installed at the other end of the reducer input shaft. The first and second hinge seats are installed on the lifting base and located on both sides of the stop gear. The fixed end of the electric push rod is hinged to the second hinge seat. One end of the limiting rod is hinged to the upper end of the first hinge seat, and the other end is hinged to the telescopic end of the electric push rod. The stop gear is provided with multiple stop grooves. The limiting rod is provided with a protruding stop block on one side corresponding to the stop gear. A limit switch seat is installed at the telescopic end of the electric push rod. When the telescopic end of the electric push rod retracts, the stop block can be inserted into one of the stop grooves, and the limit switch seat can press down the limit switch.

[0012] The telescopic end of the electric push rod is equipped with a buffer device, which is hinged to the limit rod. The buffer device includes a buffer rod, a buffer sleeve, and a spring. The buffer rod includes a mounting sleeve and a pull rod. The pull rod is fixed to the upper end of the mounting sleeve. The buffer rod is connected to the telescopic end of the electric push rod through the mounting sleeve. The pull rod passes into the buffer sleeve. The spring is set inside the buffer sleeve and fitted onto the pull rod. A limit ring and a nut are installed on the pull rod above the spring. The upper end of the buffer sleeve has a groove, and the limit rod is hinged to the upper end of the groove. The limit switch seat is installed on the pull rod of the buffer rod.

[0013] The lifting base is also equipped with a rope guide assembly, which is located on one side of the drum. The rope guide assembly includes two fixed seats, each of which is hinged to a swing arm via a pivot. A torsion spring is mounted on each of the two swing arms on the pivot. One end of the torsion spring abuts against the lifting base, and the other end abuts against the swing arm. A support rod is connected to the upper end of each swing arm. A rotating cylinder is mounted on the support rod, which is located between the two swing arms and on the outer side of the two swing arms. In the working state, the rotating cylinder abuts against the drum under the action of the torsion spring.

[0014] The method of using the intelligent lifting system for the maintenance frame of an axial-flow generator set runner, as described above, for lifting and hoisting the frame platform, includes the following steps:

[0015] S1. During operation, the metal aggregate of the frame platform must first be placed from the conical pipe inlet to the tailwater pipe, and then assembled into a circular frame platform at the bottom of the tailwater pipe.

[0016] S2. The four sets of intelligent lifting systems for the maintenance rack of the axial flow generator set are hoisted onto the support arm of the upper frame of the generator set in sequence. The four sets of intelligent lifting systems for the maintenance rack of the axial flow generator set are arranged symmetrically, and the positioning column at the bottom of the transition base is positioned and connected to the support arm.

[0017] S3. After determining the lifting point position of the circular frame platform, the lifting base is lifted sequentially by the bridge crane. The lifting base is manually rotated so that the direction of the wire rope on the drum is aligned with the lifting point direction of the circular frame platform. Then the lifting base is lowered and the U-shaped clip of the fixed connecting piece is fastened to the ring base bolt to limit the lifting base.

[0018] S4. The circular platform is lifted from the tailpipe to the cone gate using four sets of intelligent lifting systems for the maintenance rack of the axial-flow generator set. During lifting, the four sets of intelligent lifting systems for the maintenance rack of the axial-flow generator set lift synchronously. The encoder is used to detect the rotation speed of the drum and the speed control of the motor is controlled by the control box to ensure the smooth lifting of the circular platform. The weighing device detects the tension of the wire rope in real time. When the lifting is paused or the lifting is in place, the motor has a built-in brake to lock the rotor, the electric push rod of the limit device retracts, and the stop block is locked into one of the stop grooves.

[0019] The present invention has the following beneficial effects:

[0020] 1. The lifting base is positioned and installed on the support arm of the unit's upper frame. The lifting base is limited by the ring base, making installation simple and convenient. A weighing device is installed on the lower side of the lifting base to detect the tension of the wire rope in real time, ensuring the safety of the wire rope and system structure. The encoder detects the speed of the drum in real time, so that the speed of multiple lifting systems is uniform when running simultaneously, ensuring the smooth lifting of the frame platform. A limit device is provided, which automatically locks to prevent the wire rope from falling after the motor stops working, realizing the smooth and safe hoisting of the circular frame platform. It has the characteristics of convenient installation, high safety and good stability.

[0021] 2. The weighing device is used to detect the weight of the lifting device in real time. However, the change in the weight of the lifting device is caused by the tension in the wire rope, so the detection involves the tension in the wire rope. Fixed connecting parts are installed to flexibly secure the lifting device.

[0022] 3. The telescopic end of the electric push rod is equipped with a buffer device to prevent damage or deformation of parts caused by the stop block not being engaged in the stop groove.

[0023] 4. A rope guide assembly is also installed on the lifting base to ensure that the wire rope can be tightly wound onto the drum during winding and unwinding. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the transition base structure of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of mounting an annular base on the transition base of the present invention.

[0027] Figure 4 This is a schematic diagram of the main structure of the lifting device of the present invention.

[0028] Figure 5 This is a top view of the lifting device of the present invention.

[0029] Figure 6 This is a schematic diagram of the lifting device of the present invention from the left side.

[0030] Figure 7 for Figure 6 Enlarged structural diagram at point A in the middle.

[0031] Figure 8 This is a schematic diagram of the first hinge seat structure of the present invention.

[0032] Figure 9 This is a cross-sectional view of the buffer device of the present invention.

[0033] Figure 10 This is a schematic diagram of the guide rope assembly structure of the present invention.

[0034] In the diagram: Transition base 1, base frame 11, lifting lug 12, cross brace 13, diagonal brace 14, positioning column 15, annular base 2, inner ring 21, outer ring 22, bottom ring 23, lifting base 3, weighing device 31, mounting block 311, load cell 312, support leg 313, fixing link 33, connecting chain 331, U-shaped clip 332, motor 4, reducer 5, drum 6, bearing seat 61, encoder 62, wire rope 63, connecting device 7, limiting device 8, first hinge seat 81 Limiting rod 82, stop block 821, second hinge seat 83, electric push rod 84, buffer device 85, buffer rod 851, mounting sleeve 8511, pull rod 8512, buffer sleeve 852, slot 8521, spring 853, limiting ring 854, nut 855, limit switch seat 86, limit switch 87, stop gear 88, stop groove 881, guide rope assembly 9, fixed seat 91, swing arm 92, pivot 93, torsion spring 94, support rod 95, rotating cylinder 96, control box 10. Detailed Implementation

[0035] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0036] Example 1:

[0037] See Figure 1-10 A smart lifting system for the maintenance rack of an axial-flow generator set runner includes a lifting device mounted on an annular base 2, which is mounted on a transition base 1. The lifting device includes a lifting base 3, a motor 4, a reducer 5, and a drum 6. The motor 4, reducer 5, and drum 6 are respectively mounted on the lifting base 3. The output shaft of the motor 4 is connected to the output shaft of the reducer 5 via a connecting device 7. The output shaft of the reducer 5 is connected to one end of the drum 6. A weighing device 31 is installed at the bottom of the lifting base 3 and supported inside the annular base 2. A limit device 8 is installed at the other end of the input shaft of the reducer 5, and an encoder 62 is installed at the other end of the drum 6. The lifting base 3 is positioned and installed on the support arm of the upper frame of the unit via the transition base 1. The lifting base 3 is limited by the annular base 2, making installation simple and convenient. A weighing device 31 is installed on the underside of the lifting base 3 to monitor the tension of the wire rope 63 in real time, ensuring the safety of the wire rope 63 and the system structure. An encoder 62 monitors the rotational speed of the drum 6 in real time, ensuring uniform speed when multiple lifting systems operate simultaneously, guaranteeing the smooth lifting of the platform. A limit device 8 is provided for automatic locking, preventing the wire rope 63 from falling after the motor stops working. It features convenient installation, high safety, and good stability. The motor 4 is a variable frequency motor with a brake.

[0038] See Figure 2 The transition base 1 includes a trapezoidal base frame 11. A cross brace 13 is connected to the smaller end of the base frame 11, and diagonal braces 14 are connected to the two corners of the larger end of the base frame 11. A lifting lug 12 is installed on the upper side of the base frame 11, and positioning posts 15 are installed at the bottom of the base frame 11. The structure is simple and has good stability. Four positioning posts 15 are provided for easy installation and fixing. During use, corresponding holes are pre-drilled on the support arms of the unit's upper frame, and the positioning posts 15 are inserted into the holes for positioning.

[0039] See Figure 3 The annular base 2 includes an inner ring 21, an outer ring 22, and a bottom ring 23. The inner ring 21 is welded to the inner circumference of the bottom ring 23, and the outer ring 22 is welded to the outer circumference of the bottom ring 23. The inner ring 21, outer ring 22, and bottom ring 23 combine to form an annular groove. This facilitates the rotation and adjustment of the lifting device and allows for limiting the movement of the lifting device. The structure is simple and has good stability.

[0040] See Figure 4 Weighing devices 31 are installed at the four corners of the lower side of the lifting base 3. Each weighing device 31 includes a mounting block 311, a weighing sensor 312, and a support leg 313. The upper end of the mounting block 311 is fixedly connected to the lifting base 3. One end of the weighing sensor 312 is mounted on the mounting block 311, and the support leg 313 is installed on the lower side of the other end of the weighing sensor 312. Furthermore, fixing connectors 33 are installed at the four corners of the upper side of the lifting base 3. Each fixing connector 33 includes a connecting chain 331 and a U-shaped clip 332. One end of the connecting chain 331 is fixedly connected to the lifting base 3, and the other end is fixedly connected to the U-shaped clip 332. Bolts are screwed onto the side wall of the U-shaped clip 332, which is used to connect and fix it to the annular base 2. The weighing devices 31 are used to detect the weight of the lifting device in real time. However, the change in the weight of the lifting device is caused by the tension in the wire rope 63, thus the tension in the wire rope 63 can also be detected. A fixed connecting piece 33 is provided for flexibly securing the lifting device. Specifically, the load cell 312 is a resistance strain gauge load cell.

[0041] In a preferred embodiment, the connecting device 7 includes a brake wheel and a drum brake. The two ends of the brake wheel are connected to the output shaft of the motor 4 and the input shaft of the reducer 5, respectively. The drum brake is mounted on the lifting base 3 in cooperation with the brake wheel. The lifting device is braked by the cooperation of the brake wheel and the drum brake. Alternatively, the connecting device 7 can also be a coupling.

[0042] See Figure 1One end of the drum 6 is connected to the output shaft of the reducer 5 for transmission, and the other end is rotatably connected to the bearing seat 61. The bearing seat 61 is mounted on the lifting base 3. The encoder 62 is fixedly mounted on the bearing seat 61 via a bracket. The rotating shaft of the encoder 62 is connected to the drum 6 for transmission. The structure is simple and easy to install. The speed of the drum 6 is detected by the encoder 62, thereby controlling and adjusting the speed of the motor 4. Specifically, the encoder 62 is electrically connected to the PLC in the control box 10, the PLC is electrically connected to the frequency converter, and the frequency converter is electrically connected to the motor 4. In use, the encoders 62 and weighing sensors 312 of the four lifting systems are centrally controlled.

[0043] See Figure 6 , 7 The limiting device 8 includes a first hinge seat 81, a limiting rod 82, a second hinge seat 83, and an electric push rod 84. A stop gear 88 is installed at the other end of the input shaft of the reducer 5. The first hinge seat 81 and the second hinge seat 83 are mounted on the lifting base 3 and located on both sides of the stop gear 88. The fixed end of the electric push rod 84 is hinged to the second hinge seat 83. One end of the limiting rod 82 is hinged to the upper end of the first hinge seat 81, and the other end is hinged to the telescopic end of the electric push rod 84. The stop gear 88 has multiple stop grooves 881. The limiting rod 82 has a protruding stop block 821 on one side corresponding to the stop gear 88. A limit switch seat 86 is installed at the telescopic end of the electric push rod 84. When the telescopic end of the electric push rod 84 retracts, the stop block 821 can be engaged in one of the stop grooves 881, and the limit switch seat 86 can press down the limit switch 87. Through the above structure, the limiting rod 82 locks the stop gear 88. When motor 4 stops rotating, the telescopic end of electric push rod 84 retracts, pulling down limit rod 82, and stop block 821 engages in one of the stop grooves 881. When motor 4 soft-starts, the telescopic end of electric push rod 84 extends simultaneously, pushing limit rod 82 upward, and stop block 821 disengages from stop groove 881. The limit switch 87 serves to indicate the action signal of electric push rod 84.

[0044] Further, see Figure 6 , 9The telescopic end of the electric push rod 84 is equipped with a buffer device 85, which is hinged to the limit rod 82. The buffer device 85 is used to prevent damage or deformation of parts caused by the stop block 821 not being engaged in the stop groove 881. Specifically, the buffer device 85 includes a buffer rod 851, a buffer sleeve 852, and a spring 853. The buffer rod 851 includes a mounting sleeve 8511 and a pull rod 8512. The pull rod 8512 is fixed to the upper end of the mounting sleeve 8511. The buffer rod 851 is connected to the telescopic end of the electric push rod 84 through the mounting sleeve 8511. The pull rod 8512 passes into the buffer sleeve 852. The spring 853 is set inside the buffer sleeve 852 and fitted onto the pull rod 8512. A limit ring 854 and a nut 855 are installed on the pull rod 8512 above the spring 853. The upper end of the buffer sleeve 852 is provided with a slot 8521, and the limit rod 82 is hinged to the upper end of the slot 8521. The limit switch seat 86 is installed on the pull rod 8512 of the buffer rod 851. When the telescopic end of the electric push rod 84 retracts, it pulls down the limit rod 82. If the stop block 821 is not engaged in the stop groove 881, the buffer rod 851 moves down and the spring 853 retracts. When the system falls and causes the reducer 5 to reverse, the stop block 821 will be engaged in the stop groove 881 under the action of the spring 853 to prevent the accident from happening.

[0045] See Figure 5 , 10 To ensure that the wire rope 63 is tightly wound onto the drum 6 during winding and unwinding, a rope guide assembly 9 is also installed on the lifting base 3, located on one side of the drum 6. Specifically, the rope guide assembly 9 includes two fixed seats 91, each hinged to a swing arm 92 via a pivot 93. Torsion springs 94 are mounted on the swing arms 92 on both sides of the pivot 93. One end of each torsion spring 94 abuts against the lifting base 3, and the other end abuts against the swing arm 92. Support rods 95 are connected to the upper ends of the swing arms 92. Rotating cylinders 96 are rotatably mounted on the support rods 95, located between and outside the swing arms 92. In operation, the rotating cylinders 96 abut against the drum 6 under the action of the torsion springs 94.

[0046] Example 2:

[0047] The method of using the intelligent lifting system for the maintenance frame of an axial-flow generator set runner, as described above, for lifting and hoisting the frame platform, includes the following steps:

[0048] S1. During operation, the metal aggregate of the frame platform must first be placed from the conical inlet to the tailwater pipe, and then assembled into a circular frame platform at the bottom of the tailwater pipe.

[0049] S2. The four sets of intelligent lifting systems for the maintenance rack of the axial-flow generator set are hoisted sequentially onto the support arm of the upper frame of the generator set. The four sets of intelligent lifting systems for the maintenance rack of the axial-flow generator set are arranged symmetrically, and the positioning column 15 at the bottom of the transition base 1 is positioned and connected to the support arm.

[0050] S3. After determining the lifting point position of the circular frame platform, the lifting base 3 is lifted sequentially by the bridge crane. The lifting base 3 is manually rotated so that the direction of the wire rope 63 on the drum 6 is aligned with the direction of the lifting point of the circular frame platform. Then the lifting base 3 is lowered and the U-shaped clip 332 of the fixed connecting piece 33 is bolted to the annular base 2 to limit the lifting base 3.

[0051] S4. The circular frame platform is lifted from the tailpipe to the cone gate using four sets of intelligent lifting systems for the maintenance rack of the axial-flow generator set. During the lifting, the four sets of intelligent lifting systems for the maintenance rack of the axial-flow generator set lift synchronously. The encoder 62 is used to detect the rotation speed of the drum 6 and the speed control of the motor 4 is controlled by the control box 10 to ensure the smooth lifting of the circular frame platform. The weighing device 31 detects the tension of the wire rope 63 in real time. When the lifting is paused or the lifting is in place, the motor 4 has a built-in brake to lock the rotor, the telescopic end of the electric push rod 84 of the limit device 8 retracts, and the stop block 821 is engaged in one of the stop grooves 881.

[0052] The above method enables the stable and safe hoisting of the circular frame platform, featuring convenient installation, high safety, and good stability.

Claims

1. An intelligent lifting system for the maintenance frame of an axial-flow generator set runner, characterized in that: The device includes a lifting device mounted on an annular base (2), which is mounted on a transition base (1). The lifting device includes a lifting base (3), a motor (4), a reducer (5), and a drum (6). The motor (4), reducer (5), and drum (6) are mounted on the lifting base (3). The output shaft of the motor (4) is connected to the output shaft of the reducer (5) via a connecting device (7). The output shaft of the reducer (5) is connected to one end of the drum (6). A weighing device (31) is installed at the bottom of the lifting base (3). The weighing device (31) is supported inside the annular base (2). A limit device (8) is installed at the other end of the input shaft of the reducer (5). An encoder (62) is installed at the other end of the drum (6). The limiting device (8) includes a first hinge seat (81), a limiting rod (82), a second hinge seat (83), and an electric push rod (84). A stop gear (88) is installed at the other end of the input shaft of the reducer (5). The first hinge seat (81) and the second hinge seat (83) are mounted on the lifting base (3) and located on both sides of the stop gear (88). The fixed end of the electric push rod (84) is hinged to the second hinge seat (83), and one end of the limiting rod (82) is hinged to the first hinge seat (81). The upper end is hinged to the telescopic end of the electric push rod (84). The stop gear (88) is provided with multiple stop grooves (881). The limit rod (82) is provided with a protruding stop block (821) on one side corresponding to the stop gear (88). The telescopic end of the electric push rod (84) is equipped with a limit switch seat (86). When the telescopic end of the electric push rod (84) is retracted, the stop block (821) can be inserted into one of the stop grooves (881), and the limit switch seat (86) can press down the limit switch (87). The telescopic end of the electric push rod (84) is equipped with a buffer device (85), which is hinged to the limiting rod (82). The buffer device (85) includes a buffer rod (851), a buffer sleeve (852), and a spring (853). The buffer rod (851) includes a mounting sleeve (8511) and a pull rod (8512). The pull rod (8512) is fixed to the upper end of the mounting sleeve (8511). The buffer rod (851) is connected to the telescopic end of the electric push rod (84) through the mounting sleeve (8511). The pull rod (8512) is inserted into the buffer sleeve (852), and the spring (853) is set inside the buffer sleeve (852) and fitted onto the pull rod (8512). A limit ring (854) and a nut (855) are installed on the pull rod (8512) above the spring (853). The upper end of the buffer sleeve (852) is provided with a slot (8521), and the limit rod (82) is hinged to the upper end of the slot (8521). The limit switch seat (86) is installed on the pull rod (8512) of the buffer rod (851).

2. The intelligent lifting system for the maintenance frame of an axial-flow generator set runner according to claim 1, characterized in that: The transition base (1) includes a trapezoidal base frame (11), with a cross brace (13) connected to the small end of the base frame (11), and diagonal braces (14) connected to the two corners of the large end of the base frame (11). A lifting lug (12) is installed on the upper side of the base frame (11), and a positioning column (15) is installed at the bottom of the base frame (11).

3. The intelligent lifting system for the maintenance frame of an axial-flow generator set runner according to claim 1, characterized in that: The annular base (2) includes an inner ring (21), an outer ring (22) and a bottom ring (23). The inner ring (21) is fixed to the inner circumference of the bottom ring (23), and the outer ring (22) is fixed to the outer circumference of the bottom ring (23). The inner ring (21), the outer ring (22) and the bottom ring (23) are combined to form an annular groove.

4. The intelligent lifting system for the maintenance frame of an axial-flow generator set runner according to claim 2, characterized in that: Weighing devices (31) are installed at the four corners of the lower side of the lifting base (3). The weighing devices (31) include mounting blocks (311), weighing sensors (312), and support legs (313). The upper end of the mounting block (311) is fixed to the lifting base (3). One end of the weighing sensor (312) is mounted on the mounting block (311), and the support leg (313) is installed on the lower side of the other end of the weighing sensor (312). Fixed connectors (33) are installed at the four corners of the upper side of the lifting base (3). The fixed connectors (33) include connecting chains (331) and U-shaped clips (332). One end of the connecting chain (331) is connected and fixed to the lifting base (3), and the other end is connected and fixed to the U-shaped clip (332). Bolts are screwed onto the side wall of the U-shaped clip (332). The U-shaped clip (332) is used to connect and fix to the annular base (2).

5. The intelligent lifting system for the maintenance frame of an axial-flow generator set runner according to claim 1, characterized in that: The connecting device (7) includes a brake wheel and a drum brake. The two ends of the brake wheel are connected to the output shaft of the motor (4) and the input shaft of the reducer (5), respectively. The drum brake is installed on the lifting base (3) in cooperation with the brake wheel.

6. The intelligent lifting system for the maintenance frame of an axial-flow generator set runner according to claim 1, characterized in that: One end of the drum (6) is connected to the output shaft of the reducer (5) for transmission, and the other end is rotatably connected to the bearing seat (61). The bearing seat (61) is mounted on the lifting base (3). The encoder (62) is fixedly mounted on the bearing seat (61) by a bracket. The rotating shaft of the encoder (62) is connected to the drum (6) for transmission.

7. The intelligent lifting system for the maintenance frame of an axial-flow generator set runner according to claim 1, characterized in that: The lifting base (3) is also equipped with a rope guide assembly (9), which is located on one side of the drum (6). The rope guide assembly (9) includes two fixed seats (91), and the two fixed seats (91) are respectively hinged to a swing arm (92) via a pivot (93). The swing arms (92) on both sides of the pivot (93) are respectively fitted with torsion springs (94). One end of the torsion spring (94) abuts against the lifting base (3), and the other end abuts against the swing arm (92). The upper ends of the two swing arms (92) are connected to a support rod (95). A rotating cylinder (96) is installed on the support rod (95) between the two swing arms (92) and on the outside of the two swing arms (92). In the working state, the rotating cylinder (96) abuts against the drum (6) under the action of the torsion spring (94).

8. A method for using the intelligent lifting system for the maintenance frame of an axial-flow generator set runner as described in claim 4, used for lifting and hoisting the frame platform, characterized in that... Includes the following steps: S1. During operation, the metal aggregate of the frame platform must first be placed from the conical pipe inlet to the tailwater pipe, and then assembled into a circular frame platform at the bottom of the tailwater pipe. S2. The four sets of axial flow generator set wheel maintenance rack intelligent lifting systems are hoisted to the support arm of the upper frame of the generator set in sequence. The four sets of axial flow generator set wheel maintenance rack intelligent lifting systems are arranged symmetrically, and the positioning column (15) at the bottom of the transition base (1) is positioned and connected to the support arm. S3. After determining the lifting point position of the circular frame platform, the lifting base (3) is lifted in sequence by the bridge crane. The lifting base (3) is manually rotated so that the direction of the wire rope (63) on the drum (6) is aligned with the direction of the lifting point of the circular frame platform. Then the lifting base (3) is lowered and the U-shaped clip (332) of the fixed connecting piece (33) is bolted to the ring base (2) to limit the lifting base (3). S4. The circular frame platform is lifted from the tailpipe to the cone gate using four sets of axial-flow generator set wheel maintenance frame intelligent lifting systems. During the lifting, the four sets of axial-flow generator set wheel maintenance frame intelligent lifting systems lift synchronously. Among them, the encoder (62) is used to detect the rotation speed of the drum (6) and the motor (4) is controlled by the control box (10) to ensure that the circular frame platform is lifted smoothly. The weighing device (31) detects the tension of the wire rope (63) in real time. When the lifting is paused or the lifting is in place, the motor (4) has its own brake to lock the rotor. The electric push rod (84) of the limit device (8) retracts and the stop block (821) is inserted into one of the stop grooves (881).

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