A special tool and method for disassembling a fan wheel

Abstract

The application relates to the technical field of ship turbine maintenance tools and mechanical equipment dismounting, and discloses a special dismounting tool and method for a fan impeller, which comprises multiple split top pushing units; the split top pushing unit comprises a top pushing screw rod and a supporting sleeve; the inside of the supporting sleeve is provided with an internal thread, one end of the top pushing screw rod is matched with the internal thread of the supporting sleeve and is arranged in the inside of the supporting sleeve, and the other end of the top pushing screw rod extends out of the supporting sleeve; the end of the top pushing screw rod extending out of the supporting sleeve is used for abutting against a fan motor, and the end face of the supporting sleeve away from the extending end of the top pushing screw rod abuts against the back surface of the fan impeller; synchronous top pushing of the split units can ensure that the impeller is uniformly stressed and prevents the impeller from being skewed and stuck; the overall structure is simple and light, and the tool is convenient to dismount, transport and replace; the tool provides a reliable foundation carrier for sequentially replacing different length screw rods for step-by-step ejection, and solves the problems of the traditional impeller dismounting tool, such as being heavy, poor space adaptation, uneven stress and easy damage to workpieces from the overall structure level.

Description

Technical Field

[0001] This invention relates to the field of marine engine maintenance tools and mechanical equipment disassembly technology, specifically to a special disassembly tool and method for a wind turbine impeller. Background Technology

[0002] In ship engine room ventilation systems, large axial flow fans (such as the CZF-140A type) are key equipment for ensuring air circulation in the engine room. According to ship operation and maintenance specifications, the fan motor bearings need to be replaced regularly. However, in actual maintenance work, disassembling the impeller of such large fans presents significant technical challenges and safety hazards.

[0003] For door-opening fans, it is usually necessary to first open the movable casing of the fan duct, then disassemble the impeller, and finally lift out the motor. Because the impeller diameter is large (e.g., 140cm) and it is located inside the fan duct, the operating space is extremely narrow. The commonly used impeller pullers on the market usually rely on the mounting screw holes on the impeller for pulling.

[0004] The existing disassembly screw holes on the impellers are too small in diameter to accommodate the screws of large-tonnage pullers. If a small screw is forcibly used, its tensile strength is insufficient to overcome the interference fit between the impeller and the shaft, as well as corrosion resistance, making it impossible to push the impeller out. Forcibly pulling with a small screw can easily lead to screw breakage or stripping of the screw threads, causing impeller damage and even safety accidents. The impeller is located inside the wind tunnel, in a confined space, making it difficult to deploy large pullers and providing sufficient leverage. Using single-point or two-point pulling can result in uneven force, easily leading to impeller deformation, shaft bending, or damage to the wind tunnel structure. Due to the lack of specialized tools, crew members often have to try various non-standard methods (such as hammering and heating), which is time-consuming, labor-intensive, and makes it difficult to guarantee the quality of disassembly.

[0005] In summary, the impeller design did not fully consider the ease of disassembly for later maintenance, and the screw hole size did not match the required disassembly force; the internal space of the air duct limited the use of large tools, so miniaturized and highly adaptable tools had to be used; and how to evenly transfer the axial disassembly force to the back of the impeller without damaging it, when the screw hole could not provide sufficient pulling force, was a key technical challenge. Summary of the Invention

[0006] This invention provides a special disassembly tool and method for wind turbine impellers, aiming to at least solve the technical problems of poor space adaptability, insufficient single ejection stroke, easy scratching of impellers, and uneven force during ejection of existing impeller disassembly fixtures, so as to achieve a split arrangement, staged ejection, and safe and non-destructive disassembly of the impeller.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a special disassembly tool for a wind turbine impeller, comprising a split-type jacking unit; the split-type jacking unit is provided in multiple sets, each set of split-type jacking units including a jacking screw and a support sleeve; the support sleeve has an internal thread, one end of the jacking screw engages with the internal thread of the support sleeve and passes through the inside of the support sleeve, and the other end of the jacking screw extends out of the support sleeve; the end of the jacking screw extending out of the support sleeve is used to abut against the wind turbine motor, and the end face of the support sleeve away from the end of the jacking screw abuts against the back of the wind turbine impeller.

[0008] Those skilled in the art will understand that the frameless, modular structure allows for flexible arrangement according to the available space at the wind turbine site, avoiding interference issues associated with traditional integrated tooling. The threaded telescopic structure provides smooth transmission, relying on the motor itself to bear the jacking reaction force without the need for auxiliary support components, simplifying disassembly and tooling. The synchronous jacking of multiple modular units ensures uniform force distribution on the impeller, preventing impeller skew and jamming. The overall structure is simple and lightweight, facilitating disassembly, assembly, and transportation. It provides a reliable foundation for subsequent phased replacement of screws of different lengths for step-by-step jacking, solving the problems of bulky, poorly adaptable, and easily damaged workpieces caused by uneven force distribution in traditional impeller disassembly tooling from an overall structural perspective.

[0009] In some embodiments, the special disassembly tool for the wind turbine impeller also includes a flat plate bearing member, which is fixedly installed on the side of the support sleeve away from the protruding end of the jacking screw.

[0010] In some embodiments, the cross-sectional area of ​​the flat plate bearing member is larger than that of the support sleeve to increase the contact bearing area with the impeller.

[0011] In some embodiments, the dedicated disassembly tool for the wind turbine impeller also includes a removable buffer pad, which is adapted to fit against the contact end face of the flat plate-type pressure-bearing member facing the impeller.

[0012] In some embodiments, the end of the push screw away from the support sleeve is provided with a multi-faceted rotating head for use with a wrench to tighten.

[0013] In some embodiments, there are at least three sets of split-type jacking units, and each set of split-type jacking units is evenly arranged along the circumference of the impeller hub.

[0014] In some embodiments, a limiting nut is provided on the outer wall of the push screw. The limiting nut is installed on the end face of the support sleeve near the protruding end of the push screw to limit the length of the push screw extending into the support sleeve.

[0015] In some embodiments, the split-type jacking unit has a minimum axial dimension, which is smaller than the axial assembly gap between the fan impeller and the fan motor. The split-type jacking unit can extend into the axial assembly gap between the fan impeller and the fan motor to complete the pre-assembly arrangement.

[0016] This invention also provides a method for disassembling a wind turbine impeller, using a special disassembly tool, including the following steps: Clean the hub contact area on the back of the fan impeller; take at least three sets of separate jacking units and arrange them evenly along the circumference of the impeller hub. Assemble the first length of the jacking screw into the support sleeve, so that the protruding end of the jacking screw abuts against the fan motor and the end of the support sleeve is in contact with the back of the fan impeller.

[0017] Simultaneously tighten the first length of the jacking screw to apply an initial jacking force to the back of the fan impeller. Observe the fit clearance between the fan impeller and the main shaft of the fan motor to determine whether the fan impeller is loose.

[0018] When the fan impeller is pushed out a set distance and the first-length push screw reaches its maximum extension stroke, install the second-length push screw and support sleeve into place, so that the extended end of the second-length push screw abuts against the fan motor, and the end of the support sleeve that assembles the second-length push screw fits against the back of the fan impeller. At this time, loosen the first-length push screw in the opposite direction, remove the first-length push screw and the support sleeve assembled with the first-length push screw, and then simultaneously tighten the second-length push screw again to continue pushing the fan impeller outward.

[0019] When the impeller is pushed outwards further until the stroke of the second-length push screw is exhausted, install the third-length push screw and support sleeve into place, so that the extended end of the third-length push screw abuts against the fan motor, and the end of the support sleeve that assembles the third-length push screw fits against the back of the fan impeller. At this time, loosen the second-length push screw in the opposite direction, remove the second-length push screw and the support sleeve assembled with the second-length push screw, and continue to feed the third-length push screw synchronously again until the impeller is completely separated from the main shaft of the fan motor.

[0020] After the wind turbine impeller is completely detached, loosen the third length of the jacking screw in the opposite direction and remove all the separate jacking units to complete the disassembly operation.

[0021] In some embodiments, the first length is less than the second length, and the second length is less than the third length. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1This is a schematic diagram of the structure of the special disassembly tool in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the special disassembly tool in operation according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures: 1. Split-type jacking unit; 2. Jacking screw; 3. Support sleeve; 4. Fan motor; 5. Fan impeller; 6. Flat plate type pressure bearing component; 7. Removable buffer pad; 8. Multi-faceted rotating head; 9. Limit nut. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that in the description of this invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0029] like Figure 1 and Figure 2 As shown, this embodiment provides a special disassembly tool for a wind turbine impeller, including: a split-type jacking unit 1; the split-type jacking unit 1 is provided in multiple sets, each set of split-type jacking units 1 includes a jacking screw 2 and a support sleeve 3; the support sleeve 3 has an internal thread, one end of the jacking screw 2 is engaged with the internal thread of the support sleeve 3 and passes through the inside of the support sleeve 3, and the other end of the jacking screw 2 extends out of the support sleeve 3; the end of the jacking screw 2 extending out of the support sleeve 3 is used to abut against the wind turbine motor 4, and the end face of the support sleeve 3 away from the end of the jacking screw 2 abuts against the back of the wind turbine impeller 5.

[0030] The device adopts a split-type jacking unit 1 structure, abandoning the traditional integrated frame-type puller tooling. It has a simple structure, small size, and flexible layout, and can be adapted to the narrow working space of the fan without structural interference. The adjustable telescopic jacking is achieved by the threaded engagement of the jacking screw 2 and the support sleeve 3. With the motor as the fixed fulcrum, it pushes the back of the impeller in the opposite direction. Relying on the equipment body to bear the reaction force, no additional auxiliary support tooling is required. The jacking is stable and safe, fundamentally solving the defects of traditional integrated tooling such as bulkiness, poor space adaptability, and limited installation.

[0031] Preferably, the support sleeve 3 is made of iron pipe with an outer diameter of 26 mm, a wall thickness of 2.5 mm, and a length of 18 cm.

[0032] It should be noted that in this embodiment, the split-type push unit 1 is a basic structure consisting of a push screw 2 and a support sleeve 3 threadedly engaged, which pushes the fan impeller 5 in the opposite direction with the motor as the fulcrum. Any modification scheme that simply changes the outer diameter of the screw or the wall thickness of the sleeve without departing from the core structure of the split-type threaded telescopic push unit is within the protection scope of this embodiment.

[0033] In this embodiment, the special disassembly tool for the wind turbine impeller also includes a flat plate-type pressure-bearing component 6, which is fixedly installed on the side of the support sleeve 3 away from the protruding end of the jacking screw.

[0034] A flat plate-type pressure-bearing component 6 is added to the end of the support sleeve 3 to change the traditional point-like and line-like contact form of the sleeve end face and form a special pressure-bearing contact surface. This avoids the support sleeve 3 directly and rigidly pressing the impeller, prevents stress concentration on the sleeve end face from damaging the impeller, and improves the protection and structural stability of the impeller during disassembly.

[0035] Preferably, the cross-sectional area of ​​the flat plate-type pressure-bearing component 6 is larger than that of the support sleeve 3, so as to increase the contact bearing area with the fan impeller 5, effectively expand the contact bearing area of ​​the impeller, significantly reduce the local pressure on the impeller surface, avoid local pressure deformation and pit damage of the impeller hub, and adapt to the non-destructive disassembly requirements of thin-walled and painted impellers.

[0036] More preferably, the flat plate type pressure bearing component 6 is made of flat iron with a width of 50 mm and a length of 120 mm. It is welded to the support sleeve 3, which increases the contact area with the back of the fan impeller 5, reduces the pressure per unit area, and effectively prevents the top rod from damaging the surface of the fan impeller 5 or causing local plastic deformation.

[0037] It should be noted that different fixing methods such as welding, bolting, and integral molding of the flat plate pressure bearing component 6 and the support sleeve 3, as well as the widening of the flat plate pressure bearing component 6 to adapt to the impeller specifications without changing the core design of widening the pressure bearing, all fall within the scope of equivalent protection of this embodiment.

[0038] In this embodiment, a special disassembly tool for a fan impeller also includes a removable buffer pad 7, which is attached to the contact end face of the flat plate-type pressure-bearing member 6 facing the fan impeller 5.

[0039] A removable buffer pad 7 is added between the flat plate type pressure bearing component 6 and the fan impeller 5 to achieve flexible isolation between the rigid jacking structure and the impeller surface, avoid metal-to-metal contact that causes scratches and bumps, further ensure the impeller's appearance and coating are intact, and achieve non-destructive disassembly.

[0040] Preferably, the removable buffer pad 7 is a removable rubber pad.

[0041] The removable buffer pad 7 is made of rubber, which has good elasticity and cushioning effect, is wear-resistant and easy to install and remove. It can effectively absorb the slight vibration and hard contact stress during the jacking process, and has stable protective performance. At the same time, it can be adapted to flat plate-type pressure-bearing parts 6 with different outer diameters, and has strong versatility.

[0042] It should be noted that in this embodiment, a detachable buffer pad 7 is added between the flat plate pressure-bearing component 6 and the fan impeller 5. The flat plate pressure-bearing component 6 adopts different detachable installation forms such as snap-fit, sleeve, and flat laying, and uses the same type of elastic buffer material such as polyurethane and silicone to replace the rubber pad. These are equivalent replacements and all fall within the protection scope of this embodiment.

[0043] In this embodiment, as Figure 1 As shown, the end of the push screw 2 that extends out of the support sleeve 3 is provided with a multi-faceted rotating head 8 for use in screwing.

[0044] The push screw 2 is provided with a multi-faceted rotating head 8 at its end, which can be directly used with a standard wrench for tightening operations without the need for special tools. This makes operation labor-saving, easy to disassemble and assemble, and improves the efficiency of on-site disassembly operations. It is compatible with general tools in industrial sites. Multi-faceted rotating heads 8 with different numbers of edges, such as hexagonal and octagonal, are all within the protection scope of this embodiment.

[0045] In this embodiment, as Figure 2 As shown, there are at least three sets of split-type pusher units 1, and each set of split-type pusher units 1 is evenly arranged along the circumference of the impeller hub.

[0046] The structure employs at least three separate jacking units 1 evenly arranged along the circumference of the hub, which can generate multi-point symmetrical and uniform synchronous jacking force on the impeller, avoid impeller unilateral deviation and uneven force, effectively prevent impeller jamming and tilting that could jam the main shaft, and ensure a smooth and stable disassembly process.

[0047] Schemes involving four, five, or more groups of evenly arranged split-type jacking units 1 also fall within the protection scope of this embodiment.

[0048] In this embodiment, as Figure 1As shown, a limit nut 9 is provided at one end of the support sleeve 3 near the protruding end of the push screw 2 to limit the length of the push screw 2 extending into the support sleeve 3.

[0049] The addition of a limit nut 9, a stroke limiting structure, primarily serves to prevent disengagement and limit movement, rather than to adjust the stroke. During the twisting and extending / retracting of the push screw 2, it can lock and constrain the extreme screw-out position of the push screw 2, effectively preventing the push screw 2 from excessively screwing out of the support sleeve 3, which could lead to complete thread disengagement, screw detachment, or tooling disintegration and failure. This eliminates the safety hazards of parts falling off or sudden failure of the push force during operation, significantly improving the overall assembly stability and operational safety of the tooling.

[0050] In this embodiment, the split-type jacking unit 1 has a minimum axial dimension, which is smaller than the axial assembly gap between the fan impeller 5 and the fan motor 4. The split-type jacking unit 1 can extend into the axial assembly gap between the fan impeller 5 and the fan motor 4 to complete the pre-assembly arrangement.

[0051] The split-type jacking unit 1 has a minimum axial external dimension, which is adapted to the axial assembly gap between the fan impeller 5 and the fan motor 4. The split-type jacking unit 1 can directly extend into the assembly gap to complete the pre-assembly based on the minimum axial dimension. After assembly, the jacking screw 2 can be extended to realize the jacking operation, taking into account the needs of assembly in narrow spaces and disassembly with a large stroke in stages, and adapting to the limited working conditions inside the compact fan.

[0052] In this embodiment, multiple jacking screws 2 with different axial lengths are provided. Each jacking screw 2 can be interchangeably assembled into the support sleeve 3. The jacking screws 2 of different lengths are used in combination to realize the staged and progressive ejection of the fan impeller 5.

[0053] Equipped with multiple interchangeable lengths of push screw 2, it enables quick interchange and assembly based on a unified thread specification. Addressing the pain points of large impeller disassembly stroke and insufficient single thread stroke, it can achieve phased and progressive push-out without the need to repeatedly add shims. This solves the problems of insufficient push stroke, shim slippage, and cumbersome operation in traditional push-out systems, greatly improving disassembly adaptability and work efficiency.

[0054] The length of the push screw 2 can be modified according to the adaptability of the fan impeller 5. As long as the approach of using multi-specification interchangeable screws to push out sections is adopted, it will fall within the protection scope of this embodiment.

[0055] A method for disassembling a wind turbine impeller, using specialized disassembly tools, includes the following steps: Clean the hub contact area on the back of the fan impeller 5; take at least three sets of separate push units 1 and arrange them evenly along the circumference of the impeller hub, assemble the first length of push screw 2 into the support sleeve 3, so that the protruding end of the push screw 2 abuts against the fan motor 4, and the end of the support sleeve 3 is attached to the back of the fan impeller 5.

[0056] Simultaneously tighten the first length of the push screw 2 to apply an initial push force to the back of the fan impeller 5, observe the fit clearance between the fan impeller 5 and the main shaft of the fan motor 4, and determine whether the fan impeller 5 is loose.

[0057] When the fan impeller 5 is pushed out a set distance and the first-length push screw 2 reaches its maximum extension stroke, install the second-length push screw 2 and the support sleeve 3 into place, so that the extended end of the second-length push screw 2 abuts against the fan motor 4, and the end of the support sleeve 3 of the second-length push screw 2 is attached to the back of the fan impeller 5. At this time, loosen the first-length push screw 2 in the opposite direction, take out the first-length push screw 2 and the support sleeve 3 assembled with the first-length push screw 2, and then tighten the second-length push screw 2 again in sync to continue pushing the fan impeller 5 outward.

[0058] When the impeller 5 is pushed outwards until the stroke of the second-length push screw 2 is exhausted, the third-length push screw 2 and the support sleeve 3 are installed in place, so that the extended end of the third-length push screw 2 abuts against the fan motor 4, and the end of the support sleeve 3 of the third-length push screw 2 is attached to the back of the impeller 5. At this time, the second-length push screw 2 is loosened in the opposite direction, and the second-length push screw 2 and the support sleeve 3 assembled with the second-length push screw 2 are removed. The third-length push screw 2 is then continuously and synchronously fed again until the impeller is completely separated from the main shaft of the fan motor 4. Throughout the process, the extension length of each set of push screws 2 of the same length is kept basically consistent to avoid the impeller 5 being tilted on one side.

[0059] After the impeller 5 is completely detached, the third length of the jacking screw 2 is loosened by reverse rotation, and the entire split jacking unit 1 is removed to complete the disassembly operation.

[0060] Specifically, clean the hub contact area on the back of the fan impeller 5, and lay the removable buffer pad 7 on the surface of the flat plate bearing component 6; take at least three sets of separate push units 1 and arrange them evenly along the circumference of the impeller hub, assemble the first length of push screw into the support sleeve 3, so that the protruding end of the push screw 2 abuts against the fan motor 4, and the flat plate bearing component 6 at the end of the support sleeve 3 fits against the back of the fan impeller 5.

[0061] The multi-faceted rotating head 8 of the first set of three sets of first-length jacking screws 2 is simultaneously screwed to make the flat plate type bearing component 6 press against the back of the fan impeller 5 and apply an initial jacking force. The fit clearance between the impeller and the main shaft is observed to determine whether the impeller is loose.

[0062] When the fan impeller 5 is pushed out a certain distance and the first-length push screw 2 reaches its maximum extension stroke, the split push unit 1 of the second-length push screw 2 is used to press the extended end of the second-length push screw 2 against the fan motor 4. The end of the support sleeve 3 of the second-length push screw 2 is attached to the back of the fan impeller 5. At this time, the first-length push screw 2 is loosened in the opposite direction, the split push unit 1 of the first-length push screw 2 is taken out, and the second-length push screw 2 is tightened again in sync to continue pushing the fan impeller 5 outward.

[0063] When the impeller 5 is pushed outwards until the stroke of the second-length push screw 2 is exhausted, the split push unit 1 of the third-length push screw 2 is used to press the extended end of the third-length push screw 2 against the fan motor 4. The end of the support sleeve 3 of the third-length push screw 2 is attached to the back of the impeller 5. At this time, the second-length push screw 2 is loosened in the opposite direction, the split push unit 1 of the second-length push screw 2 is removed, and the third-length push screw 2 is continuously and synchronously fed again until the impeller is completely separated from the main shaft of the fan motor 4. Throughout the process, the extension length of each set of push screws 2 of the same length is kept basically consistent to avoid the impeller 5 being tilted on one side.

[0064] After the impeller is completely disengaged, the third-length jacking screw 2 is loosened by reverse rotation, and the entire split jacking unit 1 is removed to complete the disassembly operation.

[0065] In addition, if the pushing resistance is too high during the jacking process, heating assistance can be used, such as using a hot air gun to heat the impeller hub at a low temperature, controlling the heating temperature to be lower than the metal annealing temperature.

[0066] In this embodiment, the first length is less than the second length, and the second length is less than the third length.

[0067] Preferably, the specific process of disassembling the wind turbine impeller using a special disassembly tool is as follows: First, pre-disassembly preparation work is carried out to thoroughly clean the back of the impeller 5, the hub, and the contact surfaces of the flat plate bearing component 6, removing metal debris, rust, oil, and other foreign objects to prevent impurities from squeezing and scratching the impeller surface or affecting the pushing accuracy during disassembly. After cleaning, a removable rubber buffer pad is flatly and firmly laid on the contact end face of the flat plate bearing component 6 to achieve flexible isolation and protection between the impeller and the tooling.

[0068] Subsequently, the tooling is arranged and assembled. At least three sets of separate jacking units 1 are selected. Based on the impeller hub structure, each set of separate jacking units 1 is evenly and symmetrically arranged along the circumference of the impeller hub to ensure that the stress points of each tooling set are evenly distributed. An M20×90mm short jacking screw is installed inside the support sleeve. The position of the jacking screw 2 is adjusted so that the protruding end of the jacking screw 2 tightly abuts against the fan motor 4. At the same time, it is ensured that the flat plate-type pressure-bearing component 6 at the end of the support sleeve 3 is stably attached to the back of the fan impeller 5, thus completing the tooling positioning and arrangement.

[0069] After the tooling assembly is completed, the first stage of initial ejection operation is carried out. The multi-faceted rotating head 8 of the three sets of push screws 2 is turned synchronously and evenly with a wrench, so that the push screws 2 slowly extend relative to the support sleeve 3. Through the thread transmission, the support sleeve 3 applies a uniform and stable initial push force to the back of the impeller. The change in the fit clearance between the impeller and the main shaft is continuously observed to determine whether the impeller is loose. The turning rhythm of each set of push screws 2 is kept consistent throughout the process to avoid the impeller being deviated by force on one side.

[0070] When the impeller is uniformly pushed out 2-3cm, and the M20×90mm jacking screw 2 reaches its maximum effective extension stroke and can no longer push, the second stage of extended jacking operation begins. Simultaneously and evenly loosen all jacking screws 2 in the opposite direction to eliminate the preload on one side of the impeller. After the tooling is unloaded, remove the short-sized jacking screw 2 from the support sleeve 3 and replace it with a medium-sized M20×120mm jacking screw 2. After assembly, tighten each set of jacking screws 2 simultaneously again to continue jacking the impeller step by step, thus continuing the impeller disengagement process.

[0071] Once the stroke of the medium-sized push screw 2 is exhausted and the impeller is pushed outwards further, the third stage of complete separation begins. The load is then simultaneously unloaded and the M20×120mm push screw 2 is disassembled and replaced with an M20×150mm long push screw 2. Each set of push screws 2 is fed synchronously and at a constant speed. The extension length of the three sets of push screws 2 is strictly controlled throughout the process to ensure that the extension is basically consistent, preventing the impeller from tilting to one side or jamming the main shaft. The push continues until the impeller is completely separated from the main shaft journal of the fan motor 4.

[0072] After the impeller is completely disassembled and separated, each set of jacking screws 2 is loosened in reverse order to gradually release the jacking force of the tooling. Then, all the separate jacking units 1 are removed one by one, the tooling is organized and stored, and the overall non-destructive disassembly of the fan impeller 5 is completed.

[0073] In summary, the present invention achieves the following beneficial effects: 1) The present invention adopts a split jacking unit 1 structure without an overall connecting frame, which is flexible and lightweight and can be adapted to the narrow working space of the fan. It will not interfere with the equipment shell and pipeline. Relying on the threaded expansion and contraction of the jacking screw 2 and the support sleeve 3, the fan motor 4 shell is used as the force fulcrum to push the fan impeller 5 in the opposite direction. The equipment body bears the jacking reaction force. No additional auxiliary support tooling is required. A single person can complete the disassembly operation, which is more applicable to a wider range of scenarios.

[0074] 2) By setting a widened flat plate-type pressure-bearing component 6 at the end of the support sleeve 3, the contact bearing area with the fan impeller 5 is greatly increased, the local pressure on the surface of the fan impeller 5 is reduced, and stress concentration at the end face of the sleeve is avoided, which causes indentation and deformation of the fan impeller 5. Combined with a detachable rubber buffer pad to form a flexible isolation, the hard metal contact is prevented from scratching the impeller coating and substrate, and the impeller can be disassembled without damage.

[0075] 3) The end of the push screw 2 is equipped with a multi-faceted rotating head 8, which can be directly used with a general-purpose wrench on site. No special tools are required, making disassembly and assembly easier and improving on-site work efficiency. The push screw 2 is equipped with a limit nut 9, which can limit the maximum screwing distance of the push screw 2, prevent the thread from completely disengaging from the sleeve, causing the screw to fall off and the tooling to fail, and eliminate the safety hazards of operation.

[0076] 4) Configure at least three separate push units 1 and arrange them evenly along the circumference of the hub. During disassembly, a uniform axial push force can be applied simultaneously to effectively avoid the impeller tilting on one side and jamming the main shaft. The disassembly process is smooth and stable. It is equipped with multiple interchangeable push screws 2 of different lengths, which can push out the impeller in stages and step by step, eliminating the tedious steps of repeatedly adding pads in traditional disassembly. There will be no problem of pad slippage and loss of force, which greatly simplifies the operation process.

[0077] 5) This invention is equipped with a standardized disassembly process for replacing screws in three stages, which gradually disengages the impeller and controls the extension stroke of each screw synchronously throughout the process. The force is balanced and controllable, eliminating the need for violent disassembly. The overall tooling structure is simple with few parts, and it is easy to store and transport after disassembly. It takes into account practicality, safety and versatility, and effectively solves many defects of existing integrated puller tooling such as bulkiness, poor space adaptability, easy damage to the impeller and cumbersome operation.

[0078] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A special disassembly tool for a wind turbine impeller, characterized in that, include: Split-type jacking unit (1); The split-type jacking unit (1) is provided in multiple sets, and each set of the split-type jacking unit (1) includes a jacking screw (2) and a support sleeve (3). The support sleeve (3) has an internal thread inside. One end of the push screw (2) is engaged with the internal thread of the support sleeve (3) and passes through the inside of the support sleeve (3). The other end of the push screw (2) extends out from the support sleeve (3). The end of the push screw (2) extending out of the support sleeve (3) is used to abut against the fan motor (4), and the end face of the support sleeve (3) away from the end of the push screw (2) abuts against the back of the fan impeller (5).

2. The special disassembly tool according to claim 1, characterized in that, It also includes a flat plate type pressure bearing member (6), which is fixedly installed on the side of the support sleeve (3) away from the protruding end of the push screw (2).

3. The special disassembly tool according to claim 2, characterized in that, The cross-sectional area of ​​the flat plate bearing member (6) is larger than that of the support sleeve (3) to increase the contact bearing area with the fan impeller (5).

4. The special disassembly tool according to claim 2, characterized in that, It also includes a removable buffer pad (7) that is attached to the end face of the flat plate bearing member (6) facing the fan impeller (5).

5. The special disassembly tool according to claim 1, characterized in that, The push screw (2) has a multi-faceted rotating head (8) at one end extending out of the support sleeve (3) for screwing.

6. The special disassembly tool according to claim 1, characterized in that, The split-type push unit (1) consists of at least three groups, and each group of split-type push units (1) is evenly arranged along the circumference of the impeller hub.

7. The special disassembly tool according to claim 1, characterized in that, A limit nut (9) is provided at one end of the support sleeve (3) near the protruding end of the push screw (2) to limit the length of the push screw (2) extending into the support sleeve (3).

8. The special disassembly tool according to claim 1, characterized in that, The split-type push unit (1) has a minimum axial dimension, which is smaller than the axial assembly gap between the fan impeller (5) and the fan motor (4). The split-type push unit (1) can extend into the axial assembly gap between the fan impeller (5) and the fan motor (4) to complete the pre-assembly arrangement.

9. A method for disassembling a fan impeller, characterized in that, The disassembly tool for a wind turbine impeller as described in any one of claims 1 to 8 includes the following steps: Clean the hub contact area on the back of the impeller (5); take at least three sets of separate push units (1) and arrange them evenly along the circumference of the impeller hub. Assemble the first length of push screw (2) in the support sleeve (3) so that the protruding end of the push screw (2) abuts against the fan motor (4) and the end of the support sleeve (3) fits against the back of the impeller (5); Simultaneously tighten the first length of the push screw (2) to apply an initial push force to the back of the fan impeller (5), observe the fit clearance between the fan impeller (5) and the main shaft of the fan motor (4), and determine whether the fan impeller (5) is loose; When the impeller (5) is pushed out a set distance and the first length push screw (2) reaches its maximum extension stroke, install the second length push screw (2) and the support sleeve (3) into place, so that the extended end of the second length push screw (2) abuts against the fan motor (4), and the end of the support sleeve (3) that assembles the second length push screw (2) fits against the back of the impeller (5). At this time, loosen the first length push screw (2) in the opposite direction, take out the first length push screw (2) and the support sleeve (3) assembled with the first length push screw (2), and tighten the second length push screw (2) again in sync to continue pushing the impeller (5) outward. When the impeller (5) is pushed outward further until the stroke of the second length push screw (2) is exhausted, install the third length push screw (2) and the support sleeve (3) in place, so that the extended end of the third length push screw (2) abuts against the fan motor (4), and the end of the support sleeve (3) that assembles the third length push screw (2) is attached to the back of the impeller (5). At this time, loosen the second length push screw (2) in the opposite direction, take out the second length push screw (2) and the support sleeve (3) assembled with the second length push screw (2), and continue to feed the third length push screw (2) synchronously again until the impeller is completely separated from the main shaft of the fan motor (4); After the impeller (5) is completely detached, the third length of the push screw (2) is loosened in the opposite direction, and the entire split push unit (1) is removed to complete the disassembly operation.

10. The method for disassembling a wind turbine impeller according to claim 9, characterized in that, The first length is less than the second length, and the second length is less than the third length.

Images