A wind turbine blade limiting device and its limiting method for wind farm turbine dismantling

Abstract

This invention belongs to the field of wind turbine maintenance technology, and specifically relates to a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling. It includes a shroud and three blades, all arranged in a ring on the shroud. A lifting frame is provided on the front side of the shroud, and a turbine column is provided on one side of the lifting frame. The lifting frame and the turbine column are connected to a drive mechanism. Three connecting rods are fixedly provided on the side wall of the turbine column. This invention allows the wind turbine blades to quickly form a "Y" shape during dismantling, eliminating the need for frequent adjustments and improving the convenience of cranking control. It also ensures the stability of the sheath supporting the blades, and automatically adjusts the tension of the wind ropes on the blades according to the wind direction, ensuring the overall stability of the blades and preventing unnecessary swaying and displacement. It provides good limiting effect and can automatically trigger an alarm after the blades descend to an appropriate height, ensuring a suitable tailing distance.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine maintenance technology, and in particular relates to a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling. Background Technology

[0002] When the foundation of a wind turbine generator endangers the safety of the turbine due to external environmental factors, it is necessary to dismantle the turbine and tower, rebuild the foundation in situ, eliminate safety hazards, and ensure the safe operation of the wind farm. The safety of the wind turbine generator during the dismantling process is particularly important.

[0003] Wind turbine dismantling includes the removal of the turbine, generator, tower, and prestressed anchor bolts. During the dismantling of the turbine rotor, wind ropes need to be wrapped around two blades, and the rotor needs to be rotated to adjust the three blades into a "Y" shape (e.g.,...). Figure 1 As shown in the figure, the blades without wind ropes are located on the bottom side and are vertical. This can make the force even and facilitate the tailing when the blades move to the side close to the ground, so that the impeller as a whole is horizontal.

[0004] During the dismantling of the impeller, when adjusting the impeller to a "Y" shape, personnel need to use the positioning pins on the impeller casing and the positioning holes on the main unit for positioning. Since the personnel are located at the front of the impeller and are obstructed by the blades, multiple adjustments are required, and positioning pins need to be installed to complete the positioning. When the impeller descends, the change in wind direction from high to low altitude can easily cause the entire impeller to sway. Although ground personnel can adjust it using the wind ropes on both sides, the inability to adjust in time in the event of sudden changes in wind direction can pose certain safety hazards to the entire dismantling process. Therefore, we propose a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a wind turbine blade limiting device for wind farm turbine dismantling, comprising a guide shroud and three blades, the three blades being arranged in a ring on the guide shroud; a hanging frame is provided on the front side of the guide shroud, and a turbine column is provided on one side of the hanging frame; the hanging frame and the turbine column are connected together by a drive mechanism; three connecting rods are fixedly provided on the side wall of the turbine column, and each connecting rod is rotatably connected to a positioning rod; the rod wall of each positioning rod is abutting against the connection point between the blade and the side wall of the guide shroud; a supporting ring is sleeved on the outer side of the turbine column, and three strips are fixedly connected to the side wall of the supporting ring and the side wall of the turbine column; a cylinder is fixedly inserted into the end of each strip, and a connecting plate is fixedly connected to the output end of each cylinder. Each of the connecting plates has a protective sleeve fixed to its end, and each of the protective sleeves has an airbag sleeve fixed to its inner wall. One of the strip plates has a counterweight fixed to its end. The counterweight and the three airbag sleeves are connected to an inflation mechanism. A ground contact indicator mechanism is connected to the inflation mechanism. Grounding plates are provided on both sides below the supporting ring. Both grounding plates are connected to the supporting ring with a tensioning mechanism. An insulating box is provided below the inflation mechanism, and a rotating rod is rotatably connected to the lower end of the insulating box. A wind vane is provided on the rotating rod. A triggering mechanism that cooperates with the rotating rod is provided inside the insulating box. An adjustment mechanism that cooperates with the triggering mechanism is provided on both grounding plates. Multiple hanging rings are fixed to the upper ring wall of the supporting ring. A storage battery is fixed inside the machine column.

[0007] Preferably, the drive mechanism includes a hydraulic cylinder mounted on the side wall of the lifting frame, an output end of the hydraulic cylinder is fixed with a mounting plate, and the mounting plate is mounted with a housing by bolts. A drive motor is installed inside the housing, and an electromagnetic clutch is installed at the output end of the drive motor. A connecting shaft is fixed to the side wall of the electromagnetic clutch and is rotatably connected to the housing, and the end of the connecting shaft is fixedly connected to the machine column.

[0008] Preferably, the inflation mechanism includes a hollow plate fixedly disposed at the lower end of the counterweight, the side wall of the counterweight having a through hole, and an air pump connected to the hollow plate being disposed inside the through hole, the supporting ring having an annular vent hole inside, and the hollow plate having two air supply hoses connected to the annular vent hole, and each of the three strips having a vent groove connected to the annular vent hole inside, and each of the three vent grooves being connected to the airbag sleeve on the same side by a connecting hose.

[0009] Preferably, the ground contact indicator mechanism includes pressure tubes fixedly inserted into both sides of the end face of the hollow plate, and each pressure tube is equipped with a pressure valve. The two pressure tubes are fixedly connected to a base plate, and the interior of the base plate is hollow. An air jet hole is opened at the lower end of the base plate, and an inner conical insulating cover is fixedly installed at the lower end of the base plate outside the air jet hole. Insulating films are fixedly installed on both sides of the inner wall of the inner conical insulating cover. The inner walls of the insulating films and the inner walls of the inner conical insulating cover are coated with conductive coatings, and conductive cables are connected between the conductive coatings on the two insulating films. A buzzer connected to the two conductive coatings on the inner insulating cover is embedded in the end face of the base plate.

[0010] Preferably, both tensioning mechanisms include a winding mechanism fixedly disposed on the end face of the grounding plate, the winding mechanism having wind ropes wound up, and connecting ropes connected to the two wind ropes being tied to both ends of the side wall of the supporting ring. A supporting directional ring is fixedly disposed on the end face of the grounding plate, and the wind ropes are disposed through the supporting directional ring.

[0011] Preferably, the triggering mechanism includes a light-shielding plate fixedly disposed at the end of the rotating rod, and two arc-shaped LED strip lights are fixedly disposed at both ends of the upper inner wall of the insulating box, and the brightness of the two arc-shaped LED strip lights decreases from the middle to both sides. Arc-shaped photoresistors corresponding to the arc-shaped LED strip lights are fixed at both ends of the lower inner wall of the insulating box.

[0012] Preferably, both of the control mechanisms include a cover fixed to the end face of the grounding plate. The cover is fixed with a U-shaped plate by multiple springs, and a tension roller is rotatably provided inside the U-shaped plate. Multiple sliding rods that are slidably connected to the end face of the cover are fixed to the lower end of the U-shaped plate, and an iron plate is fixed to the lower end of the multiple sliding rods. An electromagnetic plate connected to an arc-shaped photoresistor on the opposite side is fixed to the end face of the grounding plate, and the electromagnetic plate is located inside the cover.

[0013] Preferably, each of the three strips is fixed with a support frame at its end, and each support frame is fixed with a stop switch connected to the cylinder on the same side at its end.

[0014] The limiting method of the blade limiting device for wind turbine dismantling in a wind farm, as described in any of the above claims, includes the following steps:

[0015] S1. The operator enters the hoisting frame and uses an external crane to lift the hoisting frame to the height of the fairing. By observing the wind direction observed by the wind vane, the operator moves the hoisting frame to the windward side using the crane. Together with the personnel inside the wind turbine nacelle, the operator adjusts the blades and fairing to the windward side.

[0016] S2. Start the hydraulic cylinder to move the machine box and the machine column towards the guide fairing side. With the help of the crane, keep the machine column and the guide fairing coaxial. At this time, under the action of the hydraulic cylinder, the three positioning rods will be inserted into the outside of the guide fairing. Then start the drive motor and electromagnetic clutch to make the machine column rotate by the connecting shaft until the side wall of the positioning rod abuts against the connection between the blade and the side wall of the guide fairing. At this time, manually start the cylinder until the sheath is inserted into the corresponding blade and then stop the cylinder.

[0017] S3. Start the air pump. Air can be delivered into the annular vent through the hollow plate and two air delivery hoses. Air can be filled into the three airbag sleeves through the venting groove and connecting hose. After the airbag sleeves expand and abut against the side wall of the blades, the bolts on the mounting plate can be removed manually. Under the gravity of the counterweight, the three blades can be rotated quickly into a "Y" shape.

[0018] S4. Connect and fix the two wind ropes to the two connecting ropes, and tighten the two wind ropes in conjunction with the winding mechanism. Then, install and fix the multiple hanging rings on the support ring to the lifting end of the external hoisting equipment. Then, the personnel inside the wind turbine nacelle will remove the flange connection between the fairing and the nacelle, and separate the hub connected to the blade from the main shaft. At this time, the support ring can be slowly lowered by the external hoisting equipment, and the two winding mechanisms will work in sync.

[0019] S5. During descent, if the wind direction changes, the wind vane will rotate accordingly, which will cause the rotating rod to rotate, and in turn, the light shield will rotate accordingly. The light shield will block the light emitted by the arc-shaped LED strip light, and the attraction force of the electromagnetic plate on the opposite side to the iron plate on the same side will change synchronously. In conjunction with the slide bar, U-shaped plate and tension roller, the tension of the wind rope on the same side can be automatically adjusted to counteract the pressure of the airflow on the three blades, keep the three blades in a stable state, and reduce the possibility of the blades moving downward and swaying.

[0020] S6. During the blade descent, when the blade is about 1 meter above the ground, the operator should stop the blade descent when the buzzer alarm is heard.

[0021] S7. Tie ropes to the vertical blades, then use external equipment to perform a tailing operation on the blades, so that the blades change from vertical to horizontal, and then lift the blades to the ground.

[0022] Compared with existing technologies, the advantages of a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling are as follows:

[0023] 1. Through the cooperation of the set hanging frame, machine column, drive mechanism, connecting rod and positioning rod, the three sheaths can be quickly positioned at the three blades by the rapid rotation of the positioning rod. Through the cooperation of the set support ring, strip plate, cylinder and connecting plate, the three sheaths can be quickly inserted into the corresponding blades. Through the set counterweight, the three blades after positioning can be quickly rotated into a "Y" shape under the action of gravity, without the need for frequent adjustment, thus improving the convenience of turning control.

[0024] 2. Through the cooperation of the set airbag sleeves and the inflation mechanism, the airbag sleeves inside each sheath can be made to fit tightly against the side wall of the blade by inflation, thereby ensuring the stability of the sheath's support for the blade.

[0025] 3. The ground contact warning mechanism can be set up to trigger a ground contact alarm by using the airflow generated by the inflation mechanism. The alarm will be triggered automatically when the blade descends to about 1.5 meters above the ground to ensure a suitable tailing distance.

[0026] 4. Through the coordinated operation of the grounding plate, tensioning mechanism, insulation box, rotating rod, wind vane, and triggering mechanism, the wind direction can be automatically detected by the wind vane, and the windward side can be automatically pulled back during the descent of the blades to maintain the stability of the blades during descent, prevent unnecessary swaying and displacement, and have a good limiting effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the shape and structure of the blade after it has been rotated and adjusted to a "Y" shape.

[0028] Figure 2 This is a schematic diagram of the structure of a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the drive mechanism of a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling provided by the present invention;

[0030] Figure 4 This is a schematic diagram of the connection structure between the strip plate and the sheath of a wind turbine blade limiting device and its limiting method for wind turbine dismantling in a wind farm provided by the present invention.

[0031] Figure 5 This is a schematic diagram of the internal structure of the sheath of a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling provided by the present invention;

[0032] Figure 6 This is a schematic diagram of the internal structure of the supporting ring of a wind turbine blade limiting device and limiting method for wind turbine dismantling in a wind farm provided by the present invention;

[0033] Figure 7This is a schematic diagram of the internal structure of the ground contact indication mechanism of the wind turbine blade limiting device and limiting method for wind farm turbine dismantling provided by the present invention;

[0034] Figure 8 This is a schematic diagram of the internal structure of the triggering mechanism of a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling provided by the present invention;

[0035] Figure 9 This is a top view of two arc-shaped photoresistors, which are part of a wind turbine blade limiting device and limiting method for wind farm dismantling provided by the present invention.

[0036] Figure 10 This is a schematic diagram of the internal structure of the control mechanism of a wind turbine blade limiting device and its limiting method for wind farm dismantling provided by the present invention.

[0037] In the diagram: 1. Draft fairing; 2. Blade; 3. Hanging frame; 4. Column; 5. Drive mechanism; 51. Hydraulic cylinder; 52. Mounting plate; 53. Housing; 54. Drive motor; 55. Electromagnetic clutch; 56. Connecting shaft; 6. Connecting rod; 7. Positioning rod; 8. Support ring; 9. Strip plate; 10. Cylinder; 11. Connecting plate; 12. Sheath; 13. Airbag sleeve; 14. Counterweight; 15. Inflation mechanism; 151. Hollow plate; 152. Air pump; 153. Annular vent; 154. Air delivery hose; 155. Vent groove; 156. Connecting hose; 16. Ground contact indicator mechanism; 161. Pressure pipe; 162. Base plate; 163. Inner cone insulation. 164. Insulating film; 165. Conductive coating; 166. Conductive cable; 167. Buzzer; 17. Grounding plate; 18. Tensioning mechanism; 181. Winding mechanism; 182. Guy rope; 183. Connecting rope; 184. Support directional ring; 19. Insulating box; 20. Rotating rod; 21. Wind vane; 22. Triggering mechanism; 221. Sunshade; 222. Curved LED strip light; 223. Curved photoresistor; 23. Control mechanism; 231. Machine cover; 232. U-shaped plate; 233. Tension roller; 234. Iron plate; 235. Electromagnetic plate; 24. Hanging ring; 25. Support frame; 26. Stop switch; 27. Battery. Detailed Implementation

[0038] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0039] like Figure 1-10As shown, a wind turbine blade limiting device and its limiting method for wind farm turbine dismantling include a shroud 1 and three blades 2. The three blades 2 are all located on the shroud 1 and are arranged in a ring. A lifting frame 3 is provided on the front side of the shroud 1, and a turbine column 4 is provided on one side of the lifting frame 3. The lifting frame 3 and the turbine column 4 are connected to a drive mechanism 5. The drive mechanism 5 includes a hydraulic cylinder 51 installed on the side wall of the lifting frame 3. A mounting plate 52 is fixed to the output end of the hydraulic cylinder 51, and a housing 53 is installed on the mounting plate 52 by bolts. A drive motor 54 is installed inside the housing 53, and an electromagnetic clutch is installed on the output end of the drive motor 54. 55. The side wall of the electromagnetic clutch 55 is fixed with a connecting shaft 56 that is rotatably connected to the housing 53, and the end of the connecting shaft 56 is fixedly connected to the machine column 4. The electromagnetic clutch 55 controls the engagement and disengagement of the clutch by switching the coil on and off. Before the control sleeve 12 engages with the blade 2, the electromagnetic clutch 55 is energized and engaged. At this time, the driving force of the drive motor 54 can be transmitted to the machine column 4 through the electromagnetic clutch 55 and the connecting shaft 56. After the sleeve 12 engages with the blade 2, the electromagnetic clutch 55 is de-energized, and the connecting shaft 56 can rotate automatically without being affected by the output shaft of the drive motor 54.

[0040] Three connecting rods 6 are fixedly installed on the side wall of the column 4, and each connecting rod 6 is rotatably connected to a positioning rod 7. The rod wall of each positioning rod 7 is abutted against the side wall connection between the blade 2 and the guide shroud 1. A support ring 8 is sleeved on the outer side of the column 4, and three strips 9 are fixedly connected to the side wall of the support ring 8 and the side wall of the column 4. A cylinder 10 is fixedly inserted into the end of each strip 9, and a connecting plate 11 is fixedly connected to the output end of each cylinder 10. Each plate end is fixed with a protective sleeve 12, and each end of the three strip plates 9 is fixed with a support frame 25. Each end of the support frame 25 is fixed with a stop switch 26 connected to the cylinder 10 on the same side. When the cylinder 10 drives the connecting plate 11 on the same side to move, the connecting plate 11 touches the stop switch 26, which will stop the corresponding cylinder 10 from working, preventing the protective sleeve 12 from shrinking too much and damaging the blade 2. Multiple hanging rings 24 are fixed on the upper ring wall of the support ring 8, and a storage battery 27 is fixed inside the column 4.

[0041] Each sheath 12 has an airbag sleeve 13 fixedly installed on its inner wall. A counterweight 14 is fixed to the end of one of the strips 9. The counterweight 14 and the three airbag sleeves 13 are connected to an inflation mechanism 15. The inflation mechanism 15 includes a hollow plate 151 fixedly installed at the lower end of the counterweight 14. A through hole is opened on the side wall of the counterweight 14, and an air pump 152 communicating with the hollow plate 151 is installed inside the through hole. An annular vent hole 153 is opened inside the supporting ring 8, and two holes communicating with the annular vent holes 153 are provided on the hollow plate 151. The air supply hose 154 and the three strips 9 each have an air groove 155 that is connected to the annular air vent 153. The three air grooves 155 are connected to the airbag sleeves 13 on the same side by a connecting hose 156. When the air pump 152 works, air can be injected into the three airbag sleeves 13 in conjunction with the hollow plate 151, air supply hose 154, annular air vent 153, air groove 155 and connecting hose 156, so that the airbag sleeves 13 and the blades 2 are tightly abutted and fitted. The side of the airbag sleeves 13 that is in contact with the blades 2 is provided with anti-slip and wear-resistant material.

[0042] A ground contact indicator 16 is connected to the inflation mechanism 15. The ground contact indicator 16 includes pressure tubes 161 fixedly inserted into both sides of the end face of the hollow plate 151. Each pressure tube 161 has a pressure valve inside. The two pressure tubes 161 are fixedly connected to a base plate 162. The base plate 162 is hollow inside. An air vent is opened at the lower end of the base plate 162. An inner conical insulating cover 163 is fixedly installed at the lower end of the base plate 162 outside the air vent. Insulating films 164 are fixedly installed on both sides of the inner wall of the inner conical insulating cover 163. The inner wall of the insulating film 164 and the inner wall of the inner cone insulating cover 163 are both coated with a conductive coating 165, and a conductive cable 166 is connected between the conductive coatings 165 on the two insulating films 164. A buzzer 167 connected to the two conductive coatings 165 on the inner insulating cover is embedded in the end face of the base plate 162. When subjected to the action of ground backflow, the insulating film 164 deforms and the two conductive coatings 165 on the same side come into contact. With the help of the conductive cable 166, the buzzer 167 can be turned on, so that the buzzer 167 can be used for alarm operation.

[0043] Both sides of the lower part of the support ring 8 are provided with grounding plates 17. Both grounding plates 17 are connected to the support ring 8 with a tensioning mechanism 18. Both tensioning mechanisms 18 include a winding mechanism 181 fixedly set on the end face of the grounding plate 17. Wind ropes 182 are wound on the winding mechanism 181. Both ends of the side wall of the support ring 8 are tied with connecting ropes 183 connected to the two wind ropes 182. A support directional ring 184 is fixedly set on the end face of the grounding plate 17, and the wind ropes 182 are set through the support directional ring 184. Through this setting, the two wind ropes 182 can be wound up to keep the blades 2 taut and secure, ensuring the stability of the blades 2.

[0044] An insulating box 19 is located below the inflation mechanism 15, and a rotating rod 20 is rotatably connected to the lower end of the insulating box 19. A wind vane 21 is mounted on the rotating rod 20. Inside the insulating box 19 is a triggering mechanism 22 that cooperates with the rotating rod 20. The triggering mechanism 22 includes a light-shielding plate 221 fixedly mounted on the end of the rotating rod 20. Arc-shaped LED strip lights 222 are fixedly mounted at both ends of the upper inner wall of the insulating box 19, and the brightness of the two arc-shaped LED strip lights 222 decreases from the center to the sides. Arc-shaped photoresistors 223 corresponding to the arc-shaped LED strip lights 222 are fixedly mounted at both ends of the lower inner wall of the insulating box 19. The light-shielding plate 221 blocks the light of the arc-shaped LED strip lights 222, causing a corresponding change in the resistance value of the corresponding arc-shaped photoresistors 223. 23 includes a photoresistor, a sliding rheostat, and an electromagnet. When the light intensity increases on the light-receiving surface of the arc-shaped photoresistor 223, its own photoresistance decreases, and the current flowing into the internal electromagnet increases. This allows the sliding rheostat's moving contact to move through magnetic attraction, keeping the rheostat's resistance at its maximum. When the light intensity decreases on the light-receiving surface of the arc-shaped photoresistor 223, its own photoresistance increases, and the current flowing into the internal electromagnet decreases, thus reducing the resistance of the sliding rheostat. In other words, when the light intensity decreases on the arc-shaped photoresistor 223, its resistance decreases accordingly. The wind vane 21 consists of a pointed rod and a sail at its tail. By sensing the wind direction through the sail, the rotating rod 20 can be rotated.

[0045] Each of the two ground planes 17 is equipped with a control mechanism 23 that cooperates with the trigger mechanism 22. Each control mechanism 23 includes a cover 231 fixed to the end face of the ground plane 17. The cover 231 is secured to a U-shaped plate 232 by multiple springs. A tension roller 233 is rotatably mounted inside the U-shaped plate 232. Multiple sliding rods that are slidably connected to the end face of the cover 231 are fixed to the lower end of the U-shaped plate 232. An iron plate 234 is fixed to the lower end of the multiple sliding rods. An electromagnetic plate 235 connected to the opposite-side arc-shaped photoresistor 223 is fixed to the end face of the ground plane 17. The plate 235 is located inside the cover 231. The current flowing through the electromagnetic plate 235 changes with the resistance of the corresponding arc-shaped photoresistor 223 (i.e., the electromagnetic plate 235 is electrically connected to the sliding rheostat inside the corresponding arc-shaped photoresistor 223). When the resistance of the arc-shaped photoresistor 223 decreases, the current flowing through the electromagnetic plate 235 increases. At this time, the magnetic attraction force generated by the electromagnetic plate 235 becomes stronger, which can attract the iron plate 234, the slide bar, the U-shaped plate 232 and the tension roller 233 to move downward, thereby increasing the tension of the wind rope 182 on this side.

[0046] The operating principle of this invention is described as follows: The operator enters the lifting frame 3 and lifts the lifting frame 3 to the height of the deflector 1 using an external crane. By observing the wind direction observed by the wind vane 21, the operator moves the lifting frame 3 to the windward side using the crane. With the help of the personnel inside the wind turbine nacelle, the blades 2 and the deflector 1 are adjusted to the windward side. Then, the hydraulic cylinder 51 is activated, which causes the turbine housing 53 to move the turbine column 4 towards the deflector 1. With the help of the crane, the turbine column 4 and the deflector 1 are kept coaxial. At this time, under the action of the hydraulic cylinder 51, the three positioning rods 7 will be inserted into the outside of the deflector 1. Then, the drive motor 54 and the electromagnetic clutch 55 are activated, which causes the turbine column 4 to rotate with the connecting shaft 56 until the side wall of the positioning rod 7 abuts against the side wall of the blade 2 and the deflector 1. At this time, each cylinder 10 is manually activated, which drives the sheath 12 to move towards the turbine column 4 through the connecting plate 11, so that the sheath 12 can be inserted into the corresponding blade 2.

[0047] At this time, the air pump 152 is started. Air can be delivered into the annular vent 153 through the hollow plate 151 and two air delivery hoses 154. Air can be filled into the three airbag sleeves 13 through the vent groove 155 and connecting hose 156. At this time, the airbag sleeves 13 expand and abut against the side wall of the blade 2 to ensure contact stability. At this time, the bolts on the mounting plate 52 are removed manually. Since the machine box 53 is not supported by the mounting plate 52 and the cylinder 51, under the gravity of the counterweight 14, it can cooperate with the strip plate 9, the support ring 8 and the three protective sleeves 12 to make the three blades 2 quickly rotate into a "Y" shape.

[0048] At this point, the two wind ropes 182 are connected and fixed to the two connecting ropes 183, and with the help of the winding mechanism 181, the two wind ropes 182 can be tightened. Then, the multiple hanging rings 24 on the support ring 8 are installed and fixed to the lifting end of the external hoisting equipment. Then, the personnel inside the wind turbine nacelle remove the flange connection between the fairing 1 and the nacelle, and separate the hub connected to the blade 2 from the main shaft. At this point, the support ring 8 can be slowly lowered by the external hoisting equipment, and the two winding mechanisms 181 simultaneously perform the winding work.

[0049] During descent, if the wind direction changes, the wind vane 21 will rotate accordingly, which in turn will cause the rotating rod 20 to rotate, and in turn, the light shield 221 will rotate accordingly to block the light emitted by the arc-shaped LED strip light 222. This will reduce the light received by the corresponding arc-shaped photoresistor 223. The greater the wind direction, the closer the light shield 221 is to the brightest part of the center of the arc-shaped LED strip light 222, meaning the less light is received by the arc-shaped photoresistor 223. As the resistance of the arc-shaped photoresistor 223 decreases, the magnetic attraction of the electromagnetic plate 235 on the opposite side will increase. This will increase the attraction of the electromagnetic plate 235 to the iron plate 234 on the same side. In turn, the sliding rod will drive the U-shaped plate 232 and the tension roller 233 to move downward, thereby pressing down the wind rope 182 on the same side and increasing the tension of the wind rope 182 to resist the pressure of the wind flow on the three blades 2, keeping the three blades 2 in a stable state and reducing the possibility of the blades 2 swaying downward.

[0050] When the air pump 152 fills the three airbag sleeves 13 with gas and inflates them completely, the excess air inside the hollow plate 151 will open the two pressure valves and spray the excess air out through the pressure pipe 161 and the base plate 162. At a distance of about 1.5 meters from the ground, the airflow will be obstructed by the ground and will tilt upwards and back up, causing the two insulating films 164 to be subjected to the backflow airflow, making the two conductive coatings 165 come into contact. This, together with the conductive cable 166, can connect the buzzer 167 circuit, which can then make the buzzer 167 start alarming to remind personnel to stop the descent of the blade 2. A pull rope is tied to the vertically set blade 2, and then the blade 2 is tailed by external equipment to change from a vertical position to a horizontal position.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wind turbine blade limiting device for wind farm turbine dismantling, comprising a guide shield (1) and three blades (2), characterized in that, The three blades (2) are arranged in a ring on the fairing (1). A hanging frame (3) is provided on the front side of the fairing (1), and a machine column (4) is provided on one side of the hanging frame (3). The hanging frame (3) and the machine column (4) are connected to a drive mechanism (5). Three connecting rods (6) are fixedly provided on the side wall of the machine column (4), and each connecting rod (6) is rotatably connected to a positioning rod (7). The rod wall of each positioning rod (7) is connected to the side of the blade (2) and the fairing (1). The wall connection is abutting each other. The outer side of the machine column (4) is fitted with a support ring (8), and the side wall of the support ring (8) and the side wall of the machine column (4) are fixedly connected with three strips (9). Each strip (9) is fixedly inserted with a cylinder (10) at its end, and each cylinder (10) is fixedly connected with a connecting plate (11) at its output end. Each connecting plate (11) is fixedly fitted with a protective sleeve (12) at its end, and each protective sleeve (12) is fixedly fitted with an airbag sleeve on its inner wall. 13), a counterweight (14) is fixed to the end of one of the strips (9). The counterweight (14) and the three airbag sleeves (13) are connected to an inflation mechanism (15). A ground contact indicator (16) is connected to the inflation mechanism (15). Ground contact plates (17) are provided on both sides below the support ring (8). Both ground contact plates (17) are connected to the support ring (8) to a tensioning mechanism (18). An insulating material is provided below the inflation mechanism (15). The insulating box (19) is rotatably connected to the lower end of the insulating box (19), and the rotating rod (20) is provided with a wind vane (21) on the rotating rod (20). The insulating box (19) is provided with a triggering mechanism (22) that cooperates with the rotating rod (20), and the two ground plates (17) are provided with a control mechanism (23) that cooperates with the triggering mechanism (22). The upper ring wall of the supporting ring (8) is fixed with multiple hanging rings (24), and the machine column (4) is fixed with a storage battery (27).

2. The wind turbine blade limiting device for wind farm turbine dismantling according to claim 1, characterized in that, The drive mechanism (5) includes a hydraulic cylinder (51) installed on the side wall of the hanging frame (3). The output end of the hydraulic cylinder (51) is fixed with a mounting plate (52), and the mounting plate (52) is bolted to a housing (53). The housing (53) is equipped with a drive motor (54), and the output end of the drive motor (54) is equipped with an electromagnetic clutch (55). The side wall of the electromagnetic clutch (55) is fixed with a connecting shaft (56) that is rotatably connected to the housing (53), and the end of the connecting shaft (56) is fixedly connected to the machine column (4).

3. The wind turbine blade limiting device for wind farm turbine dismantling according to claim 1, characterized in that, The inflation mechanism (15) includes a hollow plate (151) fixedly installed at the lower end of the counterweight (14). The side wall of the counterweight (14) has a through hole, and the inside of the through hole is provided with an air pump (152) connected to the hollow plate (151). The inside of the supporting ring (8) has an annular vent hole (153), and the hollow plate (151) is provided with two air supply hoses (154) connected to the annular vent hole (153). The inside of each of the three strips (9) is provided with a ventilation groove (155) connected to the annular vent hole (153), and each of the three ventilation grooves (155) is connected to the airbag sleeve (13) on the same side with a connecting hose (156).

4. The wind turbine blade limiting device for wind farm turbine dismantling according to claim 3, characterized in that, The ground contact indicator (16) includes pressure tubes (161) fixedly inserted into both sides of the end face of the hollow plate (151), and each of the two pressure tubes (161) is provided with a pressure valve. The two pressure tubes (161) are fixedly connected to a base plate (162), and the interior of the base plate (162) is hollow. An air jet hole is opened at the lower end of the base plate (162), and an inner cone insulating cover (163) is fixedly provided at the lower end of the base plate (162) outside the air jet hole. An insulating film (164) is fixedly provided on both sides of the inner wall of the inner cone insulating cover (163). The inner wall of the insulating film (164) and the inner wall of the inner cone insulating cover (163) are coated with a conductive coating (165), and a conductive cable (166) is connected between the conductive coatings (165) on the two insulating films (164). A buzzer (167) connected to the two conductive coatings (165) on the inner insulating cover is embedded in the end face of the base plate (162).

5. A wind turbine blade limiting device for wind farm turbine dismantling according to claim 1, characterized in that, Both tensioning mechanisms (18) include a winding mechanism (181) fixedly installed on the end face of the grounding plate (17). A wind rope (182) is wound on the winding mechanism (181). Both ends of the side wall of the support ring (8) are tied with connecting ropes (183) connected to the two wind ropes (182). A support directional ring (184) is fixedly provided on the end face of the grounding plate (17), and the wind rope (182) passes through the support directional ring (184).

6. A wind turbine blade limiting device for wind farm turbine dismantling according to claim 1, characterized in that, The triggering mechanism (22) includes a light shield (221) fixedly installed at the end of the rotating rod (20). Both ends of the upper inner wall of the insulating box (19) are fixedly provided with arc-shaped LED strip lights (222), and the brightness of the two arc-shaped LED strip lights (222) decreases from the middle to both sides. Both ends of the lower inner wall of the insulating box (19) are fixed with arc-shaped photoresistors (223) corresponding to the arc-shaped LED strip lights (222).

7. A wind turbine blade limiting device for wind farm turbine dismantling according to claim 6, characterized in that, Both of the aforementioned control mechanisms (23) include a cover (231) fixed to the end face of the grounding plate (17). The cover (231) is fixed with a U-shaped plate (232) by multiple springs. A tension roller (233) is rotatably provided inside the U-shaped plate (232). Multiple sliding rods that are slidably connected to the end face of the cover (231) are fixed at the lower end of the U-shaped plate (232). An iron plate (234) is fixed at the lower end of the multiple sliding rods. An electromagnetic plate (235) connected to the opposite side arc-shaped photoresistor (223) is fixed at the end face of the grounding plate (17). The electromagnetic plate (235) is located inside the cover (231).

8. A wind turbine blade limiting device for wind farm turbine dismantling according to claim 1, characterized in that, Each of the three strips (9) is fixed with a support frame (25), and each support frame (25) is fixed with a stop switch (26) connected to the cylinder (10) on the same side.

9. A limiting method for a wind turbine blade limiting device for wind farm dismantling according to any one of claims 1-8, characterized in that, The limiting method includes the following steps: S1. The operator enters the hoisting frame (3) and lifts the hoisting frame (3) to the height of the fairing (1) by an external crane. By observing the wind direction observed by the wind vane (21), the operator moves the hoisting frame (3) to the windward side by a crane. In cooperation with the personnel inside the wind turbine nacelle, the operator adjusts the blades (2) and fairing (1) to the windward side. S2. Start the hydraulic cylinder (51) to make the machine box (53) drive the machine column (4) to move towards the guide shield (1) side, and coordinate with the crane to keep the machine column (4) and the guide shield (1) coaxial. At this time, under the action of the hydraulic cylinder (51), the three positioning rods (7) will be inserted into the outside of the guide shield (1). Then start the drive motor (54) and the electromagnetic clutch (55), and coordinate with the connecting shaft (56) to make the machine column (4) rotate until the side wall of the positioning rod (7) abuts against the side wall of the blade (2) and the guide shield (1). At this time, the cylinder (10) is started manually until the sheath (12) is inserted into the corresponding blade (2), and then the cylinder (10) stops working. S3. Start the air pump (152) and deliver airflow into the annular vent (153) through the hollow plate (151) and two air delivery hoses (154). Then, fill the three airbag sleeves (13) with air through the ventilation groove (155) and connecting hose (156). At this time, the airbag sleeves (13) expand and abut against the side wall of the blades (2). Then, manually remove the bolts on the mounting plate (52). Under the gravity of the counterweight (14), the three blades (2) will quickly rotate into a "Y" shape. S4. Connect and fix the two wind ropes (182) to the two connecting ropes (183), and tighten the two wind ropes (182) in conjunction with the winding mechanism (181). Then install and fix the multiple hanging rings (24) on the support ring (8) to the lifting end of the external hoisting equipment. Then, the personnel inside the wind turbine nacelle will remove the flange connection between the fairing (1) and the nacelle, and separate the hub connected to the blade (2) from the main shaft. At this time, the support ring (8) will be slowly lowered by the external hoisting equipment, and the two winding mechanisms (181) will perform the winding work simultaneously. S5. During the descent, if the wind direction changes, the wind vane (21) will rotate accordingly, which will cause the rotating rod (20) to rotate, and then the light shield (221) will rotate accordingly. The light shield (221) will block the light emitted by the arc-shaped LED strip light (222), and the attraction force of the electromagnetic plate (235) on the same side to the iron plate (234) on the same side will change synchronously. In conjunction with the slide rod, U-shaped plate (232) and tension roller (233), the tension of the wind rope (182) on the same side will be automatically adjusted to resist the pressure of the wind on the three blades (2), so that the three blades (2) remain stable and reduce the possibility of the blades (2) moving downward and swaying. S6. During the descent of the blade (2), when it is about 1.5 meters above the ground, the operator should stop the descent of the blade (2) when the buzzer (167) is heard. S7. Tie a rope to the vertical blade (2), and then use external equipment to perform a tailing operation on the blade (2) so that the blade (2) changes from vertical to horizontal, and then lift the blade (2) to the ground.

Images