A wind turbine blade deicing device and installation and use method

Abstract

The present invention discloses a wind turbine blade deicing device and an installation and use method, which belongs to the technical field of wind power generation. The invention solves the problem that the air holes of the existing device are only arranged at the ends of the fan blades. When the ice layer around the air holes is cleared, the compressed air cannot clean the ice layer at the remaining positions of the fan blades, and the cleaning effect of the ice layer is poor. The invention adopts the following scheme: the device comprises a fan blade, the front and rear sides of the fan blade are covered with a flexible coating, the strip-shaped through groove corresponds to the position of the flexible coating, the inner wall of the cavity is fixedly mounted with a mounting plate, the mounting plate is provided with a driving assembly, and the driving assembly is provided with a deicing assembly. During the movement of the moving column, the deicing balls on the arc surface of the moving column can be alternately contacted with the flexible coating, so as to avoid the occurrence of the situation that the flexible coating is damaged by the deicing balls, thereby achieving the purpose of comprehensively cleaning the ice layer on the front and rear side walls of the fan blades.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind turbine blade deicing device and an installation and use method thereof. Background Art

[0002] Wind power generation uses wind power to drive the windmill blades to rotate, and then increases the rotation speed through a speed increaser to drive the generator to generate electricity. Existing wind turbine blades are provided with cavities and heat-conducting structures inside. Heat-conducting blocks and heating elements can be installed in the cavity to solve the problem of ice accumulation on the blades.

[0003] After searching, the application with patent number 202111468454.8 discloses a wind turbine blade deicing device and installation and use method, which includes a plurality of air holes processed at the end of the fan blade, and the outside of the air holes and the surface of the fan blade are covered with a flexible film; the air holes are connected to an air supply pipeline for air supply, and the air supply pipeline is connected to an air source device for providing high-pressure gas; an exhaust pipeline is arranged on the air supply pipeline;

[0004] Although the wind turbine blade deicing device uses compressed air to bulge the flexible covering film and destroy the ice structure from the bottom to achieve deicing, the air holes of the wind turbine blade deicing device are only arranged at the ends of the fan blades. When the ice layer around the air holes is cleared, the compressed air cannot clean the ice layer at the rest of the fan blades, and the cleaning effect of the ice layer is poor.

[0005] Therefore, we propose a wind turbine blade deicing device and an installation and use method. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a wind turbine blade deicing device and an installation and use method, which solves the problem that the air holes of the prior art device are only arranged at the ends of the fan blades. When the ice layer around the air holes is cleared, the compressed air cannot clean the ice layer at the rest of the fan blades, resulting in a poor ice cleaning effect.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a wind turbine blade deicing device and installation and use method, comprising a fan blade, a flange is fixedly installed at the right end of the fan blade, a cavity is arranged inside the fan blade, a heat conduction structure is arranged inside the cavity, and both the front and rear sides of the fan blade are covered with a flexible coating;

[0008] The front and rear sides of the fan blades are symmetrically provided with strip-shaped through grooves connected to the cavity and distributed in a linear array, the strip-shaped through grooves correspond to the positions of the flexible covering films, a mounting plate is fixedly installed on the inner wall of the cavity, connecting grooves are symmetrically provided on the front and rear sides of the top surface of the mounting plate, a sliding groove connected to the connecting groove is penetrated through the right side of the top surface of the mounting plate, a driving assembly is provided on the mounting plate, a deicing assembly is provided on the driving assembly, and the driving assembly drives the deicing assembly to reciprocate along the inner wall of the connecting groove;

[0009] The deicing assembly includes a moving column, a telescopic rod distributed in a ring array is fixedly installed in the middle of the curved surface of the moving column, a deicing ball is provided at the end of the telescopic rod away from the moving column, a ring gear is fixedly sleeved on the bottom end of the outer surface of the moving column, and symmetrically distributed racks are fixedly installed on both sides of the middle of the top surface of the fan blade, and the two racks are respectively meshed with the ring gear on the same side thereof.

[0010] As a preferred solution of the wind turbine blade deicing device described in the present invention, the telescopic rod includes a fixed rod fixedly installed in the middle of the curved surface of the moving column and distributed in a ring-shaped array, the interior of the fixed rod is hollow and the moving rod is movably mounted thereon; wherein the moving rod can move along the inner wall of the fixed rod.

[0011] As a preferred solution of the wind turbine blade deicing device described in the present invention, the deicing ball is fixedly mounted on one end of the moving rod away from the fixed rod, a spring is arranged inside the fixed rod, one end of the spring is fixedly mounted on the inner wall of the fixed rod, and the other end of the spring is fixedly mounted on the end surface of the moving rod close to one end of the fixed rod; wherein the moving rod and the fixed rod can be connected together by the spring.

[0012] As a preferred solution of the wind turbine blade deicing device described in the present invention, the diameter of the deicing ball matches the width of the strip through slot, and the spring can push the deicing ball at the end of the movable rod to pass through the strip through slot and extend to the outside of the wind turbine blade; wherein the spring can push the deicing ball to pass through the strip through slot and contact the flexible covering film, thereby causing the flexible covering film to bulge.

[0013] As a preferred solution of the wind turbine blade deicing device described in the present invention, the driving assembly includes a motor fixedly installed in the middle of the right end surface of the mounting plate, the output end of the motor extends to the inside of the slide slot and is fixedly installed with a driving gear; wherein the motor can drive the driving gear to rotate alternately forward and reverse.

[0014] As a preferred solution of the wind turbine blade deicing device described in the present invention, a threaded rod is rotatably mounted on the inner wall of the connecting groove through a bearing ring, and a driven gear meshing with the driving gear is fixedly mounted on one end of the outer surface of the threaded rod close to the driving gear; wherein, when the driving gear rotates, the driven gears on both sides thereof can be driven to rotate, and the driven gears on both sides rotate in opposite directions.

[0015] As a preferred solution of the wind turbine blade deicing device described in the present invention, the outer surface of the threaded rod is threadedly sleeved with a slider, and the movable column is rotatably mounted on the top surface of the slider through a bearing ring; wherein, the movable column is convenient for rotating on the top surface of the slider.

[0016] As a preferred solution of the installation and use method of the wind turbine blade deicing device of the present invention, the installation and use method comprises the following steps:

[0017] Step 1: providing strip-shaped through grooves connected to the cavity and distributed in a linear array on the front and rear side walls of the fan blades;

[0018] Step 2: Weld the driven gear to the outer surface of the threaded rod, then rotate and install the threaded rod inside the connecting groove through the bearing ring, and keep the slider sliding inside the connecting groove, then rotate and install the moving column on the top surface of the slider through the bearing ring, then weld the ring gear to the bottom end of the outer surface of the moving column, then weld the rack to the top surface of the mounting plate, and keep the rack and the ring gear meshing, then install the motor in the middle of the right end surface of the mounting plate, then install the driving gear on the output end of the motor, and keep the driving gear meshing with the driven gear, and finally install the mounting plate inside the fan blade.

[0019] Step 3: Cover the front and rear sides of the fan blades with a flexible coating corresponding to the position of the strip-shaped through grooves.

[0020] Step 3: When ice forms on the surface of the fan blade, the heat-conducting structure inside the fan blade is activated to heat it. Then the side of the ice layer in contact with the fan blade will melt, and the small ice crystals will fall off under the centrifugal force generated by the rotation of the fan blade.

[0021] Step 4: If the ice layer is thicker, the motor is started to drive the driving gear to rotate, and then the driving gear drives the driven gear and the threaded rod on both sides to rotate, and the rotation directions of the threaded rod and the driven gear on both sides are opposite, and then the sliders on both sides are driven to move in the opposite direction along the connecting groove. When the slider moves, the de-icing assembly can be driven to move together. When the moving column moves, due to the meshing of the annular gear and the rack, the moving column and the telescopic rod on the arc surface and the de-icing ball can be rotated on the top surface of the slider. When the de-icing ball passes through the strip groove, the spring pushes the moving rod and the de-icing ball to move into the strip groove. The de-icing ball contacts the flexible coating, which can make the flexible coating bulge outward, and then destroy the ice coating structure, so that the ice layer breaks and falls off, and the de-icing ball will also contact the inner wall of the fan blade. In the process of moving along the inner wall of the connecting groove, the de-icing ball will intermittently hit the inner wall of the fan blade, causing the ice layer to fall off.

[0022] The present invention provides a wind turbine blade deicing device and an installation and use method.

[0023] Beneficial effects:

[0024] 1. The de-icing device for wind turbine blades and its installation and use method drive the de-icing component to reciprocate along the inner wall of the connecting groove through the driving component. When the de-icing ball passes through the strip-shaped through groove, the spring arranged inside the fixed rod can push the de-icing ball to contact with the flexible coating, thereby causing the flexible coating to bulge, so that ice on the surface of the flexible coating can be broken and dropped. Through the arrangement of the annular gear and the rack, during the movement of the moving column, the moving column will rotate, thereby driving the de-icing ball and the telescopic rod to rotate together, so that the de-icing ball on the arc surface of the moving column can alternately contact with the flexible coating, thereby preventing the flexible coating from being worn and damaged by the de-icing ball, thereby achieving the purpose of comprehensively cleaning the ice layer on the front and rear side walls of the fan blades, and the cleaning effect is good, and the problem that the air holes of the existing device are only arranged at the ends of the fan blades, when the ice layer around the air holes is cleared, the compressed air cannot clean the ice layer at the remaining positions of the fan blades, and the cleaning effect of the ice layer is poor;

[0025] 2. The wind turbine blade deicing device and its installation and use method can make contact with the inner wall of the fan blade through the deicing ball. When the moving column rotates, the deicing ball can be driven to hit the inner wall of the fan blade, thereby causing the internal part of the fan blade to vibrate, which can promote the falling of broken ice on the surface of the fan blade, and help to speed up the deicing rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic structural diagram of a fan blade close to one end of the flange of the present invention;

[0028] Figure 3 It is a schematic diagram of the side view structure of the fan blade of the present invention near one end of the flange;

[0029] Figure 4 It is a schematic cross-sectional view of the fan blade of the present invention near one end of the flange;

[0030] Figure 5 It is a schematic diagram of the structure of the mounting plate and the driving assembly of the present invention near one end of the flange;

[0031] Figure 6 It is a structural schematic diagram of the mounting plate of the present invention close to one end of the flange;

[0032] Figure 7 It is a schematic structural diagram of the deicing assembly of the present invention.

[0033] In the figure: 1. fan blade; 11. flange; 12. strip-shaped through groove; 13. flexible coating; 14. cavity; 2. mounting plate; 21. slide groove; 22. connecting groove; 3. drive assembly; 31. motor; 32. driving gear; 33. threaded rod; 34. driven gear; 35. slider; 4. deicing assembly; 41. moving column; 42. telescopic rod; 421. fixed rod; 422. moving rod; 43. deicing ball; 44. ring gear; 45. rack. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figure 1-7 The embodiment of the present invention provides a technical solution: a wind turbine blade deicing device and an installation and use method, comprising a fan blade 1, a flange 11 is fixedly installed at the right end of the fan blade 1, a cavity 14 is arranged inside the fan blade 1, a heat conducting structure is arranged inside the cavity 14, and both the front and rear sides of the fan blade 1 are covered with a flexible coating 13;

[0036] The front and rear sides of the fan blade 1 are symmetrically provided with strip-shaped through grooves 12 connected to the cavity 14 and distributed in a linear array. The strip-shaped through grooves 12 correspond to the positions of the flexible covering film 13. A mounting plate 2 is fixedly installed on the inner wall of the cavity 14. The front and rear sides of the top surface of the mounting plate 2 are symmetrically provided with connecting grooves 22. A sliding groove 21 connected to the connecting groove 22 is penetrated and provided on the right side of the top surface of the mounting plate 2. A driving component 3 is provided on the mounting plate 2. A deicing component 4 is provided on the driving component 3. The driving component 3 drives the deicing component 4 to reciprocate along the inner wall of the connecting groove 22.

[0037] The de-icing assembly 4 includes a moving column 41, on the middle of the curved surface of which a telescopic rod 42 distributed in a ring array is fixedly installed, and an end of the telescopic rod 42 away from the moving column 41 is provided with a de-icing ball 43, and the bottom end of the outer surface of the moving column 41 is fixedly sleeved with a ring gear 44, and symmetrically distributed racks 45 are fixedly installed on both sides of the middle of the top surface of the fan blade 1, and the two racks 45 are respectively meshed with the ring gear 44 on the same side thereof.

[0038] The telescopic rod 42 includes a fixed rod 421 fixedly installed in the middle of the curved surface of the movable column 41 and distributed in a ring-shaped array. The interior of the fixed rod 421 is hollow and the movable rod 422 is movably mounted thereon; wherein the movable rod 422 can move along the inner wall of the fixed rod 421 .

[0039] The de-icing ball 43 is fixedly mounted on one end of the moving rod 422 away from the fixed rod 421. A spring is arranged inside the fixed rod 421. One end of the spring is fixedly mounted on the inner wall of the fixed rod 421, and the other end of the spring is fixedly mounted on the end face of the moving rod 422 close to one end of the fixed rod 421. The moving rod 422 and the fixed rod 421 can be connected together by the spring.

[0040] The diameter of the de-icing ball 43 matches the width of the strip groove 12, and the spring can push the de-icing ball 43 at the end of the movable rod 422 to pass through the strip groove 12 and extend to the outside of the fan blade 1; wherein, the spring can push the de-icing ball 43 to pass through the strip groove 12 and contact the flexible coating 13, thereby causing the flexible coating 13 to bulge.

[0041] The driving assembly 3 includes a motor 31 fixedly mounted in the middle of the right end surface of the mounting plate 2, the output end of the motor 31 extends to the inside of the slide slot 21 and is fixedly mounted with a driving gear 32; wherein the motor 31 can drive the driving gear 32 to rotate alternately forward and reverse.

[0042] A threaded rod 33 is rotatably mounted on the inner wall of the connecting groove 22 through a bearing ring, and a driven gear 34 meshing with the driving gear 32 is fixedly sleeved on one end of the outer surface of the threaded rod 33 close to the driving gear 32; wherein, when the driving gear 32 rotates, it can drive the driven gears 34 on both sides thereof to rotate, and the driven gears 34 on both sides rotate in opposite directions.

[0043] The outer surface of the threaded rod 33 is threadedly sleeved with a slider 35 , and the moving column 41 is rotatably mounted on the top surface of the slider 35 via a bearing ring, so that the moving column 41 can rotate on the top surface of the slider 35 .

[0044] Embodiment 2: As a preferred solution of the installation and use method of the wind turbine blade deicing device of the present invention, the installation and use method comprises the following steps:

[0045] Step 1: A strip-shaped through groove 12 connected to the cavity 14 and distributed in a linear array is provided on the front and rear side walls of the fan blade 1;

[0046] Step 2: Weld the driven gear 34 to the outer surface of the threaded rod 33, and then rotate the threaded rod 33 to install it inside the connecting groove 22 through the bearing ring, and keep the slider 35 slidingly sleeved inside the connecting groove 22, and then rotate the moving column 41 to install it on the top surface of the slider 35 through the bearing ring, and then weld the ring gear 44 to the bottom end of the outer surface of the moving column 41, and then weld the rack 45 to the top surface of the mounting plate 2, and keep the rack 45 and the ring gear 44 meshing, and then install the motor 31 in the middle of the right end surface of the mounting plate 2, and then install the driving gear 32 on the output end of the motor 31, and keep the driving gear 32 meshing with the driven gear 34, and finally install the mounting plate 2 inside the fan blade 1.

[0047] Step three: Cover the front and rear sides of the fan blade 1 with a flexible coating 13 corresponding to the position of the strip-shaped through slot 12 .

[0048] Step 3: When the surface of the fan blade 1 is frozen, the heat-conducting structure inside the fan blade 1 is started to heat it, and then the side of the ice layer in contact with the fan blade 1 will melt, and small ice crystals will fall under the action of the centrifugal force generated when the fan blade 1 rotates.

[0049] Step 4: If the ice layer is thick, the motor 31 is started to drive the driving gear 32 to rotate, and then the driving gear 32 drives the driven gear 34 and the threaded rod 33 on both sides to rotate, and the threaded rod 33 and the driven gear 34 on both sides rotate in opposite directions, and then drives the sliders 35 on both sides to move in opposite directions along the connecting groove 22. When the slider 35 moves, it can drive the de-icing assembly 4 to move together. When the moving column 41 moves, the ring gear 44 is meshed with the rack 45, which can make the moving column 41 and the extension on the arc surface thereof The retractable rod 42 and the de-icing ball 43 rotate on the top surface of the slider 35. When the de-icing ball 43 passes through the strip groove 12, the spring pushes the moving rod 422 and the de-icing ball 43 to move into the strip groove 12. The de-icing ball 43 contacts the flexible coating 13, which can make the flexible coating 13 bulge outward, thereby destroying the ice layer structure, causing the ice layer to break and fall off, and the de-icing ball 43 will also contact the inner wall of the fan blade 1. During the movement of the de-icing ball 43 along the inner wall of the connecting groove 22, it will intermittently hit the inner wall of the fan blade 1, causing the ice layer to fall off.

[0050] Working principle and use process of the present invention: When the deicing device for wind turbine blades is used, the motor 31 is first started to drive the driving gear 32 to rotate alternately forward and reverse. The driving gear 32 is meshed with the driven gear 34, which can drive the driven gears 34 and the threaded rod 33 on both sides to rotate, and then the slider 35 and the deicing assembly 4 on the top thereof are reciprocated along the inner wall of the connecting groove 22. Since the driven gears 34 and the threaded rod 33 on both sides rotate in opposite directions, the sliders 35 and the deicing assembly 4 on both sides move in opposite directions. During the movement of the deicing assembly 4, the ring gear 44 and the rack 45 are meshed, which can make the moving column 35 move back and forth. 41 rotates on the top surface of the slider 35. In the process of the moving column 41 moving along the connecting groove 22 and rotating itself, when the de-icing ball 43 passes through the strip groove 12, under the action of the internal spring of the moving rod 422, the fixing rod 421 and the de-icing ball 43 can be pushed to the side close to the flexible coating 13, and then the de-icing ball 43 passes through the strip groove 12 and contacts with the flexible coating 13, so that the flexible coating 13 can be bulged, and then the ice cubes around the flexible coating 13 are broken and fall off. When the de-icing ball 43 contacts with the inner wall of the fan blade 1, it can knock the inner wall of the fan blade 1, so that the inside of the fan blade 1 can vibrate, and then the ice cubes can fall off.

[0051] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A wind turbine blade deicing device, comprising a fan blade (1), a flange (11) being fixedly mounted at the right end of the fan blade (1), a cavity (14) being arranged inside the fan blade (1), a heat conducting structure being arranged inside the cavity (14), and a flexible coating (13) being covered on both the front and rear sides of the fan blade (1); Features: The fan blade (1) is symmetrically provided with strip-shaped through grooves (12) connected to the cavity (14) and distributed in a linear array on the front and rear sides, the strip-shaped through grooves (12) corresponding to the position of the flexible covering film (13), the inner wall of the cavity (14) is fixedly provided with a mounting plate (2), the front and rear sides of the top surface of the mounting plate (2) are symmetrically provided with connecting grooves (22), the right side of the top surface of the mounting plate (2) is penetrated by a sliding groove (21) connected to the connecting groove (22), the mounting plate (2) is provided with a driving component (3), the driving component (3) is provided with a deicing component (4), and the driving component (3) drives the deicing component (4) to move back and forth along the inner wall of the connecting groove (22); The deicing assembly (4) comprises a moving column (41), a telescopic rod (42) distributed in a ring array is fixedly installed in the middle of the curved surface of the moving column (41), a deicing ball (43) is arranged at one end of the telescopic rod (42) away from the moving column (41), a ring gear (44) is fixedly sleeved on the bottom end of the outer surface of the moving column (41), and symmetrically distributed racks (45) are fixedly installed on both sides of the middle of the top surface of the fan blade (1), and the two racks (45) are respectively meshed with the ring gear (44) on the same side thereof.

2. A wind turbine blade deicing device according to claim 1, characterized in that: The telescopic rod (42) comprises a fixed rod (421) fixedly mounted in the middle of the curved surface of the moving column (41) and distributed in a ring-shaped array. The interior of the fixed rod (421) is hollow and the moving rod (422) is movably mounted thereon.

3. A wind turbine blade deicing device according to claim 2, characterized in that: The de-icing ball (43) is fixedly mounted on one end of the moving rod (422) away from the fixed rod (421); a spring is arranged inside the fixed rod (421); one end of the spring is fixedly mounted on the inner wall of the fixed rod (421); and the other end of the spring is fixedly mounted on the end surface of the moving rod (422) close to one end of the fixed rod (421).

4. A wind turbine blade deicing device according to claim 3, characterized in that: The diameter of the de-icing ball (43) matches the width of the strip-shaped through slot (12), and the spring can push the de-icing ball (43) at the end of the moving rod (422) to pass through the strip-shaped through slot (12) and extend to the outside of the fan blade (1).

5. A wind turbine blade deicing device according to claim 1, characterized in that: The driving assembly (3) comprises a motor (31) fixedly mounted on the middle of the right end surface of the mounting plate (2); the output end of the motor (31) extends into the interior of the slide slot (21) and is fixedly mounted with a driving gear (32).

6. A wind turbine blade deicing device according to claim 5, characterized in that: A threaded rod (33) is rotatably mounted on the inner wall of the connection groove (22) via a bearing ring, and a driven gear (34) meshing with the driving gear (32) is fixedly sleeved on one end of the outer surface of the threaded rod (33) close to the driving gear (32).

7. A wind turbine blade deicing device according to claim 6, characterized in that: The outer surface of the threaded rod (33) is threadedly sleeved with a slider (35), and the moving column (41) is rotatably mounted on the top surface of the slider (35) via a bearing ring.

8. A method for installing and using a wind turbine blade deicing device according to any one of claims 1 to 7, characterized in that: The installation and use method comprises the following steps: Step 1: providing strip-shaped through grooves (12) on the front and rear side walls of the fan blade (1) which are connected to the cavity (14) and are distributed in a linear array; Step 2: Weld the driven gear (34) to the outer surface of the threaded rod (33), then rotate and install the threaded rod (33) inside the connecting groove (22) through the bearing ring, and keep the slider (35) slidingly sleeved inside the connecting groove (22), then rotate and install the moving column (41) on the top surface of the slider (35) through the bearing ring, then weld the ring gear (44) to the bottom end of the outer surface of the moving column (41), then weld the rack (45) to the top surface of the mounting plate (2), and keep the rack (45) and the ring gear (44) meshed, then install the motor (31) in the middle of the right end surface of the mounting plate (2), then install the driving gear (32) on the output end of the motor (31), and keep the driving gear (32) and the driven gear (34) meshed, and finally install the mounting plate (2) inside the fan blade (1). Step three: Covering the front and rear sides of the fan blade (1) with a flexible coating (13) corresponding to the position of the strip-shaped through groove (12). Step 3: When ice forms on the surface of the fan blade (1), the heat-conducting structure inside the fan blade (1) is activated to heat it, and then the side of the ice layer in contact with the fan blade (1) melts, and small ice crystals fall off under the action of the centrifugal force generated when the fan blade (1) rotates. Step 4: If the ice layer is thick, the motor (31) is started to drive the driving gear (32) to rotate, and then the driving gear (32) drives the driven gears (34) and the threaded rod (33) on both sides to rotate, and the threaded rods (33) and the driven gears (34) on both sides rotate in opposite directions, and then the sliders (35) on both sides are driven to move in opposite directions along the connecting groove (22). When the sliders (35) move, the deicing assembly (4) can be driven to move together. When the moving column (41) moves, the ring gear (44) and the rack (45) are meshed, so that the moving column (41) and the extension and contraction of the arc surface thereof can be made. The rod (42) and the de-icing ball (43) rotate on the top surface of the slider (35). When the de-icing ball (43) passes through the strip groove (12), the spring pushes the moving rod (422) and the de-icing ball (43) to move into the strip groove (12). The de-icing ball (43) contacts the flexible coating (13), which can cause the flexible coating (13) to bulge outward, thereby destroying the ice layer structure, causing the ice layer to break and fall off. The de-icing ball (43) also contacts the inner wall of the fan blade (1). During the movement of the de-icing ball (43) along the inner wall of the connecting groove (22), it will intermittently hit the inner wall of the fan blade (1), causing the ice layer to fall off.

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