CN113931802A - High-altitude fan blade replacement method based on cooperation of double cranes - Google Patents
High-altitude fan blade replacement method based on cooperation of double cranes Download PDFInfo
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- CN113931802A CN113931802A CN202111120148.5A CN202111120148A CN113931802A CN 113931802 A CN113931802 A CN 113931802A CN 202111120148 A CN202111120148 A CN 202111120148A CN 113931802 A CN113931802 A CN 113931802A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/30—Commissioning, e.g. inspection, testing or final adjustment before releasing for production
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/40—Arrangements or methods specially adapted for transporting wind motor components
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
A high-altitude fan blade replacing method based on double-crane cooperation comprises the following steps: 1) preparing for disassembly and assembly; 2) positioning a double crane; 3) yaw locking and turning; 4) transferring and transporting the material machines in the ground and air; 5) installing a high-altitude hoisting belt and a cable rope; 6) the double machines cooperatively separate the falling blade; 7) the double machines cooperate, 3-direction adjustment is in place and positioned; 8) the double-machine cooperates with the part to be reported of the new blade to penetrate and fasten; 9) unlocking and testing operation and checking acceptance. According to the method, the blades form a horizontal balance state in the high altitude through the double cranes, the lifting adjustment is convenient, the angle swing angle can be finely adjusted through the guy cable, and the method has the characteristics of low operation difficulty and high efficiency.
Description
Technical Field
The invention relates to the technical field of replacement of blades of electric fans, in particular to a method for replacing blades of a high-altitude fan based on cooperation of double cranes.
Background
The fan blade is easy to be damaged by lightning stroke, blade bolt fatigue and other reasons in field operation, and needs to be disassembled and replaced in the air under the condition of heavy damage.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method for replacing the blades of the high-altitude fan based on cooperation of double cranes.
For the purpose, the invention adopts the technical scheme that: a high-altitude fan blade replacing method based on double-crane cooperation is characterized by comprising the following steps:
1) disassembling and assembling preparation: preparing roads and hoisting sites, evaluating weather conditions of construction, preparing hoisting equipment and machines and tools, and preparing operating personnel;
2) the double cranes are in place: adopting a double crane, wherein the double crane comprises a main crane and an auxiliary crane, and the main crane and the auxiliary crane are respectively positioned at two sides of a blade projection line to be replaced, wherein the lifting point of the main crane is positioned at the root part of the blade, and the lifting point of the auxiliary crane is positioned at the middle section of the blade;
3) yaw locking and barring: yawing the fan to a dismounting space, locking the yawing, turning the operating blades to be in a horizontal state, electrically braking, locking a mechanical locking pin, and reinforcing the main shaft by using a manual hoist to prevent rotation;
4) material machine ground air transportation: hoisting the machine tool materials and the operating personnel to the top of the fan cabin by a main crane by adopting a hanging basket, putting down the hanging basket as a transfer station, and manually unloading the machine tool materials and transferring the machine tool materials to the fan cabin;
5) installing a high-altitude hoisting belt and a cable rope: the method comprises the following steps that an operator stands on a hanging basket lifted by a main crane to perform high-altitude hoisting belt binding operation, the hanging basket is lifted to the middle section of a blade to bind a hoisting belt at the middle section of the blade, a cable wind guide rope is installed on the hoisting belt at the middle section, the rope end of the cable wind guide rope is lowered to the ground, a lifting hook of an auxiliary crane is close to the hanging basket, the middle section hoisting belt is tied by the operator in the hanging basket to be hung in a lifting hook of the auxiliary crane, then the hanging basket is conveyed to the root of the blade to bind the hoisting belt at the root of the blade, then the operator and the root hoisting belt are lifted to the top of a fan cabin, the hanging basket is put down, and then the root hoisting belt is tied in the lifting hook of the main crane;
6) and (3) separating and falling the blade by double-machine cooperation: after the main crane and the auxiliary crane lift the lifting hooks to exert force, loosening the connecting bolts of the paddles and the impellers, linking and cooperatively releasing the paddles by the main crane and the auxiliary crane, and placing the replaced paddles under the formulated ground by the aid of the cable rope in the modes of cooperative rotation, raking rods and retracting hooks;
7) double-machine cooperation, 3-direction adjustment in position and positioning: the new blade is transported to an operation site through a lifting vehicle, then the binding of a middle section hoisting belt and the binding of a root hoisting belt of the new blade are carried out, a cable wind guide rope is installed on the middle section hoisting belt, the middle section hoisting belt and the root hoisting belt are respectively tied and hung on an auxiliary crane and a main crane, then the new blade is lifted and hung to the ground from the lifting vehicle through the cooperation of the main crane and the auxiliary crane, after a screw rod is installed, the new blade is hoisted to an impeller installation hole, the new blade is adjusted to be in a horizontal state through the main crane, the auxiliary crane and the cable wind rope, then the root of the new blade is aligned with the installation hole and gradually approaches to the installation hole, so that the root of the new blade is butted into the installation hole, and the positioning work is completed;
8) the double-machine cooperated with the new paddle part to be reported penetrates and is fastened: after the new blade is positioned, slowly inserting a bolt rod of the new blade into a corresponding bolt hole of the impeller, installing and fastening a bolt, and finally disassembling a hoisting belt and a cable rope;
9) unlocking, test run detection and acceptance: and releasing the locking device, recovering the power generation state of the fan, and performing test operation detection and acceptance when the wind speed reaches the operation wind speed.
As a further improvement of the invention, in the step 1), the road needs to be subjected to traffic exploration, the road surface is trimmed, blocked tree branches and leaves are cut down, and pipelines are changed when necessary; arranging a hoisting field according to the positions of the double cranes, so that the gradient of the hoisting field is less than or equal to 1 percent, the compactness is more than or equal to 90 percent, and the plane elevation of the field is the same as the road surface elevation; comprehensive evaluation needs to be carried out on the lowest wind speed, the highest wind speed and the rain and fog weather of the site for 7 days in the future, and the construction day meeting the requirements is selected.
As a further improvement of the invention, in the step 1), the machine material comprises a hoisting belt, a blade protecting sleeve and a hoisting belt retracting hook; the operating personnel comprises 1 commander, 2 crane drivers, 3 persons for releasing and fastening bolts in the cabin, 2 persons for installing or removing lifting belt persons in the air, and the personnel in the wind power plant need to carry out safety technology communication and perform monitoring before the operation of the operating personnel.
As a further improvement of the invention, in the step 2), the main crane and the auxiliary crane are separated and staggered under the blade projection line, and are positioned on a parallel road, wherein the main crane is positioned by adopting normal running, and the auxiliary crane is positioned by adopting a retreating type.
As a further improvement of the invention, in the step 5), a blade protective sleeve is firstly installed at the installation position of a lifting belt of the blade, and then the lifting belt is bound; when the middle section hoisting belt and the root hoisting belt are bound, the hanging basket is lifted to the upper side of the blade, then the hoisting belt is put down in half across the blade, then the hanging basket is transferred to the lower side of the blade, the hoisting belt is collected by the retractable hook and is alternately bound by the double-turn chokes.
As a further improvement of the present invention, in step 7), if the operation is performed at night, a commander in the impeller hub needs to command the butt joint of the new blades through an interphone and a highlight flashlight.
As a further improvement of the invention, in step 8), after the new blade is positioned, the position of the new blade is finely adjusted through the operation of the guy cable and the main and auxiliary cranes; after the bolt rod is inserted into the corresponding bolt hole of the impeller, the bolts are symmetrically and manually installed by adopting a turning method; the fastening bolt is fastened by a hydraulic torque wrench.
As a further improvement of the invention, in step 8), an operator needs to confirm whether the installation accuracy is met according to the zero position on the impeller and the zero mark line of the new blade, and when the zero degree is misplaced and the bolt and the hole position have deviation, the bolt hole is aligned to the blade bolt on the impeller side barring, the zero position in the impeller is adjusted and corrected after the bolt is fastened, and background parameters of the fan are reset, so that the consistency of the aerial postures of the three blades of the fan is ensured.
As a further improvement of the invention, in the step 9), after the bolts are fastened and the yard is cleared completely, the operator needs to check the electrical connection circuit of the pitch system, and then the locking device is released to recover the power generation state of the fan; during the trial operation, the wind generating set needs to be comprehensively and safely tested in an emergency feathering mode, whether the three impellers are unbalanced in stress or not is judged through watching, listening and body perception, so that the set generates a resonance fault, and meanwhile, the conformance of the set before and after the vibration curve is disassembled is contrastingly analyzed through a background monitoring system of the fan.
The invention has the beneficial effects that:
(1) a set of fan blade replacement process with a standard and effective process is formed. No matter how the time is, the single blade of the high-altitude fan can be detached and replaced within 6.0 hours as long as the wind speed is less than 8m/s, continuous operation in the day and at night is realized by a double-machine lifting method and a cable rope positioning method, and the method is simple and efficient.
(2) Ground-to-air transportation and transfer. A transfer station is arranged at the top of the fan cabin, and machines, materials and personnel are quickly transferred through a hanging basket, so that the manual transportation and transmission of large-size machine equipment through a tower barrel part are avoided, and the working speed is improved; meanwhile, the aerial lifting hook conversion of the hanging basket aerial lifting belt binding operation and the lifting operation is realized by utilizing the transfer station.
(3) Accurate needle threading alignment is realized by the double cranes and the guy cables. The method adopts a main crane and an auxiliary crane, hoisting points are respectively arranged at the middle section and the root of the blade, the blade is enabled to form a high-altitude horizontal balance state by utilizing a lifting principle, the hoisting point at the root is used as a hinge, and a door opening and closing effect is formed by using smaller force, so that the horizontal angle fine adjustment of the heavier blade can be completed by using smaller horizontal force, the steering, lifting and shifting of the blade in the air can be realized, the operation difficulty is low, in addition, the horizontal needle tip swing angle fine adjustment can be realized by pulling a cable wind rope on the ground, the auxiliary blade is accurately inserted in an orifice, and the needle threading function is realized.
(4) The popularization is strong. The invention can be applied to the land area wind turbine, and can also be applied to the installation and maintenance of the offshore wind power blade by selecting a proper crane and a proper operation platform.
Drawings
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1, a method for replacing blades of an overhead fan based on cooperation of two cranes comprises the following steps:
1) disassembling and assembling preparation: preparing roads and hoisting sites, wherein the roads need to be subjected to traffic investigation, the road surface is trimmed, blocked tree branches and leaves are cut down, and pipelines are moved and changed when necessary; and arranging the hoisting field according to the positions of the double cranes, so that the gradient of the hoisting field is less than or equal to 1 percent, the compactness is more than or equal to 90 percent, and the plane elevation of the field is the same as the pavement elevation of the road. And (4) carrying out weather condition evaluation on construction days, carrying out weather condition evaluation by combining the apple mobile phone APP software Windy with local weather forecast, carrying out comprehensive evaluation on the lowest wind speed, the highest wind speed and the rain and fog weather on the site for 7 days in the future, and selecting the construction days meeting the requirements. Hoisting equipment, implement material preparation and operator preparation are performed. The hoisting equipment comprises a main crane and an auxiliary crane. The machine material comprises a lifting belt, a blade protecting sleeve and a lifting belt retracting hook, a hydraulic station, a hydraulic wrench, a cabin-mounted lighting lamp, a ground spotlight (for night lighting), a hanging basket, an interphone and the like, wherein the night lighting adopts a ground spotlight idle-shooting mode, and the irradiation target center is the butt joint part of the root part of the blade and the lifting point 2. The operating personnel comprises 1 commander, 2 crane drivers, 3 persons for releasing and fastening bolts in the cabin, 2 persons for installing or removing lifting belt in the air and 2 persons for operating the operating personnel before operation. The personnel in the wind power plant need to carry out safety technology intersection and do monitoring work.
2) The double cranes are in place: as shown in fig. 2, the main crane and the auxiliary crane are separated and staggered at two sides below the blade projection line, and are in position parallel to the road, wherein the hoisting point of the main crane is located at the root of the blade, the main crane is in position by normal running, the hoisting point of the auxiliary crane is located at the middle section of the blade, and the auxiliary crane is in position by retreating from the vehicle.
3) Yaw locking and barring: the fan is drifted to the dismounting space, the yawing is locked, the operating paddle is turned to be in a horizontal state, the mechanical locking pin is locked by the electric brake, and the main shaft is reinforced by the hand-operated hoist to prevent rotation.
4) Material machine ground air transportation: the hanging basket is adopted to hoist the machine material and the operating personnel to the top of the fan cabin through the main crane, the hanging basket is put down to serve as a transfer station, the machine material and the operating personnel are manually unloaded and transported to the inside of the fan cabin, and meanwhile, the machine material and the operating personnel can be transferred through the transfer station after being bound by the hoisting belt.
5) Installing a high-altitude hoisting belt and a cable rope: the high-altitude hoisting belt binding operation is performed by standing an operator on a hanging basket lifted by a main crane, the hanging basket is firstly hoisted to the middle section of a blade, the middle section of the blade is hoisted and taken, a cable wind guiding rope is installed on the middle section hoisting belt, the rope end of the cable wind guiding rope is lowered to the ground, a lifting hook of an auxiliary crane is close to the hanging basket, the middle section hoisting belt is hung into a lifting hook of the auxiliary crane by the operator in the hanging basket, then the hanging basket is transported to the root of the blade, the binding of the root part of the blade is carried out, then the operator is hoisted to the top of a fan cabin together with the root part hoisting belt, the hanging basket is put down, and then the root part hoisting belt is hung into the lifting hook of the main crane. In the binding process, firstly, a blade protective sleeve is installed on the installation position of the lifting belt of the blade, and then the lifting belt is bound. When the middle section hoisting belt and the root hoisting belt are bound, the hanging basket is lifted to the upper side of the blade, then the hoisting belt is put down in half across the blade, then the hanging basket is transferred to the lower side of the blade, the hoisting belt is collected by the retractable hook and is alternately bound by the double-turn chokes.
6) And (3) separating and falling the blade by double-machine cooperation: as shown in fig. 3, after the lifting hooks of the main crane and the auxiliary crane are stressed, the connecting bolts of the paddles and the impellers are loosened, the main crane and the auxiliary crane are linked to cooperatively separate the paddles, and the replaced paddles are placed under the formulated ground in the modes of cooperative rotation, raking arms and retracting hooks under the assistance of a cable rope;
7) double-machine cooperation, 3-direction adjustment in position and positioning: the new blade is conveyed to an operation site through a lifting vehicle, then binding of a middle section lifting belt and binding of a root lifting belt of the new blade are carried out, a cable wind guide rope is installed on the middle section lifting belt, the middle section lifting belt and the root lifting belt are respectively tied and hung on an auxiliary crane and a main crane, then the new blade is lifted to a position 20cm away from the ground through the main crane and the auxiliary crane in a coordinated mode, after a screw rod is installed, the new blade is lifted to an impeller installation hole, the new blade is adjusted to be in a horizontal state through the main crane, the auxiliary crane and the cable wind rope, then the root of the new blade is aligned with the installation hole and gradually approaches to the installation hole, the root of the new blade is enabled to be butted into the installation hole, and positioning work is completed. If the impeller works at night, a commander in the impeller hub needs to command the butt joint of the new blades through the interphone and the highlight flashlight.
8) The double-machine cooperated with the new paddle part to be reported penetrates and is fastened: after the new blade is positioned, the position of the new blade is finely adjusted through the operation of the guy rope and the main and auxiliary cranes, the bolt rod of the new blade is slowly inserted into the corresponding bolt hole of the impeller, the bolts are symmetrically and manually installed by adopting a barring method in time, then the bolts are fastened by adopting a hydraulic torque wrench, and finally the hoisting belt and the guy rope are disassembled. Before fastening the bolts, an operator needs to confirm whether the installation accuracy is met according to the zero position on the impeller and the zero marking of the new blade, when the zero degree is staggered and the bolts and hole positions have deviation, the bolt holes are aligned to the blade bolts through the side plate vehicle of the impeller, the zero position in the impeller is adjusted and corrected after the bolts are fastened, and background parameters of the fan are reset, so that the consistency of the air postures of the three blades of the fan is ensured.
9) Unlocking, test run detection and acceptance: after the bolts are fastened and finished and the pitch system is cleared, the operator needs to check the electrical connection circuit of the pitch system, then the locking device is released, the power generation state of the fan is recovered, and trial operation is carried out when the wind speed reaches the operation wind speed. During the trial operation, the wind generating set needs to be comprehensively and safely tested in an emergency feathering mode, whether the three impellers are unbalanced in stress or not is judged through watching, listening and body perception, so that the set generates a resonance fault, and meanwhile, the conformance of the set before and after the vibration curve is disassembled is contrastingly analyzed through a background monitoring system of the fan.
The above-mentioned embodiments are only for convenience of illustration and not intended to limit the invention in any way, and those skilled in the art will be able to make equivalents of the features of the invention without departing from the technical scope of the invention.
Claims (9)
1. A high-altitude fan blade replacing method based on double-crane cooperation is characterized by comprising the following steps:
1) disassembling and assembling preparation: preparing roads and hoisting sites, evaluating weather conditions of construction, preparing hoisting equipment and machines and tools, and preparing operating personnel;
2) the double cranes are in place: adopting a double crane, wherein the double crane comprises a main crane and an auxiliary crane, and the main crane and the auxiliary crane are respectively positioned at two sides of a blade projection line to be replaced, wherein the lifting point of the main crane is positioned at the root part of the blade, and the lifting point of the auxiliary crane is positioned at the middle section of the blade;
3) yaw locking and barring: yawing the fan to a dismounting space, locking the yawing, turning the operating blades to be in a horizontal state, electrically braking, locking a mechanical locking pin, and reinforcing the main shaft by using a manual hoist to prevent rotation;
4) material machine ground air transportation: hoisting the machine tool materials and the operating personnel to the top of the fan cabin by a main crane by adopting a hanging basket, putting down the hanging basket as a transfer station, and manually unloading the machine tool materials and transferring the machine tool materials to the fan cabin;
5) installing a high-altitude hoisting belt and a cable rope: the method comprises the following steps that an operator stands on a hanging basket lifted by a main crane to perform high-altitude hoisting belt binding operation, the hanging basket is lifted to the middle section of a blade to bind a hoisting belt at the middle section of the blade, a cable wind guide rope is installed on the hoisting belt at the middle section, the rope end of the cable wind guide rope is lowered to the ground, a lifting hook of an auxiliary crane is close to the hanging basket, the middle section hoisting belt is tied by the operator in the hanging basket to be hung in a lifting hook of the auxiliary crane, then the hanging basket is conveyed to the root of the blade to bind the hoisting belt at the root of the blade, then the operator and the root hoisting belt are lifted to the top of a fan cabin, the hanging basket is put down, and then the root hoisting belt is tied in the lifting hook of the main crane;
6) and (3) separating and falling the blade by double-machine cooperation: after the main crane and the auxiliary crane lift the lifting hooks to exert force, loosening the connecting bolts of the paddles and the impellers, linking and cooperatively releasing the paddles by the main crane and the auxiliary crane, and placing the replaced paddles under the formulated ground by the aid of the cable rope in the modes of cooperative rotation, raking rods and retracting hooks;
7) double-machine cooperation, 3-direction adjustment in position and positioning: the new blade is transported to an operation site through a lifting vehicle, then the binding of a middle section hoisting belt and the binding of a root hoisting belt of the new blade are carried out, a cable wind guide rope is installed on the middle section hoisting belt, the middle section hoisting belt and the root hoisting belt are respectively tied and hung on an auxiliary crane and a main crane, then the new blade is lifted and hung to the ground from the lifting vehicle through the cooperation of the main crane and the auxiliary crane, after a screw rod is installed, the new blade is hoisted to an impeller installation hole, the new blade is adjusted to be in a horizontal state through the main crane, the auxiliary crane and the cable wind rope, then the root of the new blade is aligned with the installation hole and gradually approaches to the installation hole, so that the root of the new blade is butted into the installation hole, and the positioning work is completed;
8) the double-machine cooperated with the new paddle part to be reported penetrates and is fastened: after the new blade is positioned, slowly inserting a bolt rod of the new blade into a corresponding bolt hole of the impeller, installing and fastening a bolt, and finally disassembling a hoisting belt and a cable rope;
9) unlocking, test run detection and acceptance: and releasing the locking device, recovering the power generation state of the fan, and performing test operation detection and acceptance when the wind speed reaches the operation wind speed.
2. The high-altitude fan blade replacement method based on double-crane cooperation as claimed in claim 1, wherein the method comprises the following steps: in the step 1), traffic exploration is required to be carried out on roads, the road surface is trimmed, blocked tree branches and leaves are cut down, and pipelines are moved when necessary; arranging a hoisting field according to the positions of the double cranes, so that the gradient of the hoisting field is less than or equal to 1 percent, the compactness is more than or equal to 90 percent, and the plane elevation of the field is the same as the road surface elevation; comprehensive evaluation needs to be carried out on the lowest wind speed, the highest wind speed and the rain and fog weather of the site for 7 days in the future, and the construction day meeting the requirements is selected.
3. The high-altitude fan blade replacement method based on double-crane cooperation as claimed in claim 1, wherein the method comprises the following steps: in the step 1), the machine material comprises a hoisting belt, a blade protecting sleeve and a hoisting belt retracting hook; the operating personnel comprises 1 commander, 2 crane drivers, 3 persons for releasing and fastening bolts in the cabin, 2 persons for installing or removing lifting belt persons in the air, and the personnel in the wind power plant need to carry out safety technology communication and perform monitoring before the operation of the operating personnel.
4. The high-altitude fan blade replacement method based on double-crane cooperation as claimed in claim 1, wherein the method comprises the following steps: and 2), separating, staggering and confronting the main crane and the auxiliary crane below a blade projection line, and positioning the main crane and the auxiliary crane on a parallel road, wherein the main crane is positioned by adopting normal running, and the auxiliary crane is positioned by adopting a retreating type.
5. The high-altitude fan blade replacement method based on double-crane cooperation as claimed in claim 1, wherein the method comprises the following steps: in the step 5), firstly installing a blade protective sleeve at the installation position of a lifting belt of the blade, and then binding the lifting belt; when the middle section hoisting belt and the root hoisting belt are bound, the hanging basket is lifted to the upper side of the blade, then the hoisting belt is put down in half across the blade, then the hanging basket is transferred to the lower side of the blade, the hoisting belt is collected by the retractable hook and is alternately bound by the double-turn chokes.
6. The high-altitude fan blade replacement method based on double-crane cooperation as claimed in claim 1, wherein the method comprises the following steps: and 7) in the step 7), if the operation is carried out at night, a commander in the impeller hub needs to command the butt joint of the new blade through the interphone and the highlight flashlight.
7. The high-altitude fan blade replacement method based on double-crane cooperation as claimed in claim 1, wherein the method comprises the following steps: in the step 8), after the new blade is positioned, the position of the new blade is finely adjusted through the cable rope and the operation of the main and auxiliary cranes; after the bolt rod is inserted into the corresponding bolt hole of the impeller, the bolts are symmetrically and manually installed by adopting a turning method; the fastening bolt is fastened by a hydraulic torque wrench.
8. The high-altitude fan blade replacement method based on double-crane cooperation as claimed in claim 1, wherein the method comprises the following steps: in the step 8), an operator needs to confirm whether the installation accuracy is met according to the zero position on the impeller and the zero mark line of the new blade, and when the zero degree is staggered and the bolt and the hole position have deviation, the bolt hole is aligned to the blade bolt through the side turning gear of the impeller, the zero position in the impeller is adjusted and corrected after the bolt is fastened, and background parameters of the fan are reset, so that the consistency of the air postures of the three blades of the fan is ensured.
9. The high-altitude fan blade replacement method based on double-crane cooperation as claimed in claim 1, wherein the method comprises the following steps: in the step 9), after the bolts are fastened and the yard is cleared completely, an operator needs to check an electric connection circuit of the pitch system, and then the locking device is released to recover the power generation state of the fan; during the trial operation, the wind generating set needs to be comprehensively and safely tested in an emergency feathering mode, whether the three impellers are unbalanced in stress or not is judged through watching, listening and body perception, so that the set generates a resonance fault, and meanwhile, the conformance of the set before and after the vibration curve is disassembled is contrastingly analyzed through a background monitoring system of the fan.
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