Internal lifting appliance for cabin of large-scale wind generating set

Abstract

The invention discloses a large-scale wind generating set cabin internal lifting appliance and a using method thereof, and particularly relates to the technical field of wind generating set cabin lifting equipment, the large-scale wind generating set cabin internal lifting appliance comprises a base, a supporting device is arranged on the top wall of an inner cavity of a cabin body, and limiting devices are arranged on the two sides of the outer surface of the supporting device; a hoisting device is arranged under the supporting device. According to the internal lifting appliance for the cabin of the large wind generating set, by arranging the limiting device, after a worker fixes an object needing to be lifted, the steel wire rope is wound by the winding mechanism, after the steel wire rope is tightened, if the lifted object is not located under the supporting device, the limiting mechanism can act, and then the steel wire rope is wound by the winding mechanism; when the steel wire rope needs to be lifted, a worker can move the position of the supporting device to enable the pointer to point to the meso-position scale line again, then the steel wire rope continues to be wound through the winding mechanism, and at the moment, the object needing to be lifted does not shake greatly.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine nacelle hoisting equipment, and in particular to an internal hoisting device of a large wind turbine nacelle. Background Art

[0002] For the sustainable development of human energy, environmental protection, and low-carbon economy, the development of clean energy is imperative. As an important part of clean energy, wind power is green and safe. It has been widely used in China in recent years. The nacelle is the core component of the wind turbine, and various key equipment and control systems are installed in the nacelle. The outline of the nacelle is generally a box-shaped skeleton structure with a resin cover on the outer surface and an opening on the top of the cover that can be opened. Because the nacelle is a core component, it is heavy, generally weighing tens to hundreds of tons. The bottom of the nacelle is a yaw bearing, and the bearing body is provided with a mounting hole. The mounting hole corresponds to the mounting hole on the top of the tower and is fixed by bolts.

[0003] Chinese patent public number CN108502700B discloses a wind turbine nacelle hoist, including an upper hoisting system, an I-shaped hoisting beam hoisted below the upper hoisting system, a front lower hoisting system installed at the lower part of the I-shaped hoisting beam, and a rear lower hoisting system. The upper hoisting system is a double-limb hoisting sling, and the I-shaped hoisting beam is composed of a crossbeam, a first longitudinal beam and a second longitudinal beam fixed at both ends of the crossbeam. The first longitudinal beam and the second longitudinal beam are not of equal length. At least one hoisting hole is provided on the upper hoisting ear and the lower hoisting ear of the I-shaped hoisting beam. The device can adjust the center of gravity of the nacelle in time according to the working conditions and avoid interference between the connecting rigging and the internal equipment of the nacelle. It has good versatility, stability and safety. However, in actual use, the device cannot alleviate the sliding of objects during the hoisting process. At the same time, the device has a single method for fixing the objects to be hoisted, and cannot be used for hoisting of different objects. Summary of the invention

[0004] The main purpose of the present invention is to provide an internal hoist of a large wind turbine nacelle, which can effectively solve the problem that the sliding of objects during the lifting process cannot be alleviated, and at the same time, the method of fixing the objects to be lifted is single and the lifting work of different objects cannot be used.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A large wind turbine generator nacelle internal hoist comprises a base, a nacelle body is arranged on the upper part of the base, a fan blade is arranged on one side of the outer surface of the nacelle body, a supporting device is arranged on the inner cavity top wall of the nacelle body, limiting devices are arranged on both sides of the outer surface of the supporting device, a hoisting device is arranged directly below the supporting device, a winding mechanism is arranged in the middle of the upper end of the supporting device, and the outer surface of the winding mechanism, two limiting devices and the hoisting device are connected by four steel wire ropes;

[0007] The supporting device includes a mounting frame, which is slidably mounted on the top wall of the inner cavity of the cabin body, and transmission components that can drive the mounting frame to slide are arranged on both sides of the upper part of the mounting frame, and telescopic rods are slidably mounted on both sides of the mounting frame, and hydraulic push rods are arranged on both sides of the middle part of the mounting frame, and the protruding ends of the two hydraulic push rods are respectively fixedly connected to the middle parts of the outer surfaces of the two telescopic rods.

[0008] Preferably, the limiting device includes a mounting frame, which is fixedly mounted on a side of the lower end of the telescopic rod away from the mounting frame, a median scale line is provided in the middle of the outer surface of the mounting frame, a mounting hole is provided in the middle of the outer surface of the mounting frame, a limiting mechanism is provided in the middle of the inner cavity of the mounting frame, a pointer is provided on the side of the outer surface of the limiting mechanism close to the median scale line, the pointer extends to the outside of the mounting hole at one end away from the mounting frame, and connecting mechanisms are provided on both sides of the outer surface of the limiting mechanism.

[0009] Preferably, the limiting mechanism includes a support tube, which is fixedly installed in the middle of the inner cavity of the mounting frame, and a connecting tube is sleeved in the middle of the outer surface of the support tube, and the inner cavity of the connecting tube is slidably connected to the outer surface of the support tube, and two hydraulic telescopic rods are provided on both sides of the outer surface of the support tube, and the two hydraulic telescopic rods are fixedly installed on both sides of the outer surface of the mounting frame, and the extension rods of the two hydraulic telescopic rods extend to the interior of the support tube, and tooth plates are provided on both sides of the middle of the inner cavity of the support tube, and the upper ends of the two tooth plates extend to the upper part of the support tube, and a limiting groove is provided in an array in the middle of the upper side of the inner cavity surface of the connecting tube, and the limiting groove is adapted for use with the two tooth plates.

[0010] Preferably, the inner cavity of the support tube and the inner cavity of the second hydraulic telescopic rod are filled with hydraulic oil.

[0011] Preferably, the connecting mechanism includes a limiting wheel, a circular frame is provided on the upper part of the limiting wheel, hydraulic grooves are provided on both sides of the circular frame, a connecting rod is provided in the middle part of the inner cavity of the hydraulic groove, the upper end of the connecting rod extends to the upper part of the circular frame, the upper end of the connecting rod is fixedly connected to the outer surface of the connecting tube, a spring is wound on the lower part of the outer surface of the connecting rod, a connecting block is slidably installed in the middle part of the circular frame, and the upper end of the connecting block is fixedly connected to the outer surface of the connecting tube.

[0012] Preferably, the inner cavities of the hydraulic grooves opened on both sides of the circular frame on one side are filled with hydraulic oil, and the inner cavities of the two hydraulic grooves are connected to the inner cavity of the second hydraulic telescopic rod closest to the circular frame through a hydraulic pipe.

[0013] Preferably, the lifting device includes two limit frames, a fixing mechanism is arranged between the two limit frames, a hook is arranged on both sides of the middle part of the inner cavity of the two limit frames, a limit plate 2 is rotatably installed on both sides of the inner cavity of the two limit frames, four limit plates 2 are matched with four hooks 1 for use, a limit plate 1 is arranged in the middle part of the inner cavity of the two limit frames, and a hook 2 is arranged at the lower end of the two limit frames.

[0014] Preferably, the outer surfaces of the four hooks in the inner cavities of the two limit frames, the four connecting mechanisms in the limit devices on both sides and the winding mechanism are connected by four steel wire ropes.

[0015] Preferably, the fixing mechanism includes a fixing plate 1 and a fixing plate 2, the fixing plate 1 and the fixing plate 2 are respectively fixedly connected to the outer surfaces of the two limit frames, a slide plate is slidably installed on one side of the outer surface of the fixing plate 2, a fixing groove and an L-shaped plate are provided on the outer surface of the fixing plate 1 close to the fixing plate 2, a fixing groove is provided on the outer surface of the fixing plate 2 close to the fixing plate 1, an L-shaped plate is provided on the outer surface of the slide plate, the fixing groove and the L-shaped plate at the upper end of the fixing plate 1 are adapted for use with the fixing groove on the surface of the fixing plate 2 and the L-shaped plate on the surface of the slide plate, fixing pins are provided at the upper and lower ends of the slide plate, the two fixing pins are adapted for use with the fixing plate 2, fixing parts are provided at the middle parts of the lower ends of the fixing plate 1 and the fixing plates 2, and the two fixing parts are adapted for use with the hook 2.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, a limiting device is provided. After the staff has fixed the object to be lifted, the winding mechanism will wind up the wire rope. When the wire rope is tightened, if the object to be lifted is not directly under the supporting device, the limiting mechanism will be actuated. At this time, the staff can move the position of the supporting device so that the pointer points to the middle scale line again, and then continue to wind up the wire rope through the winding mechanism. At this time, the object to be lifted will not shake greatly. At the same time, during the lifting process, the connecting mechanism can limit the connecting mechanism, so as to avoid the phenomenon that when the supporting device moves the object, the limiting mechanism moves, resulting in an increase in the amplitude of the object shaking.

[0018] 2. In the present invention, by providing a lifting device, when lifting different objects, different devices have different lifting methods. By assembling four connecting mechanisms through the installation frame and the limiting mechanism, the lifting device can adapt to the lifting of different objects and increase the reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the assembly of the support device of the present invention;

[0021] Figure 3 The assembly diagram of the winding mechanism, the hoisting device and the limiting device of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 4 The assembly diagram of the winding mechanism, the hoisting device and the limiting device of the present invention is shown in FIG. Figure 2 ;

[0023] Figure 5 It is a schematic diagram of the structure of the support device of the present invention;

[0024] Figure 6 The structure of the limiting device of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 7 The structure of the limiting device of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 8 It is a schematic diagram of the structure of the limiting mechanism of the present invention;

[0027] Fig. 9 It is a schematic diagram of the connection mechanism structure of the present invention;

[0028] Fig.10 For the present invention Fig. 9 A shows a local enlarged view;

[0029] Fig.11 For the present invention Fig. 9 Middle B shows a local enlarged view;

[0030] Fig.12 It is a structural schematic diagram of the hoisting device of the present invention;

[0031] Fig.13 It is a schematic diagram of the fixing mechanism structure of the present invention.

[0032] In the figure: 1. base; 2. cabin body; 3. fan blade; 4. supporting device; 41. mounting frame; 42. telescopic rod 1; 5. limiting device; 51. mounting frame; 52. limiting mechanism; 521. supporting tube; 522. connecting tube; 523. hydraulic telescopic rod 2; 524. tooth plate; 53. connecting mechanism; 531. limiting wheel; 532. circular frame; 533. hydraulic groove; 534. connecting rod; 535. connecting block; 6. winding mechanism; 7. lifting device; 71. limiting frame; 711. limiting plate 1; 72. fixing mechanism; 721. fixing plate 1; 722. fixing groove; 723. fixing plate 2; 724. sliding plate; 725. fixing pin; 726. fixing piece; 727. L-shaped plate; 73. hook 1; 74. limiting plate 2; 75. hook 2. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0034] Embodiment 1, as Figure 1 — Figure 4 As shown, this embodiment discloses an internal hanger of a cabin of a large wind turbine generator set, including a base 1, a cabin body 2 is arranged on the upper part of the base 1, a fan blade 3 is arranged on one side of the outer surface of the cabin body 2, a supporting device 4 is arranged on the top wall of the inner cavity of the cabin body 2, limiting devices 5 are arranged on both sides of the outer surface of the supporting device 4, and a winding mechanism 6 is arranged in the middle part of the upper end of the supporting device 4.

[0035] Specifically, the base 1, the cabin body 2 and the fan blades 3 together constitute a wind turbine, which is a prior art and will not be described in detail in this specification.

[0036] Furthermore, in the daily work of the staff, the staff can control the support device 4 to slide in the inner cavity of the cabin body 2 so as to lift objects at different positions in the inner cavity of different cabin bodies 2. When the corresponding items need to be lifted, after fixing the objects, the staff can reel in the wire rope through the reeling mechanism 6 to lift the objects.

[0037] In order to be able to lift the objects to the corresponding position, such as Figure 5 As shown, the supporting device 4 includes a mounting frame 41, which is slidably mounted on the top wall of the inner cavity of the cabin body 2, and transmission components that can drive the mounting frame 41 to slide are arranged on both sides of the upper part of the mounting frame 41, and telescopic rods 42 are slidably mounted on both sides of the mounting frame 41, and hydraulic push rods are arranged on both sides of the middle part of the mounting frame 41, and the protruding ends of the two hydraulic push rods are respectively fixedly connected to the middle parts of the outer surfaces of the two telescopic rods 42.

[0038] Specifically, when the staff uses the sling, they can not only control the sliding in the inner cavity of the cabin body 2, but also control the extension of the telescopic rods 42 on both sides through multiple hydraulic push rods, so that the support device 4 can not only move the object forward and backward, but also move the object left and right.

[0039] During the lifting process, if the object to be lifted is not directly under the support device 4, the object will shake after the winding mechanism 6 lifts the object. In order to prevent this phenomenon from happening as much as possible, Figure 6 and Figure 7 As shown, the limiting device 5 includes a mounting frame 51, which is fixedly mounted on the side of the lower end of the telescopic rod 42 away from the mounting frame 41, a middle scale line is provided in the middle of the outer surface of the mounting frame 51, a mounting hole is provided in the middle of the outer surface of the mounting frame 51, a limiting mechanism 52 is provided in the middle of the inner cavity of the mounting frame 51, a pointer is provided on the side of the outer surface of the limiting mechanism 52 close to the middle scale line, the pointer extends to the outside of the mounting hole away from the end of the mounting frame 41, and connecting mechanisms 53 are provided on both sides of the outer surface of the limiting mechanism 52.

[0040] Specifically, after the staff has fixed the object to be lifted, the winding mechanism 6 will wind up the wire rope. When the wire rope is tightened, if the object to be lifted is not directly under the supporting device 4, the limiting mechanism 52 will be actuated. At this time, the staff can move the position of the supporting device 4 so that the pointer points to the middle scale line again, and then continue to wind up the wire rope through the winding mechanism 6. At this time, the object to be lifted will not shake significantly.

[0041] Furthermore, when the pointer is made to point to the middle scale line again and the winding mechanism 6 continues to wind the wire rope, the force of the tightening wire rope will become greater and greater until the object is lifted. In this process, the connecting mechanism 53 will be pulled downward by the tightening force of the wire rope, so that the hydraulic oil in the inner cavity of the connecting mechanism 53 enters the inner cavity of the limiting mechanism 52, thereby restricting the limiting mechanism 52. At this time, the limiting mechanism 52 will no longer move, thereby avoiding the phenomenon that when the supporting device 4 moves the object, the limiting mechanism 52 moves, causing the amplitude of the object to increase.

[0042] Before lifting the object to be lifted, try to reduce the inclination angle of the wire rope as much as possible, so as to greatly avoid the angle between the support device 4 and the lifted object, which will cause the object to shake during the lifting process. Figure 8As shown, the limiting mechanism 52 includes a support tube 521, which is fixedly installed in the middle of the inner cavity of the mounting frame 51, and a connecting tube 522 is sleeved in the middle of the outer surface of the support tube 521. The inner cavity of the connecting tube 522 is slidably connected to the outer surface of the support tube 521, and hydraulic telescopic rods 523 are arranged on both sides of the outer surface of the support tube 521. The hydraulic telescopic rods 523 are fixedly installed on both sides of the outer surface of the mounting frame 51, and the extension rods of the hydraulic telescopic rods 523 extend to the inside of the support tube 521, and tooth plates 524 are arranged on both sides of the middle of the inner cavity of the support tube 521. The upper ends of the two tooth plates 524 extend to the upper part of the support tube 521, and limiting grooves are arranged in an array in the middle of the upper side of the inner cavity surface of the connecting tube 522, and the limiting grooves are adapted for use with the two tooth plates 524.

[0043] Furthermore, the inner cavity of the support tube 521 and the inner cavity of the hydraulic telescopic rod 523 are filled with hydraulic oil.

[0044] In order to limit the position of the connecting tube 522 before the object is lifted, Fig. 9 — Fig.11 As shown, the connecting mechanism 53 includes a limiting wheel 531, a circular frame 532 is provided on the upper part of the limiting wheel 531, hydraulic grooves 533 are provided on both sides of the circular frame 532, a connecting rod 534 is provided in the middle of the inner cavity of the hydraulic groove 533, the upper end of the connecting rod 534 extends to the upper part of the circular frame 532, the upper end of the connecting rod 534 is fixedly connected to the outer surface of the connecting cylinder 522, a spring is wound on the lower part of the outer surface of the connecting rod 534, a connecting block 535 is slidably installed in the middle part of the circular frame 532, and the upper end of the connecting block 535 is fixedly connected to the outer surface of the connecting cylinder 522.

[0045] Furthermore, the inner cavities of the hydraulic grooves 533 opened on both sides of the circular frame 532 on one side are filled with hydraulic oil, and the inner cavities of the two hydraulic grooves 533 are connected to the inner cavity of the hydraulic telescopic rod 2 523 closest to the circular frame 532 through a hydraulic pipe.

[0046] Specifically, after the staff has fixed the object to be lifted, the winding mechanism 6 winds up the wire rope for the first time to tighten the wire rope. If the object is not directly below the supporting device 4, the wire rope drives the connecting tube 522 to slide on the outer surface of the supporting tube 521 through the connecting mechanism 53. At this time, the pointer on the surface of the connecting tube 522 no longer points to the center scale line. At this time, the staff can control the supporting device 4 to slide on the top wall of the inner cavity of the cabin body 2 so that the pointer points to the center scale line again. At this time, the staff can wind up the wire rope again through the winding mechanism 6 to make the wire rope lift the object.

[0047] Furthermore, when the winding mechanism 6 winds up the wire rope again, the force of the winding mechanism 6 pulling the wire rope will increase until the object is lifted. During this process, the wire rope will drive the limiting wheel 531 to move downward, and the limiting wheel 531 will also drive the circular frame 532 to move downward. Since the upper end of the connecting rod 534 is fixed to the outer surface of the connecting cylinder 522, at this time, the connecting rod 534 will drive the piston at the lower end of the connecting rod 534 to move upward relative to the circular frame 532, thereby pressing the inner cavity of the hydraulic groove 533 The hydraulic oil is squeezed, so that the hydraulic oil in the inner cavity of the hydraulic groove 533 enters the inner cavity of the hydraulic telescopic rod 2 523 through the hydraulic pipe, so that the hydraulic telescopic rod 2 523 is extended, and the hydraulic telescopic rod 2 523 squeezes the hydraulic oil in the inner cavity of the support cylinder 521, so that the hydraulic oil in the inner cavity of the support cylinder 521 pushes the two tooth plates 524 to move upward, so that the two tooth plates 524 contact the limiting grooves on the inner cavity surface of the connecting cylinder 522, so that the connecting cylinder 522 and the supporting cylinder 521 no longer slide relative to each other.

[0048] Embodiment 2: This embodiment further improves the lifting device 7 based on embodiment 1. As shown in FIG. 1 , a lifting device 7 is arranged directly below the supporting device 4, and the outer surface of the winding mechanism 6, the two limiting devices 5 and the lifting device 7 are connected by four steel ropes.

[0049] In order to make the sling adapt to the lifting of different objects, such as Fig.12 As shown, the lifting device 7 includes two limit frames 71, a fixing mechanism 72 is arranged between the two limit frames 71, hooks 73 are arranged on both sides of the middle part of the inner cavity of the two limit frames 71, limit plates 74 are rotatably installed on both sides of the inner cavity of the two limit frames 71, four limit plates 74 are matched with four hooks 73, limit plates 711 are arranged in the middle part of the inner cavity of the two limit frames 71, and hooks 75 are arranged at the lower ends of the two limit frames 71.

[0050] Furthermore, the outer surfaces of the four hooks 73 in the inner cavities of the two limiting frames 71, the four connecting mechanisms 53 in the limiting devices 5 on both sides, and the winding mechanism 6 are connected by four steel wire ropes.

[0051] Further, such as Fig.13As shown, the fixing mechanism 72 includes a fixing plate 1 721 and a fixing plate 2 723, the fixing plate 1 721 and the fixing plate 2 723 are respectively fixedly connected to the outer surfaces of the two limit frames 71, a sliding plate 724 is slidably mounted on one side of the outer surface of the fixing plate 2 723, a fixing groove 722 and an L-shaped plate 727 are arranged on the outer surface of the fixing plate 1 721 near the side of the fixing plate 2 723, a fixing groove 722 is arranged on the outer surface of the fixing plate 2 723 near the side of the fixing plate 1 721, and a fixing groove 722 is arranged on the outer surface of the sliding plate 724 An L-shaped plate 727 is provided on it, and the fixing groove 722 and the L-shaped plate 727 at the upper end of the fixing plate 1 721 are adapted for use with the fixing groove 722 on the surface of the fixing plate 2 723 and the L-shaped plate 727 on the surface of the slide plate 724. The upper and lower ends of the slide plate 724 are provided with fixing pins 725, and the two fixing pins 725 are adapted for use with the fixing plate 2 723. The middle part of the lower end of the fixing plate 1 721 and the fixing plate 2 723 is provided with fixing parts 726, and the two fixing parts 726 are adapted for use with the hook 2 75.

[0052] Specifically, before lifting the object, the staff needs to hang the hook 1 73 on both sides of the object. When there is only one position to prevent hooking on the surface of both sides of the object, the staff can put the two hooks 1 73 on the same side into the inner cavity of a limit frame 71, and then lift the object through the hook 2 75 at the lower part of the limit frame 71. When the lifting material of the object is above the object, the staff can assemble the two limit frames 71 together through the fixing plate 1 721 and the fixing plate 2 723.

[0053] Furthermore, during the process of assembling the two limit frames 71, the staff inserts the L-shaped plate 727 into the inner cavity of the fixing groove 722. In order to increase the tightness between the two limit frames 71, the two L-shaped plates 727 are inserted into the fixing groove 722 in opposite directions. Therefore, it is necessary to set the L-shaped plate 727 on the other side on the slide plate 724, and then fix the slide plate 724 to the fixing plate 2 723 through the fixing pin 725, so as to increase the tightness of the two limit frames 71 assembled together.

[0054] Furthermore, by assembling four hooks 73 together in pairs or assembling four hooks 73 together, the lifting methods of the lifting device are increased.

[0055] It should be noted that the specific installation method, circuit arrangement and connection method of the base 1, cabin body 2, fan blades 3, support device 4 and winding mechanism 6 used in the above-mentioned embodiment 1 and their control method are all conventional designs in the prior art and will not be elaborated in detail in the present invention.

[0056] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sling inside a nacelle of a large wind turbine generator, comprising a base (1), characterized in that: A cabin body (2) is arranged on the upper part of the base (1), a fan blade (3) is arranged on one side of the outer surface of the cabin body (2), a supporting device (4) is arranged on the top wall of the inner cavity of the cabin body (2), limiting devices (5) are arranged on both sides of the outer surface of the supporting device (4), a lifting device (7) is arranged directly below the supporting device (4), a winding mechanism (6) is arranged in the middle of the upper end of the supporting device (4), and the outer surface of the winding mechanism (6), the two limiting devices (5) and the lifting device (7) are connected by four steel wire ropes; The support device (4) comprises a mounting frame (41), the mounting frame (41) being slidably mounted on the top wall of the inner cavity of the cabin body (2), transmission components capable of driving the mounting frame (41) to slide are arranged on both sides of the upper part of the mounting frame (41), telescopic rods (42) are slidably mounted on both sides of the mounting frame (41), hydraulic push rods are arranged on both sides of the middle part of the mounting frame (41), and the extended ends of the two hydraulic push rods are respectively fixedly connected to the middle parts of the outer surfaces of the two telescopic rods (42).

2. A large wind turbine nacelle internal hanger according to claim 1, characterized in that: The limiting device (5) comprises a mounting frame (51), the mounting frame (51) being fixedly mounted on a side of the lower end of the telescopic rod (42) away from the mounting frame (41), a middle scale line being provided in the middle of the outer surface of the mounting frame (51), a mounting hole being provided in the middle of the outer surface of the mounting frame (51), a limiting mechanism (52) being provided in the middle of the inner cavity of the mounting frame (51), a pointer being provided on a side of the outer surface of the limiting mechanism (52) close to the middle scale line, an end of the pointer away from the mounting frame (41) extending to the outside of the mounting hole, and connecting mechanisms (53) being provided on both sides of the outer surface of the limiting mechanism (52).

3. A large wind turbine nacelle internal hanger according to claim 2, characterized in that: The limiting mechanism (52) comprises a supporting tube (521), wherein the supporting tube (521) is fixedly mounted in the middle of the inner cavity of the mounting frame (51), a connecting tube (522) is sleeved in the middle of the outer surface of the supporting tube (521), the inner cavity of the connecting tube (522) is slidably connected to the outer surface of the supporting tube (521), and two hydraulic telescopic rods (523) are arranged on both sides of the outer surface of the supporting tube (521), and the two hydraulic telescopic rods (523) are fixedly mounted. Installed on both sides of the outer surface of the mounting frame (51), the extension rod of the second hydraulic telescopic rod (523) extends to the inside of the support tube (521), tooth plates (524) are arranged on both sides of the middle part of the inner cavity of the support tube (521), the upper ends of the two tooth plates (524) extend to the upper part of the support tube (521), and the limiting grooves are arranged in an array in the middle part of the upper side of the inner cavity surface of the connecting tube (522), and the limiting grooves are adapted for use with the two tooth plates (524).

4. A large wind turbine nacelle internal hanger according to claim 3, characterized in that: The inner cavity of the support cylinder (521) and the inner cavity of the second hydraulic telescopic rod (523) are filled with hydraulic oil.

5. The internal hanger of a large wind turbine generator nacelle according to claim 3, characterized in that: The connecting mechanism (53) comprises a limiting wheel (531), a circular frame (532) is arranged on the upper part of the limiting wheel (531), hydraulic grooves (533) are arranged on both sides of the circular frame (532), a connecting rod (534) is arranged in the middle of the inner cavity of the hydraulic groove (533), the upper end of the connecting rod (534) extends to the upper part of the circular frame (532), the upper end of the connecting rod (534) is fixedly connected to the outer surface of the connecting tube (522), a spring is wound around the lower part of the outer surface of the connecting rod (534), a connecting block (535) is slidably installed in the middle of the circular frame (532), and the upper end of the connecting block (535) is fixedly connected to the outer surface of the connecting tube (522).

6. A large wind turbine nacelle internal hanging device according to claim 5, characterized in that: The inner cavities of the hydraulic grooves (533) opened on both sides of the circular frame (532) on one side are filled with hydraulic oil, and the inner cavities of the two hydraulic grooves (533) and the inner cavity of the second hydraulic telescopic rod (523) closest to the circular frame (532) are connected through a hydraulic pipe.

7. A large wind turbine nacelle internal hanger according to claim 3, characterized in that: The hoisting device (7) comprises two limit frames (71), a fixing mechanism (72) is arranged between the two limit frames (71), hooks (73) are arranged on both sides of the middle part of the inner cavity of the two limit frames (71), limit plates (74) are rotatably installed on both sides of the inner cavity of the two limit frames (71), four limit plates (74) are matched with four hooks (73) for use, limit plates (711) are arranged in the middle part of the inner cavity of the two limit frames (71), and hooks (75) are arranged at the lower ends of the two limit frames (71).

8. A large wind turbine nacelle internal hanging device according to claim 7, characterized in that: The outer surfaces of the four hooks (73) in the inner cavities of the two limit frames (71), the four connecting mechanisms (53) in the limit devices (5) on both sides, and the winding mechanism (6) are connected via four steel wire ropes.

9. The internal hanger of a large wind turbine generator nacelle according to claim 7, characterized in that: The fixing mechanism (72) comprises a fixing plate 1 (721) and a fixing plate 2 (723), wherein the fixing plate 1 (721) and the fixing plate 2 (723) are respectively fixedly connected to the outer surfaces of the two limit frames (71), a slide plate (724) is slidably mounted on one side of the outer surface of the fixing plate 2 (723), a fixing groove (722) and an L-shaped plate (727) are arranged on the side of the outer surface of the fixing plate 1 (721) close to the fixing plate 2 (723), a fixing groove (722) is arranged on the side of the outer surface of the fixing plate 2 (723) close to the fixing plate 1 (721), and a sliding plate (724) is arranged on the outer surface of the sliding plate (724). An L-shaped plate (727) is provided, the fixing groove (722) and the L-shaped plate (727) at the upper end of the fixing plate 1 (721) are matched with the fixing groove (722) on the surface of the fixing plate 2 (723) and the L-shaped plate (727) on the surface of the slide plate (724), the upper and lower ends of the slide plate (724) are both provided with fixing pins (725), the two fixing pins (725) are matched with the fixing plate 2 (723), the middle parts of the lower ends of the fixing plate 1 (721) and the fixing plate 2 (723) are both provided with fixing pieces (726), the two fixing pieces (726) are matched with the hook 2 (75).

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