A fall prevention tool for internal inspection of wind turbine blades and assembly and use method thereof

Abstract

The present invention provides an anti-falling tool for internal inspection of wind turbine blades and an assembly and use method. The wind turbine blade includes a manhole opened on a rear cover plate. Along the outer peripheral side of the manhole, the rear cover plate is fixedly installed with a fixed support frame in a planar polygonal structure on its inner surface. The anti-falling tool includes a protective frame. The bottom end of the protective frame is rotatably connected to the inside of the fixed support frame through a support rod in a detachable manner. The top end of the protective frame leans against the cavity wall of the wind turbine blade in an inclined manner. Through the anti-falling tool for internal inspection of wind turbine blades and the assembly and use method described in the present invention, the structure of the anti-falling tool is simple and reliable, and the assembly is convenient, which improves the work quality and safety of operation and maintenance personnel entering the interior of the wind turbine blade, and will not affect the normal operation of the wind turbine blade.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade operation and maintenance, and in particular to a fall prevention tool for internal inspection of a wind turbine blade and an assembly and use method thereof. Background Art

[0002] As the number of wind turbines increases year by year, the wind power aftermarket has become a hot spot in the industry. Regular inspection and maintenance of wind turbine components is necessary for the safe operation of wind turbines. Among them, wind turbine blades are located at the top of wind turbines. The inspection and maintenance of their internal structures need to be carried out by operation and maintenance personnel entering the wind turbine blades when the wind turbine is shut down.

[0003] When the wind turbine is shut down, the three wind turbine blades are in a Y-shaped state, two facing the sky and one facing the ground. If there are no protective measures inside the wind turbine blades, the operation and maintenance personnel are very likely to slip or even fall when entering the inside of the wind turbine blades, or they may not be able to enter the deep inside of the wind turbine blades. Summary of the invention

[0004] In view of this, the technical problem to be solved by the present invention is: the first aspect is to provide a fall prevention tool for internal inspection of wind turbine blades, which has a simple and reliable structure and is easy to assemble, thereby improving the work quality and safety of operation and maintenance personnel entering the interior of the wind turbine blades, and will not affect the normal operation of the wind turbine blades.

[0005] In order to solve the technical problem of the first aspect mentioned above, the present invention provides an anti-falling tool for internal inspection of wind turbine blades, the wind turbine blade comprising a manhole opened on a rear cover plate, along the outer peripheral side of the manhole, the rear cover plate is fixedly installed with a fixed support frame with a planar polygonal structure on its inner surface, the anti-falling tool comprises a protective frame, the bottom end of the protective frame is rotatably connected to the inside of the fixed support frame through a support rod in a detachable manner, and the top end of the protective frame is inclined against the cavity wall of the wind turbine blade.

[0006] Preferably, the detachable rotating connection includes the following two installation methods:

[0007] 1) The support rod is rotatably connected to the interior of the fixed support frame, and the bottom end of the protective frame is fixedly connected to the support rod, wherein at least one of the rotatable connection and the fixed connection is detachable;

[0008] 2) The support rod is fixedly connected to the inside of the fixed support frame, and the bottom end of the protective frame is rotatably connected to the support rod, wherein at least one of the rotatable connection and the fixed connection is detachable.

[0009] Preferably, the support rod is a telescopic metal rod and is detachably connected to the interior of the fixed support frame.

[0010] Preferably, the protective frame is at least a telescopic protective frame, or it also includes a transverse support frame and a foldable height support frame.

[0011] Preferably, the fixed support frame comprises at least three fixing rods, and both ends of any one of the fixing rods are inserted and fixed in fixing buckles, and the fixing buckles are fixedly arranged in a distributed manner on the inner surface of the rear cover plate.

[0012] Preferably, there are two manholes, and the fixed support frame is a planar quadrilateral structure formed by splicing two planar triangles, and is fixedly mounted on the inner surface of the rear cover plate only by four fixing buckles.

[0013] Preferably, the four fixing buckles are fixedly distributed on the outer edge of the inner surface of the rear cover plate in a circularly equally divided manner.

[0014] Preferably, the fixing buckle includes a buckle base, which is a rectangular metal block with a buckle stud welded on its lower end face, side holes on its two side surfaces, and a forward hole on its front surface, and the side holes and the forward hole are both used for plugging and fixing the fixing rod.

[0015] Preferably, any one of the fixing rods is provided with at least a plurality of first lateral grooves for connecting the support rod to the inside of the fixed support frame, and at least one of the fixing rods is also provided with a plurality of second lateral grooves in the opposite direction to the first lateral grooves.

[0016] The technical problem to be solved by the present invention is also: the second aspect proposes an assembly and use method of a fall-prevention tool for internal inspection of wind turbine blades, which has a simple and reliable structure and is easy to assemble, thereby improving the work quality and safety of operation and maintenance personnel entering the interior of wind turbine blades, and will not affect the normal operation of the wind turbine blades.

[0017] In order to solve the technical problem in the second aspect, the present invention proposes an assembly and use method of a fall prevention tool for internal inspection of a wind turbine blade, using the fall prevention tool described in any embodiment of the first aspect, and the assembly and use method comprises the following steps:

[0018] S1: The wind turbine is shut down, and the operation and maintenance personnel enter the wind turbine blade through the manhole, carrying at least a support rod and a protective frame, or also a fixing rod;

[0019] S2: Ensure that the fixed support frame with a planar polygonal structure is fixedly installed on the inner surface of the rear cover along the outer peripheral side of the manhole;

[0020] S3: Connecting both ends of the support rod to any position inside the fixed support frame, and connecting the bottom end of the transverse support frame to the support rod, so that the bottom end of the protective frame is rotatably connected to the inside of the fixed support frame through the support rod;

[0021] S4: Pull the lateral support frame to unfold the height support frame, and make the top of the protection frame lean against the cavity wall of the wind turbine blade;

[0022] S5: The operation and maintenance personnel climb on the horizontal support frame to go deep into the wind turbine blades for inspection and maintenance.

[0023] Compared with the prior art, the anti-fall tooling and assembly method for internal inspection of wind turbine blades described in the present invention have the following beneficial effects:

[0024] 1) The structure is simple and reliable and easy to assemble, which improves the operation quality and safety of maintenance personnel entering the wind turbine blades without affecting the normal operation of the wind turbine blades;

[0025] 2) The installation position of the support rod inside the fixed support frame is arbitrarily adjustable, so that the top of the protective frame can be tilted against any position of the cavity wall of the wind turbine blade;

[0026] 3) For any one of the leading edge side cavity and the trailing edge side cavity, safety inspection and maintenance can be performed while further simplifying the overall structure of the anti-fall tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of a shutdown structure of a wind turbine generator set described in a specific implementation manner of the present invention;

[0029] Figure 2 A schematic diagram of the external structure of a wind turbine blade according to a specific embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of a first internal structure of a wind turbine blade described in a specific embodiment of the present invention;

[0031] Figure 4 A schematic diagram of a second internal structure of a wind turbine blade according to a specific embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the three-dimensional structure of a fall protection tool described in Example 1 of the present invention;

[0033] Figure 6 This is a schematic diagram of a three-dimensional installation structure of a fixing buckle described in Example 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of a three-dimensional installation structure of a fixing rod described in Example 1 of the present invention;

[0035] Figure 8 This is a schematic diagram of a three-dimensional installation structure of a support rod described in Example 1 of the present invention;

[0036] Fig. 9 This is a schematic diagram of the three-dimensional structure of a protective frame described in Example 1 of the present invention;

[0037] Fig.10 This is a schematic diagram of a three-dimensional installation structure of a protective frame described in Example 1 of the present invention;

[0038] Fig.11 This is a schematic diagram of the three-dimensional structure of a fall prevention tooling in Embodiment 1 of the present invention in a first installation position in a wind turbine blade;

[0039] Fig.12 It is a schematic diagram of the three-dimensional structure of the anti-fall tooling described in Example 1 of the present invention in the second installation position in the wind turbine blade.

[0040] Description of reference numerals:

[0041] 1-fixed support frame, 11-fixed buckle, 110-buckle base, 111-buckle stud, 112-lateral hole, 113-front hole, 12-fixed rod, 121-first lateral groove, 122-second lateral groove, 13-support rod, 14-protective frame, 141-lateral support frame, 142-height support frame, 5-fastener;

[0042] 2-tower, 3-hub, 4-wind turbine blade, 41-root end face, 42-rear cover plate, 43-manhole, 44-root bolts, 45-web, 46-blade suction surface, 47-blade pressure surface, 48-leading edge side cavity, 49-trailing edge side cavity. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purpose, technical scheme and advantages of the present invention clearer and easier to understand, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments of the present invention described herein are only part of the embodiments of the present invention, which are only used to explain the present invention and do not constitute a limitation of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0044] For the convenience of explanation, the internal and external structures of wind turbines and wind turbine blades are briefly described first. Figure 1 As shown, the wind turbine generator set is mainly composed of a tower 2, a hub 3, and wind turbine blades 4. Figure 2 As shown, the root end face 41 of the wind turbine blade 4 is connected to the hub 3 through a root bolt 44. The rear cover plate 42 is located about 1m behind the root end face 41. The rear cover plate 42 has one or two manholes 43, which are usually Φ600mm in size, for people to enter and exit the interior of the wind turbine blade 4. Figure 3-4 As shown, inside the wind turbine blade 4, along the length direction of the blade from the root to the tip of the blade, one side of the web 45 is glued to the blade pressure surface 47, and the other side is glued to the blade suction surface 46, thereby dividing the wind turbine blade 4 into a leading edge side cavity 48 and a trailing edge side cavity 49.

[0045] Example 1

[0046] See also Figure 5-12 As shown, the present invention provides an anti-falling tool for internal inspection of wind turbine blades, the wind turbine blade 4 includes a manhole 43 opened on a rear cover plate 42, along the outer peripheral side of the manhole 43, the rear cover plate 42 is fixedly installed with a fixed support frame 1 with a planar polygonal structure on its inner surface, the anti-falling tool includes a protective frame 14, the bottom end of the protective frame 14 is rotatably connected to the inside of the fixed support frame 1 through a support rod 13 in a detachable manner, and the top end of the protective frame 14 is inclined against the cavity wall of the wind turbine blade 4.

[0047] Specifically, the fixed support frame 1 is a planar polygonal structure, so its weight will be relatively light. Even if it is fixedly installed on the inner surface of the rear cover plate 42 all year round, it will not affect the normal operation of the wind turbine blades 4. At the same time, the bottom end of the protective frame 14 is rotatably connected to the inside of the fixed support frame 1 through the support rod 13 in a detachable manner, and the following two installation methods can be included:

[0048] 1) The support rod 13 is rotatably connected to the interior of the fixed support frame 1, and the bottom end of the protective frame 14 is fixedly connected to the support rod 13, wherein at least one of the rotatable connection and the fixed connection is detachable;

[0049] 2) The support rod 13 is fixedly connected to the interior of the fixed support frame 1, and the bottom end of the protective frame 14 is rotatably connected to the support rod 13, wherein at least one of the rotatable connection and the fixed connection is detachable.

[0050] Furthermore, at least the protective frame 14 will only be delivered to the rear cover plate 42 through the manhole 43 during the shutdown of the wind turbine set, so as to temporarily assemble the anti-fall tooling inside the wind turbine blade 4. During the temporary assembly process, the protective frame 14 can first be placed flat on the inner surface of the rear cover plate 42, and after the bottom end of the protective frame 14 forms a firm rotation connection with the fixed support frame 1 through the support rod 13, the top end of the protective frame 14 is tilted against the cavity wall of the wind turbine blade to facilitate the smooth temporary assembly. When the temporary assembly is completed, the operation and maintenance personnel can climb on the protective frame 14 to freely enter and exit the deep inside of the wind turbine blade 4, and compared with the zero protection method of directly erecting the protective frame 14 on the inner surface of the rear cover plate 42, there is no need to worry about the risk of the protective frame 14 slipping, especially the risk of slipping to the vicinity of the manhole 43 and then falling from a high altitude.

[0051] Therefore, the anti-fall tooling for internal inspection of wind turbine blades of the present invention has a simple and reliable structure and is easy to assemble, which improves the work quality and safety of maintenance personnel entering the interior of wind turbine blades, and does not affect the normal operation of wind turbine blades. Among them, since the fixed support frame 1 is fixedly installed on the outer peripheral side of the manhole 43, during the shutdown of the wind turbine set, maintenance personnel and the protective frame 14, and even the support rod 13, can easily enter and exit through the manhole 43.

[0052] Of course, it should be understood that Figure 1-4 The internal and external structures of the wind turbine set and wind turbine blades shown are highly universal, and the anti-fall tooling for internal inspection of wind turbine blades described in the present invention has a simple and reliable structure and is easy to install, and can be universally applied to any type of wind turbine blade in the field of wind turbine sets.

[0053] Preferably, the support rod 13 is a telescopic metal rod and is detachably connected to the interior of the fixed support frame 1 .

[0054] Specifically, although the weight of the support rod 13 is also relatively light, it is recommended that the support rod 13 be connected to the interior of the fixed support frame 1 in a detachable manner, whether it is a rotating connection or a fixed connection, so as to further strengthen the protection of the normal operation of the wind turbine blade 4. At the same time, when the support rod 13 is a telescopic metal rod, the support rod 13 only needs to have one model, which can greatly improve the installation freedom of the support rod 13 connected to the interior of the fixed support frame 1, that is, the installation position of the support rod 13 inside the fixed support frame 1 is arbitrarily adjustable, thereby facilitating the top of the protective frame 14 to lean against any position of the cavity wall of the wind turbine blade 4 in an inclined manner. Among them, the effective installation length of the support rod 13 inside the fixed support frame 1 can be greater than the diameter of the manhole 43, or less than the diameter of the manhole 43. Specifically, the telescopic length of the telescopic metal rod can be adjusted as needed, so that the support rod 13 can be connected to the interior of the fixed support frame 1 in a flexible and arbitrarily adjustable manner.

[0055] In addition, when the operation and maintenance personnel climb on the protective frame 14, the support rod 13 will be subjected to a large supporting force. When the support rod 13 is a telescopic metal rod, it will be conducive to forming a firm rotation connection between the bottom end of the protective frame 14 and the fixed support frame 1.

[0056] Preferably, the protection frame 14 is at least a telescopic protection frame, or it further includes a transverse support frame 141 and a foldable height support frame 142 .

[0057] Specifically, the protective frame 14 is usually heavy and needs to have a certain climbing height. When the protective frame 14 is a telescopic protective frame, on the basis of meeting its climbing height, it is conducive to the smooth entry and exit of the protective frame 14 through the manhole 43.

[0058] Furthermore, the transverse support frame 141 is used for maintenance personnel to climb on it, and the foldable height support frame 142 can meet the climbing height requirements and help reduce the volume of the protective frame 14, so that the protective frame 14 can smoothly enter and exit through the manhole 43, while not weakening the support strength of the transverse support frame 141, thereby ensuring the climbing safety of maintenance personnel. Among them, the bottom end of the transverse support frame 141 will be fixedly connected or rotatably connected to the support rod 13, but it is also recommended to be detachable, which will greatly facilitate the connection of the support rod 13 to the inside of the fixed support frame 1 in a flexible and adjustable manner, and then connect the bottom end of the protective frame 14 to the support rod 13.

[0059] Preferably, the fixed support frame 1 includes at least three fixed rods 12 , and both ends of any one of the fixed rods 12 are inserted and fixed in the fixed buckles 11 , and the fixed buckles 11 are distributed and fixedly arranged on the inner surface of the rear cover plate 42 .

[0060] Specifically, the fixed support frame 1 is a planar polygonal structure located on the outer peripheral side of the manhole 43, that is, the fixed support frame 1 must be at least a planar triangular structure. When the fixed support frame 1 includes at least three fixing rods 12, since both ends of any fixing rod 12 are plugged and fixed in the fixing buckle 11, there will be at least three fixing buckles 11, and they are fixedly arranged in a distributed manner on the inner surface of the rear cover plate 42, so that the fixed support frame 1 can be stably installed on the inner surface of the rear cover plate 42. Among them, since both ends of the fixing rod 12 are plugged and fixed in the fixing buckle 11, and in view of the fact that the weight of the fixing buckle 11 is much smaller than the weight of the fixing rod 12, the fixing rod 12 can also be temporarily assembled in a detachable manner when necessary, so as to further strengthen the protection of the normal operation of the wind turbine blade 4.

[0061] Preferably, there are two manholes 43 , and the fixed support frame 1 is a planar quadrilateral structure formed by splicing two planar triangles, and is fixedly mounted on the inner surface of the rear cover plate 42 only by the four fixing buckles 11 .

[0062] Specifically, for most wind turbine blades 4, there are usually two manholes 43, which correspond to the leading edge side cavity 48 and the trailing edge side cavity 49 of the wind turbine blade 4. In the fixed support frame 1, two plane triangles can be selected to correspond to two manholes 43. Among them, the two plane triangles can share a fixing rod 12, and then the plane quadrilateral structure presented by the fixed support frame 1 only needs five fixing rods 12, and the five fixing rods 12 only need to correspond to four fixing buckles 11, and two fixing buckles 11 also need to be in a shared state.

[0063] As one of the preferred examples of the present invention, the four fixing buckles 11 are fixedly distributed on the outer edge of the inner surface of the rear cover plate 42 in a circumferentially equally divided manner.

[0064] Preferably, the fixing buckle 11 includes a buckle base 110, which is a rectangular metal block and has a buckle stud 111 welded on its lower end face, lateral holes 112 on its two side surfaces, and a forward hole 113 on its front surface, and the lateral holes 112 and the forward hole 113 are both used for plugging and fixing the fixing rod 12.

[0065] Specifically, the buckle stud 111 can pass from the inner surface of the rear cover plate 42 to the outer surface of the rear cover plate 42, and be fastened with a fastener 5 at the outer surface of the rear cover plate 42, wherein the fastener 5 can be, for example, a hexagonal nut and a washer, so as to fix the fixing buckle 11 on the inner surface of the rear cover plate 42. The two ends of four of the five fixing rods 12 can be only inserted and fixed in the corresponding two lateral holes 112, while the two ends of the fixing rod 12 shared by the two plane triangles can only be inserted and fixed in the corresponding two forward holes 113.

[0066] Preferably, any one of the fixing rods 12 is provided with at least a plurality of first lateral grooves 121 for connecting the support rod 13 to the inside of the fixed support frame 1, and at least one of the fixing rods 12 is also provided with a plurality of second lateral grooves 122 in the opposite direction to the first lateral grooves 121.

[0067] Specifically, since the support rod 13 is a telescopic metal rod, for any planar triangle on the fixed support frame 1, the support rod 13 can be connected to the inside of the fixed support frame 1 through any two first lateral grooves 121 on different fixed rods 12, thereby satisfying any adjustable connection of the support rod 13 inside the fixed support frame 1.

[0068] As for the planar quadrilateral structure formed by two planar triangles, a plurality of first lateral grooves 121 and second lateral grooves 122 in opposite directions need to be distributed on the common fixed rod 12, so as to take into account any adjustable connection of the support rod 13 inside any planar triangle, so that for any one of the leading edge side cavity 48 and the trailing edge side cavity 49, safety inspection and maintenance can be carried out, and the overall structure of the anti-fall tooling can be further simplified.

[0069] Of course, those skilled in the art may understand that the first lateral groove 121 and the second lateral groove 122 are only relative to the same fixing rod 12 , and in fact any planar triangle on the fixing support frame 1 may be regarded as the first lateral groove 121 .

[0070] Example 2

[0071] See also Figure 5-12 As shown, the present invention also proposes an assembly and use method of a fall prevention tool for internal inspection of a wind turbine blade, using the fall prevention tool described in any embodiment of the first aspect, the assembly and use method comprises the following steps:

[0072] S1: The wind turbine is shut down, and the operation and maintenance personnel enter the wind turbine blade 4 through the manhole 43, carrying at least the support rod 13 and the protection frame 14, or also carrying the fixing rod 12;

[0073] S2: Ensure that the fixed support frame 1 with a planar polygonal structure is fixedly installed on the inner surface of the rear cover plate 42 along the outer peripheral side of the manhole 43;

[0074] S3: Connect both ends of the support rod 13 to any position inside the fixed support frame 1, and connect the bottom end of the transverse support frame 141 to the support rod 13, so that the bottom end of the protective frame 14 is rotatably connected to the inside of the fixed support frame 1 through the support rod 13;

[0075] S4: Pull the horizontal support frame 141 to unfold the height support frame 142, and make the top of the protection frame 14 lean against the cavity wall of the wind turbine blade 4;

[0076] S5: The operation and maintenance personnel climb on the transverse support frame 141 to go deep into the wind turbine blade 4 for inspection and maintenance.

[0077] Preferably, when there are two manholes 43, step S2 includes the following specific steps:

[0078] S21: The four fixing rods 12 are connected end to end through the four snap bases 110, and the fifth fixing rod 12 is connected between the positive holes 113 of two opposite snap bases 110 below the web 45 to form a fixed support frame 1;

[0079] S22: Ensure that the fixed support frame 1 is fixedly installed on the inner surface of the rear cover plate 42 along the outer peripheral sides of the two manholes 43 at the same time.

[0080] As one of the preferred embodiments of the present invention, corresponding to any plane triangle on the fixed support frame 1, step S3 includes the following specific steps:

[0081] S31: Both ends of the support rod 13 pass through the first lateral grooves 121 of any two fixing rods 12 and are rotatably connected to any position inside the fixed support frame 1;

[0082] S32: The bottom end of the transverse support frame 141 is fixedly connected to the support rod 13, so that the bottom end of the protective frame 14 is rotatably connected to the inside of the fixed support frame 1 through the support rod 13.

[0083] As another preferred embodiment of the present invention, corresponding to any plane triangle on the fixed support frame 1, step S3 includes the following specific steps:

[0084] S33: Both ends of the support rod 13 are fixedly connected to any position inside the fixed support frame 1 through the first lateral grooves 121 of any two fixing rods 12;

[0085] S34: The bottom end of the transverse support frame 141 is rotatably connected to the support rod 13 , so that the bottom end of the protective frame 14 is rotatably connected to the inside of the fixed support frame 1 through the support rod 13 .

[0086] Specifically, those skilled in the art can understand that the assembly and use method of the anti-fall tooling for internal inspection of wind turbine blades proposed in Example 2, when it has the anti-fall tooling described in Example 1, the solutions to the corresponding technical problems and the achievement of its technical effects can all be found in the description of the anti-fall tooling in Example 1, and will not be repeated here one by one.

[0087] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A fall prevention tool for internal inspection of wind turbine blades, characterized in that: The wind turbine blade (4) comprises a manhole (43) opened on a rear cover plate (42); a fixed support frame (1) is fixedly installed on the inner surface of the rear cover plate (42) along the outer peripheral side of the manhole (43); the anti-fall tooling comprises a protective frame (14); the bottom end of the protective frame (14) is rotatably connected to the inside of the fixed support frame (1) through a support rod (13) in a detachable manner; the top end of the protective frame (14) leans against the cavity wall of the wind turbine blade (4) in an inclined manner; the fixed support frame (1) comprises at least three fixing rods (12); both ends of any one of the fixing rods (12) are plugged and fixed in a fixing buckle (11); the fixing buckle (11) is fixedly arranged in a distributed manner on the inner surface of the rear cover plate (42); there are two manholes (43); the fixed support frame (1) is composed of two plane triangles spliced ​​together. The fixing buckle (11) is a planar quadrilateral structure and is fixedly mounted on the inner surface of the rear cover plate (42) only by means of four fixing buckles (11); the fixing buckle (11) comprises a buckle base (110), the buckle base (110) is a rectangular metal block and has a buckle stud (111) welded on its lower end surface, lateral holes (112) are provided on both side surfaces, and a forward hole (113) is provided on its front surface, the lateral holes (112) and the forward hole (113) are both used for plugging and fixing the fixing rod (12); any one of the fixing rods (12) is provided with a plurality of first lateral grooves (121) for connecting the support rod (13) to the inside of the fixing support frame (1), and at least one of the fixing rods (12) is also provided with a plurality of second lateral grooves (122) in the opposite direction to the first lateral grooves (121).

2. The anti-fall tool for internal inspection of wind turbine blades according to claim 1, characterized in that: The detachable rotating connection includes the following two installation methods: 1) The support rod (13) is rotatably connected to the interior of the fixed support frame (1), and the bottom end of the protective frame (14) is fixedly connected to the support rod (13), wherein at least one of the rotatable connection and the fixed connection is detachable; 2) The support rod (13) is fixedly connected to the inside of the fixed support frame (1), and the bottom end of the protective frame (14) is rotatably connected to the support rod (13), wherein at least one of the rotatable connection and the fixed connection is detachable.

3. The anti-fall tool for internal inspection of wind turbine blades according to claim 1, characterized in that: The support rod (13) is a telescopic metal rod and is detachably connected to the interior of the fixed support frame (1).

4. The anti-fall tool for internal inspection of wind turbine blades according to claim 1, characterized in that: The protection frame (14) is at least a telescopic protection frame, or it further comprises a transverse support frame (141) and a foldable height support frame (142).

5. The anti-fall tool for internal inspection of wind turbine blades according to claim 1, characterized in that: The four fixing buckles (11) are fixedly distributed on the outer edge of the inner surface of the rear cover plate (42) in a circularly equally divided manner.

6. A method for assembling and using a fall prevention tool for internal inspection of a wind turbine blade, characterized in that: Using the anti-fall tooling as described in any one of claims 1 to 5, the assembly and use method comprises the following steps: S1: The wind turbine is shut down, and the operation and maintenance personnel enter the interior of the wind turbine blade (4) through the manhole (43) carrying at least the support rod (13) and the protection frame (14), or also carrying the fixing rod (12); S2: ensuring that the fixed support frame (1) having a planar polygonal structure is fixedly mounted on the inner surface of the rear cover plate (42) along the outer peripheral side of the manhole (43); S3: Connecting both ends of the support rod (13) to any position inside the fixed support frame (1), and connecting the bottom end of the transverse support frame (141) to the support rod (13), so that the bottom end of the protective frame (14) is rotatably connected to the inside of the fixed support frame (1) through the support rod (13); S4: pulling the horizontal support frame (141) to unfold the height support frame (142), and making the top end of the protection frame (14) lean against the cavity wall of the wind turbine blade (4); S5: The operation and maintenance personnel climb on the transverse support frame (141) to penetrate into the interior of the wind turbine blade (4) for inspection and maintenance.

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