Automatic discing equipment and method for a hydroelectric generator rotor

Abstract

The application discloses a kind of automatic turning gear equipment and method for the rotor of hydroelectric power station generator, it is related to generator set turning gear technical field.The base structure is slidably fitted with scissor lifting mechanism on the base structure, the scissor lifting mechanism is cooperated with lifting power device installed on the base structure, the top of scissor lifting mechanism is installed with lifting seat, the top of lifting seat is fixedly installed with the turning gear wheel assembly for being contacted with the rotor bottom end to be turned, and the turning gear wheel assembly is cooperated with the turning gear power device installed on the top of lifting seat.Through modularization, light weight design, the automatic turning operation of rotor is realized, the problems such as large labor intensity, low efficiency, poor portability, insufficient positioning accuracy and the like in the prior art are solved, and the maintenance operation efficiency and safety are improved.

Description

Technical Field

[0001] This invention relates to the field of bearing cooling equipment technology, specifically to an automatic turning device and method for the rotor of a hydropower station generator. Background Technology

[0002] During the maintenance of hydropower station generator units, it is often necessary to rotate the generator rotor to move the equipment to be inspected (such as oil coolers, push-pull oil pumps, high-pressure oil pumps, etc.) in the wind tunnel to a position that facilitates maintenance. Currently, rotor rotation in hydropower stations is mostly done manually using traditional methods, such as hand-operated hoists. However, existing technology has the following shortcomings: (1) High labor intensity and low efficiency: Manual turning of the machine requires multiple operators to work together and pull the rotor point by point using tools such as hand hoists, which is time-consuming and labor-intensive, resulting in low work efficiency.

[0003] (2) Large size and poor portability: Some existing mechanical turning equipment is large in size and heavy in weight, making it difficult to transport and install in the space-constrained wind tunnel, and thus failing to meet the needs of flexible on-site operations.

[0004] (3) Poor positioning accuracy: The manual turning method makes it difficult to accurately control the rotor rotation angle, resulting in a large positioning error that cannot meet the positioning requirements of high-precision maintenance operations.

[0005] (4) Significant safety hazards: During the manual rotation process, operators need to operate large rotating equipment at close range, which poses a significant safety risk and is prone to personal injury accidents. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an automatic turning equipment and method for generator rotors in hydropower stations. Through modular and lightweight design, it achieves automated turning operation of the rotor, solving problems such as high labor intensity, low efficiency, poor portability, and insufficient positioning accuracy in existing technologies, thereby improving maintenance efficiency and safety.

[0007] To achieve the above-mentioned technical features, the present invention aims to provide an automatic turning device for a generator rotor in a hydropower station, comprising a base structure, on which a scissor lifting mechanism is slidably mounted, the scissor lifting mechanism cooperating with a lifting power device mounted on the base structure, a lifting seat mounted on the top of the scissor lifting mechanism, and a turning wheel assembly fixedly mounted on the top of the lifting seat for contacting and cooperating with the bottom end of the rotor to be turned, the turning wheel assembly cooperating with the turning power device mounted on the top of the lifting seat.

[0008] Preferably, the base structure includes a base body, and the two sides of the base body are symmetrically machined with bottom grooves for sliding cooperation with the bottom of the scissor lift mechanism; The lifting seat has symmetrically machined top grooves on both sides for sliding engagement with the top of the scissor lift mechanism.

[0009] Preferably, the scissor lift mechanism includes a first scissor bar and a second scissor bar hinged together in the middle. The bottom end of the first scissor bar is fixedly connected to a first crossbar, and the bottom end of the second scissor bar is fixedly connected to a second crossbar. The two ends of the first and second crossbars are respectively slidably engaged with bottom grooves via corresponding bottom sliders. The top ends of the first and second scissor bars are slidably engaged with top grooves via corresponding slide bars and top sliders.

[0010] Preferably, the lifting power device includes a double-ended screw rotatably mounted between the base bodies via bearings. The two ends of the double-ended screw are machined with reverse threads and form threaded transmission engagements with the first nut seat and the second nut seat, respectively. The first nut seat is installed in the middle of the first crossbar, and the second nut seat is installed in the middle of the second crossbar. The end of the double-ended screw is connected to the main shaft of the first reducer fixed on the base body, and the first reducer is connected to the first motor.

[0011] Preferably, an electrical control cabinet is fixed to one side of the top of the base structure; the electrical control cabinet is connected to the scissor lift mechanism and the lifting power device and controls the corresponding actions.

[0012] Preferably, a brush plate is fixed to the top of the base structure and to both sides of the disc wheel assembly, and a brush is fixed to the top of the brush plate.

[0013] Preferably, the disc wheel assembly includes two sets of symmetrically fixed bearings on the top of the lifting seat. A first wheel axle is rotatably mounted between one set of bearings, and a second wheel axle is rotatably mounted between the other set of bearings. A pair of first friction wheels are fixedly mounted on the first wheel axle, and a pair of second friction wheels are fixedly mounted on the second wheel axle.

[0014] Preferably, the turning gear power unit adopts a synchronous belt drive or a synchronous chain drive.

[0015] Preferably, the synchronous belt drive includes a second reducer connected to the first wheel shaft, the second reducer being connected to a second motor, a first pulley being fixed at the middle part of the first wheel shaft, the first pulley being connected to the second pulley via a belt, and the second pulley being fixed on the second wheel shaft.

[0016] Preferably, the synchronous chain drive device includes an intermediate shaft rotatably mounted on the middle part of the top of the lifting seat. The intermediate shaft is connected to the output shaft of the third reducer. The input shaft of the third reducer is connected to the output shaft of the third motor. The intermediate shaft is driven by meshing with the first wheel shaft through the first synchronous chain mechanism. The intermediate shaft is driven by meshing with the second wheel shaft through the second synchronous chain mechanism.

[0017] Preferably, the bottom of the base structure is fitted with a modular support leg structure; the modular support leg structure includes a U-shaped seat fixed to the bottom of the base structure, the bottom end of the U-shaped seat is hinged to a modular support leg, the bottom end of the modular support leg is hinged to a modular base frame, and fastening clamps are installed at the four corners of the modular base frame.

[0018] Another aspect of the present invention provides a turning method for an automatic turning device for a generator rotor in a hydropower station, comprising the following steps: Step 1, Equipment Transfer: Manually move the disassembled automatic turning gear equipment components to the working position inside the generator rotor wind tunnel, retract the scissor lift mechanism to the lowest height, and move each component separately. Step 2, On-site assembly: Assemble the base structure on-site in sequence, fix the base structure to the frame legs, and arrange two automatic turning machines facing each other to ensure symmetrical distribution; Step 3, Lifting of the disc wheel assembly: Operate the scissor lift mechanism to raise the disc wheel assembly to press against the lower edge of the rotor, ensuring sufficient contact pressure. The two automatic disc wheels are lifted synchronously to ensure uniform force distribution. Step 4, Rotor rotation: Start the synchronous belt drive device, and the opposing rotating wheel assemblies rotate synchronously. The rotor is driven to rotate by friction. The rotation angle is precisely controlled by the control cabinet to achieve precise positioning of the rotor, thereby rotating the equipment to be repaired to the designated position.

[0019] The present invention has the following beneficial effects: 1. This invention adopts a motor-driven friction wheel automatic turning structure to replace the traditional manual hoist traction method. It can automatically complete the rotation and positioning of the rotor, greatly reducing the number of operators and labor intensity. The dual equipment synchronous drive can realize the stable rotation of large-tonnage rotors, and the work efficiency is several times higher than that of manual methods.

[0020] 2. The invention adopts a detachable modular structure. The splicing base frame, splicing legs and other components can be disassembled and transported. The weight of a single component is controlled within the range that can be carried by man. It can enter the space-constrained generator wind tunnel for operation without the need for large lifting equipment, and is suitable for the complex working environment of hydropower station sites.

[0021] 3. This invention uses a scissor lift mechanism to adjust the height of the rotating wheel, and is combined with a double-headed screw-driven lifting power device. The lifting process has good synchronization and high support rigidity, which can stably maintain the contact pressure between the friction wheel and the lower edge of the rotor, avoid slippage and uneven load during the rotating process, and ensure the reliability of friction transmission.

[0022] 4. This invention centrally controls the lifting motor and the turning gear motor through the electrical control cabinet, which can accurately adjust the turning gear speed and rotation angle, with a positioning error of no more than ±1°, meeting the positioning requirements of high-precision maintenance operations in hydropower stations.

[0023] 5. This invention uses fastening clamps to fix the machine on the on-site frame legs, eliminating the need for additional foundations or embedded parts, and allowing for fast on-site assembly and fixing. The automated turning method significantly reduces the time that operators spend in close contact with the rotating equipment, effectively reducing safety risks and ensuring the personal safety of operators.

[0024] 6. This invention offers two power options for rotating rotors: synchronous belt drive and synchronous chain drive, as well as two installation methods: side-mounted base bracket and top-mounted assembly legs. These options can be flexibly selected based on rotor tonnage and on-site installation space, making it widely applicable. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a first-person 3D view of the automatic turning equipment using a synchronous belt drive device according to the present invention.

[0027] Figure 2 This is a second-view 3D diagram of the automatic turning equipment using a synchronous belt drive device according to the present invention.

[0028] Figure 3 This is a third-person 3D view of the automatic turning equipment using a synchronous belt drive device according to the present invention.

[0029] Figure 4 This is a fourth-view 3D diagram of the automatic turning equipment using a synchronous belt drive device according to the present invention.

[0030] Figure 5 This is a first-person 3D view of the on-site installation operation of the automatic turning equipment using a synchronous belt drive device according to the present invention.

[0031] Figure 6 This is a second-view 3D diagram showing the on-site installation of the automatic turning equipment using a synchronous belt drive device according to the present invention.

[0032] Figure 7 This is a first-view 3D diagram of the automatic turning equipment using a synchronous chain drive device according to the present invention.

[0033] Figure 8 This is a first-person 3D view of the on-site installation operation of the automatic turning equipment using the synchronous chain drive device of the present invention.

[0034] Figure 9 This is a second-view 3D diagram showing the on-site installation of the automatic turning equipment using a synchronous chain drive device according to the present invention.

[0035] In the diagram: 1. Base structure; 2. Lifting power unit; 3. Scissor lift mechanism; 4. Electrical control cabinet; 5. Brush plate; 6. Brush; 7. Disc wheel assembly; 8. Synchronous belt drive device; 9. Lifting seat; 10. Rotor; 11. Base bracket; 12. Frame support leg; 13. Air damper; 14. Synchronous chain drive device; 15. Assembled support leg structure. Base body 101, bottom slide 102; First motor 201, first reducer 202, first crossbar 203, first nut seat 204, second crossbar 205, second nut seat 206, double-ended screw 207; Bottom slider 301, first scissor bar 302, second scissor bar 303, top slider 304; First friction wheel 701, first wheel axle 702, axle seat 703, second friction wheel 704, second wheel axle 705; Second motor 801, second reducer 802, first pulley 803, belt 804, second pulley 805; Top slide 901; The third motor 1401, the third reducer 1402, the first synchronous chain mechanism 1403, the second synchronous chain mechanism 1404, and the intermediate shaft 1405; U-shaped base 1501, splicing support leg 1502, fastening clamp 1503, splicing base frame 1504. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] To facilitate understanding of the present invention, a more complete description will be given below with reference to relevant descriptions. Several embodiments of the invention are provided. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0038] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Example 1 Please see Figure 1-6 This embodiment is a lightweight and portable implementation, providing an automatic turning equipment for hydropower station generator rotors using a synchronous belt drive device 8, suitable for wind tunnel maintenance turning operations of small and medium tonnage generator rotors.

[0041] In this embodiment, the base structure 1 of the entire equipment is fixedly installed on the top surface of the base bracket 11 by bolts, and the base bracket 11 is fixed to the outer side wall of the frame support leg 12; the equipment is arranged on the side of the air damper 13, and the turning wheel assembly 7 is located directly below the lower edge of the rotor 10, without interfering with the original equipment. During on-site operation, two sets of automatic turning equipment described in this embodiment are arranged symmetrically opposite to each other along the rotor 10 to form a dual-point synchronous tangential drive layout.

[0042] Furthermore, the base structure 1 includes two parallel elongated base bodies 101. The inner sides of both base bodies 101 are symmetrically machined with bottom grooves 102 along their length to guide the bottom sliding of the scissor lift mechanism 3. Limiting structures are provided at both ends of the grooves to prevent the slider from dislodging. A lifting power device 2 is installed between one end of the two base bodies 101. The lifting power device 2 includes a first motor 201, the output end of which is connected to a first reducer 202. The housing of the first reducer 202 is fixed to the end of the base body 101, and its output shaft is connected to one end of a double-ended screw 207. The double-ended screw 207 is rotatably supported between the two base bodies 101 via bearing seats. Two sections of the screw body are machined with trapezoidal external threads in opposite directions, respectively forming a screw-nut transmission engagement with the first nut seat 204 and the second nut seat 206. The first nut seat 204 is fixedly installed in the middle of the first crossbar 203, and the second nut seat 206 is fixedly installed in the middle of the second crossbar 205. The first crossbar 203 and the second crossbar 205 are parallel to each other and are both perpendicular to the base body 101.

[0043] Furthermore, the scissor lift mechanism 3 includes at least two sets of parallel scissor arm units, each set of scissor arm units consisting of a first scissor bar 302 and a second scissor bar 303 hinged at the center. The bottom end of the first scissor bar 302 is fixedly connected to the first crossbar 203, and the bottom end of the second scissor bar 303 is fixedly connected to the second crossbar 205. Bottom sliders 301 are installed at both ends of the first crossbar 203 and the second crossbar 205, and the bottom sliders 301 are correspondingly embedded in the bottom slide grooves 102, and can slide back and forth along the slide grooves. The top ends of the first scissor bar 302 and the second scissor bar 303 are connected to top sliders 304 through slide rods, and the top sliders 304 are correspondingly embedded in the top slide grooves 901 on both sides of the lifting seat 9. When the double-ended screw 207 rotates forward, the two nut seats drive the two crossbars to move towards each other, the scissor arms unfold, and the lifting seat 9 rises vertically; when the double-ended screw 207 rotates in reverse, the two crossbars move away from each other, the scissor arms retract, and the lifting seat 9 descends vertically; the trapezoidal thread has a self-locking characteristic, and can stably maintain the lifting height after the machine stops. In this embodiment, the effective lifting stroke of the scissor lifting mechanism 3 is 120~180mm, which can adapt to different rotor lower edge height deviations, and the rated lifting load of a single set of equipment is not less than 5t.

[0044] Furthermore, a disc wheel assembly 7 is fixedly installed on the top surface of the lifting seat 9. The disc wheel assembly 7 includes two sets of symmetrically fixed bearings 703 on the top surface of the lifting seat 9. One set of bearings 703 rotatably supports a first wheel axle 702, and the other set of bearings 703 rotatably supports a second wheel axle 705. Two first friction wheels 701 are fixedly installed on the first wheel axle 702, and two second friction wheels 704 are fixedly installed on the second wheel axle 705. The top surfaces of the four friction wheels are coplanar and contact the lower edge end face of the rotor 10. The friction wheels adopt a metal hub with polyurethane coating. The coating layer has a Shore hardness of 60~70A and a friction coefficient of not less than 0.45, which ensures sufficient tangential friction force and avoids scratching the machined surface of the lower edge of the rotor. The friction wheels are fixed by a flat key and a shaft end retaining ring to prevent circumferential slippage and axial movement.

[0045] Furthermore, the synchronous belt drive device 8, serving as a turning gear power device, is installed on the top surface of the lifting platform 9. It includes a second motor 801 fixed to the end of the lifting platform 9, with its output end connected to a second reducer 802. The output shaft of the second reducer 802 is connected to one end of the first wheel axle 702. A first pulley 803 is fixed to the middle of the first wheel axle 702, and a second pulley 805 is correspondingly fixed to the middle of the second wheel axle 705. The first pulley 803 and the second pulley 805 are synchronously driven by a belt 804, ensuring that the two wheel axles rotate at the same speed and in the same direction. This drives the four friction wheels to rotate synchronously, and the rotor 10 rotates through friction. This embodiment uses a toothed synchronous belt, which has an accurate transmission ratio, low operating noise, and requires no lubrication, making it suitable for the clean working environment inside a wind tunnel.

[0046] Furthermore, an electrical control cabinet 4 is fixed to one side of the top surface of the base structure 1. The electrical control cabinet 4 has a built-in control module, which is electrically connected to the first motor 201 and the second motor 801, respectively. It can realize lifting start and stop, speed adjustment, as well as turning start and stop, speed adjustment, and precise angle control. The control cabinet panel is equipped with operation buttons and status indicator lights for easy on-site operation. The motor has a built-in absolute encoder, and the rotation angle control accuracy of the rotor 10 can reach ±0.8°. The two sets of opposing equipment communicate synchronously through the bus, and the speed synchronization error is no more than 0.5%, avoiding torsional load on the rotor.

[0047] Furthermore, a brush plate 5 is fixed on the top surface of the base structure 1 and on both sides of the disc wheel assembly 7. A brush 6 is fixed on the top of the brush plate 5. The top of the brush 6 is slightly higher than the top surface of the friction wheel by 2~3mm. During the disc wheel operation, the dust and oil on the lower edge of the rotor 10 can be cleaned in advance to ensure the friction surface is clean and maintain stable friction transmission performance.

[0048] The automatic turning operation process of the turning equipment described in this embodiment is as follows: Step 1, Equipment Transfer: The entire set of equipment is disassembled into independent components such as base structure 1, scissor lift mechanism 3, lifting seat 9, electrical control cabinet 4, and base support 11. The maximum weight of a single component is controlled within 25kg. The equipment is then manually transported by operators to the designated working position inside the generator wind tunnel without the need for large lifting equipment.

[0049] Step 2, on-site assembly: First, fix the base bracket 11 to the outer wall of the frame support leg 12, and then assemble the base structure 1, scissor lift mechanism 3, lifting seat 9 and upper components in sequence to complete the assembly of a single set of equipment; install the second set of equipment symmetrically on the opposite side of the rotor 10, ensuring that the friction wheels of the two sets of equipment are aligned with the lower edge of the rotor 10, with a symmetry deviation of no more than 2mm, to ensure that the driving force is transmitted tangentially along the rotor.

[0050] Step 3, Lifting of the scissor lift assembly: The first motor 201 is started by controlling the electrical control cabinet 4, driving the scissor lift mechanism 3 to slowly rise, so that the first friction wheel 701 and the second friction wheel 704 press against the lower edge of the rotor 10. The contact pressure is detected by the motor current, and the lifting automatically stops when the drive current reaches the preset threshold to ensure sufficient contact pressure. During the lifting process, the two sets of equipment move synchronously to ensure that the rotor 10 is subjected to uniform force. After the lifting is in place, the scissor lift mechanism 3 can be locked by a mechanical locking structure to improve the safety of operation.

[0051] Step 4, Rotor rotation: Set the rotation speed and target rotation angle through the electrical control cabinet 4, start the second motor 801, and drive the two sets of friction wheels to rotate synchronously through the synchronous belt transmission device 8. Relying on friction, the rotor 10 rotates smoothly. When approaching the target angle, it automatically switches to low-speed crawling mode. After reaching the set angle, it automatically stops and locks. The positioning error is no more than ±0.8°, realizing the precise positioning of the rotor 10 and rotating the equipment to be repaired to a position that is convenient for operation.

[0052] After the operation is completed, control the scissor lift mechanism 3 to descend, so that the friction wheel is disengaged from the rotor 10. Then, disassemble each component in sequence and move it out of the wind tunnel.

[0053] Example 2 Please see Figure 7-9 This embodiment is a heavy-duty stable implementation, providing an automatic turning equipment for hydropower station generator rotors using a synchronous chain drive device 14, which is suitable for turning operations of large-tonnage generator rotors in wind tunnels.

[0054] The main structure of this embodiment is basically the same as that of embodiment 1. The difference is that the turning gear power unit adopts a synchronous chain drive device 14, and the equipment is directly fixed to the top of the frame support leg 12 through the assembled support leg structure 15, which has a stronger load-bearing capacity and is suitable for heavy-duty working conditions.

[0055] In this embodiment, the entire set of equipment is directly supported and fixed on the top surface of the frame support leg 12 by the modular support leg structure 15, and arranged on the side of the air gate 13. The disc wheel assembly 7 is located directly below the lower edge of the rotor 10. On site, two sets of equipment are also arranged symmetrically facing each other, synchronously driving the rotor 10 to rotate. The rated lifting load of a single set of equipment is not less than 15t, which can be adapted to large generator rotors with a total weight of more than 300t.

[0056] Furthermore, the synchronous chain drive device 14, serving as a turning power device, is installed on the top surface of the lifting seat 9. It includes a third motor 1401 fixed in the center of the top surface of the lifting seat 9. The output end of the third motor 1401 is connected to a third reducer 1402. The output shaft of the third reducer 1402 is connected to an intermediate shaft 1405, which is rotatably supported on the top surface of the lifting seat 9 via bearing seats. Both ends of the intermediate shaft 1405 are equipped with drive sprockets. One end engages with the sprocket on the first axle 702 via a first synchronous chain mechanism 1403, and the other end engages with the sprocket on the second axle 705 via a second synchronous chain mechanism 1404, forming a dual-path synchronous chain drive structure. Compared to synchronous belt drives, chain drives transmit larger torques, have accurate transmission ratios without slippage, and strong overload capacity, meeting the turning power requirements of large-tonnage rotors. The dual-output structure of the intermediate shaft 1405 ensures consistent synchronicity of the chains on both sides, guaranteeing complete synchronization of the rotation speeds of the two axles.

[0057] Furthermore, the modular support leg structure 15 includes four sets of U-shaped seats 1501 correspondingly arranged at the four corners of the bottom of the base structure 1. The top of the U-shaped seats 1501 is fixedly connected to the bottom surface of the base structure 1, and the lower part of the U-shaped seats 1501 is hinged to the top of the modular support leg 1502 via a hinge shaft. The bottom of the modular support leg 1502 is hinged to the modular base frame 1504 via a hinge shaft. The modular base frame 1504 is a detachable frame-type modular structure that can be disassembled into multiple rods for easy manual handling. Fastening clamps 1503 are installed at the four corners of the modular base frame 1504. The fastening clamps 1503 adopt a hook bolt clamping structure, which can quickly clamp and fix them to the top edge of the frame support leg 12 without additional drilling or pre-embedded foundation. The 1502 splicing legs can be selected with different length specifications according to the height of the frame legs on site to adapt to different installation height requirements; the hinged connection method can automatically adjust the support angle to ensure uniform force distribution and improve the overall structural stability.

[0058] In this embodiment, the remaining structures, connections, and functions of the base structure 1, lifting power device 2, scissor lift mechanism 3, lifting seat 9, disc wheel assembly 7, electrical control cabinet 4, brush plate 5, and brush 6 are exactly the same as in embodiment 1, and will not be described again here.

[0059] The automatic turning equipment described in this embodiment performs the following turning operation: Step 1, Equipment Transfer: The equipment is disassembled into independent components such as base structure 1, scissor lift mechanism 3, lifting seat 9, splicing support leg 1502, splicing base frame 1504, and electrical control cabinet 4. The weight of each component is controlled within the range that can be handled manually, so that it can enter the wind tunnel without the need for lifting equipment.

[0060] Step 2, on-site splicing and assembly: First, assemble the splicing base frame 1504 on the top surface of the frame support leg 12, and clamp and fix it with the four corner fasteners 1503; then install the splicing support leg 1502, base structure 1, scissor lift mechanism 3 and the upper components in sequence to complete the assembly of a single set of equipment; assemble the second set of equipment symmetrically on the opposite side of the rotor 10 to ensure symmetrical position and balanced force.

[0061] Step 3, Lifting of the disc wheel assembly: The operation process is the same as in Example 1. The scissor lift mechanism 3 is controlled by the electrical control cabinet 4 to lift the disc wheel assembly 7 until it is pressed against the lower edge of the rotor 10. The contact pressure is controlled by current feedback. The two sets of equipment are lifted synchronously to ensure that the rotor is subjected to uniform force.

[0062] Step 4, Rotor rotation: Start the third motor 1401, which drives the intermediate shaft 1405 to rotate after being reduced in speed by the third reducer 1402. Then, through the first synchronous chain mechanism 1403 and the second synchronous chain mechanism 1404, the first wheel shaft 702 and the second wheel shaft 705 are rotated synchronously, which in turn drives the friction wheel to rotate synchronously. The rotor 10 is rotated smoothly by relying on friction. The rotation angle is precisely controlled by the electrical control cabinet 4. After reaching the target position, the machine automatically stops and locks, completing the rotation positioning.

[0063] After the work is completed, disassemble each component in the order of disassembly and remove it from the work site.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic turning device for a generator rotor in a hydropower station, characterized in that, The system includes a base structure (1), on which a scissor lift mechanism (3) is slidably mounted. The scissor lift mechanism (3) is in cooperation with a lifting power device (2) mounted on the base structure (1). A lifting seat (9) is mounted on the top of the scissor lift mechanism (3). A wheel assembly (7) for contacting and cooperating with the bottom end of the rotor (10) to be rotated is fixedly mounted on the top of the lifting seat (9). The wheel assembly (7) is in cooperation with the wheel power device mounted on the top of the lifting seat (9).

2. The automatic turning equipment for a generator rotor in a hydropower station according to claim 1, characterized in that: The base structure (1) includes a base body (101), and the base body (101) has bottom grooves (102) symmetrically machined on both sides for sliding cooperation with the bottom of the scissor lift mechanism (3). The lifting seat (9) has symmetrically machined top grooves (901) on both sides for sliding fit with the top of the scissor lift mechanism (3).

3. The automatic turning equipment for a hydropower station generator rotor according to claim 2, characterized in that: The scissor lift mechanism (3) includes a first scissor bar (302) and a second scissor bar (303) that are hinged together in the middle. The bottom end of the first scissor bar (302) is fixedly connected to the first crossbar (203), and the bottom end of the second scissor bar (303) is fixedly connected to the second crossbar (205). The two ends of the first crossbar (203) and the second crossbar (205) are respectively slidably engaged with the bottom slide groove (102) through the corresponding bottom slider (301). The top ends of the first scissor bar (302) and the second scissor bar (303) are slidably engaged with the top slide groove (901) through the corresponding slide bar and the top slider (304).

4. The automatic turning equipment for a hydropower station generator rotor according to claim 3, characterized in that: The lifting power device (2) includes a double-ended screw (207) rotatably mounted between the base body (101) via bearings. The two ends of the double-ended screw (207) are machined with reverse threads and form a threaded transmission engagement with the first nut seat (204) and the second nut seat (206) respectively. The first nut seat (204) is installed in the middle part of the first crossbar (203), and the second nut seat (206) is installed in the middle part of the second crossbar (205). The end of the double-ended screw (207) is connected to the main shaft of the first reducer (202) fixed on the base body (101). The first reducer (202) is connected to the first motor (201).

5. The automatic turning equipment for a generator rotor in a hydropower station according to claim 1, characterized in that: An electrical control cabinet (4) is fixed on one side of the top of the base structure (1); the electrical control cabinet (4) is connected to the scissor lift mechanism (3) and the lifting power device (2) and controls the corresponding actions.

6. The automatic turning equipment for a generator rotor in a hydropower station according to claim 1, characterized in that: Brush plates (5) are fixed on the top of the base structure (1) and on both sides of the disc wheel assembly (7), and brushes (6) are fixed on the top of the brush plates (5).

7. The automatic turning equipment for a generator rotor in a hydropower station according to claim 1, characterized in that: The disc wheel assembly (7) includes two sets of symmetrically fixed bearings (703) on the top of the lifting seat (9). A first wheel axle (702) is rotatably mounted between the bearings (703) of one set and a second wheel axle (705) is rotatably mounted between the bearings (703) of the other set. A pair of first friction wheels (701) are fixedly mounted on the first wheel axle (702) and a pair of second friction wheels (704) are fixedly mounted on the second wheel axle (705).

8. The automatic turning equipment for a hydropower station generator rotor according to claim 7, characterized in that: The turning gear power unit adopts a synchronous belt drive (8) or a synchronous chain drive (14).

9. An automatic turning gear for a hydropower station generator rotor according to claim 8, characterized in that: The synchronous belt drive device (8) includes a second reducer (802) connected to the first wheel shaft (702), the second reducer (802) being connected to the second motor (801), a first pulley (803) being fixed in the middle of the first wheel shaft (702), the first pulley (803) being connected to the second pulley (805) via a belt (804), and the second pulley (805) being fixed on the second wheel shaft (705).

10. An automatic turning gear for a hydropower station generator rotor according to claim 8, characterized in that: The synchronous chain drive device (14) includes an intermediate shaft (1405) rotatably mounted on the top middle part of the lifting seat (9). The intermediate shaft (1405) is connected to the output shaft of the third reducer (1402). The input shaft of the third reducer (1402) is connected to the output shaft of the third motor (1401). The intermediate shaft (1405) is meshed with the first wheel axle (702) through the first synchronous chain mechanism (1403). The intermediate shaft (1405) is meshed with the second wheel axle (705) through the second synchronous chain mechanism (1404).

11. The automatic turning equipment for a generator rotor in a hydropower station according to claim 1, characterized in that: The bottom of the base structure (1) is fitted with a modular support leg structure (15); the modular support leg structure (15) includes a U-shaped seat (1501) fixed to the bottom of the base structure (1), a modular support leg (1502) is hinged to the bottom of the U-shaped seat (1501), a modular base frame (1504) is hinged to the bottom of the modular support leg (1502), and fastening clamps (1503) are installed at the four corners of the modular base frame (1504).

12. A turning method using the automatic turning equipment for a hydropower station generator rotor as described in any one of claims 1-11, characterized in that, Includes the following steps: Step 1, Equipment transfer: The disassembled automatic turning equipment parts are manually transported to the working position inside the generator rotor wind tunnel. The scissor lift mechanism (3) is retracted to the lowest height, and each part is transported separately. Step 2, on-site assembly: On-site, the base structure (1) is assembled in sequence, the base structure (1) is fixed on the frame support leg (12), and two automatic turning equipment are arranged opposite each other to ensure symmetrical distribution; Step 3, lifting of the scissor lift assembly (7): Operate the scissor lift mechanism (3) to raise the scissor lift assembly (7) to press against the lower edge of the rotor (10) to ensure sufficient contact pressure. The two automatic scissor lift equipment are raised synchronously to ensure uniform force. Step 4, Rotor (10) rotation: Start the synchronous belt drive device (8), the opposing rotating wheel assembly (7) rotates synchronously, and the rotor (10) is driven to rotate by friction. The rotation angle is precisely controlled by the control cabinet to achieve precise positioning of the rotor, and then the equipment to be repaired is rotated to the designated position.

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